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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 | |
e263f2d3 | 8 | * Datasheet: https://www.ti.com/lit/gpn/tmp513 |
59dfa75e ET |
9 | * |
10 | * TMP512: | |
11 | * Thermal/Power Management with Dual Remote | |
12 | * and Local Temperature Sensor and Current Shunt Monitor | |
e263f2d3 | 13 | * Datasheet: https://www.ti.com/lit/gpn/tmp512 |
59dfa75e ET |
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/err.h> | |
23 | #include <linux/hwmon.h> | |
24 | #include <linux/i2c.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/regmap.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/util_macros.h> | |
31 | ||
32 | // Common register definition | |
33 | #define TMP51X_SHUNT_CONFIG 0x00 | |
34 | #define TMP51X_TEMP_CONFIG 0x01 | |
35 | #define TMP51X_STATUS 0x02 | |
36 | #define TMP51X_SMBUS_ALERT 0x03 | |
37 | #define TMP51X_SHUNT_CURRENT_RESULT 0x04 | |
38 | #define TMP51X_BUS_VOLTAGE_RESULT 0x05 | |
39 | #define TMP51X_POWER_RESULT 0x06 | |
40 | #define TMP51X_BUS_CURRENT_RESULT 0x07 | |
41 | #define TMP51X_LOCAL_TEMP_RESULT 0x08 | |
42 | #define TMP51X_REMOTE_TEMP_RESULT_1 0x09 | |
43 | #define TMP51X_REMOTE_TEMP_RESULT_2 0x0A | |
44 | #define TMP51X_SHUNT_CURRENT_H_LIMIT 0x0C | |
45 | #define TMP51X_SHUNT_CURRENT_L_LIMIT 0x0D | |
46 | #define TMP51X_BUS_VOLTAGE_H_LIMIT 0x0E | |
47 | #define TMP51X_BUS_VOLTAGE_L_LIMIT 0x0F | |
48 | #define TMP51X_POWER_LIMIT 0x10 | |
49 | #define TMP51X_LOCAL_TEMP_LIMIT 0x11 | |
50 | #define TMP51X_REMOTE_TEMP_LIMIT_1 0x12 | |
51 | #define TMP51X_REMOTE_TEMP_LIMIT_2 0x13 | |
52 | #define TMP51X_SHUNT_CALIBRATION 0x15 | |
53 | #define TMP51X_N_FACTOR_AND_HYST_1 0x16 | |
54 | #define TMP51X_N_FACTOR_2 0x17 | |
55 | #define TMP51X_MAN_ID_REG 0xFE | |
56 | #define TMP51X_DEVICE_ID_REG 0xFF | |
57 | ||
58 | // TMP513 specific register definition | |
59 | #define TMP513_REMOTE_TEMP_RESULT_3 0x0B | |
60 | #define TMP513_REMOTE_TEMP_LIMIT_3 0x14 | |
61 | #define TMP513_N_FACTOR_3 0x18 | |
62 | ||
63 | // Common attrs, and NULL | |
64 | #define TMP51X_MANUFACTURER_ID 0x55FF | |
65 | ||
66 | #define TMP512_DEVICE_ID 0x22FF | |
67 | #define TMP513_DEVICE_ID 0x23FF | |
68 | ||
69 | // Default config | |
70 | #define TMP51X_SHUNT_CONFIG_DEFAULT 0x399F | |
71 | #define TMP51X_SHUNT_VALUE_DEFAULT 1000 | |
72 | #define TMP51X_VBUS_RANGE_DEFAULT TMP51X_VBUS_RANGE_32V | |
73 | #define TMP51X_PGA_DEFAULT 8 | |
74 | #define TMP51X_MAX_REGISTER_ADDR 0xFF | |
75 | ||
76 | #define TMP512_TEMP_CONFIG_DEFAULT 0xBF80 | |
77 | #define TMP513_TEMP_CONFIG_DEFAULT 0xFF80 | |
78 | ||
79 | // Mask and shift | |
80 | #define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800 | |
81 | #define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000 | |
82 | #define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800 | |
83 | #define CURRENT_SENSE_VOLTAGE_40_MASK 0 | |
84 | ||
85 | #define TMP51X_BUS_VOLTAGE_MASK 0x2000 | |
86 | #define TMP51X_NFACTOR_MASK 0xFF00 | |
87 | #define TMP51X_HYST_MASK 0x00FF | |
88 | ||
89 | #define TMP51X_BUS_VOLTAGE_SHIFT 3 | |
90 | #define TMP51X_TEMP_SHIFT 3 | |
91 | ||
92 | // Alarms | |
93 | #define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15 | |
94 | #define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14 | |
95 | #define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13 | |
96 | #define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12 | |
97 | #define TMP51X_POWER_LIMIT_POS 11 | |
98 | #define TMP51X_LOCAL_TEMP_LIMIT_POS 10 | |
99 | #define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9 | |
