Date:	Tue, 19 Apr 2016 16:06:49 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	stern@...land.harvard.edu, balbi@...nel.org,
	gregkh@...uxfoundation.org, peter.chen@...escale.com,
	dan.j.williams@...el.com, jun.li@...escale.com,
	mathias.nyman@...ux.intel.com, tony@...mide.com,
	Joao.Pinto@...opsys.com, abrestic@...omium.org,
	r.baldyga@...sung.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH v6 07/12] usb: otg: add OTG/dual-role core

On Tue, Apr 05, 2016 at 05:05:12PM +0300, Roger Quadros wrote:
> +/**
> + * usb_otg_start_host - start/stop the host controller
> + * @otg:	usb_otg instance
> + * @on:		true to start, false to stop
> + *
> + * Start/stop the USB host controller. This function is meant
> + * for use by the OTG controller driver.
> + */
> +int usb_otg_start_host(struct usb_otg *otg, int on)
> +{
> +	struct otg_hcd_ops *hcd_ops = otg->hcd_ops;
> +
> +	dev_dbg(otg->dev, "otg: %s %d\n", __func__, on);
> +	if (!otg->host) {
> +		WARN_ONCE(1, "otg: fsm running without host\n");
> +		return 0;
> +	}
> +
> +	if (on) {
> +		if (otg->flags & OTG_FLAG_HOST_RUNNING)
> +			return 0;
> +
> +		otg->flags |= OTG_FLAG_HOST_RUNNING;
> +
> +		/* start host */
> +		hcd_ops->add(otg->primary_hcd.hcd, otg->primary_hcd.irqnum,
> +			     otg->primary_hcd.irqflags);
> +		if (otg->shared_hcd.hcd) {
> +			hcd_ops->add(otg->shared_hcd.hcd,
> +				     otg->shared_hcd.irqnum,
> +				     otg->shared_hcd.irqflags);
> +		}

Check the return value please.

> +	} else {
> +		if (!(otg->flags & OTG_FLAG_HOST_RUNNING))
> +			return 0;
> +
> +		otg->flags &= ~OTG_FLAG_HOST_RUNNING;
> +
> +		/* stop host */
> +		if (otg->shared_hcd.hcd)
> +			hcd_ops->remove(otg->shared_hcd.hcd);
> +
> +		hcd_ops->remove(otg->primary_hcd.hcd);
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_start_host);
> +
> +/**
> + * usb_otg_start_gadget - start/stop the gadget controller
> + * @otg:	usb_otg instance
> + * @on:		true to start, false to stop
> + *
> + * Start/stop the USB gadget controller. This function is meant
> + * for use by the OTG controller driver.
> + */
> +int usb_otg_start_gadget(struct usb_otg *otg, int on)
> +{
> +	struct usb_gadget *gadget = otg->gadget;
> +
> +	dev_dbg(otg->dev, "otg: %s %d\n", __func__, on);
> +	if (!gadget) {
> +		WARN_ONCE(1, "otg: fsm running without gadget\n");
> +		return 0;
> +	}
> +
> +	if (on) {
> +		if (otg->flags & OTG_FLAG_GADGET_RUNNING)
> +			return 0;
> +
> +		otg->flags |= OTG_FLAG_GADGET_RUNNING;
> +		otg->gadget_ops->start(otg->gadget);

