/*
 * saa7185 - Philips SAA7185B video encoder driver version 0.0.3
 *
 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
 *
 * Slight changes for video timing and attachment output by
 * Wolfgang Scherr <scherr@net4you.net>
 *
 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
 *    - moved over to linux>=2.4.x i2c protocol (1/1/2003)
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/signal.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/uaccess.h>

#include <linux/videodev.h>
#include <linux/video_encoder.h>

MODULE_DESCRIPTION("Philips SAA7185 video encoder driver");
MODULE_AUTHOR("Dave Perks");
MODULE_LICENSE("GPL");


#define I2C_NAME(s) (s)->name


static int debug;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-1)");

#define dprintk(num, format, args...) \
	do { \
		if (debug >= num) \
			printk(format, ##args); \
	} while (0)

/* ----------------------------------------------------------------------- */

struct saa7185 {
	unsigned char reg[128];

	int norm;
	int enable;
	int bright;
	int contrast;
	int hue;
	int sat;
};

#define   I2C_SAA7185        0x88

/* ----------------------------------------------------------------------- */

static inline int
saa7185_read (struct i2c_client *client)
{
	return i2c_smbus_read_byte(client);
}

static int
saa7185_write (struct i2c_client *client,
	       u8                 reg,
	       u8                 value)
{
	struct saa7185 *encoder = i2c_get_clientdata(client);

	dprintk(1, KERN_DEBUG "SAA7185: %02x set to %02x\n", reg, value);
	encoder->reg[reg] = value;
	return i2c_smbus_write_byte_data(client, reg, value);
}

static int
saa7185_write_block (struct i2c_client *client,
		     const u8          *data,
		     unsigned int       len)
{
	int ret = -1;
	u8 reg;

	/* the adv7175 has an autoincrement function, use it if
	 * the adapter understands raw I2C */
	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		/* do raw I2C, not smbus compatible */
		struct saa7185 *encoder = i2c_get_clientdata(client);
		u8 block_data[32];
		int block_len;

		while (len >= 2) {
			block_len = 0;
			block_data[block_len++] = reg = data[0];
			do {
				block_data[block_len++] =
				    encoder->reg[reg++] = data[1];
				len -= 2;
				data += 2;
			} while (len >= 2 && data[0] == reg &&
				 block_len < 32);
			if ((ret = i2c_master_send(client, block_data,
						   block_len)) < 0)
				break;
		}
	} else {
		/* do some slow I2C emulation kind of thing */
		while (len >= 2) {
			reg = *data++;
			if ((ret = saa7185_write(client, reg,
						 *data++)) < 0)
				break;
			len -= 2;
		}
	}

	return ret;
}

/* ----------------------------------------------------------------------- */

static const unsigned char init_common[] = {
	0x3a, 0x0f,		/* CBENB=0, V656=0, VY2C=1,
				 * YUV2C=1, MY2C=1, MUV2C=1 */

	0x42, 0x6b,		/* OVLY0=107 */
	0x43, 0x00,		/* OVLU0=0     white */
	0x44, 0x00,		/* OVLV0=0   */
	0x45, 0x22,		/* OVLY1=34  */
	0x46, 0xac,		/* OVLU1=172   yellow */
	0x47, 0x0e,		/* OVLV1=14  */
	0x48, 0x03,		/* OVLY2=3   */
	0x49, 0x1d,		/* OVLU2=29    cyan */
	0x4a, 0xac,		/* OVLV2=172 */
	0x4b, 0xf0,		/* OVLY3=240 */
	0x4c, 0xc8,		/* OVLU3=200   green */
	0x4d, 0xb9,		/* OVLV3=185 */
	0x4e, 0xd4,		/* OVLY4=212 */
	0x4f, 0x38,		/* OVLU4=56    magenta */
	0x50, 0x47,		/* OVLV4=71  */
	0x51, 0xc1,		/* OVLY5=193 */
	0x52, 0xe3,		/* OVLU5=227   red */
	0x53, 0x54,		/* OVLV5=84  */
	0x54, 0xa3,		/* OVLY6=163 */
	0x55, 0x54,		/* OVLU6=84    blue */
	0x56, 0xf2,		/* OVLV6=242 */
	0x57, 0x90,		/* OVLY7=144 */
	0x58, 0x00,		/* OVLU7=0     black */
	0x59, 0x00,		/* OVLV7=0   */

	0x5a, 0x00,		/* CHPS=0    */
	0x5b, 0x76,		/* GAINU=118 */
	0x5c, 0xa5,		/* GAINV=165 */
	0x5d, 0x3c,		/* BLCKL=60  */
	0x5e, 0x3a,		/* BLNNL=58  */
	0x5f, 0x3a,		/* CCRS=0, BLNVB=58 */
	0x60, 0x00,		/* NULL      */

