1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/* Driver for the Texas Instruments TMP464 SMBus temperature sensor IC.
4 * Supported models: TMP464, TMP468
5
6 * Copyright (C) 2022 Agathe Porte <agathe.porte@nokia.com>
7 * Preliminary support by:
8 * Lionel Pouliquen <lionel.lp.pouliquen@nokia.com>
9 */
10
11#include <linux/err.h>
12#include <linux/hwmon.h>
13#include <linux/i2c.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/regmap.h>
18#include <linux/slab.h>
19
20/* Addresses to scan */
21static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, I2C_CLIENT_END };
22
23#define TMP464_NUM_CHANNELS 5 /* chan 0 is internal, 1-4 are remote */
24#define TMP468_NUM_CHANNELS 9 /* chan 0 is internal, 1-8 are remote */
25
26#define MAX_CHANNELS 9
27
28#define TMP464_TEMP_REG(channel) (channel)
29#define TMP464_TEMP_OFFSET_REG(channel) (0x40 + ((channel) - 1) * 8)
30#define TMP464_N_FACTOR_REG(channel) (0x41 + ((channel) - 1) * 8)
31
32static const u8 TMP464_THERM_LIMIT[MAX_CHANNELS] = {
33 0x39, 0x42, 0x4A, 0x52, 0x5A, 0x62, 0x6a, 0x72, 0x7a };
34static const u8 TMP464_THERM2_LIMIT[MAX_CHANNELS] = {
35 0x3A, 0x43, 0x4B, 0x53, 0x5B, 0x63, 0x6b, 0x73, 0x7b };
36
37#define TMP464_THERM_STATUS_REG 0x21
38#define TMP464_THERM2_STATUS_REG 0x22
39#define TMP464_REMOTE_OPEN_REG 0x23
40#define TMP464_CONFIG_REG 0x30
41#define TMP464_TEMP_HYST_REG 0x38
42#define TMP464_LOCK_REG 0xc4
43
44/* Identification */
45#define TMP464_MANUFACTURER_ID_REG 0xFE
46#define TMP464_DEVICE_ID_REG 0xFF
47
48/* Flags */
49#define TMP464_CONFIG_SHUTDOWN BIT(5)
50#define TMP464_CONFIG_RANGE 0x04
51#define TMP464_CONFIG_REG_REN(x) (BIT(7 + (x)))
52#define TMP464_CONFIG_REG_REN_MASK GENMASK(15, 7)
53#define TMP464_CONFIG_CONVERSION_RATE_B0 2
54#define TMP464_CONFIG_CONVERSION_RATE_B2 4
55#define TMP464_CONFIG_CONVERSION_RATE_MASK GENMASK(TMP464_CONFIG_CONVERSION_RATE_B2, \
56 TMP464_CONFIG_CONVERSION_RATE_B0)
57
58#define TMP464_UNLOCK_VAL 0xeb19
59#define TMP464_LOCK_VAL 0x5ca6
60#define TMP464_LOCKED 0x8000
61
62/* Manufacturer / Device ID's */
63#define TMP464_MANUFACTURER_ID 0x5449
64#define TMP464_DEVICE_ID 0x1468
65#define TMP468_DEVICE_ID 0x0468
66
67static const struct i2c_device_id tmp464_id[] = {
68 { "tmp464", TMP464_NUM_CHANNELS },
69 { "tmp468", TMP468_NUM_CHANNELS },
70 { }
71};
72MODULE_DEVICE_TABLE(i2c, tmp464_id);
73
74static const struct of_device_id __maybe_unused tmp464_of_match[] = {
75 {
76 .compatible = "ti,tmp464",
77 .data = (void *)TMP464_NUM_CHANNELS
78 },
79 {
80 .compatible = "ti,tmp468",
81 .data = (void *)TMP468_NUM_CHANNELS
82 },
83 {},
84};
85MODULE_DEVICE_TABLE(of, tmp464_of_match);
86
87struct tmp464_channel {
88 const char *label;
89 bool enabled;
90};
91
92struct tmp464_data {
93 struct regmap *regmap;
94 int channels;
95 s16 config_orig;
96 u16 open_reg;
97 unsigned long last_updated;
98 bool valid;
99 int update_interval;
100 struct tmp464_channel channel[MAX_CHANNELS];
101};
102
103static int temp_from_reg(s16 reg)
104{
105 return DIV_ROUND_CLOSEST((reg >> 3) * 625, 10);
106}
107
108static s16 temp_to_limit_reg(long temp)
109{
110 return DIV_ROUND_CLOSEST(temp, 500) << 6;
111}
112
113static s16 temp_to_offset_reg(long temp)
114{
115 return DIV_ROUND_CLOSEST(temp * 10, 625) << 3;
116}
117
118static int tmp464_enable_channels(struct tmp464_data *data)
119{
