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 // 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
129 static 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
136 static 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
143 static 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
150 static 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
157 static const u8 TMP51X_CURR_INPUT[2] = {
158 TMP51X_SHUNT_CURRENT_RESULT,
159 TMP51X_BUS_CURRENT_RESULT
160 };
161
162 static const struct regmap_config tmp51x_regmap_config = {
163 .reg_bits = 8,
164 .val_bits = 16,
165 .max_register = TMP51X_MAX_REGISTER_ADDR,
166 };
167
168 struct 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
tmp51x_get_pga_shift(struct tmp51x_data * data)186 static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data)
187 {
188 return 5 - ffs(data->pga_gain);
189 }
190
tmp51x_get_value(struct tmp51x_data * data,u8 reg,u8 pos,unsigned int regval,long * val)191 static 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 * MILLI, data->shunt_uohms);
211 break;
212 case TMP51X_BUS_VOLTAGE_RESULT:
213 case TMP51X_BUS_VOLTAGE_H_LIMIT:
214 case TMP51X_BUS_VOLTAGE_L_LIMIT:
215 // 1lsb = 4mV
216 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4;
217 break;
218 case TMP51X_POWER_RESULT:
219 case TMP51X_POWER_LIMIT:
220 // Power = (current * BusVoltage) / 5000
221 *val = regval * data->pwr_lsb_uw;
222 break;
223 case TMP51X_BUS_CURRENT_RESULT:
224 // Current = (ShuntVoltage * CalibrationRegister) / 4096
225 *val = sign_extend32(regval, 15) * (long)data->curr_lsb_ua;
226 *val = DIV_ROUND_CLOSEST(*val, MILLI);
227 break;
228 case TMP51X_LOCAL_TEMP_RESULT:
229 case TMP51X_REMOTE_TEMP_RESULT_1:
230 case TMP51X_REMOTE_TEMP_RESULT_2:
231 case TMP513_REMOTE_TEMP_RESULT_3:
232 case TMP51X_LOCAL_TEMP_LIMIT:
233 case TMP51X_REMOTE_TEMP_LIMIT_1:
234 case TMP51X_REMOTE_TEMP_LIMIT_2:
235 case TMP513_REMOTE_TEMP_LIMIT_3:
236 // 1lsb = 0.0625 degrees centigrade
237 *val = sign_extend32(regval, 15) >> TMP51X_TEMP_SHIFT;
238 *val = DIV_ROUND_CLOSEST(*val * 625, 10);
239 break;
240 case TMP51X_N_FACTOR_AND_HYST_1:
241 // 1lsb = 0.5 degrees centigrade
242 *val = (regval & TMP51X_HYST_MASK) * 500;
243 break;
244 default:
245 // Programmer goofed
246 WARN_ON_ONCE(1);
247 *val = 0;
248 return -EOPNOTSUPP;
249 }
250
251 return 0;
252 }
253
tmp51x_set_value(struct tmp51x_data * data,u8 reg,long val)254 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val)
255 {
256 int regval, max_val;
257 u32 mask = 0;
258
259 switch (reg) {
260 case TMP51X_SHUNT_CURRENT_H_LIMIT:
261 case TMP51X_SHUNT_CURRENT_L_LIMIT:
262 /*
263 * The user enter current value and we convert it to
264 * voltage. 1lsb = 10uV
265 */
266 val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10 * MILLI);
267 max_val = U16_MAX >> tmp51x_get_pga_shift(data);
268 regval = clamp_val(val, -max_val, max_val);
269 break;
270 case TMP51X_BUS_VOLTAGE_H_LIMIT:
271 case TMP51X_BUS_VOLTAGE_L_LIMIT:
272 // 1lsb = 4mV
273 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ?
