* [PATCH v2 0/3] INPUT: gpio_keys.c: Added OF support and enabled use with I2C GPIO expanders
@ 2011-06-06 15:12 David Jander
2011-06-06 15:12 ` [PATCH 1/3] Input: gpio_keys.c: Simplify platform_device -> device casting David Jander
` (2 more replies)
0 siblings, 3 replies; 8+ messages in thread
From: David Jander @ 2011-06-06 15:12 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: Grant Likely, linux-input
This is the second version of this patch, spit-out in three separate patches.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH 1/3] Input: gpio_keys.c: Simplify platform_device -> device casting
2011-06-06 15:12 [PATCH v2 0/3] INPUT: gpio_keys.c: Added OF support and enabled use with I2C GPIO expanders David Jander
@ 2011-06-06 15:12 ` David Jander
2011-06-06 15:26 ` Grant Likely
2011-06-06 15:12 ` [PATCH 2/3] Input: gpio_keys.c: Added support for device-tree platform data David Jander
2011-06-06 15:12 ` [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local GPIO chips David Jander
2 siblings, 1 reply; 8+ messages in thread
From: David Jander @ 2011-06-06 15:12 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: Grant Likely, linux-input, David Jander
This patch factors out the use of struct platform_device *pdev in most
places.
Signed-off-by: David Jander <david@protonic.nl>
---
drivers/input/keyboard/gpio_keys.c | 46 ++++++++++++++++-------------------
1 files changed, 21 insertions(+), 25 deletions(-)
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 6e6145b..987498e 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -251,8 +251,7 @@ static ssize_t gpio_keys_show_##name(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
- struct platform_device *pdev = to_platform_device(dev); \
- struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
+ struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); \
\
return gpio_keys_attr_show_helper(ddata, buf, \
type, only_disabled); \
@@ -278,8 +277,7 @@ static ssize_t gpio_keys_store_##name(struct device *dev, \
const char *buf, \
size_t count) \
{ \
- struct platform_device *pdev = to_platform_device(dev); \
- struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
+ struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); \
ssize_t error; \
\
error = gpio_keys_attr_store_helper(ddata, buf, type); \
@@ -364,12 +362,11 @@ static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int __devinit gpio_keys_setup_key(struct platform_device *pdev,
+static int __devinit gpio_keys_setup_key(struct device *dev,
struct gpio_button_data *bdata,
struct gpio_keys_button *button)
{
const char *desc = button->desc ? button->desc : "gpio_keys";
- struct device *dev = &pdev->dev;
unsigned long irqflags;
int irq, error;
@@ -447,9 +444,9 @@ static void gpio_keys_close(struct input_dev *input)
static int __devinit gpio_keys_probe(struct platform_device *pdev)
{
- struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct gpio_keys_drvdata *ddata;
struct device *dev = &pdev->dev;
+ struct gpio_keys_platform_data *pdata = dev->platform_data;
struct input_dev *input;
int i, error;
int wakeup = 0;
@@ -470,12 +467,12 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
ddata->disable = pdata->disable;
mutex_init(&ddata->disable_lock);
- platform_set_drvdata(pdev, ddata);
+ dev_set_drvdata(dev, ddata);
input_set_drvdata(input, ddata);
input->name = pdata->name ? : pdev->name;
input->phys = "gpio-keys/input0";
- input->dev.parent = &pdev->dev;
+ input->dev.parent = dev;
input->open = gpio_keys_open;
input->close = gpio_keys_close;
@@ -496,7 +493,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
bdata->input = input;
bdata->button = button;
- error = gpio_keys_setup_key(pdev, bdata, button);
+ error = gpio_keys_setup_key(dev, bdata, button);
if (error)
goto fail2;
@@ -506,7 +503,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
input_set_capability(input, type, button->code);
}
- error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group);
+ error = sysfs_create_group(&dev->kobj, &gpio_keys_attr_group);
if (error) {
dev_err(dev, "Unable to export keys/switches, error: %d\n",
error);
@@ -525,12 +522,12 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
