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usb: chipidea: otg: gadget module load and unload support

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This patch is to support load and unload gadget driver in full OTG mode.

Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Tested-by: Jiada Wang <jiada_wang@mentor.com>
Cc: <stable@vger.kernel.org> #v4.0+
This commit is contained in:
Li Jun 2014-12-12 09:11:42 +08:00 committed by Peter Chen
parent 251b3c8b57
commit 85da852df6
1 changed files with 17 additions and 0 deletions
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17
drivers/usb/chipidea/udc.c
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@ -1751,6 +1751,22 @@ static int ci_udc_start(struct usb_gadget *gadget,
return retval;
}
static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
{
if (!ci_otg_is_fsm_mode(ci))
return;
mutex_lock(&ci->fsm.lock);
if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
ci->fsm.a_bidl_adis_tmout = 1;
ci_hdrc_otg_fsm_start(ci);
} else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
ci->fsm.protocol = PROTO_UNDEF;
ci->fsm.otg->state = OTG_STATE_UNDEFINED;
}
mutex_unlock(&ci->fsm.lock);
}
/**
* ci_udc_stop: unregister a gadget driver
*/
@ -1775,6 +1791,7 @@ static int ci_udc_stop(struct usb_gadget *gadget)
ci->driver = NULL;
spin_unlock_irqrestore(&ci->lock, flags);
ci_udc_stop_for_otg_fsm(ci);
return 0;
}