|
@@ -0,0 +1,261 @@
|
|
|
+/*
|
|
|
+ * Chromium OS Matrix Keyboard
|
|
|
+ *
|
|
|
+ * Copyright (c) 2012 The Chromium OS Authors.
|
|
|
+ * 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 <cros_ec.h>
|
|
|
+#include <fdtdec.h>
|
|
|
+#include <input.h>
|
|
|
+#include <key_matrix.h>
|
|
|
+#include <stdio_dev.h>
|
|
|
+
|
|
|
+DECLARE_GLOBAL_DATA_PTR;
|
|
|
+
|
|
|
+enum {
|
|
|
+ KBC_MAX_KEYS = 8, /* Maximum keys held down at once */
|
|
|
+};
|
|
|
+
|
|
|
+static struct keyb {
|
|
|
+ struct cros_ec_dev *dev; /* The CROS_EC device */
|
|
|
+ struct input_config input; /* The input layer */
|
|
|
+ struct key_matrix matrix; /* The key matrix layer */
|
|
|
+ int key_rows; /* Number of keyboard rows */
|
|
|
+ int key_cols; /* Number of keyboard columns */
|
|
|
+ unsigned int repeat_delay_ms; /* Time before autorepeat starts */
|
|
|
+ unsigned int repeat_rate_ms; /* Autorepeat rate in ms */
|
|
|
+ int ghost_filter; /* 1 to enable ghost filter, else 0 */
|
|
|
+ int inited; /* 1 if keyboard is ready */
|
|
|
+} config;
|
|
|
+
|
|
|
+
|
|
|
+/**
|
|
|
+ * Check the keyboard controller and return a list of key matrix positions
|
|
|
+ * for which a key is pressed
|
|
|
+ *
|
|
|
+ * @param config Keyboard config
|
|
|
+ * @param keys List of keys that we have detected
|
|
|
+ * @param max_count Maximum number of keys to return
|
|
|
+ * @return number of pressed keys, 0 for none
|
|
|
+ */
|
|
|
+static int check_for_keys(struct keyb *config,
|
|
|
+ struct key_matrix_key *keys, int max_count)
|
|
|
+{
|
|
|
+ struct key_matrix_key *key;
|
|
|
+ struct mbkp_keyscan scan;
|
|
|
+ unsigned int row, col, bit, data;
|
|
|
+ int num_keys;
|
|
|
+
|
|
|
+ if (cros_ec_scan_keyboard(config->dev, &scan)) {
|
|
|
+ debug("%s: keyboard scan failed\n", __func__);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (col = num_keys = bit = 0; col < config->matrix.num_cols;
|
|
|
+ col++) {
|
|
|
+ for (row = 0; row < config->matrix.num_rows; row++) {
|
|
|
+ unsigned int mask = 1 << (bit & 7);
|
|
|
+
|
|
|
+ data = scan.data[bit / 8];
|
|
|
+ if ((data & mask) && num_keys < max_count) {
|
|
|
+ key = keys + num_keys++;
|
|
|
+ key->row = row;
|
|
|
+ key->col = col;
|
|
|
+ key->valid = 1;
|
|
|
+ }
|
|
|
+ bit++;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return num_keys;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * 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 config.inited ? input_tstc(&config.input) : 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Read a 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 config.inited ? input_getc(&config.input) : 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Check the 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 cros_ec_kbc_check(struct input_config *input)
|
|
|
+{
|
|
|
+ static struct key_matrix_key last_keys[KBC_MAX_KEYS];
|
|
|
+ static int last_num_keys;
|
|
|
+ struct key_matrix_key keys[KBC_MAX_KEYS];
|
|
|
+ int keycodes[KBC_MAX_KEYS];
|
|
|
+ int num_keys, num_keycodes;
|
|
|
+ int irq_pending, sent;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Loop until the EC has no more keyscan records, or we have
|
|
|
+ * received at least one character. This means we know that tstc()
|
|
|
+ * will always return non-zero if keys have been pressed.
|
|
|
+ *
|
|
|
+ * Without this loop, a key release (which generates no new ascii
|
|
|
+ * characters) will cause us to exit this function, and just tstc()
|
|
|
+ * may return 0 before all keys have been read from the EC.
|
|
|
+ */
|
|
|
+ do {
|
|
|
+ irq_pending = cros_ec_interrupt_pending(config.dev);
|
|
|
+ if (irq_pending) {
|
|
|
+ num_keys = check_for_keys(&config, keys, KBC_MAX_KEYS);
|
|
|
+ last_num_keys = num_keys;
|
|
|
+ memcpy(last_keys, keys, sizeof(keys));
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * EC doesn't want to be asked, so use keys from last
|
|
|
+ * time.
