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path: root/drivers/input/keyboard/gpio_keys.c
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Diffstat (limited to 'drivers/input/keyboard/gpio_keys.c')
-rw-r--r--drivers/input/keyboard/gpio_keys.c29
1 files changed, 23 insertions, 6 deletions
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index bef317ff7352..b9f01bd1b7ef 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -96,7 +96,7 @@ struct gpio_keys_drvdata {
* Return value of this function can be used to allocate bitmap
* large enough to hold all bits for given type.
*/
-static inline int get_n_events_by_type(int type)
+static int get_n_events_by_type(int type)
{
BUG_ON(type != EV_SW && type != EV_KEY);
@@ -104,6 +104,22 @@ static inline int get_n_events_by_type(int type)
}
/**
+ * get_bm_events_by_type() - returns bitmap of supported events per @type
+ * @input: input device from which bitmap is retrieved
+ * @type: type of button (%EV_KEY, %EV_SW)
+ *
+ * Return value of this function can be used to allocate bitmap
+ * large enough to hold all bits for given type.
+ */
+static const unsigned long *get_bm_events_by_type(struct input_dev *dev,
+ int type)
+{
+ BUG_ON(type != EV_SW && type != EV_KEY);
+
+ return (type == EV_KEY) ? dev->keybit : dev->swbit;
+}
+
+/**
* gpio_keys_disable_button() - disables given GPIO button
* @bdata: button data for button to be disabled
*
@@ -213,6 +229,7 @@ static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
const char *buf, unsigned int type)
{
int n_events = get_n_events_by_type(type);
+ const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type);
unsigned long *bits;
ssize_t error;
int i;
@@ -226,6 +243,11 @@ static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
goto out;
/* First validate */
+ if (!bitmap_subset(bits, bitmap, n_events)) {
+ error = -EINVAL;
+ goto out;
+ }
+
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
@@ -239,11 +261,6 @@ static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
}
}
- if (i == ddata->pdata->nbuttons) {
- error = -EINVAL;
- goto out;
- }
-
mutex_lock(&ddata->disable_lock);
for (i = 0; i < ddata->pdata->nbuttons; i++) {