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[mirror_ubuntu-jammy-kernel.git] / drivers / hwmon / ina3221.c
CommitLineData
7cb6dcff
AD		 1/*
2 * INA3221 Triple Current/Voltage Monitor
3 *
4 * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
5 * Andrew F. Davis <afd@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 */
16
17#include <linux/hwmon.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/i2c.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/regmap.h>
23
24#define INA3221_DRIVER_NAME "ina3221"
25
26#define INA3221_CONFIG 0x00
27#define INA3221_SHUNT1 0x01
28#define INA3221_BUS1 0x02
29#define INA3221_SHUNT2 0x03
30#define INA3221_BUS2 0x04
31#define INA3221_SHUNT3 0x05
32#define INA3221_BUS3 0x06
33#define INA3221_CRIT1 0x07
34#define INA3221_WARN1 0x08
35#define INA3221_CRIT2 0x09
36#define INA3221_WARN2 0x0a
37#define INA3221_CRIT3 0x0b
38#define INA3221_WARN3 0x0c
39#define INA3221_MASK_ENABLE 0x0f
40
59d608e1
NC		 41#define INA3221_CONFIG_MODE_MASK GENMASK(2, 0)
42#define INA3221_CONFIG_MODE_POWERDOWN 0
791ebc9d
NC		 43#define INA3221_CONFIG_MODE_SHUNT BIT(0)
44#define INA3221_CONFIG_MODE_BUS BIT(1)
45#define INA3221_CONFIG_MODE_CONTINUOUS BIT(2)
a9e9dd9c 46#define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x))
7cb6dcff
AD		 47
48#define INA3221_RSHUNT_DEFAULT 10000
49
50enum ina3221_fields {
51 /* Configuration */
52 F_RST,
53
54 /* Alert Flags */
55 F_WF3, F_WF2, F_WF1,
56 F_CF3, F_CF2, F_CF1,
57
58 /* sentinel */
59 F_MAX_FIELDS
60};
61
62static const struct reg_field ina3221_reg_fields[] = {
63 [F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15),
64
65 [F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3),
66 [F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4),
67 [F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5),
68 [F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7),
69 [F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8),
70 [F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9),
71};
72
73enum ina3221_channels {
74 INA3221_CHANNEL1,
75 INA3221_CHANNEL2,
76 INA3221_CHANNEL3,
77 INA3221_NUM_CHANNELS
78};
79
80static const unsigned int register_channel[] = {
a9e9dd9c
NC		 81 [INA3221_BUS1] = INA3221_CHANNEL1,
82 [INA3221_BUS2] = INA3221_CHANNEL2,
83 [INA3221_BUS3] = INA3221_CHANNEL3,
7cb6dcff
AD		 84 [INA3221_SHUNT1] = INA3221_CHANNEL1,
85 [INA3221_SHUNT2] = INA3221_CHANNEL2,
86 [INA3221_SHUNT3] = INA3221_CHANNEL3,
87 [INA3221_CRIT1] = INA3221_CHANNEL1,
88 [INA3221_CRIT2] = INA3221_CHANNEL2,
89 [INA3221_CRIT3] = INA3221_CHANNEL3,
90 [INA3221_WARN1] = INA3221_CHANNEL1,
91 [INA3221_WARN2] = INA3221_CHANNEL2,
92 [INA3221_WARN3] = INA3221_CHANNEL3,
93};
94
a9e9dd9c
NC		 95/**
96 * struct ina3221_input - channel input source specific information
97 * @label: label of channel input source
98 * @shunt_resistor: shunt resistor value of channel input source
99 * @disconnected: connection status of channel input source
100 */
101struct ina3221_input {
102 const char *label;
103 int shunt_resistor;
104 bool disconnected;
105};
106
7cb6dcff
AD		 107/**
108 * struct ina3221_data - device specific information
109 * @regmap: Register map of the device
110 * @fields: Register fields of the device
a9e9dd9c 111 * @inputs: Array of channel input source specific structures
