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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/hwmon/ina2xx.c
....@@ -1,28 +1,25 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Driver for Texas Instruments INA219, INA226 power monitor chips
34  *
45  * INA219:
56  * Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
6
- * Datasheet: http://www.ti.com/product/ina219
7
+ * Datasheet: https://www.ti.com/product/ina219
78  *
89  * INA220:
910  * Bi-Directional Current/Power Monitor with I2C Interface
10
- * Datasheet: http://www.ti.com/product/ina220
11
+ * Datasheet: https://www.ti.com/product/ina220
1112  *
1213  * INA226:
1314  * Bi-Directional Current/Power Monitor with I2C Interface
14
- * Datasheet: http://www.ti.com/product/ina226
15
+ * Datasheet: https://www.ti.com/product/ina226
1516  *
1617  * INA230:
1718  * Bi-directional Current/Power Monitor with I2C Interface
18
- * Datasheet: http://www.ti.com/product/ina230
19
+ * Datasheet: https://www.ti.com/product/ina230
1920  *
2021  * Copyright (C) 2012 Lothar Felten <lothar.felten@gmail.com>
2122  * Thanks to Jan Volkering
22
- *
23
- * This program is free software; you can redistribute it and/or modify
24
- * it under the terms of the GNU General Public License as published by
25
- * the Free Software Foundation; version 2 of the License.
2623  */
2724 
2825 #include <linux/kernel.h>
....@@ -76,6 +73,17 @@
7673 
7774 #define INA226_READ_AVG(reg)		(((reg) & INA226_AVG_RD_MASK) >> 9)
7875 #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)
7987 
8088 /* common attrs, ina226 attrs and NULL */
8189 #define INA2XX_MAX_ATTRIBUTE_GROUPS	3
....@@ -140,7 +148,7 @@
140148  * Available averaging rates for ina226. The indices correspond with
141149  * the bit values expected by the chip (according to the ina226 datasheet,
142150  * table 3 AVG bit settings, found at
143
- * http://www.ti.com/lit/ds/symlink/ina226.pdf.
151
+ * https://www.ti.com/lit/ds/symlink/ina226.pdf.
144152  */
145153 static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
146154 
....@@ -290,7 +298,7 @@
290298 	return val;
291299 }
292300 
293
-static ssize_t ina2xx_show_value(struct device *dev,
301
+static ssize_t ina2xx_value_show(struct device *dev,
294302 				 struct device_attribute *da, char *buf)
295303 {
296304 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
....@@ -304,6 +312,145 @@
304312 
305313 	return snprintf(buf, PAGE_SIZE, "%d\n",
306314 			ina2xx_get_value(data, attr->index, regval));
315
+}
316
+
317
+static int ina226_reg_to_alert(struct ina2xx_data *data, u8 bit, u16 regval)
318
+{
319
+	int reg;
320
+
321
+	switch (bit) {
322
+	case INA226_SHUNT_OVER_VOLTAGE_BIT:
323
+	case INA226_SHUNT_UNDER_VOLTAGE_BIT:
324
+		reg = INA2XX_SHUNT_VOLTAGE;
325
+		break;
326
+	case INA226_BUS_OVER_VOLTAGE_BIT:
327
+	case INA226_BUS_UNDER_VOLTAGE_BIT:
328
+		reg = INA2XX_BUS_VOLTAGE;
329
+		break;
330
+	case INA226_POWER_OVER_LIMIT_BIT:
331
+		reg = INA2XX_POWER;
332
+		break;
333
+	default:
334
+		/* programmer goofed */
335
+		WARN_ON_ONCE(1);
336
+		return 0;
337
+	}
338
+
339
+	return ina2xx_get_value(data, reg, regval);
340
+}
341
+
342
+/*
343
+ * Turns alert limit values into register values.
344
+ * Opposite of the formula in ina2xx_get_value().
