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f7c2fe38 FL |
1 | /* |
2 | * Driver for Texas Instruments INA219, INA226 power monitor chips | |
3 | * | |
4 | * INA219: | |
5 | * Zero Drift Bi-Directional Current/Power Monitor with I2C Interface | |
6 | * Datasheet: http://www.ti.com/product/ina219 | |
7 | * | |
dc92cd0c GR |
8 | * INA220: |
9 | * Bi-Directional Current/Power Monitor with I2C Interface | |
10 | * Datasheet: http://www.ti.com/product/ina220 | |
11 | * | |
f7c2fe38 FL |
12 | * INA226: |
13 | * Bi-Directional Current/Power Monitor with I2C Interface | |
14 | * Datasheet: http://www.ti.com/product/ina226 | |
15 | * | |
dc92cd0c GR |
16 | * INA230: |
17 | * Bi-directional Current/Power Monitor with I2C Interface | |
18 | * Datasheet: http://www.ti.com/product/ina230 | |
19 | * | |
f7c2fe38 FL |
20 | * Copyright (C) 2012 Lothar Felten <l-felten@ti.com> |
21 | * Thanks to Jan Volkering | |
22 | * | |
23 | * This program is free software; you can redistribute it and/or modify | |
24 | * it under the terms of the GNU General Public License as published by | |
25 | * the Free Software Foundation; version 2 of the License. | |
26 | */ | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/i2c.h> | |
34 | #include <linux/hwmon.h> | |
35 | #include <linux/hwmon-sysfs.h> | |
dcd8f392 | 36 | #include <linux/jiffies.h> |
31e7ad74 | 37 | #include <linux/of.h> |
509416a8 | 38 | #include <linux/delay.h> |
f7c2fe38 FL |
39 | |
40 | #include <linux/platform_data/ina2xx.h> | |
41 | ||
42 | /* common register definitions */ | |
43 | #define INA2XX_CONFIG 0x00 | |
44 | #define INA2XX_SHUNT_VOLTAGE 0x01 /* readonly */ | |
45 | #define INA2XX_BUS_VOLTAGE 0x02 /* readonly */ | |
46 | #define INA2XX_POWER 0x03 /* readonly */ | |
47 | #define INA2XX_CURRENT 0x04 /* readonly */ | |
48 | #define INA2XX_CALIBRATION 0x05 | |
49 | ||
50 | /* INA226 register definitions */ | |
51 | #define INA226_MASK_ENABLE 0x06 | |
52 | #define INA226_ALERT_LIMIT 0x07 | |
53 | #define INA226_DIE_ID 0xFF | |
54 | ||
f7c2fe38 FL |
55 | /* register count */ |
56 | #define INA219_REGISTERS 6 | |
57 | #define INA226_REGISTERS 8 | |
58 | ||
59 | #define INA2XX_MAX_REGISTERS 8 | |
60 | ||
61 | /* settings - depend on use case */ | |
62 | #define INA219_CONFIG_DEFAULT 0x399F /* PGA=8 */ | |
63 | #define INA226_CONFIG_DEFAULT 0x4527 /* averages=16 */ | |
64 | ||
65 | /* worst case is 68.10 ms (~14.6Hz, ina219) */ | |
66 | #define INA2XX_CONVERSION_RATE 15 | |
509416a8 BG |
67 | #define INA2XX_MAX_DELAY 69 /* worst case delay in ms */ |
68 | ||
69 | #define INA2XX_RSHUNT_DEFAULT 10000 | |
f7c2fe38 | 70 | |
72a87a47 BG |
71 | /* bit mask for reading the averaging setting in the configuration register */ |
72 | #define INA226_AVG_RD_MASK 0x0E00 | |
73 | ||
74 | #define INA226_READ_AVG(reg) (((reg) & INA226_AVG_RD_MASK) >> 9) | |
75 | #define INA226_SHIFT_AVG(val) ((val) << 9) | |
76 | ||
77 | /* common attrs, ina226 attrs and NULL */ | |
78 | #define INA2XX_MAX_ATTRIBUTE_GROUPS 3 | |
79 | ||
80 | /* | |
81 | * Both bus voltage and shunt voltage conversion times for ina226 are set | |
82 | * to 0b0100 on POR, which translates to 2200 microseconds in total. | |
83 | */ | |
84 | #define INA226_TOTAL_CONV_TIME_DEFAULT 2200 | |
85 | ||
f7c2fe38 FL |
86 | enum ina2xx_ids { ina219, ina226 }; |
87 | ||
