1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for Texas Instruments INA219, INA226 power monitor chips
4 *
5 * INA219:
6 * Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
7 * Datasheet: https://www.ti.com/product/ina219
8 *
9 * INA220:
10 * Bi-Directional Current/Power Monitor with I2C Interface
11 * Datasheet: https://www.ti.com/product/ina220
12 *
13 * INA226:
14 * Bi-Directional Current/Power Monitor with I2C Interface
15 * Datasheet: https://www.ti.com/product/ina226
16 *
17 * INA230:
18 * Bi-directional Current/Power Monitor with I2C Interface
19 * Datasheet: https://www.ti.com/product/ina230
20 *
21 * Copyright (C) 2012 Lothar Felten <lothar.felten@gmail.com>
22 * Thanks to Jan Volkering
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/err.h>
29 #include <linux/slab.h>
30 #include <linux/i2c.h>
31 #include <linux/hwmon.h>
32 #include <linux/hwmon-sysfs.h>
33 #include <linux/jiffies.h>
34 #include <linux/of_device.h>
35 #include <linux/of.h>
36 #include <linux/delay.h>
37 #include <linux/util_macros.h>
38 #include <linux/regmap.h>
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
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
67 #define INA2XX_MAX_DELAY 69 /* worst case delay in ms */
68
69 #define INA2XX_RSHUNT_DEFAULT 10000
70
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 /* bit number of alert functions in Mask/Enable Register */
78 #define INA226_SHUNT_OVER_VOLTAGE_BIT 15
79 #define INA226_SHUNT_UNDER_VOLTAGE_BIT 14
80 #define INA226_BUS_OVER_VOLTAGE_BIT 13
81 #define INA226_BUS_UNDER_VOLTAGE_BIT 12
82 #define INA226_POWER_OVER_LIMIT_BIT 11
83
84 /* bit mask for alert config bits of Mask/Enable Register */
85 #define INA226_ALERT_CONFIG_MASK 0xFC00
86 #define INA226_ALERT_FUNCTION_FLAG BIT(4)
87
88 /* common attrs, ina226 attrs and NULL */
89 #define INA2XX_MAX_ATTRIBUTE_GROUPS 3
90
91 /*
92 * Both bus voltage and shunt voltage conversion times for ina226 are set
93 * to 0b0100 on POR, which translates to 2200 microseconds in total.
94 */
95 #define INA226_TOTAL_CONV_TIME_DEFAULT 2200
96
97 static struct regmap_config ina2xx_regmap_config = {
98 .reg_bits = 8,
99 .val_bits = 16,
100 };
101
102 enum ina2xx_ids { ina219, ina226 };
103
104 struct ina2xx_config {
105 u16 config_default;
106 int calibration_value;
107 int registers;
108 int shunt_div;
109 int bus_voltage_shift;
110 int bus_voltage_lsb; /* uV */
111 int power_lsb_factor;
112 };
113
114 struct ina2xx_data {
115 const struct ina2xx_config *config;
116
117 long rshunt;
118 long current_lsb_uA;
119 long power_lsb_uW;
120 struct mutex config_lock;
121 struct regmap *regmap;
122
123 const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
124 };
125
126 static const struct ina2xx_config ina2xx_config[] = {
127 [ina219] = {
128 .config_default = INA219_CONFIG_DEFAULT,
129 .calibration_value = 4096,
130 .registers = INA219_REGISTERS,
131 .shunt_div = 100,
132 .bus_voltage_shift = 3,
133 .bus_voltage_lsb = 4000,
134 .power_lsb_factor = 20,
135 },
136 [ina226] = {
137 .config_default = INA226_CONFIG_DEFAULT,
138 .calibration_value = 2048,
139 .registers = INA226_REGISTERS,
140 .shunt_div = 400,
141 .bus_voltage_shift = 0,
142 .bus_voltage_lsb = 1250,
143 .power_lsb_factor = 25,
144 },
145 };
146
147 /*
148 * Available averaging rates for ina226. The indices correspond with
149 * the bit values expected by the chip (according to the ina226 datasheet,
150 * table 3 AVG bit settings, found at
151 * https://www.ti.com/lit/ds/symlink/ina226.pdf.
