wl1273-core.c

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/*
 * MFD driver for wl1273 FM radio and audio codec submodules.
 *
 * Copyright (C) 2011 Nokia Corporation
 * Author: Matti Aaltonen <[email protected]>
 *
 * 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;
}

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;
}

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_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->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 = mfd_add_devices(&client->dev, -1, core->cells,
                children, NULL, 0, NULL);
    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 <[email protected]>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");