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Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Jonathan Cameron847ec802009-08-18 18:06:19 +01002/* The industrial I/O core
3 *
4 * Copyright (c) 2008 Jonathan Cameron
5 *
Jonathan Cameron847ec802009-08-18 18:06:19 +01006 * Based on elements of hwmon and input subsystems.
7 */
8
Sachin Kamat3176dd52013-10-24 12:53:00 +01009#define pr_fmt(fmt) "iio-core: " fmt
10
Jonathan Cameron847ec802009-08-18 18:06:19 +010011#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/idr.h>
14#include <linux/kdev_t.h>
15#include <linux/err.h>
16#include <linux/device.h>
17#include <linux/fs.h>
Jonathan Cameron847ec802009-08-18 18:06:19 +010018#include <linux/poll.h>
Andy Shevchenkofb158972019-02-21 18:02:46 +010019#include <linux/property.h>
Jonathan Cameronffc18af2009-10-12 19:18:09 +010020#include <linux/sched.h>
Jeff Mahoney4439c932009-10-12 17:10:34 -040021#include <linux/wait.h>
Jonathan Cameron847ec802009-08-18 18:06:19 +010022#include <linux/cdev.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Jonathan Cameron8e7d9672011-08-30 12:32:45 +010024#include <linux/anon_inodes.h>
Michael Henneriche553f182012-03-01 10:51:03 +010025#include <linux/debugfs.h>
Alison Schofield08a33802016-03-09 11:30:12 -080026#include <linux/mutex.h>
Jonathan Cameron06458e22012-04-25 15:54:58 +010027#include <linux/iio/iio.h>
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +030028#include <linux/iio/iio-opaque.h>
Jonathan Camerondf9c1c42011-08-12 17:56:03 +010029#include "iio_core.h"
Jonathan Cameron6aea1c32011-08-24 17:28:38 +010030#include "iio_core_trigger.h"
Jonathan Cameron06458e22012-04-25 15:54:58 +010031#include <linux/iio/sysfs.h>
32#include <linux/iio/events.h>
Lars-Peter Clausen9e69c932013-10-04 12:06:00 +010033#include <linux/iio/buffer.h>
Jonathan Cameron33dd94c2017-01-02 19:28:34 +000034#include <linux/iio/buffer_impl.h>
Jonathan Cameron9dd1cb32011-08-30 12:41:15 +010035
Peter Meerwald99698b42012-08-26 13:43:00 +010036/* IDA to assign each registered device a unique id */
Jonathan Cameronb156cf72010-09-04 17:54:43 +010037static DEFINE_IDA(iio_ida);
Jonathan Cameron847ec802009-08-18 18:06:19 +010038
Jonathan Cameronf625cb92011-08-30 12:32:48 +010039static dev_t iio_devt;
Jonathan Cameron847ec802009-08-18 18:06:19 +010040
41#define IIO_DEV_MAX 256
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +010042struct bus_type iio_bus_type = {
Jonathan Cameron847ec802009-08-18 18:06:19 +010043 .name = "iio",
Jonathan Cameron847ec802009-08-18 18:06:19 +010044};
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +010045EXPORT_SYMBOL(iio_bus_type);
Jonathan Cameron847ec802009-08-18 18:06:19 +010046
Michael Henneriche553f182012-03-01 10:51:03 +010047static struct dentry *iio_debugfs_dentry;
48
Jonathan Cameronc6fc8062011-09-02 17:14:34 +010049static const char * const iio_direction[] = {
50 [0] = "in",
51 [1] = "out",
52};
53
Jonathan Cameronade7ef72011-09-02 17:14:45 +010054static const char * const iio_chan_type_name_spec[] = {
Jonathan Cameronc6fc8062011-09-02 17:14:34 +010055 [IIO_VOLTAGE] = "voltage",
Michael Hennerichfaf290e2011-05-18 14:42:02 +010056 [IIO_CURRENT] = "current",
57 [IIO_POWER] = "power",
Bryan Freed9bff02f2011-07-07 12:01:54 -070058 [IIO_ACCEL] = "accel",
Jonathan Cameron41ea0402011-10-05 15:27:59 +010059 [IIO_ANGL_VEL] = "anglvel",
Jonathan Cameron1d892712011-05-18 14:40:51 +010060 [IIO_MAGN] = "magn",
Bryan Freed9bff02f2011-07-07 12:01:54 -070061 [IIO_LIGHT] = "illuminance",
62 [IIO_INTENSITY] = "intensity",
Bryan Freedf09f2c82011-07-07 12:01:55 -070063 [IIO_PROXIMITY] = "proximity",
Bryan Freed9bff02f2011-07-07 12:01:54 -070064 [IIO_TEMP] = "temp",
Jonathan Cameron1d892712011-05-18 14:40:51 +010065 [IIO_INCLI] = "incli",
66 [IIO_ROT] = "rot",
Jonathan Cameron1d892712011-05-18 14:40:51 +010067 [IIO_ANGL] = "angl",
Bryan Freed9bff02f2011-07-07 12:01:54 -070068 [IIO_TIMESTAMP] = "timestamp",
Jonathan Cameron66dbe702011-09-02 17:14:43 +010069 [IIO_CAPACITANCE] = "capacitance",
Michael Hennericha6b12852012-04-27 10:58:34 +020070 [IIO_ALTVOLTAGE] = "altvoltage",
Jon Brenner21cd1fa2012-05-16 10:46:42 -050071 [IIO_CCT] = "cct",
Lars-Peter Clausenc4f0c692012-11-20 13:36:00 +000072 [IIO_PRESSURE] = "pressure",
Harald Geyerac216aa2013-12-01 15:08:00 +000073 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
Daniel Baluta55aebeb2014-11-10 14:45:30 +020074 [IIO_ACTIVITY] = "activity",
Irina Tirdeaa88bfe72014-11-10 14:45:32 +020075 [IIO_STEPS] = "steps",
Irina Tirdea72c66642015-01-11 21:10:07 +020076 [IIO_ENERGY] = "energy",
Irina Tirdeacc3c9ee2015-01-11 21:10:08 +020077 [IIO_DISTANCE] = "distance",
Irina Tirdea5a1a9322015-01-11 21:10:09 +020078 [IIO_VELOCITY] = "velocity",
Matt Ranostay8ff6b3b2015-09-13 20:26:11 -070079 [IIO_CONCENTRATION] = "concentration",
Matt Ranostayd38d5462015-09-13 20:26:12 -070080 [IIO_RESISTANCE] = "resistance",
Matt Ranostayecb3a7c2016-01-26 18:34:30 -080081 [IIO_PH] = "ph",
Peter Meerwald-Stadlerd4094042016-03-20 16:20:23 +010082 [IIO_UVINDEX] = "uvindex",
Matt Ranostay4b9d2092016-05-24 21:29:19 -070083 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
William Breathitt Gray1a8f3242016-09-28 13:59:49 -040084 [IIO_COUNT] = "count",
85 [IIO_INDEX] = "index",
Song Hongyan571299d2017-01-05 18:24:03 +080086 [IIO_GRAVITY] = "gravity",
Eugen Hristev3055a6c2018-05-22 10:52:32 +030087 [IIO_POSITIONRELATIVE] = "positionrelative",
Mathieu Othacehec73314e2018-07-20 19:34:25 +020088 [IIO_PHASE] = "phase",
Tomasz Duszynski17abc9e2018-12-14 19:28:01 +010089 [IIO_MASSCONCENTRATION] = "massconcentration",
Jonathan Cameron1d892712011-05-18 14:40:51 +010090};
91
Jonathan Cameron330c6c52011-09-02 17:14:39 +010092static const char * const iio_modifier_names[] = {
Jonathan Cameron1d892712011-05-18 14:40:51 +010093 [IIO_MOD_X] = "x",
94 [IIO_MOD_Y] = "y",
95 [IIO_MOD_Z] = "z",
Peter Meerwald4b8d8012015-06-20 23:52:30 +020096 [IIO_MOD_X_AND_Y] = "x&y",
97 [IIO_MOD_X_AND_Z] = "x&z",
98 [IIO_MOD_Y_AND_Z] = "y&z",
99 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
100 [IIO_MOD_X_OR_Y] = "x|y",
101 [IIO_MOD_X_OR_Z] = "x|z",
102 [IIO_MOD_Y_OR_Z] = "y|z",
103 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
Jonathan Cameron8f5879b2012-05-05 10:39:22 +0100104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
Jonathan Cameroncf82cb82012-05-05 10:56:41 +0100105 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
Jonathan Cameron330c6c52011-09-02 17:14:39 +0100106 [IIO_MOD_LIGHT_BOTH] = "both",
107 [IIO_MOD_LIGHT_IR] = "ir",
Jon Brenner21cd1fa2012-05-16 10:46:42 -0500108 [IIO_MOD_LIGHT_CLEAR] = "clear",
109 [IIO_MOD_LIGHT_RED] = "red",
110 [IIO_MOD_LIGHT_GREEN] = "green",
111 [IIO_MOD_LIGHT_BLUE] = "blue",
Peter Meerwald-Stadler2c5ff1f2016-03-20 16:20:22 +0100112 [IIO_MOD_LIGHT_UV] = "uv",
Maxime Roussin-Bélangerc0e4e0f2018-07-19 16:26:24 -0400113 [IIO_MOD_LIGHT_DUV] = "duv",
Srinivas Pandruvada5082f402014-04-29 00:51:00 +0100114 [IIO_MOD_QUATERNION] = "quaternion",
Peter Meerwald638b43b2014-02-05 16:57:00 +0000115 [IIO_MOD_TEMP_AMBIENT] = "ambient",
116 [IIO_MOD_TEMP_OBJECT] = "object",
Reyad Attiyat11b8dda2014-07-17 19:18:00 +0100117 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
118 [IIO_MOD_NORTH_TRUE] = "from_north_true",
119 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
120 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
Daniel Baluta55aebeb2014-11-10 14:45:30 +0200121 [IIO_MOD_RUNNING] = "running",
122 [IIO_MOD_JOGGING] = "jogging",
123 [IIO_MOD_WALKING] = "walking",
124 [IIO_MOD_STILL] = "still",
Irina Tirdea5a1a9322015-01-11 21:10:09 +0200125 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
Lars-Peter Clausen1ce87f22015-05-22 18:17:38 +0200126 [IIO_MOD_I] = "i",
127 [IIO_MOD_Q] = "q",
Matt Ranostay8ff6b3b2015-09-13 20:26:11 -0700128 [IIO_MOD_CO2] = "co2",
129 [IIO_MOD_VOC] = "voc",
Tomasz Duszynski17abc9e2018-12-14 19:28:01 +0100130 [IIO_MOD_PM1] = "pm1",
131 [IIO_MOD_PM2P5] = "pm2p5",
132 [IIO_MOD_PM4] = "pm4",
133 [IIO_MOD_PM10] = "pm10",
Matt Ranostay25f02d32020-06-09 06:01:16 +0300134 [IIO_MOD_ETHANOL] = "ethanol",
135 [IIO_MOD_H2] = "h2",
Matt Ranostay4ffa22f2020-07-23 09:29:43 +0300136 [IIO_MOD_O2] = "o2",
Jonathan Cameron1d892712011-05-18 14:40:51 +0100137};
138
139/* relies on pairs of these shared then separate */
140static const char * const iio_chan_info_postfix[] = {
Jonathan Cameron75a973c2012-04-15 17:41:30 +0100141 [IIO_CHAN_INFO_RAW] = "raw",
142 [IIO_CHAN_INFO_PROCESSED] = "input",
Jonathan Cameronc8a9f802011-10-26 17:41:36 +0100143 [IIO_CHAN_INFO_SCALE] = "scale",
144 [IIO_CHAN_INFO_OFFSET] = "offset",
145 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
146 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
147 [IIO_CHAN_INFO_PEAK] = "peak_raw",
148 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
149 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
150 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
Jonathan Camerondf94aba2011-11-27 11:39:12 +0000151 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
152 = "filter_low_pass_3db_frequency",
Martin Fuzzey3f7f6422015-05-13 12:26:42 +0200153 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
154 = "filter_high_pass_3db_frequency",
Laxman Dewangance85a1c2012-04-13 16:03:31 +0530155 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
Michael Hennericha6b12852012-04-27 10:58:34 +0200156 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
157 [IIO_CHAN_INFO_PHASE] = "phase",
Michael Hennerichb65d6212012-05-11 11:36:53 +0200158 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
srinivas pandruvada7c9ab032012-09-05 13:56:00 +0100159 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
Ye Xiang1c71a282021-02-07 15:00:46 +0800160 [IIO_CHAN_INFO_HYSTERESIS_RELATIVE] = "hysteresis_relative",
Peter Meerwald899d90b2013-09-08 16:20:00 +0100161 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
Irina Tirdeaa88bfe72014-11-10 14:45:32 +0200162 [IIO_CHAN_INFO_ENABLE] = "en",
Irina Tirdeabcdf28f2014-11-10 14:45:33 +0200163 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
Irina Tirdead37f6832015-01-11 21:10:10 +0200164 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
Irina Tirdea2f0ecb72015-01-27 20:41:52 +0200165 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
166 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
Vianney le Clément de Saint-Marcqc8a85852015-03-30 10:34:58 +0200167 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
Irina Tirdeafaaa4492015-04-29 21:16:39 +0300168 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
Andrea Merelloddfb97d2019-11-20 15:47:52 +0100169 [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
Crt Moridde8cee2020-09-06 23:02:31 +0200170 [IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient",
Jonathan Cameron1d892712011-05-18 14:40:51 +0100171};
Jonathan Cameron15ea28782021-04-26 18:49:03 +0100172/**
173 * iio_device_id() - query the unique ID for the device
174 * @indio_dev: Device structure whose ID is being queried
175 *
176 * The IIO device ID is a unique index used for example for the naming
177 * of the character device /dev/iio\:device[ID]
178 */
179int iio_device_id(struct iio_dev *indio_dev)
180{
181 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
182
183 return iio_dev_opaque->id;
184}
185EXPORT_SYMBOL_GPL(iio_device_id);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100186
Lars-Peter Clausend9a0e732021-01-07 13:20:49 +0200187/**
188 * iio_sysfs_match_string_with_gaps - matches given string in an array with gaps
189 * @array: array of strings
190 * @n: number of strings in the array
191 * @str: string to match with
192 *
193 * Returns index of @str in the @array or -EINVAL, similar to match_string().
