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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Texas Instruments TMP108 SMBus temperature sensor driver
3 *
4 * Copyright (C) 2016 John Muir <john@jmuir.com>
5 */
6
7#include <linux/delay.h>
8#include <linux/device.h>
9#include <linux/err.h>
10#include <linux/hwmon.h>
11#include <linux/hwmon-sysfs.h>
12#include <linux/module.h>
13#include <linux/mutex.h>
14#include <linux/of.h>
15#include <linux/i2c.h>
16#include <linux/init.h>
17#include <linux/jiffies.h>
18#include <linux/regmap.h>
19#include <linux/slab.h>
20
21#define DRIVER_NAME "tmp108"
22
23#define TMP108_REG_TEMP 0x00
24#define TMP108_REG_CONF 0x01
25#define TMP108_REG_TLOW 0x02
26#define TMP108_REG_THIGH 0x03
27
28#define TMP108_TEMP_MIN_MC -50000 /* Minimum millicelcius. */
29#define TMP108_TEMP_MAX_MC 127937 /* Maximum millicelcius. */
30
31/* Configuration register bits.
32 * Note: these bit definitions are byte swapped.
33 */
34#define TMP108_CONF_M0 0x0100 /* Sensor mode. */
35#define TMP108_CONF_M1 0x0200
36#define TMP108_CONF_TM 0x0400 /* Thermostat mode. */
37#define TMP108_CONF_FL 0x0800 /* Watchdog flag - TLOW */
38#define TMP108_CONF_FH 0x1000 /* Watchdog flag - THIGH */
39#define TMP108_CONF_CR0 0x2000 /* Conversion rate. */
40#define TMP108_CONF_CR1 0x4000
41#define TMP108_CONF_ID 0x8000
42#define TMP108_CONF_HYS0 0x0010 /* Hysteresis. */
43#define TMP108_CONF_HYS1 0x0020
44#define TMP108_CONF_POL 0x0080 /* Polarity of alert. */
45
46/* Defaults set by the hardware upon reset. */
47#define TMP108_CONF_DEFAULTS (TMP108_CONF_CR0 | TMP108_CONF_TM |\
48 TMP108_CONF_HYS0 | TMP108_CONF_M1)
49/* These bits are read-only. */
50#define TMP108_CONF_READ_ONLY (TMP108_CONF_FL | TMP108_CONF_FH |\
51 TMP108_CONF_ID)
52
53#define TMP108_CONF_MODE_MASK (TMP108_CONF_M0|TMP108_CONF_M1)
54#define TMP108_MODE_SHUTDOWN 0x0000
55#define TMP108_MODE_ONE_SHOT TMP108_CONF_M0
56#define TMP108_MODE_CONTINUOUS TMP108_CONF_M1 /* Default */
57 /* When M1 is set, M0 is ignored. */
58
59#define TMP108_CONF_CONVRATE_MASK (TMP108_CONF_CR0|TMP108_CONF_CR1)
60#define TMP108_CONVRATE_0P25HZ 0x0000
61#define TMP108_CONVRATE_1HZ TMP108_CONF_CR0 /* Default */
62#define TMP108_CONVRATE_4HZ TMP108_CONF_CR1
63#define TMP108_CONVRATE_16HZ (TMP108_CONF_CR0|TMP108_CONF_CR1)
64
65#define TMP108_CONF_HYSTERESIS_MASK (TMP108_CONF_HYS0|TMP108_CONF_HYS1)
66#define TMP108_HYSTERESIS_0C 0x0000
67#define TMP108_HYSTERESIS_1C TMP108_CONF_HYS0 /* Default */
68#define TMP108_HYSTERESIS_2C TMP108_CONF_HYS1
69#define TMP108_HYSTERESIS_4C (TMP108_CONF_HYS0|TMP108_CONF_HYS1)
70
71#define TMP108_CONVERSION_TIME_MS 30 /* in milli-seconds */
72
73struct tmp108 {
74 struct regmap *regmap;
75 u16 orig_config;
76 unsigned long ready_time;
77};
78
79/* convert 12-bit TMP108 register value to milliCelsius */
80static inline int tmp108_temp_reg_to_mC(s16 val)
81{
82 return (val & ~0x0f) * 1000 / 256;
83}
84
85/* convert milliCelsius to left adjusted 12-bit TMP108 register value */
86static inline u16 tmp108_mC_to_temp_reg(int val)
87{
88 return (val * 256) / 1000;
89}
90
91static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
92 u32 attr, int channel, long *temp)