120 struct regmap *regmap = data->regmap;
121 u16 enable = 0;
122 int i;
123
124 for (i = 0; i < data->channels; i++)
125 if (data->channel[i].enabled)
126 enable |= TMP464_CONFIG_REG_REN(i);
127
128 return regmap_update_bits(map: regmap, TMP464_CONFIG_REG, TMP464_CONFIG_REG_REN_MASK, val: enable);
129}
130
131static int tmp464_chip_read(struct device *dev, u32 attr, int channel, long *val)
132{
133 struct tmp464_data *data = dev_get_drvdata(dev);
134
135 switch (attr) {
136 case hwmon_chip_update_interval:
137 *val = data->update_interval;
138 return 0;
139 default:
140 return -EOPNOTSUPP;
141 }
142}
143
144static int tmp464_temp_read(struct device *dev, u32 attr, int channel, long *val)
145{
146 struct tmp464_data *data = dev_get_drvdata(dev);
147 struct regmap *regmap = data->regmap;
148 unsigned int regs[2];
149 unsigned int regval;
150 u16 regvals[2];
151 int err = 0;
152
153 switch (attr) {
154 case hwmon_temp_max_alarm:
155 err = regmap_read(map: regmap, TMP464_THERM_STATUS_REG, val: &regval);
156 if (err < 0)
157 break;
158 *val = !!(regval & BIT(channel + 7));
159 break;
160 case hwmon_temp_crit_alarm:
161 err = regmap_read(map: regmap, TMP464_THERM2_STATUS_REG, val: &regval);
162 if (err < 0)
163 break;
164 *val = !!(regval & BIT(channel + 7));
165 break;
166 case hwmon_temp_fault:
167 /*
168 * The chip clears TMP464_REMOTE_OPEN_REG after it is read
169 * and only updates it after the next measurement cycle is
170 * complete. That means we have to cache the value internally
171 * for one measurement cycle and report the cached value.
172 */
173 if (!data->valid || time_after(jiffies, data->last_updated +
174 msecs_to_jiffies(data->update_interval))) {
175 err = regmap_read(map: regmap, TMP464_REMOTE_OPEN_REG, val: &regval);
176 if (err < 0)
177 break;
178 data->open_reg = regval;
179 data->last_updated = jiffies;
180 data->valid = true;
181 }
182 *val = !!(data->open_reg & BIT(channel + 7));
183 break;
184 case hwmon_temp_max_hyst:
185 regs[0] = TMP464_THERM_LIMIT[channel];
186 regs[1] = TMP464_TEMP_HYST_REG;
187 err = regmap_multi_reg_read(map: regmap, reg: regs, val: regvals, val_count: 2);
188 if (err < 0)
189 break;
190 *val = temp_from_reg(reg: regvals[0] - regvals[1]);
191 break;
192 case hwmon_temp_max:
193 err = regmap_read(map: regmap, reg: TMP464_THERM_LIMIT[channel], val: &regval);
194 if (err < 0)
195 break;
196 *val = temp_from_reg(reg: regval);
197 break;
198 case hwmon_temp_crit_hyst:
199 regs[0] = TMP464_THERM2_LIMIT[channel];
200 regs[1] = TMP464_TEMP_HYST_REG;
201 err = regmap_multi_reg_read(map: regmap, reg: regs, val: regvals, val_count: 2);
202 if (err < 0)
203 break;
204 *val = temp_from_reg(reg: regvals[0] - regvals[1]);
205 break;
206 case hwmon_temp_crit:
207 err = regmap_read(map: regmap, reg: TMP464_THERM2_LIMIT[channel], val: &regval);
208 if (err < 0)
209 break;
210 *val = temp_from_reg(reg: regval);
211 break;
212 case hwmon_temp_offset:
213 err = regmap_read(map: regmap, TMP464_TEMP_OFFSET_REG(channel), val: &regval);
214 if (err < 0)
215 break;
216 *val = temp_from_reg(reg: regval);
217 break;
218 case hwmon_temp_input:
219 if (!data->channel[channel].enabled) {
220 err = -ENODATA;
221 break;
222 }
223 err = regmap_read(map: regmap, TMP464_TEMP_REG(channel), val: &regval);
224 if (err < 0)
225 break;
226 *val = temp_from_reg(reg: regval);
227 break;
