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 <etremblay@distech-controls.com>
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 #define TMP512_TEMP_CONFIG_DEFAULT 0xBF80
82 #define TMP513_TEMP_CONFIG_DEFAULT 0xFF80
83
84 // Mask and shift
85 #define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800
86 #define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000
87 #define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800
88 #define CURRENT_SENSE_VOLTAGE_40_MASK 0
89
90 #define TMP51X_BUS_VOLTAGE_MASK 0x2000
91 #define TMP51X_NFACTOR_MASK 0xFF00
92 #define TMP51X_HYST_MASK 0x00FF
93
94 #define TMP51X_BUS_VOLTAGE_SHIFT 3
95 #define TMP51X_TEMP_SHIFT 3
96
97 // Alarms
98 #define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15
99 #define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14
100 #define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13
101 #define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12
102 #define TMP51X_POWER_LIMIT_POS 11
103 #define TMP51X_LOCAL_TEMP_LIMIT_POS 10
104 #define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9
105 #define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8
106 #define TMP513_REMOTE_TEMP_LIMIT_3_POS 7
107
108 #define TMP51X_VBUS_RANGE_32V (32 * MICRO)
109 #define TMP51X_VBUS_RANGE_16V (16 * MICRO)
110
111 // Max and Min value
112 #define MAX_BUS_VOLTAGE_32_LIMIT 32764
113 #define MAX_BUS_VOLTAGE_16_LIMIT 16382
114
115 // Max possible value is -256 to +256 but datasheet indicated -40 to 125.
116 #define MAX_TEMP_LIMIT 125000
117 #define MIN_TEMP_LIMIT -40000
118
119 #define MAX_TEMP_HYST 127500
120
121 static const u8 TMP51X_TEMP_INPUT[4] = {
122 TMP51X_LOCAL_TEMP_RESULT,
123 TMP51X_REMOTE_TEMP_RESULT_1,
124 TMP51X_REMOTE_TEMP_RESULT_2,
125 TMP513_REMOTE_TEMP_RESULT_3
126 };
127
128 static const u8 TMP51X_TEMP_CRIT[4] = {
129 TMP51X_LOCAL_TEMP_LIMIT,
130 TMP51X_REMOTE_TEMP_LIMIT_1,
131 TMP51X_REMOTE_TEMP_LIMIT_2,
132 TMP513_REMOTE_TEMP_LIMIT_3
133 };
134
135 static const u8 TMP51X_TEMP_CRIT_ALARM[4] = {
136 TMP51X_LOCAL_TEMP_LIMIT_POS,
137 TMP51X_REMOTE_TEMP_LIMIT_1_POS,
138 TMP51X_REMOTE_TEMP_LIMIT_2_POS,
139 TMP513_REMOTE_TEMP_LIMIT_3_POS
140 };
141
142 static const u8 TMP51X_TEMP_CRIT_HYST[4] = {
143 TMP51X_N_FACTOR_AND_HYST_1,
144 TMP51X_N_FACTOR_AND_HYST_1,
145 TMP51X_N_FACTOR_AND_HYST_1,
146 TMP51X_N_FACTOR_AND_HYST_1
147 };
148
149 static const u8 TMP51X_CURR_INPUT[2] = {
150 TMP51X_SHUNT_CURRENT_RESULT,
151 TMP51X_BUS_CURRENT_RESULT
152 };
153
154 static struct regmap_config tmp51x_regmap_config = {
155 .reg_bits = 8,
156 .val_bits = 16,
157 .max_register = TMP51X_MAX_REGISTER_ADDR,
158 };
159
160 enum tmp51x_ids {
161 tmp512, tmp513
162 };
163
164 struct tmp51x_data {
165 u16 shunt_config;
166 u16 pga_gain;
167 u32 vbus_range_uvolt;
168
169 u16 temp_config;
170 u32 nfactor[3];
171
172 u32 shunt_uohms;
173
174 u32 curr_lsb_ua;
175 u32 pwr_lsb_uw;
176
177 enum tmp51x_ids id;
178 struct regmap *regmap;
179 };
180
181 // Set the shift based on the gain: 8 -> 1, 4 -> 2, 2 -> 3, 1 -> 4
tmp51x_get_pga_shift(struct tmp51x_data * data)182 static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data)
183 {
184 return 5 - ffs(data->pga_gain);
185 }
186
tmp51x_get_value(struct tmp51x_data * data,u8 reg,u8 pos,unsigned int regval,long * val)187 static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos,
188 unsigned int regval, long *val)
189 {
190 switch (reg) {
191 case TMP51X_STATUS:
192 *val = (regval >> pos) & 1;
193 break;
194 case TMP51X_SHUNT_CURRENT_RESULT:
195 case TMP51X_SHUNT_CURRENT_H_LIMIT:
196 case TMP51X_SHUNT_CURRENT_L_LIMIT:
197 /*
198 * The valus is read in voltage in the chip but reported as
199 * current to the user.
