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Commit 48bc1774 authored by Ramakrishna Pallala's avatar Ramakrishna Pallala Committed by Anton Vorontsov
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max17042_battery: Add suspend/resume hooks 



This patch adds suspend/resume methods to the driver.

In suspend method irq line is disabled to avoid i2c
read/write errors from the interrupt handler as the
i2c bus itself could be in suspend state.
In resume function irq line will be re-enabled.

Signed-off-by: default avatarRamakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: default avatarAnton Vorontsov <anton.vorontsov@linaro.org>
parent bb28da90

drivers/power/max17042_battery.c

+41 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/i2c.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/pm.h>

#include <linux/mod_devicetable.h>

#include <linux/power_supply.h>

#include <linux/power/max17042_battery.h>
@@ -721,6 +722,40 @@ static int __devexit max17042_remove(struct i2c_client *client) 
	return 0;

}



#ifdef CONFIG_PM

static int max17042_suspend(struct device *dev)

{

	struct max17042_chip *chip = dev_get_drvdata(dev);



	/* disable the irq and enable irq_wake

	 * capability to the interrupt line.

	 */

	if (chip->client->irq) {

		disable_irq(chip->client->irq);

		enable_irq_wake(chip->client->irq);

	}



	return 0;

}



static int max17042_resume(struct device *dev)

{

	struct max17042_chip *chip = dev_get_drvdata(dev);



	if (chip->client->irq) {

		disable_irq_wake(chip->client->irq);

		enable_irq(chip->client->irq);

		/* re-program the SOC thresholds to 1% change */

		max17042_set_soc_threshold(chip, 1);

	}



	return 0;

}

#else

#define max17042_suspend NULL

#define max17042_resume NULL

#endif



#ifdef CONFIG_OF

static const struct of_device_id max17042_dt_match[] = {

	{ .compatible = "maxim,max17042" },
@@ -735,10 +770,16 @@ static const struct i2c_device_id max17042_id[] = { 
};

MODULE_DEVICE_TABLE(i2c, max17042_id);



static const struct dev_pm_ops max17042_pm_ops = {

	.suspend		= max17042_suspend,

	.resume			= max17042_resume,

};



static struct i2c_driver max17042_i2c_driver = {

	.driver	= {

		.name	= "max17042",

		.of_match_table = of_match_ptr(max17042_dt_match),

		.pm	= &max17042_pm_ops,

	},

	.probe		= max17042_probe,

	.remove		= __devexit_p(max17042_remove),