ditto

> +	} else {
> +		if (!(otg->flags & OTG_FLAG_GADGET_RUNNING))
> +			return 0;
> +
> +		otg->flags &= ~OTG_FLAG_GADGET_RUNNING;
> +		otg->gadget_ops->stop(otg->gadget);
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_start_gadget);
> +
> +/**
> + * Change USB protocol when there is a protocol change.
> + * fsm->lock must be held.
> + */
> +static int drd_set_protocol(struct otg_fsm *fsm, int protocol)
> +{
> +	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
> +	int ret = 0;
> +
> +	if (fsm->protocol != protocol) {
> +		dev_dbg(otg->dev, "otg: changing role fsm->protocol= %d; new protocol= %d\n",
> +			fsm->protocol, protocol);
> +		/* stop old protocol */
> +		if (fsm->protocol == PROTO_HOST)
> +			ret = otg_start_host(otg, 0);
> +		else if (fsm->protocol == PROTO_GADGET)
> +			ret = otg_start_gadget(otg, 0);
> +		if (ret)
> +			return ret;
> +
> +		/* start new protocol */
> +		if (protocol == PROTO_HOST)
> +			ret = otg_start_host(otg, 1);
> +		else if (protocol == PROTO_GADGET)
> +			ret = otg_start_gadget(otg, 1);
> +		if (ret)
> +			return ret;
> +
> +		fsm->protocol = protocol;
> +		return 0;
> +	}
> +
> +	return 0;
> +}
> +
> +/**
> + * Called when entering a DRD state.
> + * fsm->lock must be held.
> + */
> +static void drd_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
> +{
> +	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
> +
> +	if (otg->state == new_state)
> +		return;
> +
> +	fsm->state_changed = 1;
> +	dev_dbg(otg->dev, "otg: set state: %s\n",
> +		usb_otg_state_string(new_state));
> +	switch (new_state) {
> +	case OTG_STATE_B_IDLE:
> +		drd_set_protocol(fsm, PROTO_UNDEF);
> +		otg_drv_vbus(otg, 0);
> +		break;
> +	case OTG_STATE_B_PERIPHERAL:
> +		drd_set_protocol(fsm, PROTO_GADGET);
> +		otg_drv_vbus(otg, 0);
> +		break;
> +	case OTG_STATE_A_HOST:
> +		drd_set_protocol(fsm, PROTO_HOST);
> +		otg_drv_vbus(otg, 1);
> +		break;
> +	case OTG_STATE_UNDEFINED:
> +	case OTG_STATE_B_SRP_INIT:
> +	case OTG_STATE_B_WAIT_ACON:
> +	case OTG_STATE_B_HOST:
> +	case OTG_STATE_A_IDLE:
> +	case OTG_STATE_A_WAIT_VRISE:
> +	case OTG_STATE_A_WAIT_BCON:
> +	case OTG_STATE_A_SUSPEND:
> +	case OTG_STATE_A_PERIPHERAL:
> +	case OTG_STATE_A_WAIT_VFALL:
> +	case OTG_STATE_A_VBUS_ERR:
> +	default:
> +		dev_warn(otg->dev, "%s: otg: invalid state: %s\n",
> +			 __func__, usb_otg_state_string(new_state));
> +		break;
> +	}
> +
> +	otg->state = new_state;
> +}
> +
> +/**
> + * DRD state change judgement
> + *
> + * For DRD we're only interested in some of the OTG states
> + * i.e. OTG_STATE_B_IDLE: both peripheral and host are stopped
> + *	OTG_STATE_B_PERIPHERAL: peripheral active
> + *	OTG_STATE_A_HOST: host active
> + * we're only interested in the following inputs
> + *	fsm->id, fsm->b_sess_vld
> + */
> +int drd_statemachine(struct usb_otg *otg)
> +{
