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263 lines
5.7 KiB
263 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* MFD driver for wl1273 FM radio and audio codec submodules. |
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* |
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* Copyright (C) 2011 Nokia Corporation |
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* Author: Matti Aaltonen <[email protected]> |
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*/ |
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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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{ } |
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}; |
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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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{ |
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struct i2c_client *client = core->client; |
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u8 b[2]; |
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int r; |
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r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b); |
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if (r != 2) { |
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dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg); |
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return -EREMOTEIO; |
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} |
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*value = (u16)b[0] << 8 | b[1]; |
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return 0; |
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} |
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static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param) |
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{ |
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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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int r; |
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r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf); |
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if (r) { |
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dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd); |
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return r; |
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} |
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return 0; |
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} |
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static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len) |
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{ |
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struct i2c_client *client = core->client; |
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struct i2c_msg msg; |
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int r; |
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msg.addr = client->addr; |
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msg.flags = 0; |
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msg.buf = data; |
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msg.len = len; |
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r = i2c_transfer(client->adapter, &msg, 1); |
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if (r != 1) { |
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dev_err(&client->dev, "%s: write error.\n", __func__); |
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return -EREMOTEIO; |
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} |
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return 0; |
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} |
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/** |
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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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* |
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* Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG. |
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*/ |
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static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode) |
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{ |
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int r = 0; |
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if (core->mode == WL1273_MODE_OFF || |
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core->mode == WL1273_MODE_SUSPENDED) |
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return -EPERM; |
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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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if (r) |
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goto out; |
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r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET, |
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core->i2s_mode); |
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if (r) |
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goto out; |
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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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if (r) |
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goto out; |
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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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if (r) |
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goto out; |
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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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core->i2s_mode); |
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if (r) |
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goto out; |
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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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if (r) |
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goto out; |
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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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if (r) |
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goto out; |
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} |
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core->audio_mode = new_mode; |
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out: |
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return r; |
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} |
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/** |
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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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*/ |
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static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume) |
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{ |
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int r; |
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if (volume > WL1273_MAX_VOLUME) |
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return -EINVAL; |
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if (core->volume == volume) |
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return 0; |
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r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume); |
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if (r) |
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return r; |
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core->volume = volume; |
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return 0; |
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} |
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static int wl1273_core_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev); |
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struct wl1273_core *core; |
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struct mfd_cell *cell; |
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int children = 0; |
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int r = 0; |
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dev_dbg(&client->dev, "%s\n", __func__); |
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if (!pdata) { |
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dev_err(&client->dev, "No platform data.\n"); |
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return -EINVAL; |
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} |
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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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return -EINVAL; |
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} |
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core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL); |
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if (!core) |
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return -ENOMEM; |
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core->pdata = pdata; |
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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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children++; |
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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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children++; |
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} |
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dev_dbg(&client->dev, "%s: number of children: %d.\n", |
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__func__, children); |
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r = devm_mfd_add_devices(&client->dev, -1, core->cells, |
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children, NULL, 0, NULL); |
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if (r) |
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goto err; |
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return 0; |
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err: |
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pdata->free_resources(); |
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dev_dbg(&client->dev, "%s\n", __func__); |
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return r; |
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} |
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static struct i2c_driver wl1273_core_driver = { |
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.driver = { |
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.name = WL1273_FM_DRIVER_NAME, |
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}, |
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.probe = wl1273_core_probe, |
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.id_table = wl1273_driver_id_table, |
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}; |
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static int __init wl1273_core_init(void) |
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{ |
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int r; |
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r = i2c_add_driver(&wl1273_core_driver); |
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if (r) { |
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pr_err(WL1273_FM_DRIVER_NAME |
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": driver registration failed\n"); |
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return r; |
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} |
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return r; |
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} |
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static void __exit wl1273_core_exit(void) |
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{ |
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i2c_del_driver(&wl1273_core_driver); |
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} |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL");
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