152 */
153 static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
154
ina226_reg_to_interval(u16 config)155 static int ina226_reg_to_interval(u16 config)
156 {
157 int avg = ina226_avg_tab[INA226_READ_AVG(config)];
158
159 /*
160 * Multiply the total conversion time by the number of averages.
161 * Return the result in milliseconds.
162 */
163 return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000);
164 }
165
166 /*
167 * Return the new, shifted AVG field value of CONFIG register,
168 * to use with regmap_update_bits
169 */
ina226_interval_to_reg(int interval)170 static u16 ina226_interval_to_reg(int interval)
171 {
172 int avg, avg_bits;
173
174 avg = DIV_ROUND_CLOSEST(interval * 1000,
175 INA226_TOTAL_CONV_TIME_DEFAULT);
176 avg_bits = find_closest(avg, ina226_avg_tab,
177 ARRAY_SIZE(ina226_avg_tab));
178
179 return INA226_SHIFT_AVG(avg_bits);
180 }
181
182 /*
183 * Calibration register is set to the best value, which eliminates
184 * truncation errors on calculating current register in hardware.
185 * According to datasheet (eq. 3) the best values are 2048 for
186 * ina226 and 4096 for ina219. They are hardcoded as calibration_value.
187 */
ina2xx_calibrate(struct ina2xx_data * data)188 static int ina2xx_calibrate(struct ina2xx_data *data)
189 {
190 return regmap_write(data->regmap, INA2XX_CALIBRATION,
191 data->config->calibration_value);
192 }
193
194 /*
195 * Initialize the configuration and calibration registers.
196 */
ina2xx_init(struct ina2xx_data * data)197 static int ina2xx_init(struct ina2xx_data *data)
198 {
199 int ret = regmap_write(data->regmap, INA2XX_CONFIG,
200 data->config->config_default);
201 if (ret < 0)
202 return ret;
203
204 return ina2xx_calibrate(data);
205 }
206
ina2xx_read_reg(struct device * dev,int reg,unsigned int * regval)207 static int ina2xx_read_reg(struct device *dev, int reg, unsigned int *regval)
208 {
209 struct ina2xx_data *data = dev_get_drvdata(dev);
210 int ret, retry;
211
212 dev_dbg(dev, "Starting register %d read\n", reg);
213
214 for (retry = 5; retry; retry--) {
215
216 ret = regmap_read(data->regmap, reg, regval);
217 if (ret < 0)
218 return ret;
219
220 dev_dbg(dev, "read %d, val = 0x%04x\n", reg, *regval);
221
222 /*
223 * If the current value in the calibration register is 0, the
224 * power and current registers will also remain at 0. In case
225 * the chip has been reset let's check the calibration
226 * register and reinitialize if needed.
227 * We do that extra read of the calibration register if there
228 * is some hint of a chip reset.
229 */
230 if (*regval == 0) {
231 unsigned int cal;
232
233 ret = regmap_read(data->regmap, INA2XX_CALIBRATION,
234 &cal);
235 if (ret < 0)
236 return ret;
237
238 if (cal == 0) {
239 dev_warn(dev, "chip not calibrated, reinitializing\n");
240
241 ret = ina2xx_init(data);
242 if (ret < 0)
243 return ret;
244 /*
245 * Let's make sure the power and current
246 * registers have been updated before trying
247 * again.
248 */
249 msleep(INA2XX_MAX_DELAY);
250 continue;
251 }
252 }
253 return 0;
254 }
255
256 /*
257 * If we're here then although all write operations succeeded, the
258 * chip still returns 0 in the calibration register. Nothing more we
259 * can do here.