	/* 0x61 - 0x66 set according to norm */

	0x67, 0x00,		/* 0 : caption 1st byte odd  field */
	0x68, 0x00,		/* 0 : caption 2nd byte odd  field */
	0x69, 0x00,		/* 0 : caption 1st byte even field */
	0x6a, 0x00,		/* 0 : caption 2nd byte even field */

	0x6b, 0x91,		/* MODIN=2, PCREF=0, SCCLN=17 */
	0x6c, 0x20,		/* SRCV1=0, TRCV2=1, ORCV1=0, PRCV1=0,
				 * CBLF=0, ORCV2=0, PRCV2=0 */
	0x6d, 0x00,		/* SRCM1=0, CCEN=0 */

	0x6e, 0x0e,		/* HTRIG=0x005, approx. centered, at
				 * least for PAL */
	0x6f, 0x00,		/* HTRIG upper bits */
	0x70, 0x20,		/* PHRES=0, SBLN=1, VTRIG=0 */

	/* The following should not be needed */

	0x71, 0x15,		/* BMRQ=0x115 */
	0x72, 0x90,		/* EMRQ=0x690 */
	0x73, 0x61,		/* EMRQ=0x690, BMRQ=0x115 */
	0x74, 0x00,		/* NULL       */
	0x75, 0x00,		/* NULL       */
	0x76, 0x00,		/* NULL       */
	0x77, 0x15,		/* BRCV=0x115 */
	0x78, 0x90,		/* ERCV=0x690 */
	0x79, 0x61,		/* ERCV=0x690, BRCV=0x115 */

	/* Field length controls */

	0x7a, 0x70,		/* FLC=0 */

	/* The following should not be needed if SBLN = 1 */

	0x7b, 0x16,		/* FAL=22 */
	0x7c, 0x35,		/* LAL=244 */
	0x7d, 0x20,		/* LAL=244, FAL=22 */
};

static const unsigned char init_pal[] = {
	0x61, 0x1e,		/* FISE=0, PAL=1, SCBW=1, RTCE=1,
				 * YGS=1, INPI=0, DOWN=0 */
	0x62, 0xc8,		/* DECTYP=1, BSTA=72 */
	0x63, 0xcb,		/* FSC0 */
	0x64, 0x8a,		/* FSC1 */
	0x65, 0x09,		/* FSC2 */
	0x66, 0x2a,		/* FSC3 */
};

static const unsigned char init_ntsc[] = {
	0x61, 0x1d,		/* FISE=1, PAL=0, SCBW=1, RTCE=1,
				 * YGS=1, INPI=0, DOWN=0 */
	0x62, 0xe6,		/* DECTYP=1, BSTA=102 */
	0x63, 0x1f,		/* FSC0 */
	0x64, 0x7c,		/* FSC1 */
	0x65, 0xf0,		/* FSC2 */
	0x66, 0x21,		/* FSC3 */
};

static int
saa7185_command (struct i2c_client *client,
		 unsigned int       cmd,
		 void              *arg)
{
	struct saa7185 *encoder = i2c_get_clientdata(client);

	switch (cmd) {

	case 0:
		saa7185_write_block(client, init_common,
				    sizeof(init_common));
		switch (encoder->norm) {

		case VIDEO_MODE_NTSC:
			saa7185_write_block(client, init_ntsc,
					    sizeof(init_ntsc));
			break;

		case VIDEO_MODE_PAL:
			saa7185_write_block(client, init_pal,
					    sizeof(init_pal));
			break;
		}

		break;

	case ENCODER_GET_CAPABILITIES:
	{
		struct video_encoder_capability *cap = arg;

		cap->flags =
		    VIDEO_ENCODER_PAL | VIDEO_ENCODER_NTSC |
		    VIDEO_ENCODER_SECAM | VIDEO_ENCODER_CCIR;
		cap->inputs = 1;
		cap->outputs = 1;
	}
		break;

	case ENCODER_SET_NORM:
	{
		int *iarg = arg;

		//saa7185_write_block(client, init_common, sizeof(init_common));

		switch (*iarg) {

		case VIDEO_MODE_NTSC:
			saa7185_write_block(client, init_ntsc,
					    sizeof(init_ntsc));
			break;

		case VIDEO_MODE_PAL:
			saa7185_write_block(client, init_pal,
					    sizeof(init_pal));
			break;

		case VIDEO_MODE_SECAM:
		default:
			return -EINVAL;

		}
		encoder->norm = *iarg;
	}
		break;

	case ENCODER_SET_INPUT:
	{
		int *iarg = arg;

