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Merge tag 'devicetree-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh...
[deliverable/linux.git] / drivers / hwmon / pmbus / ltc2978.c
CommitLineData
c3ff9a67 1/*
649ca820 2 * Hardware monitoring driver for LTC2978 and compatible chips.
c3ff9a67
GR		 3 *
4 * Copyright (c) 2011 Ericsson AB.
649ca820 5 * Copyright (c) 2013, 2014, 2015 Guenter Roeck
e04d1ce9 6 * Copyright (c) 2015 Linear Technology
c3ff9a67
GR		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
c3ff9a67
GR		 17 */
18
e04d1ce9
MJ		 19#include <linux/delay.h>
20#include <linux/jiffies.h>
c3ff9a67
GR		 21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/err.h>
25#include <linux/slab.h>
26#include <linux/i2c.h>
77aa3585 27#include <linux/regulator/driver.h>
c3ff9a67
GR		 28#include "pmbus.h"
29
52aae6af 30enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
ccf2dc51 31 ltc3883, ltc3886, ltc3887, ltm2987, ltm4675, ltm4676 };
c3ff9a67 32
fd9175d2 33/* Common for all chips */
c3ff9a67
GR		 34#define LTC2978_MFR_VOUT_PEAK 0xdd
35#define LTC2978_MFR_VIN_PEAK 0xde
36#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
acb092cd 37#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Undocumented on LTC3882 */
e04d1ce9 38#define LTC2978_MFR_COMMON 0xef
c3ff9a67 39
52aae6af 40/* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */
c3ff9a67
GR		 41#define LTC2978_MFR_VOUT_MIN 0xfb
42#define LTC2978_MFR_VIN_MIN 0xfc
43#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
44
649ca820 45/* LTC2974, LTC2975 */
fd9175d2
GR		 46#define LTC2974_MFR_IOUT_PEAK 0xd7
47#define LTC2974_MFR_IOUT_MIN 0xd8
48
ccf2dc51 49/* LTC3880, LTC3882, LTC3883, LTC3887, LTM4675, and LTM4676 */
ddfb41ca
GR		 50#define LTC3880_MFR_IOUT_PEAK 0xd7
51#define LTC3880_MFR_CLEAR_PEAKS 0xe3
52#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
53
228b687d 54/* LTC3883 and LTC3886 only */
fd9175d2
GR		 55#define LTC3883_MFR_IIN_PEAK 0xe1
56
649ca820
GR		 57/* LTC2975 only */
58#define LTC2975_MFR_IIN_PEAK 0xc4
59#define LTC2975_MFR_IIN_MIN 0xc5
60#define LTC2975_MFR_PIN_PEAK 0xc6
61#define LTC2975_MFR_PIN_MIN 0xc7
62
00c83371
GR		 63#define LTC2978_ID_MASK 0xfff0
64
65#define LTC2974_ID 0x0210
66#define LTC2975_ID 0x0220
c24c407e 67#define LTC2977_ID 0x0130
acb092cd
GR		 68#define LTC2978_ID_REV1 0x0110 /* Early revision */
69#define LTC2978_ID_REV2 0x0120
52aae6af
GR		 70#define LTC2980_ID_A 0x8030 /* A/B for two die IDs */
71#define LTC2980_ID_B 0x8040
00c83371 72#define LTC3880_ID 0x4020
acb092cd
GR		 73#define LTC3882_ID 0x4200
74#define LTC3882_ID_D1 0x4240 /* Dash 1 */
fd9175d2 75#define LTC3883_ID 0x4300
228b687d 76#define LTC3886_ID 0x4600
15398566 77#define LTC3887_ID 0x4700
52aae6af
GR		 78#define LTM2987_ID_A 0x8010 /* A/B for two die IDs */
79#define LTM2987_ID_B 0x8020
ccf2dc51 80#define LTM4675_ID 0x47a0
00c83371
GR		 81#define LTM4676_ID_REV1 0x4400
82#define LTM4676_ID_REV2 0x4480
15398566 83#define LTM4676A_ID 0x47e0
c3ff9a67 84
fd9175d2 85#define LTC2974_NUM_PAGES 4
3d0d2839
GR		 86#define LTC2978_NUM_PAGES 8
87#define LTC3880_NUM_PAGES 2
fd9175d2 88#define LTC3883_NUM_PAGES 1
3d0d2839 89
e04d1ce9
MJ		 90#define LTC_POLL_TIMEOUT 100 /* in milli-seconds */
91
92#define LTC_NOT_BUSY BIT(5)
93#define LTC_NOT_PENDING BIT(4)
94
c3ff9a67
GR		 95/*
96 * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
97 * happens pretty much each time chip data is updated. Raw peak data therefore
98 * does not provide much value. To be able to provide useful peak data, keep an
99 * internal cache of measured peak data, which is only cleared if an explicit
100 * "clear peak" command is executed for the sensor in question.
