Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 556 insertions, 0 deletions

diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c
new file mode 100644
index 000000000..07ee19573
--- /dev/null
+++ b/drivers/hwmon/ina2xx.c
@@ -0,0 +1,556 @@
+/*
+ * Driver for Texas Instruments INA219, INA226 power monitor chips
+ *
+ * INA219:
+ * Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
+ * Datasheet: http://www.ti.com/product/ina219
+ *
+ * INA220:
+ * Bi-Directional Current/Power Monitor with I2C Interface
+ * Datasheet: http://www.ti.com/product/ina220
+ *
+ * INA226:
+ * Bi-Directional Current/Power Monitor with I2C Interface
+ * Datasheet: http://www.ti.com/product/ina226
+ *
+ * INA230:
+ * Bi-directional Current/Power Monitor with I2C Interface
+ * Datasheet: http://www.ti.com/product/ina230
+ *
+ * Copyright (C) 2012 Lothar Felten <lothar.felten@gmail.com>
+ * Thanks to Jan Volkering
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/jiffies.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/util_macros.h>
+#include <linux/regmap.h>
+
+#include <linux/platform_data/ina2xx.h>
+
+/* common register definitions */
+#define INA2XX_CONFIG			0x00
+#define INA2XX_SHUNT_VOLTAGE		0x01 /* readonly */
+#define INA2XX_BUS_VOLTAGE		0x02 /* readonly */
+#define INA2XX_POWER			0x03 /* readonly */
+#define INA2XX_CURRENT			0x04 /* readonly */
+#define INA2XX_CALIBRATION		0x05
+
+/* INA226 register definitions */
+#define INA226_MASK_ENABLE		0x06
+#define INA226_ALERT_LIMIT		0x07
+#define INA226_DIE_ID			0xFF
+
+/* register count */
+#define INA219_REGISTERS		6
+#define INA226_REGISTERS		8
+
+#define INA2XX_MAX_REGISTERS		8
+
+/* settings - depend on use case */
+#define INA219_CONFIG_DEFAULT		0x399F	/* PGA=8 */
+#define INA226_CONFIG_DEFAULT		0x4527	/* averages=16 */
+
+/* worst case is 68.10 ms (~14.6Hz, ina219) */
+#define INA2XX_CONVERSION_RATE		15
+#define INA2XX_MAX_DELAY		69 /* worst case delay in ms */
+
+#define INA2XX_RSHUNT_DEFAULT		10000
+
+/* bit mask for reading the averaging setting in the configuration register */
+#define INA226_AVG_RD_MASK		0x0E00
+
+#define INA226_READ_AVG(reg)		(((reg) & INA226_AVG_RD_MASK) >> 9)
+#define INA226_SHIFT_AVG(val)		((val) << 9)
+
+/* common attrs, ina226 attrs and NULL */
+#define INA2XX_MAX_ATTRIBUTE_GROUPS	3
+
+/*
+ * Both bus voltage and shunt voltage conversion times for ina226 are set
+ * to 0b0100 on POR, which translates to 2200 microseconds in total.
+ */
+#define INA226_TOTAL_CONV_TIME_DEFAULT	2200
+
+static struct regmap_config ina2xx_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+};
+
+enum ina2xx_ids { ina219, ina226 };
+
+struct ina2xx_config {
+	u16 config_default;
+	int calibration_value;
+	int registers;
+	int shunt_div;
+	int bus_voltage_shift;
+	int bus_voltage_lsb;	/* uV */
+	int power_lsb_factor;
+};
+
+struct ina2xx_data {
+	const struct ina2xx_config *config;
+
+	long rshunt;
+	long current_lsb_uA;
+	long power_lsb_uW;
+	struct mutex config_lock;
+	struct regmap *regmap;
+
+	const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
+};
+
+static const struct ina2xx_config ina2xx_config[] = {
+	[ina219] = {
+		.config_default = INA219_CONFIG_DEFAULT,
+		.calibration_value = 4096,
+		.registers = INA219_REGISTERS,
+		.shunt_div = 100,
+		.bus_voltage_shift = 3,
+		.bus_voltage_lsb = 4000,
+		.power_lsb_factor = 20,
+	},
+	[ina226] = {
+		.config_default = INA226_CONFIG_DEFAULT,
+		.calibration_value = 2048,
+		.registers = INA226_REGISTERS,
+		.shunt_div = 400,
+		.bus_voltage_shift = 0,
+		.bus_voltage_lsb = 1250,
+		.power_lsb_factor = 25,
+	},
+};
+
+/*
+ * Available averaging rates for ina226. The indices correspond with
+ * the bit values expected by the chip (according to the ina226 datasheet,
+ * table 3 AVG bit settings, found at
+ * http://www.ti.com/lit/ds/symlink/ina226.pdf.
