Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
86b89d73 | 2 | /* |
6700ce03 GR |
3 | * Driver for Linear Technology LTC2945 I2C Power Monitor |
4 | * | |
5 | * Copyright (c) 2014 Guenter Roeck | |
6700ce03 GR |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/hwmon.h> | |
14 | #include <linux/hwmon-sysfs.h> | |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/regmap.h> | |
17 | ||
18 | /* chip registers */ | |
19 | #define LTC2945_CONTROL 0x00 | |
20 | #define LTC2945_ALERT 0x01 | |
21 | #define LTC2945_STATUS 0x02 | |
22 | #define LTC2945_FAULT 0x03 | |
23 | #define LTC2945_POWER_H 0x05 | |
24 | #define LTC2945_MAX_POWER_H 0x08 | |
25 | #define LTC2945_MIN_POWER_H 0x0b | |
26 | #define LTC2945_MAX_POWER_THRES_H 0x0e | |
27 | #define LTC2945_MIN_POWER_THRES_H 0x11 | |
28 | #define LTC2945_SENSE_H 0x14 | |
29 | #define LTC2945_MAX_SENSE_H 0x16 | |
30 | #define LTC2945_MIN_SENSE_H 0x18 | |
31 | #define LTC2945_MAX_SENSE_THRES_H 0x1a | |
32 | #define LTC2945_MIN_SENSE_THRES_H 0x1c | |
33 | #define LTC2945_VIN_H 0x1e | |
34 | #define LTC2945_MAX_VIN_H 0x20 | |
35 | #define LTC2945_MIN_VIN_H 0x22 | |
36 | #define LTC2945_MAX_VIN_THRES_H 0x24 | |
37 | #define LTC2945_MIN_VIN_THRES_H 0x26 | |
38 | #define LTC2945_ADIN_H 0x28 | |
39 | #define LTC2945_MAX_ADIN_H 0x2a | |
40 | #define LTC2945_MIN_ADIN_H 0x2c | |
41 | #define LTC2945_MAX_ADIN_THRES_H 0x2e | |
42 | #define LTC2945_MIN_ADIN_THRES_H 0x30 | |
43 | #define LTC2945_MIN_ADIN_THRES_L 0x31 | |
44 | ||
45 | /* Fault register bits */ | |
46 | ||
47 | #define FAULT_ADIN_UV (1 << 0) | |
48 | #define FAULT_ADIN_OV (1 << 1) | |
49 | #define FAULT_VIN_UV (1 << 2) | |
50 | #define FAULT_VIN_OV (1 << 3) | |
51 | #define FAULT_SENSE_UV (1 << 4) | |
52 | #define FAULT_SENSE_OV (1 << 5) | |
53 | #define FAULT_POWER_UV (1 << 6) | |
54 | #define FAULT_POWER_OV (1 << 7) | |
55 | ||
56 | /* Control register bits */ | |
57 | ||
58 | #define CONTROL_MULT_SELECT (1 << 0) | |
59 | #define CONTROL_TEST_MODE (1 << 4) | |
60 | ||
4b0654e2 JC |
61 | static const struct of_device_id __maybe_unused ltc2945_of_match[] = { |
62 | { .compatible = "adi,ltc2945" }, | |
63 | { } | |
64 | }; | |
65 | MODULE_DEVICE_TABLE(of, ltc2945_of_match); | |
66 | ||
b11f3d47 JP |
67 | /** |
68 | * struct ltc2945_data - LTC2945 device data | |
69 | * @regmap: regmap device | |
70 | * @shunt_resistor: shunt resistor value in micro ohms (1000 by default) | |
71 | */ | |
72 | struct ltc2945_data { | |
73 | struct regmap *regmap; | |
74 | u32 shunt_resistor; | |
75 | }; | |
76 | ||
6700ce03 GR |
77 | static inline bool is_power_reg(u8 reg) |
78 | { | |
79 | return reg < LTC2945_SENSE_H; | |
80 | } | |
81 | ||
82 | /* Return the value from the given register in uW, mV, or mA */ | |
83 | static long long ltc2945_reg_to_val(struct device *dev, u8 reg) | |
84 | { | |
b11f3d47 JP |
85 | struct ltc2945_data *data = dev_get_drvdata(dev); |
86 | struct regmap *regmap = data->regmap; | |
87 | u32 shunt_resistor = data->shunt_resistor; | |