59d608e1 112 * @reg_config: Register value of INA3221_CONFIG
7cb6dcff
AD		 113 */
114struct ina3221_data {
115 struct regmap *regmap;
116 struct regmap_field *fields[F_MAX_FIELDS];
a9e9dd9c 117 struct ina3221_input inputs[INA3221_NUM_CHANNELS];
59d608e1 118 u32 reg_config;
7cb6dcff
AD		 119};
120
a9e9dd9c
NC		 121static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
122{
123 return ina->reg_config & INA3221_CONFIG_CHx_EN(channel);
124}
125
126static ssize_t ina3221_show_label(struct device *dev,
127 struct device_attribute *attr, char *buf)
128{
129 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
130 struct ina3221_data *ina = dev_get_drvdata(dev);
131 unsigned int channel = sd_attr->index;
132 struct ina3221_input *input = &ina->inputs[channel];
133
134 return snprintf(buf, PAGE_SIZE, "%s\n", input->label);
135}
136
137static ssize_t ina3221_show_enable(struct device *dev,
138 struct device_attribute *attr, char *buf)
139{
140 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
141 struct ina3221_data *ina = dev_get_drvdata(dev);
142 unsigned int channel = sd_attr->index;
143
144 return snprintf(buf, PAGE_SIZE, "%d\n",
145 ina3221_is_enabled(ina, channel));
146}
147
148static ssize_t ina3221_set_enable(struct device *dev,
149 struct device_attribute *attr,
150 const char *buf, size_t count)
151{
152 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
153 struct ina3221_data *ina = dev_get_drvdata(dev);
154 unsigned int channel = sd_attr->index;
155 u16 config, mask = INA3221_CONFIG_CHx_EN(channel);
156 bool enable;
157 int ret;
158
159 ret = kstrtobool(buf, &enable);
160 if (ret)
161 return ret;
162
163 config = enable ? mask : 0;
164
165 /* Enable or disable the channel */
166 ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, mask, config);
167 if (ret)
168 return ret;
169
170 /* Cache the latest config register value */
171 ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
172 if (ret)
173 return ret;
174
175 return count;
176}
177
7cb6dcff
AD		 178static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
179 int *val)
180{
181 unsigned int regval;
182 int ret;
183
184 ret = regmap_read(ina->regmap, reg, &regval);
185 if (ret)
186 return ret;
187
188 *val = sign_extend32(regval >> 3, 12);
189
190 return 0;
191}
192
193static ssize_t ina3221_show_bus_voltage(struct device *dev,
194 struct device_attribute *attr,
195 char *buf)
196{
197 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
198 struct ina3221_data *ina = dev_get_drvdata(dev);
199 unsigned int reg = sd_attr->index;
a9e9dd9c 200 unsigned int channel = register_channel[reg];
7cb6dcff
AD		 201 int val, voltage_mv, ret;
202
a9e9dd9c
NC		 203 /* No data for read-only attribute if channel is disabled */
204 if (!attr->store && !ina3221_is_enabled(ina, channel))
205 return -ENODATA;
206
7cb6dcff
AD		 207 ret = ina3221_read_value(ina, reg, &val);
208 if (ret)
209 return ret;
210
211 voltage_mv = val * 8;
212
213 return snprintf(buf, PAGE_SIZE, "%d\n", voltage_mv);
214}
215
216static ssize_t ina3221_show_shunt_voltage(struct device *dev,
217 struct device_attribute *attr,
218 char *buf)
219{
220 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
221 struct ina3221_data *ina = dev_get_drvdata(dev);
222 unsigned int reg = sd_attr->index;
a9e9dd9c 223 unsigned int channel = register_channel[reg];
7cb6dcff
