Commit a2f25245 authored by Alexandre Pereira da Silva's avatar Alexandre Pereira da Silva Committed by Dmitry Torokhov

Input: gpio_keys_polled - convert to dt

Signed-off-by: default avatarAlexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 2976f247
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>;
};
...
......@@ -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 @@ static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
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);
......
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