93{
94 struct tmp108 *tmp108 = dev_get_drvdata(dev);
95 unsigned int regval;
96 int err, hyst;
97
98 if (type == hwmon_chip) {
99 if (attr == hwmon_chip_update_interval) {
100 err = regmap_read(tmp108->regmap, TMP108_REG_CONF,
101 ®val);
102 if (err < 0)
103 return err;
104 switch (regval & TMP108_CONF_CONVRATE_MASK) {
105 case TMP108_CONVRATE_0P25HZ:
106 default:
107 *temp = 4000;
108 break;
109 case TMP108_CONVRATE_1HZ:
110 *temp = 1000;
111 break;
112 case TMP108_CONVRATE_4HZ:
113 *temp = 250;
114 break;
115 case TMP108_CONVRATE_16HZ:
116 *temp = 63;
117 break;
118 }
119 return 0;
120 }
121 return -EOPNOTSUPP;
122 }
123
124 switch (attr) {
125 case hwmon_temp_input:
126 /* Is it too early to return a conversion ? */
127 if (time_before(jiffies, tmp108->ready_time)) {
128 dev_dbg(dev, "%s: Conversion not ready yet..\n",
129 __func__);
130 return -EAGAIN;
131 }
132 err = regmap_read(tmp108->regmap, TMP108_REG_TEMP, ®val);
133 if (err < 0)
134 return err;
135 *temp = tmp108_temp_reg_to_mC(regval);
136 break;
137 case hwmon_temp_min:
138 case hwmon_temp_max:
139 err = regmap_read(tmp108->regmap, attr == hwmon_temp_min ?
140 TMP108_REG_TLOW : TMP108_REG_THIGH, ®val);
141 if (err < 0)
142 return err;
143 *temp = tmp108_temp_reg_to_mC(regval);
144 break;
145 case hwmon_temp_min_alarm:
146 case hwmon_temp_max_alarm:
147 err = regmap_read(tmp108->regmap, TMP108_REG_CONF, ®val);
148 if (err < 0)
149 return err;
150 *temp = !!(regval & (attr == hwmon_temp_min_alarm ?
151 TMP108_CONF_FL : TMP108_CONF_FH));
152 break;
153 case hwmon_temp_min_hyst:
154 case hwmon_temp_max_hyst:
155 err = regmap_read(tmp108->regmap, TMP108_REG_CONF, ®val);
156 if (err < 0)
157 return err;
158 switch (regval & TMP108_CONF_HYSTERESIS_MASK) {
159 case TMP108_HYSTERESIS_0C:
160 default:
161 hyst = 0;
162 break;
163 case TMP108_HYSTERESIS_1C:
164 hyst = 1000;
165 break;
166 case TMP108_HYSTERESIS_2C:
167 hyst = 2000;
168 break;
169 case TMP108_HYSTERESIS_4C:
170 hyst = 4000;
171 break;
172 }
173 err = regmap_read(tmp108->regmap, attr == hwmon_temp_min_hyst ?
174 TMP108_REG_TLOW : TMP108_REG_THIGH, ®val);
175 if (err < 0)
176 return err;
177 *temp = tmp108_temp_reg_to_mC(regval);
178 if (attr == hwmon_temp_min_hyst)
179 *temp += hyst;
180 else
181 *temp -= hyst;
182 break;
183 default:
184 return -EOPNOTSUPP;
185 }
186
187 return 0;
188}
189
190static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
191 u32 attr, int channel, long temp)
192{
193 struct tmp108 *tmp108 = dev_get_drvdata(dev);
194 u32 regval, mask;
195 int err;
196
197 if (type == hwmon_chip) {
198 if (attr == hwmon_chip_update_interval) {
199 if (temp < 156)
200 mask = TMP108_CONVRATE_16HZ;
201 else if (temp < 625)
202 mask = TMP108_CONVRATE_4HZ;
203 else if (temp < 2500)
204 mask = TMP108_CONVRATE_1HZ;
205 else
206 mask = TMP108_CONVRATE_0P25HZ;
207 return regmap_update_bits(tmp108->regmap,
208 TMP108_REG_CONF,
209 TMP108_CONF_CONVRATE_MASK,
210 mask);
211 }
212 return -EOPNOTSUPP;
213 }
214
215 switch (attr) {
216 case hwmon_temp_min:
217 case hwmon_temp_max:
218 temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC);
219 return regmap_write(tmp108->regmap,
220 attr == hwmon_temp_min ?
