mirror of https://gitee.com/openkylin/linux.git
304 lines
7.0 KiB
C
304 lines
7.0 KiB
C
/*
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* bt856 - BT856A Digital Video Encoder (Rockwell Part)
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*
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* Copyright (C) 1999 Mike Bernson <mike@mlb.org>
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* Copyright (C) 1998 Dave Perks <dperks@ibm.net>
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*
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* Modifications for LML33/DC10plus unified driver
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* Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
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*
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* This code was modify/ported from the saa7111 driver written
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* by Dave Perks.
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*
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* Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
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* - moved over to linux>=2.4.x i2c protocol (9/9/2002)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <asm/uaccess.h>
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#include <linux/i2c.h>
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#include <linux/i2c-id.h>
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#include <linux/videodev.h>
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#include <linux/video_encoder.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-i2c-drv-legacy.h>
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MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
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MODULE_AUTHOR("Mike Bernson & Dave Perks");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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/* ----------------------------------------------------------------------- */
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#define BT856_REG_OFFSET 0xDA
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#define BT856_NR_REG 6
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struct bt856 {
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unsigned char reg[BT856_NR_REG];
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int norm;
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int enable;
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};
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/* ----------------------------------------------------------------------- */
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static inline int bt856_write(struct i2c_client *client, u8 reg, u8 value)
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{
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struct bt856 *encoder = i2c_get_clientdata(client);
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encoder->reg[reg - BT856_REG_OFFSET] = value;
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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static inline int bt856_setbit(struct i2c_client *client, u8 reg, u8 bit, u8 value)
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{
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struct bt856 *encoder = i2c_get_clientdata(client);
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return bt856_write(client, reg,
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(encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
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(value ? (1 << bit) : 0));
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}
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static void bt856_dump(struct i2c_client *client)
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{
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int i;
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struct bt856 *encoder = i2c_get_clientdata(client);
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v4l_info(client, "register dump:\n");
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for (i = 0; i < BT856_NR_REG; i += 2)
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printk(KERN_CONT " %02x", encoder->reg[i]);
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printk(KERN_CONT "\n");
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}
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/* ----------------------------------------------------------------------- */
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static int bt856_command(struct i2c_client *client, unsigned cmd, void *arg)
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{
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struct bt856 *encoder = i2c_get_clientdata(client);
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switch (cmd) {
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case 0:
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/* This is just for testing!!! */
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v4l_dbg(1, debug, client, "init\n");
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bt856_write(client, 0xdc, 0x18);
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bt856_write(client, 0xda, 0);
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bt856_write(client, 0xde, 0);
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bt856_setbit(client, 0xdc, 3, 1);
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//bt856_setbit(client, 0xdc, 6, 0);
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bt856_setbit(client, 0xdc, 4, 1);
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switch (encoder->norm) {
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case VIDEO_MODE_NTSC:
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bt856_setbit(client, 0xdc, 2, 0);
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break;
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case VIDEO_MODE_PAL:
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bt856_setbit(client, 0xdc, 2, 1);
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break;
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}
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bt856_setbit(client, 0xdc, 1, 1);
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bt856_setbit(client, 0xde, 4, 0);
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bt856_setbit(client, 0xde, 3, 1);
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if (debug != 0)
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bt856_dump(client);
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break;
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case ENCODER_GET_CAPABILITIES:
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{
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struct video_encoder_capability *cap = arg;
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v4l_dbg(1, debug, client, "get capabilities\n");
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cap->flags = VIDEO_ENCODER_PAL |
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VIDEO_ENCODER_NTSC |
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VIDEO_ENCODER_CCIR;
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cap->inputs = 2;
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cap->outputs = 1;
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break;
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}
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case ENCODER_SET_NORM:
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{
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int *iarg = arg;
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v4l_dbg(1, debug, client, "set norm %d\n", *iarg);
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switch (*iarg) {
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case VIDEO_MODE_NTSC:
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bt856_setbit(client, 0xdc, 2, 0);
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break;
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case VIDEO_MODE_PAL:
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bt856_setbit(client, 0xdc, 2, 1);
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bt856_setbit(client, 0xda, 0, 0);
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//bt856_setbit(client, 0xda, 0, 1);
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break;
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default:
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return -EINVAL;
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}
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encoder->norm = *iarg;
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if (debug != 0)
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bt856_dump(client);
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break;
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}
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case ENCODER_SET_INPUT:
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{
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int *iarg = arg;
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v4l_dbg(1, debug, client, "set input %d\n", *iarg);
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/* We only have video bus.
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* iarg = 0: input is from bt819
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* iarg = 1: input is from ZR36060 */
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switch (*iarg) {
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case 0:
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bt856_setbit(client, 0xde, 4, 0);
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bt856_setbit(client, 0xde, 3, 1);
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bt856_setbit(client, 0xdc, 3, 1);
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bt856_setbit(client, 0xdc, 6, 0);
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break;
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case 1:
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bt856_setbit(client, 0xde, 4, 0);
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bt856_setbit(client, 0xde, 3, 1);
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bt856_setbit(client, 0xdc, 3, 1);
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bt856_setbit(client, 0xdc, 6, 1);
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break;
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case 2: // Color bar
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bt856_setbit(client, 0xdc, 3, 0);
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bt856_setbit(client, 0xde, 4, 1);
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break;
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default:
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return -EINVAL;
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}
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if (debug != 0)
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bt856_dump(client);
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break;
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}
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case ENCODER_SET_OUTPUT:
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{
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int *iarg = arg;
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v4l_dbg(1, debug, client, "set output %d\n", *iarg);
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/* not much choice of outputs */
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if (*iarg != 0)
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return -EINVAL;
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break;
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}
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case ENCODER_ENABLE_OUTPUT:
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{
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int *iarg = arg;
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encoder->enable = !!*iarg;
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v4l_dbg(1, debug, client, "enable output %d\n", encoder->enable);
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break;
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}
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default:
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return -EINVAL;
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}
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };
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I2C_CLIENT_INSMOD;
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static int bt856_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct bt856 *encoder;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
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if (encoder == NULL)
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return -ENOMEM;
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encoder->norm = VIDEO_MODE_NTSC;
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encoder->enable = 1;
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i2c_set_clientdata(client, encoder);
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bt856_write(client, 0xdc, 0x18);
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bt856_write(client, 0xda, 0);
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bt856_write(client, 0xde, 0);
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bt856_setbit(client, 0xdc, 3, 1);
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//bt856_setbit(client, 0xdc, 6, 0);
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bt856_setbit(client, 0xdc, 4, 1);
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switch (encoder->norm) {
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case VIDEO_MODE_NTSC:
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bt856_setbit(client, 0xdc, 2, 0);
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break;
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case VIDEO_MODE_PAL:
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bt856_setbit(client, 0xdc, 2, 1);
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break;
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}
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bt856_setbit(client, 0xdc, 1, 1);
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bt856_setbit(client, 0xde, 4, 0);
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bt856_setbit(client, 0xde, 3, 1);
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if (debug != 0)
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bt856_dump(client);
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return 0;
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}
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static int bt856_remove(struct i2c_client *client)
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{
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kfree(i2c_get_clientdata(client));
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return 0;
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}
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static const struct i2c_device_id bt856_id[] = {
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{ "bt856", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, bt856_id);
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static struct v4l2_i2c_driver_data v4l2_i2c_data = {
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.name = "bt856",
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.driverid = I2C_DRIVERID_BT856,
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.command = bt856_command,
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.probe = bt856_probe,
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.remove = bt856_remove,
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.id_table = bt856_id,
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};
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