/* * Cleaned up to use existing videodev interface and allow the idea * of multiple teletext decoders on the video4linux iface. Changed i2c * to cover addressing clashes on device busses. It's also rebuilt so * you can add arbitary multiple teletext devices to Linux video4linux * now (well 32 anyway). * * Alan Cox * * The original driver was heavily modified to match the i2c interface * It was truncated to use the WinTV boards, too. * * Copyright (c) 1998 Richard Guenther * * $Id: saa5249.c,v 1.1 1998/03/30 22:23:23 alan Exp $ * * Derived From * * vtx.c: * This is a loadable character-device-driver for videotext-interfaces * (aka teletext). Please check the Makefile/README for a list of supported * interfaces. * * Copyright (c) 1994-97 Martin Buck * * * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define VTX_VER_MAJ 1 #define VTX_VER_MIN 7 #define NUM_DAUS 4 #define NUM_BUFS 8 #define IF_NAME "SAA5249" static const int disp_modes[8][3] = { { 0x46, 0x03, 0x03 }, /* DISPOFF */ { 0x46, 0xcc, 0xcc }, /* DISPNORM */ { 0x44, 0x0f, 0x0f }, /* DISPTRANS */ { 0x46, 0xcc, 0x46 }, /* DISPINS */ { 0x44, 0x03, 0x03 }, /* DISPOFF, interlaced */ { 0x44, 0xcc, 0xcc }, /* DISPNORM, interlaced */ { 0x44, 0x0f, 0x0f }, /* DISPTRANS, interlaced */ { 0x44, 0xcc, 0x46 } /* DISPINS, interlaced */ }; #define PAGE_WAIT (300*HZ/1000) /* Time between requesting page and */ /* checking status bits */ #define PGBUF_EXPIRE (15*HZ) /* Time to wait before retransmitting */ /* page regardless of infobits */ typedef struct { u8 pgbuf[VTX_VIRTUALSIZE]; /* Page-buffer */ u8 laststat[10]; /* Last value of infobits for DAU */ u8 sregs[7]; /* Page-request registers */ unsigned long expire; /* Time when page will be expired */ unsigned clrfound : 1; /* VTXIOCCLRFOUND has been called */ unsigned stopped : 1; /* VTXIOCSTOPDAU has been called */ } vdau_t; struct saa5249_device { vdau_t vdau[NUM_DAUS]; /* Data for virtual DAUs (the 5249 only has one */ /* real DAU, so we have to simulate some more) */ int vtx_use_count; int is_searching[NUM_DAUS]; int disp_mode; int virtual_mode; struct i2c_bus *bus; }; #define CCTWR 34 /* I²C write/read-address of vtx-chip */ #define CCTRD 35 #define NOACK_REPEAT 10 /* Retry access this many times on failure */ #define CLEAR_DELAY (HZ/20) /* Time required to clear a page */ #define I2C_TIMEOUT (3*HZ) /* open/close/SDA-check timeout */ #define READY_TIMEOUT (30*HZ/1000) /* Time to wait for ready signal of I²C-bus interface */ #define INIT_DELAY 500 /* Time in usec to wait at initialization of CEA interface */ #define START_DELAY 10 /* Time in usec to wait before starting write-cycle (CEA) */ #define VTX_DEV_MINOR 0 /* General defines and debugging support */ #ifndef FALSE #define FALSE 0 #define TRUE 1 #endif #ifndef MIN #define MIN(a, b) ((a) < (b) ? (a) : (b)) #define MAX(a, b) ((a) > (b) ? (a) : (b)) #endif #define RESCHED \ do { \ if (current->need_resched) \ schedule(); \ } while (0) static struct video_device saa_template; /* Declared near bottom */ /* * We do most of the hard work when we become a device on the i2c. */ static int saa5249_attach(struct i2c_device *device) { int pgbuf; int err; struct video_device *vd; struct saa5249_device *t; /* Only attach these chips to the BT848 bus for now */ if(device->bus->id!