Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2014 Intel Corporation |
| 4 | * |
| 5 | * Driver for Semtech's SX9500 capacitive proximity/button solution. |
| 6 | * Datasheet available at |
| 7 | * <http://www.semtech.com/images/datasheet/sx9500.pdf>. |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/i2c.h> |
| 14 | #include <linux/irq.h> |
| 15 | #include <linux/acpi.h> |
| 16 | #include <linux/gpio/consumer.h> |
| 17 | #include <linux/regmap.h> |
Vlad Dogaru | 7840ffe | 2015-04-03 15:47:29 +0300 | [diff] [blame] | 18 | #include <linux/pm.h> |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 19 | #include <linux/delay.h> |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 20 | |
| 21 | #include <linux/iio/iio.h> |
| 22 | #include <linux/iio/buffer.h> |
| 23 | #include <linux/iio/sysfs.h> |
| 24 | #include <linux/iio/events.h> |
| 25 | #include <linux/iio/trigger.h> |
| 26 | #include <linux/iio/triggered_buffer.h> |
| 27 | #include <linux/iio/trigger_consumer.h> |
| 28 | |
| 29 | #define SX9500_DRIVER_NAME "sx9500" |
| 30 | #define SX9500_IRQ_NAME "sx9500_event" |
Vlad Dogaru | 63de9f9 | 2015-04-03 15:47:31 +0300 | [diff] [blame] | 31 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 32 | /* Register definitions. */ |
| 33 | #define SX9500_REG_IRQ_SRC 0x00 |
| 34 | #define SX9500_REG_STAT 0x01 |
| 35 | #define SX9500_REG_IRQ_MSK 0x03 |
| 36 | |
| 37 | #define SX9500_REG_PROX_CTRL0 0x06 |
| 38 | #define SX9500_REG_PROX_CTRL1 0x07 |
| 39 | #define SX9500_REG_PROX_CTRL2 0x08 |
| 40 | #define SX9500_REG_PROX_CTRL3 0x09 |
| 41 | #define SX9500_REG_PROX_CTRL4 0x0a |
| 42 | #define SX9500_REG_PROX_CTRL5 0x0b |
| 43 | #define SX9500_REG_PROX_CTRL6 0x0c |
| 44 | #define SX9500_REG_PROX_CTRL7 0x0d |
| 45 | #define SX9500_REG_PROX_CTRL8 0x0e |
| 46 | |
| 47 | #define SX9500_REG_SENSOR_SEL 0x20 |
| 48 | #define SX9500_REG_USE_MSB 0x21 |
| 49 | #define SX9500_REG_USE_LSB 0x22 |
| 50 | #define SX9500_REG_AVG_MSB 0x23 |
| 51 | #define SX9500_REG_AVG_LSB 0x24 |
| 52 | #define SX9500_REG_DIFF_MSB 0x25 |
| 53 | #define SX9500_REG_DIFF_LSB 0x26 |
| 54 | #define SX9500_REG_OFFSET_MSB 0x27 |
| 55 | #define SX9500_REG_OFFSET_LSB 0x28 |
| 56 | |
| 57 | #define SX9500_REG_RESET 0x7f |
| 58 | |
| 59 | /* Write this to REG_RESET to do a soft reset. */ |
| 60 | #define SX9500_SOFT_RESET 0xde |
| 61 | |
| 62 | #define SX9500_SCAN_PERIOD_MASK GENMASK(6, 4) |
| 63 | #define SX9500_SCAN_PERIOD_SHIFT 4 |
| 64 | |
| 65 | /* |
| 66 | * These serve for identifying IRQ source in the IRQ_SRC register, and |
| 67 | * also for masking the IRQs in the IRQ_MSK register. |
| 68 | */ |
| 69 | #define SX9500_CLOSE_IRQ BIT(6) |
| 70 | #define SX9500_FAR_IRQ BIT(5) |
| 71 | #define SX9500_CONVDONE_IRQ BIT(3) |
| 72 | |
| 73 | #define SX9500_PROXSTAT_SHIFT 4 |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 74 | #define SX9500_COMPSTAT_MASK GENMASK(3, 0) |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 75 | |
| 76 | #define SX9500_NUM_CHANNELS 4 |
Vlad Dogaru | 68958bd | 2015-06-30 14:20:59 +0300 | [diff] [blame] | 77 | #define SX9500_CHAN_MASK GENMASK(SX9500_NUM_CHANNELS - 1, 0) |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 78 | |
| 79 | struct sx9500_data { |
| 80 | struct mutex mutex; |
| 81 | struct i2c_client *client; |
| 82 | struct iio_trigger *trig; |
| 83 | struct regmap *regmap; |
Vlad Dogaru | 45fd5f8 | 2015-04-12 20:09:21 +0300 | [diff] [blame] | 84 | struct gpio_desc *gpiod_rst; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 85 | /* |
| 86 | * Last reading of the proximity status for each channel. We |
| 87 | * only send an event to user space when this changes. |
| 88 | */ |
| 89 | bool prox_stat[SX9500_NUM_CHANNELS]; |
| 90 | bool event_enabled[SX9500_NUM_CHANNELS]; |
| 91 | bool trigger_enabled; |
| 92 | u16 *buffer; |
Vlad Dogaru | 7840ffe | 2015-04-03 15:47:29 +0300 | [diff] [blame] | 93 | /* Remember enabled channels and sample rate during suspend. */ |
| 94 | unsigned int suspend_ctrl0; |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 95 | struct completion completion; |
| 96 | int data_rdy_users, close_far_users; |
| 97 | int channel_users[SX9500_NUM_CHANNELS]; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | static const struct iio_event_spec sx9500_events[] = { |
| 101 | { |
| 102 | .type = IIO_EV_TYPE_THRESH, |
| 103 | .dir = IIO_EV_DIR_EITHER, |
| 104 | .mask_separate = BIT(IIO_EV_INFO_ENABLE), |
| 105 | }, |
| 106 | }; |
| 107 | |
| 108 | #define SX9500_CHANNEL(idx) \ |
| 109 | { \ |
| 110 | .type = IIO_PROXIMITY, \ |
| 111 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 112 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ |
| 113 | .indexed = 1, \ |
| 114 | .channel = idx, \ |
| 115 | .event_spec = sx9500_events, \ |
| 116 | .num_event_specs = ARRAY_SIZE(sx9500_events), \ |
| 117 | .scan_index = idx, \ |
| 118 | .scan_type = { \ |
| 119 | .sign = 'u', \ |
| 120 | .realbits = 16, \ |
| 121 | .storagebits = 16, \ |
| 122 | .shift = 0, \ |
| 123 | }, \ |
| 124 | } |
| 125 | |
| 126 | static const struct iio_chan_spec sx9500_channels[] = { |
| 127 | SX9500_CHANNEL(0), |
| 128 | SX9500_CHANNEL(1), |
| 129 | SX9500_CHANNEL(2), |
| 130 | SX9500_CHANNEL(3), |
| 131 | IIO_CHAN_SOFT_TIMESTAMP(4), |
| 132 | }; |
| 133 | |
| 134 | static const struct { |
| 135 | int val; |
| 136 | int val2; |
