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Message-ID: <20150908083059.GD7802@shlinux2>
Date: Tue, 8 Sep 2015 16:31:00 +0800
From: Peter Chen <peter.chen@...escale.com>
To: Roger Quadros <rogerq@...com>
CC: <stern@...land.harvard.edu>, <balbi@...com>,
<gregkh@...uxfoundation.org>, <dan.j.williams@...el.com>,
<jun.li@...escale.com>, <mathias.nyman@...ux.intel.com>,
<tony@...mide.com>, <Joao.Pinto@...opsys.com>,
<abrestic@...omium.org>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v4 07/13] usb: otg: add OTG core
On Mon, Sep 07, 2015 at 01:23:01PM +0300, Roger Quadros wrote:
> On 07/09/15 04:23, Peter Chen wrote:
> > On Mon, Aug 24, 2015 at 04:21:18PM +0300, Roger Quadros wrote:
> >> + * 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.
> >> + *
> >> + * 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 *otgd;
> >> + struct device *hcd_dev = hcd->self.controller;
> >> + struct device *otg_dev = usb_otg_get_device(hcd_dev);
> >> +
> >
> > One big problem here is: there are two designs for current (IP) driver
> > code, one creates dedicated hcd device as roothub's parent, like dwc3.
> > Another one doesn't do this, roothub's parent is core device (or otg device
> > in your patch), like chipidea and dwc2.
> >
> > Then, otg_dev will be glue layer device for chipidea after that.
>
> OK. Let's add a way for the otg controller driver to provide the host and gadget
> information to the otg core for such devices like chipidea and dwc2.
>
Roger, not only chipidea and dwc2, I think the musb uses the same
hierarchy. If the host, device, and otg share the same register
region, host part can't be a platform driver since we don't want
to remap the same register region again.
So, in the design, we may need to consider both situations, one
is otg/host/device has its own register region, and host is a
separate platform device (A), the other is three parts share the
same register region, there is only one platform driver (B).
A:
IP core device
|
|
|-----|-----|
gadget host platform device
|
roothub
B:
IP core device
|
|
|-----|-----|
gadget roothub
> This API must be called before the hcd/gadget-driver is added so that the otg
> core knows it's linked to an OTG controller.
>
> Any better idea?
>
A flag stands for this hcd controller is the same with otg controller
can be used, this flag can be stored at struct usb_otg_config.
Peter
P.S: I still read your code, I find not all APIs in this file are used
in your dwc3 example.
> >
> >> + 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);
> >> + otgd = usb_otg_get_data(otg_dev);
> >> + mutex_unlock(&otg_list_mutex);
> >> + if (!otgd) {
> >> + 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_dbg(hcd_dev, "otg: failed to add to wait list\n");
> >> + return -EINVAL;
> >> + }
> >> +
> >> + return 0;
> >> + }
> >> +
> >> + /* HCD will be started by OTG fsm when needed */
> >> + mutex_lock(&otgd->fsm.lock);
> >> + if (otgd->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 == otgd->primary_hcd.hcd) {
> >> + if (otgd->shared_hcd.hcd) {
> >> + dev_err(otg_dev, "otg: shared host already registered\n");
> >> + goto err;
> >> + }
> >> +
> >> + otgd->shared_hcd.hcd = hcd;
> >> + otgd->shared_hcd.irqnum = irqnum;
> >> + otgd->shared_hcd.irqflags = irqflags;
> >> + otgd->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;
> >> + }
> >> +
> >> + otgd->primary_hcd.hcd = hcd;
> >> + otgd->primary_hcd.irqnum = irqnum;
> >> + otgd->primary_hcd.irqflags = irqflags;
> >> + otgd->primary_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 (otgd->shared_hcd.hcd || !otgd->primary_hcd.hcd->shared_hcd) {
> >> + otgd->fsm.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(&otgd->fsm);
> >> + } else {
> >> + dev_dbg(otg_dev, "otg: can't start till shared host registers\n");
> >> + }
> >> +
> >> + mutex_unlock(&otgd->fsm.lock);
> >> +
> >> + return 0;
> >> +
> >> +err:
> >> + mutex_unlock(&otgd->fsm.lock);
> >> + return -EINVAL;
> >> +}
> >> +EXPORT_SYMBOL_GPL(usb_otg_register_hcd);
> >> +
> >> +/**
> >> + * usb_otg_unregister_hcd - Unregister 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 *otgd;
> >> + struct device *hcd_dev = hcd_to_bus(hcd)->controller;
> >> + struct device *otg_dev = usb_otg_get_device(hcd_dev);
> >> +
> >> + if (!otg_dev)
> >> + return -EINVAL; /* we're definitely not OTG */
> >> +
> >> + mutex_lock(&otg_list_mutex);
> >> + otgd = usb_otg_get_data(otg_dev);
> >> + mutex_unlock(&otg_list_mutex);
> >> + if (!otgd) {
> >> + /* 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(&otgd->fsm.lock);
> >> + if (hcd == otgd->primary_hcd.hcd) {
> >> + otgd->primary_hcd.hcd = NULL;
> >> + dev_info(otg_dev, "otg: primary host %s unregistered\n",
> >> + dev_name(hcd_dev));
> >> + } else if (hcd == otgd->shared_hcd.hcd) {
> >> + otgd->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(&otgd->fsm.lock);
> >> + return -EINVAL;
> >> + }
> >> +
> >> + /* stop FSM & Host */
> >> + usb_otg_stop_fsm(&otgd->fsm);
> >> + otgd->fsm.otg->host = NULL;
> >> +
> >> + mutex_unlock(&otgd->fsm.lock);
> >> +
> >> + return 0;
> >> +}
> >> +EXPORT_SYMBOL_GPL(usb_otg_unregister_hcd);
> >> +
> >> +/**
> >> + * usb_otg_register_gadget - Register 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.
