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[media] MFD: WL1273 FM Radio: MFD driver for the FM radio 

This is the core of the WL1273 FM radio driver, it connects
the two child modules. The two child drivers are
drivers/media/radio/radio-wl1273.c and sound/soc/codecs/wl1273.c.

The radio-wl1273 driver implements the V4L2 interface and communicates
with the device. The ALSA codec offers digital audio, without it only
analog audio is available.

Signed-off-by: Matti J. Aaltonen <matti.j.aaltonen@nokia.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Matti Aaltonen 2011-03-01 10:10:35 -03:00 committed by Mauro Carvalho Chehab
parent 3822f18d8f
commit 94fd5b7401
3 changed files with 149 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/mfd/Kconfig
View File

@ -615,7 +615,7 @@ config MFD_VX855
and/or vx855_gpio drivers for this to do anything useful.
config MFD_WL1273_CORE
tristate
tristate "Support for TI WL1273 FM radio."
depends on I2C
select MFD_CORE
default n

149
drivers/mfd/wl1273-core.c
View File

@ -1,7 +1,7 @@
/*
* MFD driver for wl1273 FM radio and audio codec submodules.
*
* Copyright (C) 2010 Nokia Corporation
* 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
@ -31,6 +31,145 @@ static struct i2c_device_id wl1273_driver_id_table[] = {
};
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)
{
u16 val;
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);
@ -38,7 +177,6 @@ static int wl1273_core_remove(struct i2c_client *client)
dev_dbg(&client->dev, "%s\n", __func__);
mfd_remove_devices(&client->dev);
i2c_set_clientdata(client, NULL);
kfree(core);
return 0;
@ -83,6 +221,12 @@ static int __devinit wl1273_core_probe(struct i2c_client *client,
cell->data_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];
@ -104,7 +248,6 @@ static int __devinit wl1273_core_probe(struct i2c_client *client,
return 0;
err:
i2c_set_clientdata(client, NULL);
pdata->free_resources();
kfree(core);

2
include/linux/mfd/wl1273-core.h
View File

@ -280,7 +280,9 @@ struct wl1273_core {
struct i2c_client *client;
int (*read)(struct wl1273_core *core, u8, u16 *);
int (*write)(struct wl1273_core *core, u8, u16);
int (*write_data)(struct wl1273_core *core, u8 *, u16);
int (*set_audio)(struct wl1273_core *core, unsigned int);
int (*set_volume)(struct wl1273_core *core, unsigned int);
};