| 137 | } sx9500_samp_freq_table[] = { |
| 138 | {33, 333333}, |
| 139 | {16, 666666}, |
| 140 | {11, 111111}, |
| 141 | {8, 333333}, |
| 142 | {6, 666666}, |
| 143 | {5, 0}, |
| 144 | {3, 333333}, |
| 145 | {2, 500000}, |
| 146 | }; |
| 147 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 148 | static const unsigned int sx9500_scan_period_table[] = { |
| 149 | 30, 60, 90, 120, 150, 200, 300, 400, |
| 150 | }; |
| 151 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 152 | static const struct regmap_range sx9500_writable_reg_ranges[] = { |
| 153 | regmap_reg_range(SX9500_REG_IRQ_MSK, SX9500_REG_IRQ_MSK), |
| 154 | regmap_reg_range(SX9500_REG_PROX_CTRL0, SX9500_REG_PROX_CTRL8), |
| 155 | regmap_reg_range(SX9500_REG_SENSOR_SEL, SX9500_REG_SENSOR_SEL), |
| 156 | regmap_reg_range(SX9500_REG_OFFSET_MSB, SX9500_REG_OFFSET_LSB), |
| 157 | regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET), |
| 158 | }; |
| 159 | |
| 160 | static const struct regmap_access_table sx9500_writeable_regs = { |
| 161 | .yes_ranges = sx9500_writable_reg_ranges, |
| 162 | .n_yes_ranges = ARRAY_SIZE(sx9500_writable_reg_ranges), |
| 163 | }; |
| 164 | |
| 165 | /* |
| 166 | * All allocated registers are readable, so we just list unallocated |
| 167 | * ones. |
| 168 | */ |
| 169 | static const struct regmap_range sx9500_non_readable_reg_ranges[] = { |
| 170 | regmap_reg_range(SX9500_REG_STAT + 1, SX9500_REG_STAT + 1), |
| 171 | regmap_reg_range(SX9500_REG_IRQ_MSK + 1, SX9500_REG_PROX_CTRL0 - 1), |
| 172 | regmap_reg_range(SX9500_REG_PROX_CTRL8 + 1, SX9500_REG_SENSOR_SEL - 1), |
| 173 | regmap_reg_range(SX9500_REG_OFFSET_LSB + 1, SX9500_REG_RESET - 1), |
| 174 | }; |
| 175 | |
| 176 | static const struct regmap_access_table sx9500_readable_regs = { |
| 177 | .no_ranges = sx9500_non_readable_reg_ranges, |
| 178 | .n_no_ranges = ARRAY_SIZE(sx9500_non_readable_reg_ranges), |
| 179 | }; |
| 180 | |
| 181 | static const struct regmap_range sx9500_volatile_reg_ranges[] = { |
| 182 | regmap_reg_range(SX9500_REG_IRQ_SRC, SX9500_REG_STAT), |
| 183 | regmap_reg_range(SX9500_REG_USE_MSB, SX9500_REG_OFFSET_LSB), |
| 184 | regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET), |
| 185 | }; |
| 186 | |
| 187 | static const struct regmap_access_table sx9500_volatile_regs = { |
| 188 | .yes_ranges = sx9500_volatile_reg_ranges, |
| 189 | .n_yes_ranges = ARRAY_SIZE(sx9500_volatile_reg_ranges), |
| 190 | }; |
| 191 | |
| 192 | static const struct regmap_config sx9500_regmap_config = { |
| 193 | .reg_bits = 8, |
| 194 | .val_bits = 8, |
| 195 | |
| 196 | .max_register = SX9500_REG_RESET, |
| 197 | .cache_type = REGCACHE_RBTREE, |
| 198 | |
| 199 | .wr_table = &sx9500_writeable_regs, |
| 200 | .rd_table = &sx9500_readable_regs, |
| 201 | .volatile_table = &sx9500_volatile_regs, |
| 202 | }; |
| 203 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 204 | static int sx9500_inc_users(struct sx9500_data *data, int *counter, |
| 205 | unsigned int reg, unsigned int bitmask) |
| 206 | { |
| 207 | (*counter)++; |
| 208 | if (*counter != 1) |
| 209 | /* Bit is already active, nothing to do. */ |
| 210 | return 0; |
| 211 | |
| 212 | return regmap_update_bits(data->regmap, reg, bitmask, bitmask); |
| 213 | } |
| 214 | |
| 215 | static int sx9500_dec_users(struct sx9500_data *data, int *counter, |
| 216 | unsigned int reg, unsigned int bitmask) |
| 217 | { |
| 218 | (*counter)--; |
| 219 | if (*counter != 0) |
| 220 | /* There are more users, do not deactivate. */ |
| 221 | return 0; |
| 222 | |
| 223 | return regmap_update_bits(data->regmap, reg, bitmask, 0); |
| 224 | } |
| 225 | |
| 226 | static int sx9500_inc_chan_users(struct sx9500_data *data, int chan) |
| 227 | { |
| 228 | return sx9500_inc_users(data, &data->channel_users[chan], |
| 229 | SX9500_REG_PROX_CTRL0, BIT(chan)); |
| 230 | } |
| 231 | |
| 232 | static int sx9500_dec_chan_users(struct sx9500_data *data, int chan) |
| 233 | { |
| 234 | return sx9500_dec_users(data, &data->channel_users[chan], |
| 235 | SX9500_REG_PROX_CTRL0, BIT(chan)); |
| 236 | } |
| 237 | |
| 238 | static int sx9500_inc_data_rdy_users(struct sx9500_data *data) |
| 239 | { |
| 240 | return sx9500_inc_users(data, &data->data_rdy_users, |
| 241 | SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ); |
| 242 | } |
| 243 | |
| 244 | static int sx9500_dec_data_rdy_users(struct sx9500_data *data) |
| 245 | { |
| 246 | return sx9500_dec_users(data, &data->data_rdy_users, |
| 247 | SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ); |
| 248 | } |
| 249 | |
| 250 | static int sx9500_inc_close_far_users(struct sx9500_data *data) |
| 251 | { |
| 252 | return sx9500_inc_users(data, &data->close_far_users, |
| 253 | SX9500_REG_IRQ_MSK, |
| 254 | SX9500_CLOSE_IRQ | SX9500_FAR_IRQ); |
| 255 | } |
| 256 | |
| 257 | static int sx9500_dec_close_far_users(struct sx9500_data *data) |
| 258 | { |
| 259 | return sx9500_dec_users(data, &data->close_far_users, |
| 260 | SX9500_REG_IRQ_MSK, |
| 261 | SX9500_CLOSE_IRQ | SX9500_FAR_IRQ); |
| 262 | } |
| 263 | |
| 264 | static int sx9500_read_prox_data(struct sx9500_data *data, |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 265 | const struct iio_chan_spec *chan, |
| 266 | int *val) |
| 267 | { |
| 268 | int ret; |
| 269 | __be16 regval; |
| 270 | |
| 271 | ret = regmap_write(data->regmap, SX9500_REG_SENSOR_SEL, chan->channel); |