200 * 2's complement number shifted by one to four depending
201 * on the pga gain setting. 1lsb = 10uV
202 */
203 *val = sign_extend32(regval,
204 reg == TMP51X_SHUNT_CURRENT_RESULT ?
205 16 - tmp51x_get_pga_shift(data) : 15);
206 *val = DIV_ROUND_CLOSEST(*val * 10 * MILLI, data->shunt_uohms);
207 break;
208 case TMP51X_BUS_VOLTAGE_RESULT:
209 case TMP51X_BUS_VOLTAGE_H_LIMIT:
210 case TMP51X_BUS_VOLTAGE_L_LIMIT:
211 // 1lsb = 4mV
212 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4;
213 break;
214 case TMP51X_POWER_RESULT:
215 case TMP51X_POWER_LIMIT:
216 // Power = (current * BusVoltage) / 5000
217 *val = regval * data->pwr_lsb_uw;
218 break;
219 case TMP51X_BUS_CURRENT_RESULT:
220 // Current = (ShuntVoltage * CalibrationRegister) / 4096
221 *val = sign_extend32(regval, 15) * (long)data->curr_lsb_ua;
222 *val = DIV_ROUND_CLOSEST(*val, MILLI);
223 break;
224 case TMP51X_LOCAL_TEMP_RESULT:
225 case TMP51X_REMOTE_TEMP_RESULT_1:
226 case TMP51X_REMOTE_TEMP_RESULT_2:
227 case TMP513_REMOTE_TEMP_RESULT_3:
228 case TMP51X_LOCAL_TEMP_LIMIT:
229 case TMP51X_REMOTE_TEMP_LIMIT_1:
230 case TMP51X_REMOTE_TEMP_LIMIT_2:
231 case TMP513_REMOTE_TEMP_LIMIT_3:
232 // 1lsb = 0.0625 degrees centigrade
233 *val = sign_extend32(regval, 15) >> TMP51X_TEMP_SHIFT;
234 *val = DIV_ROUND_CLOSEST(*val * 625, 10);
235 break;
236 case TMP51X_N_FACTOR_AND_HYST_1:
237 // 1lsb = 0.5 degrees centigrade
238 *val = (regval & TMP51X_HYST_MASK) * 500;
239 break;
240 default:
241 // Programmer goofed
242 WARN_ON_ONCE(1);
243 *val = 0;
244 return -EOPNOTSUPP;
245 }
246
247 return 0;
248 }
249
tmp51x_set_value(struct tmp51x_data * data,u8 reg,long val)250 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val)
251 {
252 int regval, max_val;
253 u32 mask = 0;
254
255 switch (reg) {
256 case TMP51X_SHUNT_CURRENT_H_LIMIT:
257 case TMP51X_SHUNT_CURRENT_L_LIMIT:
258 /*
259 * The user enter current value and we convert it to
260 * voltage. 1lsb = 10uV
261 */
262 val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10 * MILLI);
263 max_val = U16_MAX >> tmp51x_get_pga_shift(data);
264 regval = clamp_val(val, -max_val, max_val);
265 break;
266 case TMP51X_BUS_VOLTAGE_H_LIMIT:
267 case TMP51X_BUS_VOLTAGE_L_LIMIT:
268 // 1lsb = 4mV
269 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ?
