mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-19 16:38:53 +09:00
![Simon Glass](/assets/img/avatar_default.png)
The U-Boot device trees are slightly different in a few places. Adjust them to remove most of the differences. Note that U-Boot does not support the concept of interrupts as distinct from GPIOs, so this difference remains. For sandbox, use the same keyboard file as for ARM boards and drop the host emulation bus which seems redundant. Signed-off-by: Simon Glass <sjg@chromium.org>
269 lines
7.1 KiB
C
269 lines
7.1 KiB
C
/*
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* Chromium OS Matrix Keyboard
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*
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* Copyright (c) 2012 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <cros_ec.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <input.h>
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#include <key_matrix.h>
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#include <stdio_dev.h>
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DECLARE_GLOBAL_DATA_PTR;
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enum {
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KBC_MAX_KEYS = 8, /* Maximum keys held down at once */
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KBC_REPEAT_RATE_MS = 30,
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KBC_REPEAT_DELAY_MS = 240,
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};
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static struct keyb {
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struct cros_ec_dev *dev; /* The CROS_EC device */
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struct input_config input; /* The input layer */
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struct key_matrix matrix; /* The key matrix layer */
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int key_rows; /* Number of keyboard rows */
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int key_cols; /* Number of keyboard columns */
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int ghost_filter; /* 1 to enable ghost filter, else 0 */
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int inited; /* 1 if keyboard is ready */
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} config;
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/**
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* Check the keyboard controller and return a list of key matrix positions
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* for which a key is pressed
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*
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* @param config Keyboard config
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* @param keys List of keys that we have detected
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* @param max_count Maximum number of keys to return
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* @param samep Set to true if this scan repeats the last, else false
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* @return number of pressed keys, 0 for none, -EIO on error
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*/
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static int check_for_keys(struct keyb *config,
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struct key_matrix_key *keys, int max_count,
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bool *samep)
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{
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struct key_matrix_key *key;
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static struct mbkp_keyscan last_scan;
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static bool last_scan_valid;
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struct mbkp_keyscan scan;
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unsigned int row, col, bit, data;
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int num_keys;
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if (cros_ec_scan_keyboard(config->dev, &scan)) {
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debug("%s: keyboard scan failed\n", __func__);
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return -EIO;
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}
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*samep = last_scan_valid && !memcmp(&last_scan, &scan, sizeof(scan));
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/*
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* This is a bit odd. The EC has no way to tell us that it has run
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* out of key scans. It just returns the same scan over and over
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* again. So the only way to detect that we have run out is to detect
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* that this scan is the same as the last.
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*/
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last_scan_valid = true;
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memcpy(&last_scan, &scan, sizeof(last_scan));
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for (col = num_keys = bit = 0; col < config->matrix.num_cols;
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col++) {
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for (row = 0; row < config->matrix.num_rows; row++) {
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unsigned int mask = 1 << (bit & 7);
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data = scan.data[bit / 8];
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if ((data & mask) && num_keys < max_count) {
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key = keys + num_keys++;
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key->row = row;
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key->col = col;
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key->valid = 1;
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}
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bit++;
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}
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}
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return num_keys;
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}
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/**
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* Test if keys are available to be read
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*
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* @return 0 if no keys available, 1 if keys are available
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*/
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static int kbd_tstc(struct stdio_dev *dev)
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{
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/* Just get input to do this for us */
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return config.inited ? input_tstc(&config.input) : 0;
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}
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/**
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* Read a key
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*
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* @return ASCII key code, or 0 if no key, or -1 if error
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*/
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static int kbd_getc(struct stdio_dev *dev)
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{
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/* Just get input to do this for us */
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return config.inited ? input_getc(&config.input) : 0;
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}
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/**
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* Check the keyboard, and send any keys that are pressed.
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*
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* This is called by input_tstc() and input_getc() when they need more
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* characters
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*
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* @param input Input configuration
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* @return 1, to indicate that we have something to look at
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*/
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int cros_ec_kbc_check(struct input_config *input)
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{
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static struct key_matrix_key last_keys[KBC_MAX_KEYS];
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static int last_num_keys;
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struct key_matrix_key keys[KBC_MAX_KEYS];
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int keycodes[KBC_MAX_KEYS];
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int num_keys, num_keycodes;
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int irq_pending, sent;
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bool same = false;
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/*
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* Loop until the EC has no more keyscan records, or we have
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* received at least one character. This means we know that tstc()
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* will always return non-zero if keys have been pressed.