194 * Uses sysfs_streq instead of strcmp for matching.
195 *
196 * This routine will look for a string in an array of strings.
197 * The search will continue until the element is found or the n-th element
198 * is reached, regardless of any NULL elements in the array.
199 */
200static int iio_sysfs_match_string_with_gaps(const char * const *array, size_t n,
201 const char *str)
202{
203 const char *item;
204 int index;
205
206 for (index = 0; index < n; index++) {
207 item = array[index];
208 if (!item)
209 continue;
210 if (sysfs_streq(item, str))
211 return index;
212 }
213
214 return -EINVAL;
215}
216
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300217#if defined(CONFIG_DEBUG_FS)
Jonathan Cameronc9561fd2020-09-13 14:21:15 +0100218/*
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300219 * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
220 * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined
221 */
222struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
223{
224 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
225 return iio_dev_opaque->debugfs_dentry;
226}
227EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
228#endif
229
Sachin Kamata7e57dc2013-10-29 11:39:00 +0000230/**
231 * iio_find_channel_from_si() - get channel from its scan index
232 * @indio_dev: device
233 * @si: scan index to match
234 */
Jonathan Cameron5fb21c82011-12-05 21:37:10 +0000235const struct iio_chan_spec
236*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
237{
238 int i;
239
240 for (i = 0; i < indio_dev->num_channels; i++)
241 if (indio_dev->channels[i].scan_index == si)
242 return &indio_dev->channels[i];
243 return NULL;
244}
245
Jonathan Cameron847ec802009-08-18 18:06:19 +0100246/* This turns up an awful lot */
247ssize_t iio_read_const_attr(struct device *dev,
248 struct device_attribute *attr,
249 char *buf)
250{
Lars-Peter Clausen83ca56b2021-03-20 08:14:02 +0100251 return sysfs_emit(buf, "%s\n", to_iio_const_attr(attr)->string);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100252}
253EXPORT_SYMBOL(iio_read_const_attr);
254
Gwendal Grignou69f07932020-03-27 15:34:37 -0700255/**
256 * iio_device_set_clock() - Set current timestamping clock for the device
257 * @indio_dev: IIO device structure containing the device
258 * @clock_id: timestamping clock posix identifier to set.
259 */
260int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100261{
262 int ret;
Alexandru Ardeleanfa83c3b2020-06-30 07:57:08 +0300263 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
264 const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100265
266 ret = mutex_lock_interruptible(&indio_dev->mlock);
267 if (ret)
268 return ret;
269 if ((ev_int && iio_event_enabled(ev_int)) ||
270 iio_buffer_enabled(indio_dev)) {
271 mutex_unlock(&indio_dev->mlock);
272 return -EBUSY;
273 }
Jonathan Cameron62a486c42021-04-26 18:49:11 +0100274 iio_dev_opaque->clock_id = clock_id;
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100275 mutex_unlock(&indio_dev->mlock);
276
277 return 0;
278}
Gwendal Grignou69f07932020-03-27 15:34:37 -0700279EXPORT_SYMBOL(iio_device_set_clock);
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100280
281/**
Jonathan Cameron62a486c42021-04-26 18:49:11 +0100282 * iio_device_get_clock() - Retrieve current timestamping clock for the device
283 * @indio_dev: IIO device structure containing the device
284 */
285clockid_t iio_device_get_clock(const struct iio_dev *indio_dev)
286{
287 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
288
289 return iio_dev_opaque->clock_id;
290}
291EXPORT_SYMBOL(iio_device_get_clock);
292
293/**
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100294 * iio_get_time_ns() - utility function to get a time stamp for events etc
295 * @indio_dev: device
296 */
297s64 iio_get_time_ns(const struct iio_dev *indio_dev)
298{
Arnd Bergmann45e7f5d2018-06-18 17:31:36 +0200299 struct timespec64 tp;
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100300
301 switch (iio_device_get_clock(indio_dev)) {
302 case CLOCK_REALTIME:
Arnd Bergmann45e7f5d2018-06-18 17:31:36 +0200303 return ktime_get_real_ns();
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100304 case CLOCK_MONOTONIC:
Arnd Bergmann45e7f5d2018-06-18 17:31:36 +0200305 return ktime_get_ns();
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100306 case CLOCK_MONOTONIC_RAW:
Arnd Bergmann45e7f5d2018-06-18 17:31:36 +0200307 return ktime_get_raw_ns();
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100308 case CLOCK_REALTIME_COARSE:
Arnd Bergmann45e7f5d2018-06-18 17:31:36 +0200309 return ktime_to_ns(ktime_get_coarse_real());
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100310 case CLOCK_MONOTONIC_COARSE:
Arnd Bergmann45e7f5d2018-06-18 17:31:36 +0200311 ktime_get_coarse_ts64(&tp);
312 return timespec64_to_ns(&tp);
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100313 case CLOCK_BOOTTIME:
Jason A. Donenfeld9285ec42019-06-21 22:32:48 +0200314 return ktime_get_boottime_ns();
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100315 case CLOCK_TAI:
Jason A. Donenfeld9285ec42019-06-21 22:32:48 +0200316 return ktime_get_clocktai_ns();
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100317 default:
318 BUG();
319 }
Gregor Boiriebc2b7da2016-03-09 19:05:49 +0100320}
321EXPORT_SYMBOL(iio_get_time_ns);
322
323/**
324 * iio_get_time_res() - utility function to get time stamp clock resolution in
325 * nano seconds.
326 * @indio_dev: device
327 */
328unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
329{
330 switch (iio_device_get_clock(indio_dev)) {
331 case CLOCK_REALTIME:
332 case CLOCK_MONOTONIC:
333 case CLOCK_MONOTONIC_RAW:
334 case CLOCK_BOOTTIME:
335 case CLOCK_TAI:
336 return hrtimer_resolution;
337 case CLOCK_REALTIME_COARSE:
338 case CLOCK_MONOTONIC_COARSE:
339 return LOW_RES_NSEC;
340 default:
341 BUG();
342 }
343}
344EXPORT_SYMBOL(iio_get_time_res);
345
Jonathan Cameron847ec802009-08-18 18:06:19 +0100346static int __init iio_init(void)
347{
348 int ret;
349
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100350 /* Register sysfs bus */
351 ret = bus_register(&iio_bus_type);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100352 if (ret < 0) {
Sachin Kamat3176dd52013-10-24 12:53:00 +0100353 pr_err("could not register bus type\n");
Jonathan Cameron847ec802009-08-18 18:06:19 +0100354 goto error_nothing;
355 }
356
Jonathan Cameron9aa1a162011-08-12 17:08:50 +0100357 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
358 if (ret < 0) {
Sachin Kamat3176dd52013-10-24 12:53:00 +0100359 pr_err("failed to allocate char dev region\n");
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100360 goto error_unregister_bus_type;
Jonathan Cameron9aa1a162011-08-12 17:08:50 +0100361 }
Jonathan Cameron847ec802009-08-18 18:06:19 +0100362
Michael Henneriche553f182012-03-01 10:51:03 +0100363 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
364
Jonathan Cameron847ec802009-08-18 18:06:19 +0100365 return 0;
366
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100367error_unregister_bus_type:
368 bus_unregister(&iio_bus_type);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100369error_nothing:
370 return ret;
371}
372
373static void __exit iio_exit(void)
374{
Jonathan Cameron9aa1a162011-08-12 17:08:50 +0100375 if (iio_devt)
376 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100377 bus_unregister(&iio_bus_type);
Michael Henneriche553f182012-03-01 10:51:03 +0100378 debugfs_remove(iio_debugfs_dentry);
379}
380
381#if defined(CONFIG_DEBUG_FS)
Michael Henneriche553f182012-03-01 10:51:03 +0100382static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
383 size_t count, loff_t *ppos)
384{
385 struct iio_dev *indio_dev = file->private_data;
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300386 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Michael Henneriche553f182012-03-01 10:51:03 +0100387 unsigned val = 0;
Michael Henneriche553f182012-03-01 10:51:03 +0100388 int ret;
389
Alexandru Tachici2ddc9822020-02-21 14:06:55 +0200390 if (*ppos > 0)
391 return simple_read_from_buffer(userbuf, count, ppos,
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300392 iio_dev_opaque->read_buf,
393 iio_dev_opaque->read_buf_len);
Alexandru Tachici2ddc9822020-02-21 14:06:55 +0200394
Michael Henneriche553f182012-03-01 10:51:03 +0100395 ret = indio_dev->info->debugfs_reg_access(indio_dev,
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300396 iio_dev_opaque->cached_reg_addr,
Michael Henneriche553f182012-03-01 10:51:03 +0100397 0, &val);
Matt Fornero3d62c782017-09-05 16:34:10 +0200398 if (ret) {
Michael Henneriche553f182012-03-01 10:51:03 +0100399 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
Matt Fornero3d62c782017-09-05 16:34:10 +0200400 return ret;
401 }
Michael Henneriche553f182012-03-01 10:51:03 +0100402
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300403 iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
404 sizeof(iio_dev_opaque->read_buf),
405 "0x%X\n", val);
Michael Henneriche553f182012-03-01 10:51:03 +0100406
Alexandru Tachici2ddc9822020-02-21 14:06:55 +0200407 return simple_read_from_buffer(userbuf, count, ppos,
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300408 iio_dev_opaque->read_buf,
409 iio_dev_opaque->read_buf_len);
Michael Henneriche553f182012-03-01 10:51:03 +0100410}
411
412static ssize_t iio_debugfs_write_reg(struct file *file,
413 const char __user *userbuf, size_t count, loff_t *ppos)
414{
415 struct iio_dev *indio_dev = file->private_data;
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300416 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Michael Henneriche553f182012-03-01 10:51:03 +0100417 unsigned reg, val;
418 char buf[80];
419 int ret;
420
421 count = min_t(size_t, count, (sizeof(buf)-1));
422 if (copy_from_user(buf, userbuf, count))
423 return -EFAULT;
424
425 buf[count] = 0;
426
427 ret = sscanf(buf, "%i %i", &reg, &val);
428
429 switch (ret) {
430 case 1:
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300431 iio_dev_opaque->cached_reg_addr = reg;
Michael Henneriche553f182012-03-01 10:51:03 +0100432 break;
433 case 2:
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300434 iio_dev_opaque->cached_reg_addr = reg;
Michael Henneriche553f182012-03-01 10:51:03 +0100435 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
436 val, NULL);
437 if (ret) {
438 dev_err(indio_dev->dev.parent, "%s: write failed\n",
439 __func__);
440 return ret;
441 }
442 break;
443 default:
444 return -EINVAL;
445 }
446
447 return count;
448}
449
450static const struct file_operations iio_debugfs_reg_fops = {
Axel Lin5a28c872012-05-03 09:50:51 +0800451 .open = simple_open,
Michael Henneriche553f182012-03-01 10:51:03 +0100452 .read = iio_debugfs_read_reg,
453 .write = iio_debugfs_write_reg,
454};
455
456static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
457{
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300458 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
459 debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100460}
461
Greg Kroah-Hartman8915aac2019-06-18 17:54:40 +0200462static void iio_device_register_debugfs(struct iio_dev *indio_dev)
Michael Henneriche553f182012-03-01 10:51:03 +0100463{
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300464 struct iio_dev_opaque *iio_dev_opaque;
465
Michael Henneriche553f182012-03-01 10:51:03 +0100466 if (indio_dev->info->debugfs_reg_access == NULL)
Greg Kroah-Hartman8915aac2019-06-18 17:54:40 +0200467 return;
Michael Henneriche553f182012-03-01 10:51:03 +0100468
Axel Linabd5a2f2012-05-03 22:56:58 +0800469 if (!iio_debugfs_dentry)
Greg Kroah-Hartman8915aac2019-06-18 17:54:40 +0200470 return;
Michael Henneriche553f182012-03-01 10:51:03 +0100471
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300472 iio_dev_opaque = to_iio_dev_opaque(indio_dev);