| 272 | if (ret < 0) |
| 273 | return ret; |
| 274 | |
| 275 | ret = regmap_bulk_read(data->regmap, SX9500_REG_USE_MSB, ®val, 2); |
| 276 | if (ret < 0) |
| 277 | return ret; |
| 278 | |
Daniel Baluta | fd1883f | 2015-06-11 18:49:34 +0300 | [diff] [blame] | 279 | *val = be16_to_cpu(regval); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 280 | |
| 281 | return IIO_VAL_INT; |
| 282 | } |
| 283 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 284 | /* |
| 285 | * If we have no interrupt support, we have to wait for a scan period |
| 286 | * after enabling a channel to get a result. |
| 287 | */ |
| 288 | static int sx9500_wait_for_sample(struct sx9500_data *data) |
| 289 | { |
| 290 | int ret; |
| 291 | unsigned int val; |
| 292 | |
| 293 | ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, &val); |
| 294 | if (ret < 0) |
| 295 | return ret; |
| 296 | |
| 297 | val = (val & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT; |
| 298 | |
| 299 | msleep(sx9500_scan_period_table[val]); |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | static int sx9500_read_proximity(struct sx9500_data *data, |
| 305 | const struct iio_chan_spec *chan, |
| 306 | int *val) |
| 307 | { |
| 308 | int ret; |
| 309 | |
| 310 | mutex_lock(&data->mutex); |
| 311 | |
| 312 | ret = sx9500_inc_chan_users(data, chan->channel); |
| 313 | if (ret < 0) |
| 314 | goto out; |
| 315 | |
| 316 | ret = sx9500_inc_data_rdy_users(data); |
| 317 | if (ret < 0) |
| 318 | goto out_dec_chan; |
| 319 | |
| 320 | mutex_unlock(&data->mutex); |
| 321 | |
| 322 | if (data->client->irq > 0) |
| 323 | ret = wait_for_completion_interruptible(&data->completion); |
| 324 | else |
| 325 | ret = sx9500_wait_for_sample(data); |
| 326 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 327 | mutex_lock(&data->mutex); |
| 328 | |
Vlad Dogaru | 657c7ff | 2015-06-30 14:20:58 +0300 | [diff] [blame] | 329 | if (ret < 0) |
| 330 | goto out_dec_data_rdy; |
| 331 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 332 | ret = sx9500_read_prox_data(data, chan, val); |
| 333 | if (ret < 0) |
Vlad Dogaru | 657c7ff | 2015-06-30 14:20:58 +0300 | [diff] [blame] | 334 | goto out_dec_data_rdy; |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 335 | |
| 336 | ret = sx9500_dec_data_rdy_users(data); |
| 337 | if (ret < 0) |
Vlad Dogaru | 657c7ff | 2015-06-30 14:20:58 +0300 | [diff] [blame] | 338 | goto out_dec_chan; |
| 339 | |
| 340 | ret = sx9500_dec_chan_users(data, chan->channel); |
| 341 | if (ret < 0) |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 342 | goto out; |
| 343 | |
| 344 | ret = IIO_VAL_INT; |
| 345 | |
| 346 | goto out; |
| 347 | |
Vlad Dogaru | 657c7ff | 2015-06-30 14:20:58 +0300 | [diff] [blame] | 348 | out_dec_data_rdy: |
| 349 | sx9500_dec_data_rdy_users(data); |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 350 | out_dec_chan: |
| 351 | sx9500_dec_chan_users(data, chan->channel); |
| 352 | out: |
| 353 | mutex_unlock(&data->mutex); |
| 354 | reinit_completion(&data->completion); |
| 355 | |
| 356 | return ret; |
| 357 | } |
| 358 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 359 | static int sx9500_read_samp_freq(struct sx9500_data *data, |
| 360 | int *val, int *val2) |
| 361 | { |
| 362 | int ret; |
| 363 | unsigned int regval; |
| 364 | |
| 365 | mutex_lock(&data->mutex); |
| 366 | ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, ®val); |
| 367 | mutex_unlock(&data->mutex); |
| 368 | |
| 369 | if (ret < 0) |
| 370 | return ret; |
| 371 | |
| 372 | regval = (regval & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT; |
| 373 | *val = sx9500_samp_freq_table[regval].val; |
| 374 | *val2 = sx9500_samp_freq_table[regval].val2; |
| 375 | |
| 376 | return IIO_VAL_INT_PLUS_MICRO; |
| 377 | } |
| 378 | |
| 379 | static int sx9500_read_raw(struct iio_dev *indio_dev, |
| 380 | const struct iio_chan_spec *chan, |
| 381 | int *val, int *val2, long mask) |
| 382 | { |
| 383 | struct sx9500_data *data = iio_priv(indio_dev); |
Alison Schofield | 6b2e758 | 2017-01-20 14:11:30 -0800 | [diff] [blame] | 384 | int ret; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 385 | |
| 386 | switch (chan->type) { |
| 387 | case IIO_PROXIMITY: |
| 388 | switch (mask) { |
| 389 | case IIO_CHAN_INFO_RAW: |
Alison Schofield | 6b2e758 | 2017-01-20 14:11:30 -0800 | [diff] [blame] | 390 | ret = iio_device_claim_direct_mode(indio_dev); |
| 391 | if (ret) |
| 392 | return ret; |
| 393 | ret = sx9500_read_proximity(data, chan, val); |
| 394 | iio_device_release_direct_mode(indio_dev); |
| 395 | return ret; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 396 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 397 | return sx9500_read_samp_freq(data, val, val2); |
| 398 | default: |
| 399 | return -EINVAL; |
| 400 | } |
| 401 | default: |
| 402 | return -EINVAL; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | static int sx9500_set_samp_freq(struct sx9500_data *data, |
| 407 | int val, int val2) |
| 408 | { |
| 409 | int i, ret; |
| 410 | |
| 411 | for (i = 0; i < ARRAY_SIZE(sx9500_samp_freq_table); i++) |
| 412 | if (val == sx9500_samp_freq_table[i].val && |
| 413 | val2 == sx9500_samp_freq_table[i].val2) |
| 414 | break; |
| 415 | |
| 416 | if (i == ARRAY_SIZE(sx9500_samp_freq_table)) |
| 417 | return -EINVAL; |
