Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c3ff9a67 | 2 | /* |
649ca820 | 3 | * Hardware monitoring driver for LTC2978 and compatible chips. |
c3ff9a67 GR |
4 | * |
5 | * Copyright (c) 2011 Ericsson AB. | |
649ca820 | 6 | * Copyright (c) 2013, 2014, 2015 Guenter Roeck |
e04d1ce9 | 7 | * Copyright (c) 2015 Linear Technology |
4e15d05d | 8 | * Copyright (c) 2018 Analog Devices Inc. |
c3ff9a67 GR |
9 | */ |
10 | ||
e04d1ce9 MJ |
11 | #include <linux/delay.h> |
12 | #include <linux/jiffies.h> | |
c3ff9a67 GR |
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> | |
77aa3585 | 19 | #include <linux/regulator/driver.h> |
c3ff9a67 GR |
20 | #include "pmbus.h" |
21 | ||
52aae6af | 22 | enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882, |
4e15d05d | 23 | ltc3883, ltc3886, ltc3887, ltm2987, ltm4675, ltm4676, ltm4686 }; |
c3ff9a67 | 24 | |
fd9175d2 | 25 | /* Common for all chips */ |
c3ff9a67 GR |
26 | #define LTC2978_MFR_VOUT_PEAK 0xdd |
27 | #define LTC2978_MFR_VIN_PEAK 0xde | |
28 | #define LTC2978_MFR_TEMPERATURE_PEAK 0xdf | |
acb092cd | 29 | #define LTC2978_MFR_SPECIAL_ID 0xe7 /* Undocumented on LTC3882 */ |
e04d1ce9 | 30 | #define LTC2978_MFR_COMMON 0xef |
c3ff9a67 | 31 | |
52aae6af | 32 | /* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */ |
c3ff9a67 GR |
33 | #define LTC2978_MFR_VOUT_MIN 0xfb |
34 | #define LTC2978_MFR_VIN_MIN 0xfc | |
35 | #define LTC2978_MFR_TEMPERATURE_MIN 0xfd | |
36 | ||
649ca820 | 37 | /* LTC2974, LTC2975 */ |
fd9175d2 GR |
38 | #define LTC2974_MFR_IOUT_PEAK 0xd7 |
39 | #define LTC2974_MFR_IOUT_MIN 0xd8 | |
40 | ||
ccf2dc51 | 41 | /* LTC3880, LTC3882, LTC3883, LTC3887, LTM4675, and LTM4676 */ |
ddfb41ca GR |
42 | #define LTC3880_MFR_IOUT_PEAK 0xd7 |
43 | #define LTC3880_MFR_CLEAR_PEAKS 0xe3 | |
44 | #define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4 | |
45 | ||
228b687d | 46 | /* LTC3883 and LTC3886 only */ |
fd9175d2 GR |
47 | #define LTC3883_MFR_IIN_PEAK 0xe1 |
48 | ||
649ca820 GR |
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 | ||
00c83371 GR |
55 | #define LTC2978_ID_MASK 0xfff0 |
56 | ||
57 | #define LTC2974_ID 0x0210 | |
58 | #define LTC2975_ID 0x0220 | |
c24c407e | 59 | #define LTC2977_ID 0x0130 |
acb092cd GR |
60 | #define LTC2978_ID_REV1 0x0110 /* Early revision */ |
61 | #define LTC2978_ID_REV2 0x0120 | |
52aae6af GR |
62 | #define LTC2980_ID_A 0x8030 /* A/B for two die IDs */ |
63 | #define LTC2980_ID_B 0x8040 | |
00c83371 | 64 | #define LTC3880_ID 0x4020 |
acb092cd GR |
65 | #define LTC3882_ID 0x4200 |
66 | #define LTC3882_ID_D1 0x4240 /* Dash 1 */ | |
fd9175d2 | 67 | #define LTC3883_ID 0x4300 |
228b687d | 68 | #define LTC3886_ID 0x4600 |
15398566 | 69 | #define LTC3887_ID 0x4700 |
52aae6af GR |
70 | #define LTM2987_ID_A 0x8010 /* A/B for two die IDs */ |
71 | #define LTM2987_ID_B 0x8020 | |
ccf2dc51 | 72 | #define LTM4675_ID 0x47a0 |
00c83371 GR |
73 | #define LTM4676_ID_REV1 0x4400 |
74 | #define LTM4676_ID_REV2 0x4480 | |
15398566 | 75 | #define LTM4676A_ID 0x47e0 |
4e15d05d | 76 | #define LTM4686_ID 0x4770 |
c3ff9a67 | 77 | |
fd9175d2 | 78 | #define LTC2974_NUM_PAGES 4 |
3d0d2839 GR |
79 | #define LTC2978_NUM_PAGES 8 |
80 | #define LTC3880_NUM_PAGES 2 | |
fd9175d2 | 81 | #define LTC3883_NUM_PAGES 1 |
3d0d2839 | 82 | |
e04d1ce9 MJ |
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 | ||
c3ff9a67 GR |
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 | */ | |
3d0d2839 | 95 | |
c3ff9a67 GR |
96 | struct ltc2978_data { |
97 | enum chips id; | |
3d0d2839 | 98 | u16 vin_min, vin_max; |
fd9175d2 | 99 | u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES]; |