473
474 iio_dev_opaque->debugfs_dentry =
Michael Henneriche553f182012-03-01 10:51:03 +0100475 debugfs_create_dir(dev_name(&indio_dev->dev),
476 iio_debugfs_dentry);
Michael Henneriche553f182012-03-01 10:51:03 +0100477
Greg Kroah-Hartman8915aac2019-06-18 17:54:40 +0200478 debugfs_create_file("direct_reg_access", 0644,
Alexandru Ardelean96fb1b62020-06-30 07:57:05 +0300479 iio_dev_opaque->debugfs_dentry, indio_dev,
Greg Kroah-Hartman8915aac2019-06-18 17:54:40 +0200480 &iio_debugfs_reg_fops);
Michael Henneriche553f182012-03-01 10:51:03 +0100481}
482#else
Greg Kroah-Hartman8915aac2019-06-18 17:54:40 +0200483static void iio_device_register_debugfs(struct iio_dev *indio_dev)
Michael Henneriche553f182012-03-01 10:51:03 +0100484{
Michael Henneriche553f182012-03-01 10:51:03 +0100485}
486
487static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
488{
489}
490#endif /* CONFIG_DEBUG_FS */
491
Lars-Peter Clausen4fee7e162012-03-06 20:43:45 +0100492static ssize_t iio_read_channel_ext_info(struct device *dev,
493 struct device_attribute *attr,
494 char *buf)
495{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200496 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen4fee7e162012-03-06 20:43:45 +0100497 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
498 const struct iio_chan_spec_ext_info *ext_info;
499
500 ext_info = &this_attr->c->ext_info[this_attr->address];
501
Michael Hennerichfc6d1132012-04-27 10:58:36 +0200502 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
Lars-Peter Clausen4fee7e162012-03-06 20:43:45 +0100503}
504
505static ssize_t iio_write_channel_ext_info(struct device *dev,
506 struct device_attribute *attr,
507 const char *buf,
508 size_t len)
509{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200510 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen4fee7e162012-03-06 20:43:45 +0100511 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
512 const struct iio_chan_spec_ext_info *ext_info;
513
514 ext_info = &this_attr->c->ext_info[this_attr->address];
515
Michael Hennerichfc6d1132012-04-27 10:58:36 +0200516 return ext_info->write(indio_dev, ext_info->private,
517 this_attr->c, buf, len);
Lars-Peter Clausen4fee7e162012-03-06 20:43:45 +0100518}
519
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200520ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
521 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
522{
523 const struct iio_enum *e = (const struct iio_enum *)priv;
524 unsigned int i;
525 size_t len = 0;
526
527 if (!e->num_items)
528 return 0;
529
Lars-Peter Clausend9a0e732021-01-07 13:20:49 +0200530 for (i = 0; i < e->num_items; ++i) {
531 if (!e->items[i])
532 continue;
Lars-Peter Clausen02074832021-03-20 08:14:03 +0100533 len += sysfs_emit_at(buf, len, "%s ", e->items[i]);
Lars-Peter Clausend9a0e732021-01-07 13:20:49 +0200534 }
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200535
536 /* replace last space with a newline */
537 buf[len - 1] = '\n';
538
539 return len;
540}
541EXPORT_SYMBOL_GPL(iio_enum_available_read);
542
543ssize_t iio_enum_read(struct iio_dev *indio_dev,
544 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
545{
546 const struct iio_enum *e = (const struct iio_enum *)priv;
547 int i;
548
549 if (!e->get)
550 return -EINVAL;
551
552 i = e->get(indio_dev, chan);
553 if (i < 0)
554 return i;
Lars-Peter Clausend9a0e732021-01-07 13:20:49 +0200555 else if (i >= e->num_items || !e->items[i])
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200556 return -EINVAL;
557
Lars-Peter Clausen83ca56b2021-03-20 08:14:02 +0100558 return sysfs_emit(buf, "%s\n", e->items[i]);
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200559}
560EXPORT_SYMBOL_GPL(iio_enum_read);
561
562ssize_t iio_enum_write(struct iio_dev *indio_dev,
563 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
564 size_t len)
565{
566 const struct iio_enum *e = (const struct iio_enum *)priv;
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200567 int ret;
568
569 if (!e->set)
570 return -EINVAL;
571
Lars-Peter Clausend9a0e732021-01-07 13:20:49 +0200572 ret = iio_sysfs_match_string_with_gaps(e->items, e->num_items, buf);
Andy Shevchenko02e9a0ff2017-06-09 15:08:16 +0300573 if (ret < 0)
574 return ret;
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200575
Andy Shevchenko02e9a0ff2017-06-09 15:08:16 +0300576 ret = e->set(indio_dev, chan, ret);
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200577 return ret ? ret : len;
578}
579EXPORT_SYMBOL_GPL(iio_enum_write);
580
Gregor Boiriedfc57732016-04-20 19:23:43 +0200581static const struct iio_mount_matrix iio_mount_idmatrix = {
582 .rotation = {
583 "1", "0", "0",
584 "0", "1", "0",
585 "0", "0", "1"
586 }
587};
588
589static int iio_setup_mount_idmatrix(const struct device *dev,
590 struct iio_mount_matrix *matrix)
591{
592 *matrix = iio_mount_idmatrix;
593 dev_info(dev, "mounting matrix not found: using identity...\n");
594 return 0;
595}
596
597ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
598 const struct iio_chan_spec *chan, char *buf)
599{
600 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
601 priv)(indio_dev, chan);
602
603 if (IS_ERR(mtx))
604 return PTR_ERR(mtx);
605
606 if (!mtx)
607 mtx = &iio_mount_idmatrix;
608
Lars-Peter Clausen83ca56b2021-03-20 08:14:02 +0100609 return sysfs_emit(buf, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
610 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
611 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
612 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
Gregor Boiriedfc57732016-04-20 19:23:43 +0200613}
614EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
615
616/**
Andy Shevchenkofb158972019-02-21 18:02:46 +0100617 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
618 * device "mount-matrix" property
Gregor Boiriedfc57732016-04-20 19:23:43 +0200619 * @dev: device the mounting matrix property is assigned to
Gregor Boiriedfc57732016-04-20 19:23:43 +0200620 * @matrix: where to store retrieved matrix
621 *
622 * If device is assigned no mounting matrix property, a default 3x3 identity
623 * matrix will be filled in.
624 *
625 * Return: 0 if success, or a negative error code on failure.
626 */
Andy Shevchenkob8927702021-05-18 14:25:46 +0300627int iio_read_mount_matrix(struct device *dev, struct iio_mount_matrix *matrix)
Gregor Boiriedfc57732016-04-20 19:23:43 +0200628{
Andy Shevchenkofb158972019-02-21 18:02:46 +0100629 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
630 int err;
Gregor Boiriedfc57732016-04-20 19:23:43 +0200631
Andy Shevchenkob8927702021-05-18 14:25:46 +0300632 err = device_property_read_string_array(dev, "mount-matrix", matrix->rotation, len);
Andy Shevchenkofb158972019-02-21 18:02:46 +0100633 if (err == len)
634 return 0;
Gregor Boiriedfc57732016-04-20 19:23:43 +0200635
Andy Shevchenkofb158972019-02-21 18:02:46 +0100636 if (err >= 0)
637 /* Invalid number of matrix entries. */
638 return -EINVAL;
Gregor Boiriedfc57732016-04-20 19:23:43 +0200639
Andy Shevchenkofb158972019-02-21 18:02:46 +0100640 if (err != -EINVAL)
641 /* Invalid matrix declaration format. */
642 return err;
Gregor Boiriedfc57732016-04-20 19:23:43 +0200643
644 /* Matrix was not declared at all: fallback to identity. */
645 return iio_setup_mount_idmatrix(dev, matrix);
646}
Andy Shevchenkofb158972019-02-21 18:02:46 +0100647EXPORT_SYMBOL(iio_read_mount_matrix);
Gregor Boiriedfc57732016-04-20 19:23:43 +0200648
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100649static ssize_t __iio_format_value(char *buf, size_t offset, unsigned int type,
Jonathan Cameron51239602016-11-08 12:58:51 +0100650 int size, const int *vals)
651{
Jonathan Cameron51239602016-11-08 12:58:51 +0100652 int tmp0, tmp1;
Anand Ashok Dumbre0e7a3972020-10-05 08:05:16 -0700653 s64 tmp2;
Jonathan Cameron51239602016-11-08 12:58:51 +0100654 bool scale_db = false;
655
656 switch (type) {
657 case IIO_VAL_INT:
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100658 return sysfs_emit_at(buf, offset, "%d", vals[0]);
Jonathan Cameron51239602016-11-08 12:58:51 +0100659 case IIO_VAL_INT_PLUS_MICRO_DB:
660 scale_db = true;
Gustavo A. R. Silvadf561f662020-08-23 17:36:59 -0500661 fallthrough;
Jonathan Cameron51239602016-11-08 12:58:51 +0100662 case IIO_VAL_INT_PLUS_MICRO:
663 if (vals[1] < 0)
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100664 return sysfs_emit_at(buf, offset, "-%d.%06u%s",
665 abs(vals[0]), -vals[1],
666 scale_db ? " dB" : "");
Jonathan Cameron51239602016-11-08 12:58:51 +0100667 else
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100668 return sysfs_emit_at(buf, offset, "%d.%06u%s", vals[0],
669 vals[1], scale_db ? " dB" : "");
Jonathan Cameron51239602016-11-08 12:58:51 +0100670 case IIO_VAL_INT_PLUS_NANO:
671 if (vals[1] < 0)
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100672 return sysfs_emit_at(buf, offset, "-%d.%09u",
673 abs(vals[0]), -vals[1]);
Jonathan Cameron51239602016-11-08 12:58:51 +0100674 else
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100675 return sysfs_emit_at(buf, offset, "%d.%09u", vals[0],
676 vals[1]);
Jonathan Cameron51239602016-11-08 12:58:51 +0100677 case IIO_VAL_FRACTIONAL:
Anand Ashok Dumbre0e7a3972020-10-05 08:05:16 -0700678 tmp2 = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
Jonathan Cameron51239602016-11-08 12:58:51 +0100679 tmp1 = vals[1];
Anand Ashok Dumbre0e7a3972020-10-05 08:05:16 -0700680 tmp0 = (int)div_s64_rem(tmp2, 1000000000, &tmp1);
681 if ((tmp2 < 0) && (tmp0 == 0))
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100682 return sysfs_emit_at(buf, offset, "-0.%09u", abs(tmp1));
Anand Ashok Dumbre0e7a3972020-10-05 08:05:16 -0700683 else
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100684 return sysfs_emit_at(buf, offset, "%d.%09u", tmp0,
685 abs(tmp1));
Jonathan Cameron51239602016-11-08 12:58:51 +0100686 case IIO_VAL_FRACTIONAL_LOG2:
Lars-Peter Clausen2646a952020-12-15 20:17:41 +0100687 tmp2 = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
688 tmp0 = (int)div_s64_rem(tmp2, 1000000000LL, &tmp1);
Lars-Peter Clausen38a52cd2020-12-15 20:17:42 +0100689 if (tmp0 == 0 && tmp2 < 0)
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100690 return sysfs_emit_at(buf, offset, "-0.%09u", abs(tmp1));
Lars-Peter Clausen38a52cd2020-12-15 20:17:42 +0100691 else
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100692 return sysfs_emit_at(buf, offset, "%d.%09u", tmp0,
693 abs(tmp1));
Jonathan Cameron51239602016-11-08 12:58:51 +0100694 case IIO_VAL_INT_MULTIPLE:
695 {
696 int i;
697 int l = 0;
698
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100699 for (i = 0; i < size; ++i)
700 l += sysfs_emit_at(buf, offset + l, "%d ", vals[i]);
Jonathan Cameron51239602016-11-08 12:58:51 +0100701 return l;
702 }
Andrea Merello8cb34032019-11-20 15:47:51 +0100703 case IIO_VAL_CHAR:
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100704 return sysfs_emit_at(buf, offset, "%c", (char)vals[0]);
Andriy Tryshnivskyy6bb835f2021-10-24 12:16:26 +0300705 case IIO_VAL_INT_64:
706 tmp2 = (s64)((((u64)vals[1]) << 32) | (u32)vals[0]);
707 return sysfs_emit_at(buf, offset, "%lld", tmp2);
Jonathan Cameron51239602016-11-08 12:58:51 +0100708 default:
709 return 0;
710 }
711}
712
Lars-Peter Clausen3661f3f2013-10-07 15:11:00 +0100713/**
714 * iio_format_value() - Formats a IIO value into its string representation
Cristina Opriceana2498dcf2015-07-24 16:16:19 +0300715 * @buf: The buffer to which the formatted value gets written
Jonathan Cameron51239602016-11-08 12:58:51 +0100716 * which is assumed to be big enough (i.e. PAGE_SIZE).
Randy Dunlapc175cb72017-10-29 17:06:01 -0700717 * @type: One of the IIO_VAL_* constants. This decides how the val
Cristina Opriceana2498dcf2015-07-24 16:16:19 +0300718 * and val2 parameters are formatted.