AD		 224 int val, voltage_uv, ret;
225
a9e9dd9c
NC		 226 /* No data for read-only attribute if channel is disabled */
227 if (!attr->store && !ina3221_is_enabled(ina, channel))
228 return -ENODATA;
229
7cb6dcff
AD		 230 ret = ina3221_read_value(ina, reg, &val);
231 if (ret)
232 return ret;
233 voltage_uv = val * 40;
234
235 return snprintf(buf, PAGE_SIZE, "%d\n", voltage_uv);
236}
237
238static ssize_t ina3221_show_current(struct device *dev,
239 struct device_attribute *attr, char *buf)
240{
241 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
242 struct ina3221_data *ina = dev_get_drvdata(dev);
243 unsigned int reg = sd_attr->index;
244 unsigned int channel = register_channel[reg];
a9e9dd9c
NC		 245 struct ina3221_input *input = &ina->inputs[channel];
246 int resistance_uo = input->shunt_resistor;
7cb6dcff
AD		 247 int val, current_ma, voltage_nv, ret;
248
a9e9dd9c
NC		 249 /* No data for read-only attribute if channel is disabled */
250 if (!attr->store && !ina3221_is_enabled(ina, channel))
251 return -ENODATA;
252
7cb6dcff
AD		 253 ret = ina3221_read_value(ina, reg, &val);
254 if (ret)
255 return ret;
256 voltage_nv = val * 40000;
257
258 current_ma = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo);
259
260 return snprintf(buf, PAGE_SIZE, "%d\n", current_ma);
261}
262
263static ssize_t ina3221_set_current(struct device *dev,
264 struct device_attribute *attr,
265 const char *buf, size_t count)
266{
267 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
268 struct ina3221_data *ina = dev_get_drvdata(dev);
269 unsigned int reg = sd_attr->index;
270 unsigned int channel = register_channel[reg];
a9e9dd9c
NC		 271 struct ina3221_input *input = &ina->inputs[channel];
272 int resistance_uo = input->shunt_resistor;
7cb6dcff
AD		 273 int val, current_ma, voltage_uv, ret;
274
275 ret = kstrtoint(buf, 0, &current_ma);
276 if (ret)
277 return ret;
278
279 /* clamp current */
280 current_ma = clamp_val(current_ma,
281 INT_MIN / resistance_uo,
282 INT_MAX / resistance_uo);
283
284 voltage_uv = DIV_ROUND_CLOSEST(current_ma * resistance_uo, 1000);
285
286 /* clamp voltage */
287 voltage_uv = clamp_val(voltage_uv, -163800, 163800);
288
289 /* 1 / 40uV(scale) << 3(register shift) = 5 */
290 val = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
291
292 ret = regmap_write(ina->regmap, reg, val);
293 if (ret)
294 return ret;
295
296 return count;
297}
298
299static ssize_t ina3221_show_shunt(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
302 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
303 struct ina3221_data *ina = dev_get_drvdata(dev);
304 unsigned int channel = sd_attr->index;
a9e9dd9c 305 struct ina3221_input *input = &ina->inputs[channel];
7cb6dcff 306
a9e9dd9c 307 return snprintf(buf, PAGE_SIZE, "%d\n", input->shunt_resistor);
7cb6dcff
AD		 308}
309
310static ssize_t ina3221_set_shunt(struct device *dev,
311 struct device_attribute *attr,
312 const char *buf, size_t count)
313{
314 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
315 struct ina3221_data *ina = dev_get_drvdata(dev);
316 unsigned int channel = sd_attr->index;
a9e9dd9c 317 struct ina3221_input *input = &ina->inputs[channel];
9ad0df1a 318 int val;
7cb6dcff
AD		 319 int ret;
320
9ad0df1a 321 ret = kstrtoint(buf, 0, &val);
7cb6dcff
AD		 322 if (ret)
323 return ret;
324