221 TMP108_REG_TLOW : TMP108_REG_THIGH,
222 tmp108_mC_to_temp_reg(temp));
223 case hwmon_temp_min_hyst:
224 case hwmon_temp_max_hyst:
225 temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC);
226 err = regmap_read(tmp108->regmap,
227 attr == hwmon_temp_min_hyst ?
228 TMP108_REG_TLOW : TMP108_REG_THIGH,
229 ®val);
230 if (err < 0)
231 return err;
232 if (attr == hwmon_temp_min_hyst)
233 temp -= tmp108_temp_reg_to_mC(regval);
234 else
235 temp = tmp108_temp_reg_to_mC(regval) - temp;
236 if (temp < 500)
237 mask = TMP108_HYSTERESIS_0C;
238 else if (temp < 1500)
239 mask = TMP108_HYSTERESIS_1C;
240 else if (temp < 3000)
241 mask = TMP108_HYSTERESIS_2C;
242 else
243 mask = TMP108_HYSTERESIS_4C;
244 return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
245 TMP108_CONF_HYSTERESIS_MASK, mask);
246 default:
247 return -EOPNOTSUPP;
248 }
249}
250
251static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
252 u32 attr, int channel)
253{
254 if (type == hwmon_chip && attr == hwmon_chip_update_interval)
255 return 0644;
256
257 if (type != hwmon_temp)
258 return 0;
259
260 switch (attr) {
261 case hwmon_temp_input:
262 case hwmon_temp_min_alarm:
263 case hwmon_temp_max_alarm:
264 return 0444;
265 case hwmon_temp_min:
266 case hwmon_temp_max:
267 case hwmon_temp_min_hyst:
268 case hwmon_temp_max_hyst:
269 return 0644;
270 default:
271 return 0;
272 }
273}
274
275static const struct hwmon_channel_info * const tmp108_info[] = {
276 HWMON_CHANNEL_INFO(chip,
277 HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
278 HWMON_CHANNEL_INFO(temp,
279 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
280 HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
281 HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM),
282 NULL
283};
284
285static const struct hwmon_ops tmp108_hwmon_ops = {
286 .is_visible = tmp108_is_visible,
287 .read = tmp108_read,
288 .write = tmp108_write,
289};
290
291static const struct hwmon_chip_info tmp108_chip_info = {
292 .ops = &tmp108_hwmon_ops,
293 .info = tmp108_info,
294};
295
296static void tmp108_restore_config(void *data)
297{
298 struct tmp108 *tmp108 = data;
299
300 regmap_write(tmp108->regmap, TMP108_REG_CONF, tmp108->orig_config);
301}
302
303static bool tmp108_is_writeable_reg(struct device *dev, unsigned int reg)
304{
305 return reg != TMP108_REG_TEMP;
306}
307
308static bool tmp108_is_volatile_reg(struct device *dev, unsigned int reg)
309{
310 /* Configuration register must be volatile to enable FL and FH. */
311 return reg == TMP108_REG_TEMP || reg == TMP108_REG_CONF;
312}
313
314static const struct regmap_config tmp108_regmap_config = {
315 .reg_bits = 8,
316 .val_bits = 16,
317 .max_register = TMP108_REG_THIGH,
318 .writeable_reg = tmp108_is_writeable_reg,
319 .volatile_reg = tmp108_is_volatile_reg,
320 .val_format_endian = REGMAP_ENDIAN_BIG,
321 .cache_type = REGCACHE_MAPLE,
322 .use_single_read = true,
323 .use_single_write = true,
324};
325
326static int tmp108_probe(struct i2c_client *client)
327{
328 struct device *dev = &client->dev;
329 struct device *hwmon_dev;
330 struct tmp108 *tmp108;
331 int err;
332 u32 config;
333
334 if (!i2c_check_functionality(client->adapter,
335 I2C_FUNC_SMBUS_WORD_DATA)) {
336 dev_err(dev,
337 "adapter doesn't support SMBus word transactions\n");
338 return -ENODEV;
339 }
340
341 tmp108 = devm_kzalloc(dev, sizeof(*tmp108), GFP_KERNEL);
342 if (!tmp108)
343 return -ENOMEM;
344
345 dev_set_drvdata(dev, tmp108);
346
347 tmp108->regmap = devm_regmap_init_i2c(client, &tmp108_regmap_config);
348 if (IS_ERR(tmp108->regmap)) {
