diff options
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/Makefile | 3 | ||||
| -rw-r--r-- | drivers/input/input.c | 430 | ||||
| -rw-r--r-- | drivers/input/key_matrix.c | 208 | ||||
| -rw-r--r-- | drivers/input/tegra-kbc.c | 375 |
4 files changed, 1016 insertions, 0 deletions
diff --git a/drivers/input/Makefile b/drivers/input/Makefile index 1f4dad3..5c831b2 100644 --- a/drivers/input/Makefile +++ b/drivers/input/Makefile @@ -26,10 +26,13 @@ include $(TOPDIR)/config.mk LIB := $(obj)libinput.o COBJS-$(CONFIG_I8042_KBD) += i8042.o +COBJS-$(CONFIG_TEGRA2_KEYBOARD) += tegra-kbc.o ifdef CONFIG_PS2KBD COBJS-y += keyboard.o pc_keyb.o COBJS-$(CONFIG_PS2MULT) += ps2mult.o ps2ser.o endif +COBJS-y += input.o +COBJS-$(CONFIG_OF_CONTROL) += key_matrix.o COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/input/input.c b/drivers/input/input.c new file mode 100644 index 0000000..4eadd77 --- /dev/null +++ b/drivers/input/input.c @@ -0,0 +1,430 @@ +/* + * Translate key codes into ASCII + * + * Copyright (c) 2011 The Chromium OS Authors. + * (C) Copyright 2004 DENX Software Engineering, Wolfgang Denk, wd@denx.de + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <stdio_dev.h> +#include <input.h> +#include <linux/input.h> + +enum { + /* These correspond to the lights on the keyboard */ + FLAG_NUM_LOCK = 1 << 0, + FLAG_CAPS_LOCK = 1 << 1, + FLAG_SCROLL_LOCK = 1 << 2, + + /* Special flag ORed with key code to indicate release */ + KEY_RELEASE = 1 << 15, + KEY_MASK = 0xfff, +}; + +/* + * These takes map key codes to ASCII. 0xff means no key, or special key. + * Three tables are provided - one for plain keys, one for when the shift + * 'modifier' key is pressed and one for when the ctrl modifier key is + * pressed. + */ +static const uchar kbd_plain_xlate[] = { + 0xff, 0x1b, '1', '2', '3', '4', '5', '6', + '7', '8', '9', '0', '-', '=', '\b', '\t', /* 0x00 - 0x0f */ + 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', + 'o', 'p', '[', ']', '\r', 0xff, 'a', 's', /* 0x10 - 0x1f */ + 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', + '\'', '`', 0xff, '\\', 'z', 'x', 'c', 'v', /* 0x20 - 0x2f */ + 'b', 'n', 'm', ',' , '.', '/', 0xff, 0xff, 0xff, + ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x30 - 0x3f */ + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7', + '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */ + '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */ + '\r', 0xff, 0xff +}; + +static unsigned char kbd_shift_xlate[] = { + 0xff, 0x1b, '!', '@', '#', '$', '%', '^', + '&', '*', '(', ')', '_', '+', '\b', '\t', /* 0x00 - 0x0f */ + 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', + 'O', 'P', '{', '}', '\r', 0xff, 'A', 'S', /* 0x10 - 0x1f */ + 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', + '"', '~', 0xff, '|', 'Z', 'X', 'C', 'V', /* 0x20 - 0x2f */ + 'B', 'N', 'M', '<', '>', '?', 0xff, 0xff, 0xff, + ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x30 - 0x3f */ + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7', + '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */ + '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */ + '\r', 0xff, 0xff +}; + +static unsigned char kbd_ctrl_xlate[] = { + 0xff, 0x1b, '1', 0x00, '3', '4', '5', 0x1E, + '7', '8', '9', '0', 0x1F, '=', '\b', '\t', /* 0x00 - 0x0f */ + 0x11, 0x17, 0x05, 0x12, 0x14, 0x18, 0x15, 0x09, + 0x0f, 0x10, 0x1b, 0x1d, '\n', 0xff, 0x01, 0x13, /* 0x10 - 0x1f */ + 0x04, 0x06, 0x08, 0x09, 0x0a, 0x0b, 0x0c, ';', + '\'', '~', 0x00, 0x1c, 