/*
 * Driver for the s5k4aa sensor
 *
 * Copyright (C) 2008 Erik Andrén
 * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
 * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
 *
 * Portions of code to USB interface and ALi driver software,
 * Copyright (c) 2006 Willem Duinker
 * v4l2 interface modeled after the V4L2 driver
 * for SN9C10x PC Camera Controllers
 *
 * 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, version 2.
 *
 */

#include "m5602_s5k4aa.h"

int s5k4aa_probe(struct sd *sd)
{
	u8 prod_id[6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
	const u8 expected_prod_id[6] = {0x00, 0x10, 0x00, 0x4b, 0x33, 0x75};
	int i, err = 0;

	if (force_sensor) {
		if (force_sensor == S5K4AA_SENSOR) {
			info("Forcing a %s sensor", s5k4aa.name);
			goto sensor_found;
		}
		/* If we want to force another sensor, don't try to probe this
		 * one */
		return -ENODEV;
	}

	info("Probing for a s5k4aa sensor");

	/* Preinit the sensor */
	for (i = 0; i < ARRAY_SIZE(preinit_s5k4aa) && !err; i++) {
		u8 data[2] = {0x00, 0x00};

		switch (preinit_s5k4aa[i][0]) {
		case BRIDGE:
			err = m5602_write_bridge(sd,
						 preinit_s5k4aa[i][1],
						 preinit_s5k4aa[i][2]);
			break;

		case SENSOR:
			data[0] = preinit_s5k4aa[i][2];
			err = s5k4aa_write_sensor(sd,
						  preinit_s5k4aa[i][1],
						  data, 1);
			break;

		case SENSOR_LONG:
			data[0] = preinit_s5k4aa[i][2];
			data[1] = preinit_s5k4aa[i][3];
			err = s5k4aa_write_sensor(sd,
						  preinit_s5k4aa[i][1],
						  data, 2);
			break;
		default:
			info("Invalid stream command, exiting init");
			return -EINVAL;
		}
	}

	/* Test some registers, but we don't know their exact meaning yet */
	if (s5k4aa_read_sensor(sd, 0x00, prod_id, sizeof(prod_id)))
		return -ENODEV;

	if (memcmp(prod_id, expected_prod_id, sizeof(prod_id)))
		return -ENODEV;
	else
		info("Detected a s5k4aa sensor");
sensor_found:
	sd->gspca_dev.cam.cam_mode = s5k4aa.modes;
	sd->gspca_dev.cam.nmodes = s5k4aa.nmodes;
	sd->desc->ctrls = s5k4aa.ctrls;
	sd->desc->nctrls = s5k4aa.nctrls;

	return 0;
}

int s5k4aa_read_sensor(struct sd *sd, const u8 address,
		       u8 *i2c_data, const u8 len)
{
	int err, i;

	do {
		err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, i2c_data);
	} while ((*i2c_data & I2C_BUSY) && !err);
	if (err < 0)
		goto out;

	err = m5602_write_bridge(sd, M5602_XB_I2C_DEV_ADDR,
				 sd->sensor->i2c_slave_id);
	if (err < 0)
		goto out;

	err = m5602_write_bridge(sd, M5602_XB_I2C_REG_ADDR, address);
	if (err < 0)
		goto out;

	err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x18 + len);
	if (err < 0)
		goto out;

	do {
		err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, i2c_data);
	} while ((*i2c_data & I2C_BUSY) && !err);
	if (err < 0)
		goto out;

	for (i = 0; (i < len) & !err; i++) {
		err = m5602_read_bridge(sd, M5602_XB_I2C_DATA, &(i2c_data[i]));

		PDEBUG(D_CONF, "Reading sensor register "
				  "0x%x containing 0x%x ", address, *i2c_data);
	}
out:
	return (err < 0) ? err : 0;
}

int s5k4aa_write_sensor(struct sd *sd, const u8 address,
			u8 *i2c_data, const u8 len)
{
	int err, i;
	u8 *p;
	struct usb_device *udev = sd->gspca_dev.dev;
	__u8 *buf = sd->gspca_dev.usb_buf;

