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Commit 9914518e authored by Shubhrajyoti Datta's avatar Shubhrajyoti Datta Committed by Jean Delvare
Browse files

hwmon: (lm75) Add suspend/resume feature 



There is a shutdown feature at suspend it can be enabled to
reduce current consumption and resume it can be switched off.

Signed-off-by: default avatarShubhrajyoti Datta <shubhrajyoti@ti.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 960f12f4

drivers/hwmon/lm75.c

+39 −0
Original line number Diff line number Diff line
@@ -280,10 +280,49 @@ static int lm75_detect(struct i2c_client *new_client, 
	return 0;

}



#ifdef CONFIG_PM

static int lm75_suspend(struct device *dev)

{

	int status;

	struct i2c_client *client = to_i2c_client(dev);

	status = lm75_read_value(client, LM75_REG_CONF);

	if (status < 0) {

		dev_dbg(&client->dev, "Can't read config? %d\n", status);

		return status;

	}

	status = status | LM75_SHUTDOWN;

	lm75_write_value(client, LM75_REG_CONF, status);

	return 0;

}



static int lm75_resume(struct device *dev)

{

	int status;

	struct i2c_client *client = to_i2c_client(dev);

	status = lm75_read_value(client, LM75_REG_CONF);

	if (status < 0) {

		dev_dbg(&client->dev, "Can't read config? %d\n", status);

		return status;

	}

	status = status & ~LM75_SHUTDOWN;

	lm75_write_value(client, LM75_REG_CONF, status);

	return 0;

}



static const struct dev_pm_ops lm75_dev_pm_ops = {

	.suspend	= lm75_suspend,

	.resume		= lm75_resume,

};

#define LM75_DEV_PM_OPS (&lm75_dev_pm_ops)

#else

#define LM75_DEV_PM_OPS NULL

#endif /* CONFIG_PM */



static struct i2c_driver lm75_driver = {

	.class		= I2C_CLASS_HWMON,

	.driver = {

		.name	= "lm75",

		.pm	= LM75_DEV_PM_OPS,

	},

	.probe		= lm75_probe,

	.remove		= lm75_remove,

drivers/hwmon/lm75.h

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
/* straight from the datasheet */

#define LM75_TEMP_MIN (-55000)

#define LM75_TEMP_MAX 125000

#define LM75_SHUTDOWN 0x01



/* TEMP: 0.001C/bit (-55C to +125C)

   REG: (0.5C/bit, two's complement) << 7 */