/*
   * tlv320aic23b - driver version 0.0.1
   *
   * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
   *
   * Based on wm8775 driver
   *
   * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
   * Copyright (C) 2005 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., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/ioctl.h>
  #include <asm/uaccess.h>
  #include <linux/i2c.h>
  #include <linux/i2c-id.h>

  #include <linux/videodev2.h>

  #include <media/v4l2-device.h>

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

  
  MODULE_DESCRIPTION("tlv320aic23b driver");
  MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  MODULE_LICENSE("GPL");
  
  static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };

  I2C_CLIENT_INSMOD;
  
  /* ----------------------------------------------------------------------- */
  
  struct tlv320aic23b_state {

  	struct v4l2_subdev sd;

  	u8 muted;
  };

  static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)

  {

  	return container_of(sd, struct tlv320aic23b_state, sd);
  }
  
  static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);

  	int i;
  
  	if ((reg < 0 || reg > 9) && (reg != 15)) {

  		v4l2_err(sd, "Invalid register R%d
  ", reg);

  		return -1;
  	}

  	for (i = 0; i < 3; i++)
  		if (i2c_smbus_write_byte_data(client,
  				(reg << 1) | (val >> 8), val & 0xff) == 0)

  			return 0;

  	v4l2_err(sd, "I2C: cannot write %03x to register R%d
  ", val, reg);

  	return -1;
  }

  static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)

  {

  	switch (freq) {
  	case 32000: /* set sample rate to 32 kHz */
  		tlv320aic23b_write(sd, 8, 0x018);

  		break;

  	case 44100: /* set sample rate to 44.1 kHz */
  		tlv320aic23b_write(sd, 8, 0x022);

  		break;

  	case 48000: /* set sample rate to 48 kHz */
  		tlv320aic23b_write(sd, 8, 0x000);

  		break;

  	default:
  		return -EINVAL;
  	}
  	return 0;
  }

  static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  {
  	struct tlv320aic23b_state *state = to_state(sd);
  
  	if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  		return -EINVAL;
  	ctrl->value = state->muted;
  	return 0;
  }
  
  static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  {
  	struct tlv320aic23b_state *state = to_state(sd);
  
  	if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  		return -EINVAL;
  	state->muted = ctrl->value;
  	tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
  	/* set gain on both channels to +3.0 dB */
  	if (!state->muted)
  		tlv320aic23b_write(sd, 0, 0x119);
  	return 0;
  }
  
  static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
  {
  	struct tlv320aic23b_state *state = to_state(sd);
  
  	v4l2_info(sd, "Input: %s
  ", state->muted ? "muted" : "active");
  	return 0;
  }
  
  static int tlv320aic23b_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 tlv320aic23b_core_ops = {
  	.log_status = tlv320aic23b_log_status,
  	.g_ctrl = tlv320aic23b_g_ctrl,
  	.s_ctrl = tlv320aic23b_s_ctrl,
  };
  
  static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
  	.s_clock_freq = tlv320aic23b_s_clock_freq,
  };
  
  static const struct v4l2_subdev_ops tlv320aic23b_ops = {
  	.core = &tlv320aic23b_core_ops,
  	.audio = &tlv320aic23b_audio_ops,
  };

  /* ----------------------------------------------------------------------- */
  
  /* i2c implementation */
  
  /*
   * Generic i2c probe
   * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
   */

  static int tlv320aic23b_probe(struct i2c_client *client,
  			      const struct i2c_device_id *id)

  {

  	struct tlv320aic23b_state *state;

  	struct v4l2_subdev *sd;

  
  	/* Check if the adapter supports the needed features */

  	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 = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);

  	if (state == NULL)

  		return -ENOMEM;

  	sd = &state->sd;
  	v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);

  	state->muted = 0;

  	/* Initialize tlv320aic23b */
  
  	/* RESET */

  	tlv320aic23b_write(sd, 15, 0x000);

  	/* turn off DAC & mic input */

  	tlv320aic23b_write(sd, 6, 0x00A);

  	/* left-justified, 24-bit, master mode */

  	tlv320aic23b_write(sd, 7, 0x049);

  	/* set gain on both channels to +3.0 dB */

  	tlv320aic23b_write(sd, 0, 0x119);

  	/* set sample rate to 48 kHz */

  	tlv320aic23b_write(sd, 8, 0x000);

  	/* activate digital interface */

  	tlv320aic23b_write(sd, 9, 0x001);

  	return 0;
  }

  static int tlv320aic23b_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 tlv320aic23b_id[] = {
  	{ "tlv320aic23b", 0 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);

  static struct v4l2_i2c_driver_data v4l2_i2c_data = {
  	.name = "tlv320aic23b",

  	.command = tlv320aic23b_command,
  	.probe = tlv320aic23b_probe,
  	.remove = tlv320aic23b_remove,

  	.id_table = tlv320aic23b_id,

  };