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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for Texas Instruments TMP512, TMP513 power monitor chips
4 *
5 * TMP513:
6 * Thermal/Power Management with Triple Remote and
7 * Local Temperature Sensor and Current Shunt Monitor
8 * Datasheet: https://www.ti.com/lit/gpn/tmp513
9 *
10 * TMP512:
11 * Thermal/Power Management with Dual Remote
12 * and Local Temperature Sensor and Current Shunt Monitor
13 * Datasheet: https://www.ti.com/lit/gpn/tmp512
14 *
15 * Copyright (C) 2019 Eric Tremblay <[email protected]>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; version 2 of the License.
20 */
21
22#include <linux/bitops.h>
23#include <linux/bug.h>
24#include <linux/device.h>
25#include <linux/err.h>
26#include <linux/hwmon.h>
27#include <linux/i2c.h>
28#include <linux/init.h>
29#include <linux/math.h>
30#include <linux/module.h>
31#include <linux/property.h>
32#include <linux/regmap.h>
33#include <linux/slab.h>
34#include <linux/types.h>
35#include <linux/units.h>
36
37// Common register definition
38#define TMP51X_SHUNT_CONFIG 0x00
39#define TMP51X_TEMP_CONFIG 0x01
40#define TMP51X_STATUS 0x02
41#define TMP51X_SMBUS_ALERT 0x03
42#define TMP51X_SHUNT_CURRENT_RESULT 0x04
43#define TMP51X_BUS_VOLTAGE_RESULT 0x05
44#define TMP51X_POWER_RESULT 0x06
45#define TMP51X_BUS_CURRENT_RESULT 0x07
46#define TMP51X_LOCAL_TEMP_RESULT 0x08
47#define TMP51X_REMOTE_TEMP_RESULT_1 0x09
48#define TMP51X_REMOTE_TEMP_RESULT_2 0x0A
49#define TMP51X_SHUNT_CURRENT_H_LIMIT 0x0C
50#define TMP51X_SHUNT_CURRENT_L_LIMIT 0x0D
51#define TMP51X_BUS_VOLTAGE_H_LIMIT 0x0E
52#define TMP51X_BUS_VOLTAGE_L_LIMIT 0x0F
53#define TMP51X_POWER_LIMIT 0x10
54#define TMP51X_LOCAL_TEMP_LIMIT 0x11
55#define TMP51X_REMOTE_TEMP_LIMIT_1 0x12
56#define TMP51X_REMOTE_TEMP_LIMIT_2 0x13
57#define TMP51X_SHUNT_CALIBRATION 0x15
58#define TMP51X_N_FACTOR_AND_HYST_1 0x16
59#define TMP51X_N_FACTOR_2 0x17
60#define TMP51X_MAN_ID_REG 0xFE
61#define TMP51X_DEVICE_ID_REG 0xFF
62
63// TMP513 specific register definition
64#define TMP513_REMOTE_TEMP_RESULT_3 0x0B
65#define TMP513_REMOTE_TEMP_LIMIT_3 0x14
66#define TMP513_N_FACTOR_3 0x18
67
68// Common attrs, and NULL
69#define TMP51X_MANUFACTURER_ID 0x55FF
70
71#define TMP512_DEVICE_ID 0x22FF
72#define TMP513_DEVICE_ID 0x23FF
73
74// Default config
75#define TMP51X_SHUNT_CONFIG_DEFAULT 0x399F
76#define TMP51X_SHUNT_VALUE_DEFAULT 1000
77#define TMP51X_VBUS_RANGE_DEFAULT TMP51X_VBUS_RANGE_32V
78#define TMP51X_PGA_DEFAULT 8
79#define TMP51X_MAX_REGISTER_ADDR 0xFF
80
81// Mask and shift
82#define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800
83#define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000
84#define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800
85#define CURRENT_SENSE_VOLTAGE_40_MASK 0
86
87#define TMP51X_BUS_VOLTAGE_MASK 0x2000
88#define TMP51X_NFACTOR_MASK 0xFF00
89#define TMP51X_HYST_MASK 0x00FF
90
91#define TMP51X_BUS_VOLTAGE_SHIFT 3
92#define TMP51X_TEMP_SHIFT 3
93
94// Alarms
95#define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15
96#define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14
97#define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13
98#define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12
99#define TMP51X_POWER_LIMIT_POS 11
100#define TMP51X_LOCAL_TEMP_LIMIT_POS 10
101#define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9
102#define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8
103#define TMP513_REMOTE_TEMP_LIMIT_3_POS 7
104
105#define TMP51X_VBUS_RANGE_32V (32 * MICRO)
106#define TMP51X_VBUS_RANGE_16V (16 * MICRO)
107
108// Max and Min value
109#define MAX_BUS_VOLTAGE_32_LIMIT 32764
110#define MAX_BUS_VOLTAGE_16_LIMIT 16382
111
112// Max possible value is -256 to +256 but datasheet indicated -40 to 125.