270 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT;
271
272 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val);
273 regval = val << TMP51X_BUS_VOLTAGE_SHIFT;
274 break;
275 case TMP51X_POWER_LIMIT:
276 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0,
277 U16_MAX);
278 break;
279 case TMP51X_LOCAL_TEMP_LIMIT:
280 case TMP51X_REMOTE_TEMP_LIMIT_1:
281 case TMP51X_REMOTE_TEMP_LIMIT_2:
282 case TMP513_REMOTE_TEMP_LIMIT_3:
283 // 1lsb = 0.0625 degrees centigrade
284 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT);
285 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT;
286 break;
287 case TMP51X_N_FACTOR_AND_HYST_1:
288 // 1lsb = 0.5 degrees centigrade
289 val = clamp_val(val, 0, MAX_TEMP_HYST);
290 regval = DIV_ROUND_CLOSEST(val, 500);
291 mask = TMP51X_HYST_MASK;
292 break;
293 default:
294 // Programmer goofed
295 WARN_ON_ONCE(1);
296 return -EOPNOTSUPP;
297 }
298
299 if (mask == 0)
300 return regmap_write(data->regmap, reg, regval);
301 else
302 return regmap_update_bits(data->regmap, reg, mask, regval);
303 }
304
tmp51x_get_reg(enum hwmon_sensor_types type,u32 attr,int channel)305 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel)
306 {
307 switch (type) {
308 case hwmon_temp:
309 switch (attr) {
310 case hwmon_temp_input:
311 return TMP51X_TEMP_INPUT[channel];
312 case hwmon_temp_crit_alarm:
313 return TMP51X_STATUS;
314 case hwmon_temp_crit:
315 return TMP51X_TEMP_CRIT[channel];
316 case hwmon_temp_crit_hyst:
317 return TMP51X_TEMP_CRIT_HYST[channel];
318 }
319 break;
320 case hwmon_in:
321 switch (attr) {
322 case hwmon_in_input:
323 return TMP51X_BUS_VOLTAGE_RESULT;
324 case hwmon_in_lcrit_alarm:
325 case hwmon_in_crit_alarm:
326 return TMP51X_STATUS;
327 case hwmon_in_lcrit:
328 return TMP51X_BUS_VOLTAGE_L_LIMIT;
329 case hwmon_in_crit:
330 return TMP51X_BUS_VOLTAGE_H_LIMIT;
331 }
332 break;
333 case hwmon_curr:
334 switch (attr) {
335 case hwmon_curr_input:
336 return TMP51X_CURR_INPUT[channel];
337 case hwmon_curr_lcrit_alarm:
338 case hwmon_curr_crit_alarm:
339 return TMP51X_STATUS;
340 case hwmon_curr_lcrit:
341 return TMP51X_SHUNT_CURRENT_L_LIMIT;
342 case hwmon_curr_crit:
343 return TMP51X_SHUNT_CURRENT_H_LIMIT;
344 }
345 break;
346 case hwmon_power:
347 switch (attr) {
348 case hwmon_power_input:
349 return TMP51X_POWER_RESULT;
350 case hwmon_power_crit_alarm:
351 return TMP51X_STATUS;
352 case hwmon_power_crit:
353 return TMP51X_POWER_LIMIT;
354 }
355 break;
356 default:
357 break;
358 }
359
360 return 0;
361 }
362
tmp51x_get_status_pos(enum hwmon_sensor_types type,u32 attr,int channel)363 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr,
364 int channel)
365 {
366 switch (type) {
367 case hwmon_temp:
368 switch (attr) {
369 case hwmon_temp_crit_alarm:
370 return TMP51X_TEMP_CRIT_ALARM[channel];
371 }
372 break;
373 case hwmon_in:
374 switch (attr) {
375 case hwmon_in_lcrit_alarm:
376 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS;
377 case hwmon_in_crit_alarm:
378 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS;
379 }
380 break;
381 case hwmon_curr:
382 switch (attr) {
383 case hwmon_curr_lcrit_alarm:
384 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS;
385 case hwmon_curr_crit_alarm:
386 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS;
387 }
388 break;
389 case hwmon_power:
390 switch (attr) {
391 case hwmon_power_crit_alarm:
392 return TMP51X_POWER_LIMIT_POS;
393 }
394 break;
395 default:
396 break;
397 }
398
399 return 0;
400 }
401
