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6700ce03 GR |
1 | /* |
2 | * Driver for Linear Technology LTC2945 I2C Power Monitor | |
3 | * | |
4 | * Copyright (c) 2014 Guenter Roeck | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/i2c.h> | |
22 | #include <linux/hwmon.h> | |
23 | #include <linux/hwmon-sysfs.h> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/regmap.h> | |
26 | ||
27 | /* chip registers */ | |
28 | #define LTC2945_CONTROL 0x00 | |
29 | #define LTC2945_ALERT 0x01 | |
30 | #define LTC2945_STATUS 0x02 | |
31 | #define LTC2945_FAULT 0x03 | |
32 | #define LTC2945_POWER_H 0x05 | |
33 | #define LTC2945_MAX_POWER_H 0x08 | |
34 | #define LTC2945_MIN_POWER_H 0x0b | |
35 | #define LTC2945_MAX_POWER_THRES_H 0x0e | |
36 | #define LTC2945_MIN_POWER_THRES_H 0x11 | |
37 | #define LTC2945_SENSE_H 0x14 | |
38 | #define LTC2945_MAX_SENSE_H 0x16 | |
39 | #define LTC2945_MIN_SENSE_H 0x18 | |
40 | #define LTC2945_MAX_SENSE_THRES_H 0x1a | |
41 | #define LTC2945_MIN_SENSE_THRES_H 0x1c | |
42 | #define LTC2945_VIN_H 0x1e | |
43 | #define LTC2945_MAX_VIN_H 0x20 | |
44 | #define LTC2945_MIN_VIN_H 0x22 | |
45 | #define LTC2945_MAX_VIN_THRES_H 0x24 | |
46 | #define LTC2945_MIN_VIN_THRES_H 0x26 | |
47 | #define LTC2945_ADIN_H 0x28 | |
48 | #define LTC2945_MAX_ADIN_H 0x2a | |
49 | #define LTC2945_MIN_ADIN_H 0x2c | |
50 | #define LTC2945_MAX_ADIN_THRES_H 0x2e | |
51 | #define LTC2945_MIN_ADIN_THRES_H 0x30 | |
52 | #define LTC2945_MIN_ADIN_THRES_L 0x31 | |
53 | ||
54 | /* Fault register bits */ | |
55 | ||
56 | #define FAULT_ADIN_UV (1 << 0) | |
57 | #define FAULT_ADIN_OV (1 << 1) | |
58 | #define FAULT_VIN_UV (1 << 2) | |
59 | #define FAULT_VIN_OV (1 << 3) | |
60 | #define FAULT_SENSE_UV (1 << 4) | |
61 | #define FAULT_SENSE_OV (1 << 5) | |
62 | #define FAULT_POWER_UV (1 << 6) | |
63 | #define FAULT_POWER_OV (1 << 7) | |
64 | ||
65 | /* Control register bits */ | |
66 | ||
67 | #define CONTROL_MULT_SELECT (1 << 0) | |
68 | #define CONTROL_TEST_MODE (1 << 4) | |
69 | ||
70 | static inline bool is_power_reg(u8 reg) | |
71 | { | |
72 | return reg < LTC2945_SENSE_H; | |
73 | } | |
74 | ||
75 | /* Return the value from the given register in uW, mV, or mA */ | |
76 | static long long ltc2945_reg_to_val(struct device *dev, u8 reg) | |
77 | { | |
78 | struct regmap *regmap = dev_get_drvdata(dev); | |
79 | unsigned int control; | |
80 | u8 buf[3]; | |
81 | long long val; | |
82 | int ret; | |
83 | ||
84 | ret = regmap_bulk_read(regmap, reg, buf, | |
85 | is_power_reg(reg) ? 3 : 2); | |
86 | if (ret < 0) | |
87 | return ret; | |
88 | ||
89 | if (is_power_reg(reg)) { | |
90 | /* power */ | |
91 | val = (buf[0] << 16) + (buf[1] << 8) + buf[2]; | |
92 | } else { | |
93 | /* current, voltage */ | |
94 | val = (buf[0] << 4) + (buf[1] >> 4); | |
95 | } | |
96 | ||
97 | switch (reg) { | |
98 | case LTC2945_POWER_H: | |
99 | case LTC2945_MAX_POWER_H: | |
100 | case LTC2945_MIN_POWER_H: | |
101 | case LTC2945_MAX_POWER_THRES_H: | |
102 | case LTC2945_MIN_POWER_THRES_H: | |
103 | /* | |
104 | * Convert to uW by assuming current is measured with | |
105 | * an 1mOhm sense resistor, similar to current | |