113#define MAX_TEMP_LIMIT 125000
114#define MIN_TEMP_LIMIT -40000
115
116#define MAX_TEMP_HYST 127500
117
118#define TMP512_MAX_CHANNELS 3
119#define TMP513_MAX_CHANNELS 4
120
121#define TMP51X_TEMP_CONFIG_CONV_RATE GENMASK(9, 7)
122#define TMP51X_TEMP_CONFIG_RC BIT(10)
123#define TMP51X_TEMP_CHANNEL_MASK(n) (GENMASK((n) - 1, 0) << 11)
124#define TMP51X_TEMP_CONFIG_CONT BIT(15)
125#define TMP51X_TEMP_CONFIG_DEFAULT(n) \
126 (TMP51X_TEMP_CHANNEL_MASK(n) | TMP51X_TEMP_CONFIG_CONT | \
127 TMP51X_TEMP_CONFIG_CONV_RATE | TMP51X_TEMP_CONFIG_RC)
128
129static const u8 TMP51X_TEMP_INPUT[4] = {
130 TMP51X_LOCAL_TEMP_RESULT,
131 TMP51X_REMOTE_TEMP_RESULT_1,
132 TMP51X_REMOTE_TEMP_RESULT_2,
133 TMP513_REMOTE_TEMP_RESULT_3
134};
135
136static const u8 TMP51X_TEMP_CRIT[4] = {
137 TMP51X_LOCAL_TEMP_LIMIT,
138 TMP51X_REMOTE_TEMP_LIMIT_1,
139 TMP51X_REMOTE_TEMP_LIMIT_2,
140 TMP513_REMOTE_TEMP_LIMIT_3
141};
142
143static const u8 TMP51X_TEMP_CRIT_ALARM[4] = {
144 TMP51X_LOCAL_TEMP_LIMIT_POS,
145 TMP51X_REMOTE_TEMP_LIMIT_1_POS,
146 TMP51X_REMOTE_TEMP_LIMIT_2_POS,
147 TMP513_REMOTE_TEMP_LIMIT_3_POS
148};
149
150static const u8 TMP51X_TEMP_CRIT_HYST[4] = {
151 TMP51X_N_FACTOR_AND_HYST_1,
152 TMP51X_N_FACTOR_AND_HYST_1,
153 TMP51X_N_FACTOR_AND_HYST_1,
154 TMP51X_N_FACTOR_AND_HYST_1
155};
156
157static const u8 TMP51X_CURR_INPUT[2] = {
158 TMP51X_SHUNT_CURRENT_RESULT,
159 TMP51X_BUS_CURRENT_RESULT
160};
161
162static const struct regmap_config tmp51x_regmap_config = {
163 .reg_bits = 8,
164 .val_bits = 16,
165 .max_register = TMP51X_MAX_REGISTER_ADDR,
166};
167
168struct tmp51x_data {
169 u16 shunt_config;
170 u16 pga_gain;
171 u32 vbus_range_uvolt;
172
173 u16 temp_config;
174 u32 nfactor[3];
175
176 u32 shunt_uohms;
177
178 u32 curr_lsb_ua;
179 u32 pwr_lsb_uw;
180
181 u8 max_channels;
182 struct regmap *regmap;
183};
184
185// Set the shift based on the gain: 8 -> 1, 4 -> 2, 2 -> 3, 1 -> 4
186static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data)
187{
188 return 5 - ffs(data->pga_gain);
189}
190
191static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos,
192 unsigned int regval, long *val)
193{
194 switch (reg) {
195 case TMP51X_STATUS:
196 *val = (regval >> pos) & 1;
197 break;
198 case TMP51X_SHUNT_CURRENT_RESULT:
199 case TMP51X_SHUNT_CURRENT_H_LIMIT:
200 case TMP51X_SHUNT_CURRENT_L_LIMIT:
201 /*
202 * The valus is read in voltage in the chip but reported as
203 * current to the user.
