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authorRamakrishna Pallala <ramakrishna.pallala@intel.com>2012-03-27 00:53:40 +0400
committerAnton Vorontsov <anton.vorontsov@linaro.org>2012-05-05 06:37:37 +0400
commit48bc177441d68c0ba70631beb544c3d695328d56 (patch)
treec0f93f8a53a4bf72482be34536571d48e265c7c0 /drivers/power
parentbb28da90f4f973529f81be01547ebde7bf270042 (diff)
downloadlinux-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.c41
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),