| 418 | |
| 419 | mutex_lock(&data->mutex); |
| 420 | |
| 421 | ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0, |
| 422 | SX9500_SCAN_PERIOD_MASK, |
| 423 | i << SX9500_SCAN_PERIOD_SHIFT); |
| 424 | |
| 425 | mutex_unlock(&data->mutex); |
| 426 | |
| 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | static int sx9500_write_raw(struct iio_dev *indio_dev, |
| 431 | const struct iio_chan_spec *chan, |
| 432 | int val, int val2, long mask) |
| 433 | { |
| 434 | struct sx9500_data *data = iio_priv(indio_dev); |
| 435 | |
| 436 | switch (chan->type) { |
| 437 | case IIO_PROXIMITY: |
| 438 | switch (mask) { |
| 439 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 440 | return sx9500_set_samp_freq(data, val, val2); |
| 441 | default: |
| 442 | return -EINVAL; |
| 443 | } |
| 444 | default: |
| 445 | return -EINVAL; |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | static irqreturn_t sx9500_irq_handler(int irq, void *private) |
| 450 | { |
| 451 | struct iio_dev *indio_dev = private; |
| 452 | struct sx9500_data *data = iio_priv(indio_dev); |
| 453 | |
| 454 | if (data->trigger_enabled) |
| 455 | iio_trigger_poll(data->trig); |
| 456 | |
| 457 | /* |
| 458 | * Even if no event is enabled, we need to wake the thread to |
| 459 | * clear the interrupt state by reading SX9500_REG_IRQ_SRC. It |
| 460 | * is not possible to do that here because regmap_read takes a |
| 461 | * mutex. |
| 462 | */ |
| 463 | return IRQ_WAKE_THREAD; |
| 464 | } |
| 465 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 466 | static void sx9500_push_events(struct iio_dev *indio_dev) |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 467 | { |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 468 | int ret; |
| 469 | unsigned int val, chan; |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 470 | struct sx9500_data *data = iio_priv(indio_dev); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 471 | |
| 472 | ret = regmap_read(data->regmap, SX9500_REG_STAT, &val); |
| 473 | if (ret < 0) { |
| 474 | dev_err(&data->client->dev, "i2c transfer error in irq\n"); |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 475 | return; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | val >>= SX9500_PROXSTAT_SHIFT; |
| 479 | for (chan = 0; chan < SX9500_NUM_CHANNELS; chan++) { |
| 480 | int dir; |
| 481 | u64 ev; |
| 482 | bool new_prox = val & BIT(chan); |
| 483 | |
| 484 | if (!data->event_enabled[chan]) |
| 485 | continue; |
| 486 | if (new_prox == data->prox_stat[chan]) |
| 487 | /* No change on this channel. */ |
| 488 | continue; |
| 489 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 490 | dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING; |
| 491 | ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan, |
| 492 | IIO_EV_TYPE_THRESH, dir); |
Gregor Boirie | bc2b7da | 2016-03-09 19:05:49 +0100 | [diff] [blame] | 493 | iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev)); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 494 | data->prox_stat[chan] = new_prox; |
| 495 | } |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | static irqreturn_t sx9500_irq_thread_handler(int irq, void *private) |
| 499 | { |
| 500 | struct iio_dev *indio_dev = private; |
| 501 | struct sx9500_data *data = iio_priv(indio_dev); |
| 502 | int ret; |
| 503 | unsigned int val; |
| 504 | |
| 505 | mutex_lock(&data->mutex); |
| 506 | |
| 507 | ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val); |
| 508 | if (ret < 0) { |
| 509 | dev_err(&data->client->dev, "i2c transfer error in irq\n"); |
| 510 | goto out; |
| 511 | } |
| 512 | |
| 513 | if (val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ)) |
| 514 | sx9500_push_events(indio_dev); |
| 515 | |
| 516 | if (val & SX9500_CONVDONE_IRQ) |
Daniel Wagner | 8c11e16 | 2016-08-04 15:07:10 +0200 | [diff] [blame] | 517 | complete(&data->completion); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 518 | |
| 519 | out: |
| 520 | mutex_unlock(&data->mutex); |
| 521 | |
| 522 | return IRQ_HANDLED; |
| 523 | } |
| 524 | |
| 525 | static int sx9500_read_event_config(struct iio_dev *indio_dev, |
| 526 | const struct iio_chan_spec *chan, |
| 527 | enum iio_event_type type, |
| 528 | enum iio_event_direction dir) |
| 529 | { |
| 530 | struct sx9500_data *data = iio_priv(indio_dev); |
| 531 | |
| 532 | if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH || |
| 533 | dir != IIO_EV_DIR_EITHER) |
| 534 | return -EINVAL; |
| 535 | |
| 536 | return data->event_enabled[chan->channel]; |
| 537 | } |
| 538 | |
| 539 | static int sx9500_write_event_config(struct iio_dev *indio_dev, |
| 540 | const struct iio_chan_spec *chan, |
| 541 | enum iio_event_type type, |
| 542 | enum iio_event_direction dir, |
| 543 | int state) |
| 544 | { |
| 545 | struct sx9500_data *data = iio_priv(indio_dev); |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 546 | int ret; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 547 | |
| 548 | if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH || |
| 549 | dir != IIO_EV_DIR_EITHER) |
| 550 | return -EINVAL; |
| 551 | |
| 552 | mutex_lock(&data->mutex); |
| 553 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 554 | if (state == 1) { |
| 555 | ret = sx9500_inc_chan_users(data, chan->channel); |
| 556 | if (ret < 0) |
| 557 | goto out_unlock; |