|
|
|
+ */
|
|
|
+ num_keys = last_num_keys;
|
|
|
+ memcpy(keys, last_keys, sizeof(keys));
|
|
|
+ }
|
|
|
+
|
|
|
+ if (num_keys < 0)
|
|
|
+ return -1;
|
|
|
+ num_keycodes = key_matrix_decode(&config.matrix, keys,
|
|
|
+ num_keys, keycodes, KBC_MAX_KEYS);
|
|
|
+ sent = input_send_keycodes(input, keycodes, num_keycodes);
|
|
|
+ } while (irq_pending && !sent);
|
|
|
+
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Decode MBKP keyboard details from the device tree
|
|
|
+ *
|
|
|
+ * @param blob Device tree blob
|
|
|
+ * @param node Node to decode from
|
|
|
+ * @param config Configuration data read from fdt
|
|
|
+ * @return 0 if ok, -1 on error
|
|
|
+ */
|
|
|
+static int cros_ec_keyb_decode_fdt(const void *blob, int node,
|
|
|
+ struct keyb *config)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * Get keyboard rows and columns - at present we are limited to
|
|
|
+ * 8 columns by the protocol (one byte per row scan)
|
|
|
+ */
|
|
|
+ config->key_rows = fdtdec_get_int(blob, node, "google,key-rows", 0);
|
|
|
+ config->key_cols = fdtdec_get_int(blob, node, "google,key-columns", 0);
|
|
|
+ if (!config->key_rows || !config->key_cols ||
|
|
|
+ config->key_rows * config->key_cols / 8
|
|
|
+ > CROS_EC_KEYSCAN_COLS) {
|
|
|
+ debug("%s: Invalid key matrix size %d x %d\n", __func__,
|
|
|
+ config->key_rows, config->key_cols);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ config->repeat_delay_ms = fdtdec_get_int(blob, node,
|
|
|
+ "google,repeat-delay-ms", 0);
|
|
|
+ config->repeat_rate_ms = fdtdec_get_int(blob, node,
|
|
|
+ "google,repeat-rate-ms", 0);
|
|
|
+ config->ghost_filter = fdtdec_get_bool(blob, node,
|
|
|
+ "google,ghost-filter");
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Set up the 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.
|
|
|
+ *
|
|
|
+ * @return 0 if ok, -1 on error
|
|
|
+ */
|
|
|
+static int cros_ec_init_keyboard(void)
|
|
|
+{
|
|
|
+ const void *blob = gd->fdt_blob;
|
|
|
+ int node;
|
|
|
+
|
|
|
+ config.dev = board_get_cros_ec_dev();
|
|
|
+ if (!config.dev) {
|
|
|
+ debug("%s: no cros_ec device: cannot init keyboard\n",
|
|
|
+ __func__);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ node = fdtdec_next_compatible(blob, 0, COMPAT_GOOGLE_CROS_EC_KEYB);
|
|
|
+ if (node < 0) {
|
|
|
+ debug("%s: Node not found\n", __func__);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ if (cros_ec_keyb_decode_fdt(blob, node, &config))
|
|
|
+ return -1;
|
|
|
+ input_set_delays(&config.input, config.repeat_delay_ms,
|
|
|
+ config.repeat_rate_ms);
|
|
|
+ if (key_matrix_init(&config.matrix, config.key_rows,
|
|
|
+ config.key_cols, config.ghost_filter)) {
|
|
|
+ debug("%s: cannot 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;
|
|
|
+ }
|
|
|
+ config.inited = 1;
|
|
|
+ debug("%s: Matrix keyboard %dx%d ready\n", __func__, config.key_rows,
|
|
|
+ config.key_cols);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int drv_keyboard_init(void)
|
|
|
+{
|
|
|
+ struct stdio_dev dev;
|
|
|
+
|
|
|
+ if (input_init(&config.input, 0)) {
|
|
|
+ debug("%s: Cannot set up input\n", __func__);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ config.input.read_keys = cros_ec_kbc_check;
|
|
|
+
|
|
|
+ memset(&dev, '\0', sizeof(dev));
|
|
|
+ strcpy(dev.name, "cros-ec-keyb");
|
|
|
+ dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
|
|
|
+ dev.getc = kbd_getc;
|
|
|
+ dev.tstc = kbd_tstc;
|
|
|
+ dev.start = cros_ec_init_keyboard;
|
|
|
+
|
|
|
+ /* Register the device. cros_ec_init_keyboard() will be called soon */
|
|
|
+ return input_stdio_register(&dev);
|
|
|
+}
|