719 * @size: Number of IIO value entries contained in vals
720 * @vals: Pointer to the values, exact meaning depends on the
721 * type parameter.
722 *
723 * Return: 0 by default, a negative number on failure or the
724 * total number of characters written for a type that belongs
Randy Dunlapc175cb72017-10-29 17:06:01 -0700725 * to the IIO_VAL_* constant.
Lars-Peter Clausen3661f3f2013-10-07 15:11:00 +0100726 */
Srinivas Pandruvada9fbfb4b2014-04-29 00:51:00 +0100727ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
Jonathan Cameron847ec802009-08-18 18:06:19 +0100728{
Jonathan Cameron51239602016-11-08 12:58:51 +0100729 ssize_t len;
Jonathan Cameron847ec802009-08-18 18:06:19 +0100730
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100731 len = __iio_format_value(buf, 0, type, size, vals);
Jonathan Cameron51239602016-11-08 12:58:51 +0100732 if (len >= PAGE_SIZE - 1)
733 return -EFBIG;
Srinivas Pandruvada9fbfb4b2014-04-29 00:51:00 +0100734
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100735 return len + sysfs_emit_at(buf, len, "\n");
Jonathan Cameron1d892712011-05-18 14:40:51 +0100736}
Andrew F. Davis7d2c2aca2015-12-14 16:35:57 -0600737EXPORT_SYMBOL_GPL(iio_format_value);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100738
Cristian Pop1d4ef9b2020-09-28 12:09:55 +0300739static ssize_t iio_read_channel_label(struct device *dev,
740 struct device_attribute *attr,
741 char *buf)
742{
743 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
744 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
745
Paul Cercueil13efdc32021-06-18 13:30:05 +0100746 if (indio_dev->info->read_label)
747 return indio_dev->info->read_label(indio_dev, this_attr->c, buf);
Cristian Pop1d4ef9b2020-09-28 12:09:55 +0300748
Paul Cercueil13efdc32021-06-18 13:30:05 +0100749 if (this_attr->c->extend_name)
750 return sprintf(buf, "%s\n", this_attr->c->extend_name);
751
752 return -EINVAL;
Cristian Pop1d4ef9b2020-09-28 12:09:55 +0300753}
754
Lars-Peter Clausen3661f3f2013-10-07 15:11:00 +0100755static ssize_t iio_read_channel_info(struct device *dev,
756 struct device_attribute *attr,
757 char *buf)
758{
759 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
760 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
Srinivas Pandruvada9fbfb4b2014-04-29 00:51:00 +0100761 int vals[INDIO_MAX_RAW_ELEMENTS];
762 int ret;
763 int val_len = 2;
764
765 if (indio_dev->info->read_raw_multi)
766 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
767 INDIO_MAX_RAW_ELEMENTS,
768 vals, &val_len,
769 this_attr->address);
770 else
771 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
772 &vals[0], &vals[1], this_attr->address);
Lars-Peter Clausen3661f3f2013-10-07 15:11:00 +0100773
774 if (ret < 0)
775 return ret;
776
Srinivas Pandruvada9fbfb4b2014-04-29 00:51:00 +0100777 return iio_format_value(buf, ret, val_len, vals);
Lars-Peter Clausen3661f3f2013-10-07 15:11:00 +0100778}
779
Lars-Peter Clauseneda20ba2020-11-14 12:59:59 +0100780static ssize_t iio_format_list(char *buf, const int *vals, int type, int length,
781 const char *prefix, const char *suffix)
Jonathan Cameron51239602016-11-08 12:58:51 +0100782{
Lars-Peter Clauseneda20ba2020-11-14 12:59:59 +0100783 ssize_t len;
Lars-Peter Clausene08b60d2020-11-14 13:00:00 +0100784 int stride;
Jonathan Cameron51239602016-11-08 12:58:51 +0100785 int i;
Lars-Peter Clauseneda20ba2020-11-14 12:59:59 +0100786
Jonathan Cameron51239602016-11-08 12:58:51 +0100787 switch (type) {
788 case IIO_VAL_INT:
Lars-Peter Clausene08b60d2020-11-14 13:00:00 +0100789 stride = 1;
Jonathan Cameron51239602016-11-08 12:58:51 +0100790 break;
791 default:
Lars-Peter Clausene08b60d2020-11-14 13:00:00 +0100792 stride = 2;
793 break;
794 }
795
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100796 len = sysfs_emit(buf, prefix);
Lars-Peter Clausene08b60d2020-11-14 13:00:00 +0100797
798 for (i = 0; i <= length - stride; i += stride) {
799 if (i != 0) {
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100800 len += sysfs_emit_at(buf, len, " ");
Jonathan Cameron51239602016-11-08 12:58:51 +0100801 if (len >= PAGE_SIZE)
802 return -EFBIG;
803 }
Lars-Peter Clausene08b60d2020-11-14 13:00:00 +0100804
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100805 len += __iio_format_value(buf, len, type, stride, &vals[i]);
Lars-Peter Clausene08b60d2020-11-14 13:00:00 +0100806 if (len >= PAGE_SIZE)
807 return -EFBIG;
Jonathan Cameron51239602016-11-08 12:58:51 +0100808 }
809
Lars-Peter Clausen6b92ba02021-03-20 08:14:04 +0100810 len += sysfs_emit_at(buf, len, "%s\n", suffix);
Lars-Peter Clausene08b60d2020-11-14 13:00:00 +0100811
Jonathan Cameron51239602016-11-08 12:58:51 +0100812 return len;
813}
814
Lars-Peter Clauseneda20ba2020-11-14 12:59:59 +0100815static ssize_t iio_format_avail_list(char *buf, const int *vals,
816 int type, int length)
817{
818
819 return iio_format_list(buf, vals, type, length, "", "");
820}
821
Jonathan Cameron51239602016-11-08 12:58:51 +0100822static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
823{
Lars-Peter Clauseneda20ba2020-11-14 12:59:59 +0100824 return iio_format_list(buf, vals, type, 3, "[", "]");
Jonathan Cameron51239602016-11-08 12:58:51 +0100825}
826
827static ssize_t iio_read_channel_info_avail(struct device *dev,
828 struct device_attribute *attr,
829 char *buf)
830{
831 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
832 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
833 const int *vals;
834 int ret;
835 int length;
836 int type;
837
838 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
839 &vals, &type, &length,
840 this_attr->address);
841
842 if (ret < 0)
843 return ret;
844 switch (ret) {
845 case IIO_AVAIL_LIST:
846 return iio_format_avail_list(buf, vals, type, length);
847 case IIO_AVAIL_RANGE:
848 return iio_format_avail_range(buf, vals, type);
849 default:
850 return -EINVAL;
851 }
852}
853
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000854/**
Beniamin Biab8528222020-02-06 17:11:45 +0200855 * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000856 * @str: The string to parse
857 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
858 * @integer: The integer part of the number
859 * @fract: The fractional part of the number
Beniamin Biab8528222020-02-06 17:11:45 +0200860 * @scale_db: True if this should parse as dB
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000861 *
862 * Returns 0 on success, or a negative error code if the string could not be
863 * parsed.
864 */
Beniamin Biab8528222020-02-06 17:11:45 +0200865static int __iio_str_to_fixpoint(const char *str, int fract_mult,
866 int *integer, int *fract, bool scale_db)
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000867{
868 int i = 0, f = 0;
869 bool integer_part = true, negative = false;
870
Sean Nyekjaerf47dff32015-11-09 13:55:34 +0100871 if (fract_mult == 0) {
872 *fract = 0;
873
874 return kstrtoint(str, 0, integer);
875 }
876
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000877 if (str[0] == '-') {
878 negative = true;
879 str++;
880 } else if (str[0] == '+') {
881 str++;
882 }
883
884 while (*str) {
885 if ('0' <= *str && *str <= '9') {
886 if (integer_part) {
887 i = i * 10 + *str - '0';
888 } else {
889 f += fract_mult * (*str - '0');
890 fract_mult /= 10;
891 }
892 } else if (*str == '\n') {
893 if (*(str + 1) == '\0')
894 break;
895 else
896 return -EINVAL;
Beniamin Biab8528222020-02-06 17:11:45 +0200897 } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
898 /* Ignore the dB suffix */
899 str += sizeof(" dB") - 1;
900 continue;
901 } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
902 /* Ignore the dB suffix */
903 str += sizeof("dB") - 1;
904 continue;
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000905 } else if (*str == '.' && integer_part) {
906 integer_part = false;
907 } else {
908 return -EINVAL;
909 }
910 str++;
911 }
912
913 if (negative) {
914 if (i)
915 i = -i;
916 else
917 f = -f;
918 }
919
920 *integer = i;
921 *fract = f;
922
923 return 0;
924}
Beniamin Biab8528222020-02-06 17:11:45 +0200925
926/**
927 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
928 * @str: The string to parse
929 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
930 * @integer: The integer part of the number
931 * @fract: The fractional part of the number
932 *
933 * Returns 0 on success, or a negative error code if the string could not be
934 * parsed.
935 */
936int iio_str_to_fixpoint(const char *str, int fract_mult,
937 int *integer, int *fract)
938{
939 return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
940}
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000941EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
942
Jonathan Cameron1d892712011-05-18 14:40:51 +0100943static ssize_t iio_write_channel_info(struct device *dev,
944 struct device_attribute *attr,
945 const char *buf,
946 size_t len)
947{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200948 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100949 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000950 int ret, fract_mult = 100000;
Andrea Merello8cb34032019-11-20 15:47:51 +0100951 int integer, fract = 0;
952 bool is_char = false;
Beniamin Biab8528222020-02-06 17:11:45 +0200953 bool scale_db = false;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100954
955 /* Assumes decimal - precision based on number of digits */
Jonathan Cameron6fe81352011-05-18 14:42:37 +0100956 if (!indio_dev->info->write_raw)
Jonathan Cameron1d892712011-05-18 14:40:51 +0100957 return -EINVAL;
Michael Hennerich5c04af02011-06-27 13:07:10 +0100958
959 if (indio_dev->info->write_raw_get_fmt)
960 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
961 this_attr->c, this_attr->address)) {
Sean Nyekjaerf47dff32015-11-09 13:55:34 +0100962 case IIO_VAL_INT:
963 fract_mult = 0;
964 break;
Beniamin Biab8528222020-02-06 17:11:45 +0200965 case IIO_VAL_INT_PLUS_MICRO_DB:
966 scale_db = true;
Gustavo A. R. Silvadf561f662020-08-23 17:36:59 -0500967 fallthrough;
Michael Hennerich5c04af02011-06-27 13:07:10 +0100968 case IIO_VAL_INT_PLUS_MICRO:
969 fract_mult = 100000;
970 break;
971 case IIO_VAL_INT_PLUS_NANO:
972 fract_mult = 100000000;
973 break;
Andrea Merello8cb34032019-11-20 15:47:51 +0100974 case IIO_VAL_CHAR:
975 is_char = true;
976 break;
Michael Hennerich5c04af02011-06-27 13:07:10 +0100977 default:
978 return -EINVAL;
979 }
980
Andrea Merello8cb34032019-11-20 15:47:51 +0100981 if (is_char) {
982 char ch;
983
984 if (sscanf(buf, "%c", &ch) != 1)
985 return -EINVAL;
986 integer = ch;
987 } else {
Mircea Caprioru5403f282020-04-01 14:22:30 +0300988 ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
989 scale_db);
Andrea Merello8cb34032019-11-20 15:47:51 +0100990 if (ret)
991 return ret;
992 }
Jonathan Cameron847ec802009-08-18 18:06:19 +0100993
Jonathan Cameron6fe81352011-05-18 14:42:37 +0100994 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
Michael Hennerich5c04af02011-06-27 13:07:10 +0100995 integer, fract, this_attr->address);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100996 if (ret)
997 return ret;
998
999 return len;
1000}
1001
Jonathan Camerondf9c1c42011-08-12 17:56:03 +01001002static
Jonathan Cameron1d892712011-05-18 14:40:51 +01001003int __iio_device_attr_init(struct device_attribute *dev_attr,
1004 const char *postfix,
1005 struct iio_chan_spec const *chan,
1006 ssize_t (*readfunc)(struct device *dev,
1007 struct device_attribute *attr,
1008 char *buf),
1009 ssize_t (*writefunc)(struct device *dev,
1010 struct device_attribute *attr,
1011 const char *buf,
1012 size_t len),
Jonathan Cameron37044322013-09-08 14:57:00 +01001013 enum iio_shared_by shared_by)
Jonathan Cameron1d892712011-05-18 14:40:51 +01001014{
Jonathan Cameron37044322013-09-08 14:57:00 +01001015 int ret = 0;
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001016 char *name = NULL;
Jonathan Cameron37044322013-09-08 14:57:00 +01001017 char *full_postfix;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001018 sysfs_attr_init(&dev_attr->attr);
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001019
1020 /* Build up postfix of <extend_name>_<modifier>_postfix */
Jonathan Cameron37044322013-09-08 14:57:00 +01001021 if (chan->modified && (shared_by == IIO_SEPARATE)) {
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001022 if (chan->extend_name)
1023 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
1024 iio_modifier_names[chan
1025 ->channel2],
1026 chan->extend_name,
1027 postfix);
1028 else
1029 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
1030 iio_modifier_names[chan
1031 ->channel2],
1032 postfix);
1033 } else {
Lars-Peter Clausen77bfa8b2014-02-14 14:19:00 +00001034 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001035 full_postfix = kstrdup(postfix, GFP_KERNEL);
1036 else
1037 full_postfix = kasprintf(GFP_KERNEL,
1038 "%s_%s",
1039 chan->extend_name,
1040 postfix);
1041 }
Jonathan Cameron37044322013-09-08 14:57:00 +01001042 if (full_postfix == NULL)
1043 return -ENOMEM;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001044