274 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT;
275
276 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val);
277 regval = val << TMP51X_BUS_VOLTAGE_SHIFT;
278 break;
279 case TMP51X_POWER_LIMIT:
280 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0,
281 U16_MAX);
282 break;
283 case TMP51X_LOCAL_TEMP_LIMIT:
284 case TMP51X_REMOTE_TEMP_LIMIT_1:
285 case TMP51X_REMOTE_TEMP_LIMIT_2:
286 case TMP513_REMOTE_TEMP_LIMIT_3:
287 // 1lsb = 0.0625 degrees centigrade
288 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT);
289 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT;
290 break;
291 case TMP51X_N_FACTOR_AND_HYST_1:
292 // 1lsb = 0.5 degrees centigrade
293 val = clamp_val(val, 0, MAX_TEMP_HYST);
294 regval = DIV_ROUND_CLOSEST(val, 500);
295 mask = TMP51X_HYST_MASK;
296 break;
297 default:
298 // Programmer goofed
299 WARN_ON_ONCE(1);
300 return -EOPNOTSUPP;
301 }
302
303 if (mask == 0)
304 return regmap_write(data->regmap, reg, regval);
305 else
306 return regmap_update_bits(data->regmap, reg, mask, regval);
307 }
308
tmp51x_get_reg(enum hwmon_sensor_types type,u32 attr,int channel)309 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel)
310 {
311 switch (type) {
312 case hwmon_temp:
313 switch (attr) {
314 case hwmon_temp_input:
315 return TMP51X_TEMP_INPUT[channel];
316 case hwmon_temp_crit_alarm:
317 return TMP51X_STATUS;
318 case hwmon_temp_crit:
319 return TMP51X_TEMP_CRIT[channel];
320 case hwmon_temp_crit_hyst:
321 return TMP51X_TEMP_CRIT_HYST[channel];
322 }
323 break;
324 case hwmon_in:
325 switch (attr) {
326 case hwmon_in_input:
327 return TMP51X_BUS_VOLTAGE_RESULT;
328 case hwmon_in_lcrit_alarm:
329 case hwmon_in_crit_alarm:
330 return TMP51X_STATUS;
331 case hwmon_in_lcrit:
332 return TMP51X_BUS_VOLTAGE_L_LIMIT;
333 case hwmon_in_crit:
334 return TMP51X_BUS_VOLTAGE_H_LIMIT;
335 }
336 break;
337 case hwmon_curr:
338 switch (attr) {
339 case hwmon_curr_input:
340 return TMP51X_CURR_INPUT[channel];
341 case hwmon_curr_lcrit_alarm:
342 case hwmon_curr_crit_alarm:
343 return TMP51X_STATUS;
344 case hwmon_curr_lcrit:
345 return TMP51X_SHUNT_CURRENT_L_LIMIT;
346 case hwmon_curr_crit:
347 return TMP51X_SHUNT_CURRENT_H_LIMIT;
348 }
349 break;
350 case hwmon_power:
351 switch (attr) {
352 case hwmon_power_input:
353 return TMP51X_POWER_RESULT;
354 case hwmon_power_crit_alarm:
355 return TMP51X_STATUS;
356 case hwmon_power_crit:
357 return TMP51X_POWER_LIMIT;
358 }
359 break;
360 default:
361 break;
362 }
363
364 return 0;
365 }
366
tmp51x_get_status_pos(enum hwmon_sensor_types type,u32 attr,int channel)367 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr,
368 int channel)
369 {
370 switch (type) {
371 case hwmon_temp:
372 switch (attr) {
373 case hwmon_temp_crit_alarm:
374 return TMP51X_TEMP_CRIT_ALARM[channel];
375 }
376 break;
377 case hwmon_in:
378 switch (attr) {
379 case hwmon_in_lcrit_alarm:
380 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS;
381 case hwmon_in_crit_alarm:
382 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS;
383 }
384 break;
385 case hwmon_curr:
386 switch (attr) {
387 case hwmon_curr_lcrit_alarm:
388 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS;
389 case hwmon_curr_crit_alarm:
390 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS;
391 }
392 break;
393 case hwmon_power:
394 switch (attr) {
395 case hwmon_power_crit_alarm:
396 return TMP51X_POWER_LIMIT_POS;
397 }
398 break;
399 default:
400 break;
401 }
402
403 return 0;
404 }
405
tmp51x_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)406 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type,
407 u32 attr, int channel, long *val)
408 {
409 struct tmp51x_data *data = dev_get_drvdata(dev);
410 int ret;
411 u32 regval;
412 u8 pos = 0, reg = 0;
413
414 reg = tmp51x_get_reg(type, attr, channel);
415 if (reg == 0)
416 return -EOPNOTSUPP;
417
418 if (reg == TMP51X_STATUS)
419 pos = tmp51x_get_status_pos(type, attr, channel);
420
421 ret = regmap_read(data->regmap, reg, ®val);
422 if (ret < 0)