gpio_keys_report_event(&ddata->data[i]);
input_sync(input);
- device_init_wakeup(&pdev->dev, wakeup);
+ device_init_wakeup(dev, wakeup);
return 0;
fail3:
- sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
+ sysfs_remove_group(&dev->kobj, &gpio_keys_attr_group);
fail2:
while (--i >= 0) {
free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]);
@@ -540,7 +537,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
gpio_free(pdata->buttons[i].gpio);
}
- platform_set_drvdata(pdev, NULL);
+ dev_set_drvdata(dev, NULL);
fail1:
input_free_device(input);
kfree(ddata);
@@ -550,14 +547,15 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
static int __devexit gpio_keys_remove(struct platform_device *pdev)
{
- struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
- struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+ struct gpio_keys_platform_data *pdata = dev->platform_data;
+ struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
int i;
- sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
+ sysfs_remove_group(&dev->kobj, &gpio_keys_attr_group);
- device_init_wakeup(&pdev->dev, 0);
+ device_init_wakeup(dev, 0);
for (i = 0; i < pdata->nbuttons; i++) {
int irq = gpio_to_irq(pdata->buttons[i].gpio);
@@ -577,11 +575,10 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
#ifdef CONFIG_PM
static int gpio_keys_suspend(struct device *dev)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+ struct gpio_keys_platform_data *pdata = dev->platform_data;
int i;
- if (device_may_wakeup(&pdev->dev)) {
+ if (device_may_wakeup(dev)) {
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &pdata->buttons[i];
if (button->wakeup) {
@@ -596,15 +593,14 @@ static int gpio_keys_suspend(struct device *dev)
static int gpio_keys_resume(struct device *dev)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
- struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+ struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
+ struct gpio_keys_platform_data *pdata = dev->platform_data;
int i;
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &pdata->buttons[i];
- if (button->wakeup && device_may_wakeup(&pdev->dev)) {
+ if (button->wakeup && device_may_wakeup(dev)) {
int irq = gpio_to_irq(button->gpio);
disable_irq_wake(irq);
}
--
1.7.4.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH 2/3] Input: gpio_keys.c: Added support for device-tree platform data
2011-06-06 15:12 [PATCH v2 0/3] INPUT: gpio_keys.c: Added OF support and enabled use with I2C GPIO expanders David Jander
2011-06-06 15:12 ` [PATCH 1/3] Input: gpio_keys.c: Simplify platform_device -> device casting David Jander
@ 2011-06-06 15:12 ` David Jander
2011-06-06 15:52 ` Grant Likely
2011-06-06 15:12 ` [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local GPIO chips David Jander
2 siblings, 1 reply; 8+ messages in thread
From: David Jander @ 2011-06-06 15:12 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: Grant Likely, linux-input, David Jander
Signed-off-by: David Jander <david@protonic.nl>
---
.../devicetree/bindings/gpio/gpio_keys.txt | 49 ++++++++
drivers/input/keyboard/gpio_keys.c | 131 ++++++++++++++++++++
2 files changed, 180 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..ff8ba2e
--- /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 = "linux,gpio-keys", "gpio-keys";
+
+Optional properties:
+ - linux,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:
+ - linux,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.
+ - linux,debounc_interval: Debouncing interval time in milliseconds.
+ Default if unspecified is 5.
+ - linux,can_disable: Boolean, specify if key can be disabled via
+ module parameter.
+ - linux,wakeup: Boolean, button can wake-up the system.
+
+Example nodes:
+
+ gpio_keys {
+ compatible = "linux,gpio-keys", "gpio-keys";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ linux,autorepeat;
+ button@20 {
+ label = "GPIO Key ESC";
+ linux,code = <1>;
+ reg = <0x20>;
+ linux,active_low;
+ linux,input_type = <1>;
+ };
+ button@21 {
+ label = "GPIO Key UP";
+ linux,code = <103>;
+ reg = <0x21>;
+ linux,active_low;
+ linux,input_type = <1>;
+ };
+ ...
