1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for the Texas Instruments / Burr Brown INA209
4 * Bidirectional Current/Power Monitor
5 *
6 * Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
7 *
8 * Derived from Ira W. Snyder's original driver submission
9 * Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca>
10 * Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu>
11 *
12 * Aligned with ina2xx driver
13 * Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
14 * Thanks to Jan Volkering
15 *
16 * Datasheet:
17 * https://www.ti.com/lit/gpn/ina209
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/err.h>
24 #include <linux/slab.h>
25 #include <linux/bug.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29
30 #include <linux/platform_data/ina2xx.h>
31
32 /* register definitions */
33 #define INA209_CONFIGURATION 0x00
34 #define INA209_STATUS 0x01
35 #define INA209_STATUS_MASK 0x02
36 #define INA209_SHUNT_VOLTAGE 0x03
37 #define INA209_BUS_VOLTAGE 0x04
38 #define INA209_POWER 0x05
39 #define INA209_CURRENT 0x06
40 #define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07
41 #define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08
42 #define INA209_BUS_VOLTAGE_MAX_PEAK 0x09
43 #define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a
44 #define INA209_POWER_PEAK 0x0b
45 #define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c
46 #define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d
47 #define INA209_POWER_WARN 0x0e
48 #define INA209_BUS_VOLTAGE_OVER_WARN 0x0f
49 #define INA209_BUS_VOLTAGE_UNDER_WARN 0x10
50 #define INA209_POWER_OVER_LIMIT 0x11
51 #define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12
52 #define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13
53 #define INA209_CRITICAL_DAC_POS 0x14
54 #define INA209_CRITICAL_DAC_NEG 0x15
55 #define INA209_CALIBRATION 0x16
56
57 #define INA209_REGISTERS 0x17
58
59 #define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */
60 #define INA209_SHUNT_DEFAULT 10000 /* uOhm */
61
62 struct ina209_data {
63 struct i2c_client *client;
64
65 struct mutex update_lock;
66 bool valid;
67 unsigned long last_updated; /* in jiffies */
68
69 u16 regs[INA209_REGISTERS]; /* All chip registers */
70
71 u16 config_orig; /* Original configuration */
72 u16 calibration_orig; /* Original calibration */
73 u16 update_interval;
74 };
75
ina209_update_device(struct device * dev)76 static struct ina209_data *ina209_update_device(struct device *dev)
77 {
78 struct ina209_data *data = dev_get_drvdata(dev);
79 struct i2c_client *client = data->client;
80 struct ina209_data *ret = data;
81 s32 val;
82 int i;
83
84 mutex_lock(&data->update_lock);
85
86 if (!data->valid ||
87 time_after(jiffies, data->last_updated + data->update_interval)) {
88 for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
89 val = i2c_smbus_read_word_swapped(client, i);
90 if (val < 0) {
91 ret = ERR_PTR(val);
92 goto abort;
93 }
94 data->regs[i] = val;
95 }
96 data->last_updated = jiffies;
97 data->valid = true;
98 }
99 abort:
100 mutex_unlock(&data->update_lock);
101 return ret;
102 }
103
104 /*
105 * Read a value from a device register and convert it to the
106 * appropriate sysfs units
107 */
ina209_from_reg(const u8 reg,const u16 val)108 static long ina209_from_reg(const u8 reg, const u16 val)
109 {
110 switch (reg) {
111 case INA209_SHUNT_VOLTAGE:
112 case INA209_SHUNT_VOLTAGE_POS_PEAK:
113 case INA209_SHUNT_VOLTAGE_NEG_PEAK:
114 case INA209_SHUNT_VOLTAGE_POS_WARN:
115 case INA209_SHUNT_VOLTAGE_NEG_WARN:
116 /* LSB=10 uV. Convert to mV. */
117 return DIV_ROUND_CLOSEST((s16)val, 100);
118
119 case INA209_BUS_VOLTAGE:
120 case INA209_BUS_VOLTAGE_MAX_PEAK:
121 case INA209_BUS_VOLTAGE_MIN_PEAK:
122 case INA209_BUS_VOLTAGE_OVER_WARN:
123 case INA209_BUS_VOLTAGE_UNDER_WARN:
124 case INA209_BUS_VOLTAGE_OVER_LIMIT:
125 case INA209_BUS_VOLTAGE_UNDER_LIMIT:
126 /* LSB=4 mV, last 3 bits unused */
127 return (val >> 3) * 4;
128
129 case INA209_CRITICAL_DAC_POS:
130 /* LSB=1 mV, in the upper 8 bits */
131 return val >> 8;
132
133 case INA209_CRITICAL_DAC_NEG:
134 /* LSB=1 mV, in the upper 8 bits */
135 return -1 * (val >> 8);
136
137 case INA209_POWER:
138 case INA209_POWER_PEAK:
139 case INA209_POWER_WARN:
140 case INA209_POWER_OVER_LIMIT:
141 /* LSB=20 mW. Convert to uW */
142 return val * 20 * 1000L;
143
144 case INA209_CURRENT:
145 /* LSB=1 mA (selected). Is in mA */
146 return (s16)val;
147 }
148
149 /* programmer goofed */
150 WARN_ON_ONCE(1);
151 return 0;
152 }
153
154 /*
155 * Take a value and convert it to register format, clamping the value
156 * to the appropriate range.
