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USB: s3c2410 gadget: ensure vbus pin in input mode during read

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Some CPUs in the S3C24XX series do not support readback of the
value of a pin when the pin has been configured to an IRQ.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ben Dooks 2007-11-19 22:28:15 +00:00 committed by Greg Kroah-Hartman
parent 8802bca4fe
commit 5f629ad7e5
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/gadget/s3c2410_udc.c
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@ -1511,7 +1511,11 @@ static irqreturn_t s3c2410_udc_vbus_irq(int irq, void *_dev)
unsigned int value;
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
/* some cpus cannot read from an line configured to IRQ! */
s3c2410_gpio_cfgpin(udc_info->vbus_pin, S3C2410_GPIO_INPUT);
value = s3c2410_gpio_getpin(udc_info->vbus_pin);
s3c2410_gpio_cfgpin(udc_info->vbus_pin, S3C2410_GPIO_SFN2);
if (udc_info->vbus_pin_inverted)
value = !value;