| 558 | ret = sx9500_inc_close_far_users(data); |
| 559 | if (ret < 0) |
| 560 | goto out_undo_chan; |
| 561 | } else { |
| 562 | ret = sx9500_dec_chan_users(data, chan->channel); |
| 563 | if (ret < 0) |
| 564 | goto out_unlock; |
| 565 | ret = sx9500_dec_close_far_users(data); |
| 566 | if (ret < 0) |
| 567 | goto out_undo_chan; |
| 568 | } |
| 569 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 570 | data->event_enabled[chan->channel] = state; |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 571 | goto out_unlock; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 572 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 573 | out_undo_chan: |
| 574 | if (state == 1) |
| 575 | sx9500_dec_chan_users(data, chan->channel); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 576 | else |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 577 | sx9500_inc_chan_users(data, chan->channel); |
| 578 | out_unlock: |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 579 | mutex_unlock(&data->mutex); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 580 | return ret; |
| 581 | } |
| 582 | |
| 583 | static int sx9500_update_scan_mode(struct iio_dev *indio_dev, |
| 584 | const unsigned long *scan_mask) |
| 585 | { |
| 586 | struct sx9500_data *data = iio_priv(indio_dev); |
| 587 | |
| 588 | mutex_lock(&data->mutex); |
| 589 | kfree(data->buffer); |
| 590 | data->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL); |
| 591 | mutex_unlock(&data->mutex); |
| 592 | |
| 593 | if (data->buffer == NULL) |
| 594 | return -ENOMEM; |
| 595 | |
| 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( |
| 600 | "2.500000 3.333333 5 6.666666 8.333333 11.111111 16.666666 33.333333"); |
| 601 | |
| 602 | static struct attribute *sx9500_attributes[] = { |
| 603 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
| 604 | NULL, |
| 605 | }; |
| 606 | |
| 607 | static const struct attribute_group sx9500_attribute_group = { |
| 608 | .attrs = sx9500_attributes, |
| 609 | }; |
| 610 | |
| 611 | static const struct iio_info sx9500_info = { |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 612 | .attrs = &sx9500_attribute_group, |
| 613 | .read_raw = &sx9500_read_raw, |
| 614 | .write_raw = &sx9500_write_raw, |
| 615 | .read_event_config = &sx9500_read_event_config, |
| 616 | .write_event_config = &sx9500_write_event_config, |
| 617 | .update_scan_mode = &sx9500_update_scan_mode, |
| 618 | }; |
| 619 | |
| 620 | static int sx9500_set_trigger_state(struct iio_trigger *trig, |
| 621 | bool state) |
| 622 | { |
| 623 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| 624 | struct sx9500_data *data = iio_priv(indio_dev); |
| 625 | int ret; |
| 626 | |
| 627 | mutex_lock(&data->mutex); |
| 628 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 629 | if (state) |
| 630 | ret = sx9500_inc_data_rdy_users(data); |
| 631 | else |
| 632 | ret = sx9500_dec_data_rdy_users(data); |
| 633 | if (ret < 0) |
| 634 | goto out; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 635 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 636 | data->trigger_enabled = state; |
| 637 | |
| 638 | out: |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 639 | mutex_unlock(&data->mutex); |
| 640 | |
| 641 | return ret; |
| 642 | } |
| 643 | |
| 644 | static const struct iio_trigger_ops sx9500_trigger_ops = { |
| 645 | .set_trigger_state = sx9500_set_trigger_state, |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 646 | }; |
| 647 | |
| 648 | static irqreturn_t sx9500_trigger_handler(int irq, void *private) |
| 649 | { |
| 650 | struct iio_poll_func *pf = private; |
| 651 | struct iio_dev *indio_dev = pf->indio_dev; |
| 652 | struct sx9500_data *data = iio_priv(indio_dev); |
| 653 | int val, bit, ret, i = 0; |
| 654 | |
| 655 | mutex_lock(&data->mutex); |
| 656 | |
Octavian Purdila | 70dddee | 2015-03-02 21:03:05 +0200 | [diff] [blame] | 657 | for_each_set_bit(bit, indio_dev->active_scan_mask, |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 658 | indio_dev->masklength) { |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 659 | ret = sx9500_read_prox_data(data, &indio_dev->channels[bit], |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 660 | &val); |
| 661 | if (ret < 0) |
| 662 | goto out; |
| 663 | |
| 664 | data->buffer[i++] = val; |
| 665 | } |
| 666 | |
| 667 | iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, |
Gregor Boirie | bc2b7da | 2016-03-09 19:05:49 +0100 | [diff] [blame] | 668 | iio_get_time_ns(indio_dev)); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 669 | |
| 670 | out: |
| 671 | mutex_unlock(&data->mutex); |
| 672 | |
| 673 | iio_trigger_notify_done(indio_dev->trig); |
| 674 | |
| 675 | return IRQ_HANDLED; |
| 676 | } |
| 677 | |
Alexandru Ardelean | 3cfd646 | 2019-09-20 11:35:13 +0300 | [diff] [blame] | 678 | static int sx9500_buffer_postenable(struct iio_dev *indio_dev) |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 679 | { |
| 680 | struct sx9500_data *data = iio_priv(indio_dev); |
Geert Uytterhoeven | 897993f | 2015-06-29 09:14:33 +0200 | [diff] [blame] | 681 | int ret = 0, i; |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 682 | |
| 683 | mutex_lock(&data->mutex); |
| 684 | |
| 685 | for (i = 0; i < SX9500_NUM_CHANNELS; i++) |
| 686 | if (test_bit(i, indio_dev->active_scan_mask)) { |