9ad0df1a 325 val = clamp_val(val, 1, INT_MAX);
7cb6dcff 326
a9e9dd9c 327 input->shunt_resistor = val;
7cb6dcff
AD		 328
329 return count;
330}
331
332static ssize_t ina3221_show_alert(struct device *dev,
333 struct device_attribute *attr, char *buf)
334{
335 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
336 struct ina3221_data *ina = dev_get_drvdata(dev);
337 unsigned int field = sd_attr->index;
338 unsigned int regval;
339 int ret;
340
341 ret = regmap_field_read(ina->fields[field], &regval);
342 if (ret)
343 return ret;
344
345 return snprintf(buf, PAGE_SIZE, "%d\n", regval);
346}
347
a9e9dd9c
NC		 348/* input channel label */
349static SENSOR_DEVICE_ATTR(in1_label, 0444,
350 ina3221_show_label, NULL, INA3221_CHANNEL1);
351static SENSOR_DEVICE_ATTR(in2_label, 0444,
352 ina3221_show_label, NULL, INA3221_CHANNEL2);
353static SENSOR_DEVICE_ATTR(in3_label, 0444,
354 ina3221_show_label, NULL, INA3221_CHANNEL3);
355
356/* voltage channel enable */
357static SENSOR_DEVICE_ATTR(in1_enable, 0644,
358 ina3221_show_enable, ina3221_set_enable, INA3221_CHANNEL1);
359static SENSOR_DEVICE_ATTR(in2_enable, 0644,
360 ina3221_show_enable, ina3221_set_enable, INA3221_CHANNEL2);
361static SENSOR_DEVICE_ATTR(in3_enable, 0644,
362 ina3221_show_enable, ina3221_set_enable, INA3221_CHANNEL3);
363
7cb6dcff
AD		 364/* bus voltage */
365static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO,
366 ina3221_show_bus_voltage, NULL, INA3221_BUS1);
367static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO,
368 ina3221_show_bus_voltage, NULL, INA3221_BUS2);
369static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO,
370 ina3221_show_bus_voltage, NULL, INA3221_BUS3);
371
372/* calculated current */
373static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO,
374 ina3221_show_current, NULL, INA3221_SHUNT1);
375static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO,
376 ina3221_show_current, NULL, INA3221_SHUNT2);
377static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO,
378 ina3221_show_current, NULL, INA3221_SHUNT3);
379
380/* shunt resistance */
381static SENSOR_DEVICE_ATTR(shunt1_resistor, S_IRUGO | S_IWUSR,
382 ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL1);
383static SENSOR_DEVICE_ATTR(shunt2_resistor, S_IRUGO | S_IWUSR,
384 ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL2);
385static SENSOR_DEVICE_ATTR(shunt3_resistor, S_IRUGO | S_IWUSR,
386 ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL3);
387
388/* critical current */
389static SENSOR_DEVICE_ATTR(curr1_crit, S_IRUGO | S_IWUSR,
390 ina3221_show_current, ina3221_set_current, INA3221_CRIT1);
391static SENSOR_DEVICE_ATTR(curr2_crit, S_IRUGO | S_IWUSR,
392 ina3221_show_current, ina3221_set_current, INA3221_CRIT2);
393static SENSOR_DEVICE_ATTR(curr3_crit, S_IRUGO | S_IWUSR,
394 ina3221_show_current, ina3221_set_current, INA3221_CRIT3);
395
396/* critical current alert */
397static SENSOR_DEVICE_ATTR(curr1_crit_alarm, S_IRUGO,
398 ina3221_show_alert, NULL, F_CF1);
399static SENSOR_DEVICE_ATTR(curr2_crit_alarm, S_IRUGO,
400 ina3221_show_alert, NULL, F_CF2);
401static SENSOR_DEVICE_ATTR(curr3_crit_alarm, S_IRUGO,
402 ina3221_show_alert, NULL, F_CF3);
403
404/* warning current */
405static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR,
406 ina3221_show_current, ina3221_set_current, INA3221_WARN1);
