| /* |
| * 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 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) |
| { |
| 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); |
| |
| 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->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]; |
| |
| dev_dbg(&client->dev, "%s: Have codec.\n", __func__); |
| cell->name = "wl1273-codec"; |
| cell->platform_data = &core; |
| cell->data_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"); |