> +	struct otg_fsm *fsm = &otg->fsm;
> +	enum usb_otg_state state;
> +	int ret;
> +
> +	mutex_lock(&fsm->lock);
> +
> +	fsm->state_changed = 0;
> +	state = otg->state;
> +
> +	switch (state) {
> +	case OTG_STATE_UNDEFINED:
> +		if (!fsm->id)
> +			drd_set_state(fsm, OTG_STATE_A_HOST);
> +		else if (fsm->id && fsm->b_sess_vld)
> +			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
> +		else
> +			drd_set_state(fsm, OTG_STATE_B_IDLE);
> +		break;
> +	case OTG_STATE_B_IDLE:
> +		if (!fsm->id)
> +			drd_set_state(fsm, OTG_STATE_A_HOST);
> +		else if (fsm->b_sess_vld)
> +			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
> +		break;
> +	case OTG_STATE_B_PERIPHERAL:
> +		if (!fsm->id)
> +			drd_set_state(fsm, OTG_STATE_A_HOST);
> +		else if (!fsm->b_sess_vld)
> +			drd_set_state(fsm, OTG_STATE_B_IDLE);
> +		break;
> +	case OTG_STATE_A_HOST:
> +		if (fsm->id && fsm->b_sess_vld)
> +			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
> +		else if (fsm->id && !fsm->b_sess_vld)
> +			drd_set_state(fsm, OTG_STATE_B_IDLE);
> +		break;
> +
> +	/* invalid states for DRD */
> +	case OTG_STATE_B_SRP_INIT:
> +	case OTG_STATE_B_WAIT_ACON:
> +	case OTG_STATE_B_HOST:
> +	case OTG_STATE_A_IDLE:
> +	case OTG_STATE_A_WAIT_VRISE:
> +	case OTG_STATE_A_WAIT_BCON:
> +	case OTG_STATE_A_SUSPEND:
> +	case OTG_STATE_A_PERIPHERAL:
> +	case OTG_STATE_A_WAIT_VFALL:
> +	case OTG_STATE_A_VBUS_ERR:
> +		dev_err(otg->dev, "%s: otg: invalid usb-drd state: %s\n",
> +			__func__, usb_otg_state_string(state));
> +		drd_set_state(fsm, OTG_STATE_UNDEFINED);
> +	break;
> +	}
> +
> +	ret = fsm->state_changed;
> +	mutex_unlock(&fsm->lock);
> +	dev_dbg(otg->dev, "otg: quit statemachine, changed %d\n",
> +		fsm->state_changed);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(drd_statemachine);
> +
> +/**
> + * OTG FSM/DRD work function
> + */
> +static void usb_otg_work(struct work_struct *work)
> +{
> +	struct usb_otg *otg = container_of(work, struct usb_otg, work);
> +
> +	pm_runtime_get_sync(otg->dev);
> +	drd_statemachine(otg);
> +	pm_runtime_put_sync(otg->dev);
> +}
> +
> +/**
> + * usb_otg_register() - Register the OTG/dual-role device to OTG core
> + * @dev: OTG/dual-role controller device.
> + * @config: OTG configuration.
> + *
> + * Registers the OTG/dual-role controller device with the USB OTG core.
> + *
> + * Return: struct usb_otg * if success, ERR_PTR() if error.
> + */
> +struct usb_otg *usb_otg_register(struct device *dev,
> +				 struct usb_otg_config *config)
> +{
> +	struct usb_otg *otg;
> +	struct otg_wait_data *wait;
> +	int ret = 0;
> +
> +	if (!dev || !config || !config->fsm_ops)
> +		return ERR_PTR(-EINVAL);
> +
> +	/* already in list? */
> +	mutex_lock(&otg_list_mutex);
> +	if (usb_otg_get_data(dev)) {
> +		dev_err(dev, "otg: %s: device already in otg list\n",
> +			__func__);
> +		ret = -EINVAL;

