[PATCH 2/2] twl: usb: Add the resume() and suspend() methods to twl4030-usb.c (re)

[Minkyu Kang <mk7.kang-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>]

The MPU module can be waked up by the unexpected USB
interrupt(HSUSB_MC_NINT). For instance, if the MUSB is working as
peripheral mode and connected to a host PC, it can never enter the low
power mode due to interrupts from the host PC. This patch added the
feature that a board specific file can determines that TWL4030
supplies the USB power or not in the low power mode. Disabling the USB
power may save the power consumption.

Signed-off-by: Minkyu Kang <mk7.kang-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Kim Kyuwon <chammoru-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/usb/otg/twl4030-usb.c |   25 +++++++++++++++++++++++++
 include/linux/i2c/twl4030.h   |    1 +
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index 416e441..b725be2 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -256,6 +256,7 @@ struct twl4030_usb {
 	u8			linkstat;
 	u8			asleep;
 	bool			irq_enabled;
+	bool			suspend_enabled;
 };
 
 /* internal define on top of container_of */
@@ -618,6 +619,7 @@ static int __init twl4030_usb_probe(struct platform_device *pdev)
 	twl->otg.set_suspend	= twl4030_set_suspend;
 	twl->usb_mode		= pdata->usb_mode;
 	twl->asleep		= 1;
+	twl->suspend_enabled	= pdata->suspend_enabled;
 
 	/* init spinlock for workqueue */
 	spin_lock_init(&twl->lock);
@@ -694,9 +696,32 @@ static int __exit twl4030_usb_remove(struct platform_device *pdev)
 	return 0;
 }
 
+int twl4030_usb_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct twl4030_usb *twl = platform_get_drvdata(pdev);
+
+	if (!twl->suspend_enabled)
+		return 0;
+
+	otg_set_suspend(&twl->otg, 1);
+
+	return 0;
+}
+
+int twl4030_usb_resume(struct platform_device *pdev)
+{
+	struct twl4030_usb *twl = platform_get_drvdata(pdev);
+
+	otg_set_suspend(&twl->otg, 0);
+
+	return 0;
+}
+
 static struct platform_driver twl4030_usb_driver = {
 	.probe		= twl4030_usb_probe,
 	.remove		= __exit_p(twl4030_usb_remove),
+	.suspend	= twl4030_usb_suspend,
+	.resume		= twl4030_usb_resume,
 	.driver		= {
 		.name	= "twl4030_usb",
 		.owner	= THIS_MODULE,
diff --git a/include/linux/i2c/twl4030.h b/include/linux/i2c/twl4030.h
index c89d33b..0b12509 100644
--- a/include/linux/i2c/twl4030.h
+++ b/include/linux/i2c/twl4030.h
@@ -325,6 +325,7 @@ enum twl4030_usb_mode {
 
 struct twl4030_usb_data {
 	enum twl4030_usb_mode	usb_mode;
+	bool suspend_enabled;
 };
 
 struct twl4030_ins {
--
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