204 * 2's complement number shifted by one to four depending
205 * on the pga gain setting. 1lsb = 10uV
206 */
207 *val = sign_extend32(regval,
208 reg == TMP51X_SHUNT_CURRENT_RESULT ?
209 16 - tmp51x_get_pga_shift(data) : 15);
210 *val = DIV_ROUND_CLOSEST(*val * 10 * (long)MILLI, (long)data->shunt_uohms);
211
212 break;
213 case TMP51X_BUS_VOLTAGE_RESULT:
214 case TMP51X_BUS_VOLTAGE_H_LIMIT:
215 case TMP51X_BUS_VOLTAGE_L_LIMIT:
216 // 1lsb = 4mV
217 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4;
218 break;
219 case TMP51X_POWER_RESULT:
220 case TMP51X_POWER_LIMIT:
221 // Power = (current * BusVoltage) / 5000
222 *val = regval * data->pwr_lsb_uw;
223 break;
224 case TMP51X_BUS_CURRENT_RESULT:
225 // Current = (ShuntVoltage * CalibrationRegister) / 4096
226 *val = sign_extend32(regval, 15) * (long)data->curr_lsb_ua;
227 *val = DIV_ROUND_CLOSEST(*val, (long)MILLI);
228 break;
229 case TMP51X_LOCAL_TEMP_RESULT:
230 case TMP51X_REMOTE_TEMP_RESULT_1:
231 case TMP51X_REMOTE_TEMP_RESULT_2:
232 case TMP513_REMOTE_TEMP_RESULT_3:
233 case TMP51X_LOCAL_TEMP_LIMIT:
234 case TMP51X_REMOTE_TEMP_LIMIT_1:
235 case TMP51X_REMOTE_TEMP_LIMIT_2:
236 case TMP513_REMOTE_TEMP_LIMIT_3:
237 // 1lsb = 0.0625 degrees centigrade
238 *val = sign_extend32(regval, 15) >> TMP51X_TEMP_SHIFT;
239 *val = DIV_ROUND_CLOSEST(*val * 625, 10);
240 break;
241 case TMP51X_N_FACTOR_AND_HYST_1:
242 // 1lsb = 0.5 degrees centigrade
243 *val = (regval & TMP51X_HYST_MASK) * 500;
244 break;
245 default:
246 // Programmer goofed
247 WARN_ON_ONCE(1);
248 *val = 0;
249 return -EOPNOTSUPP;
250 }
251
252 return 0;
253}
254
255static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val)
256{
257 int regval, max_val;
258 u32 mask = 0;
259
260 switch (reg) {
261 case TMP51X_SHUNT_CURRENT_H_LIMIT:
262 case TMP51X_SHUNT_CURRENT_L_LIMIT:
263 /*
264 * The user enter current value and we convert it to
265 * voltage. 1lsb = 10uV
266 */
267 val = DIV_ROUND_CLOSEST(val * (long)data->shunt_uohms, 10 * (long)MILLI);
268 max_val = U16_MAX >> tmp51x_get_pga_shift(data);
269 regval = clamp_val(val, -max_val, max_val);
270 break;
271 case TMP51X_BUS_VOLTAGE_H_LIMIT:
272 case TMP51X_BUS_VOLTAGE_L_LIMIT:
273 // 1lsb = 4mV
274 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ?