6700ce03 GR |
88 | unsigned int control; |
89 | u8 buf[3]; | |
90 | long long val; | |
91 | int ret; | |
92 | ||
93 | ret = regmap_bulk_read(regmap, reg, buf, | |
94 | is_power_reg(reg) ? 3 : 2); | |
95 | if (ret < 0) | |
96 | return ret; | |
97 | ||
98 | if (is_power_reg(reg)) { | |
b11f3d47 | 99 | /* 24-bit power */ |
6700ce03 GR |
100 | val = (buf[0] << 16) + (buf[1] << 8) + buf[2]; |
101 | } else { | |
b11f3d47 | 102 | /* 12-bit current, voltage */ |
6700ce03 GR |
103 | val = (buf[0] << 4) + (buf[1] >> 4); |
104 | } | |
105 | ||
106 | switch (reg) { | |
107 | case LTC2945_POWER_H: | |
108 | case LTC2945_MAX_POWER_H: | |
109 | case LTC2945_MIN_POWER_H: | |
110 | case LTC2945_MAX_POWER_THRES_H: | |
111 | case LTC2945_MIN_POWER_THRES_H: | |
112 | /* | |
b11f3d47 | 113 | * Convert to uW |
6700ce03 GR |
114 | * Control register bit 0 selects if voltage at SENSE+/VDD |
115 | * or voltage at ADIN is used to measure power. | |
116 | */ | |
117 | ret = regmap_read(regmap, LTC2945_CONTROL, &control); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | if (control & CONTROL_MULT_SELECT) { | |
121 | /* 25 mV * 25 uV = 0.625 uV resolution. */ | |
122 | val *= 625LL; | |
123 | } else { | |
124 | /* 0.5 mV * 25 uV = 0.0125 uV resolution. */ | |
125 | val = (val * 25LL) >> 1; | |
126 | } | |
b11f3d47 JP |
127 | val *= 1000; |
128 | /* Overflow check: Assuming max 24-bit power, val is at most 53 bits right now. */ | |
129 | val = DIV_ROUND_CLOSEST_ULL(val, shunt_resistor); | |
130 | /* | |
131 | * Overflow check: After division, depending on shunt resistor, | |
132 | * val can still be > 32 bits so returning long long makes sense | |
133 | */ | |
134 | ||
6700ce03 GR |
135 | break; |
136 | case LTC2945_VIN_H: | |
137 | case LTC2945_MAX_VIN_H: | |
138 | case LTC2945_MIN_VIN_H: | |
139 | case LTC2945_MAX_VIN_THRES_H: | |
140 | case LTC2945_MIN_VIN_THRES_H: | |
141 | /* 25 mV resolution. Convert to mV. */ | |
142 | val *= 25; | |
143 | break; | |
144 | case LTC2945_ADIN_H: | |
145 | case LTC2945_MAX_ADIN_H: | |
146 | case LTC2945_MIN_ADIN_THRES_H: | |
147 | case LTC2945_MAX_ADIN_THRES_H: | |
148 | case LTC2945_MIN_ADIN_H: | |
149 | /* 0.5mV resolution. Convert to mV. */ | |
150 | val = val >> 1; | |
151 | break; | |
152 | case LTC2945_SENSE_H: | |
153 | case LTC2945_MAX_SENSE_H: | |
154 | case LTC2945_MIN_SENSE_H: | |
155 | case LTC2945_MAX_SENSE_THRES_H: | |
156 | case LTC2945_MIN_SENSE_THRES_H: | |
b11f3d47 JP |
157 | /* 25 uV resolution. Convert to mA. */ |
158 | val *= 25 * 1000; | |
159 | /* Overflow check: Assuming max 12-bit sense, val is at most 27 bits right now */ | |
160 | val = DIV_ROUND_CLOSEST_ULL(val, shunt_resistor); | |
161 | /* Overflow check: After division, <= 27 bits */ | |
6700ce03 GR |
162 | break; |
163 | default: | |
164 | return -EINVAL; | |
165 | } | |
166 | return val; | |
167 | } | |
168 | ||
b11f3d47 JP |
169 | static long long ltc2945_val_to_reg(struct device *dev, u8 reg, |
170 | unsigned long long val) | |
