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Date: Mon, 13 Jul 2015 13:20:43 +0300
From: Roger Quadros <rogerq@...com>
To: Peter Chen <peter.chen@...escale.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>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 07/11] usb: otg: add OTG core
On 13/07/15 05:14, Peter Chen wrote:
> On Wed, Jul 08, 2015 at 01:19:33PM +0300, Roger Quadros wrote:
>> The OTG core instantiates the OTG Finite State Machine
>> per OTG controller and manages starting/stopping the
>> host and gadget controllers based on the bus state.
>>
>> It provides APIs for the following tasks
>>
>> - Registering an OTG capable controller
>> - Registering Host and Gadget controllers to OTG core
>> - Providing inputs to and kicking the OTG state machine
>>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>> MAINTAINERS | 4 +-
>> drivers/usb/Kconfig | 2 +-
>> drivers/usb/Makefile | 1 +
>> drivers/usb/common/Makefile | 3 +-
>> drivers/usb/common/usb-otg.c | 768 +++++++++++++++++++++++++++++++++++++++++++
>> drivers/usb/common/usb-otg.h | 71 ++++
>> drivers/usb/core/Kconfig | 11 +-
>> include/linux/usb/otg.h | 91 ++++-
>> 8 files changed, 930 insertions(+), 21 deletions(-)
>> create mode 100644 drivers/usb/common/usb-otg.c
>> create mode 100644 drivers/usb/common/usb-otg.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 8133cef..b21278e 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -10640,12 +10640,14 @@ S: Maintained
>> F: Documentation/usb/ohci.txt
>> F: drivers/usb/host/ohci*
>>
>> -USB OTG FSM (Finite State Machine)
>> +USB OTG/DRD core and FSM (Finite State Machine)
>> M: Peter Chen <Peter.Chen@...escale.com>
>> +M: Roger Quadros <rogerq@...com>
>> T: git git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git
>> L: linux-usb@...r.kernel.org
>> S: Maintained
>> F: drivers/usb/common/usb-otg-fsm.c
>> +F: drivers/usb/common/usb-otg.c
>>
>> USB OVER IP DRIVER
>> M: Valentina Manea <valentina.manea.m@...il.com>
>> diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
>> index 8ed451d..5b625e2 100644
>> --- a/drivers/usb/Kconfig
>> +++ b/drivers/usb/Kconfig
>> @@ -32,7 +32,7 @@ if USB_SUPPORT
>> config USB_COMMON
>> tristate
>> default y
>> - depends on USB || USB_GADGET
>> + depends on USB || USB_GADGET || USB_OTG
>>
>
> USB_OTG can depends on USB || UB_GADGET?
I didn't understand. The above is for USB_COMMON.
>
>> config USB_ARCH_HAS_HCD
>> def_bool y
>> diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
>> index d8926c6..769d13b 100644
>> --- a/drivers/usb/Makefile
>> +++ b/drivers/usb/Makefile
>> @@ -60,5 +60,6 @@ obj-$(CONFIG_USB_RENESAS_USBHS) += renesas_usbhs/
>> obj-$(CONFIG_USB_GADGET) += gadget/
>>
>> obj-$(CONFIG_USB_COMMON) += common/
>> +obj-$(CONFIG_USB_OTG) += common/
>>
>
> The comment like above.
What should it look like?
>
>> obj-$(CONFIG_USBIP_CORE) += usbip/
>> diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
>> index 6bbb3ec..730d928 100644
>> --- a/drivers/usb/common/Makefile
>> +++ b/drivers/usb/common/Makefile
>> @@ -6,5 +6,6 @@ obj-$(CONFIG_USB_COMMON) += usb-common.o
>> usb-common-y += common.o
>> usb-common-$(CONFIG_USB_LED_TRIG) += led.o
>>
>> -obj-$(CONFIG_USB_OTG_FSM) += usb-otg-fsm.o
>> obj-$(CONFIG_USB_ULPI_BUS) += ulpi.o
>> +usbotg-y := usb-otg.o usb-otg-fsm.o
>> +obj-$(CONFIG_USB_OTG) += usbotg.o
>> diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
>> new file mode 100644
>> index 0000000..0379034
>> --- /dev/null
>> +++ b/drivers/usb/common/usb-otg.c
>> @@ -0,0 +1,768 @@
>> +/**
>> + * drivers/usb/common/usb-otg.c - USB OTG core
>> + *
>> + * 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.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/ktime.h>
>> +#include <linux/hrtimer.h>
>> +#include <linux/list.h>
>> +#include <linux/usb/otg.h>
>> +#include <linux/usb/phy.h> /* enum usb_otg_state */
>> +#include <linux/usb/gadget.h>
>> +#include <linux/workqueue.h>
>> +
>> +#include "usb-otg.h"
>> +
>> +/* to link timer with callback data */
>> +struct otg_timer {
>> + struct hrtimer timer;
>> + ktime_t timeout;
>> + /* callback data */
>> + int *timeout_bit;
>> + struct otg_data *otgd;
>> +};
>> +
>> +struct otg_hcd {
>> + struct usb_hcd *hcd;
>> + unsigned int irqnum;
>> + unsigned long irqflags;
>> + struct otg_hcd_ops *ops;
>> +};
>> +
>> +struct otg_data {
>> + struct device *dev; /* HCD & GCD's parent device */
>> +
>> + struct otg_fsm fsm;
>> + /* HCD, GCD and usb_otg_state are present in otg_fsm->otg
>> + * HCD is bus_to_hcd(fsm->otg->host)
>> + * GCD is fsm->otg->gadget
>> + */
>> + struct otg_fsm_ops fsm_ops; /* private copy for override */
>> + struct usb_otg otg; /* allocator for fsm->otg */
>> +
>> + struct otg_hcd primary_hcd;
>> + struct otg_hcd shared_hcd;
>> +
>> + struct otg_gadget_ops *gadget_ops; /* interface to gadget f/w */
>> +
>> + /* saved hooks to OTG device */
>> + int (*start_host)(struct otg_fsm *fsm, int on);
>> + int (*start_gadget)(struct otg_fsm *fsm, int on);
>> +
>> + struct list_head list;
>> +
>> + struct work_struct work; /* OTG FSM work */
>> + struct workqueue_struct *wq;
>> +
>> + struct otg_timer timers[NUM_OTG_FSM_TIMERS];
>> +
>> + bool fsm_running;
>> + /* use otg->fsm.lock for serializing access */
>> +};
>> +
>
> Would you consider enhance struct usb_otg, and instead of this
> structure, I am wonder similar structures may increase the confuse
> in future.
Yes, that should be possible.
cheers,
-roger
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