s3c-hsudc: Add basic otg transceiver handling

Makes it possible to use i.e. gpio-vbus to handle vbus events.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/usb/gadget/s3c-hsudc.c b/drivers/usb/gadget/s3c-hsudc.c
index 00056c27a1c8..3e96cc5bb77f 100644
--- a/drivers/usb/gadget/s3c-hsudc.c
+++ b/drivers/usb/gadget/s3c-hsudc.c
@@ -26,6 +26,7 @@
 #include <linux/clk.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
 #include <linux/prefetch.h>
 
 #include <mach/regs-s3c2443-clock.h>
@@ -137,6 +138,7 @@ struct s3c_hsudc {
         struct usb_gadget_driver *driver;
         struct device *dev;
         struct s3c24xx_hsudc_platdata *pd;
+        struct otg_transceiver *transceiver;
         spinlock_t lock;
         void __iomem *regs;
         struct resource *mem_rsrc;
@@ -1171,6 +1173,22 @@ static int s3c_hsudc_start(struct usb_gadget_driver *driver,
                 return ret;
         }
 
+        /* connect to bus through transceiver */
+        if (hsudc->transceiver) {
+                ret = otg_set_peripheral(hsudc->transceiver, &hsudc->gadget);
+                if (ret) {
+                        dev_err(hsudc->dev, "%s: can't bind to transceiver\n",
+                                        hsudc->gadget.name);
+                        driver->unbind(&hsudc->gadget);
+
+                        device_del(&hsudc->gadget.dev);
+
+                        hsudc->driver = NULL;
+                        hsudc->gadget.dev.driver = NULL;
+                        return ret;
+                }
+        }
+
         enable_irq(hsudc->irq);
         dev_info(hsudc->dev, "bound driver %s\n", driver->driver.name);
 
@@ -1201,6 +1219,9 @@ static int s3c_hsudc_stop(struct usb_gadget_driver *driver)
         s3c_hsudc_stop_activity(hsudc, driver);
         spin_unlock_irqrestore(&hsudc->lock, flags);
 
+        if (hsudc->transceiver)
+                (void) otg_set_peripheral(hsudc->transceiver, NULL);
+
         driver->unbind(&hsudc->gadget);
         device_del(&hsudc->gadget.dev);
         disable_irq(hsudc->irq);
@@ -1247,6 +1268,8 @@ static int s3c_hsudc_probe(struct platform_device *pdev)
         hsudc->dev = dev;
         hsudc->pd = pdev->dev.platform_data;
 
+        hsudc->transceiver = otg_get_transceiver();
+
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!res) {
                 dev_err(dev, "unable to obtain driver resource data\n");