xref: /linux/drivers/hwmon/ina209.c (revision 621cde16e49b3ecf7d59a8106a20aaebfb4a59a9)
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" },
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 	.driver = {
593 		.name	= "ina209",
594 		.of_match_table = of_match_ptr(ina209_of_match),
595 	},
596 	.probe		= ina209_probe,
597 	.remove		= ina209_remove,
598 	.id_table	= ina209_id,
599 };
600 
601 module_i2c_driver(ina209_driver);
602 
603 MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>");
604 MODULE_DESCRIPTION("INA209 driver");
605 MODULE_LICENSE("GPL");
606