Merge tag 'linux-watchdog-6.5-rc1' of git://www.linux-watchdog.org/linux-watchdog
[platform/kernel/linux-starfive.git] / drivers / hwmon / ina2xx.c
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
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  */
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  */
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  */
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
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
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
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, &regval);
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
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  */
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
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, &regval);
378         if (ret)
379                 goto abort;
380
381         if (regval & BIT(attr->index)) {
382                 ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, &regval);
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
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
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, &regval);
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  */
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
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
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
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
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, &regval);
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
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 = devm_regulator_get_enable(dev, "vs");
660         if (ret)
661                 return dev_err_probe(dev, ret, "failed to enable vs regulator\n");
662
663         ret = ina2xx_init(data);
664         if (ret < 0) {
665                 dev_err(dev, "error configuring the device: %d\n", ret);
666                 return -ENODEV;
667         }
668
669         data->groups[group++] = &ina2xx_group;
670         if (chip == ina226)
671                 data->groups[group++] = &ina226_group;
672
673         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
674                                                            data, data->groups);
675         if (IS_ERR(hwmon_dev))
676                 return PTR_ERR(hwmon_dev);
677
678         dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
679                  client->name, data->rshunt);
680
681         return 0;
682 }
683
684 static const struct i2c_device_id ina2xx_id[] = {
685         { "ina219", ina219 },
686         { "ina220", ina219 },
687         { "ina226", ina226 },
688         { "ina230", ina226 },
689         { "ina231", ina226 },
690         { }
691 };
692 MODULE_DEVICE_TABLE(i2c, ina2xx_id);
693
694 static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
695         {
696                 .compatible = "ti,ina219",
697                 .data = (void *)ina219
698         },
699         {
700                 .compatible = "ti,ina220",
701                 .data = (void *)ina219
702         },
703         {
704                 .compatible = "ti,ina226",
705                 .data = (void *)ina226
706         },
707         {
708                 .compatible = "ti,ina230",
709                 .data = (void *)ina226
710         },
711         {
712                 .compatible = "ti,ina231",
713                 .data = (void *)ina226
714         },
715         { },
716 };
717 MODULE_DEVICE_TABLE(of, ina2xx_of_match);
718
719 static struct i2c_driver ina2xx_driver = {
720         .driver = {
721                 .name   = "ina2xx",
722                 .of_match_table = of_match_ptr(ina2xx_of_match),
723         },
724         .probe          = ina2xx_probe,
725         .id_table       = ina2xx_id,
726 };
727
728 module_i2c_driver(ina2xx_driver);
729
730 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
731 MODULE_DESCRIPTION("ina2xx driver");
732 MODULE_LICENSE("GPL");