tlv320aic23b.c

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/*
 * tlv320aic23b - driver version 0.0.1
 *
 * Copyright (C) 2006 Scott Alfter <[email protected]>
 *
 * Based on wm8775 driver
 *
 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
 * Copyright (C) 2005 Hans Verkuil <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>

MODULE_DESCRIPTION("tlv320aic23b driver");
MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
MODULE_LICENSE("GPL");


/* ----------------------------------------------------------------------- */

struct tlv320aic23b_state {
    struct v4l2_subdev sd;
    struct v4l2_ctrl_handler hdl;
};

static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
{
    return container_of(sd, struct tlv320aic23b_state, sd);
}

static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
{
    return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
}

static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);
    int i;

    if ((reg < 0 || reg > 9) && (reg != 15)) {
        v4l2_err(sd, "Invalid register R%d\n", reg);
        return -1;
    }

    for (i = 0; i < 3; i++)
        if (i2c_smbus_write_byte_data(client,
                (reg << 1) | (val >> 8), val & 0xff) == 0)
            return 0;
    v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
    return -1;
}

static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
{
    switch (freq) {
    case 32000: /* set sample rate to 32 kHz */
        tlv320aic23b_write(sd, 8, 0x018);
        break;
    case 44100: /* set sample rate to 44.1 kHz */
        tlv320aic23b_write(sd, 8, 0x022);
        break;
    case 48000: /* set sample rate to 48 kHz */
        tlv320aic23b_write(sd, 8, 0x000);
        break;
    default:
        return -EINVAL;
    }
    return 0;
}

static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
{
    struct v4l2_subdev *sd = to_sd(ctrl);

    switch (ctrl->id) {
    case V4L2_CID_AUDIO_MUTE:
        tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
        /* set gain on both channels to +3.0 dB */
        if (!ctrl->val)
            tlv320aic23b_write(sd, 0, 0x119);
        return 0;
    }
    return -EINVAL;
}

static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
{
    struct tlv320aic23b_state *state = to_state(sd);

    v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
    return 0;
}

/* ----------------------------------------------------------------------- */

static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
    .s_ctrl = tlv320aic23b_s_ctrl,
};

static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
    .log_status = tlv320aic23b_log_status,
    .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
    .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
    .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
    .g_ctrl = v4l2_subdev_g_ctrl,
    .s_ctrl = v4l2_subdev_s_ctrl,
    .queryctrl = v4l2_subdev_queryctrl,
    .querymenu = v4l2_subdev_querymenu,
};

static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
    .s_clock_freq = tlv320aic23b_s_clock_freq,
};

static const struct v4l2_subdev_ops tlv320aic23b_ops = {
    .core = &tlv320aic23b_core_ops,
    .audio = &tlv320aic23b_audio_ops,
};

/* ----------------------------------------------------------------------- */

/* i2c implementation */

/*
 * Generic i2c probe
 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 */

static int tlv320aic23b_probe(struct i2c_client *client,
                  const struct i2c_device_id *id)
{
    struct tlv320aic23b_state *state;
    struct v4l2_subdev *sd;

    /* Check if the adapter supports the needed features */
    if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
        return -EIO;

    v4l_info(client, "chip found @ 0x%x (%s)\n",
            client->addr << 1, client->adapter->name);

    state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
    if (state == NULL)
        return -ENOMEM;
    sd = &state->sd;
    v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);

    /* Initialize tlv320aic23b */

    /* RESET */
    tlv320aic23b_write(sd, 15, 0x000);
    /* turn off DAC & mic input */
    tlv320aic23b_write(sd, 6, 0x00A);
    /* left-justified, 24-bit, master mode */
    tlv320aic23b_write(sd, 7, 0x049);
    /* set gain on both channels to +3.0 dB */
    tlv320aic23b_write(sd, 0, 0x119);
    /* set sample rate to 48 kHz */
    tlv320aic23b_write(sd, 8, 0x000);
    /* activate digital interface */
    tlv320aic23b_write(sd, 9, 0x001);

    v4l2_ctrl_handler_init(&state->hdl, 1);
    v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
            V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
    sd->ctrl_handler = &state->hdl;
    if (state->hdl.error) {
        int err = state->hdl.error;

        v4l2_ctrl_handler_free(&state->hdl);
        kfree(state);
        return err;
    }
    v4l2_ctrl_handler_setup(&state->hdl);
    return 0;
}

static int tlv320aic23b_remove(struct i2c_client *client)
{
    struct v4l2_subdev *sd = i2c_get_clientdata(client);
    struct tlv320aic23b_state *state = to_state(sd);

    v4l2_device_unregister_subdev(sd);
    v4l2_ctrl_handler_free(&state->hdl);
    kfree(state);
    return 0;
}

/* ----------------------------------------------------------------------- */

static const struct i2c_device_id tlv320aic23b_id[] = {
    { "tlv320aic23b", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);

static struct i2c_driver tlv320aic23b_driver = {
    .driver = {
        .owner  = THIS_MODULE,
        .name   = "tlv320aic23b",
    },
    .probe      = tlv320aic23b_probe,
    .remove     = tlv320aic23b_remove,
    .id_table   = tlv320aic23b_id,
};

module_i2c_driver(tlv320aic23b_driver);