blob: c6d4567f395205da803451431ca380bce5240c80 [file] [log] [blame]
Tim Harvey3bce5372020-05-15 10:57:08 -07001// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for Gateworks System Controller Hardware Monitor module
4 *
5 * Copyright (C) 2020 Gateworks Corporation
6 */
7#include <linux/hwmon.h>
8#include <linux/hwmon-sysfs.h>
9#include <linux/mfd/gsc.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <linux/slab.h>
15
16#include <linux/platform_data/gsc_hwmon.h>
17
18#define GSC_HWMON_MAX_TEMP_CH 16
19#define GSC_HWMON_MAX_IN_CH 16
20
21#define GSC_HWMON_RESOLUTION 12
22#define GSC_HWMON_VREF 2500
23
24struct gsc_hwmon_data {
25 struct gsc_dev *gsc;
26 struct gsc_hwmon_platform_data *pdata;
27 struct regmap *regmap;
28 const struct gsc_hwmon_channel *temp_ch[GSC_HWMON_MAX_TEMP_CH];
29 const struct gsc_hwmon_channel *in_ch[GSC_HWMON_MAX_IN_CH];
30 u32 temp_config[GSC_HWMON_MAX_TEMP_CH + 1];
31 u32 in_config[GSC_HWMON_MAX_IN_CH + 1];
32 struct hwmon_channel_info temp_info;
33 struct hwmon_channel_info in_info;
34 const struct hwmon_channel_info *info[3];
35 struct hwmon_chip_info chip;
36};
37
38static struct regmap_bus gsc_hwmon_regmap_bus = {
39 .reg_read = gsc_read,
40 .reg_write = gsc_write,
41};
42
43static const struct regmap_config gsc_hwmon_regmap_config = {
44 .reg_bits = 8,
45 .val_bits = 8,
46 .cache_type = REGCACHE_NONE,
47};
48
49static ssize_t pwm_auto_point_temp_show(struct device *dev,
50 struct device_attribute *devattr,
51 char *buf)
52{
53 struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
54 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
55 u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
56 u8 regs[2];
57 int ret;
58
59 ret = regmap_bulk_read(hwmon->regmap, reg, regs, 2);
60 if (ret)
61 return ret;
62
63 ret = regs[0] | regs[1] << 8;
64 return sprintf(buf, "%d\n", ret * 10);
65}
66
67static ssize_t pwm_auto_point_temp_store(struct device *dev,
68 struct device_attribute *devattr,
69 const char *buf, size_t count)
70{
71 struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
72 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
73 u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
74 u8 regs[2];
75 long temp;
76 int err;
77
78 if (kstrtol(buf, 10, &temp))
79 return -EINVAL;
80
81 temp = clamp_val(temp, 0, 10000);
82 temp = DIV_ROUND_CLOSEST(temp, 10);
83
84 regs[0] = temp & 0xff;
85 regs[1] = (temp >> 8) & 0xff;
86 err = regmap_bulk_write(hwmon->regmap, reg, regs, 2);
87 if (err)
88 return err;
89
90 return count;
91}
92
93static ssize_t pwm_auto_point_pwm_show(struct device *dev,
94 struct device_attribute *devattr,
95 char *buf)
96{
97 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
98
99 return sprintf(buf, "%d\n", 255 * (50 + (attr->index * 10)) / 100);
100}
101
102static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm_auto_point_pwm, 0);
103static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, pwm_auto_point_temp, 0);
104
105static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point2_pwm, pwm_auto_point_pwm, 1);
106static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_temp, pwm_auto_point_temp, 1);
107
108static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm_auto_point_pwm, 2);
109static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_temp, pwm_auto_point_temp, 2);
110
111static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point4_pwm, pwm_auto_point_pwm, 3);
112static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_temp, pwm_auto_point_temp, 3);
113
114static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm_auto_point_pwm, 4);
115static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point5_temp, pwm_auto_point_temp, 4);
116
117static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point6_pwm, pwm_auto_point_pwm, 5);
118static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point6_temp, pwm_auto_point_temp, 5);
119
120static struct attribute *gsc_hwmon_attributes[] = {