3d0d2839 | 100 | u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES]; |
fd9175d2 | 101 | u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES]; |
649ca820 GR |
102 | u16 iin_min, iin_max; |
103 | u16 pin_min, pin_max; | |
3d0d2839 | 104 | u16 temp2_max; |
c3ff9a67 | 105 | struct pmbus_driver_info info; |
8582bcc8 | 106 | u32 features; |
c3ff9a67 | 107 | }; |
c3ff9a67 GR |
108 | #define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info) |
109 | ||
8582bcc8 | 110 | #define FEAT_CLEAR_PEAKS BIT(0) |
e04d1ce9 | 111 | #define FEAT_NEEDS_POLLING BIT(1) |
8582bcc8 GR |
112 | |
113 | #define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS) | |
e04d1ce9 MJ |
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 | } | |
8582bcc8 | 186 | |
c3ff9a67 GR |
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 | ||
ee847a25 GR |
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 | ||
e04d1ce9 | 205 | ret = ltc_read_word_data(client, page, reg); |
ee847a25 GR |
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 | ||
e04d1ce9 | 219 | ret = ltc_read_word_data(client, page, reg); |
ee847a25 GR |
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 | ||
ddfb41ca GR |
228 | static int ltc2978_read_word_data_common(struct i2c_client *client, int page, |
229 | int reg) | |
c3ff9a67 GR |
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: | |
ee847a25 GR |
237 | ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK, |
238 | &data->vin_max); | |
c3ff9a67 GR |
239 | break; |
240 | case PMBUS_VIRT_READ_VOUT_MAX: | |
e04d1ce9 | 241 | ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_PEAK); |
c3ff9a67 GR |
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: | |
ee847a25 GR |
253 | ret = ltc_get_max(data, client, page, |
254 | LTC2978_MFR_TEMPERATURE_PEAK, | |
255 | &data->temp_max[page]); | |
c3ff9a67 | 256 | break; |
ddfb41ca GR |
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: | |
e04d1ce9 MJ |
263 | ret = ltc_wait_ready(client); |
264 | if (ret < 0) | |
265 | return ret; | |
ddfb41ca GR |
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) { | |
c3ff9a67 | 279 | case PMBUS_VIRT_READ_VIN_MIN: |
ee847a25 GR |
280 | ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN, |
281 | &data->vin_min); | |
c3ff9a67 GR |
282 | break; |
283 | case PMBUS_VIRT_READ_VOUT_MIN: | |
e04d1ce9 | 284 | ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_MIN); |
c3ff9a67 GR |
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: | |
ee847a25 GR |
300 | ret = ltc_get_min(data, client, page, |
301 | LTC2978_MFR_TEMPERATURE_MIN, | |
302 | &data->temp_min[page]); | |
c3ff9a67 | 303 | break; |
ddfb41ca GR |
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 | ||
fd9175d2 GR |
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: | |
ee847a25 GR |
325 | ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK, |
326 | &data->iout_max[page]); | |
fd9175d2 GR |
327 | break; |
328 | case PMBUS_VIRT_READ_IOUT_MIN: | |
ee847a25 GR |
329 | ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN, |
330 | &data->iout_min[page]); | |
fd9175d2 GR |
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 | ||
649ca820 GR |
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: | |
ee847a25 GR |
350 | ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK, |
351 | &data->iin_max); | |
649ca820 GR |
352 | break; |
353 | case PMBUS_VIRT_READ_IIN_MIN: | |
ee847a25 GR |
354 | ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN, |
355 | &data->iin_min); | |
649ca820 GR |
356 | break; |
357 | case PMBUS_VIRT_READ_PIN_MAX: | |
ee847a25 GR |
358 | ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK, |
