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Subject[PATCH 1/2] USB: s3c2410_udc: Add common implementation for GPIO controlled pullups
Date
Currently all boards using the s3c2410_udc driver use a GPIO to control the
state of the pullup, as a result the same code is reimplemented in each board
file.
This patch adds support for using a GPIO to control the pullup state to the udc
driver, so the boards can use a common implementation.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
arch/arm/plat-s3c24xx/include/plat/udc.h | 4 ++
drivers/usb/gadget/s3c2410_udc.c | 60 +++++++++++++++++++++++++----
2 files changed, 55 insertions(+), 9 deletions(-)
diff --git a/arch/arm/plat-s3c24xx/include/plat/udc.h b/arch/arm/plat-s3c24xx/include/plat/udc.h
index 546bb40..80457c6 100644
--- a/arch/arm/plat-s3c24xx/include/plat/udc.h
+++ b/arch/arm/plat-s3c24xx/include/plat/udc.h
@@ -27,6 +27,10 @@ enum s3c2410_udc_cmd_e {
struct s3c2410_udc_mach_info {
void (*udc_command)(enum s3c2410_udc_cmd_e);
void (*vbus_draw)(unsigned int ma);
+
+ unsigned int pullup_pin;
+ unsigned int pullup_pin_inverted;
+
unsigned int vbus_pin;
unsigned char vbus_pin_inverted;
};
diff --git a/drivers/usb/gadget/s3c2410_udc.c b/drivers/usb/gadget/s3c2410_udc.c
index 2b02520..6d8b040 100644
--- a/drivers/usb/gadget/s3c2410_udc.c
+++ b/drivers/usb/gadget/s3c2410_udc.c
@@ -1481,7 +1481,9 @@ static int s3c2410_udc_set_pullup(struct s3c2410_udc *udc, int is_on)
{
dprintk(DEBUG_NORMAL, "%s()\n", __func__);

- if (udc_info && udc_info->udc_command) {
+ if (udc_info && (udc_info->udc_command ||
+ gpio_is_valid(udc_info->pullup_pin))) {
+
if (is_on)
s3c2410_udc_enable(udc);
else {
@@ -1558,6 +1560,32 @@ static const struct usb_gadget_ops s3c2410_ops = {
.vbus_draw = s3c2410_vbus_draw,
};

+static void s3c2410_udc_command(enum s3c2410_udc_cmd_e cmd)
+{
+ if (!udc_info)
+ return;
+
+ if (udc_info->udc_command) {
+ udc_info->udc_command(S3C2410_UDC_P_DISABLE);
+ } else if (gpio_is_valid(udc_info->pullup_pin)) {
+ int value;
+
+ switch (cmd) {
+ case S3C2410_UDC_P_ENABLE:
+ value = 1;
+ break;
+ case S3C2410_UDC_P_DISABLE:
+ value = 0;
+ break;
+ default:
+ return;
+ }
+ value ^= udc_info->pullup_pin_inverted;
+
+ gpio_set_value(udc_info->pullup_pin, value);
+ }
+}
+
/*------------------------- gadget driver handling---------------------------*/
/*
* s3c2410_udc_disable
@@ -1579,8 +1607,7 @@ static void s3c2410_udc_disable(struct s3c2410_udc *dev)
udc_write(0x1F, S3C2410_UDC_EP_INT_REG);

/* Good bye, cruel world */
- if (udc_info && udc_info->udc_command)
- udc_info->udc_command(S3C2410_UDC_P_DISABLE);
+ s3c2410_udc_command(S3C2410_UDC_P_DISABLE);

/* Set speed to unknown */
dev->gadget.speed = USB_SPEED_UNKNOWN;
@@ -1641,8 +1668,7 @@ static void s3c2410_udc_enable(struct s3c2410_udc *dev)
udc_write(S3C2410_UDC_INT_EP0, S3C2410_UDC_EP_INT_EN_REG);

/* time to say "hello, world" */
- if (udc_info && udc_info->udc_command)
- udc_info->udc_command(S3C2410_UDC_P_ENABLE);
+ s3c2410_udc_command(S3C2410_UDC_P_ENABLE);
}

/*
@@ -1917,6 +1943,17 @@ static int s3c2410_udc_probe(struct platform_device *pdev)
udc->vbus = 1;
}

+ if (udc_info && !udc_info->udc_command &&
+ gpio_is_valid(udc_info->pullup_pin)) {
+
+ retval = gpio_request_one(udc_info->pullup_pin,
+ udc_info->vbus_pin_inverted ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ "udc pullup");
+ if (retval)
+ goto err_vbus_irq;
+ }
+
if (s3c2410_udc_debugfs_root) {
udc->regs_info = debugfs_create_file("registers", S_IRUGO,
s3c2410_udc_debugfs_root,
@@ -1929,6 +1966,9 @@ static int s3c2410_udc_probe(struct platform_device *pdev)

return 0;

+err_vbus_irq:
+ if (udc_info && udc_info->vbus_pin > 0)
+ free_irq(gpio_to_irq(udc_info->vbus_pin), udc);
err_gpio_claim:
if (udc_info && udc_info->vbus_pin > 0)
gpio_free(udc_info->vbus_pin);
@@ -1956,6 +1996,10 @@ static int s3c2410_udc_remove(struct platform_device *pdev)

debugfs_remove(udc->regs_info);

+ if (udc_info && !udc_info->udc_command &&
+ gpio_is_valid(udc_info->pullup_pin))
+ gpio_free(udc_info->pullup_pin);
+
if (udc_info && udc_info->vbus_pin > 0) {
irq = gpio_to_irq(udc_info->vbus_pin);
free_irq(irq, udc);
@@ -1987,16 +2031,14 @@ static int s3c2410_udc_remove(struct platform_device *pdev)
#ifdef CONFIG_PM
static int s3c2410_udc_suspend(struct platform_device *pdev, pm_message_t message)
{
- if (udc_info && udc_info->udc_command)
- udc_info->udc_command(S3C2410_UDC_P_DISABLE);
+ s3c2410_udc_command(S3C2410_UDC_P_DISABLE);

return 0;
}

static int s3c2410_udc_resume(struct platform_device *pdev)
{
- if (udc_info && udc_info->udc_command)
- udc_info->udc_command(S3C2410_UDC_P_ENABLE);
+ s3c2410_udc_command(S3C2410_UDC_P_ENABLE);

return 0;
}
--
1.7.2.3


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