121 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
122 &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
123 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
124 &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
125 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
126 &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
127 &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
128 &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
129 &sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
130 &sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
131 &sensor_dev_attr_pwm1_auto_point6_pwm.dev_attr.attr,
132 &sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
133 NULL
134};
135
136static const struct attribute_group gsc_hwmon_group = {
137 .attrs = gsc_hwmon_attributes,
138};
139__ATTRIBUTE_GROUPS(gsc_hwmon);
140
141static int
142gsc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
143 int channel, long *val)
144{
145 struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
146 const struct gsc_hwmon_channel *ch;
147 int sz, ret;
148 long tmp;
149 u8 buf[3];
150
151 switch (type) {
152 case hwmon_in:
153 ch = hwmon->in_ch[channel];
154 break;
155 case hwmon_temp:
156 ch = hwmon->temp_ch[channel];
157 break;
158 default:
159 return -EOPNOTSUPP;
160 }
161
Tim Harveya4872f72020-06-09 07:57:20 -0700162 sz = (ch->mode == mode_voltage_24bit) ? 3 : 2;
Tim Harvey3bce5372020-05-15 10:57:08 -0700163 ret = regmap_bulk_read(hwmon->regmap, ch->reg, buf, sz);
164 if (ret)
165 return ret;
166
167 tmp = 0;
168 while (sz-- > 0)
169 tmp |= (buf[sz] << (8 * sz));
170
171 switch (ch->mode) {
172 case mode_temperature:
173 if (tmp > 0x8000)
174 tmp -= 0xffff;
Tim Harveyc1ae18d2020-08-27 10:20:24 -0700175 tmp *= 100; /* convert to millidegrees celsius */
Tim Harvey3bce5372020-05-15 10:57:08 -0700176 break;
177 case mode_voltage_raw:
178 tmp = clamp_val(tmp, 0, BIT(GSC_HWMON_RESOLUTION));
179 /* scale based on ref voltage and ADC resolution */
180 tmp *= GSC_HWMON_VREF;
181 tmp >>= GSC_HWMON_RESOLUTION;
182 /* scale based on optional voltage divider */
183 if (ch->vdiv[0] && ch->vdiv[1]) {
184 tmp *= (ch->vdiv[0] + ch->vdiv[1]);
185 tmp /= ch->vdiv[1];
186 }
187 /* adjust by uV offset */
188 tmp += ch->mvoffset;
189 break;
Tim Harveya4872f72020-06-09 07:57:20 -0700190 case mode_voltage_24bit:
191 case mode_voltage_16bit:
Tim Harvey3bce5372020-05-15 10:57:08 -0700192 /* no adjustment needed */
193 break;
194 }
195
196 *val = tmp;
197
198 return 0;
199}
200
201static int
202gsc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
203 u32 attr, int channel, const char **buf)
204{
205 struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
206
207 switch (type) {
208 case hwmon_in:
209 *buf = hwmon->in_ch[channel]->name;
210 break;
211 case hwmon_temp:
212 *buf = hwmon->temp_ch[channel]->name;
213 break;
214 default:
215 return -ENOTSUPP;
216 }
217
218 return 0;
219}
220
221static umode_t
222gsc_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
223 int ch)
224{
225 return 0444;
226}
227
228static const struct hwmon_ops gsc_hwmon_ops = {
229 .is_visible = gsc_hwmon_is_visible,
230 .read = gsc_hwmon_read,
231 .read_string = gsc_hwmon_read_string,
232};
233
234static struct gsc_hwmon_platform_data *
235gsc_hwmon_get_devtree_pdata(struct device *dev)
236{
237 struct gsc_hwmon_platform_data *pdata;
238 struct gsc_hwmon_channel *ch;
239 struct fwnode_handle *child;
240 struct device_node *fan;
241 int nchannels;
242
243 nchannels = device_get_child_node_count(dev);
244 if (nchannels == 0)
245 return ERR_PTR(-ENODEV);
246
247 pdata = devm_kzalloc(dev,
248 sizeof(*pdata) + nchannels * sizeof(*ch),
249 GFP_KERNEL);
250 if (!pdata)
251 return ERR_PTR(-ENOMEM);
252 ch = (struct gsc_hwmon_channel *)(pdata + 1);
253 pdata->channels = ch;
254 pdata->nchannels = nchannels;
255
256 /* fan controller base address */
257 fan = of_find_compatible_node(dev->parent->of_node, NULL, "gw,gsc-fan");
258 if (fan && of_property_read_u32(fan, "reg", &pdata->fan_base)) {
