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59dfa75e ET |
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 | ||
5d9ad4e0 AS |
22 | #include <linux/bitops.h> |
23 | #include <linux/bug.h> | |
24 | #include <linux/device.h> | |
59dfa75e ET |
25 | #include <linux/err.h> |
26 | #include <linux/hwmon.h> | |
27 | #include <linux/i2c.h> | |
28 | #include <linux/init.h> | |
5d9ad4e0 | 29 | #include <linux/math.h> |
59dfa75e | 30 | #include <linux/module.h> |
5d9ad4e0 | 31 | #include <linux/property.h> |
59dfa75e ET |
32 | #include <linux/regmap.h> |
33 | #include <linux/slab.h> | |
5d9ad4e0 | 34 | #include <linux/types.h> |
f07f9d24 | 35 | #include <linux/units.h> |
59dfa75e ET |
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 | ||
59dfa75e ET |
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 | ||
f07f9d24 AS |
105 | #define TMP51X_VBUS_RANGE_32V (32 * MICRO) |
106 | #define TMP51X_VBUS_RANGE_16V (16 * MICRO) | |
59dfa75e ET |
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 | ||
fb99e07a BD |
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 | ||
59dfa75e ET |
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 | ||
4bc82dd2 | 162 | static const struct regmap_config tmp51x_regmap_config = { |
59dfa75e ET |
163 | .reg_bits = 8, |
164 | .val_bits = 16, | |
165 | .max_register = TMP51X_MAX_REGISTER_ADDR, | |
166 | }; | |
167 | ||
59dfa75e ET |
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 | ||
fb99e07a | 181 | u8 max_channels; |
59dfa75e ET |
182 | struct regmap *regmap; |
183 | }; | |
184 | ||
185 | // Set the shift based on the gain 8=4, 4=3, 2=2, 1=1 | |
186 | static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) | |
187 | { | |
188 | return 5 - ffs(data->pga_gain); | |
189 | } | |
190 | ||
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. | |
c073292b | 204 | * 2's complement number shifted by one to four depending |
59dfa75e ET |
205 | * on the pga gain setting. 1lsb = 10uV |
206 | */ | |
207 | *val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data)); | |
f07f9d24 | 208 | *val = DIV_ROUND_CLOSEST(*val * 10 * MILLI, data->shunt_uohms); |
59dfa75e ET |
209 | break; |
210 | case TMP51X_BUS_VOLTAGE_RESULT: | |
211 | case TMP51X_BUS_VOLTAGE_H_LIMIT: | |
212 | case TMP51X_BUS_VOLTAGE_L_LIMIT: | |
213 | // 1lsb = 4mV | |
214 | *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; | |
215 | break; | |
216 | case TMP51X_POWER_RESULT: | |
217 | case TMP51X_POWER_LIMIT: | |
218 | // Power = (current * BusVoltage) / 5000 | |
219 | *val = regval * data->pwr_lsb_uw; | |
220 | break; | |
221 | case TMP51X_BUS_CURRENT_RESULT: | |
222 | // Current = (ShuntVoltage * CalibrationRegister) / 4096 | |
223 | *val = sign_extend32(regval, 16) * data->curr_lsb_ua; | |
f07f9d24 | 224 | *val = DIV_ROUND_CLOSEST(*val, MILLI); |
59dfa75e ET |
225 | break; |
226 | case TMP51X_LOCAL_TEMP_RESULT: | |
227 | case TMP51X_REMOTE_TEMP_RESULT_1: | |
228 | case TMP51X_REMOTE_TEMP_RESULT_2: | |
229 | case TMP513_REMOTE_TEMP_RESULT_3: | |
230 | case TMP51X_LOCAL_TEMP_LIMIT: | |
231 | case TMP51X_REMOTE_TEMP_LIMIT_1: | |
232 | case TMP51X_REMOTE_TEMP_LIMIT_2: | |
233 | case TMP513_REMOTE_TEMP_LIMIT_3: | |
234 | // 1lsb = 0.0625 degrees centigrade | |
235 | *val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT; | |
236 | *val = DIV_ROUND_CLOSEST(*val * 625, 10); | |
237 | break; | |