tmp51x_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)402 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type,
403 u32 attr, int channel, long *val)
404 {
405 struct tmp51x_data *data = dev_get_drvdata(dev);
406 int ret;
407 u32 regval;
408 u8 pos = 0, reg = 0;
409
410 reg = tmp51x_get_reg(type, attr, channel);
411 if (reg == 0)
412 return -EOPNOTSUPP;
413
414 if (reg == TMP51X_STATUS)
415 pos = tmp51x_get_status_pos(type, attr, channel);
416
417 ret = regmap_read(data->regmap, reg, ®val);
418 if (ret < 0)
419 return ret;
420
421 return tmp51x_get_value(data, reg, pos, regval, val);
422 }
423
tmp51x_write(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long val)424 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type,
425 u32 attr, int channel, long val)
426 {
427 u8 reg = 0;
428
429 reg = tmp51x_get_reg(type, attr, channel);
430 if (reg == 0)
431 return -EOPNOTSUPP;
432
433 return tmp51x_set_value(dev_get_drvdata(dev), reg, val);
434 }
435
tmp51x_is_visible(const void * _data,enum hwmon_sensor_types type,u32 attr,int channel)436 static umode_t tmp51x_is_visible(const void *_data,
437 enum hwmon_sensor_types type, u32 attr,
438 int channel)
439 {
440 const struct tmp51x_data *data = _data;
441
442 switch (type) {
443 case hwmon_temp:
444 if (data->id == tmp512 && channel == 3)
445 return 0;
446 switch (attr) {
447 case hwmon_temp_input:
448 case hwmon_temp_crit_alarm:
449 return 0444;
450 case hwmon_temp_crit:
451 return 0644;
452 case hwmon_temp_crit_hyst:
453 if (channel == 0)
454 return 0644;
455 return 0444;
456 }
457 break;
458 case hwmon_in:
459 switch (attr) {
460 case hwmon_in_input:
461 case hwmon_in_lcrit_alarm:
462 case hwmon_in_crit_alarm:
463 return 0444;
464 case hwmon_in_lcrit:
465 case hwmon_in_crit:
466 return 0644;
467 }
468 break;
469 case hwmon_curr:
470 if (!data->shunt_uohms)
471 return 0;
472
473 switch (attr) {
474 case hwmon_curr_input:
475 case hwmon_curr_lcrit_alarm:
476 case hwmon_curr_crit_alarm:
477 return 0444;
478 case hwmon_curr_lcrit:
479 case hwmon_curr_crit:
480 return 0644;
481 }
482 break;
483 case hwmon_power:
484 if (!data->shunt_uohms)
485 return 0;
486
487 switch (attr) {
488 case hwmon_power_input:
489 case hwmon_power_crit_alarm:
490 return 0444;
491 case hwmon_power_crit:
492 return 0644;
493 }
494 break;
495 default:
496 break;
497 }
498 return 0;
499 }
500
501 static const struct hwmon_channel_info * const tmp51x_info[] = {
502 HWMON_CHANNEL_INFO(temp,
503 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
504 HWMON_T_CRIT_HYST,
505 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
506 HWMON_T_CRIT_HYST,
507 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
508 HWMON_T_CRIT_HYST,
509 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
510 HWMON_T_CRIT_HYST),
511 HWMON_CHANNEL_INFO(in,
512 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM |
513 HWMON_I_CRIT | HWMON_I_CRIT_ALARM),
514 HWMON_CHANNEL_INFO(curr,
515 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM |
516 HWMON_C_CRIT | HWMON_C_CRIT_ALARM,
517 HWMON_C_INPUT),
518 HWMON_CHANNEL_INFO(power,
519 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM),
520 NULL
521 };
522
523 static const struct hwmon_ops tmp51x_hwmon_ops = {
524 .is_visible = tmp51x_is_visible,
525 .read = tmp51x_read,
526 .write = tmp51x_write,
527 };
528
529 static const struct hwmon_chip_info tmp51x_chip_info = {
530 .ops = &tmp51x_hwmon_ops,
531 .info = tmp51x_info,
532 };
533
534 /*
535 * Calibrate the tmp51x following the datasheet method
536 */
tmp51x_calibrate(struct tmp51x_data * data)537 static int tmp51x_calibrate(struct tmp51x_data *data)