157 */
ina209_to_reg(u8 reg,u16 old,long val)158 static int ina209_to_reg(u8 reg, u16 old, long val)
159 {
160 switch (reg) {
161 case INA209_SHUNT_VOLTAGE_POS_WARN:
162 case INA209_SHUNT_VOLTAGE_NEG_WARN:
163 /* Limit to +- 320 mV, 10 uV LSB */
164 return clamp_val(val, -320, 320) * 100;
165
166 case INA209_BUS_VOLTAGE_OVER_WARN:
167 case INA209_BUS_VOLTAGE_UNDER_WARN:
168 case INA209_BUS_VOLTAGE_OVER_LIMIT:
169 case INA209_BUS_VOLTAGE_UNDER_LIMIT:
170 /*
171 * Limit to 0-32000 mV, 4 mV LSB
172 *
173 * The last three bits aren't part of the value, but we'll
174 * preserve them in their original state.
175 */
176 return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3)
177 | (old & 0x7);
178
179 case INA209_CRITICAL_DAC_NEG:
180 /*
181 * Limit to -255-0 mV, 1 mV LSB
182 * Convert the value to a positive value for the register
183 *
184 * The value lives in the top 8 bits only, be careful
185 * and keep original value of other bits.
186 */
187 return (clamp_val(-val, 0, 255) << 8) | (old & 0xff);
188
189 case INA209_CRITICAL_DAC_POS:
190 /*
191 * Limit to 0-255 mV, 1 mV LSB
192 *
193 * The value lives in the top 8 bits only, be careful
194 * and keep original value of other bits.
195 */
196 return (clamp_val(val, 0, 255) << 8) | (old & 0xff);
197
198 case INA209_POWER_WARN:
199 case INA209_POWER_OVER_LIMIT:
200 /* 20 mW LSB */
201 return DIV_ROUND_CLOSEST(val, 20 * 1000);
202 }
203
204 /* Other registers are read-only, return access error */
205 return -EACCES;
206 }
207
ina209_interval_from_reg(u16 reg)208 static int ina209_interval_from_reg(u16 reg)
209 {
210 return 68 >> (15 - ((reg >> 3) & 0x0f));
211 }
212
ina209_reg_from_interval(u16 config,long interval)213 static u16 ina209_reg_from_interval(u16 config, long interval)
214 {
215 int i, adc;
216
217 if (interval <= 0) {
218 adc = 8;
219 } else {
220 adc = 15;
221 for (i = 34 + 34 / 2; i; i >>= 1) {
222 if (i < interval)
223 break;
224 adc--;
225 }
226 }
227 return (config & 0xf807) | (adc << 3) | (adc << 7);
228 }
229
ina209_interval_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)230 static ssize_t ina209_interval_store(struct device *dev,
231 struct device_attribute *da,
232 const char *buf, size_t count)
233 {
234 struct ina209_data *data = ina209_update_device(dev);
235 long val;
236 u16 regval;
237 int ret;
238
239 if (IS_ERR(data))
240 return PTR_ERR(data);
241
242 ret = kstrtol(buf, 10, &val);
243 if (ret < 0)
244 return ret;
245
246 mutex_lock(&data->update_lock);
247 regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION],
248 val);
249 i2c_smbus_write_word_swapped(data->client, INA209_CONFIGURATION,
250 regval);
251 data->regs[INA209_CONFIGURATION] = regval;
252 data->update_interval = ina209_interval_from_reg(regval);
253 mutex_unlock(&data->update_lock);
254 return count;
255 }
256
ina209_interval_show(struct device * dev,struct device_attribute * da,char * buf)257 static ssize_t ina209_interval_show(struct device *dev,
258 struct device_attribute *da, char *buf)
259 {
260 struct ina209_data *data = dev_get_drvdata(dev);
261
262 return sysfs_emit(buf, "%d\n", data->update_interval);
263 }
264
265 /*
266 * History is reset by writing 1 into bit 0 of the respective peak register.
