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ceeadc5c GR |
1 | /* |
2 | * Driver for the Texas Instruments / Burr Brown INA209 | |
3 | * Bidirectional Current/Power Monitor | |
4 | * | |
5 | * Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net> | |
6 | * | |
7 | * Derived from Ira W. Snyder's original driver submission | |
8 | * Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca> | |
9 | * Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu> | |
10 | * | |
11 | * Aligned with ina2xx driver | |
12 | * Copyright (C) 2012 Lothar Felten <l-felten@ti.com> | |
13 | * Thanks to Jan Volkering | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; version 2 of the License. | |
18 | * | |
19 | * Datasheet: | |
20 | * http://www.ti.com/lit/gpn/ina209 | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/err.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/bug.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/hwmon.h> | |
31 | #include <linux/hwmon-sysfs.h> | |
32 | ||
33 | #include <linux/platform_data/ina2xx.h> | |
34 | ||
35 | /* register definitions */ | |
36 | #define INA209_CONFIGURATION 0x00 | |
37 | #define INA209_STATUS 0x01 | |
38 | #define INA209_STATUS_MASK 0x02 | |
39 | #define INA209_SHUNT_VOLTAGE 0x03 | |
40 | #define INA209_BUS_VOLTAGE 0x04 | |
41 | #define INA209_POWER 0x05 | |
42 | #define INA209_CURRENT 0x06 | |
43 | #define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07 | |
44 | #define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08 | |
45 | #define INA209_BUS_VOLTAGE_MAX_PEAK 0x09 | |
46 | #define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a | |
47 | #define INA209_POWER_PEAK 0x0b | |
48 | #define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c | |
49 | #define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d | |
50 | #define INA209_POWER_WARN 0x0e | |
51 | #define INA209_BUS_VOLTAGE_OVER_WARN 0x0f | |
52 | #define INA209_BUS_VOLTAGE_UNDER_WARN 0x10 | |
53 | #define INA209_POWER_OVER_LIMIT 0x11 | |
54 | #define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12 | |
55 | #define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13 | |
56 | #define INA209_CRITICAL_DAC_POS 0x14 | |
57 | #define INA209_CRITICAL_DAC_NEG 0x15 | |
58 | #define INA209_CALIBRATION 0x16 | |
59 | ||
60 | #define INA209_REGISTERS 0x17 | |
61 | ||
62 | #define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */ | |
63 | #define INA209_SHUNT_DEFAULT 10000 /* uOhm */ | |
64 | ||
65 | struct ina209_data { | |
89de7344 | 66 | struct i2c_client *client; |
ceeadc5c GR |
67 | |
68 | struct mutex update_lock; | |
69 | bool valid; | |
70 | unsigned long last_updated; /* in jiffies */ | |
71 | ||
72 | u16 regs[INA209_REGISTERS]; /* All chip registers */ | |
73 | ||
74 | u16 config_orig; /* Original configuration */ | |
75 | u16 calibration_orig; /* Original calibration */ | |
76 | u16 update_interval; | |
77 | }; | |
78 | ||
79 | static struct ina209_data *ina209_update_device(struct device *dev) | |
80 | { | |
89de7344 GR |
81 | struct ina209_data *data = dev_get_drvdata(dev); |
82 | struct i2c_client *client = data->client; | |
ceeadc5c GR |
83 | struct ina209_data *ret = data; |
84 | s32 val; | |
85 | int i; | |
86 | ||
87 | mutex_lock(&data->update_lock); | |
88 | ||
89 | if (!data->valid || | |
90 | time_after(jiffies, data->last_updated + data->update_interval)) { | |