| 687 | ret = sx9500_inc_chan_users(data, i); |
| 688 | if (ret) |
| 689 | break; |
| 690 | } |
| 691 | |
| 692 | if (ret) |
| 693 | for (i = i - 1; i >= 0; i--) |
| 694 | if (test_bit(i, indio_dev->active_scan_mask)) |
| 695 | sx9500_dec_chan_users(data, i); |
| 696 | |
| 697 | mutex_unlock(&data->mutex); |
| 698 | |
| 699 | return ret; |
| 700 | } |
| 701 | |
| 702 | static int sx9500_buffer_predisable(struct iio_dev *indio_dev) |
| 703 | { |
| 704 | struct sx9500_data *data = iio_priv(indio_dev); |
Geert Uytterhoeven | 897993f | 2015-06-29 09:14:33 +0200 | [diff] [blame] | 705 | int ret = 0, i; |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 706 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 707 | mutex_lock(&data->mutex); |
| 708 | |
| 709 | for (i = 0; i < SX9500_NUM_CHANNELS; i++) |
| 710 | if (test_bit(i, indio_dev->active_scan_mask)) { |
| 711 | ret = sx9500_dec_chan_users(data, i); |
| 712 | if (ret) |
| 713 | break; |
| 714 | } |
| 715 | |
| 716 | if (ret) |
| 717 | for (i = i - 1; i >= 0; i--) |
| 718 | if (test_bit(i, indio_dev->active_scan_mask)) |
| 719 | sx9500_inc_chan_users(data, i); |
| 720 | |
| 721 | mutex_unlock(&data->mutex); |
| 722 | |
| 723 | return ret; |
| 724 | } |
| 725 | |
| 726 | static const struct iio_buffer_setup_ops sx9500_buffer_setup_ops = { |
Alexandru Ardelean | 3cfd646 | 2019-09-20 11:35:13 +0300 | [diff] [blame] | 727 | .postenable = sx9500_buffer_postenable, |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 728 | .predisable = sx9500_buffer_predisable, |
| 729 | }; |
| 730 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 731 | struct sx9500_reg_default { |
| 732 | u8 reg; |
| 733 | u8 def; |
| 734 | }; |
| 735 | |
| 736 | static const struct sx9500_reg_default sx9500_default_regs[] = { |
| 737 | { |
| 738 | .reg = SX9500_REG_PROX_CTRL1, |
| 739 | /* Shield enabled, small range. */ |
| 740 | .def = 0x43, |
| 741 | }, |
| 742 | { |
| 743 | .reg = SX9500_REG_PROX_CTRL2, |
| 744 | /* x8 gain, 167kHz frequency, finest resolution. */ |
| 745 | .def = 0x77, |
| 746 | }, |
| 747 | { |
| 748 | .reg = SX9500_REG_PROX_CTRL3, |
| 749 | /* Doze enabled, 2x scan period doze, no raw filter. */ |
| 750 | .def = 0x40, |
| 751 | }, |
| 752 | { |
| 753 | .reg = SX9500_REG_PROX_CTRL4, |
| 754 | /* Average threshold. */ |
| 755 | .def = 0x30, |
| 756 | }, |
| 757 | { |
| 758 | .reg = SX9500_REG_PROX_CTRL5, |
| 759 | /* |
| 760 | * Debouncer off, lowest average negative filter, |
Bhaskar Chowdhury | a04e3db | 2021-02-10 14:27:04 +0530 | [diff] [blame] | 761 | * highest average positive filter. |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 762 | */ |
| 763 | .def = 0x0f, |
| 764 | }, |
| 765 | { |
| 766 | .reg = SX9500_REG_PROX_CTRL6, |
| 767 | /* Proximity detection threshold: 280 */ |
| 768 | .def = 0x0e, |
| 769 | }, |
| 770 | { |
| 771 | .reg = SX9500_REG_PROX_CTRL7, |
| 772 | /* |
| 773 | * No automatic compensation, compensate each pin |
| 774 | * independently, proximity hysteresis: 32, close |
| 775 | * debouncer off, far debouncer off. |
| 776 | */ |
| 777 | .def = 0x00, |
| 778 | }, |
| 779 | { |
| 780 | .reg = SX9500_REG_PROX_CTRL8, |
| 781 | /* No stuck timeout, no periodic compensation. */ |
| 782 | .def = 0x00, |
| 783 | }, |
| 784 | { |
| 785 | .reg = SX9500_REG_PROX_CTRL0, |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 786 | /* Scan period: 30ms, all sensors disabled. */ |
| 787 | .def = 0x00, |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 788 | }, |
| 789 | }; |
| 790 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 791 | /* Activate all channels and perform an initial compensation. */ |
| 792 | static int sx9500_init_compensation(struct iio_dev *indio_dev) |
| 793 | { |
| 794 | struct sx9500_data *data = iio_priv(indio_dev); |
| 795 | int i, ret; |
| 796 | unsigned int val; |
| 797 | |
| 798 | ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0, |
Vlad Dogaru | 68958bd | 2015-06-30 14:20:59 +0300 | [diff] [blame] | 799 | SX9500_CHAN_MASK, SX9500_CHAN_MASK); |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 800 | if (ret < 0) |
| 801 | return ret; |
| 802 | |
| 803 | for (i = 10; i >= 0; i--) { |
| 804 | usleep_range(10000, 20000); |
| 805 | ret = regmap_read(data->regmap, SX9500_REG_STAT, &val); |
| 806 | if (ret < 0) |
| 807 | goto out; |
| 808 | if (!(val & SX9500_COMPSTAT_MASK)) |
| 809 | break; |
| 810 | } |
| 811 | |
| 812 | if (i < 0) { |
| 813 | dev_err(&data->client->dev, "initial compensation timed out"); |
| 814 | ret = -ETIMEDOUT; |
| 815 | } |
| 816 | |
| 817 | out: |
| 818 | regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0, |
Vlad Dogaru | 68958bd | 2015-06-30 14:20:59 +0300 | [diff] [blame] | 819 | SX9500_CHAN_MASK, 0); |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 820 | return ret; |
| 821 | } |
| 822 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 823 | static int sx9500_init_device(struct iio_dev *indio_dev) |
| 824 | { |
| 825 | struct sx9500_data *data = iio_priv(indio_dev); |
| 826 | int ret, i; |
| 827 | unsigned int val; |
| 828 | |
Vlad Dogaru | 45fd5f8 | 2015-04-12 20:09:21 +0300 | [diff] [blame] | 829 | if (data->gpiod_rst) { |
| 830 | gpiod_set_value_cansleep(data->gpiod_rst, 0); |
| 831 | usleep_range(1000, 2000); |
| 832 | gpiod_set_value_cansleep(data->gpiod_rst, 1); |