6106db25 GR |
88 | struct ina2xx_config { |
89 | u16 config_default; | |
90 | int calibration_factor; | |
91 | int registers; | |
92 | int shunt_div; | |
93 | int bus_voltage_shift; | |
94 | int bus_voltage_lsb; /* uV */ | |
95 | int power_lsb; /* uW */ | |
96 | }; | |
97 | ||
f7c2fe38 | 98 | struct ina2xx_data { |
468bf0e3 | 99 | struct i2c_client *client; |
6106db25 | 100 | const struct ina2xx_config *config; |
f7c2fe38 | 101 | |
509416a8 | 102 | long rshunt; |
72a87a47 | 103 | u16 curr_config; |
509416a8 | 104 | |
f7c2fe38 FL |
105 | struct mutex update_lock; |
106 | bool valid; | |
107 | unsigned long last_updated; | |
72a87a47 | 108 | int update_interval; /* in jiffies */ |
f7c2fe38 FL |
109 | |
110 | int kind; | |
72a87a47 | 111 | const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS]; |
f7c2fe38 FL |
112 | u16 regs[INA2XX_MAX_REGISTERS]; |
113 | }; | |
114 | ||
6106db25 GR |
115 | static const struct ina2xx_config ina2xx_config[] = { |
116 | [ina219] = { | |
117 | .config_default = INA219_CONFIG_DEFAULT, | |
118 | .calibration_factor = 40960000, | |
119 | .registers = INA219_REGISTERS, | |
120 | .shunt_div = 100, | |
121 | .bus_voltage_shift = 3, | |
122 | .bus_voltage_lsb = 4000, | |
123 | .power_lsb = 20000, | |
124 | }, | |
125 | [ina226] = { | |
126 | .config_default = INA226_CONFIG_DEFAULT, | |
127 | .calibration_factor = 5120000, | |
128 | .registers = INA226_REGISTERS, | |
129 | .shunt_div = 400, | |
130 | .bus_voltage_shift = 0, | |
131 | .bus_voltage_lsb = 1250, | |
132 | .power_lsb = 25000, | |
133 | }, | |
134 | }; | |
135 | ||
72a87a47 BG |
136 | /* |
137 | * Available averaging rates for ina226. The indices correspond with | |
138 | * the bit values expected by the chip (according to the ina226 datasheet, | |
139 | * table 3 AVG bit settings, found at | |
140 | * http://www.ti.com/lit/ds/symlink/ina226.pdf. | |
141 | */ | |
142 | static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 }; | |
143 | ||
144 | static int ina226_avg_bits(int avg) | |
145 | { | |
146 | int i; | |
147 | ||
148 | /* Get the closest average from the tab. */ | |
149 | for (i = 0; i < ARRAY_SIZE(ina226_avg_tab) - 1; i++) { | |
150 | if (avg <= (ina226_avg_tab[i] + ina226_avg_tab[i + 1]) / 2) | |
151 | break; | |
152 | } | |
153 | ||
154 | return i; /* Return 0b0111 for values greater than 1024. */ | |
155 | } | |
156 | ||
157 | static int ina226_reg_to_interval(u16 config) | |
158 | { | |
159 | int avg = ina226_avg_tab[INA226_READ_AVG(config)]; | |
160 | ||
161 | /* | |
162 | * Multiply the total conversion time by the number of averages. | |
163 | * Return the result in milliseconds. | |
164 | */ | |
165 | return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000); | |
166 | } | |
167 | ||
168 | static u16 ina226_interval_to_reg(int interval, u16 config) | |
169 | { | |
170 | int avg, avg_bits; | |
171 | ||
172 | avg = DIV_ROUND_CLOSEST(interval * 1000, | |
173 | INA226_TOTAL_CONV_TIME_DEFAULT); | |
174 | avg_bits = ina226_avg_bits(avg); | |
175 | ||
176 | return (config & ~INA226_AVG_RD_MASK) | INA226_SHIFT_AVG(avg_bits); | |
177 | } | |
178 | ||
179 | static void ina226_set_update_interval(struct ina2xx_data *data) | |
180 | { | |
181 | int ms; | |
182 | ||
183 | ms = ina226_reg_to_interval(data->curr_config); | |
184 | data->update_interval = msecs_to_jiffies(ms); | |
