Quelle  wl1273-core.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * MFD driver for wl1273 FM radio and audio codec submodules.
 *
 * Copyright (C) 2011 Nokia Corporation
 * Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
 */

#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 },
 { }
};
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)
{
 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 ");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");