6700ce03 | 171 | { |
b11f3d47 JP |
172 | struct ltc2945_data *data = dev_get_drvdata(dev); |
173 | struct regmap *regmap = data->regmap; | |
174 | u32 shunt_resistor = data->shunt_resistor; | |
6700ce03 GR |
175 | unsigned int control; |
176 | int ret; | |
177 | ||
b11f3d47 JP |
178 | /* Ensure we don't overflow */ |
179 | val = clamp_val(val, 0, U32_MAX); | |
180 | ||
6700ce03 GR |
181 | switch (reg) { |
182 | case LTC2945_POWER_H: | |
183 | case LTC2945_MAX_POWER_H: | |
184 | case LTC2945_MIN_POWER_H: | |
185 | case LTC2945_MAX_POWER_THRES_H: | |
186 | case LTC2945_MIN_POWER_THRES_H: | |
187 | /* | |
6700ce03 GR |
188 | * Control register bit 0 selects if voltage at SENSE+/VDD |
189 | * or voltage at ADIN is used to measure power, which in turn | |
190 | * determines register calculations. | |
191 | */ | |
192 | ret = regmap_read(regmap, LTC2945_CONTROL, &control); | |
193 | if (ret < 0) | |
194 | return ret; | |
195 | if (control & CONTROL_MULT_SELECT) { | |
196 | /* 25 mV * 25 uV = 0.625 uV resolution. */ | |
b11f3d47 JP |
197 | val *= shunt_resistor; |
198 | /* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */ | |
199 | val = DIV_ROUND_CLOSEST_ULL(val, 625 * 1000); | |
200 | /* Overflow check: val is now <= 44 bits */ | |
6700ce03 | 201 | } else { |
b11f3d47 JP |
202 | /* 0.5 mV * 25 uV = 0.0125 uV resolution. */ |
203 | val *= shunt_resistor; | |
204 | /* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */ | |
205 | val = DIV_ROUND_CLOSEST_ULL(val, 25 * 1000) * 2; | |
206 | /* Overflow check: val is now <= 51 bits */ | |
6700ce03 GR |
207 | } |
208 | break; | |
209 | case LTC2945_VIN_H: | |
210 | case LTC2945_MAX_VIN_H: | |
211 | case LTC2945_MIN_VIN_H: | |
212 | case LTC2945_MAX_VIN_THRES_H: | |
213 | case LTC2945_MIN_VIN_THRES_H: | |
214 | /* 25 mV resolution. */ | |
b11f3d47 | 215 | val = DIV_ROUND_CLOSEST_ULL(val, 25); |
6700ce03 GR |
216 | break; |
217 | case LTC2945_ADIN_H: | |
218 | case LTC2945_MAX_ADIN_H: | |
219 | case LTC2945_MIN_ADIN_THRES_H: | |
220 | case LTC2945_MAX_ADIN_THRES_H: | |
221 | case LTC2945_MIN_ADIN_H: | |
222 | /* 0.5mV resolution. */ | |
223 | val *= 2; | |
224 | break; | |
225 | case LTC2945_SENSE_H: | |
226 | case LTC2945_MAX_SENSE_H: | |
227 | case LTC2945_MIN_SENSE_H: | |
228 | case LTC2945_MAX_SENSE_THRES_H: | |
229 | case LTC2945_MIN_SENSE_THRES_H: | |
b11f3d47 JP |
230 | /* 25 uV resolution. Convert to mA. */ |
231 | val *= shunt_resistor; | |
232 | /* Overflow check: Assuming 32-bit val and 32-bit shunt resistor, val is 64bits */ | |
233 | val = DIV_ROUND_CLOSEST_ULL(val, 25 * 1000); | |
234 | /* Overflow check: val is now <= 50 bits */ | |
6700ce03 GR |
235 | break; |
236 | default: | |
237 | return -EINVAL; | |
238 | } | |
239 | return val; | |
240 | } | |
241 | ||
5614e26d | 242 | static ssize_t ltc2945_value_show(struct device *dev, |
6700ce03 GR |
243 | struct device_attribute *da, char *buf) |
244 | { | |
245 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