101 */
3d0d2839 102
c3ff9a67
GR		 103struct ltc2978_data {
104 enum chips id;
3d0d2839 105 u16 vin_min, vin_max;
fd9175d2 106 u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
3d0d2839 107 u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
fd9175d2 108 u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
649ca820
GR		 109 u16 iin_min, iin_max;
110 u16 pin_min, pin_max;
3d0d2839 111 u16 temp2_max;
c3ff9a67 112 struct pmbus_driver_info info;
8582bcc8 113 u32 features;
c3ff9a67 114};
c3ff9a67
GR		 115#define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info)
116
8582bcc8 117#define FEAT_CLEAR_PEAKS BIT(0)
e04d1ce9 118#define FEAT_NEEDS_POLLING BIT(1)
8582bcc8
GR		 119
120#define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS)
e04d1ce9
MJ		 121#define needs_polling(d) ((d)->features & FEAT_NEEDS_POLLING)
122
123static int ltc_wait_ready(struct i2c_client *client)
124{
125 unsigned long timeout = jiffies + msecs_to_jiffies(LTC_POLL_TIMEOUT);
126 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
127 struct ltc2978_data *data = to_ltc2978_data(info);
128 int status;
129 u8 mask;
130
131 if (!needs_polling(data))
132 return 0;
133
134 /*
135 * LTC3883 does not support LTC_NOT_PENDING, even though
136 * the datasheet claims that it does.
137 */
138 mask = LTC_NOT_BUSY;
139 if (data->id != ltc3883)
140 mask |= LTC_NOT_PENDING;
141
142 do {
143 status = pmbus_read_byte_data(client, 0, LTC2978_MFR_COMMON);
144 if (status == -EBADMSG || status == -ENXIO) {
145 /* PEC error or NACK: chip may be busy, try again */
146 usleep_range(50, 100);
147 continue;
148 }
149 if (status < 0)
150 return status;
151
152 if ((status & mask) == mask)
153 return 0;
154
155 usleep_range(50, 100);
156 } while (time_before(jiffies, timeout));
157
158 return -ETIMEDOUT;
159}
160
161static int ltc_read_word_data(struct i2c_client *client, int page, int reg)
162{
163 int ret;
164
165 ret = ltc_wait_ready(client);
166 if (ret < 0)
167 return ret;
168
169 return pmbus_read_word_data(client, page, reg);
170}
171
172static int ltc_read_byte_data(struct i2c_client *client, int page, int reg)
173{
174 int ret;
175
176 ret = ltc_wait_ready(client);
177 if (ret < 0)
178 return ret;
179
180 return pmbus_read_byte_data(client, page, reg);
181}
182
183static int ltc_write_byte(struct i2c_client *client, int page, u8 byte)
184{
185 int ret;
186
187 ret = ltc_wait_ready(client);
188 if (ret < 0)
189 return ret;
190
191 return pmbus_write_byte(client, page, byte);
192}
8582bcc8 193
c3ff9a67
GR		 194static inline int lin11_to_val(int data)
195{
196 s16 e = ((s16)data) >> 11;
197 s32 m = (((s16)(data << 5)) >> 5);
198
199 /*
200 * mantissa is 10 bit + sign, exponent adds up to 15 bit.