228 case hwmon_temp_enable:
229 *val = data->channel[channel].enabled;
230 break;
231 default:
232 err = -EOPNOTSUPP;
233 break;
234 }
235
236 return err;
237}
238
239static int tmp464_read(struct device *dev, enum hwmon_sensor_types type,
240 u32 attr, int channel, long *val)
241{
242 switch (type) {
243 case hwmon_chip:
244 return tmp464_chip_read(dev, attr, channel, val);
245 case hwmon_temp:
246 return tmp464_temp_read(dev, attr, channel, val);
247 default:
248 return -EOPNOTSUPP;
249 }
250}
251
252static int tmp464_read_string(struct device *dev, enum hwmon_sensor_types type,
253 u32 attr, int channel, const char **str)
254{
255 struct tmp464_data *data = dev_get_drvdata(dev);
256
257 *str = data->channel[channel].label;
258
259 return 0;
260}
261
262static int tmp464_set_convrate(struct tmp464_data *data, long interval)
263{
264 int rate;
265
266 /*
267 * For valid rates, interval in milli-seconds can be calculated as
268 * interval = 125 << (7 - rate);
269 * or
270 * interval = (1 << (7 - rate)) * 125;
271 * The rate is therefore
272 * rate = 7 - __fls(interval / 125);
273 * and the rounded rate is
274 * rate = 7 - __fls(interval * 4 / (125 * 3));
275 * Use clamp_val() to avoid overflows, and to ensure valid input
276 * for __fls.
277 */
278 interval = clamp_val(interval, 125, 16000);
279 rate = 7 - __fls(word: interval * 4 / (125 * 3));
280 data->update_interval = 125 << (7 - rate);
281
282 return regmap_update_bits(map: data->regmap, TMP464_CONFIG_REG,
283 TMP464_CONFIG_CONVERSION_RATE_MASK,
284 val: rate << TMP464_CONFIG_CONVERSION_RATE_B0);
285}
286
287static int tmp464_chip_write(struct tmp464_data *data, u32 attr, int channel, long val)
288{
289 switch (attr) {
290 case hwmon_chip_update_interval:
291 return tmp464_set_convrate(data, interval: val);
292 default:
293 return -EOPNOTSUPP;
294 }
295}
296
297static int tmp464_temp_write(struct tmp464_data *data, u32 attr, int channel, long val)
298{
299 struct regmap *regmap = data->regmap;
300 unsigned int regval;
301 int err = 0;
302
303 switch (attr) {
304 case hwmon_temp_max_hyst:
305 err = regmap_read(map: regmap, reg: TMP464_THERM_LIMIT[0], val: &regval);
306 if (err < 0)
307 break;
308 val = clamp_val(val, -256000, 256000); /* prevent overflow/underflow */
309 val = clamp_val(temp_from_reg(regval) - val, 0, 255000);
310 err = regmap_write(map: regmap, TMP464_TEMP_HYST_REG,
311 DIV_ROUND_CLOSEST(val, 1000) << 7);
312 break;
313 case hwmon_temp_max:
314 val = temp_to_limit_reg(clamp_val(val, -255000, 255500));
315 err = regmap_write(map: regmap, reg: TMP464_THERM_LIMIT[channel], val);
316 break;
317 case hwmon_temp_crit:
318 val = temp_to_limit_reg(clamp_val(val, -255000, 255500));
319 err = regmap_write(map: regmap, reg: TMP464_THERM2_LIMIT[channel], val);
320 break;
321 case hwmon_temp_offset:
322 val = temp_to_offset_reg(clamp_val(val, -128000, 127937));
323 err = regmap_write(map: regmap, TMP464_TEMP_OFFSET_REG(channel), val);
324 break;
325 case hwmon_temp_enable:
326 data->channel[channel].enabled = !!val;
327 err = tmp464_enable_channels(data);
328 break;
329 default:
330 err = -EOPNOTSUPP;
331 break;
332 }
333
334 return err;
335}
336
337static int tmp464_write(struct device *dev, enum hwmon_sensor_types type,
338 u32 attr, int channel, long val)
339{
340 struct tmp464_data *data = dev_get_drvdata(dev);
341 int err;
342