Justin P. Mattock4abf6f82012-02-29 22:00:38 -08001045 if (chan->differential) { /* Differential can not have modifier */
Jonathan Cameron37044322013-09-08 14:57:00 +01001046 switch (shared_by) {
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001047 case IIO_SHARED_BY_ALL:
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001048 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001049 break;
1050 case IIO_SHARED_BY_DIR:
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001051 name = kasprintf(GFP_KERNEL, "%s_%s",
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001052 iio_direction[chan->output],
1053 full_postfix);
1054 break;
Jonathan Cameron37044322013-09-08 14:57:00 +01001055 case IIO_SHARED_BY_TYPE:
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001056 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001057 iio_direction[chan->output],
1058 iio_chan_type_name_spec[chan->type],
1059 iio_chan_type_name_spec[chan->type],
1060 full_postfix);
Jonathan Cameron37044322013-09-08 14:57:00 +01001061 break;
1062 case IIO_SEPARATE:
1063 if (!chan->indexed) {
Dan Carpenter231bfe52015-11-21 13:33:00 +03001064 WARN(1, "Differential channels must be indexed\n");
Jonathan Cameron37044322013-09-08 14:57:00 +01001065 ret = -EINVAL;
1066 goto error_free_full_postfix;
1067 }
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001068 name = kasprintf(GFP_KERNEL,
Jonathan Cameron37044322013-09-08 14:57:00 +01001069 "%s_%s%d-%s%d_%s",
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001070 iio_direction[chan->output],
1071 iio_chan_type_name_spec[chan->type],
1072 chan->channel,
1073 iio_chan_type_name_spec[chan->type],
1074 chan->channel2,
1075 full_postfix);
Jonathan Cameron37044322013-09-08 14:57:00 +01001076 break;
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001077 }
1078 } else { /* Single ended */
Jonathan Cameron37044322013-09-08 14:57:00 +01001079 switch (shared_by) {
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001080 case IIO_SHARED_BY_ALL:
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001081 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001082 break;
1083 case IIO_SHARED_BY_DIR:
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001084 name = kasprintf(GFP_KERNEL, "%s_%s",
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001085 iio_direction[chan->output],
1086 full_postfix);
1087 break;
Jonathan Cameron37044322013-09-08 14:57:00 +01001088 case IIO_SHARED_BY_TYPE:
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001089 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001090 iio_direction[chan->output],
1091 iio_chan_type_name_spec[chan->type],
1092 full_postfix);
Jonathan Cameron37044322013-09-08 14:57:00 +01001093 break;
1094
1095 case IIO_SEPARATE:
1096 if (chan->indexed)
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001097 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
Jonathan Cameron37044322013-09-08 14:57:00 +01001098 iio_direction[chan->output],
1099 iio_chan_type_name_spec[chan->type],
1100 chan->channel,
1101 full_postfix);
1102 else
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001103 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
Jonathan Cameron37044322013-09-08 14:57:00 +01001104 iio_direction[chan->output],
1105 iio_chan_type_name_spec[chan->type],
1106 full_postfix);
1107 break;
1108 }
Jonathan Cameronade7ef72011-09-02 17:14:45 +01001109 }
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001110 if (name == NULL) {
Jonathan Cameron1d892712011-05-18 14:40:51 +01001111 ret = -ENOMEM;
1112 goto error_free_full_postfix;
1113 }
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001114 dev_attr->attr.name = name;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001115
1116 if (readfunc) {
1117 dev_attr->attr.mode |= S_IRUGO;
1118 dev_attr->show = readfunc;
1119 }
1120
1121 if (writefunc) {
1122 dev_attr->attr.mode |= S_IWUSR;
1123 dev_attr->store = writefunc;
1124 }
Lars-Peter Clausen7bbcf7e2014-02-14 14:19:00 +00001125
Jonathan Cameron1d892712011-05-18 14:40:51 +01001126error_free_full_postfix:
1127 kfree(full_postfix);
Jonathan Cameron37044322013-09-08 14:57:00 +01001128
Jonathan Cameron847ec802009-08-18 18:06:19 +01001129 return ret;
1130}
1131
Jonathan Camerondf9c1c42011-08-12 17:56:03 +01001132static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
Jonathan Cameron1d892712011-05-18 14:40:51 +01001133{
1134 kfree(dev_attr->attr.name);
1135}
1136
1137int __iio_add_chan_devattr(const char *postfix,
Jonathan Cameron1d892712011-05-18 14:40:51 +01001138 struct iio_chan_spec const *chan,
1139 ssize_t (*readfunc)(struct device *dev,
1140 struct device_attribute *attr,
1141 char *buf),
1142 ssize_t (*writefunc)(struct device *dev,
1143 struct device_attribute *attr,
1144 const char *buf,
1145 size_t len),
Jonathan Camerone614a542011-09-02 17:14:41 +01001146 u64 mask,
Jonathan Cameron37044322013-09-08 14:57:00 +01001147 enum iio_shared_by shared_by,
Jonathan Cameron1d892712011-05-18 14:40:51 +01001148 struct device *dev,
Alexandru Ardelean3e3d11b2021-02-15 12:40:32 +02001149 struct iio_buffer *buffer,
Jonathan Cameron1d892712011-05-18 14:40:51 +01001150 struct list_head *attr_list)
1151{
1152 int ret;
1153 struct iio_dev_attr *iio_attr, *t;
1154
Sachin Kamat670c1102013-10-24 12:53:00 +01001155 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
Hartmut Knaack92825ff2014-02-16 11:53:00 +00001156 if (iio_attr == NULL)
1157 return -ENOMEM;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001158 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1159 postfix, chan,
Jonathan Cameron37044322013-09-08 14:57:00 +01001160 readfunc, writefunc, shared_by);
Jonathan Cameron1d892712011-05-18 14:40:51 +01001161 if (ret)
1162 goto error_iio_dev_attr_free;
1163 iio_attr->c = chan;
1164 iio_attr->address = mask;
Alexandru Ardelean3e3d11b2021-02-15 12:40:32 +02001165 iio_attr->buffer = buffer;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001166 list_for_each_entry(t, attr_list, l)
1167 if (strcmp(t->dev_attr.attr.name,
1168 iio_attr->dev_attr.attr.name) == 0) {
Jonathan Cameron37044322013-09-08 14:57:00 +01001169 if (shared_by == IIO_SEPARATE)
Jonathan Cameron1d892712011-05-18 14:40:51 +01001170 dev_err(dev, "tried to double register : %s\n",
1171 t->dev_attr.attr.name);
1172 ret = -EBUSY;
1173 goto error_device_attr_deinit;
1174 }
Jonathan Cameron1d892712011-05-18 14:40:51 +01001175 list_add(&iio_attr->l, attr_list);
1176
1177 return 0;
1178
1179error_device_attr_deinit:
1180 __iio_device_attr_deinit(&iio_attr->dev_attr);
1181error_iio_dev_attr_free:
1182 kfree(iio_attr);
Jonathan Cameron1d892712011-05-18 14:40:51 +01001183 return ret;
1184}
1185
Cristian Pop1d4ef9b2020-09-28 12:09:55 +03001186static int iio_device_add_channel_label(struct iio_dev *indio_dev,
1187 struct iio_chan_spec const *chan)
1188{
1189 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1190 int ret;
1191
Paul Cercueil13efdc32021-06-18 13:30:05 +01001192 if (!indio_dev->info->read_label && !chan->extend_name)
Cristian Pop1d4ef9b2020-09-28 12:09:55 +03001193 return 0;
1194
1195 ret = __iio_add_chan_devattr("label",
1196 chan,
1197 &iio_read_channel_label,
1198 NULL,
1199 0,
1200 IIO_SEPARATE,
1201 &indio_dev->dev,
Alexandru Ardelean3e3d11b2021-02-15 12:40:32 +02001202 NULL,
Cristian Pop1d4ef9b2020-09-28 12:09:55 +03001203 &iio_dev_opaque->channel_attr_list);
1204 if (ret < 0)
1205 return ret;
1206
1207 return 1;
1208}
1209
Jonathan Cameron37044322013-09-08 14:57:00 +01001210static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1211 struct iio_chan_spec const *chan,
1212 enum iio_shared_by shared_by,
1213 const long *infomask)
1214{
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001215 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Jonathan Cameron37044322013-09-08 14:57:00 +01001216 int i, ret, attrcount = 0;
1217
Orson Zhai1016d562017-04-25 09:16:56 +08001218 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
Jonathan Cameronef4b4852014-01-03 22:24:00 +00001219 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1220 return -EINVAL;
Jonathan Cameron37044322013-09-08 14:57:00 +01001221 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1222 chan,
1223 &iio_read_channel_info,
1224 &iio_write_channel_info,
1225 i,
1226 shared_by,
1227 &indio_dev->dev,
Alexandru Ardelean3e3d11b2021-02-15 12:40:32 +02001228 NULL,
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001229 &iio_dev_opaque->channel_attr_list);
Jonathan Cameron37044322013-09-08 14:57:00 +01001230 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1231 continue;
1232 else if (ret < 0)
1233 return ret;
1234 attrcount++;
1235 }
1236
1237 return attrcount;
1238}
1239
Jonathan Cameron51239602016-11-08 12:58:51 +01001240static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1241 struct iio_chan_spec const *chan,
1242 enum iio_shared_by shared_by,
1243 const long *infomask)
1244{
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001245 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Jonathan Cameron51239602016-11-08 12:58:51 +01001246 int i, ret, attrcount = 0;
1247 char *avail_postfix;
1248
Orson Zhai1016d562017-04-25 09:16:56 +08001249 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
Young Xiao936d3e52019-06-04 20:40:00 +08001250 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1251 return -EINVAL;
Jonathan Cameron51239602016-11-08 12:58:51 +01001252 avail_postfix = kasprintf(GFP_KERNEL,
1253 "%s_available",
1254 iio_chan_info_postfix[i]);
1255 if (!avail_postfix)
1256 return -ENOMEM;
1257
1258 ret = __iio_add_chan_devattr(avail_postfix,
1259 chan,
1260 &iio_read_channel_info_avail,
1261 NULL,
1262 i,
1263 shared_by,
1264 &indio_dev->dev,
Alexandru Ardelean3e3d11b2021-02-15 12:40:32 +02001265 NULL,
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001266 &iio_dev_opaque->channel_attr_list);
Jonathan Cameron51239602016-11-08 12:58:51 +01001267 kfree(avail_postfix);
1268 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1269 continue;
1270 else if (ret < 0)
1271 return ret;
1272 attrcount++;
1273 }
1274
1275 return attrcount;
1276}
1277
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001278static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
Jonathan Cameron1d892712011-05-18 14:40:51 +01001279 struct iio_chan_spec const *chan)
1280{
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001281 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Jonathan Cameron5ccb3ad2012-04-15 17:41:16 +01001282 int ret, attrcount = 0;
Lars-Peter Clausen5f420b42012-02-21 18:38:12 +01001283 const struct iio_chan_spec_ext_info *ext_info;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001284
Jonathan Cameron1d892712011-05-18 14:40:51 +01001285 if (chan->channel < 0)
1286 return 0;
Jonathan Cameron37044322013-09-08 14:57:00 +01001287 ret = iio_device_add_info_mask_type(indio_dev, chan,
1288 IIO_SEPARATE,
1289 &chan->info_mask_separate);
1290 if (ret < 0)
1291 return ret;
1292 attrcount += ret;
1293
Jonathan Cameron51239602016-11-08 12:58:51 +01001294 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1295 IIO_SEPARATE,
1296 &chan->
1297 info_mask_separate_available);
1298 if (ret < 0)
1299 return ret;
1300 attrcount += ret;
1301
Jonathan Cameron37044322013-09-08 14:57:00 +01001302 ret = iio_device_add_info_mask_type(indio_dev, chan,
1303 IIO_SHARED_BY_TYPE,
1304 &chan->info_mask_shared_by_type);
1305 if (ret < 0)
1306 return ret;
1307 attrcount += ret;
Lars-Peter Clausen5f420b42012-02-21 18:38:12 +01001308
Jonathan Cameron51239602016-11-08 12:58:51 +01001309 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1310 IIO_SHARED_BY_TYPE,
1311 &chan->
1312 info_mask_shared_by_type_available);
1313 if (ret < 0)
1314 return ret;
1315 attrcount += ret;
1316
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001317 ret = iio_device_add_info_mask_type(indio_dev, chan,
1318 IIO_SHARED_BY_DIR,
1319 &chan->info_mask_shared_by_dir);
1320 if (ret < 0)
1321 return ret;
1322 attrcount += ret;
1323
Jonathan Cameron51239602016-11-08 12:58:51 +01001324 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1325 IIO_SHARED_BY_DIR,
1326 &chan->info_mask_shared_by_dir_available);
1327 if (ret < 0)
1328 return ret;
1329 attrcount += ret;
1330
Jonathan Cameronc006ec82013-09-08 14:57:00 +01001331 ret = iio_device_add_info_mask_type(indio_dev, chan,
1332 IIO_SHARED_BY_ALL,
1333 &chan->info_mask_shared_by_all);
1334 if (ret < 0)
1335 return ret;
1336 attrcount += ret;
1337
Jonathan Cameron51239602016-11-08 12:58:51 +01001338 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1339 IIO_SHARED_BY_ALL,
1340 &chan->info_mask_shared_by_all_available);
1341 if (ret < 0)
1342 return ret;
1343 attrcount += ret;
1344
Cristian Pop1d4ef9b2020-09-28 12:09:55 +03001345 ret = iio_device_add_channel_label(indio_dev, chan);
1346 if (ret < 0)
1347 return ret;
1348 attrcount += ret;
1349
Lars-Peter Clausen5f420b42012-02-21 18:38:12 +01001350 if (chan->ext_info) {
1351 unsigned int i = 0;
1352 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1353 ret = __iio_add_chan_devattr(ext_info->name,
1354 chan,
1355 ext_info->read ?