> >> + *
> >> + * 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 *otgd;
> >> + struct device *gadget_dev = &gadget->dev;
> >> + struct device *otg_dev = usb_otg_get_device(gadget_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);
> >> + otgd = usb_otg_get_data(otg_dev);
> >> + mutex_unlock(&otg_list_mutex);
> >> + if (!otgd) {
> >> + 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_dbg(gadget_dev, "otg: failed to add to wait list\n");
> >> + return -EINVAL;
> >> + }
> >> +
> >> + return 0;
> >> + }
> >> +
> >> + mutex_lock(&otgd->fsm.lock);
> >> + if (otgd->fsm.otg->gadget) {
> >> + dev_err(otg_dev, "otg: gadget already registered with otg\n");
> >> + mutex_unlock(&otgd->fsm.lock);
> >> + return -EINVAL;
> >> + }
> >> +
> >> + otgd->fsm.otg->gadget = gadget;
> >> + otgd->gadget_ops = ops;
> >> + dev_info(otg_dev, "otg: gadget %s registered\n",
> >> + dev_name(&gadget->dev));
> >> +
> >> + /* start FSM */
> >> + usb_otg_start_fsm(&otgd->fsm);
> >> + mutex_unlock(&otgd->fsm.lock);
> >> +
> >> + return 0;
> >> +}
> >> +EXPORT_SYMBOL_GPL(usb_otg_register_gadget);
> >> +
> >> +/**
> >> + * usb_otg_unregister_gadget - Unregister 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 not running
> >> + * on successful return.
> >> + *
> >> + * Returns: 0 on success, error value otherwise.
> >> + */
> >> +int usb_otg_unregister_gadget(struct usb_gadget *gadget)
> >> +{
> >> + struct usb_otg *otgd;
> >> + struct device *gadget_dev = &gadget->dev;
> >> + struct device *otg_dev = usb_otg_get_device(gadget_dev);
> >> +
> >> + if (!otg_dev)
> >> + return -EINVAL;
> >> +
> >> + mutex_lock(&otg_list_mutex);
> >> + otgd = usb_otg_get_data(otg_dev);
> >> + mutex_unlock(&otg_list_mutex);
> >> + if (!otgd) {
> >> + /* 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(&otgd->fsm.lock);
> >> + if (otgd->fsm.otg->gadget != gadget) {
> >> + dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
> >> + dev_name(&gadget->dev));
> >> + mutex_unlock(&otgd->fsm.lock);
> >> + return -EINVAL;
> >> + }
> >> +
> >> + /* Stop FSM & gadget */
> >> + usb_otg_stop_fsm(&otgd->fsm);
> >> + otgd->fsm.otg->gadget = NULL;
> >> + mutex_unlock(&otgd->fsm.lock);
> >> +
> >> + dev_info(otg_dev, "otg: gadget %s unregistered\n",
> >> + dev_name(&gadget->dev));
> >> +
> >> + return 0;
> >> +}
> >> +EXPORT_SYMBOL_GPL(usb_otg_unregister_gadget);
> >> +
> >> +/**
> >> + * usb_otg_fsm_to_dev - Get OTG controller device from struct otg_fsm
> >> + * @fsm: otg_fsm data structure
> >> + *
> >> + * This is used by the OTG controller driver to get it's device node
> >> + * from any of the otg_fsm->ops.
