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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
235 lines
6.5 KiB
C
235 lines
6.5 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 <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 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(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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*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(cros_ec_kbd) = {
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.name = "cros_ec_kbd",
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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_alloc_size = sizeof(struct cros_ec_keyb_priv),
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};
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