259 dev_err(dev, "fan node without base\n");
260 return ERR_PTR(-EINVAL);
261 }
262
263 /* allocate structures for channels and count instances of each type */
264 device_for_each_child_node(dev, child) {
265 if (fwnode_property_read_string(child, "label", &ch->name)) {
266 dev_err(dev, "channel without label\n");
267 fwnode_handle_put(child);
268 return ERR_PTR(-EINVAL);
269 }
270 if (fwnode_property_read_u32(child, "reg", &ch->reg)) {
271 dev_err(dev, "channel without reg\n");
272 fwnode_handle_put(child);
273 return ERR_PTR(-EINVAL);
274 }
275 if (fwnode_property_read_u32(child, "gw,mode", &ch->mode)) {
276 dev_err(dev, "channel without mode\n");
277 fwnode_handle_put(child);
278 return ERR_PTR(-EINVAL);
279 }
280 if (ch->mode > mode_max) {
281 dev_err(dev, "invalid channel mode\n");
282 fwnode_handle_put(child);
283 return ERR_PTR(-EINVAL);
284 }
285
286 if (!fwnode_property_read_u32(child,
287 "gw,voltage-offset-microvolt",
288 &ch->mvoffset))
289 ch->mvoffset /= 1000;
290 fwnode_property_read_u32_array(child,
291 "gw,voltage-divider-ohms",
292 ch->vdiv, ARRAY_SIZE(ch->vdiv));
293 ch++;
294 }
295
296 return pdata;
297}
298
299static int gsc_hwmon_probe(struct platform_device *pdev)
300{
301 struct gsc_dev *gsc = dev_get_drvdata(pdev->dev.parent);
302 struct device *dev = &pdev->dev;
303 struct device *hwmon_dev;
304 struct gsc_hwmon_platform_data *pdata = dev_get_platdata(dev);
305 struct gsc_hwmon_data *hwmon;
306 const struct attribute_group **groups;
307 int i, i_in, i_temp;
308
309 if (!pdata) {
310 pdata = gsc_hwmon_get_devtree_pdata(dev);
311 if (IS_ERR(pdata))
312 return PTR_ERR(pdata);
313 }
314
315 hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
316 if (!hwmon)
317 return -ENOMEM;
318 hwmon->gsc = gsc;
319 hwmon->pdata = pdata;
320
321 hwmon->regmap = devm_regmap_init(dev, &gsc_hwmon_regmap_bus,
322 gsc->i2c_hwmon,
323 &gsc_hwmon_regmap_config);
324 if (IS_ERR(hwmon->regmap))
325 return PTR_ERR(hwmon->regmap);
326
327 for (i = 0, i_in = 0, i_temp = 0; i < hwmon->pdata->nchannels; i++) {
328 const struct gsc_hwmon_channel *ch = &pdata->channels[i];
329
330 switch (ch->mode) {
331 case mode_temperature:
332 if (i_temp == GSC_HWMON_MAX_TEMP_CH) {
333 dev_err(gsc->dev, "too many temp channels\n");
334 return -EINVAL;
335 }
336 hwmon->temp_ch[i_temp] = ch;
337 hwmon->temp_config[i_temp] = HWMON_T_INPUT |
338 HWMON_T_LABEL;
339 i_temp++;
340 break;
Tim Harveya4872f72020-06-09 07:57:20 -0700341 case mode_voltage_24bit:
342 case mode_voltage_16bit:
Tim Harvey3bce5372020-05-15 10:57:08 -0700343 case mode_voltage_raw:
344 if (i_in == GSC_HWMON_MAX_IN_CH) {
345 dev_err(gsc->dev, "too many input channels\n");
346 return -EINVAL;
347 }
348 hwmon->in_ch[i_in] = ch;
349 hwmon->in_config[i_in] =
350 HWMON_I_INPUT | HWMON_I_LABEL;
351 i_in++;
352 break;
353 default:
354 dev_err(gsc->dev, "invalid mode: %d\n", ch->mode);
355 return -EINVAL;
356 }
357 }
358
359 /* setup config structures */
360 hwmon->chip.ops = &gsc_hwmon_ops;
361 hwmon->chip.info = hwmon->info;
362 hwmon->info[0] = &hwmon->temp_info;
363 hwmon->info[1] = &hwmon->in_info;
364 hwmon->temp_info.type = hwmon_temp;
365 hwmon->temp_info.config = hwmon->temp_config;
366 hwmon->in_info.type = hwmon_in;
367 hwmon->in_info.config = hwmon->in_config;
368
369 groups = pdata->fan_base ? gsc_hwmon_groups : NULL;
370 hwmon_dev = devm_hwmon_device_register_with_info(dev,
371 KBUILD_MODNAME, hwmon,
372 &hwmon->chip, groups);
373 return PTR_ERR_OR_ZERO(hwmon_dev);
374}
375
376static const struct of_device_id gsc_hwmon_of_match[] = {
377 { .compatible = "gw,gsc-adc", },
378 {}
379};
380
381static struct platform_driver gsc_hwmon_driver = {
382 .driver = {
383 .name = "gsc-hwmon",
384 .of_match_table = gsc_hwmon_of_match,
385 },
386 .probe = gsc_hwmon_probe,
387};
388
389module_platform_driver(gsc_hwmon_driver);
390
391MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
392MODULE_DESCRIPTION("GSC hardware monitor driver");
393MODULE_LICENSE("GPL v2");