+
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 987498e..4efd067 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@protonic.nl>
+ *
* 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, "linux,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 = reg[0];
+
+ 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 = reg[0];
+
+ lbl = of_get_property(pp, "label", &len);
+ buttons[i].desc = (char *)lbl;
+
+ buttons[i].active_low = !!of_get_property(pp, "linux,active_low", NULL);
+
+ reg = of_get_property(pp, "linux,input_type", &len);
+ if (reg)
+ buttons[i].type = reg[0];
+ else
+ buttons[i].type = EV_KEY;
+
+ buttons[i].wakeup = !!of_get_property(pp, "linux,wakeup", NULL);
+
+ reg = of_get_property(pp, "linux,debounc_interval", &len);
+ if (reg)
+ buttons[i].debounce_interval = reg[0];
+ 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 +684,21 @@ 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 = "linux,gpio-keys", },
+ { .compatible = "gpio-keys", },
+ {},
+};
#ifdef CONFIG_PM
static int gpio_keys_suspend(struct device *dev)
@@ -618,6 +746,8 @@ 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 +757,7 @@ 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
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local GPIO chips.
2011-06-06 15:12 [PATCH v2 0/3] INPUT: gpio_keys.c: Added OF support and enabled use with I2C GPIO expanders David Jander
2011-06-06 15:12 ` [PATCH 1/3] Input: gpio_keys.c: Simplify platform_device -> device casting David Jander
2011-06-06 15:12 ` [PATCH 2/3] Input: gpio_keys.c: Added support for device-tree platform data David Jander
@ 2011-06-06 15:12 ` David Jander
2011-06-06 16:15 ` Grant Likely
2 siblings, 1 reply; 8+ messages in thread
From: David Jander @ 2011-06-06 15:12 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: Grant Likely, linux-input, David Jander
Use a threaded interrupt handler in order to permit the handler to use
a GPIO driver that causes things like I2C transactions being done inside
the handler context.
Also, gpio_keys_init needs to be declared as a late_initcall, to make sure
all needed GPIO drivers have been loaded if the drivers are built into the
kernel.
Signed-off-by: David Jander <david@protonic.nl>
---
drivers/input/keyboard/gpio_keys.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 4efd067..bfbdfe8 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -3,7 +3,7 @@
*
* Copyright 2005 Phil Blundell
*
- * Added OF support:
+ * Added OF support and enabled use with I2C GPIO expanders:
* Copyright 2010 David Jander <david@protonic.nl>
*
* This program is free software; you can redistribute it and/or modify
@@ -418,7 +418,7 @@ static int __devinit gpio_keys_setup_key(struct device *dev,
if (!button->can_disable)
irqflags |= IRQF_SHARED;
- error = request_any_context_irq(irq, gpio_keys_isr, irqflags, desc, bdata);
+ error = request_threaded_irq(irq, NULL, gpio_keys_isr, irqflags, desc, bdata);
if (error < 0) {
dev_err(dev, "Unable to claim irq %d; error %d\n",
irq, error);
@@ -771,10 +771,10 @@ static void __exit gpio_keys_exit(void)
platform_driver_unregister(&gpio_keys_device_driver);
}
-module_init(gpio_keys_init);
+late_initcall(gpio_keys_init);
module_exit(gpio_keys_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
-MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs");
+MODULE_DESCRIPTION("Keyboard driver for GPIOs");
MODULE_ALIAS("platform:gpio-keys");
--
1.7.4.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH 1/3] Input: gpio_keys.c: Simplify platform_device -> device casting
2011-06-06 15:12 ` [PATCH 1/3] Input: gpio_keys.c: Simplify platform_device -> device casting David Jander
@ 2011-06-06 15:26 ` Grant Likely
0 siblings, 0 replies; 8+ messages in thread
From: Grant Likely @ 2011-06-06 15:26 UTC (permalink / raw)
To: David Jander; +Cc: Dmitry Torokhov, linux-input
On Mon, Jun 6, 2011 at 9:12 AM, David Jander <david@protonic.nl> wrote:
> This patch factors out the use of struct platform_device *pdev in most
> places.