343 switch (type) {
344 case hwmon_chip:
345 err = tmp464_chip_write(data, attr, channel, val);
346 break;
347 case hwmon_temp:
348 err = tmp464_temp_write(data, attr, channel, val);
349 break;
350 default:
351 err = -EOPNOTSUPP;
352 break;
353 }
354
355 return err;
356}
357
358static umode_t tmp464_is_visible(const void *_data, enum hwmon_sensor_types type,
359 u32 attr, int channel)
360{
361 const struct tmp464_data *data = _data;
362
363 if (channel >= data->channels)
364 return 0;
365
366 if (type == hwmon_chip) {
367 if (attr == hwmon_chip_update_interval)
368 return 0644;
369 return 0;
370 }
371
372 switch (attr) {
373 case hwmon_temp_input:
374 case hwmon_temp_max_alarm:
375 case hwmon_temp_crit_alarm:
376 case hwmon_temp_crit_hyst:
377 return 0444;
378 case hwmon_temp_enable:
379 case hwmon_temp_max:
380 case hwmon_temp_crit:
381 return 0644;
382 case hwmon_temp_max_hyst:
383 if (!channel)
384 return 0644;
385 return 0444;
386 case hwmon_temp_label:
387 if (data->channel[channel].label)
388 return 0444;
389 return 0;
390 case hwmon_temp_fault:
391 if (channel)
392 return 0444;
393 return 0;
394 case hwmon_temp_offset:
395 if (channel)
396 return 0644;
397 return 0;
398 default:
399 return 0;
400 }
401}
402
403static void tmp464_restore_lock(void *regmap)
404{
405 regmap_write(map: regmap, TMP464_LOCK_REG, TMP464_LOCK_VAL);
406}
407
408static void tmp464_restore_config(void *_data)
409{
410 struct tmp464_data *data = _data;
411
412 regmap_write(map: data->regmap, TMP464_CONFIG_REG, val: data->config_orig);
413}
414
415static int tmp464_init_client(struct device *dev, struct tmp464_data *data)
416{
417 struct regmap *regmap = data->regmap;
418 unsigned int regval;
419 int err;
420
421 err = regmap_read(map: regmap, TMP464_LOCK_REG, val: &regval);
422 if (err)
423 return err;
424 if (regval == TMP464_LOCKED) {
425 /* Explicitly unlock chip if it is locked */
426 err = regmap_write(map: regmap, TMP464_LOCK_REG, TMP464_UNLOCK_VAL);
427 if (err)
428 return err;
429 /* and lock it again when unloading the driver */
430 err = devm_add_action_or_reset(dev, tmp464_restore_lock, regmap);
431 if (err)
432 return err;
433 }
434
435 err = regmap_read(map: regmap, TMP464_CONFIG_REG, val: &regval);
436 if (err)
437 return err;
438 data->config_orig = regval;
439 err = devm_add_action_or_reset(dev, tmp464_restore_config, data);
440 if (err)
441 return err;
442
443 /* Default to 500 ms update interval */
444 err = regmap_update_bits(map: regmap, TMP464_CONFIG_REG,
445 TMP464_CONFIG_CONVERSION_RATE_MASK | TMP464_CONFIG_SHUTDOWN,
446 BIT(TMP464_CONFIG_CONVERSION_RATE_B0) |
447 BIT(TMP464_CONFIG_CONVERSION_RATE_B2));
448 if (err)
449 return err;
450
451 data->update_interval = 500;
452
453 return tmp464_enable_channels(data);
454}
455
456static int tmp464_detect(struct i2c_client *client,
457 struct i2c_board_info *info)
458{
459 struct i2c_adapter *adapter = client->adapter;
460 char *name, *chip;
461 int reg;
462
463 if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_WORD_DATA))
464 return -ENODEV;
465
466 reg = i2c_smbus_read_word_swapped(client, TMP464_MANUFACTURER_ID_REG);
467 if (reg < 0)
468 return reg;
469 if (reg != TMP464_MANUFACTURER_ID)
470 return -ENODEV;
471
472 /* Check for "always return zero" bits */
473 reg = i2c_smbus_read_word_swapped(client, TMP464_THERM_STATUS_REG);
474 if (reg < 0)