407static SENSOR_DEVICE_ATTR(curr2_max, S_IRUGO | S_IWUSR,
408 ina3221_show_current, ina3221_set_current, INA3221_WARN2);
409static SENSOR_DEVICE_ATTR(curr3_max, S_IRUGO | S_IWUSR,
410 ina3221_show_current, ina3221_set_current, INA3221_WARN3);
411
412/* warning current alert */
413static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO,
414 ina3221_show_alert, NULL, F_WF1);
415static SENSOR_DEVICE_ATTR(curr2_max_alarm, S_IRUGO,
416 ina3221_show_alert, NULL, F_WF2);
417static SENSOR_DEVICE_ATTR(curr3_max_alarm, S_IRUGO,
418 ina3221_show_alert, NULL, F_WF3);
419
420/* shunt voltage */
421static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO,
422 ina3221_show_shunt_voltage, NULL, INA3221_SHUNT1);
423static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO,
424 ina3221_show_shunt_voltage, NULL, INA3221_SHUNT2);
425static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO,
426 ina3221_show_shunt_voltage, NULL, INA3221_SHUNT3);
427
428static struct attribute *ina3221_attrs[] = {
a9e9dd9c
NC		 429 /* channel 1 -- make sure label at first */
430 &sensor_dev_attr_in1_label.dev_attr.attr,
431 &sensor_dev_attr_in1_enable.dev_attr.attr,
7cb6dcff
AD		 432 &sensor_dev_attr_in1_input.dev_attr.attr,
433 &sensor_dev_attr_curr1_input.dev_attr.attr,
434 &sensor_dev_attr_shunt1_resistor.dev_attr.attr,
435 &sensor_dev_attr_curr1_crit.dev_attr.attr,
436 &sensor_dev_attr_curr1_crit_alarm.dev_attr.attr,
437 &sensor_dev_attr_curr1_max.dev_attr.attr,
438 &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
439 &sensor_dev_attr_in4_input.dev_attr.attr,
440
a9e9dd9c
NC		 441 /* channel 2 -- make sure label at first */
442 &sensor_dev_attr_in2_label.dev_attr.attr,
443 &sensor_dev_attr_in2_enable.dev_attr.attr,
7cb6dcff
AD		 444 &sensor_dev_attr_in2_input.dev_attr.attr,
445 &sensor_dev_attr_curr2_input.dev_attr.attr,
446 &sensor_dev_attr_shunt2_resistor.dev_attr.attr,
447 &sensor_dev_attr_curr2_crit.dev_attr.attr,
448 &sensor_dev_attr_curr2_crit_alarm.dev_attr.attr,
449 &sensor_dev_attr_curr2_max.dev_attr.attr,
450 &sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
451 &sensor_dev_attr_in5_input.dev_attr.attr,
452
a9e9dd9c
NC		 453 /* channel 3 -- make sure label at first */
454 &sensor_dev_attr_in3_label.dev_attr.attr,
455 &sensor_dev_attr_in3_enable.dev_attr.attr,
7cb6dcff
AD		 456 &sensor_dev_attr_in3_input.dev_attr.attr,
457 &sensor_dev_attr_curr3_input.dev_attr.attr,
458 &sensor_dev_attr_shunt3_resistor.dev_attr.attr,
459 &sensor_dev_attr_curr3_crit.dev_attr.attr,
460 &sensor_dev_attr_curr3_crit_alarm.dev_attr.attr,
461 &sensor_dev_attr_curr3_max.dev_attr.attr,
462 &sensor_dev_attr_curr3_max_alarm.dev_attr.attr,
463 &sensor_dev_attr_in6_input.dev_attr.attr,
464
465 NULL,
466};
a9e9dd9c
NC		 467
468static umode_t ina3221_attr_is_visible(struct kobject *kobj,
469 struct attribute *attr, int n)
470{
471 const int max_attrs = ARRAY_SIZE(ina3221_attrs) - 1;
472 const int num_attrs = max_attrs / INA3221_NUM_CHANNELS;
473 struct device *dev = kobj_to_dev(kobj);
474 struct ina3221_data *ina = dev_get_drvdata(dev);
475 enum ina3221_channels channel = n / num_attrs;
476 struct ina3221_input *input = &ina->inputs[channel];
477 int index = n % num_attrs;
478
479 /* Hide label node if label is not provided */
480 if (index == 0 && !input->label)
481 return 0;
482