106 | * measurements. | |
107 | * Control register bit 0 selects if voltage at SENSE+/VDD | |
108 | * or voltage at ADIN is used to measure power. | |
109 | */ | |
110 | ret = regmap_read(regmap, LTC2945_CONTROL, &control); | |
111 | if (ret < 0) | |
112 | return ret; | |
113 | if (control & CONTROL_MULT_SELECT) { | |
114 | /* 25 mV * 25 uV = 0.625 uV resolution. */ | |
115 | val *= 625LL; | |
116 | } else { | |
117 | /* 0.5 mV * 25 uV = 0.0125 uV resolution. */ | |
118 | val = (val * 25LL) >> 1; | |
119 | } | |
120 | break; | |
121 | case LTC2945_VIN_H: | |
122 | case LTC2945_MAX_VIN_H: | |
123 | case LTC2945_MIN_VIN_H: | |
124 | case LTC2945_MAX_VIN_THRES_H: | |
125 | case LTC2945_MIN_VIN_THRES_H: | |
126 | /* 25 mV resolution. Convert to mV. */ | |
127 | val *= 25; | |
128 | break; | |
129 | case LTC2945_ADIN_H: | |
130 | case LTC2945_MAX_ADIN_H: | |
131 | case LTC2945_MIN_ADIN_THRES_H: | |
132 | case LTC2945_MAX_ADIN_THRES_H: | |
133 | case LTC2945_MIN_ADIN_H: | |
134 | /* 0.5mV resolution. Convert to mV. */ | |
135 | val = val >> 1; | |
136 | break; | |
137 | case LTC2945_SENSE_H: | |
138 | case LTC2945_MAX_SENSE_H: | |
139 | case LTC2945_MIN_SENSE_H: | |
140 | case LTC2945_MAX_SENSE_THRES_H: | |
141 | case LTC2945_MIN_SENSE_THRES_H: | |
142 | /* | |
143 | * 25 uV resolution. Convert to current as measured with | |
144 | * an 1 mOhm sense resistor, in mA. If a different sense | |
145 | * resistor is installed, calculate the actual current by | |
146 | * dividing the reported current by the sense resistor value | |
147 | * in mOhm. | |
148 | */ | |
149 | val *= 25; | |
150 | break; | |
151 | default: | |
152 | return -EINVAL; | |
153 | } | |
154 | return val; | |
155 | } | |
156 | ||
157 | static int ltc2945_val_to_reg(struct device *dev, u8 reg, | |
158 | unsigned long val) | |
159 | { | |
160 | struct regmap *regmap = dev_get_drvdata(dev); | |
161 | unsigned int control; | |
162 | int ret; | |
163 | ||
164 | switch (reg) { | |
165 | case LTC2945_POWER_H: | |
166 | case LTC2945_MAX_POWER_H: | |
167 | case LTC2945_MIN_POWER_H: | |
168 | case LTC2945_MAX_POWER_THRES_H: | |
169 | case LTC2945_MIN_POWER_THRES_H: | |
170 | /* | |
171 | * Convert to register value by assuming current is measured | |
172 | * with an 1mOhm sense resistor, similar to current | |
173 | * measurements. | |
174 | * Control register bit 0 selects if voltage at SENSE+/VDD | |
175 | * or voltage at ADIN is used to measure power, which in turn | |
176 | * determines register calculations. | |
177 | */ | |
178 | ret = regmap_read(regmap, LTC2945_CONTROL, &control); | |
179 | if (ret < 0) | |
180 | return ret; | |
181 | if (control & CONTROL_MULT_SELECT) { | |
182 | /* 25 mV * 25 uV = 0.625 uV resolution. */ | |
183 | val = DIV_ROUND_CLOSEST(val, 625); | |
184 | } else { | |
185 | /* | |
186 | * 0.5 mV * 25 uV = 0.0125 uV resolution. | |
187 | * Divide first to avoid overflow; | |
188 | * accept loss of accuracy. | |
189 | */ | |
190 | val = DIV_ROUND_CLOSEST(val, 25) * 2; | |
191 | } | |
192 | break; | |
193 | case LTC2945_VIN_H: | |
194 | case LTC2945_MAX_VIN_H: | |
195 | case LTC2945_MIN_VIN_H: | |
