linux-kernel - Re: [PATCH v4 10/13] usb: hcd: Adapt to OTG core

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Date:	Wed, 9 Sep 2015 12:39:16 +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>,
	<abrestic@...omium.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v4 10/13] usb: hcd: Adapt to OTG core

On 09/09/15 05:23, Peter Chen wrote:
> On Mon, Aug 24, 2015 at 04:21:21PM +0300, Roger Quadros wrote:
>> The existing usb_add/remove_hcd() functionality
>> remains unchanged for non-OTG devices. For OTG
>> devices they only register the HCD with the OTG core.
>>
>> Introduce usb_otg_add/remove_hcd() for use by OTG core.
>> These functions actually add/remove the HCD.
>>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>>  drivers/usb/core/hcd.c | 55 +++++++++++++++++++++++++++++++++++++++++++++-----
>>  1 file changed, 50 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
>> index c0fd1f6..4851682 100644
>> --- a/drivers/usb/core/hcd.c
>> +++ b/drivers/usb/core/hcd.c
>> @@ -46,6 +46,7 @@
>>  #include <linux/usb.h>
>>  #include <linux/usb/hcd.h>
>>  #include <linux/usb/phy.h>
>> +#include <linux/usb/otg.h>
>>  
>>  #include "usb.h"
>>  
>> @@ -2625,8 +2626,8 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
>>   * buffers of consistent memory, register the bus, request the IRQ line,
>>   * and call the driver's reset() and start() routines.
>>   */
>> -int usb_add_hcd(struct usb_hcd *hcd,
>> -		unsigned int irqnum, unsigned long irqflags)
>> +static int usb_otg_add_hcd(struct usb_hcd *hcd,
>> +			   unsigned int irqnum, unsigned long irqflags)
> 
> You may change the kernel doc to this name too.

Yes.

> 
>>  {
>>  	int retval;
>>  	struct usb_device *rhdev;
>> @@ -2839,17 +2840,16 @@ err_phy:
>>  	}
>>  	return retval;
>>  }
>> -EXPORT_SYMBOL_GPL(usb_add_hcd);
>>  
>>  /**
>> - * usb_remove_hcd - shutdown processing for generic HCDs
>> + * usb_otg_remove_hcd - shutdown processing for generic HCDs
>>   * @hcd: the usb_hcd structure to remove
>>   * Context: !in_interrupt()
>>   *
>>   * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
>>   * invoking the HCD's stop() method.
>>   */
>> -void usb_remove_hcd(struct usb_hcd *hcd)
>> +static void usb_otg_remove_hcd(struct usb_hcd *hcd)
>>  {
>>  	struct usb_device *rhdev = hcd->self.root_hub;
>>  
>> @@ -2923,6 +2923,51 @@ void usb_remove_hcd(struct usb_hcd *hcd)
>>  
>>  	usb_put_invalidate_rhdev(hcd);
>>  }
>> +
>> +static struct otg_hcd_ops otg_hcd_intf = {
>> +	.add = usb_otg_add_hcd,
>> +	.remove = usb_otg_remove_hcd,
>> +};
>> +
>> +/**
>> + * usb_add_hcd - finish generic HCD structure initialization and register
>> + * @hcd: the usb_hcd structure to initialize
>> + * @irqnum: Interrupt line to allocate
>> + * @irqflags: Interrupt type flags
>> + *
>> + * Finish the remaining parts of generic HCD initialization: allocate the
>> + * buffers of consistent memory, register the bus, request the IRQ line,
>> + * and call the driver's reset() and start() routines.
>> + * If it is an OTG device then it only registers the HCD with OTG core.
>> + *
>> + */
>> +int usb_add_hcd(struct usb_hcd *hcd,
>> +		unsigned int irqnum, unsigned long irqflags)
>> +{
>> +	/* If OTG device, OTG core takes care of adding HCD */
>> +	if (usb_otg_register_hcd(hcd, irqnum, irqflags, &otg_hcd_intf))
>> +		return usb_otg_add_hcd(hcd, irqnum, irqflags);
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(usb_add_hcd);
>> +
>> +/**
>> + * usb_remove_hcd - shutdown processing for generic HCDs
>> + * @hcd: the usb_hcd structure to remove
>> + * Context: !in_interrupt()
>> + *
>> + * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
>> + * invoking the HCD's stop() method.
>> + * If it is an OTG device then it unregisters the HCD from OTG core
>> + * as well.
>> + */
>> +void usb_remove_hcd(struct usb_hcd *hcd)
>> +{
>> +	/* If OTG device, OTG core takes care of stopping HCD */
>> +	if (usb_otg_unregister_hcd(hcd))
>> +		usb_otg_remove_hcd(hcd);
>> +}
>>  EXPORT_SYMBOL_GPL(usb_remove_hcd);
>>  
>>  void
>> -- 
>> 2.1.4
>>
> 
--
cheers,
-roger
--
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