/* * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from * Philips. * * Only capturing of Teletext pages is tested. The videotext chips also have a * TV output but my hardware doesn't use it. For this reason this driver does * not support changing any TV display settings. * * Copyright (C) 2004 Michael Geng <linux@MichaelGeng.de> * * Derived from * * saa5249 driver * Copyright (C) 1998 Richard Guenther * <richard.guenther@student.uni-tuebingen.de> * * with changes by * Alan Cox <Alan.Cox@linux.org> * * and * * vtx.c * Copyright (C) 1994-97 Martin Buck <martin-2.buck@student.uni-ulm.de> * * 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 <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/videotext.h> #include <linux/videodev.h> #include <media/v4l2-common.h> #include <linux/mutex.h> #include "saa5246a.h" MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>"); MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver"); MODULE_LICENSE("GPL"); struct saa5246a_device { u8 pgbuf[NUM_DAUS][VTX_VIRTUALSIZE]; int is_searching[NUM_DAUS]; struct i2c_client *client; struct mutex lock; }; static struct video_device saa_template; /* Declared near bottom */ /* Addresses to scan */ static unsigned short normal_i2c[] = { I2C_ADDRESS, I2C_CLIENT_END }; I2C_CLIENT_INSMOD; static struct i2c_client client_template; static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind) { int pgbuf; int err; struct i2c_client *client; struct video_device *vd; struct saa5246a_device *t; printk(KERN_INFO "saa5246a: teletext chip found.\n"); client=kmalloc(sizeof(*client), GFP_KERNEL); if(client==NULL) return -ENOMEM; client_template.adapter = adap; client_template.addr = addr; memcpy(client, &client_template, sizeof(*client)); t = kzalloc(sizeof(*t), GFP_KERNEL); if(t==NULL) { kfree(client); return -ENOMEM; } strlcpy(client->name, IF_NAME, I2C_NAME_SIZE); mutex_init(&t->lock); /* * Now create a video4linux device */ vd = video_device_alloc(); if(vd==NULL) { kfree(t); kfree(client); return -ENOMEM; } i2c_set_clientdata(client, vd); memcpy(vd, &saa_template, sizeof(*vd)); for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) { memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0])); t->is_searching[pgbuf] = FALSE; } vd->priv=t; /* * Register it */ if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0) { kfree(t); kfree(client); video_device_release(vd); return err; } t->client = client; i2c_attach_client(client); return 0; } /* * We do most of the hard work when we become a device on the i2c. */ static int saa5246a_probe(struct i2c_adapter *adap) { if (adap->class & I2C_CLASS_TV_ANALOG) return i2c_probe(adap, &addr_data, saa5246a_attach); return 0; } static int saa5246a_detach(struct i2c_client *client) { struct video_device *vd = i2c_get_clientdata(client); i2c_detach_client(client); video_unregister_device(vd); kfree(vd->priv); kfree(client); return 0; } /* * I2C interfaces */ static struct i2c_driver i2c_driver_videotext = { .driver = { .name = IF_NAME, /* name */ }, .id = I2C_DRIVERID_SAA5249, /* in i2c.h */ .attach_adapter = saa5246a_probe, .detach_client = saa5246a_detach, }; static struct i2c_client client_template = { .driver = &i2c_driver_videotext, .name = "(unset)", }; static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data) { char buf[64]; buf[0] = reg; memcpy(buf+1, data, count); if(i2c_master_send(t->client, buf, count+1)==count+1) return 0; return -1; } static int i2c_senddata(struct saa5246a_device *t, ...) { unsigned char buf[64]; int v; int ct=0; va_list argp; va_start(argp,t); while((v=va_arg(argp,int))!=-1) buf[ct++]=v; return i2c_sendbuf(t, buf[0], ct-1, buf+1); } /* Get count number of bytes from I�C-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 I�C-device didn't send * acknowledge, 0 otherwise */ static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf) { if(i2c_master_recv(t->client, buf, count)!