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linux/drivers/media/video/saa5246a.c
Hans Verkuil 1b8dac150a V4L/DVB (10499): saa7146: convert saa7146 and mxb in particular to v4l2_subdev. 
Modified mxb to load the i2c modules through v4l2_subdev. So no more probing.
Modified tea6415c and tea6420 to use the standard routing ops to do the
routing, rather than using private commands. Dropped the private commands
from tda9840 (they were never used except during initialization of the
module).

Added saa7146 support for VIDIOC_DBG_G_CHIP_IDENT.

Converted saa5246a and saa5249 to v4l2_subdev.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-03-30 12:42:42 -03:00

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/*
* 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@lxorguk.ukuu.org.uk>
*
* 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/mm.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/videotext.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-i2c-drv.h>
MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver");
MODULE_LICENSE("GPL");
#define MAJOR_VERSION 1 /* driver major version number */
#define MINOR_VERSION 8 /* driver minor version number */
/* Number of DAUs = number of pages that can be searched at the same time. */
#define NUM_DAUS 4
#define NUM_ROWS_PER_PAGE 40
/* first column is 0 (not 1) */
#define POS_TIME_START 32
#define POS_TIME_END 39
#define POS_HEADER_START 7
#define POS_HEADER_END 31
/* Returns 'true' if the part of the videotext page described with req contains
(at least parts of) the time field */
#define REQ_CONTAINS_TIME(p_req) \
((p_req)->start <= POS_TIME_END && \
(p_req)->end >= POS_TIME_START)
/* Returns 'true' if the part of the videotext page described with req contains
(at least parts of) the page header */
#define REQ_CONTAINS_HEADER(p_req) \
((p_req)->start <= POS_HEADER_END && \
(p_req)->end >= POS_HEADER_START)
/*****************************************************************************/
/* Mode register numbers of the SAA5246A */
/*****************************************************************************/
#define SAA5246A_REGISTER_R0 0
#define SAA5246A_REGISTER_R1 1
#define SAA5246A_REGISTER_R2 2
#define SAA5246A_REGISTER_R3 3
#define SAA5246A_REGISTER_R4 4
#define SAA5246A_REGISTER_R5 5
#define SAA5246A_REGISTER_R6 6
#define SAA5246A_REGISTER_R7 7
#define SAA5246A_REGISTER_R8 8
#define SAA5246A_REGISTER_R9 9
#define SAA5246A_REGISTER_R10 10
#define SAA5246A_REGISTER_R11 11
#define SAA5246A_REGISTER_R11B 11
/* SAA5246A mode registers often autoincrement to the next register.
Therefore we use variable argument lists. The following macro indicates
the end of a command list. */
#define COMMAND_END (-1)
/*****************************************************************************/
