generic: update gpio_buttons driver

SVN-Revision: 23984

target/linux/generic/files/drivers/input/misc/gpio_buttons.c

@@ -20,23 +20,19 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
-
 #include <linux/input.h>
 #include <linux/input-polldev.h>
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
-
+#include <linux/gpio.h>
 #include <linux/gpio_buttons.h>
 
-#include <asm/gpio.h>
-
 #define DRV_NAME	"gpio-buttons"
-#define DRV_VERSION	"0.1.2"
-#define PFX		DRV_NAME ": "
 
 struct gpio_button_data {
 	int last_state;
 	int count;
+	int can_sleep;
 };
 
 struct gpio_buttons_dev {
@@ -45,6 +41,28 @@ struct gpio_buttons_dev {
 	struct gpio_button_data *data;
 };
 
+static void gpio_buttons_check_state(struct input_dev *input,
+				      struct gpio_button *button,
+				      struct gpio_button_data *bdata)
+{
+	int state;
+
+	if (bdata->can_sleep)
+		state = !!gpio_get_value_cansleep(button->gpio);
+	else
+		state = !!gpio_get_value(button->gpio);
+
+	if (state != bdata->last_state) {
+		unsigned int type = button->type ?: EV_KEY;
+
+		input_event(input, type, button->code,
+			    !!(state ^ button->active_low));
+		input_sync(input);
+		bdata->count = 0;
+		bdata->last_state = state;
+	}
+}
+
 static void gpio_buttons_poll(struct input_polled_dev *dev)
 {
 	struct gpio_buttons_dev *bdev = dev->private;
@@ -54,41 +72,34 @@ static void gpio_buttons_poll(struct input_polled_dev *dev)
 
 	for (i = 0; i < bdev->pdata->nbuttons; i++) {
 		struct gpio_button *button = &pdata->buttons[i];
-		unsigned int type = button->type ?: EV_KEY;
-		int state;
+		struct gpio_button_data *bdata = &bdev->data[i];
 
-		if (bdev->data[i].count < button->threshold) {
-			bdev->data[i].count++;
-			continue;
-		}
+		if (bdata->count < button->threshold)
+			bdata->count++;
+		else
+			gpio_buttons_check_state(input, button, bdata);
 
-		state = gpio_get_value(button->gpio) ? 1 : 0;
-		if (state != bdev->data[i].last_state) {
-			input_event(input, type, button->code,
-				    !!(state ^ button->active_low));
-			input_sync(input);
-			bdev->data[i].count = 0;
-			bdev->data[i].last_state = state;
-		}
 	}
 }
 
 static int __devinit gpio_buttons_probe(struct platform_device *pdev)
 {
 	struct gpio_buttons_platform_data *pdata = pdev->dev.platform_data;
+	struct device *dev = &pdev->dev;
 	struct gpio_buttons_dev *bdev;
 	struct input_polled_dev *poll_dev;
 	struct input_dev *input;
-	int error, i;
+	int error;
+	int i;
 
 	if (!pdata)
 		return -ENXIO;
 
 	bdev = kzalloc(sizeof(struct gpio_buttons_dev) +
-		       sizeof(struct gpio_button_data) * pdata->nbuttons,
+		       pdata->nbuttons * sizeof(struct gpio_button_data),
 		       GFP_KERNEL);
 	if (!bdev) {
-		printk(KERN_ERR DRV_NAME "no memory for device\n");
+		dev_err(dev, "no memory for private data\n");
 		return -ENOMEM;
 	}
 
@@ -96,7 +107,7 @@ static int __devinit gpio_buttons_probe(struct platform_device *pdev)
 
 	poll_dev = input_allocate_polled_device();
 	if (!poll_dev) {
-		printk(KERN_ERR DRV_NAME "no memory for polled device\n");
+		dev_err(dev, "no memory for polled device\n");
 		error = -ENOMEM;
 		goto err_free_bdev;
 	}
@@ -122,23 +133,26 @@ static int __devinit gpio_buttons_probe(struct platform_device *pdev)
 		unsigned int gpio = button->gpio;
 		unsigned int type = button->type ?: EV_KEY;
 
-		error = gpio_request(gpio, button->desc ?
-				button->desc : DRV_NAME);
+		error = gpio_request(gpio,
+				     button->desc ? button->desc : DRV_NAME);
 		if (error) {
-			printk(KERN_ERR PFX "unable to claim gpio %u, "
-				"error %d\n", gpio, error);
+			dev_err(dev, "unable to claim gpio %u, err=%d\n",
+				gpio, error);
 			goto err_free_gpio;
 		}
 
 		error = gpio_direction_input(gpio);
 		if (error) {
-			printk(KERN_ERR PFX "unable to set direction on "
-				"gpio %u, error %d\n", gpio, error);
+			dev_err(dev,
+				"unable to set direction on gpio %u, err=%d\n",
+				gpio, error);
 			goto err_free_gpio;
 		}
 
+		bdev->data[i].can_sleep = gpio_cansleep(gpio);
+		bdev->data[i].last_state = -1;
+
 		input_set_capability(input, type, button->code);
-		bdev->data[i].last_state = gpio_get_value(button->gpio) ? 1 : 0;
 	}
 
 	bdev->poll_dev = poll_dev;
@@ -147,11 +161,16 @@ static int __devinit gpio_buttons_probe(struct platform_device *pdev)
 
 	error = input_register_polled_device(poll_dev);
 	if (error) {
-		printk(KERN_ERR PFX "unable to register polled device, "
-			"error %d\n", error);
+		dev_err(dev, "unable to register polled device, err=%d\n",
+			error);
 		goto err_free_gpio;
 	}
 
+	/* report initial state of the buttons */
+	for (i = 0; i < pdata->nbuttons; i++)
+		gpio_buttons_check_state(input, &pdata->buttons[i],
+					 &bdev->data[i]);
+
 	return 0;
 
 err_free_gpio:
@@ -197,7 +216,6 @@ static struct platform_driver gpio_buttons_driver = {
 
 static int __init gpio_buttons_init(void)
 {
-	printk(KERN_INFO DRV_NAME " driver version " DRV_VERSION "\n");
 	return platform_driver_register(&gpio_buttons_driver);
 }
 
@@ -209,8 +227,6 @@ static void __exit gpio_buttons_exit(void)
 module_init(gpio_buttons_init);
 module_exit(gpio_buttons_exit);
 
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
-MODULE_VERSION(DRV_VERSION);
-MODULE_DESCRIPTION("Polled buttons driver for CPU GPIOs");
-
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_DESCRIPTION("Polled GPIO Buttons driver");