246 | long long value; | |
247 | ||
248 | value = ltc2945_reg_to_val(dev, attr->index); | |
249 | if (value < 0) | |
250 | return value; | |
1f4d4af4 | 251 | return sysfs_emit(buf, "%lld\n", value); |
6700ce03 GR |
252 | } |
253 | ||
5614e26d GR |
254 | static ssize_t ltc2945_value_store(struct device *dev, |
255 | struct device_attribute *da, | |
256 | const char *buf, size_t count) | |
6700ce03 GR |
257 | { |
258 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
b11f3d47 JP |
259 | struct ltc2945_data *data = dev_get_drvdata(dev); |
260 | struct regmap *regmap = data->regmap; | |
6700ce03 | 261 | u8 reg = attr->index; |
b11f3d47 | 262 | unsigned int val; |
6700ce03 GR |
263 | u8 regbuf[3]; |
264 | int num_regs; | |
b11f3d47 | 265 | long long regval; |
6700ce03 GR |
266 | int ret; |
267 | ||
b11f3d47 | 268 | ret = kstrtouint(buf, 10, &val); |
6700ce03 GR |
269 | if (ret) |
270 | return ret; | |
271 | ||
272 | /* convert to register value, then clamp and write result */ | |
273 | regval = ltc2945_val_to_reg(dev, reg, val); | |
178b01ec JC |
274 | if (regval < 0) |
275 | return regval; | |
6700ce03 GR |
276 | if (is_power_reg(reg)) { |
277 | regval = clamp_val(regval, 0, 0xffffff); | |
278 | regbuf[0] = regval >> 16; | |
279 | regbuf[1] = (regval >> 8) & 0xff; | |
280 | regbuf[2] = regval; | |
281 | num_regs = 3; | |
282 | } else { | |
283 | regval = clamp_val(regval, 0, 0xfff) << 4; | |
284 | regbuf[0] = regval >> 8; | |
285 | regbuf[1] = regval & 0xff; | |
286 | num_regs = 2; | |
287 | } | |
288 | ret = regmap_bulk_write(regmap, reg, regbuf, num_regs); | |
289 | return ret < 0 ? ret : count; | |
290 | } | |
291 | ||
5614e26d | 292 | static ssize_t ltc2945_history_store(struct device *dev, |
6700ce03 GR |
293 | struct device_attribute *da, |
294 | const char *buf, size_t count) | |
295 | { | |
296 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
b11f3d47 JP |
297 | struct ltc2945_data *data = dev_get_drvdata(dev); |
298 | struct regmap *regmap = data->regmap; | |
6700ce03 GR |
299 | u8 reg = attr->index; |
300 | int num_regs = is_power_reg(reg) ? 3 : 2; | |
301 | u8 buf_min[3] = { 0xff, 0xff, 0xff }; | |
302 | u8 buf_max[3] = { 0, 0, 0 }; | |
303 | unsigned long val; | |
304 | int ret; | |
305 | ||
306 | ret = kstrtoul(buf, 10, &val); | |
307 | if (ret) | |
308 | return ret; | |
309 | if (val != 1) | |
310 | return -EINVAL; | |
311 | ||
312 | ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, | |
313 | CONTROL_TEST_MODE); | |
314 | ||
315 | /* Reset minimum */ | |
316 | ret = regmap_bulk_write(regmap, reg, buf_min, num_regs); | |
317 | if (ret) | |
318 | return ret; | |
319 | ||
320 | switch (reg) { | |
321 | case LTC2945_MIN_POWER_H: | |
322 | reg = LTC2945_MAX_POWER_H; | |
323 | break; | |
324 | case LTC2945_MIN_SENSE_H: | |
325 | reg = LTC2945_MAX_SENSE_H; | |
326 | break; | |
327 | case LTC2945_MIN_VIN_H: | |
328 | reg = LTC2945_MAX_VIN_H; | |
329 | break; | |
330 | case LTC2945_MIN_ADIN_H: | |
