From: David Brownell <dbrownell@users.sourceforge.net>
Date: Thu, 27 Dec 2007 19:19:49 +0000 (-0800)
Subject: USB: ohci-at91 uses generic GPIO calls
X-Git-Tag: v2.6.25-rc1~1075^2~40
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4bde4a4c4ff53e67cde4b0fe630d6fc28106bff8;p=linux-2.6

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>
---

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index d849c809ac..126fcbdd64 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);
 }