> >> + */
> >> +struct device *usb_otg_fsm_to_dev(struct otg_fsm *fsm)
> >> +{
> >> + struct usb_otg *otgd = container_of(fsm, struct usb_otg, fsm);
> >> +
> >> + return otgd->dev;
> >> +}
> >> +EXPORT_SYMBOL_GPL(usb_otg_fsm_to_dev);
> >> diff --git a/drivers/usb/common/usb-otg.h b/drivers/usb/common/usb-otg.h
> >> new file mode 100644
> >> index 0000000..05331f0
> >> --- /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) 2015 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)
> >> +
> >> +#endif /* __DRIVERS_USB_COMMON_USB_OTG_H */
> >> diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
> >> index a99c89e..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
> >> @@ -75,15 +75,6 @@ config USB_OTG_BLACKLIST_HUB
> >> and software costs by not supporting external hubs. So
> >> are "Embedded Hosts" that don't offer OTG support.
> >>
> >> -config USB_OTG_FSM
> >> - tristate "USB 2.0 OTG FSM implementation"
> >> - depends on USB
> >> - select USB_OTG
> >> - select USB_PHY
> >> - help
> >> - Implements OTG Finite State Machine as specified in On-The-Go
> >> - and Embedded Host Supplement to the USB Revision 2.0 Specification.
> >> -
> >> config USB_ULPI_BUS
> >> tristate "USB ULPI PHY interface support"
> >> depends on USB_SUPPORT
> >> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> >> index bd1dcf8..38cabe0 100644
> >> --- a/include/linux/usb/otg.h
> >> +++ b/include/linux/usb/otg.h
> >> @@ -10,19 +10,100 @@
> >> #define __LINUX_USB_OTG_H
> >>
> >> #include <linux/phy/phy.h>
> >> +#include <linux/device.h>
> >> +#include <linux/hrtimer.h>
> >> +#include <linux/ktime.h>
> >> +#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>
> >>
> >> +/**
> >> + * struct otg_hcd - host controller state and interface
> >> + *
> >> + * @hcd: host controller
> >> + * @irqnum: irq number
> >> + * @irqflags: irq flags
> >> + * @ops: otg to host controller interface
> >> + */
> >> +struct otg_hcd {
> >> + struct usb_hcd *hcd;
> >> + unsigned int irqnum;
> >> + unsigned long irqflags;
> >> + struct otg_hcd_ops *ops;
> >> +};
> >> +
> >> +struct usb_otg;
> >> +
> >> +/**
> >> + * struct otg_timer - otg timer data
> >> + *
> >> + * @timer: high resolution timer
> >> + * @timeout: timeout value
> >> + * @timetout_bit: pointer to variable that is set on timeout
> >> + * @otgd: usb otg data
> >> + */
> >> +struct otg_timer {
> >> + struct hrtimer timer;
> >> + ktime_t timeout;
> >> + /* callback data */
> >> + int *timeout_bit;
> >> + struct usb_otg *otgd;
> >> +};
> >> +
> >> +/**
> >> + * struct usb_otg - usb otg controller state
> >> + *
> >> + * @default_a: Indicates we are an A device. i.e. Host.
> >> + * @phy: USB phy interface
> >> + * @usb_phy: old usb_phy interface
> >> + * @host: host controller bus
> >> + * @gadget: gadget device
> >> + * @state: current otg state
> >> + * @dev: otg controller device
> >> + * @caps: otg capabilities revision, hnp, srp, etc
> >> + * @fsm: otg finite state machine
> >> + * @fsm_ops: controller hooks for the state machine
> >> + * ------- internal use only -------
> >> + * @primary_hcd: primary host state and interface
> >> + * @shared_hcd: shared host state and interface
> >> + * @gadget_ops: gadget interface
> >> + * @timers: otg timers for state machine
> >> + * @list: list of otg controllers
> >> + * @work: otg state machine work
> >> + * @wq: otg state machine work queue
> >> + * @fsm_running: state machine running/stopped indicator
> >> + */
> >> struct usb_otg {
> >> u8 default_a;
> >>
> >> struct phy *phy;
> >> /* old usb_phy interface */
> >> struct usb_phy *usb_phy;
> >> +
> >> struct usb_bus *host;
> >> struct usb_gadget *gadget;
> >>
> >> enum usb_otg_state state;
> >>
> >> + struct device *dev;
> >> + struct usb_otg_caps *caps;
> >> + struct otg_fsm fsm;
> >> + struct otg_fsm_ops fsm_ops;
> >> +
> >> + /* internal use only */
> >> + struct otg_hcd primary_hcd;
> >> + struct otg_hcd shared_hcd;
> >> + struct otg_gadget_ops *gadget_ops;
> >> + struct otg_timer timers[NUM_OTG_FSM_TIMERS];
> >> + struct list_head list;
> >> + struct work_struct work;
> >> + struct workqueue_struct *wq;
> >> + bool fsm_running;
> >> + /* use otg->fsm.lock for serializing access */
> >> +
> >> +/*------------- deprecated interface -----------------------------*/
