2 * Hardware monitoring driver for LM25056 / LM25066 / LM5064 / LM5066
4 * Copyright (c) 2011 Ericsson AB.
5 * Copyright (c) 2013 Guenter Roeck
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.
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.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/bitops.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/err.h>
27 #include <linux/slab.h>
28 #include <linux/i2c.h>
31 enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i };
33 #define LM25066_READ_VAUX 0xd0
34 #define LM25066_MFR_READ_IIN 0xd1
35 #define LM25066_MFR_READ_PIN 0xd2
36 #define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3
37 #define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4
38 #define LM25066_READ_PIN_PEAK 0xd5
39 #define LM25066_CLEAR_PIN_PEAK 0xd6
40 #define LM25066_DEVICE_SETUP 0xd9
41 #define LM25066_READ_AVG_VIN 0xdc
42 #define LM25066_READ_AVG_VOUT 0xdd
43 #define LM25066_READ_AVG_IIN 0xde
44 #define LM25066_READ_AVG_PIN 0xdf
46 #define LM25066_DEV_SETUP_CL BIT(4) /* Current limit */
50 #define LM25056_VAUX_OV_WARN_LIMIT 0xe3
51 #define LM25056_VAUX_UV_WARN_LIMIT 0xe4
53 #define LM25056_MFR_STS_VAUX_OV_WARN BIT(1)
54 #define LM25056_MFR_STS_VAUX_UV_WARN BIT(0)
60 #define PSC_CURRENT_IN_L (PSC_NUM_CLASSES)
61 #define PSC_POWER_L (PSC_NUM_CLASSES + 1)
63 static struct __coeff lm25066_coeff[6][PSC_NUM_CLASSES + 2] = {
73 [PSC_CURRENT_IN_L] = {
104 [PSC_CURRENT_IN_L] = {
116 [PSC_TEMPERATURE] = {
125 [PSC_VOLTAGE_OUT] = {
133 [PSC_CURRENT_IN_L] = {
145 [PSC_TEMPERATURE] = {
154 [PSC_VOLTAGE_OUT] = {
162 [PSC_CURRENT_IN_L] = {
174 [PSC_TEMPERATURE] = {
184 [PSC_VOLTAGE_OUT] = {
194 [PSC_CURRENT_IN_L] = {
209 [PSC_TEMPERATURE] = {
215 struct lm25066_data {
217 u16 rlimit; /* Maximum register value */
218 struct pmbus_driver_info info;
221 #define to_lm25066_data(x) container_of(x, struct lm25066_data, info)
223 static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
225 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
226 const struct lm25066_data *data = to_lm25066_data(info);
230 case PMBUS_VIRT_READ_VMON:
231 ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
234 /* Adjust returned value to match VIN coefficients */
237 /* VIN: 6.14 mV VAUX: 293 uV LSB */
238 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
241 /* VIN: 4.54 mV VAUX: 283.2 uV LSB */
242 ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
245 /* VIN: 4.53 mV VAUX: 700 uV LSB */
246 ret = DIV_ROUND_CLOSEST(ret * 70, 453);
250 /* VIN: 2.18 mV VAUX: 725 uV LSB */
251 ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
256 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
259 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
261 case PMBUS_IIN_OC_WARN_LIMIT:
262 ret = pmbus_read_word_data(client, 0,
263 LM25066_MFR_IIN_OC_WARN_LIMIT);
265 case PMBUS_PIN_OP_WARN_LIMIT:
266 ret = pmbus_read_word_data(client, 0,
267 LM25066_MFR_PIN_OP_WARN_LIMIT);
269 case PMBUS_VIRT_READ_VIN_AVG:
270 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
272 case PMBUS_VIRT_READ_VOUT_AVG:
273 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
275 case PMBUS_VIRT_READ_IIN_AVG:
276 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
278 case PMBUS_VIRT_READ_PIN_AVG:
279 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
281 case PMBUS_VIRT_READ_PIN_MAX:
282 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
284 case PMBUS_VIRT_RESET_PIN_HISTORY:
294 static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
299 case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
300 ret = pmbus_read_word_data(client, 0,
301 LM25056_VAUX_UV_WARN_LIMIT);
304 /* Adjust returned value to match VIN coefficients */
305 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
307 case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
308 ret = pmbus_read_word_data(client, 0,
309 LM25056_VAUX_OV_WARN_LIMIT);
312 /* Adjust returned value to match VIN coefficients */
313 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
316 ret = lm25066_read_word_data(client, page, reg);
322 static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
327 case PMBUS_VIRT_STATUS_VMON:
328 ret = pmbus_read_byte_data(client, 0,
329 PMBUS_STATUS_MFR_SPECIFIC);
333 if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
334 s |= PB_VOLTAGE_UV_WARNING;
335 if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
336 s |= PB_VOLTAGE_OV_WARNING;
346 static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
349 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
350 const struct lm25066_data *data = to_lm25066_data(info);