1356 &iio_read_channel_ext_info : NULL,
1357 ext_info->write ?
1358 &iio_write_channel_ext_info : NULL,
1359 i,
1360 ext_info->shared,
1361 &indio_dev->dev,
Alexandru Ardelean3e3d11b2021-02-15 12:40:32 +02001362 NULL,
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001363 &iio_dev_opaque->channel_attr_list);
Lars-Peter Clausen5f420b42012-02-21 18:38:12 +01001364 i++;
1365 if (ret == -EBUSY && ext_info->shared)
1366 continue;
1367
1368 if (ret)
Jonathan Cameron37044322013-09-08 14:57:00 +01001369 return ret;
Lars-Peter Clausen5f420b42012-02-21 18:38:12 +01001370
1371 attrcount++;
1372 }
1373 }
1374
Jonathan Cameron37044322013-09-08 14:57:00 +01001375 return attrcount;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001376}
1377
Lars-Peter Clausen84088eb2013-10-07 12:50:00 +01001378/**
1379 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1380 * @attr_list: List of IIO device attributes
1381 *
1382 * This function frees the memory allocated for each of the IIO device
Martin Fuzzeyc1b03ab2015-02-19 15:17:44 +01001383 * attributes in the list.
Lars-Peter Clausen84088eb2013-10-07 12:50:00 +01001384 */
1385void iio_free_chan_devattr_list(struct list_head *attr_list)
Jonathan Cameron1d892712011-05-18 14:40:51 +01001386{
Lars-Peter Clausen84088eb2013-10-07 12:50:00 +01001387 struct iio_dev_attr *p, *n;
1388
1389 list_for_each_entry_safe(p, n, attr_list, l) {
Alexandru Ardelean15097c72021-02-15 12:40:33 +02001390 kfree_const(p->dev_attr.attr.name);
Martin Fuzzeyc1b03ab2015-02-19 15:17:44 +01001391 list_del(&p->l);
Lars-Peter Clausen84088eb2013-10-07 12:50:00 +01001392 kfree(p);
1393 }
Jonathan Cameron1d892712011-05-18 14:40:51 +01001394}
1395
Jonathan Cameron1b732882011-05-18 14:41:43 +01001396static ssize_t iio_show_dev_name(struct device *dev,
1397 struct device_attribute *attr,
1398 char *buf)
1399{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +02001400 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen83ca56b2021-03-20 08:14:02 +01001401 return sysfs_emit(buf, "%s\n", indio_dev->name);
Jonathan Cameron1b732882011-05-18 14:41:43 +01001402}
1403
1404static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1405
Phil Reid2c3d0c92019-09-19 22:36:08 +08001406static ssize_t iio_show_dev_label(struct device *dev,
1407 struct device_attribute *attr,
1408 char *buf)
1409{
1410 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen83ca56b2021-03-20 08:14:02 +01001411 return sysfs_emit(buf, "%s\n", indio_dev->label);
Phil Reid2c3d0c92019-09-19 22:36:08 +08001412}
1413
1414static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
1415
Gregor Boiriebc2b7da2016-03-09 19:05:49 +01001416static ssize_t iio_show_timestamp_clock(struct device *dev,
1417 struct device_attribute *attr,
1418 char *buf)
1419{
1420 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1421 const clockid_t clk = iio_device_get_clock(indio_dev);
1422 const char *name;
1423 ssize_t sz;
1424
1425 switch (clk) {
1426 case CLOCK_REALTIME:
1427 name = "realtime\n";
1428 sz = sizeof("realtime\n");
1429 break;
1430 case CLOCK_MONOTONIC:
1431 name = "monotonic\n";
1432 sz = sizeof("monotonic\n");
1433 break;
1434 case CLOCK_MONOTONIC_RAW:
1435 name = "monotonic_raw\n";
1436 sz = sizeof("monotonic_raw\n");
1437 break;
1438 case CLOCK_REALTIME_COARSE:
1439 name = "realtime_coarse\n";
1440 sz = sizeof("realtime_coarse\n");
1441 break;
1442 case CLOCK_MONOTONIC_COARSE:
1443 name = "monotonic_coarse\n";
1444 sz = sizeof("monotonic_coarse\n");
1445 break;
1446 case CLOCK_BOOTTIME:
1447 name = "boottime\n";
1448 sz = sizeof("boottime\n");
1449 break;
1450 case CLOCK_TAI:
1451 name = "tai\n";
1452 sz = sizeof("tai\n");
1453 break;
1454 default:
1455 BUG();
1456 }
1457
1458 memcpy(buf, name, sz);
1459 return sz;
1460}
1461
1462static ssize_t iio_store_timestamp_clock(struct device *dev,
1463 struct device_attribute *attr,
1464 const char *buf, size_t len)
1465{
1466 clockid_t clk;
1467 int ret;
1468
1469 if (sysfs_streq(buf, "realtime"))
1470 clk = CLOCK_REALTIME;
1471 else if (sysfs_streq(buf, "monotonic"))
1472 clk = CLOCK_MONOTONIC;
1473 else if (sysfs_streq(buf, "monotonic_raw"))
1474 clk = CLOCK_MONOTONIC_RAW;
1475 else if (sysfs_streq(buf, "realtime_coarse"))
1476 clk = CLOCK_REALTIME_COARSE;
1477 else if (sysfs_streq(buf, "monotonic_coarse"))
1478 clk = CLOCK_MONOTONIC_COARSE;
1479 else if (sysfs_streq(buf, "boottime"))
1480 clk = CLOCK_BOOTTIME;
1481 else if (sysfs_streq(buf, "tai"))
1482 clk = CLOCK_TAI;
1483 else
1484 return -EINVAL;
1485
1486 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1487 if (ret)
1488 return ret;
1489
1490 return len;
1491}
1492
Alexandru Ardelean32f17172021-02-15 12:40:29 +02001493int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
1494 const struct attribute_group *group)
1495{
1496 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1497 const struct attribute_group **new, **old = iio_dev_opaque->groups;
1498 unsigned int cnt = iio_dev_opaque->groupcounter;
1499
1500 new = krealloc(old, sizeof(*new) * (cnt + 2), GFP_KERNEL);
1501 if (!new)
1502 return -ENOMEM;
1503
1504 new[iio_dev_opaque->groupcounter++] = group;
1505 new[iio_dev_opaque->groupcounter] = NULL;
1506
1507 iio_dev_opaque->groups = new;
1508
1509 return 0;
1510}
1511
Gregor Boiriebc2b7da2016-03-09 19:05:49 +01001512static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1513 iio_show_timestamp_clock, iio_store_timestamp_clock);
1514
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001515static int iio_device_register_sysfs(struct iio_dev *indio_dev)
Jonathan Cameron1d892712011-05-18 14:40:51 +01001516{
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001517 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001518 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
Lars-Peter Clausen84088eb2013-10-07 12:50:00 +01001519 struct iio_dev_attr *p;
Gregor Boiriebc2b7da2016-03-09 19:05:49 +01001520 struct attribute **attr, *clk = NULL;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001521
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001522 /* First count elements in any existing group */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001523 if (indio_dev->info->attrs) {
1524 attr = indio_dev->info->attrs->attrs;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001525 while (*attr++ != NULL)
1526 attrcount_orig++;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001527 }
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001528 attrcount = attrcount_orig;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001529 /*
1530 * New channel registration method - relies on the fact a group does
Peter Meerwaldd25b3802012-08-26 13:43:00 +01001531 * not need to be initialized if its name is NULL.
Jonathan Cameron1d892712011-05-18 14:40:51 +01001532 */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001533 if (indio_dev->channels)
1534 for (i = 0; i < indio_dev->num_channels; i++) {
Gregor Boiriebc2b7da2016-03-09 19:05:49 +01001535 const struct iio_chan_spec *chan =
1536 &indio_dev->channels[i];
1537
1538 if (chan->type == IIO_TIMESTAMP)
1539 clk = &dev_attr_current_timestamp_clock.attr;
1540
1541 ret = iio_device_add_channel_sysfs(indio_dev, chan);
Jonathan Cameron1d892712011-05-18 14:40:51 +01001542 if (ret < 0)
1543 goto error_clear_attrs;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001544 attrcount += ret;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001545 }
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001546
Alexandru Ardeleanfa83c3b2020-06-30 07:57:08 +03001547 if (iio_dev_opaque->event_interface)
Gregor Boiriebc2b7da2016-03-09 19:05:49 +01001548 clk = &dev_attr_current_timestamp_clock.attr;
1549
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001550 if (indio_dev->name)
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001551 attrcount++;
Phil Reid2c3d0c92019-09-19 22:36:08 +08001552 if (indio_dev->label)
1553 attrcount++;
Gregor Boiriebc2b7da2016-03-09 19:05:49 +01001554 if (clk)
1555 attrcount++;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001556
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001557 iio_dev_opaque->chan_attr_group.attrs =
1558 kcalloc(attrcount + 1,
1559 sizeof(iio_dev_opaque->chan_attr_group.attrs[0]),
1560 GFP_KERNEL);
1561 if (iio_dev_opaque->chan_attr_group.attrs == NULL) {
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001562 ret = -ENOMEM;
1563 goto error_clear_attrs;
Jonathan Cameron1b732882011-05-18 14:41:43 +01001564 }
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001565 /* Copy across original attributes */
Hans de Goede18b4c9c2020-11-25 09:46:06 +01001566 if (indio_dev->info->attrs) {
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001567 memcpy(iio_dev_opaque->chan_attr_group.attrs,
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001568 indio_dev->info->attrs->attrs,
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001569 sizeof(iio_dev_opaque->chan_attr_group.attrs[0])
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001570 *attrcount_orig);
Hans de Goede18b4c9c2020-11-25 09:46:06 +01001571 iio_dev_opaque->chan_attr_group.is_visible =
1572 indio_dev->info->attrs->is_visible;
1573 }
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001574 attrn = attrcount_orig;
1575 /* Add all elements from the list. */
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001576 list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l)
1577 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001578 if (indio_dev->name)
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001579 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
Phil Reid2c3d0c92019-09-19 22:36:08 +08001580 if (indio_dev->label)
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001581 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
Gregor Boiriebc2b7da2016-03-09 19:05:49 +01001582 if (clk)
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001583 iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001584
Alexandru Ardelean32f17172021-02-15 12:40:29 +02001585 ret = iio_device_register_sysfs_group(indio_dev,
1586 &iio_dev_opaque->chan_attr_group);
1587 if (ret)
1588 goto error_clear_attrs;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001589
Jonathan Cameron1d892712011-05-18 14:40:51 +01001590 return 0;
Jonathan Cameron1b732882011-05-18 14:41:43 +01001591
Jonathan Cameron1d892712011-05-18 14:40:51 +01001592error_clear_attrs:
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001593 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
Jonathan Cameron1d892712011-05-18 14:40:51 +01001594
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001595 return ret;
Jonathan Cameron1d892712011-05-18 14:40:51 +01001596}
1597
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001598static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
Jonathan Cameron847ec802009-08-18 18:06:19 +01001599{
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001600 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Jonathan Cameron1d892712011-05-18 14:40:51 +01001601
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001602 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1603 kfree(iio_dev_opaque->chan_attr_group.attrs);
1604 iio_dev_opaque->chan_attr_group.attrs = NULL;
Alexandru Ardelean32f17172021-02-15 12:40:29 +02001605 kfree(iio_dev_opaque->groups);
Yang Yingliang19833c42021-10-13 11:05:32 +08001606 iio_dev_opaque->groups = NULL;
Jonathan Cameron847ec802009-08-18 18:06:19 +01001607}
1608
Jonathan Cameron847ec802009-08-18 18:06:19 +01001609static void iio_dev_release(struct device *device)
1610{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +02001611 struct iio_dev *indio_dev = dev_to_iio_dev(device);
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +03001612 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1613
Benjamin Gaignardd89e1192017-04-27 15:29:15 +02001614 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001615 iio_device_unregister_trigger_consumer(indio_dev);
1616 iio_device_unregister_eventset(indio_dev);
1617 iio_device_unregister_sysfs(indio_dev);
Lars-Peter Clausene407fd62012-06-04 10:41:42 +02001618
Alexandru Ardelean218bc532021-03-07 20:54:44 +02001619 iio_device_detach_buffers(indio_dev);
Lars-Peter Clausen9e69c932013-10-04 12:06:00 +01001620
Jonathan Cameron15ea28782021-04-26 18:49:03 +01001621 ida_simple_remove(&iio_ida, iio_dev_opaque->id);
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +03001622 kfree(iio_dev_opaque);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001623}
1624
Lars-Peter Clausen3c33b7b2021-10-31 09:04:21 +01001625const struct device_type iio_device_type = {
Jonathan Cameron847ec802009-08-18 18:06:19 +01001626 .name = "iio_device",
1627 .release = iio_dev_release,
1628};
1629
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001630/**
1631 * iio_device_alloc() - allocate an iio_dev from a driver
Jonathan Cameronc9561fd2020-09-13 14:21:15 +01001632 * @parent: Parent device.
