Viewing file:  bt856.c (6.6 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
bt856 - BT856A Digital Video Encoder (Rockwell Part)
Copyright (C) 1999 Mike Bernson <mike@mlb.org>
Copyright (C) 1998 Dave Perks <dperks@ibm.net>
Modifications for LML33/DC10plus unified driver
Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
This code was modify/ported from the saa7111 driver written
by Dave Perks.
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/init.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/signal.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/sched.h>
#include <asm/segment.h>
#include <linux/types.h>
#include <linux/wrapper.h>
#include <linux/videodev.h>
#include <linux/version.h>
#include <asm/uaccess.h>
#include <linux/i2c-old.h>
#include <linux/video_encoder.h>
#define DEBUG(x) x /* Debug driver */
/* ----------------------------------------------------------------------- */
struct bt856 {
struct i2c_bus *bus;
int addr;
unsigned char reg[128];
int norm;
int enable;
int bright;
int contrast;
int hue;
int sat;
};
#define I2C_BT856 0x88
#define I2C_DELAY 10
/* ----------------------------------------------------------------------- */
static int bt856_write(struct bt856 *dev, unsigned char subaddr,
unsigned char data)
{
int ack;
LOCK_I2C_BUS(dev->bus);
i2c_start(dev->bus);
i2c_sendbyte(dev->bus, dev->addr, I2C_DELAY);
i2c_sendbyte(dev->bus, subaddr, I2C_DELAY);
ack = i2c_sendbyte(dev->bus, data, I2C_DELAY);
dev->reg[subaddr] = data;
i2c_stop(dev->bus);
UNLOCK_I2C_BUS(dev->bus);
return ack;
}
static int bt856_setbit(struct bt856 *dev, int subaddr, int bit, int data)
{
return bt856_write(dev, subaddr,(dev->reg[subaddr] & ~(1 << bit)) | (data ? (1 << bit) : 0));
}
/* ----------------------------------------------------------------------- */
static int bt856_attach(struct i2c_device *device)
{
struct bt856 *encoder;
/* This chip is not on the buz card but at the same address saa7185 */
//if (memcmp(device->bus->name, "buz", 3) == 0 || memcmp(device->bus->name, "zr36057", 6) == 0)
// return 1;
MOD_INC_USE_COUNT;
device->data = encoder = kmalloc(sizeof(struct bt856), GFP_KERNEL);
if (encoder == NULL) {
MOD_DEC_USE_COUNT;
return -ENOMEM;
}
memset(encoder, 0, sizeof(struct bt856));
strcpy(device->name, "bt856");
encoder->bus = device->bus;
encoder->addr = device->addr;
encoder->norm = VIDEO_MODE_NTSC;
encoder->enable = 1;
DEBUG(printk(KERN_INFO "%s-bt856: attach\n", encoder->bus->name));
bt856_write(encoder, 0xdc, 0x18);
bt856_write(encoder, 0xda, 0);
bt856_write(encoder, 0xde, 0);
bt856_setbit(encoder, 0xdc, 3, 1);
//bt856_setbit(encoder, 0xdc, 6, 0);
bt856_setbit(encoder, 0xdc, 4, 1);
switch (encoder->norm) {
case VIDEO_MODE_NTSC:
bt856_setbit(encoder, 0xdc, 2, 0);
break;
case VIDEO_MODE_PAL:
bt856_setbit(encoder, 0xdc, 2, 1);
break;
}
bt856_setbit(encoder, 0xdc, 1, 1);
bt856_setbit(encoder, 0xde, 4, 0);
bt856_setbit(encoder, 0xde, 3, 1);
return 0;
}
static int bt856_detach(struct i2c_device *device)
{
kfree(device->data);
MOD_DEC_USE_COUNT;
return 0;
}
static int bt856_command(struct i2c_device *device, unsigned int cmd,
void *arg)
{
struct bt856 *encoder = device->data;
switch (cmd) {
case ENCODER_GET_CAPABILITIES:
{
struct video_encoder_capability *cap = arg;
DEBUG(printk
(KERN_INFO "%s-bt856: get capabilities\n",
encoder->bus->name));
cap->flags
= VIDEO_ENCODER_PAL
| VIDEO_ENCODER_NTSC | VIDEO_ENCODER_CCIR;
cap->inputs = 2;
cap->outputs = 1;
}
break;
case ENCODER_SET_NORM:
{
int *iarg = arg;
DEBUG(printk(KERN_INFO "%s-bt856: set norm %d\n",
encoder->bus->name, *iarg));
switch (*iarg) {
case VIDEO_MODE_NTSC:
bt856_setbit(encoder, 0xdc, 2, 0);
break;
case VIDEO_MODE_PAL:
bt856_setbit(encoder, 0xdc, 2, 1);
bt856_setbit(encoder, 0xda, 0, 0);
//bt856_setbit(encoder, 0xda, 0, 1);
break;
default:
return -EINVAL;
}
encoder->norm = *iarg;
}
break;
case ENCODER_SET_INPUT:
{
int *iarg = arg;
DEBUG(printk(KERN_INFO "%s-bt856: set input %d\n",
encoder->bus->name, *iarg));
/* We only have video bus.
*iarg = 0: input is from bt819
*iarg = 1: input is from ZR36060 */
switch (*iarg) {
case 0:
bt856_setbit(encoder, 0xde, 4, 0);
bt856_setbit(encoder, 0xde, 3, 1);
bt856_setbit(encoder, 0xdc, 3, 1);
bt856_setbit(encoder, 0xdc, 6, 0);
break;
case 1:
bt856_setbit(encoder, 0xde, 4, 0);
bt856_setbit(encoder, 0xde, 3, 1);
bt856_setbit(encoder, 0xdc, 3, 1);
bt856_setbit(encoder, 0xdc, 6, 1);
break;
case 2: // Color bar
bt856_setbit(encoder, 0xdc, 3, 0);
bt856_setbit(encoder, 0xde, 4, 1);
break;
default:
return -EINVAL;
}
}
break;
case ENCODER_SET_OUTPUT:
{
int *iarg = arg;
DEBUG(printk(KERN_INFO "%s-bt856: set output %d\n",
encoder->bus->name, *iarg));
/* not much choice of outputs */
if (*iarg != 0) {
return -EINVAL;
}
}
break;
case ENCODER_ENABLE_OUTPUT:
{
int *iarg = arg;
encoder->enable = !!*iarg;
DEBUG(printk
(KERN_INFO "%s-bt856: enable output %d\n",
encoder->bus->name, encoder->enable));
}
break;
default:
return -EINVAL;
}
return 0;
}
/* ----------------------------------------------------------------------- */
static struct i2c_driver i2c_driver_bt856 = {
"bt856", /* name */
I2C_DRIVERID_VIDEOENCODER, /* ID */
I2C_BT856, I2C_BT856 + 1,
bt856_attach,
bt856_detach,
bt856_command
};
EXPORT_NO_SYMBOLS;
static int bt856_init(void)
{
return i2c_register_driver(&i2c_driver_bt856);
}
static void bt856_exit(void)
{
i2c_unregister_driver(&i2c_driver_bt856);
}
module_init(bt856_init);
module_exit(bt856_exit);
MODULE_LICENSE("GPL");
|