=I2C_BUSID_BT848) return -EINVAL; strcpy(device->name, IF_NAME); /* * Now create a video4linux device */ vd=(struct video_device *)kmalloc(sizeof(struct video_device), GFP_KERNEL); if(vd==NULL) return -ENOMEM; memcpy(vd, &saa_template, sizeof(*vd)); /* * Attach an saa5249 device */ t=(struct saa5249_device *)kmalloc(sizeof(struct saa5249_device), GFP_KERNEL); if(t==NULL) { kfree(vd); return -ENOMEM; } memset(t, 0, sizeof(*t)); for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) { memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf)); memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs)); memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat)); t->vdau[pgbuf].expire = 0; t->vdau[pgbuf].clrfound = TRUE; t->vdau[pgbuf].stopped = TRUE; t->is_searching[pgbuf] = FALSE; } vd->priv=t; device->data=vd; /* * Register it */ if((err=video_register_device(vd, VFL_TYPE_VTX))<0) { kfree(t); kfree(vd); return err; } t->bus = device->bus; return 0; } static int saa5249_detach(struct i2c_device *device) { struct video_device *vd=device->data; video_unregister_device(vd); kfree(vd->priv); kfree(vd); return 0; } static int saa5249_command(struct i2c_device *device, unsigned int cmd, void *arg) { return -EINVAL; } /* new I2C driver support */ static struct i2c_driver i2c_driver_videotext = { IF_NAME, /* name */ I2C_DRIVERID_VIDEOTEXT, /* in i2c.h */ 34, 35, /* Addr range */ saa5249_attach, saa5249_detach, saa5249_command }; /* * Wait the given number of jiffies (10ms). This calls the scheduler, so the actual * delay may be longer. */ static void jdelay(unsigned long delay) { sigset_t oldblocked = current->blocked; spin_lock_irq(¤t->sigmask_lock); sigfillset(¤t->blocked); recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); current->state = TASK_INTERRUPTIBLE; schedule_timeout(delay); spin_lock_irq(¤t->sigmask_lock); current->blocked = oldblocked; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); } /* Send arbitrary number of bytes to I²C-bus. Start & stop handshaking is done by this routine. * adr should be address of I²C-device, varargs-list of values to send must be terminated by -1 * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise */ static int i2c_senddata(struct saa5249_device *t, int adr, ...) { int val, loop; va_list argp; for (loop = 0; loop <= NOACK_REPEAT; loop++) { i2c_start(t->bus); if (i2c_sendbyte(t->bus, adr, 0) != 0) goto loopend; va_start(argp, adr); while ((val = va_arg(argp, int)) != -1) { if (val < 0 || val > 255) { printk(KERN_ERR "vtx: internal error in i2c_senddata\n"); break; } if (i2c_sendbyte(t->bus, val, 0) != 0) goto loopend; } va_end(argp); i2c_stop(t->bus); return 0; loopend: i2c_stop(t->bus); } va_end(argp); return -1; } /* Send count number of bytes from buffer buf to I²C-device adr. Start & stop handshaking is * done by this routine. If uaccess is TRUE, data is read from user-space with get_user. * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise */ static int i2c_sendbuf(struct saa5249_device *t, int adr, int reg, int count, u8 *buf, int uaccess) { int pos, loop; u8 val; for (loop = 0; loop <= NOACK_REPEAT; loop++) { i2c_start(t->bus); if (i2c_sendbyte(t->bus, adr, 0) != 0 || i2c_sendbyte(t->bus, reg, 0) != 0) goto loopend; for (pos = 0; pos < count; pos++) { /* FIXME: FAULT WITH CLI/SPINLOCK ?? */ if (uaccess) get_user(val, buf + pos); else val = buf[pos]; if (i2c_sendbyte(t->bus, val, 