100 | #define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8 | |
101 | #define TMP513_REMOTE_TEMP_LIMIT_3_POS 7 | |
102 | ||
103 | #define TMP51X_VBUS_RANGE_32V 32000000 | |
104 | #define TMP51X_VBUS_RANGE_16V 16000000 | |
105 | ||
106 | // Max and Min value | |
107 | #define MAX_BUS_VOLTAGE_32_LIMIT 32764 | |
108 | #define MAX_BUS_VOLTAGE_16_LIMIT 16382 | |
109 | ||
110 | // Max possible value is -256 to +256 but datasheet indicated -40 to 125. | |
111 | #define MAX_TEMP_LIMIT 125000 | |
112 | #define MIN_TEMP_LIMIT -40000 | |
113 | ||
114 | #define MAX_TEMP_HYST 127500 | |
115 | ||
116 | static const u8 TMP51X_TEMP_INPUT[4] = { | |
117 | TMP51X_LOCAL_TEMP_RESULT, | |
118 | TMP51X_REMOTE_TEMP_RESULT_1, | |
119 | TMP51X_REMOTE_TEMP_RESULT_2, | |
120 | TMP513_REMOTE_TEMP_RESULT_3 | |
121 | }; | |
122 | ||
123 | static const u8 TMP51X_TEMP_CRIT[4] = { | |
124 | TMP51X_LOCAL_TEMP_LIMIT, | |
125 | TMP51X_REMOTE_TEMP_LIMIT_1, | |
126 | TMP51X_REMOTE_TEMP_LIMIT_2, | |
127 | TMP513_REMOTE_TEMP_LIMIT_3 | |
128 | }; | |
129 | ||
130 | static const u8 TMP51X_TEMP_CRIT_ALARM[4] = { | |
131 | TMP51X_LOCAL_TEMP_LIMIT_POS, | |
132 | TMP51X_REMOTE_TEMP_LIMIT_1_POS, | |
133 | TMP51X_REMOTE_TEMP_LIMIT_2_POS, | |
134 | TMP513_REMOTE_TEMP_LIMIT_3_POS | |
135 | }; | |
136 | ||
137 | static const u8 TMP51X_TEMP_CRIT_HYST[4] = { | |
138 | TMP51X_N_FACTOR_AND_HYST_1, | |
139 | TMP51X_N_FACTOR_AND_HYST_1, | |
140 | TMP51X_N_FACTOR_AND_HYST_1, | |
141 | TMP51X_N_FACTOR_AND_HYST_1 | |
142 | }; | |
143 | ||
144 | static const u8 TMP51X_CURR_INPUT[2] = { | |
145 | TMP51X_SHUNT_CURRENT_RESULT, | |
146 | TMP51X_BUS_CURRENT_RESULT | |
147 | }; | |
148 | ||
149 | static struct regmap_config tmp51x_regmap_config = { | |
150 | .reg_bits = 8, | |
151 | .val_bits = 16, | |
152 | .max_register = TMP51X_MAX_REGISTER_ADDR, | |
153 | }; | |
154 | ||
155 | enum tmp51x_ids { | |
156 | tmp512, tmp513 | |
157 | }; | |
158 | ||
159 | struct tmp51x_data { | |
160 | u16 shunt_config; | |
161 | u16 pga_gain; | |
162 | u32 vbus_range_uvolt; | |
163 | ||
164 | u16 temp_config; | |
165 | u32 nfactor[3]; | |
166 | ||
167 | u32 shunt_uohms; | |
168 | ||
169 | u32 curr_lsb_ua; | |
170 | u32 pwr_lsb_uw; | |
171 | ||
172 | enum tmp51x_ids id; | |
173 | struct regmap *regmap; | |
174 | }; | |
175 | ||
176 | // Set the shift based on the gain 8=4, 4=3, 2=2, 1=1 | |
177 | static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) | |
178 | { | |
179 | return 5 - ffs(data->pga_gain); | |
180 | } | |
181 | ||
182 | static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos, | |
183 | unsigned int regval, long *val) | |
184 | { | |
185 | switch (reg) { | |
186 | case TMP51X_STATUS: | |
187 | *val = (regval >> pos) & 1; | |
188 | break; | |
189 | case TMP51X_SHUNT_CURRENT_RESULT: | |
190 | case TMP51X_SHUNT_CURRENT_H_LIMIT: | |
191 | case TMP51X_SHUNT_CURRENT_L_LIMIT: | |
192 | /* | |
193 | * The valus is read in voltage in the chip but reported as | |
194 | * current to the user. | |
c073292b | 195 | * 2's complement number shifted by one to four depending |
59dfa75e ET |
196 | * on the pga gain setting. 1lsb = 10uV |
197 | */ | |
198 | *val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data)); | |
199 | *val = DIV_ROUND_CLOSEST(*val * 10000, data->shunt_uohms); | |
200 | break; | |
201 | case TMP51X_BUS_VOLTAGE_RESULT: | |
202 | case TMP51X_BUS_VOLTAGE_H_LIMIT: | |
203 | case TMP51X_BUS_VOLTAGE_L_LIMIT: | |
204 | // 1lsb = 4mV | |
205 | *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; | |
206 | break; | |
