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![Sjoerd Simons](/assets/img/avatar_default.png)
The ChromeOS EC keyboard is used by various different chromebooks. Peach pi being the third board in the u-boot tree to use it (snow and peach pit the other two). Rather then embedding the same big DT node in the peach-pi DT again, copy the dtsi snippit & bindings documentation from linux and include it in all 3 boards. This slightly changes the dt bindings in u-boot: * google,key-rows becomes keypad,num-rows * google,key-colums becomes keypad,num-colums * google,repeat-delay-ms and google,repeat-rate-ms are no longer used and replaced by hardcoded values (similar to tegra kbc) Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk> Acked-by: Simon Glass <sjg@chromium.org> Tested-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,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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