238 | case TMP51X_N_FACTOR_AND_HYST_1: | |
239 | // 1lsb = 0.5 degrees centigrade | |
240 | *val = (regval & TMP51X_HYST_MASK) * 500; | |
241 | break; | |
242 | default: | |
243 | // Programmer goofed | |
244 | WARN_ON_ONCE(1); | |
245 | *val = 0; | |
246 | return -EOPNOTSUPP; | |
247 | } | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) | |
253 | { | |
254 | int regval, max_val; | |
255 | u32 mask = 0; | |
256 | ||
257 | switch (reg) { | |
258 | case TMP51X_SHUNT_CURRENT_H_LIMIT: | |
259 | case TMP51X_SHUNT_CURRENT_L_LIMIT: | |
260 | /* | |
261 | * The user enter current value and we convert it to | |
262 | * voltage. 1lsb = 10uV | |
263 | */ | |
f07f9d24 | 264 | val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10 * MILLI); |
59dfa75e ET |
265 | max_val = U16_MAX >> tmp51x_get_pga_shift(data); |
266 | regval = clamp_val(val, -max_val, max_val); | |
267 | break; | |
268 | case TMP51X_BUS_VOLTAGE_H_LIMIT: | |
269 | case TMP51X_BUS_VOLTAGE_L_LIMIT: | |
270 | // 1lsb = 4mV | |
271 | max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? | |
272 | MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; | |
273 | ||
274 | val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); | |
275 | regval = val << TMP51X_BUS_VOLTAGE_SHIFT; | |
276 | break; | |
277 | case TMP51X_POWER_LIMIT: | |
278 | regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, | |
279 | U16_MAX); | |
280 | break; | |
281 | case TMP51X_LOCAL_TEMP_LIMIT: | |
282 | case TMP51X_REMOTE_TEMP_LIMIT_1: | |
283 | case TMP51X_REMOTE_TEMP_LIMIT_2: | |
284 | case TMP513_REMOTE_TEMP_LIMIT_3: | |
285 | // 1lsb = 0.0625 degrees centigrade | |
286 | val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); | |
287 | regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; | |
288 | break; | |
289 | case TMP51X_N_FACTOR_AND_HYST_1: | |
290 | // 1lsb = 0.5 degrees centigrade | |
291 | val = clamp_val(val, 0, MAX_TEMP_HYST); | |
292 | regval = DIV_ROUND_CLOSEST(val, 500); | |
293 | mask = TMP51X_HYST_MASK; | |
294 | break; | |
295 | default: | |
296 | // Programmer goofed | |
297 | WARN_ON_ONCE(1); | |
298 | return -EOPNOTSUPP; | |
299 | } | |
300 | ||
301 | if (mask == 0) | |
302 | return regmap_write(data->regmap, reg, regval); | |
303 | else | |
304 | return regmap_update_bits(data->regmap, reg, mask, regval); | |
305 | } | |
306 | ||
307 | static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) | |
308 | { | |
309 | switch (type) { | |
310 | case hwmon_temp: | |
311 | switch (attr) { | |
312 | case hwmon_temp_input: | |
313 | return TMP51X_TEMP_INPUT[channel]; | |
314 | case hwmon_temp_crit_alarm: | |
315 | return TMP51X_STATUS; | |
316 | case hwmon_temp_crit: | |
317 | return TMP51X_TEMP_CRIT[channel]; | |
318 | case hwmon_temp_crit_hyst: | |
319 | return TMP51X_TEMP_CRIT_HYST[channel]; | |
320 | } | |
321 | break; | |
322 | case hwmon_in: | |
323 | switch (attr) { | |
324 | case hwmon_in_input: | |
325 | return TMP51X_BUS_VOLTAGE_RESULT; | |
326 | case hwmon_in_lcrit_alarm: | |
327 | case hwmon_in_crit_alarm: | |
328 | return TMP51X_STATUS; | |
329 | case hwmon_in_lcrit: | |
330 | return TMP51X_BUS_VOLTAGE_L_LIMIT; | |
331 | case hwmon_in_crit: | |
332 | return TMP51X_BUS_VOLTAGE_H_LIMIT; | |
333 | } | |
334 | break; | |
335 | case hwmon_curr: | |
336 | switch (attr) { | |
337 | case hwmon_curr_input: | |
