Signed-off-by: Randall Spangler <rspang...@chromium.org>
Signed-off-by: Simon Glass <s...@chromium.org>
Signed-off-by: Vincent Palatin <vpala...@chromium.org>
Signed-off-by: Hung-ying Tyan <ty...@chromium.org>
---
README | 5 +
drivers/input/Makefile | 1 +
drivers/input/cros_ec_keyb.c | 263 +++++++++++++++++++++++++++++++++++++++++++
include/fdtdec.h | 1 +
lib/fdtdec.c | 1 +
5 files changed, 271 insertions(+)
create mode 100644 drivers/input/cros_ec_keyb.c
diff --git a/README b/README
index 2352e38..8d340b2 100644
--- a/README
+++ b/README
@@ -1369,6 +1369,11 @@ CBFS (Coreboot Filesystem) support
Export function i8042_kbd_init, i8042_tstc and i8042_getc
for cfb_console. Supports cursor blinking.
+ CONFIG_CROS_EC_KEYB
+ Enables a Chrome OS keyboard using the CROS_EC interface.
+ This uses CROS_EC to communicate with a second microcontroller
+ which provides key scans on request.
+
- Video support:
CONFIG_VIDEO
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 0805e86..4331190 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -27,6 +27,7 @@ LIB := $(obj)libinput.o
COBJS-$(CONFIG_I8042_KBD) += i8042.o
COBJS-$(CONFIG_TEGRA_KEYBOARD) += tegra-kbc.o
+COBJS-$(CONFIG_CROS_EC_KEYB) += cros_ec_keyb.o
ifdef CONFIG_PS2KBD
COBJS-y += keyboard.o pc_keyb.o
COBJS-$(CONFIG_PS2MULT) += ps2mult.o ps2ser.o
diff --git a/drivers/input/cros_ec_keyb.c b/drivers/input/cros_ec_keyb.c
new file mode 100644
index 0000000..260a3de
--- /dev/null
+++ b/drivers/input/cros_ec_keyb.c
@@ -0,0 +1,263 @@
+/*
+ * 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 <fdtdec.h>
+#include <input.h>
+#include <key_matrix.h>
+#include <cros_ec.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;
+ }
+
+ /* TODO(sjg@chromium,org): Should perhaps optimize this algorithm */
+ 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;
+
+ /*
+ * crosbug.com/p/13864
+ *
+ * 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);
+}
diff --git a/include/fdtdec.h b/include/fdtdec.h
index ddf14d0..26ba0a6 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -74,6 +74,7 @@ enum fdt_compat_id {
COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */
COMPAT_SAMSUNG_S3C2440_I2C, /* Exynos I2C Controller */
COMPAT_GOOGLE_CROS_EC, /* Google CROS_EC Protocol */
+ COMPAT_GOOGLE_CROS_EC_KEYB, /* Google CROS_EC Keyboard */
COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */
COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */
COMPAT_SAMSUNG_EXYNOS_SPI, /* Exynos SPI */
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 3377407..52d2768 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -52,6 +52,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
+ COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
--
1.8.1
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