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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / hwmon / pmbus / ltc2978.c
blobf01f4887fb2e6b92d416d17a8ea75233bdd1ca91
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Hardware monitoring driver for LTC2978 and compatible chips.
4 *
5 * Copyright (c) 2011 Ericsson AB.
6 * Copyright (c) 2013, 2014, 2015 Guenter Roeck
7 * Copyright (c) 2015 Linear Technology
8 * Copyright (c) 2018 Analog Devices Inc.
9 */
10
11 #include <linux/delay.h>
12 #include <linux/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/i2c.h>
19 #include <linux/regulator/driver.h>
20 #include "pmbus.h"
21
22 enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
23 ltc3883, ltc3886, ltc3887, ltm2987, ltm4675, ltm4676, ltm4686 };
24
25 /* Common for all chips */
26 #define LTC2978_MFR_VOUT_PEAK 0xdd
27 #define LTC2978_MFR_VIN_PEAK 0xde
28 #define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
29 #define LTC2978_MFR_SPECIAL_ID 0xe7 /* Undocumented on LTC3882 */
30 #define LTC2978_MFR_COMMON 0xef
31
32 /* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */
33 #define LTC2978_MFR_VOUT_MIN 0xfb
34 #define LTC2978_MFR_VIN_MIN 0xfc
35 #define LTC2978_MFR_TEMPERATURE_MIN 0xfd
36
37 /* LTC2974, LTC2975 */
38 #define LTC2974_MFR_IOUT_PEAK 0xd7
39 #define LTC2974_MFR_IOUT_MIN 0xd8
40
41 /* LTC3880, LTC3882, LTC3883, LTC3887, LTM4675, and LTM4676 */
42 #define LTC3880_MFR_IOUT_PEAK 0xd7
43 #define LTC3880_MFR_CLEAR_PEAKS 0xe3
44 #define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
45
46 /* LTC3883 and LTC3886 only */
47 #define LTC3883_MFR_IIN_PEAK 0xe1
48
49 /* LTC2975 only */
50 #define LTC2975_MFR_IIN_PEAK 0xc4
51 #define LTC2975_MFR_IIN_MIN 0xc5
52 #define LTC2975_MFR_PIN_PEAK 0xc6
53 #define LTC2975_MFR_PIN_MIN 0xc7
54
55 #define LTC2978_ID_MASK 0xfff0
56
57 #define LTC2974_ID 0x0210
58 #define LTC2975_ID 0x0220
59 #define LTC2977_ID 0x0130
60 #define LTC2978_ID_REV1 0x0110 /* Early revision */
61 #define LTC2978_ID_REV2 0x0120
62 #define LTC2980_ID_A 0x8030 /* A/B for two die IDs */
63 #define LTC2980_ID_B 0x8040
64 #define LTC3880_ID 0x4020
65 #define LTC3882_ID 0x4200
66 #define LTC3882_ID_D1 0x4240 /* Dash 1 */
67 #define LTC3883_ID 0x4300
68 #define LTC3886_ID 0x4600
69 #define LTC3887_ID 0x4700
70 #define LTM2987_ID_A 0x8010 /* A/B for two die IDs */
71 #define LTM2987_ID_B 0x8020
72 #define LTM4675_ID 0x47a0
73 #define LTM4676_ID_REV1 0x4400
74 #define LTM4676_ID_REV2 0x4480
75 #define LTM4676A_ID 0x47e0
76 #define LTM4686_ID 0x4770
77
78 #define LTC2974_NUM_PAGES 4
79 #define LTC2978_NUM_PAGES 8
80 #define LTC3880_NUM_PAGES 2
81 #define LTC3883_NUM_PAGES 1
82
83 #define LTC_POLL_TIMEOUT 100 /* in milli-seconds */
84
85 #define LTC_NOT_BUSY BIT(5)
86 #define LTC_NOT_PENDING BIT(4)
87
88 /*
89 * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
90 * happens pretty much each time chip data is updated. Raw peak data therefore
91 * does not provide much value. To be able to provide useful peak data, keep an
92 * internal cache of measured peak data, which is only cleared if an explicit
93 * "clear peak" command is executed for the sensor in question.