0x1a, 0x18, 0x03, 0x16, /* 0x20 - 0x2f */ + 0x02, 0x0e, 0x0d, '<', '>', '?', 0xff, 0xff, + 0xff, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x30 - 0x3f */ + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7', + '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */ + '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */ + '\r', 0xff, 0xff +}; + + +int input_queue_ascii(struct input_config *config, int ch) +{ + if (config->fifo_in + 1 == INPUT_BUFFER_LEN) { + if (!config->fifo_out) + return -1; /* buffer full */ + else + config->fifo_in = 0; + } else { + if (config->fifo_in + 1 == config->fifo_out) + return -1; /* buffer full */ + config->fifo_in++; + } + config->fifo[config->fifo_in] = (uchar)ch; + + return 0; +} + +int input_tstc(struct input_config *config) +{ + if (config->fifo_in == config->fifo_out && config->read_keys) { + if (!(*config->read_keys)(config)) + return 0; + } + return config->fifo_in != config->fifo_out; +} + +int input_getc(struct input_config *config) +{ + int err = 0; + + while (config->fifo_in == config->fifo_out) { + if (config->read_keys) + err = (*config->read_keys)(config); + if (err) + return -1; + } + + if (++config->fifo_out == INPUT_BUFFER_LEN) + config->fifo_out = 0; + + return config->fifo[config->fifo_out]; +} + +/** + * Process a modifier/special key press or release and decide which key + * translation array should be used as a result. + * + * TODO: Should keep track of modifier press/release + * + * @param config Input state + * @param key Key code to process + * @param release 0 if a press, 1 if a release + * @return pointer to keycode->ascii translation table that should be used + */ +static struct input_key_xlate *process_modifier(struct input_config *config, + int key, int release) +{ + struct input_key_xlate *table; + int flip = -1; + int i; + + /* Start with the main table, and see what modifiers change it */ + assert(config->num_tables > 0); + table = &config->table[0]; + for (i = 1; i < config->num_tables; i++) { + struct input_key_xlate *tab = &config->table[i]; + + if (key == tab->left_keycode || key == tab->right_keycode) + table = tab; + } + + /* Handle the lighted keys */ + if (!release) { + switch (key) { + case KEY_SCROLLLOCK: + flip = FLAG_SCROLL_LOCK; + break; + case KEY_NUMLOCK: + flip = FLAG_NUM_LOCK; + break; + case KEY_CAPSLOCK: + flip = FLAG_CAPS_LOCK; + break; + } + } + + if (flip != -1) { + int leds = 0; + + config->leds ^= flip; + if (config->flags & FLAG_NUM_LOCK) + leds |= INPUT_LED_NUM; + if (config->flags & FLAG_CAPS_LOCK) + leds |= INPUT_LED_CAPS; + if (config->flags & FLAG_SCROLL_LOCK) + leds |= INPUT_LED_SCROLL; + config->leds = leds; + } + + return table; +} + +/** + * Search an int array for a key value + * + * @param array Array to search + * @param count Number of elements in array + * @param key Key value to find + * @return element where value was first found, -1 if none + */ +static int array_search(int *array, int count, int key) +{ + int i; + + for (i = 0; i < count; i++) { + if (array[i] == key) + return i; + } + + return -1; +} + +/** + * Sort an array so that those elements that exist in the ordering are + * first in the array, and in the same order as the ordering. The algorithm + * is O(count * ocount) and designed for small arrays. + * + * TODO: Move this to common / lib? + * + * @param dest Array with elements to sort, also destination array + * @param count Number of elements to sort + * @param order Array containing ordering elements + * @param ocount Number of ordering elements + * @return number of elements in dest that are in order (these will be at the + * start of dest). + */ +static int sort_array_by_ordering(int *dest, int count, int *order, + int ocount) +{ + int temp[count]; + int dest_count; + int same; /* number of elements which are the same */ + int i; + + /* setup output items, copy items to be sorted into our temp area */ + memcpy(temp, dest, count * sizeof(*dest)); + dest_count = 0; + + /* work through the ordering, move over the elements we agree on */ + for (i = 0; i < ocount; i++) { + if (array_search(temp, count, order[i]) != -1) + dest[dest_count++] = order[i]; + } + same = dest_count; + + /* now move over the elements that are not in the ordering */ + for (i = 0; i < count; i++) { + if (array_search(order, ocount, temp[i]) == -1) + dest[dest_count++] = temp[i]; + } + assert(dest_count == count); + return same; +} + +/** + * Check a list of key codes against the previous key scan + * + * Given a list of new key codes, we check how many of these are the same + * as last time. + * + * @param config Input state + * @param keycode List of key codes to examine + * @param num_keycodes Number of key codes + * @param same Returns number of key codes which are the same + */ +static int input_check_keycodes(struct input_config *config, + int keycode[], int num_keycodes, int *same) +{ + /* Select the 'plain' xlate table to start with */ + if (!config->num_tables) { + debug("%s: No xlate tables: cannot decode keys\n", __func__); + return -1; + } + + /* sort the keycodes into the same order as the previous ones */ + *same = sort_array_by_ordering(keycode, num_keycodes, + config->prev_keycodes, config->num_prev_keycodes); + + memcpy(config->prev_keycodes, keycode, num_keycodes * sizeof(int)); + config->num_prev_keycodes = num_keycodes; + + return *same != num_keycodes; +} + +/** + * Convert a list of key codes into ASCII + * + * You must call input_check_keycodes() before this. It turns the keycode + * list into a list of ASCII characters which are ready to send to the + * input layer. + * + * Characters which were seen last time do not generate fresh ASCII output. + * + * @param config Input state + * @param keycode List of key codes to examine + * @param num_keycodes Number of key codes + * @param same Number of key codes which are the same + */ +static int input_keycodes_to_ascii(struct input_config *config, + int keycode[], int num_keycodes, char output_ch[], int same) +{ + struct input_key_xlate *table; + int ch_count; + int i; + + table = &config->table[0]; + + /* deal with modifiers first */ + for (i = 0; i < num_keycodes; i++) { + int key = keycode[i] & KEY_MASK; + + if (key >= table->num_entries || table->xlate[key] == 0xff) { + table = process_modifier(config, key, + keycode[i] & KEY_RELEASE); + } + } + + /* now find normal keys */ + for (i = ch_count = 0; i < num_keycodes; i++) { + int key = keycode[i]; + + if (key < table->num_entries && i >= same) { + int ch = table->xlate[key]; + + /* If a normal key with an ASCII value, add it! */ + if (ch != 0xff) + output_ch[ch_count++] = (uchar)ch; + } + } + + /* ok, so return keys */ + return ch_count; +} + +int input_send_keycodes(struct input_config *config, + int keycode[], int num_keycodes) +{ + char ch[num_keycodes]; + int count, i, same = 0; + int is_repeat = 0; + unsigned delay_ms; + + config->modifiers = 0; + if (!input_check_keycodes(config, keycode, num_keycodes, &same)) { + /* + * Same as last time - is it time for another repeat? + * TODO(sjg@chromium.org) We drop repeats here and since + * the caller may not call in again for a while, our + * auto-repeat speed is not quite correct. We should + * insert another character if we later realise that we + * have missed a repeat slot. + */ + is_repeat = (int)get_timer(config->next_repeat_ms) >= 0; + if (!is_repeat) + return 0; + } + + count = input_keycodes_to_ascii(config, keycode, num_keycodes, + ch, is_repeat ? 