Using -EEXIST please

> +		goto unlock;
> +	}
> +
> +	/* allocate and add to list */
> +	otg = kzalloc(sizeof(*otg), GFP_KERNEL);
> +	if (!otg) {
> +		ret = -ENOMEM;
> +		goto unlock;
> +	}
> +
> +	otg->dev = dev;
> +	otg->caps = config->otg_caps;
> +
> +	if ((otg->caps->hnp_support || otg->caps->srp_support ||
> +	     otg->caps->adp_support) && !config->otg_work)
> +		dev_info(dev, "otg: limiting to dual-role\n");
> +
> +	if (config->otg_work)	/* custom otg_work ? */
> +		INIT_WORK(&otg->work, config->otg_work);
> +	else
> +		INIT_WORK(&otg->work, usb_otg_work);
> +
> +	otg->wq = create_singlethread_workqueue("usb_otg");
> +	if (!otg->wq) {
> +		dev_err(dev, "otg: %s: can't create workqueue\n",
> +			__func__);
> +		ret = -ENOMEM;
> +		goto err_wq;
> +	}
> +
> +	/* set otg ops */
> +	otg->fsm.ops = config->fsm_ops;
> +
> +	mutex_init(&otg->fsm.lock);
> +
> +	list_add_tail(&otg->list, &otg_list);
> +	mutex_unlock(&otg_list_mutex);
> +
> +	/* were we in wait list? */
> +	mutex_lock(&wait_list_mutex);
> +	wait = usb_otg_get_wait(dev);
> +	mutex_unlock(&wait_list_mutex);
> +	if (wait) {
> +		/* register pending host/gadget and flush from list */
> +		usb_otg_flush_wait(dev);
> +	}
> +
> +	return otg;
> +
> +err_wq:
> +	kfree(otg);
> +unlock:
> +	mutex_unlock(&otg_list_mutex);
> +	return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_register);
> +
> +/**
> + * usb_otg_unregister() - Unregister the OTG/dual-role device from USB OTG core
> + * @dev: OTG controller device.
> + *
> + * Unregisters the OTG/dual-role controller device from USB OTG core.
> + * Prevents unregistering till both the associated Host and Gadget controllers
> + * have unregistered from the OTG core.
> + *
> + * Return: 0 on success, error value otherwise.
> + */
> +int usb_otg_unregister(struct device *dev)
> +{
> +	struct usb_otg *otg;
> +
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(dev);
> +	if (!otg) {
> +		dev_err(dev, "otg: %s: device not in otg list\n",
> +			__func__);
> +		mutex_unlock(&otg_list_mutex);
> +		return -EINVAL;
> +	}
> +
> +	/* prevent unregister till both host & gadget have unregistered */
> +	if (otg->host || otg->gadget) {
> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
> +			__func__);
> +		return -EBUSY;
> +	}
> +
> +	/* OTG FSM is halted when host/gadget unregistered */
> +	destroy_workqueue(otg->wq);
> +
> +	/* remove from otg list */
> +	list_del(&otg->list);
> +	kfree(otg);
> +	mutex_unlock(&otg_list_mutex);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_unregister);
> +
> +/**
> + * start/kick the OTG FSM if we can
> + * fsm->lock must be held
> + */
> +static void usb_otg_start_fsm(struct usb_otg *otg)
> +{
> +	struct otg_fsm *fsm = &otg->fsm;
> +
> +	if (fsm->running)
> +		goto kick_fsm;
> +
> +	if (!otg->host) {
> +		dev_info(otg->dev, "otg: can't start till host registers\n");
> +		return;
> +	}

