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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 |
c3ff9a67 GR |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
c3ff9a67 GR |
16 | */ |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/i2c.h> | |
77aa3585 | 24 | #include <linux/regulator/driver.h> |
c3ff9a67 GR |
25 | #include "pmbus.h" |
26 | ||
649ca820 GR |
27 | enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, |
28 | ltc3887, ltm4676 }; | |
c3ff9a67 | 29 | |
fd9175d2 | 30 | /* Common for all chips */ |
c3ff9a67 GR |
31 | #define LTC2978_MFR_VOUT_PEAK 0xdd |
32 | #define LTC2978_MFR_VIN_PEAK 0xde | |
33 | #define LTC2978_MFR_TEMPERATURE_PEAK 0xdf | |
bf89386f | 34 | #define LTC2978_MFR_SPECIAL_ID 0xe7 /* Not on LTC3882 */ |
c3ff9a67 | 35 | |
649ca820 | 36 | /* LTC2974, LTC2975, LCT2977, and LTC2978 */ |
c3ff9a67 GR |
37 | #define LTC2978_MFR_VOUT_MIN 0xfb |
38 | #define LTC2978_MFR_VIN_MIN 0xfc | |
39 | #define LTC2978_MFR_TEMPERATURE_MIN 0xfd | |
40 | ||
649ca820 | 41 | /* LTC2974, LTC2975 */ |
fd9175d2 GR |
42 | #define LTC2974_MFR_IOUT_PEAK 0xd7 |
43 | #define LTC2974_MFR_IOUT_MIN 0xd8 | |
44 | ||
15398566 | 45 | /* LTC3880, LTC3882, LTC3883, LTC3887, and LTM4676 */ |
ddfb41ca GR |
46 | #define LTC3880_MFR_IOUT_PEAK 0xd7 |
47 | #define LTC3880_MFR_CLEAR_PEAKS 0xe3 | |
48 | #define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4 | |
49 | ||
fd9175d2 GR |
50 | /* LTC3883 only */ |
51 | #define LTC3883_MFR_IIN_PEAK 0xe1 | |
52 | ||
649ca820 GR |
53 | /* LTC2975 only */ |
54 | #define LTC2975_MFR_IIN_PEAK 0xc4 | |
55 | #define LTC2975_MFR_IIN_MIN 0xc5 | |
56 | #define LTC2975_MFR_PIN_PEAK 0xc6 | |
57 | #define LTC2975_MFR_PIN_MIN 0xc7 | |
58 | ||
a2e15107 GR |
59 | #define LTC2974_ID_REV1 0x0212 |
60 | #define LTC2974_ID_REV2 0x0213 | |
649ca820 | 61 | #define LTC2975_ID 0x0223 |
c24c407e | 62 | #define LTC2977_ID 0x0130 |
c3ff9a67 GR |
63 | #define LTC2978_ID_REV1 0x0121 |
64 | #define LTC2978_ID_REV2 0x0122 | |
3f08d7f4 | 65 | #define LTC2978A_ID 0x0124 |
ddfb41ca GR |
66 | #define LTC3880_ID 0x4000 |
67 | #define LTC3880_ID_MASK 0xff00 | |
fd9175d2 GR |
68 | #define LTC3883_ID 0x4300 |
69 | #define LTC3883_ID_MASK 0xff00 | |
15398566 GR |
70 | #define LTC3887_ID 0x4700 |
71 | #define LTC3887_ID_MASK 0xff00 | |
e8047a26 GR |
72 | #define LTM4676_ID 0x4400 |
73 | #define LTM4676_ID_2 0x4480 | |
15398566 | 74 | #define LTM4676A_ID 0x47e0 |
f76992b0 | 75 | #define LTM4676_ID_MASK 0xfff0 |
c3ff9a67 | 76 | |
fd9175d2 | 77 | #define LTC2974_NUM_PAGES 4 |
3d0d2839 GR |
78 | #define LTC2978_NUM_PAGES 8 |
79 | #define LTC3880_NUM_PAGES 2 | |
fd9175d2 | 80 | #define LTC3883_NUM_PAGES 1 |
3d0d2839 | 81 | |
c3ff9a67 GR |
82 | /* |
83 | * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which | |
84 | * happens pretty much each time chip data is updated. Raw peak data therefore | |
85 | * does not provide much value. To be able to provide useful peak data, keep an | |
86 | * internal cache of measured peak data, which is only cleared if an explicit | |
87 | * "clear peak" command is executed for the sensor in question. | |
88 | */ | |
3d0d2839 | 89 | |
c3ff9a67 GR |
90 | struct ltc2978_data { |
