[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mfd / wl1273-core.c

/*
 * 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.\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 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, NULL);
	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 = 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");
Commit	Line	Data
383268a8 MA	1	/*
	2	* MFD driver for wl1273 FM radio and audio codec submodules.
	3	*
94fd5b74	4	* Copyright (C) 2011 Nokia Corporation
383268a8 MA	5	* Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*
	21	*/
	22
	23	#include <linux/mfd/wl1273-core.h>
	24	#include <linux/slab.h>
4e36dd33	25	#include <linux/module.h>
383268a8 MA	26
	27	#define DRIVER_DESC "WL1273 FM Radio Core"
	28
1206552b	29	static const struct i2c_device_id wl1273_driver_id_table[] = {
383268a8 MA	30	{ WL1273_FM_DRIVER_NAME, 0 },
	31	{ }
	32	};
	33	MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
	34
94fd5b74 MA	35	static int wl1273_fm_read_reg(struct wl1273_core core, u8 reg, u16 value)
	36	{
	37	struct i2c_client *client = core->client;
	38	u8 b[2];
	39	int r;
	40
	41	r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
	42	if (r != 2) {
	43	dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
	44	return -EREMOTEIO;
	45	}
	46
	47	*value = (u16)b[0] << 8 \| b[1];
	48
	49	return 0;
	50	}
	51
	52	static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
	53	{
	54	struct i2c_client *client = core->client;
	55	u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
	56	int r;
	57
	58	r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
	59	if (r) {
	60	dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
	61	return r;
	62	}
	63
	64	return 0;
	65	}
	66
	67	static int wl1273_fm_write_data(struct wl1273_core core, u8 data, u16 len)
	68	{
	69	struct i2c_client *client = core->client;
	70	struct i2c_msg msg;
	71	int r;
	72
	73	msg.addr = client->addr;
	74	msg.flags = 0;
	75	msg.buf = data;
	76	msg.len = len;
	77
	78	r = i2c_transfer(client->adapter, &msg, 1);
	79	if (r != 1) {
	80	dev_err(&client->dev, "%s: write error.\n", __func__);
	81	return -EREMOTEIO;
	82	}
	83
	84	return 0;
	85	}
	86
	87	/**
	88	* wl1273_fm_set_audio() - Set audio mode.
	89	* @core: A pointer to the device struct.
	90	* @new_mode: The new audio mode.
	91	*
	92	* Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
	93	*/
	94	static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
	95	{
	96	int r = 0;
	97
	98	if (core->mode == WL1273_MODE_OFF \|\|
99	core->mode == WL1273_MODE_SUSPENDED)
100	return -EPERM;
101
102	if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
103	r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
104	WL1273_PCM_DEF_MODE);
105	if (r)
106	goto out;
107
108	r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
109	core->i2s_mode);
110	if (r)
111	goto out;
112
113	r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
114	WL1273_AUDIO_ENABLE_I2S);
115	if (r)
116	goto out;
117
118	} else if (core->mode == WL1273_MODE_RX &&
119	new_mode == WL1273_AUDIO_ANALOG) {
120	r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
121	WL1273_AUDIO_ENABLE_ANALOG);
122	if (r)
123	goto out;
124
125	} else if (core->mode == WL1273_MODE_TX &&
126	new_mode == WL1273_AUDIO_DIGITAL) {
127	r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
128	core->i2s_mode);
129	if (r)
130	goto out;
131
132	r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
133	WL1273_AUDIO_IO_SET_I2S);
134	if (r)
135	goto out;
136
137	} else if (core->mode == WL1273_MODE_TX &&
138	new_mode == WL1273_AUDIO_ANALOG) {
139	r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
140	WL1273_AUDIO_IO_SET_ANALOG);
141	if (r)
142	goto out;
143	}
144
145	core->audio_mode = new_mode;
146	out:
147	return r;
148	}
149
150	/**
151	* wl1273_fm_set_volume() - Set volume.
152	* @core: A pointer to the device struct.
153	* @volume: The new volume value.
