On Thu, Mar 12, 2015 at 11:06:28AM -0500, Felipe Balbi wrote:
> On Thu, Mar 12, 2015 at 10:30:23AM +0800, Li Jun wrote:
> > Adds HNP polling timer when transits to host state, the OTG status request
> > will be sent to peripheral after timeout, if host request flag is set, it
> > will
> > switch to peripheral state, otherwise it will repeat HNP polling every 1.5s
> > and
> > maintain the current session.
> >
> > Signed-off-by: Li Jun <[email protected]>
> > ---
> > drivers/usb/common/usb-otg-fsm.c | 93
> > ++++++++++++++++++++++++++++++++++++++
> > include/linux/usb/otg-fsm.h | 14 ++++++
> > 2 files changed, 107 insertions(+)
> >
> > +static void otg_hnp_polling_work(struct work_struct *work)
> > +{
> > + struct otg_fsm *fsm = container_of(work, struct otg_fsm,
> > + hnp_polling_work);
> > + struct usb_device *udev;
> > + u8 host_req_flag;
> > + enum usb_otg_state state = fsm->otg->state;
> > + int retval;
> > +
> > + if (state != OTG_STATE_A_HOST && state != OTG_STATE_B_HOST)
> > + return;
> > +
> > + udev = usb_hub_find_child(fsm->otg->host->root_hub, 1);
> > + if (!udev) {
> > + dev_err(fsm->otg->host->controller,
> > + "no usb dev connected, can't start HNP polling\n");
> > + return;
> > + }
> > +
> > + /* Get host request flag from connected USB device */
> > + retval = usb_control_msg(udev,
> > + usb_rcvctrlpipe(udev, 0),
> > + USB_REQ_GET_STATUS,
> > + USB_DIR_IN | USB_RECIP_DEVICE,
> > + 0,
> > + OTG_STS_SELECTOR,
> > + &host_req_flag,
> > + 1,
> > + USB_CTRL_GET_TIMEOUT);
> > + if (retval != 1) {
> > + dev_err(&udev->dev, "Get one byte OTG status failed\n");
> > + return;
> > + }
> > +
> > + if (host_req_flag == 0) {
> > + /* Continue HNP polling */
> > + mod_timer(&fsm->hnp_polling_timer,
> > + jiffies + msecs_to_jiffies(T_HOST_REQ_POLL));
> > + return;
> > + } else if (host_req_flag != HOST_REQUEST_FLAG) {
> > + dev_err(&udev->dev, "host request flag %d is invalid\n",
> > + host_req_flag);
> > + return;
> > + }
> > +
> > + /* Host request flag is set */
> > + if (state == OTG_STATE_A_HOST) {
> > + /* Set b_hnp_enable */
> > + if (!fsm->otg->host->b_hnp_enable) {
> > + retval = usb_control_msg(udev,
> > + usb_sndctrlpipe(udev, 0),
> > + USB_REQ_SET_FEATURE, 0,
> > + USB_DEVICE_B_HNP_ENABLE,
> > + 0, NULL, 0,
> > + USB_CTRL_SET_TIMEOUT);
> > + if (retval < 0) {
> > + dev_err(&udev->dev,
> > + "can't enable HNP %d\n", retval);
> > + return;
> > + }
> > + fsm->otg->host->b_hnp_enable = 1;
> > + }
> > +
> > + fsm->a_bus_req = 0;
> > + } else if (state == OTG_STATE_B_HOST) {
> > + fsm->b_bus_req = 0;
> > + }
> > +
> > + otg_statemachine(fsm);
>
> why isn't all of this...
>
In all cases go to otg_statemachine(fsm) and then return? If the host request
is not set, there should be no any state transitions for HNP polling.
Li Jun
> > +}
> > +
> > +static void hnp_polling_timer_work(unsigned long arg)
> > +{
> > + struct otg_fsm *fsm = (struct otg_fsm *)arg;
> > +
> > + schedule_work(&fsm->hnp_polling_work);
>
> here ? We would avoid a workstruct
>
I will use schedule_delayed_work to avoid a workstruct for timer.
Li Jun
> > +}
> > +
> > +static void otg_start_hnp_polling(struct otg_fsm *fsm)
> > +{
> > + INIT_WORK(&fsm->hnp_polling_work, otg_hnp_polling_work);
> > + setup_timer(&fsm->hnp_polling_timer, hnp_polling_timer_work,
> > + (unsigned long)fsm);
> > + mod_timer(&fsm->hnp_polling_timer,
> > + jiffies + msecs_to_jiffies(T_HOST_REQ_POLL));
> > +}
> > +
> > /* Called when entering a state */
> > static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
> > {
> > @@ -169,6 +260,7 @@ static int otg_set_state(struct otg_fsm *fsm, enum
> > usb_otg_state new_state)
> > otg_set_protocol(fsm, PROTO_HOST);
> > usb_bus_start_enum(fsm->otg->host,
> > fsm->otg->host->otg_port);
> > + otg_start_hnp_polling(fsm);
> > break;
> > case OTG_STATE_A_IDLE:
> > otg_drv_vbus(fsm, 0);
> > @@ -203,6 +295,7 @@ static int otg_set_state(struct otg_fsm *fsm, enum
> > usb_otg_state new_state)
> > */
> > if (!fsm->a_bus_req || fsm->a_suspend_req_inf)
> > otg_add_timer(fsm, A_WAIT_ENUM);
> > + otg_start_hnp_polling(fsm);
> > break;
> > case OTG_STATE_A_SUSPEND:
> > otg_drv_vbus(fsm, 1);
> > diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
> > index f728f18..2a6ee2e 100644
> > --- a/include/linux/usb/otg-fsm.h
> > +++ b/include/linux/usb/otg-fsm.h
> > @@ -40,6 +40,18 @@
> > #define PROTO_HOST (1)
> > #define PROTO_GADGET (2)
> >
> > +#define OTG_STS_SELECTOR 0xF000 /* OTG status selector, according to
> > + * OTG and EH 2.0 Chapter 6.2.3
> > + * Table:6-4
> > + */
>
> looks like this should be in ch9.h ?
>
ok, I will move OTG_STS_SELECTOR to ch9.h
Li Jun
> --
> balbi
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