207 | case TMP51X_POWER_RESULT: | |
208 | case TMP51X_POWER_LIMIT: | |
209 | // Power = (current * BusVoltage) / 5000 | |
210 | *val = regval * data->pwr_lsb_uw; | |
211 | break; | |
212 | case TMP51X_BUS_CURRENT_RESULT: | |
213 | // Current = (ShuntVoltage * CalibrationRegister) / 4096 | |
214 | *val = sign_extend32(regval, 16) * data->curr_lsb_ua; | |
215 | *val = DIV_ROUND_CLOSEST(*val, 1000); | |
216 | break; | |
217 | case TMP51X_LOCAL_TEMP_RESULT: | |
218 | case TMP51X_REMOTE_TEMP_RESULT_1: | |
219 | case TMP51X_REMOTE_TEMP_RESULT_2: | |
220 | case TMP513_REMOTE_TEMP_RESULT_3: | |
221 | case TMP51X_LOCAL_TEMP_LIMIT: | |
222 | case TMP51X_REMOTE_TEMP_LIMIT_1: | |
223 | case TMP51X_REMOTE_TEMP_LIMIT_2: | |
224 | case TMP513_REMOTE_TEMP_LIMIT_3: | |
225 | // 1lsb = 0.0625 degrees centigrade | |
226 | *val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT; | |
227 | *val = DIV_ROUND_CLOSEST(*val * 625, 10); | |
228 | break; | |
229 | case TMP51X_N_FACTOR_AND_HYST_1: | |
230 | // 1lsb = 0.5 degrees centigrade | |
231 | *val = (regval & TMP51X_HYST_MASK) * 500; | |
232 | break; | |
233 | default: | |
234 | // Programmer goofed | |
235 | WARN_ON_ONCE(1); | |
236 | *val = 0; | |
237 | return -EOPNOTSUPP; | |
238 | } | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) | |
244 | { | |
245 | int regval, max_val; | |
246 | u32 mask = 0; | |
247 | ||
248 | switch (reg) { | |
249 | case TMP51X_SHUNT_CURRENT_H_LIMIT: | |
250 | case TMP51X_SHUNT_CURRENT_L_LIMIT: | |
251 | /* | |
252 | * The user enter current value and we convert it to | |
253 | * voltage. 1lsb = 10uV | |
254 | */ | |
255 | val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10000); | |
256 | max_val = U16_MAX >> tmp51x_get_pga_shift(data); | |
257 | regval = clamp_val(val, -max_val, max_val); | |
258 | break; | |
259 | case TMP51X_BUS_VOLTAGE_H_LIMIT: | |
260 | case TMP51X_BUS_VOLTAGE_L_LIMIT: | |
261 | // 1lsb = 4mV | |
262 | max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? | |
263 | MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; | |
264 | ||
265 | val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); | |
266 | regval = val << TMP51X_BUS_VOLTAGE_SHIFT; | |
267 | break; | |
268 | case TMP51X_POWER_LIMIT: | |
269 | regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, | |
270 | U16_MAX); | |
271 | break; | |
272 | case TMP51X_LOCAL_TEMP_LIMIT: | |
273 | case TMP51X_REMOTE_TEMP_LIMIT_1: | |
274 | case TMP51X_REMOTE_TEMP_LIMIT_2: | |
275 | case TMP513_REMOTE_TEMP_LIMIT_3: | |
276 | // 1lsb = 0.0625 degrees centigrade | |
277 | val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); | |
278 | regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; | |
279 | break; | |
280 | case TMP51X_N_FACTOR_AND_HYST_1: | |
281 | // 1lsb = 0.5 degrees centigrade | |
282 | val = clamp_val(val, 0, MAX_TEMP_HYST); | |
283 | regval = DIV_ROUND_CLOSEST(val, 500); | |
284 | mask = TMP51X_HYST_MASK; | |
285 | break; | |
286 | default: | |
287 | // Programmer goofed | |
288 | WARN_ON_ONCE(1); | |
289 | return -EOPNOTSUPP; | |
290 | } | |
291 | ||
292 | if (mask == 0) | |
293 | return regmap_write(data->regmap, reg, regval); | |
294 | else | |
295 | return regmap_update_bits(data->regmap, reg, mask, regval); | |
296 | } | |
297 | ||
298 | static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) | |
299 | { | |
300 | switch (type) { | |
301 | case hwmon_temp: | |
302 | switch (attr) { | |
303 | case hwmon_temp_input: | |
304 | return TMP51X_TEMP_INPUT[channel]; | |
305 | case hwmon_temp_crit_alarm: | |