94 */
95
96 struct ltc2978_data {
97 enum chips id;
98 u16 vin_min, vin_max;
99 u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
100 u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
101 u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
102 u16 iin_min, iin_max;
103 u16 pin_min, pin_max;
104 u16 temp2_max;
105 struct pmbus_driver_info info;
106 u32 features;
107 };
108 #define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info)
109
110 #define FEAT_CLEAR_PEAKS BIT(0)
111 #define FEAT_NEEDS_POLLING BIT(1)
112
113 #define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS)
114 #define needs_polling(d) ((d)->features & FEAT_NEEDS_POLLING)
115
116 static int ltc_wait_ready(struct i2c_client *client)
117 {
118 unsigned long timeout = jiffies + msecs_to_jiffies(LTC_POLL_TIMEOUT);
119 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
120 struct ltc2978_data *data = to_ltc2978_data(info);
121 int status;
122 u8 mask;
123
124 if (!needs_polling(data))
125 return 0;
126
127 /*
128 * LTC3883 does not support LTC_NOT_PENDING, even though
129 * the datasheet claims that it does.
130 */
131 mask = LTC_NOT_BUSY;
132 if (data->id != ltc3883)
133 mask |= LTC_NOT_PENDING;
134
135 do {
136 status = pmbus_read_byte_data(client, 0, LTC2978_MFR_COMMON);
137 if (status == -EBADMSG || status == -ENXIO) {
138 /* PEC error or NACK: chip may be busy, try again */
139 usleep_range(50, 100);
140 continue;
141 }
142 if (status < 0)
143 return status;
144
145 if ((status & mask) == mask)
146 return 0;
147
148 usleep_range(50, 100);
149 } while (time_before(jiffies, timeout));
150
151 return -ETIMEDOUT;
152 }
153
154 static int ltc_read_word_data(struct i2c_client *client, int page, int reg)
155 {
156 int ret;
157
158 ret = ltc_wait_ready(client);
159 if (ret < 0)
160 return ret;
161
162 return pmbus_read_word_data(client, page, reg);
163 }
164
165 static int ltc_read_byte_data(struct i2c_client *client, int page, int reg)
166 {
167 int ret;
168
169 ret = ltc_wait_ready(client);
170 if (ret < 0)
171 return ret;
172
173 return pmbus_read_byte_data(client, page, reg);
174 }
175
176 static int ltc_write_byte(struct i2c_client *client, int page, u8 byte)
177 {
178 int ret;
179
180 ret = ltc_wait_ready(client);
181 if (ret < 0)
182 return ret;
183
184 return pmbus_write_byte(client, page, byte);
185 }
186
187 static inline int lin11_to_val(int data)
188 {
189 s16 e = ((s16)data) >> 11;
190 s32 m = (((s16)(data << 5)) >> 5);
191
192 /*
193 * mantissa is 10 bit + sign, exponent adds up to 15 bit.
194 * Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31).
195 */
196 e += 6;
197 return (e < 0 ? m >> -e : m << e);
198 }
199
200 static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client,
201 int page, int reg, u16 *pmax)
202 {
203 int ret;
204
205 ret = ltc_read_word_data(client, page, reg);
206 if (ret >= 0) {
207 if (lin11_to_val(ret) > lin11_to_val(*pmax))
208 *pmax = ret;
209 ret = *pmax;
210 }
211 return ret;
212 }
213
214 static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client,
215 int page, int reg, u16 *pmin)
216 {
217 int ret;
218
219 ret = ltc_read_word_data(client, page, reg);
220 if (ret >= 0) {
221 if (lin11_to_val(ret) < lin11_to_val(*pmin))
222 *pmin = ret;
223 ret = *pmin;
224 }
225 return ret;
226 }
227
228 static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
229 int reg)
230 {
231 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
232 struct ltc2978_data *data = to_ltc2978_data(info);
233 int ret;
234
235 switch (reg) {
236 case PMBUS_VIRT_READ_VIN_MAX:
237 ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK,
238 &data->vin_max);
239 break;
240 case PMBUS_VIRT_READ_VOUT_MAX:
241 ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_PEAK);
242 if (ret >= 0) {
243 /*
244 * VOUT is 16 bit unsigned with fixed exponent,
245 * so we can compare it directly
246 */
247 if (ret > data->vout_max[page])
248 data->vout_max[page] = ret;
249 ret = data->vout_max[page];
250 }
251 break;
252 case PMBUS_VIRT_READ_TEMP_MAX:
253 ret = ltc_get_max(data, client, page,
254 LTC2978_MFR_TEMPERATURE_PEAK,
255 &data->temp_max[page]);
256 break;
257 case PMBUS_VIRT_RESET_VOUT_HISTORY:
258 case PMBUS_VIRT_RESET_VIN_HISTORY:
259 case PMBUS_VIRT_RESET_TEMP_HISTORY:
260 ret = 0;
261 break;
262 default:
263 ret = ltc_wait_ready(client);
264 if (ret < 0)
265 return ret;
266 ret = -ENODATA;
267 break;
268 }
269 return ret;
270 }
271
272 static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
273 {
274 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
275 struct ltc2978_data *data = to_ltc2978_data(info);
276 int ret;
277
278 switch (reg) {
279 case PMBUS_VIRT_READ_VIN_MIN:
280 ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN,
281 &data->vin_min);
282 break;
283 case PMBUS_VIRT_READ_VOUT_MIN:
284 ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_MIN);
285 if (ret >= 0) {
286 /*
287 * VOUT_MIN is known to not be supported on some lots
288 * of LTC2978 revision 1, and will return the maximum
289 * possible voltage if read. If VOUT_MAX is valid and
290 * lower than the reading of VOUT_MIN, use it instead.