475 return reg;
476 if (reg & 0x1f)
477 return -ENODEV;
478 reg = i2c_smbus_read_word_swapped(client, TMP464_THERM2_STATUS_REG);
479 if (reg < 0)
480 return reg;
481 if (reg & 0x1f)
482 return -ENODEV;
483
484 reg = i2c_smbus_read_word_swapped(client, TMP464_DEVICE_ID_REG);
485 if (reg < 0)
486 return reg;
487 switch (reg) {
488 case TMP464_DEVICE_ID:
489 name = "tmp464";
490 chip = "TMP464";
491 break;
492 case TMP468_DEVICE_ID:
493 name = "tmp468";
494 chip = "TMP468";
495 break;
496 default:
497 return -ENODEV;
498 }
499
500 strscpy(info->type, name, I2C_NAME_SIZE);
501 dev_info(&adapter->dev, "Detected TI %s chip at 0x%02x\n", chip, client->addr);
502
503 return 0;
504}
505
506static int tmp464_probe_child_from_dt(struct device *dev,
507 struct device_node *child,
508 struct tmp464_data *data)
509
510{
511 struct regmap *regmap = data->regmap;
512 u32 channel;
513 s32 nfactor;
514 int err;
515
516 err = of_property_read_u32(np: child, propname: "reg", out_value: &channel);
517 if (err) {
518 dev_err(dev, "missing reg property of %pOFn\n", child);
519 return err;
520 }
521
522 if (channel >= data->channels) {
523 dev_err(dev, "invalid reg %d of %pOFn\n", channel, child);
524 return -EINVAL;
525 }
526
527 of_property_read_string(np: child, propname: "label", out_string: &data->channel[channel].label);
528
529 data->channel[channel].enabled = of_device_is_available(device: child);
530
531 err = of_property_read_s32(np: child, propname: "ti,n-factor", out_value: &nfactor);
532 if (err && err != -EINVAL)
533 return err;
534 if (!err) {
535 if (channel == 0) {
536 dev_err(dev, "n-factor can't be set for internal channel\n");
537 return -EINVAL;
538 }
539 if (nfactor > 127 || nfactor < -128) {
540 dev_err(dev, "n-factor for channel %d invalid (%d)\n",
541 channel, nfactor);
542 return -EINVAL;
543 }
544 err = regmap_write(map: regmap, TMP464_N_FACTOR_REG(channel),
545 val: (nfactor << 8) & 0xff00);
546 if (err)
547 return err;
548 }
549
550 return 0;
551}
552
553static int tmp464_probe_from_dt(struct device *dev, struct tmp464_data *data)
554{
555 const struct device_node *np = dev->of_node;
556 int err;
557
558 for_each_child_of_node_scoped(np, child) {
559 if (strcmp(child->name, "channel"))
560 continue;
561
562 err = tmp464_probe_child_from_dt(dev, child, data);
563 if (err)
564 return err;
565 }
566
567 return 0;
568}
569
570static const struct hwmon_ops tmp464_ops = {
571 .is_visible = tmp464_is_visible,
572 .read = tmp464_read,
573 .read_string = tmp464_read_string,
574 .write = tmp464_write,
575};
576
577static const struct hwmon_channel_info * const tmp464_info[] = {
578 HWMON_CHANNEL_INFO(chip,
579 HWMON_C_UPDATE_INTERVAL),
580 HWMON_CHANNEL_INFO(temp,
581 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
582 HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
583 HWMON_T_LABEL | HWMON_T_ENABLE,
584 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
585 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
586 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE,
587 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
588 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
589 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE,
590 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
591 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