359 | &data->pin_max); | |
649ca820 GR |
360 | break; |
361 | case PMBUS_VIRT_READ_PIN_MIN: | |
ee847a25 GR |
362 | ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN, |
363 | &data->pin_min); | |
649ca820 GR |
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 | ||
ddfb41ca GR |
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: | |
ee847a25 GR |
384 | ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK, |
385 | &data->iout_max[page]); | |
ddfb41ca GR |
386 | break; |
387 | case PMBUS_VIRT_READ_TEMP2_MAX: | |
ee847a25 GR |
388 | ret = ltc_get_max(data, client, page, |
389 | LTC3880_MFR_TEMPERATURE2_PEAK, | |
390 | &data->temp2_max); | |
ddfb41ca GR |
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: | |
c3ff9a67 GR |
399 | ret = 0; |
400 | break; | |
401 | default: | |
ddfb41ca | 402 | ret = ltc2978_read_word_data_common(client, page, reg); |
c3ff9a67 GR |
403 | break; |
404 | } | |
405 | return ret; | |
406 | } | |
407 | ||
fd9175d2 GR |
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: | |
ee847a25 GR |
416 | ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK, |
417 | &data->iin_max); | |
fd9175d2 GR |
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 | ||
8582bcc8 GR |
429 | static int ltc2978_clear_peaks(struct ltc2978_data *data, |
430 | struct i2c_client *client, int page) | |
ddfb41ca GR |
431 | { |
432 | int ret; | |
433 | ||
8582bcc8 | 434 | if (has_clear_peaks(data)) |
e04d1ce9 | 435 | ret = ltc_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS); |
fd9175d2 | 436 | else |
e04d1ce9 | 437 | ret = ltc_write_byte(client, page, PMBUS_CLEAR_FAULTS); |
ddfb41ca GR |
438 | |
439 | return ret; | |
440 | } | |
441 | ||
c3ff9a67 GR |
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) { | |
fd9175d2 GR |
450 | case PMBUS_VIRT_RESET_IIN_HISTORY: |
451 | data->iin_max = 0x7c00; | |
649ca820 | 452 | data->iin_min = 0x7bff; |
8582bcc8 | 453 | ret = ltc2978_clear_peaks(data, client, 0); |
649ca820 GR |
454 | break; |
455 | case PMBUS_VIRT_RESET_PIN_HISTORY: | |
456 | data->pin_max = 0x7c00; | |
457 | data->pin_min = 0x7bff; | |
8582bcc8 | 458 | ret = ltc2978_clear_peaks(data, client, 0); |
fd9175d2 | 459 | break; |
ddfb41ca | 460 | case PMBUS_VIRT_RESET_IOUT_HISTORY: |
dbd712c2 | 461 | data->iout_max[page] = 0x7c00; |
fd9175d2 | 462 | data->iout_min[page] = 0xfbff; |
8582bcc8 | 463 | ret = ltc2978_clear_peaks(data, client, page); |
ddfb41ca GR |
464 | break; |
465 | case PMBUS_VIRT_RESET_TEMP2_HISTORY: | |
dbd712c2 | 466 | data->temp2_max = 0x7c00; |
8582bcc8 | 467 | ret = ltc2978_clear_peaks(data, client, page); |
ddfb41ca | 468 | break; |
c3ff9a67 GR |
469 | case PMBUS_VIRT_RESET_VOUT_HISTORY: |
470 | data->vout_min[page] = 0xffff; | |
471 | data->vout_max[page] = 0; | |
8582bcc8 | 472 | ret = ltc2978_clear_peaks(data, client, page); |
c3ff9a67 GR |
473 | break; |
474 | case PMBUS_VIRT_RESET_VIN_HISTORY: | |
475 | data->vin_min = 0x7bff; | |
dbd712c2 | 476 | data->vin_max = 0x7c00; |
8582bcc8 | 477 | ret = ltc2978_clear_peaks(data, client, page); |
c3ff9a67 GR |
478 | break; |
479 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
fd9175d2 | 480 | data->temp_min[page] = 0x7bff; |
8c958c70 | 481 | data->temp_max[page] = 0x7c00; |
8582bcc8 | 482 | ret = ltc2978_clear_peaks(data, client, page); |
c3ff9a67 GR |
483 | break; |
484 | default: | |
e04d1ce9 MJ |
485 | ret = ltc_wait_ready(client); |
486 | if (ret < 0) | |
487 | return ret; | |
c3ff9a67 GR |
488 | ret = -ENODATA; |
489 | break; | |
490 | } | |
491 | return ret; | |
492 | } | |
493 | ||
494 | static const struct i2c_device_id ltc2978_id[] = { | |
fd9175d2 | 495 | {"ltc2974", ltc2974}, |
