This source file includes following definitions.
- ina226_reg_to_interval
- ina226_interval_to_reg
- ina2xx_calibrate
- ina2xx_init
- ina2xx_read_reg
- ina2xx_get_value
- ina2xx_value_show
- ina2xx_set_shunt
- ina2xx_shunt_show
- ina2xx_shunt_store
- ina226_interval_store
- ina226_interval_show
- ina2xx_probe
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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
43 #define INA2XX_CONFIG 0x00
44 #define INA2XX_SHUNT_VOLTAGE 0x01
45 #define INA2XX_BUS_VOLTAGE 0x02
46 #define INA2XX_POWER 0x03
47 #define INA2XX_CURRENT 0x04
48 #define INA2XX_CALIBRATION 0x05
49
50
51 #define INA226_MASK_ENABLE 0x06
52 #define INA226_ALERT_LIMIT 0x07
53 #define INA226_DIE_ID 0xFF
54
55
56 #define INA219_REGISTERS 6
57 #define INA226_REGISTERS 8
58
59 #define INA2XX_MAX_REGISTERS 8
60
61
62 #define INA219_CONFIG_DEFAULT 0x399F
63 #define INA226_CONFIG_DEFAULT 0x4527
64
65
66 #define INA2XX_CONVERSION_RATE 15
67 #define INA2XX_MAX_DELAY 69
68
69 #define INA2XX_RSHUNT_DEFAULT 10000
70
71
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
78 #define INA2XX_MAX_ATTRIBUTE_GROUPS 3
79
80
81
82
83
84 #define INA226_TOTAL_CONV_TIME_DEFAULT 2200
85
86 static struct regmap_config ina2xx_regmap_config = {
87 .reg_bits = 8,
88 .val_bits = 16,
89 };
90
91 enum ina2xx_ids { ina219, ina226 };
92
93 struct ina2xx_config {
94 u16 config_default;
95 int calibration_value;
96 int registers;
97 int shunt_div;
98 int bus_voltage_shift;
99 int bus_voltage_lsb;
100 int power_lsb_factor;
101 };
102
103 struct ina2xx_data {
104 const struct ina2xx_config *config;
105
106 long rshunt;
107 long current_lsb_uA;
108 long power_lsb_uW;
109 struct mutex config_lock;
110 struct regmap *regmap;
111
112 const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
113 };
114
115 static const struct ina2xx_config ina2xx_config[] = {
116 [ina219] = {
117 .config_default = INA219_CONFIG_DEFAULT,
118 .calibration_value = 4096,
119 .registers = INA219_REGISTERS,
120 .shunt_div = 100,
121 .bus_voltage_shift = 3,
122 .bus_voltage_lsb = 4000,
123 .power_lsb_factor = 20,
124 },
125 [ina226] = {
126 .config_default = INA226_CONFIG_DEFAULT,
127 .calibration_value = 2048,
128 .registers = INA226_REGISTERS,
129 .shunt_div = 400,
130 .bus_voltage_shift = 0,
131 .bus_voltage_lsb = 1250,
132 .power_lsb_factor = 25,
133 },
134 };
135
136
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139
140
141
142 static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
143
144 static int ina226_reg_to_interval(u16 config)
145 {
146 int avg = ina226_avg_tab[INA226_READ_AVG(config)];
147
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150
151
152 return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000);
153 }
154
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157
158
159 static u16 ina226_interval_to_reg(int interval)
160 {
161 int avg, avg_bits;
162
163 avg = DIV_ROUND_CLOSEST(interval * 1000,
164 INA226_TOTAL_CONV_TIME_DEFAULT);
165 avg_bits = find_closest(avg, ina226_avg_tab,
166 ARRAY_SIZE(ina226_avg_tab));
167
168 return INA226_SHIFT_AVG(avg_bits);
169 }
170
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175
176
177 static int ina2xx_calibrate(struct ina2xx_data *data)
178 {
179 return regmap_write(data->regmap, INA2XX_CALIBRATION,
180 data->config->calibration_value);
181 }
182
183
184
185
186 static int ina2xx_init(struct ina2xx_data *data)
187 {
188 int ret = regmap_write(data->regmap, INA2XX_CONFIG,
189 data->config->config_default);
190 if (ret < 0)
191 return ret;
192
193 return ina2xx_calibrate(data);
194 }
195
196 static int ina2xx_read_reg(struct device *dev, int reg, unsigned int *regval)
197 {
198 struct ina2xx_data *data = dev_get_drvdata(dev);
199 int ret, retry;
200
201 dev_dbg(dev, "Starting register %d read\n", reg);
202
203 for (retry = 5; retry; retry--) {
204
205 ret = regmap_read(data->regmap, reg, regval);
206 if (ret < 0)
207 return ret;
208