201 * Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31).
202 */
203 e += 6;
204 return (e < 0 ? m >> -e : m << e);
205}
206
ee847a25
GR		 207static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client,
208 int page, int reg, u16 *pmax)
209{
210 int ret;
211
e04d1ce9 212 ret = ltc_read_word_data(client, page, reg);
ee847a25
GR		 213 if (ret >= 0) {
214 if (lin11_to_val(ret) > lin11_to_val(*pmax))
215 *pmax = ret;
216 ret = *pmax;
217 }
218 return ret;
219}
220
221static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client,
222 int page, int reg, u16 *pmin)
223{
224 int ret;
225
e04d1ce9 226 ret = ltc_read_word_data(client, page, reg);
ee847a25
GR		 227 if (ret >= 0) {
228 if (lin11_to_val(ret) < lin11_to_val(*pmin))
229 *pmin = ret;
230 ret = *pmin;
231 }
232 return ret;
233}
234
ddfb41ca
GR		 235static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
236 int reg)
c3ff9a67
GR		 237{
238 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
239 struct ltc2978_data *data = to_ltc2978_data(info);
240 int ret;
241
242 switch (reg) {
243 case PMBUS_VIRT_READ_VIN_MAX:
ee847a25
GR		 244 ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK,
245 &data->vin_max);
c3ff9a67
GR		 246 break;
247 case PMBUS_VIRT_READ_VOUT_MAX:
e04d1ce9 248 ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_PEAK);
c3ff9a67
GR		 249 if (ret >= 0) {
250 /*
251 * VOUT is 16 bit unsigned with fixed exponent,
252 * so we can compare it directly
253 */
254 if (ret > data->vout_max[page])
255 data->vout_max[page] = ret;
256 ret = data->vout_max[page];
257 }
258 break;
259 case PMBUS_VIRT_READ_TEMP_MAX:
ee847a25
GR		 260 ret = ltc_get_max(data, client, page,
261 LTC2978_MFR_TEMPERATURE_PEAK,
262 &data->temp_max[page]);
c3ff9a67 263 break;
ddfb41ca
GR		 264 case PMBUS_VIRT_RESET_VOUT_HISTORY:
265 case PMBUS_VIRT_RESET_VIN_HISTORY:
266 case PMBUS_VIRT_RESET_TEMP_HISTORY:
267 ret = 0;
268 break;
269 default:
e04d1ce9
MJ		 270 ret = ltc_wait_ready(client);
271 if (ret < 0)
272 return ret;
ddfb41ca
GR		 273 ret = -ENODATA;
274 break;
275 }
276 return ret;
277}
278
279static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
280{
281 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
282 struct ltc2978_data *data = to_ltc2978_data(info);
283 int ret;
284
285 switch (reg) {
c3ff9a67 286 case PMBUS_VIRT_READ_VIN_MIN:
ee847a25
GR		 287 ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN,
288 &data->vin_min);
c3ff9a67
GR		 289 break;
290 case PMBUS_VIRT_READ_VOUT_MIN:
e04d1ce9 291 ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_MIN);
c3ff9a67
GR		 292 if (ret >= 0) {
293 /*
294 * VOUT_MIN is known to not be supported on some lots
295 * of LTC2978 revision 1, and will return the maximum
296 * possible voltage if read. If VOUT_MAX is valid and
297 * lower than the reading of VOUT_MIN, use it instead.