0) != 0) goto loopend; RESCHED; } i2c_stop(t->bus); return 0; loopend: i2c_stop(t->bus); } return -1; } /* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop * handshaking is done by this routine, ack will be sent after the last byte to inhibit further * sending of data. If uaccess is TRUE, data is written to user-space with put_user. * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise */ static int i2c_getdata(struct saa5249_device *t, int adr, int count, u8 *buf, int uaccess) { int pos, loop, val; for (loop = 0; loop <= NOACK_REPEAT; loop++) { i2c_start(t->bus); if (i2c_sendbyte(t->bus, adr, 1) != 0) goto loopend; for (pos = 0; pos < count; pos++) { val = i2c_readbyte(t->bus, (pos==count-1) ? 1 : 0); if (uaccess) put_user(val, buf + pos); else buf[pos] = val; RESCHED; } i2c_stop(t->bus); return 0; loopend: i2c_stop(t->bus); } return -1; } /* * Standard character-device-driver functions */ static int saa5249_ioctl(struct video_device *vd, unsigned int cmd, void *arg) { struct saa5249_device *t=vd->priv; static int virtual_mode = FALSE; switch(cmd) { case VTXIOCGETINFO: { vtx_info_t info; info.version_major = VTX_VER_MAJ; info.version_minor = VTX_VER_MIN; info.numpages = NUM_DAUS; /*info.cct_type = CCT_TYPE;*/ if(copy_to_user((void*)arg, &info, sizeof(vtx_info_t))) return -EFAULT; return 0; } case VTXIOCCLRPAGE: { vtx_pagereq_t req; if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t))) return -EFAULT; if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS) return -EINVAL; memset(t->vdau[req.pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf)); t->vdau[req.pgbuf].clrfound = TRUE; return 0; } case VTXIOCCLRFOUND: { vtx_pagereq_t req; if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t))) return -EFAULT; if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS) return -EINVAL; t->vdau[req.pgbuf].clrfound = TRUE; return 0; } case VTXIOCPAGEREQ: { vtx_pagereq_t req; if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t))) return -EFAULT; if (!(req.pagemask & PGMASK_PAGE)) req.page = 0; if (!(req.pagemask & PGMASK_HOUR)) req.hour = 0; if (!(req.pagemask & PGMASK_MINUTE)) req.minute = 0; if (req.page < 0 || req.page > 0x8ff) /* 7FF ?? */ return -EINVAL; req.page &= 0x7ff; if (req.hour < 0 || req.hour > 0x3f || req.minute < 0 || req.minute > 0x7f || req.pagemask < 0 || req.pagemask >= PGMASK_MAX || req.pgbuf < 0 || req.pgbuf >= NUM_DAUS) return -EINVAL; t->vdau[req.pgbuf].sregs[0] = (req.pagemask & PG_HUND ? 0x10 : 0) | (req.page / 0x100); t->vdau[req.pgbuf].sregs[1] = (req.pagemask & PG_TEN ? 0x10 : 0) | ((req.page / 0x10) & 0xf); t->vdau[req.pgbuf].sregs[2] = (req.pagemask & PG_UNIT ? 0x10 : 0) | (req.page & 0xf); t->vdau[req.pgbuf].sregs[3] = (req.pagemask & HR_TEN ? 0x10 : 0) | (req.hour / 0x10); t->vdau[req.pgbuf].sregs[4] = (req.pagemask & HR_UNIT ? 0x10 : 0) | (req.hour & 0xf); t->vdau[req.pgbuf].sregs[5] = (req.pagemask & MIN_TEN ? 0x10 : 0) | (req.minute / 0x10); t->vdau[req.pgbuf].sregs[6] = (req.pagemask & MIN_UNIT ? 