338 | return TMP51X_CURR_INPUT[channel]; | |
339 | case hwmon_curr_lcrit_alarm: | |
340 | case hwmon_curr_crit_alarm: | |
341 | return TMP51X_STATUS; | |
342 | case hwmon_curr_lcrit: | |
343 | return TMP51X_SHUNT_CURRENT_L_LIMIT; | |
344 | case hwmon_curr_crit: | |
345 | return TMP51X_SHUNT_CURRENT_H_LIMIT; | |
346 | } | |
347 | break; | |
348 | case hwmon_power: | |
349 | switch (attr) { | |
350 | case hwmon_power_input: | |
351 | return TMP51X_POWER_RESULT; | |
352 | case hwmon_power_crit_alarm: | |
353 | return TMP51X_STATUS; | |
354 | case hwmon_power_crit: | |
355 | return TMP51X_POWER_LIMIT; | |
356 | } | |
357 | break; | |
358 | default: | |
359 | break; | |
360 | } | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, | |
366 | int channel) | |
367 | { | |
368 | switch (type) { | |
369 | case hwmon_temp: | |
370 | switch (attr) { | |
371 | case hwmon_temp_crit_alarm: | |
372 | return TMP51X_TEMP_CRIT_ALARM[channel]; | |
373 | } | |
374 | break; | |
375 | case hwmon_in: | |
376 | switch (attr) { | |
377 | case hwmon_in_lcrit_alarm: | |
378 | return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; | |
379 | case hwmon_in_crit_alarm: | |
380 | return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; | |
381 | } | |
382 | break; | |
383 | case hwmon_curr: | |
384 | switch (attr) { | |
385 | case hwmon_curr_lcrit_alarm: | |
386 | return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; | |
387 | case hwmon_curr_crit_alarm: | |
388 | return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; | |
389 | } | |
390 | break; | |
391 | case hwmon_power: | |
392 | switch (attr) { | |
393 | case hwmon_power_crit_alarm: | |
394 | return TMP51X_POWER_LIMIT_POS; | |
395 | } | |
396 | break; | |
397 | default: | |
398 | break; | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, | |
405 | u32 attr, int channel, long *val) | |
406 | { | |
407 | struct tmp51x_data *data = dev_get_drvdata(dev); | |
408 | int ret; | |
409 | u32 regval; | |
410 | u8 pos = 0, reg = 0; | |
411 | ||
412 | reg = tmp51x_get_reg(type, attr, channel); | |
413 | if (reg == 0) | |
414 | return -EOPNOTSUPP; | |
415 | ||
416 | if (reg == TMP51X_STATUS) | |
417 | pos = tmp51x_get_status_pos(type, attr, channel); | |
418 | ||
419 | ret = regmap_read(data->regmap, reg, ®val); | |
420 | if (ret < 0) | |
421 | return ret; | |
422 | ||
423 | return tmp51x_get_value(data, reg, pos, regval, val); | |
424 | } | |
425 | ||
426 | static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, | |
427 | u32 attr, int channel, long val) | |
428 | { | |
429 | u8 reg = 0; | |
430 | ||
431 | reg = tmp51x_get_reg(type, attr, channel); | |
432 | if (reg == 0) | |
433 | return -EOPNOTSUPP; | |
434 | ||
435 | return tmp51x_set_value(dev_get_drvdata(dev), reg, val); | |
436 | } | |
437 | ||
438 | static umode_t tmp51x_is_visible(const void *_data, | |
439 | enum hwmon_sensor_types type, u32 attr, | |
440 | int channel) | |
441 | { | |
442 | const struct tmp51x_data *data = _data; | |
443 | ||
444 | switch (type) { | |
445 | case hwmon_temp: | |
fb99e07a | 446 | if (channel >= data->max_channels) |
59dfa75e ET |
447 | return 0; |
448 | switch (attr) { | |
449 | case hwmon_temp_input: | |
450 | case hwmon_temp_crit_alarm: | |
451 | return 0444; | |
452 | case hwmon_temp_crit: | |
453 | return 0644; | |
454 | case hwmon_temp_crit_hyst: | |
455 | if (channel == 0) | |