260 */
261 dev_err(dev, "unable to reinitialize the chip\n");
262 return -ENODEV;
263 }
264
ina2xx_get_value(struct ina2xx_data * data,u8 reg,unsigned int regval)265 static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
266 unsigned int regval)
267 {
268 int val;
269
270 switch (reg) {
271 case INA2XX_SHUNT_VOLTAGE:
272 /* signed register */
273 val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);
274 break;
275 case INA2XX_BUS_VOLTAGE:
276 val = (regval >> data->config->bus_voltage_shift)
277 * data->config->bus_voltage_lsb;
278 val = DIV_ROUND_CLOSEST(val, 1000);
279 break;
280 case INA2XX_POWER:
281 val = regval * data->power_lsb_uW;
282 break;
283 case INA2XX_CURRENT:
284 /* signed register, result in mA */
285 val = (s16)regval * data->current_lsb_uA;
286 val = DIV_ROUND_CLOSEST(val, 1000);
287 break;
288 case INA2XX_CALIBRATION:
289 val = regval;
290 break;
291 default:
292 /* programmer goofed */
293 WARN_ON_ONCE(1);
294 val = 0;
295 break;
296 }
297
298 return val;
299 }
300
ina2xx_value_show(struct device * dev,struct device_attribute * da,char * buf)301 static ssize_t ina2xx_value_show(struct device *dev,
302 struct device_attribute *da, char *buf)
303 {
304 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
305 struct ina2xx_data *data = dev_get_drvdata(dev);
306 unsigned int regval;
307
308 int err = ina2xx_read_reg(dev, attr->index, ®val);
309
310 if (err < 0)
311 return err;
312
313 return sysfs_emit(buf, "%d\n", ina2xx_get_value(data, attr->index, regval));
314 }
315
ina226_reg_to_alert(struct ina2xx_data * data,u8 bit,u16 regval)316 static int ina226_reg_to_alert(struct ina2xx_data *data, u8 bit, u16 regval)
317 {
318 int reg;
319
320 switch (bit) {
321 case INA226_SHUNT_OVER_VOLTAGE_BIT:
322 case INA226_SHUNT_UNDER_VOLTAGE_BIT:
323 reg = INA2XX_SHUNT_VOLTAGE;
324 break;
325 case INA226_BUS_OVER_VOLTAGE_BIT:
326 case INA226_BUS_UNDER_VOLTAGE_BIT:
327 reg = INA2XX_BUS_VOLTAGE;
328 break;
329 case INA226_POWER_OVER_LIMIT_BIT:
330 reg = INA2XX_POWER;
331 break;
332 default:
333 /* programmer goofed */
334 WARN_ON_ONCE(1);
335 return 0;
336 }
337
338 return ina2xx_get_value(data, reg, regval);
339 }
340
341 /*
342 * Turns alert limit values into register values.
343 * Opposite of the formula in ina2xx_get_value().
344 */
ina226_alert_to_reg(struct ina2xx_data * data,u8 bit,int val)345 static s16 ina226_alert_to_reg(struct ina2xx_data *data, u8 bit, int val)
346 {
347 switch (bit) {
348 case INA226_SHUNT_OVER_VOLTAGE_BIT:
349 case INA226_SHUNT_UNDER_VOLTAGE_BIT:
350 val *= data->config->shunt_div;
351 return clamp_val(val, SHRT_MIN, SHRT_MAX);
352 case INA226_BUS_OVER_VOLTAGE_BIT:
353 case INA226_BUS_UNDER_VOLTAGE_BIT:
354 val = (val * 1000) << data->config->bus_voltage_shift;
355 val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);
356 return clamp_val(val, 0, SHRT_MAX);
357 case INA226_POWER_OVER_LIMIT_BIT:
358 val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);
359 return clamp_val(val, 0, USHRT_MAX);
360 default:
361 /* programmer goofed */
362 WARN_ON_ONCE(1);
363 return 0;
364 }
365 }
366
ina226_alert_show(struct device * dev,struct device_attribute * da,char * buf)367 static ssize_t ina226_alert_show(struct device *dev,
368 struct device_attribute *da, char *buf)
369 {
370 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
371 struct ina2xx_data *data = dev_get_drvdata(dev);
372 int regval;
373 int val = 0;
374 int ret;
375
376 mutex_lock(&data->config_lock);
377 ret = regmap_read(data->regmap, INA226_MASK_ENABLE, ®val);
378 if (ret)
379 goto abort;
380
381 if (regval & BIT(attr->index)) {
382 ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, ®val);
383 if (ret)
384 goto abort;
385 val = ina226_reg_to_alert(data, attr->index, regval);
386 }
387
388 ret = sysfs_emit(buf, "%d\n", val);
389 abort:
390 mutex_unlock(&data->config_lock);
391 return ret;
392 }
393
ina226_alert_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)394 static ssize_t ina226_alert_store(struct device *dev,
395 struct device_attribute *da,
396 const char *buf, size_t count)
397 {
398 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
399 struct ina2xx_data *data = dev_get_drvdata(dev);
400 unsigned long val;
401 int ret;
402
403 ret = kstrtoul(buf, 10, &val);
404 if (ret < 0)
405 return ret;
406
407 /*
408 * Clear all alerts first to avoid accidentally triggering ALERT pin
409 * due to register write sequence. Then, only enable the alert
410 * if the value is non-zero.