275 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT;
276
277 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val);
278 regval = val << TMP51X_BUS_VOLTAGE_SHIFT;
279 break;
280 case TMP51X_POWER_LIMIT:
281 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0,
282 U16_MAX);
283 break;
284 case TMP51X_LOCAL_TEMP_LIMIT:
285 case TMP51X_REMOTE_TEMP_LIMIT_1:
286 case TMP51X_REMOTE_TEMP_LIMIT_2:
287 case TMP513_REMOTE_TEMP_LIMIT_3:
288 // 1lsb = 0.0625 degrees centigrade
289 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT);
290 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT;
291 break;
292 case TMP51X_N_FACTOR_AND_HYST_1:
293 // 1lsb = 0.5 degrees centigrade
294 val = clamp_val(val, 0, MAX_TEMP_HYST);
295 regval = DIV_ROUND_CLOSEST(val, 500);
296 mask = TMP51X_HYST_MASK;
297 break;
298 default:
299 // Programmer goofed
300 WARN_ON_ONCE(1);
301 return -EOPNOTSUPP;
302 }
303
304 if (mask == 0)
305 return regmap_write(data->regmap, reg, regval);
306 else
307 return regmap_update_bits(data->regmap, reg, mask, regval);
308}
309
310static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel)
311{
312 switch (type) {
313 case hwmon_temp:
314 switch (attr) {
315 case hwmon_temp_input:
316 return TMP51X_TEMP_INPUT[channel];
317 case hwmon_temp_crit_alarm:
318 return TMP51X_STATUS;
319 case hwmon_temp_crit:
320 return TMP51X_TEMP_CRIT[channel];
321 case hwmon_temp_crit_hyst:
322 return TMP51X_TEMP_CRIT_HYST[channel];
323 }
324 break;
325 case hwmon_in:
326 switch (attr) {
327 case hwmon_in_input:
328 return TMP51X_BUS_VOLTAGE_RESULT;
329 case hwmon_in_lcrit_alarm:
330 case hwmon_in_crit_alarm:
331 return TMP51X_STATUS;
332 case hwmon_in_lcrit:
333 return TMP51X_BUS_VOLTAGE_L_LIMIT;
334 case hwmon_in_crit:
335 return TMP51X_BUS_VOLTAGE_H_LIMIT;
336 }
337 break;
338 case hwmon_curr:
339 switch (attr) {
340 case hwmon_curr_input:
341 return TMP51X_CURR_INPUT[channel];
342 case hwmon_curr_lcrit_alarm:
343 case hwmon_curr_crit_alarm:
344 return TMP51X_STATUS;
345 case hwmon_curr_lcrit:
346 return TMP51X_SHUNT_CURRENT_L_LIMIT;
347 case hwmon_curr_crit:
348 return TMP51X_SHUNT_CURRENT_H_LIMIT;
349 }
350 break;
351 case hwmon_power:
352 switch (attr) {
353 case hwmon_power_input:
354 return TMP51X_POWER_RESULT;
355 case hwmon_power_crit_alarm:
356 return TMP51X_STATUS;
357 case hwmon_power_crit:
358 return TMP51X_POWER_LIMIT;
359 }
360 break;
361 default:
362 break;
363 }
364
365 return 0;
366}
367
368static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr,
369 int channel)
370{
371 switch (type) {
372 case hwmon_temp:
373 switch (attr) {
374 case hwmon_temp_crit_alarm:
375 return TMP51X_TEMP_CRIT_ALARM[channel];
376 }
377 break;
378 case hwmon_in:
379 switch (attr) {
380 case hwmon_in_lcrit_alarm:
381 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS;
382 case hwmon_in_crit_alarm:
383 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS;
384 }
385 break;
386 case hwmon_curr:
387 switch (attr) {
388 case hwmon_curr_lcrit_alarm:
389 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS;
390 case hwmon_curr_crit_alarm:
391 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS;
392 }
393 break;
394 case hwmon_power:
395 switch (attr) {
396 case hwmon_power_crit_alarm:
397 return TMP51X_POWER_LIMIT_POS;
398 }
399 break;
400 default:
401 break;
402 }
403
404 return 0;
405}
406
407static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type,
408 u32 attr, int channel, long *val)
409{
410 struct tmp51x_data *data = dev_get_drvdata(dev);
411 int ret;
412 u32 regval;
413 u8 pos = 0, reg = 0;
414
415 reg = tmp51x_get_reg(type, attr, channel);
416 if (reg == 0)
417 return -EOPNOTSUPP;
418
419 if (reg == TMP51X_STATUS)
420 pos = tmp51x_get_status_pos(type, attr, channel);
421
422 ret = regmap_read(data->regmap, reg, &regval);
423 if (ret < 0)
424 return ret;
425