91 | enum chips id; | |
3d0d2839 | 92 | u16 vin_min, vin_max; |
fd9175d2 | 93 | u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES]; |
3d0d2839 | 94 | u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES]; |
fd9175d2 | 95 | u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES]; |
649ca820 GR |
96 | u16 iin_min, iin_max; |
97 | u16 pin_min, pin_max; | |
3d0d2839 | 98 | u16 temp2_max; |
c3ff9a67 | 99 | struct pmbus_driver_info info; |
8582bcc8 | 100 | u32 features; |
c3ff9a67 | 101 | }; |
c3ff9a67 GR |
102 | #define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info) |
103 | ||
8582bcc8 GR |
104 | #define FEAT_CLEAR_PEAKS BIT(0) |
105 | ||
106 | #define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS) | |
107 | ||
c3ff9a67 GR |
108 | static inline int lin11_to_val(int data) |
109 | { | |
110 | s16 e = ((s16)data) >> 11; | |
111 | s32 m = (((s16)(data << 5)) >> 5); | |
112 | ||
113 | /* | |
114 | * mantissa is 10 bit + sign, exponent adds up to 15 bit. | |
115 | * Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31). | |
116 | */ | |
117 | e += 6; | |
118 | return (e < 0 ? m >> -e : m << e); | |
119 | } | |
120 | ||
ee847a25 GR |
121 | static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client, |
122 | int page, int reg, u16 *pmax) | |
123 | { | |
124 | int ret; | |
125 | ||
126 | ret = pmbus_read_word_data(client, page, reg); | |
127 | if (ret >= 0) { | |
128 | if (lin11_to_val(ret) > lin11_to_val(*pmax)) | |
129 | *pmax = ret; | |
130 | ret = *pmax; | |
131 | } | |
132 | return ret; | |
133 | } | |
134 | ||
135 | static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client, | |
136 | int page, int reg, u16 *pmin) | |
137 | { | |
138 | int ret; | |
139 | ||
140 | ret = pmbus_read_word_data(client, page, reg); | |
141 | if (ret >= 0) { | |
142 | if (lin11_to_val(ret) < lin11_to_val(*pmin)) | |
143 | *pmin = ret; | |
144 | ret = *pmin; | |
145 | } | |
146 | return ret; | |
147 | } | |
148 | ||
ddfb41ca GR |
149 | static int ltc2978_read_word_data_common(struct i2c_client *client, int page, |
150 | int reg) | |
c3ff9a67 GR |
151 | { |
152 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
153 | struct ltc2978_data *data = to_ltc2978_data(info); | |
154 | int ret; | |
155 | ||
156 | switch (reg) { | |
157 | case PMBUS_VIRT_READ_VIN_MAX: | |
ee847a25 GR |
158 | ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK, |
159 | &data->vin_max); | |
c3ff9a67 GR |
160 | break; |
161 | case PMBUS_VIRT_READ_VOUT_MAX: | |
162 | ret = pmbus_read_word_data(client, page, LTC2978_MFR_VOUT_PEAK); | |
163 | if (ret >= 0) { | |
164 | /* | |
165 | * VOUT is 16 bit unsigned with fixed exponent, | |
166 | * so we can compare it directly | |
167 | */ | |
168 | if (ret > data->vout_max[page]) | |
169 | data->vout_max[page] = ret; | |
170 | ret = data->vout_max[page]; | |
171 | } | |
172 | break; | |
173 | case PMBUS_VIRT_READ_TEMP_MAX: | |
ee847a25 GR |
174 | ret = ltc_get_max(data, client, page, |
175 | LTC2978_MFR_TEMPERATURE_PEAK, | |
176 | &data->temp_max[page]); | |
c3ff9a67 | 177 | break; |
ddfb41ca GR |
178 | case PMBUS_VIRT_RESET_VOUT_HISTORY: |
179 | case PMBUS_VIRT_RESET_VIN_HISTORY: | |
