[v2,1/3] extcon: palmas: Add the support for VBUS detection by using GPIO
diff mbox

Message ID 1451436947-22163-2-git-send-email-cw00.choi@samsung.com
State New
Headers show

Commit Message

Chanwoo Choi Dec. 30, 2015, 12:55 a.m. UTC
From: Felipe Balbi <balbi@ti.com>

This patch support for VBUS detection by using GPIO pin.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
 drivers/extcon/extcon-palmas.c | 50 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/palmas.h     |  3 +++
 2 files changed, 53 insertions(+)

Comments

Lee Jones Jan. 11, 2016, 5:49 a.m. UTC | #1
On Wed, 30 Dec 2015, Chanwoo Choi wrote:

> From: Felipe Balbi <balbi@ti.com>
> 
> This patch support for VBUS detection by using GPIO pin.
> 
> Signed-off-by: Felipe Balbi <balbi@ti.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
> ---
>  drivers/extcon/extcon-palmas.c | 50 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/palmas.h     |  3 +++

Acked-by: Lee Jones <lee.jones@linaro.org>

>  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)

Patch
diff mbox

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)