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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197// SPDX-License-Identifier: GPL-2.0-only/* * Helpers for matrix keyboard bindings * * Copyright (C) 2012 Google, Inc * * Author: * Olof Johansson <olof@lixom.net> */
#include <linux/device.h>#include <linux/export.h>#include <linux/gfp.h>#include <linux/input.h>#include <linux/input/matrix_keypad.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/property.h>#include <linux/slab.h>#include <linux/types.h>
static bool matrix_keypad_map_key(struct input_dev *input_dev, unsigned int rows, unsigned int cols, unsigned int row_shift, unsigned int key){ unsigned short *keymap = input_dev->keycode; 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 0x%x (row: %d, col: %d, rows: %d, cols: %d)\n", __func__, key, row, col, rows, cols); return false; }
keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code; __set_bit(code, input_dev->keybit);
return true;}
/** * matrix_keypad_parse_properties() - Read properties of matrix keypad * * @dev: Device containing properties * @rows: Returns number of matrix rows * @cols: Returns number of matrix columns * @return 0 if OK, <0 on error */int matrix_keypad_parse_properties(struct device *dev, unsigned int *rows, unsigned int *cols){ *rows = *cols = 0;
device_property_read_u32(dev, "keypad,num-rows", rows); device_property_read_u32(dev, "keypad,num-columns", cols);
if (!*rows || !*cols) { dev_err(dev, "number of keypad rows/columns not specified\n"); return -EINVAL; }
return 0;}EXPORT_SYMBOL_GPL(matrix_keypad_parse_properties);
static int matrix_keypad_parse_keymap(const char *propname, unsigned int rows, unsigned int cols, struct input_dev *input_dev){ struct device *dev = input_dev->dev.parent; unsigned int row_shift = get_count_order(cols); unsigned int max_keys = rows << row_shift; int i; int size; int error;
if (!propname) propname = "linux,keymap";
size = device_property_count_u32(dev, propname); if (size <= 0) { dev_err(dev, "missing or malformed property %s: %d\n", propname, size); return size < 0 ? size : -EINVAL; }
if (size > max_keys) { dev_err(dev, "%s size overflow (%d vs max %u)\n", propname, size, max_keys); return -EINVAL; }
u32 *keys __free(kfree) = kmalloc_array(size, sizeof(*keys), GFP_KERNEL); if (!keys) return -ENOMEM;
error = device_property_read_u32_array(dev, propname, keys, size); if (error) { dev_err(dev, "failed to read %s property: %d\n", propname, error); return error; }
for (i = 0; i < size; i++) { if (!matrix_keypad_map_key(input_dev, rows, cols, row_shift, keys[i])) return -EINVAL; }
return 0;}
/** * 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. * * If @keymap_data is not supplied and device tree support is enabled * it will attempt load the keymap from property specified by @keymap_name * argument (or "linux,keymap" if @keymap_name is %NULL). * * If @keymap is %NULL the function will automatically allocate managed * block of memory to store the keymap. This memory will be associated with * the parent device and automatically freed when device unbinds from the * driver. * * Callers are expected to set up input_dev->dev.parent before calling this * function. */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); size_t max_keys = rows << row_shift; int i; int error;
if (WARN_ON(!input_dev->dev.parent)) return -EINVAL;
if (!keymap) { keymap = devm_kcalloc(input_dev->dev.parent, max_keys, sizeof(*keymap), GFP_KERNEL); if (!keymap) { dev_err(input_dev->dev.parent, "Unable to allocate memory for keymap"); return -ENOMEM; } }
input_dev->keycode = keymap; input_dev->keycodesize = sizeof(*keymap); input_dev->keycodemax = max_keys;
__set_bit(EV_KEY, input_dev->evbit);
if (keymap_data) { for (i = 0; i < keymap_data->keymap_size; i++) { unsigned int key = keymap_data->keymap[i];
if (!matrix_keypad_map_key(input_dev, rows, cols, row_shift, key)) return -EINVAL; } } else { error = matrix_keypad_parse_keymap(keymap_name, rows, cols, input_dev); if (error) return error; }
__clear_bit(KEY_RESERVED, input_dev->keybit);
return 0;}EXPORT_SYMBOL(matrix_keypad_build_keymap);
MODULE_DESCRIPTION("Helpers for matrix keyboard bindings");MODULE_LICENSE("GPL");