[PATCH] Input: gpio_keys_polled - keep button data constant
From: Dmitry Torokhov
Date: Fri Feb 26 2016 - 13:50:43 EST
Commit 633a21d80b4a ("input: gpio_keys_polled: Add support for GPIO
descriptors") placed gpio descriptor into gpio_keys_button structure, which
is supposed to be part of platform data and not modifiable by the driver.
To keep the data constant, let's move the descriptor to
gpio_keys_button_data structure instead.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
Compiled only, I do not have devices with polled keys...
drivers/input/keyboard/gpio_keys_polled.c | 104 ++++++++++++++++--------------
include/linux/gpio_keys.h | 4 +-
2 files changed, 58 insertions(+), 50 deletions(-)
diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index 62bdb1d..daef8ea 100644
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c
@@ -30,6 +30,7 @@
#define DRV_NAME "gpio-keys-polled"
struct gpio_keys_button_data {
+ struct gpio_desc *gpiod;
int last_state;
int count;
int threshold;
@@ -46,7 +47,7 @@ struct gpio_keys_polled_dev {
};
static void gpio_keys_button_event(struct input_polled_dev *dev,
- struct gpio_keys_button *button,
+ const struct gpio_keys_button *button,
int state)
{
struct gpio_keys_polled_dev *bdev = dev->private;
@@ -70,15 +71,15 @@ static void gpio_keys_button_event(struct input_polled_dev *dev,
}
static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
- struct gpio_keys_button *button,
+ const struct gpio_keys_button *button,
struct gpio_keys_button_data *bdata)
{
int state;
if (bdata->can_sleep)
- state = !!gpiod_get_value_cansleep(button->gpiod);
+ state = !!gpiod_get_value_cansleep(bdata->gpiod);
else
- state = !!gpiod_get_value(button->gpiod);
+ state = !!gpiod_get_value(bdata->gpiod);
gpio_keys_button_event(dev, button, state);
@@ -142,48 +143,35 @@ static void gpio_keys_polled_close(struct input_polled_dev *dev)
pdata->disable(bdev->dev);
}
-static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct device *dev)
+static struct gpio_keys_platform_data *
+gpio_keys_polled_get_devtree_pdata(struct device *dev)
{
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button *button;
struct fwnode_handle *child;
- int error;
int nbuttons;
nbuttons = device_get_child_node_count(dev);
if (nbuttons == 0)
- return NULL;
+ return ERR_PTR(-EINVAL);
pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button),
GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
- pdata->buttons = (struct gpio_keys_button *)(pdata + 1);
+ button = (struct gpio_keys_button *)(pdata + 1);
+
+ pdata->buttons = button;
+ pdata->nbuttons = nbuttons;
pdata->rep = device_property_present(dev, "autorepeat");
device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
device_for_each_child_node(dev, child) {
- struct gpio_desc *desc;
-
- desc = devm_get_gpiod_from_child(dev, NULL, child);
- if (IS_ERR(desc)) {
- error = PTR_ERR(desc);
- if (error != -EPROBE_DEFER)
- dev_err(dev,
- "Failed to get gpio flags, error: %d\n",
- error);
- fwnode_handle_put(child);
- return ERR_PTR(error);
- }
-
- button = &pdata->buttons[pdata->nbuttons++];
- button->gpiod = desc;
-
- if (fwnode_property_read_u32(child, "linux,code", &button->code)) {
- dev_err(dev, "Button without keycode: %d\n",
- pdata->nbuttons - 1);
+ if (fwnode_property_read_u32(child, "linux,code",
+ &button->code)) {
+ dev_err(dev, "button without keycode\n");
fwnode_handle_put(child);
return ERR_PTR(-EINVAL);
}
@@ -206,10 +194,9 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct
if (fwnode_property_read_u32(child, "debounce-interval",
&button->debounce_interval))
button->debounce_interval = 5;
- }
- if (pdata->nbuttons == 0)
- return ERR_PTR(-EINVAL);
+ button++;
+ }
return pdata;
}
@@ -220,7 +207,7 @@ static void gpio_keys_polled_set_abs_params(struct input_dev *input,
int i, min = 0, max = 0;
for (i = 0; i < pdata->nbuttons; i++) {
- struct gpio_keys_button *button = &pdata->buttons[i];
+ const struct gpio_keys_button *button = &pdata->buttons[i];
if (button->type != EV_ABS || button->code != code)
continue;
@@ -230,6 +217,7 @@ static void gpio_keys_polled_set_abs_params(struct input_dev *input,
if (button->value > max)
max = button->value;
}
+
input_set_abs_params(input, code, min, max, 0, 0);
}
@@ -242,6 +230,7 @@ MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
static int gpio_keys_polled_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct fwnode_handle *child = NULL;
const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
struct gpio_keys_polled_dev *bdev;
struct input_polled_dev *poll_dev;
@@ -254,10 +243,6 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
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) {
@@ -300,7 +285,7 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
__set_bit(EV_REP, input->evbit);
for (i = 0; i < pdata->nbuttons; i++) {
- struct gpio_keys_button *button = &pdata->buttons[i];
+ const struct gpio_keys_button *button = &pdata->buttons[i];
struct gpio_keys_button_data *bdata = &bdev->data[i];
unsigned int type = button->type ?: EV_KEY;
@@ -309,11 +294,30 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
return -EINVAL;
}
- /*
- * Legacy GPIO number so request the GPIO here and
- * convert it to descriptor.