91 | for (i = 0; i < ARRAY_SIZE(data->regs); i++) { | |
92 | val = i2c_smbus_read_word_swapped(client, i); | |
93 | if (val < 0) { | |
94 | ret = ERR_PTR(val); | |
95 | goto abort; | |
96 | } | |
97 | data->regs[i] = val; | |
98 | } | |
99 | data->last_updated = jiffies; | |
100 | data->valid = true; | |
101 | } | |
102 | abort: | |
103 | mutex_unlock(&data->update_lock); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Read a value from a device register and convert it to the | |
109 | * appropriate sysfs units | |
110 | */ | |
111 | static long ina209_from_reg(const u8 reg, const u16 val) | |
112 | { | |
113 | switch (reg) { | |
114 | case INA209_SHUNT_VOLTAGE: | |
115 | case INA209_SHUNT_VOLTAGE_POS_PEAK: | |
116 | case INA209_SHUNT_VOLTAGE_NEG_PEAK: | |
117 | case INA209_SHUNT_VOLTAGE_POS_WARN: | |
118 | case INA209_SHUNT_VOLTAGE_NEG_WARN: | |
119 | /* LSB=10 uV. Convert to mV. */ | |
120 | return DIV_ROUND_CLOSEST(val, 100); | |
121 | ||
122 | case INA209_BUS_VOLTAGE: | |
123 | case INA209_BUS_VOLTAGE_MAX_PEAK: | |
124 | case INA209_BUS_VOLTAGE_MIN_PEAK: | |
125 | case INA209_BUS_VOLTAGE_OVER_WARN: | |
126 | case INA209_BUS_VOLTAGE_UNDER_WARN: | |
127 | case INA209_BUS_VOLTAGE_OVER_LIMIT: | |
128 | case INA209_BUS_VOLTAGE_UNDER_LIMIT: | |
129 | /* LSB=4 mV, last 3 bits unused */ | |
130 | return (val >> 3) * 4; | |
131 | ||
132 | case INA209_CRITICAL_DAC_POS: | |
133 | /* LSB=1 mV, in the upper 8 bits */ | |
134 | return val >> 8; | |
135 | ||
136 | case INA209_CRITICAL_DAC_NEG: | |
137 | /* LSB=1 mV, in the upper 8 bits */ | |
138 | return -1 * (val >> 8); | |
139 | ||
140 | case INA209_POWER: | |
141 | case INA209_POWER_PEAK: | |
142 | case INA209_POWER_WARN: | |
143 | case INA209_POWER_OVER_LIMIT: | |
144 | /* LSB=20 mW. Convert to uW */ | |
145 | return val * 20 * 1000L; | |
146 | ||
147 | case INA209_CURRENT: | |
148 | /* LSB=1 mA (selected). Is in mA */ | |
149 | return val; | |
150 | } | |
151 | ||
152 | /* programmer goofed */ | |
153 | WARN_ON_ONCE(1); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Take a value and convert it to register format, clamping the value | |
159 | * to the appropriate range. | |
160 | */ | |
161 | static int ina209_to_reg(u8 reg, u16 old, long val) | |
162 | { | |
163 | switch (reg) { | |
164 | case INA209_SHUNT_VOLTAGE_POS_WARN: | |
165 | case INA209_SHUNT_VOLTAGE_NEG_WARN: | |
166 | /* Limit to +- 320 mV, 10 uV LSB */ | |
167 | return clamp_val(val, -320, 320) * 100; | |
168 | ||
169 | case INA209_BUS_VOLTAGE_OVER_WARN: | |
170 | case INA209_BUS_VOLTAGE_UNDER_WARN: | |
171 | case INA209_BUS_VOLTAGE_OVER_LIMIT: | |
172 | case INA209_BUS_VOLTAGE_UNDER_LIMIT: | |
173 | /* | |
174 | * Limit to 0-32000 mV, 4 mV LSB | |
175 | * | |
176 | * The last three bits aren't part of the value, but we'll | |
177 | * preserve them in their original state. | |
178 | */ | |
179 | return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3) | |
180 | | (old & 0x7); | |
181 | ||
182 | case INA209_CRITICAL_DAC_NEG: | |
183 | /* | |
184 | * Limit to -255-0 mV, 1 mV LSB | |
185 | * Convert the value to a positive value for the register | |
186 | * | |
187 | * The value lives in the top 8 bits only, be careful | |
188 | * and keep original value of other bits. | |
189 | */ | |
190 | return (clamp_val(-val, 0, 255) << 8) | (old & 0xff); | |