185 | } | |
186 | ||
8a5fc795 BG |
187 | static int ina2xx_calibrate(struct ina2xx_data *data) |
188 | { | |
189 | return i2c_smbus_write_word_swapped(data->client, INA2XX_CALIBRATION, | |
190 | data->config->calibration_factor / data->rshunt); | |
191 | } | |
192 | ||
509416a8 BG |
193 | /* |
194 | * Initialize the configuration and calibration registers. | |
195 | */ | |
196 | static int ina2xx_init(struct ina2xx_data *data) | |
f7c2fe38 | 197 | { |
468bf0e3 | 198 | struct i2c_client *client = data->client; |
509416a8 | 199 | int ret; |
f7c2fe38 | 200 | |
509416a8 BG |
201 | /* device configuration */ |
202 | ret = i2c_smbus_write_word_swapped(client, INA2XX_CONFIG, | |
72a87a47 | 203 | data->curr_config); |
509416a8 BG |
204 | if (ret < 0) |
205 | return ret; | |
f7c2fe38 | 206 | |
509416a8 BG |
207 | /* |
208 | * Set current LSB to 1mA, shunt is in uOhms | |
209 | * (equation 13 in datasheet). | |
210 | */ | |
8a5fc795 | 211 | return ina2xx_calibrate(data); |
509416a8 | 212 | } |
f7c2fe38 | 213 | |
509416a8 BG |
214 | static int ina2xx_do_update(struct device *dev) |
215 | { | |
216 | struct ina2xx_data *data = dev_get_drvdata(dev); | |
217 | struct i2c_client *client = data->client; | |
218 | int i, rv, retry; | |
f7c2fe38 | 219 | |
509416a8 | 220 | dev_dbg(&client->dev, "Starting ina2xx update\n"); |
f7c2fe38 | 221 | |
509416a8 | 222 | for (retry = 5; retry; retry--) { |
f7c2fe38 | 223 | /* Read all registers */ |
6106db25 | 224 | for (i = 0; i < data->config->registers; i++) { |
509416a8 BG |
225 | rv = i2c_smbus_read_word_swapped(client, i); |
226 | if (rv < 0) | |
227 | return rv; | |
f7c2fe38 FL |
228 | data->regs[i] = rv; |
229 | } | |
509416a8 BG |
230 | |
231 | /* | |
232 | * If the current value in the calibration register is 0, the | |
233 | * power and current registers will also remain at 0. In case | |
234 | * the chip has been reset let's check the calibration | |
235 | * register and reinitialize if needed. | |
236 | */ | |
237 | if (data->regs[INA2XX_CALIBRATION] == 0) { | |
238 | dev_warn(dev, "chip not calibrated, reinitializing\n"); | |
239 | ||
240 | rv = ina2xx_init(data); | |
241 | if (rv < 0) | |
242 | return rv; | |
243 | ||
244 | /* | |
245 | * Let's make sure the power and current registers | |
246 | * have been updated before trying again. | |
247 | */ | |
248 | msleep(INA2XX_MAX_DELAY); | |
249 | continue; | |
250 | } | |
251 | ||
f7c2fe38 FL |
252 | data->last_updated = jiffies; |
253 | data->valid = 1; | |
509416a8 BG |
254 | |
255 | return 0; | |
f7c2fe38 | 256 | } |
509416a8 BG |
257 | |
258 | /* | |
259 | * If we're here then although all write operations succeeded, the | |
260 | * chip still returns 0 in the calibration register. Nothing more we | |
261 | * can do here. | |
262 | */ | |
263 | dev_err(dev, "unable to reinitialize the chip\n"); | |
264 | return -ENODEV; | |
265 | } | |
266 | ||
267 | static struct ina2xx_data *ina2xx_update_device(struct device *dev) | |
268 | { | |
269 | struct ina2xx_data *data = dev_get_drvdata(dev); | |
270 | struct ina2xx_data *ret = data; | |
72a87a47 | 271 | unsigned long after; |
509416a8 BG |
272 | int rv; |
273 | ||
274 | mutex_lock(&data->update_lock); | |
275 | ||
72a87a47 BG |
276 | after = data->last_updated + data->update_interval; |