298 */
299 if (data->vout_max[page] && ret > data->vout_max[page])
300 ret = data->vout_max[page];
301 if (ret < data->vout_min[page])
302 data->vout_min[page] = ret;
303 ret = data->vout_min[page];
304 }
305 break;
306 case PMBUS_VIRT_READ_TEMP_MIN:
ee847a25
GR		 307 ret = ltc_get_min(data, client, page,
308 LTC2978_MFR_TEMPERATURE_MIN,
309 &data->temp_min[page]);
c3ff9a67 310 break;
ddfb41ca
GR		 311 case PMBUS_VIRT_READ_IOUT_MAX:
312 case PMBUS_VIRT_RESET_IOUT_HISTORY:
313 case PMBUS_VIRT_READ_TEMP2_MAX:
314 case PMBUS_VIRT_RESET_TEMP2_HISTORY:
315 ret = -ENXIO;
316 break;
317 default:
318 ret = ltc2978_read_word_data_common(client, page, reg);
319 break;
320 }
321 return ret;
322}
323
fd9175d2
GR		 324static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
325{
326 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
327 struct ltc2978_data *data = to_ltc2978_data(info);
328 int ret;
329
330 switch (reg) {
331 case PMBUS_VIRT_READ_IOUT_MAX:
ee847a25
GR		 332 ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK,
333 &data->iout_max[page]);
fd9175d2
GR		 334 break;
335 case PMBUS_VIRT_READ_IOUT_MIN:
ee847a25
GR		 336 ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN,
337 &data->iout_min[page]);
fd9175d2
GR		 338 break;
339 case PMBUS_VIRT_RESET_IOUT_HISTORY:
340 ret = 0;
341 break;
342 default:
343 ret = ltc2978_read_word_data(client, page, reg);
344 break;
345 }
346 return ret;
347}
348
649ca820
GR		 349static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg)
350{
351 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
352 struct ltc2978_data *data = to_ltc2978_data(info);
353 int ret;
354
355 switch (reg) {
356 case PMBUS_VIRT_READ_IIN_MAX:
ee847a25
GR		 357 ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK,
358 &data->iin_max);
649ca820
GR		 359 break;
360 case PMBUS_VIRT_READ_IIN_MIN:
ee847a25
GR		 361 ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN,
362 &data->iin_min);
649ca820
GR		 363 break;
364 case PMBUS_VIRT_READ_PIN_MAX:
ee847a25
GR		 365 ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK,
366 &data->pin_max);
649ca820
GR		 367 break;
368 case PMBUS_VIRT_READ_PIN_MIN:
ee847a25
GR		 369 ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN,
370 &data->pin_min);
649ca820
GR		 371 break;
372 case PMBUS_VIRT_RESET_IIN_HISTORY:
373 case PMBUS_VIRT_RESET_PIN_HISTORY:
374 ret = 0;
375 break;
376 default:
377 ret = ltc2978_read_word_data(client, page, reg);
378 break;
379 }
380 return ret;
381}
382
ddfb41ca
GR		 383static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
384{
385 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
386 struct ltc2978_data *data = to_ltc2978_data(info);
387 int ret;
388
389 switch (reg) {
390 case PMBUS_VIRT_READ_IOUT_MAX:
ee847a25
GR		 391 ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK,
392 &data->iout_max[page]);
ddfb41ca
GR		 393 break;
394 case PMBUS_VIRT_READ_TEMP2_MAX:
ee847a25
GR		 395 ret = ltc_get_max(data, client, page,
396 LTC3880_MFR_TEMPERATURE2_PEAK,
397 &data->temp2_max);
ddfb41ca
GR		 398 break;
399 case PMBUS_VIRT_READ_VIN_MIN:
400 case PMBUS_VIRT_READ_VOUT_MIN:
401 case PMBUS_VIRT_READ_TEMP_MIN:
402 ret = -ENXIO;
403 break;
404 case PMBUS_VIRT_RESET_IOUT_HISTORY:
405 case PMBUS_VIRT_RESET_TEMP2_HISTORY:
c3ff9a67
GR		 406 ret = 0;
407 break;
408 default:
ddfb41ca 409 ret = ltc2978_read_word_data_common(client, page, reg);
c3ff9a67
GR		 410 break;
411 }
412 return ret;
413}
414
fd9175d2
