[people/ms/u-boot.git] / drivers / input / tegra-kbc.c

/*
 *  (C) Copyright 2011
 *  NVIDIA Corporation <www.nvidia.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <input.h>
#include <keyboard.h>
#include <key_matrix.h>
#include <stdio_dev.h>
#include <tegra-kbc.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/funcmux.h>
#include <asm/arch-tegra/timer.h>
#include <linux/input.h>

DECLARE_GLOBAL_DATA_PTR;

enum {
	KBC_MAX_GPIO		= 24,
	KBC_MAX_KPENT		= 8,	/* size of keypress entry queue */
};

#define KBC_FIFO_TH_CNT_SHIFT		14
#define KBC_DEBOUNCE_CNT_SHIFT		4
#define KBC_CONTROL_FIFO_CNT_INT_EN	(1 << 3)
#define KBC_CONTROL_KBC_EN		(1 << 0)
#define KBC_INT_FIFO_CNT_INT_STATUS	(1 << 2)
#define KBC_KPENT_VALID			(1 << 7)
#define KBC_ST_STATUS			(1 << 3)

enum {
	KBC_DEBOUNCE_COUNT	= 2,
	KBC_REPEAT_RATE_MS	= 30,
	KBC_REPEAT_DELAY_MS	= 240,
	KBC_CLOCK_KHZ		= 32,	/* Keyboard uses a 32KHz clock */
};

/* keyboard controller config and state */
struct tegra_kbd_priv {
	struct input_config *input;	/* The input layer */
	struct key_matrix matrix;	/* The key matrix layer */

	struct kbc_tegra *kbc;		/* tegra keyboard controller */
	unsigned char inited;		/* 1 if keyboard has been inited */
	unsigned char first_scan;	/* 1 if this is our first key scan */

	/*
	 * After init we must wait a short time before polling the keyboard.
	 * This gives the tegra keyboard controller time to react after reset
	 * and lets us grab keys pressed during reset.
	 */
	unsigned int init_dly_ms;	/* Delay before we can read keyboard */
	unsigned int start_time_ms;	/* Time that we inited (in ms) */
	unsigned int last_poll_ms;	/* Time we should last polled */
	unsigned int next_repeat_ms;	/* Next time we repeat a key */
};

/**
 * reads the keyboard fifo for current keypresses
 *
 * @param priv		Keyboard private data
 * @param fifo		Place to put fifo results
 * @param max_keycodes	Maximum number of key codes to put in the fifo
 * @return number of items put into fifo
 */
static int tegra_kbc_find_keys(struct tegra_kbd_priv *priv, int *fifo,
			       int max_keycodes)
{
	struct key_matrix_key keys[KBC_MAX_KPENT], *key;
	u32 kp_ent = 0;
	int i;

	for (key = keys, i = 0; i < KBC_MAX_KPENT; i++, key++) {
		/* Get next word */
		if (!(i & 3))
			kp_ent = readl(&priv->kbc->kp_ent[i / 4]);

		key->valid = (kp_ent & KBC_KPENT_VALID) != 0;
		key->row = (kp_ent >> 3) & 0xf;
		key->col = kp_ent & 0x7;

		/* Shift to get next entry */
		kp_ent >>= 8;
	}
	return key_matrix_decode(&priv->matrix, keys, KBC_MAX_KPENT, fifo,
				 max_keycodes);
}

/**
 * Process all the keypress sequences in fifo and send key codes
 *
 * The fifo contains zero or more keypress sets. Each set
 * consists of from 1-8 keycodes, representing the keycodes which
 * were simultaneously pressed during that scan.
 *
 * This function works through each set and generates ASCII characters
 * for each. Not that one set may produce more than one ASCII characters -
 * for example holding down 'd' and 'f' at the same time will generate
 * two ASCII characters.
 *
 * Note: if fifo_cnt is 0, we will tell the input layer that no keys are
 * pressed.
 *
 * @param priv		Keyboard private data
 * @param fifo_cnt	Number of entries in the keyboard fifo
 */
static void process_fifo(struct tegra_kbd_priv *priv, int fifo_cnt)
{
	int fifo[KBC_MAX_KPENT];
	int cnt = 0;