592 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE,
593 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
594 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
595 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE,
596 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
597 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
598 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE,
599 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
600 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
601 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE,
602 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
603 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
604 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE,
605 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST |
606 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM |
607 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE),
608 NULL
609};
610
611static const struct hwmon_chip_info tmp464_chip_info = {
612 .ops = &tmp464_ops,
613 .info = tmp464_info,
614};
615
616/* regmap */
617
618static bool tmp464_is_volatile_reg(struct device *dev, unsigned int reg)
619{
620 return (reg < TMP464_TEMP_REG(TMP468_NUM_CHANNELS) ||
621 reg == TMP464_THERM_STATUS_REG ||
622 reg == TMP464_THERM2_STATUS_REG ||
623 reg == TMP464_REMOTE_OPEN_REG);
624}
625
626static const struct regmap_config tmp464_regmap_config = {
627 .reg_bits = 8,
628 .val_bits = 16,
629 .max_register = TMP464_DEVICE_ID_REG,
630 .volatile_reg = tmp464_is_volatile_reg,
631 .val_format_endian = REGMAP_ENDIAN_BIG,
632 .cache_type = REGCACHE_MAPLE,
633 .use_single_read = true,
634 .use_single_write = true,
635};
636
637static int tmp464_probe(struct i2c_client *client)
638{
639 struct device *dev = &client->dev;
640 struct device *hwmon_dev;
641 struct tmp464_data *data;
642 int i, err;
643
644 if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
645 dev_err(&client->dev, "i2c functionality check failed\n");
646 return -ENODEV;
647 }
648 data = devm_kzalloc(dev, size: sizeof(struct tmp464_data), GFP_KERNEL);
649 if (!data)
650 return -ENOMEM;
651
652 data->channels = (int)(unsigned long)i2c_get_match_data(client);
653
654 data->regmap = devm_regmap_init_i2c(client, &tmp464_regmap_config);
655 if (IS_ERR(ptr: data->regmap))
656 return PTR_ERR(ptr: data->regmap);
657
658 for (i = 0; i < data->channels; i++)
659 data->channel[i].enabled = true;
660
661 err = tmp464_init_client(dev, data);
662 if (err)
663 return err;
664
665 if (dev->of_node) {
666 err = tmp464_probe_from_dt(dev, data);
667 if (err)
668 return err;
669 }
670
671 hwmon_dev = devm_hwmon_device_register_with_info(dev, name: client->name,
672 drvdata: data, info: &tmp464_chip_info, NULL);
673 return PTR_ERR_OR_ZERO(ptr: hwmon_dev);
674}
675
676static struct i2c_driver tmp464_driver = {
677 .class = I2C_CLASS_HWMON,
678 .driver = {
679 .name = "tmp464",
680 .of_match_table = of_match_ptr(tmp464_of_match),
681 },
682 .probe = tmp464_probe,
683 .id_table = tmp464_id,
684 .detect = tmp464_detect,
685 .address_list = normal_i2c,
686};
687
688module_i2c_driver(tmp464_driver);
689
690MODULE_AUTHOR("Agathe Porte <agathe.porte@nokia.com>");
691MODULE_DESCRIPTION("Texas Instruments TMP464 temperature sensor driver");
692MODULE_LICENSE("GPL");
693

source code of linux/drivers/hwmon/tmp464.c