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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>
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2 changed files with 9 additions and 2 deletions
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@ -127,8 +127,10 @@ static int is_vbus_present(void)
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{
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struct pxa2xx_udc_mach_info *mach = the_controller->mach;
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if (mach->gpio_vbus)
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return gpio_get_value(mach->gpio_vbus);
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if (mach->gpio_vbus) {
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int value = gpio_get_value(mach->gpio_vbus);
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return mach->gpio_vbus_inverted ? !value : value;
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}
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if (mach->udc_is_connected)
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return mach->udc_is_connected();
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return 1;
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@ -1398,6 +1400,9 @@ static irqreturn_t udc_vbus_irq(int irq, void *_dev)
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struct pxa2xx_udc *dev = _dev;
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int vbus = gpio_get_value(dev->mach->gpio_vbus);
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if (dev->mach->gpio_vbus_inverted)
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vbus = !vbus;
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pxa2xx_udc_vbus_session(&dev->gadget, vbus);
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return IRQ_HANDLED;
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}
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@ -19,7 +19,9 @@ struct pxa2xx_udc_mach_info {
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* with on-chip GPIOs not Lubbock's wierd hardware, can have a sane
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* VBUS IRQ and omit the methods above. Store the GPIO number
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* here; for GPIO 0, also mask in one of the pxa_gpio_mode() bits.
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* Note that sometimes the signals go through inverters...
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*/
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bool gpio_vbus_inverted;
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u16 gpio_vbus; /* high == vbus present */
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u16 gpio_pullup; /* high == pullup activated */
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};
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