/*
   * MFD driver for wl1273 FM radio and audio codec submodules.
   *

   * Copyright (C) 2011 Nokia Corporation

   * Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * 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 St, Fifth Floor, Boston, MA
   * 02110-1301 USA
   *
   */
  
  #include <linux/mfd/wl1273-core.h>
  #include <linux/slab.h>

  #include <linux/module.h>

  
  #define DRIVER_DESC "WL1273 FM Radio Core"

  static const struct i2c_device_id wl1273_driver_id_table[] = {

  	{ WL1273_FM_DRIVER_NAME, 0 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);

  static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
  {
  	struct i2c_client *client = core->client;
  	u8 b[2];
  	int r;
  
  	r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
  	if (r != 2) {
  		dev_err(&client->dev, "%s: Read: %d fails.
  ", __func__, reg);
  		return -EREMOTEIO;
  	}
  
  	*value = (u16)b[0] << 8 | b[1];
  
  	return 0;
  }
  
  static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
  {
  	struct i2c_client *client = core->client;
  	u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
  	int r;
  
  	r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
  	if (r) {
  		dev_err(&client->dev, "%s: Cmd: %d fails.
  ", __func__, cmd);
  		return r;
  	}
  
  	return 0;
  }
  
  static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
  {
  	struct i2c_client *client = core->client;
  	struct i2c_msg msg;
  	int r;
  
  	msg.addr = client->addr;
  	msg.flags = 0;
  	msg.buf = data;
  	msg.len = len;
  
  	r = i2c_transfer(client->adapter, &msg, 1);
  	if (r != 1) {
  		dev_err(&client->dev, "%s: write error.
  ", __func__);
  		return -EREMOTEIO;
  	}
  
  	return 0;
  }
  
  /**
   * wl1273_fm_set_audio() -	Set audio mode.
   * @core:			A pointer to the device struct.
   * @new_mode:			The new audio mode.
   *
   * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
   */
  static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
  {
  	int r = 0;
  
  	if (core->mode == WL1273_MODE_OFF ||
  	    core->mode == WL1273_MODE_SUSPENDED)
  		return -EPERM;
  
  	if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
  		r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
  					WL1273_PCM_DEF_MODE);
  		if (r)
  			goto out;
  
  		r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
  					core->i2s_mode);
  		if (r)
  			goto out;
  
  		r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
  					WL1273_AUDIO_ENABLE_I2S);
  		if (r)
  			goto out;
  
  	} else if (core->mode == WL1273_MODE_RX &&
  		   new_mode == WL1273_AUDIO_ANALOG) {
  		r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
  					WL1273_AUDIO_ENABLE_ANALOG);
  		if (r)
  			goto out;
  
  	} else if (core->mode == WL1273_MODE_TX &&
  		   new_mode == WL1273_AUDIO_DIGITAL) {
  		r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
  					core->i2s_mode);
  		if (r)
  			goto out;
  
  		r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
  					WL1273_AUDIO_IO_SET_I2S);
  		if (r)
  			goto out;
  
  	} else if (core->mode == WL1273_MODE_TX &&
  		   new_mode == WL1273_AUDIO_ANALOG) {
  		r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
  					WL1273_AUDIO_IO_SET_ANALOG);
  		if (r)
  			goto out;
  	}
  
  	core->audio_mode = new_mode;
  out:
  	return r;
  }
  
  /**
   * wl1273_fm_set_volume() -	Set volume.
   * @core:			A pointer to the device struct.
   * @volume:			The new volume value.
   */
  static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
  {

  	int r;
  
  	if (volume > WL1273_MAX_VOLUME)
  		return -EINVAL;
  
  	if (core->volume == volume)
  		return 0;
  
  	r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
  	if (r)
  		return r;
  
  	core->volume = volume;
  	return 0;
  }

  static int wl1273_core_probe(struct i2c_client *client,

  				       const struct i2c_device_id *id)
  {

  	struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev);

  	struct wl1273_core *core;
  	struct mfd_cell *cell;
  	int children = 0;
  	int r = 0;
  
  	dev_dbg(&client->dev, "%s
  ", __func__);
  
  	if (!pdata) {
  		dev_err(&client->dev, "No platform data.
  ");
  		return -EINVAL;
  	}
  
  	if (!(pdata->children & WL1273_RADIO_CHILD)) {
  		dev_err(&client->dev, "Cannot function without radio child.
  ");
  		return -EINVAL;
  	}

  	core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);

  	if (!core)
  		return -ENOMEM;
  
  	core->pdata = pdata;
  	core->client = client;
  	mutex_init(&core->lock);
  
  	i2c_set_clientdata(client, core);
  
  	dev_dbg(&client->dev, "%s: Have V4L2.
  ", __func__);
  
  	cell = &core->cells[children];
  	cell->name = "wl1273_fm_radio";

  	cell->platform_data = &core;
  	cell->pdata_size = sizeof(core);

  	children++;

  	core->read = wl1273_fm_read_reg;
  	core->write = wl1273_fm_write_cmd;
  	core->write_data = wl1273_fm_write_data;
  	core->set_audio = wl1273_fm_set_audio;
  	core->set_volume = wl1273_fm_set_volume;

  	if (pdata->children & WL1273_CODEC_CHILD) {
  		cell = &core->cells[children];
  
  		dev_dbg(&client->dev, "%s: Have codec.
  ", __func__);
  		cell->name = "wl1273-codec";

  		cell->platform_data = &core;
  		cell->pdata_size = sizeof(core);

  		children++;
  	}
  
  	dev_dbg(&client->dev, "%s: number of children: %d.
  ",
  		__func__, children);

  	r = devm_mfd_add_devices(&client->dev, -1, core->cells,
  				 children, NULL, 0, NULL);

  	if (r)
  		goto err;
  
  	return 0;
  
  err:

  	pdata->free_resources();

  
  	dev_dbg(&client->dev, "%s
  ", __func__);
  
  	return r;
  }
  
  static struct i2c_driver wl1273_core_driver = {
  	.driver = {
  		.name = WL1273_FM_DRIVER_NAME,
  	},
  	.probe = wl1273_core_probe,
  	.id_table = wl1273_driver_id_table,

  };
  
  static int __init wl1273_core_init(void)
  {
  	int r;
  
  	r = i2c_add_driver(&wl1273_core_driver);
  	if (r) {
  		pr_err(WL1273_FM_DRIVER_NAME
  		       ": driver registration failed
  ");
  		return r;
  	}
  
  	return r;
  }
  
  static void __exit wl1273_core_exit(void)
  {
  	i2c_del_driver(&wl1273_core_driver);
  }
  late_initcall(wl1273_core_init);
  module_exit(wl1273_core_exit);
  
  MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");