>
> Signed-off-by: David Jander <david@protonic.nl>
Looks right.
Acked-by: Grant Likely <grant.likely@secretlab.ca>
> ---
> drivers/input/keyboard/gpio_keys.c | 46 ++++++++++++++++-------------------
> 1 files changed, 21 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
> index 6e6145b..987498e 100644
> --- a/drivers/input/keyboard/gpio_keys.c
> +++ b/drivers/input/keyboard/gpio_keys.c
> @@ -251,8 +251,7 @@ static ssize_t gpio_keys_show_##name(struct device *dev, \
> struct device_attribute *attr, \
> char *buf) \
> { \
> - struct platform_device *pdev = to_platform_device(dev); \
> - struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
> + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); \
> \
> return gpio_keys_attr_show_helper(ddata, buf, \
> type, only_disabled); \
> @@ -278,8 +277,7 @@ static ssize_t gpio_keys_store_##name(struct device *dev, \
> const char *buf, \
> size_t count) \
> { \
> - struct platform_device *pdev = to_platform_device(dev); \
> - struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
> + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); \
> ssize_t error; \
> \
> error = gpio_keys_attr_store_helper(ddata, buf, type); \
> @@ -364,12 +362,11 @@ static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> -static int __devinit gpio_keys_setup_key(struct platform_device *pdev,
> +static int __devinit gpio_keys_setup_key(struct device *dev,
> struct gpio_button_data *bdata,
> struct gpio_keys_button *button)
> {
> const char *desc = button->desc ? button->desc : "gpio_keys";
> - struct device *dev = &pdev->dev;
> unsigned long irqflags;
> int irq, error;
>
> @@ -447,9 +444,9 @@ static void gpio_keys_close(struct input_dev *input)
>
> static int __devinit gpio_keys_probe(struct platform_device *pdev)
> {
> - struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
> struct gpio_keys_drvdata *ddata;
> struct device *dev = &pdev->dev;
> + struct gpio_keys_platform_data *pdata = dev->platform_data;
> struct input_dev *input;
> int i, error;
> int wakeup = 0;
> @@ -470,12 +467,12 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
> ddata->disable = pdata->disable;
> mutex_init(&ddata->disable_lock);
>
> - platform_set_drvdata(pdev, ddata);
> + dev_set_drvdata(dev, ddata);
> input_set_drvdata(input, ddata);
>
> input->name = pdata->name ? : pdev->name;
> input->phys = "gpio-keys/input0";
> - input->dev.parent = &pdev->dev;
> + input->dev.parent = dev;
> input->open = gpio_keys_open;
> input->close = gpio_keys_close;
>
> @@ -496,7 +493,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
> bdata->input = input;
> bdata->button = button;
>
> - error = gpio_keys_setup_key(pdev, bdata, button);
> + error = gpio_keys_setup_key(dev, bdata, button);
> if (error)
> goto fail2;
>
> @@ -506,7 +503,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
> input_set_capability(input, type, button->code);
> }
>
> - error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group);
> + error = sysfs_create_group(&dev->kobj, &gpio_keys_attr_group);
> if (error) {
> dev_err(dev, "Unable to export keys/switches, error: %d\n",
> error);
> @@ -525,12 +522,12 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
> gpio_keys_report_event(&ddata->data[i]);
> input_sync(input);
>
> - device_init_wakeup(&pdev->dev, wakeup);
> + device_init_wakeup(dev, wakeup);
>
> return 0;
>
> fail3:
> - sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
> + sysfs_remove_group(&dev->kobj, &gpio_keys_attr_group);
> fail2:
> while (--i >= 0) {
> free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]);
> @@ -540,7 +537,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
> gpio_free(pdata->buttons[i].gpio);
> }
>
> - platform_set_drvdata(pdev, NULL);
> + dev_set_drvdata(dev, NULL);
> fail1:
> input_free_device(input);
> kfree(ddata);
> @@ -550,14 +547,15 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