349 err = PTR_ERR(tmp108->regmap);
350 dev_err(dev, "regmap init failed: %d", err);
351 return err;
352 }
353
354 err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config);
355 if (err < 0) {
356 dev_err(dev, "error reading config register: %d", err);
357 return err;
358 }
359 tmp108->orig_config = config;
360
361 /* Only continuous mode is supported. */
362 config &= ~TMP108_CONF_MODE_MASK;
363 config |= TMP108_MODE_CONTINUOUS;
364
365 /* Only comparator mode is supported. */
366 config &= ~TMP108_CONF_TM;
367
368 err = regmap_write(tmp108->regmap, TMP108_REG_CONF, config);
369 if (err < 0) {
370 dev_err(dev, "error writing config register: %d", err);
371 return err;
372 }
373
374 tmp108->ready_time = jiffies;
375 if ((tmp108->orig_config & TMP108_CONF_MODE_MASK) ==
376 TMP108_MODE_SHUTDOWN)
377 tmp108->ready_time +=
378 msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
379
380 err = devm_add_action_or_reset(dev, tmp108_restore_config, tmp108);
381 if (err) {
382 dev_err(dev, "add action or reset failed: %d", err);
383 return err;
384 }
385
386 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
387 tmp108,
388 &tmp108_chip_info,
389 NULL);
390 return PTR_ERR_OR_ZERO(hwmon_dev);
391}
392
393static int tmp108_suspend(struct device *dev)
394{
395 struct tmp108 *tmp108 = dev_get_drvdata(dev);
396
397 return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
398 TMP108_CONF_MODE_MASK, TMP108_MODE_SHUTDOWN);
399}
400
401static int tmp108_resume(struct device *dev)
402{
403 struct tmp108 *tmp108 = dev_get_drvdata(dev);
404 int err;
405
406 err = regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
407 TMP108_CONF_MODE_MASK, TMP108_MODE_CONTINUOUS);
408 tmp108->ready_time = jiffies +
409 msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
410 return err;
411}
412
413static DEFINE_SIMPLE_DEV_PM_OPS(tmp108_dev_pm_ops, tmp108_suspend, tmp108_resume);
414
415static const struct i2c_device_id tmp108_i2c_ids[] = {
416 { "tmp108", 0 },
417 { }
418};
419MODULE_DEVICE_TABLE(i2c, tmp108_i2c_ids);
420
421#ifdef CONFIG_OF
422static const struct of_device_id tmp108_of_ids[] = {
423 { .compatible = "ti,tmp108", },
424 {}
425};
426MODULE_DEVICE_TABLE(of, tmp108_of_ids);
427#endif
428
429static struct i2c_driver tmp108_driver = {
430 .driver = {
431 .name = DRIVER_NAME,
432 .pm = pm_sleep_ptr(&tmp108_dev_pm_ops),
433 .of_match_table = of_match_ptr(tmp108_of_ids),
434 },
435 .probe = tmp108_probe,
436 .id_table = tmp108_i2c_ids,
437};
438
439module_i2c_driver(tmp108_driver);
440
441MODULE_AUTHOR("John Muir <john@jmuir.com>");
442MODULE_DESCRIPTION("Texas Instruments TMP108 temperature sensor driver");
443MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Texas Instruments TMP108 SMBus temperature sensor driver
3 *
4 * Copyright (C) 2016 John Muir <john@jmuir.com>
5 */
6
7#include <linux/delay.h>
8#include <linux/device.h>
9#include <linux/err.h>
10#include <linux/hwmon.h>
11#include <linux/hwmon-sysfs.h>
12#include <linux/module.h>
13#include <linux/mutex.h>
14#include <linux/of.h>
15#include <linux/i2c.h>
16#include <linux/i3c/device.h>
17#include <linux/init.h>
18#include <linux/jiffies.h>
19#include <linux/regmap.h>
20#include <linux/slab.h>
21
22#define DRIVER_NAME "tmp108"
23
24#define TMP108_REG_TEMP 0x00
25#define TMP108_REG_CONF 0x01
26#define TMP108_REG_TLOW 0x02
27#define TMP108_REG_THIGH 0x03
28
29#define TMP108_TEMP_MIN_MC -50000 /* Minimum millicelcius. */
30#define TMP108_TEMP_MAX_MC 127937 /* Maximum millicelcius. */
31
32/* Configuration register bits.