> >> /* bind/unbind the host controller */
> >> int (*set_host)(struct usb_otg *otg, struct usb_bus *host);
> >>
> >> @@ -38,7 +119,7 @@ struct usb_otg {
> >>
> >> /* start or continue HNP role switch */
> >> int (*start_hnp)(struct usb_otg *otg);
> >> -
> >> +/*---------------------------------------------------------------*/
> >> };
> >>
> >> /**
> >> @@ -56,8 +137,105 @@ struct usb_otg_caps {
> >> bool adp_support;
> >> };
> >>
> >> +/**
> >> + * struct usb_otg_config - otg controller configuration
> >> + * @caps: otg capabilities of the controller
> >> + * @ops: otg fsm operations
> >> + * @otg_timeouts: override default otg fsm timeouts
> >> + */
> >> +struct usb_otg_config {
> >> + struct usb_otg_caps otg_caps;
> >> + struct otg_fsm_ops *fsm_ops;
> >> + unsigned otg_timeouts[NUM_OTG_FSM_TIMERS];
> >> +};
> >> +
> >> extern const char *usb_otg_state_string(enum usb_otg_state state);
> >>
> >> +enum usb_dr_mode {
> >> + USB_DR_MODE_UNKNOWN,
> >> + USB_DR_MODE_HOST,
> >> + USB_DR_MODE_PERIPHERAL,
> >> + USB_DR_MODE_OTG,
> >> +};
> >> +
> >> +#if IS_ENABLED(CONFIG_USB_OTG)
> >> +struct otg_fsm *usb_otg_register(struct device *dev,
> >> + struct usb_otg_config *config);
> >> +int usb_otg_unregister(struct device *dev);
> >> +int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> >> + unsigned long irqflags, struct otg_hcd_ops *ops);
> >> +int usb_otg_unregister_hcd(struct usb_hcd *hcd);
> >> +int usb_otg_register_gadget(struct usb_gadget *gadget,
> >> + struct otg_gadget_ops *ops);
> >> +int usb_otg_unregister_gadget(struct usb_gadget *gadget);
> >> +void usb_otg_sync_inputs(struct otg_fsm *fsm);
> >> +int usb_otg_kick_fsm(struct device *hcd_gcd_device);
> >> +struct device *usb_otg_fsm_to_dev(struct otg_fsm *fsm);
> >> +int usb_otg_start_host(struct otg_fsm *fsm, int on);
> >> +int usb_otg_start_gadget(struct otg_fsm *fsm, int on);
> >> +
> >> +#else /* CONFIG_USB_OTG */
> >> +
> >> +static inline struct otg_fsm *usb_otg_register(struct device *dev,
> >> + struct usb_otg_config *config)
> >> +{
> >> + return ERR_PTR(-ENOTSUPP);
> >> +}
> >> +
> >> +static inline int usb_otg_unregister(struct device *dev)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +
> >> +static inline int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> >> + unsigned long irqflags,
> >> + struct otg_hcd_ops *ops)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +
> >> +static inline int usb_otg_unregister_hcd(struct usb_hcd *hcd)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +
> >> +static inline int usb_otg_register_gadget(struct usb_gadget *gadget,
> >> + struct otg_gadget_ops *ops)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +
> >> +static inline int usb_otg_unregister_gadget(struct usb_gadget *gadget)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +
> >> +static inline void usb_otg_sync_inputs(struct otg_fsm *fsm)
> >> +{
> >> +}
> >> +
> >> +static inline int usb_otg_kick_fsm(struct device *hcd_gcd_device)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +
> >> +static inline struct device *usb_otg_fsm_to_dev(struct otg_fsm *fsm)
> >> +{
> >> + return NULL;
> >> +}
> >> +
> >> +static inline int usb_otg_start_host(struct otg_fsm *fsm, int on)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +
> >> +static inline int usb_otg_start_gadget(struct otg_fsm *fsm, int on)
> >> +{
> >> + return -ENOTSUPP;
> >> +}
> >> +#endif /* CONFIG_USB_OTG */
> >> +
> >> +/*------------- deprecated interface -----------------------------*/
> >> /* Context: can sleep */
> >> static inline int
> >> otg_start_hnp(struct usb_otg *otg)
> >> @@ -109,14 +287,9 @@ otg_start_srp(struct usb_otg *otg)
> >> return -ENOTSUPP;
> >> }
> >>
> >> +/*---------------------------------------------------------------*/
> >> +
> >> /* for OTG controller drivers (and maybe other stuff) */
> >> extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
> >>
> >> -enum usb_dr_mode {
> >> - USB_DR_MODE_UNKNOWN,
> >> - USB_DR_MODE_HOST,
> >> - USB_DR_MODE_PERIPHERAL,
> >> - USB_DR_MODE_OTG,
> >> -};
> >> -
> >> #endif /* __LINUX_USB_OTG_H */
> >> --
> >> 2.1.4
> >>
> >
--
Best Regards,
Peter Chen
--
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