	/* Always call input_send_keycodes() at least once */
	do {
		if (fifo_cnt)
			cnt = tegra_kbc_find_keys(priv, fifo, KBC_MAX_KPENT);

		input_send_keycodes(priv->input, fifo, cnt);
	} while (--fifo_cnt > 0);
}

/**
 * Check the keyboard controller and emit ASCII characters for any keys that
 * are pressed.
 *
 * @param priv		Keyboard private data
 */
static void check_for_keys(struct tegra_kbd_priv *priv)
{
	int fifo_cnt;

	if (!priv->first_scan &&
	    get_timer(priv->last_poll_ms) < KBC_REPEAT_RATE_MS)
		return;
	priv->last_poll_ms = get_timer(0);
	priv->first_scan = 0;

	/*
	 * Once we get here we know the keyboard has been scanned. So if there
	 * scan waiting for us, we know that nothing is held down.
	 */
	fifo_cnt = (readl(&priv->kbc->interrupt) >> 4) & 0xf;
	process_fifo(priv, fifo_cnt);
}

/**
 * In order to detect keys pressed on boot, wait for the hardware to
 * complete scanning the keys. This includes time to transition from
 * Wkup mode to Continous polling mode and the repoll time. We can
 * deduct the time that's already elapsed.
 *
 * @param priv		Keyboard private data
 */
static void kbd_wait_for_fifo_init(struct tegra_kbd_priv *priv)
{
	if (!priv->inited) {
		unsigned long elapsed_time;
		long delay_ms;

		elapsed_time = get_timer(priv->start_time_ms);
		delay_ms = priv->init_dly_ms - elapsed_time;
		if (delay_ms > 0) {
			udelay(delay_ms * 1000);
			debug("%s: delay %ldms\n", __func__, delay_ms);
		}

		priv->inited = 1;
	}
}

/**
 * Check the tegra 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
 */
static int tegra_kbc_check(struct input_config *input)
{
	struct tegra_kbd_priv *priv = dev_get_priv(input->dev);

	kbd_wait_for_fifo_init(priv);
	check_for_keys(priv);

	return 1;
}

/* configures keyboard GPIO registers to use the rows and columns */
static void config_kbc_gpio(struct tegra_kbd_priv *priv, struct kbc_tegra *kbc)
{
	int i;

	for (i = 0; i < KBC_MAX_GPIO; i++) {
		u32 row_cfg, col_cfg;
		u32 r_shift = 5 * (i % 6);
		u32 c_shift = 4 * (i % 8);
		u32 r_mask = 0x1f << r_shift;
		u32 c_mask = 0xf << c_shift;
		u32 r_offs = i / 6;
		u32 c_offs = i / 8;

		row_cfg = readl(&kbc->row_cfg[r_offs]);
		col_cfg = readl(&kbc->col_cfg[c_offs]);

		row_cfg &= ~r_mask;
		col_cfg &= ~c_mask;

		if (i < priv->matrix.num_rows) {
			row_cfg |= ((i << 1) | 1) << r_shift;
		} else {
			col_cfg |= (((i - priv->matrix.num_rows) << 1) | 1)
					<< c_shift;
		}

		writel(row_cfg, &kbc->row_cfg[r_offs]);
		writel(col_cfg, &kbc->col_cfg[c_offs]);
	}
}

/**
 * Start up the keyboard device
 */
static void tegra_kbc_open(struct tegra_kbd_priv *priv)
{
	struct kbc_tegra *kbc = priv->kbc;
	unsigned int scan_period;
	u32 val;