411 */
412 mutex_lock(&data->config_lock);
413 ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
414 INA226_ALERT_CONFIG_MASK, 0);
415 if (ret < 0)
416 goto abort;
417
418 ret = regmap_write(data->regmap, INA226_ALERT_LIMIT,
419 ina226_alert_to_reg(data, attr->index, val));
420 if (ret < 0)
421 goto abort;
422
423 if (val != 0) {
424 ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
425 INA226_ALERT_CONFIG_MASK,
426 BIT(attr->index));
427 if (ret < 0)
428 goto abort;
429 }
430
431 ret = count;
432 abort:
433 mutex_unlock(&data->config_lock);
434 return ret;
435 }
436
ina226_alarm_show(struct device * dev,struct device_attribute * da,char * buf)437 static ssize_t ina226_alarm_show(struct device *dev,
438 struct device_attribute *da, char *buf)
439 {
440 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
441 struct ina2xx_data *data = dev_get_drvdata(dev);
442 int regval;
443 int alarm = 0;
444 int ret;
445
446 ret = regmap_read(data->regmap, INA226_MASK_ENABLE, ®val);
447 if (ret)
448 return ret;
449
450 alarm = (regval & BIT(attr->index)) &&
451 (regval & INA226_ALERT_FUNCTION_FLAG);
452 return sysfs_emit(buf, "%d\n", alarm);
453 }
454
455 /*
456 * In order to keep calibration register value fixed, the product
457 * of current_lsb and shunt_resistor should also be fixed and equal
458 * to shunt_voltage_lsb = 1 / shunt_div multiplied by 10^9 in order
459 * to keep the scale.
460 */
ina2xx_set_shunt(struct ina2xx_data * data,long val)461 static int ina2xx_set_shunt(struct ina2xx_data *data, long val)
462 {
463 unsigned int dividend = DIV_ROUND_CLOSEST(1000000000,
464 data->config->shunt_div);
465 if (val <= 0 || val > dividend)
466 return -EINVAL;
467
468 mutex_lock(&data->config_lock);
469 data->rshunt = val;
470 data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);
471 data->power_lsb_uW = data->config->power_lsb_factor *
472 data->current_lsb_uA;
473 mutex_unlock(&data->config_lock);
474
475 return 0;
476 }
477
ina2xx_shunt_show(struct device * dev,struct device_attribute * da,char * buf)478 static ssize_t ina2xx_shunt_show(struct device *dev,
479 struct device_attribute *da, char *buf)
480 {
481 struct ina2xx_data *data = dev_get_drvdata(dev);
482
483 return sysfs_emit(buf, "%li\n", data->rshunt);
484 }
485
ina2xx_shunt_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)486 static ssize_t ina2xx_shunt_store(struct device *dev,
487 struct device_attribute *da,
488 const char *buf, size_t count)
489 {
490 unsigned long val;
491 int status;
492 struct ina2xx_data *data = dev_get_drvdata(dev);
493
494 status = kstrtoul(buf, 10, &val);
495 if (status < 0)
496 return status;
497
498 status = ina2xx_set_shunt(data, val);
499 if (status < 0)
500 return status;
501 return count;
502 }
503
ina226_interval_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)504 static ssize_t ina226_interval_store(struct device *dev,
505 struct device_attribute *da,
506 const char *buf, size_t count)
507 {
508 struct ina2xx_data *data = dev_get_drvdata(dev);
509 unsigned long val;
510 int status;
511
512 status = kstrtoul(buf, 10, &val);
513 if (status < 0)
514 return status;
515
516 if (val > INT_MAX || val == 0)
517 return -EINVAL;
518
519 status = regmap_update_bits(data->regmap, INA2XX_CONFIG,