267 * Since more than one peak register may be affected by the scope of a
268 * reset_history attribute write, use a bit mask in attr->index to identify
269 * which registers are affected.
270 */
271 static u16 ina209_reset_history_regs[] = {
272 INA209_SHUNT_VOLTAGE_POS_PEAK,
273 INA209_SHUNT_VOLTAGE_NEG_PEAK,
274 INA209_BUS_VOLTAGE_MAX_PEAK,
275 INA209_BUS_VOLTAGE_MIN_PEAK,
276 INA209_POWER_PEAK
277 };
278
ina209_history_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)279 static ssize_t ina209_history_store(struct device *dev,
280 struct device_attribute *da,
281 const char *buf, size_t count)
282 {
283 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
284 struct ina209_data *data = dev_get_drvdata(dev);
285 struct i2c_client *client = data->client;
286 u32 mask = attr->index;
287 long val;
288 int i, ret;
289
290 ret = kstrtol(buf, 10, &val);
291 if (ret < 0)
292 return ret;
293
294 mutex_lock(&data->update_lock);
295 for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) {
296 if (mask & (1 << i))
297 i2c_smbus_write_word_swapped(client,
298 ina209_reset_history_regs[i], 1);
299 }
300 data->valid = false;
301 mutex_unlock(&data->update_lock);
302 return count;
303 }
304
ina209_value_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)305 static ssize_t ina209_value_store(struct device *dev,
306 struct device_attribute *da,
307 const char *buf, size_t count)
308 {
309 struct ina209_data *data = ina209_update_device(dev);
310 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
311 int reg = attr->index;
312 long val;
313 int ret;
314
315 if (IS_ERR(data))
316 return PTR_ERR(data);
317
318 ret = kstrtol(buf, 10, &val);
319 if (ret < 0)
320 return ret;
321
322 mutex_lock(&data->update_lock);
323 ret = ina209_to_reg(reg, data->regs[reg], val);
324 if (ret < 0) {
325 count = ret;
326 goto abort;
327 }
328 i2c_smbus_write_word_swapped(data->client, reg, ret);
329 data->regs[reg] = ret;
330 abort:
331 mutex_unlock(&data->update_lock);
332 return count;
333 }
334
ina209_value_show(struct device * dev,struct device_attribute * da,char * buf)335 static ssize_t ina209_value_show(struct device *dev,
336 struct device_attribute *da, char *buf)
337 {
338 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
339 struct ina209_data *data = ina209_update_device(dev);
340 long val;
341
342 if (IS_ERR(data))
343 return PTR_ERR(data);
344
345 val = ina209_from_reg(attr->index, data->regs[attr->index]);
346 return sysfs_emit(buf, "%ld\n", val);
347 }
348
ina209_alarm_show(struct device * dev,struct device_attribute * da,char * buf)349 static ssize_t ina209_alarm_show(struct device *dev,
350 struct device_attribute *da, char *buf)
351 {
352 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
353 struct ina209_data *data = ina209_update_device(dev);
354 const unsigned int mask = attr->index;
355 u16 status;
356
357 if (IS_ERR(data))
358 return PTR_ERR(data);
359
360 status = data->regs[INA209_STATUS];
361
362 /*
363 * All alarms are in the INA209_STATUS register. To avoid a long
364 * switch statement, the mask is passed in attr->index
365 */
366 return sysfs_emit(buf, "%u\n", !!(status & mask));
367 }
368
369 /* Shunt voltage, history, limits, alarms */
370 static SENSOR_DEVICE_ATTR_RO(in0_input, ina209_value, INA209_SHUNT_VOLTAGE);
371 static SENSOR_DEVICE_ATTR_RO(in0_input_highest, ina209_value,
372 INA209_SHUNT_VOLTAGE_POS_PEAK);
373 static SENSOR_DEVICE_ATTR_RO(in0_input_lowest, ina209_value,
374 INA209_SHUNT_VOLTAGE_NEG_PEAK);
375 static SENSOR_DEVICE_ATTR_WO(in0_reset_history, ina209_history,
376 (1 << 0) | (1 << 1));
377 static SENSOR_DEVICE_ATTR_RW(in0_max, ina209_value,
378 INA209_SHUNT_VOLTAGE_POS_WARN);
379 static SENSOR_DEVICE_ATTR_RW(in0_min, ina209_value,
380 INA209_SHUNT_VOLTAGE_NEG_WARN);
381 static SENSOR_DEVICE_ATTR_RW(in0_crit_max, ina209_value,
382 INA209_CRITICAL_DAC_POS);
383 static SENSOR_DEVICE_ATTR_RW(in0_crit_min, ina209_value,
384 INA209_CRITICAL_DAC_NEG);