0 : same); + for (i = 0; i < count; i++) + input_queue_ascii(config, ch[i]); + delay_ms = is_repeat ? + config->repeat_rate_ms : + config->repeat_delay_ms; + + config->next_repeat_ms = get_timer(0) + delay_ms; + return 0; +} + +int input_add_table(struct input_config *config, int left_keycode, + int right_keycode, const uchar *xlate, int num_entries) +{ + struct input_key_xlate *table; + + if (config->num_tables == INPUT_MAX_MODIFIERS) { + debug("%s: Too many modifier tables\n", __func__); + return -1; + } + + table = &config->table[config->num_tables++]; + table->left_keycode = left_keycode; + table->right_keycode = right_keycode; + table->xlate = xlate; + table->num_entries = num_entries; + + return 0; +} + +int input_init(struct input_config *config, int leds, int repeat_delay_ms, + int repeat_rate_ms) +{ + memset(config, '\0', sizeof(*config)); + config->leds = leds; + config->repeat_delay_ms = repeat_delay_ms; + config->repeat_rate_ms = repeat_rate_ms; + if (input_add_table(config, -1, -1, + kbd_plain_xlate, ARRAY_SIZE(kbd_plain_xlate)) || + input_add_table(config, KEY_LEFTSHIFT, KEY_RIGHTSHIFT, + kbd_shift_xlate, ARRAY_SIZE(kbd_shift_xlate)) || + input_add_table(config, KEY_LEFTCTRL, KEY_RIGHTCTRL, + kbd_ctrl_xlate, ARRAY_SIZE(kbd_ctrl_xlate))) { + debug("%s: Could not add modifier tables\n", __func__); + return -1; + } + + return 0; +} + +int input_stdio_register(struct stdio_dev *dev) +{ + int error; + + error = stdio_register(dev); + + /* check if this is the standard input device */ + if (!error && strcmp(getenv("stdin"), dev->name) == 0) { + /* reassign the console */ + if (OVERWRITE_CONSOLE || + console_assign(stdin, dev->name)) + return -1; + } + + return 0; +} diff --git a/drivers/input/key_matrix.c b/drivers/input/key_matrix.c new file mode 100644 index 0000000..84b898f --- /dev/null +++ b/drivers/input/key_matrix.c @@ -0,0 +1,208 @@ +/* + * Manage Keyboard Matrices + * + * Copyright (c) 2012 The Chromium OS Authors. + * (C) Copyright 2004 DENX Software Engineering, Wolfgang Denk, wd@denx.de + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <fdtdec.h> +#include <key_matrix.h> +#include <malloc.h> +#include <linux/input.h> + +/** + * Determine if the current keypress configuration can cause key ghosting + * + * We figure this out by seeing if we have two or more keys in the same + * column, as well as two or more keys in the same row. + * + * @param config Keyboard matrix config + * @param keys List of keys to check + * @param valid Number of valid keypresses to check + * @return 0 if no ghosting is possible, 1 if it is + */ +static int has_ghosting(struct key_matrix *config, struct key_matrix_key *keys, + int valid) +{ + int key_in_same_col = 0, key_in_same_row = 0; + int i, j; + + for (i = 0; i < valid; i++) { + /* + * Find 2 keys such that one key is in the same row + * and the other is in the same column as the i-th key. + */ + for (j = i + 1; j < valid; j++) { + if (keys[j].col == keys[i].col) + key_in_same_col = 1; + if (keys[j].row == keys[i].row) + key_in_same_row = 1; + } + } + + if (key_in_same_col && key_in_same_row) + return 1; + else + return 0; +} + +int key_matrix_decode(struct key_matrix *config, struct key_matrix_key keys[], + int num_keys, int keycode[], int max_keycodes) +{ + const u8 *keymap; + int valid, upto; + int pos; + + debug("%s: num_keys = %d\n", __func__, num_keys); + keymap = config->plain_keycode; + for (valid = upto = 0; upto < num_keys; upto++) { + struct key_matrix_key *key = &keys[upto]; + + debug(" valid=%d, row=%d, col=%d\n", key->valid, key->row, + key->col); + if (!key->valid) + continue; + pos = key->row * config->num_cols + key->col; + if (config->fn_keycode && pos == config->fn_pos) + keymap = config->fn_keycode; + + /* Convert the (row, col) values into a keycode */ + if (valid < max_keycodes) + keycode[valid++] = keymap[pos]; + debug(" keycode=%d\n", keymap[pos]); + } + + /* For a ghost key config, ignore the keypresses for this iteration. */ + if (valid >= 3 && has_ghosting(config, keys, valid)) { + valid = 0; + debug(" ghosting detected!\n"); + } + debug(" %d valid keycodes found\n", valid); + + return valid; +} + +/** + * Create a new keycode map from some provided data + * + * This decodes a keycode map in the format used by the fdt, which is one + * word per entry, with the row, col and keycode encoded in that word. + * + * We create a (row x col) size byte array with each entry containing the + * keycode for that (row, col). We also search for map_keycode and return + * its position if found (this is used for finding the Fn key). + * + * @param config Key matrix dimensions structure + * @param data Keycode data + * @param len Number of entries in keycode table + * @param map_keycode Key code to find in the map + * @param pos Returns position of map_keycode, if found, else -1 + * @return map Pointer to allocated map + */ +static uchar *create_keymap(struct key_matrix *config, u32 *data, int len, + int map_keycode, int *pos) +{ + uchar *map; + + if (pos) + *pos = -1; + map = (uchar *)calloc(1, config->key_count); + if (!map) { + debug("%s: failed to malloc %d bytes\n", __func__, + config->key_count); + return NULL; + } + + for (; len >= sizeof(u32); data++, len -= 4) { + u32 tmp = fdt32_to_cpu(*data); + int key_code, row, col; + int entry; + + row = (tmp >> 24) & 0xff; + col = (tmp >> 16) & 0xff; + key_code = tmp & 0xffff; + entry = row * config->num_cols + col; + map[entry] = key_code; + if (pos && map_keycode == key_code) + *pos = entry; + } + + return map; +} + +int key_matrix_decode_fdt(struct key_matrix *config, const void *blob, + int node) +{ + const struct fdt_property *prop; + int offset; + + /* Check each property name for ones that we understand */ + for (offset = fdt_first_property_offset(blob, node); + offset > 0; + offset = fdt_next_property_offset(blob, offset)) { + const char *name; + int len; + + prop = fdt_get_property_by_offset(blob, offset, NULL); + name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); + len = strlen(name); + + /* Name needs to match "1,<type>keymap" */ + debug("%s: property '%s'\n", __func__, name); + if (strncmp(name, "1,", 2) || len < 8 || + strcmp(name + len - 6, "keymap")) + continue; + + len -= 8; + if (len == 0) { + config->plain_keycode = create_keymap(config, + (u32 *)prop->data, fdt32_to_cpu(prop->len), + KEY_FN, &config->fn_pos); + } else if (0 == strncmp(name + 2, "fn-", len)) { + config->fn_keycode = create_keymap(config, + (u32 *)prop->data, fdt32_to_cpu(prop->len), + -1, NULL); + } else { + debug("%s: unrecognised property '%s'\n", __func__, + name); + } + } + debug("%s: Decoded key maps %p, %p from fdt\n", __func__, + config->plain_keycode, config->fn_keycode); + + if (!config->plain_keycode) { + debug("%s: cannot find keycode-plain map\n", __func__); + return -1; + } + + return 0; +} + +int key_matrix_init(struct key_matrix *config, int rows, int cols) +{ + memset(config, '\0', sizeof(*config)); + config->num_rows = rows; + config->num_cols = cols; + config->key_count = rows * cols; + assert(config->key_count > 0); + + return 0; +} diff --git a/drivers/input/tegra-kbc.c b/drivers/input/tegra-kbc.c new file mode 100644 index 0000000..f164791 --- /dev/null +++ b/drivers/input/tegra-kbc.c @@ -0,0 +1,375 @@ +/* + * (C) Copyright 2011 + * NVIDIA Corporation <www.nvidia.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <fdtdec.h> +#include <input.h> +#include <key_matrix.h> +#include <stdio_dev.h> +#include <tegra-kbc.h> +#include <asm/io.h> +#include <asm/arch/clock.h> +#include <asm/arch/funcmux.h> +#include <asm/arch/timer.h> +#include <linux/input.h> + +DECLARE_GLOBAL_DATA_PTR; + +enum { + KBC_MAX_GPIO = 24, + KBC_MAX_KPENT = 8, /* size of keypress entry queue */ +}; + +#define KBC_FIFO_TH_CNT_SHIFT 14 +#define KBC_DEBOUNCE_CNT_SHIFT 4 +#define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3) +#define KBC_CONTROL_KBC_EN (1 << 0) +#define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2) +#define KBC_KPENT_VALID (1 << 7) +#define KBC_ST_STATUS (1 << 3) + +enum { + KBC_DEBOUNCE_COUNT = 2, + KBC_REPEAT_RATE_MS = 30, + KBC_REPEAT_DELAY_MS = 240, + KBC_CLOCK_KHZ = 32, /* Keyboard uses a 32KHz clock */ +}; + +/* keyboard controller config and state */ +static struct keyb { + struct input_config input; /* The input layer */ + struct key_matrix matrix; /* The key matrix layer */ + + struct kbc_tegra *kbc; /* tegra keyboard controller */ + unsigned char inited; /* 1 if keyboard has been inited */ + unsigned char first_scan; /* 1 if this is our first key scan */ + + /* + * After init we must wait a short time before polling the keyboard. + * This gives the tegra keyboard controller time to react after reset + * and lets us grab keys pressed during reset. + */ + unsigned int init_dly_ms; /* Delay before we can read keyboard */ + unsigned int start_time_ms; /* Time that we inited (in ms) */ + unsigned int last_poll_ms; /* Time we should last polled */ + unsigned int next_repeat_ms; /* Next time we repeat a key */ +} config; + +/** + * reads the keyboard fifo for current keypresses + * + * @param config Keyboard config + * @param fifo Place to put fifo results + * @param max_keycodes Maximum number of key codes to put in the fifo + * @return number of items put into fifo + */ +static int tegra_kbc_find_keys(struct keyb *config, int *fifo, + int max_keycodes) +{ + struct key_matrix_key keys[KBC_MAX_KPENT], *key; + u32 kp_ent = 0; + int i; + + for (key = keys, i = 0; i < KBC_MAX_KPENT; i++, key++) { + /* Get next word */ + if (!