649ca820 | 496 | {"ltc2975", ltc2975}, |
c24c407e | 497 | {"ltc2977", ltc2977}, |
c3ff9a67 | 498 | {"ltc2978", ltc2978}, |
52aae6af | 499 | {"ltc2980", ltc2980}, |
ddfb41ca | 500 | {"ltc3880", ltc3880}, |
bf89386f | 501 | {"ltc3882", ltc3882}, |
fd9175d2 | 502 | {"ltc3883", ltc3883}, |
228b687d | 503 | {"ltc3886", ltc3886}, |
15398566 | 504 | {"ltc3887", ltc3887}, |
52aae6af | 505 | {"ltm2987", ltm2987}, |
ccf2dc51 | 506 | {"ltm4675", ltm4675}, |
f76992b0 | 507 | {"ltm4676", ltm4676}, |
4e15d05d | 508 | {"ltm4686", ltm4686}, |
c3ff9a67 GR |
509 | {} |
510 | }; | |
511 | MODULE_DEVICE_TABLE(i2c, ltc2978_id); | |
512 | ||
77aa3585 AT |
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 | ||
836954da GR |
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); | |
bf89386f GR |
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 = <c2978_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 | } | |
836954da | 555 | |
00c83371 GR |
556 | chip_id &= LTC2978_ID_MASK; |
557 | ||
558 | if (chip_id == LTC2974_ID) | |
836954da | 559 | return ltc2974; |
649ca820 GR |
560 | else if (chip_id == LTC2975_ID) |
561 | return ltc2975; | |
836954da GR |
562 | else if (chip_id == LTC2977_ID) |
563 | return ltc2977; | |
acb092cd | 564 | else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) |
836954da | 565 | return ltc2978; |
52aae6af GR |
566 | else if (chip_id == LTC2980_ID_A || chip_id == LTC2980_ID_B) |
567 | return ltc2980; | |
00c83371 | 568 | else if (chip_id == LTC3880_ID) |
836954da | 569 | return ltc3880; |
acb092cd GR |
570 | else if (chip_id == LTC3882_ID || chip_id == LTC3882_ID_D1) |
571 | return ltc3882; | |
00c83371 | 572 | else if (chip_id == LTC3883_ID) |
836954da | 573 | return ltc3883; |
228b687d GR |
574 | else if (chip_id == LTC3886_ID) |
575 | return ltc3886; | |
00c83371 | 576 | else if (chip_id == LTC3887_ID) |
15398566 | 577 | return ltc3887; |
52aae6af GR |
578 | else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B) |
579 | return ltm2987; | |
ccf2dc51 GR |
580 | else if (chip_id == LTM4675_ID) |
581 | return ltm4675; | |
00c83371 GR |
582 | else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 || |
583 | chip_id == LTM4676A_ID) | |
836954da | 584 | return ltm4676; |
4e15d05d MH |
585 | else if (chip_id == LTM4686_ID) |
586 | return ltm4686; | |
836954da GR |
587 | |
588 | dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id); | |
589 | return -ENODEV; | |
590 | } | |
591 | ||
c3ff9a67 GR |
592 | static int ltc2978_probe(struct i2c_client *client, |
593 | const struct i2c_device_id *id) | |
594 | { | |
836954da | 595 | int i, chip_id; |
c3ff9a67 GR |
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 | ||
8b313ca7 GR |
603 | data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data), |
604 | GFP_KERNEL); | |
c3ff9a67 GR |
605 | if (!data) |
606 | return -ENOMEM; | |
607 | ||
836954da | 608 | chip_id = ltc2978_get_id(client); |
8b313ca7 GR |
609 | if (chip_id < 0) |
610 | return chip_id; | |
c3ff9a67 | 611 | |
836954da | 612 | data->id = chip_id; |
c3ff9a67 GR |
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; | |
c3ff9a67 | 620 | info->write_word_data = ltc2978_write_word_data; |
e04d1ce9 MJ |
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; | |
c3ff9a67 | 624 | |
c3ff9a67 | 625 | data->vin_min = 0x7bff; |
dbd712c2 | 626 | data->vin_max = 0x7c00; |
3d0d2839 GR |
627 | for (i = 0; i < ARRAY_SIZE(data->vout_min); i++) |
628 | data->vout_min[i] = 0xffff; | |
fd9175d2 GR |
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; | |
8c958c70 GR |
635 | for (i = 0; i < ARRAY_SIZE(data->temp_max); i++) |