	/*
	 * We will scan at twice the keyboard repeat rate, so that there is
	 * always a scan ready when we check it in check_for_keys().
	 */
	scan_period = KBC_REPEAT_RATE_MS / 2;
	writel(scan_period * KBC_CLOCK_KHZ, &kbc->rpt_dly);
	writel(scan_period * KBC_CLOCK_KHZ, &kbc->init_dly);
	/*
	 * Before reading from the keyboard we must wait for the init_dly
	 * plus the rpt_delay, plus 2ms for the row scan time.
	 */
	priv->init_dly_ms = scan_period * 2 + 2;

	val = KBC_DEBOUNCE_COUNT << KBC_DEBOUNCE_CNT_SHIFT;
	val |= 1 << KBC_FIFO_TH_CNT_SHIFT;	/* fifo interrupt threshold */
	val |= KBC_CONTROL_KBC_EN;		/* enable */
	writel(val, &kbc->control);

	priv->start_time_ms = get_timer(0);
	priv->last_poll_ms = get_timer(0);
	priv->next_repeat_ms = priv->last_poll_ms;
	priv->first_scan = 1;
}

static int tegra_kbd_start(struct udevice *dev)
{
	struct tegra_kbd_priv *priv = dev_get_priv(dev);

	/* Set up pin mux and enable the clock */
	funcmux_select(PERIPH_ID_KBC, FUNCMUX_DEFAULT);
	clock_enable(PERIPH_ID_KBC);
	config_kbc_gpio(priv, priv->kbc);

	tegra_kbc_open(priv);
	debug("%s: Tegra keyboard ready\n", __func__);

	return 0;
}

/**
 * Set up the tegra 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.
 *
 * Once the keyboard starts there will be a period during which we must
 * wait for the keyboard to init. We do this only when a key is first
 * read - see kbd_wait_for_fifo_init().
 *
 * @return 0 if ok, -ve on error
 */
static int tegra_kbd_probe(struct udevice *dev)
{
	struct tegra_kbd_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;

	priv->kbc = (struct kbc_tegra *)devfdt_get_addr(dev);
	if ((fdt_addr_t)priv->kbc == FDT_ADDR_T_NONE) {
		debug("%s: No keyboard register found\n", __func__);
		return -EINVAL;
	}
	input_set_delays(input, KBC_REPEAT_DELAY_MS, KBC_REPEAT_RATE_MS);

	/* Decode the keyboard matrix information (16 rows, 8 columns) */
	ret = key_matrix_init(&priv->matrix, 16, 8, 1);
	if (ret) {
		debug("%s: Could not init key matrix: %d\n", __func__, ret);
		return ret;
	}
	ret = key_matrix_decode_fdt(dev, &priv->matrix);
	if (ret) {
		debug("%s: Could not decode key matrix from fdt: %d\n",
		      __func__, ret);
		return ret;
	}
	input_add_tables(input, false);
	if (priv->matrix.fn_keycode) {
		ret = input_add_table(input, KEY_FN, -1,
				      priv->matrix.fn_keycode,
				      priv->matrix.key_count);
		if (ret) {
			debug("%s: input_add_table() failed\n", __func__);
			return ret;
		}
	}

	/* Register the device. init_tegra_keyboard() will be called soon */
	priv->input = input;
	input->dev = dev;
	input->read_keys = tegra_kbc_check;
	strcpy(sdev->name, "tegra-kbc");
	ret = input_stdio_register(sdev);
	if (ret) {
		debug("%s: input_stdio_register() failed\n", __func__);
		return ret;
	}

	return 0;
}

static const struct keyboard_ops tegra_kbd_ops = {
	.start	= tegra_kbd_start,
};

static const struct udevice_id tegra_kbd_ids[] = {
	{ .compatible = "nvidia,tegra20-kbc" },
	{ }
};