191 | ||
192 | case INA209_CRITICAL_DAC_POS: | |
193 | /* | |
194 | * Limit to 0-255 mV, 1 mV LSB | |
195 | * | |
196 | * The value lives in the top 8 bits only, be careful | |
197 | * and keep original value of other bits. | |
198 | */ | |
199 | return (clamp_val(val, 0, 255) << 8) | (old & 0xff); | |
200 | ||
201 | case INA209_POWER_WARN: | |
202 | case INA209_POWER_OVER_LIMIT: | |
203 | /* 20 mW LSB */ | |
204 | return DIV_ROUND_CLOSEST(val, 20 * 1000); | |
205 | } | |
206 | ||
207 | /* Other registers are read-only, return access error */ | |
208 | return -EACCES; | |
209 | } | |
210 | ||
211 | static int ina209_interval_from_reg(u16 reg) | |
212 | { | |
213 | return 68 >> (15 - ((reg >> 3) & 0x0f)); | |
214 | } | |
215 | ||
216 | static u16 ina209_reg_from_interval(u16 config, long interval) | |
217 | { | |
218 | int i, adc; | |
219 | ||
220 | if (interval <= 0) { | |
221 | adc = 8; | |
222 | } else { | |
223 | adc = 15; | |
224 | for (i = 34 + 34 / 2; i; i >>= 1) { | |
225 | if (i < interval) | |
226 | break; | |
227 | adc--; | |
228 | } | |
229 | } | |
230 | return (config & 0xf807) | (adc << 3) | (adc << 7); | |
231 | } | |
232 | ||
233 | static ssize_t ina209_set_interval(struct device *dev, | |
234 | struct device_attribute *da, | |
235 | const char *buf, size_t count) | |
236 | { | |
ceeadc5c GR |
237 | struct ina209_data *data = ina209_update_device(dev); |
238 | long val; | |
239 | u16 regval; | |
240 | int ret; | |
241 | ||
242 | if (IS_ERR(data)) | |
243 | return PTR_ERR(data); | |
244 | ||
245 | ret = kstrtol(buf, 10, &val); | |
246 | if (ret < 0) | |
247 | return ret; | |
248 | ||
249 | mutex_lock(&data->update_lock); | |
250 | regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION], | |
251 | val); | |
89de7344 GR |
252 | i2c_smbus_write_word_swapped(data->client, INA209_CONFIGURATION, |
253 | regval); | |
ceeadc5c GR |
254 | data->regs[INA209_CONFIGURATION] = regval; |
255 | data->update_interval = ina209_interval_from_reg(regval); | |
256 | mutex_unlock(&data->update_lock); | |
257 | return count; | |
258 | } | |
259 | ||
260 | static ssize_t ina209_show_interval(struct device *dev, | |
261 | struct device_attribute *da, char *buf) | |
262 | { | |
89de7344 | 263 | struct ina209_data *data = dev_get_drvdata(dev); |
ceeadc5c GR |
264 | |
265 | return snprintf(buf, PAGE_SIZE, "%d\n", data->update_interval); | |
266 | } | |
267 | ||
268 | /* | |
269 | * History is reset by writing 1 into bit 0 of the respective peak register. | |
270 | * Since more than one peak register may be affected by the scope of a | |
271 | * reset_history attribute write, use a bit mask in attr->index to identify | |
272 | * which registers are affected. | |
273 | */ | |
274 | static u16 ina209_reset_history_regs[] = { | |
275 | INA209_SHUNT_VOLTAGE_POS_PEAK, | |
276 | INA209_SHUNT_VOLTAGE_NEG_PEAK, | |
277 | INA209_BUS_VOLTAGE_MAX_PEAK, | |
278 | INA209_BUS_VOLTAGE_MIN_PEAK, | |
279 | INA209_POWER_PEAK | |
280 | }; | |
281 | ||
282 | static ssize_t ina209_reset_history(struct device *dev, | |
283 | struct device_attribute *da, | |
284 | const char *buf, | |
285 | size_t count) | |
286 | { | |
ceeadc5c | 287 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
89de7344 GR |
288 | struct ina209_data *data = dev_get_drvdata(dev); |
289 | struct i2c_client *client = data->client; | |
ceeadc5c GR |