483 return attr->mode;
484}
485
486static const struct attribute_group ina3221_group = {
487 .is_visible = ina3221_attr_is_visible,
488 .attrs = ina3221_attrs,
489};
490__ATTRIBUTE_GROUPS(ina3221);
7cb6dcff
AD		 491
492static const struct regmap_range ina3221_yes_ranges[] = {
c20217b3 493 regmap_reg_range(INA3221_CONFIG, INA3221_BUS3),
7cb6dcff
AD		 494 regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE),
495};
496
497static const struct regmap_access_table ina3221_volatile_table = {
498 .yes_ranges = ina3221_yes_ranges,
499 .n_yes_ranges = ARRAY_SIZE(ina3221_yes_ranges),
500};
501
502static const struct regmap_config ina3221_regmap_config = {
503 .reg_bits = 8,
504 .val_bits = 16,
505
506 .cache_type = REGCACHE_RBTREE,
507 .volatile_table = &ina3221_volatile_table,
508};
509
a9e9dd9c
NC		 510static int ina3221_probe_child_from_dt(struct device *dev,
511 struct device_node *child,
512 struct ina3221_data *ina)
513{
514 struct ina3221_input *input;
515 u32 val;
516 int ret;
517
518 ret = of_property_read_u32(child, "reg", &val);
519 if (ret) {
520 dev_err(dev, "missing reg property of %s\n", child->name);
521 return ret;
522 } else if (val > INA3221_CHANNEL3) {
523 dev_err(dev, "invalid reg %d of %s\n", val, child->name);
524 return ret;
525 }
526
527 input = &ina->inputs[val];
528
529 /* Log the disconnected channel input */
530 if (!of_device_is_available(child)) {
531 input->disconnected = true;
532 return 0;
533 }
534
535 /* Save the connected input label if available */
536 of_property_read_string(child, "label", &input->label);
537
538 /* Overwrite default shunt resistor value optionally */
a6e43263
NC		 539 if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) {
540 if (val < 1 || val > INT_MAX) {
541 dev_err(dev, "invalid shunt resistor value %u of %s\n",
542 val, child->name);
543 return -EINVAL;
544 }
a9e9dd9c 545 input->shunt_resistor = val;
a6e43263 546 }
a9e9dd9c
NC		 547
548 return 0;
549}
550
551static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina)
552{
553 const struct device_node *np = dev->of_node;
554 struct device_node *child;
555 int ret;
556
557 /* Compatible with non-DT platforms */
558 if (!np)
559 return 0;
560
561 for_each_child_of_node(np, child) {
562 ret = ina3221_probe_child_from_dt(dev, child, ina);
563 if (ret)
564 return ret;
565 }
566
567 return 0;
568}
569
7cb6dcff
AD		 570static int ina3221_probe(struct i2c_client *client,
571 const struct i2c_device_id *id)
572{
573 struct device *dev = &client->dev;
574 struct ina3221_data *ina;
575 struct device *hwmon_dev;
576 int i, ret;
577
578 ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL);
579 if (!ina)
580 return -ENOMEM;
581
582 ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config);
583 if (IS_ERR(ina->regmap)) {
584 dev_err(dev, "Unable to allocate register map\n");
585 return PTR_ERR(ina->regmap);
586 }
587
588 for (i = 0; i < F_MAX_FIELDS; i++) {
589 ina->fields[i] = devm_regmap_field_alloc(dev,
590 ina->regmap,
591 ina3221_reg_fields[i]);
592 if (IS_ERR(ina->fields[i])) {
593 dev_err(dev, "Unable to allocate regmap fields\n");
594 return PTR_ERR(ina->fields[i]);
595 }
596 }
597
598 for (i = 0; i < INA3221_NUM_CHANNELS; i++)
a9e9dd9c
NC		 599 ina->inputs[i].shunt_resistor = INA3221_RSHUNT_DEFAULT;
600
601 ret = ina3221_probe_from_dt(dev, ina);
602 if (ret) {
