Merge tag 'drm-misc-fixes-2023-10-12' of git://anongit.freedesktop.org/drm/drm-misc...
[platform/kernel/linux-rpi.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.h>
35 #include <linux/delay.h>
36 #include <linux/util_macros.h>
37 #include <linux/regmap.h>
38
39 #include <linux/platform_data/ina2xx.h>
40
41 /* common register definitions */
42 #define INA2XX_CONFIG                   0x00
43 #define INA2XX_SHUNT_VOLTAGE            0x01 /* readonly */
44 #define INA2XX_BUS_VOLTAGE              0x02 /* readonly */
45 #define INA2XX_POWER                    0x03 /* readonly */
46 #define INA2XX_CURRENT                  0x04 /* readonly */
47 #define INA2XX_CALIBRATION              0x05
48
49 /* INA226 register definitions */
50 #define INA226_MASK_ENABLE              0x06
51 #define INA226_ALERT_LIMIT              0x07
52 #define INA226_DIE_ID                   0xFF
53
54 /* register count */
55 #define INA219_REGISTERS                6
56 #define INA226_REGISTERS                8
57
58 #define INA2XX_MAX_REGISTERS            8
59
60 /* settings - depend on use case */
61 #define INA219_CONFIG_DEFAULT           0x399F  /* PGA=8 */
62 #define INA226_CONFIG_DEFAULT           0x4527  /* averages=16 */
63
64 /* worst case is 68.10 ms (~14.6Hz, ina219) */
65 #define INA2XX_CONVERSION_RATE          15
66 #define INA2XX_MAX_DELAY                69 /* worst case delay in ms */
67
68 #define INA2XX_RSHUNT_DEFAULT           10000
69
70 /* bit mask for reading the averaging setting in the configuration register */
71 #define INA226_AVG_RD_MASK              0x0E00
72
73 #define INA226_READ_AVG(reg)            (((reg) & INA226_AVG_RD_MASK) >> 9)
74 #define INA226_SHIFT_AVG(val)           ((val) << 9)
75
76 /* bit number of alert functions in Mask/Enable Register */
77 #define INA226_SHUNT_OVER_VOLTAGE_BIT   15
78 #define INA226_SHUNT_UNDER_VOLTAGE_BIT  14
79 #define INA226_BUS_OVER_VOLTAGE_BIT     13
80 #define INA226_BUS_UNDER_VOLTAGE_BIT    12
81 #define INA226_POWER_OVER_LIMIT_BIT     11
82
83 /* bit mask for alert config bits of Mask/Enable Register */
84 #define INA226_ALERT_CONFIG_MASK        0xFC00
85 #define INA226_ALERT_FUNCTION_FLAG      BIT(4)
86
87 /* common attrs, ina226 attrs and NULL */
88 #define INA2XX_MAX_ATTRIBUTE_GROUPS     3
89
90 /*
91  * Both bus voltage and shunt voltage conversion times for ina226 are set
92  * to 0b0100 on POR, which translates to 2200 microseconds in total.
93  */
94 #define INA226_TOTAL_CONV_TIME_DEFAULT  2200
95
96 static struct regmap_config ina2xx_regmap_config = {
97         .reg_bits = 8,
98         .val_bits = 16,
99 };
100
101 enum ina2xx_ids { ina219, ina226 };
102
103 struct ina2xx_config {
104         u16 config_default;
105         int calibration_value;
106         int registers;
107         int shunt_div;
108         int bus_voltage_shift;
109         int bus_voltage_lsb;    /* uV */
110         int power_lsb_factor;
111 };
112
113 struct ina2xx_data {
114         const struct ina2xx_config *config;
115
116         long rshunt;
117         long current_lsb_uA;
118         long power_lsb_uW;
119         struct mutex config_lock;
120         struct regmap *regmap;
121
122         const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
123 };
124
125 static const struct ina2xx_config ina2xx_config[] = {
126         [ina219] = {
127                 .config_default = INA219_CONFIG_DEFAULT,
128                 .calibration_value = 4096,
129                 .registers = INA219_REGISTERS,
130                 .shunt_div = 100,
131                 .bus_voltage_shift = 3,
132                 .bus_voltage_lsb = 4000,
133                 .power_lsb_factor = 20,
134         },
135         [ina226] = {
136                 .config_default = INA226_CONFIG_DEFAULT,
137                 .calibration_value = 2048,
138                 .registers = INA226_REGISTERS,
139                 .shunt_div = 400,
140                 .bus_voltage_shift = 0,
141                 .bus_voltage_lsb = 1250,
142                 .power_lsb_factor = 25,
143         },
144 };
145
146 /*
147  * Available averaging rates for ina226. The indices correspond with
148  * the bit values expected by the chip (according to the ina226 datasheet,
149  * table 3 AVG bit settings, found at
150  * https://www.ti.com/lit/ds/symlink/ina226.pdf.