520 INA226_AVG_RD_MASK,
521 ina226_interval_to_reg(val));
522 if (status < 0)
523 return status;
524
525 return count;
526 }
527
ina226_interval_show(struct device * dev,struct device_attribute * da,char * buf)528 static ssize_t ina226_interval_show(struct device *dev,
529 struct device_attribute *da, char *buf)
530 {
531 struct ina2xx_data *data = dev_get_drvdata(dev);
532 int status;
533 unsigned int regval;
534
535 status = regmap_read(data->regmap, INA2XX_CONFIG, ®val);
536 if (status)
537 return status;
538
539 return sysfs_emit(buf, "%d\n", ina226_reg_to_interval(regval));
540 }
541
542 /* shunt voltage */
543 static SENSOR_DEVICE_ATTR_RO(in0_input, ina2xx_value, INA2XX_SHUNT_VOLTAGE);
544 /* shunt voltage over/under voltage alert setting and alarm */
545 static SENSOR_DEVICE_ATTR_RW(in0_crit, ina226_alert,
546 INA226_SHUNT_OVER_VOLTAGE_BIT);
547 static SENSOR_DEVICE_ATTR_RW(in0_lcrit, ina226_alert,
548 INA226_SHUNT_UNDER_VOLTAGE_BIT);
549 static SENSOR_DEVICE_ATTR_RO(in0_crit_alarm, ina226_alarm,
550 INA226_SHUNT_OVER_VOLTAGE_BIT);
551 static SENSOR_DEVICE_ATTR_RO(in0_lcrit_alarm, ina226_alarm,
552 INA226_SHUNT_UNDER_VOLTAGE_BIT);
553
554 /* bus voltage */
555 static SENSOR_DEVICE_ATTR_RO(in1_input, ina2xx_value, INA2XX_BUS_VOLTAGE);
556 /* bus voltage over/under voltage alert setting and alarm */
557 static SENSOR_DEVICE_ATTR_RW(in1_crit, ina226_alert,
558 INA226_BUS_OVER_VOLTAGE_BIT);
559 static SENSOR_DEVICE_ATTR_RW(in1_lcrit, ina226_alert,
560 INA226_BUS_UNDER_VOLTAGE_BIT);
561 static SENSOR_DEVICE_ATTR_RO(in1_crit_alarm, ina226_alarm,
562 INA226_BUS_OVER_VOLTAGE_BIT);
563 static SENSOR_DEVICE_ATTR_RO(in1_lcrit_alarm, ina226_alarm,
564 INA226_BUS_UNDER_VOLTAGE_BIT);
565
566 /* calculated current */
567 static SENSOR_DEVICE_ATTR_RO(curr1_input, ina2xx_value, INA2XX_CURRENT);
568
569 /* calculated power */
570 static SENSOR_DEVICE_ATTR_RO(power1_input, ina2xx_value, INA2XX_POWER);
571 /* over-limit power alert setting and alarm */
572 static SENSOR_DEVICE_ATTR_RW(power1_crit, ina226_alert,
573 INA226_POWER_OVER_LIMIT_BIT);
574 static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina226_alarm,
575 INA226_POWER_OVER_LIMIT_BIT);
576
577 /* shunt resistance */
578 static SENSOR_DEVICE_ATTR_RW(shunt_resistor, ina2xx_shunt, INA2XX_CALIBRATION);
579
580 /* update interval (ina226 only) */
581 static SENSOR_DEVICE_ATTR_RW(update_interval, ina226_interval, 0);
582
583 /* pointers to created device attributes */
584 static struct attribute *ina2xx_attrs[] = {
585 &sensor_dev_attr_in0_input.dev_attr.attr,
586 &sensor_dev_attr_in1_input.dev_attr.attr,
587 &sensor_dev_attr_curr1_input.dev_attr.attr,
588 &sensor_dev_attr_power1_input.dev_attr.attr,
589 &sensor_dev_attr_shunt_resistor.dev_attr.attr,
590 NULL,
591 };
592
593 static const struct attribute_group ina2xx_group = {
594 .attrs = ina2xx_attrs,
595 };
596
597 static struct attribute *ina226_attrs[] = {
598 &sensor_dev_attr_in0_crit.dev_attr.attr,
599 &sensor_dev_attr_in0_lcrit.dev_attr.attr,
600 &sensor_dev_attr_in0_crit_alarm.dev_attr.attr,
601 &sensor_dev_attr_in0_lcrit_alarm.dev_attr.attr,
602 &sensor_dev_attr_in1_crit.dev_attr.attr,
603 &sensor_dev_attr_in1_lcrit.dev_attr.attr,
