Hi,
On Thu, Sep 20, 2012 at 03:08:15PM +0800, Peter Chen wrote:
> On Wed, Sep 12, 2012 at 7:58 PM, Alexander Shishkin
> <alexander.shish...@linux.intel.com> wrote:
> > From: Michael Grzeschik <m.grzesc...@pengutronix.de>
> >
> > Add function to physicaly enable or disable of pullup connection on the
> > USB-D+
> > line. The uvc gaget will fail, if this function is not implemented.
> >
> > Cc: <sta...@vger.kernel.org>
> > Signed-off-by: Michael Grzeschik <m.grzesc...@pengutronix.de>
> > Acked-by: Felipe Balbi <ba...@ti.com>
> > Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
> > Signed-off-by: Alexander Shishkin <alexander.shish...@linux.intel.com>
> > ---
> > drivers/usb/chipidea/udc.c | 21 +++++++++++++++++----
> > 1 file changed, 17 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> > index 7801a3f..32ee870 100644
> > --- a/drivers/usb/chipidea/udc.c
> > +++ b/drivers/usb/chipidea/udc.c
> > @@ -78,8 +78,7 @@ static inline int ep_to_bit(struct ci13xxx *ci, int n)
> > }
> >
> > /**
> > - * hw_device_state: enables/disables interrupts & starts/stops device
> > (execute
> > - * without interruption)
> > + * hw_device_state: enables/disables interrupts (execute without
> > interruption)
> > * @dma: 0 => disable, !0 => enable and set dma engine
> > *
> > * This function returns an error code
> > @@ -91,9 +90,7 @@ static int hw_device_state(struct ci13xxx *ci, u32 dma)
> > /* interrupt, error, port change, reset, sleep/suspend */
> > hw_write(ci, OP_USBINTR, ~0,
> > USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
> > - hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
> > } else {
> > - hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
> > hw_write(ci, OP_USBINTR, ~0, 0);
> > }
>
> Hi Marc, your above change break the function that load gadget before
> plug usb cable.
What do you mean with that? When switching into device role, the
otg can load every gadget-module without having the hardware pluged-in.
> Does your change is because the set/clear usbcmd.rs twice at
> usb_gadget_probe_driver
> /usb_gadget_remove_driver? If it is, do you mind I submit a patch to re-add
> it?
If really needed, i suggest to use the api calls instead:
usb_gadget_{probe,remove}_driver
>
> > return 0;
> > @@ -1420,6 +1417,21 @@ static int ci13xxx_vbus_draw(struct usb_gadget
> > *_gadget, unsigned mA)
> > return -ENOTSUPP;
> > }
> >
> > +/* Change Data+ pullup status
> > + * this func is used by usb_gadget_connect/disconnet
> > + */
> > +static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
> > +{
> > + struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
> > +
> > + if (is_on)
> > + hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
> > + else
> > + hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
> > +
> > + return 0;
> > +}
> > +
> > static int ci13xxx_start(struct usb_gadget *gadget,
> > struct usb_gadget_driver *driver);
> > static int ci13xxx_stop(struct usb_gadget *gadget,
> > @@ -1432,6 +1444,7 @@ static int ci13xxx_stop(struct usb_gadget *gadget,
> > static const struct usb_gadget_ops usb_gadget_ops = {
> > .vbus_session = ci13xxx_vbus_session,
> > .wakeup = ci13xxx_wakeup,
> > + .pullup = ci13xxx_pullup,
> > .vbus_draw = ci13xxx_vbus_draw,
> > .udc_start = ci13xxx_start,
> > .udc_stop = ci13xxx_stop,
> > --
> > 1.7.10.4
> >
> > --
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>
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