/* Contents of the mode registers of the SAA5246A */
/*****************************************************************************/
/* Register R0 (Advanced Control) */
#define R0_SELECT_R11 0x00
#define R0_SELECT_R11B 0x01
#define R0_PLL_TIME_CONSTANT_LONG 0x00
#define R0_PLL_TIME_CONSTANT_SHORT 0x02
#define R0_ENABLE_nODD_EVEN_OUTPUT 0x00
#define R0_DISABLE_nODD_EVEN_OUTPUT 0x04
#define R0_ENABLE_HDR_POLL 0x00
#define R0_DISABLE_HDR_POLL 0x10
#define R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED 0x00
#define R0_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED 0x20
#define R0_NO_FREE_RUN_PLL 0x00
#define R0_FREE_RUN_PLL 0x40
#define R0_NO_AUTOMATIC_FASTEXT_PROMPT 0x00
#define R0_AUTOMATIC_FASTEXT_PROMPT 0x80
/* Register R1 (Mode) */
#define R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES 0x00
#define R1_NON_INTERLACED_312_313_LINES 0x01
#define R1_NON_INTERLACED_312_312_LINES 0x02
#define R1_FFB_LEADING_EDGE_IN_FIRST_BROAD_PULSE 0x03
#define R1_FFB_LEADING_EDGE_IN_SECOND_BROAD_PULSE 0x07
#define R1_DEW 0x00
#define R1_FULL_FIELD 0x08
#define R1_EXTENDED_PACKET_DISABLE 0x00
#define R1_EXTENDED_PACKET_ENABLE 0x10
#define R1_DAUS_ALL_ON 0x00
#define R1_DAUS_ALL_OFF 0x20
#define R1_7_BITS_PLUS_PARITY 0x00
#define R1_8_BITS_NO_PARITY 0x40
#define R1_VCS_TO_SCS 0x00
#define R1_NO_VCS_TO_SCS 0x80
/* Register R2 (Page request address) */
#define R2_IN_R3_SELECT_PAGE_HUNDREDS 0x00
#define R2_IN_R3_SELECT_PAGE_TENS 0x01
#define R2_IN_R3_SELECT_PAGE_UNITS 0x02
#define R2_IN_R3_SELECT_HOURS_TENS 0x03
#define R2_IN_R3_SELECT_HOURS_UNITS 0x04
#define R2_IN_R3_SELECT_MINUTES_TENS 0x05
#define R2_IN_R3_SELECT_MINUTES_UNITS 0x06
#define R2_DAU_0 0x00
#define R2_DAU_1 0x10
#define R2_DAU_2 0x20
#define R2_DAU_3 0x30
#define R2_BANK_0 0x00
#define R2_BANK 1 0x40
#define R2_HAMMING_CHECK_ON 0x80
#define R2_HAMMING_CHECK_OFF 0x00
/* Register R3 (Page request data) */
#define R3_PAGE_HUNDREDS_0 0x00
#define R3_PAGE_HUNDREDS_1 0x01
#define R3_PAGE_HUNDREDS_2 0x02
#define R3_PAGE_HUNDREDS_3 0x03
#define R3_PAGE_HUNDREDS_4 0x04
#define R3_PAGE_HUNDREDS_5 0x05
#define R3_PAGE_HUNDREDS_6 0x06
#define R3_PAGE_HUNDREDS_7 0x07
#define R3_HOLD_PAGE 0x00
#define R3_UPDATE_PAGE 0x08
#define R3_PAGE_HUNDREDS_DO_NOT_CARE 0x00
#define R3_PAGE_HUNDREDS_DO_CARE 0x10
#define R3_PAGE_TENS_DO_NOT_CARE 0x00
#define R3_PAGE_TENS_DO_CARE 0x10
#define R3_PAGE_UNITS_DO_NOT_CARE 0x00
#define R3_PAGE_UNITS_DO_CARE 0x10
#define R3_HOURS_TENS_DO_NOT_CARE 0x00
#define R3_HOURS_TENS_DO_CARE 0x10
#define R3_HOURS_UNITS_DO_NOT_CARE 0x00
#define R3_HOURS_UNITS_DO_CARE 0x10
#define R3_MINUTES_TENS_DO_NOT_CARE 0x00
#define R3_MINUTES_TENS_DO_CARE 0x10
#define R3_MINUTES_UNITS_DO_NOT_CARE 0x00
#define R3_MINUTES_UNITS_DO_CARE 0x10
/* Register R4 (Display chapter) */
#define R4_DISPLAY_PAGE_0 0x00
#define R4_DISPLAY_PAGE_1 0x01
