drivers/mfd/wl1273-core.c - maze/linux - Git at Google

 /*
  * 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>

 #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.\n", __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.\n", __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.\n", __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_remove(struct i2c_client *client)
 {
 	struct wl1273_core *core = i2c_get_clientdata(client);

 	dev_dbg(&client->dev, "%s\n", __func__);

 	mfd_remove_devices(&client->dev);
 	kfree(core);

 	return 0;
 }

 static int __devinit wl1273_core_probe(struct i2c_client *client,
 				       const struct i2c_device_id *id)
 {
 	struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
 	struct wl1273_core *core;
 	struct mfd_cell *cell;
 	int children = 0;
 	int r = 0;

 	dev_dbg(&client->dev, "%s\n", __func__);

 	if (!pdata) {
 		dev_err(&client->dev, "No platform data.\n");
 		return -EINVAL;
 	}

 	if (!(pdata->children & WL1273_RADIO_CHILD)) {
 		dev_err(&client->dev, "Cannot function without radio child.\n");
 		return -EINVAL;
 	}

 	core = kzalloc(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.\n", __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.\n", __func__);
 		cell->name = "wl1273-codec";
 		cell->platform_data = &core;
 		cell->pdata_size = sizeof(core);
 		children++;
 	}

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

 	r = mfd_add_devices(&client->dev, -1, core->cells,
 			    children, NULL, 0);
 	if (r)
 		goto err;

 	return 0;

 err:
 	pdata->free_resources();
 	kfree(core);

 	dev_dbg(&client->dev, "%s\n", __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,
 	.remove = __devexit_p(wl1273_core_remove),
 };

 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\n");
 		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");
	/*
	* 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>

	#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.\n", __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.\n", __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.\n", __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_remove(struct i2c_client *client)
	{
	struct wl1273_core *core = i2c_get_clientdata(client);

	dev_dbg(&client->dev, "%s\n", __func__);

	mfd_remove_devices(&client->dev);
	kfree(core);

	return 0;
	}

	static int __devinit wl1273_core_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
	struct wl1273_core *core;
	struct mfd_cell *cell;
	int children = 0;
	int r = 0;

	dev_dbg(&client->dev, "%s\n", __func__);

	if (!pdata) {
	dev_err(&client->dev, "No platform data.\n");
	return -EINVAL;
	}

	if (!(pdata->children & WL1273_RADIO_CHILD)) {
	dev_err(&client->dev, "Cannot function without radio child.\n");
	return -EINVAL;
	}

	core = kzalloc(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.\n", __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.\n", __func__);
	cell->name = "wl1273-codec";
	cell->platform_data = &core;
	cell->pdata_size = sizeof(core);
	children++;
	}

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

	r = mfd_add_devices(&client->dev, -1, core->cells,
	children, NULL, 0);
	if (r)
	goto err;

	return 0;

	err:
	pdata->free_resources();
	kfree(core);

	dev_dbg(&client->dev, "%s\n", __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,
	.remove = __devexit_p(wl1273_core_remove),
	};

	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\n");
	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");