	/* No sensor with a data width larger than 16 bits has yet been seen */
	if (len > 2 || !len)
		return -EINVAL;

	memcpy(buf, sensor_urb_skeleton,
	       sizeof(sensor_urb_skeleton));

	buf[11] = sd->sensor->i2c_slave_id;
	buf[15] = address;

	/* Special case larger sensor writes */
	p = buf + 16;

	/* Copy a four byte write sequence for each byte to be written to */
	for (i = 0; i < len; i++) {
		memcpy(p, sensor_urb_skeleton + 16, 4);
		p[3] = i2c_data[i];
		p += 4;
		PDEBUG(D_CONF, "Writing sensor register 0x%x with 0x%x",
		       address, i2c_data[i]);
	}

	/* Copy the tailer */
	memcpy(p, sensor_urb_skeleton + 20, 4);

	/* Set the total length */
	p[3] = 0x10 + len;

	err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			      0x04, 0x40, 0x19,
			      0x0000, buf,
			      20 + len * 4, M5602_URB_MSG_TIMEOUT);

	return (err < 0) ? err : 0;
}

int s5k4aa_init(struct sd *sd)
{
	int i, err = 0;

	for (i = 0; i < ARRAY_SIZE(init_s5k4aa) && !err; i++) {
		u8 data[2] = {0x00, 0x00};

		switch (init_s5k4aa[i][0]) {
		case BRIDGE:
			err = m5602_write_bridge(sd,
				init_s5k4aa[i][1],
				init_s5k4aa[i][2]);
			break;

		case SENSOR:
			data[0] = init_s5k4aa[i][2];
			err = s5k4aa_write_sensor(sd,
				init_s5k4aa[i][1], data, 1);
			break;

		case SENSOR_LONG:
			data[0] = init_s5k4aa[i][2];
			data[1] = init_s5k4aa[i][3];
			err = s5k4aa_write_sensor(sd,
				init_s5k4aa[i][1], data, 2);
			break;
		default:
			info("Invalid stream command, exiting init");
			return -EINVAL;
		}
	}

	if (dump_sensor)
		s5k4aa_dump_registers(sd);

	if (!err && dmi_check_system(s5k4aa_vflip_dmi_table)) {
		u8 data = 0x02;
		info("vertical flip quirk active");
		s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
		s5k4aa_read_sensor(sd, S5K4AA_READ_MODE, &data, 1);
		data |= S5K4AA_RM_V_FLIP;
		data &= ~S5K4AA_RM_H_FLIP;
		s5k4aa_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);

		/* Decrement COLSTART to preserve color order (BGGR) */
		s5k4aa_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
		data--;
		s5k4aa_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);

		/* Increment ROWSTART to preserve color order (BGGR) */
		s5k4aa_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
		data++;
		s5k4aa_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	}

	return (err < 0) ? err : 0;
}

int s5k4aa_power_down(struct sd *sd)
{
	return 0;
}

int s5k4aa_get_exposure(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;

	err = s5k4aa_read_sensor(sd, S5K4AA_EXPOSURE_HI, &data, 1);
	if (err < 0)
		goto out;