306 | return TMP51X_STATUS; | |
307 | case hwmon_temp_crit: | |
308 | return TMP51X_TEMP_CRIT[channel]; | |
309 | case hwmon_temp_crit_hyst: | |
310 | return TMP51X_TEMP_CRIT_HYST[channel]; | |
311 | } | |
312 | break; | |
313 | case hwmon_in: | |
314 | switch (attr) { | |
315 | case hwmon_in_input: | |
316 | return TMP51X_BUS_VOLTAGE_RESULT; | |
317 | case hwmon_in_lcrit_alarm: | |
318 | case hwmon_in_crit_alarm: | |
319 | return TMP51X_STATUS; | |
320 | case hwmon_in_lcrit: | |
321 | return TMP51X_BUS_VOLTAGE_L_LIMIT; | |
322 | case hwmon_in_crit: | |
323 | return TMP51X_BUS_VOLTAGE_H_LIMIT; | |
324 | } | |
325 | break; | |
326 | case hwmon_curr: | |
327 | switch (attr) { | |
328 | case hwmon_curr_input: | |
329 | return TMP51X_CURR_INPUT[channel]; | |
330 | case hwmon_curr_lcrit_alarm: | |
331 | case hwmon_curr_crit_alarm: | |
332 | return TMP51X_STATUS; | |
333 | case hwmon_curr_lcrit: | |
334 | return TMP51X_SHUNT_CURRENT_L_LIMIT; | |
335 | case hwmon_curr_crit: | |
336 | return TMP51X_SHUNT_CURRENT_H_LIMIT; | |
337 | } | |
338 | break; | |
339 | case hwmon_power: | |
340 | switch (attr) { | |
341 | case hwmon_power_input: | |
342 | return TMP51X_POWER_RESULT; | |
343 | case hwmon_power_crit_alarm: | |
344 | return TMP51X_STATUS; | |
345 | case hwmon_power_crit: | |
346 | return TMP51X_POWER_LIMIT; | |
347 | } | |
348 | break; | |
349 | default: | |
350 | break; | |
351 | } | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, | |
357 | int channel) | |
358 | { | |
359 | switch (type) { | |
360 | case hwmon_temp: | |
361 | switch (attr) { | |
362 | case hwmon_temp_crit_alarm: | |
363 | return TMP51X_TEMP_CRIT_ALARM[channel]; | |
364 | } | |
365 | break; | |
366 | case hwmon_in: | |
367 | switch (attr) { | |
368 | case hwmon_in_lcrit_alarm: | |
369 | return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; | |
370 | case hwmon_in_crit_alarm: | |
371 | return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; | |
372 | } | |
373 | break; | |
374 | case hwmon_curr: | |
375 | switch (attr) { | |
376 | case hwmon_curr_lcrit_alarm: | |
377 | return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; | |
378 | case hwmon_curr_crit_alarm: | |
379 | return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; | |
380 | } | |
381 | break; | |
382 | case hwmon_power: | |
383 | switch (attr) { | |
384 | case hwmon_power_crit_alarm: | |
385 | return TMP51X_POWER_LIMIT_POS; | |
386 | } | |
387 | break; | |
388 | default: | |
389 | break; | |
390 | } | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, | |
396 | u32 attr, int channel, long *val) | |
397 | { | |
398 | struct tmp51x_data *data = dev_get_drvdata(dev); | |
399 | int ret; | |
400 | u32 regval; | |
401 | u8 pos = 0, reg = 0; | |
402 | ||
403 | reg = tmp51x_get_reg(type, attr, channel); | |
404 | if (reg == 0) | |
405 | return -EOPNOTSUPP; | |
406 | ||
407 | if (reg == TMP51X_STATUS) | |
408 | pos = tmp51x_get_status_pos(type, attr, channel); | |
409 | ||
410 | ret = regmap_read(data->regmap, reg, ®val); | |
411 | if (ret < 0) | |
412 | return ret; | |
413 | ||
414 | return tmp51x_get_value(data, reg, pos, regval, val); | |
415 | } | |
416 | ||
417 | static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, | |
418 | u32 attr, int channel, long val) | |
419 | { | |
420 | u8 reg = 0; | |
421 | ||
422 | reg = tmp51x_get_reg(type, attr, channel); | |
423 | if (reg == 0) | |
424 | return -EOPNOTSUPP; | |
425 | ||
426 | return tmp51x_set_value(dev_get_drvdata(dev), reg, val); | |
427 | } | |
428 | ||
429 | static umode_t tmp51x_is_visible(const void *_data, | |