+ */
+static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
+
+static int ina226_reg_to_interval(u16 config)
+{
+	int avg = ina226_avg_tab[INA226_READ_AVG(config)];
+
+	/*
+	 * Multiply the total conversion time by the number of averages.
+	 * Return the result in milliseconds.
+	 */
+	return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000);
+}
+
+/*
+ * Return the new, shifted AVG field value of CONFIG register,
+ * to use with regmap_update_bits
+ */
+static u16 ina226_interval_to_reg(int interval)
+{
+	int avg, avg_bits;
+
+	avg = DIV_ROUND_CLOSEST(interval * 1000,
+				INA226_TOTAL_CONV_TIME_DEFAULT);
+	avg_bits = find_closest(avg, ina226_avg_tab,
+				ARRAY_SIZE(ina226_avg_tab));
+
+	return INA226_SHIFT_AVG(avg_bits);
+}
+
+/*
+ * Calibration register is set to the best value, which eliminates
+ * truncation errors on calculating current register in hardware.
+ * According to datasheet (eq. 3) the best values are 2048 for
+ * ina226 and 4096 for ina219. They are hardcoded as calibration_value.
+ */
+static int ina2xx_calibrate(struct ina2xx_data *data)
+{
+	return regmap_write(data->regmap, INA2XX_CALIBRATION,
+			    data->config->calibration_value);
+}
+
+/*
+ * Initialize the configuration and calibration registers.
+ */
+static int ina2xx_init(struct ina2xx_data *data)
+{
+	int ret = regmap_write(data->regmap, INA2XX_CONFIG,
+			       data->config->config_default);
+	if (ret < 0)
+		return ret;
+
+	return ina2xx_calibrate(data);
+}
+
+static int ina2xx_read_reg(struct device *dev, int reg, unsigned int *regval)
+{
+	struct ina2xx_data *data = dev_get_drvdata(dev);
+	int ret, retry;
+
+	dev_dbg(dev, "Starting register %d read\n", reg);
+
+	for (retry = 5; retry; retry--) {
+
+		ret = regmap_read(data->regmap, reg, regval);
+		if (ret < 0)
+			return ret;
+
+		dev_dbg(dev, "read %d, val = 0x%04x\n", reg, *regval);
+
+		/*
+		 * If the current value in the calibration register is 0, the
+		 * power and current registers will also remain at 0. In case
+		 * the chip has been reset let's check the calibration
+		 * register and reinitialize if needed.
+		 * We do that extra read of the calibration register if there
+		 * is some hint of a chip reset.
+		 */
+		if (*regval == 0) {
+			unsigned int cal;
+
+			ret = regmap_read(data->regmap, INA2XX_CALIBRATION,
+					  &cal);
+			if (ret < 0)
+				return ret;
+
+			if (cal == 0) {
+				dev_warn(dev, "chip not calibrated, reinitializing\n");
+
+				ret = ina2xx_init(data);
+				if (ret < 0)
+					return ret;
+				/*
+				 * Let's make sure the power and current
+				 * registers have been updated before trying
+				 * again.
+				 */
+				msleep(INA2XX_MAX_DELAY);
+				continue;
+			}
+		}
+		return 0;
+	}
+
+	/*
+	 * If we're here then although all write operations succeeded, the
+	 * chip still returns 0 in the calibration register. Nothing more we
+	 * can do here.
