usb: dwc_otg: Set extcon state for usb cable as always true

To inform to userspace as enable usb features always, set extcon
state for usb cable as connected permanently. To enable this, add
g-extcon-always-on property on dt.

Note: ported from https://git.tizen.org/cgit/profile/common/platform/kernel/linux-artik7/commit/?h=tizen&id=f7e1e93b230f61d66d6a3bc58d09c53dcd305e21

Change-Id: I16fb629ccec54f0ae46e697b56750c3021f01ccb
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>

diff --git a/drivers/amlogic/usb/dwc_otg/310/dwc_otg_driver.c b/drivers/amlogic/usb/dwc_otg/310/dwc_otg_driver.c
index 263ed2c1938fbd091b7a1e0ddafc68de95f1e981..df2746f82451aac90a91dd59abba149b0fa912a1 100644 (file)
--- a/drivers/amlogic/usb/dwc_otg/310/dwc_otg_driver.c
+++ b/drivers/amlogic/usb/dwc_otg/310/dwc_otg_driver.c
@@ -75,6 +75,7 @@
 #ifdef CONFIG_AMLOGIC_LEGACY_EARLY_SUSPEND
 #include <linux/amlogic/pm.h>
 #endif
+#include <linux/extcon.h>
 
 #define DWC_DRIVER_VERSION     "3.10a 12-MAY-2014"
 #define DWC_DRIVER_DESC                "HS OTG USB Controller driver"
@@ -968,6 +969,9 @@ static int dwc_otg_driver_probe(struct platform_device *pdev)
        struct dwc_otg_driver_module_params *pcore_para;
        static int dcount;
        int controller_type = USB_NORMAL;
+#if IS_ENABLED(CONFIG_EXTCON)
+       bool g_extcon_always_on = false;
+#endif
 
        dev_dbg(&pdev->dev, "dwc_otg_driver_probe(%p)\n", pdev);
 
@@ -1069,6 +1073,11 @@ static int dwc_otg_driver_probe(struct platform_device *pdev)
                                        phy_interface = 2;
                        }
 
+#if IS_ENABLED(CONFIG_EXTCON)
+                       g_extcon_always_on =
+                               of_property_read_bool(of_node, "g-extcon-always-on");
+#endif
+
                        dwc_otg_module_params.host_rx_fifo_size = dwc_otg_module_params.data_fifo_size / 2;
                        DWC_PRINTF("dwc_otg: %s: type: %d speed: %d, ",
                                s_clock_name, port_type, port_speed);
@@ -1099,6 +1108,26 @@ static int dwc_otg_driver_probe(struct platform_device *pdev)
        memset(dwc_otg_device, 0, sizeof(*dwc_otg_device));
        dwc_otg_device->os_dep.reg_offset = 0xFFFFFFFF;
 
+#if IS_ENABLED(CONFIG_EXTCON)
+       if (g_extcon_always_on) {
+               struct extcon_dev *edev;
+               static const unsigned int supported_cable[] = {
+                       EXTCON_USB,
+                       EXTCON_NONE,
+               };
+
+               edev = devm_extcon_dev_allocate(&pdev->dev, supported_cable);
+               if (IS_ERR(edev))
+                       return PTR_ERR(edev);
+
+               retval = devm_extcon_dev_register(&pdev->dev, edev);
+               if (retval)
+                       return retval;
+
+               extcon_set_cable_state_(edev, EXTCON_USB, true);
+       }
+#endif
+
        /*
        * Map the DWC_otg Core memory into virtual address space.
        */