U_BOOT_DRIVER(tegra_kbd) = {
	.name	= "tegra_kbd",
	.id	= UCLASS_KEYBOARD,
	.of_match = tegra_kbd_ids,
	.probe = tegra_kbd_probe,
	.ops	= &tegra_kbd_ops,
	.priv_auto_alloc_size = sizeof(struct tegra_kbd_priv),
};
Commit	Line	Data
6642a681 RI	1	/*
	2	* (C) Copyright 2011
	3	* NVIDIA Corporation <www.nvidia.com>
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
6642a681 RI	6	*/
	7
	8	#include <common.h>
f77f5e9b	9	#include <dm.h>
6642a681 RI	10	#include <fdtdec.h>
6642a681 RI	11	#include <input.h>
f77f5e9b	12	#include <keyboard.h>
6642a681 RI	13	#include <key_matrix.h>
	14	#include <stdio_dev.h>
	15	#include <tegra-kbc.h>
	16	#include <asm/io.h>
	17	#include <asm/arch/clock.h>
	18	#include <asm/arch/funcmux.h>
150c2493	19	#include <asm/arch-tegra/timer.h>
6642a681 RI	20	#include <linux/input.h>
	21
	22	DECLARE_GLOBAL_DATA_PTR;
	23
	24	enum {
	25	KBC_MAX_GPIO = 24,
	26	KBC_MAX_KPENT = 8, /* size of keypress entry queue */
	27	};
	28
	29	#define KBC_FIFO_TH_CNT_SHIFT 14
	30	#define KBC_DEBOUNCE_CNT_SHIFT 4
	31	#define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3)
	32	#define KBC_CONTROL_KBC_EN (1 << 0)
	33	#define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2)
	34	#define KBC_KPENT_VALID (1 << 7)
	35	#define KBC_ST_STATUS (1 << 3)
	36
	37	enum {
	38	KBC_DEBOUNCE_COUNT = 2,
	39	KBC_REPEAT_RATE_MS = 30,
	40	KBC_REPEAT_DELAY_MS = 240,
	41	KBC_CLOCK_KHZ = 32, /* Keyboard uses a 32KHz clock */
	42	};
	43
	44	/* keyboard controller config and state */
f77f5e9b SG	45	struct tegra_kbd_priv {
f77f5e9b SG	46	struct input_config input; / The input layer */
6642a681 RI	47	struct key_matrix matrix; /* The key matrix layer */
	48
	49	struct kbc_tegra kbc; / tegra keyboard controller */
	50	unsigned char inited; /* 1 if keyboard has been inited */
	51	unsigned char first_scan; /* 1 if this is our first key scan */
	52
	53	/*
	54	* After init we must wait a short time before polling the keyboard.
	55	* This gives the tegra keyboard controller time to react after reset
	56	* and lets us grab keys pressed during reset.
	57	*/
	58	unsigned int init_dly_ms; /* Delay before we can read keyboard */
	59	unsigned int start_time_ms; /* Time that we inited (in ms) */
	60	unsigned int last_poll_ms; /* Time we should last polled */
	61	unsigned int next_repeat_ms; /* Next time we repeat a key */
f77f5e9b	62	};
6642a681 RI	63
	64	/**
	65	* reads the keyboard fifo for current keypresses
	66	*
f77f5e9b	67	* @param priv Keyboard private data
6642a681 RI	68	* @param fifo Place to put fifo results
	69	* @param max_keycodes Maximum number of key codes to put in the fifo
	70	* @return number of items put into fifo
	71	*/
f77f5e9b	72	static int tegra_kbc_find_keys(struct tegra_kbd_priv priv, int fifo,
6642a681 RI	73	int max_keycodes)
	74	{
	75	struct key_matrix_key keys[KBC_MAX_KPENT], *key;
	76	u32 kp_ent = 0;
	77	int i;
	78
	79	for (key = keys, i = 0; i < KBC_MAX_KPENT; i++, key++) {
	80	/* Get next word */
	81	if (!(i & 3))
f77f5e9b	82	kp_ent = readl(&priv->kbc->kp_ent[i / 4]);
6642a681 RI	83
	84	key->valid = (kp_ent & KBC_KPENT_VALID) != 0;