+	 */
+	dev_err(dev, "unable to reinitialize the chip\n");
+	return -ENODEV;
+}
+
+static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
+			    unsigned int regval)
+{
+	int val;
+
+	switch (reg) {
+	case INA2XX_SHUNT_VOLTAGE:
+		/* signed register */
+		val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);
+		break;
+	case INA2XX_BUS_VOLTAGE:
+		val = (regval >> data->config->bus_voltage_shift)
+		  * data->config->bus_voltage_lsb;
+		val = DIV_ROUND_CLOSEST(val, 1000);
+		break;
+	case INA2XX_POWER:
+		val = regval * data->power_lsb_uW;
+		break;
+	case INA2XX_CURRENT:
+		/* signed register, result in mA */
+		val = (s16)regval * data->current_lsb_uA;
+		val = DIV_ROUND_CLOSEST(val, 1000);
+		break;
+	case INA2XX_CALIBRATION:
+		val = regval;
+		break;
+	default:
+		/* programmer goofed */
+		WARN_ON_ONCE(1);
+		val = 0;
+		break;
+	}
+
+	return val;
+}
+
+static ssize_t ina2xx_show_value(struct device *dev,
+				 struct device_attribute *da, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+	struct ina2xx_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+
+	int err = ina2xx_read_reg(dev, attr->index, &regval);
+
+	if (err < 0)
+		return err;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n",
+			ina2xx_get_value(data, attr->index, regval));
+}
+
+/*
+ * In order to keep calibration register value fixed, the product
+ * of current_lsb and shunt_resistor should also be fixed and equal
+ * to shunt_voltage_lsb = 1 / shunt_div multiplied by 10^9 in order
+ * to keep the scale.
+ */
+static int ina2xx_set_shunt(struct ina2xx_data *data, long val)
+{
+	unsigned int dividend = DIV_ROUND_CLOSEST(1000000000,
+						  data->config->shunt_div);
+	if (val <= 0 || val > dividend)
+		return -EINVAL;
+
+	mutex_lock(&data->config_lock);
+	data->rshunt = val;
+	data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);
+	data->power_lsb_uW = data->config->power_lsb_factor *
+			     data->current_lsb_uA;
+	mutex_unlock(&data->config_lock);
+
+	return 0;
+}
+
+static ssize_t ina2xx_show_shunt(struct device *dev,
+			      struct device_attribute *da,
+			      char *buf)
+{
+	struct ina2xx_data *data = dev_get_drvdata(dev);
+
+	return snprintf(buf, PAGE_SIZE, "%li\n", data->rshunt);
+}
+
+static ssize_t ina2xx_store_shunt(struct device *dev,
+				  struct device_attribute *da,
+				  const char *buf, size_t count)
+{
+	unsigned long val;
+	int status;
+	struct ina2xx_data *data = dev_get_drvdata(dev);
+
+	status = kstrtoul(buf, 10, &val);
+	if (status < 0)
+		return status;
+
+	status = ina2xx_set_shunt(data, val);
+	if (status < 0)
+		return status;
+	return count;
+}
+
+static ssize_t ina226_set_interval(struct device *dev,
+				   struct device_attribute *da,
+				   const char *buf, size_t count)
+{
+	struct ina2xx_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int status;
+
+	status = kstrtoul(buf, 10, &val);
+	if (status < 0)
+		return status;
+
+	if (val > INT_MAX || val == 0)
+		return -EINVAL;
+
+	status = regmap_update_bits(data->regmap, INA2XX_CONFIG,
+				    INA226_AVG_RD_MASK,
+				    ina226_interval_to_reg(val));
+	if (status < 0)
+		return status;
+
+	return count;
+}
+
+static ssize_t ina226_show_interval(struct device *dev,
+				    struct device_attribute *da, char *buf)
+{
+	struct ina2xx_data *data = dev_get_drvdata(dev);
+	int status;
+	unsigned int regval;
+
+	status = regmap_read(data->regmap, INA2XX_CONFIG, &regval);
+	if (status)
+		return status;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", ina226_reg_to_interval(regval));
+}
+
+/* shunt voltage */
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina2xx_show_value, NULL,
+			  INA2XX_SHUNT_VOLTAGE);
+
+/* bus voltage */