354 case PMBUS_POUT_OP_FAULT_LIMIT:
355 case PMBUS_POUT_OP_WARN_LIMIT:
356 case PMBUS_VOUT_UV_WARN_LIMIT:
357 case PMBUS_OT_FAULT_LIMIT:
358 case PMBUS_OT_WARN_LIMIT:
359 case PMBUS_IIN_OC_FAULT_LIMIT:
360 case PMBUS_VIN_UV_WARN_LIMIT:
361 case PMBUS_VIN_UV_FAULT_LIMIT:
362 case PMBUS_VIN_OV_FAULT_LIMIT:
363 case PMBUS_VIN_OV_WARN_LIMIT:
364 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
365 ret = pmbus_write_word_data(client, 0, reg, word);
366 pmbus_clear_cache(client);
368 case PMBUS_IIN_OC_WARN_LIMIT:
369 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
370 ret = pmbus_write_word_data(client, 0,
371 LM25066_MFR_IIN_OC_WARN_LIMIT,
373 pmbus_clear_cache(client);
375 case PMBUS_PIN_OP_WARN_LIMIT:
376 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
377 ret = pmbus_write_word_data(client, 0,
378 LM25066_MFR_PIN_OP_WARN_LIMIT,
380 pmbus_clear_cache(client);
382 case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
383 /* Adjust from VIN coefficients (for LM25056) */
384 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
385 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
386 ret = pmbus_write_word_data(client, 0,
387 LM25056_VAUX_UV_WARN_LIMIT, word);
388 pmbus_clear_cache(client);
390 case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
391 /* Adjust from VIN coefficients (for LM25056) */
392 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
393 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
394 ret = pmbus_write_word_data(client, 0,
395 LM25056_VAUX_OV_WARN_LIMIT, word);
396 pmbus_clear_cache(client);
398 case PMBUS_VIRT_RESET_PIN_HISTORY:
399 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
408 static int lm25066_probe(struct i2c_client *client,
409 const struct i2c_device_id *id)
412 struct lm25066_data *data;
413 struct pmbus_driver_info *info;
414 struct __coeff *coeff;
416 if (!i2c_check_functionality(client->adapter,
417 I2C_FUNC_SMBUS_READ_BYTE_DATA))
420 data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
425 config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
429 data->id = id->driver_data;
433 info->format[PSC_VOLTAGE_IN] = direct;
434 info->format[PSC_VOLTAGE_OUT] = direct;
435 info->format[PSC_CURRENT_IN] = direct;
436 info->format[PSC_TEMPERATURE] = direct;
437 info->format[PSC_POWER] = direct;
439 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
440 | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
441 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
443 if (data->id == lm25056) {
444 info->func[0] |= PMBUS_HAVE_STATUS_VMON;
445 info->read_word_data = lm25056_read_word_data;
446 info->read_byte_data = lm25056_read_byte_data;
447 data->rlimit = 0x0fff;
449 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
450 info->read_word_data = lm25066_read_word_data;
451 data->rlimit = 0x0fff;
453 info->write_word_data = lm25066_write_word_data;
455 coeff = &lm25066_coeff[data->id][0];
456 info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
457 info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
458 info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
459 info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
460 info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
461 info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
462 info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
463 info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
464 info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
465 info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
466 info->R[PSC_POWER] = coeff[PSC_POWER].R;
467 if (config & LM25066_DEV_SETUP_CL) {
468 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
469 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].b;
470 info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
471 info->b[PSC_POWER] = coeff[PSC_POWER_L].b;
473 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
474 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
475 info->m[PSC_POWER] = coeff[PSC_POWER].m;
476 info->b[PSC_POWER] = coeff[PSC_POWER].b;
479 return pmbus_do_probe(client, id, info);
482 static const struct i2c_device_id lm25066_id[] = {
483 {"lm25056", lm25056},
484 {"lm25066", lm25066},
487 {"lm5066i", lm5066i},
491 MODULE_DEVICE_TABLE(i2c, lm25066_id);
493 /* This is the driver that will be inserted */
494 static struct i2c_driver lm25066_driver = {
498 .probe = lm25066_probe,
499 .remove = pmbus_do_remove,
500 .id_table = lm25066_id,
503 module_i2c_driver(lm25066_driver);
505 MODULE_AUTHOR("Guenter Roeck");
506 MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
507 MODULE_LICENSE("GPL");