GR		 415static int ltc3883_read_word_data(struct i2c_client *client, int page, int reg)
416{
417 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
418 struct ltc2978_data *data = to_ltc2978_data(info);
419 int ret;
420
421 switch (reg) {
422 case PMBUS_VIRT_READ_IIN_MAX:
ee847a25
GR		 423 ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK,
424 &data->iin_max);
fd9175d2
GR		 425 break;
426 case PMBUS_VIRT_RESET_IIN_HISTORY:
427 ret = 0;
428 break;
429 default:
430 ret = ltc3880_read_word_data(client, page, reg);
431 break;
432 }
433 return ret;
434}
435
8582bcc8
GR		 436static int ltc2978_clear_peaks(struct ltc2978_data *data,
437 struct i2c_client *client, int page)
ddfb41ca
GR		 438{
439 int ret;
440
8582bcc8 441 if (has_clear_peaks(data))
e04d1ce9 442 ret = ltc_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
fd9175d2 443 else
e04d1ce9 444 ret = ltc_write_byte(client, page, PMBUS_CLEAR_FAULTS);
ddfb41ca
GR		 445
446 return ret;
447}
448
c3ff9a67
GR		 449static int ltc2978_write_word_data(struct i2c_client *client, int page,
450 int reg, u16 word)
451{
452 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
453 struct ltc2978_data *data = to_ltc2978_data(info);
454 int ret;
455
456 switch (reg) {
fd9175d2
GR		 457 case PMBUS_VIRT_RESET_IIN_HISTORY:
458 data->iin_max = 0x7c00;
649ca820 459 data->iin_min = 0x7bff;
8582bcc8 460 ret = ltc2978_clear_peaks(data, client, 0);
649ca820
GR		 461 break;
462 case PMBUS_VIRT_RESET_PIN_HISTORY:
463 data->pin_max = 0x7c00;
464 data->pin_min = 0x7bff;
8582bcc8 465 ret = ltc2978_clear_peaks(data, client, 0);
fd9175d2 466 break;
ddfb41ca 467 case PMBUS_VIRT_RESET_IOUT_HISTORY:
dbd712c2 468 data->iout_max[page] = 0x7c00;
fd9175d2 469 data->iout_min[page] = 0xfbff;
8582bcc8 470 ret = ltc2978_clear_peaks(data, client, page);
ddfb41ca
GR		 471 break;
472 case PMBUS_VIRT_RESET_TEMP2_HISTORY:
dbd712c2 473 data->temp2_max = 0x7c00;
8582bcc8 474 ret = ltc2978_clear_peaks(data, client, page);
ddfb41ca 475 break;
c3ff9a67
GR		 476 case PMBUS_VIRT_RESET_VOUT_HISTORY:
477 data->vout_min[page] = 0xffff;
478 data->vout_max[page] = 0;
8582bcc8 479 ret = ltc2978_clear_peaks(data, client, page);
c3ff9a67
GR		 480 break;
481 case PMBUS_VIRT_RESET_VIN_HISTORY:
482 data->vin_min = 0x7bff;
dbd712c2 483 data->vin_max = 0x7c00;
8582bcc8 484 ret = ltc2978_clear_peaks(data, client, page);
c3ff9a67
GR		 485 break;
486 case PMBUS_VIRT_RESET_TEMP_HISTORY:
fd9175d2 487 data->temp_min[page] = 0x7bff;
8c958c70 488 data->temp_max[page] = 0x7c00;
8582bcc8 489 ret = ltc2978_clear_peaks(data, client, page);
c3ff9a67
GR		 490 break;
491 default:
e04d1ce9
MJ		 492 ret = ltc_wait_ready(client);
493 if (ret < 0)
494 return ret;
c3ff9a67
GR		 495 ret = -ENODATA;
496 break;
497 }
498 return ret;
499}
500
501static const struct i2c_device_id ltc2978_id[] = {
fd9175d2 502 {"ltc2974", ltc2974},
649ca820 503 {"ltc2975", ltc2975},
c24c407e 504 {"ltc2977", ltc2977},
c3ff9a67 505 {"ltc2978", ltc2978},
52aae6af 506 {"ltc2980", ltc2980},
ddfb41ca 507 {"ltc3880", ltc3880},
bf89386f 508 {"ltc3882", ltc3882},
fd9175d2 509 {"ltc3883", ltc3883},
228b687d 510 {"ltc3886", ltc3886},
15398566 511 {"ltc3887", ltc3887},
52aae6af 512 {"ltm2987", ltm2987},
ccf2dc51 513 {"ltm4675", ltm4675},
f76992b0 514 {"ltm4676", ltm4676},
c3ff9a67
GR		 515 {}
516};
517MODULE_DEVICE_TABLE(i2c, ltc2978_id);
518
77aa3585
AT		 519#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
