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Subject[PATCH 2/3] usb: usb3503: add PM functions
Date
The usb3503 needs to switch to standby mode while suspending and should
switch to hub mode when resumed. Also we can control clock on PM
function.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
---
drivers/usb/misc/usb3503.c | 34 ++++++++++++++++++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
index 652855b..47cb143 100644
--- a/drivers/usb/misc/usb3503.c
+++ b/drivers/usb/misc/usb3503.c
@@ -149,8 +149,6 @@ static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)

case USB3503_MODE_STANDBY:
usb3503_reset(hub, 0);
-
- hub->mode = mode;
dev_info(dev, "switched to STANDBY mode\n");
break;

@@ -347,6 +345,37 @@ static int usb3503_platform_probe(struct platform_device *pdev)
return usb3503_probe(hub);
}

+#ifdef CONFIG_PM_SLEEP
+static int usb3503_i2c_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct usb3503 *hub = i2c_get_clientdata(client);
+
+ usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
+
+ if (hub->clk)
+ clk_disable_unprepare(hub->clk);
+
+ return 0;
+}
+
+static int usb3503_i2c_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct usb3503 *hub = i2c_get_clientdata(client);
+
+ if (hub->clk)
+ clk_prepare_enable(hub->clk);
+
+ usb3503_switch_mode(hub, hub->mode);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
+ usb3503_i2c_resume);
+
static const struct i2c_device_id usb3503_id[] = {
{ USB3503_I2C_NAME, 0 },
{ }
@@ -365,6 +394,7 @@ MODULE_DEVICE_TABLE(of, usb3503_of_match);
static struct i2c_driver usb3503_i2c_driver = {
.driver = {
.name = USB3503_I2C_NAME,
+ .pm = &usb3503_i2c_pm_ops,
.of_match_table = of_match_ptr(usb3503_of_match),
},
.probe = usb3503_i2c_probe,
--
1.8.1.2


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