151  */
152 static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
153
154 static int ina226_reg_to_interval(u16 config)
155 {
156         int avg = ina226_avg_tab[INA226_READ_AVG(config)];
157
158         /*
159          * Multiply the total conversion time by the number of averages.
160          * Return the result in milliseconds.
161          */
162         return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000);
163 }
164
165 /*
166  * Return the new, shifted AVG field value of CONFIG register,
167  * to use with regmap_update_bits
168  */
169 static u16 ina226_interval_to_reg(int interval)
170 {
171         int avg, avg_bits;
172
173         avg = DIV_ROUND_CLOSEST(interval * 1000,
174                                 INA226_TOTAL_CONV_TIME_DEFAULT);
175         avg_bits = find_closest(avg, ina226_avg_tab,
176                                 ARRAY_SIZE(ina226_avg_tab));
177
178         return INA226_SHIFT_AVG(avg_bits);
179 }
180
181 /*
182  * Calibration register is set to the best value, which eliminates
183  * truncation errors on calculating current register in hardware.
184  * According to datasheet (eq. 3) the best values are 2048 for
185  * ina226 and 4096 for ina219. They are hardcoded as calibration_value.
186  */
187 static int ina2xx_calibrate(struct ina2xx_data *data)
188 {
189         return regmap_write(data->regmap, INA2XX_CALIBRATION,
190                             data->config->calibration_value);
191 }
192
193 /*
194  * Initialize the configuration and calibration registers.
195  */
196 static int ina2xx_init(struct ina2xx_data *data)
197 {
198         int ret = regmap_write(data->regmap, INA2XX_CONFIG,
199                                data->config->config_default);
200         if (ret < 0)
201                 return ret;
202
203         return ina2xx_calibrate(data);
204 }
205
206 static int ina2xx_read_reg(struct device *dev, int reg, unsigned int *regval)
207 {
208         struct ina2xx_data *data = dev_get_drvdata(dev);
209         int ret, retry;
210
211         dev_dbg(dev, "Starting register %d read\n", reg);
212
213         for (retry = 5; retry; retry--) {
214
215                 ret = regmap_read(data->regmap, reg, regval);
216                 if (ret < 0)
217                         return ret;
218
219                 dev_dbg(dev, "read %d, val = 0x%04x\n", reg, *regval);
220
221                 /*
222                  * If the current value in the calibration register is 0, the
223                  * power and current registers will also remain at 0. In case
224                  * the chip has been reset let's check the calibration
225                  * register and reinitialize if needed.
226                  * We do that extra read of the calibration register if there
227                  * is some hint of a chip reset.
228                  */
229                 if (*regval == 0) {
230                         unsigned int cal;
231
232                         ret = regmap_read(data->regmap, INA2XX_CALIBRATION,
233                                           &cal);
234                         if (ret < 0)
235                                 return ret;
236
237                         if (cal == 0) {
238                                 dev_warn(dev, "chip not calibrated, reinitializing\n");
239
240                                 ret = ina2xx_init(data);
241                                 if (ret < 0)
242                                         return ret;
243                                 /*
244                                  * Let's make sure the power and current
245                                  * registers have been updated before trying
246                                  * again.
247                                  */
248                                 msleep(INA2XX_MAX_DELAY);
249                                 continue;
250                         }
251                 }
252                 return 0;
253         }
254
255         /*
256          * If we're here then although all write operations succeeded, the
257          * chip still returns 0 in the calibration register. Nothing more we
258          * can do here.