538 {
539 int vshunt_max = data->pga_gain * 40;
540 u64 max_curr_ma;
541 u32 div;
542
543 /*
544 * If shunt_uohms is equal to 0, the calibration should be set to 0.
545 * The consequence will be that the current and power measurement engine
546 * of the sensor will not work. Temperature and voltage sensing will
547 * continue to work.
548 */
549 if (data->shunt_uohms == 0)
550 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0);
551
552 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms);
553
554 /*
555 * Calculate the minimal bit resolution for the current and the power.
556 * Those values will be used during register interpretation.
557 */
558 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767);
559 data->pwr_lsb_uw = 20 * data->curr_lsb_ua;
560
561 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO);
562
563 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION,
564 DIV_ROUND_CLOSEST(40960, div));
565 }
566
567 /*
568 * Initialize the configuration and calibration registers.
569 */
tmp51x_init(struct tmp51x_data * data)570 static int tmp51x_init(struct tmp51x_data *data)
571 {
572 unsigned int regval;
573 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG,
574 data->shunt_config);
575 if (ret < 0)
576 return ret;
577
578 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config);
579 if (ret < 0)
580 return ret;
581
582 // nFactor configuration
583 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1,
584 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8);
585 if (ret < 0)
586 return ret;
587
588 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2,
589 data->nfactor[1] << 8);
590 if (ret < 0)
591 return ret;
592
593 if (data->id == tmp513) {
594 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3,
595 data->nfactor[2] << 8);
596 if (ret < 0)
597 return ret;
598 }
599
600 ret = tmp51x_calibrate(data);
601 if (ret < 0)
602 return ret;
603
604 // Read the status register before using as the datasheet propose
605 return regmap_read(data->regmap, TMP51X_STATUS, ®val);
606 }
607
608 static const struct i2c_device_id tmp51x_id[] = {
609 { "tmp512", tmp512 },
610 { "tmp513", tmp513 },
611 { }
612 };
613 MODULE_DEVICE_TABLE(i2c, tmp51x_id);
614
615 static const struct of_device_id tmp51x_of_match[] = {
616 {
617 .compatible = "ti,tmp512",
618 .data = (void *)tmp512
619 },
620 {
621 .compatible = "ti,tmp513",
622 .data = (void *)tmp513
623 },
624 { },
625 };
626 MODULE_DEVICE_TABLE(of, tmp51x_of_match);
627
tmp51x_vbus_range_to_reg(struct device * dev,struct tmp51x_data * data)628 static int tmp51x_vbus_range_to_reg(struct device *dev,
629 struct tmp51x_data *data)
630 {
631 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) {
632 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK;
633 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) {
634 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK;
635 } else {
636 return dev_err_probe(dev, -EINVAL,
637 "ti,bus-range-microvolt is invalid: %u\n",
638 data->vbus_range_uvolt);
639 }
640 return 0;
641 }
642
tmp51x_pga_gain_to_reg(struct device * dev,struct tmp51x_data * data)643 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data)
644 {
645 if (data->pga_gain == 8) {
646 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK;
647 } else if (data->pga_gain == 4) {
648 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK;
649 } else if (data->pga_gain == 2) {
650 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK;
651 } else if (data->pga_gain == 1) {