520static const struct regulator_desc ltc2978_reg_desc[] = {
521 PMBUS_REGULATOR("vout", 0),
522 PMBUS_REGULATOR("vout", 1),
523 PMBUS_REGULATOR("vout", 2),
524 PMBUS_REGULATOR("vout", 3),
525 PMBUS_REGULATOR("vout", 4),
526 PMBUS_REGULATOR("vout", 5),
527 PMBUS_REGULATOR("vout", 6),
528 PMBUS_REGULATOR("vout", 7),
529};
530#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
531
836954da
GR		 532static int ltc2978_get_id(struct i2c_client *client)
533{
534 int chip_id;
535
536 chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
bf89386f
GR		 537 if (chip_id < 0) {
538 const struct i2c_device_id *id;
539 u8 buf[I2C_SMBUS_BLOCK_MAX];
540 int ret;
541
542 if (!i2c_check_functionality(client->adapter,
543 I2C_FUNC_SMBUS_READ_BLOCK_DATA))
544 return -ENODEV;
545
546 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
547 if (ret < 0)
548 return ret;
549 if (ret < 3 || strncmp(buf, "LTC", 3))
550 return -ENODEV;
551
552 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
553 if (ret < 0)
554 return ret;
555 for (id = &ltc2978_id[0]; strlen(id->name); id++) {
556 if (!strncasecmp(id->name, buf, strlen(id->name)))
557 return (int)id->driver_data;
558 }
559 return -ENODEV;
560 }
836954da 561
00c83371
GR		 562 chip_id &= LTC2978_ID_MASK;
563
564 if (chip_id == LTC2974_ID)
836954da 565 return ltc2974;
649ca820
GR		 566 else if (chip_id == LTC2975_ID)
567 return ltc2975;
836954da
GR		 568 else if (chip_id == LTC2977_ID)
569 return ltc2977;
acb092cd 570 else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2)
836954da 571 return ltc2978;
52aae6af
GR		 572 else if (chip_id == LTC2980_ID_A || chip_id == LTC2980_ID_B)
573 return ltc2980;
00c83371 574 else if (chip_id == LTC3880_ID)
836954da 575 return ltc3880;
acb092cd
GR		 576 else if (chip_id == LTC3882_ID || chip_id == LTC3882_ID_D1)
577 return ltc3882;
00c83371 578 else if (chip_id == LTC3883_ID)
836954da 579 return ltc3883;
228b687d
GR		 580 else if (chip_id == LTC3886_ID)
581 return ltc3886;
00c83371 582 else if (chip_id == LTC3887_ID)
15398566 583 return ltc3887;
52aae6af
GR		 584 else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
585 return ltm2987;
ccf2dc51
GR		 586 else if (chip_id == LTM4675_ID)
587 return ltm4675;
00c83371
GR		 588 else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
589 chip_id == LTM4676A_ID)
836954da
GR		 590 return ltm4676;
591
592 dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
593 return -ENODEV;
594}
595
c3ff9a67
GR		 596static int ltc2978_probe(struct i2c_client *client,
597 const struct i2c_device_id *id)
598{
836954da 599 int i, chip_id;
c3ff9a67
GR		 600 struct ltc2978_data *data;
601 struct pmbus_driver_info *info;
602
603 if (!i2c_check_functionality(client->adapter,
604 I2C_FUNC_SMBUS_READ_WORD_DATA))
605 return -ENODEV;
606
8b313ca7
GR		 607 data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data),
608 GFP_KERNEL);
c3ff9a67
GR		 609 if (!data)
610 return -ENOMEM;
611
836954da 612 chip_id = ltc2978_get_id(client);
8b313ca7
GR		 613 if (chip_id < 0)
614 return chip_id;
c3ff9a67 615
836954da 616 data->id = chip_id;
c3ff9a67
GR		 617 if (data->id != id->driver_data)
618 dev_warn(&client->dev,
619 "Device mismatch: Configured %s, detected %s\n",
620 id->name,
621 ltc2978_id[data->id].name);
622
623 info = &data->info;
c3ff9a67 624 info->write_word_data = ltc2978_write_word_data;
e04d1ce9
MJ		 625 info->write_byte = ltc_write_byte;
626 info->read_word_data = ltc_read_word_data;
627 info->read_byte_data = ltc_read_byte_data;