603 dev_err(dev, "Unable to probe from device tree\n");
604 return ret;
605 }
7cb6dcff
AD		 606
607 ret = regmap_field_write(ina->fields[F_RST], true);
608 if (ret) {
609 dev_err(dev, "Unable to reset device\n");
610 return ret;
611 }
612
a9e9dd9c
NC		 613 /* Sync config register after reset */
614 ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
615 if (ret)
616 return ret;
617
618 /* Disable channels if their inputs are disconnected */
619 for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
620 if (ina->inputs[i].disconnected)
621 ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i);
622 }
623 ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
624 if (ret)
625 return ret;
626
59d608e1
NC		 627 dev_set_drvdata(dev, ina);
628
7cb6dcff
AD		 629 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
630 client->name,
631 ina, ina3221_groups);
632 if (IS_ERR(hwmon_dev)) {
633 dev_err(dev, "Unable to register hwmon device\n");
634 return PTR_ERR(hwmon_dev);
635 }
636
637 return 0;
638}
639
ead21c77 640static int __maybe_unused ina3221_suspend(struct device *dev)
59d608e1
NC		 641{
642 struct ina3221_data *ina = dev_get_drvdata(dev);
643 int ret;
644
645 /* Save config register value and enable cache-only */
646 ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
647 if (ret)
648 return ret;
649
650 /* Set to power-down mode for power saving */
651 ret = regmap_update_bits(ina->regmap, INA3221_CONFIG,
652 INA3221_CONFIG_MODE_MASK,
653 INA3221_CONFIG_MODE_POWERDOWN);
654 if (ret)
655 return ret;
656
657 regcache_cache_only(ina->regmap, true);
658 regcache_mark_dirty(ina->regmap);
659
660 return 0;
661}
662
ead21c77 663static int __maybe_unused ina3221_resume(struct device *dev)
59d608e1
NC		 664{
665 struct ina3221_data *ina = dev_get_drvdata(dev);
666 int ret;
667
668 regcache_cache_only(ina->regmap, false);
669
670 /* Software reset the chip */
671 ret = regmap_field_write(ina->fields[F_RST], true);
672 if (ret) {
673 dev_err(dev, "Unable to reset device\n");
674 return ret;
675 }
676
677 /* Restore cached register values to hardware */
678 ret = regcache_sync(ina->regmap);
679 if (ret)
680 return ret;
681
682 /* Restore config register value to hardware */
683 ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
684 if (ret)
685 return ret;
686
687 return 0;
688}
59d608e1
NC		 689
690static const struct dev_pm_ops ina3221_pm = {
691 SET_SYSTEM_SLEEP_PM_OPS(ina3221_suspend, ina3221_resume)
692};
693
7cb6dcff
AD		 694static const struct of_device_id ina3221_of_match_table[] = {
695 { .compatible = "ti,ina3221", },
696 { /* sentinel */ }
697};
698MODULE_DEVICE_TABLE(of, ina3221_of_match_table);
699
700static const struct i2c_device_id ina3221_ids[] = {
701 { "ina3221", 0 },
702 { /* sentinel */ }
703};
704MODULE_DEVICE_TABLE(i2c, ina3221_ids);
705
706static struct i2c_driver ina3221_i2c_driver = {
707 .probe = ina3221_probe,
708 .driver = {
709 .name = INA3221_DRIVER_NAME,
710 .of_match_table = ina3221_of_match_table,
59d608e1 711 .pm = &ina3221_pm,
7cb6dcff
AD		 712 },
713 .id_table = ina3221_ids,
714};
715module_i2c_driver(ina3221_i2c_driver);
716
717MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
718MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver");
719MODULE_LICENSE("GPL v2");
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