diff options
Diffstat (limited to 'drivers/input/matrix-keymap.c')
| -rw-r--r-- | drivers/input/matrix-keymap.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/input/matrix-keymap.c b/drivers/input/matrix-keymap.c index 443ad64b7f2a..3ae496ea5fe6 100644 --- a/drivers/input/matrix-keymap.c +++ b/drivers/input/matrix-keymap.c @@ -18,11 +18,13 @@ */ #include <linux/device.h> +#include <linux/gfp.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/input.h> #include <linux/of.h> #include <linux/export.h> +#include <linux/module.h> #include <linux/input/matrix_keypad.h> static bool matrix_keypad_map_key(struct input_dev *input_dev, @@ -122,6 +124,11 @@ static int matrix_keypad_parse_of_keymap(const char *propname, * it will attempt load the keymap from property specified by @keymap_name * argument (or "linux,keymap" if @keymap_name is %NULL). * + * If @keymap is %NULL the function will automatically allocate managed + * block of memory to store the keymap. This memory will be associated with + * the parent device and automatically freed when device unbinds from the + * driver. + * * Callers are expected to set up input_dev->dev.parent before calling this * function. */ @@ -132,12 +139,27 @@ int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data, struct input_dev *input_dev) { unsigned int row_shift = get_count_order(cols); + size_t max_keys = rows << row_shift; int i; int error; + if (WARN_ON(!input_dev->dev.parent)) + return -EINVAL; + + if (!keymap) { + keymap = devm_kzalloc(input_dev->dev.parent, + max_keys * sizeof(*keymap), + GFP_KERNEL); + if (!keymap) { + dev_err(input_dev->dev.parent, + "Unable to allocate memory for keymap"); + return -ENOMEM; + } + } + input_dev->keycode = keymap; input_dev->keycodesize = sizeof(*keymap); - input_dev->keycodemax = rows << row_shift; + input_dev->keycodemax = max_keys; __set_bit(EV_KEY, input_dev->evbit); @@ -161,3 +183,5 @@ int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data, return 0; } EXPORT_SYMBOL(matrix_keypad_build_keymap); + +MODULE_LICENSE("GPL"); |