259          */
260         dev_err(dev, "unable to reinitialize the chip\n");
261         return -ENODEV;
262 }
263
264 static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
265                             unsigned int regval)
266 {
267         int val;
268
269         switch (reg) {
270         case INA2XX_SHUNT_VOLTAGE:
271                 /* signed register */
272                 val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);
273                 break;
274         case INA2XX_BUS_VOLTAGE:
275                 val = (regval >> data->config->bus_voltage_shift)
276                   * data->config->bus_voltage_lsb;
277                 val = DIV_ROUND_CLOSEST(val, 1000);
278                 break;
279         case INA2XX_POWER:
280                 val = regval * data->power_lsb_uW;
281                 break;
282         case INA2XX_CURRENT:
283                 /* signed register, result in mA */
284                 val = (s16)regval * data->current_lsb_uA;
285                 val = DIV_ROUND_CLOSEST(val, 1000);
286                 break;
287         case INA2XX_CALIBRATION:
288                 val = regval;
289                 break;
290         default:
291                 /* programmer goofed */
292                 WARN_ON_ONCE(1);
293                 val = 0;
294                 break;
295         }
296
297         return val;
298 }
299
300 static ssize_t ina2xx_value_show(struct device *dev,
301                                  struct device_attribute *da, char *buf)
302 {
303         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
304         struct ina2xx_data *data = dev_get_drvdata(dev);
305         unsigned int regval;
306
307         int err = ina2xx_read_reg(dev, attr->index, &regval);
308
309         if (err < 0)
310                 return err;
311
312         return sysfs_emit(buf, "%d\n", ina2xx_get_value(data, attr->index, regval));
313 }
314
315 static int ina226_reg_to_alert(struct ina2xx_data *data, u8 bit, u16 regval)
316 {
317         int reg;
318
319         switch (bit) {
320         case INA226_SHUNT_OVER_VOLTAGE_BIT:
321         case INA226_SHUNT_UNDER_VOLTAGE_BIT:
322                 reg = INA2XX_SHUNT_VOLTAGE;
323                 break;
324         case INA226_BUS_OVER_VOLTAGE_BIT:
325         case INA226_BUS_UNDER_VOLTAGE_BIT:
326                 reg = INA2XX_BUS_VOLTAGE;
327                 break;
328         case INA226_POWER_OVER_LIMIT_BIT:
329                 reg = INA2XX_POWER;
330                 break;
331         default:
332                 /* programmer goofed */
333                 WARN_ON_ONCE(1);
334                 return 0;
335         }
336
337         return ina2xx_get_value(data, reg, regval);
338 }
339
340 /*
341  * Turns alert limit values into register values.
342  * Opposite of the formula in ina2xx_get_value().
343  */
344 static s16 ina226_alert_to_reg(struct ina2xx_data *data, u8 bit, int val)
345 {
346         switch (bit) {
347         case INA226_SHUNT_OVER_VOLTAGE_BIT:
348         case INA226_SHUNT_UNDER_VOLTAGE_BIT:
349                 val *= data->config->shunt_div;
350                 return clamp_val(val, SHRT_MIN, SHRT_MAX);
351         case INA226_BUS_OVER_VOLTAGE_BIT:
352         case INA226_BUS_UNDER_VOLTAGE_BIT:
353                 val = (val * 1000) << data->config->bus_voltage_shift;
354                 val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);
355                 return clamp_val(val, 0, SHRT_MAX);
356         case INA226_POWER_OVER_LIMIT_BIT:
357                 val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);
358                 return clamp_val(val, 0, USHRT_MAX);
359         default:
360                 /* programmer goofed */
361                 WARN_ON_ONCE(1);
362                 return 0;
363         }
364 }
365
366 static ssize_t ina226_alert_show(struct device *dev,
367                                  struct device_attribute *da, char *buf)
368 {
369         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
370         struct ina2xx_data *data = dev_get_drvdata(dev);
371         int regval;
372         int val = 0;
373         int ret;
374
375         mutex_lock(&data->config_lock);
376         ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
377         if (ret)
378                 goto abort;
379
380         if (regval & BIT(attr->index)) {
381                 ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, &regval);
382                 if (ret)
383                         goto abort;
384                 val = ina226_reg_to_alert(data, attr->index, regval);
385         }
386
387         ret = sysfs_emit(buf, "%d\n", val);
388 abort:
389         mutex_unlock(&data->config_lock);
390         return ret;
391 }
392
393 static ssize_t ina226_alert_store(struct device *dev,
394                                   struct device_attribute *da,
395                                   const char *buf, size_t count)
396 {
397         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
398         struct ina2xx_data *data = dev_get_drvdata(dev);
399         unsigned long val;
400         int ret;
401
402         ret = kstrtoul(buf, 10, &val);
403         if (ret < 0)
404                 return ret;
405
406         /*
407          * Clear all alerts first to avoid accidentally triggering ALERT pin
408          * due to register write sequence. Then, only enable the alert
409          * if the value is non-zero.