- */
- if (!button->gpiod && gpio_is_valid(button->gpio)) {
+ if (!dev_get_platdata(dev)) {
+ /* No legacy static platform data */
+ child = device_get_next_child_node(dev, child);
+ if (!child) {
+ dev_err(dev, "missing child device node\n");
+ return -EINVAL;
+ }
+
+ bdata->gpiod = devm_get_gpiod_from_child(dev, NULL,
+ child);
+ if (IS_ERR(bdata->gpiod)) {
+ error = PTR_ERR(bdata->gpiod);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev,
+ "failed to get gpio: %d\n",
+ error);
+ fwnode_handle_put(child);
+ return error;
+ }
+ } else if (gpio_is_valid(button->gpio)) {
+ /*
+ * Legacy GPIO number so request the GPIO here and
+ * convert it to descriptor.
+ */
unsigned flags = GPIOF_IN;
if (button->active_low)
@@ -322,18 +326,22 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
error = devm_gpio_request_one(&pdev->dev, button->gpio,
flags, button->desc ? : DRV_NAME);
if (error) {
- dev_err(dev, "unable to claim gpio %u, err=%d\n",
+ dev_err(dev,
+ "unable to claim gpio %u, err=%d\n",
button->gpio, error);
return error;
}
- button->gpiod = gpio_to_desc(button->gpio);
+ bdata->gpiod = gpio_to_desc(button->gpio);
+ if (!bdata->gpiod) {
+ dev_err(dev,
+ "unable to convert gpio %u to descriptor\n",
+ button->gpio);
+ return -EINVAL;
+ }
}
- if (IS_ERR(button->gpiod))
- return PTR_ERR(button->gpiod);
-
- bdata->can_sleep = gpiod_cansleep(button->gpiod);
+ bdata->can_sleep = gpiod_cansleep(bdata->gpiod);
bdata->last_state = -1;
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
pdata->poll_interval);
@@ -344,6 +352,8 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
button->code);
}
+ fwnode_handle_put(child);
+
bdev->poll_dev = poll_dev;
bdev->dev = dev;
bdev->pdata = pdata;
diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h
index ee2d8c6..d1250ad 100644
--- a/include/linux/gpio_keys.h
+++ b/include/linux/gpio_keys.h
@@ -2,7 +2,6 @@
#define _GPIO_KEYS_H
struct device;
-struct gpio_desc;
/**
* struct gpio_keys_button - configuration parameters
@@ -31,7 +30,6 @@ struct gpio_keys_button {
bool can_disable;
int value;
unsigned int irq;
- struct gpio_desc *gpiod;
};
/**
@@ -46,7 +44,7 @@ struct gpio_keys_button {
* @name: input device name
*/
struct gpio_keys_platform_data {
- struct gpio_keys_button *buttons;
+ const struct gpio_keys_button *buttons;
int nbuttons;
unsigned int poll_interval;
unsigned int rep:1;
--
2.7.0.rc3.207.g0ac5344
--
Dmitry