196 | case LTC2945_MAX_VIN_THRES_H: | |
197 | case LTC2945_MIN_VIN_THRES_H: | |
198 | /* 25 mV resolution. */ | |
199 | val /= 25; | |
200 | break; | |
201 | case LTC2945_ADIN_H: | |
202 | case LTC2945_MAX_ADIN_H: | |
203 | case LTC2945_MIN_ADIN_THRES_H: | |
204 | case LTC2945_MAX_ADIN_THRES_H: | |
205 | case LTC2945_MIN_ADIN_H: | |
206 | /* 0.5mV resolution. */ | |
207 | val *= 2; | |
208 | break; | |
209 | case LTC2945_SENSE_H: | |
210 | case LTC2945_MAX_SENSE_H: | |
211 | case LTC2945_MIN_SENSE_H: | |
212 | case LTC2945_MAX_SENSE_THRES_H: | |
213 | case LTC2945_MIN_SENSE_THRES_H: | |
214 | /* | |
215 | * 25 uV resolution. Convert to current as measured with | |
216 | * an 1 mOhm sense resistor, in mA. If a different sense | |
217 | * resistor is installed, calculate the actual current by | |
218 | * dividing the reported current by the sense resistor value | |
219 | * in mOhm. | |
220 | */ | |
221 | val = DIV_ROUND_CLOSEST(val, 25); | |
222 | break; | |
223 | default: | |
224 | return -EINVAL; | |
225 | } | |
226 | return val; | |
227 | } | |
228 | ||
229 | static ssize_t ltc2945_show_value(struct device *dev, | |
230 | struct device_attribute *da, char *buf) | |
231 | { | |
232 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
233 | long long value; | |
234 | ||
235 | value = ltc2945_reg_to_val(dev, attr->index); | |
236 | if (value < 0) | |
237 | return value; | |
238 | return snprintf(buf, PAGE_SIZE, "%lld\n", value); | |
239 | } | |
240 | ||
241 | static ssize_t ltc2945_set_value(struct device *dev, | |
242 | struct device_attribute *da, | |
243 | const char *buf, size_t count) | |
244 | { | |
245 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
246 | struct regmap *regmap = dev_get_drvdata(dev); | |
247 | u8 reg = attr->index; | |
248 | unsigned long val; | |
249 | u8 regbuf[3]; | |
250 | int num_regs; | |
251 | int regval; | |
252 | int ret; | |
253 | ||
254 | ret = kstrtoul(buf, 10, &val); | |
255 | if (ret) | |
256 | return ret; | |
257 | ||
258 | /* convert to register value, then clamp and write result */ | |
259 | regval = ltc2945_val_to_reg(dev, reg, val); | |
260 | if (is_power_reg(reg)) { | |
261 | regval = clamp_val(regval, 0, 0xffffff); | |
262 | regbuf[0] = regval >> 16; | |
263 | regbuf[1] = (regval >> 8) & 0xff; | |
264 | regbuf[2] = regval; | |
265 | num_regs = 3; | |
266 | } else { | |
267 | regval = clamp_val(regval, 0, 0xfff) << 4; | |
268 | regbuf[0] = regval >> 8; | |
269 | regbuf[1] = regval & 0xff; | |
270 | num_regs = 2; | |
271 | } | |
272 | ret = regmap_bulk_write(regmap, reg, regbuf, num_regs); | |
273 | return ret < 0 ? ret : count; | |
274 | } | |
275 | ||
276 | static ssize_t ltc2945_reset_history(struct device *dev, | |
277 | struct device_attribute *da, | |
278 | const char *buf, size_t count) | |
279 | { | |
280 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
281 | struct regmap *regmap = dev_get_drvdata(dev); | |
282 | u8 reg = attr->index; | |
283 | int num_regs = is_power_reg(reg) ? 3 : 2; | |
284 | u8 buf_min[3] = { 0xff, 0xff, 0xff }; | |
285 | u8 buf_max[3] = { 0, 0, 0 }; | |
286 | unsigned long val; | |