dev_err

> +
> +	if (!otg->gadget) {
> +		dev_info(otg->dev, "otg: can't start till gadget registers\n");
> +		return;
> +	}

dev_err

> +
> +	fsm->running = true;
> +kick_fsm:
> +	queue_work(otg->wq, &otg->work);
> +}
> +
> +/**
> + * stop the OTG FSM. Stops Host & Gadget controllers as well.
> + * fsm->lock must be held
> + */
> +static void usb_otg_stop_fsm(struct usb_otg *otg)
> +{
> +	struct otg_fsm *fsm = &otg->fsm;
> +
> +	if (!fsm->running)
> +		return;
> +
> +	/* no more new events queued */
> +	fsm->running = false;
> +
> +	flush_workqueue(otg->wq);
> +	otg->state = OTG_STATE_UNDEFINED;
> +
> +	/* stop host/gadget immediately */
> +	if (fsm->protocol == PROTO_HOST)
> +		otg_start_host(otg, 0);
> +	else if (fsm->protocol == PROTO_GADGET)
> +		otg_start_gadget(otg, 0);
> +	fsm->protocol = PROTO_UNDEF;
> +}
> +
> +/**
> + * usb_otg_sync_inputs - Sync OTG inputs with the OTG state machine
> + * @fsm:	OTG FSM instance
> + *
> + * Used by the OTG driver to update the inputs to the OTG
> + * state machine.
> + *
> + * Can be called in IRQ context.
> + */
> +void usb_otg_sync_inputs(struct usb_otg *otg)
> +{
> +	/* Don't kick FSM till it has started */
> +	if (!otg->fsm.running)
> +		return;
> +
> +	/* Kick FSM */
> +	queue_work(otg->wq, &otg->work);
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_sync_inputs);
> +
> +/**
> + * usb_otg_kick_fsm - Kick the OTG state machine
> + * @otg_dev:	OTG controller device
> + *
> + * Used by USB host/device stack to sync OTG related
> + * events to the OTG state machine.
> + * e.g. change in host_bus->b_hnp_enable, gadget->b_hnp_enable
> + *
> + * Returns: 0 on success, error value otherwise.
> + */
> +int usb_otg_kick_fsm(struct device *otg_dev)
> +{
> +	struct usb_otg *otg;
> +
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(otg_dev);
> +	mutex_unlock(&otg_list_mutex);
> +	if (!otg) {
> +		dev_dbg(otg_dev, "otg: %s: invalid otg device\n",
> +			__func__);
> +		return -ENODEV;
> +	}
> +
> +	usb_otg_sync_inputs(otg);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_kick_fsm);
> +
> +/**
> + * usb_otg_register_hcd - Register the host controller to OTG core
> + * @hcd:	host controller device
> + * @irqnum:	interrupt number
> + * @irqflags:	interrupt flags
> + * @ops:	HCD ops to interface with the HCD
> + *
> + * This is used by the USB Host stack to register the host controller
> + * to the OTG core. Host controller must not be started by the
> + * caller as it is left upto the OTG state machine to do so.