33 * Note: these bit definitions are byte swapped.
34 */
35#define TMP108_CONF_M0 0x0100 /* Sensor mode. */
36#define TMP108_CONF_M1 0x0200
37#define TMP108_CONF_TM 0x0400 /* Thermostat mode. */
38#define TMP108_CONF_FL 0x0800 /* Watchdog flag - TLOW */
39#define TMP108_CONF_FH 0x1000 /* Watchdog flag - THIGH */
40#define TMP108_CONF_CR0 0x2000 /* Conversion rate. */
41#define TMP108_CONF_CR1 0x4000
42#define TMP108_CONF_ID 0x8000
43#define TMP108_CONF_HYS0 0x0010 /* Hysteresis. */
44#define TMP108_CONF_HYS1 0x0020
45#define TMP108_CONF_POL 0x0080 /* Polarity of alert. */
46
47/* Defaults set by the hardware upon reset. */
48#define TMP108_CONF_DEFAULTS (TMP108_CONF_CR0 | TMP108_CONF_TM |\
49 TMP108_CONF_HYS0 | TMP108_CONF_M1)
50/* These bits are read-only. */
51#define TMP108_CONF_READ_ONLY (TMP108_CONF_FL | TMP108_CONF_FH |\
52 TMP108_CONF_ID)
53
54#define TMP108_CONF_MODE_MASK (TMP108_CONF_M0|TMP108_CONF_M1)
55#define TMP108_MODE_SHUTDOWN 0x0000
56#define TMP108_MODE_ONE_SHOT TMP108_CONF_M0
57#define TMP108_MODE_CONTINUOUS TMP108_CONF_M1 /* Default */
58 /* When M1 is set, M0 is ignored. */
59
60#define TMP108_CONF_CONVRATE_MASK (TMP108_CONF_CR0|TMP108_CONF_CR1)
61#define TMP108_CONVRATE_0P25HZ 0x0000
62#define TMP108_CONVRATE_1HZ TMP108_CONF_CR0 /* Default */
63#define TMP108_CONVRATE_4HZ TMP108_CONF_CR1
64#define TMP108_CONVRATE_16HZ (TMP108_CONF_CR0|TMP108_CONF_CR1)
65
66#define TMP108_CONF_HYSTERESIS_MASK (TMP108_CONF_HYS0|TMP108_CONF_HYS1)
67#define TMP108_HYSTERESIS_0C 0x0000
68#define TMP108_HYSTERESIS_1C TMP108_CONF_HYS0 /* Default */
69#define TMP108_HYSTERESIS_2C TMP108_CONF_HYS1
70#define TMP108_HYSTERESIS_4C (TMP108_CONF_HYS0|TMP108_CONF_HYS1)
71
72#define TMP108_CONVERSION_TIME_MS 30 /* in milli-seconds */
73
74struct tmp108 {
75 struct regmap *regmap;
76 u16 orig_config;
77 unsigned long ready_time;
78};
79
80/* convert 12-bit TMP108 register value to milliCelsius */
81static inline int tmp108_temp_reg_to_mC(s16 val)
82{
83 return (val & ~0x0f) * 1000 / 256;
84}
85
86/* convert milliCelsius to left adjusted 12-bit TMP108 register value */
87static inline u16 tmp108_mC_to_temp_reg(int val)
88{
89 return (val * 256) / 1000;
90}
91
92static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
93 u32 attr, int channel, long *temp)
94{
95 struct tmp108 *tmp108 = dev_get_drvdata(dev);
96 unsigned int regval;
97 int err, hyst;
98
99 if (type == hwmon_chip) {
100 if (attr == hwmon_chip_update_interval) {
101 err = regmap_read(tmp108->regmap, TMP108_REG_CONF,
102 ®val);
103 if (err < 0)
104 return err;
105 switch (regval & TMP108_CONF_CONVRATE_MASK) {
106 case TMP108_CONVRATE_0P25HZ:
107 default:
108 *temp = 4000;
109 break;
110 case TMP108_CONVRATE_1HZ:
111 *temp = 1000;
112 break;
113 case TMP108_CONVRATE_4HZ:
114 *temp = 250;
115 break;
116 case TMP108_CONVRATE_16HZ:
117 *temp = 63;
118 break;
119 }
120 return 0;
121 }
122 return -EOPNOTSUPP;
123 }
124
125 switch (attr) {
126 case hwmon_temp_input:
127 /* Is it too early to return a conversion ? */
128 if (time_before(jiffies, tmp108->ready_time)) {
129 dev_dbg(dev, "%s: Conversion not ready yet..\n",
130 __func__);
131 return -EAGAIN;
132 }
133 err = regmap_read(tmp108->regmap, TMP108_REG_TEMP, ®val);
134 if (err < 0)
135 return err;
136 *temp = tmp108_temp_reg_to_mC(regval);
137 break;
138 case hwmon_temp_min:
139 case hwmon_temp_max:
140 err = regmap_read(tmp108->regmap, attr == hwmon_temp_min ?