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001633 * @sizeof_priv: Space to allocate for private structure.
1634 **/
Alexandru Ardelean78289b42020-06-03 14:40:18 +03001635struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
Jonathan Cameron847ec802009-08-18 18:06:19 +01001636{
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +03001637 struct iio_dev_opaque *iio_dev_opaque;
Alexandru Ardelean0d596bb2021-02-15 12:40:40 +02001638 struct iio_dev *indio_dev;
Jonathan Cameron6f7c8ee2011-04-15 18:55:56 +01001639 size_t alloc_size;
1640
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +03001641 alloc_size = sizeof(struct iio_dev_opaque);
Jonathan Cameron6f7c8ee2011-04-15 18:55:56 +01001642 if (sizeof_priv) {
1643 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1644 alloc_size += sizeof_priv;
1645 }
Jonathan Cameron6f7c8ee2011-04-15 18:55:56 +01001646
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +03001647 iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
1648 if (!iio_dev_opaque)
Jonathan Cameron0d4b2182020-04-19 16:13:37 +01001649 return NULL;
Jonathan Cameron847ec802009-08-18 18:06:19 +01001650
Alexandru Ardelean0d596bb2021-02-15 12:40:40 +02001651 indio_dev = &iio_dev_opaque->indio_dev;
1652 indio_dev->priv = (char *)iio_dev_opaque +
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +03001653 ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
1654
Alexandru Ardelean0d596bb2021-02-15 12:40:40 +02001655 indio_dev->dev.parent = parent;
1656 indio_dev->dev.type = &iio_device_type;
1657 indio_dev->dev.bus = &iio_bus_type;
1658 device_initialize(&indio_dev->dev);
Alexandru Ardelean0d596bb2021-02-15 12:40:40 +02001659 mutex_init(&indio_dev->mlock);
Jonathan Cameronb804e2b2021-04-26 18:49:08 +01001660 mutex_init(&iio_dev_opaque->info_exist_lock);
Alexandru Ardelean207c2d22020-06-30 07:57:06 +03001661 INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list);
Jonathan Camerona9e39f92011-09-14 13:01:25 +01001662
Jonathan Cameron15ea28782021-04-26 18:49:03 +01001663 iio_dev_opaque->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1664 if (iio_dev_opaque->id < 0) {
Jonathan Cameron0d4b2182020-04-19 16:13:37 +01001665 /* cannot use a dev_err as the name isn't available */
1666 pr_err("failed to get device id\n");
Alexandru Ardelean6d4ebd52020-06-30 07:57:03 +03001667 kfree(iio_dev_opaque);
Jonathan Cameron0d4b2182020-04-19 16:13:37 +01001668 return NULL;
Jonathan Cameron847ec802009-08-18 18:06:19 +01001669 }
Yang Yingliangfe6f45f2021-10-12 14:36:24 +08001670
1671 if (dev_set_name(&indio_dev->dev, "iio:device%d", iio_dev_opaque->id)) {
1672 ida_simple_remove(&iio_ida, iio_dev_opaque->id);
1673 kfree(iio_dev_opaque);
1674 return NULL;
1675 }
1676
Alexandru Ardelean6a8c6b22020-06-30 07:57:07 +03001677 INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001678 INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001679
Alexandru Ardelean0d596bb2021-02-15 12:40:40 +02001680 return indio_dev;
Jonathan Cameron847ec802009-08-18 18:06:19 +01001681}
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +02001682EXPORT_SYMBOL(iio_device_alloc);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001683
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001684/**
1685 * iio_device_free() - free an iio_dev from a driver
1686 * @dev: the iio_dev associated with the device
1687 **/
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +02001688void iio_device_free(struct iio_dev *dev)
Jonathan Cameron847ec802009-08-18 18:06:19 +01001689{
Lars-Peter Clausene407fd62012-06-04 10:41:42 +02001690 if (dev)
1691 put_device(&dev->dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001692}
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +02001693EXPORT_SYMBOL(iio_device_free);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001694
Yicong Yangcf5724e2021-04-08 19:38:14 +08001695static void devm_iio_device_release(void *iio_dev)
Grygorii Strashko9dabaf52013-07-18 11:19:00 +01001696{
Yicong Yangcf5724e2021-04-08 19:38:14 +08001697 iio_device_free(iio_dev);
Grygorii Strashko9dabaf52013-07-18 11:19:00 +01001698}
1699
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001700/**
1701 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
Alexandru Ardelean78289b42020-06-03 14:40:18 +03001702 * @parent: Device to allocate iio_dev for, and parent for this IIO device
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001703 * @sizeof_priv: Space to allocate for private structure.
1704 *
1705 * Managed iio_device_alloc. iio_dev allocated with this function is
1706 * automatically freed on driver detach.
1707 *
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001708 * RETURNS:
1709 * Pointer to allocated iio_dev on success, NULL on failure.
1710 */
Alexandru Ardelean78289b42020-06-03 14:40:18 +03001711struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
Grygorii Strashko9dabaf52013-07-18 11:19:00 +01001712{
Yicong Yangcf5724e2021-04-08 19:38:14 +08001713 struct iio_dev *iio_dev;
1714 int ret;
Grygorii Strashko9dabaf52013-07-18 11:19:00 +01001715
Alexandru Ardelean78289b42020-06-03 14:40:18 +03001716 iio_dev = iio_device_alloc(parent, sizeof_priv);
Yicong Yangcf5724e2021-04-08 19:38:14 +08001717 if (!iio_dev)
1718 return NULL;
1719
1720 ret = devm_add_action_or_reset(parent, devm_iio_device_release,
1721 iio_dev);
1722 if (ret)
Dan Carpenter43fa7392021-05-15 12:56:39 +03001723 return NULL;
Grygorii Strashko9dabaf52013-07-18 11:19:00 +01001724
1725 return iio_dev;
1726}
1727EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1728
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001729/**
Jonathan Cameron14555b12011-09-21 11:15:57 +01001730 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
Cristina Opriceana2498dcf2015-07-24 16:16:19 +03001731 * @inode: Inode structure for identifying the device in the file system
1732 * @filp: File structure for iio device used to keep and later access
1733 * private data
1734 *
1735 * Return: 0 on success or -EBUSY if the device is already opened
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001736 **/
1737static int iio_chrdev_open(struct inode *inode, struct file *filp)
1738{
Jonathan Cameron396f7232021-04-26 18:49:09 +01001739 struct iio_dev_opaque *iio_dev_opaque =
1740 container_of(inode->i_cdev, struct iio_dev_opaque, chrdev);
1741 struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev;
Alexandru Ardeleanbe24dcb2021-02-15 12:40:35 +02001742 struct iio_dev_buffer_pair *ib;
Lars-Peter Clausenbb014432011-12-19 15:23:45 +01001743
Jonathan Cameron8b1c82c2021-04-26 18:49:10 +01001744 if (test_and_set_bit(IIO_BUSY_BIT_POS, &iio_dev_opaque->flags))
Lars-Peter Clausenbb014432011-12-19 15:23:45 +01001745 return -EBUSY;
1746
Lars-Peter Clausencadc2122013-09-18 21:02:00 +01001747 iio_device_get(indio_dev);
1748
Alexandru Ardeleanbe24dcb2021-02-15 12:40:35 +02001749 ib = kmalloc(sizeof(*ib), GFP_KERNEL);
1750 if (!ib) {
1751 iio_device_put(indio_dev);
Jonathan Cameron8b1c82c2021-04-26 18:49:10 +01001752 clear_bit(IIO_BUSY_BIT_POS, &iio_dev_opaque->flags);
Alexandru Ardeleanbe24dcb2021-02-15 12:40:35 +02001753 return -ENOMEM;
1754 }
1755
1756 ib->indio_dev = indio_dev;
1757 ib->buffer = indio_dev->buffer;
1758
1759 filp->private_data = ib;
Jonathan Cameron30eb82f2011-09-21 11:16:02 +01001760
Lars-Peter Clausen79335142011-12-19 15:23:49 +01001761 return 0;
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001762}
1763
1764/**
Jonathan Cameron14555b12011-09-21 11:15:57 +01001765 * iio_chrdev_release() - chrdev file close buffer access and ioctls
Cristina Opriceana2498dcf2015-07-24 16:16:19 +03001766 * @inode: Inode structure pointer for the char device
1767 * @filp: File structure pointer for the char device
1768 *
1769 * Return: 0 for successful release
1770 */
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001771static int iio_chrdev_release(struct inode *inode, struct file *filp)
1772{
Alexandru Ardeleanbe24dcb2021-02-15 12:40:35 +02001773 struct iio_dev_buffer_pair *ib = filp->private_data;
Jonathan Cameron396f7232021-04-26 18:49:09 +01001774 struct iio_dev_opaque *iio_dev_opaque =
1775 container_of(inode->i_cdev, struct iio_dev_opaque, chrdev);
1776 struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev;
Alexandru Ardeleanbe24dcb2021-02-15 12:40:35 +02001777 kfree(ib);
Jonathan Cameron8b1c82c2021-04-26 18:49:10 +01001778 clear_bit(IIO_BUSY_BIT_POS, &iio_dev_opaque->flags);
Lars-Peter Clausencadc2122013-09-18 21:02:00 +01001779 iio_device_put(indio_dev);
1780
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001781 return 0;
1782}
1783
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001784void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
1785 struct iio_ioctl_handler *h)
1786{
1787 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1788
1789 list_add_tail(&h->entry, &iio_dev_opaque->ioctl_handlers);
1790}
1791
1792void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h)
1793{
1794 list_del(&h->entry);
1795}
1796
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001797static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1798{
Alexandru Ardeleanbe24dcb2021-02-15 12:40:35 +02001799 struct iio_dev_buffer_pair *ib = filp->private_data;
1800 struct iio_dev *indio_dev = ib->indio_dev;
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001801 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1802 struct iio_ioctl_handler *h;
1803 int ret = -ENODEV;
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001804
Jonathan Cameronb804e2b2021-04-26 18:49:08 +01001805 mutex_lock(&iio_dev_opaque->info_exist_lock);
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001806
1807 /**
1808 * The NULL check here is required to prevent crashing when a device
1809 * is being removed while userspace would still have open file handles
1810 * to try to access this device.