%s/upto/up to

> + * hcd->otg_dev must contain the related otg controller device.
> + *
> + * Returns: 0 on success, error value otherwise.
> + */
> +int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> +			 unsigned long irqflags, struct otg_hcd_ops *ops)
> +{
> +	struct usb_otg *otg;
> +	struct device *hcd_dev = hcd->self.controller;
> +	struct device *otg_dev = hcd->otg_dev;
> +
> +	if (!otg_dev)
> +		return -EINVAL;
> +
> +	/* we're otg but otg controller might not yet be registered */
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(otg_dev);
> +	mutex_unlock(&otg_list_mutex);
> +	if (!otg) {
> +		dev_dbg(hcd_dev,
> +			"otg: controller not yet registered. waiting..\n");
> +		/*
> +		 * otg controller might register later. Put the hcd in
> +		 * wait list and call us back when ready
> +		 */
> +		if (usb_otg_hcd_wait_add(otg_dev, hcd, irqnum, irqflags, ops)) {
> +			dev_err(hcd_dev, "otg: failed to add hcd to wait list\n");
> +			return -EINVAL;
> +		}
> +
> +		return 0;
> +	}
> +
> +	/* HCD will be started by OTG fsm when needed */
> +	mutex_lock(&otg->fsm.lock);
> +	if (otg->primary_hcd.hcd) {
> +		/* probably a shared HCD ? */
> +		if (usb_otg_hcd_is_primary_hcd(hcd)) {
> +			dev_err(otg_dev, "otg: primary host already registered\n");
> +			goto err;
> +		}
> +
> +		if (hcd->shared_hcd == otg->primary_hcd.hcd) {
> +			if (otg->shared_hcd.hcd) {
> +				dev_err(otg_dev, "otg: shared host already registered\n");
> +				goto err;
> +			}
> +
> +			otg->shared_hcd.hcd = hcd;
> +			otg->shared_hcd.irqnum = irqnum;
> +			otg->shared_hcd.irqflags = irqflags;
> +			otg->shared_hcd.ops = ops;
> +			dev_info(otg_dev, "otg: shared host %s registered\n",
> +				 dev_name(hcd->self.controller));
> +		} else {
> +			dev_err(otg_dev, "otg: invalid shared host %s\n",
> +				dev_name(hcd->self.controller));
> +			goto err;
> +		}
> +	} else {
> +		if (!usb_otg_hcd_is_primary_hcd(hcd)) {
> +			dev_err(otg_dev, "otg: primary host must be registered first\n");
> +			goto err;
> +		}
> +
> +		otg->primary_hcd.hcd = hcd;
> +		otg->primary_hcd.irqnum = irqnum;
> +		otg->primary_hcd.irqflags = irqflags;
> +		otg->primary_hcd.ops = ops;
> +		otg->hcd_ops = ops;
> +		dev_info(otg_dev, "otg: primary host %s registered\n",
> +			 dev_name(hcd->self.controller));
> +	}
> +
> +	/*
> +	 * we're ready only if we have shared HCD
> +	 * or we don't need shared HCD.
> +	 */
> +	if (otg->shared_hcd.hcd || !otg->primary_hcd.hcd->shared_hcd) {
> +		otg->host = hcd_to_bus(hcd);
> +		/* FIXME: set bus->otg_port if this is true OTG port with HNP */
> +
> +		/* start FSM */
> +		usb_otg_start_fsm(otg);
> +	} else {
> +		dev_dbg(otg_dev, "otg: can't start till shared host registers\n");
> +	}
> +
> +	mutex_unlock(&otg->fsm.lock);
> +
> +	return 0;
> +
> +err:
> +	mutex_unlock(&otg->fsm.lock);
> +	return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_register_hcd);
> +
> +/**
> + * usb_otg_unregister_hcd - Unregister the host controller from OTG core
> + * @hcd:	host controller device
> + *
> + * This is used by the USB Host stack to unregister the host controller
> + * from the OTG core. Ensures that host controller is not running
> + * on successful return.
> + *
> + * Returns: 0 on success, error value otherwise.
> + */
> +int usb_otg_unregister_hcd(struct usb_hcd *hcd)
> +{
> +	struct usb_otg *otg;
> +	struct device *hcd_dev = hcd_to_bus(hcd)->controller;
> +	struct device *otg_dev = hcd->otg_dev;
> +
> +	if (!otg_dev)
> +		return -EINVAL;	/* we're definitely not OTG */
> +
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(otg_dev);
> +	mutex_unlock(&otg_list_mutex);
> +	if (!otg) {
> +		/* are we in wait list? */
> +		if (!usb_otg_hcd_wait_remove(hcd))
> +			return 0;
> +
> +		dev_dbg(hcd_dev, "otg: host wasn't registered with otg\n");
> +		return -EINVAL;
> +	}
> +
> +	mutex_lock(&otg->fsm.lock);
> +	if (hcd == otg->primary_hcd.hcd) {
> +		otg->primary_hcd.hcd = NULL;
> +		dev_info(otg_dev, "otg: primary host %s unregistered\n",
> +			 dev_name(hcd_dev));
> +	} else if (hcd == otg->shared_hcd.hcd) {
> +		otg->shared_hcd.hcd = NULL;
> +		dev_info(otg_dev, "otg: shared host %s unregistered\n",
> +			 dev_name(hcd_dev));
> +	} else {
> +		dev_err(otg_dev, "otg: host %s wasn't registered with otg\n",
> +			dev_name(hcd_dev));
> +		mutex_unlock(&otg->fsm.lock);
> +		return -EINVAL;
> +	}
> +
> +	/* stop FSM & Host */
> +	usb_otg_stop_fsm(otg);
> +	otg->host = NULL;
> +
> +	mutex_unlock(&otg->fsm.lock);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_unregister_hcd);
> +
> +/**
> + * usb_otg_register_gadget - Register the gadget controller to OTG core
> + * @gadget:	gadget controller
> + *
> + * This is used by the USB gadget stack to register the gadget controller
> + * to the OTG core. Gadget controller must not be started by the
> + * caller as it is left upto the OTG state machine to do so.