141 TMP108_REG_TLOW : TMP108_REG_THIGH, ®val);
142 if (err < 0)
143 return err;
144 *temp = tmp108_temp_reg_to_mC(regval);
145 break;
146 case hwmon_temp_min_alarm:
147 case hwmon_temp_max_alarm:
148 err = regmap_read(tmp108->regmap, TMP108_REG_CONF, ®val);
149 if (err < 0)
150 return err;
151 *temp = !!(regval & (attr == hwmon_temp_min_alarm ?
152 TMP108_CONF_FL : TMP108_CONF_FH));
153 break;
154 case hwmon_temp_min_hyst:
155 case hwmon_temp_max_hyst:
156 err = regmap_read(tmp108->regmap, TMP108_REG_CONF, ®val);
157 if (err < 0)
158 return err;
159 switch (regval & TMP108_CONF_HYSTERESIS_MASK) {
160 case TMP108_HYSTERESIS_0C:
161 default:
162 hyst = 0;
163 break;
164 case TMP108_HYSTERESIS_1C:
165 hyst = 1000;
166 break;
167 case TMP108_HYSTERESIS_2C:
168 hyst = 2000;
169 break;
170 case TMP108_HYSTERESIS_4C:
171 hyst = 4000;
172 break;
173 }
174 err = regmap_read(tmp108->regmap, attr == hwmon_temp_min_hyst ?
175 TMP108_REG_TLOW : TMP108_REG_THIGH, ®val);
176 if (err < 0)
177 return err;
178 *temp = tmp108_temp_reg_to_mC(regval);
179 if (attr == hwmon_temp_min_hyst)
180 *temp += hyst;
181 else
182 *temp -= hyst;
183 break;
184 default:
185 return -EOPNOTSUPP;
186 }
187
188 return 0;
189}
190
191static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
192 u32 attr, int channel, long temp)
193{
194 struct tmp108 *tmp108 = dev_get_drvdata(dev);
195 u32 regval, mask;
196 int err;
197
198 if (type == hwmon_chip) {
199 if (attr == hwmon_chip_update_interval) {
200 if (temp < 156)
201 mask = TMP108_CONVRATE_16HZ;
202 else if (temp < 625)
203 mask = TMP108_CONVRATE_4HZ;
204 else if (temp < 2500)
205 mask = TMP108_CONVRATE_1HZ;
206 else
207 mask = TMP108_CONVRATE_0P25HZ;
208 return regmap_update_bits(tmp108->regmap,
209 TMP108_REG_CONF,
210 TMP108_CONF_CONVRATE_MASK,
211 mask);
212 }
213 return -EOPNOTSUPP;
214 }
215
216 switch (attr) {
217 case hwmon_temp_min:
218 case hwmon_temp_max:
219 temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC);
220 return regmap_write(tmp108->regmap,
221 attr == hwmon_temp_min ?
222 TMP108_REG_TLOW : TMP108_REG_THIGH,
223 tmp108_mC_to_temp_reg(temp));
224 case hwmon_temp_min_hyst:
225 case hwmon_temp_max_hyst:
226 temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC);
227 err = regmap_read(tmp108->regmap,
228 attr == hwmon_temp_min_hyst ?