209 dev_dbg(dev, "read %d, val = 0x%04x\n", reg, *regval);
210
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214
215
216
217
218
219 if (*regval == 0) {
220 unsigned int cal;
221
222 ret = regmap_read(data->regmap, INA2XX_CALIBRATION,
223 &cal);
224 if (ret < 0)
225 return ret;
226
227 if (cal == 0) {
228 dev_warn(dev, "chip not calibrated, reinitializing\n");
229
230 ret = ina2xx_init(data);
231 if (ret < 0)
232 return ret;
233
234
235
236
237
238 msleep(INA2XX_MAX_DELAY);
239 continue;
240 }
241 }
242 return 0;
243 }
244
245
246
247
248
249
250 dev_err(dev, "unable to reinitialize the chip\n");
251 return -ENODEV;
252 }
253
254 static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
255 unsigned int regval)
256 {
257 int val;
258
259 switch (reg) {
260 case INA2XX_SHUNT_VOLTAGE:
261
262 val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);
263 break;
264 case INA2XX_BUS_VOLTAGE:
265 val = (regval >> data->config->bus_voltage_shift)
266 * data->config->bus_voltage_lsb;
267 val = DIV_ROUND_CLOSEST(val, 1000);
268 break;
269 case INA2XX_POWER:
270 val = regval * data->power_lsb_uW;
271 break;
272 case INA2XX_CURRENT:
273
274 val = (s16)regval * data->current_lsb_uA;
275 val = DIV_ROUND_CLOSEST(val, 1000);
276 break;
277 case INA2XX_CALIBRATION:
278 val = regval;
279 break;
280 default:
281
282 WARN_ON_ONCE(1);
283 val = 0;
284 break;
285 }
286
287 return val;
288 }
289
290 static ssize_t ina2xx_value_show(struct device *dev,
291 struct device_attribute *da, char *buf)
292 {
293 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
294 struct ina2xx_data *data = dev_get_drvdata(dev);
295 unsigned int regval;
296
297 int err = ina2xx_read_reg(dev, attr->index, ®val);
298
299 if (err < 0)
300 return err;
301
302 return snprintf(buf, PAGE_SIZE, "%d\n",
303 ina2xx_get_value(data, attr->index, regval));
304 }
305
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308
309
310
311
312 static int ina2xx_set_shunt(struct ina2xx_data *data, long val)
313 {
314 unsigned int dividend = DIV_ROUND_CLOSEST(1000000000,
315 data->config->shunt_div);
316 if (val <= 0 || val > dividend)
317 return -EINVAL;
318
319 mutex_lock(&data->config_lock);
320 data->rshunt = val;
321 data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);
322 data->power_lsb_uW = data->config->power_lsb_factor *
323 data->current_lsb_uA;
324 mutex_unlock(&data->config_lock);
325
326 return 0;
327 }
328
329 static ssize_t ina2xx_shunt_show(struct device *dev,
330 struct device_attribute *da, char *buf)
331 {
332 struct ina2xx_data *data = dev_get_drvdata(dev);
333
334 return snprintf(buf, PAGE_SIZE, "%li\n", data->rshunt);
335 }
336
337 static ssize_t ina2xx_shunt_store(struct device *dev,
338 struct device_attribute *da,
339 const char *buf, size_t count)
340 {
341 unsigned long val;
342 int status;
343 struct ina2xx_data *data = dev_get_drvdata(dev);
344
345 status = kstrtoul(buf, 10, &val);
346 if (status < 0)
347 return status;
348
349 status = ina2xx_set_shunt(data, val);
350 if (status < 0)
351 return status;
352 return count;
353 }
354
355 static ssize_t ina226_interval_store(struct device *dev,
356 struct device_attribute *da,
357 const char *buf, size_t count)
358 {
359 struct ina2xx_data *data = dev_get_drvdata(dev);
360 unsigned long val;
361 int status;
362
363 status = kstrtoul(buf, 10, &val);
364 if (status < 0)
365 return status;
366
367 if (val > INT_MAX || val == 0)
368 return -EINVAL;
369
370 status = regmap_update_bits(data->regmap, INA2XX_CONFIG,
371 INA226_AVG_RD_MASK,
372 ina226_interval_to_reg(val));
373 if (status < 0)
374 return status;
375
376 return count;
377 }
378
379 static ssize_t ina226_interval_show(struct device *dev,
380 struct device_attribute *da, char *buf)
381 {
382 struct ina2xx_data *data = dev_get_drvdata(dev);
383 int status;
384 unsigned int regval;
385
386 status = regmap_read(data->regmap, INA2XX_CONFIG, ®val);
387 if (status)
388 return status;
389
