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path: root/drivers/input/keyboard/gpio_keys_polled.c
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Diffstat (limited to 'drivers/input/keyboard/gpio_keys_polled.c')
-rw-r--r--drivers/input/keyboard/gpio_keys_polled.c147
1 files changed, 135 insertions, 12 deletions
diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index 20c8ab17221..f2142de789e 100644
--- 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"
@@ -38,7 +40,7 @@ struct gpio_keys_button_data {
struct gpio_keys_polled_dev {
struct input_polled_dev *poll_dev;
struct device *dev;
- struct gpio_keys_platform_data *pdata;
+ const struct gpio_keys_platform_data *pdata;
struct gpio_keys_button_data data[0];
};
@@ -67,11 +69,11 @@ static void gpio_keys_polled_check_state(struct input_dev *input,
static void gpio_keys_polled_poll(struct input_polled_dev *dev)
{
struct gpio_keys_polled_dev *bdev = dev->private;
- struct gpio_keys_platform_data *pdata = bdev->pdata;
+ const struct gpio_keys_platform_data *pdata = bdev->pdata;
struct input_dev *input = dev->input;
int i;
- for (i = 0; i < bdev->pdata->nbuttons; i++) {
+ for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button_data *bdata = &bdev->data[i];
if (bdata->count < bdata->threshold)
@@ -85,7 +87,7 @@ static void gpio_keys_polled_poll(struct input_polled_dev *dev)
static void gpio_keys_polled_open(struct input_polled_dev *dev)
{
struct gpio_keys_polled_dev *bdev = dev->private;
- struct gpio_keys_platform_data *pdata = bdev->pdata;
+ const struct gpio_keys_platform_data *pdata = bdev->pdata;
if (pdata->enable)
pdata->enable(bdev->dev);
@@ -94,31 +96,139 @@ static void gpio_keys_polled_open(struct input_polled_dev *dev)
static void gpio_keys_polled_close(struct input_polled_dev *dev)
{
struct gpio_keys_polled_dev *bdev = dev->private;
- struct gpio_keys_platform_data *pdata = bdev->pdata;
+ const struct gpio_keys_platform_data *pdata = bdev->pdata;
if (pdata->disable)
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->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 int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
{
- struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
+ const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
struct gpio_keys_polled_dev *bdev;
struct input_polled_dev *poll_dev;
struct input_dev *input;
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 +307,7 @@ 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;
@@ -209,15 +319,20 @@ 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;
}
static int __devexit gpio_keys_polled_remove(struct platform_device *pdev)
{
struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev);
- struct gpio_keys_platform_data *pdata = bdev->pdata;
+ const struct gpio_keys_platform_data *pdata = bdev->pdata;
int i;
input_unregister_polled_device(bdev->poll_dev);
@@ -227,6 +342,13 @@ 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 +361,7 @@ 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);