This adds a simple device tree binding for simple key matrix data and a helper to fill in the platform data.
The implementation is in a shared file outside if drivers/input/keyboard since some drivers in drivers/input/misc might be making use of it as well. Changes since v2: * Removed reference to "legacy" format with a subnode per key * Changed to a packed format with one cell per key instead of 3. * Moved new OF helper to separate file * Misc fixups based on comments Changes since v1: * Removed samsung-style binding support * Added linux,fn-keymap and linux,fn-key optional properties Signed-off-by: Olof Johansson <[email protected]> --- .../devicetree/bindings/input/matrix-keymap.txt | 27 ++++++ drivers/input/Kconfig | 4 + drivers/input/Makefile | 1 + drivers/input/keyboard/Kconfig | 1 + drivers/input/of_keymap.c | 87 ++++++++++++++++++++ include/linux/input/matrix_keypad.h | 19 ++++ 6 files changed, 139 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/input/matrix-keymap.txt create mode 100644 drivers/input/of_keymap.c diff --git a/Documentation/devicetree/bindings/input/matrix-keymap.txt b/Documentation/devicetree/bindings/input/matrix-keymap.txt new file mode 100644 index 0000000..1db8e12 --- /dev/null +++ b/Documentation/devicetree/bindings/input/matrix-keymap.txt @@ -0,0 +1,27 @@ +A simple common binding for matrix-connected key boards. Currently targeted at +defining the keys in the scope of linux key codes since that is a stable and +standardized interface at this time. + +Required properties: +- compatible: "matrix-keyboard-controller" +- linux,keymap: an array of packed 1-cell entries containing the equivalent + of row, column and linux key-code. The 32-bit big endian cell is packed + as: + row << 24 | column << 16 | key-code + +Optional properties: +- linux,fn-keymap: A separate array of packed 1-cell entries similar to + linux,keymap but only to be used when the function key modifier is + active. This is used for keyboards that have a software-based modifier + key for 'Fn' but that need to describe the custom layout that should + be used when said modifier key is active. + +- linux,fn-key: a 2-cell entry containing the < row column > of the + function modifier key used to switch to the above linux,fn-keymap + layout. + +Example: + linux,keymap = < 0x00030012 + 0x0102003a >; + linux,fn-key = < 2 1 >; + linux,fn-keymap = < 0x0002004a >; diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig index 001b147..3325979 100644 --- a/drivers/input/Kconfig +++ b/drivers/input/Kconfig @@ -25,6 +25,10 @@ config INPUT if INPUT +config INPUT_OF_MATRIX_KEYMAP + depends on USE_OF + bool + config INPUT_FF_MEMLESS tristate "Support for memoryless force-feedback devices" help diff --git a/drivers/input/Makefile b/drivers/input/Makefile index 0c78949..b173a13a 100644 --- a/drivers/input/Makefile +++ b/drivers/input/Makefile @@ -24,3 +24,4 @@ obj-$(CONFIG_INPUT_TOUCHSCREEN) += touchscreen/ obj-$(CONFIG_INPUT_MISC) += misc/ obj-$(CONFIG_INPUT_APMPOWER) += apm-power.o +obj-$(CONFIG_INPUT_OF_MATRIX_KEYMAP) += of_keymap.o diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index cdc385b..3371954c 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -394,6 +394,7 @@ config KEYBOARD_NOMADIK config KEYBOARD_TEGRA tristate "NVIDIA Tegra internal matrix keyboard controller support" depends on ARCH_TEGRA + select INPUT_OF_MATRIX_KEYMAP if USE_OF help Say Y here if you want to use a matrix keyboard connected directly to the internal keyboard controller on Tegra SoCs. diff --git a/drivers/input/of_keymap.c b/drivers/input/of_keymap.c new file mode 100644 index 0000000..b33627d --- /dev/null +++ b/drivers/input/of_keymap.c @@ -0,0 +1,87 @@ +/* + * Helpers for open firmware matrix keyboard bindings + * + * Copyright (C) 2012 Google, Inc + * + * Author: + * Olof Johansson <[email protected]> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/input.h> +#include <linux/of.h> +#include <linux/input/matrix_keypad.h> +#include <linux/export.h> +#include <linux/gfp.h> +#include <linux/slab.h> + +struct matrix_keymap_data * +matrix_keyboard_of_fill_keymap(struct device_node *np) +{ + struct matrix_keymap_data *kd; + int proplen = 0, i; + u32 *keymap; + const __be32 *prop; + + if (!np) + return NULL; + + prop = of_get_property(np, "linux,keymap", &proplen); + + if (!of_device_is_compatible(np, "matrix-keyboard-controller")) + return NULL; + + if (proplen % 4) { + pr_warn("Malformed linux,keymap property in %s\n", + np->full_name); + return NULL; + } + + kd = kmalloc(sizeof(*kd), GFP_KERNEL); + if (!kd) + return NULL; + kd->keymap_size = proplen / sizeof(u32); + + keymap = kzalloc(kd->keymap_size * sizeof(u32), GFP_KERNEL); + if (!keymap) { + kfree(kd); + return NULL; + } + + kd->keymap = keymap; + + for (i = 0; i < kd->keymap_size; i++) { + u32 tmp = be32_to_cpup(prop+i); + int key_code, row, col; + + row = (tmp >> 24) & 0xff; + col = (tmp >> 16) & 0xff; + key_code = tmp & 0xffff; + *keymap++ = KEY(row, col, key_code); + } + + /* FIXME: Need to add handling of the linux,fn-keymap property here */ + + return kd; +} +EXPORT_SYMBOL_GPL(matrix_keyboard_of_fill_keymap); + +void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd) +{ + if (!kd) + return; + kfree(kd->keymap); + kfree(kd); +} +EXPORT_SYMBOL_GPL(matrix_keyboard_of_free_keymap); diff --git a/include/linux/input/matrix_keypad.h b/include/linux/input/matrix_keypad.h index fe7c4b9..fcf45ec 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 +107,22 @@ matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data, __clear_bit(KEY_RESERVED, keybit); } +#ifdef CONFIG_INPUT_OF_MATRIX_KEYMAP +struct matrix_keymap_data * +matrix_keyboard_of_fill_keymap(struct device_node *np); + +void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd); +#else +static inline struct matrix_keymap_data * +matrix_keyboard_of_fill_keymap(struct device_node *np) +{ + return NULL; +} + +static inline void +matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd) +{ +} +#endif + #endif /* _MATRIX_KEYPAD_H */ -- 1.7.8.GIT _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
