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Merge tag 'v3.10.59' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / hwmon / ina209.c
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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
65struct ina209_data {
66 struct device *hwmon_dev;
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
79static struct ina209_data *ina209_update_device(struct device *dev)
80{
81 struct i2c_client *client = to_i2c_client(dev);
82 struct ina209_data *data = i2c_get_clientdata(client);
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 }
102abort:
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 */
111static 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 */
161static 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
211static int ina209_interval_from_reg(u16 reg)
212{
213 return 68 >> (15 - ((reg >> 3) & 0x0f));
214}
215
216static 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
233static ssize_t ina209_set_interval(struct device *dev,
234 struct device_attribute *da,
235 const char *buf, size_t count)
236{
237 struct i2c_client *client = to_i2c_client(dev);
238 struct ina209_data *data = ina209_update_device(dev);
239 long val;
240 u16 regval;
241 int ret;
242
243 if (IS_ERR(data))
244 return PTR_ERR(data);
245
246 ret = kstrtol(buf, 10, &val);
247 if (ret < 0)
248 return ret;
249
250 mutex_lock(&data->update_lock);
251 regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION],
252 val);
253 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, regval);
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
260static ssize_t ina209_show_interval(struct device *dev,
261 struct device_attribute *da, char *buf)
262{
263 struct i2c_client *client = to_i2c_client(dev);
264 struct ina209_data *data = i2c_get_clientdata(client);
265
266 return snprintf(buf, PAGE_SIZE, "%d\n", data->update_interval);
267}
268
269/*
270 * History is reset by writing 1 into bit 0 of the respective peak register.
271 * Since more than one peak register may be affected by the scope of a
272 * reset_history attribute write, use a bit mask in attr->index to identify
273 * which registers are affected.
274 */
275static u16 ina209_reset_history_regs[] = {
276 INA209_SHUNT_VOLTAGE_POS_PEAK,
277 INA209_SHUNT_VOLTAGE_NEG_PEAK,
278 INA209_BUS_VOLTAGE_MAX_PEAK,
279 INA209_BUS_VOLTAGE_MIN_PEAK,
280 INA209_POWER_PEAK
281};
282
283static ssize_t ina209_reset_history(struct device *dev,
284 struct device_attribute *da,
285 const char *buf,
286 size_t count)
287{
288 struct i2c_client *client = to_i2c_client(dev);
289 struct ina209_data *data = i2c_get_clientdata(client);
290 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
291 u32 mask = attr->index;
292 long val;
293 int i, ret;
294
295 ret = kstrtol(buf, 10, &val);
296 if (ret < 0)
297 return ret;
298
299 mutex_lock(&data->update_lock);
300 for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) {
301 if (mask & (1 << i))
302 i2c_smbus_write_word_swapped(client,
303 ina209_reset_history_regs[i], 1);
304 }
305 data->valid = false;
306 mutex_unlock(&data->update_lock);
307 return count;
308}
309
310static ssize_t ina209_set_value(struct device *dev,
311 struct device_attribute *da,
312 const char *buf,
313 size_t count)
314{
315 struct i2c_client *client = to_i2c_client(dev);
316 struct ina209_data *data = ina209_update_device(dev);
317 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
318 int reg = attr->index;
319 long val;
320 int ret;
321
322 if (IS_ERR(data))
323 return PTR_ERR(data);
324
325 ret = kstrtol(buf, 10, &val);
326 if (ret < 0)
327 return ret;
328
329 mutex_lock(&data->update_lock);
330 ret = ina209_to_reg(reg, data->regs[reg], val);
331 if (ret < 0) {
332 count = ret;
333 goto abort;
334 }
335 i2c_smbus_write_word_swapped(client, reg, ret);
336 data->regs[reg] = ret;
337abort:
338 mutex_unlock(&data->update_lock);
339 return count;
340}
341
342static ssize_t ina209_show_value(struct device *dev,
343 struct device_attribute *da,
344 char *buf)
345{
346 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
347 struct ina209_data *data = ina209_update_device(dev);
348 long val;
349
350 if (IS_ERR(data))
351 return PTR_ERR(data);
352
353 val = ina209_from_reg(attr->index, data->regs[attr->index]);
354 return snprintf(buf, PAGE_SIZE, "%ld\n", val);
355}
356
357static ssize_t ina209_show_alarm(struct device *dev,
358 struct device_attribute *da,
359 char *buf)
360{
361 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
362 struct ina209_data *data = ina209_update_device(dev);
363 const unsigned int mask = attr->index;
364 u16 status;
365
366 if (IS_ERR(data))
367 return PTR_ERR(data);
368
369 status = data->regs[INA209_STATUS];
370
371 /*
372 * All alarms are in the INA209_STATUS register. To avoid a long
