On 06/09/2016 10:38 AM, Roger Quadros wrote:
> Hi,
>
> On 08/06/16 16:48, Krzysztof Kozlowski wrote:
>> Add VBUS pin detection support to extcon-usb-gpio driver for boards
>> which have both VBUS and ID pins, or only one of them.
>>
>> The logic behind reporting USB and USB-HOST extcon cables is not
>> affected. The driver however will report extcon changes for USB-VBUS and
>> USB-ID.
>>
>> Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
>>
>> ---
>>
>> Some parts base on old Robert's patchset.
>> ---
>> drivers/extcon/extcon-usb-gpio.c | 125 +++++++++++++++++++++++++++++++--------
>> 1 file changed, 99 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
>> index a36aab007022..85b8a0ce5731 100644
>> --- a/drivers/extcon/extcon-usb-gpio.c
>> +++ b/drivers/extcon/extcon-usb-gpio.c
>> @@ -35,7 +35,9 @@ struct usb_extcon_info {
>> struct extcon_dev *edev;
>>
>> struct gpio_desc *id_gpiod;
>> + struct gpio_desc *vbus_gpiod;
>> int id_irq;
>> + int vbus_irq;
>>
>> unsigned long debounce_jiffies;
>> struct delayed_work wq_detcable;
>> @@ -44,6 +46,8 @@ struct usb_extcon_info {
>> static const unsigned int usb_extcon_cable[] = {
>> EXTCON_USB,
>> EXTCON_USB_HOST,
>> + EXTCON_USB_ID,
>> + EXTCON_USB_VBUS,
>> EXTCON_NONE,
>> };
>>
>> @@ -55,7 +59,8 @@ static void usb_extcon_detect_cable(struct work_struct *work)
>> wq_detcable);
>>
>> /* check ID and update cable state */
>> - id = gpiod_get_value_cansleep(info->id_gpiod);
>> + id = info->id_gpiod ? gpiod_get_value_cansleep(info->id_gpiod) : 1;
>> +
>> if (id) {
>> /*
>> * ID = 1 means USB HOST cable detached.
>> @@ -73,6 +78,14 @@ static void usb_extcon_detect_cable(struct work_struct *work)
>> extcon_set_cable_state_(info->edev, EXTCON_USB, false);
>> extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, true);
>> }
>> +
>> + if (info->id_gpiod)
>> + extcon_set_cable_state_(info->edev, EXTCON_USB_ID, id);
>> + if (info->vbus_gpiod) {
>> + int vbus = gpiod_get_value_cansleep(info->vbus_gpiod);
>> +
>> + extcon_set_cable_state_(info->edev, EXTCON_USB_VBUS, vbus);
>> + }
>
> What happens if either id_gpiod or vbus_gpiod is present?
>
> As per the DT binding document
> "In general we have three cases:
> 1. If VBUS and ID gpios are present we pass them as is
> USB-HOST = !ID, USB = VBUS
> 2. If only VBUS gpio is present we assume that ID pin is always High.
> USB-HOST = false, USB = VBUS.
> 3. If only ID pin is available we infer the VBUS pin states based on ID.
> USB-HOST = !ID, USB = ID"
>
> So do you want to be consistent and infer VBUS and ID states based on the other?
Right, I couldn't make up my mind whether I want to change/improve
existing logic or just add VBUS/ID raw notifying. Finally I left
original code for USB/USB-HOST cables alone.
Best regards,
Krzysztof
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