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USB: gadget: pxa2xx_udc supports inverted vbus 

Some boards (like e.g. Tosa) invert the VBUS-detection signal:
it's low when a host is supplying VBUS, and high otherwise.
Allow specifying whether gpio_vbus value is inverted.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dmitry Baryshkov 2007-12-06 18:18:03 -08:00 committed by Greg Kroah-Hartman
parent 26e109b0a9
commit d4a8d46d91
2 changed files with 9 additions and 2 deletions
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9
drivers/usb/gadget/pxa2xx_udc.c
View File

@ -127,8 +127,10 @@ static int is_vbus_present(void)
{
struct pxa2xx_udc_mach_info *mach = the_controller->mach;
if (mach->gpio_vbus)
return gpio_get_value(mach->gpio_vbus);
if (mach->gpio_vbus) {
int value = gpio_get_value(mach->gpio_vbus);
return mach->gpio_vbus_inverted ? !value : value;
}
if (mach->udc_is_connected)
return mach->udc_is_connected();
return 1;
@ -1398,6 +1400,9 @@ static irqreturn_t udc_vbus_irq(int irq, void *_dev)
struct pxa2xx_udc *dev = _dev;
int vbus = gpio_get_value(dev->mach->gpio_vbus);
if (dev->mach->gpio_vbus_inverted)
vbus = !vbus;
pxa2xx_udc_vbus_session(&dev->gadget, vbus);
return IRQ_HANDLED;
}

2
include/asm-arm/mach/udc_pxa2xx.h
View File

@ -19,7 +19,9 @@ struct pxa2xx_udc_mach_info {
* with on-chip GPIOs not Lubbock's wierd hardware, can have a sane
* VBUS IRQ and omit the methods above. Store the GPIO number
* here; for GPIO 0, also mask in one of the pxa_gpio_mode() bits.
* Note that sometimes the signals go through inverters...
*/
bool gpio_vbus_inverted;
u16 gpio_vbus; /* high == vbus present */
u16 gpio_pullup; /* high == pullup activated */
};