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authorOlof Johansson <olof@lixom.net>2012-03-13 21:35:51 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2012-03-13 21:37:04 -0700
commit2cd36877ad1c61429e00c099b6903ebcd936ca00 (patch)
treec9f7618f3b49c2ba5516c9023ba7e5604aa6b08c /drivers/input
parentb51425becfe127e0c17a8501ffa079b37241ed11 (diff)
Input: of_keymap - add device tree bindings for simple key matrices
This adds a simple device tree binding for simple key matrix data and a helper to fill in the platform data. Signed-off-by: Olof Johansson <olof@lixom.net> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/Kconfig4
-rw-r--r--drivers/input/Makefile1
-rw-r--r--drivers/input/keyboard/Kconfig1
-rw-r--r--drivers/input/of_keymap.c87
4 files changed, 93 insertions, 0 deletions
diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index 001b147c7f9..33259798081 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 0c789490e0b..b173a13a73c 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 cdc385b2cf7..3371954c979 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 00000000000..061493d5768
--- /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 <olof@lixom.net>
+ *
+ * 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,
+ const char *propname)
+{
+ struct matrix_keymap_data *kd;
+ u32 *keymap;
+ int proplen, i;
+ const __be32 *prop;
+
+ if (!np)
+ return NULL;
+
+ if (!propname)
+ propname = "linux,keymap";
+
+ prop = of_get_property(np, propname, &proplen);
+ if (!prop)
+ return NULL;
+
+ if (proplen % sizeof(u32)) {
+ pr_warn("Malformed keymap property %s in %s\n",
+ propname, np->full_name);
+ return NULL;
+ }
+
+ kd = kzalloc(sizeof(*kd), GFP_KERNEL);
+ if (!kd)
+ return NULL;
+
+ kd->keymap = keymap = kzalloc(proplen, GFP_KERNEL);
+ if (!kd->keymap) {
+ kfree(kd);
+ return NULL;
+ }
+
+ kd->keymap_size = proplen / sizeof(u32);
+
+ 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[i] = KEY(row, col, key_code);
+ }
+
+ return kd;
+}
+EXPORT_SYMBOL_GPL(matrix_keyboard_of_fill_keymap);
+
+void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd)
+{
+ if (kd) {
+ kfree(kd->keymap);
+ kfree(kd);
+ }
+}
+EXPORT_SYMBOL_GPL(matrix_keyboard_of_free_keymap);