(i & 3)) + kp_ent = readl(&config->kbc->kp_ent[i / 4]); + + key->valid = (kp_ent & KBC_KPENT_VALID) != 0; + key->row = (kp_ent >> 3) & 0xf; + key->col = kp_ent & 0x7; + + /* Shift to get next entry */ + kp_ent >>= 8; + } + return key_matrix_decode(&config->matrix, keys, KBC_MAX_KPENT, fifo, + max_keycodes); +} + +/** + * Process all the keypress sequences in fifo and send key codes + * + * The fifo contains zero or more keypress sets. Each set + * consists of from 1-8 keycodes, representing the keycodes which + * were simultaneously pressed during that scan. + * + * This function works through each set and generates ASCII characters + * for each. Not that one set may produce more than one ASCII characters - + * for example holding down 'd' and 'f' at the same time will generate + * two ASCII characters. + * + * Note: if fifo_cnt is 0, we will tell the input layer that no keys are + * pressed. + * + * @param config Keyboard config + * @param fifo_cnt Number of entries in the keyboard fifo + */ +static void process_fifo(struct keyb *config, int fifo_cnt) +{ + int fifo[KBC_MAX_KPENT]; + int cnt = 0; + + /* Always call input_send_keycodes() at least once */ + do { + if (fifo_cnt) + cnt = tegra_kbc_find_keys(config, fifo, KBC_MAX_KPENT); + + input_send_keycodes(&config->input, fifo, cnt); + } while (--fifo_cnt > 0); +} + +/** + * Check the keyboard controller and emit ASCII characters for any keys that + * are pressed. + * + * @param config Keyboard config + */ +static void check_for_keys(struct keyb *config) +{ + int fifo_cnt; + + if (!config->first_scan && + get_timer(config->last_poll_ms) < KBC_REPEAT_RATE_MS) + return; + config->last_poll_ms = get_timer(0); + config->first_scan = 0; + + /* + * Once we get here we know the keyboard has been scanned. So if there + * scan waiting for us, we know that nothing is held down. + */ + fifo_cnt = (readl(&config->kbc->interrupt) >> 4) & 0xf; + process_fifo(config, fifo_cnt); +} + +/** + * In order to detect keys pressed on boot, wait for the hardware to + * complete scanning the keys. This includes time to transition from + * Wkup mode to Continous polling mode and the repoll time. We can + * deduct the time that's already elapsed. + * + * @param config Keyboard config + */ +static void kbd_wait_for_fifo_init(struct keyb *config) +{ + if (!config->inited) { + unsigned long elapsed_time; + long delay_ms; + + elapsed_time = get_timer(config->start_time_ms); + delay_ms = config->init_dly_ms - elapsed_time; + if (delay_ms > 0) { + udelay(delay_ms * 1000); + debug("%s: delay %ldms\n", __func__, delay_ms); + } + + config->inited = 1; + } +} + +/** + * Check the tegra keyboard, and send any keys that are pressed. + * + * This is called by input_tstc() and input_getc() when they need more + * characters + * + * @param input Input configuration + * @return 1, to indicate that we have something to look at + */ +int tegra_kbc_check(struct input_config *input) +{ + kbd_wait_for_fifo_init(&config); + check_for_keys(&config); + + return 1; +} + +/** + * Test if keys are available to be read + * + * @return 0 if no keys available, 1 if keys are available + */ +static int kbd_tstc(void) +{ + /* Just get input to do this for us */ + return input_tstc(&config.input); +} + +/** + * Read a key + * + * TODO: U-Boot wants 0 for no key, but Ctrl-@ is a valid key... + * + * @return ASCII key code, or 0 if no key, or -1 if error + */ +static int kbd_getc(void) +{ + /* Just get input to do this for us */ + return input_getc(&config.input); +} + +/* configures keyboard GPIO registers to use the rows and columns */ +static void config_kbc_gpio(struct kbc_tegra *kbc) +{ + int i; + + for (i = 0; i < KBC_MAX_GPIO; i++) { + u32 row_cfg, col_cfg; + u32 r_shift = 5 * (i % 6); + u32 c_shift = 4 * (i % 8); + u32 r_mask = 0x1f << r_shift; + u32 c_mask = 0xf << c_shift; + u32 r_offs = i / 6; + u32 c_offs = i / 8; + + row_cfg = readl(&kbc->row_cfg[r_offs]); + col_cfg = readl(&kbc->col_cfg[c_offs]); + + row_cfg &= ~r_mask; + col_cfg &= ~c_mask; + + if (i < config.matrix.num_rows) { + row_cfg |= ((i << 1) | 1) << r_shift; + } else { + col_cfg |= (((i - config.matrix.num_rows) << 1) | 1) + << c_shift; + } + + writel(row_cfg, &kbc->row_cfg[r_offs]); + writel(col_cfg, &kbc->col_cfg[c_offs]); + } +} + +/** + * Start up the keyboard device + */ +static void tegra_kbc_open(void) +{ + struct kbc_tegra *kbc = config.kbc; + unsigned int scan_period; + u32 val; + + /* + * We will scan at twice the keyboard repeat rate, so that there is + * always a scan ready when we check it in check_for_keys(). + */ + scan_period = KBC_REPEAT_RATE_MS / 2; + writel(scan_period * KBC_CLOCK_KHZ, &kbc->rpt_dly); + writel(scan_period * KBC_CLOCK_KHZ, &kbc->init_dly); + /* + * Before reading from the keyboard we must wait for the init_dly + * plus the rpt_delay, plus 2ms for the row scan time. + */ + config.init_dly_ms = scan_period * 2 + 2; + + val = KBC_DEBOUNCE_COUNT << KBC_DEBOUNCE_CNT_SHIFT; + val |= 1 << KBC_FIFO_TH_CNT_SHIFT; /* fifo interrupt threshold */ + val |= KBC_CONTROL_KBC_EN; /* enable */ + writel(val, &kbc->control); + + config.start_time_ms = get_timer(0); + config.last_poll_ms = config.next_repeat_ms = get_timer(0); + config.first_scan = 1; +} + +/** + * Set up the tegra keyboard. This is called by the stdio device handler + * + * We want to do this init when the keyboard is actually used rather than + * at start-up, since keyboard input may not currently be selected. + * + * Once the keyboard starts there will be a period during which we must + * wait for the keyboard to init. We do this only when a key is first + * read - see kbd_wait_for_fifo_init(). + * + * @return 0 if ok, -ve on error + */ +static int init_tegra_keyboard(void) +{ +#ifdef CONFIG_OF_CONTROL + int node; + + node = fdtdec_next_compatible(gd->fdt_blob, 0, + COMPAT_NVIDIA_TEGRA20_KBC); + if (node < 0) { + debug("%s: cannot locate keyboard node\n", __func__); + return node; + } + config.kbc = (struct kbc_tegra *)fdtdec_get_addr(gd->fdt_blob, + node, "reg"); + if ((fdt_addr_t)config.kbc == FDT_ADDR_T_NONE) { + debug("%s: No keyboard register found\n", __func__); + return -1; + } + + /* Decode the keyboard matrix information (16 rows, 8 columns) */ + if (key_matrix_init(&config.matrix, 16, 8)) { + debug("%s: Could not init key matrix\n", __func__); + return -1; + } + if (key_matrix_decode_fdt(&config.matrix, gd->fdt_blob, node)) { + debug("%s: Could not decode key matrix from fdt\n", __func__); + return -1; + } + if (config.matrix.fn_keycode) { + if (input_add_table(&config.input, KEY_FN, -1, + config.matrix.fn_keycode, + config.matrix.key_count)) + return -1; + } +#else +#error "Tegra keyboard driver requires FDT definitions" +#endif + + /* Set up pin mux and enable the clock */ + funcmux_select(PERIPH_ID_KBC, FUNCMUX_DEFAULT); + clock_enable(PERIPH_ID_KBC); + config_kbc_gpio(config.kbc); + + tegra_kbc_open(); + debug("%s: Tegra keyboard ready\n", __func__); + + return 0; +} + +int drv_keyboard_init(void) +{ + struct stdio_dev dev; + + if (input_init(&config.input, 0, KBC_REPEAT_DELAY_MS, + KBC_REPEAT_RATE_MS)) { + debug("%s: Cannot set up input\n", __func__); + return -1; + } + config.input.read_keys = tegra_kbc_check; + + memset(&dev, '\0', sizeof(dev)); + strcpy(dev.name, "tegra-kbc"); + dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; + dev.getc = kbd_getc; + dev.tstc = kbd_tstc; + dev.start = init_tegra_keyboard; + + /* Register the device. init_tegra_keyboard() will be called soon */ + return input_stdio_register(&dev); +} |