291 */
292 if (data->vout_max[page] && ret > data->vout_max[page])
293 ret = data->vout_max[page];
294 if (ret < data->vout_min[page])
295 data->vout_min[page] = ret;
296 ret = data->vout_min[page];
297 }
298 break;
299 case PMBUS_VIRT_READ_TEMP_MIN:
300 ret = ltc_get_min(data, client, page,
301 LTC2978_MFR_TEMPERATURE_MIN,
302 &data->temp_min[page]);
303 break;
304 case PMBUS_VIRT_READ_IOUT_MAX:
305 case PMBUS_VIRT_RESET_IOUT_HISTORY:
306 case PMBUS_VIRT_READ_TEMP2_MAX:
307 case PMBUS_VIRT_RESET_TEMP2_HISTORY:
308 ret = -ENXIO;
309 break;
310 default:
311 ret = ltc2978_read_word_data_common(client, page, reg);
312 break;
313 }
314 return ret;
315 }
316
317 static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
318 {
319 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
320 struct ltc2978_data *data = to_ltc2978_data(info);
321 int ret;
322
323 switch (reg) {
324 case PMBUS_VIRT_READ_IOUT_MAX:
325 ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK,
326 &data->iout_max[page]);
327 break;
328 case PMBUS_VIRT_READ_IOUT_MIN:
329 ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN,
330 &data->iout_min[page]);
331 break;
332 case PMBUS_VIRT_RESET_IOUT_HISTORY:
333 ret = 0;
334 break;
335 default:
336 ret = ltc2978_read_word_data(client, page, reg);
337 break;
338 }
339 return ret;
340 }
341
342 static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg)
343 {
344 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
345 struct ltc2978_data *data = to_ltc2978_data(info);
346 int ret;
347
348 switch (reg) {
349 case PMBUS_VIRT_READ_IIN_MAX:
350 ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK,
351 &data->iin_max);
352 break;
353 case PMBUS_VIRT_READ_IIN_MIN:
354 ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN,
355 &data->iin_min);
356 break;
357 case PMBUS_VIRT_READ_PIN_MAX:
358 ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK,
359 &data->pin_max);
360 break;
361 case PMBUS_VIRT_READ_PIN_MIN:
362 ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN,
363 &data->pin_min);
364 break;
365 case PMBUS_VIRT_RESET_IIN_HISTORY:
366 case PMBUS_VIRT_RESET_PIN_HISTORY:
367 ret = 0;
368 break;
369 default:
370 ret = ltc2978_read_word_data(client, page, reg);
371 break;
372 }
373 return ret;
374 }
375
376 static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
377 {
378 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
379 struct ltc2978_data *data = to_ltc2978_data(info);
380 int ret;
381
382 switch (reg) {
383 case PMBUS_VIRT_READ_IOUT_MAX:
384 ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK,
385 &data->iout_max[page]);
386 break;
387 case PMBUS_VIRT_READ_TEMP2_MAX:
388 ret = ltc_get_max(data, client, page,
389 LTC3880_MFR_TEMPERATURE2_PEAK,
390 &data->temp2_max);
391 break;
392 case PMBUS_VIRT_READ_VIN_MIN:
393 case PMBUS_VIRT_READ_VOUT_MIN:
394 case PMBUS_VIRT_READ_TEMP_MIN:
395 ret = -ENXIO;
396 break;
397 case PMBUS_VIRT_RESET_IOUT_HISTORY:
398 case PMBUS_VIRT_RESET_TEMP2_HISTORY:
399 ret = 0;
400 break;
401 default:
402 ret = ltc2978_read_word_data_common(client, page, reg);
403 break;
404 }
405 return ret;
406 }
407
408 static int ltc3883_read_word_data(struct i2c_client *client, int page, int reg)
409 {
410 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
411 struct ltc2978_data *data = to_ltc2978_data(info);
412 int ret;
413
414 switch (reg) {
415 case PMBUS_VIRT_READ_IIN_MAX:
416 ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK,
417 &data->iin_max);
418 break;
419 case PMBUS_VIRT_RESET_IIN_HISTORY:
420 ret = 0;
421 break;
422 default:
423 ret = ltc3880_read_word_data(client, page, reg);
424 break;
425 }
426 return ret;
427 }
428
429 static int ltc2978_clear_peaks(struct ltc2978_data *data,
430 struct i2c_client *client, int page)
431 {
432 int ret;
433
434 if (has_clear_peaks(data))
435 ret = ltc_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