277 | if (time_after(jiffies, after) || !data->valid) { | |
509416a8 BG |
278 | rv = ina2xx_do_update(dev); |
279 | if (rv < 0) | |
280 | ret = ERR_PTR(rv); | |
281 | } | |
282 | ||
f7c2fe38 FL |
283 | mutex_unlock(&data->update_lock); |
284 | return ret; | |
285 | } | |
286 | ||
6106db25 | 287 | static int ina2xx_get_value(struct ina2xx_data *data, u8 reg) |
f7c2fe38 | 288 | { |
6106db25 | 289 | int val; |
f7c2fe38 FL |
290 | |
291 | switch (reg) { | |
292 | case INA2XX_SHUNT_VOLTAGE: | |
c0214f98 FB |
293 | /* signed register */ |
294 | val = DIV_ROUND_CLOSEST((s16)data->regs[reg], | |
6106db25 | 295 | data->config->shunt_div); |
f7c2fe38 FL |
296 | break; |
297 | case INA2XX_BUS_VOLTAGE: | |
6106db25 GR |
298 | val = (data->regs[reg] >> data->config->bus_voltage_shift) |
299 | * data->config->bus_voltage_lsb; | |
300 | val = DIV_ROUND_CLOSEST(val, 1000); | |
f7c2fe38 FL |
301 | break; |
302 | case INA2XX_POWER: | |
6106db25 | 303 | val = data->regs[reg] * data->config->power_lsb; |
f7c2fe38 FL |
304 | break; |
305 | case INA2XX_CURRENT: | |
c0214f98 FB |
306 | /* signed register, LSB=1mA (selected), in mA */ |
307 | val = (s16)data->regs[reg]; | |
f7c2fe38 | 308 | break; |
8a5fc795 BG |
309 | case INA2XX_CALIBRATION: |
310 | val = data->config->calibration_factor / data->regs[reg]; | |
311 | break; | |
f7c2fe38 FL |
312 | default: |
313 | /* programmer goofed */ | |
314 | WARN_ON_ONCE(1); | |
315 | val = 0; | |
316 | break; | |
317 | } | |
318 | ||
319 | return val; | |
320 | } | |
321 | ||
322 | static ssize_t ina2xx_show_value(struct device *dev, | |
323 | struct device_attribute *da, char *buf) | |
324 | { | |
325 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
326 | struct ina2xx_data *data = ina2xx_update_device(dev); | |
f7c2fe38 FL |
327 | |
328 | if (IS_ERR(data)) | |
329 | return PTR_ERR(data); | |
330 | ||
6106db25 GR |
331 | return snprintf(buf, PAGE_SIZE, "%d\n", |
332 | ina2xx_get_value(data, attr->index)); | |
f7c2fe38 FL |
333 | } |
334 | ||
8a5fc795 BG |
335 | static ssize_t ina2xx_set_shunt(struct device *dev, |
336 | struct device_attribute *da, | |
337 | const char *buf, size_t count) | |
338 | { | |
339 | struct ina2xx_data *data = ina2xx_update_device(dev); | |
340 | unsigned long val; | |
341 | int status; | |
342 | ||
343 | if (IS_ERR(data)) | |
344 | return PTR_ERR(data); | |
345 | ||
346 | status = kstrtoul(buf, 10, &val); | |
347 | if (status < 0) | |
348 | return status; | |
349 | ||
350 | if (val == 0 || | |
351 | /* Values greater than the calibration factor make no sense. */ | |
352 | val > data->config->calibration_factor) | |
353 | return -EINVAL; | |
354 | ||
355 | mutex_lock(&data->update_lock); | |
356 | data->rshunt = val; | |
357 | status = ina2xx_calibrate(data); | |
358 | mutex_unlock(&data->update_lock); | |
359 | if (status < 0) | |
360 | return status; | |
361 | ||
362 | return count; | |
363 | } | |
364 | ||
72a87a47 BG |
365 | static ssize_t ina226_set_interval(struct device *dev, |
366 | struct device_attribute *da, | |
367 | const char *buf, size_t count) | |
368 | { | |
369 | struct ina2xx_data *data = dev_get_drvdata(dev); | |
370 | unsigned long val; | |
371 | int status; | |
372 | ||
72a87a47 BG |
373 | status = kstrtoul(buf, 10, &val); |
374 | if (status < 0) | |
375 | return status; | |
376 | ||
377 | if (val > INT_MAX || val == 0) | |