456 | return 0644; | |
457 | return 0444; | |
458 | } | |
459 | break; | |
460 | case hwmon_in: | |
461 | switch (attr) { | |
462 | case hwmon_in_input: | |
463 | case hwmon_in_lcrit_alarm: | |
464 | case hwmon_in_crit_alarm: | |
465 | return 0444; | |
466 | case hwmon_in_lcrit: | |
467 | case hwmon_in_crit: | |
468 | return 0644; | |
469 | } | |
470 | break; | |
471 | case hwmon_curr: | |
472 | if (!data->shunt_uohms) | |
473 | return 0; | |
474 | ||
475 | switch (attr) { | |
476 | case hwmon_curr_input: | |
477 | case hwmon_curr_lcrit_alarm: | |
478 | case hwmon_curr_crit_alarm: | |
479 | return 0444; | |
480 | case hwmon_curr_lcrit: | |
481 | case hwmon_curr_crit: | |
482 | return 0644; | |
483 | } | |
484 | break; | |
485 | case hwmon_power: | |
486 | if (!data->shunt_uohms) | |
487 | return 0; | |
488 | ||
489 | switch (attr) { | |
490 | case hwmon_power_input: | |
491 | case hwmon_power_crit_alarm: | |
492 | return 0444; | |
493 | case hwmon_power_crit: | |
494 | return 0644; | |
495 | } | |
496 | break; | |
497 | default: | |
498 | break; | |
499 | } | |
500 | return 0; | |
501 | } | |
502 | ||
b39c94a1 | 503 | static const struct hwmon_channel_info * const tmp51x_info[] = { |
59dfa75e ET |
504 | HWMON_CHANNEL_INFO(temp, |
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_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | | |
512 | HWMON_T_CRIT_HYST), | |
513 | HWMON_CHANNEL_INFO(in, | |
514 | HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | | |
515 | HWMON_I_CRIT | HWMON_I_CRIT_ALARM), | |
516 | HWMON_CHANNEL_INFO(curr, | |
517 | HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | | |
518 | HWMON_C_CRIT | HWMON_C_CRIT_ALARM, | |
519 | HWMON_C_INPUT), | |
520 | HWMON_CHANNEL_INFO(power, | |
521 | HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), | |
522 | NULL | |
523 | }; | |
524 | ||
525 | static const struct hwmon_ops tmp51x_hwmon_ops = { | |
526 | .is_visible = tmp51x_is_visible, | |
527 | .read = tmp51x_read, | |
528 | .write = tmp51x_write, | |
529 | }; | |
530 | ||
531 | static const struct hwmon_chip_info tmp51x_chip_info = { | |
532 | .ops = &tmp51x_hwmon_ops, | |
533 | .info = tmp51x_info, | |
534 | }; | |
535 | ||
536 | /* | |
537 | * Calibrate the tmp51x following the datasheet method | |
538 | */ | |
539 | static int tmp51x_calibrate(struct tmp51x_data *data) | |
540 | { | |
541 | int vshunt_max = data->pga_gain * 40; | |
542 | u64 max_curr_ma; | |
543 | u32 div; | |
544 | ||
545 | /* | |
546 | * If shunt_uohms is equal to 0, the calibration should be set to 0. | |
547 | * The consequence will be that the current and power measurement engine | |
548 | * of the sensor will not work. Temperature and voltage sensing will | |
549 | * continue to work. | |
550 | */ | |
551 | if (data->shunt_uohms == 0) | |
552 | return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); | |
553 | ||
f07f9d24 | 554 | max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms); |
59dfa75e ET |
555 | |
556 | /* | |
557 | * Calculate the minimal bit resolution for the current and the power. | |
558 | * Those values will be used during register interpretation. | |
559 | */ | |
f07f9d24 | 560 | data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767); |
59dfa75e ET |
561 | data->pwr_lsb_uw = 20 * data->curr_lsb_ua; |
562 | ||
f07f9d24 | 563 | div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO); |
