USB: at91_udc uses generic GPIO calls; minor cleanup

Various small at91_udc cleanups:

 - Use generic GPIO calls, not older platform-specific ones
 - Use gpio_request()/gpio_free()
 - Use VERBOSE_DEBUG convention, not older VERBOSE
 - Fix sparse complaint about parameter type (changed to gfp_t)
 - Add missing newline to some rarely-seen debug messages
 - Fix some old cleanup bugs on probe() fault paths

Also add a mechanism whereby rm9200 gpios can drive the D+ pullup
through an inverting transistor, based on a patch from Steve Birtles.
Most UDC drivers supporting a GPIO based pullup should probably have
such an option, but testing it requries such a board in hand!

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Steve Birtles <arm_kernel_development@micromark.net.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 60 insertions, 19 deletions

diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 305db36a3b1c..a83e8b798ec9 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -21,8 +21,7 @@
  * Boston, MA  02111-1307, USA.
  */
 
-#undef  DEBUG
-#undef  VERBOSE
+#undef  VERBOSE_DEBUG
 #undef  PACKET_TRACE
 
 #include <linux/kernel.h>
@@ -46,8 +45,8 @@
 #include <asm/irq.h>
 #include <asm/system.h>
 #include <asm/mach-types.h>
+#include <asm/gpio.h>
 
-#include <asm/arch/gpio.h>
 #include <asm/arch/board.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/at91sam9261_matrix.h>
@@ -580,7 +579,7 @@ static int at91_ep_disable (struct usb_ep * _ep)
  */
 
 static struct usb_request *
-at91_ep_alloc_request(struct usb_ep *_ep, unsigned int gfp_flags)
+at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 {
         struct at91_request *req;
 
@@ -881,6 +880,8 @@ static void clk_off(struct at91_udc *udc)
  */
 static void pullup(struct at91_udc *udc, int is_on)
 {
+        int     active = !udc->board.pullup_active_low;
+
         if (!udc->enabled || !udc->vbus)
                 is_on = 0;
         DBG("%sactive\n", is_on ? "" : "in");
@@ -890,7 +891,7 @@ static void pullup(struct at91_udc *udc, int is_on)
                 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
                 at91_udp_write(udc, AT91_UDP_TXVC, 0);
                 if (cpu_is_at91rm9200())
-                        at91_set_gpio_value(udc->board.pullup_pin, 1);
+                        gpio_set_value(udc->board.pullup_pin, active);
                 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
                         u32     txvc = at91_udp_read(udc, AT91_UDP_TXVC);
 
@@ -908,7 +909,7 @@ static void pullup(struct at91_udc *udc, int is_on)
                 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
                 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
                 if (cpu_is_at91rm9200())
-                        at91_set_gpio_value(udc->board.pullup_pin, 0);
+                        gpio_set_value(udc->board.pullup_pin, !active);
                 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
                         u32     txvc = at91_udp_read(udc, AT91_UDP_TXVC);
 
@@ -1551,7 +1552,7 @@ static irqreturn_t at91_vbus_irq(int irq, void *_udc)
 
         /* vbus needs at least brief debouncing */
         udelay(10);
-        value = at91_get_gpio_value(udc->board.vbus_pin);
+        value = gpio_get_value(udc->board.vbus_pin);
         if (value != udc->vbus)
                 at91_vbus_session(&udc->gadget, value);
 
@@ -1647,12 +1648,12 @@ static int __init at91udc_probe(struct platform_device *pdev)
         }
 
         if (pdev->num_resources != 2) {
-                DBG("invalid num_resources");
+                DBG("invalid num_resources\n");
                 return -ENODEV;
         }
         if ((pdev->resource[0].flags != IORESOURCE_MEM)
                         || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
-                DBG("invalid resource type");
+                DBG("invalid resource type\n");
                 return -ENODEV;
         }
 
@@ -1674,10 +1675,26 @@ static int __init at91udc_probe(struct platform_device *pdev)
         udc->pdev = pdev;
         udc->enabled = 0;
 