180 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
181 | ret = 0; | |
182 | break; | |
183 | default: | |
184 | ret = -ENODATA; | |
185 | break; | |
186 | } | |
187 | return ret; | |
188 | } | |
189 | ||
190 | static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg) | |
191 | { | |
192 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
193 | struct ltc2978_data *data = to_ltc2978_data(info); | |
194 | int ret; | |
195 | ||
196 | switch (reg) { | |
c3ff9a67 | 197 | case PMBUS_VIRT_READ_VIN_MIN: |
ee847a25 GR |
198 | ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN, |
199 | &data->vin_min); | |
c3ff9a67 GR |
200 | break; |
201 | case PMBUS_VIRT_READ_VOUT_MIN: | |
202 | ret = pmbus_read_word_data(client, page, LTC2978_MFR_VOUT_MIN); | |
203 | if (ret >= 0) { | |
204 | /* | |
205 | * VOUT_MIN is known to not be supported on some lots | |
206 | * of LTC2978 revision 1, and will return the maximum | |
207 | * possible voltage if read. If VOUT_MAX is valid and | |
208 | * lower than the reading of VOUT_MIN, use it instead. | |
209 | */ | |
210 | if (data->vout_max[page] && ret > data->vout_max[page]) | |
211 | ret = data->vout_max[page]; | |
212 | if (ret < data->vout_min[page]) | |
213 | data->vout_min[page] = ret; | |
214 | ret = data->vout_min[page]; | |
215 | } | |
216 | break; | |
217 | case PMBUS_VIRT_READ_TEMP_MIN: | |
ee847a25 GR |
218 | ret = ltc_get_min(data, client, page, |
219 | LTC2978_MFR_TEMPERATURE_MIN, | |
220 | &data->temp_min[page]); | |
c3ff9a67 | 221 | break; |
ddfb41ca GR |
222 | case PMBUS_VIRT_READ_IOUT_MAX: |
223 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
224 | case PMBUS_VIRT_READ_TEMP2_MAX: | |
225 | case PMBUS_VIRT_RESET_TEMP2_HISTORY: | |
226 | ret = -ENXIO; | |
227 | break; | |
228 | default: | |
229 | ret = ltc2978_read_word_data_common(client, page, reg); | |
230 | break; | |
231 | } | |
232 | return ret; | |
233 | } | |
234 | ||
fd9175d2 GR |
235 | static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg) |
236 | { | |
237 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
238 | struct ltc2978_data *data = to_ltc2978_data(info); | |
239 | int ret; | |
240 | ||
241 | switch (reg) { | |
242 | case PMBUS_VIRT_READ_IOUT_MAX: | |
ee847a25 GR |
243 | ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK, |
244 | &data->iout_max[page]); | |
fd9175d2 GR |
245 | break; |
246 | case PMBUS_VIRT_READ_IOUT_MIN: | |
ee847a25 GR |
247 | ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN, |
248 | &data->iout_min[page]); | |
fd9175d2 GR |
249 | break; |
250 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
251 | ret = 0; | |
252 | break; | |
253 | default: | |
254 | ret = ltc2978_read_word_data(client, page, reg); | |
255 | break; | |
256 | } | |
257 | return ret; | |
258 | } | |
259 | ||
649ca820 GR |
260 | static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg) |
261 | { | |
262 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
263 | struct ltc2978_data *data = to_ltc2978_data(info); | |
264 | int ret; | |
265 | ||
266 | switch (reg) { | |
267 | case PMBUS_VIRT_READ_IIN_MAX: | |
ee847a25 GR |
268 | ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK, |