=count) return -1; return 0; } /* When a page is found then the not FOUND bit in one of the status registers * of the SAA5264A chip is cleared. Unfortunately this bit is not set * automatically when a new page is requested. Instead this function must be * called after a page has been requested. * * Return value: 0 if successful */ static int saa5246a_clear_found_bit(struct saa5246a_device *t, unsigned char dau_no) { unsigned char row_25_column_8; if (i2c_senddata(t, SAA5246A_REGISTER_R8, dau_no | R8_DO_NOT_CLEAR_MEMORY, R9_CURSER_ROW_25, R10_CURSER_COLUMN_8, COMMAND_END) || i2c_getdata(t, 1, &row_25_column_8)) { return -EIO; } row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND; if (i2c_senddata(t, SAA5246A_REGISTER_R8, dau_no | R8_DO_NOT_CLEAR_MEMORY, R9_CURSER_ROW_25, R10_CURSER_COLUMN_8, row_25_column_8, COMMAND_END)) { return -EIO; } return 0; } /* Requests one videotext page as described in req. The fields of req are * checked and an error is returned if something is invalid. * * Return value: 0 if successful */ static int saa5246a_request_page(struct saa5246a_device *t, vtx_pagereq_t *req) { if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX) return -EINVAL; if (req->pagemask & PGMASK_PAGE) if (req->page < 0 || req->page > PAGE_MAX) return -EINVAL; if (req->pagemask & PGMASK_HOUR) if (req->hour < 0 || req->hour > HOUR_MAX) return -EINVAL; if (req->pagemask & PGMASK_MINUTE) if (req->minute < 0 || req->minute > MINUTE_MAX) return -EINVAL; if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) return -EINVAL; if (i2c_senddata(t, SAA5246A_REGISTER_R2, R2_IN_R3_SELECT_PAGE_HUNDREDS | req->pgbuf << 4 | R2_BANK_0 | R2_HAMMING_CHECK_OFF, HUNDREDS_OF_PAGE(req->page) | R3_HOLD_PAGE | (req->pagemask & PG_HUND ? R3_PAGE_HUNDREDS_DO_CARE : R3_PAGE_HUNDREDS_DO_NOT_CARE), TENS_OF_PAGE(req->page) | (req->pagemask & PG_TEN ? R3_PAGE_TENS_DO_CARE : R3_PAGE_TENS_DO_NOT_CARE), UNITS_OF_PAGE(req->page) | (req->pagemask & PG_UNIT ? R3_PAGE_UNITS_DO_CARE : R3_PAGE_UNITS_DO_NOT_CARE), TENS_OF_HOUR(req->hour) | (req->pagemask & HR_TEN ? R3_HOURS_TENS_DO_CARE : R3_HOURS_TENS_DO_NOT_CARE), UNITS_OF_HOUR(req->hour) | (req->pagemask & HR_UNIT ? R3_HOURS_UNITS_DO_CARE : R3_HOURS_UNITS_DO_NOT_CARE), TENS_OF_MINUTE(req->minute) | (req->pagemask & MIN_TEN ? R3_MINUTES_TENS_DO_CARE : R3_MINUTES_TENS_DO_NOT_CARE), UNITS_OF_MINUTE(req->minute) | (req->pagemask & MIN_UNIT ? R3_MINUTES_UNITS_DO_CARE : R3_MINUTES_UNITS_DO_NOT_CARE), COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2, R2_IN_R3_SELECT_PAGE_HUNDREDS | req->pgbuf << 4 | R2_BANK_0 | R2_HAMMING_CHECK_OFF, HUNDREDS_OF_PAGE(req->page) | R3_UPDATE_PAGE | (req->pagemask & PG_HUND ? R3_PAGE_HUNDREDS_DO_CARE : R3_PAGE_HUNDREDS_DO_NOT_CARE), COMMAND_END)) { return -EIO; } t->is_searching[req->pgbuf] = TRUE; return 0; } /* This routine decodes the page number from the infobits contained in line 25. * * Parameters: * infobits: must be bits 0 to 9 of column 25 * * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123 */ static inline int saa5246a_extract_pagenum_from_infobits( unsigned char infobits[10]) { int page_hundreds, page_tens, page_units; page_units = infobits[0] & ROW25_COLUMN0_PAGE_UNITS; page_tens = infobits[1] & ROW25_COLUMN1_PAGE_TENS; page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS; /* page 0x.. means page 8.. */ if (page_hundreds == 0) page_hundreds = 8; return((page_hundreds << 8) | (page_tens << 4) | page_units); } /* Decodes the hour from the infobits contained in line 25. * * Parameters: * infobits: must be bits 0 to 9 of column 25 * * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12 */ static inline int saa5246a_extract_hour_from_infobits( unsigned char infobits[10]) { int hour_tens, hour_units; hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS; hour_tens = infobits[5] & ROW25_COLUMN5_HOUR_TENS; return((hour_tens << 4) | hour_units); } /* Decodes the minutes from the infobits contained in line 25. * * Parameters: * infobits: must be bits 0 to 9 of column 25 * * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10 */ static inline int saa5246a_extract_minutes_from_infobits( unsigned char infobits[10]) { int minutes_tens, minutes_units; minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS; minutes_tens = infobits[3] & ROW25_COLUMN3_MINUTES_TENS; return((minutes_tens << 4) | minutes_units); } /* Reads the status bits contained in the first 10 columns of the first line * and extracts the information into info. * * Return value: 0 if successful */ static inline int saa5246a_get_status(struct saa5246a_device *t, vtx_pageinfo_t *info, unsigned char dau_no) { unsigned char infobits[10]; int column; if (dau_no >= NUM_DAUS) return -EINVAL; if (i2c_senddata(t, SAA5246A_REGISTER_R8, dau_no | R8_DO_NOT_CLEAR_MEMORY, R9_CURSER_ROW_25, R10_CURSER_COLUMN_0, COMMAND_END) || i2c_getdata(t, 10, infobits)) { return -EIO; } info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits); info->hour = saa5246a_extract_hour_from_infobits(infobits); info->minute = saa5246a_extract_minutes_from_infobits(infobits); info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1); info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE); info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE); info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE); info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER); info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE); info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE); info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY); info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE); info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND); info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR); info->hamming = 0; for (column = 0; column <= 7; column++) { if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) { info->hamming = 1; break; } } if (!info->hamming && !info->notfound) t->is_searching[dau_no] = FALSE; return 0; } /* Reads 1 videotext page buffer of the SAA5246A. * * req is used both as input and as output. It contains information which part * must be read. The videotext page is copied into req->buffer. * * Return value: 0 if successful */ static inline int saa5246a_get_page(struct saa5246a_device *t, vtx_pagereq_t *req) { int start, end, size; char *buf; int err; if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE) return -EINVAL; buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL); if (!buf) return -ENOMEM; /* Read "normal" part of page */ err = -EIO; end = min(req->end, VTX_PAGESIZE - 1); if (i2c_senddata(t, SAA5246A_REGISTER_R8, req->pgbuf | R8_DO_NOT_CLEAR_MEMORY, ROW(req->start), COLUMN(req->start), COMMAND_END)) goto out; if (i2c_getdata(t, end - req->start + 1, buf)) goto out; err = -EFAULT; if (copy_to_user(req->buffer, buf, end - req->start + 1)) goto out; /* Always get the time from buffer 4, since this stupid SAA5246A only * updates the currently displayed buffer... */ if (REQ_CONTAINS_TIME(req)) { start = max(req->start, POS_TIME_START); end = min(req->end, POS_TIME_END); size = end - start + 1; err = -EINVAL; if (size < 0) goto out; err = -EIO; if (i2c_senddata(t, SAA5246A_REGISTER_R8, R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY, R9_CURSER_ROW_0, start, COMMAND_END)) goto out; if (i2c_getdata(t, size, buf)) goto out; err = -EFAULT; if (copy_to_user(req->buffer + start - req->start, buf, size)) goto out; } /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */ if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) { start = max(req->start, POS_HEADER_START); end = min(req->end, POS_HEADER_END); size = end - start + 1; err = -EINVAL; if (size < 0) goto out; err = -EIO; if (i2c_senddata(t, SAA5246A_REGISTER_R8, R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY, R9_CURSER_ROW_0, start, COMMAND_END)) goto out; if (i2c_getdata(t, end - start + 1, buf)) goto out; err = -EFAULT; if (copy_to_user(req->buffer + start - req->start, buf, size)) goto out; } err = 0; out: kfree(buf); return err; } /* Stops the acquisition circuit given in dau_no. The page buffer associated * with this acquisition circuit will no more be updated. The other daus are * not affected. * * Return value: 0 if successful */ static inline int saa5246a_stop_dau(struct saa5246a_device *t, unsigned char dau_no) { if (dau_no >= NUM_DAUS) return -EINVAL; if (i2c_senddata(t, SAA5246A_REGISTER_R2, R2_IN_R3_SELECT_PAGE_HUNDREDS | dau_no << 4 | R2_BANK_0 | R2_HAMMING_CHECK_OFF, R3_PAGE_HUNDREDS_0 | R3_HOLD_PAGE | R3_PAGE_HUNDREDS_DO_NOT_CARE, COMMAND_END)) { return -EIO; } t->is_searching[dau_no] = FALSE; return 0; } /* Handles ioctls defined in videotext.h * * Returns 0 if successful */ static int do_saa5246a_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg) { struct video_device *vd = video_devdata(file); struct saa5246a_device *t=vd->priv; switch(cmd) { case VTXIOCGETINFO: { vtx_info_t *info = arg; info->version_major = MAJOR_VERSION; info->version_minor = MINOR_VERSION; info->numpages = NUM_DAUS; return 0; } case VTXIOCCLRPAGE: { vtx_pagereq_t *req = arg; if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) return -EINVAL; memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0])); return 0; } case VTXIOCCLRFOUND: { vtx_pagereq_t *req = arg; if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) return -EINVAL; return(saa5246a_clear_found_bit(t, req->pgbuf)); } case VTXIOCPAGEREQ: { vtx_pagereq_t *req = arg; return(saa5246a_request_page(t, req)); } case VTXIOCGETSTAT: { vtx_pagereq_t *req = arg; vtx_pageinfo_t info; int rval; if ((rval = saa5246a_get_status(t, &info, req->pgbuf))) return rval; if(copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t))) return -EFAULT; return 0; } case VTXIOCGETPAGE: { vtx_pagereq_t *req = arg; return(saa5246a_get_page(t, req)); } case VTXIOCSTOPDAU: { vtx_pagereq_t *req = arg; return(saa5246a_stop_dau(t, req->pgbuf)); } case VTXIOCPUTPAGE: case VTXIOCSETDISP: case VTXIOCPUTSTAT: return 0; case VTXIOCCLRCACHE: { return 0; } case VTXIOCSETVIRT: { /* I do not know what "virtual mode" means */ return 0; } } return -EINVAL; } /* * Translates old vtx IOCTLs to new ones * * This keeps new kernel versions compatible with old userspace programs. */ static inline unsigned int vtx_fix_command(unsigned int cmd) { switch (cmd) { case VTXIOCGETINFO_OLD: cmd = VTXIOCGETINFO; break; case VTXIOCCLRPAGE_OLD: cmd = VTXIOCCLRPAGE; break; case VTXIOCCLRFOUND_OLD: cmd = VTXIOCCLRFOUND; break; case VTXIOCPAGEREQ_OLD: cmd = VTXIOCPAGEREQ; break; case VTXIOCGETSTAT_OLD: cmd = VTXIOCGETSTAT; break; case VTXIOCGETPAGE_OLD: cmd = VTXIOCGETPAGE; break; case VTXIOCSTOPDAU_OLD: cmd = VTXIOCSTOPDAU; break; case VTXIOCPUTPAGE_OLD: cmd = VTXIOCPUTPAGE; break; case VTXIOCSETDISP_OLD: cmd = VTXIOCSETDISP; break; case VTXIOCPUTSTAT_OLD: cmd = VTXIOCPUTSTAT; break; case VTXIOCCLRCACHE_OLD: cmd = VTXIOCCLRCACHE; break; case VTXIOCSETVIRT_OLD: cmd = VTXIOCSETVIRT; break; } return cmd; } /* * Handle the locking */ static int saa5246a_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct video_device *vd = video_devdata(file); struct saa5246a_device *t = vd->priv; int err; cmd = vtx_fix_command(cmd); mutex_lock(&t->lock); err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl); mutex_unlock(&t->lock); return err; } static int saa5246a_open(struct inode *inode, struct file *file) { struct video_device *vd = video_devdata(file); struct saa5246a_device *t = vd->priv; int err; err = video_exclusive_open(inode,file); if (err < 0) return err; if (t->client==NULL) { err = -ENODEV; goto fail; } if (i2c_senddata(t, SAA5246A_REGISTER_R0, R0_SELECT_R11 | R0_PLL_TIME_CONSTANT_LONG | R0_ENABLE_nODD_EVEN_OUTPUT | R0_ENABLE_HDR_POLL | R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED | R0_NO_FREE_RUN_PLL | R0_NO_AUTOMATIC_FASTEXT_PROMPT, R1_NON_INTERLACED_312_312_LINES | R1_DEW | R1_EXTENDED_PACKET_DISABLE | R1_DAUS_ALL_ON | R1_8_BITS_NO_PARITY | R1_VCS_TO_SCS, COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R4, /* We do not care much for the TV display but nevertheless we * need the currently displayed page later because only on that * page the time is updated. */ R4_DISPLAY_PAGE_4, COMMAND_END)) { err = -EIO; goto fail; } return 0; fail: video_exclusive_release(inode,file); return err; } static int saa5246a_release(struct inode *inode, struct file *file) { struct video_device *vd = video_devdata(file); struct saa5246a_device *t = vd->priv; /* Stop all acquisition circuits. */ i2c_senddata(t, SAA5246A_REGISTER_R1, R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES | R1_DEW | R1_EXTENDED_PACKET_DISABLE | R1_DAUS_ALL_OFF | R1_8_BITS_NO_PARITY | R1_VCS_TO_SCS, COMMAND_END); video_exclusive_release(inode,file); return 0; } static int __init init_saa_5246a (void) { printk(KERN_INFO "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n", MAJOR_VERSION, MINOR_VERSION); return i2c_add_driver(&i2c_driver_videotext); } static void __exit cleanup_saa_5246a (void) { i2c_del_driver(&i2c_driver_videotext); } module_init(init_saa_5246a); module_exit(cleanup_saa_5246a); static struct file_operations saa_fops = { .owner = THIS_MODULE, .open = saa5246a_open, .release = saa5246a_release, .ioctl = saa5246a_ioctl, .llseek = no_llseek, }; static struct video_device saa_template = { .owner = THIS_MODULE, .name = IF_NAME, .type = VID_TYPE_TELETEXT, .fops = &saa_fops, .release = video_device_release, .minor = -1, };