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Message-ID: <57592BC7.6050502@ti.com>
Date: Thu, 9 Jun 2016 11:41:43 +0300
From: Roger Quadros <rogerq@...com>
To: Krzysztof Kozlowski <k.kozlowski@...sung.com>,
MyungJoo Ham <myungjoo.ham@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Kukjin Kim <kgene@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-samsung-soc@...r.kernel.org>
CC: Peter Chen <peter.chen@...escale.com>,
"Ivan T. Ivanov" <iivanov@...sol.com>,
Felipe Balbi <balbi@...nel.org>, <kishon@...com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RFC v4 4/7] extcon: usb-gpio: Add support for VBUS detection
Fixed Felipe's id.
On 09/06/16 11:38, 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@...sung.com>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>>
>> ---
>>
>> 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?
>
>> }
>>
>> static irqreturn_t usb_irq_handler(int irq, void *dev_id)
>> @@ -100,9 +113,11 @@ static int usb_extcon_probe(struct platform_device *pdev)
>> return -ENOMEM;
>>
>> info->dev = dev;
>> - info->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
>> - if (IS_ERR(info->id_gpiod)) {
>> - dev_err(dev, "failed to get ID GPIO\n");
>> + info->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", GPIOD_IN);
>> + info->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
>> + GPIOD_IN);
>> + if (!info->id_gpiod && !info->vbus_gpiod) {
>> + dev_err(dev, "failed to get GPIOs\n");
>> return PTR_ERR(info->id_gpiod);
>> }
>>
>> @@ -118,27 +133,54 @@ static int usb_extcon_probe(struct platform_device *pdev)
>> return ret;
>> }
>>
>> - ret = gpiod_set_debounce(info->id_gpiod,
>> - USB_GPIO_DEBOUNCE_MS * 1000);
>> + if (info->id_gpiod)
>> + ret = gpiod_set_debounce(info->id_gpiod,
>> + USB_GPIO_DEBOUNCE_MS * 1000);
>> + if (!ret && info->vbus_gpiod) {
>> + ret = gpiod_set_debounce(info->vbus_gpiod,
>> + USB_GPIO_DEBOUNCE_MS * 1000);
>> + if (ret < 0 && info->id_gpiod)
>> + gpiod_set_debounce(info->vbus_gpiod, 0);
>> + }
>> if (ret < 0)
>> info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS);
>>
>> INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable);
>>
>> - info->id_irq = gpiod_to_irq(info->id_gpiod);
>> - if (info->id_irq < 0) {
>> - dev_err(dev, "failed to get ID IRQ\n");
>> - return info->id_irq;
>> + if (info->id_gpiod) {
>> + info->id_irq = gpiod_to_irq(info->id_gpiod);
>> + if (info->id_irq < 0) {
>> + dev_err(dev, "failed to get ID IRQ\n");
>> + return info->id_irq;
>> + }
>> + ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
>> + usb_irq_handler,
>> + IRQF_TRIGGER_RISING |
>> + IRQF_TRIGGER_FALLING |
>> + IRQF_ONESHOT,
>> + pdev->name, info);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to request handler for ID IRQ\n");
>> + return ret;
>> + }
>> }
>>
>> - ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
>> - usb_irq_handler,
>> - IRQF_TRIGGER_RISING |
>> - IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
>> - pdev->name, info);
>> - if (ret < 0) {
>> - dev_err(dev, "failed to request handler for ID IRQ\n");
>> - return ret;
>> + if (info->vbus_gpiod) {
>> + info->vbus_irq = gpiod_to_irq(info->vbus_gpiod);
>> + if (info->vbus_irq < 0) {
>> + dev_err(dev, "failed to get VBUS IRQ\n");
>> + return info->vbus_irq;
>> + }
>> + ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL,
>> + usb_irq_handler,
>> + IRQF_TRIGGER_RISING |
>> + IRQF_TRIGGER_FALLING |
>> + IRQF_ONESHOT,
>> + pdev->name, info);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to request handler for VBUS IRQ\n");
>> + return ret;
>> + }
>> }
>>
>> platform_set_drvdata(pdev, info);
>> @@ -166,9 +208,16 @@ static int usb_extcon_suspend(struct device *dev)
>> int ret = 0;
>>
>> if (device_may_wakeup(dev)) {
>> - ret = enable_irq_wake(info->id_irq);
>> - if (ret)
>> - return ret;
>> + if (info->id_gpiod) {
>> + ret = enable_irq_wake(info->id_irq);
>> + if (ret)
>> + return ret;
>> + }
>> + if (info->vbus_gpiod) {
>> + ret = enable_irq_wake(info->vbus_irq);
>> + if (ret)
>> + goto err;
>> + }
>> }
>>
>> /*
>> @@ -176,8 +225,16 @@ static int usb_extcon_suspend(struct device *dev)
>> * as GPIOs used behind I2C subsystem might not be
>> * accessible until resume completes. So disable IRQ.
>> */
>> - disable_irq(info->id_irq);
>> + if (info->id_gpiod)
>> + disable_irq(info->id_irq);
>> + if (info->vbus_gpiod)
>> + disable_irq(info->vbus_irq);
>> +
>> + return ret;
>>
>> +err:
>> + if (info->id_gpiod)
>> + disable_irq_wake(info->id_irq);
>> return ret;
>> }
>>
>> @@ -187,17 +244,33 @@ static int usb_extcon_resume(struct device *dev)
>> int ret = 0;
>>
>> if (device_may_wakeup(dev)) {
>> - ret = disable_irq_wake(info->id_irq);
>> - if (ret)
>> - return ret;
>> + if (info->id_gpiod) {
>> + ret = disable_irq_wake(info->id_irq);
>> + if (ret)
>> + return ret;
>> + }
>> + if (info->vbus_gpiod) {
>> + ret = disable_irq_wake(info->vbus_irq);
>> + if (ret)
>> + goto err;
>> + }
>> }
>>
>> - enable_irq(info->id_irq);
>> + if (info->id_gpiod)
>> + enable_irq(info->id_irq);
>> + if (info->vbus_gpiod)
>> + enable_irq(info->vbus_irq);
>> +
>> if (!device_may_wakeup(dev))
>> queue_delayed_work(system_power_efficient_wq,
>> &info->wq_detcable, 0);
>>
>> return ret;
>> +
>> +err:
>> + if (info->id_gpiod)
>> + enable_irq_wake(info->id_irq);
>> + return ret;
>> }
>> #endif
>>
>>
>
> --
> cheers,
> -roger
>
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