+        /* rm9200 needs manual D+ pullup; off by default */
+        if (cpu_is_at91rm9200()) {
+                if (udc->board.pullup_pin <= 0) {
+                        DBG("no D+ pullup?\n");
+                        retval = -ENODEV;
+                        goto fail0;
+                }
+                retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
+                if (retval) {
+                        DBG("D+ pullup is busy\n");
+                        goto fail0;
+                }
+                gpio_direction_output(udc->board.pullup_pin,
+                                udc->board.pullup_active_low);
+        }
+
         udc->udp_baseaddr = ioremap(res->start, res->end - res->start + 1);
         if (!udc->udp_baseaddr) {
-                release_mem_region(res->start, res->end - res->start + 1);
-                return -ENOMEM;
+                retval = -ENOMEM;
+                goto fail0a;
         }
 
         udc_reinit(udc);
@@ -1688,12 +1705,13 @@ static int __init at91udc_probe(struct platform_device *pdev)
         if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
                 DBG("clocks missing\n");
                 retval = -ENODEV;
-                goto fail0;
+                /* NOTE: we "know" here that refcounts on these are NOPs */
+                goto fail0b;
         }
 
         retval = device_register(&udc->gadget.dev);
         if (retval < 0)
-                goto fail0;
+                goto fail0b;
 
         /* don't do anything until we have both gadget driver and VBUS */
         clk_enable(udc->iclk);
@@ -1705,25 +1723,32 @@ static int __init at91udc_probe(struct platform_device *pdev)
 
         /* request UDC and maybe VBUS irqs */
         udc->udp_irq = platform_get_irq(pdev, 0);
-        if (request_irq(udc->udp_irq, at91_udc_irq,
-                        IRQF_DISABLED, driver_name, udc)) {
+        retval = request_irq(udc->udp_irq, at91_udc_irq,
+                        IRQF_DISABLED, driver_name, udc);
+        if (retval < 0) {
                 DBG("request irq %d failed\n", udc->udp_irq);
-                retval = -EBUSY;
                 goto fail1;
         }
         if (udc->board.vbus_pin > 0) {
+                retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
+                if (retval < 0) {
+                        DBG("request vbus pin failed\n");
+                        goto fail2;
+                }
+                gpio_direction_input(udc->board.vbus_pin);
+
                 /*
                  * Get the initial state of VBUS - we cannot expect
                  * a pending interrupt.
                  */
-                udc->vbus = at91_get_gpio_value(udc->board.vbus_pin);
+                udc->vbus = gpio_get_value(udc->board.vbus_pin);
                 if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
                                 IRQF_DISABLED, driver_name, udc)) {
                         DBG("request vbus irq %d failed\n",
                                         udc->board.vbus_pin);
                         free_irq(udc->udp_irq, udc);
                         retval = -EBUSY;
-                        goto fail1;
+                        goto fail3;
                 }
         } else {
                 DBG("no VBUS detection, assuming always-on\n");
@@ -1736,8 +1761,18 @@ static int __init at91udc_probe(struct platform_device *pdev)
         INFO("%s version %s\n", driver_name, DRIVER_VERSION);
         return 0;
 
+fail3:
+        if (udc->board.vbus_pin > 0)
+                gpio_free(udc->board.vbus_pin);
+fail2:
+        free_irq(udc->udp_irq, udc);
 fail1:
         device_unregister(&udc->gadget.dev);
+fail0b:
+        iounmap(udc->udp_baseaddr);
+fail0a:
+        if (cpu_is_at91rm9200())
+                gpio_free(udc->board.pullup_pin);
 fail0:
         release_mem_region(res->start, res->end - res->start + 1);
         DBG("%s probe failed, %d\n", driver_name, retval);
@@ -1758,12 +1793,18 @@ static int __exit at91udc_remove(struct platform_device *pdev)
 
         device_init_wakeup(&pdev->dev, 0);
         remove_debug_file(udc);
-        if (udc->board.vbus_pin > 0)
+        if (udc->board.vbus_pin > 0) {
                 free_irq(udc->board.vbus_pin, udc);
+                gpio_free(udc->board.vbus_pin);
+        }
         free_irq(udc->udp_irq, udc);
         device_unregister(&udc->gadget.dev);
 
         iounmap(udc->udp_baseaddr);
+
+        if (cpu_is_at91rm9200())
+                gpio_free(udc->board.pullup_pin);
+
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         release_mem_region(res->start, res->end - res->start + 1);