59dfa75e ET |
564 | |
565 | return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, | |
566 | DIV_ROUND_CLOSEST(40960, div)); | |
567 | } | |
568 | ||
569 | /* | |
570 | * Initialize the configuration and calibration registers. | |
571 | */ | |
572 | static int tmp51x_init(struct tmp51x_data *data) | |
573 | { | |
574 | unsigned int regval; | |
575 | int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, | |
576 | data->shunt_config); | |
577 | if (ret < 0) | |
578 | return ret; | |
579 | ||
580 | ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); | |
581 | if (ret < 0) | |
582 | return ret; | |
583 | ||
584 | // nFactor configuration | |
585 | ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, | |
586 | TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); | |
587 | if (ret < 0) | |
588 | return ret; | |
589 | ||
590 | ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, | |
591 | data->nfactor[1] << 8); | |
592 | if (ret < 0) | |
593 | return ret; | |
594 | ||
fb99e07a | 595 | if (data->max_channels == TMP513_MAX_CHANNELS) { |
59dfa75e ET |
596 | ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, |
597 | data->nfactor[2] << 8); | |
598 | if (ret < 0) | |
599 | return ret; | |
600 | } | |
601 | ||
602 | ret = tmp51x_calibrate(data); | |
603 | if (ret < 0) | |
604 | return ret; | |
605 | ||
606 | // Read the status register before using as the datasheet propose | |
607 | return regmap_read(data->regmap, TMP51X_STATUS, ®val); | |
608 | } | |
609 | ||
610 | static const struct i2c_device_id tmp51x_id[] = { | |
fb99e07a BD |
611 | { "tmp512", TMP512_MAX_CHANNELS }, |
612 | { "tmp513", TMP513_MAX_CHANNELS }, | |
59dfa75e ET |
613 | { } |
614 | }; | |
615 | MODULE_DEVICE_TABLE(i2c, tmp51x_id); | |
616 | ||
617 | static const struct of_device_id tmp51x_of_match[] = { | |
fb99e07a BD |
618 | { .compatible = "ti,tmp512", .data = (void *)TMP512_MAX_CHANNELS }, |
619 | { .compatible = "ti,tmp513", .data = (void *)TMP513_MAX_CHANNELS }, | |
620 | { } | |
59dfa75e ET |
621 | }; |
622 | MODULE_DEVICE_TABLE(of, tmp51x_of_match); | |
623 | ||
624 | static int tmp51x_vbus_range_to_reg(struct device *dev, | |
625 | struct tmp51x_data *data) | |
626 | { | |
627 | if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { | |
628 | data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; | |
629 | } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { | |
630 | data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; | |
631 | } else { | |
df989762 AS |
632 | return dev_err_probe(dev, -EINVAL, |
633 | "ti,bus-range-microvolt is invalid: %u\n", | |
634 | data->vbus_range_uvolt); | |
59dfa75e ET |
635 | } |
636 | return 0; | |
637 | } | |
638 | ||
639 | static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) | |
640 | { | |
641 | if (data->pga_gain == 8) { | |
642 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; | |
643 | } else if (data->pga_gain == 4) { | |
644 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; | |
645 | } else if (data->pga_gain == 2) { | |
646 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; | |
647 | } else if (data->pga_gain == 1) { | |
648 | data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; | |
649 | } else { | |
df989762 AS |
650 | return dev_err_probe(dev, -EINVAL, |
651 | "ti,pga-gain is invalid: %u\n", data->pga_gain); | |
