/* * 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_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev); 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 = devm_kzalloc(&client->dev, 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 = devm_mfd_add_devices(&client->dev, -1, core->cells, children, NULL, 0, NULL); if (r) goto err; return 0; err: pdata->free_resources(); 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, }; 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");