[PATCH v3 3/7] usb: chipidea: add otg id switch and vbus connect/disconnect detect
Alexander Shishkin
alexander.shishkin at linux.intel.com
Thu Nov 29 09:30:10 EST 2012
Peter Chen <peter.chen at freescale.com> writes:
> +static void ci_otg_work(struct work_struct *work)
> +{
> + struct ci13xxx *ci = container_of(work, struct ci13xxx, work);
> +
> + if (test_bit(CI_ID, &ci->events)) {
> + clear_bit(CI_ID, &ci->events);
> + ci_handle_id_switch(ci);
> + } else if (test_bit(CI_B_SESS_VALID, &ci->events)) {
> + clear_bit(CI_B_SESS_VALID, &ci->events);
> + ci_handle_vbus_change(ci);
> + } else
> + dev_err(ci->dev, "unexpected event occurs at %s\n", __func__);
> +
> + enable_irq(ci->irq);
> +}
if (ci->id) {
ci->id = false;
ci_handle_id_switch(ci);
} else if (ci->vbus_valid) {
ci->vbus_valid = false;
ci_handle_vbus_change(ci);
} ...
is so much easier on the eyes. We really don't have any reasons to have
events in a bitmask.
> +
> +static void ci_delayed_work(struct work_struct *work)
> +{
> + struct delayed_work *dwork = to_delayed_work(work);
> + struct ci13xxx *ci = container_of(dwork, struct ci13xxx, dwork);
> +
> + otg_set_vbus(&ci->otg, true);
> +
> +}
> +
> static ssize_t show_role(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> @@ -321,19 +422,36 @@ static irqreturn_t ci_irq(int irq, void *data)
> irqreturn_t ret = IRQ_NONE;
> u32 otgsc = 0;
>
> - if (ci->is_otg)
> - otgsc = hw_read(ci, OP_OTGSC, ~0);
> -
> - if (ci->role != CI_ROLE_END)
> - ret = ci_role(ci)->irq(ci);
> + otgsc = hw_read(ci, OP_OTGSC, ~0);
>
> - if (ci->is_otg && (otgsc & OTGSC_IDIS)) {
> + /*
> + * Handle id change interrupt, it indicates device/host function
> + * switch.
> + */
> + if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
> + set_bit(CI_ID, &ci->events);
> hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS);
A thought: we're setting and unsetting IDIS/IDIE and BSVIS/BSVIE that we
might use a helper function for it.
> disable_irq_nosync(ci->irq);
> queue_work(ci->wq, &ci->work);
> - ret = IRQ_HANDLED;
> + return IRQ_HANDLED;
> + }
> +
> + /*
> + * Handle vbus change interrupt, it indicates device connection
> + * and disconnection events.
> + */
> + if ((otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
> + set_bit(CI_B_SESS_VALID, &ci->events);
> + hw_write(ci, OP_OTGSC, OTGSC_BSVIS, OTGSC_BSVIS);
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + return IRQ_HANDLED;
> }
>
> + /* Handle device/host interrupt */
> + if (ci->role != CI_ROLE_END)
> + ret = ci_role(ci)->irq(ci);
> +
> return ret;
> }
>
> @@ -397,6 +515,7 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
> struct resource *res;
> void __iomem *base;
> int ret;
> + u32 otgsc;
>
> if (!dev->platform_data) {
> dev_err(dev, "platform data missing\n");
> @@ -421,6 +540,7 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
> return -ENOMEM;
> }
>
> + ci->events = 0;
"ci" has just been kzalloc'ed.