430 | enum hwmon_sensor_types type, u32 attr, | |
431 | int channel) | |
432 | { | |
433 | const struct tmp51x_data *data = _data; | |
434 | ||
435 | switch (type) { | |
436 | case hwmon_temp: | |
437 | if (data->id == tmp512 && channel == 4) | |
438 | return 0; | |
439 | switch (attr) { | |
440 | case hwmon_temp_input: | |
441 | case hwmon_temp_crit_alarm: | |
442 | return 0444; | |
443 | case hwmon_temp_crit: | |
444 | return 0644; | |
445 | case hwmon_temp_crit_hyst: | |
446 | if (channel == 0) | |
447 | return 0644; | |
448 | return 0444; | |
449 | } | |
450 | break; | |
451 | case hwmon_in: | |
452 | switch (attr) { | |
453 | case hwmon_in_input: | |
454 | case hwmon_in_lcrit_alarm: | |
455 | case hwmon_in_crit_alarm: | |
456 | return 0444; | |
457 | case hwmon_in_lcrit: | |
458 | case hwmon_in_crit: | |
459 | return 0644; | |
460 | } | |
461 | break; | |
462 | case hwmon_curr: | |
463 | if (!data->shunt_uohms) | |
464 | return 0; | |
465 | ||
466 | switch (attr) { | |
467 | case hwmon_curr_input: | |
468 | case hwmon_curr_lcrit_alarm: | |
469 | case hwmon_curr_crit_alarm: | |
470 | return 0444; | |
471 | case hwmon_curr_lcrit: | |
472 | case hwmon_curr_crit: | |
473 | return 0644; | |
474 | } | |
475 | break; | |
476 | case hwmon_power: | |
477 | if (!data->shunt_uohms) | |
478 | return 0; | |
479 | ||
480 | switch (attr) { | |
481 | case hwmon_power_input: | |
482 | case hwmon_power_crit_alarm: | |
483 | return 0444; | |
484 | case hwmon_power_crit: | |
485 | return 0644; | |
486 | } | |
487 | break; | |
488 | default: | |
489 | break; | |
490 | } | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static const struct hwmon_channel_info *tmp51x_info[] = { | |
495 | HWMON_CHANNEL_INFO(temp, | |
496 | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | | |
497 | HWMON_T_CRIT_HYST, | |
498 | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | | |
499 | HWMON_T_CRIT_HYST, | |
500 | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | | |
501 | HWMON_T_CRIT_HYST, | |
502 | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | | |
503 | HWMON_T_CRIT_HYST), | |
504 | HWMON_CHANNEL_INFO(in, | |
505 | HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | | |
506 | HWMON_I_CRIT | HWMON_I_CRIT_ALARM), | |
507 | HWMON_CHANNEL_INFO(curr, | |
508 | HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | | |
509 | HWMON_C_CRIT | HWMON_C_CRIT_ALARM, | |
510 | HWMON_C_INPUT), | |
511 | HWMON_CHANNEL_INFO(power, | |
512 | HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), | |
513 | NULL | |
514 | }; | |
515 | ||
516 | static const struct hwmon_ops tmp51x_hwmon_ops = { | |
517 | .is_visible = tmp51x_is_visible, | |
518 | .read = tmp51x_read, | |
519 | .write = tmp51x_write, | |
520 | }; | |
521 | ||
522 | static const struct hwmon_chip_info tmp51x_chip_info = { | |
523 | .ops = &tmp51x_hwmon_ops, | |
524 | .info = tmp51x_info, | |
525 | }; | |
526 | ||
527 | /* | |
528 | * Calibrate the tmp51x following the datasheet method | |
529 | */ | |
530 | static int tmp51x_calibrate(struct tmp51x_data *data) | |
531 | { | |
532 | int vshunt_max = data->pga_gain * 40; | |
533 | u64 max_curr_ma; | |
534 | u32 div; | |
535 | ||
536 | /* | |
537 | * If shunt_uohms is equal to 0, the calibration should be set to 0. | |
538 | * The consequence will be that the current and power measurement engine | |
539 | * of the sensor will not work. Temperature and voltage sensing will | |
540 | * continue to work. | |
541 | */ | |
542 | if (data->shunt_uohms == 0) | |
543 | return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); | |