c3ff9a67 628
c3ff9a67 629 data->vin_min = 0x7bff;
dbd712c2 630 data->vin_max = 0x7c00;
3d0d2839
GR		 631 for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
632 data->vout_min[i] = 0xffff;
fd9175d2
GR		 633 for (i = 0; i < ARRAY_SIZE(data->iout_min); i++)
634 data->iout_min[i] = 0xfbff;
635 for (i = 0; i < ARRAY_SIZE(data->iout_max); i++)
636 data->iout_max[i] = 0x7c00;
637 for (i = 0; i < ARRAY_SIZE(data->temp_min); i++)
638 data->temp_min[i] = 0x7bff;
8c958c70
GR		 639 for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
640 data->temp_max[i] = 0x7c00;
dbd712c2 641 data->temp2_max = 0x7c00;
c3ff9a67 642
f366fccd 643 switch (data->id) {
fd9175d2
GR		 644 case ltc2974:
645 info->read_word_data = ltc2974_read_word_data;
646 info->pages = LTC2974_NUM_PAGES;
647 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
648 | PMBUS_HAVE_TEMP2;
649 for (i = 0; i < info->pages; i++) {
650 info->func[i] |= PMBUS_HAVE_VOUT
651 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
652 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
653 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
654 }
655 break;
649ca820
GR		 656 case ltc2975:
657 info->read_word_data = ltc2975_read_word_data;
658 info->pages = LTC2974_NUM_PAGES;
659 info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
660 | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
661 | PMBUS_HAVE_TEMP2;
662 for (i = 0; i < info->pages; i++) {
663 info->func[i] |= PMBUS_HAVE_VOUT
664 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
665 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
666 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
667 }
668 break;
c24c407e 669 case ltc2977:
c3ff9a67 670 case ltc2978:
52aae6af
GR		 671 case ltc2980:
672 case ltm2987:
ddfb41ca 673 info->read_word_data = ltc2978_read_word_data;
3d0d2839 674 info->pages = LTC2978_NUM_PAGES;
c3ff9a67
GR		 675 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
676 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
677 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
3d0d2839 678 for (i = 1; i < LTC2978_NUM_PAGES; i++) {
c3ff9a67
GR		 679 info->func[i] = PMBUS_HAVE_VOUT
680 | PMBUS_HAVE_STATUS_VOUT;
c3ff9a67
GR		 681 }
682 break;
ddfb41ca 683 case ltc3880:
15398566 684 case ltc3887:
ccf2dc51 685 case ltm4675:
f76992b0 686 case ltm4676:
e04d1ce9 687 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
ddfb41ca 688 info->read_word_data = ltc3880_read_word_data;
3d0d2839 689 info->pages = LTC3880_NUM_PAGES;
ddfb41ca
GR		 690 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
691 | PMBUS_HAVE_STATUS_INPUT
692 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
693 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
694 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
695 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
696 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
697 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
698 | PMBUS_HAVE_POUT
699 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
fd9175d2 700 break;
bf89386f 701 case ltc3882:
e04d1ce9 702 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
bf89386f
GR		 703 info->read_word_data = ltc3880_read_word_data;
704 info->pages = LTC3880_NUM_PAGES;
705 info->func[0] = PMBUS_HAVE_VIN
706 | PMBUS_HAVE_STATUS_INPUT
707 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
708 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