>
> static int __devexit gpio_keys_remove(struct platform_device *pdev)
> {
> - struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
> - struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
> + struct device *dev = &pdev->dev;
> + struct gpio_keys_platform_data *pdata = dev->platform_data;
> + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
> struct input_dev *input = ddata->input;
> int i;
>
> - sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
> + sysfs_remove_group(&dev->kobj, &gpio_keys_attr_group);
>
> - device_init_wakeup(&pdev->dev, 0);
> + device_init_wakeup(dev, 0);
>
> for (i = 0; i < pdata->nbuttons; i++) {
> int irq = gpio_to_irq(pdata->buttons[i].gpio);
> @@ -577,11 +575,10 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
> #ifdef CONFIG_PM
> static int gpio_keys_suspend(struct device *dev)
> {
> - struct platform_device *pdev = to_platform_device(dev);
> - struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
> + struct gpio_keys_platform_data *pdata = dev->platform_data;
> int i;
>
> - if (device_may_wakeup(&pdev->dev)) {
> + if (device_may_wakeup(dev)) {
> for (i = 0; i < pdata->nbuttons; i++) {
> struct gpio_keys_button *button = &pdata->buttons[i];
> if (button->wakeup) {
> @@ -596,15 +593,14 @@ static int gpio_keys_suspend(struct device *dev)
>
> static int gpio_keys_resume(struct device *dev)
> {
> - struct platform_device *pdev = to_platform_device(dev);
> - struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
> - struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
> + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
> + struct gpio_keys_platform_data *pdata = dev->platform_data;
> int i;
>
> for (i = 0; i < pdata->nbuttons; i++) {
>
> struct gpio_keys_button *button = &pdata->buttons[i];
> - if (button->wakeup && device_may_wakeup(&pdev->dev)) {
> + if (button->wakeup && device_may_wakeup(dev)) {
> int irq = gpio_to_irq(button->gpio);
> disable_irq_wake(irq);
> }
> --
> 1.7.4.1
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH 2/3] Input: gpio_keys.c: Added support for device-tree platform data
2011-06-06 15:12 ` [PATCH 2/3] Input: gpio_keys.c: Added support for device-tree platform data David Jander
@ 2011-06-06 15:52 ` Grant Likely
0 siblings, 0 replies; 8+ messages in thread
From: Grant Likely @ 2011-06-06 15:52 UTC (permalink / raw)
To: David Jander; +Cc: Dmitry Torokhov, linux-input
On Mon, Jun 6, 2011 at 9:12 AM, David Jander <david@protonic.nl> wrote:
> Signed-off-by: David Jander <david@protonic.nl>
> ---
> .../devicetree/bindings/gpio/gpio_keys.txt | 49 ++++++++
> drivers/input/keyboard/gpio_keys.c | 131 ++++++++++++++++++++
> 2 files changed, 180 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..ff8ba2e
> --- /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 = "linux,gpio-keys", "gpio-keys";
Drop linux,gpio-keys
> +
> +Optional properties:
> + - linux,autorepeat: Boolean, Enable auto repeat feature of Linux input
> + subsystem.
Drop the linux specific bits. Define the properties you need to
describe the behaviour or the keypad without making it linux-specific.
The binding should make sense regardless of either future changes to
the driver, or when using a different OS.
> +
> +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.
Hmm, is there an OS-neutral way to specify this? There may not be,
but if there is then it should be looked at seriously.
> +
> +Optional subnode-properties:
> + - linux,active_low: Boolean flag to specify active-low GPIO input.
This isn't really a linux-specific thing. Perhaps use the name
"key-active-low".
Also, use '-' instead of '_' in property names.
> + - linux,input_type: Specify event type this button/key generates.
> + Default if unspecified is <1> == EV_KEY.
> + - linux,debounc_interval: Debouncing interval time in milliseconds.
> + Default if unspecified is 5.
