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185f812c41
Sphinx expects Return: and not @return to indicate a return value. find . -name '*.c' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; find . -name '*.h' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
255 lines
7.1 KiB
C
255 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#include <common.h>
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#include <cros_ec.h>
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#include <dm.h>
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#include <errno.h>
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#include <input.h>
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#include <keyboard.h>
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#include <key_matrix.h>
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#include <log.h>
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#include <stdio_dev.h>
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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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struct cros_ec_keyb_priv {
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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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};
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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 dev Keyboard device
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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 udevice *dev, struct key_matrix_key *keys,
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int max_count, bool *samep)
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{
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struct cros_ec_keyb_priv *priv = dev_get_priv(dev);
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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 ec_response_get_next_event event;
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struct mbkp_keyscan *scan = (struct mbkp_keyscan *)
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&event.data.key_matrix;
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unsigned int row, col, bit, data;
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int num_keys;
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int ret;
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/* Get pending MKBP event. It may not be a key matrix event. */
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do {
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ret = cros_ec_get_next_event(dev->parent, &event);
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/* The EC has no events for us at this time. */
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if (ret == -EC_RES_UNAVAILABLE)
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return -EIO;
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else if (ret)
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break;
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} while (event.event_type != EC_MKBP_EVENT_KEY_MATRIX);
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/* Try the old command if the EC doesn't support the above. */
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if (ret == -EC_RES_INVALID_COMMAND) {
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if (cros_ec_scan_keyboard(dev->parent, 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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} else if (ret) {
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debug("%s: Error getting next MKBP event. (%d)\n",
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__func__, ret);
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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 < priv->matrix.num_cols;
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col++) {
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for (row = 0; row < priv->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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* 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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struct udevice *dev = input->dev;
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struct cros_ec_keyb_priv *priv = dev_get_priv(dev);
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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(dev->parent);
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if (irq_pending) {
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num_keys = check_for_keys(dev, 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(&priv->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(struct udevice *dev,
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struct cros_ec_keyb_priv *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 = dev_read_u32_default(dev, "keypad,num-rows", 0);
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config->key_cols = dev_read_u32_default(dev, "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 = dev_read_bool(dev, "google,needs-ghost-filter");
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return 0;
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}
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static int cros_ec_kbd_probe(struct udevice *dev)
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{
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struct cros_ec_keyb_priv *priv = dev_get_priv(dev);
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struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
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struct stdio_dev *sdev = &uc_priv->sdev;
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struct input_config *input = &uc_priv->input;
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int ret;
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ret = cros_ec_keyb_decode_fdt(dev, priv);
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if (ret) {
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debug("%s: Cannot decode node (ret=%d)\n", __func__, ret);
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return -EINVAL;
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}
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input_set_delays(input, KBC_REPEAT_DELAY_MS, KBC_REPEAT_RATE_MS);
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ret = key_matrix_init(&priv->matrix, priv->key_rows, priv->key_cols,
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priv->ghost_filter);
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if (ret) {
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debug("%s: cannot init key matrix\n", __func__);
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return ret;
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}
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ret = key_matrix_decode_fdt(dev, &priv->matrix);
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if (ret) {
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debug("%s: Could not decode key matrix from fdt\n", __func__);
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return ret;
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}
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debug("%s: Matrix keyboard %dx%d ready\n", __func__, priv->key_rows,
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priv->key_cols);
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priv->input = input;
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input->dev = dev;
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input_add_tables(input, false);
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input->read_keys = cros_ec_kbc_check;
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strcpy(sdev->name, "cros-ec-keyb");
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/* Register the device. cros_ec_init_keyboard() will be called soon */
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return input_stdio_register(sdev);
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}
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static const struct keyboard_ops cros_ec_kbd_ops = {
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};
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static const struct udevice_id cros_ec_kbd_ids[] = {
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{ .compatible = "google,cros-ec-keyb" },
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{ }
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};
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U_BOOT_DRIVER(google_cros_ec_keyb) = {
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.name = "google_cros_ec_keyb",
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.id = UCLASS_KEYBOARD,
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.of_match = cros_ec_kbd_ids,
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.probe = cros_ec_kbd_probe,
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.ops = &cros_ec_kbd_ops,
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.priv_auto = sizeof(struct cros_ec_keyb_priv),
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};
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