373 * switch statement, the mask is passed in attr->index
374 */
375 return snprintf(buf, PAGE_SIZE, "%u\n", !!(status & mask));
376}
377
378/* Shunt voltage, history, limits, alarms */
379static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina209_show_value, NULL,
380 INA209_SHUNT_VOLTAGE);
381static SENSOR_DEVICE_ATTR(in0_input_highest, S_IRUGO, ina209_show_value, NULL,
382 INA209_SHUNT_VOLTAGE_POS_PEAK);
383static SENSOR_DEVICE_ATTR(in0_input_lowest, S_IRUGO, ina209_show_value, NULL,
384 INA209_SHUNT_VOLTAGE_NEG_PEAK);
385static SENSOR_DEVICE_ATTR(in0_reset_history, S_IWUSR, NULL,
386 ina209_reset_history, (1 << 0) | (1 << 1));
387static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO | S_IWUSR, ina209_show_value,
388 ina209_set_value, INA209_SHUNT_VOLTAGE_POS_WARN);
389static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO | S_IWUSR, ina209_show_value,
390 ina209_set_value, INA209_SHUNT_VOLTAGE_NEG_WARN);
391static SENSOR_DEVICE_ATTR(in0_crit_max, S_IRUGO | S_IWUSR, ina209_show_value,
392 ina209_set_value, INA209_CRITICAL_DAC_POS);
393static SENSOR_DEVICE_ATTR(in0_crit_min, S_IRUGO | S_IWUSR, ina209_show_value,
394 ina209_set_value, INA209_CRITICAL_DAC_NEG);
395
396static SENSOR_DEVICE_ATTR(in0_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
397 1 << 11);
398static SENSOR_DEVICE_ATTR(in0_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
399 1 << 12);
400static SENSOR_DEVICE_ATTR(in0_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
401 1 << 6);
402static SENSOR_DEVICE_ATTR(in0_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
403 1 << 7);
404
405/* Bus voltage, history, limits, alarms */
406static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina209_show_value, NULL,
407 INA209_BUS_VOLTAGE);
408static SENSOR_DEVICE_ATTR(in1_input_highest, S_IRUGO, ina209_show_value, NULL,
409 INA209_BUS_VOLTAGE_MAX_PEAK);
410static SENSOR_DEVICE_ATTR(in1_input_lowest, S_IRUGO, ina209_show_value, NULL,
411 INA209_BUS_VOLTAGE_MIN_PEAK);
412static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL,
413 ina209_reset_history, (1 << 2) | (1 << 3));
414static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ina209_show_value,
415 ina209_set_value, INA209_BUS_VOLTAGE_OVER_WARN);
416static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ina209_show_value,
417 ina209_set_value, INA209_BUS_VOLTAGE_UNDER_WARN);
418static SENSOR_DEVICE_ATTR(in1_crit_max, S_IRUGO | S_IWUSR, ina209_show_value,
419 ina209_set_value, INA209_BUS_VOLTAGE_OVER_LIMIT);
420static SENSOR_DEVICE_ATTR(in1_crit_min, S_IRUGO | S_IWUSR, ina209_show_value,
421 ina209_set_value, INA209_BUS_VOLTAGE_UNDER_LIMIT);
422
423static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
424 1 << 14);
425static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
426 1 << 15);
427static SENSOR_DEVICE_ATTR(in1_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
428 1 << 9);
429static SENSOR_DEVICE_ATTR(in1_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
430 1 << 10);
431
432/* Power */
433static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina209_show_value, NULL,
434 INA209_POWER);
435static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ina209_show_value,
436 NULL, INA209_POWER_PEAK);
437static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL,
438 ina209_reset_history, 1 << 4);
439static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ina209_show_value,
440 ina209_set_value, INA209_POWER_WARN);
441static SENSOR_DEVICE_ATTR(power1_crit, S_IRUGO | S_IWUSR, ina209_show_value,
442 ina209_set_value, INA209_POWER_OVER_LIMIT);
443
444static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
445 1 << 13);
446static SENSOR_DEVICE_ATTR(power1_crit_alarm, S_IRUGO, ina209_show_alarm, NULL,
447 1 << 8);
448
449/* Current */
450static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina209_show_value, NULL,
451 INA209_CURRENT);
452
453static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR,
454 ina209_show_interval, ina209_set_interval, 0);
455
456/*
457 * Finally, construct an array of pointers to members of the above objects,
458 * as required for sysfs_create_group()
459 */
460static struct attribute *ina209_attributes[] = {
461 &sensor_dev_attr_in0_input.dev_attr.attr,
462 &sensor_dev_attr_in0_input_highest.dev_attr.attr,
463 &sensor_dev_attr_in0_input_lowest.dev_attr.attr,
464 &sensor_dev_attr_in0_reset_history.dev_attr.attr,
465 &sensor_dev_attr_in0_max.dev_attr.attr,
466 &sensor_dev_attr_in0_min.dev_attr.attr,
467 &sensor_dev_attr_in0_crit_max.dev_attr.attr,
468 &sensor_dev_attr_in0_crit_min.dev_attr.attr,
469 &sensor_dev_attr_in0_max_alarm.dev_attr.attr,
470 &sensor_dev_attr_in0_min_alarm.dev_attr.attr,
471 &sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr,
