Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 255 insertions, 0 deletions

diff --git a/roms/u-boot/drivers/input/cros_ec_keyb.c b/roms/u-boot/drivers/input/cros_ec_keyb.c
new file mode 100644
index 000000000..dc3b08c0f
--- /dev/null
+++ b/roms/u-boot/drivers/input/cros_ec_keyb.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Chromium OS Matrix Keyboard
+ *
+ * Copyright (c) 2012 The Chromium OS Authors.
+ */
+
+#include <common.h>
+#include <cros_ec.h>
+#include <dm.h>
+#include <errno.h>
+#include <input.h>
+#include <keyboard.h>
+#include <key_matrix.h>
+#include <log.h>
+#include <stdio_dev.h>
+
+enum {
+	KBC_MAX_KEYS		= 8,	/* Maximum keys held down at once */
+	KBC_REPEAT_RATE_MS	= 30,
+	KBC_REPEAT_DELAY_MS	= 240,
+};
+
+struct cros_ec_keyb_priv {
+	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 */
+	int ghost_filter;		/* 1 to enable ghost filter, else 0 */
+};
+
+
+/**
+ * Check the keyboard controller and return a list of key matrix positions
+ * for which a key is pressed
+ *
+ * @param dev		Keyboard device
+ * @param keys		List of keys that we have detected
+ * @param max_count	Maximum number of keys to return
+ * @param samep		Set to true if this scan repeats the last, else false
+ * @return number of pressed keys, 0 for none, -EIO on error
+ */
+static int check_for_keys(struct udevice *dev, struct key_matrix_key *keys,
+			  int max_count, bool *samep)
+{
+	struct cros_ec_keyb_priv *priv = dev_get_priv(dev);
+	struct key_matrix_key *key;
+	static struct mbkp_keyscan last_scan;
+	static bool last_scan_valid;
+	struct ec_response_get_next_event event;
+	struct mbkp_keyscan *scan = (struct mbkp_keyscan *)
+				    &event.data.key_matrix;
+	unsigned int row, col, bit, data;
+	int num_keys;
+	int ret;
+
+	/* Get pending MKBP event. It may not be a key matrix event. */
+	do {
+		ret = cros_ec_get_next_event(dev->parent, &event);
+		/* The EC has no events for us at this time. */
+		if (ret == -EC_RES_UNAVAILABLE)
+			return -EIO;
+		else if (ret)
+			break;
+	} while (event.event_type != EC_MKBP_EVENT_KEY_MATRIX);
+
+	/* Try the old command if the EC doesn't support the above. */
+	if (ret == -EC_RES_INVALID_COMMAND) {
+		if (cros_ec_scan_keyboard(dev->parent, scan)) {
+			debug("%s: keyboard scan failed\n", __func__);
+			return -EIO;
+		}
+	} else if (ret) {
+		debug("%s: Error getting next MKBP event. (%d)\n",
+		      __func__, ret);
+		return -EIO;
+	}
+	*samep = last_scan_valid && !memcmp(&last_scan, scan, sizeof(*scan));
+
+	/*
+	 * This is a bit odd. The EC has no way to tell us that it has run
+	 * out of key scans. It just returns the same scan over and over
+	 * again. So the only way to detect that we have run out is to detect
+	 * that this scan is the same as the last.
+	 */
+	last_scan_valid = true;
+	memcpy(&last_scan, scan, sizeof(last_scan));
+
+	for (col = num_keys = bit = 0; col < priv->matrix.num_cols;
+			col++) {
+		for (row = 0; row < priv->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;
+}
+
+/**
+ * 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)
+{
+	struct udevice *dev = input->dev;
+	struct cros_ec_keyb_priv *priv = dev_get_priv(dev);
+	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;
+	bool same = false;
+
+	/*
+	 * 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(dev->parent);
+		if (irq_pending) {
+			num_keys = check_for_keys(dev, keys, KBC_MAX_KEYS,
+						  &same);
+			if (num_keys < 0)
+				return 0;
+			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(&priv->matrix, keys,
+				num_keys, keycodes, KBC_MAX_KEYS);
+		sent = input_send_keycodes(input, keycodes, num_keycodes);
+
+		/*
+		 * For those ECs without an interrupt, stop scanning when we
+		 * see that the scan is the same as last time.
+		 */
+		if ((irq_pending < 0) && same)
+			break;
+	} 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(struct udevice *dev,
+				   struct cros_ec_keyb_priv *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 = dev_read_u32_default(dev, "keypad,num-rows", 0);
+	config->key_cols = dev_read_u32_default(dev, "keypad,num-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->ghost_filter = dev_read_bool(dev, "google,needs-ghost-filter");
+
+	return 0;
+}
+
+static int cros_ec_kbd_probe(struct udevice *dev)
+{
+	struct cros_ec_keyb_priv *priv = dev_get_priv(dev);
+	struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct stdio_dev *sdev = &uc_priv->sdev;
+	struct input_config *input = &uc_priv->input;
+	int ret;
+
+	ret = cros_ec_keyb_decode_fdt(dev, priv);
+	if (ret) {
+		debug("%s: Cannot decode node (ret=%d)\n", __func__, ret);
+		return -EINVAL;
+	}
+	input_set_delays(input, KBC_REPEAT_DELAY_MS, KBC_REPEAT_RATE_MS);
+	ret = key_matrix_init(&priv->matrix, priv->key_rows, priv->key_cols,
+			      priv->ghost_filter);
+	if (ret) {
+		debug("%s: cannot init key matrix\n", __func__);
+		return ret;
+	}
+	ret = key_matrix_decode_fdt(dev, &priv->matrix);
+	if (ret) {
+		debug("%s: Could not decode key matrix from fdt\n", __func__);
+		return ret;
+	}
+	debug("%s: Matrix keyboard %dx%d ready\n", __func__, priv->key_rows,
+	      priv->key_cols);
+
+	priv->input = input;
+	input->dev = dev;
+	input_add_tables(input, false);
+	input->read_keys = cros_ec_kbc_check;
+	strcpy(sdev->name, "cros-ec-keyb");
+
+	/* Register the device. cros_ec_init_keyboard() will be called soon */
+	return input_stdio_register(sdev);
+}
+
+static const struct keyboard_ops cros_ec_kbd_ops = {
+};
+
+static const struct udevice_id cros_ec_kbd_ids[] = {
+	{ .compatible = "google,cros-ec-keyb" },
+	{ }
+};
+
+U_BOOT_DRIVER(google_cros_ec_keyb) = {
+	.name	= "google_cros_ec_keyb",
+	.id	= UCLASS_KEYBOARD,
+	.of_match = cros_ec_kbd_ids,
+	.probe = cros_ec_kbd_probe,
+	.ops	= &cros_ec_kbd_ops,
+	.priv_auto	= sizeof(struct cros_ec_keyb_priv),
+};