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[gpio-button-hotplug] add OF binding

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34834 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
blogic 2012-12-21 20:03:49 +00:00
parent b05c7e7166
commit 75a9d0e41b
1 changed files with 117 additions and 3 deletions
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118
package/system/gpio-button-hotplug/src/gpio-button-hotplug.c
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@ -24,7 +24,7 @@
#include <linux/kobject.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/gpio_keys.h>
#define DRV_NAME "gpio-keys-polled"
@ -90,6 +90,7 @@ static struct bh_map button_map[] = {
BH_MAP(BTN_8, "BTN_8"),
BH_MAP(BTN_9, "BTN_9"),
BH_MAP(KEY_RESTART, "reset"),
BH_MAP(KEY_RFKILL, "rfkill"),
#ifdef KEY_WPS_BUTTON
BH_MAP(KEY_WPS_BUTTON, "wps"),
#endif /* KEY_WPS_BUTTON */
@ -322,6 +323,100 @@ static void __devinit gpio_keys_polled_open(struct gpio_keys_polled_dev *bdev)
gpio_keys_polled_queue_work(bdev);
}
#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->nbuttons = nbuttons;
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 void __devexit gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev)
{
struct gpio_keys_platform_data *pdata = bdev->pdata;
@ -340,8 +435,21 @@ static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
int error;
int i;
if (!pdata || !pdata->poll_interval)
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),
@ -401,6 +509,11 @@ err_free_gpio:
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;
}
@ -427,6 +540,7 @@ 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),
},
};