290 | u32 mask = attr->index; |
291 | long val; | |
292 | int i, ret; | |
293 | ||
294 | ret = kstrtol(buf, 10, &val); | |
295 | if (ret < 0) | |
296 | return ret; | |
297 | ||
298 | mutex_lock(&data->update_lock); | |
299 | for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) { | |
300 | if (mask & (1 << i)) | |
301 | i2c_smbus_write_word_swapped(client, | |
302 | ina209_reset_history_regs[i], 1); | |
303 | } | |
304 | data->valid = false; | |
305 | mutex_unlock(&data->update_lock); | |
306 | return count; | |
307 | } | |
308 | ||
309 | static ssize_t ina209_set_value(struct device *dev, | |
310 | struct device_attribute *da, | |
311 | const char *buf, | |
312 | size_t count) | |
313 | { | |
ceeadc5c GR |
314 | struct ina209_data *data = ina209_update_device(dev); |
315 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
316 | int reg = attr->index; | |
317 | long val; | |
318 | int ret; | |
319 | ||
320 | if (IS_ERR(data)) | |
321 | return PTR_ERR(data); | |
322 | ||
323 | ret = kstrtol(buf, 10, &val); | |
324 | if (ret < 0) | |
325 | return ret; | |
326 | ||
327 | mutex_lock(&data->update_lock); | |
328 | ret = ina209_to_reg(reg, data->regs[reg], val); | |
329 | if (ret < 0) { | |
330 | count = ret; | |
331 | goto abort; | |
332 | } | |
89de7344 | 333 | i2c_smbus_write_word_swapped(data->client, reg, ret); |
ceeadc5c GR |
334 | data->regs[reg] = ret; |
335 | abort: | |
336 | mutex_unlock(&data->update_lock); | |
337 | return count; | |
338 | } | |
339 | ||
340 | static ssize_t ina209_show_value(struct device *dev, | |
341 | struct device_attribute *da, | |
342 | char *buf) | |
343 | { | |
344 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
345 | struct ina209_data *data = ina209_update_device(dev); | |
346 | long val; | |
347 | ||
348 | if (IS_ERR(data)) | |
349 | return PTR_ERR(data); | |
350 | ||
351 | val = ina209_from_reg(attr->index, data->regs[attr->index]); | |
352 | return snprintf(buf, PAGE_SIZE, "%ld\n", val); | |
353 | } | |
354 | ||
355 | static ssize_t ina209_show_alarm(struct device *dev, | |
356 | struct device_attribute *da, | |
357 | char *buf) | |
358 | { | |
359 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
360 | struct ina209_data *data = ina209_update_device(dev); | |
361 | const unsigned int mask = attr->index; | |
362 | u16 status; | |
363 | ||
364 | if (IS_ERR(data)) | |
365 | return PTR_ERR(data); | |
366 | ||
367 | status = data->regs[INA209_STATUS]; | |
368 | ||
369 | /* | |
370 | * All alarms are in the INA209_STATUS register. To avoid a long | |
371 | * switch statement, the mask is passed in attr->index | |
372 | */ | |
373 | return snprintf(buf, PAGE_SIZE, "%u\n", !!(status & mask)); | |
374 | } | |
375 | ||
376 | /* Shunt voltage, history, limits, alarms */ | |
377 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina209_show_value, NULL, | |
378 | INA209_SHUNT_VOLTAGE); | |
379 | static SENSOR_DEVICE_ATTR(in0_input_highest, S_IRUGO, ina209_show_value, NULL, | |
380 | INA209_SHUNT_VOLTAGE_POS_PEAK); | |
381 | static SENSOR_DEVICE_ATTR(in0_input_lowest, S_IRUGO, ina209_show_value, NULL, | |
382 | INA209_SHUNT_VOLTAGE_NEG_PEAK); | |
383 | static SENSOR_DEVICE_ATTR(in0_reset_history, S_IWUSR, NULL, | |
384 | ina209_reset_history, (1 << 0) | (1 << 1)); | |
385 | static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO | S_IWUSR, ina209_show_value, | |
