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Subject[PATCH] max17042_battery: add suspend/resume hooks
Date
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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