385
386 static SENSOR_DEVICE_ATTR_RO(in0_min_alarm, ina209_alarm, 1 << 11);
387 static SENSOR_DEVICE_ATTR_RO(in0_max_alarm, ina209_alarm, 1 << 12);
388 static SENSOR_DEVICE_ATTR_RO(in0_crit_min_alarm, ina209_alarm, 1 << 6);
389 static SENSOR_DEVICE_ATTR_RO(in0_crit_max_alarm, ina209_alarm, 1 << 7);
390
391 /* Bus voltage, history, limits, alarms */
392 static SENSOR_DEVICE_ATTR_RO(in1_input, ina209_value, INA209_BUS_VOLTAGE);
393 static SENSOR_DEVICE_ATTR_RO(in1_input_highest, ina209_value,
394 INA209_BUS_VOLTAGE_MAX_PEAK);
395 static SENSOR_DEVICE_ATTR_RO(in1_input_lowest, ina209_value,
396 INA209_BUS_VOLTAGE_MIN_PEAK);
397 static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ina209_history,
398 (1 << 2) | (1 << 3));
399 static SENSOR_DEVICE_ATTR_RW(in1_max, ina209_value,
400 INA209_BUS_VOLTAGE_OVER_WARN);
401 static SENSOR_DEVICE_ATTR_RW(in1_min, ina209_value,
402 INA209_BUS_VOLTAGE_UNDER_WARN);
403 static SENSOR_DEVICE_ATTR_RW(in1_crit_max, ina209_value,
404 INA209_BUS_VOLTAGE_OVER_LIMIT);
405 static SENSOR_DEVICE_ATTR_RW(in1_crit_min, ina209_value,
406 INA209_BUS_VOLTAGE_UNDER_LIMIT);
407
408 static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ina209_alarm, 1 << 14);
409 static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ina209_alarm, 1 << 15);
410 static SENSOR_DEVICE_ATTR_RO(in1_crit_min_alarm, ina209_alarm, 1 << 9);
411 static SENSOR_DEVICE_ATTR_RO(in1_crit_max_alarm, ina209_alarm, 1 << 10);
412
413 /* Power */
414 static SENSOR_DEVICE_ATTR_RO(power1_input, ina209_value, INA209_POWER);
415 static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ina209_value,
416 INA209_POWER_PEAK);
417 static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ina209_history, 1 << 4);
418 static SENSOR_DEVICE_ATTR_RW(power1_max, ina209_value, INA209_POWER_WARN);
419 static SENSOR_DEVICE_ATTR_RW(power1_crit, ina209_value,
420 INA209_POWER_OVER_LIMIT);
421
422 static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ina209_alarm, 1 << 13);
423 static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina209_alarm, 1 << 8);
424
425 /* Current */
426 static SENSOR_DEVICE_ATTR_RO(curr1_input, ina209_value, INA209_CURRENT);
427
428 static SENSOR_DEVICE_ATTR_RW(update_interval, ina209_interval, 0);
429
430 /*
431 * Finally, construct an array of pointers to members of the above objects,
432 * as required for sysfs_create_group()
433 */
434 static struct attribute *ina209_attrs[] = {
435 &sensor_dev_attr_in0_input.dev_attr.attr,
436 &sensor_dev_attr_in0_input_highest.dev_attr.attr,
437 &sensor_dev_attr_in0_input_lowest.dev_attr.attr,
438 &sensor_dev_attr_in0_reset_history.dev_attr.attr,
439 &sensor_dev_attr_in0_max.dev_attr.attr,
440 &sensor_dev_attr_in0_min.dev_attr.attr,
441 &sensor_dev_attr_in0_crit_max.dev_attr.attr,
442 &sensor_dev_attr_in0_crit_min.dev_attr.attr,
443 &sensor_dev_attr_in0_max_alarm.dev_attr.attr,
444 &sensor_dev_attr_in0_min_alarm.dev_attr.attr,
445 &sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr,
446 &sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr,
447
448 &sensor_dev_attr_in1_input.dev_attr.attr,
449 &sensor_dev_attr_in1_input_highest.dev_attr.attr,
450 &sensor_dev_attr_in1_input_lowest.dev_attr.attr,
451 &sensor_dev_attr_in1_reset_history.dev_attr.attr,
452 &sensor_dev_attr_in1_max.dev_attr.attr,
453 &sensor_dev_attr_in1_min.dev_attr.attr,
454 &sensor_dev_attr_in1_crit_max.dev_attr.attr,
455 &sensor_dev_attr_in1_crit_min.dev_attr.attr,
456 &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
457 &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
458 &sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr,
459 &sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr,
460
461 &sensor_dev_attr_power1_input.dev_attr.attr,
462 &sensor_dev_attr_power1_input_highest.dev_attr.attr,
463 &sensor_dev_attr_power1_reset_history.dev_attr.attr,
464 &sensor_dev_attr_power1_max.dev_attr.attr,
465 &sensor_dev_attr_power1_crit.dev_attr.attr,
