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/*
* vp27smpx - driver version 0.0.1
*
* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
*
* Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
* and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
*
* 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>
MODULE_DESCRIPTION("vp27smpx driver");
MODULE_AUTHOR("Hans Verkuil");
MODULE_LICENSE("GPL");
/* ----------------------------------------------------------------------- */
struct vp27smpx_state {
struct v4l2_subdev sd;
int radio;
u32 audmode;
};
static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct vp27smpx_state, sd);
}
static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
{
struct vp27smpx_state *state = to_state(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
u8 data[3] = { 0x00, 0x00, 0x04 };
switch (audmode) {
case V4L2_TUNER_MODE_MONO:
case V4L2_TUNER_MODE_LANG1:
break;
case V4L2_TUNER_MODE_STEREO:
case V4L2_TUNER_MODE_LANG1_LANG2:
data[1] = 0x01;
break;
case V4L2_TUNER_MODE_LANG2:
data[1] = 0x02;
break;
}
if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
v4l2_err(sd, "I/O error setting audmode\n");
else
state->audmode = audmode;
}
static int vp27smpx_s_radio(struct v4l2_subdev *sd)
{
struct vp27smpx_state *state = to_state(sd);
state->radio = 1;
return 0;
}
static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
{
struct vp27smpx_state *state = to_state(sd);
state->radio = 0;
return 0;
}
static int vp27smpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
{
struct vp27smpx_state *state = to_state(sd);
if (!state->radio)
vp27smpx_set_audmode(sd, vt->audmode);
return 0;
}
static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
{
struct vp27smpx_state *state = to_state(sd);
if (state->radio)
return 0;
vt->audmode = state->audmode;
vt->capability = V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
vt->rxsubchans = V4L2_TUNER_SUB_MONO;
return 0;
}
static int vp27smpx_log_status(struct v4l2_subdev *sd)
{
struct vp27smpx_state *state = to_state(sd);
v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
state->radio ? " (Radio)" : "");
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
.log_status = vp27smpx_log_status,
.s_std = vp27smpx_s_std,
};
static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
.s_radio = vp27smpx_s_radio,
.s_tuner = vp27smpx_s_tuner,
.g_tuner = vp27smpx_g_tuner,
};
static const struct v4l2_subdev_ops vp27smpx_ops = {
.core = &vp27smpx_core_ops,
.tuner = &vp27smpx_tuner_ops,
};
/* ----------------------------------------------------------------------- */
/* i2c implementation */
/*
* Generic i2c probe
* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
*/
static int vp27smpx_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct vp27smpx_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 = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
if (state == NULL)
return -ENOMEM;
sd = &state->sd;
v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
state->audmode = V4L2_TUNER_MODE_STEREO;
/* initialize vp27smpx */
vp27smpx_set_audmode(sd, state->audmode);
return 0;
}
static int vp27smpx_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct i2c_device_id vp27smpx_id[] = {
{ "vp27smpx", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
static struct i2c_driver vp27smpx_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "vp27smpx",
},
.probe = vp27smpx_probe,
.remove = vp27smpx_remove,
.id_table = vp27smpx_id,
};
module_i2c_driver(vp27smpx_driver);
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