472 &sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr,
473
474 &sensor_dev_attr_in1_input.dev_attr.attr,
475 &sensor_dev_attr_in1_input_highest.dev_attr.attr,
476 &sensor_dev_attr_in1_input_lowest.dev_attr.attr,
477 &sensor_dev_attr_in1_reset_history.dev_attr.attr,
478 &sensor_dev_attr_in1_max.dev_attr.attr,
479 &sensor_dev_attr_in1_min.dev_attr.attr,
480 &sensor_dev_attr_in1_crit_max.dev_attr.attr,
481 &sensor_dev_attr_in1_crit_min.dev_attr.attr,
482 &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
483 &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
484 &sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr,
485 &sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr,
486
487 &sensor_dev_attr_power1_input.dev_attr.attr,
488 &sensor_dev_attr_power1_input_highest.dev_attr.attr,
489 &sensor_dev_attr_power1_reset_history.dev_attr.attr,
490 &sensor_dev_attr_power1_max.dev_attr.attr,
491 &sensor_dev_attr_power1_crit.dev_attr.attr,
492 &sensor_dev_attr_power1_max_alarm.dev_attr.attr,
493 &sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
494
495 &sensor_dev_attr_curr1_input.dev_attr.attr,
496
497 &sensor_dev_attr_update_interval.dev_attr.attr,
498
499 NULL,
500};
501
502static const struct attribute_group ina209_group = {
503 .attrs = ina209_attributes,
504};
505
506static void ina209_restore_conf(struct i2c_client *client,
507 struct ina209_data *data)
508{
509 /* Restore initial configuration */
510 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
511 data->config_orig);
512 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
513 data->calibration_orig);
514}
515
516static int ina209_init_client(struct i2c_client *client,
517 struct ina209_data *data)
518{
519 struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev);
520 u32 shunt;
521 int reg;
522
523 reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION);
524 if (reg < 0)
525 return reg;
526 data->calibration_orig = reg;
527
528 reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION);
529 if (reg < 0)
530 return reg;
531 data->config_orig = reg;
532
533 if (pdata) {
534 if (pdata->shunt_uohms <= 0)
535 return -EINVAL;
536 shunt = pdata->shunt_uohms;
537 } else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor",
538 &shunt)) {
539 if (shunt == 0)
540 return -EINVAL;
541 } else {
542 shunt = data->calibration_orig ?
543 40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT;
544 }
545
546 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
547 INA209_CONFIG_DEFAULT);
548 data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT);
549
550 /*
551 * Calibrate current LSB to 1mA. Shunt is in uOhms.
552 * See equation 13 in datasheet.
553 */
554 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
555 clamp_val(40960000 / shunt, 1, 65535));
556
557 /* Clear status register */
558 i2c_smbus_read_word_swapped(client, INA209_STATUS);
559
560 return 0;
561}
562
563static int ina209_probe(struct i2c_client *client,
564 const struct i2c_device_id *id)
565{
566 struct i2c_adapter *adapter = client->adapter;
567 struct ina209_data *data;
568 int ret;
569
570 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
571 return -ENODEV;
572
573 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
574 if (!data)
575 return -ENOMEM;
576
577 i2c_set_clientdata(client, data);
578 mutex_init(&data->update_lock);
579
580 ret = ina209_init_client(client, data);
581 if (ret)
582 return ret;
583
584 /* Register sysfs hooks */
585 ret = sysfs_create_group(&client->dev.kobj, &ina209_group);
586 if (ret)
587 goto out_restore_conf;
588
589 data->hwmon_dev = hwmon_device_register(&client->dev);
590 if (IS_ERR(data->hwmon_dev)) {
591 ret = PTR_ERR(data->hwmon_dev);
592 goto out_hwmon_device_register;
593 }
594
595 return 0;
596
597out_hwmon_device_register:
598 sysfs_remove_group(&client->dev.kobj, &ina209_group);
599out_restore_conf:
600 ina209_restore_conf(client, data);
601 return ret;
602}
603
604static int ina209_remove(struct i2c_client *client)
605{
606 struct ina209_data *data = i2c_get_clientdata(client);
607
608 hwmon_device_unregister(data->hwmon_dev);
609 sysfs_remove_group(&client->dev.kobj, &ina209_group);
610 ina209_restore_conf(client, data);
611
612 return 0;
613}
614
615static const struct i2c_device_id ina209_id[] = {
616 { "ina209", 0 },
617 { }
618};
619MODULE_DEVICE_TABLE(i2c, ina209_id);
620
621/* This is the driver that will be inserted */
622static struct i2c_driver ina209_driver = {
623 .class = I2C_CLASS_HWMON,
624 .driver = {
625 .name = "ina209",
626 },
627 .probe = ina209_probe,
628 .remove = ina209_remove,
629 .id_table = ina209_id,
630};
631
632module_i2c_driver(ina209_driver);
633
634MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>");
635MODULE_DESCRIPTION("INA209 driver");
636MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)