154	*/
155	static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
156	{
94fd5b74 MA	157	int r;
	158
	159	if (volume > WL1273_MAX_VOLUME)
	160	return -EINVAL;
	161
	162	if (core->volume == volume)
	163	return 0;
	164
	165	r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
	166	if (r)
	167	return r;
	168
	169	core->volume = volume;
	170	return 0;
	171	}
	172
383268a8 MA	173	static int wl1273_core_remove(struct i2c_client *client)
	174	{
	175	struct wl1273_core *core = i2c_get_clientdata(client);
	176
	177	dev_dbg(&client->dev, "%s\n", __func__);
	178
	179	mfd_remove_devices(&client->dev);
383268a8 MA	180	kfree(core);
	181
	182	return 0;
	183	}
	184
f791be49	185	static int wl1273_core_probe(struct i2c_client *client,
383268a8 MA	186	const struct i2c_device_id *id)
	187	{
	188	struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
	189	struct wl1273_core *core;
	190	struct mfd_cell *cell;
	191	int children = 0;
	192	int r = 0;
	193
	194	dev_dbg(&client->dev, "%s\n", __func__);
	195
	196	if (!pdata) {
	197	dev_err(&client->dev, "No platform data.\n");
	198	return -EINVAL;
	199	}
	200
	201	if (!(pdata->children & WL1273_RADIO_CHILD)) {
	202	dev_err(&client->dev, "Cannot function without radio child.\n");
	203	return -EINVAL;
	204	}
	205
	206	core = kzalloc(sizeof(*core), GFP_KERNEL);
	207	if (!core)
	208	return -ENOMEM;
	209
	210	core->pdata = pdata;
	211	core->client = client;
	212	mutex_init(&core->lock);
	213
	214	i2c_set_clientdata(client, core);
	215
	216	dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
	217
	218	cell = &core->cells[children];
	219	cell->name = "wl1273_fm_radio";
9e554696 SO	220	cell->platform_data = &core;
9e554696 SO	221	cell->pdata_size = sizeof(core);
383268a8 MA	222	children++;
383268a8 MA	223
94fd5b74 MA	224	core->read = wl1273_fm_read_reg;
	225	core->write = wl1273_fm_write_cmd;
	226	core->write_data = wl1273_fm_write_data;
	227	core->set_audio = wl1273_fm_set_audio;
	228	core->set_volume = wl1273_fm_set_volume;
	229
383268a8 MA	230	if (pdata->children & WL1273_CODEC_CHILD) {
	231	cell = &core->cells[children];
	232
	233	dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
	234	cell->name = "wl1273-codec";
9e554696 SO	235	cell->platform_data = &core;
9e554696 SO	236	cell->pdata_size = sizeof(core);
383268a8 MA	237	children++;
	238	}
	239
	240	dev_dbg(&client->dev, "%s: number of children: %d.\n",
	241	__func__, children);
	242
	243	r = mfd_add_devices(&client->dev, -1, core->cells,
0848c94f	244	children, NULL, 0, NULL);
383268a8 MA	245	if (r)
	246	goto err;
	247
	248	return 0;
	249
	250	err:
383268a8 MA	251	pdata->free_resources();
	252	kfree(core);
	253
	254	dev_dbg(&client->dev, "%s\n", __func__);
	255
	256	return r;
	257	}
	258
	259	static struct i2c_driver wl1273_core_driver = {
	260	.driver = {
	261	.name = WL1273_FM_DRIVER_NAME,
	262	},
	263	.probe = wl1273_core_probe,
	264	.id_table = wl1273_driver_id_table,
84449216	265	.remove = wl1273_core_remove,
383268a8 MA	266	};
	267
	268	static int __init wl1273_core_init(void)
	269	{
	270	int r;
	271
	272	r = i2c_add_driver(&wl1273_core_driver);
	273	if (r) {
	274	pr_err(WL1273_FM_DRIVER_NAME
	275	": driver registration failed\n");
	276	return r;
	277	}
	278
	279	return r;
	280	}
	281
	282	static void __exit wl1273_core_exit(void)
	283	{
	284	i2c_del_driver(&wl1273_core_driver);
	285	}
	286	late_initcall(wl1273_core_init);
	287	module_exit(wl1273_core_exit);
	288
	289	MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
	290	MODULE_DESCRIPTION(DRIVER_DESC);
	291	MODULE_LICENSE("GPL");