436 else
437 ret = ltc_write_byte(client, page, PMBUS_CLEAR_FAULTS);
438
439 return ret;
440 }
441
442 static int ltc2978_write_word_data(struct i2c_client *client, int page,
443 int reg, u16 word)
444 {
445 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
446 struct ltc2978_data *data = to_ltc2978_data(info);
447 int ret;
448
449 switch (reg) {
450 case PMBUS_VIRT_RESET_IIN_HISTORY:
451 data->iin_max = 0x7c00;
452 data->iin_min = 0x7bff;
453 ret = ltc2978_clear_peaks(data, client, 0);
454 break;
455 case PMBUS_VIRT_RESET_PIN_HISTORY:
456 data->pin_max = 0x7c00;
457 data->pin_min = 0x7bff;
458 ret = ltc2978_clear_peaks(data, client, 0);
459 break;
460 case PMBUS_VIRT_RESET_IOUT_HISTORY:
461 data->iout_max[page] = 0x7c00;
462 data->iout_min[page] = 0xfbff;
463 ret = ltc2978_clear_peaks(data, client, page);
464 break;
465 case PMBUS_VIRT_RESET_TEMP2_HISTORY:
466 data->temp2_max = 0x7c00;
467 ret = ltc2978_clear_peaks(data, client, page);
468 break;
469 case PMBUS_VIRT_RESET_VOUT_HISTORY:
470 data->vout_min[page] = 0xffff;
471 data->vout_max[page] = 0;
472 ret = ltc2978_clear_peaks(data, client, page);
473 break;
474 case PMBUS_VIRT_RESET_VIN_HISTORY:
475 data->vin_min = 0x7bff;
476 data->vin_max = 0x7c00;
477 ret = ltc2978_clear_peaks(data, client, page);
478 break;
479 case PMBUS_VIRT_RESET_TEMP_HISTORY:
480 data->temp_min[page] = 0x7bff;
481 data->temp_max[page] = 0x7c00;
482 ret = ltc2978_clear_peaks(data, client, page);
483 break;
484 default:
485 ret = ltc_wait_ready(client);
486 if (ret < 0)
487 return ret;
488 ret = -ENODATA;
489 break;
490 }
491 return ret;
492 }
493
494 static const struct i2c_device_id ltc2978_id[] = {
495 {"ltc2974", ltc2974},
496 {"ltc2975", ltc2975},
497 {"ltc2977", ltc2977},
498 {"ltc2978", ltc2978},
499 {"ltc2980", ltc2980},
500 {"ltc3880", ltc3880},
501 {"ltc3882", ltc3882},
502 {"ltc3883", ltc3883},
503 {"ltc3886", ltc3886},
504 {"ltc3887", ltc3887},
505 {"ltm2987", ltm2987},
506 {"ltm4675", ltm4675},
507 {"ltm4676", ltm4676},
508 {"ltm4686", ltm4686},
509 {}
510 };
511 MODULE_DEVICE_TABLE(i2c, ltc2978_id);
512
513 #if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
514 static const struct regulator_desc ltc2978_reg_desc[] = {
515 PMBUS_REGULATOR("vout", 0),
516 PMBUS_REGULATOR("vout", 1),
517 PMBUS_REGULATOR("vout", 2),
518 PMBUS_REGULATOR("vout", 3),
519 PMBUS_REGULATOR("vout", 4),
520 PMBUS_REGULATOR("vout", 5),
521 PMBUS_REGULATOR("vout", 6),
522 PMBUS_REGULATOR("vout", 7),
523 };
524 #endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
525
526 static int ltc2978_get_id(struct i2c_client *client)
527 {
528 int chip_id;
529
530 chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
531 if (chip_id < 0) {
532 const struct i2c_device_id *id;
533 u8 buf[I2C_SMBUS_BLOCK_MAX];
534 int ret;
535
536 if (!i2c_check_functionality(client->adapter,
537 I2C_FUNC_SMBUS_READ_BLOCK_DATA))
538 return -ENODEV;
539
540 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
541 if (ret < 0)
542 return ret;
543 if (ret < 3 || strncmp(buf, "LTC", 3))
544 return -ENODEV;
545
546 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
547 if (ret < 0)
548 return ret;
549 for (id = &ltc2978_id[0]; strlen(id->name); id++) {
550 if (!strncasecmp(id->name, buf, strlen(id->name)))
551 return (int)id->driver_data;
552 }
553 return -ENODEV;
554 }
555
556 chip_id &= LTC2978_ID_MASK;
557
558 if (chip_id == LTC2974_ID)
559 return ltc2974;
560 else if (chip_id == LTC2975_ID)
561 return ltc2975;
562 else if (chip_id == LTC2977_ID)
563 return ltc2977;
564 else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2)
565 return ltc2978;
566 else if (chip_id == LTC2980_ID_A || chip_id == LTC2980_ID_B)
567 return ltc2980;
568 else if (chip_id == LTC3880_ID)
569 return ltc3880;
570 else if (chip_id == LTC3882_ID || chip_id == LTC3882_ID_D1)