331 | reg = LTC2945_MAX_ADIN_H; | |
332 | break; | |
333 | default: | |
f75d7230 GR |
334 | WARN_ONCE(1, "Bad register: 0x%x\n", reg); |
335 | return -EINVAL; | |
6700ce03 GR |
336 | } |
337 | /* Reset maximum */ | |
338 | ret = regmap_bulk_write(regmap, reg, buf_max, num_regs); | |
339 | ||
340 | /* Try resetting test mode even if there was an error */ | |
341 | regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0); | |
342 | ||
343 | return ret ? : count; | |
344 | } | |
345 | ||
5614e26d | 346 | static ssize_t ltc2945_bool_show(struct device *dev, |
6700ce03 GR |
347 | struct device_attribute *da, char *buf) |
348 | { | |
349 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
b11f3d47 JP |
350 | struct ltc2945_data *data = dev_get_drvdata(dev); |
351 | struct regmap *regmap = data->regmap; | |
6700ce03 GR |
352 | unsigned int fault; |
353 | int ret; | |
354 | ||
355 | ret = regmap_read(regmap, LTC2945_FAULT, &fault); | |
356 | if (ret < 0) | |
357 | return ret; | |
358 | ||
359 | fault &= attr->index; | |
360 | if (fault) /* Clear reported faults in chip register */ | |
361 | regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0); | |
362 | ||
1f4d4af4 | 363 | return sysfs_emit(buf, "%d\n", !!fault); |
6700ce03 GR |
364 | } |
365 | ||
366 | /* Input voltages */ | |
367 | ||
5614e26d GR |
368 | static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2945_value, LTC2945_VIN_H); |
369 | static SENSOR_DEVICE_ATTR_RW(in1_min, ltc2945_value, LTC2945_MIN_VIN_THRES_H); | |
370 | static SENSOR_DEVICE_ATTR_RW(in1_max, ltc2945_value, LTC2945_MAX_VIN_THRES_H); | |
371 | static SENSOR_DEVICE_ATTR_RO(in1_lowest, ltc2945_value, LTC2945_MIN_VIN_H); | |
372 | static SENSOR_DEVICE_ATTR_RO(in1_highest, ltc2945_value, LTC2945_MAX_VIN_H); | |
373 | static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ltc2945_history, | |
374 | LTC2945_MIN_VIN_H); | |
375 | ||
376 | static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2945_value, LTC2945_ADIN_H); | |
377 | static SENSOR_DEVICE_ATTR_RW(in2_min, ltc2945_value, LTC2945_MIN_ADIN_THRES_H); | |
378 | static SENSOR_DEVICE_ATTR_RW(in2_max, ltc2945_value, LTC2945_MAX_ADIN_THRES_H); | |
379 | static SENSOR_DEVICE_ATTR_RO(in2_lowest, ltc2945_value, LTC2945_MIN_ADIN_H); | |
380 | static SENSOR_DEVICE_ATTR_RO(in2_highest, ltc2945_value, LTC2945_MAX_ADIN_H); | |
381 | static SENSOR_DEVICE_ATTR_WO(in2_reset_history, ltc2945_history, | |
382 | LTC2945_MIN_ADIN_H); | |
6700ce03 GR |
383 | |
384 | /* Voltage alarms */ | |
385 | ||
5614e26d GR |
386 | static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc2945_bool, FAULT_VIN_UV); |
387 | static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc2945_bool, FAULT_VIN_OV); | |
388 | static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc2945_bool, FAULT_ADIN_UV); | |
389 | static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc2945_bool, FAULT_ADIN_OV); | |
6700ce03 GR |
390 | |
391 | /* Currents (via sense resistor) */ | |
392 | ||
5614e26d GR |