269 | &data->iin_max); | |
649ca820 GR |
270 | break; |
271 | case PMBUS_VIRT_READ_IIN_MIN: | |
ee847a25 GR |
272 | ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN, |
273 | &data->iin_min); | |
649ca820 GR |
274 | break; |
275 | case PMBUS_VIRT_READ_PIN_MAX: | |
ee847a25 GR |
276 | ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK, |
277 | &data->pin_max); | |
649ca820 GR |
278 | break; |
279 | case PMBUS_VIRT_READ_PIN_MIN: | |
ee847a25 GR |
280 | ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN, |
281 | &data->pin_min); | |
649ca820 GR |
282 | break; |
283 | case PMBUS_VIRT_RESET_IIN_HISTORY: | |
284 | case PMBUS_VIRT_RESET_PIN_HISTORY: | |
285 | ret = 0; | |
286 | break; | |
287 | default: | |
288 | ret = ltc2978_read_word_data(client, page, reg); | |
289 | break; | |
290 | } | |
291 | return ret; | |
292 | } | |
293 | ||
ddfb41ca GR |
294 | static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg) |
295 | { | |
296 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
297 | struct ltc2978_data *data = to_ltc2978_data(info); | |
298 | int ret; | |
299 | ||
300 | switch (reg) { | |
301 | case PMBUS_VIRT_READ_IOUT_MAX: | |
ee847a25 GR |
302 | ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK, |
303 | &data->iout_max[page]); | |
ddfb41ca GR |
304 | break; |
305 | case PMBUS_VIRT_READ_TEMP2_MAX: | |
ee847a25 GR |
306 | ret = ltc_get_max(data, client, page, |
307 | LTC3880_MFR_TEMPERATURE2_PEAK, | |
308 | &data->temp2_max); | |
ddfb41ca GR |
309 | break; |
310 | case PMBUS_VIRT_READ_VIN_MIN: | |
311 | case PMBUS_VIRT_READ_VOUT_MIN: | |
312 | case PMBUS_VIRT_READ_TEMP_MIN: | |
313 | ret = -ENXIO; | |
314 | break; | |
315 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
316 | case PMBUS_VIRT_RESET_TEMP2_HISTORY: | |
c3ff9a67 GR |
317 | ret = 0; |
318 | break; | |
319 | default: | |
ddfb41ca | 320 | ret = ltc2978_read_word_data_common(client, page, reg); |
c3ff9a67 GR |
321 | break; |
322 | } | |
323 | return ret; | |
324 | } | |
325 | ||
fd9175d2 GR |
326 | static int ltc3883_read_word_data(struct i2c_client *client, int page, int reg) |
327 | { | |
328 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
329 | struct ltc2978_data *data = to_ltc2978_data(info); | |
330 | int ret; | |
331 | ||
332 | switch (reg) { | |
333 | case PMBUS_VIRT_READ_IIN_MAX: | |
ee847a25 GR |
334 | ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK, |
335 | &data->iin_max); | |
fd9175d2 GR |
336 | break; |
337 | case PMBUS_VIRT_RESET_IIN_HISTORY: | |
338 | ret = 0; | |
339 | break; | |
340 | default: | |
341 | ret = ltc3880_read_word_data(client, page, reg); | |
342 | break; | |
343 | } | |
344 | return ret; | |
345 | } | |
346 | ||
8582bcc8 GR |
347 | static int ltc2978_clear_peaks(struct ltc2978_data *data, |
348 | struct i2c_client *client, int page) | |
ddfb41ca GR |
349 | { |
350 | int ret; | |
351 | ||
8582bcc8 | 352 | if (has_clear_peaks(data)) |
ddfb41ca | 353 | ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS); |
fd9175d2 GR |
354 | else |
355 | ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); | |
ddfb41ca GR |
356 | |
357 | return ret; | |
358 | } | |
