Input: gpio_keys_polled - convert to dt

Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/gpio-keys-polled.txt b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
new file mode 100644 (file)
index 0000000..313abef
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
@@ -0,0 +1,38 @@
+Device-Tree bindings for input/gpio_keys_polled.c keyboard driver
+
+Required properties:
+       - compatible = "gpio-keys-polled";
+       - poll-interval: Poll interval time in milliseconds
+
+Optional properties:
+       - autorepeat: Boolean, Enable auto repeat feature of Linux input
+         subsystem.
+
+Each button (key) is represented as a sub-node of "gpio-keys-polled":
+Subnode properties:
+
+       - gpios: OF device-tree gpio specification.
+       - label: Descriptive name of the key.
+       - linux,code: Keycode to emit.
+
+Optional subnode-properties:
+       - linux,input-type: Specify event type this button/key generates.
+         If not specified defaults to <1> == EV_KEY.
+       - debounce-interval: Debouncing interval time in milliseconds.
+         If not specified defaults to 5.
+       - gpio-key,wakeup: Boolean, button can wake-up the system.
+
+Example nodes:
+
+       gpio_keys_polled {
+                       compatible = "gpio-keys-polled";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       poll-interval = <100>;
+                       autorepeat;
+                       button@21 {
+                               label = "GPIO Key UP";
+                               linux,code = <103>;
+                               gpios = <&gpio1 0 1>;
+                       };
+                       ...

diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index 2619297..7908952 100644 (file)
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c
@@ -25,6 +25,8 @@
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/gpio_keys.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
 
 #define DRV_NAME       "gpio-keys-polled"
 
@@ -100,6 +102,99 @@ static void gpio_keys_polled_close(struct input_polled_dev *dev)
                pdata->disable(bdev->dev);
 }
 
+#ifdef CONFIG_OF
+static struct gpio_keys_platform_data * __devinit
+gpio_keys_polled_get_devtree_pdata(struct device *dev)
+{
+       struct device_node *node, *pp;
+       struct gpio_keys_platform_data *pdata;
+       struct gpio_keys_button *button;
+       int error;
+       int nbuttons;
+       int i;
+
+       node = dev->of_node;
+       if (!node)
+               return NULL;
+
+       nbuttons = of_get_child_count(node);
+       if (nbuttons == 0)
+               return NULL;
+
+       pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
+                       GFP_KERNEL);
+       if (!pdata) {
+               error = -ENOMEM;
+               goto err_out;
+       }
+
+       pdata->buttons = (struct gpio_keys_button *)(pdata + 1);
+
+       pdata->rep = !!of_get_property(node, "autorepeat", NULL);
+       of_property_read_u32(node, "poll-interval", &pdata->poll_interval);
+
+       i = 0;
+       for_each_child_of_node(node, pp) {
+               enum of_gpio_flags flags;
+
+               if (!of_find_property(pp, "gpios", NULL)) {
+                       pdata->nbuttons--;
+                       dev_warn(dev, "Found button without gpios\n");
+                       continue;
+               }
+
+               button = &pdata->buttons[i++];
+
+               button->gpio = of_get_gpio_flags(pp, 0, &flags);
+               button->active_low = flags & OF_GPIO_ACTIVE_LOW;
+
+               if (of_property_read_u32(pp, "linux,code", &button->code)) {
+                       dev_err(dev, "Button without keycode: 0x%x\n",
+                               button->gpio);
+                       error = -EINVAL;
+                       goto err_free_pdata;
+               }
+
+               button->desc = of_get_property(pp, "label", NULL);
+
+               if (of_property_read_u32(pp, "linux,input-type", &button->type))
+                       button->type = EV_KEY;
+
+               button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
+
+               if (of_property_read_u32(pp, "debounce-interval",
+                                        &button->debounce_interval))
+                       button->debounce_interval = 5;
+       }
+
+       if (pdata->nbuttons == 0) {
+               error = -EINVAL;
+               goto err_free_pdata;
+       }
+
+       return pdata;
+
+err_free_pdata:
+       kfree(pdata);
+err_out:
+       return ERR_PTR(error);
+}
+
+static struct of_device_id gpio_keys_polled_of_match[] = {
+       { .compatible = "gpio-keys-polled", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
+
+#else
+
+static inline struct gpio_keys_platform_data *
+gpio_keys_polled_get_devtree_pdata(struct device *dev)
+{
+       return NULL;
+}
+#endif
+
 static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
@@ -110,15 +205,29 @@ static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
        int error;
        int i;
 
-       if (!pdata || !pdata->poll_interval)
-               return -EINVAL;
+       if (!pdata) {
+               pdata = gpio_keys_polled_get_devtree_pdata(dev);
+               if (IS_ERR(pdata))
+                       return PTR_ERR(pdata);
+               if (!pdata) {
+                       dev_err(dev, "missing platform data\n");
+                       return -EINVAL;
+               }
+       }
+
+       if (!pdata->poll_interval) {
+               dev_err(dev, "missing poll_interval value\n");
+               error = -EINVAL;
+               goto err_free_pdata;
+       }
 
        bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
                       pdata->nbuttons * sizeof(struct gpio_keys_button_data),
                       GFP_KERNEL);
        if (!bdev) {
                dev_err(dev, "no memory for private data\n");
-               return -ENOMEM;
+               error = -ENOMEM;
+               goto err_free_pdata;
        }
 
        poll_dev = input_allocate_polled_device();
@@ -197,7 +306,7 @@ static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
        /* report initial state of the buttons */
        for (i = 0; i < pdata->nbuttons; i++)
                gpio_keys_polled_check_state(input, &pdata->buttons[i],
-                                        &bdev->data[i]);
+                                            &bdev->data[i]);
 
        return 0;
 
@@ -209,8 +318,13 @@ err_free_gpio:
 
 err_free_bdev:
        kfree(bdev);
-
        platform_set_drvdata(pdev, NULL);
+
+err_free_pdata:
+       /* If we have no platform_data, we allocated pdata dynamically.  */
+       if (!dev_get_platdata(&pdev->dev))
+               kfree(pdata);
+
        return error;
 }
 
@@ -227,6 +341,13 @@ static int __devexit gpio_keys_polled_remove(struct platform_device *pdev)
 
        input_free_polled_device(bdev->poll_dev);
 
+       /*
+        * If we had no platform_data, we allocated pdata dynamically and
+        * must free it here.
+        */
+       if (!dev_get_platdata(&pdev->dev))
+               kfree(pdata);
+
        kfree(bdev);
        platform_set_drvdata(pdev, NULL);
 
@@ -239,6 +360,7 @@ static struct platform_driver gpio_keys_polled_driver = {
        .driver = {
                .name   = DRV_NAME,
                .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(gpio_keys_polled_of_match),
        },
 };
 module_platform_driver(gpio_keys_polled_driver);