386 | ina209_set_value, INA209_SHUNT_VOLTAGE_POS_WARN); | |
387 | static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO | S_IWUSR, ina209_show_value, | |
388 | ina209_set_value, INA209_SHUNT_VOLTAGE_NEG_WARN); | |
389 | static SENSOR_DEVICE_ATTR(in0_crit_max, S_IRUGO | S_IWUSR, ina209_show_value, | |
390 | ina209_set_value, INA209_CRITICAL_DAC_POS); | |
391 | static SENSOR_DEVICE_ATTR(in0_crit_min, S_IRUGO | S_IWUSR, ina209_show_value, | |
392 | ina209_set_value, INA209_CRITICAL_DAC_NEG); | |
393 | ||
394 | static SENSOR_DEVICE_ATTR(in0_min_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
395 | 1 << 11); | |
396 | static SENSOR_DEVICE_ATTR(in0_max_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
397 | 1 << 12); | |
398 | static SENSOR_DEVICE_ATTR(in0_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
399 | 1 << 6); | |
400 | static SENSOR_DEVICE_ATTR(in0_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
401 | 1 << 7); | |
402 | ||
403 | /* Bus voltage, history, limits, alarms */ | |
404 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina209_show_value, NULL, | |
405 | INA209_BUS_VOLTAGE); | |
406 | static SENSOR_DEVICE_ATTR(in1_input_highest, S_IRUGO, ina209_show_value, NULL, | |
407 | INA209_BUS_VOLTAGE_MAX_PEAK); | |
408 | static SENSOR_DEVICE_ATTR(in1_input_lowest, S_IRUGO, ina209_show_value, NULL, | |
409 | INA209_BUS_VOLTAGE_MIN_PEAK); | |
410 | static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL, | |
411 | ina209_reset_history, (1 << 2) | (1 << 3)); | |
412 | static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ina209_show_value, | |
413 | ina209_set_value, INA209_BUS_VOLTAGE_OVER_WARN); | |
414 | static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ina209_show_value, | |
415 | ina209_set_value, INA209_BUS_VOLTAGE_UNDER_WARN); | |
416 | static SENSOR_DEVICE_ATTR(in1_crit_max, S_IRUGO | S_IWUSR, ina209_show_value, | |
417 | ina209_set_value, INA209_BUS_VOLTAGE_OVER_LIMIT); | |
418 | static SENSOR_DEVICE_ATTR(in1_crit_min, S_IRUGO | S_IWUSR, ina209_show_value, | |
419 | ina209_set_value, INA209_BUS_VOLTAGE_UNDER_LIMIT); | |
420 | ||
421 | static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
422 | 1 << 14); | |
423 | static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
424 | 1 << 15); | |
425 | static SENSOR_DEVICE_ATTR(in1_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
426 | 1 << 9); | |
427 | static SENSOR_DEVICE_ATTR(in1_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
428 | 1 << 10); | |
429 | ||
430 | /* Power */ | |
431 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina209_show_value, NULL, | |
432 | INA209_POWER); | |
433 | static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ina209_show_value, | |
434 | NULL, INA209_POWER_PEAK); | |
435 | static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL, | |
436 | ina209_reset_history, 1 << 4); | |
437 | static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ina209_show_value, | |
438 | ina209_set_value, INA209_POWER_WARN); | |
439 | static SENSOR_DEVICE_ATTR(power1_crit, S_IRUGO | S_IWUSR, ina209_show_value, | |
440 | ina209_set_value, INA209_POWER_OVER_LIMIT); | |
441 | ||
442 | static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
443 | 1 << 13); | |
444 | static SENSOR_DEVICE_ATTR(power1_crit_alarm, S_IRUGO, ina209_show_alarm, NULL, | |