345
+ */
346
+static s16 ina226_alert_to_reg(struct ina2xx_data *data, u8 bit, int val)
347
+{
348
+	switch (bit) {
349
+	case INA226_SHUNT_OVER_VOLTAGE_BIT:
350
+	case INA226_SHUNT_UNDER_VOLTAGE_BIT:
351
+		val *= data->config->shunt_div;
352
+		return clamp_val(val, SHRT_MIN, SHRT_MAX);
353
+	case INA226_BUS_OVER_VOLTAGE_BIT:
354
+	case INA226_BUS_UNDER_VOLTAGE_BIT:
355
+		val = (val * 1000) << data->config->bus_voltage_shift;
356
+		val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);
357
+		return clamp_val(val, 0, SHRT_MAX);
358
+	case INA226_POWER_OVER_LIMIT_BIT:
359
+		val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);
360
+		return clamp_val(val, 0, USHRT_MAX);
361
+	default:
362
+		/* programmer goofed */
363
+		WARN_ON_ONCE(1);
364
+		return 0;
365
+	}
366
+}
367
+
368
+static ssize_t ina226_alert_show(struct device *dev,
369
+				 struct device_attribute *da, char *buf)
370
+{
371
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
372
+	struct ina2xx_data *data = dev_get_drvdata(dev);
373
+	int regval;
374
+	int val = 0;
375
+	int ret;
376
+
377
+	mutex_lock(&data->config_lock);
378
+	ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
379
+	if (ret)
380
+		goto abort;
381
+
382
+	if (regval & BIT(attr->index)) {
383
+		ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, &regval);
384
+		if (ret)
385
+			goto abort;
386
+		val = ina226_reg_to_alert(data, attr->index, regval);
387
+	}
388
+
389
+	ret = snprintf(buf, PAGE_SIZE, "%d\n", val);
390
+abort:
391
+	mutex_unlock(&data->config_lock);
392
+	return ret;
393
+}
394
+
395
+static ssize_t ina226_alert_store(struct device *dev,
396
+				  struct device_attribute *da,
397
+				  const char *buf, size_t count)
398
+{
399
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
400
+	struct ina2xx_data *data = dev_get_drvdata(dev);
401
+	unsigned long val;
402
+	int ret;
403
+
404
+	ret = kstrtoul(buf, 10, &val);
405
+	if (ret < 0)
406
+		return ret;
407
+
408
+	/*
409
+	 * Clear all alerts first to avoid accidentally triggering ALERT pin
410
+	 * due to register write sequence. Then, only enable the alert
411
+	 * if the value is non-zero.
412
+	 */
413
+	mutex_lock(&data->config_lock);
414
+	ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
415
+				 INA226_ALERT_CONFIG_MASK, 0);
416
+	if (ret < 0)
417
+		goto abort;
418
+
419
+	ret = regmap_write(data->regmap, INA226_ALERT_LIMIT,
420
+			   ina226_alert_to_reg(data, attr->index, val));
421
+	if (ret < 0)
422
+		goto abort;
423
+
424
+	if (val != 0) {
425
+		ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
426
+					 INA226_ALERT_CONFIG_MASK,
427
+					 BIT(attr->index));
428
+		if (ret < 0)
429
+			goto abort;
430
+	}
431
+
432
+	ret = count;
433
+abort:
434
+	mutex_unlock(&data->config_lock);
435
+	return ret;
436
+}
437
+
438
+static ssize_t ina226_alarm_show(struct device *dev,
439
+				 struct device_attribute *da, char *buf)
440
+{
441
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
442
+	struct ina2xx_data *data = dev_get_drvdata(dev);
443
+	int regval;
444
+	int alarm = 0;
445
+	int ret;
446
+
447
+	ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
448
+	if (ret)