359 | ||
c3ff9a67 GR |
360 | static int ltc2978_write_word_data(struct i2c_client *client, int page, |
361 | int reg, u16 word) | |
362 | { | |
363 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
364 | struct ltc2978_data *data = to_ltc2978_data(info); | |
365 | int ret; | |
366 | ||
367 | switch (reg) { | |
fd9175d2 GR |
368 | case PMBUS_VIRT_RESET_IIN_HISTORY: |
369 | data->iin_max = 0x7c00; | |
649ca820 | 370 | data->iin_min = 0x7bff; |
8582bcc8 | 371 | ret = ltc2978_clear_peaks(data, client, 0); |
649ca820 GR |
372 | break; |
373 | case PMBUS_VIRT_RESET_PIN_HISTORY: | |
374 | data->pin_max = 0x7c00; | |
375 | data->pin_min = 0x7bff; | |
8582bcc8 | 376 | ret = ltc2978_clear_peaks(data, client, 0); |
fd9175d2 | 377 | break; |
ddfb41ca | 378 | case PMBUS_VIRT_RESET_IOUT_HISTORY: |
dbd712c2 | 379 | data->iout_max[page] = 0x7c00; |
fd9175d2 | 380 | data->iout_min[page] = 0xfbff; |
8582bcc8 | 381 | ret = ltc2978_clear_peaks(data, client, page); |
ddfb41ca GR |
382 | break; |
383 | case PMBUS_VIRT_RESET_TEMP2_HISTORY: | |
dbd712c2 | 384 | data->temp2_max = 0x7c00; |
8582bcc8 | 385 | ret = ltc2978_clear_peaks(data, client, page); |
ddfb41ca | 386 | break; |
c3ff9a67 GR |
387 | case PMBUS_VIRT_RESET_VOUT_HISTORY: |
388 | data->vout_min[page] = 0xffff; | |
389 | data->vout_max[page] = 0; | |
8582bcc8 | 390 | ret = ltc2978_clear_peaks(data, client, page); |
c3ff9a67 GR |
391 | break; |
392 | case PMBUS_VIRT_RESET_VIN_HISTORY: | |
393 | data->vin_min = 0x7bff; | |
dbd712c2 | 394 | data->vin_max = 0x7c00; |
8582bcc8 | 395 | ret = ltc2978_clear_peaks(data, client, page); |
c3ff9a67 GR |
396 | break; |
397 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
fd9175d2 | 398 | data->temp_min[page] = 0x7bff; |
8c958c70 | 399 | data->temp_max[page] = 0x7c00; |
8582bcc8 | 400 | ret = ltc2978_clear_peaks(data, client, page); |
c3ff9a67 GR |
401 | break; |
402 | default: | |
403 | ret = -ENODATA; | |
404 | break; | |
405 | } | |
406 | return ret; | |
407 | } | |
408 | ||
409 | static const struct i2c_device_id ltc2978_id[] = { | |
fd9175d2 | 410 | {"ltc2974", ltc2974}, |
649ca820 | 411 | {"ltc2975", ltc2975}, |
c24c407e | 412 | {"ltc2977", ltc2977}, |
c3ff9a67 | 413 | {"ltc2978", ltc2978}, |
ddfb41ca | 414 | {"ltc3880", ltc3880}, |
bf89386f | 415 | {"ltc3882", ltc3882}, |
fd9175d2 | 416 | {"ltc3883", ltc3883}, |
15398566 | 417 | {"ltc3887", ltc3887}, |
f76992b0 | 418 | {"ltm4676", ltm4676}, |
c3ff9a67 GR |
419 | {} |
420 | }; | |
421 | MODULE_DEVICE_TABLE(i2c, ltc2978_id); | |
422 | ||
77aa3585 AT |
423 | #if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR) |
424 | static const struct regulator_desc ltc2978_reg_desc[] = { | |
425 | PMBUS_REGULATOR("vout", 0), | |
426 | PMBUS_REGULATOR("vout", 1), | |
427 | PMBUS_REGULATOR("vout", 2), | |
428 | PMBUS_REGULATOR("vout", 3), | |
429 | PMBUS_REGULATOR("vout", 4), | |
430 | PMBUS_REGULATOR("vout", 5), | |
431 | PMBUS_REGULATOR("vout", 6), | |
432 | PMBUS_REGULATOR("vout", 7), | |
433 | }; | |
434 | #endif /* CONFIG_SENSORS_LTC2978_REGULATOR */ | |
435 | ||
836954da GR |
436 | static int ltc2978_get_id(struct i2c_client *client) |
437 | { | |
438 | int chip_id; | |
439 | ||
