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USB: pxa27x_udc: add vbus session handling 

On vbus_session() call, optionally activate D+ pullup
resistor and enable the udc, or deactivate D+ pullup
resistor and disable the udc.

It is intentional to not handle any VBus sense related irq.
An external transceiver driver (like gpio_vbus) should
catch VBus sense signal, and call usb_gadget_vbus_connect()
or usb_gadget_vbus_disconnect().

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Robert Jarzmik 2009-01-24 23:56:42 -08:00 committed by Greg Kroah-Hartman
parent eb50702539
commit b799a7eb68
2 changed files with 34 additions and 0 deletions
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33
drivers/usb/gadget/pxa27x_udc.c
View File

@ -1536,8 +1536,10 @@ static void udc_disable(struct pxa_udc *udc);
* Context: any
*
* The UDC should be enabled if :
* - the pullup resistor is connected
* - and a gadget driver is bound
* - and vbus is sensed (or no vbus sense is available)
*
* Returns 1 if UDC should be enabled, 0 otherwise
*/
@ -1546,6 +1548,7 @@ static int should_enable_udc(struct pxa_udc *udc)
int put_on;
put_on = ((udc->pullup_on) && (udc->driver));
put_on &= ((udc->vbus_sensed) || (!udc->transceiver));
return put_on;
}
@ -1557,6 +1560,7 @@ static int should_enable_udc(struct pxa_udc *udc)
* The UDC should be disabled if :
* - the pullup resistor is not connected
* - or no gadget driver is bound
* - or no vbus is sensed (when vbus sesing is available)
*
* Returns 1 if UDC should be disabled
*/
@ -1565,6 +1569,7 @@ static int should_disable_udc(struct pxa_udc *udc)
int put_off;
put_off = ((!udc->pullup_on) || (!udc->driver));
put_off |= ((!udc->vbus_sensed) && (udc->transceiver));
return put_off;
}
@ -1592,10 +1597,37 @@ static int pxa_udc_pullup(struct usb_gadget *_gadget, int is_active)
return 0;
}
static void udc_enable(struct pxa_udc *udc);
static void udc_disable(struct pxa_udc *udc);
/**
* pxa_udc_vbus_session - Called by external transceiver to enable/disable udc
* @_gadget: usb gadget
* @is_active: 0 if should disable the udc, 1 if should enable
*
* Enables the udc, and optionnaly activates D+ pullup resistor. Or disables the
* udc, and deactivates D+ pullup resistor.
*
* Returns 0
*/
static int pxa_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
{
struct pxa_udc *udc = to_gadget_udc(_gadget);
udc->vbus_sensed = is_active;
if (should_enable_udc(udc))
udc_enable(udc);
if (should_disable_udc(udc))
udc_disable(udc);
return 0;
}
static const struct usb_gadget_ops pxa_udc_ops = {
.get_frame = pxa_udc_get_frame,
.wakeup = pxa_udc_wakeup,
.pullup = pxa_udc_pullup,
.vbus_session = pxa_udc_vbus_session,
/* current versions must always be self-powered */
};
@ -2357,6 +2389,7 @@ static int __init pxa_udc_probe(struct platform_device *pdev)
device_initialize(&udc->gadget.dev);
udc->gadget.dev.parent = &pdev->dev;
udc->gadget.dev.dma_mask = NULL;
udc->vbus_sensed = 0;
the_controller = udc;
platform_set_drvdata(pdev, udc);

1
drivers/usb/gadget/pxa27x_udc.h
View File

@ -456,6 +456,7 @@ struct pxa_udc {
unsigned enabled:1;
unsigned pullup_on:1;
unsigned pullup_resume:1;
unsigned vbus_sensed:1;
unsigned config:2;
unsigned last_interface:3;
unsigned last_alternate:3;