#define R4_DISPLAY_PAGE_2 0x02
#define R4_DISPLAY_PAGE_3 0x03
#define R4_DISPLAY_PAGE_4 0x04
#define R4_DISPLAY_PAGE_5 0x05
#define R4_DISPLAY_PAGE_6 0x06
#define R4_DISPLAY_PAGE_7 0x07
/* Register R5 (Normal display control) */
#define R5_PICTURE_INSIDE_BOXING_OFF 0x00
#define R5_PICTURE_INSIDE_BOXING_ON 0x01
#define R5_PICTURE_OUTSIDE_BOXING_OFF 0x00
#define R5_PICTURE_OUTSIDE_BOXING_ON 0x02
#define R5_TEXT_INSIDE_BOXING_OFF 0x00
#define R5_TEXT_INSIDE_BOXING_ON 0x04
#define R5_TEXT_OUTSIDE_BOXING_OFF 0x00
#define R5_TEXT_OUTSIDE_BOXING_ON 0x08
#define R5_CONTRAST_REDUCTION_INSIDE_BOXING_OFF 0x00
#define R5_CONTRAST_REDUCTION_INSIDE_BOXING_ON 0x10
#define R5_CONTRAST_REDUCTION_OUTSIDE_BOXING_OFF 0x00
#define R5_CONTRAST_REDUCTION_OUTSIDE_BOXING_ON 0x20
#define R5_BACKGROUND_COLOR_INSIDE_BOXING_OFF 0x00
#define R5_BACKGROUND_COLOR_INSIDE_BOXING_ON 0x40
#define R5_BACKGROUND_COLOR_OUTSIDE_BOXING_OFF 0x00
#define R5_BACKGROUND_COLOR_OUTSIDE_BOXING_ON 0x80
/* Register R6 (Newsflash display) */
#define R6_NEWSFLASH_PICTURE_INSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_PICTURE_INSIDE_BOXING_ON 0x01
#define R6_NEWSFLASH_PICTURE_OUTSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_PICTURE_OUTSIDE_BOXING_ON 0x02
#define R6_NEWSFLASH_TEXT_INSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_TEXT_INSIDE_BOXING_ON 0x04
#define R6_NEWSFLASH_TEXT_OUTSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_TEXT_OUTSIDE_BOXING_ON 0x08
#define R6_NEWSFLASH_CONTRAST_REDUCTION_INSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_CONTRAST_REDUCTION_INSIDE_BOXING_ON 0x10
#define R6_NEWSFLASH_CONTRAST_REDUCTION_OUTSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_CONTRAST_REDUCTION_OUTSIDE_BOXING_ON 0x20
#define R6_NEWSFLASH_BACKGROUND_COLOR_INSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_BACKGROUND_COLOR_INSIDE_BOXING_ON 0x40
#define R6_NEWSFLASH_BACKGROUND_COLOR_OUTSIDE_BOXING_OFF 0x00
#define R6_NEWSFLASH_BACKGROUND_COLOR_OUTSIDE_BOXING_ON 0x80
/* Register R7 (Display mode) */
#define R7_BOX_OFF_ROW_0 0x00
#define R7_BOX_ON_ROW_0 0x01
#define R7_BOX_OFF_ROW_1_TO_23 0x00
#define R7_BOX_ON_ROW_1_TO_23 0x02
#define R7_BOX_OFF_ROW_24 0x00
#define R7_BOX_ON_ROW_24 0x04
#define R7_SINGLE_HEIGHT 0x00
#define R7_DOUBLE_HEIGHT 0x08
#define R7_TOP_HALF 0x00
#define R7_BOTTOM_HALF 0x10
#define R7_REVEAL_OFF 0x00
#define R7_REVEAL_ON 0x20
#define R7_CURSER_OFF 0x00
#define R7_CURSER_ON 0x40
#define R7_STATUS_BOTTOM 0x00
#define R7_STATUS_TOP 0x80
/* Register R8 (Active chapter) */
#define R8_ACTIVE_CHAPTER_0 0x00
#define R8_ACTIVE_CHAPTER_1 0x01
#define R8_ACTIVE_CHAPTER_2 0x02
#define R8_ACTIVE_CHAPTER_3 0x03
#define R8_ACTIVE_CHAPTER_4 0x04
#define R8_ACTIVE_CHAPTER_5 0x05
#define R8_ACTIVE_CHAPTER_6 0x06
#define R8_ACTIVE_CHAPTER_7 0x07