652 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK;
653 } else {
654 return dev_err_probe(dev, -EINVAL,
655 "ti,pga-gain is invalid: %u\n", data->pga_gain);
656 }
657 return 0;
658 }
659
tmp51x_read_properties(struct device * dev,struct tmp51x_data * data)660 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data)
661 {
662 int ret;
663 u32 nfactor[3];
664 u32 val;
665
666 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val);
667 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT;
668
669 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val);
670 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT;
671 ret = tmp51x_vbus_range_to_reg(dev, data);
672 if (ret < 0)
673 return ret;
674
675 ret = device_property_read_u32(dev, "ti,pga-gain", &val);
676 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT;
677 ret = tmp51x_pga_gain_to_reg(dev, data);
678 if (ret < 0)
679 return ret;
680
681 ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor,
682 (data->id == tmp513) ? 3 : 2);
683 if (ret >= 0)
684 memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2);
685
686 // Check if shunt value is compatible with pga-gain
687 if (data->shunt_uohms > data->pga_gain * 40 * MICRO) {
688 return dev_err_probe(dev, -EINVAL,
689 "shunt-resistor: %u too big for pga_gain: %u\n",
690 data->shunt_uohms, data->pga_gain);
691 }
692
693 return 0;
694 }
695
tmp51x_use_default(struct tmp51x_data * data)696 static void tmp51x_use_default(struct tmp51x_data *data)
697 {
698 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT;
699 data->pga_gain = TMP51X_PGA_DEFAULT;
700 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT;
701 }
702
tmp51x_configure(struct device * dev,struct tmp51x_data * data)703 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data)
704 {
705 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT;
706 data->temp_config = (data->id == tmp513) ?
707 TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT;
708
709 if (dev->of_node)
710 return tmp51x_read_properties(dev, data);
711
712 tmp51x_use_default(data);
713
714 return 0;
715 }
716
tmp51x_probe(struct i2c_client * client)717 static int tmp51x_probe(struct i2c_client *client)
718 {
719 struct device *dev = &client->dev;
720 struct tmp51x_data *data;
721 struct device *hwmon_dev;
722 int ret;
723
724 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
725 if (!data)
726 return -ENOMEM;
727
728 data->id = (uintptr_t)i2c_get_match_data(client);
729
730 ret = tmp51x_configure(dev, data);
731 if (ret < 0)
732 return dev_err_probe(dev, ret, "error configuring the device\n");
733
734 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config);
735 if (IS_ERR(data->regmap))
736 return dev_err_probe(dev, PTR_ERR(data->regmap),
737 "failed to allocate register map\n");
738
739 ret = tmp51x_init(data);
740 if (ret < 0)
741 return dev_err_probe(dev, ret, "error configuring the device\n");
742
743 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
744 data,
745 &tmp51x_chip_info,
746 NULL);
747 if (IS_ERR(hwmon_dev))
748 return PTR_ERR(hwmon_dev);
749
750 dev_dbg(dev, "power monitor %s\n", client->name);
751
752 return 0;
753 }
754
755 static struct i2c_driver tmp51x_driver = {
756 .driver = {
757 .name = "tmp51x",
758 .of_match_table = tmp51x_of_match,
759 },
760 .probe = tmp51x_probe,
761 .id_table = tmp51x_id,
762 };
763
764 module_i2c_driver(tmp51x_driver);
765
766 MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>");
767 MODULE_DESCRIPTION("tmp51x driver");
768 MODULE_LICENSE("GPL");
769