287 | int ret; | |
288 | ||
289 | ret = kstrtoul(buf, 10, &val); | |
290 | if (ret) | |
291 | return ret; | |
292 | if (val != 1) | |
293 | return -EINVAL; | |
294 | ||
295 | ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, | |
296 | CONTROL_TEST_MODE); | |
297 | ||
298 | /* Reset minimum */ | |
299 | ret = regmap_bulk_write(regmap, reg, buf_min, num_regs); | |
300 | if (ret) | |
301 | return ret; | |
302 | ||
303 | switch (reg) { | |
304 | case LTC2945_MIN_POWER_H: | |
305 | reg = LTC2945_MAX_POWER_H; | |
306 | break; | |
307 | case LTC2945_MIN_SENSE_H: | |
308 | reg = LTC2945_MAX_SENSE_H; | |
309 | break; | |
310 | case LTC2945_MIN_VIN_H: | |
311 | reg = LTC2945_MAX_VIN_H; | |
312 | break; | |
313 | case LTC2945_MIN_ADIN_H: | |
314 | reg = LTC2945_MAX_ADIN_H; | |
315 | break; | |
316 | default: | |
317 | BUG(); | |
318 | break; | |
319 | } | |
320 | /* Reset maximum */ | |
321 | ret = regmap_bulk_write(regmap, reg, buf_max, num_regs); | |
322 | ||
323 | /* Try resetting test mode even if there was an error */ | |
324 | regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0); | |
325 | ||
326 | return ret ? : count; | |
327 | } | |
328 | ||
329 | static ssize_t ltc2945_show_bool(struct device *dev, | |
330 | struct device_attribute *da, char *buf) | |
331 | { | |
332 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
333 | struct regmap *regmap = dev_get_drvdata(dev); | |
334 | unsigned int fault; | |
335 | int ret; | |
336 | ||
337 | ret = regmap_read(regmap, LTC2945_FAULT, &fault); | |
338 | if (ret < 0) | |
339 | return ret; | |
340 | ||
341 | fault &= attr->index; | |
342 | if (fault) /* Clear reported faults in chip register */ | |
343 | regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0); | |
344 | ||
345 | return snprintf(buf, PAGE_SIZE, "%d\n", !!fault); | |
346 | } | |
347 | ||
348 | /* Input voltages */ | |
349 | ||
350 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc2945_show_value, NULL, | |
351 | LTC2945_VIN_H); | |
352 | static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
353 | ltc2945_set_value, LTC2945_MIN_VIN_THRES_H); | |
354 | static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
355 | ltc2945_set_value, LTC2945_MAX_VIN_THRES_H); | |
356 | static SENSOR_DEVICE_ATTR(in1_lowest, S_IRUGO, ltc2945_show_value, NULL, | |
357 | LTC2945_MIN_VIN_H); | |
358 | static SENSOR_DEVICE_ATTR(in1_highest, S_IRUGO, ltc2945_show_value, NULL, | |
359 | LTC2945_MAX_VIN_H); | |
360 | static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL, | |
361 | ltc2945_reset_history, LTC2945_MIN_VIN_H); | |
362 | ||
363 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc2945_show_value, NULL, | |
364 | LTC2945_ADIN_H); | |
365 | static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
366 | ltc2945_set_value, LTC2945_MIN_ADIN_THRES_H); | |
367 | static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
368 | ltc2945_set_value, LTC2945_MAX_ADIN_THRES_H); | |
369 | static SENSOR_DEVICE_ATTR(in2_lowest, S_IRUGO, ltc2945_show_value, NULL, | |
370 | LTC2945_MIN_ADIN_H); | |
371 | static SENSOR_DEVICE_ATTR(in2_highest, S_IRUGO, ltc2945_show_value, NULL, | |