636 | data->temp_max[i] = 0x7c00; | |
dbd712c2 | 637 | data->temp2_max = 0x7c00; |
c3ff9a67 | 638 | |
f366fccd | 639 | switch (data->id) { |
fd9175d2 GR |
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; | |
649ca820 GR |
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; | |
c24c407e | 665 | case ltc2977: |
c3ff9a67 | 666 | case ltc2978: |
52aae6af GR |
667 | case ltc2980: |
668 | case ltm2987: | |
ddfb41ca | 669 | info->read_word_data = ltc2978_read_word_data; |
3d0d2839 | 670 | info->pages = LTC2978_NUM_PAGES; |
c3ff9a67 GR |
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; | |
3d0d2839 | 674 | for (i = 1; i < LTC2978_NUM_PAGES; i++) { |
c3ff9a67 GR |
675 | info->func[i] = PMBUS_HAVE_VOUT |
676 | | PMBUS_HAVE_STATUS_VOUT; | |
c3ff9a67 GR |
677 | } |
678 | break; | |
ddfb41ca | 679 | case ltc3880: |
15398566 | 680 | case ltc3887: |
ccf2dc51 | 681 | case ltm4675: |
f76992b0 | 682 | case ltm4676: |
4e15d05d | 683 | case ltm4686: |
e04d1ce9 | 684 | data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; |
ddfb41ca | 685 | info->read_word_data = ltc3880_read_word_data; |
3d0d2839 | 686 | info->pages = LTC3880_NUM_PAGES; |
ddfb41ca GR |
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; | |
fd9175d2 | 697 | break; |
bf89386f | 698 | case ltc3882: |
e04d1ce9 | 699 | data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; |
bf89386f GR |
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; | |
fd9175d2 | 713 | case ltc3883: |
e04d1ce9 | 714 | data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; |
fd9175d2 GR |
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; | |
ddfb41ca | 723 | break; |
228b687d | 724 | case ltc3886: |
e04d1ce9 | 725 | data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; |
228b687d GR |
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; | |
c3ff9a67 | 739 | default: |
8b313ca7 | 740 | return -ENODEV; |
c3ff9a67 | 741 | } |
77aa3585 AT |
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 | ||
8b313ca7 | 752 | return pmbus_do_probe(client, id, info); |
c3ff9a67 GR |
753 | } |
754 | ||
77aa3585 AT |
755 | #ifdef CONFIG_OF |
756 | static const struct of_device_id ltc2978_of_match[] = { | |
757 | { .compatible = "lltc,ltc2974" }, | |
649ca820 | 758 | { .compatible = "lltc,ltc2975" }, |
77aa3585 AT |
759 | { .compatible = "lltc,ltc2977" }, |
760 | { .compatible = "lltc,ltc2978" }, | |
52aae6af | 761 | { .compatible = "lltc,ltc2980" }, |
77aa3585 | 762 | { .compatible = "lltc,ltc3880" }, |
bf89386f | 763 | { .compatible = "lltc,ltc3882" }, |
77aa3585 | 764 | { .compatible = "lltc,ltc3883" }, |
228b687d | 765 | { .compatible = "lltc,ltc3886" }, |
15398566 | 766 | { .compatible = "lltc,ltc3887" }, |
52aae6af | 767 | { .compatible = "lltc,ltm2987" }, |
ccf2dc51 | 768 | { .compatible = "lltc,ltm4675" }, |
77aa3585 | 769 | { .compatible = "lltc,ltm4676" }, |
4e15d05d | 770 | { .compatible = "lltc,ltm4686" }, |
77aa3585 AT |
771 | { } |
772 | }; | |
773 | MODULE_DEVICE_TABLE(of, ltc2978_of_match); | |
774 | #endif | |
775 | ||
c3ff9a67 GR |
776 | static struct i2c_driver ltc2978_driver = { |
777 | .driver = { | |
778 | .name = "ltc2978", | |
77aa3585 | 779 | .of_match_table = of_match_ptr(ltc2978_of_match), |
c3ff9a67 GR |
780 | }, |
781 | .probe = ltc2978_probe, | |
dd285ad7 | 782 | .remove = pmbus_do_remove, |
c3ff9a67 GR |
783 | .id_table = ltc2978_id, |
784 | }; | |
785 | ||
f0967eea | 786 | module_i2c_driver(ltc2978_driver); |
c3ff9a67 GR |
787 | |
788 | MODULE_AUTHOR("Guenter Roeck"); | |
89688e8d | 789 | MODULE_DESCRIPTION("PMBus driver for LTC2978 and compatible chips"); |
c3ff9a67 | 790 | MODULE_LICENSE("GPL"); |