390 return snprintf(buf, PAGE_SIZE, "%d\n", ina226_reg_to_interval(regval));
391 }
392
393
394 static SENSOR_DEVICE_ATTR_RO(in0_input, ina2xx_value, INA2XX_SHUNT_VOLTAGE);
395
396
397 static SENSOR_DEVICE_ATTR_RO(in1_input, ina2xx_value, INA2XX_BUS_VOLTAGE);
398
399
400 static SENSOR_DEVICE_ATTR_RO(curr1_input, ina2xx_value, INA2XX_CURRENT);
401
402
403 static SENSOR_DEVICE_ATTR_RO(power1_input, ina2xx_value, INA2XX_POWER);
404
405
406 static SENSOR_DEVICE_ATTR_RW(shunt_resistor, ina2xx_shunt, INA2XX_CALIBRATION);
407
408
409 static SENSOR_DEVICE_ATTR_RW(update_interval, ina226_interval, 0);
410
411
412 static struct attribute *ina2xx_attrs[] = {
413 &sensor_dev_attr_in0_input.dev_attr.attr,
414 &sensor_dev_attr_in1_input.dev_attr.attr,
415 &sensor_dev_attr_curr1_input.dev_attr.attr,
416 &sensor_dev_attr_power1_input.dev_attr.attr,
417 &sensor_dev_attr_shunt_resistor.dev_attr.attr,
418 NULL,
419 };
420
421 static const struct attribute_group ina2xx_group = {
422 .attrs = ina2xx_attrs,
423 };
424
425 static struct attribute *ina226_attrs[] = {
426 &sensor_dev_attr_update_interval.dev_attr.attr,
427 NULL,
428 };
429
430 static const struct attribute_group ina226_group = {
431 .attrs = ina226_attrs,
432 };
433
434 static int ina2xx_probe(struct i2c_client *client,
435 const struct i2c_device_id *id)
436 {
437 struct device *dev = &client->dev;
438 struct ina2xx_data *data;
439 struct device *hwmon_dev;
440 u32 val;
441 int ret, group = 0;
442 enum ina2xx_ids chip;
443
444 if (client->dev.of_node)
445 chip = (enum ina2xx_ids)of_device_get_match_data(&client->dev);
446 else
447 chip = id->driver_data;
448
449 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
450 if (!data)
451 return -ENOMEM;
452
453
454 data->config = &ina2xx_config[chip];
455 mutex_init(&data->config_lock);
456
457 if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
458 struct ina2xx_platform_data *pdata = dev_get_platdata(dev);
459
460 if (pdata)
461 val = pdata->shunt_uohms;
462 else
463 val = INA2XX_RSHUNT_DEFAULT;
464 }
465
466 ina2xx_set_shunt(data, val);
467
468 ina2xx_regmap_config.max_register = data->config->registers;
469
470 data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);
471 if (IS_ERR(data->regmap)) {
472 dev_err(dev, "failed to allocate register map\n");
473 return PTR_ERR(data->regmap);
474 }
475
476 ret = ina2xx_init(data);
477 if (ret < 0) {
478 dev_err(dev, "error configuring the device: %d\n", ret);
479 return -ENODEV;
480 }
481
482 data->groups[group++] = &ina2xx_group;
483 if (chip == ina226)
484 data->groups[group++] = &ina226_group;
485
486 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
487 data, data->groups);
488 if (IS_ERR(hwmon_dev))
489 return PTR_ERR(hwmon_dev);
490
491 dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
492 client->name, data->rshunt);
493
494 return 0;
495 }
496
497 static const struct i2c_device_id ina2xx_id[] = {
498 { "ina219", ina219 },
499 { "ina220", ina219 },
500 { "ina226", ina226 },
501 { "ina230", ina226 },
502 { "ina231", ina226 },
503 { }
504 };
505 MODULE_DEVICE_TABLE(i2c, ina2xx_id);
506
507 static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
508 {
509 .compatible = "ti,ina219",
510 .data = (void *)ina219
511 },
512 {
513 .compatible = "ti,ina220",
514 .data = (void *)ina219
515 },
516 {
517 .compatible = "ti,ina226",
518 .data = (void *)ina226
519 },
520 {
521 .compatible = "ti,ina230",
522 .data = (void *)ina226
523 },
524 {
525 .compatible = "ti,ina231",
526 .data = (void *)ina226
527 },
528 { },
529 };
530 MODULE_DEVICE_TABLE(of, ina2xx_of_match);
531
532 static struct i2c_driver ina2xx_driver = {
533 .driver = {
534 .name = "ina2xx",
535 .of_match_table = of_match_ptr(ina2xx_of_match),
536 },
537 .probe = ina2xx_probe,
538 .id_table = ina2xx_id,
539 };
540
541 module_i2c_driver(ina2xx_driver);
542
543 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
544 MODULE_DESCRIPTION("ina2xx driver");
545 MODULE_LICENSE("GPL");