On Wed, 30 Dec 2015, Chanwoo Choi wrote:
> From: Felipe Balbi <balbi@xxxxxx>
>
> This patch support for VBUS detection by using GPIO pin.
>
> Signed-off-by: Felipe Balbi <balbi@xxxxxx>
> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
> ---
> drivers/extcon/extcon-palmas.c | 50 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/palmas.h | 3 +++
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
> 2 files changed, 53 insertions(+)
>
> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
> index 93c30a885740..885ee95a6a7b 100644
> --- a/drivers/extcon/extcon-palmas.c
> +++ b/drivers/extcon/extcon-palmas.c
> @@ -216,11 +216,23 @@ static int palmas_usb_probe(struct platform_device *pdev)
> return PTR_ERR(palmas_usb->id_gpiod);
> }
>
> + palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
> + GPIOD_IN);
> + if (IS_ERR(palmas_usb->vbus_gpiod)) {
> + dev_err(&pdev->dev, "failed to get vbus gpio\n");
> + return PTR_ERR(palmas_usb->vbus_gpiod);
> + }
> +
> if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
> palmas_usb->enable_id_detection = false;
> palmas_usb->enable_gpio_id_detection = true;
> }
>
> + if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
> + palmas_usb->enable_vbus_detection = false;
> + palmas_usb->enable_gpio_vbus_detection = true;
> + }
> +
> if (palmas_usb->enable_gpio_id_detection) {
> u32 debounce;
>
> @@ -311,6 +323,40 @@ static int palmas_usb_probe(struct platform_device *pdev)
> palmas_usb->vbus_irq, status);
> return status;
> }
> + } else if (palmas_usb->enable_gpio_vbus_detection) {
> + /* remux GPIO_1 as VBUSDET */
> + status = palmas_update_bits(palmas,
> + PALMAS_PU_PD_OD_BASE,
> + PALMAS_PRIMARY_SECONDARY_PAD1,
> + PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
> + (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
> + if (status < 0) {
> + dev_err(&pdev->dev, "can't remux GPIO1\n");
> + return status;
> + }
> +
> + palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
> + PALMAS_VBUS_OTG_IRQ);
> + palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
> + if (palmas_usb->gpio_vbus_irq < 0) {
> + dev_err(&pdev->dev, "failed to get vbus irq\n");
> + return palmas_usb->gpio_vbus_irq;
> + }
> + status = devm_request_threaded_irq(&pdev->dev,
> + palmas_usb->gpio_vbus_irq,
> + NULL,
> + palmas_vbus_irq_handler,
> + IRQF_TRIGGER_FALLING |
> + IRQF_TRIGGER_RISING |
> + IRQF_ONESHOT |
> + IRQF_EARLY_RESUME,
> + "palmas_usb_vbus",
> + palmas_usb);
> + if (status < 0) {
> + dev_err(&pdev->dev,
> + "failed to request handler for vbus irq\n");
> + return status;
> + }
> }
>
> palmas_enable_irq(palmas_usb);
> @@ -337,6 +383,8 @@ static int palmas_usb_suspend(struct device *dev)
> if (device_may_wakeup(dev)) {
> if (palmas_usb->enable_vbus_detection)
> enable_irq_wake(palmas_usb->vbus_irq);
> + if (palmas_usb->enable_gpio_vbus_detection)
> + enable_irq_wake(palmas_usb->gpio_vbus_irq);
> if (palmas_usb->enable_id_detection)
> enable_irq_wake(palmas_usb->id_irq);
> if (palmas_usb->enable_gpio_id_detection)
> @@ -352,6 +400,8 @@ static int palmas_usb_resume(struct device *dev)
> if (device_may_wakeup(dev)) {
> if (palmas_usb->enable_vbus_detection)
> disable_irq_wake(palmas_usb->vbus_irq);
> + if (palmas_usb->enable_gpio_vbus_detection)
> + disable_irq_wake(palmas_usb->gpio_vbus_irq);
> if (palmas_usb->enable_id_detection)
> disable_irq_wake(palmas_usb->id_irq);
> if (palmas_usb->enable_gpio_id_detection)
> diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
> index 13e1d96935ed..7b2526f7bc9b 100644
> --- a/include/linux/mfd/palmas.h
> +++ b/include/linux/mfd/palmas.h
> @@ -553,7 +553,9 @@ struct palmas_usb {
> int vbus_irq;
>
> int gpio_id_irq;
> + int gpio_vbus_irq;
> struct gpio_desc *id_gpiod;
> + struct gpio_desc *vbus_gpiod;
> unsigned long sw_debounce_jiffies;
> struct delayed_work wq_detectid;
>
> @@ -562,6 +564,7 @@ struct palmas_usb {
> bool enable_vbus_detection;
> bool enable_id_detection;
> bool enable_gpio_id_detection;
> + bool enable_gpio_vbus_detection;
> };
>
> #define comparator_to_palmas(x) container_of((x), struct palmas_usb, comparator)
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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