diff options
| author | Ramakrishna Pallala <ramakrishna.pallala@intel.com> | 2012-03-27 00:53:40 +0400 |
|---|---|---|
| committer | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-05-05 06:37:37 +0400 |
| commit | 48bc177441d68c0ba70631beb544c3d695328d56 (patch) | |
| tree | c0f93f8a53a4bf72482be34536571d48e265c7c0 /drivers/power | |
| parent | bb28da90f4f973529f81be01547ebde7bf270042 (diff) | |
| download | linux-48bc177441d68c0ba70631beb544c3d695328d56.tar.xz | |
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>
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/max17042_battery.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c index 93fd13c9be68..07dee974a70e 100644 --- a/drivers/power/max17042_battery.c +++ b/drivers/power/max17042_battery.c @@ -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), |