604 &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
605 &sensor_dev_attr_in1_lcrit_alarm.dev_attr.attr,
606 &sensor_dev_attr_power1_crit.dev_attr.attr,
607 &sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
608 &sensor_dev_attr_update_interval.dev_attr.attr,
609 NULL,
610 };
611
612 static const struct attribute_group ina226_group = {
613 .attrs = ina226_attrs,
614 };
615
616 static const struct i2c_device_id ina2xx_id[];
617
ina2xx_probe(struct i2c_client * client)618 static int ina2xx_probe(struct i2c_client *client)
619 {
620 struct device *dev = &client->dev;
621 struct ina2xx_data *data;
622 struct device *hwmon_dev;
623 u32 val;
624 int ret, group = 0;
625 enum ina2xx_ids chip;
626
627 if (client->dev.of_node)
628 chip = (enum ina2xx_ids)of_device_get_match_data(&client->dev);
629 else
630 chip = i2c_match_id(ina2xx_id, client)->driver_data;
631
632 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
633 if (!data)
634 return -ENOMEM;
635
636 /* set the device type */
637 data->config = &ina2xx_config[chip];
638 mutex_init(&data->config_lock);
639
640 if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
641 struct ina2xx_platform_data *pdata = dev_get_platdata(dev);
642
643 if (pdata)
644 val = pdata->shunt_uohms;
645 else
646 val = INA2XX_RSHUNT_DEFAULT;
647 }
648
649 ina2xx_set_shunt(data, val);
650
651 ina2xx_regmap_config.max_register = data->config->registers;
652
653 data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);
654 if (IS_ERR(data->regmap)) {
655 dev_err(dev, "failed to allocate register map\n");
656 return PTR_ERR(data->regmap);
657 }
658
659 ret = ina2xx_init(data);
660 if (ret < 0) {
661 dev_err(dev, "error configuring the device: %d\n", ret);
662 return -ENODEV;
663 }
664
665 data->groups[group++] = &ina2xx_group;
666 if (chip == ina226)
667 data->groups[group++] = &ina226_group;
668
669 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
670 data, data->groups);
671 if (IS_ERR(hwmon_dev))
672 return PTR_ERR(hwmon_dev);
673
674 dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
675 client->name, data->rshunt);
676
677 return 0;
678 }
679
680 static const struct i2c_device_id ina2xx_id[] = {
681 { "ina219", ina219 },
682 { "ina220", ina219 },
683 { "ina226", ina226 },
684 { "ina230", ina226 },
685 { "ina231", ina226 },
686 { }
687 };
688 MODULE_DEVICE_TABLE(i2c, ina2xx_id);
689
690 static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
691 {
692 .compatible = "ti,ina219",
693 .data = (void *)ina219
694 },
695 {
696 .compatible = "ti,ina220",
697 .data = (void *)ina219
698 },
699 {
700 .compatible = "ti,ina226",
701 .data = (void *)ina226
702 },
703 {
704 .compatible = "ti,ina230",
705 .data = (void *)ina226
706 },
707 {
708 .compatible = "ti,ina231",
709 .data = (void *)ina226
710 },
711 { },
712 };
713 MODULE_DEVICE_TABLE(of, ina2xx_of_match);
714
715 static struct i2c_driver ina2xx_driver = {
716 .driver = {
717 .name = "ina2xx",
718 .of_match_table = of_match_ptr(ina2xx_of_match),
719 },
720 .probe_new = ina2xx_probe,
721 .id_table = ina2xx_id,
722 };
723
724 module_i2c_driver(ina2xx_driver);
725
726 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
727 MODULE_DESCRIPTION("ina2xx driver");
728 MODULE_LICENSE("GPL");
729