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202 lines
5.3 KiB
202 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Helpers for matrix keyboard bindings |
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* |
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* Copyright (C) 2012 Google, Inc |
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* |
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* Author: |
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* Olof Johansson <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/export.h> |
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#include <linux/gfp.h> |
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#include <linux/input.h> |
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#include <linux/input/matrix_keypad.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/property.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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static bool matrix_keypad_map_key(struct input_dev *input_dev, |
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unsigned int rows, unsigned int cols, |
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unsigned int row_shift, unsigned int key) |
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{ |
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unsigned short *keymap = input_dev->keycode; |
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unsigned int row = KEY_ROW(key); |
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unsigned int col = KEY_COL(key); |
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unsigned short code = KEY_VAL(key); |
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if (row >= rows || col >= cols) { |
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dev_err(input_dev->dev.parent, |
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"%s: invalid keymap entry 0x%x (row: %d, col: %d, rows: %d, cols: %d)\n", |
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__func__, key, row, col, rows, cols); |
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return false; |
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} |
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keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code; |
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__set_bit(code, input_dev->keybit); |
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return true; |
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} |
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/** |
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* matrix_keypad_parse_properties() - Read properties of matrix keypad |
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* |
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* @dev: Device containing properties |
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* @rows: Returns number of matrix rows |
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* @cols: Returns number of matrix columns |
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* @return 0 if OK, <0 on error |
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*/ |
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int matrix_keypad_parse_properties(struct device *dev, |
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unsigned int *rows, unsigned int *cols) |
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{ |
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*rows = *cols = 0; |
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device_property_read_u32(dev, "keypad,num-rows", rows); |
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device_property_read_u32(dev, "keypad,num-columns", cols); |
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if (!*rows || !*cols) { |
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dev_err(dev, "number of keypad rows/columns not specified\n"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(matrix_keypad_parse_properties); |
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static int matrix_keypad_parse_keymap(const char *propname, |
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unsigned int rows, unsigned int cols, |
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struct input_dev *input_dev) |
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{ |
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struct device *dev = input_dev->dev.parent; |
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unsigned int row_shift = get_count_order(cols); |
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unsigned int max_keys = rows << row_shift; |
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u32 *keys; |
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int i; |
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int size; |
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int retval; |
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if (!propname) |
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propname = "linux,keymap"; |
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size = device_property_count_u32(dev, propname); |
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if (size <= 0) { |
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dev_err(dev, "missing or malformed property %s: %d\n", |
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propname, size); |
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return size < 0 ? size : -EINVAL; |
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} |
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if (size > max_keys) { |
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dev_err(dev, "%s size overflow (%d vs max %u)\n", |
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propname, size, max_keys); |
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return -EINVAL; |
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} |
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keys = kmalloc_array(size, sizeof(u32), GFP_KERNEL); |
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if (!keys) |
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return -ENOMEM; |
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retval = device_property_read_u32_array(dev, propname, keys, size); |
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if (retval) { |
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dev_err(dev, "failed to read %s property: %d\n", |
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propname, retval); |
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goto out; |
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} |
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for (i = 0; i < size; i++) { |
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if (!matrix_keypad_map_key(input_dev, rows, cols, |
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row_shift, keys[i])) { |
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retval = -EINVAL; |
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goto out; |
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} |
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} |
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retval = 0; |
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out: |
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kfree(keys); |
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return retval; |
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} |
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/** |
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* matrix_keypad_build_keymap - convert platform keymap into matrix keymap |
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* @keymap_data: keymap supplied by the platform code |
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* @keymap_name: name of device tree property containing keymap (if device |
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* tree support is enabled). |
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* @rows: number of rows in target keymap array |
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* @cols: number of cols in target keymap array |
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* @keymap: expanded version of keymap that is suitable for use by |
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* matrix keyboard driver |
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* @input_dev: input devices for which we are setting up the keymap |
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* |
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* This function converts platform keymap (encoded with KEY() macro) into |
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* an array of keycodes that is suitable for using in a standard matrix |
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* keyboard driver that uses row and col as indices. |
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* |
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* If @keymap_data is not supplied and device tree support is enabled |
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* it will attempt load the keymap from property specified by @keymap_name |
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* argument (or "linux,keymap" if @keymap_name is %NULL). |
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* |
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* If @keymap is %NULL the function will automatically allocate managed |
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* block of memory to store the keymap. This memory will be associated with |
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* the parent device and automatically freed when device unbinds from the |
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* driver. |
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* |
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* Callers are expected to set up input_dev->dev.parent before calling this |
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* function. |
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*/ |
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int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data, |
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const char *keymap_name, |
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unsigned int rows, unsigned int cols, |
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unsigned short *keymap, |
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struct input_dev *input_dev) |
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{ |
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unsigned int row_shift = get_count_order(cols); |
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size_t max_keys = rows << row_shift; |
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int i; |
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int error; |
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if (WARN_ON(!input_dev->dev.parent)) |
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return -EINVAL; |
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if (!keymap) { |
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keymap = devm_kcalloc(input_dev->dev.parent, |
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max_keys, sizeof(*keymap), |
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GFP_KERNEL); |
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if (!keymap) { |
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dev_err(input_dev->dev.parent, |
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"Unable to allocate memory for keymap"); |
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return -ENOMEM; |
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} |
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} |
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input_dev->keycode = keymap; |
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input_dev->keycodesize = sizeof(*keymap); |
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input_dev->keycodemax = max_keys; |
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__set_bit(EV_KEY, input_dev->evbit); |
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if (keymap_data) { |
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for (i = 0; i < keymap_data->keymap_size; i++) { |
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unsigned int key = keymap_data->keymap[i]; |
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if (!matrix_keypad_map_key(input_dev, rows, cols, |
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row_shift, key)) |
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return -EINVAL; |
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} |
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} else { |
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error = matrix_keypad_parse_keymap(keymap_name, rows, cols, |
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input_dev); |
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if (error) |
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return error; |
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} |
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__clear_bit(KEY_RESERVED, input_dev->keybit); |
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return 0; |
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} |
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EXPORT_SYMBOL(matrix_keypad_build_keymap); |
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MODULE_LICENSE("GPL");
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