229 TMP108_REG_TLOW : TMP108_REG_THIGH,
230 ®val);
231 if (err < 0)
232 return err;
233 if (attr == hwmon_temp_min_hyst)
234 temp -= tmp108_temp_reg_to_mC(regval);
235 else
236 temp = tmp108_temp_reg_to_mC(regval) - temp;
237 if (temp < 500)
238 mask = TMP108_HYSTERESIS_0C;
239 else if (temp < 1500)
240 mask = TMP108_HYSTERESIS_1C;
241 else if (temp < 3000)
242 mask = TMP108_HYSTERESIS_2C;
243 else
244 mask = TMP108_HYSTERESIS_4C;
245 return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
246 TMP108_CONF_HYSTERESIS_MASK, mask);
247 default:
248 return -EOPNOTSUPP;
249 }
250}
251
252static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
253 u32 attr, int channel)
254{
255 if (type == hwmon_chip && attr == hwmon_chip_update_interval)
256 return 0644;
257
258 if (type != hwmon_temp)
259 return 0;
260
261 switch (attr) {
262 case hwmon_temp_input:
263 case hwmon_temp_min_alarm:
264 case hwmon_temp_max_alarm:
265 return 0444;
266 case hwmon_temp_min:
267 case hwmon_temp_max:
268 case hwmon_temp_min_hyst:
269 case hwmon_temp_max_hyst:
270 return 0644;
271 default:
272 return 0;
273 }
274}
275
276static const struct hwmon_channel_info * const tmp108_info[] = {
277 HWMON_CHANNEL_INFO(chip,
278 HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
279 HWMON_CHANNEL_INFO(temp,
280 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
281 HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
282 HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM),
283 NULL
284};
285
286static const struct hwmon_ops tmp108_hwmon_ops = {
287 .is_visible = tmp108_is_visible,
288 .read = tmp108_read,
289 .write = tmp108_write,
290};
291
292static const struct hwmon_chip_info tmp108_chip_info = {
293 .ops = &tmp108_hwmon_ops,
294 .info = tmp108_info,
295};
296
297static void tmp108_restore_config(void *data)
298{
299 struct tmp108 *tmp108 = data;
300
301 regmap_write(tmp108->regmap, TMP108_REG_CONF, tmp108->orig_config);
302}
303
304static bool tmp108_is_writeable_reg(struct device *dev, unsigned int reg)
305{
306 return reg != TMP108_REG_TEMP;
307}
308
309static bool tmp108_is_volatile_reg(struct device *dev, unsigned int reg)
310{
311 /* Configuration register must be volatile to enable FL and FH. */
312 return reg == TMP108_REG_TEMP || reg == TMP108_REG_CONF;
313}
314
315static const struct regmap_config tmp108_regmap_config = {
316 .reg_bits = 8,
317 .val_bits = 16,
318 .max_register = TMP108_REG_THIGH,
319 .writeable_reg = tmp108_is_writeable_reg,
320 .volatile_reg = tmp108_is_volatile_reg,
321 .val_format_endian = REGMAP_ENDIAN_BIG,
322 .cache_type = REGCACHE_MAPLE,
323 .use_single_read = true,
324 .use_single_write = true,
325};
326
327static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name)
328{
329 struct device *hwmon_dev;
330 struct tmp108 *tmp108;
331 u32 config;
332 int err;
333
334 tmp108 = devm_kzalloc(dev, sizeof(*tmp108), GFP_KERNEL);
335 if (!tmp108)
336 return -ENOMEM;
337
338 dev_set_drvdata(dev, tmp108);
339 tmp108->regmap = regmap;
340
341 err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config);
342 if (err < 0) {
343 dev_err(dev, "error reading config register: %d", err);
344 return err;
345 }
346 tmp108->orig_config = config;
347
348 /* Only continuous mode is supported. */
349 config &= ~TMP108_CONF_MODE_MASK;
350 config |= TMP108_MODE_CONTINUOUS;
351
352 /* Only comparator mode is supported. */
353 config &= ~TMP108_CONF_TM;
354