#define R8_CLEAR_MEMORY 0x08
#define R8_DO_NOT_CLEAR_MEMORY 0x00
/* Register R9 (Curser row) */
#define R9_CURSER_ROW_0 0x00
#define R9_CURSER_ROW_1 0x01
#define R9_CURSER_ROW_2 0x02
#define R9_CURSER_ROW_25 0x19
/* Register R10 (Curser column) */
#define R10_CURSER_COLUMN_0 0x00
#define R10_CURSER_COLUMN_6 0x06
#define R10_CURSER_COLUMN_8 0x08
/*****************************************************************************/
/* Row 25 control data in column 0 to 9 */
/*****************************************************************************/
#define ROW25_COLUMN0_PAGE_UNITS 0x0F
#define ROW25_COLUMN1_PAGE_TENS 0x0F
#define ROW25_COLUMN2_MINUTES_UNITS 0x0F
#define ROW25_COLUMN3_MINUTES_TENS 0x07
#define ROW25_COLUMN3_DELETE_PAGE 0x08
#define ROW25_COLUMN4_HOUR_UNITS 0x0F
#define ROW25_COLUMN5_HOUR_TENS 0x03
#define ROW25_COLUMN5_INSERT_HEADLINE 0x04
#define ROW25_COLUMN5_INSERT_SUBTITLE 0x08
#define ROW25_COLUMN6_SUPPRESS_HEADER 0x01
#define ROW25_COLUMN6_UPDATE_PAGE 0x02
#define ROW25_COLUMN6_INTERRUPTED_SEQUENCE 0x04
#define ROW25_COLUMN6_SUPPRESS_DISPLAY 0x08
#define ROW25_COLUMN7_SERIAL_MODE 0x01
#define ROW25_COLUMN7_CHARACTER_SET 0x0E
#define ROW25_COLUMN8_PAGE_HUNDREDS 0x07
#define ROW25_COLUMN8_PAGE_NOT_FOUND 0x10
#define ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR 0x20
#define ROW25_COLUMN0_TO_7_HAMMING_ERROR 0x10
/*****************************************************************************/
/* Helper macros for extracting page, hour and minute digits */
/*****************************************************************************/
/* BYTE_POS 0 is at row 0, column 0,
BYTE_POS 1 is at row 0, column 1,
BYTE_POS 40 is at row 1, column 0, (with NUM_ROWS_PER_PAGE = 40)
BYTE_POS 41 is at row 1, column 1, (with NUM_ROWS_PER_PAGE = 40),
... */
#define ROW(BYTE_POS) (BYTE_POS / NUM_ROWS_PER_PAGE)
#define COLUMN(BYTE_POS) (BYTE_POS % NUM_ROWS_PER_PAGE)
/*****************************************************************************/
/* Helper macros for extracting page, hour and minute digits */
/*****************************************************************************/
/* Macros for extracting hundreds, tens and units of a page number which
must be in the range 0 ... 0x799.
Note that page is coded in hexadecimal, i.e. 0x123 means page 123.
page 0x.. means page 8.. */
#define HUNDREDS_OF_PAGE(page) (((page) / 0x100) & 0x7)
#define TENS_OF_PAGE(page) (((page) / 0x10) & 0xF)
#define UNITS_OF_PAGE(page) ((page) & 0xF)
/* Macros for extracting tens and units of a hour information which
must be in the range 0 ... 0x24.
Note that hour is coded in hexadecimal, i.e. 0x12 means 12 hours */
#define TENS_OF_HOUR(hour) ((hour) / 0x10)
#define UNITS_OF_HOUR(hour) ((hour) & 0xF)
/* Macros for extracting tens and units of a minute information which
must be in the range 0 ... 0x59.