	85	key->row = (kp_ent >> 3) & 0xf;
	86	key->col = kp_ent & 0x7;
	87
	88	/* Shift to get next entry */
	89	kp_ent >>= 8;
	90	}
f77f5e9b	91	return key_matrix_decode(&priv->matrix, keys, KBC_MAX_KPENT, fifo,
6642a681 RI	92	max_keycodes);
	93	}
	94
	95	/**
	96	* Process all the keypress sequences in fifo and send key codes
	97	*
	98	* The fifo contains zero or more keypress sets. Each set
	99	* consists of from 1-8 keycodes, representing the keycodes which
	100	* were simultaneously pressed during that scan.
	101	*
	102	* This function works through each set and generates ASCII characters
	103	* for each. Not that one set may produce more than one ASCII characters -
	104	* for example holding down 'd' and 'f' at the same time will generate
	105	* two ASCII characters.
	106	*
	107	* Note: if fifo_cnt is 0, we will tell the input layer that no keys are
	108	* pressed.
	109	*
f77f5e9b	110	* @param priv Keyboard private data
6642a681 RI	111	* @param fifo_cnt Number of entries in the keyboard fifo
6642a681 RI	112	*/
f77f5e9b	113	static void process_fifo(struct tegra_kbd_priv *priv, int fifo_cnt)
6642a681 RI	114	{
	115	int fifo[KBC_MAX_KPENT];
	116	int cnt = 0;
	117
	118	/* Always call input_send_keycodes() at least once */
	119	do {
	120	if (fifo_cnt)
f77f5e9b	121	cnt = tegra_kbc_find_keys(priv, fifo, KBC_MAX_KPENT);
6642a681	122
f77f5e9b	123	input_send_keycodes(priv->input, fifo, cnt);
6642a681 RI	124	} while (--fifo_cnt > 0);
	125	}
	126
	127	/**
	128	* Check the keyboard controller and emit ASCII characters for any keys that
	129	* are pressed.
	130	*
f77f5e9b	131	* @param priv Keyboard private data
6642a681	132	*/
f77f5e9b	133	static void check_for_keys(struct tegra_kbd_priv *priv)
6642a681 RI	134	{
	135	int fifo_cnt;
	136
f77f5e9b SG	137	if (!priv->first_scan &&
f77f5e9b SG	138	get_timer(priv->last_poll_ms) < KBC_REPEAT_RATE_MS)
6642a681	139	return;
f77f5e9b SG	140	priv->last_poll_ms = get_timer(0);
f77f5e9b SG	141	priv->first_scan = 0;
6642a681 RI	142
	143	/*
	144	* Once we get here we know the keyboard has been scanned. So if there
	145	* scan waiting for us, we know that nothing is held down.
	146	*/
f77f5e9b SG	147	fifo_cnt = (readl(&priv->kbc->interrupt) >> 4) & 0xf;
f77f5e9b SG	148	process_fifo(priv, fifo_cnt);
6642a681 RI	149	}
	150
	151	/**
	152	* In order to detect keys pressed on boot, wait for the hardware to
	153	* complete scanning the keys. This includes time to transition from
	154	* Wkup mode to Continous polling mode and the repoll time. We can
	155	* deduct the time that's already elapsed.
	156	*
f77f5e9b	157	* @param priv Keyboard private data
6642a681	158	*/
f77f5e9b	159	static void kbd_wait_for_fifo_init(struct tegra_kbd_priv *priv)
6642a681	160	{
f77f5e9b	161	if (!priv->inited) {
6642a681 RI	162	unsigned long elapsed_time;
	163	long delay_ms;
	164
f77f5e9b SG	165	elapsed_time = get_timer(priv->start_time_ms);
f77f5e9b SG	166	delay_ms = priv->init_dly_ms - elapsed_time;
6642a681 RI	167	if (delay_ms > 0) {
	168	udelay(delay_ms * 1000);
	169	debug("%s: delay %ldms\n", __func__, delay_ms);