410          */
411         mutex_lock(&data->config_lock);
412         ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
413                                  INA226_ALERT_CONFIG_MASK, 0);
414         if (ret < 0)
415                 goto abort;
416
417         ret = regmap_write(data->regmap, INA226_ALERT_LIMIT,
418                            ina226_alert_to_reg(data, attr->index, val));
419         if (ret < 0)
420                 goto abort;
421
422         if (val != 0) {
423                 ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
424                                          INA226_ALERT_CONFIG_MASK,
425                                          BIT(attr->index));
426                 if (ret < 0)
427                         goto abort;
428         }
429
430         ret = count;
431 abort:
432         mutex_unlock(&data->config_lock);
433         return ret;
434 }
435
436 static ssize_t ina226_alarm_show(struct device *dev,
437                                  struct device_attribute *da, char *buf)
438 {
439         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
440         struct ina2xx_data *data = dev_get_drvdata(dev);
441         int regval;
442         int alarm = 0;
443         int ret;
444
445         ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
446         if (ret)
447                 return ret;
448
449         alarm = (regval & BIT(attr->index)) &&
450                 (regval & INA226_ALERT_FUNCTION_FLAG);
451         return sysfs_emit(buf, "%d\n", alarm);
452 }
453
454 /*
455  * In order to keep calibration register value fixed, the product
456  * of current_lsb and shunt_resistor should also be fixed and equal
457  * to shunt_voltage_lsb = 1 / shunt_div multiplied by 10^9 in order
458  * to keep the scale.
459  */
460 static int ina2xx_set_shunt(struct ina2xx_data *data, long val)
461 {
462         unsigned int dividend = DIV_ROUND_CLOSEST(1000000000,
463                                                   data->config->shunt_div);
464         if (val <= 0 || val > dividend)
465                 return -EINVAL;
466
467         mutex_lock(&data->config_lock);
468         data->rshunt = val;
469         data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);
470         data->power_lsb_uW = data->config->power_lsb_factor *
471                              data->current_lsb_uA;
472         mutex_unlock(&data->config_lock);
473
474         return 0;
475 }
476
477 static ssize_t ina2xx_shunt_show(struct device *dev,
478                                  struct device_attribute *da, char *buf)
479 {
480         struct ina2xx_data *data = dev_get_drvdata(dev);
481
482         return sysfs_emit(buf, "%li\n", data->rshunt);
483 }
484
485 static ssize_t ina2xx_shunt_store(struct device *dev,
486                                   struct device_attribute *da,
487                                   const char *buf, size_t count)
488 {
489         unsigned long val;
490         int status;
491         struct ina2xx_data *data = dev_get_drvdata(dev);
492
493         status = kstrtoul(buf, 10, &val);
494         if (status < 0)
495                 return status;
496
497         status = ina2xx_set_shunt(data, val);
498         if (status < 0)
499                 return status;
500         return count;
501 }
502
503 static ssize_t ina226_interval_store(struct device *dev,
504                                      struct device_attribute *da,
505                                      const char *buf, size_t count)
506 {
507         struct ina2xx_data *data = dev_get_drvdata(dev);
508         unsigned long val;
509         int status;
510
511         status = kstrtoul(buf, 10, &val);
512         if (status < 0)
513                 return status;
514
515         if (val > INT_MAX || val == 0)
516                 return -EINVAL;
517
518         status = regmap_update_bits(data->regmap, INA2XX_CONFIG,
519                                     INA226_AVG_RD_MASK,
