usb: gadget: udc: renesas_usb3: add extcon support

This patch adds extcon support to see VBUS/ID signal states.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index 4b69f28..66cb00b 100644 (file)
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -191,6 +191,7 @@ config USB_RENESAS_USBHS_UDC
 config USB_RENESAS_USB3
        tristate 'Renesas USB3.0 Peripheral controller'
        depends on ARCH_RENESAS || COMPILE_TEST
+       depends on EXTCON
        help
           Renesas USB3.0 Peripheral controller is a USB peripheral controller
           that supports super, high, and full speed USB 3.0 data transfers.

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 3e96c56..a1e79fc 100644 (file)
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -10,6 +10,7 @@
 
 #include <linux/delay.h>
 #include <linux/err.h>
+#include <linux/extcon.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -263,6 +264,8 @@ struct renesas_usb3 {
 
        struct usb_gadget gadget;
        struct usb_gadget_driver *driver;
+       struct extcon_dev *extcon;
+       struct work_struct extcon_work;
 
        struct renesas_usb3_ep *usb3_ep;
        int num_usb3_eps;
@@ -275,6 +278,8 @@ struct renesas_usb3 {
        u8 ep0_buf[USB3_EP0_BUF_SIZE];
        bool softconnect;
        bool workaround_for_vbus;
+       bool extcon_host;               /* check id and set EXTCON_USB_HOST */
+       bool extcon_usb;                /* check vbus and set EXTCON_USB */
 };
 
 #define gadget_to_renesas_usb3(_gadget)        \
@@ -338,6 +343,15 @@ static int usb3_wait(struct renesas_usb3 *usb3, u32 reg, u32 mask,
        return -EBUSY;
 }
 
+static void renesas_usb3_extcon_work(struct work_struct *work)
+{
+       struct renesas_usb3 *usb3 = container_of(work, struct renesas_usb3,
+                                                extcon_work);
+
+       extcon_set_state_sync(usb3->extcon, EXTCON_USB_HOST, usb3->extcon_host);
+       extcon_set_state_sync(usb3->extcon, EXTCON_USB, usb3->extcon_usb);
+}
+
 static void usb3_enable_irq_1(struct renesas_usb3 *usb3, u32 bits)
 {
        usb3_set_bit(usb3, bits, USB3_USB_INT_ENA_1);
@@ -533,10 +547,14 @@ static void usb3_check_vbus(struct renesas_usb3 *usb3)
        if (usb3->workaround_for_vbus) {
                usb3_connect(usb3);
        } else {
-               if (usb3_read(usb3, USB3_USB_STA) & USB_STA_VBUS_STA)
+               usb3->extcon_usb = !!(usb3_read(usb3, USB3_USB_STA) &
+                                                       USB_STA_VBUS_STA);
+               if (usb3->extcon_usb)
                        usb3_connect(usb3);
                else
                        usb3_disconnect(usb3);
+
+               schedule_work(&usb3->extcon_work);
        }
 }
 
@@ -569,10 +587,14 @@ static bool usb3_is_a_device(struct renesas_usb3 *usb3)
 
 static void usb3_check_id(struct renesas_usb3 *usb3)
 {
-       if (usb3_is_a_device(usb3))
+       usb3->extcon_host = usb3_is_a_device(usb3);
+
+       if (usb3->extcon_host)
                usb3_mode_config(usb3, true, true);
        else
                usb3_mode_config(usb3, false, false);
+
+       schedule_work(&usb3->extcon_work);
 }
 
 static void renesas_usb3_init_controller(struct renesas_usb3 *usb3)
@@ -1953,6 +1975,12 @@ static const struct of_device_id usb3_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, usb3_of_match);
 
+static const unsigned int renesas_usb3_cable[] = {
+       EXTCON_USB,
+       EXTCON_USB_HOST,
+       EXTCON_NONE,
+};
+
 static int renesas_usb3_probe(struct platform_device *pdev)
 {
        struct renesas_usb3 *usb3;
@@ -1996,6 +2024,17 @@ static int renesas_usb3_probe(struct platform_device *pdev)
        if (ret < 0)
                return ret;
 
+       INIT_WORK(&usb3->extcon_work, renesas_usb3_extcon_work);
+       usb3->extcon = devm_extcon_dev_allocate(&pdev->dev, renesas_usb3_cable);
+       if (IS_ERR(usb3->extcon))
+               return PTR_ERR(usb3->extcon);
+
+       ret = devm_extcon_dev_register(&pdev->dev, usb3->extcon);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Failed to register extcon\n");
+               return ret;
+       }
+
        /* for ep0 handling */
        usb3->ep0_req = __renesas_usb3_ep_alloc_request(GFP_KERNEL);
        if (!usb3->ep0_req)