	*val = data << 8;
	err = s5k4aa_read_sensor(sd, S5K4AA_EXPOSURE_LO, &data, 1);
	*val |= data;
	PDEBUG(D_V4L2, "Read exposure %d", *val);
out:
	return (err < 0) ? err : 0;
}

int s5k4aa_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set exposure to %d", val);
	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;
	data = (val >> 8) & 0xff;
	err = s5k4aa_write_sensor(sd, S5K4AA_EXPOSURE_HI, &data, 1);
	if (err < 0)
		goto out;
	data = val & 0xff;
	err = s5k4aa_write_sensor(sd, S5K4AA_EXPOSURE_LO, &data, 1);
out:
	return (err < 0) ? err : 0;
}

int s5k4aa_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;

	err = s5k4aa_read_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	*val = (data & S5K4AA_RM_V_FLIP) >> 7;
	PDEBUG(D_V4L2, "Read vertical flip %d", *val);

out:
	return (err < 0) ? err : 0;
}

int s5k4aa_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set vertical flip to %d", val);
	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;
	err = s5k4aa_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
		goto out;
	data = ((data & ~S5K4AA_RM_V_FLIP)
			| ((val & 0x01) << 7));
	err = s5k4aa_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
		goto out;

	if (val) {
		err = s5k4aa_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
		if (err < 0)
			goto out;

		data++;
		err = s5k4aa_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	} else {
		err = s5k4aa_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
		if (err < 0)
			goto out;

		data--;
		err = s5k4aa_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	}
out:
	return (err < 0) ? err : 0;
}

int s5k4aa_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;

	err = s5k4aa_read_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	*val = (data & S5K4AA_RM_H_FLIP) >> 6;
	PDEBUG(D_V4L2, "Read horizontal flip %d", *val);
out:
	return (err < 0) ? err : 0;
}

int s5k4aa_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set horizontal flip to %d",
	       val);
	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;
	err = s5k4aa_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
		goto out;

	data = ((data & ~S5K4AA_RM_H_FLIP) | ((val & 0x01) << 6));
	err = s5k4aa_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
		goto out;

	if (val) {
		err = s5k4aa_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
		if (err < 0)
			goto out;
		data++;
		err = s5k4aa_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
		if (err < 0)
			goto out;
	} else {
		err = s5k4aa_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
		if (err < 0)
			goto out;
		data--;
		err = s5k4aa_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
	}
out:
	return (err < 0) ? err : 0;
}

int s5k4aa_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;

	err = s5k4aa_read_sensor(sd, S5K4AA_GAIN_2, &data, 1);
	*val = data;
	PDEBUG(D_V4L2, "Read gain %d", *val);

out:
	return (err < 0) ? err : 0;
}

int s5k4aa_set_gain(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set gain to %d", val);
	err = s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
		goto out;

	data = val & 0xff;
	err = s5k4aa_write_sensor(sd, S5K4AA_GAIN_2, &data, 1);

out:
	return (err < 0) ? err : 0;
}

void s5k4aa_dump_registers(struct sd *sd)
{
	int address;
	u8 page, old_page;
	s5k4aa_read_sensor(sd, S5K4AA_PAGE_MAP, &old_page, 1);
	for (page = 0; page < 16; page++) {
		s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &page, 1);
		info("Dumping the s5k4aa register state for page 0x%x", page);
		for (address = 0; address <= 0xff; address++) {
			u8 value = 0;
			s5k4aa_read_sensor(sd, address, &value, 1);
			info("register 0x%x contains 0x%x",
			     address, value);
		}
	}
	info("s5k4aa register state dump complete");

	for (page = 0; page < 16; page++) {
		s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &page, 1);
		info("Probing for which registers that are "
		     "read/write for page 0x%x", page);
		for (address = 0; address <= 0xff; address++) {
			u8 old_value, ctrl_value, test_value = 0xff;

			s5k4aa_read_sensor(sd, address, &old_value, 1);
			s5k4aa_write_sensor(sd, address, &test_value, 1);
			s5k4aa_read_sensor(sd, address, &ctrl_value, 1);

			if (ctrl_value == test_value)
				info("register 0x%x is writeable", address);
			else
				info("register 0x%x is read only", address);

			/* Restore original value */
			s5k4aa_write_sensor(sd, address, &old_value, 1);
		}
	}
	info("Read/write register probing complete");
	s5k4aa_write_sensor(sd, S5K4AA_PAGE_MAP, &old_page, 1);
}