| 833 | usleep_range(1000, 2000); |
| 834 | } |
| 835 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 836 | ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0); |
| 837 | if (ret < 0) |
| 838 | return ret; |
| 839 | |
| 840 | ret = regmap_write(data->regmap, SX9500_REG_RESET, |
| 841 | SX9500_SOFT_RESET); |
| 842 | if (ret < 0) |
| 843 | return ret; |
| 844 | |
| 845 | ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val); |
| 846 | if (ret < 0) |
| 847 | return ret; |
| 848 | |
| 849 | for (i = 0; i < ARRAY_SIZE(sx9500_default_regs); i++) { |
| 850 | ret = regmap_write(data->regmap, |
| 851 | sx9500_default_regs[i].reg, |
| 852 | sx9500_default_regs[i].def); |
| 853 | if (ret < 0) |
| 854 | return ret; |
| 855 | } |
| 856 | |
Jonathan Cameron | 1a30295 | 2015-05-02 11:29:42 +0100 | [diff] [blame] | 857 | return sx9500_init_compensation(indio_dev); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 858 | } |
| 859 | |
Andy Shevchenko | b61d8e6 | 2018-02-26 21:37:35 +0200 | [diff] [blame] | 860 | static const struct acpi_gpio_params reset_gpios = { 0, 0, false }; |
| 861 | static const struct acpi_gpio_params interrupt_gpios = { 2, 0, false }; |
| 862 | |
| 863 | static const struct acpi_gpio_mapping acpi_sx9500_gpios[] = { |
| 864 | { "reset-gpios", &reset_gpios, 1 }, |
| 865 | /* |
| 866 | * Some platforms have a bug in ACPI GPIO description making IRQ |
| 867 | * GPIO to be output only. Ask the GPIO core to ignore this limit. |
| 868 | */ |
| 869 | { "interrupt-gpios", &interrupt_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION }, |
| 870 | { }, |
| 871 | }; |
| 872 | |
Vlad Dogaru | 821ace2 | 2015-04-12 20:09:20 +0300 | [diff] [blame] | 873 | static void sx9500_gpio_probe(struct i2c_client *client, |
| 874 | struct sx9500_data *data) |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 875 | { |
Andy Shevchenko | e53111a | 2017-11-03 15:03:36 +0200 | [diff] [blame] | 876 | struct gpio_desc *gpiod_int; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 877 | struct device *dev; |
Andy Shevchenko | b61d8e6 | 2018-02-26 21:37:35 +0200 | [diff] [blame] | 878 | int ret; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 879 | |
| 880 | if (!client) |
Vlad Dogaru | 821ace2 | 2015-04-12 20:09:20 +0300 | [diff] [blame] | 881 | return; |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 882 | |
| 883 | dev = &client->dev; |
| 884 | |
Andy Shevchenko | b61d8e6 | 2018-02-26 21:37:35 +0200 | [diff] [blame] | 885 | ret = devm_acpi_dev_add_driver_gpios(dev, acpi_sx9500_gpios); |
| 886 | if (ret) |
| 887 | dev_dbg(dev, "Unable to add GPIO mapping table\n"); |
| 888 | |
Andy Shevchenko | e53111a | 2017-11-03 15:03:36 +0200 | [diff] [blame] | 889 | if (client->irq <= 0) { |
Andy Shevchenko | b61d8e6 | 2018-02-26 21:37:35 +0200 | [diff] [blame] | 890 | gpiod_int = devm_gpiod_get(dev, "interrupt", GPIOD_IN); |
Andy Shevchenko | e53111a | 2017-11-03 15:03:36 +0200 | [diff] [blame] | 891 | if (IS_ERR(gpiod_int)) |
| 892 | dev_err(dev, "gpio get irq failed\n"); |
| 893 | else |
| 894 | client->irq = gpiod_to_irq(gpiod_int); |
| 895 | } |
| 896 | |
Andy Shevchenko | b61d8e6 | 2018-02-26 21:37:35 +0200 | [diff] [blame] | 897 | data->gpiod_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); |
Vlad Dogaru | 45fd5f8 | 2015-04-12 20:09:21 +0300 | [diff] [blame] | 898 | if (IS_ERR(data->gpiod_rst)) { |
| 899 | dev_warn(dev, "gpio get reset pin failed\n"); |
| 900 | data->gpiod_rst = NULL; |
| 901 | } |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 902 | } |
| 903 | |
| 904 | static int sx9500_probe(struct i2c_client *client, |
| 905 | const struct i2c_device_id *id) |
| 906 | { |
| 907 | int ret; |
| 908 | struct iio_dev *indio_dev; |
| 909 | struct sx9500_data *data; |
| 910 | |
| 911 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
| 912 | if (indio_dev == NULL) |
| 913 | return -ENOMEM; |
| 914 | |
| 915 | data = iio_priv(indio_dev); |
| 916 | data->client = client; |
| 917 | mutex_init(&data->mutex); |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 918 | init_completion(&data->completion); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 919 | data->trigger_enabled = false; |
| 920 | |
| 921 | data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config); |
| 922 | if (IS_ERR(data->regmap)) |
| 923 | return PTR_ERR(data->regmap); |
| 924 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 925 | indio_dev->name = SX9500_DRIVER_NAME; |
| 926 | indio_dev->channels = sx9500_channels; |
| 927 | indio_dev->num_channels = ARRAY_SIZE(sx9500_channels); |
| 928 | indio_dev->info = &sx9500_info; |
| 929 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 930 | i2c_set_clientdata(client, indio_dev); |
| 931 | |
Vlad Dogaru | 821ace2 | 2015-04-12 20:09:20 +0300 | [diff] [blame] | 932 | sx9500_gpio_probe(client, data); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 933 | |
Vlad Dogaru | 45fd5f8 | 2015-04-12 20:09:21 +0300 | [diff] [blame] | 934 | ret = sx9500_init_device(indio_dev); |
| 935 | if (ret < 0) |
| 936 | return ret; |
| 937 | |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 938 | if (client->irq <= 0) |
| 939 | dev_warn(&client->dev, "no valid irq found\n"); |
| 940 | else { |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 941 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
