Input: matrix-keymap - uninline and prepare for device tree support

Change matrix-keymap helper to be out-of-line, like sparse keymap,
allow the helper perform basic keymap validation and return errors,
and prepare for device tree support.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/input/matrix-keymap.c b/drivers/input/matrix-keymap.c
new file mode 100644
index 000000000000..de7992d55da2
--- /dev/null
+++ b/drivers/input/matrix-keymap.c
@@ -0,0 +1,142 @@
+/*
+ * Helpers for 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/export.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/input/matrix_keypad.h>
+
+
+/**
+ * matrix_keypad_build_keymap - convert platform keymap into matrix keymap
+ * @keymap_data: keymap supplied by the platform code
+ * @keymap_name: name of device tree property containing keymap (if device
+ *      tree support is enabled).
+ * @rows: number of rows in target keymap array
+ * @cols: number of cols in target keymap array
+ * @keymap: expanded version of keymap that is suitable for use by
+ * matrix keyboard driver
+ * @input_dev: input devices for which we are setting up the keymap
+ *
+ * This function converts platform keymap (encoded with KEY() macro) into
+ * an array of keycodes that is suitable for using in a standard matrix
+ * keyboard driver that uses row and col as indices.
+ */
+int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
+                               const char *keymap_name,
+                               unsigned int rows, unsigned int cols,
+                               unsigned short *keymap,
+                               struct input_dev *input_dev)
+{
+        unsigned int row_shift = get_count_order(cols);
+        int i;
+
+        input_dev->keycode = keymap;
+        input_dev->keycodesize = sizeof(*keymap);
+        input_dev->keycodemax = rows << row_shift;
+
+        __set_bit(EV_KEY, input_dev->evbit);
+
+        for (i = 0; i < keymap_data->keymap_size; i++) {
+                unsigned int key = keymap_data->keymap[i];
+                unsigned int row = KEY_ROW(key);
+                unsigned int col = KEY_COL(key);
+                unsigned short code = KEY_VAL(key);
+
+                if (row >= rows || col >= cols) {
+                        dev_err(input_dev->dev.parent,
+                                "%s: invalid keymap entry %d (row: %d, col: %d, rows: %d, cols: %d)\n",
+                                __func__, i, row, col, rows, cols);
+                        return -EINVAL;
+                }
+
+                keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
+                __set_bit(code, input_dev->keybit);
+        }
+        __clear_bit(KEY_RESERVED, input_dev->keybit);
+
+        return 0;
+}
+EXPORT_SYMBOL(matrix_keypad_build_keymap);
+
+#ifdef CONFIG_OF
+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);
+#endif