449
+		return ret;
450
+
451
+	alarm = (regval & BIT(attr->index)) &&
452
+		(regval & INA226_ALERT_FUNCTION_FLAG);
453
+	return snprintf(buf, PAGE_SIZE, "%d\n", alarm);
307454 }
308455 
309456 /*
....@@ -329,16 +476,15 @@
329476 	return 0;
330477 }
331478 
332
-static ssize_t ina2xx_show_shunt(struct device *dev,
333
-			      struct device_attribute *da,
334
-			      char *buf)
479
+static ssize_t ina2xx_shunt_show(struct device *dev,
480
+				 struct device_attribute *da, char *buf)
335481 {
336482 	struct ina2xx_data *data = dev_get_drvdata(dev);
337483 
338484 	return snprintf(buf, PAGE_SIZE, "%li\n", data->rshunt);
339485 }
340486 
341
-static ssize_t ina2xx_store_shunt(struct device *dev,
487
+static ssize_t ina2xx_shunt_store(struct device *dev,
342488 				  struct device_attribute *da,
343489 				  const char *buf, size_t count)
344490 {
....@@ -356,9 +502,9 @@
356502 	return count;
357503 }
358504 
359
-static ssize_t ina226_set_interval(struct device *dev,
360
-				   struct device_attribute *da,
361
-				   const char *buf, size_t count)
505
+static ssize_t ina226_interval_store(struct device *dev,
506
+				     struct device_attribute *da,
507
+				     const char *buf, size_t count)
362508 {
363509 	struct ina2xx_data *data = dev_get_drvdata(dev);
364510 	unsigned long val;
....@@ -380,7 +526,7 @@
380526 	return count;
381527 }
382528 
383
-static ssize_t ina226_show_interval(struct device *dev,
529
+static ssize_t ina226_interval_show(struct device *dev,
384530 				    struct device_attribute *da, char *buf)
385531 {
386532 	struct ina2xx_data *data = dev_get_drvdata(dev);
....@@ -395,29 +541,45 @@
395541 }
396542 
397543 /* shunt voltage */
398
-static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina2xx_show_value, NULL,
399
-			  INA2XX_SHUNT_VOLTAGE);
544
+static SENSOR_DEVICE_ATTR_RO(in0_input, ina2xx_value, INA2XX_SHUNT_VOLTAGE);
545
+/* shunt voltage over/under voltage alert setting and alarm */
546
+static SENSOR_DEVICE_ATTR_RW(in0_crit, ina226_alert,
547
+			     INA226_SHUNT_OVER_VOLTAGE_BIT);
548
+static SENSOR_DEVICE_ATTR_RW(in0_lcrit, ina226_alert,
549
+			     INA226_SHUNT_UNDER_VOLTAGE_BIT);
550
+static SENSOR_DEVICE_ATTR_RO(in0_crit_alarm, ina226_alarm,
551
+			     INA226_SHUNT_OVER_VOLTAGE_BIT);
552
+static SENSOR_DEVICE_ATTR_RO(in0_lcrit_alarm, ina226_alarm,
553
+			     INA226_SHUNT_UNDER_VOLTAGE_BIT);
400554 
401555 /* bus voltage */
402
-static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina2xx_show_value, NULL,
403
-			  INA2XX_BUS_VOLTAGE);
556
+static SENSOR_DEVICE_ATTR_RO(in1_input, ina2xx_value, INA2XX_BUS_VOLTAGE);
557
+/* bus voltage over/under voltage alert setting and alarm */
558
+static SENSOR_DEVICE_ATTR_RW(in1_crit, ina226_alert,
559
+			     INA226_BUS_OVER_VOLTAGE_BIT);
560
+static SENSOR_DEVICE_ATTR_RW(in1_lcrit, ina226_alert,
561
+			     INA226_BUS_UNDER_VOLTAGE_BIT);
562
+static SENSOR_DEVICE_ATTR_RO(in1_crit_alarm, ina226_alarm,
563
+			     INA226_BUS_OVER_VOLTAGE_BIT);
564
+static SENSOR_DEVICE_ATTR_RO(in1_lcrit_alarm, ina226_alarm,
565
+			     INA226_BUS_UNDER_VOLTAGE_BIT);
404566 
405567 /* calculated current */
406