59dfa75e ET |
652 | } |
653 | return 0; | |
654 | } | |
655 | ||
656 | static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) | |
657 | { | |
658 | int ret; | |
59dfa75e ET |
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 | ||
27887b06 BD |
676 | device_property_read_u32_array(dev, "ti,nfactor", data->nfactor, |
677 | data->max_channels - 1); | |
59dfa75e ET |
678 | |
679 | // Check if shunt value is compatible with pga-gain | |
f07f9d24 | 680 | if (data->shunt_uohms > data->pga_gain * 40 * MICRO) { |
df989762 AS |
681 | return dev_err_probe(dev, -EINVAL, |
682 | "shunt-resistor: %u too big for pga_gain: %u\n", | |
683 | data->shunt_uohms, data->pga_gain); | |
59dfa75e ET |
684 | } |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | static void tmp51x_use_default(struct tmp51x_data *data) | |
690 | { | |
691 | data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; | |
692 | data->pga_gain = TMP51X_PGA_DEFAULT; | |
693 | data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; | |
694 | } | |
695 | ||
696 | static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) | |
697 | { | |
698 | data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; | |
fb99e07a | 699 | data->temp_config = TMP51X_TEMP_CONFIG_DEFAULT(data->max_channels); |
59dfa75e ET |
700 | |
701 | if (dev->of_node) | |
702 | return tmp51x_read_properties(dev, data); | |
703 | ||
704 | tmp51x_use_default(data); | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
e3b9f691 | 709 | static int tmp51x_probe(struct i2c_client *client) |
59dfa75e ET |
710 | { |
711 | struct device *dev = &client->dev; | |
712 | struct tmp51x_data *data; | |
713 | struct device *hwmon_dev; | |
714 | int ret; | |
715 | ||
716 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
717 | if (!data) | |
718 | return -ENOMEM; | |
719 | ||
fb99e07a | 720 | data->max_channels = (uintptr_t)i2c_get_match_data(client); |
59dfa75e ET |
721 | |
722 | ret = tmp51x_configure(dev, data); | |
df989762 AS |
723 | if (ret < 0) |
724 | return dev_err_probe(dev, ret, "error configuring the device\n"); | |
59dfa75e ET |
725 | |
726 | data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); | |
df989762 AS |
727 | if (IS_ERR(data->regmap)) |
728 | return dev_err_probe(dev, PTR_ERR(data->regmap), | |
729 | "failed to allocate register map\n"); | |
59dfa75e ET |
730 | |
731 | ret = tmp51x_init(data); | |
df989762 AS |
732 | if (ret < 0) |
733 | return dev_err_probe(dev, ret, "error configuring the device\n"); | |
59dfa75e ET |
734 | |
735 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, | |
736 | data, | |
737 | &tmp51x_chip_info, | |
738 | NULL); | |
739 | if (IS_ERR(hwmon_dev)) | |
740 | return PTR_ERR(hwmon_dev); | |
741 | ||
e3b9f691 | 742 | dev_dbg(dev, "power monitor %s\n", client->name); |
59dfa75e ET |
743 | |
744 | return 0; | |
745 | } | |
746 | ||
747 | static struct i2c_driver tmp51x_driver = { | |
748 | .driver = { | |
749 | .name = "tmp51x", | |
00d85e81 | 750 | .of_match_table = tmp51x_of_match, |
59dfa75e | 751 | }, |
1975d167 | 752 | .probe = tmp51x_probe, |
59dfa75e ET |
753 | .id_table = tmp51x_id, |
754 | }; | |
755 | ||
756 | module_i2c_driver(tmp51x_driver); | |
757 | ||
758 | MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); | |
759 | MODULE_DESCRIPTION("tmp51x driver"); | |
760 | MODULE_LICENSE("GPL"); |