1811 */
Lars-Peter Clausenf18e7a02013-10-04 12:06:00 +01001812 if (!indio_dev->info)
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001813 goto out_unlock;
Lars-Peter Clausenf18e7a02013-10-04 12:06:00 +01001814
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001815 list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) {
1816 ret = h->ioctl(indio_dev, filp, cmd, arg);
1817 if (ret != IIO_IOCTL_UNHANDLED)
1818 break;
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001819 }
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001820
Alexandru Ardelean74d826d2020-11-17 11:51:54 +02001821 if (ret == IIO_IOCTL_UNHANDLED)
Alexandru Ardeleanaf0670b2021-05-03 17:43:50 +03001822 ret = -ENODEV;
Alexandru Ardelean74d826d2020-11-17 11:51:54 +02001823
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001824out_unlock:
Jonathan Cameronb804e2b2021-04-26 18:49:08 +01001825 mutex_unlock(&iio_dev_opaque->info_exist_lock);
Alexandru Ardelean8dedcc32020-09-24 11:41:55 +03001826
1827 return ret;
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001828}
1829
Jonathan Cameron14555b12011-09-21 11:15:57 +01001830static const struct file_operations iio_buffer_fileops = {
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001831 .owner = THIS_MODULE,
1832 .llseek = noop_llseek,
Alexandru Ardeleanee8caea2020-11-17 12:37:53 +02001833 .read = iio_buffer_read_outer_addr,
Mihail Chindris9eeee3b2021-10-07 08:00:30 +00001834 .write = iio_buffer_write_outer_addr,
Alexandru Ardeleanee8caea2020-11-17 12:37:53 +02001835 .poll = iio_buffer_poll_addr,
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001836 .unlocked_ioctl = iio_ioctl,
Arnd Bergmann1832f2d2018-09-11 21:59:08 +02001837 .compat_ioctl = compat_ptr_ioctl,
Alexandru Ardeleanee8caea2020-11-17 12:37:53 +02001838 .open = iio_chrdev_open,
1839 .release = iio_chrdev_release,
Jonathan Cameron1aa04272011-08-30 12:32:47 +01001840};
1841
Alexandru Ardelean8ebaa3f2021-02-15 12:40:27 +02001842static const struct file_operations iio_event_fileops = {
1843 .owner = THIS_MODULE,
1844 .llseek = noop_llseek,
1845 .unlocked_ioctl = iio_ioctl,
1846 .compat_ioctl = compat_ptr_ioctl,
1847 .open = iio_chrdev_open,
1848 .release = iio_chrdev_release,
1849};
1850
Vlad Dogaru8f5d8722014-12-29 11:37:48 +02001851static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1852{
1853 int i, j;
1854 const struct iio_chan_spec *channels = indio_dev->channels;
1855
1856 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1857 return 0;
1858
1859 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1860 if (channels[i].scan_index < 0)
1861 continue;
1862 for (j = i + 1; j < indio_dev->num_channels; j++)
1863 if (channels[i].scan_index == channels[j].scan_index) {
1864 dev_err(&indio_dev->dev,
1865 "Duplicate scan index %d\n",
1866 channels[i].scan_index);
1867 return -EINVAL;
1868 }
1869 }
1870
1871 return 0;
1872}
1873
Paul Cercueil0e0761f2021-06-18 13:30:04 +01001874static int iio_check_extended_name(const struct iio_dev *indio_dev)
1875{
1876 unsigned int i;
1877
1878 if (!indio_dev->info->read_label)
1879 return 0;
1880
1881 for (i = 0; i < indio_dev->num_channels; i++) {
1882 if (indio_dev->channels[i].extend_name) {
1883 dev_err(&indio_dev->dev,
1884 "Cannot use labels and extend_name at the same time\n");
1885 return -EINVAL;
1886 }
1887 }
1888
1889 return 0;
1890}
1891
Michael Hennerich0f1acee2012-03-01 10:51:04 +01001892static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1893
Jonathan Cameron63b19542017-07-23 17:25:43 +01001894int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
Jonathan Cameron847ec802009-08-18 18:06:19 +01001895{
Alexandru Ardelean8ebaa3f2021-02-15 12:40:27 +02001896 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
Hans de Goede6f71bf12021-02-07 17:08:59 +01001897 const char *label;
Jonathan Cameron847ec802009-08-18 18:06:19 +01001898 int ret;
1899
Alexandru Ardeleana17cb782020-04-07 18:07:43 +03001900 if (!indio_dev->info)
1901 return -EINVAL;
1902
Jonathan Cameron6eaf9f62021-04-26 18:49:05 +01001903 iio_dev_opaque->driver_module = this_mod;
Guenter Roeck17d82b42013-02-07 17:09:00 +00001904 /* If the calling driver did not initialize of_node, do it here */
1905 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1906 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1907
Hans de Goede6f71bf12021-02-07 17:08:59 +01001908 label = of_get_property(indio_dev->dev.of_node, "label", NULL);
1909 if (label)
1910 indio_dev->label = label;
Phil Reid2c3d0c92019-09-19 22:36:08 +08001911
Vlad Dogaru8f5d8722014-12-29 11:37:48 +02001912 ret = iio_check_unique_scan_index(indio_dev);
1913 if (ret < 0)
1914 return ret;
1915
Paul Cercueil0e0761f2021-06-18 13:30:04 +01001916 ret = iio_check_extended_name(indio_dev);
1917 if (ret < 0)
1918 return ret;
1919
Greg Kroah-Hartman8915aac2019-06-18 17:54:40 +02001920 iio_device_register_debugfs(indio_dev);
Lars-Peter Clausen3e1b6c92014-11-26 18:55:12 +01001921
Alexandru Ardeleanee708e62021-02-15 12:40:38 +02001922 ret = iio_buffers_alloc_sysfs_and_mask(indio_dev);
Lars-Peter Clausen3e1b6c92014-11-26 18:55:12 +01001923 if (ret) {
1924 dev_err(indio_dev->dev.parent,
1925 "Failed to create buffer sysfs interfaces\n");
1926 goto error_unreg_debugfs;
1927 }
1928
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001929 ret = iio_device_register_sysfs(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001930 if (ret) {
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001931 dev_err(indio_dev->dev.parent,
Jonathan Cameron847ec802009-08-18 18:06:19 +01001932 "Failed to register sysfs interfaces\n");
Lars-Peter Clausen3e1b6c92014-11-26 18:55:12 +01001933 goto error_buffer_free_sysfs;
Jonathan Cameron847ec802009-08-18 18:06:19 +01001934 }
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001935 ret = iio_device_register_eventset(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001936 if (ret) {
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001937 dev_err(indio_dev->dev.parent,
Roel Van Nyenc849d252010-04-29 19:27:31 +02001938 "Failed to register event set\n");
Jonathan Cameron847ec802009-08-18 18:06:19 +01001939 goto error_free_sysfs;
1940 }
Benjamin Gaignardd89e1192017-04-27 15:29:15 +02001941 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001942 iio_device_register_trigger_consumer(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001943
Michael Hennerich0f1acee2012-03-01 10:51:04 +01001944 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1945 indio_dev->setup_ops == NULL)
1946 indio_dev->setup_ops = &noop_ring_setup_ops;
1947
Alexandru Ardeleanee708e62021-02-15 12:40:38 +02001948 if (iio_dev_opaque->attached_buffers_cnt)
Jonathan Cameron396f7232021-04-26 18:49:09 +01001949 cdev_init(&iio_dev_opaque->chrdev, &iio_buffer_fileops);
Alexandru Ardelean8ebaa3f2021-02-15 12:40:27 +02001950 else if (iio_dev_opaque->event_interface)
Jonathan Cameron396f7232021-04-26 18:49:09 +01001951 cdev_init(&iio_dev_opaque->chrdev, &iio_event_fileops);
Jonathan Cameron63b19542017-07-23 17:25:43 +01001952
Alexandru Ardeleanee708e62021-02-15 12:40:38 +02001953 if (iio_dev_opaque->attached_buffers_cnt || iio_dev_opaque->event_interface) {
Jonathan Cameron15ea28782021-04-26 18:49:03 +01001954 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), iio_dev_opaque->id);
Jonathan Cameron396f7232021-04-26 18:49:09 +01001955 iio_dev_opaque->chrdev.owner = this_mod;
Alexandru Ardelean8ebaa3f2021-02-15 12:40:27 +02001956 }
Logan Gunthorpe389239112017-03-17 12:48:17 -06001957
Alexandru Ardelean32f17172021-02-15 12:40:29 +02001958 /* assign device groups now; they should be all registered now */
1959 indio_dev->dev.groups = iio_dev_opaque->groups;
1960
Jonathan Cameron396f7232021-04-26 18:49:09 +01001961 ret = cdev_device_add(&iio_dev_opaque->chrdev, &indio_dev->dev);
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001962 if (ret < 0)
Lars-Peter Clausen0d5b7da2013-09-18 21:02:00 +01001963 goto error_unreg_eventset;
Jonathan Cameron847ec802009-08-18 18:06:19 +01001964
Lars-Peter Clausen0d5b7da2013-09-18 21:02:00 +01001965 return 0;
Logan Gunthorpe389239112017-03-17 12:48:17 -06001966
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001967error_unreg_eventset:
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001968 iio_device_unregister_eventset(indio_dev);
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001969error_free_sysfs:
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001970 iio_device_unregister_sysfs(indio_dev);
Lars-Peter Clausen3e1b6c92014-11-26 18:55:12 +01001971error_buffer_free_sysfs:
Alexandru Ardeleanee708e62021-02-15 12:40:38 +02001972 iio_buffers_free_sysfs_and_mask(indio_dev);
Michael Henneriche553f182012-03-01 10:51:03 +01001973error_unreg_debugfs:
1974 iio_device_unregister_debugfs(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001975 return ret;
1976}
Jonathan Cameron63b19542017-07-23 17:25:43 +01001977EXPORT_SYMBOL(__iio_device_register);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001978
Sachin Kamata7e57dc2013-10-29 11:39:00 +00001979/**
1980 * iio_device_unregister() - unregister a device from the IIO subsystem
1981 * @indio_dev: Device structure representing the device.
1982 **/
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001983void iio_device_unregister(struct iio_dev *indio_dev)
Jonathan Cameron847ec802009-08-18 18:06:19 +01001984{
Jonathan Cameron396f7232021-04-26 18:49:09 +01001985 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1986
1987 cdev_device_del(&iio_dev_opaque->chrdev, &indio_dev->dev);
Lars-Peter Clausena87c82e2013-09-18 21:02:00 +01001988
Jonathan Cameronb804e2b2021-04-26 18:49:08 +01001989 mutex_lock(&iio_dev_opaque->info_exist_lock);
Fabrice Gasnier7f75591fc2019-03-25 14:01:23 +01001990
Lars-Peter Clausenbc4c9612013-09-21 16:21:00 +01001991 iio_device_unregister_debugfs(indio_dev);
Lars-Peter Clausen0d5b7da2013-09-18 21:02:00 +01001992
Lars-Peter Clausena87c82e2013-09-18 21:02:00 +01001993 iio_disable_all_buffers(indio_dev);
1994
Jonathan Cameronac917a82012-02-15 19:48:00 +00001995 indio_dev->info = NULL;
Lars-Peter Clausend2f0a482013-10-04 12:07:00 +01001996
1997 iio_device_wakeup_eventset(indio_dev);
1998 iio_buffer_wakeup_poll(indio_dev);
1999
Jonathan Cameronb804e2b2021-04-26 18:49:08 +01002000 mutex_unlock(&iio_dev_opaque->info_exist_lock);
Lars-Peter Clausen3e1b6c92014-11-26 18:55:12 +01002001
Alexandru Ardeleanee708e62021-02-15 12:40:38 +02002002 iio_buffers_free_sysfs_and_mask(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01002003}
2004EXPORT_SYMBOL(iio_device_unregister);
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002005
Yicong Yangcf5724e2021-04-08 19:38:14 +08002006static void devm_iio_device_unreg(void *indio_dev)
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002007{
Yicong Yangcf5724e2021-04-08 19:38:14 +08002008 iio_device_unregister(indio_dev);
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002009}
2010
Jonathan Cameron63b19542017-07-23 17:25:43 +01002011int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
2012 struct module *this_mod)
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002013{
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002014 int ret;
2015
Jonathan Cameron63b19542017-07-23 17:25:43 +01002016 ret = __iio_device_register(indio_dev, this_mod);
Yicong Yangcf5724e2021-04-08 19:38:14 +08002017 if (ret)
2018 return ret;
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002019
Yicong Yangcf5724e2021-04-08 19:38:14 +08002020 return devm_add_action_or_reset(dev, devm_iio_device_unreg, indio_dev);
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002021}
Jonathan Cameron63b19542017-07-23 17:25:43 +01002022EXPORT_SYMBOL_GPL(__devm_iio_device_register);
Sachin Kamat8caa07c2013-10-29 11:39:00 +00002023
2024/**
Alison Schofield08a33802016-03-09 11:30:12 -08002025 * iio_device_claim_direct_mode - Keep device in direct mode
2026 * @indio_dev: the iio_dev associated with the device
2027 *
2028 * If the device is in direct mode it is guaranteed to stay
2029 * that way until iio_device_release_direct_mode() is called.
2030 *
2031 * Use with iio_device_release_direct_mode()
2032 *
2033 * Returns: 0 on success, -EBUSY on failure
2034 */
2035int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
2036{
2037 mutex_lock(&indio_dev->mlock);
2038
2039 if (iio_buffer_enabled(indio_dev)) {
2040 mutex_unlock(&indio_dev->mlock);
2041 return -EBUSY;
2042 }
2043 return 0;
2044}
2045EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
2046
2047/**
2048 * iio_device_release_direct_mode - releases claim on direct mode
2049 * @indio_dev: the iio_dev associated with the device
2050 *
2051 * Release the claim. Device is no longer guaranteed to stay
2052 * in direct mode.
2053 *
2054 * Use with iio_device_claim_direct_mode()
2055 */
2056void iio_device_release_direct_mode(struct iio_dev *indio_dev)
2057{
2058 mutex_unlock(&indio_dev->mlock);
2059}
2060EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
2061
Jonathan Cameron847ec802009-08-18 18:06:19 +01002062subsys_initcall(iio_init);
2063module_exit(iio_exit);
2064
Jonathan Cameronc8b95952012-09-02 21:27:56 +01002065MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
Jonathan Cameron847ec802009-08-18 18:06:19 +01002066MODULE_DESCRIPTION("Industrial I/O core");
2067MODULE_LICENSE("GPL");