520                                     ina226_interval_to_reg(val));
521         if (status < 0)
522                 return status;
523
524         return count;
525 }
526
527 static ssize_t ina226_interval_show(struct device *dev,
528                                     struct device_attribute *da, char *buf)
529 {
530         struct ina2xx_data *data = dev_get_drvdata(dev);
531         int status;
532         unsigned int regval;
533
534         status = regmap_read(data->regmap, INA2XX_CONFIG, &regval);
535         if (status)
536                 return status;
537
538         return sysfs_emit(buf, "%d\n", ina226_reg_to_interval(regval));
539 }
540
541 /* shunt voltage */
542 static SENSOR_DEVICE_ATTR_RO(in0_input, ina2xx_value, INA2XX_SHUNT_VOLTAGE);
543 /* shunt voltage over/under voltage alert setting and alarm */
544 static SENSOR_DEVICE_ATTR_RW(in0_crit, ina226_alert,
545                              INA226_SHUNT_OVER_VOLTAGE_BIT);
546 static SENSOR_DEVICE_ATTR_RW(in0_lcrit, ina226_alert,
547                              INA226_SHUNT_UNDER_VOLTAGE_BIT);
548 static SENSOR_DEVICE_ATTR_RO(in0_crit_alarm, ina226_alarm,
549                              INA226_SHUNT_OVER_VOLTAGE_BIT);
550 static SENSOR_DEVICE_ATTR_RO(in0_lcrit_alarm, ina226_alarm,
551                              INA226_SHUNT_UNDER_VOLTAGE_BIT);
552
553 /* bus voltage */
554 static SENSOR_DEVICE_ATTR_RO(in1_input, ina2xx_value, INA2XX_BUS_VOLTAGE);
555 /* bus voltage over/under voltage alert setting and alarm */
556 static SENSOR_DEVICE_ATTR_RW(in1_crit, ina226_alert,
557                              INA226_BUS_OVER_VOLTAGE_BIT);
558 static SENSOR_DEVICE_ATTR_RW(in1_lcrit, ina226_alert,
559                              INA226_BUS_UNDER_VOLTAGE_BIT);
560 static SENSOR_DEVICE_ATTR_RO(in1_crit_alarm, ina226_alarm,
561                              INA226_BUS_OVER_VOLTAGE_BIT);
562 static SENSOR_DEVICE_ATTR_RO(in1_lcrit_alarm, ina226_alarm,
563                              INA226_BUS_UNDER_VOLTAGE_BIT);
564
565 /* calculated current */
566 static SENSOR_DEVICE_ATTR_RO(curr1_input, ina2xx_value, INA2XX_CURRENT);
567
568 /* calculated power */
569 static SENSOR_DEVICE_ATTR_RO(power1_input, ina2xx_value, INA2XX_POWER);
570 /* over-limit power alert setting and alarm */
571 static SENSOR_DEVICE_ATTR_RW(power1_crit, ina226_alert,
572                              INA226_POWER_OVER_LIMIT_BIT);
573 static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina226_alarm,
574                              INA226_POWER_OVER_LIMIT_BIT);
575
576 /* shunt resistance */
577 static SENSOR_DEVICE_ATTR_RW(shunt_resistor, ina2xx_shunt, INA2XX_CALIBRATION);
578
579 /* update interval (ina226 only) */
580 static SENSOR_DEVICE_ATTR_RW(update_interval, ina226_interval, 0);
581
582 /* pointers to created device attributes */
583 static struct attribute *ina2xx_attrs[] = {
584         &sensor_dev_attr_in0_input.dev_attr.attr,
585         &sensor_dev_attr_in1_input.dev_attr.attr,
586         &sensor_dev_attr_curr1_input.dev_attr.attr,
587         &sensor_dev_attr_power1_input.dev_attr.attr,
588         &sensor_dev_attr_shunt_resistor.dev_attr.attr,
589         NULL,
590 };
591
592 static const struct attribute_group ina2xx_group = {
593         .attrs = ina2xx_attrs,
594 };
595
596 static struct attribute *ina226_attrs[] = {
597         &sensor_dev_attr_in0_crit.dev_attr.attr,
598         &sensor_dev_attr_in0_lcrit.dev_attr.attr,
599         &sensor_dev_attr_in0_crit_alarm.dev_attr.attr,
600         &sensor_dev_attr_in0_lcrit_alarm.dev_attr.attr,
601         &sensor_dev_attr_in1_crit.dev_attr.attr,
602         &sensor_dev_attr_in1_lcrit.dev_attr.attr,
603         &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
604         &sensor_dev_attr_in1_lcrit_alarm.dev_attr.attr,
605         &sensor_dev_attr_power1_crit.dev_attr.attr,
606         &sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
607         &sensor_dev_attr_update_interval.dev_attr.attr,
608         NULL,
609 };
610