	170	}
	171
f77f5e9b	172	priv->inited = 1;
6642a681 RI	173	}
	174	}
	175
	176	/**
	177	* Check the tegra keyboard, and send any keys that are pressed.
	178	*
	179	* This is called by input_tstc() and input_getc() when they need more
	180	* characters
	181	*
	182	* @param input Input configuration
	183	* @return 1, to indicate that we have something to look at
	184	*/
19d7bf3d	185	static int tegra_kbc_check(struct input_config *input)
6642a681	186	{
f77f5e9b	187	struct tegra_kbd_priv *priv = dev_get_priv(input->dev);
6642a681	188
f77f5e9b SG	189	kbd_wait_for_fifo_init(priv);
f77f5e9b SG	190	check_for_keys(priv);
6642a681	191
f77f5e9b	192	return 1;
6642a681 RI	193	}
	194
	195	/* configures keyboard GPIO registers to use the rows and columns */
f77f5e9b	196	static void config_kbc_gpio(struct tegra_kbd_priv priv, struct kbc_tegra kbc)
6642a681 RI	197	{
	198	int i;
	199
	200	for (i = 0; i < KBC_MAX_GPIO; i++) {
	201	u32 row_cfg, col_cfg;
	202	u32 r_shift = 5 * (i % 6);
	203	u32 c_shift = 4 * (i % 8);
	204	u32 r_mask = 0x1f << r_shift;
	205	u32 c_mask = 0xf << c_shift;
	206	u32 r_offs = i / 6;
	207	u32 c_offs = i / 8;
	208
	209	row_cfg = readl(&kbc->row_cfg[r_offs]);
	210	col_cfg = readl(&kbc->col_cfg[c_offs]);
	211
	212	row_cfg &= ~r_mask;
	213	col_cfg &= ~c_mask;
	214
f77f5e9b	215	if (i < priv->matrix.num_rows) {
6642a681 RI	216	row_cfg \|= ((i << 1) \| 1) << r_shift;
6642a681 RI	217	} else {
f77f5e9b	218	col_cfg \|= (((i - priv->matrix.num_rows) << 1) \| 1)
6642a681 RI	219	<< c_shift;
	220	}
	221
	222	writel(row_cfg, &kbc->row_cfg[r_offs]);
	223	writel(col_cfg, &kbc->col_cfg[c_offs]);
	224	}
	225	}
	226
	227	/**
	228	* Start up the keyboard device
	229	*/
f77f5e9b	230	static void tegra_kbc_open(struct tegra_kbd_priv *priv)
6642a681	231	{
f77f5e9b	232	struct kbc_tegra *kbc = priv->kbc;
6642a681 RI	233	unsigned int scan_period;
	234	u32 val;
	235
	236	/*
	237	* We will scan at twice the keyboard repeat rate, so that there is
	238	* always a scan ready when we check it in check_for_keys().
	239	*/
	240	scan_period = KBC_REPEAT_RATE_MS / 2;
	241	writel(scan_period * KBC_CLOCK_KHZ, &kbc->rpt_dly);
	242	writel(scan_period * KBC_CLOCK_KHZ, &kbc->init_dly);
	243	/*
	244	* Before reading from the keyboard we must wait for the init_dly
	245	* plus the rpt_delay, plus 2ms for the row scan time.
	246	*/
f77f5e9b	247	priv->init_dly_ms = scan_period * 2 + 2;
6642a681 RI	248
	249	val = KBC_DEBOUNCE_COUNT << KBC_DEBOUNCE_CNT_SHIFT;
	250	val \|= 1 << KBC_FIFO_TH_CNT_SHIFT; /* fifo interrupt threshold */
	251	val \|= KBC_CONTROL_KBC_EN; /* enable */
	252	writel(val, &kbc->control);
	253
f77f5e9b SG	254	priv->start_time_ms = get_timer(0);
	255	priv->last_poll_ms = get_timer(0);
	256	priv->next_repeat_ms = priv->last_poll_ms;
	257	priv->first_scan = 1;
	258	}
	259
	260	static int tegra_kbd_start(struct udevice *dev)
	261	{
	262	struct tegra_kbd_priv *priv = dev_get_priv(dev);
	263
	264	/* Set up pin mux and enable the clock */
	265	funcmux_select(PERIPH_ID_KBC, FUNCMUX_DEFAULT);
	266	clock_enable(PERIPH_ID_KBC);