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina2xx_show_value, NULL,
+			  INA2XX_BUS_VOLTAGE);
+
+/* calculated current */
+static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina2xx_show_value, NULL,
+			  INA2XX_CURRENT);
+
+/* calculated power */
+static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL,
+			  INA2XX_POWER);
+
+/* shunt resistance */
+static SENSOR_DEVICE_ATTR(shunt_resistor, S_IRUGO | S_IWUSR,
+			  ina2xx_show_shunt, ina2xx_store_shunt,
+			  INA2XX_CALIBRATION);
+
+/* update interval (ina226 only) */
+static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR,
+			  ina226_show_interval, ina226_set_interval, 0);
+
+/* pointers to created device attributes */
+static struct attribute *ina2xx_attrs[] = {
+	&sensor_dev_attr_in0_input.dev_attr.attr,
+	&sensor_dev_attr_in1_input.dev_attr.attr,
+	&sensor_dev_attr_curr1_input.dev_attr.attr,
+	&sensor_dev_attr_power1_input.dev_attr.attr,
+	&sensor_dev_attr_shunt_resistor.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ina2xx_group = {
+	.attrs = ina2xx_attrs,
+};
+
+static struct attribute *ina226_attrs[] = {
+	&sensor_dev_attr_update_interval.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ina226_group = {
+	.attrs = ina226_attrs,
+};
+
+static int ina2xx_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct ina2xx_data *data;
+	struct device *hwmon_dev;
+	u32 val;
+	int ret, group = 0;
+	enum ina2xx_ids chip;
+
+	if (client->dev.of_node)
+		chip = (enum ina2xx_ids)of_device_get_match_data(&client->dev);
+	else
+		chip = id->driver_data;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	/* set the device type */
+	data->config = &ina2xx_config[chip];
+	mutex_init(&data->config_lock);
+
+	if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
+		struct ina2xx_platform_data *pdata = dev_get_platdata(dev);
+
+		if (pdata)
+			val = pdata->shunt_uohms;
+		else
+			val = INA2XX_RSHUNT_DEFAULT;
+	}
+
+	ina2xx_set_shunt(data, val);
+
+	ina2xx_regmap_config.max_register = data->config->registers;
+
+	data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);
+	if (IS_ERR(data->regmap)) {
+		dev_err(dev, "failed to allocate register map\n");
+		return PTR_ERR(data->regmap);
+	}
+
+	ret = ina2xx_init(data);
+	if (ret < 0) {
+		dev_err(dev, "error configuring the device: %d\n", ret);
+		return -ENODEV;
+	}
+
+	data->groups[group++] = &ina2xx_group;
+	if (chip == ina226)
+		data->groups[group++] = &ina226_group;
+
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+							   data, data->groups);
+	if (IS_ERR(hwmon_dev))
+		return PTR_ERR(hwmon_dev);
+
+	dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
+		 client->name, data->rshunt);
+
+	return 0;
+}
+
+static const struct i2c_device_id ina2xx_id[] = {
+	{ "ina219", ina219 },
+	{ "ina220", ina219 },
+	{ "ina226", ina226 },
+	{ "ina230", ina226 },
+	{ "ina231", ina226 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ina2xx_id);
+
+static const struct of_device_id ina2xx_of_match[] = {
+	{
+		.compatible = "ti,ina219",
+		.data = (void *)ina219
+	},
+	{
+		.compatible = "ti,ina220",
+		.data = (void *)ina219
+	},
+	{
+		.compatible = "ti,ina226",
+		.data = (void *)ina226
+	},
+	{
+		.compatible = "ti,ina230",
+		.data = (void *)ina226
+	},
+	{
+		.compatible = "ti,ina231",
+		.data = (void *)ina226
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ina2xx_of_match);
+
+static struct i2c_driver ina2xx_driver = {
+	.driver = {
+		.name	= "ina2xx",
+		.of_match_table = of_match_ptr(ina2xx_of_match),
+	},
+	.probe		= ina2xx_probe,
+	.id_table	= ina2xx_id,
+};
+
+module_i2c_driver(ina2xx_driver);
+
+MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
+MODULE_DESCRIPTION("ina2xx driver");
+MODULE_LICENSE("GPL");