372 | LTC2945_MAX_ADIN_H); | |
373 | static SENSOR_DEVICE_ATTR(in2_reset_history, S_IWUSR, NULL, | |
374 | ltc2945_reset_history, LTC2945_MIN_ADIN_H); | |
375 | ||
376 | /* Voltage alarms */ | |
377 | ||
378 | static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
379 | FAULT_VIN_UV); | |
380 | static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
381 | FAULT_VIN_OV); | |
382 | static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
383 | FAULT_ADIN_UV); | |
384 | static SENSOR_DEVICE_ATTR(in2_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
385 | FAULT_ADIN_OV); | |
386 | ||
387 | /* Currents (via sense resistor) */ | |
388 | ||
389 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc2945_show_value, NULL, | |
390 | LTC2945_SENSE_H); | |
391 | static SENSOR_DEVICE_ATTR(curr1_min, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
392 | ltc2945_set_value, LTC2945_MIN_SENSE_THRES_H); | |
393 | static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
394 | ltc2945_set_value, LTC2945_MAX_SENSE_THRES_H); | |
395 | static SENSOR_DEVICE_ATTR(curr1_lowest, S_IRUGO, ltc2945_show_value, NULL, | |
396 | LTC2945_MIN_SENSE_H); | |
397 | static SENSOR_DEVICE_ATTR(curr1_highest, S_IRUGO, ltc2945_show_value, NULL, | |
398 | LTC2945_MAX_SENSE_H); | |
399 | static SENSOR_DEVICE_ATTR(curr1_reset_history, S_IWUSR, NULL, | |
400 | ltc2945_reset_history, LTC2945_MIN_SENSE_H); | |
401 | ||
402 | /* Current alarms */ | |
403 | ||
404 | static SENSOR_DEVICE_ATTR(curr1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
405 | FAULT_SENSE_UV); | |
406 | static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
407 | FAULT_SENSE_OV); | |
408 | ||
409 | /* Power */ | |
410 | ||
411 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc2945_show_value, NULL, | |
412 | LTC2945_POWER_H); | |
413 | static SENSOR_DEVICE_ATTR(power1_min, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
414 | ltc2945_set_value, LTC2945_MIN_POWER_THRES_H); | |
415 | static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ltc2945_show_value, | |
416 | ltc2945_set_value, LTC2945_MAX_POWER_THRES_H); | |
417 | static SENSOR_DEVICE_ATTR(power1_input_lowest, S_IRUGO, ltc2945_show_value, | |
418 | NULL, LTC2945_MIN_POWER_H); | |
419 | static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ltc2945_show_value, | |
420 | NULL, LTC2945_MAX_POWER_H); | |
421 | static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL, | |
422 | ltc2945_reset_history, LTC2945_MIN_POWER_H); | |
423 | ||
424 | /* Power alarms */ | |
425 | ||
426 | static SENSOR_DEVICE_ATTR(power1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
427 | FAULT_POWER_UV); | |
428 | static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, | |
429 | FAULT_POWER_OV); | |
430 | ||
431 | static struct attribute *ltc2945_attrs[] = { | |
432 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
433 | &sensor_dev_attr_in1_min.dev_attr.attr, | |
434 | &sensor_dev_attr_in1_max.dev_attr.attr, | |
435 | &sensor_dev_attr_in1_lowest.dev_attr.attr, | |
436 | &sensor_dev_attr_in1_highest.dev_attr.attr, | |