423 return ret;
424
425 return tmp51x_get_value(data, reg, pos, regval, val);
426 }
427
tmp51x_write(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long val)428 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type,
429 u32 attr, int channel, long val)
430 {
431 u8 reg = 0;
432
433 reg = tmp51x_get_reg(type, attr, channel);
434 if (reg == 0)
435 return -EOPNOTSUPP;
436
437 return tmp51x_set_value(dev_get_drvdata(dev), reg, val);
438 }
439
tmp51x_is_visible(const void * _data,enum hwmon_sensor_types type,u32 attr,int channel)440 static umode_t tmp51x_is_visible(const void *_data,
441 enum hwmon_sensor_types type, u32 attr,
442 int channel)
443 {
444 const struct tmp51x_data *data = _data;
445
446 switch (type) {
447 case hwmon_temp:
448 if (channel >= data->max_channels)
449 return 0;
450 switch (attr) {
451 case hwmon_temp_input:
452 case hwmon_temp_crit_alarm:
453 return 0444;
454 case hwmon_temp_crit:
455 return 0644;
456 case hwmon_temp_crit_hyst:
457 if (channel == 0)
458 return 0644;
459 return 0444;
460 }
461 break;
462 case hwmon_in:
463 switch (attr) {
464 case hwmon_in_input:
465 case hwmon_in_lcrit_alarm:
466 case hwmon_in_crit_alarm:
467 return 0444;
468 case hwmon_in_lcrit:
469 case hwmon_in_crit:
470 return 0644;
471 }
472 break;
473 case hwmon_curr:
474 if (!data->shunt_uohms)
475 return 0;
476
477 switch (attr) {
478 case hwmon_curr_input:
479 case hwmon_curr_lcrit_alarm:
480 case hwmon_curr_crit_alarm:
481 return 0444;
482 case hwmon_curr_lcrit:
483 case hwmon_curr_crit:
484 return 0644;
485 }
486 break;
487 case hwmon_power:
488 if (!data->shunt_uohms)
489 return 0;
490
491 switch (attr) {
492 case hwmon_power_input:
493 case hwmon_power_crit_alarm:
494 return 0444;
495 case hwmon_power_crit:
496 return 0644;
497 }
498 break;
499 default:
500 break;
501 }
502 return 0;
503 }
504
505 static const struct hwmon_channel_info * const tmp51x_info[] = {
506 HWMON_CHANNEL_INFO(temp,
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_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
512 HWMON_T_CRIT_HYST,
513 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
514 HWMON_T_CRIT_HYST),
515 HWMON_CHANNEL_INFO(in,
516 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM |
517 HWMON_I_CRIT | HWMON_I_CRIT_ALARM),
518 HWMON_CHANNEL_INFO(curr,
519 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM |
520 HWMON_C_CRIT | HWMON_C_CRIT_ALARM,
521 HWMON_C_INPUT),
522 HWMON_CHANNEL_INFO(power,
523 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM),
524 NULL
525 };
526
527 static const struct hwmon_ops tmp51x_hwmon_ops = {
528 .is_visible = tmp51x_is_visible,
529 .read = tmp51x_read,
530 .write = tmp51x_write,
531 };
532
533 static const struct hwmon_chip_info tmp51x_chip_info = {
534 .ops = &tmp51x_hwmon_ops,
535 .info = tmp51x_info,
536 };
537
538 /*
539 * Calibrate the tmp51x following the datasheet method
540 */
tmp51x_calibrate(struct tmp51x_data * data)541 static int tmp51x_calibrate(struct tmp51x_data *data)
542 {
543 int vshunt_max = data->pga_gain * 40;
544 u64 max_curr_ma;
545 u32 div;
546
547 /*
548 * If shunt_uohms is equal to 0, the calibration should be set to 0.
549 * The consequence will be that the current and power measurement engine
550 * of the sensor will not work. Temperature and voltage sensing will
551 * continue to work.
552 */
553 if (data->shunt_uohms == 0)
554 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0);
555
556 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms);
557
558 /*
559 * Calculate the minimal bit resolution for the current and the power.
560 * Those values will be used during register interpretation.
561 */
562 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767);
563 data->pwr_lsb_uw = 20 * data->curr_lsb_ua;
564
565 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO);
566
567 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION,
568 DIV_ROUND_CLOSEST(40960, div));
569 }
570
571 /*
572 * Initialize the configuration and calibration registers.
