[PATCH v3 12/15] input: gpio_keys_polled - Make use of device property API

Rafael J. Wysocki
2014-10-01T02:06:54Z

From: Aaron Lu <aaron.lu@intel.com>

Make use of device property API in this driver so that both OF based
system and ACPI based system can use this driver.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

Dmitry, does this look better than the previous one to you?

---
drivers/input/keyboard/gpio_keys_polled.c | 119 +++++++++++++-----------------
1 file changed, 52 insertions(+), 67 deletions(-)

Index: linux-pm/drivers/input/keyboard/gpio_keys_polled.c
===================================================================
--- linux-pm.orig/drivers/input/keyboard/gpio_keys_polled.c
+++ linux-pm/drivers/input/keyboard/gpio_keys_polled.c
@@ -25,9 +25,7 @@
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio_keys.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/of_gpio.h>
+#include <linux/property.h>

#define DRV_NAME "gpio-keys-polled"

@@ -102,21 +100,57 @@ static void gpio_keys_polled_close(struc
pdata->disable(bdev->dev);
}

-#ifdef CONFIG_OF
+static int gpio_keys_polled_get_button(struct device *dev, void *child,
+ void *data)
+{
+ struct gpio_keys_platform_data *pdata = data;
+ struct gpio_keys_button *button;
+ struct gpio_desc *desc;
+
+ desc = devm_get_named_gpiod_from_child(dev, child, "gpios", 0);
+ if (IS_ERR(desc)) {
+ int err = PTR_ERR(desc);
+
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get gpio flags, error: %d\n",
+ err);
+ return err;
+ }
+
+ button = &pdata->buttons[pdata->nbuttons++];
+ button->gpiod = desc;
+
+ if (device_child_property_read_u32(dev, child, "linux,code",
+ &button->code)) {
+ dev_err(dev, "Button without keycode: %d\n",
+ pdata->nbuttons - 1);
+ return -EINVAL;
+ }
+
+ device_child_property_read_string(dev, child, "label", &button->desc);
+
+ if (device_child_property_read_u32(dev, child, "linux,input-type",
+ &button->type))
+ button->type = EV_KEY;
+
+ button->wakeup = !device_get_child_property(dev, child,
+ "gpio-key,wakeup", NULL);
+
+ if (device_child_property_read_u32(dev, child, "debounce-interval",
+ &button->debounce_interval))
+ button->debounce_interval = 5;
+
+ return 0;
+}
+
static struct gpio_keys_platform_data *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);
+ nbuttons = device_get_child_node_count(dev);
if (nbuttons == 0)
return NULL;

@@ -126,54 +160,14 @@ static struct gpio_keys_platform_data *g
return ERR_PTR(-ENOMEM);

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);
+ pdata->rep = !device_get_property(dev, "autorepeat", NULL);
+ device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);

- i = 0;
- for_each_child_of_node(node, pp) {
- int gpio;
- enum of_gpio_flags flags;
-
- if (!of_find_property(pp, "gpios", NULL)) {
- pdata->nbuttons--;
- dev_warn(dev, "Found button without gpios\n");
- continue;
- }
-
- gpio = of_get_gpio_flags(pp, 0, &flags);
- if (gpio < 0) {
- error = gpio;
- if (error != -EPROBE_DEFER)
- dev_err(dev,
- "Failed to get gpio flags, error: %d\n",
- error);
- return ERR_PTR(error);
- }
-
- button = &pdata->buttons[i++];
-
- button->gpio = gpio;
- 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);
- return ERR_PTR(-EINVAL);
- }
-
- 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;
- }
+ error = device_for_each_child_node(dev, gpio_keys_polled_get_button,
+ pdata);
+ if (error)
+ return ERR_PTR(error);

if (pdata->nbuttons == 0)
return ERR_PTR(-EINVAL);
@@ -187,15 +181,6 @@ static const struct of_device_id gpio_ke
};
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 gpio_keys_polled_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -323,7 +308,7 @@ static struct platform_driver gpio_keys_
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
- .of_match_table = of_match_ptr(gpio_keys_polled_of_match),
+ .of_match_table = gpio_keys_polled_of_match,
},
};
module_platform_driver(gpio_keys_polled_driver);