diff options
Diffstat (limited to 'drivers/extcon')
| -rw-r--r-- | drivers/extcon/extcon-gpio.c | 62 |
1 files changed, 43 insertions, 19 deletions
diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c index 27de6aee890f..279ff8f6637d 100644 --- a/drivers/extcon/extcon-gpio.c +++ b/drivers/extcon/extcon-gpio.c @@ -20,6 +20,7 @@ #include <linux/extcon.h> #include <linux/extcon/extcon-gpio.h> #include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.h> @@ -34,6 +35,7 @@ struct gpio_extcon_data { struct delayed_work work; unsigned long debounce_jiffies; + struct gpio_desc *id_gpiod; struct gpio_extcon_pdata *pdata; }; @@ -44,7 +46,7 @@ static void gpio_extcon_work(struct work_struct *work) container_of(to_delayed_work(work), struct gpio_extcon_data, work); - state = gpio_get_value(data->pdata->gpio); + state = gpiod_get_value_cansleep(data->id_gpiod); if (data->pdata->gpio_active_low) state = !state; extcon_set_state(data->edev, state); @@ -59,6 +61,35 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data) +{ + struct gpio_extcon_pdata *pdata = data->pdata; + int ret; + + ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN, + dev_name(dev)); + if (ret < 0) + return ret; + + data->id_gpiod = gpio_to_desc(pdata->gpio); + if (!data->id_gpiod) + return -EINVAL; + + if (pdata->debounce) { + ret = gpiod_set_debounce(data->id_gpiod, + pdata->debounce * 1000); + if (ret < 0) + data->debounce_jiffies = + msecs_to_jiffies(pdata->debounce); + } + + data->irq = gpiod_to_irq(data->id_gpiod); + if (data->irq < 0) + return data->irq; + + return 0; +} + static int gpio_extcon_probe(struct platform_device *pdev) { struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev); @@ -74,25 +105,18 @@ static int gpio_extcon_probe(struct platform_device *pdev) GFP_KERNEL); if (!data) return -ENOMEM; - - data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id); - if (IS_ERR(data->edev)) { - dev_err(&pdev->dev, "failed to allocate extcon device\n"); - return -ENOMEM; - } data->pdata = pdata; - ret = devm_gpio_request_one(&pdev->dev, data->pdata->gpio, GPIOF_DIR_IN, - pdev->name); + /* Initialize the gpio */ + ret = gpio_extcon_init(&pdev->dev, data); if (ret < 0) return ret; - if (pdata->debounce) { - ret = gpio_set_debounce(data->pdata->gpio, - pdata->debounce * 1000); - if (ret < 0) - data->debounce_jiffies = - msecs_to_jiffies(pdata->debounce); + /* Allocate the memory of extcon devie and register extcon device */ + data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id); + if (IS_ERR(data->edev)) { + dev_err(&pdev->dev, "failed to allocate extcon device\n"); + return -ENOMEM; } ret = devm_extcon_dev_register(&pdev->dev, data->edev); @@ -101,10 +125,10 @@ static int gpio_extcon_probe(struct platform_device *pdev) INIT_DELAYED_WORK(&data->work, gpio_extcon_work); - data->irq = gpio_to_irq(data->pdata->gpio); - if (data->irq < 0) - return data->irq; - + /* + * Request the interrput of gpio to detect whether external connector + * is attached or detached. + */ ret = devm_request_any_context_irq(&pdev->dev, data->irq, gpio_irq_handler, pdata->irq_flags, pdev->name, data); |