573 */
tmp51x_init(struct tmp51x_data * data)574 static int tmp51x_init(struct tmp51x_data *data)
575 {
576 unsigned int regval;
577 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG,
578 data->shunt_config);
579 if (ret < 0)
580 return ret;
581
582 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config);
583 if (ret < 0)
584 return ret;
585
586 // nFactor configuration
587 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1,
588 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8);
589 if (ret < 0)
590 return ret;
591
592 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2,
593 data->nfactor[1] << 8);
594 if (ret < 0)
595 return ret;
596
597 if (data->max_channels == TMP513_MAX_CHANNELS) {
598 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3,
599 data->nfactor[2] << 8);
600 if (ret < 0)
601 return ret;
602 }
603
604 ret = tmp51x_calibrate(data);
605 if (ret < 0)
606 return ret;
607
608 // Read the status register before using as the datasheet propose
609 return regmap_read(data->regmap, TMP51X_STATUS, ®val);
610 }
611
612 static const struct i2c_device_id tmp51x_id[] = {
613 { "tmp512", TMP512_MAX_CHANNELS },
614 { "tmp513", TMP513_MAX_CHANNELS },
615 { }
616 };
617 MODULE_DEVICE_TABLE(i2c, tmp51x_id);
618
619 static const struct of_device_id tmp51x_of_match[] = {
620 { .compatible = "ti,tmp512", .data = (void *)TMP512_MAX_CHANNELS },
621 { .compatible = "ti,tmp513", .data = (void *)TMP513_MAX_CHANNELS },
622 { }
623 };
624 MODULE_DEVICE_TABLE(of, tmp51x_of_match);
625
tmp51x_vbus_range_to_reg(struct device * dev,struct tmp51x_data * data)626 static int tmp51x_vbus_range_to_reg(struct device *dev,
627 struct tmp51x_data *data)
628 {
629 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) {
630 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK;
631 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) {
632 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK;
633 } else {
634 return dev_err_probe(dev, -EINVAL,
635 "ti,bus-range-microvolt is invalid: %u\n",
636 data->vbus_range_uvolt);
637 }
638 return 0;
639 }
640
tmp51x_pga_gain_to_reg(struct device * dev,struct tmp51x_data * data)641 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data)
642 {
643 if (data->pga_gain == 8) {
644 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK;
645 } else if (data->pga_gain == 4) {
646 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK;
647 } else if (data->pga_gain == 2) {
648 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK;
649 } else if (data->pga_gain == 1) {
650 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK;
651 } else {
652 return dev_err_probe(dev, -EINVAL,
653 "ti,pga-gain is invalid: %u\n", data->pga_gain);
654 }
655 return 0;
656 }
657
tmp51x_read_properties(struct device * dev,struct tmp51x_data * data)658 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data)
659 {
660 int ret;
661 u32 val;
662
663 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val);
664 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT;
665
666 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val);
667 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT;
668 ret = tmp51x_vbus_range_to_reg(dev, data);
669 if (ret < 0)
670 return ret;
671
672 ret = device_property_read_u32(dev, "ti,pga-gain", &val);
673 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT;
674 ret = tmp51x_pga_gain_to_reg(dev, data);
675 if (ret < 0)
676 return ret;
677
678 device_property_read_u32_array(dev, "ti,nfactor", data->nfactor,
679 data->max_channels - 1);
680
681 // Check if shunt value is compatible with pga-gain
682 if (data->shunt_uohms > data->pga_gain * 40 * MICRO) {
683 return dev_err_probe(dev, -EINVAL,
684 "shunt-resistor: %u too big for pga_gain: %u\n",
685 data->shunt_uohms, data->pga_gain);
686 }
687
688 return 0;
689 }
690
tmp51x_use_default(struct tmp51x_data * data)691 static void tmp51x_use_default(struct tmp51x_data *data)
692 {
693 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT;
694 data->pga_gain = TMP51X_PGA_DEFAULT;
695 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT;
696 }
697
tmp51x_configure(struct device * dev,struct tmp51x_data * data)698 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data)
699 {
700 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT;
701 data->temp_config = TMP51X_TEMP_CONFIG_DEFAULT(data->max_channels);
702
703 if (dev->of_node)
704 return tmp51x_read_properties(dev, data);
705
706 tmp51x_use_default(data);
707
708 return 0;
709 }
710
tmp51x_probe(struct i2c_client * client)711 static int tmp51x_probe(struct i2c_client *client)
712 {
713 struct device *dev = &client->dev;
714 struct tmp51x_data *data;
715 struct device *hwmon_dev;
716 int ret;
717
718 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
719 if (!data)
720 return -ENOMEM;
721
722 data->max_channels = (uintptr_t)i2c_get_match_data(client);
723
724 ret = tmp51x_configure(dev, data);
725 if (ret < 0)
726 return dev_err_probe(dev, ret, "error configuring the device\n");
727
728 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config);
729 if (IS_ERR(data->regmap))
730 return dev_err_probe(dev, PTR_ERR(data->regmap),
731 "failed to allocate register map\n");
732
733 ret = tmp51x_init(data);
734 if (ret < 0)
735 return dev_err_probe(dev, ret, "error configuring the device\n");
736
737 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
738 data,
739 &tmp51x_chip_info,
740 NULL);
741 if (IS_ERR(hwmon_dev))
742 return PTR_ERR(hwmon_dev);
743
744 dev_dbg(dev, "power monitor %s\n", client->name);
745
746 return 0;
747 }
748
749 static struct i2c_driver tmp51x_driver = {
750 .driver = {
751 .name = "tmp51x",
752 .of_match_table = tmp51x_of_match,
753 },
754 .probe = tmp51x_probe,
755 .id_table = tmp51x_id,
756 };
757
758 module_i2c_driver(tmp51x_driver);
759
760 MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>");
761 MODULE_DESCRIPTION("tmp51x driver");
762 MODULE_LICENSE("GPL");
763