440 | chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID); | |
bf89386f GR |
441 | if (chip_id < 0) { |
442 | const struct i2c_device_id *id; | |
443 | u8 buf[I2C_SMBUS_BLOCK_MAX]; | |
444 | int ret; | |
445 | ||
446 | if (!i2c_check_functionality(client->adapter, | |
447 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) | |
448 | return -ENODEV; | |
449 | ||
450 | ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); | |
451 | if (ret < 0) | |
452 | return ret; | |
453 | if (ret < 3 || strncmp(buf, "LTC", 3)) | |
454 | return -ENODEV; | |
455 | ||
456 | ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); | |
457 | if (ret < 0) | |
458 | return ret; | |
459 | for (id = <c2978_id[0]; strlen(id->name); id++) { | |
460 | if (!strncasecmp(id->name, buf, strlen(id->name))) | |
461 | return (int)id->driver_data; | |
462 | } | |
463 | return -ENODEV; | |
464 | } | |
836954da GR |
465 | |
466 | if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2) | |
467 | return ltc2974; | |
649ca820 GR |
468 | else if (chip_id == LTC2975_ID) |
469 | return ltc2975; | |
836954da GR |
470 | else if (chip_id == LTC2977_ID) |
471 | return ltc2977; | |
472 | else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 || | |
473 | chip_id == LTC2978A_ID) | |
474 | return ltc2978; | |
475 | else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) | |
476 | return ltc3880; | |
477 | else if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID) | |
478 | return ltc3883; | |
15398566 GR |
479 | else if ((chip_id & LTC3887_ID_MASK) == LTC3887_ID) |
480 | return ltc3887; | |
e8047a26 GR |
481 | else if ((chip_id & LTM4676_ID_MASK) == LTM4676_ID || |
482 | (chip_id & LTM4676_ID_MASK) == LTM4676_ID_2 || | |
483 | (chip_id & LTM4676_ID_MASK) == LTM4676A_ID) | |
836954da GR |
484 | return ltm4676; |
485 | ||
486 | dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id); | |
487 | return -ENODEV; | |
488 | } | |
489 | ||
c3ff9a67 GR |
490 | static int ltc2978_probe(struct i2c_client *client, |
491 | const struct i2c_device_id *id) | |
492 | { | |
836954da | 493 | int i, chip_id; |
c3ff9a67 GR |
494 | struct ltc2978_data *data; |
495 | struct pmbus_driver_info *info; | |
496 | ||
497 | if (!i2c_check_functionality(client->adapter, | |
498 | I2C_FUNC_SMBUS_READ_WORD_DATA)) | |
499 | return -ENODEV; | |
500 | ||
8b313ca7 GR |
501 | data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data), |
502 | GFP_KERNEL); | |
c3ff9a67 GR |
503 | if (!data) |
504 | return -ENOMEM; | |
505 | ||
836954da | 506 | chip_id = ltc2978_get_id(client); |
8b313ca7 GR |
507 | if (chip_id < 0) |
508 | return chip_id; | |
c3ff9a67 | 509 | |
836954da | 510 | data->id = chip_id; |
c3ff9a67 GR |
511 | if (data->id != id->driver_data) |
512 | dev_warn(&client->dev, | |
513 | "Device mismatch: Configured %s, detected %s\n", | |
514 | id->name, | |
515 | ltc2978_id[data->id].name); | |
516 | ||
517 | info = &data->info; | |
c3ff9a67 GR |
518 | info->write_word_data = ltc2978_write_word_data; |
519 | ||
c3ff9a67 | 520 | data->vin_min = 0x7bff; |
dbd712c2 | 521 | data->vin_max = 0x7c00; |
3d0d2839 GR |
522 | for (i = 0; i < ARRAY_SIZE(data->vout_min); i++) |
