linux-kernel - Re: [PATCH] extcon: palmas: Handle ID interrupt properly using USB_ID_INT

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Message-id: <5265B0C7.7040808@samsung.com>
Date:	Tue, 22 Oct 2013 07:55:03 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	George Cherian <george.cherian@...com>
Cc:	myungjoo.ham@...sung.com, kishon@...com, ldewangan@...dia.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] extcon: palmas: Handle ID interrupt properly using
 USB_ID_INT_SRC

Hi George,

On 10/15/2013 01:40 PM, George Cherian wrote:
> Laxman/Chanwoo/Kishon,
> 
> Any comments on this!!
> Regards
> -George
> On 10/11/2013 12:18 AM, George Cherian wrote:
>> Always cross check with the ID state and the source of interrupt.
>> Also add a case in which ID Source is ID_GND but LATCH state is set
>> wrongly. This uses the previous Link stat to determine the new state.
>>
>> Signed-off-by: George Cherian <george.cherian@...com>
>> ---
>>   drivers/extcon/extcon-palmas.c | 15 ++++++++++++---
>>   1 file changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
>> index 6e83e9a..2aea4bc 100644
>> --- a/drivers/extcon/extcon-palmas.c
>> +++ b/drivers/extcon/extcon-palmas.c
>> @@ -78,20 +78,24 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
>>     static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
>>   {
>> -    unsigned int set;
>> +    unsigned int set, id_src;
>>       struct palmas_usb *palmas_usb = _palmas_usb;
>>         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
>>           PALMAS_USB_ID_INT_LATCH_SET, &set);
>> +    palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
>> +        PALMAS_USB_ID_INT_SRC, &id_src);
>>   -    if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
>> +    if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
>> +                (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
>>           palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
>>               PALMAS_USB_ID_INT_LATCH_CLR,
>>               PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
>>           palmas_usb->linkstat = PALMAS_USB_STATE_ID;
>>           extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
>>           dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
>> -    } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
>> +    } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
>> +                (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
>>           palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
>>               PALMAS_USB_ID_INT_LATCH_CLR,
>>               PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
>> @@ -103,6 +107,11 @@ static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
>>           palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
>>           extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
>>           dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
>> +    } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
>> +                (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
>> +        palmas_usb->linkstat = PALMAS_USB_STATE_ID;
>> +        extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
>> +        dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
>>       }
>>         return IRQ_HANDLED;
> 
> 

Applied it on next branch.

Thanks.
Chanwoo Choi
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