Signed-off-by: David Jander <david@xxxxxxxxxxx>
---
.../devicetree/bindings/gpio/gpio_keys.txt | 49 ++++++++
drivers/input/keyboard/gpio_keys.c | 130 ++++++++++++++++++++
2 files changed, 179 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio_keys.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio_keys.txt b/Documentation/devicetree/bindings/gpio/gpio_keys.txt
new file mode 100644
index 0000000..147b61d
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio_keys.txt
@@ -0,0 +1,49 @@
+Device-Tree bindings for input/gpio_keys.c keyboard driver
+
+Required properties:
+ - compatible = "gpio-keys";
+
+Optional properties:
+ - autorepeat: Boolean, Enable auto repeat feature of Linux input
+ subsystem.
+
+Each button (key) is represented as a sub-node of "gpio-keys":
+Subnode properties:
+
+ - reg: GPIO number the key is bound to.
+ - label: Descriptive name of the key.
+ - linux,code: Keycode to emit.
+
+Optional subnode-properties:
+ - active_low: Boolean flag to specify active-low GPIO input.
+ - linux,input_type: Specify event type this button/key generates.
+ Default if unspecified is <1> == EV_KEY.
+ - debounce-interval: Debouncing interval time in milliseconds.
+ Default if unspecified is 5.
+ - linux,can-disable: Boolean, specify if key can be disabled via
+ module parameter.
+ - wakeup: Boolean, button can wake-up the system.
+
+Example nodes:
+
+ gpio_keys {
+ compatible = "gpio-keys";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ autorepeat;
+ button@20 {
+ label = "GPIO Key ESC";
+ linux,code = <1>;
+ reg = <0x20>;
+ active_low;
+ linux,input_type = <1>;
+ };
+ button@21 {
+ label = "GPIO Key UP";
+ linux,code = <103>;
+ reg = <0x21>;
+ active_low;
+ linux,input_type = <1>;
+ };
+ ...
+
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 987498e..4539b0b 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -3,6 +3,9 @@
*
* Copyright 2005 Phil Blundell
*
+ * Added OF support:
+ * Copyright 2010 David Jander <david@xxxxxxxxxxx>
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
@@ -25,6 +28,8 @@
#include <linux/gpio_keys.h>
#include <linux/workqueue.h>
#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
struct gpio_button_data {
struct gpio_keys_button *button;
@@ -42,6 +47,7 @@ struct gpio_keys_drvdata {
int (*enable)(struct device *dev);
void (*disable)(struct device *dev);
struct gpio_button_data data[0];
+ struct gpio_keys_platform_data *dyn_pdata;
};
/*
@@ -442,18 +448,131 @@ static void gpio_keys_close(struct input_dev *input)
ddata->disable(input->dev.parent);
}
+/*
+ * Handlers for alternative sources of platform_data
+ */
+#ifdef CONFIG_OF
+/*
+ * Translate OpenFirmware node properties into platform_data
+ */
+static struct gpio_keys_platform_data *
+gpio_keys_get_devtree_pdata(struct device *dev)
+{
+ struct gpio_keys_platform_data *pdata;
+ struct device_node *node, *pp;
+ int i;
+ struct gpio_keys_button *buttons;
+ const u32 *reg;
+ int len;
+
+ node = dev->of_node;
+ if (node == NULL)
+ return NULL;
+
+ pdata = kzalloc(sizeof(struct gpio_keys_platform_data), GFP_KERNEL);
+ if (pdata == NULL) {
+ dev_err(dev, "Unable to allocate platform_data\n");
+ return NULL;
+ }
+
+ pdata->rep = !!of_get_property(node, "autorepeat", &len);
+
+ /* First count the subnodes */