523 | data->vout_min[i] = 0xffff; | |
fd9175d2 GR |
524 | for (i = 0; i < ARRAY_SIZE(data->iout_min); i++) |
525 | data->iout_min[i] = 0xfbff; | |
526 | for (i = 0; i < ARRAY_SIZE(data->iout_max); i++) | |
527 | data->iout_max[i] = 0x7c00; | |
528 | for (i = 0; i < ARRAY_SIZE(data->temp_min); i++) | |
529 | data->temp_min[i] = 0x7bff; | |
8c958c70 GR |
530 | for (i = 0; i < ARRAY_SIZE(data->temp_max); i++) |
531 | data->temp_max[i] = 0x7c00; | |
dbd712c2 | 532 | data->temp2_max = 0x7c00; |
c3ff9a67 | 533 | |
f366fccd | 534 | switch (data->id) { |
fd9175d2 GR |
535 | case ltc2974: |
536 | info->read_word_data = ltc2974_read_word_data; | |
537 | info->pages = LTC2974_NUM_PAGES; | |
538 | info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | |
539 | | PMBUS_HAVE_TEMP2; | |
540 | for (i = 0; i < info->pages; i++) { | |
541 | info->func[i] |= PMBUS_HAVE_VOUT | |
542 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT | |
543 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | |
544 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; | |
545 | } | |
546 | break; | |
649ca820 GR |
547 | case ltc2975: |
548 | info->read_word_data = ltc2975_read_word_data; | |
549 | info->pages = LTC2974_NUM_PAGES; | |
550 | info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | |
551 | | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | |
552 | | PMBUS_HAVE_TEMP2; | |
553 | for (i = 0; i < info->pages; i++) { | |
554 | info->func[i] |= PMBUS_HAVE_VOUT | |
555 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT | |
556 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | |
557 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; | |
558 | } | |
559 | break; | |
c24c407e | 560 | case ltc2977: |
c3ff9a67 | 561 | case ltc2978: |
ddfb41ca | 562 | info->read_word_data = ltc2978_read_word_data; |
3d0d2839 | 563 | info->pages = LTC2978_NUM_PAGES; |
c3ff9a67 GR |
564 | info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
565 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
566 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; | |
3d0d2839 | 567 | for (i = 1; i < LTC2978_NUM_PAGES; i++) { |
c3ff9a67 GR |
568 | info->func[i] = PMBUS_HAVE_VOUT |
569 | | PMBUS_HAVE_STATUS_VOUT; | |
c3ff9a67 GR |
570 | } |
571 | break; | |
ddfb41ca | 572 | case ltc3880: |
15398566 | 573 | case ltc3887: |
f76992b0 | 574 | case ltm4676: |
8582bcc8 | 575 | data->features |= FEAT_CLEAR_PEAKS; |
ddfb41ca | 576 | info->read_word_data = ltc3880_read_word_data; |
3d0d2839 | 577 | info->pages = LTC3880_NUM_PAGES; |
ddfb41ca GR |
578 | info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
579 | | PMBUS_HAVE_STATUS_INPUT | |
580 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
581 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
582 | | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | |
583 | | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; | |
584 | info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
585 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
586 | | PMBUS_HAVE_POUT | |
587 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; | |
fd9175d2 | 588 | break; |
bf89386f | 589 | case ltc3882: |