		/* RJ: *iarg = 0: input is from SA7111
		 *iarg = 1: input is from ZR36060 */

		switch (*iarg) {

		case 0:
			/* Switch RTCE to 1 */
			saa7185_write(client, 0x61,
				      (encoder->reg[0x61] & 0xf7) | 0x08);
			saa7185_write(client, 0x6e, 0x01);
			break;

		case 1:
			/* Switch RTCE to 0 */
			saa7185_write(client, 0x61,
				      (encoder->reg[0x61] & 0xf7) | 0x00);
			/* SW: a slight sync problem... */
			saa7185_write(client, 0x6e, 0x00);
			break;

		default:
			return -EINVAL;

		}
	}
		break;

	case ENCODER_SET_OUTPUT:
	{
		int *iarg = arg;

		/* not much choice of outputs */
		if (*iarg != 0) {
			return -EINVAL;
		}
	}
		break;

	case ENCODER_ENABLE_OUTPUT:
	{
		int *iarg = arg;

		encoder->enable = !!*iarg;
		saa7185_write(client, 0x61,
			      (encoder->reg[0x61] & 0xbf) |
			      (encoder->enable ? 0x00 : 0x40));
	}
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

/* ----------------------------------------------------------------------- */

/*
 * Generic i2c probe
 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 */
static unsigned short normal_i2c[] = { I2C_SAA7185 >> 1, I2C_CLIENT_END };

static unsigned short ignore = I2C_CLIENT_END;

static struct i2c_client_address_data addr_data = {
	.normal_i2c		= normal_i2c,
	.probe			= &ignore,
	.ignore			= &ignore,
};

static struct i2c_driver i2c_driver_saa7185;

static int
saa7185_detect_client (struct i2c_adapter *adapter,
		       int                 address,
		       int                 kind)
{
	int i;
	struct i2c_client *client;
	struct saa7185 *encoder;

	dprintk(1,
		KERN_INFO
		"saa7185.c: detecting saa7185 client on address 0x%x\n",
		address << 1);

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return 0;

	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (!client)
		return -ENOMEM;
	client->addr = address;
	client->adapter = adapter;
	client->driver = &i2c_driver_saa7185;
	strlcpy(I2C_NAME(client), "saa7185", sizeof(I2C_NAME(client)));

	encoder = kzalloc(sizeof(struct saa7185), GFP_KERNEL);
	if (encoder == NULL) {
		kfree(client);
		return -ENOMEM;
	}
	encoder->norm = VIDEO_MODE_NTSC;
	encoder->enable = 1;
	i2c_set_clientdata(client, encoder);

	i = i2c_attach_client(client);
	if (i) {
		kfree(client);
		kfree(encoder);
		return i;
	}

	i = saa7185_write_block(client, init_common, sizeof(init_common));
	if (i >= 0) {
		i = saa7185_write_block(client, init_ntsc,
					sizeof(init_ntsc));
	}
	if (i < 0) {
		dprintk(1, KERN_ERR "%s_attach: init error %d\n",
			I2C_NAME(client), i);
	} else {
		dprintk(1,
			KERN_INFO
			"%s_attach: chip version %d at address 0x%x\n",
			I2C_NAME(client), saa7185_read(client) >> 5,
			client->addr << 1);
	}

	return 0;
}

static int
saa7185_attach_adapter (struct i2c_adapter *adapter)
{
	dprintk(1,
		KERN_INFO
		"saa7185.c: starting probe for adapter %s (0x%x)\n",
		I2C_NAME(adapter), adapter->id);
	return i2c_probe(adapter, &addr_data, &saa7185_detect_client);
}

static int
saa7185_detach_client (struct i2c_client *client)
{
	struct saa7185 *encoder = i2c_get_clientdata(client);
	int err;

	err = i2c_detach_client(client);
	if (err) {
		return err;
	}

	saa7185_write(client, 0x61, (encoder->reg[0x61]) | 0x40);	/* SW: output off is active */
	//saa7185_write(client, 0x3a, (encoder->reg[0x3a]) | 0x80); /* SW: color bar */

	kfree(encoder);
	kfree(client);

	return 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver i2c_driver_saa7185 = {
	.driver = {
		.name = "saa7185",	/* name */
	},

	.id = I2C_DRIVERID_SAA7185B,

	.attach_adapter = saa7185_attach_adapter,
	.detach_client = saa7185_detach_client,
	.command = saa7185_command,
};

static int __init
saa7185_init (void)
{
	return i2c_add_driver(&i2c_driver_saa7185);
}

static void __exit
saa7185_exit (void)
{
	i2c_del_driver(&i2c_driver_saa7185);
}

module_init(saa7185_init);
module_exit(saa7185_exit);