Debounce is spelled with 2 'e's. :-) Also not linux specific.
Should be renamed. It would probably make sense to also allow a
debounce intervale property in the parent node. I suspect that a
single debounce interval value will simply be used by all keys in a
gpio-keys block.
> + - linux,can_disable: Boolean, specify if key can be disabled via
> + module parameter.
Is this really needed? Or even a good idea? It looks to be encoding
a driver-specific implementation detail that could potentially change
in the future.
> + - linux,wakeup: Boolean, button can wake-up the system.
Again, not linux-specific.
> +
> +Example nodes:
> +
> + gpio_keys {
> + compatible = "linux,gpio-keys", "gpio-keys";
> + #address-cells = <1>;
> + #size-cells = <0>;
> + linux,autorepeat;
> + button@20 {
> + label = "GPIO Key ESC";
> + linux,code = <1>;
> + reg = <0x20>;
> + linux,active_low;
> + linux,input_type = <1>;
> + };
> + button@21 {
> + label = "GPIO Key UP";
> + linux,code = <103>;
> + reg = <0x21>;
> + linux,active_low;
> + linux,input_type = <1>;
> + };
> + ...
> +
> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
> index 987498e..4efd067 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@protonic.nl>
> + *
> * 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, "linux,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 = reg[0];
> +
> + 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 = reg[0];
> +
> + lbl = of_get_property(pp, "label", &len);
> + buttons[i].desc = (char *)lbl;
> +
> + buttons[i].active_low = !!of_get_property(pp, "linux,active_low", NULL);
> +
> + reg = of_get_property(pp, "linux,input_type", &len);
> + if (reg)
> + buttons[i].type = reg[0];
You need to do an endian conversion on device tree data. be32_to_cpup(reg);
> + else
> + buttons[i].type = EV_KEY;
> +
> + buttons[i].wakeup = !!of_get_property(pp, "linux,wakeup", NULL);
> +
> + reg = of_get_property(pp, "linux,debounc_interval", &len);
> + if (reg)
> + buttons[i].debounce_interval = reg[0];
> + 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 +684,21 @@ 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 = "linux,gpio-keys", },
> + { .compatible = "gpio-keys", },
You don't need both values here. "gpio-keys" is fine.
> + {},
> +};
>
> #ifdef CONFIG_PM
> static int gpio_keys_suspend(struct device *dev)
> @@ -618,6 +746,8 @@ 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 +757,7 @@ 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
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
--
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local GPIO chips.
2011-06-06 15:12 ` [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local GPIO chips David Jander
@ 2011-06-06 16:15 ` Grant Likely
0 siblings, 0 replies; 8+ messages in thread
From: Grant Likely @ 2011-06-06 16:15 UTC (permalink / raw)
To: David Jander; +Cc: Dmitry Torokhov, linux-input
On Mon, Jun 6, 2011 at 9:12 AM, David Jander <david@protonic.nl> wrote:
> Use a threaded interrupt handler in order to permit the handler to use
> a GPIO driver that causes things like I2C transactions being done inside
> the handler context.
> Also, gpio_keys_init needs to be declared as a late_initcall, to make sure
> all needed GPIO drivers have been loaded if the drivers are built into the
> kernel.