| 942 | sx9500_irq_handler, sx9500_irq_thread_handler, |
| 943 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| 944 | SX9500_IRQ_NAME, indio_dev); |
| 945 | if (ret < 0) |
| 946 | return ret; |
| 947 | |
| 948 | data->trig = devm_iio_trigger_alloc(&client->dev, |
Jonathan Cameron | 15ea2878 | 2021-04-26 18:49:03 +0100 | [diff] [blame] | 949 | "%s-dev%d", indio_dev->name, iio_device_id(indio_dev)); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 950 | if (!data->trig) |
| 951 | return -ENOMEM; |
| 952 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 953 | data->trig->ops = &sx9500_trigger_ops; |
| 954 | iio_trigger_set_drvdata(data->trig, indio_dev); |
| 955 | |
| 956 | ret = iio_trigger_register(data->trig); |
| 957 | if (ret) |
| 958 | return ret; |
| 959 | } |
| 960 | |
| 961 | ret = iio_triggered_buffer_setup(indio_dev, NULL, |
Vlad Dogaru | 59bd042 | 2015-04-12 20:09:19 +0300 | [diff] [blame] | 962 | sx9500_trigger_handler, |
| 963 | &sx9500_buffer_setup_ops); |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 964 | if (ret < 0) |
| 965 | goto out_trigger_unregister; |
| 966 | |
| 967 | ret = iio_device_register(indio_dev); |
| 968 | if (ret < 0) |
| 969 | goto out_buffer_cleanup; |
| 970 | |
| 971 | return 0; |
| 972 | |
| 973 | out_buffer_cleanup: |
| 974 | iio_triggered_buffer_cleanup(indio_dev); |
| 975 | out_trigger_unregister: |
| 976 | if (client->irq > 0) |
| 977 | iio_trigger_unregister(data->trig); |
| 978 | |
| 979 | return ret; |
| 980 | } |
| 981 | |
| 982 | static int sx9500_remove(struct i2c_client *client) |
| 983 | { |
| 984 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 985 | struct sx9500_data *data = iio_priv(indio_dev); |
| 986 | |
| 987 | iio_device_unregister(indio_dev); |
| 988 | iio_triggered_buffer_cleanup(indio_dev); |
| 989 | if (client->irq > 0) |
| 990 | iio_trigger_unregister(data->trig); |
| 991 | kfree(data->buffer); |
| 992 | |
| 993 | return 0; |
| 994 | } |
| 995 | |
Vlad Dogaru | 7840ffe | 2015-04-03 15:47:29 +0300 | [diff] [blame] | 996 | #ifdef CONFIG_PM_SLEEP |
| 997 | static int sx9500_suspend(struct device *dev) |
| 998 | { |
| 999 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| 1000 | struct sx9500_data *data = iio_priv(indio_dev); |
| 1001 | int ret; |
| 1002 | |
| 1003 | mutex_lock(&data->mutex); |
| 1004 | ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, |
| 1005 | &data->suspend_ctrl0); |
| 1006 | if (ret < 0) |
| 1007 | goto out; |
| 1008 | |
| 1009 | /* |
| 1010 | * Scan period doesn't matter because when all the sensors are |
| 1011 | * deactivated the device is in sleep mode. |
| 1012 | */ |
| 1013 | ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 0); |
| 1014 | |
| 1015 | out: |
| 1016 | mutex_unlock(&data->mutex); |
| 1017 | return ret; |
| 1018 | } |
| 1019 | |
| 1020 | static int sx9500_resume(struct device *dev) |
| 1021 | { |
| 1022 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| 1023 | struct sx9500_data *data = iio_priv(indio_dev); |
| 1024 | int ret; |
| 1025 | |
| 1026 | mutex_lock(&data->mutex); |
| 1027 | ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, |
| 1028 | data->suspend_ctrl0); |
| 1029 | mutex_unlock(&data->mutex); |
| 1030 | |
| 1031 | return ret; |
| 1032 | } |
| 1033 | #endif /* CONFIG_PM_SLEEP */ |
| 1034 | |
| 1035 | static const struct dev_pm_ops sx9500_pm_ops = { |
| 1036 | SET_SYSTEM_SLEEP_PM_OPS(sx9500_suspend, sx9500_resume) |
| 1037 | }; |
| 1038 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 1039 | static const struct acpi_device_id sx9500_acpi_match[] = { |
| 1040 | {"SSX9500", 0}, |
Andy Shevchenko | b879355 | 2017-11-03 15:03:39 +0200 | [diff] [blame] | 1041 | {"SASX9500", 0}, |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 1042 | { }, |
| 1043 | }; |
| 1044 | MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match); |
| 1045 | |
Christoph Fritz | a5c8b11 | 2016-09-03 12:30:00 +0200 | [diff] [blame] | 1046 | static const struct of_device_id sx9500_of_match[] = { |
| 1047 | { .compatible = "semtech,sx9500", }, |
| 1048 | { } |
| 1049 | }; |
| 1050 | MODULE_DEVICE_TABLE(of, sx9500_of_match); |
| 1051 | |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 1052 | static const struct i2c_device_id sx9500_id[] = { |
| 1053 | {"sx9500", 0}, |
Vlad Dogaru | a40c0ac | 2015-04-03 15:47:34 +0300 | [diff] [blame] | 1054 | { }, |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 1055 | }; |
| 1056 | MODULE_DEVICE_TABLE(i2c, sx9500_id); |
| 1057 | |
| 1058 | static struct i2c_driver sx9500_driver = { |
| 1059 | .driver = { |
| 1060 | .name = SX9500_DRIVER_NAME, |
| 1061 | .acpi_match_table = ACPI_PTR(sx9500_acpi_match), |
Christoph Fritz | a5c8b11 | 2016-09-03 12:30:00 +0200 | [diff] [blame] | 1062 | .of_match_table = of_match_ptr(sx9500_of_match), |
Vlad Dogaru | 7840ffe | 2015-04-03 15:47:29 +0300 | [diff] [blame] | 1063 | .pm = &sx9500_pm_ops, |
Vlad Dogaru | 4193c0f | 2014-12-29 14:41:14 +0200 | [diff] [blame] | 1064 | }, |
| 1065 | .probe = sx9500_probe, |
| 1066 | .remove = sx9500_remove, |
| 1067 | .id_table = sx9500_id, |
| 1068 | }; |
| 1069 | module_i2c_driver(sx9500_driver); |
| 1070 | |
| 1071 | MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>"); |
| 1072 | MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor"); |
| 1073 | MODULE_LICENSE("GPL v2"); |