+ pdata->nbuttons = 0;
+ pp = NULL;
+ while ((pp = of_get_next_child(node, pp)))
+ pdata->nbuttons++;
+
+ if (pdata->nbuttons == 0)
+ return NULL;
+
+ buttons = kzalloc(pdata->nbuttons * sizeof(*buttons), GFP_KERNEL);
+ if (!buttons)
+ return NULL;
+
+ pp = NULL;
+ i = 0;
+ while ((pp = of_get_next_child(node, pp))) {
+ const char *lbl;
+
+ reg = of_get_property(pp, "reg", &len);
+ if (!reg) {
+ pdata->nbuttons--;
+ printk("Found button without reg\n");
+ continue;
+ }
+ buttons[i].gpio = be32_to_cpup(reg);
+
+ reg = of_get_property(pp, "linux,code", &len);
+ if (!reg) {
+ dev_err(dev, "Button without keycode: 0x%x\n", buttons[i].gpio);
+ return NULL;
+ }
+ buttons[i].code = be32_to_cpup(reg);
+
+ lbl = of_get_property(pp, "label", &len);
+ buttons[i].desc = (char *)lbl;
+
+ buttons[i].active_low = !!of_get_property(pp, "active_low", NULL);
+
+ reg = of_get_property(pp, "linux,input_type", &len);
+ if (reg)
+ buttons[i].type = be32_to_cpup(reg);
+ else
+ buttons[i].type = EV_KEY;
+
+ buttons[i].wakeup = !!of_get_property(pp, "wakeup", NULL);
+
+ reg = of_get_property(pp, "debounce-interval", &len);
+ if (reg)
+ buttons[i].debounce_interval = be32_to_cpup(reg);
+ else
+ buttons[i].debounce_interval = 5;
+
+ buttons[i].can_disable = (bool)!!of_get_property(pp, "linux,can-disable", NULL);
+ i++;
+ }
+
+ pdata->buttons = buttons;
+
+ return pdata;
+}
+#else
+static struct gpio_keys_platform_data *
+gpio_keys_get_devtree_pdata(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
static int __devinit gpio_keys_probe(struct platform_device *pdev)
{
struct gpio_keys_drvdata *ddata;
struct device *dev = &pdev->dev;
struct gpio_keys_platform_data *pdata = dev->platform_data;
+ struct gpio_keys_platform_data *dyn_pdata = NULL;
struct input_dev *input;
int i, error;
int wakeup = 0;
+ if (!pdata) {
+ pdata = gpio_keys_get_devtree_pdata(dev);
+ if (!pdata)
+ return -ENODEV;
+ /*
+ * Unlike normal platform_data, this is allocated
+ * dynamically and must be freed in the driver
+ */
+ dev->platform_data = pdata;
+ dyn_pdata = pdata;
+ }
+
ddata = kzalloc(sizeof(struct gpio_keys_drvdata) +
pdata->nbuttons * sizeof(struct gpio_button_data),
GFP_KERNEL);
+
+ ddata->dyn_pdata = dyn_pdata;
+
input = input_allocate_device();
if (!ddata || !input) {
dev_err(dev, "failed to allocate state\n");
@@ -565,12 +684,20 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
cancel_work_sync(&ddata->data[i].work);
gpio_free(pdata->buttons[i].gpio);
}
+ if (ddata->dyn_pdata) {
+ kfree(pdata->buttons);
+ kfree(pdata);
+ }
input_unregister_device(input);
return 0;
}
+static struct of_device_id gpio_keys_of_match[] = {
+ { .compatible = "gpio-keys", },
+ {},
+};
#ifdef CONFIG_PM
static int gpio_keys_suspend(struct device *dev)
@@ -618,6 +745,8 @@ static const struct dev_pm_ops gpio_keys_pm_ops = {
};
#endif
+MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
+
static struct platform_driver gpio_keys_device_driver = {
.probe = gpio_keys_probe,
.remove = __devexit_p(gpio_keys_remove),
@@ -627,6 +756,7 @@ static struct platform_driver gpio_keys_device_driver = {
#ifdef CONFIG_PM
.pm = &gpio_keys_pm_ops,
#endif
+ .of_match_table = gpio_keys_of_match,
}
};
--
1.7.4.1
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