projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Modified in order to keep it compatible both with new and old videotext IOCTLs by | |
| 3 | * Michael Geng <linux@MichaelGeng.de> | |
| 4 | * | |
| 5 | * Cleaned up to use existing videodev interface and allow the idea | |
| 6 | * of multiple teletext decoders on the video4linux iface. Changed i2c | |
| 7 | * to cover addressing clashes on device busses. It's also rebuilt so | |
| 8 | * you can add arbitary multiple teletext devices to Linux video4linux | |
| 9 | * now (well 32 anyway). | |
| 10 | * | |
| 11 | * Alan Cox <Alan.Cox@linux.org> | |
| 12 | * | |
| 13 | * The original driver was heavily modified to match the i2c interface | |
| 14 | * It was truncated to use the WinTV boards, too. | |
| 15 | * | |
| 16 | * Copyright (c) 1998 Richard Guenther <richard.guenther@student.uni-tuebingen.de> | |
| 17 | * | |
| 18 | * $Id: saa5249.c,v 1.1 1998/03/30 22:23:23 alan Exp $ | |
| 19 | * | |
| 20 | * Derived From | |
| 21 | * | |
| 22 | * vtx.c: | |
| 23 | * This is a loadable character-device-driver for videotext-interfaces | |
| 24 | * (aka teletext). Please check the Makefile/README for a list of supported | |
| 25 | * interfaces. | |
| 26 | * | |
| 27 | * Copyright (c) 1994-97 Martin Buck <martin-2.buck@student.uni-ulm.de> | |
| 28 | * | |
| 29 | * | |
| 30 | * This program is free software; you can redistribute it and/or modify | |
| 31 | * it under the terms of the GNU General Public License as published by | |
| 32 | * the Free Software Foundation; either version 2 of the License, or | |
| 33 | * (at your option) any later version. | |
| 34 | * | |
| 35 | * This program is distributed in the hope that it will be useful, | |
| 36 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 37 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 38 | * GNU General Public License for more details. | |
| 39 | * | |
| 40 | * You should have received a copy of the GNU General Public License | |
| 41 | * along with this program; if not, write to the Free Software | |
| 42 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
| 43 | * USA. | |
| 44 | */ | |
| 45 | ||
| 46 | #include <linux/module.h> | |
| 47 | #include <linux/kernel.h> | |
| 48 | #include <linux/sched.h> | |
| 49 | #include <linux/mm.h> | |
| 50 | #include <linux/errno.h> | |
| 51 | #include <linux/delay.h> | |
| 52 | #include <linux/ioport.h> | |
| 53 | #include <linux/slab.h> | |
| 54 | #include <linux/init.h> | |
| 55 | #include <stdarg.h> | |
| 56 | #include <linux/i2c.h> | |
| 57 | #include <linux/videotext.h> | |
| 58 | #include <linux/videodev.h> | |
| 59 | ||
| 60 | #include <asm/io.h> | |
| 61 | #include <asm/uaccess.h> | |
| 62 | ||
| 63 | #define VTX_VER_MAJ 1 | |
| 64 | #define VTX_VER_MIN 8 | |
| 65 | ||
| 66 | ||
| 67 | ||
| 68 | #define NUM_DAUS 4 | |
| 69 | #define NUM_BUFS 8 | |
| 70 | #define IF_NAME "SAA5249" | |
| 71 | ||
| 72 | static const int disp_modes[8][3] = | |
| 73 | { | |
| 74 | { 0x46, 0x03, 0x03 }, /* DISPOFF */ | |
| 75 | { 0x46, 0xcc, 0xcc }, /* DISPNORM */ | |
| 76 | { 0x44, 0x0f, 0x0f }, /* DISPTRANS */ | |
| 77 | { 0x46, 0xcc, 0x46 }, /* DISPINS */ | |
| 78 | { 0x44, 0x03, 0x03 }, /* DISPOFF, interlaced */ | |
| 79 | { 0x44, 0xcc, 0xcc }, /* DISPNORM, interlaced */ | |
| 80 | { 0x44, 0x0f, 0x0f }, /* DISPTRANS, interlaced */ | |
| 81 | { 0x44, 0xcc, 0x46 } /* DISPINS, interlaced */ | |
| 82 | }; | |
| 83 | ||
| 84 | ||
| 85 | ||
| 86 | #define PAGE_WAIT (300*HZ/1000) /* Time between requesting page and */ | |
| 87 | /* checking status bits */ | |
| 88 | #define PGBUF_EXPIRE (15*HZ) /* Time to wait before retransmitting */ | |
| 89 | /* page regardless of infobits */ | |
| 90 | typedef struct { | |
| 91 | u8 pgbuf[VTX_VIRTUALSIZE]; /* Page-buffer */ | |
| 92 | u8 laststat[10]; /* Last value of infobits for DAU */ | |
| 93 | u8 sregs[7]; /* Page-request registers */ | |
| 94 | unsigned long expire; /* Time when page will be expired */ | |
| 95 | unsigned clrfound : 1; /* VTXIOCCLRFOUND has been called */ | |
| 96 | unsigned stopped : 1; /* VTXIOCSTOPDAU has been called */ | |
| 97 | } vdau_t; | |
| 98 | ||
| 99 | struct saa5249_device | |
| 100 | { | |
| 101 | vdau_t vdau[NUM_DAUS]; /* Data for virtual DAUs (the 5249 only has one */ | |
| 102 | /* real DAU, so we have to simulate some more) */ | |
| 103 | int vtx_use_count; | |
| 104 | int is_searching[NUM_DAUS]; | |
| 105 | int disp_mode; | |
| 106 | int virtual_mode; | |
| 107 | struct i2c_client *client; | |
| 108 | struct semaphore lock; | |
| 109 | }; | |
| 110 | ||
| 111 |