USB: pxa2xx_udc understands GPIO based VBUS sensing

This updates the PXA 25x UDC board-independent infrastructure for VBUS sensing
and the D+ pullup.  The original code evolved from rather bizarre support on
Intel's "Lubbock" reference hardware, so that on more sensible hardware it
doesn't work as well as it could/should.

The change is just to teach the UDC driver how to use built-in PXA GPIO pins
directly.  This reduces the amount of board-specfic object code needed, and
enables the use of a VBUS sensing IRQ on boards (like Gumstix) that have one.
With VBUS sensing, the UDC is unclocked until a host is actually connected.

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

2 files changed, 76 insertions, 18 deletions

diff --git a/drivers/usb/gadget/pxa2xx_udc.c b/drivers/usb/gadget/pxa2xx_udc.c
index fff027d30a09..f1adcf8b2023 100644
--- a/drivers/usb/gadget/pxa2xx_udc.c
+++ b/drivers/usb/gadget/pxa2xx_udc.c
@@ -150,6 +150,39 @@ MODULE_PARM_DESC (fifo_mode, "pxa2xx udc fifo mode");
 static void pxa2xx_ep_fifo_flush (struct usb_ep *ep);
 static void nuke (struct pxa2xx_ep *, int status);
 
+/* one GPIO should be used to detect VBUS from the host */
+static int is_vbus_present(void)
+{
+        struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
+
+        if (mach->gpio_vbus)
+                return pxa_gpio_get(mach->gpio_vbus);
+        if (mach->udc_is_connected)
+                return mach->udc_is_connected();
+        return 1;
+}
+
+/* one GPIO should control a D+ pullup, so host sees this device (or not) */
+static void pullup_off(void)
+{
+        struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
+
+        if (mach->gpio_pullup)
+                pxa_gpio_set(mach->gpio_pullup, 0);
+        else if (mach->udc_command)
+                mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
+}
+
+static void pullup_on(void)
+{
+        struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
+
+        if (mach->gpio_pullup)
+                pxa_gpio_set(mach->gpio_pullup, 1);
+        else if (mach->udc_command)
+                mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
+}
+
 static void pio_irq_enable(int bEndpointAddress)
 {
         bEndpointAddress &= 0xf;
@@ -1721,6 +1754,16 @@ lubbock_vbus_irq(int irq, void *_dev, struct pt_regs *r)
 
 #endif
 
+static irqreturn_t
+udc_vbus_irq(int irq, void *_dev, struct pt_regs *r)
+{
+        struct pxa2xx_udc       *dev = _dev;
+        int                     vbus = pxa_gpio_get(dev->mach->gpio_vbus);
+
+        pxa2xx_udc_vbus_session(&dev->gadget, vbus);
+        return IRQ_HANDLED;
+}
+
 
 /*-------------------------------------------------------------------------*/
 
@@ -2438,7 +2481,7 @@ static struct pxa2xx_udc memory = {
 static int __init pxa2xx_udc_probe(struct platform_device *pdev)
 {
         struct pxa2xx_udc *dev = &memory;
-        int retval, out_dma = 1;
+        int retval, out_dma = 1, vbus_irq;
         u32 chiprev;
 
         /* insist on Intel/ARM/XScale */
@@ -2502,6 +2545,16 @@ static int __init pxa2xx_udc_probe(struct platform_device *pdev)
         /* other non-static parts of init */
         dev->dev = &pdev->dev;
         dev->mach = pdev->dev.platform_data;
+        if (dev->mach->gpio_vbus) {
+                vbus_irq = IRQ_GPIO(dev->mach->gpio_vbus & GPIO_MD_MASK_NR);
+                pxa_gpio_mode((dev->mach->gpio_vbus & GPIO_MD_MASK_NR)
+                                | GPIO_IN);
+                set_irq_type(vbus_irq, IRQT_BOTHEDGE);
+        } else
+                vbus_irq = 0;
+        if (dev->mach->gpio_pullup)
+                pxa_gpio_mode((dev->mach->gpio_pullup & GPIO_MD_MASK_NR)
+                                | GPIO_OUT | GPIO_DFLT_LOW);
 
         init_timer(&dev->timer);
         dev->timer.function = udc_watchdog;
@@ -2557,8 +2610,19 @@ lubbock_fail0:
                 HEX_DISPLAY(dev->stats.irqs);
                 LUB_DISC_BLNK_LED &= 0xff;
 #endif
-        }
+        } else
 #endif
+        if (vbus_irq) {
+                retval = request_irq(vbus_irq, udc_vbus_irq,
+                                SA_INTERRUPT | SA_SAMPLE_RANDOM,
+                                driver_name, dev);
+                if (retval != 0) {
+                        printk(KERN_ERR "%s: can't get irq %i, err %d\n",
+                                driver_name, vbus_irq, retval);
+                        free_irq(IRQ_USB, dev);
+                        return -EBUSY;
+                }
+        }
         create_proc_files();
 
         return 0;
@@ -2587,6 +2651,8 @@ static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
                 free_irq(LUBBOCK_USB_IRQ, dev);
         }
 #endif
+        if (dev->mach->gpio_vbus)
+                free_irq(IRQ_GPIO(dev->mach->gpio_vbus), dev);
         platform_set_drvdata(pdev, NULL);
         the_controller = NULL;
         return 0;
diff --git a/drivers/usb/gadget/pxa2xx_udc.h b/drivers/usb/gadget/pxa2xx_udc.h
index 19a883f7d1b8..8e598c8bf4e3 100644
--- a/drivers/usb/gadget/pxa2xx_udc.h
+++ b/drivers/usb/gadget/pxa2xx_udc.h
@@ -177,27 +177,19 @@ struct pxa2xx_udc {
 
 static struct pxa2xx_udc *the_controller;
 
-/* one GPIO should be used to detect VBUS from the host */
-static inline int is_vbus_present(void)
+static inline int pxa_gpio_get(unsigned gpio)
 {
-        if (!the_controller->mach->udc_is_connected)
-                return 1;
-        return the_controller->mach->udc_is_connected();
+        return (GPLR(gpio) & GPIO_bit(gpio)) != 0;
 }
 
-/* one GPIO should control a D+ pullup, so host sees this device (or not) */
-static inline void pullup_off(void)
+static inline void pxa_gpio_set(unsigned gpio, int is_on)
 {
-        if (!the_controller->mach->udc_command)
-                return;
-        the_controller->mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
-}
+        int mask = GPIO_bit(gpio);
 
-static inline void pullup_on(void)
-{
-        if (!the_controller->mach->udc_command)
-                return;
-        the_controller->mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
+        if (is_on)
+                GPSR(gpio) = mask;
+        else
+                GPCR(gpio) = mask;
 }
 
 /*-------------------------------------------------------------------------*/