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/*
* vp27smpx - driver version 0.0.1
*
* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
*
* Based on a tvaudio patch from 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/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
MODULE_DESCRIPTION("vp27smpx driver");
MODULE_AUTHOR("Hans Verkuil");
MODULE_LICENSE("GPL");
static unsigned short normal_i2c[] = { 0xb6 >> 1, I2C_CLIENT_END };
I2C_CLIENT_INSMOD;
/* ----------------------------------------------------------------------- */
struct vp27smpx_state {
int radio;
u32 audmode;
};
static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
{
struct vp27smpx_state *state = i2c_get_clientdata(client);
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)) {
v4l_err(client, "%s: I/O error setting audmode\n", client->name);
}
else {
state->audmode = audmode;
}
}
static int vp27smpx_command(struct i2c_client *client, unsigned int cmd,
void *arg)
{
struct vp27smpx_state *state = i2c_get_clientdata(client);
struct v4l2_tuner *vt = arg;
switch (cmd) {
case AUDC_SET_RADIO:
state->radio = 1;
break;
case VIDIOC_S_STD:
state->radio = 0;
break;
case VIDIOC_S_TUNER:
if (!state->radio)
vp27smpx_set_audmode(client, vt->audmode);
break;
case VIDIOC_G_TUNER:
if (state->radio)
break;
vt->audmode = state->audmode;
vt->capability = V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
vt->rxsubchans = V4L2_TUNER_SUB_MONO;
break;
case VIDIOC_G_CHIP_IDENT:
return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_VP27SMPX, 0);
case VIDIOC_LOG_STATUS:
v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
state->radio ? " (Radio)" : "");
break;
default:
return -EINVAL;
}
return 0;
}
/* ----------------------------------------------------------------------- */
/* i2c implementation */
/*
* Generic i2c probe
* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
*/
static struct i2c_driver i2c_driver;
static int vp27smpx_attach(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *client;
struct vp27smpx_state *state;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return 0;
client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (client == 0)
return -ENOMEM;
client->addr = address;
client->adapter = adapter;
client->driver = &i2c_driver;
snprintf(client->name, sizeof(client->name) - 1, "vp27smpx");
v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
if (state == NULL) {
kfree(client);
return -ENOMEM;
}
state->audmode = V4L2_TUNER_MODE_STEREO;
i2c_set_clientdata(client, state);
/* initialize vp27smpx */
vp27smpx_set_audmode(client, state->audmode);
i2c_attach_client(client);
return 0;
}
static int vp27smpx_probe(struct i2c_adapter *adapter)
{
if (adapter->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adapter, &addr_data, vp27smpx_attach);
return 0;
}
static int vp27smpx_detach(struct i2c_client *client)
{
struct vp27smpx_state *state = i2c_get_clientdata(client);
int err;
err = i2c_detach_client(client);
if (err) {
return err;
}
kfree(state);
kfree(client);
return 0;
}
/* ----------------------------------------------------------------------- */
/* i2c implementation */
static struct i2c_driver i2c_driver = {
.driver = {
.name = "vp27smpx",
},
.id = I2C_DRIVERID_VP27SMPX,
.attach_adapter = vp27smpx_probe,
.detach_client = vp27smpx_detach,
.command = vp27smpx_command,
};
static int __init vp27smpx_init_module(void)
{
return i2c_add_driver(&i2c_driver);
}
static void __exit vp27smpx_cleanup_module(void)
{
i2c_del_driver(&i2c_driver);
}
module_init(vp27smpx_init_module);
module_exit(vp27smpx_cleanup_module);
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