Messages in this thread Patch in this message | | | From | Ramakrishna Pallala <> | Subject | [PATCH] max17042_battery: add suspend/resume hooks | Date | Tue, 27 Mar 2012 02:23:40 +0530 |
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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> --- 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 d4868c5..cf5c855 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> @@ -728,6 +729,40 @@ 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" }, @@ -742,10 +777,16 @@ 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), -- 1.7.0.4
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