355 err = regmap_write(tmp108->regmap, TMP108_REG_CONF, config);
356 if (err < 0) {
357 dev_err(dev, "error writing config register: %d", err);
358 return err;
359 }
360
361 tmp108->ready_time = jiffies;
362 if ((tmp108->orig_config & TMP108_CONF_MODE_MASK) ==
363 TMP108_MODE_SHUTDOWN)
364 tmp108->ready_time +=
365 msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
366
367 err = devm_add_action_or_reset(dev, tmp108_restore_config, tmp108);
368 if (err) {
369 dev_err(dev, "add action or reset failed: %d", err);
370 return err;
371 }
372
373 hwmon_dev = devm_hwmon_device_register_with_info(dev, name,
374 tmp108,
375 &tmp108_chip_info,
376 NULL);
377 return PTR_ERR_OR_ZERO(hwmon_dev);
378}
379
380static int tmp108_probe(struct i2c_client *client)
381{
382 struct device *dev = &client->dev;
383 struct regmap *regmap;
384
385 if (!i2c_check_functionality(client->adapter,
386 I2C_FUNC_SMBUS_WORD_DATA))
387 return dev_err_probe(dev, -ENODEV,
388 "adapter doesn't support SMBus word transactions\n");
389
390 regmap = devm_regmap_init_i2c(client, &tmp108_regmap_config);
391 if (IS_ERR(regmap))
392 return dev_err_probe(dev, PTR_ERR(regmap), "regmap init failed");
393
394 return tmp108_common_probe(dev, regmap, client->name);
395}
396
397static int tmp108_suspend(struct device *dev)
398{
399 struct tmp108 *tmp108 = dev_get_drvdata(dev);
400
401 return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
402 TMP108_CONF_MODE_MASK, TMP108_MODE_SHUTDOWN);
403}
404
405static int tmp108_resume(struct device *dev)
406{
407 struct tmp108 *tmp108 = dev_get_drvdata(dev);
408 int err;
409
410 err = regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
411 TMP108_CONF_MODE_MASK, TMP108_MODE_CONTINUOUS);
412 tmp108->ready_time = jiffies +
413 msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
414 return err;
415}
416
417static DEFINE_SIMPLE_DEV_PM_OPS(tmp108_dev_pm_ops, tmp108_suspend, tmp108_resume);
418
419static const struct i2c_device_id tmp108_i2c_ids[] = {
420 { "tmp108" },
421 { }
422};
423MODULE_DEVICE_TABLE(i2c, tmp108_i2c_ids);
424
425#ifdef CONFIG_OF
426static const struct of_device_id tmp108_of_ids[] = {
427 { .compatible = "nxp,p3t1085", },
428 { .compatible = "ti,tmp108", },
429 {}
430};
431MODULE_DEVICE_TABLE(of, tmp108_of_ids);
432#endif
433
434static struct i2c_driver tmp108_driver = {
435 .driver = {
436 .name = DRIVER_NAME,
437 .pm = pm_sleep_ptr(&tmp108_dev_pm_ops),
438 .of_match_table = of_match_ptr(tmp108_of_ids),
439 },
440 .probe = tmp108_probe,
441 .id_table = tmp108_i2c_ids,
442};
443
444static const struct i3c_device_id p3t1085_i3c_ids[] = {
445 I3C_DEVICE(0x011b, 0x1529, NULL),
446 {}
447};
448MODULE_DEVICE_TABLE(i3c, p3t1085_i3c_ids);
449
450static int p3t1085_i3c_probe(struct i3c_device *i3cdev)
451{
452 struct device *dev = i3cdev_to_dev(i3cdev);
453 struct regmap *regmap;
454
455 regmap = devm_regmap_init_i3c(i3cdev, &tmp108_regmap_config);
456 if (IS_ERR(regmap))
457 return dev_err_probe(dev, PTR_ERR(regmap),
458 "Failed to register i3c regmap\n");
459
460 return tmp108_common_probe(dev, regmap, "p3t1085_i3c");
461}
462
463static struct i3c_driver p3t1085_driver = {
464 .driver = {
465 .name = "p3t1085_i3c",
466 },
467 .probe = p3t1085_i3c_probe,
468 .id_table = p3t1085_i3c_ids,
469};
470
471module_i3c_i2c_driver(p3t1085_driver, &tmp108_driver)
472
473MODULE_AUTHOR("John Muir <john@jmuir.com>");
474MODULE_DESCRIPTION("Texas Instruments TMP108 temperature sensor driver");
475MODULE_LICENSE("GPL");