611 static const struct attribute_group ina226_group = {
612         .attrs = ina226_attrs,
613 };
614
615 static const struct i2c_device_id ina2xx_id[];
616
617 static int ina2xx_probe(struct i2c_client *client)
618 {
619         struct device *dev = &client->dev;
620         struct ina2xx_data *data;
621         struct device *hwmon_dev;
622         u32 val;
623         int ret, group = 0;
624         enum ina2xx_ids chip;
625
626         if (client->dev.of_node)
627                 chip = (uintptr_t)of_device_get_match_data(&client->dev);
628         else
629                 chip = i2c_match_id(ina2xx_id, client)->driver_data;
630
631         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
632         if (!data)
633                 return -ENOMEM;
634
635         /* set the device type */
636         data->config = &ina2xx_config[chip];
637         mutex_init(&data->config_lock);
638
639         if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
640                 struct ina2xx_platform_data *pdata = dev_get_platdata(dev);
641
642                 if (pdata)
643                         val = pdata->shunt_uohms;
644                 else
645                         val = INA2XX_RSHUNT_DEFAULT;
646         }
647
648         ina2xx_set_shunt(data, val);
649
650         ina2xx_regmap_config.max_register = data->config->registers;
651
652         data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);
653         if (IS_ERR(data->regmap)) {
654                 dev_err(dev, "failed to allocate register map\n");
655                 return PTR_ERR(data->regmap);
656         }
657
658         ret = devm_regulator_get_enable(dev, "vs");
659         if (ret)
660                 return dev_err_probe(dev, ret, "failed to enable vs regulator\n");
661
662         ret = ina2xx_init(data);
663         if (ret < 0) {
664                 dev_err(dev, "error configuring the device: %d\n", ret);
665                 return -ENODEV;
666         }
667
668         data->groups[group++] = &ina2xx_group;
669         if (chip == ina226)
670                 data->groups[group++] = &ina226_group;
671
672         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
673                                                            data, data->groups);
674         if (IS_ERR(hwmon_dev))
675                 return PTR_ERR(hwmon_dev);
676
677         dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
678                  client->name, data->rshunt);
679
680         return 0;
681 }
682
683 static const struct i2c_device_id ina2xx_id[] = {
684         { "ina219", ina219 },
685         { "ina220", ina219 },
686         { "ina226", ina226 },
687         { "ina230", ina226 },
688         { "ina231", ina226 },
689         { }
690 };
691 MODULE_DEVICE_TABLE(i2c, ina2xx_id);
692
693 static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
694         {
695                 .compatible = "ti,ina219",
696                 .data = (void *)ina219
697         },
698         {
699                 .compatible = "ti,ina220",
700                 .data = (void *)ina219
701         },
702         {
703                 .compatible = "ti,ina226",
704                 .data = (void *)ina226
705         },
706         {
707                 .compatible = "ti,ina230",
708                 .data = (void *)ina226
709         },
710         {
711                 .compatible = "ti,ina231",
712                 .data = (void *)ina226
713         },
714         { },
715 };
716 MODULE_DEVICE_TABLE(of, ina2xx_of_match);
717
718 static struct i2c_driver ina2xx_driver = {
719         .driver = {
720                 .name   = "ina2xx",
721                 .of_match_table = of_match_ptr(ina2xx_of_match),
722         },
723         .probe          = ina2xx_probe,
724         .id_table       = ina2xx_id,
725 };
726
727 module_i2c_driver(ina2xx_driver);
728
729 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
730 MODULE_DESCRIPTION("ina2xx driver");
731 MODULE_LICENSE("GPL");