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: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
This commit is contained in:
Ramakrishna Pallala 2012-03-27 02:23:40 +05:30 коммит произвёл Anton Vorontsov
Родитель bb28da90f4
Коммит 48bc177441
1 изменённых файлов: 41 добавлений и 0 удалений

Просмотреть файл

@ -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),