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*
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* Without this loop, a key release (which generates no new ascii
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* characters) will cause us to exit this function, and just tstc()
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* may return 0 before all keys have been read from the EC.
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*/
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do {
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irq_pending = cros_ec_interrupt_pending(config.dev);
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if (irq_pending) {
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num_keys = check_for_keys(&config, keys, KBC_MAX_KEYS,
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&same);
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if (num_keys < 0)
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return 0;
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last_num_keys = num_keys;
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memcpy(last_keys, keys, sizeof(keys));
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} else {
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/*
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* EC doesn't want to be asked, so use keys from last
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* time.
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*/
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num_keys = last_num_keys;
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memcpy(keys, last_keys, sizeof(keys));
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}
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if (num_keys < 0)
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return -1;
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num_keycodes = key_matrix_decode(&config.matrix, keys,
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num_keys, keycodes, KBC_MAX_KEYS);
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sent = input_send_keycodes(input, keycodes, num_keycodes);
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/*
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* For those ECs without an interrupt, stop scanning when we
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* see that the scan is the same as last time.
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*/
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if ((irq_pending < 0) && same)
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break;
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} while (irq_pending && !sent);
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return 1;
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}
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/**
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* Decode MBKP keyboard details from the device tree
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*
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* @param blob Device tree blob
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* @param node Node to decode from
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* @param config Configuration data read from fdt
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* @return 0 if ok, -1 on error
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*/
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static int cros_ec_keyb_decode_fdt(const void *blob, int node,
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struct keyb *config)
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{
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/*
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* Get keyboard rows and columns - at present we are limited to
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* 8 columns by the protocol (one byte per row scan)
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*/
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config->key_rows = fdtdec_get_int(blob, node, "keypad,num-rows", 0);
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config->key_cols = fdtdec_get_int(blob, node, "keypad,num-columns", 0);
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if (!config->key_rows || !config->key_cols ||
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config->key_rows * config->key_cols / 8
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> CROS_EC_KEYSCAN_COLS) {
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debug("%s: Invalid key matrix size %d x %d\n", __func__,
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config->key_rows, config->key_cols);
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return -1;
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}
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config->ghost_filter = fdtdec_get_bool(blob, node,
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"google,needs-ghost-filter");
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return 0;
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}
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/**
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* Set up the keyboard. This is called by the stdio device handler.
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*
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* We want to do this init when the keyboard is actually used rather than
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* at start-up, since keyboard input may not currently be selected.
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*
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* @return 0 if ok, -1 on error
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*/
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static int cros_ec_init_keyboard(struct stdio_dev *dev)
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{
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const void *blob = gd->fdt_blob;
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int node;
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config.dev = board_get_cros_ec_dev();
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if (!config.dev) {
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debug("%s: no cros_ec device: cannot init keyboard\n",
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__func__);
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return -1;
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}
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node = fdtdec_next_compatible(blob, 0, COMPAT_GOOGLE_CROS_EC_KEYB);
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if (node < 0) {
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debug("%s: Node not found\n", __func__);
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return -1;
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}
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if (cros_ec_keyb_decode_fdt(blob, node, &config))
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return -1;
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input_set_delays(&config.input, KBC_REPEAT_DELAY_MS,
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KBC_REPEAT_RATE_MS);
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if (key_matrix_init(&config.matrix, config.key_rows,
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config.key_cols, config.ghost_filter)) {
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debug("%s: cannot init key matrix\n", __func__);
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return -1;
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}
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if (key_matrix_decode_fdt(&config.matrix, gd->fdt_blob, node)) {
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debug("%s: Could not decode key matrix from fdt\n", __func__);
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return -1;
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}
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config.inited = 1;
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debug("%s: Matrix keyboard %dx%d ready\n", __func__, config.key_rows,
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config.key_cols);
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return 0;
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}
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int drv_keyboard_init(void)
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{
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struct stdio_dev dev;
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if (input_init(&config.input, 0)) {
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debug("%s: Cannot set up input\n", __func__);
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return -1;
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}
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config.input.read_keys = cros_ec_kbc_check;
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memset(&dev, '\0', sizeof(dev));
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strcpy(dev.name, "cros-ec-keyb");
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dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
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dev.getc = kbd_getc;
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dev.tstc = kbd_tstc;
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dev.start = cros_ec_init_keyboard;
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/* Register the device. cros_ec_init_keyboard() will be called soon */
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return input_stdio_register(&dev);
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}
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