USB: pxa27x_udc: add otg transceiver support

When a transceiver driver is used, no automatic udc enable
is done. The transceiver (OTG or not) should :
 - take care of VBus sensing
 - call usb_gadget_vbus_connect()
 - call usb_gadget_vbus_disconnect()

The pullup should remain within this driver's management,
either by gpio_pullup of udc_command() fields.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index 0c9307118b54..11510472ee00 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -1779,10 +1779,21 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
         dev_dbg(udc->dev, "registered gadget driver '%s'\n",
                 driver->driver.name);
 
+        if (udc->transceiver) {
+                retval = otg_set_peripheral(udc->transceiver, &udc->gadget);
+                if (retval) {
+                        dev_err(udc->dev, "can't bind to transceiver\n");
+                        goto transceiver_fail;
+                }
+        }
+
         if (should_enable_udc(udc))
                 udc_enable(udc);
         return 0;
 
+transceiver_fail:
+        if (driver->unbind)
+                driver->unbind(&udc->gadget);
 bind_fail:
         device_del(&udc->gadget.dev);
 add_fail:
@@ -1840,9 +1851,11 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
         udc->driver = NULL;
 
         device_del(&udc->gadget.dev);
-
         dev_info(udc->dev, "unregistered gadget driver '%s'\n",
                  driver->driver.name);
+
+        if (udc->transceiver)
+                return otg_set_peripheral(udc->transceiver, NULL);
         return 0;
 }
 EXPORT_SYMBOL(usb_gadget_unregister_driver);
@@ -2359,6 +2372,7 @@ static int __init pxa_udc_probe(struct platform_device *pdev)
 
         udc->dev = &pdev->dev;
         udc->mach = pdev->dev.platform_data;
+        udc->transceiver = otg_get_transceiver();
 
         gpio = udc->mach->gpio_pullup;
         if (gpio_is_valid(gpio)) {
@@ -2431,6 +2445,9 @@ static int __exit pxa_udc_remove(struct platform_device *_dev)
         if (gpio_is_valid(gpio))
                 gpio_free(gpio);
 
+        otg_put_transceiver(udc->transceiver);
+
+        udc->transceiver = NULL;
         platform_set_drvdata(_dev, NULL);
         the_controller = NULL;
         clk_put(udc->clk);