/*
   * upd6408x - NEC Electronics 3-Dimensional Y/C separation driver
   *
   * 2003 by T.Adachi (tadachi@tadachi-net.com)
   * 2003 by Takeru KOMORIYA <komoriya@paken.org>
   * 2006 by Hans Verkuil <hverkuil@xs4all.nl>
   *
   * 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., 51 Franklin Street, Fifth Floor, Boston, MA
   * 02110-1301, USA.

   */

  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/i2c.h>
  #include <linux/videodev2.h>

  #include <media/v4l2-device.h>

  #include <media/v4l2-chip-ident.h>

  #include <media/v4l2-i2c-drv.h>

  #include <media/upd64083.h>
  
  MODULE_DESCRIPTION("uPD64083 driver");
  MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  MODULE_LICENSE("GPL");

  static int debug;

  module_param(debug, bool, 0644);
  
  MODULE_PARM_DESC(debug, "Debug level (0-1)");

  
  enum {
  	R00 = 0, R01, R02, R03, R04,
  	R05, R06, R07, R08, R09,
  	R0A, R0B, R0C, R0D, R0E, R0F,
  	R10, R11, R12, R13, R14,
  	R15, R16,
  	TOT_REGS
  };
  
  struct upd64083_state {

  	struct v4l2_subdev sd;

  	u8 mode;
  	u8 ext_y_adc;
  	u8 regs[TOT_REGS];
  };

  static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
  {
  	return container_of(sd, struct upd64083_state, sd);
  }

  /* Initial values when used in combination with the
     NEC upd64031a ghost reduction chip. */
  static u8 upd64083_init[] = {
  	0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
  	0x36, 0xdd, 0x05, 0x56, 0x48,
  	0x00, 0x3a, 0xa0, 0x05, 0x08,
  	0x44, 0x60, 0x08, 0x52, 0xf8,
  	0x53, 0x60, 0x10
  };
  
  /* ------------------------------------------------------------------------ */

  static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)

  {

  	struct i2c_client *client = v4l2_get_subdevdata(sd);

  	u8 buf[2];
  
  	buf[0] = reg;
  	buf[1] = val;

  	v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x
  ", reg, val);

  	if (i2c_master_send(client, buf, 2) != 2)

  		v4l2_err(sd, "I/O error write 0x%02x/0x%02x
  ", reg, val);

  }
  
  /* ------------------------------------------------------------------------ */
  
  #ifdef CONFIG_VIDEO_ADV_DEBUG

  static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)

  {

  	struct i2c_client *client = v4l2_get_subdevdata(sd);

  	u8 buf[7];
  
  	if (reg >= sizeof(buf))
  		return 0xff;
  	i2c_master_recv(client, buf, sizeof(buf));
  	return buf[reg];
  }
  #endif
  
  /* ------------------------------------------------------------------------ */

  static int upd64083_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)

  {

  	struct upd64083_state *state = to_state(sd);
  	u8 r00, r02;
  
  	if (route->input > 7 || (route->input & 6) == 6)
  		return -EINVAL;
  	state->mode = (route->input & 3) << 6;
  	state->ext_y_adc = (route->input & UPD64083_EXT_Y_ADC) << 3;
  	r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
  	r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
  	upd64083_write(sd, R00, r00);
  	upd64083_write(sd, R02, r02);
  	return 0;
  }

  
  #ifdef CONFIG_VIDEO_ADV_DEBUG

  static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)

  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);

  	if (!v4l2_chip_match_i2c_client(client, &reg->match))

  		return -EINVAL;
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  	reg->val = upd64083_read(sd, reg->reg & 0xff);

  	reg->size = 1;

  	return 0;
  }

  static int upd64083_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)

  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);

  	if (!v4l2_chip_match_i2c_client(client, &reg->match))

  		return -EINVAL;
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  	upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
  	return 0;
  }

  #endif

  static int upd64083_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)

  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);
  
  	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_UPD64083, 0);
  }

  static int upd64083_log_status(struct v4l2_subdev *sd)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);
  	u8 buf[7];

  	i2c_master_recv(client, buf, 7);
  	v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
  		      "SA04=%02x SA05=%02x SA06=%02x
  ",
  		buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);

  	return 0;
  }

  static int upd64083_command(struct i2c_client *client, unsigned cmd, void *arg)
  {
  	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
  }
  
  /* ----------------------------------------------------------------------- */
  
  static const struct v4l2_subdev_core_ops upd64083_core_ops = {
  	.log_status = upd64083_log_status,
  	.g_chip_ident = upd64083_g_chip_ident,
  #ifdef CONFIG_VIDEO_ADV_DEBUG
  	.g_register = upd64083_g_register,
  	.s_register = upd64083_s_register,
  #endif
  };
  
  static const struct v4l2_subdev_video_ops upd64083_video_ops = {
  	.s_routing = upd64083_s_routing,
  };
  
  static const struct v4l2_subdev_ops upd64083_ops = {
  	.core = &upd64083_core_ops,
  	.video = &upd64083_video_ops,
  };

  /* ------------------------------------------------------------------------ */
  
  /* i2c implementation */

  static int upd64083_probe(struct i2c_client *client,
  			  const struct i2c_device_id *id)

  {

  	struct upd64083_state *state;

  	struct v4l2_subdev *sd;

  	int i;

  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))

  		return -EIO;

  	v4l_info(client, "chip found @ 0x%x (%s)
  ",
  			client->addr << 1, client->adapter->name);

  
  	state = kmalloc(sizeof(struct upd64083_state), GFP_KERNEL);

  	if (state == NULL)

  		return -ENOMEM;

  	sd = &state->sd;
  	v4l2_i2c_subdev_init(sd, client, &upd64083_ops);

  	/* Initially assume that a ghost reduction chip is present */
  	state->mode = 0;  /* YCS mode */
  	state->ext_y_adc = (1 << 5);
  	memcpy(state->regs, upd64083_init, TOT_REGS);

  	for (i = 0; i < TOT_REGS; i++)

  		upd64083_write(sd, i, state->regs[i]);

  	return 0;
  }

  static int upd64083_remove(struct i2c_client *client)

  {

  	struct v4l2_subdev *sd = i2c_get_clientdata(client);
  
  	v4l2_device_unregister_subdev(sd);
  	kfree(to_state(sd));

  	return 0;
  }
  
  /* ----------------------------------------------------------------------- */

  static const struct i2c_device_id upd64083_id[] = {
  	{ "upd64083", 0 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, upd64083_id);

  
  static struct v4l2_i2c_driver_data v4l2_i2c_data = {
  	.name = "upd64083",

  	.command = upd64083_command,

  	.probe = upd64083_probe,
  	.remove = upd64083_remove,

  	.id_table = upd64083_id,

  };