466 &sensor_dev_attr_power1_max_alarm.dev_attr.attr,
467 &sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
468
469 &sensor_dev_attr_curr1_input.dev_attr.attr,
470
471 &sensor_dev_attr_update_interval.dev_attr.attr,
472
473 NULL,
474 };
475 ATTRIBUTE_GROUPS(ina209);
476
ina209_restore_conf(struct i2c_client * client,struct ina209_data * data)477 static void ina209_restore_conf(struct i2c_client *client,
478 struct ina209_data *data)
479 {
480 /* Restore initial configuration */
481 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
482 data->config_orig);
483 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
484 data->calibration_orig);
485 }
486
ina209_init_client(struct i2c_client * client,struct ina209_data * data)487 static int ina209_init_client(struct i2c_client *client,
488 struct ina209_data *data)
489 {
490 struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev);
491 u32 shunt;
492 int reg;
493
494 reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION);
495 if (reg < 0)
496 return reg;
497 data->calibration_orig = reg;
498
499 reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION);
500 if (reg < 0)
501 return reg;
502 data->config_orig = reg;
503
504 if (pdata) {
505 if (pdata->shunt_uohms <= 0)
506 return -EINVAL;
507 shunt = pdata->shunt_uohms;
508 } else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor",
509 &shunt)) {
510 if (shunt == 0)
511 return -EINVAL;
512 } else {
513 shunt = data->calibration_orig ?
514 40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT;
515 }
516
517 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
518 INA209_CONFIG_DEFAULT);
519 data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT);
520
521 /*
522 * Calibrate current LSB to 1mA. Shunt is in uOhms.
523 * See equation 13 in datasheet.
524 */
525 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
526 clamp_val(40960000 / shunt, 1, 65535));
527
528 /* Clear status register */
529 i2c_smbus_read_word_swapped(client, INA209_STATUS);
530
531 return 0;
532 }
533
ina209_probe(struct i2c_client * client)534 static int ina209_probe(struct i2c_client *client)
535 {
536 struct i2c_adapter *adapter = client->adapter;
537 struct ina209_data *data;
538 struct device *hwmon_dev;
539 int ret;
540
541 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
542 return -ENODEV;
543
544 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
545 if (!data)
546 return -ENOMEM;
547
548 i2c_set_clientdata(client, data);
549 data->client = client;
550 mutex_init(&data->update_lock);
551
552 ret = ina209_init_client(client, data);
553 if (ret)
554 return ret;
555
556 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
557 client->name,
558 data, ina209_groups);
559 if (IS_ERR(hwmon_dev)) {
560 ret = PTR_ERR(hwmon_dev);
561 goto out_restore_conf;
562 }
563
564 return 0;
565
566 out_restore_conf:
567 ina209_restore_conf(client, data);
568 return ret;
569 }
570
ina209_remove(struct i2c_client * client)571 static void ina209_remove(struct i2c_client *client)
572 {
573 struct ina209_data *data = i2c_get_clientdata(client);
574
575 ina209_restore_conf(client, data);
576 }
577
578 static const struct i2c_device_id ina209_id[] = {
579 { "ina209", 0 },
580 { }
581 };
582 MODULE_DEVICE_TABLE(i2c, ina209_id);
583
584 static const struct of_device_id __maybe_unused ina209_of_match[] = {
585 { .compatible = "ti,ina209" },
586 { },
587 };
588 MODULE_DEVICE_TABLE(of, ina209_of_match);
589
590 /* This is the driver that will be inserted */
591 static struct i2c_driver ina209_driver = {
592 .class = I2C_CLASS_HWMON,
593 .driver = {
594 .name = "ina209",
595 .of_match_table = of_match_ptr(ina209_of_match),
596 },
597 .probe = ina209_probe,
598 .remove = ina209_remove,
599 .id_table = ina209_id,
600 };
601
602 module_i2c_driver(ina209_driver);
603
604 MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>");
605 MODULE_DESCRIPTION("INA209 driver");
606 MODULE_LICENSE("GPL");
607