571 return ltc3882;
572 else if (chip_id == LTC3883_ID)
573 return ltc3883;
574 else if (chip_id == LTC3886_ID)
575 return ltc3886;
576 else if (chip_id == LTC3887_ID)
577 return ltc3887;
578 else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
579 return ltm2987;
580 else if (chip_id == LTM4675_ID)
581 return ltm4675;
582 else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
583 chip_id == LTM4676A_ID)
584 return ltm4676;
585 else if (chip_id == LTM4686_ID)
586 return ltm4686;
587
588 dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
589 return -ENODEV;
590 }
591
592 static int ltc2978_probe(struct i2c_client *client,
593 const struct i2c_device_id *id)
594 {
595 int i, chip_id;
596 struct ltc2978_data *data;
597 struct pmbus_driver_info *info;
598
599 if (!i2c_check_functionality(client->adapter,
600 I2C_FUNC_SMBUS_READ_WORD_DATA))
601 return -ENODEV;
602
603 data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data),
604 GFP_KERNEL);
605 if (!data)
606 return -ENOMEM;
607
608 chip_id = ltc2978_get_id(client);
609 if (chip_id < 0)
610 return chip_id;
611
612 data->id = chip_id;
613 if (data->id != id->driver_data)
614 dev_warn(&client->dev,
615 "Device mismatch: Configured %s, detected %s\n",
616 id->name,
617 ltc2978_id[data->id].name);
618
619 info = &data->info;
620 info->write_word_data = ltc2978_write_word_data;
621 info->write_byte = ltc_write_byte;
622 info->read_word_data = ltc_read_word_data;
623 info->read_byte_data = ltc_read_byte_data;
624
625 data->vin_min = 0x7bff;
626 data->vin_max = 0x7c00;
627 for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
628 data->vout_min[i] = 0xffff;
629 for (i = 0; i < ARRAY_SIZE(data->iout_min); i++)
630 data->iout_min[i] = 0xfbff;
631 for (i = 0; i < ARRAY_SIZE(data->iout_max); i++)
632 data->iout_max[i] = 0x7c00;
633 for (i = 0; i < ARRAY_SIZE(data->temp_min); i++)
634 data->temp_min[i] = 0x7bff;
635 for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
636 data->temp_max[i] = 0x7c00;
637 data->temp2_max = 0x7c00;
638
639 switch (data->id) {
640 case ltc2974:
641 info->read_word_data = ltc2974_read_word_data;
642 info->pages = LTC2974_NUM_PAGES;
643 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
644 | PMBUS_HAVE_TEMP2;
645 for (i = 0; i < info->pages; i++) {
646 info->func[i] |= PMBUS_HAVE_VOUT
647 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
648 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
649 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
650 }
651 break;
652 case ltc2975:
653 info->read_word_data = ltc2975_read_word_data;
654 info->pages = LTC2974_NUM_PAGES;
655 info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
656 | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
657 | PMBUS_HAVE_TEMP2;
658 for (i = 0; i < info->pages; i++) {
659 info->func[i] |= PMBUS_HAVE_VOUT
660 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
661 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
662 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
663 }
664 break;
665 case ltc2977:
666 case ltc2978:
667 case ltc2980:
668 case ltm2987:
669 info->read_word_data = ltc2978_read_word_data;
670 info->pages = LTC2978_NUM_PAGES;
671 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
672 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
673 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
674 for (i = 1; i < LTC2978_NUM_PAGES; i++) {
675 info->func[i] = PMBUS_HAVE_VOUT
676 | PMBUS_HAVE_STATUS_VOUT;
677 }
678 break;
679 case ltc3880:
680 case ltc3887:
681 case ltm4675:
682 case ltm4676:
683 case ltm4686:
684 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
685 info->read_word_data = ltc3880_read_word_data;
686 info->pages = LTC3880_NUM_PAGES;
687 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
688 | PMBUS_HAVE_STATUS_INPUT
689 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