-static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina2xx_show_value, NULL,
407
-			  INA2XX_CURRENT);
568
+static SENSOR_DEVICE_ATTR_RO(curr1_input, ina2xx_value, INA2XX_CURRENT);
408569 
409570 /* calculated power */
410
-static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL,
411
-			  INA2XX_POWER);
571
+static SENSOR_DEVICE_ATTR_RO(power1_input, ina2xx_value, INA2XX_POWER);
572
+/* over-limit power alert setting and alarm */
573
+static SENSOR_DEVICE_ATTR_RW(power1_crit, ina226_alert,
574
+			     INA226_POWER_OVER_LIMIT_BIT);
575
+static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina226_alarm,
576
+			     INA226_POWER_OVER_LIMIT_BIT);
412577 
413578 /* shunt resistance */
414
-static SENSOR_DEVICE_ATTR(shunt_resistor, S_IRUGO | S_IWUSR,
415
-			  ina2xx_show_shunt, ina2xx_store_shunt,
416
-			  INA2XX_CALIBRATION);
579
+static SENSOR_DEVICE_ATTR_RW(shunt_resistor, ina2xx_shunt, INA2XX_CALIBRATION);
417580 
418581 /* update interval (ina226 only) */
419
-static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR,
420
-			  ina226_show_interval, ina226_set_interval, 0);
582
+static SENSOR_DEVICE_ATTR_RW(update_interval, ina226_interval, 0);
421583 
422584 /* pointers to created device attributes */
423585 static struct attribute *ina2xx_attrs[] = {
....@@ -434,6 +596,16 @@
434596 };
435597 
436598 static struct attribute *ina226_attrs[] = {
599
+	&sensor_dev_attr_in0_crit.dev_attr.attr,
600
+	&sensor_dev_attr_in0_lcrit.dev_attr.attr,
601
+	&sensor_dev_attr_in0_crit_alarm.dev_attr.attr,
602
+	&sensor_dev_attr_in0_lcrit_alarm.dev_attr.attr,
603
+	&sensor_dev_attr_in1_crit.dev_attr.attr,
604
+	&sensor_dev_attr_in1_lcrit.dev_attr.attr,
605
+	&sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
606
+	&sensor_dev_attr_in1_lcrit_alarm.dev_attr.attr,
607
+	&sensor_dev_attr_power1_crit.dev_attr.attr,
608
+	&sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
437609 	&sensor_dev_attr_update_interval.dev_attr.attr,
438610 	NULL,
439611 };
....@@ -442,8 +614,9 @@
442614 	.attrs = ina226_attrs,
443615 };
444616 
445
-static int ina2xx_probe(struct i2c_client *client,
446
-			const struct i2c_device_id *id)
617
+static const struct i2c_device_id ina2xx_id[];
618
+
619
+static int ina2xx_probe(struct i2c_client *client)
447620 {
448621 	struct device *dev = &client->dev;
449622 	struct ina2xx_data *data;
....@@ -455,7 +628,7 @@
455628 	if (client->dev.of_node)
456629 		chip = (enum ina2xx_ids)of_device_get_match_data(&client->dev);
457630 	else
458
-		chip = id->driver_data;
631
+		chip = i2c_match_id(ina2xx_id, client)->driver_data;
459632 
460633 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
461634 	if (!data)
....@@ -515,7 +688,7 @@
515688 };
516689 MODULE_DEVICE_TABLE(i2c, ina2xx_id);
517690 
518
-static const struct of_device_id ina2xx_of_match[] = {
691
+static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
519692 	{
520693 		.compatible = "ti,ina219",
521694 		.data = (void *)ina219
....@@ -545,7 +718,7 @@
545718 		.name	= "ina2xx",
546719 		.of_match_table = of_match_ptr(ina2xx_of_match),
547720 	},
548
-	.probe		= ina2xx_probe,
721
+	.probe_new	= ina2xx_probe,
549722 	.id_table	= ina2xx_id,
550723 };
551724