709 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
710 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
711 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
712 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
713 | PMBUS_HAVE_POUT
714 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
715 break;
fd9175d2 716 case ltc3883:
e04d1ce9 717 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
fd9175d2
GR		 718 info->read_word_data = ltc3883_read_word_data;
719 info->pages = LTC3883_NUM_PAGES;
720 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
721 | PMBUS_HAVE_STATUS_INPUT
722 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
723 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
724 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
725 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
ddfb41ca 726 break;
228b687d 727 case ltc3886:
e04d1ce9 728 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
228b687d
GR		 729 info->read_word_data = ltc3883_read_word_data;
730 info->pages = LTC3880_NUM_PAGES;
731 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
732 | PMBUS_HAVE_STATUS_INPUT
733 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
734 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
735 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
736 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
737 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
738 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
739 | PMBUS_HAVE_POUT
740 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
741 break;
c3ff9a67 742 default:
8b313ca7 743 return -ENODEV;
c3ff9a67 744 }
77aa3585
AT		 745
746#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
747 info->num_regulators = info->pages;
748 info->reg_desc = ltc2978_reg_desc;
749 if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
750 dev_err(&client->dev, "num_regulators too large!");
751 info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
752 }
753#endif
754
8b313ca7 755 return pmbus_do_probe(client, id, info);
c3ff9a67
GR		 756}
757
77aa3585
AT		 758#ifdef CONFIG_OF
759static const struct of_device_id ltc2978_of_match[] = {
760 { .compatible = "lltc,ltc2974" },
649ca820 761 { .compatible = "lltc,ltc2975" },
77aa3585
AT		 762 { .compatible = "lltc,ltc2977" },
763 { .compatible = "lltc,ltc2978" },
52aae6af 764 { .compatible = "lltc,ltc2980" },
77aa3585 765 { .compatible = "lltc,ltc3880" },
bf89386f 766 { .compatible = "lltc,ltc3882" },
77aa3585 767 { .compatible = "lltc,ltc3883" },
228b687d 768 { .compatible = "lltc,ltc3886" },
15398566 769 { .compatible = "lltc,ltc3887" },
52aae6af 770 { .compatible = "lltc,ltm2987" },
ccf2dc51 771 { .compatible = "lltc,ltm4675" },
77aa3585
AT		 772 { .compatible = "lltc,ltm4676" },
773 { }
774};
775MODULE_DEVICE_TABLE(of, ltc2978_of_match);
776#endif
777
c3ff9a67
GR		 778static struct i2c_driver ltc2978_driver = {
779 .driver = {
780 .name = "ltc2978",
77aa3585 781 .of_match_table = of_match_ptr(ltc2978_of_match),
c3ff9a67
GR		 782 },
783 .probe = ltc2978_probe,
dd285ad7 784 .remove = pmbus_do_remove,
c3ff9a67
GR		 785 .id_table = ltc2978_id,
786};
787
f0967eea 788module_i2c_driver(ltc2978_driver);
c3ff9a67
GR		 789
790MODULE_AUTHOR("Guenter Roeck");
649ca820 791MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips");
c3ff9a67 792MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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