690 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
691 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
692 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
693 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
694 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
695 | PMBUS_HAVE_POUT
696 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
697 break;
698 case ltc3882:
699 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
700 info->read_word_data = ltc3880_read_word_data;
701 info->pages = LTC3880_NUM_PAGES;
702 info->func[0] = PMBUS_HAVE_VIN
703 | PMBUS_HAVE_STATUS_INPUT
704 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
705 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
706 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
707 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
708 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
709 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
710 | PMBUS_HAVE_POUT
711 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
712 break;
713 case ltc3883:
714 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
715 info->read_word_data = ltc3883_read_word_data;
716 info->pages = LTC3883_NUM_PAGES;
717 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
718 | PMBUS_HAVE_STATUS_INPUT
719 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
720 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
721 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
722 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
723 break;
724 case ltc3886:
725 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
726 info->read_word_data = ltc3883_read_word_data;
727 info->pages = LTC3880_NUM_PAGES;
728 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
729 | PMBUS_HAVE_STATUS_INPUT
730 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
731 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
732 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
733 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
734 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
735 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
736 | PMBUS_HAVE_POUT
737 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
738 break;
739 default:
740 return -ENODEV;
741 }
742
743 #if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
744 info->num_regulators = info->pages;
745 info->reg_desc = ltc2978_reg_desc;
746 if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
747 dev_err(&client->dev, "num_regulators too large!");
748 info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
749 }
750 #endif
751
752 return pmbus_do_probe(client, id, info);
753 }
754
755 #ifdef CONFIG_OF
756 static const struct of_device_id ltc2978_of_match[] = {
757 { .compatible = "lltc,ltc2974" },
758 { .compatible = "lltc,ltc2975" },
759 { .compatible = "lltc,ltc2977" },
760 { .compatible = "lltc,ltc2978" },
761 { .compatible = "lltc,ltc2980" },
762 { .compatible = "lltc,ltc3880" },
763 { .compatible = "lltc,ltc3882" },
764 { .compatible = "lltc,ltc3883" },
765 { .compatible = "lltc,ltc3886" },
766 { .compatible = "lltc,ltc3887" },
767 { .compatible = "lltc,ltm2987" },
768 { .compatible = "lltc,ltm4675" },
769 { .compatible = "lltc,ltm4676" },
770 { .compatible = "lltc,ltm4686" },
771 { }
772 };
773 MODULE_DEVICE_TABLE(of, ltc2978_of_match);
774 #endif
775
776 static struct i2c_driver ltc2978_driver = {
777 .driver = {
778 .name = "ltc2978",
779 .of_match_table = of_match_ptr(ltc2978_of_match),
780 },
781 .probe = ltc2978_probe,
782 .remove = pmbus_do_remove,
783 .id_table = ltc2978_id,
784 };
785
786 module_i2c_driver(ltc2978_driver);
787
788 MODULE_AUTHOR("Guenter Roeck");
789 MODULE_DESCRIPTION("PMBus driver for LTC2978 and compatible chips");
790 MODULE_LICENSE("GPL");
Linux with added FPC-III support