274 lines
7.0 KiB
C
274 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/slab.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/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-chip-ident.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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struct v4l2_subdev sd;
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unsigned char reg[BT856_NR_REG];
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v4l2_std_id norm;
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};
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static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct bt856, sd);
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}
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/* ----------------------------------------------------------------------- */
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static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
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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 bt856 *encoder, u8 reg, u8 bit, u8 value)
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{
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return bt856_write(encoder, 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 bt856 *encoder)
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{
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int i;
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v4l2_info(&encoder->sd, "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_init(struct v4l2_subdev *sd, u32 arg)
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{
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struct bt856 *encoder = to_bt856(sd);
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/* This is just for testing!!! */
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v4l2_dbg(1, debug, sd, "init\n");
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bt856_write(encoder, 0xdc, 0x18);
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bt856_write(encoder, 0xda, 0);
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bt856_write(encoder, 0xde, 0);
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bt856_setbit(encoder, 0xdc, 3, 1);
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/*bt856_setbit(encoder, 0xdc, 6, 0);*/
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bt856_setbit(encoder, 0xdc, 4, 1);
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if (encoder->norm & V4L2_STD_NTSC)
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bt856_setbit(encoder, 0xdc, 2, 0);
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else
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bt856_setbit(encoder, 0xdc, 2, 1);
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bt856_setbit(encoder, 0xdc, 1, 1);
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bt856_setbit(encoder, 0xde, 4, 0);
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bt856_setbit(encoder, 0xde, 3, 1);
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if (debug != 0)
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bt856_dump(encoder);
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return 0;
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}
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static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
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{
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struct bt856 *encoder = to_bt856(sd);
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v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
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if (std & V4L2_STD_NTSC) {
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bt856_setbit(encoder, 0xdc, 2, 0);
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} else if (std & V4L2_STD_PAL) {
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bt856_setbit(encoder, 0xdc, 2, 1);
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bt856_setbit(encoder, 0xda, 0, 0);
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/*bt856_setbit(encoder, 0xda, 0, 1);*/
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} else {
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return -EINVAL;
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}
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encoder->norm = std;
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if (debug != 0)
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bt856_dump(encoder);
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return 0;
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}
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static int bt856_s_routing(struct v4l2_subdev *sd,
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u32 input, u32 output, u32 config)
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{
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struct bt856 *encoder = to_bt856(sd);
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v4l2_dbg(1, debug, sd, "set input %d\n", input);
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/* We only have video bus.
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* input= 0: input is from bt819
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* input= 1: input is from ZR36060 */
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switch (input) {
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case 0:
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bt856_setbit(encoder, 0xde, 4, 0);
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bt856_setbit(encoder, 0xde, 3, 1);
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bt856_setbit(encoder, 0xdc, 3, 1);
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bt856_setbit(encoder, 0xdc, 6, 0);
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break;
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case 1:
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bt856_setbit(encoder, 0xde, 4, 0);
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bt856_setbit(encoder, 0xde, 3, 1);
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bt856_setbit(encoder, 0xdc, 3, 1);
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bt856_setbit(encoder, 0xdc, 6, 1);
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break;
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case 2: /* Color bar */
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bt856_setbit(encoder, 0xdc, 3, 0);
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bt856_setbit(encoder, 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(encoder);
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return 0;
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}
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static int bt856_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_BT856, 0);
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_core_ops bt856_core_ops = {
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.g_chip_ident = bt856_g_chip_ident,
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.init = bt856_init,
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};
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static const struct v4l2_subdev_video_ops bt856_video_ops = {
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.s_std_output = bt856_s_std_output,
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.s_routing = bt856_s_routing,
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};
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static const struct v4l2_subdev_ops bt856_ops = {
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.core = &bt856_core_ops,
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.video = &bt856_video_ops,
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};
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/* ----------------------------------------------------------------------- */
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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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struct v4l2_subdev *sd;
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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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sd = &encoder->sd;
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v4l2_i2c_subdev_init(sd, client, &bt856_ops);
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encoder->norm = V4L2_STD_NTSC;
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bt856_write(encoder, 0xdc, 0x18);
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bt856_write(encoder, 0xda, 0);
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bt856_write(encoder, 0xde, 0);
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bt856_setbit(encoder, 0xdc, 3, 1);
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/*bt856_setbit(encoder, 0xdc, 6, 0);*/
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bt856_setbit(encoder, 0xdc, 4, 1);
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if (encoder->norm & V4L2_STD_NTSC)
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bt856_setbit(encoder, 0xdc, 2, 0);
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else
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bt856_setbit(encoder, 0xdc, 2, 1);
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bt856_setbit(encoder, 0xdc, 1, 1);
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bt856_setbit(encoder, 0xde, 4, 0);
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bt856_setbit(encoder, 0xde, 3, 1);
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if (debug != 0)
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bt856_dump(encoder);
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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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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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kfree(to_bt856(sd));
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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 i2c_driver bt856_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "bt856",
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},
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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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module_i2c_driver(bt856_driver);
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