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* MFD driver for wl1273 FM radio and audio codec submodules.
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* Copyright (C) 2011 Nokia Corporation
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* Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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#include <linux/mfd/wl1273-core.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#define DRIVER_DESC "WL1273 FM Radio Core"
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static const struct i2c_device_id wl1273_driver_id_table[] = {
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{ WL1273_FM_DRIVER_NAME, 0 },
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MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
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static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
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struct i2c_client *client = core->client;
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r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
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dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
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*value = (u16)b[0] << 8 | b[1];
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static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
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struct i2c_client *client = core->client;
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u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
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r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
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dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
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static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
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struct i2c_client *client = core->client;
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msg.addr = client->addr;
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r = i2c_transfer(client->adapter, &msg, 1);
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dev_err(&client->dev, "%s: write error.\n", __func__);
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* wl1273_fm_set_audio() - Set audio mode.
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* @core: A pointer to the device struct.
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* @new_mode: The new audio mode.
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* Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
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static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
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if (core->mode == WL1273_MODE_OFF ||
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core->mode == WL1273_MODE_SUSPENDED)
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if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
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r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
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WL1273_PCM_DEF_MODE);
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r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
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r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
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WL1273_AUDIO_ENABLE_I2S);
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} else if (core->mode == WL1273_MODE_RX &&
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new_mode == WL1273_AUDIO_ANALOG) {
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r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
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WL1273_AUDIO_ENABLE_ANALOG);
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} else if (core->mode == WL1273_MODE_TX &&
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new_mode == WL1273_AUDIO_DIGITAL) {
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r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
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r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
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WL1273_AUDIO_IO_SET_I2S);
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} else if (core->mode == WL1273_MODE_TX &&
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new_mode == WL1273_AUDIO_ANALOG) {
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r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
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WL1273_AUDIO_IO_SET_ANALOG);
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core->audio_mode = new_mode;
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* wl1273_fm_set_volume() - Set volume.
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* @core: A pointer to the device struct.
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* @volume: The new volume value.
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static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
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if (volume > WL1273_MAX_VOLUME)
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if (core->volume == volume)
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r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
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core->volume = volume;
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static int wl1273_core_remove(struct i2c_client *client)
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struct wl1273_core *core = i2c_get_clientdata(client);
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dev_dbg(&client->dev, "%s\n", __func__);
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mfd_remove_devices(&client->dev);
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static int __devinit wl1273_core_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
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struct wl1273_core *core;
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struct mfd_cell *cell;
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dev_dbg(&client->dev, "%s\n", __func__);
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dev_err(&client->dev, "No platform data.\n");
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if (!(pdata->children & WL1273_RADIO_CHILD)) {
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dev_err(&client->dev, "Cannot function without radio child.\n");
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core = kzalloc(sizeof(*core), GFP_KERNEL);
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core->client = client;
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mutex_init(&core->lock);
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i2c_set_clientdata(client, core);
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dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
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cell = &core->cells[children];
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cell->name = "wl1273_fm_radio";
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cell->platform_data = &core;
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cell->pdata_size = sizeof(core);
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core->read = wl1273_fm_read_reg;
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core->write = wl1273_fm_write_cmd;
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core->write_data = wl1273_fm_write_data;
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core->set_audio = wl1273_fm_set_audio;
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core->set_volume = wl1273_fm_set_volume;
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if (pdata->children & WL1273_CODEC_CHILD) {
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cell = &core->cells[children];
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dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
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cell->name = "wl1273-codec";
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cell->platform_data = &core;
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cell->pdata_size = sizeof(core);
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dev_dbg(&client->dev, "%s: number of children: %d.\n",
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r = mfd_add_devices(&client->dev, -1, core->cells,
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pdata->free_resources();
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dev_dbg(&client->dev, "%s\n", __func__);
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static struct i2c_driver wl1273_core_driver = {
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.name = WL1273_FM_DRIVER_NAME,
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.probe = wl1273_core_probe,
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.id_table = wl1273_driver_id_table,
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.remove = __devexit_p(wl1273_core_remove),
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static int __init wl1273_core_init(void)
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r = i2c_add_driver(&wl1273_core_driver);
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pr_err(WL1273_FM_DRIVER_NAME
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": driver registration failed\n");
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static void __exit wl1273_core_exit(void)
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i2c_del_driver(&wl1273_core_driver);
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late_initcall(wl1273_core_init);
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module_exit(wl1273_core_exit);
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MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");