This patch supports suspend/resume functions for mcs5080 touchkey
driver.
Signed-off-by: Heungjun Kim <riverful.kim@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/input/keyboard/mcs_touchkey.c | 51 +++++++++++++++++++++++++++++++++
include/linux/i2c/mcs.h | 1 +
2 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/drivers/input/keyboard/mcs_touchkey.c b/drivers/input/keyboard/mcs_touchkey.c
index 63b849d..92149e4 100644
--- a/drivers/input/keyboard/mcs_touchkey.c
+++ b/drivers/input/keyboard/mcs_touchkey.c
@@ -19,6 +19,7 @@
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
/* MCS5000 Touchkey */
#define MCS5000_TOUCHKEY_STATUS 0x04
@@ -45,6 +46,8 @@ struct mcs_touchkey_chip {
};
struct mcs_touchkey_data {
+ void (*poweron)(bool);
+
struct i2c_client *client;
struct input_dev *input_dev;
struct mcs_touchkey_chip chip;
@@ -168,6 +171,10 @@ static int __devinit mcs_touchkey_probe(struct i2c_client *client,
if (pdata->cfg_pin)
pdata->cfg_pin();
+ if (pdata->poweron) {
+ data->poweron = pdata->poweron;
+ data->poweron(1);
+ }
error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
IRQF_TRIGGER_FALLING, client->dev.driver->name, data);
@@ -181,6 +188,9 @@ static int __devinit mcs_touchkey_probe(struct i2c_client *client,
goto err_free_irq;
i2c_set_clientdata(client, data);
+
+ pm_runtime_set_active(&client->dev);
+
return 0;
err_free_irq:
@@ -202,6 +212,46 @@ static int __devexit mcs_touchkey_remove(struct i2c_client *client)
return 0;
}
+#ifdef CONFIG_PM
+static int mcs_touchkey_suspend(struct device *dev)
+{
+ struct mcs_touchkey_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+
+ /* Disable the work */
+ disable_irq(client->irq);
+
+ /* Finally turn off the power */
+ if (data->poweron)
+ data->poweron(0);
+
+ return 0;
+}
+
+static int mcs_touchkey_resume(struct device *dev)
+{
+ struct mcs_touchkey_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+
+ /* Enable the device first */
+ if (data->poweron)
+ data->poweron(1);
+
+ /* Enable irq again */
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static const struct dev_pm_ops mcs_touchkey_pm_ops = {
+ .suspend = mcs_touchkey_suspend,
+ .resume = mcs_touchkey_resume,
+};
+#define MCS_TOUCHKEY_PM_OPS (&mcs_touchkey_pm_ops)
+#else
+#define MCS_TOUCHKEY_PM_OPS NULL
+#endif
+
static const struct i2c_device_id mcs_touchkey_id[] = {
{ "mcs5000_touchkey", MCS5000_TOUCHKEY },
{ "mcs5080_touchkey", MCS5080_TOUCHKEY },
@@ -213,6 +263,7 @@ static struct i2c_driver mcs_touchkey_driver = {
.driver = {
.name = "mcs_touchkey",
.owner = THIS_MODULE,
+ .pm = MCS_TOUCHKEY_PM_OPS,
},
.probe = mcs_touchkey_probe,
.remove = __devexit_p(mcs_touchkey_remove),
diff --git a/include/linux/i2c/mcs.h b/include/linux/i2c/mcs.h
index 725ae7c..61bb18a 100644
--- a/include/linux/i2c/mcs.h
+++ b/include/linux/i2c/mcs.h
@@ -18,6 +18,7 @@
#define MCS_KEY_CODE(v) ((v) & 0xffff)
struct mcs_platform_data {
+ void (*poweron)(bool);
void (*cfg_pin)(void);
/* touchscreen */
--
1.7.0.4
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