378 | return -EINVAL; | |
379 | ||
380 | mutex_lock(&data->update_lock); | |
381 | data->curr_config = ina226_interval_to_reg(val, | |
382 | data->regs[INA2XX_CONFIG]); | |
383 | status = i2c_smbus_write_word_swapped(data->client, | |
384 | INA2XX_CONFIG, | |
385 | data->curr_config); | |
386 | ||
387 | ina226_set_update_interval(data); | |
388 | /* Make sure the next access re-reads all registers. */ | |
389 | data->valid = 0; | |
390 | mutex_unlock(&data->update_lock); | |
391 | if (status < 0) | |
392 | return status; | |
393 | ||
394 | return count; | |
395 | } | |
396 | ||
397 | static ssize_t ina226_show_interval(struct device *dev, | |
398 | struct device_attribute *da, char *buf) | |
399 | { | |
400 | struct ina2xx_data *data = ina2xx_update_device(dev); | |
401 | ||
402 | if (IS_ERR(data)) | |
403 | return PTR_ERR(data); | |
404 | ||
405 | /* | |
406 | * We don't use data->update_interval here as we want to display | |
407 | * the actual interval used by the chip and jiffies_to_msecs() | |
408 | * doesn't seem to be accurate enough. | |
409 | */ | |
410 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
411 | ina226_reg_to_interval(data->regs[INA2XX_CONFIG])); | |
412 | } | |
413 | ||
f7c2fe38 | 414 | /* shunt voltage */ |
f0df0fd9 GR |
415 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina2xx_show_value, NULL, |
416 | INA2XX_SHUNT_VOLTAGE); | |
f7c2fe38 FL |
417 | |
418 | /* bus voltage */ | |
f0df0fd9 GR |
419 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina2xx_show_value, NULL, |
420 | INA2XX_BUS_VOLTAGE); | |
f7c2fe38 FL |
421 | |
422 | /* calculated current */ | |
f0df0fd9 GR |
423 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina2xx_show_value, NULL, |
424 | INA2XX_CURRENT); | |
f7c2fe38 FL |
425 | |
426 | /* calculated power */ | |
f0df0fd9 GR |
427 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL, |
428 | INA2XX_POWER); | |
f7c2fe38 | 429 | |
8a5fc795 BG |
430 | /* shunt resistance */ |
431 | static SENSOR_DEVICE_ATTR(shunt_resistor, S_IRUGO | S_IWUSR, | |
432 | ina2xx_show_value, ina2xx_set_shunt, | |
433 | INA2XX_CALIBRATION); | |
434 | ||
72a87a47 BG |
435 | /* update interval (ina226 only) */ |
436 | static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, | |
437 | ina226_show_interval, ina226_set_interval, 0); | |
438 | ||
f7c2fe38 | 439 | /* pointers to created device attributes */ |
468bf0e3 | 440 | static struct attribute *ina2xx_attrs[] = { |
f7c2fe38 FL |
441 | &sensor_dev_attr_in0_input.dev_attr.attr, |
442 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
443 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
444 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
8a5fc795 | 445 | &sensor_dev_attr_shunt_resistor.dev_attr.attr, |
f7c2fe38 FL |
446 | NULL, |
447 | }; | |
72a87a47 BG |
448 | |
449 | static const struct attribute_group ina2xx_group = { | |
450 | .attrs = ina2xx_attrs, | |
451 | }; | |
452 | ||
453 | static struct attribute *ina226_attrs[] = { | |
454 | &sensor_dev_attr_update_interval.dev_attr.attr, | |
455 | NULL, | |
456 | }; | |
457 | ||
458 | static const struct attribute_group ina226_group = { | |
459 | .attrs = ina226_attrs, | |
460 | }; | |
f7c2fe38 FL |
461 | |
462 | static int ina2xx_probe(struct i2c_client *client, | |
463 | const struct i2c_device_id *id) | |