> ci->dev = dev;
> ci->platdata = dev->platform_data;
> if (ci->platdata->phy)
> @@ -442,12 +562,20 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
> - INIT_WORK(&ci->work, ci_role_work);
> + INIT_WORK(&ci->work, ci_otg_work);
> + INIT_DELAYED_WORK(&ci->dwork, ci_delayed_work);
> ci->wq = create_singlethread_workqueue("ci_otg");
> if (!ci->wq) {
> dev_err(dev, "can't create workqueue\n");
> return -ENODEV;
> }
> + /* Disable all interrupts bits */
> + hw_write(ci, OP_USBINTR, 0xffffffff, 0);
> + hw_write(ci, OP_OTGSC, OTGSC_INT_EN_BITS, 0);
> +
> + /* Clear all interrupts status bits*/
> + hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
> + hw_write(ci, OP_OTGSC, OTGSC_INT_STATUS_BITS, OTGSC_INT_STATUS_BITS);
How about moving these to hw_device_init()?
>
> /* initialize role(s) before the interrupt is requested */
> ret = ci_hdrc_host_init(ci);
> @@ -465,6 +593,7 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
> }
>
> if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
> + dev_dbg(dev, "support otg\n");
> ci->is_otg = true;
> /* ID pin needs 1ms debouce time, we delay 2ms for safe */
> mdelay(2);
> @@ -475,13 +604,29 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
> : CI_ROLE_GADGET;
> }
>
> + if (ci->is_otg)
> + /* if otg is supported, create struct usb_otg */
> + ci_hdrc_otg_init(ci);
Can this just go the same block where is_otg is set?
> +
> ret = ci_role_start(ci, ci->role);
> if (ret) {
> - dev_err(dev, "can't start %s role\n", ci_role(ci)->name);
> + dev_err(dev, "can't start %s role, ret=%d\n",
> + ci_role(ci)->name, ret);
This change is not really related to the rest of the patch.
> ret = -ENODEV;
> goto rm_wq;
> }
>
> + otgsc = hw_read(ci, OP_OTGSC, ~0);
> + /*
> + * if it is device mode:
> + * - Enable vbus detect
> + * - If it has already connected to host, notify udc
> + */
> + if (ci->role == CI_ROLE_GADGET) {
> + hw_write(ci, OP_OTGSC, OTGSC_BSVIE, OTGSC_BSVIE);
> + ci_handle_vbus_change(ci);
> + }
This looks like something that belongs to gadget role start, doesn't it?
> +
> platform_set_drvdata(pdev, ci);
> ret = request_irq(ci->irq, ci_irq, IRQF_SHARED, ci->platdata->name,
> ci);
> @@ -492,8 +637,9 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
> if (ret)
> goto rm_attr;
>
> - if (ci->is_otg)
> - hw_write(ci, OP_OTGSC, OTGSC_IDIE, OTGSC_IDIE);
> + /* Handle the situation that usb device at the MicroB to A cable */
> + if (ci->is_otg && !(otgsc & OTGSC_ID))
> + queue_delayed_work(ci->wq, &ci->dwork, msecs_to_jiffies(500));
>
> return ret;
>
> diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
> index 7dea3b3..01ae162 100644
> --- a/drivers/usb/chipidea/otg.c
> +++ b/drivers/usb/chipidea/otg.c
> @@ -55,6 +55,7 @@ int ci_hdrc_otg_init(struct ci13xxx *ci)
> ci->otg.set_host = ci_otg_set_host;
> if (!IS_ERR_OR_NULL(ci->transceiver))
> ci->transceiver->otg = &ci->otg;
> + hw_write(ci, OP_OTGSC, OTGSC_IDIE, OTGSC_IDIE);
>
> return 0;
> }
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index d214448..b52cb10 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -1371,6 +1371,7 @@ static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
> pm_runtime_get_sync(&_gadget->dev);
> hw_device_reset(ci, USBMODE_CM_DC);
> hw_device_state(ci, ci->ep0out->qh.dma);
> + dev_dbg(ci->dev, "Connected to host\n");
> } else {
> hw_device_state(ci, 0);
> if (ci->platdata->notify_event)
> @@ -1378,6 +1379,7 @@ static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
> CI13XXX_CONTROLLER_STOPPED_EVENT);
> _gadget_stop_activity(&ci->gadget);
> pm_runtime_put_sync(&_gadget->dev);
> + dev_dbg(ci->dev, "disconnected from host\n");
> }
> }
>
> --
> 1.7.0.4
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