Note that minute is coded in hexadecimal, i.e. 0x12 means 12 minutes */
#define TENS_OF_MINUTE(minute) ((minute) / 0x10)
#define UNITS_OF_MINUTE(minute) ((minute) & 0xF)
#define HOUR_MAX 0x23
#define MINUTE_MAX 0x59
#define PAGE_MAX 0x8FF
struct saa5246a_device
{
struct v4l2_subdev sd;
struct video_device *vdev;
u8 pgbuf[NUM_DAUS][VTX_VIRTUALSIZE];
int is_searching[NUM_DAUS];
unsigned long in_use;
struct mutex lock;
};
static inline struct saa5246a_device *to_dev(struct v4l2_subdev *sd)
{
return container_of(sd, struct saa5246a_device, sd);
}
static struct video_device saa_template; /* Declared near bottom */
/*
* I2C interfaces
*/
static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data)
{
struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
char buf[64];
buf[0] = reg;
memcpy(buf+1, data, count);
if (i2c_master_send(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;
va_end(argp);
return i2c_sendbuf(t, buf[0], ct-1, buf+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 saa5246a_device *t, int count, u8 *buf)
{
struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
if (i2c_master_recv(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 long do_saa5246a_ioctl(struct file *file, unsigned int cmd, void *arg)
{
struct saa5246a_device *t = video_drvdata(file);
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 long saa5246a_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct saa5246a_device *t = video_drvdata(file);
long err;
cmd = vtx_fix_command(cmd);
mutex_lock(&t->lock);
err = video_usercopy(file, cmd, arg, do_saa5246a_ioctl);
mutex_unlock(&t->lock);
return err;
}
static int saa5246a_open(struct file *file)
{
struct saa5246a_device *t = video_drvdata(file);
if (test_and_set_bit(0, &t->in_use))
return -EBUSY;
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))
{
clear_bit(0, &t->in_use);
return -EIO;
}
return 0;
}
static int saa5246a_release(struct file *file)
{
struct saa5246a_device *t = video_drvdata(file);
/* 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);
clear_bit(0, &t->in_use);
return 0;
}
static const struct v4l2_file_operations saa_fops = {
.owner = THIS_MODULE,
.open = saa5246a_open,
.release = saa5246a_release,
.ioctl = saa5246a_ioctl,
};
static struct video_device saa_template =
{
.name = "saa5246a",
.fops = &saa_fops,
.release = video_device_release,
.minor = -1,
};
static int saa5246a_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_SAA5246A, 0);
}
static const struct v4l2_subdev_core_ops saa5246a_core_ops = {
.g_chip_ident = saa5246a_g_chip_ident,
};
static const struct v4l2_subdev_ops saa5246a_ops = {
.core = &saa5246a_core_ops,
};
static int saa5246a_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int pgbuf;
int err;
struct saa5246a_device *t;
struct v4l2_subdev *sd;
v4l_info(client, "chip found @ 0x%x (%s)\n",
client->addr << 1, client->adapter->name);
v4l_info(client, "VideoText version %d.%d\n",
MAJOR_VERSION, MINOR_VERSION);
t = kzalloc(sizeof(*t), GFP_KERNEL);
if (t == NULL)
return -ENOMEM;
sd = &t->sd;
v4l2_i2c_subdev_init(sd, client, &saa5246a_ops);
mutex_init(&t->lock);
/* Now create a video4linux device */
t->vdev = video_device_alloc();
if (t->vdev == NULL) {
kfree(t);
return -ENOMEM;
}
memcpy(t->vdev, &saa_template, sizeof(*t->vdev));
for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) {
memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0]));
t->is_searching[pgbuf] = false;
}
video_set_drvdata(t->vdev, t);
/* Register it */
err = video_register_device(t->vdev, VFL_TYPE_VTX, -1);
if (err < 0) {
kfree(t);
video_device_release(t->vdev);
t->vdev = NULL;
return err;
}
return 0;
}
static int saa5246a_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct saa5246a_device *t = to_dev(sd);
video_unregister_device(t->vdev);
v4l2_device_unregister_subdev(sd);
kfree(t);
return 0;
}
static const struct i2c_device_id saa5246a_id[] = {
{ "saa5246a", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, saa5246a_id);
static struct v4l2_i2c_driver_data v4l2_i2c_data = {
.name = "saa5246a",
.probe = saa5246a_probe,
.remove = saa5246a_remove,
.id_table = saa5246a_id,
};
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