	267	config_kbc_gpio(priv, priv->kbc);
	268
	269	tegra_kbc_open(priv);
	270	debug("%s: Tegra keyboard ready\n", __func__);
	271
	272	return 0;
6642a681 RI	273	}
	274
	275	/**
	276	* Set up the tegra keyboard. This is called by the stdio device handler
	277	*
	278	* We want to do this init when the keyboard is actually used rather than
	279	* at start-up, since keyboard input may not currently be selected.
	280	*
	281	* Once the keyboard starts there will be a period during which we must
	282	* wait for the keyboard to init. We do this only when a key is first
	283	* read - see kbd_wait_for_fifo_init().
	284	*
	285	* @return 0 if ok, -ve on error
	286	*/
f77f5e9b	287	static int tegra_kbd_probe(struct udevice *dev)
6642a681	288	{
f77f5e9b SG	289	struct tegra_kbd_priv *priv = dev_get_priv(dev);
	290	struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
	291	struct stdio_dev *sdev = &uc_priv->sdev;
	292	struct input_config *input = &uc_priv->input;
f77f5e9b SG	293	int ret;
f77f5e9b SG	294
a821c4af	295	priv->kbc = (struct kbc_tegra *)devfdt_get_addr(dev);
f77f5e9b	296	if ((fdt_addr_t)priv->kbc == FDT_ADDR_T_NONE) {
6642a681	297	debug("%s: No keyboard register found\n", __func__);
f77f5e9b	298	return -EINVAL;
6642a681	299	}
f77f5e9b	300	input_set_delays(input, KBC_REPEAT_DELAY_MS, KBC_REPEAT_RATE_MS);
6642a681 RI	301
6642a681 RI	302	/* Decode the keyboard matrix information (16 rows, 8 columns) */
f77f5e9b SG	303	ret = key_matrix_init(&priv->matrix, 16, 8, 1);
	304	if (ret) {
	305	debug("%s: Could not init key matrix: %d\n", __func__, ret);
	306	return ret;
6642a681	307	}
8327d41b	308	ret = key_matrix_decode_fdt(dev, &priv->matrix);
f77f5e9b SG	309	if (ret) {
	310	debug("%s: Could not decode key matrix from fdt: %d\n",
	311	__func__, ret);
	312	return ret;
6642a681	313	}
73248479	314	input_add_tables(input, false);
f77f5e9b SG	315	if (priv->matrix.fn_keycode) {
	316	ret = input_add_table(input, KEY_FN, -1,
	317	priv->matrix.fn_keycode,
	318	priv->matrix.key_count);
	319	if (ret) {
	320	debug("%s: input_add_table() failed\n", __func__);
	321	return ret;
	322	}
6642a681	323	}
6642a681	324
f77f5e9b SG	325	/* Register the device. init_tegra_keyboard() will be called soon */
	326	priv->input = input;
	327	input->dev = dev;
	328	input->read_keys = tegra_kbc_check;
f77f5e9b SG	329	strcpy(sdev->name, "tegra-kbc");
	330	ret = input_stdio_register(sdev);
	331	if (ret) {
	332	debug("%s: input_stdio_register() failed\n", __func__);
	333	return ret;
	334	}
6642a681 RI	335
	336	return 0;
	337	}
	338
f77f5e9b SG	339	static const struct keyboard_ops tegra_kbd_ops = {
	340	.start = tegra_kbd_start,
	341	};
6642a681	342
f77f5e9b SG	343	static const struct udevice_id tegra_kbd_ids[] = {
	344	{ .compatible = "nvidia,tegra20-kbc" },
	345	{ }
	346	};
6642a681	347
f77f5e9b SG	348	U_BOOT_DRIVER(tegra_kbd) = {
	349	.name = "tegra_kbd",
	350	.id = UCLASS_KEYBOARD,
	351	.of_match = tegra_kbd_ids,
	352	.probe = tegra_kbd_probe,
	353	.ops = &tegra_kbd_ops,
	354	.priv_auto_alloc_size = sizeof(struct tegra_kbd_priv),
	355	};