/*
 * 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");