393 | static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2945_value, LTC2945_SENSE_H); |
394 | static SENSOR_DEVICE_ATTR_RW(curr1_min, ltc2945_value, | |
395 | LTC2945_MIN_SENSE_THRES_H); | |
396 | static SENSOR_DEVICE_ATTR_RW(curr1_max, ltc2945_value, | |
397 | LTC2945_MAX_SENSE_THRES_H); | |
398 | static SENSOR_DEVICE_ATTR_RO(curr1_lowest, ltc2945_value, LTC2945_MIN_SENSE_H); | |
399 | static SENSOR_DEVICE_ATTR_RO(curr1_highest, ltc2945_value, | |
400 | LTC2945_MAX_SENSE_H); | |
401 | static SENSOR_DEVICE_ATTR_WO(curr1_reset_history, ltc2945_history, | |
402 | LTC2945_MIN_SENSE_H); | |
6700ce03 GR |
403 | |
404 | /* Current alarms */ | |
405 | ||
5614e26d GR |
406 | static SENSOR_DEVICE_ATTR_RO(curr1_min_alarm, ltc2945_bool, FAULT_SENSE_UV); |
407 | static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc2945_bool, FAULT_SENSE_OV); | |
6700ce03 GR |
408 | |
409 | /* Power */ | |
410 | ||
5614e26d GR |
411 | static SENSOR_DEVICE_ATTR_RO(power1_input, ltc2945_value, LTC2945_POWER_H); |
412 | static SENSOR_DEVICE_ATTR_RW(power1_min, ltc2945_value, | |
413 | LTC2945_MIN_POWER_THRES_H); | |
414 | static SENSOR_DEVICE_ATTR_RW(power1_max, ltc2945_value, | |
415 | LTC2945_MAX_POWER_THRES_H); | |
416 | static SENSOR_DEVICE_ATTR_RO(power1_input_lowest, ltc2945_value, | |
417 | LTC2945_MIN_POWER_H); | |
418 | static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ltc2945_value, | |
419 | LTC2945_MAX_POWER_H); | |
420 | static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ltc2945_history, | |
421 | LTC2945_MIN_POWER_H); | |
6700ce03 GR |
422 | |
423 | /* Power alarms */ | |
424 | ||
5614e26d GR |
425 | static SENSOR_DEVICE_ATTR_RO(power1_min_alarm, ltc2945_bool, FAULT_POWER_UV); |
426 | static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ltc2945_bool, FAULT_POWER_OV); | |
6700ce03 GR |
427 | |
428 | static struct attribute *ltc2945_attrs[] = { | |
429 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
430 | &sensor_dev_attr_in1_min.dev_attr.attr, | |
431 | &sensor_dev_attr_in1_max.dev_attr.attr, | |
432 | &sensor_dev_attr_in1_lowest.dev_attr.attr, | |
433 | &sensor_dev_attr_in1_highest.dev_attr.attr, | |
434 | &sensor_dev_attr_in1_reset_history.dev_attr.attr, | |
435 | &sensor_dev_attr_in1_min_alarm.dev_attr.attr, | |
436 | &sensor_dev_attr_in1_max_alarm.dev_attr.attr, | |
437 | ||
438 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
439 | &sensor_dev_attr_in2_min.dev_attr.attr, | |
440 | &sensor_dev_attr_in2_max.dev_attr.attr, | |
441 | &sensor_dev_attr_in2_lowest.dev_attr.attr, | |
442 | &sensor_dev_attr_in2_highest.dev_attr.attr, | |
443 | &sensor_dev_attr_in2_reset_history.dev_attr.attr, | |
444 | &sensor_dev_attr_in2_min_alarm.dev_attr.attr, | |
445 | &sensor_dev_attr_in2_max_alarm.dev_attr.attr, | |
446 | ||
447 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
448 | &sensor_dev_attr_curr1_min.dev_attr.attr, | |
449 | &sensor_dev_attr_curr1_max.dev_attr.attr, | |