426 return tmp51x_get_value(data, reg, pos, regval, val);
427}
428
429static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type,
430 u32 attr, int channel, long val)
431{
432 u8 reg = 0;
433
434 reg = tmp51x_get_reg(type, attr, channel);
435 if (reg == 0)
436 return -EOPNOTSUPP;
437
438 return tmp51x_set_value(dev_get_drvdata(dev), reg, val);
439}
440
441static umode_t tmp51x_is_visible(const void *_data,
442 enum hwmon_sensor_types type, u32 attr,
443 int channel)
444{
445 const struct tmp51x_data *data = _data;
446
447 switch (type) {
448 case hwmon_temp:
449 if (channel >= data->max_channels)
450 return 0;
451 switch (attr) {
452 case hwmon_temp_input:
453 case hwmon_temp_crit_alarm:
454 return 0444;
455 case hwmon_temp_crit:
456 return 0644;
457 case hwmon_temp_crit_hyst:
458 if (channel == 0)
459 return 0644;
460 return 0444;
461 }
462 break;
463 case hwmon_in:
464 switch (attr) {
465 case hwmon_in_input:
466 case hwmon_in_lcrit_alarm:
467 case hwmon_in_crit_alarm:
468 return 0444;
469 case hwmon_in_lcrit:
470 case hwmon_in_crit:
471 return 0644;
472 }
473 break;
474 case hwmon_curr:
475 if (!data->shunt_uohms)
476 return 0;
477
478 switch (attr) {
479 case hwmon_curr_input:
480 case hwmon_curr_lcrit_alarm:
481 case hwmon_curr_crit_alarm:
482 return 0444;
483 case hwmon_curr_lcrit:
484 case hwmon_curr_crit:
485 return 0644;
486 }
487 break;
488 case hwmon_power:
489 if (!data->shunt_uohms)
490 return 0;
491
492 switch (attr) {
493 case hwmon_power_input:
494 case hwmon_power_crit_alarm:
495 return 0444;
496 case hwmon_power_crit:
497 return 0644;
498 }
499 break;
500 default:
501 break;
502 }
503 return 0;
504}
505
506static const struct hwmon_channel_info * const tmp51x_info[] = {
507 HWMON_CHANNEL_INFO(temp,
508 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
509 HWMON_T_CRIT_HYST,
510 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
511 HWMON_T_CRIT_HYST,
512 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
513 HWMON_T_CRIT_HYST,
514 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
515 HWMON_T_CRIT_HYST),
516 HWMON_CHANNEL_INFO(in,
517 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM |
518 HWMON_I_CRIT | HWMON_I_CRIT_ALARM),
519 HWMON_CHANNEL_INFO(curr,
520 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM |
521 HWMON_C_CRIT | HWMON_C_CRIT_ALARM,
522 HWMON_C_INPUT),
523 HWMON_CHANNEL_INFO(power,
524 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM),
525 NULL
526};
527
528static const struct hwmon_ops tmp51x_hwmon_ops = {
529 .is_visible = tmp51x_is_visible,
530 .read = tmp51x_read,
531 .write = tmp51x_write,
532};
533
534static const struct hwmon_chip_info tmp51x_chip_info = {
535 .ops = &tmp51x_hwmon_ops,
536 .info = tmp51x_info,
537};
538
539/*
540 * Calibrate the tmp51x following the datasheet method
541 */
542static int tmp51x_calibrate(struct tmp51x_data *data)
543{
544 int vshunt_max = data->pga_gain * 40;
545 u64 max_curr_ma;
546 u32 div;
547
548 /*
549 * If shunt_uohms is equal to 0, the calibration should be set to 0.
550 * The consequence will be that the current and power measurement engine
551 * of the sensor will not work. Temperature and voltage sensing will
552 * continue to work.
553 */
554 if (data->shunt_uohms == 0)
555 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0);
556
557 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms);
558
559 /*
560 * Calculate the minimal bit resolution for the current and the power.
561 * Those values will be used during register interpretation.
562 */
563 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767);
564 data->pwr_lsb_uw = 20 * data->curr_lsb_ua;
565
566 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO);
567
568 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION,
569 DIV_ROUND_CLOSEST(40960, div));
570}
571
572/*
573 * Initialize the configuration and calibration registers.