8582bcc8 | 590 | data->features |= FEAT_CLEAR_PEAKS; |
bf89386f GR |
591 | info->read_word_data = ltc3880_read_word_data; |
592 | info->pages = LTC3880_NUM_PAGES; | |
593 | info->func[0] = PMBUS_HAVE_VIN | |
594 | | PMBUS_HAVE_STATUS_INPUT | |
595 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
596 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
597 | | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | |
598 | | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; | |
599 | info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
600 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
601 | | PMBUS_HAVE_POUT | |
602 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; | |
603 | break; | |
fd9175d2 | 604 | case ltc3883: |
8582bcc8 | 605 | data->features |= FEAT_CLEAR_PEAKS; |
fd9175d2 GR |
606 | info->read_word_data = ltc3883_read_word_data; |
607 | info->pages = LTC3883_NUM_PAGES; | |
608 | info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | |
609 | | PMBUS_HAVE_STATUS_INPUT | |
610 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
611 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
612 | | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | |
613 | | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; | |
ddfb41ca | 614 | break; |
c3ff9a67 | 615 | default: |
8b313ca7 | 616 | return -ENODEV; |
c3ff9a67 | 617 | } |
77aa3585 AT |
618 | |
619 | #if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR) | |
620 | info->num_regulators = info->pages; | |
621 | info->reg_desc = ltc2978_reg_desc; | |
622 | if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) { | |
623 | dev_err(&client->dev, "num_regulators too large!"); | |
624 | info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc); | |
625 | } | |
626 | #endif | |
627 | ||
8b313ca7 | 628 | return pmbus_do_probe(client, id, info); |
c3ff9a67 GR |
629 | } |
630 | ||
77aa3585 AT |
631 | #ifdef CONFIG_OF |
632 | static const struct of_device_id ltc2978_of_match[] = { | |
633 | { .compatible = "lltc,ltc2974" }, | |
649ca820 | 634 | { .compatible = "lltc,ltc2975" }, |
77aa3585 AT |
635 | { .compatible = "lltc,ltc2977" }, |
636 | { .compatible = "lltc,ltc2978" }, | |
637 | { .compatible = "lltc,ltc3880" }, | |
bf89386f | 638 | { .compatible = "lltc,ltc3882" }, |
77aa3585 | 639 | { .compatible = "lltc,ltc3883" }, |
15398566 | 640 | { .compatible = "lltc,ltc3887" }, |
77aa3585 AT |
641 | { .compatible = "lltc,ltm4676" }, |
642 | { } | |
643 | }; | |
644 | MODULE_DEVICE_TABLE(of, ltc2978_of_match); | |
645 | #endif | |
646 | ||
c3ff9a67 GR |
647 | static struct i2c_driver ltc2978_driver = { |
648 | .driver = { | |
649 | .name = "ltc2978", | |
77aa3585 | 650 | .of_match_table = of_match_ptr(ltc2978_of_match), |
c3ff9a67 GR |
651 | }, |
652 | .probe = ltc2978_probe, | |
dd285ad7 | 653 | .remove = pmbus_do_remove, |
c3ff9a67 GR |
654 | .id_table = ltc2978_id, |
655 | }; | |
656 | ||
f0967eea | 657 | module_i2c_driver(ltc2978_driver); |
c3ff9a67 GR |
658 | |
659 | MODULE_AUTHOR("Guenter Roeck"); | |
649ca820 | 660 | MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips"); |
c3ff9a67 | 661 | MODULE_LICENSE("GPL"); |