445 | 1 << 8); | |
446 | ||
447 | /* Current */ | |
448 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina209_show_value, NULL, | |
449 | INA209_CURRENT); | |
450 | ||
451 | static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, | |
452 | ina209_show_interval, ina209_set_interval, 0); | |
453 | ||
454 | /* | |
455 | * Finally, construct an array of pointers to members of the above objects, | |
456 | * as required for sysfs_create_group() | |
457 | */ | |
89de7344 | 458 | static struct attribute *ina209_attrs[] = { |
ceeadc5c GR |
459 | &sensor_dev_attr_in0_input.dev_attr.attr, |
460 | &sensor_dev_attr_in0_input_highest.dev_attr.attr, | |
461 | &sensor_dev_attr_in0_input_lowest.dev_attr.attr, | |
462 | &sensor_dev_attr_in0_reset_history.dev_attr.attr, | |
463 | &sensor_dev_attr_in0_max.dev_attr.attr, | |
464 | &sensor_dev_attr_in0_min.dev_attr.attr, | |
465 | &sensor_dev_attr_in0_crit_max.dev_attr.attr, | |
466 | &sensor_dev_attr_in0_crit_min.dev_attr.attr, | |
467 | &sensor_dev_attr_in0_max_alarm.dev_attr.attr, | |
468 | &sensor_dev_attr_in0_min_alarm.dev_attr.attr, | |
469 | &sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr, | |
470 | &sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr, | |
471 | ||
472 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
473 | &sensor_dev_attr_in1_input_highest.dev_attr.attr, | |
474 | &sensor_dev_attr_in1_input_lowest.dev_attr.attr, | |
475 | &sensor_dev_attr_in1_reset_history.dev_attr.attr, | |
476 | &sensor_dev_attr_in1_max.dev_attr.attr, | |
477 | &sensor_dev_attr_in1_min.dev_attr.attr, | |
478 | &sensor_dev_attr_in1_crit_max.dev_attr.attr, | |
479 | &sensor_dev_attr_in1_crit_min.dev_attr.attr, | |
480 | &sensor_dev_attr_in1_max_alarm.dev_attr.attr, | |
481 | &sensor_dev_attr_in1_min_alarm.dev_attr.attr, | |
482 | &sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr, | |
483 | &sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr, | |
484 | ||
485 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
486 | &sensor_dev_attr_power1_input_highest.dev_attr.attr, | |
487 | &sensor_dev_attr_power1_reset_history.dev_attr.attr, | |
488 | &sensor_dev_attr_power1_max.dev_attr.attr, | |
489 | &sensor_dev_attr_power1_crit.dev_attr.attr, | |
490 | &sensor_dev_attr_power1_max_alarm.dev_attr.attr, | |
491 | &sensor_dev_attr_power1_crit_alarm.dev_attr.attr, | |
492 | ||
493 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
494 | ||
495 | &sensor_dev_attr_update_interval.dev_attr.attr, | |
496 | ||
497 | NULL, | |
498 | }; | |
89de7344 | 499 | ATTRIBUTE_GROUPS(ina209); |
ceeadc5c GR |
500 | |
501 | static void ina209_restore_conf(struct i2c_client *client, | |
502 | struct ina209_data *data) | |
503 | { | |
504 | /* Restore initial configuration */ | |
505 | i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, | |
506 | data->config_orig); | |
507 | i2c_smbus_write_word_swapped(client, INA209_CALIBRATION, | |
508 | data->calibration_orig); | |
509 | } | |
510 | ||
511 | static int ina209_init_client(struct i2c_client *client, | |
512 | struct ina209_data *data) | |
513 | { | |
514 | struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev); | |
515 | u32 shunt; | |
516 | int reg; | |
517 | ||
518 | reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION); | |
519 | if (reg < 0) | |
520 | return reg; | |