574 */
575static int tmp51x_init(struct tmp51x_data *data)
576{
577 unsigned int regval;
578 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG,
579 data->shunt_config);
580 if (ret < 0)
581 return ret;
582
583 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config);
584 if (ret < 0)
585 return ret;
586
587 // nFactor configuration
588 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1,
589 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8);
590 if (ret < 0)
591 return ret;
592
593 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2,
594 data->nfactor[1] << 8);
595 if (ret < 0)
596 return ret;
597
598 if (data->max_channels == TMP513_MAX_CHANNELS) {
599 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3,
600 data->nfactor[2] << 8);
601 if (ret < 0)
602 return ret;
603 }
604
605 ret = tmp51x_calibrate(data);
606 if (ret < 0)
607 return ret;
608
609 // Read the status register before using as the datasheet propose
610 return regmap_read(data->regmap, TMP51X_STATUS, &regval);
611}
612
613static const struct i2c_device_id tmp51x_id[] = {
614 { .name = "tmp512", .driver_data = TMP512_MAX_CHANNELS },
615 { .name = "tmp513", .driver_data = TMP513_MAX_CHANNELS },
616 { }
617};
618MODULE_DEVICE_TABLE(i2c, tmp51x_id);
619
620static const struct of_device_id tmp51x_of_match[] = {
621 { .compatible = "ti,tmp512", .data = (void *)TMP512_MAX_CHANNELS },
622 { .compatible = "ti,tmp513", .data = (void *)TMP513_MAX_CHANNELS },
623 { }
624};
625MODULE_DEVICE_TABLE(of, tmp51x_of_match);
626
627static int tmp51x_vbus_range_to_reg(struct device *dev,
628 struct tmp51x_data *data)
629{
630 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) {
631 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK;
632 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) {
633 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK;
634 } else {
635 return dev_err_probe(dev, -EINVAL,
636 "ti,bus-range-microvolt is invalid: %u\n",
637 data->vbus_range_uvolt);
638 }
639 return 0;
640}
641
642static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data)
643{
644 if (data->pga_gain == 8) {
645 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK;
646 } else if (data->pga_gain == 4) {
647 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK;
648 } else if (data->pga_gain == 2) {
649 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK;
650 } else if (data->pga_gain == 1) {
651 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK;
652 } else {
653 return dev_err_probe(dev, -EINVAL,
654 "ti,pga-gain is invalid: %u\n", data->pga_gain);
655 }
656 return 0;
657}
658
659static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data)
660{
661 int ret;
662 u32 val;
663
664 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val);
665 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT;
666
667 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val);
668 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT;
669 ret = tmp51x_vbus_range_to_reg(dev, data);
670 if (ret < 0)
671 return ret;
672
673 ret = device_property_read_u32(dev, "ti,pga-gain", &val);
674 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT;
675 ret = tmp51x_pga_gain_to_reg(dev, data);
676 if (ret < 0)
677 return ret;
678
679 device_property_read_u32_array(dev, "ti,nfactor", data->nfactor,
680 data->max_channels - 1);
681
682 // Check if shunt value is compatible with pga-gain
683 if (data->shunt_uohms > data->pga_gain * 40 * MICRO) {
684 return dev_err_probe(dev, -EINVAL,
685 "shunt-resistor: %u too big for pga_gain: %u\n",
686 data->shunt_uohms, data->pga_gain);
687 }
688
689 return 0;
690}
691
692static void tmp51x_use_default(struct tmp51x_data *data)
693{
694 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT;
695 data->pga_gain = TMP51X_PGA_DEFAULT;
696 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT;
697}
698
699static int tmp51x_configure(struct device *dev, struct tmp51x_data *data)
700{
701 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT;
702 data->temp_config = TMP51X_TEMP_CONFIG_DEFAULT(data->max_channels);
703
704 if (dev->of_node)
705 return tmp51x_read_properties(dev, data);
706
707 tmp51x_use_default(data);
708
709 return 0;
710}
711
712static int tmp51x_probe(struct i2c_client *client)
713{
714 struct device *dev = &client->dev;
715 struct tmp51x_data *data;
716 struct device *hwmon_dev;
717 int ret;
718
719 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
720 if (!data)
721 return -ENOMEM;
722
723 data->max_channels = (uintptr_t)i2c_get_match_data(client);
724
725 ret = tmp51x_configure(dev, data);
726 if (ret < 0)
727 return dev_err_probe(dev, ret, "error configuring the device\n");
728
729 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config);
730 if (IS_ERR(data->regmap))
731 return dev_err_probe(dev, PTR_ERR(data->regmap),
732 "failed to allocate register map\n");
733
734 ret = tmp51x_init(data);
735 if (ret < 0)
736 return dev_err_probe(dev, ret, "error configuring the device\n");
737
738 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
739 data,
740 &tmp51x_chip_info,
741 NULL);
742 if (IS_ERR(hwmon_dev))
743 return PTR_ERR(hwmon_dev);
744
745 dev_dbg(dev, "power monitor %s\n", client->name);
746
747 return 0;
748}
749
750static struct i2c_driver tmp51x_driver = {
751 .driver = {
752 .name = "tmp51x",
753 .of_match_table = tmp51x_of_match,
754 },
755 .probe = tmp51x_probe,
756 .id_table = tmp51x_id,
757};
758
759module_i2c_driver(tmp51x_driver);
760
761MODULE_AUTHOR("Eric Tremblay <[email protected]>");
762MODULE_DESCRIPTION("tmp51x driver");
763MODULE_LICENSE("GPL");