464 | { | |
465 | struct i2c_adapter *adapter = client->adapter; | |
f7c2fe38 | 466 | struct ina2xx_platform_data *pdata; |
468bf0e3 GR |
467 | struct device *dev = &client->dev; |
468 | struct ina2xx_data *data; | |
469 | struct device *hwmon_dev; | |
468bf0e3 | 470 | u32 val; |
72a87a47 | 471 | int ret, group = 0; |
f7c2fe38 FL |
472 | |
473 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) | |
474 | return -ENODEV; | |
475 | ||
468bf0e3 | 476 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
f7c2fe38 FL |
477 | if (!data) |
478 | return -ENOMEM; | |
479 | ||
468bf0e3 GR |
480 | if (dev_get_platdata(dev)) { |
481 | pdata = dev_get_platdata(dev); | |
509416a8 | 482 | data->rshunt = pdata->shunt_uohms; |
468bf0e3 GR |
483 | } else if (!of_property_read_u32(dev->of_node, |
484 | "shunt-resistor", &val)) { | |
509416a8 BG |
485 | data->rshunt = val; |
486 | } else { | |
487 | data->rshunt = INA2XX_RSHUNT_DEFAULT; | |
f7c2fe38 FL |
488 | } |
489 | ||
f7c2fe38 FL |
490 | /* set the device type */ |
491 | data->kind = id->driver_data; | |
6106db25 | 492 | data->config = &ina2xx_config[data->kind]; |
72a87a47 | 493 | data->curr_config = data->config->config_default; |
509416a8 | 494 | data->client = client; |
f7c2fe38 | 495 | |
72a87a47 BG |
496 | /* |
497 | * Ina226 has a variable update_interval. For ina219 we | |
498 | * use a constant value. | |
499 | */ | |
500 | if (data->kind == ina226) | |
501 | ina226_set_update_interval(data); | |
502 | else | |
503 | data->update_interval = HZ / INA2XX_CONVERSION_RATE; | |
504 | ||
e7947040 BG |
505 | if (data->rshunt <= 0 || |
506 | data->rshunt > data->config->calibration_factor) | |
f975b339 | 507 | return -ENODEV; |
f975b339 | 508 | |
509416a8 | 509 | ret = ina2xx_init(data); |
f975b339 | 510 | if (ret < 0) { |
509416a8 | 511 | dev_err(dev, "error configuring the device: %d\n", ret); |
f975b339 BG |
512 | return -ENODEV; |
513 | } | |
f7c2fe38 | 514 | |
f7c2fe38 FL |
515 | mutex_init(&data->update_lock); |
516 | ||
72a87a47 BG |
517 | data->groups[group++] = &ina2xx_group; |
518 | if (data->kind == ina226) | |
519 | data->groups[group++] = &ina226_group; | |
520 | ||
468bf0e3 | 521 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
72a87a47 | 522 | data, data->groups); |
468bf0e3 GR |
523 | if (IS_ERR(hwmon_dev)) |
524 | return PTR_ERR(hwmon_dev); | |
f7c2fe38 | 525 | |
468bf0e3 | 526 | dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n", |
509416a8 | 527 | id->name, data->rshunt); |
6106db25 | 528 | |
f7c2fe38 | 529 | return 0; |
f7c2fe38 FL |
530 | } |
531 | ||
532 | static const struct i2c_device_id ina2xx_id[] = { | |
533 | { "ina219", ina219 }, | |
dc92cd0c | 534 | { "ina220", ina219 }, |
f7c2fe38 | 535 | { "ina226", ina226 }, |
dc92cd0c | 536 | { "ina230", ina226 }, |
f7c2fe38 FL |
537 | { } |
538 | }; | |
539 | MODULE_DEVICE_TABLE(i2c, ina2xx_id); | |
540 | ||
541 | static struct i2c_driver ina2xx_driver = { | |
542 | .driver = { | |
543 | .name = "ina2xx", | |
544 | }, | |
545 | .probe = ina2xx_probe, | |
f7c2fe38 FL |
546 | .id_table = ina2xx_id, |
547 | }; | |
548 | ||
d835ca0f | 549 | module_i2c_driver(ina2xx_driver); |
f7c2fe38 FL |
550 | |
551 | MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>"); | |
552 | MODULE_DESCRIPTION("ina2xx driver"); | |
553 | MODULE_LICENSE("GPL"); |