544 | ||
545 | max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * 1000 * 1000, | |
546 | data->shunt_uohms); | |
547 | ||
548 | /* | |
549 | * Calculate the minimal bit resolution for the current and the power. | |
550 | * Those values will be used during register interpretation. | |
551 | */ | |
552 | data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * 1000, 32767); | |
553 | data->pwr_lsb_uw = 20 * data->curr_lsb_ua; | |
554 | ||
555 | div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, | |
556 | 1000 * 1000); | |
557 | ||
558 | return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, | |
559 | DIV_ROUND_CLOSEST(40960, div)); | |
560 | } | |
561 | ||
562 | /* | |
563 | * Initialize the configuration and calibration registers. | |
564 | */ | |
565 | static int tmp51x_init(struct tmp51x_data *data) | |
566 | { | |
567 | unsigned int regval; | |
568 | int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, | |
569 | data->shunt_config); | |
570 | if (ret < 0) | |
571 | return ret; | |
572 | ||
573 | ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); | |
574 | if (ret < 0) | |
575 | return ret; | |
576 | ||
577 | // nFactor configuration | |
578 | ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, | |
579 | TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); | |
580 | if (ret < 0) | |
581 | return ret; | |
582 | ||
583 | ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, | |
584 | data->nfactor[1] << 8); | |
585 | if (ret < 0) | |
586 | return ret; | |
587 | ||
588 | if (data->id == tmp513) { | |
589 | ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, | |
590 | data->nfactor[2] << 8); | |
591 | if (ret < 0) | |
592 | return ret; | |
593 | } | |
594 | ||
595 | ret = tmp51x_calibrate(data); | |
596 | if (ret < 0) | |
597 | return ret; | |
598 | ||
599 | // Read the status register before using as the datasheet propose | |
600 | return regmap_read(data->regmap, TMP51X_STATUS, ®val); | |
601 | } | |
602 | ||
603 | static const struct i2c_device_id tmp51x_id[] = { | |
604 | { "tmp512", tmp512 }, | |
605 | { "tmp513", tmp513 }, | |
606 | { } | |
607 | }; | |
608 | MODULE_DEVICE_TABLE(i2c, tmp51x_id); | |
609 | ||
610 | static const struct of_device_id tmp51x_of_match[] = { | |
611 | { | |
612 | .compatible = "ti,tmp512", | |
613 | .data = (void *)tmp512 | |
614 | }, | |
615 | { | |
616 | .compatible = "ti,tmp513", | |
617 | .data = (void *)tmp513 | |
618 | }, | |
619 | { }, | |
620 | }; | |
621 | MODULE_DEVICE_TABLE(of, tmp51x_of_match); | |
622 | ||
623 | static int tmp51x_vbus_range_to_reg(struct device *dev, | |
624 | struct tmp51x_data *data) | |
625 | { | |
626 | if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { | |
627 | data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; | |
628 | } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { | |
629 | data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; | |
630 | } else { | |
631 | dev_err(dev, "ti,bus-range-microvolt is invalid: %u\n", | |
632 | data->vbus_range_uvolt); | |
633 | return -EINVAL; | |
634 | } | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) | |
639 | { | |
640 | if (data->pga_gain == 8) { | |
641 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; | |
642 | } else if (data->pga_gain == 4) { | |
643 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; | |
644 | } else if (data->pga_gain == 2) { | |
645 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; | |
646 | } else if (data->pga_gain == 1) { | |
647 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; | |