%s/upto/up to

> + *
> + * Gadget core must call this only when all resources required for
> + * gadget controller to run are available.
> + * i.e. gadget function driver is available.
> + *
> + * Returns: 0 on success, error value otherwise.
> + */
> +int usb_otg_register_gadget(struct usb_gadget *gadget,
> +			    struct otg_gadget_ops *ops)
> +{
> +	struct usb_otg *otg;
> +	struct device *gadget_dev = &gadget->dev;
> +	struct device *otg_dev = gadget->otg_dev;
> +
> +	if (!otg_dev)
> +		return -EINVAL;	/* we're definitely not OTG */
> +
> +	/* we're otg but otg controller might not yet be registered */
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(otg_dev);
> +	mutex_unlock(&otg_list_mutex);
> +	if (!otg) {
> +		dev_dbg(gadget_dev,
> +			"otg: controller not yet registered. waiting..\n");
> +		/*
> +		 * otg controller might register later. Put the gadget in
> +		 * wait list and call us back when ready
> +		 */
> +		if (usb_otg_gadget_wait_add(otg_dev, gadget, ops)) {
> +			dev_err(gadget_dev,
> +				"otg: failed to add to gadget to wait list\n");
> +			return -EINVAL;
> +		}
> +
> +		return 0;
> +	}
> +
> +	mutex_lock(&otg->fsm.lock);
> +	if (otg->gadget) {
> +		dev_err(otg_dev, "otg: gadget already registered with otg\n");
> +		mutex_unlock(&otg->fsm.lock);
> +		return -EINVAL;
> +	}
> +
> +	otg->gadget = gadget;
> +	otg->gadget_ops = ops;
> +	dev_info(otg_dev, "otg: gadget %s registered\n",
> +		 dev_name(&gadget->dev));
> +
> +	/* start FSM */
> +	usb_otg_start_fsm(otg);
> +	mutex_unlock(&otg->fsm.lock);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_register_gadget);
> +
> +/**
> + * usb_otg_unregister_gadget - Unregister the gadget controller from OTG core
> + * @gadget:	gadget controller
> + *
> + * This is used by the USB gadget stack to unregister the gadget controller
> + * from the OTG core. Ensures that gadget controller is halted
> + * on successful return.
> + *
> + * Returns: 0 on success, error value otherwise.
> + */
> +int usb_otg_unregister_gadget(struct usb_gadget *gadget)
> +{
> +	struct usb_otg *otg;
> +	struct device *gadget_dev = &gadget->dev;
> +	struct device *otg_dev = gadget->otg_dev;
> +
> +	if (!otg_dev)
> +		return -EINVAL;
> +
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(otg_dev);
> +	mutex_unlock(&otg_list_mutex);
> +	if (!otg) {
> +		/* are we in wait list? */
> +		if (!usb_otg_gadget_wait_remove(gadget))
> +			return 0;
> +
> +		dev_dbg(gadget_dev, "otg: gadget wasn't registered with otg\n");
> +		return -EINVAL;
> +	}
> +
> +	mutex_lock(&otg->fsm.lock);
> +	if (otg->gadget != gadget) {
> +		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
> +			dev_name(&gadget->dev));
> +		mutex_unlock(&otg->fsm.lock);
> +		return -EINVAL;
> +	}
> +
> +	/* Stop FSM & gadget */
> +	usb_otg_stop_fsm(otg);
> +	otg->gadget = NULL;
> +	mutex_unlock(&otg->fsm.lock);
> +
> +	dev_info(otg_dev, "otg: gadget %s unregistered\n",
> +		 dev_name(&gadget->dev));
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_unregister_gadget);
> diff --git a/drivers/usb/common/usb-otg.h b/drivers/usb/common/usb-otg.h
> new file mode 100644
> index 0000000..2bf3fbf
> --- /dev/null
> +++ b/drivers/usb/common/usb-otg.h
> @@ -0,0 +1,71 @@
> +/**
> + * drivers/usb/common/usb-otg.h - USB OTG core local header
> + *
> + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com
> + * Author: Roger Quadros <rogerq@...com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __DRIVERS_USB_COMMON_USB_OTG_H
> +#define __DRIVERS_USB_COMMON_USB_OTG_H
> +
> +/*
> + *  A-DEVICE timing constants
> + */
> +
> +/* Wait for VBUS Rise  */
> +#define TA_WAIT_VRISE        (100)	/* a_wait_vrise: section 7.1.2
> +					 * a_wait_vrise_tmr: section 7.4.5.1
> +					 * TA_VBUS_RISE <= 100ms, section 4.4
> +					 * Table 4-1: Electrical Characteristics
> +					 * ->DC Electrical Timing
> +					 */
> +/* Wait for VBUS Fall  */
> +#define TA_WAIT_VFALL        (1000)	/* a_wait_vfall: section 7.1.7
> +					 * a_wait_vfall_tmr: section: 7.4.5.2
> +					 */
> +/* Wait for B-Connect */
> +#define TA_WAIT_BCON         (10000)	/* a_wait_bcon: section 7.1.3
> +					 * TA_WAIT_BCON: should be between 1100
> +					 * and 30000 ms, section 5.5, Table 5-1
> +					 */
> +/* A-Idle to B-Disconnect */
> +#define TA_AIDL_BDIS         (5000)	/* a_suspend min 200 ms, section 5.2.1
> +					 * TA_AIDL_BDIS: section 5.5, Table 5-1
> +					 */
> +/* B-Idle to A-Disconnect */
> +#define TA_BIDL_ADIS         (500)	/* TA_BIDL_ADIS: section 5.2.1
> +					 * 500ms is used for B switch to host
> +					 * for safe
> +					 */
> +
> +/*
> + * B-device timing constants
> + */
> +
> +/* Data-Line Pulse Time*/
> +#define TB_DATA_PLS          (10)	/* b_srp_init,continue 5~10ms
> +					 * section:5.1.3
> +					 */
> +/* SRP Fail Time  */
> +#define TB_SRP_FAIL          (6000)	/* b_srp_init,fail time 5~6s
> +					 * section:5.1.6
> +					 */
> +/* A-SE0 to B-Reset  */
> +#define TB_ASE0_BRST         (155)	/* minimum 155 ms, section:5.3.1 */
> +/* SE0 Time Before SRP */
> +#define TB_SE0_SRP           (1000)	/* b_idle,minimum 1s, section:5.1.2 */
> +/* SSEND time before SRP */
> +#define TB_SSEND_SRP         (1500)	/* minimum 1.5 sec, section:5.1.2 */
> +
> +#define TB_SESS_VLD          (1000)
> +

Since this set is mainly for DRD, these FSM stuffs aren't needed.
Besides, there is already an otg-fsm.h at include/linux/usb/, and
there are both otg and otg-fsm source and headers, we may let these
timing thing belong to otg-fsm.