0x10 : 0) | (req.minute & 0xf); t->vdau[req.pgbuf].stopped = FALSE; t->vdau[req.pgbuf].clrfound = TRUE; t->is_searching[req.pgbuf] = TRUE; return 0; } case VTXIOCGETSTAT: { vtx_pagereq_t req; u8 infobits[10]; vtx_pageinfo_t info; int a; if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t))) return -EFAULT; if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS) return -EINVAL; if (!t->vdau[req.pgbuf].stopped) { if (i2c_senddata(t, CCTWR, 2, 0, -1) || i2c_sendbuf(t, CCTWR, 3, sizeof(t->vdau[0].sregs), t->vdau[req.pgbuf].sregs, FALSE) || i2c_senddata(t, CCTWR, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) || i2c_senddata(t, CCTWR, 2, 0, t->vdau[req.pgbuf].sregs[0] | 8, -1) || i2c_senddata(t, CCTWR, 8, 0, 25, 0, -1)) return -EIO; jdelay(PAGE_WAIT); if (i2c_getdata(t, CCTRD, 10, infobits, FALSE)) return -EIO; if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) && /* check FOUND-bit */ (memcmp(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits)) || time_after_eq(jiffies, t->vdau[req.pgbuf].expire))) { /* check if new page arrived */ if (i2c_senddata(t, CCTWR, 8, 0, 0, 0, -1) || i2c_getdata(t, CCTRD, VTX_PAGESIZE, t->vdau[req.pgbuf].pgbuf, FALSE)) return -EIO; t->vdau[req.pgbuf].expire = jiffies + PGBUF_EXPIRE; memset(t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE); if (t->virtual_mode) { /* Packet X/24 */ if (i2c_senddata(t, CCTWR, 8, 0, 0x20, 0, -1) || i2c_getdata(t, CCTRD, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40, FALSE)) return -EIO; /* Packet X/27/0 */ if (i2c_senddata(t, CCTWR, 8, 0, 0x21, 0, -1) || i2c_getdata(t, CCTRD, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40, FALSE)) return -EIO; /* Packet 8/30/0...8/30/15 * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30, * so we should undo this here. */ if (i2c_senddata(t, CCTWR, 8, 0, 0x22, 0, -1) || i2c_getdata(t, CCTRD, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40, FALSE)) return -EIO; } t->vdau[req.pgbuf].clrfound = FALSE; memcpy(t->vdau[req.pgbuf].laststat, infobits, sizeof(infobits)); } else { memcpy(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits)); } } else { memcpy(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits)); } info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f); if (info.pagenum < 0x100) info.pagenum += 0x800; info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f); info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f); info.charset = ((infobits[7] >> 1) & 7); info.delete = !!(infobits[3] & 8); info.headline = !!(infobits[5] & 4); info.subtitle = !!(infobits[5] & 8); info.supp_header = !!(infobits[6] & 1); info.update = !!(infobits[6] & 2); info.inter_seq = !!(infobits[6] & 4); info.dis_disp = !!(infobits[6] & 8); info.serial = !!(infobits[7] & 1); info.notfound = !!(infobits[8] & 0x10); info.pblf = !!(infobits[9] & 0x20); info.hamming = 0; for (a = 0; a <= 7; a++) { if (infobits[a] & 0xf0) { info.hamming = 1; break; } } if (t->vdau[req.pgbuf].clrfound) info.notfound = 1; if(copy_to_user(req.buffer, &info, sizeof(vtx_pageinfo_t))) return -EFAULT; if (!info.hamming && !info.notfound) { t->is_searching[req.pgbuf] = FALSE; } return 0; } case VTXIOCGETPAGE: { vtx_pagereq_t req; int start, end; if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t))) return -EFAULT; if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS || req.start < 0 || req.start > req.end || req.end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE)) return -EINVAL; if(copy_to_user(req.buffer, &t->vdau[req.pgbuf].pgbuf[req.start], req.end - req.start + 1)) return -EFAULT; /* * Always read the time directly from SAA5249 */ if (req.start <= 39 && req.end >= 32) { start = MAX(req.start, 32); end = MIN(req.end, 39); if (i2c_senddata(t, CCTWR, 8, 0, 0, start, -1) || i2c_getdata(t, CCTRD, end - start + 1, req.buffer + start - req.start, TRUE)) return -EIO; } /* Insert the current header if DAU is still searching for a page */ if (req.start <= 31 && req.end >= 7 && t->is_searching[req.pgbuf]) { start = MAX(req.start, 7); end = MIN(req.end, 31); if (i2c_senddata(t, CCTWR, 8, 0, 0, start, -1) || i2c_getdata(t, CCTRD, end - start + 1, req.buffer + start - req.start, TRUE)) return -EIO; } return 0; } case VTXIOCSTOPDAU: { vtx_pagereq_t req; if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t))) return -EFAULT; if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS) return -EINVAL; t->vdau[req.pgbuf].stopped = TRUE; t->is_searching[req.pgbuf] = FALSE; return 0; } case VTXIOCPUTPAGE: case VTXIOCSETDISP: case VTXIOCPUTSTAT: return 0; case VTXIOCCLRCACHE: { if (i2c_senddata(t ,CCTWR, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, CCTWR, 11, ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1)) return -EIO; if (i2c_senddata(t, CCTWR, 3, 0x20, -1)) return -EIO; jdelay(10 * CLEAR_DELAY); /* I have no idea how long we have to wait here */ return 0; } case VTXIOCSETVIRT: { /* The SAA5249 has virtual-row reception turned on always */ t->virtual_mode = (int)arg; return 0; } } return -EINVAL; } static int saa5249_open(struct video_device *vd, int nb) { struct saa5249_device *t=vd->priv; int pgbuf; if (t->bus==NULL) return -ENODEV; if (i2c_senddata(t, CCTWR, 0, 0, -1) || /* Select R11 */ /* Turn off parity checks (we do this ourselves) */ i2c_senddata(t, CCTWR, 1, disp_modes[t->disp_mode][0], 0, -1) || /* Display TV-picture, no virtual rows */ i2c_senddata(t, CCTWR, 4, NUM_DAUS, disp_modes[t->disp_mode][1], disp_modes[t->disp_mode][2], 7, -1)) /* Set display to page 4 */ { return -EIO; } for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) { memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf)); memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs)); memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat)); t->vdau[pgbuf].expire = 0; t->vdau[pgbuf].clrfound = TRUE; t->vdau[pgbuf].stopped = TRUE; t->is_searching[pgbuf] = FALSE; } t->virtual_mode=FALSE; MOD_INC_USE_COUNT; return 0; } static void saa5249_release(struct video_device *vd) { struct saa5249_device *t=vd->priv; i2c_senddata(t, CCTWR, 1, 0x20, -1); /* Turn off CCT */ i2c_senddata(t, CCTWR, 5, 3, 3, -1); /* Turn off TV-display */ MOD_DEC_USE_COUNT; return; } static long saa5249_write(struct video_device *v, const char *buf, unsigned long l, int nb) { return -EINVAL; } static long saa5249_read(struct video_device *v, char *buf, unsigned long l, int nb) { return -EINVAL; } int init_saa_5249(struct video_init *v) { printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n", VTX_VER_MAJ, VTX_VER_MIN); i2c_register_driver(&i2c_driver_videotext); return 0; } static struct video_device saa_template= { IF_NAME, VID_TYPE_TELETEXT, /*| VID_TYPE_TUNER ?? */ VID_HARDWARE_SAA5249, saa5249_open, saa5249_release, saa5249_read, saa5249_write, NULL, /* poll */ saa5249_ioctl, NULL, NULL, NULL, 0, 0 }; #ifdef MODULE /* * Routines for loadable modules */ int init_module(void) { init_saa_5249(NULL); return 0; } void cleanup_module(void) { i2c_unregister_driver(&i2c_driver_videotext); } #endif