521 | data->calibration_orig = reg; | |
522 | ||
523 | reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION); | |
524 | if (reg < 0) | |
525 | return reg; | |
526 | data->config_orig = reg; | |
527 | ||
528 | if (pdata) { | |
529 | if (pdata->shunt_uohms <= 0) | |
530 | return -EINVAL; | |
531 | shunt = pdata->shunt_uohms; | |
532 | } else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor", | |
533 | &shunt)) { | |
534 | if (shunt == 0) | |
535 | return -EINVAL; | |
536 | } else { | |
537 | shunt = data->calibration_orig ? | |
538 | 40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT; | |
539 | } | |
540 | ||
541 | i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, | |
542 | INA209_CONFIG_DEFAULT); | |
543 | data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT); | |
544 | ||
545 | /* | |
546 | * Calibrate current LSB to 1mA. Shunt is in uOhms. | |
547 | * See equation 13 in datasheet. | |
548 | */ | |
549 | i2c_smbus_write_word_swapped(client, INA209_CALIBRATION, | |
550 | clamp_val(40960000 / shunt, 1, 65535)); | |
551 | ||
552 | /* Clear status register */ | |
553 | i2c_smbus_read_word_swapped(client, INA209_STATUS); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int ina209_probe(struct i2c_client *client, | |
559 | const struct i2c_device_id *id) | |
560 | { | |
561 | struct i2c_adapter *adapter = client->adapter; | |
562 | struct ina209_data *data; | |
89de7344 | 563 | struct device *hwmon_dev; |
ceeadc5c GR |
564 | int ret; |
565 | ||
566 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) | |
567 | return -ENODEV; | |
568 | ||
569 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); | |
570 | if (!data) | |
571 | return -ENOMEM; | |
572 | ||
573 | i2c_set_clientdata(client, data); | |
89de7344 | 574 | data->client = client; |
ceeadc5c GR |
575 | mutex_init(&data->update_lock); |
576 | ||
577 | ret = ina209_init_client(client, data); | |
578 | if (ret) | |
579 | return ret; | |
580 | ||
89de7344 GR |
581 | hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev, |
582 | client->name, | |
583 | data, ina209_groups); | |
584 | if (IS_ERR(hwmon_dev)) { | |
585 | ret = PTR_ERR(hwmon_dev); | |
ceeadc5c | 586 | goto out_restore_conf; |
ceeadc5c GR |
587 | } |
588 | ||
589 | return 0; | |
590 | ||
ceeadc5c GR |
591 | out_restore_conf: |
592 | ina209_restore_conf(client, data); | |
593 | return ret; | |
594 | } | |
595 | ||
596 | static int ina209_remove(struct i2c_client *client) | |
597 | { | |
598 | struct ina209_data *data = i2c_get_clientdata(client); | |
599 | ||
ceeadc5c GR |
600 | ina209_restore_conf(client, data); |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
605 | static const struct i2c_device_id ina209_id[] = { | |
606 | { "ina209", 0 }, | |
607 | { } | |
608 | }; | |
609 | MODULE_DEVICE_TABLE(i2c, ina209_id); | |
610 | ||
611 | /* This is the driver that will be inserted */ | |
612 | static struct i2c_driver ina209_driver = { | |
613 | .class = I2C_CLASS_HWMON, | |
614 | .driver = { | |
615 | .name = "ina209", | |
616 | }, | |
617 | .probe = ina209_probe, | |
618 | .remove = ina209_remove, | |
619 | .id_table = ina209_id, | |
620 | }; | |
621 | ||
622 | module_i2c_driver(ina209_driver); | |
623 | ||
624 | MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>"); | |
625 | MODULE_DESCRIPTION("INA209 driver"); | |
626 | MODULE_LICENSE("GPL"); |