>
> Signed-off-by: David Jander <david@protonic.nl>
Looks okay to me. Acked-by: Grant Likely <grant.likely@secretlab.ca>
> ---
> drivers/input/keyboard/gpio_keys.c | 8 ++++----
> 1 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
> index 4efd067..bfbdfe8 100644
> --- a/drivers/input/keyboard/gpio_keys.c
> +++ b/drivers/input/keyboard/gpio_keys.c
> @@ -3,7 +3,7 @@
> *
> * Copyright 2005 Phil Blundell
> *
> - * Added OF support:
> + * Added OF support and enabled use with I2C GPIO expanders:
> * Copyright 2010 David Jander <david@protonic.nl>
> *
> * This program is free software; you can redistribute it and/or modify
> @@ -418,7 +418,7 @@ static int __devinit gpio_keys_setup_key(struct device *dev,
> if (!button->can_disable)
> irqflags |= IRQF_SHARED;
>
> - error = request_any_context_irq(irq, gpio_keys_isr, irqflags, desc, bdata);
> + error = request_threaded_irq(irq, NULL, gpio_keys_isr, irqflags, desc, bdata);
> if (error < 0) {
> dev_err(dev, "Unable to claim irq %d; error %d\n",
> irq, error);
> @@ -771,10 +771,10 @@ static void __exit gpio_keys_exit(void)
> platform_driver_unregister(&gpio_keys_device_driver);
> }
>
> -module_init(gpio_keys_init);
> +late_initcall(gpio_keys_init);
> module_exit(gpio_keys_exit);
>
> MODULE_LICENSE("GPL");
> MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
> -MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs");
> +MODULE_DESCRIPTION("Keyboard driver for GPIOs");
> MODULE_ALIAS("platform:gpio-keys");
> --
> 1.7.4.1
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
--
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^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local GPIO chips.
2011-06-07 9:04 [PATCH v3 0/3] Input: gpio_keys.c: Add support for OF and I2C " David Jander
@ 2011-06-07 9:04 ` David Jander
0 siblings, 0 replies; 8+ messages in thread
From: David Jander @ 2011-06-07 9:04 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: Grant Likely, linux-input, David Jander
Use a threaded interrupt handler in order to permit the handler to use
a GPIO driver that causes things like I2C transactions being done inside
the handler context.
Also, gpio_keys_init needs to be declared as a late_initcall, to make sure
all needed GPIO drivers have been loaded if the drivers are built into the
kernel.
Signed-off-by: David Jander <david@protonic.nl>
---
drivers/input/keyboard/gpio_keys.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 4539b0b..bbb4e4d 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -3,7 +3,7 @@
*
* Copyright 2005 Phil Blundell
*
- * Added OF support:
+ * Added OF support and enabled use with I2C GPIO expanders:
* Copyright 2010 David Jander <david@protonic.nl>
*
* This program is free software; you can redistribute it and/or modify
@@ -418,7 +418,7 @@ static int __devinit gpio_keys_setup_key(struct device *dev,
if (!button->can_disable)
irqflags |= IRQF_SHARED;
- error = request_any_context_irq(irq, gpio_keys_isr, irqflags, desc, bdata);
+ error = request_threaded_irq(irq, NULL, gpio_keys_isr, irqflags, desc, bdata);
if (error < 0) {
dev_err(dev, "Unable to claim irq %d; error %d\n",
irq, error);
@@ -770,10 +770,10 @@ static void __exit gpio_keys_exit(void)
platform_driver_unregister(&gpio_keys_device_driver);
}
-module_init(gpio_keys_init);
+late_initcall(gpio_keys_init);
module_exit(gpio_keys_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
-MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs");
+MODULE_DESCRIPTION("Keyboard driver for GPIOs");
MODULE_ALIAS("platform:gpio-keys");
--
1.7.4.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
end of thread, other threads:[~2011-06-07 9:05 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-06-06 15:12 [PATCH v2 0/3] INPUT: gpio_keys.c: Added OF support and enabled use with I2C GPIO expanders David Jander
2011-06-06 15:12 ` [PATCH 1/3] Input: gpio_keys.c: Simplify platform_device -> device casting David Jander
2011-06-06 15:26 ` Grant Likely
2011-06-06 15:12 ` [PATCH 2/3] Input: gpio_keys.c: Added support for device-tree platform data David Jander
2011-06-06 15:52 ` Grant Likely
2011-06-06 15:12 ` [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local GPIO chips David Jander
2011-06-06 16:15 ` Grant Likely
2011-06-07 9:04 [PATCH v3 0/3] Input: gpio_keys.c: Add support for OF and I2C " David Jander
2011-06-07 9:04 ` [PATCH 3/3] Input: gpio_keys.c: Enable use with non-local " David Jander
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