450 | &sensor_dev_attr_curr1_lowest.dev_attr.attr, | |
451 | &sensor_dev_attr_curr1_highest.dev_attr.attr, | |
452 | &sensor_dev_attr_curr1_reset_history.dev_attr.attr, | |
453 | &sensor_dev_attr_curr1_min_alarm.dev_attr.attr, | |
454 | &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, | |
455 | ||
456 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
457 | &sensor_dev_attr_power1_min.dev_attr.attr, | |
458 | &sensor_dev_attr_power1_max.dev_attr.attr, | |
459 | &sensor_dev_attr_power1_input_lowest.dev_attr.attr, | |
460 | &sensor_dev_attr_power1_input_highest.dev_attr.attr, | |
461 | &sensor_dev_attr_power1_reset_history.dev_attr.attr, | |
462 | &sensor_dev_attr_power1_min_alarm.dev_attr.attr, | |
463 | &sensor_dev_attr_power1_max_alarm.dev_attr.attr, | |
464 | ||
465 | NULL, | |
466 | }; | |
467 | ATTRIBUTE_GROUPS(ltc2945); | |
468 | ||
034b44b4 | 469 | static const struct regmap_config ltc2945_regmap_config = { |
6700ce03 GR |
470 | .reg_bits = 8, |
471 | .val_bits = 8, | |
472 | .max_register = LTC2945_MIN_ADIN_THRES_L, | |
473 | }; | |
474 | ||
67487038 | 475 | static int ltc2945_probe(struct i2c_client *client) |
6700ce03 GR |
476 | { |
477 | struct device *dev = &client->dev; | |
478 | struct device *hwmon_dev; | |
479 | struct regmap *regmap; | |
b11f3d47 JP |
480 | struct ltc2945_data *data; |
481 | ||
482 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
483 | if (!data) | |
484 | return -ENOMEM; | |
485 | dev_set_drvdata(dev, data); | |
6700ce03 GR |
486 | |
487 | regmap = devm_regmap_init_i2c(client, <c2945_regmap_config); | |
488 | if (IS_ERR(regmap)) { | |
489 | dev_err(dev, "failed to allocate register map\n"); | |
490 | return PTR_ERR(regmap); | |
491 | } | |
492 | ||
b11f3d47 JP |
493 | data->regmap = regmap; |
494 | if (device_property_read_u32(dev, "shunt-resistor-micro-ohms", | |
495 | &data->shunt_resistor)) | |
496 | data->shunt_resistor = 1000; | |
497 | ||
498 | if (data->shunt_resistor == 0) | |
499 | return -EINVAL; | |
500 | ||
6700ce03 GR |
501 | /* Clear faults */ |
502 | regmap_write(regmap, LTC2945_FAULT, 0x00); | |
503 | ||
504 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, | |
b11f3d47 | 505 | data, |
6700ce03 GR |
506 | ltc2945_groups); |
507 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
508 | } | |
509 | ||
510 | static const struct i2c_device_id ltc2945_id[] = { | |
d8a66f36 | 511 | {"ltc2945"}, |
6700ce03 GR |
512 | { } |
513 | }; | |
514 | ||
515 | MODULE_DEVICE_TABLE(i2c, ltc2945_id); | |
516 | ||
517 | static struct i2c_driver ltc2945_driver = { | |
518 | .driver = { | |
4b0654e2 JC |
519 | .name = "ltc2945", |
520 | .of_match_table = of_match_ptr(ltc2945_of_match), | |
521 | }, | |
1975d167 | 522 | .probe = ltc2945_probe, |
6700ce03 GR |
523 | .id_table = ltc2945_id, |
524 | }; | |
525 | ||
526 | module_i2c_driver(ltc2945_driver); | |
527 | ||
528 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); | |
529 | MODULE_DESCRIPTION("LTC2945 driver"); | |
530 | MODULE_LICENSE("GPL"); |