648 | } else { | |
649 | dev_err(dev, "ti,pga-gain is invalid: %u\n", data->pga_gain); | |
650 | return -EINVAL; | |
651 | } | |
652 | return 0; | |
653 | } | |
654 | ||
655 | static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) | |
656 | { | |
657 | int ret; | |
658 | u32 nfactor[3]; | |
659 | u32 val; | |
660 | ||
661 | ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); | |
662 | data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; | |
663 | ||
664 | ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); | |
665 | data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; | |
666 | ret = tmp51x_vbus_range_to_reg(dev, data); | |
667 | if (ret < 0) | |
668 | return ret; | |
669 | ||
670 | ret = device_property_read_u32(dev, "ti,pga-gain", &val); | |
671 | data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; | |
672 | ret = tmp51x_pga_gain_to_reg(dev, data); | |
673 | if (ret < 0) | |
674 | return ret; | |
675 | ||
676 | ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor, | |
677 | (data->id == tmp513) ? 3 : 2); | |
678 | if (ret >= 0) | |
679 | memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2); | |
680 | ||
681 | // Check if shunt value is compatible with pga-gain | |
682 | if (data->shunt_uohms > data->pga_gain * 40 * 1000 * 1000) { | |
683 | dev_err(dev, "shunt-resistor: %u too big for pga_gain: %u\n", | |
684 | data->shunt_uohms, data->pga_gain); | |
685 | return -EINVAL; | |
686 | } | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
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 | ||
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 = (data->id == tmp513) ? | |
702 | TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT; | |
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 | ||
e3b9f691 | 712 | static int tmp51x_probe(struct i2c_client *client) |
59dfa75e ET |
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 | if (client->dev.of_node) | |
724 | data->id = (enum tmp51x_ids)device_get_match_data(&client->dev); | |
725 | else | |
e3b9f691 | 726 | data->id = i2c_match_id(tmp51x_id, client)->driver_data; |
59dfa75e ET |
727 | |
728 | ret = tmp51x_configure(dev, data); | |
729 | if (ret < 0) { | |
730 | dev_err(dev, "error configuring the device: %d\n", ret); | |
731 | return ret; | |
732 | } | |
733 | ||
734 | data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); | |
735 | if (IS_ERR(data->regmap)) { | |
736 | dev_err(dev, "failed to allocate register map\n"); | |
737 | return PTR_ERR(data->regmap); | |
738 | } | |
739 | ||
740 | ret = tmp51x_init(data); | |
741 | if (ret < 0) { | |
742 | dev_err(dev, "error configuring the device: %d\n", ret); | |
743 | return -ENODEV; | |
744 | } | |
745 | ||
746 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, | |
747 | data, | |
748 | &tmp51x_chip_info, | |
749 | NULL); | |
750 | if (IS_ERR(hwmon_dev)) | |
751 | return PTR_ERR(hwmon_dev); | |
752 | ||
e3b9f691 | 753 | dev_dbg(dev, "power monitor %s\n", client->name); |
59dfa75e ET |
754 | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static struct i2c_driver tmp51x_driver = { | |
759 | .driver = { | |
760 | .name = "tmp51x", | |
761 | .of_match_table = of_match_ptr(tmp51x_of_match), | |
762 | }, | |
e3b9f691 | 763 | .probe_new = tmp51x_probe, |
59dfa75e ET |
764 | .id_table = tmp51x_id, |
765 | }; | |
766 | ||
767 | module_i2c_driver(tmp51x_driver); | |
768 | ||
769 | MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); | |
770 | MODULE_DESCRIPTION("tmp51x driver"); | |
771 | MODULE_LICENSE("GPL"); |