> +#endif /* __DRIVERS_USB_COMMON_USB_OTG_H */
> diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
> index ae228d0..b468a9f 100644
> --- a/drivers/usb/core/Kconfig
> +++ b/drivers/usb/core/Kconfig
> @@ -42,7 +42,7 @@ config USB_DYNAMIC_MINORS
>  	  If you are unsure about this, say N here.
>  
>  config USB_OTG
> -	bool "OTG support"
> +	bool "OTG/Dual-role support"
>  	depends on PM
>  	default n
>  	help
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index 8c0ae64..1878ae1 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -583,6 +583,7 @@ struct usb_gadget_ops {
>   * @out_epnum: last used out ep number
>   * @in_epnum: last used in ep number
>   * @otg_caps: OTG capabilities of this gadget.
> + * @otg_dev: OTG controller device, if needs to be used with OTG core.
>   * @sg_supported: true if we can handle scatter-gather
>   * @is_otg: True if the USB device port uses a Mini-AB jack, so that the
>   *	gadget driver must provide a USB OTG descriptor.
> @@ -639,6 +640,7 @@ struct usb_gadget {
>  	unsigned			out_epnum;
>  	unsigned			in_epnum;
>  	struct usb_otg_caps		*otg_caps;
> +	struct device			*otg_dev;
>  
>  	unsigned			sg_supported:1;
>  	unsigned			is_otg:1;
> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> index 861ccaa..2017cd4 100644
> --- a/include/linux/usb/hcd.h
> +++ b/include/linux/usb/hcd.h
> @@ -184,6 +184,7 @@ struct usb_hcd {
>  	struct mutex		*bandwidth_mutex;
>  	struct usb_hcd		*shared_hcd;
>  	struct usb_hcd		*primary_hcd;
> +	struct device		*otg_dev;	/* OTG controller device */
>  
>  
>  #define HCD_BUFFER_POOLS	4
> diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
> index 36f0cf9..ba6755c 100644
> --- a/include/linux/usb/otg-fsm.h
> +++ b/include/linux/usb/otg-fsm.h
> @@ -61,6 +61,11 @@ enum otg_fsm_timer {
>  /**
>   * struct otg_fsm - OTG state machine according to the OTG spec
>   *
> + * DRD mode hardware Inputs
> + *
> + * @id:		TRUE for B-device, FALSE for A-device.
> + * @b_sess_vld:	VBUS voltage in regulation.
> + *
>   * OTG hardware Inputs
>   *
>   *	Common inputs for A and B device
> @@ -133,6 +138,7 @@ enum otg_fsm_timer {
>   * a_clr_err:	Asserted (by application ?) to clear a_vbus_err due to an
>   *		overcurrent condition and causes the A-device to transition
>   *		to a_wait_vfall
> + * running:	state machine running/stopped indicator
>   */
>  struct otg_fsm {
>  	/* Input */
> @@ -188,6 +194,7 @@ struct otg_fsm {
>  	int b_ase0_brst_tmout;
>  	int a_bidl_adis_tmout;
>  
> +	bool running;
>  	struct otg_fsm_ops *ops;
>  
>  	/* Current usb protocol used: 0:undefine; 1:host; 2:client */
> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> index 85b8fb5..b094352 100644
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -10,10 +10,55 @@
>  #define __LINUX_USB_OTG_H
>  
>  #include <linux/phy/phy.h>
> -#include <linux/usb/phy.h>
> -#include <linux/usb/otg-fsm.h>
> +#include <linux/device.h>
> +#include <linux/hrtimer.h>
> +#include <linux/ktime.h>

Does above two headers are really needed?

> +#include <linux/usb.h>
>  #include <linux/usb/hcd.h>
> +#include <linux/usb/gadget.h>
> +#include <linux/usb/otg-fsm.h>
> +#include <linux/usb/phy.h>

Does above header is really needed?

>  
> +/**
> + * struct otg_hcd - host controller state and interface
> + *
> + * @hcd: host controller
> + * @irqnum: irq number
> + * @irqflags: irq flags
> + * @ops: otg to host controller interface
> + * @ops: otg to host controller interface

Duplicated line

-- 

Best Regards,
Peter Chen

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