Olof,
On 12/28/2011 04:52 PM, Olof Johansson wrote:
> From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
>
> This adds a basic device tree binding for simple key matrix data.
>
> Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
> ---
>
> Based on email exchange this morning, this is a first cut at a shared
> definition and helper function to parse and fill in the keymap data.
>
> Instead of doing the direct parsing into the final keymap format, I
> chose to fill in the pdata-equivalent since that is how the OF pdata
> fillers work right now if code is to be kept common with the legacy
> platform_device probe interface.
>
> This is a prerequisite for a revised version of the tegra-kbc device
> tree support that I will repost separately once this interface is stable.
>
>
> -Olof
>
> .../devicetree/bindings/input/matrix-keymap.txt | 35 ++++++++++++
> include/linux/input/matrix_keypad.h | 55 ++++++++++++++++++++
> 2 files changed, 90 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/input/matrix-keymap.txt
>
> diff --git a/Documentation/devicetree/bindings/input/matrix-keymap.txt b/Documentation/devicetree/bindings/input/matrix-keymap.txt
> new file mode 100644
> index 0000000..894f786
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/matrix-keymap.txt
> @@ -0,0 +1,35 @@
> +For matrix keyboards there are two kinds of layout bindings using
> +linux key codes.
> +
> +Required properties:
> +- compatible: "matrix-keyboard-controller"
Seems like this is not really needed. You've already matched the node
before you call matrix_keyboard_of_fill_keymap.
> +
> +For simple keyboards with just a few buttons, you can specify each key
> +as a subnode of the keyboard controller, with the following
> +properties:
> +
> +- keypad,row: the row number to which the key is connected.
> +- keypad,column: the column number to which the key is connected.
> +- linux,code: the key-code to be reported when the key is pressed
> + and released.
> +
> +Example:
> +
> + key_1 {
> + keypad,row = <0>;
> + keypad,column = <3>;
> + linux,code = <2>;
> + };
> +
> +
> +For a more complex keyboard, such as a full laptop, a more compact
> +binding can be used instead, with the following property directly in
> +the keyboard controller node:
> +
> +- linux,keymap: an array of 3-cell entries containing the equivalent
> + of the three separate properties above: row, column and linux
> + key-code.
> +
> +Example:
> + linux,keymap = < 0 3 2
> + 0 4 5 >;
> diff --git a/include/linux/input/matrix_keypad.h b/include/linux/input/matrix_keypad.h
> index fe7c4b9..ff13cd3 100644
> --- a/include/linux/input/matrix_keypad.h
> +++ b/include/linux/input/matrix_keypad.h
> @@ -3,6 +3,7 @@
>
> #include <linux/types.h>
> #include <linux/input.h>
> +#include <linux/of.h>
>
> #define MATRIX_MAX_ROWS 32
> #define MATRIX_MAX_COLS 32
> @@ -106,4 +107,58 @@ matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
> __clear_bit(KEY_RESERVED, keybit);
> }
>
> +#ifdef CONFIG_OF
> +static inline struct matrix_keymap_data *
> +matrix_keyboard_of_fill_keymap(struct device_node *np)
> +{
Seems a bit large to inline.
> + struct matrix_keymap_data *kd;
> + struct device_node *knp;
> + int proplen = 0, i;
> + u32 *keymap, row, col, key_code;
> + const __be32 *prop = of_get_property(np, "linux,keymap", &proplen);
> +
> + if (!of_device_is_compatible(np, "matrix-keyboard-controller"))
> + return NULL;
> +
> + kd = kmalloc(sizeof(*kd), GFP_KERNEL);
> + if (!kd)
> + return NULL;
> + kd->keymap_size = proplen / 3;
> +
> + for_each_child_of_node(np, knp)
> + kd->keymap_size++;
> +
> + keymap = kzalloc(kd->keymap_size * sizeof(u32), GFP_KERNEL);
> + if (!keymap) {
> + kfree(kd);
> + return NULL;
> + }
Looks like memory leaks would be very likely. Is the caller expected to
free these? If so, a matching free function should be provided. Perhaps
trying to keep platform_data compatibility is not the best approach if
it would simplify this.
Rob
> +
> + kd->keymap = keymap;
> +
> + for (i = 0; i < proplen/3; i++){
> + /* property format is < row column keycode > */
> + row = be32_to_cpup(prop++);
> + col = be32_to_cpup(prop++);
> + key_code = be32_to_cpup(prop++);
> + *keymap++ = KEY(row, col, key_code);
> + }
> +
> + for_each_child_of_node(np, knp) {
> + of_property_read_u32(knp, "keypad,row", &row);
> + of_property_read_u32(knp, "keypad,column", &col);
> + of_property_read_u32(knp, "linux,code", &key_code);
> + *keymap++ = KEY(row, col, key_code);
> + }
> +
> + return kd;
> +}
> +#else
> +static inline struct matrix_keymap_data *
> +matrix_keyboard_of_fill_keymap(struct device_node *np)
> +{
> + return NULL;
> +}
> +#endif
> +
> #endif /* _MATRIX_KEYPAD_H */
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