hwmon: (ltc4151) Make shunt-resistor configurable (30fe976f) · Commits · 戴 / test

drivers/hwmon/ltc4151.c

+20 −2

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/init.h>
		#include <linux/err.h>
		#include <linux/slab.h>
		@@ -52,6 +53,7 @@ struct ltc4151_data {
		struct mutex update_lock;
		bool valid;
		unsigned long last_updated; /* in jiffies */
		unsigned int shunt; /* in micro ohms */

		/* Registers */
		u8 regs[6];
		@@ -111,9 +113,9 @@ static int ltc4151_get_value(struct ltc4151_data *data, u8 reg)
		case LTC4151_SENSE_H:
		/*
		* 20uV resolution. Convert to current as measured with
		* an 1 mOhm sense resistor, in mA.
		* a given sense resistor, in mA.
		*/
		val = val * 20;
		val = val * 20 * 1000 / data->shunt;
		break;
		case LTC4151_VIN_H:
		/* 25 mV per increment */
		@@ -176,6 +178,7 @@ static int ltc4151_probe(struct i2c_client *client,
		struct device *dev = &client->dev;
		struct ltc4151_data *data;
		struct device *hwmon_dev;
		u32 shunt;

		if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;
		@@ -184,6 +187,15 @@ static int ltc4151_probe(struct i2c_client *client,
		if (!data)
		return -ENOMEM;

		if (of_property_read_u32(client->dev.of_node,
		"shunt-resistor-micro-ohms", &shunt))
		shunt = 1000; /* 1 mOhm if not set via DT */

		if (shunt == 0)
		return -EINVAL;

		data->shunt = shunt;

		data->client = client;
		mutex_init(&data->update_lock);

		@@ -199,10 +211,16 @@ static const struct i2c_device_id ltc4151_id[] = {
		};
		MODULE_DEVICE_TABLE(i2c, ltc4151_id);

		static const struct of_device_id ltc4151_match[] = {
		{ .compatible = "lltc,ltc4151" },
		{},
		};

		/* This is the driver that will be inserted */
		static struct i2c_driver ltc4151_driver = {
		.driver = {
		.name = "ltc4151",
		.of_match_table = of_match_ptr(ltc4151_match),
		},
		.probe = ltc4151_probe,
		.id_table = ltc4151_id,

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