USB: ohci-at91 uses generic GPIO calls

Update the ohci-at91 bus glue to start understanding about the per-port
power switch GPIOs it's given (on the sam9263-ek and potentially other
boards).  For the moment this just claims them and forces them active
(assuming active-low power enables) whenever the HCD is loaded.

The assumption is still that board setup configures the GPIOs.  Using
gpio_request() tracks actual usage and guards against conflict.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index d849c809acbd..126fcbdd6408 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -17,6 +17,8 @@
 
 #include <asm/mach-types.h>
 #include <asm/hardware.h>
+#include <asm/gpio.h>
+
 #include <asm/arch/board.h>
 #include <asm/arch/cpu.h>
 
@@ -271,12 +273,41 @@ static const struct hc_driver ohci_at91_hc_driver = {
 
 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 {
+        struct at91_usbh_data   *pdata = pdev->dev.platform_data;
+        int                     i;
+
+        if (pdata) {
+                /* REVISIT make the driver support per-port power switching,
+                 * and also overcurrent detection.  Here we assume the ports
+                 * are always powered while this driver is active, and use
+                 * active-low power switches.
+                 */
+                for (i = 0; i < pdata->ports; i++) {
+                        if (pdata->vbus_pin[i] <= 0)
+                                continue;
+                        gpio_request(pdata->vbus_pin[i], "ohci_vbus");
+                        gpio_direction_output(pdata->vbus_pin[i], 0);
+                }
+        }
+
         device_init_wakeup(&pdev->dev, 1);
         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 }
 
 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 {
+        struct at91_usbh_data   *pdata = pdev->dev.platform_data;
+        int                     i;
+
+        if (pdata) {
+                for (i = 0; i < pdata->ports; i++) {
+                        if (pdata->vbus_pin[i] <= 0)
+                                continue;
+                        gpio_direction_output(pdata->vbus_pin[i], 1);
+                        gpio_free(pdata->vbus_pin[i]);
+                }
+        }
+
         device_init_wakeup(&pdev->dev, 0);
         return usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 }