437 | &sensor_dev_attr_in1_reset_history.dev_attr.attr, | |
438 | &sensor_dev_attr_in1_min_alarm.dev_attr.attr, | |
439 | &sensor_dev_attr_in1_max_alarm.dev_attr.attr, | |
440 | ||
441 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
442 | &sensor_dev_attr_in2_min.dev_attr.attr, | |
443 | &sensor_dev_attr_in2_max.dev_attr.attr, | |
444 | &sensor_dev_attr_in2_lowest.dev_attr.attr, | |
445 | &sensor_dev_attr_in2_highest.dev_attr.attr, | |
446 | &sensor_dev_attr_in2_reset_history.dev_attr.attr, | |
447 | &sensor_dev_attr_in2_min_alarm.dev_attr.attr, | |
448 | &sensor_dev_attr_in2_max_alarm.dev_attr.attr, | |
449 | ||
450 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
451 | &sensor_dev_attr_curr1_min.dev_attr.attr, | |
452 | &sensor_dev_attr_curr1_max.dev_attr.attr, | |
453 | &sensor_dev_attr_curr1_lowest.dev_attr.attr, | |
454 | &sensor_dev_attr_curr1_highest.dev_attr.attr, | |
455 | &sensor_dev_attr_curr1_reset_history.dev_attr.attr, | |
456 | &sensor_dev_attr_curr1_min_alarm.dev_attr.attr, | |
457 | &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, | |
458 | ||
459 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
460 | &sensor_dev_attr_power1_min.dev_attr.attr, | |
461 | &sensor_dev_attr_power1_max.dev_attr.attr, | |
462 | &sensor_dev_attr_power1_input_lowest.dev_attr.attr, | |
463 | &sensor_dev_attr_power1_input_highest.dev_attr.attr, | |
464 | &sensor_dev_attr_power1_reset_history.dev_attr.attr, | |
465 | &sensor_dev_attr_power1_min_alarm.dev_attr.attr, | |
466 | &sensor_dev_attr_power1_max_alarm.dev_attr.attr, | |
467 | ||
468 | NULL, | |
469 | }; | |
470 | ATTRIBUTE_GROUPS(ltc2945); | |
471 | ||
472 | static struct regmap_config ltc2945_regmap_config = { | |
473 | .reg_bits = 8, | |
474 | .val_bits = 8, | |
475 | .max_register = LTC2945_MIN_ADIN_THRES_L, | |
476 | }; | |
477 | ||
478 | static int ltc2945_probe(struct i2c_client *client, | |
479 | const struct i2c_device_id *id) | |
480 | { | |
481 | struct device *dev = &client->dev; | |
482 | struct device *hwmon_dev; | |
483 | struct regmap *regmap; | |
484 | ||
485 | regmap = devm_regmap_init_i2c(client, <c2945_regmap_config); | |
486 | if (IS_ERR(regmap)) { | |
487 | dev_err(dev, "failed to allocate register map\n"); | |
488 | return PTR_ERR(regmap); | |
489 | } | |
490 | ||
491 | /* Clear faults */ | |
492 | regmap_write(regmap, LTC2945_FAULT, 0x00); | |
493 | ||
494 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, | |
495 | regmap, | |
496 | ltc2945_groups); | |
497 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
498 | } | |
499 | ||
500 | static const struct i2c_device_id ltc2945_id[] = { | |
501 | {"ltc2945", 0}, | |
502 | { } | |
503 | }; | |
504 | ||
505 | MODULE_DEVICE_TABLE(i2c, ltc2945_id); | |
506 | ||
507 | static struct i2c_driver ltc2945_driver = { | |
508 | .driver = { | |
509 | .name = "ltc2945", | |
510 | }, | |
511 | .probe = ltc2945_probe, | |
512 | .id_table = ltc2945_id, | |
513 | }; | |
514 | ||
515 | module_i2c_driver(ltc2945_driver); | |
516 | ||
517 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); | |
518 | MODULE_DESCRIPTION("LTC2945 driver"); | |
519 | MODULE_LICENSE("GPL"); |