/*
- * drivers/extcon/extcon_gpio.c
- *
- * Single-state GPIO extcon driver based on extcon class
+ * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
*
* Copyright (C) 2008 Google, Inc.
* Author: Mike Lockwood <lockwood@android.com>
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
-*/
+ */
#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>
struct gpio_extcon_data {
struct extcon_dev *edev;
- unsigned gpio;
- bool gpio_active_low;
- const char *state_on;
- const char *state_off;
int irq;
struct delayed_work work;
unsigned long debounce_jiffies;
- bool check_on_resume;
+
+ struct gpio_desc *id_gpiod;
+ struct gpio_extcon_pdata *pdata;
};
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->gpio);
- if (data->gpio_active_low)
+ state = gpiod_get_value_cansleep(data->id_gpiod);
+ if (data->pdata->gpio_active_low)
state = !state;
extcon_set_state(data->edev, state);
}
static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
{
- struct gpio_extcon_data *extcon_data = dev_id;
+ struct gpio_extcon_data *data = dev_id;
- queue_delayed_work(system_power_efficient_wq, &extcon_data->work,
- extcon_data->debounce_jiffies);
+ queue_delayed_work(system_power_efficient_wq, &data->work,
+ data->debounce_jiffies);
return IRQ_HANDLED;
}
-static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf)
+static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
{
- struct device *dev = edev->dev.parent;
- struct gpio_extcon_data *extcon_data = dev_get_drvdata(dev);
- const char *state;
-
- if (extcon_get_state(edev))
- state = extcon_data->state_on;
- else
- state = extcon_data->state_off;
-
- if (state)
- return sprintf(buf, "%s\n", state);
- return -EINVAL;
+ 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_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct gpio_extcon_data *extcon_data;
+ struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
+ struct gpio_extcon_data *data;
int ret;
if (!pdata)
return -EBUSY;
- if (!pdata->irq_flags) {
- dev_err(&pdev->dev, "IRQ flag is not specified.\n");
+ if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE)
return -EINVAL;
- }
- extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
+ data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
GFP_KERNEL);
- if (!extcon_data)
+ if (!data)
return -ENOMEM;
+ data->pdata = pdata;
- extcon_data->edev = devm_extcon_dev_allocate(&pdev->dev, NULL);
- if (IS_ERR(extcon_data->edev)) {
- dev_err(&pdev->dev, "failed to allocate extcon device\n");
- return -ENOMEM;
- }
- extcon_data->edev->name = pdata->name;
-
- extcon_data->gpio = pdata->gpio;
- extcon_data->gpio_active_low = pdata->gpio_active_low;
- extcon_data->state_on = pdata->state_on;
- extcon_data->state_off = pdata->state_off;
- extcon_data->check_on_resume = pdata->check_on_resume;
- if (pdata->state_on && pdata->state_off)
- extcon_data->edev->print_state = extcon_gpio_print_state;
-
- ret = devm_gpio_request_one(&pdev->dev, extcon_data->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(extcon_data->gpio,
- pdata->debounce * 1000);
- if (ret < 0)
- extcon_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, extcon_data->edev);
+ ret = devm_extcon_dev_register(&pdev->dev, data->edev);
if (ret < 0)
return ret;
- INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work);
-
- extcon_data->irq = gpio_to_irq(extcon_data->gpio);
- if (extcon_data->irq < 0)
- return extcon_data->irq;
+ INIT_DELAYED_WORK(&data->work, gpio_extcon_work);
- ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler,
- pdata->irq_flags, pdev->name,
- extcon_data);
+ /*
+ * 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);
if (ret < 0)
return ret;
- platform_set_drvdata(pdev, extcon_data);
+ platform_set_drvdata(pdev, data);
/* Perform initial detection */
- gpio_extcon_work(&extcon_data->work.work);
+ gpio_extcon_work(&data->work.work);
return 0;
}
static int gpio_extcon_remove(struct platform_device *pdev)
{
- struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev);
+ struct gpio_extcon_data *data = platform_get_drvdata(pdev);
- cancel_delayed_work_sync(&extcon_data->work);
- free_irq(extcon_data->irq, extcon_data);
+ cancel_delayed_work_sync(&data->work);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int gpio_extcon_resume(struct device *dev)
{
- struct gpio_extcon_data *extcon_data;
+ struct gpio_extcon_data *data;
- extcon_data = dev_get_drvdata(dev);
- if (extcon_data->check_on_resume)
+ data = dev_get_drvdata(dev);
+ if (data->pdata->check_on_resume)
queue_delayed_work(system_power_efficient_wq,
- &extcon_data->work, extcon_data->debounce_jiffies);
+ &data->work, data->debounce_jiffies);
return 0;
}
Code Review / kvmfornfv.git / blobdiff