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linux/drivers/media/video/saa5249.c

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/*
* Modified in order to keep it compatible both with new and old videotext IOCTLs by
* Michael Geng <linux@MichaelGeng.de>
*
* 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 <Alan.Cox@linux.org>
*
* 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 <richard.guenther@student.uni-tuebingen.de>
*
* $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 <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/errno.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <stdarg.h>
#include <linux/i2c.h>
#include <linux/videotext.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#define VTX_VER_MAJ 1
#define VTX_VER_MIN 8
#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 msecs_to_jiffies(300) /* Time between requesting page and */
/* checking status bits */
#define PGBUF_EXPIRE msecs_to_jiffies(15000) /* 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_client *client;
struct mutex lock;
};
#define CCTWR 34 /* I<>C write/read-address of vtx-chip */
#define CCTRD 35
#define NOACK_REPEAT 10 /* Retry access this many times on failure */
#define CLEAR_DELAY msecs_to_jiffies(50) /* Time required to clear a page */
#define READY_TIMEOUT msecs_to_jiffies(30) /* 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 */
#define RESCHED do { cond_resched(); } while(0)
static struct video_device saa_template; /* Declared near bottom */
/* Addresses to scan */
static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
I2C_CLIENT_INSMOD;
static struct i2c_client client_template;
static int saa5249_attach(struct i2c_adapter *adap, int addr, int kind)
{
int pgbuf;
int err;
struct i2c_client *client;
struct video_device *vd;
struct saa5249_device *t;
printk(KERN_INFO "saa5249: 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 = kmalloc(sizeof(struct video_device), GFP_KERNEL);
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->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;
/*
* Register it
*/
if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
{
kfree(t);
kfree(vd);
kfree(client);
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 saa5249_probe(struct i2c_adapter *adap)
{
if (adap->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adap, &addr_data, saa5249_attach);
return 0;
}
static int saa5249_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(vd);
kfree(client);
return 0;
}
/* new I2C driver support */
static struct i2c_driver i2c_driver_videotext =
{
.driver = {
.name = IF_NAME, /* name */
},
.id = I2C_DRIVERID_SAA5249, /* in i2c.h */
.attach_adapter = saa5249_probe,
.detach_client = saa5249_detach,
};
static struct i2c_client client_template = {
.driver = &i2c_driver_videotext,
.name = "(unset)",
};
/*
* 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(&current->sighand->siglock);
sigfillset(&current->blocked);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
msleep_interruptible(jiffies_to_msecs(delay));
spin_lock_irq(&current->sighand->siglock);
current->blocked = oldblocked;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
}
/*
* I2C interfaces
*/
static int i2c_sendbuf(struct saa5249_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 saa5249_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 saa5249_device *t, int count, u8 *buf)
{
if(i2c_master_recv(t->client, buf, count)!=count)
return -1;
return 0;
}
/*
* Standard character-device-driver functions
*/
static int do_saa5249_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
static int virtual_mode = false;
struct video_device *vd = video_devdata(file);
struct saa5249_device *t=vd->priv;
switch(cmd)
{
case VTXIOCGETINFO:
{
vtx_info_t *info = arg;
info->version_major = VTX_VER_MAJ;
info->version_minor = VTX_VER_MIN;
info->numpages = NUM_DAUS;
/*info->cct_type = CCT_TYPE;*/
return 0;
}
case VTXIOCCLRPAGE:
{
vtx_pagereq_t *req = arg;
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 = arg;
if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
return -EINVAL;
t->vdau[req->pgbuf].clrfound = true;
return 0;
}
case VTXIOCPAGEREQ:
{
vtx_pagereq_t *req = arg;
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 = arg;
u8 infobits[10];
vtx_pageinfo_t info;
int a;
if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
return -EINVAL;
if (!t->vdau[req->pgbuf].stopped)
{
if (i2c_senddata(t, 2, 0, -1) ||
i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
i2c_senddata(t, 8, 0, 25, 0, -1))
return -EIO;
jdelay(PAGE_WAIT);
if (i2c_getdata(t, 10, infobits))
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, 8, 0, 0, 0, -1) ||
i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
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, 8, 0, 0x20, 0, -1) ||
i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
return -EIO;
/* Packet X/27/0 */
if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
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, 8, 0, 0x22, 0, -1) ||
i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
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 = arg;
int start, end;
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)
{
int len;
char buf[16];
start = max(req->start, 32);
end = min(req->end, 39);
len=end-start+1;
if (i2c_senddata(t, 8, 0, 0, start, -1) ||
i2c_getdata(t, len, buf))
return -EIO;
if(copy_to_user(req->buffer+start-req->start, buf, len))
return -EFAULT;
}
/* Insert the current header if DAU is still searching for a page */
if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf])
{
char buf[32];
int len;
start = max(req->start, 7);
end = min(req->end, 31);
len=end-start+1;
if (i2c_senddata(t, 8, 0, 0, start, -1) ||
i2c_getdata(t, len, buf))
return -EIO;
if(copy_to_user(req->buffer+start-req->start, buf, len))
return -EFAULT;
}
return 0;
}
case VTXIOCSTOPDAU:
{
vtx_pagereq_t *req = arg;
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, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
return -EIO;
if (i2c_senddata(t, 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)(long)arg;
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 saa5249_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct video_device *vd = video_devdata(file);
struct saa5249_device *t=vd->priv;
int err;
cmd = vtx_fix_command(cmd);
mutex_lock(&t->lock);
err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
mutex_unlock(&t->lock);
return err;
}
static int saa5249_open(struct inode *inode, struct file *file)
{
struct video_device *vd = video_devdata(file);
struct saa5249_device *t=vd->priv;
int err,pgbuf;
err = video_exclusive_open(inode,file);
if (err < 0)
return err;
if (t->client==NULL) {
err = -ENODEV;
goto fail;
}
if (i2c_senddata(t, 0, 0, -1) || /* Select R11 */
/* Turn off parity checks (we do this ourselves) */
i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
/* Display TV-picture, no virtual rows */
i2c_senddata(t, 4, NUM_DAUS, disp_modes[t->disp_mode][1], disp_modes[t->disp_mode][2], 7, -1)) /* Set display to page 4 */
{
err = -EIO;
goto fail;
}
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;
return 0;
fail:
video_exclusive_release(inode,file);
return err;
}
static int saa5249_release(struct inode *inode, struct file *file)
{
struct video_device *vd = video_devdata(file);
struct saa5249_device *t=vd->priv;
i2c_senddata(t, 1, 0x20, -1); /* Turn off CCT */
i2c_senddata(t, 5, 3, 3, -1); /* Turn off TV-display */
video_exclusive_release(inode,file);
return 0;
}
static int __init init_saa_5249 (void)
{
printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
VTX_VER_MAJ, VTX_VER_MIN);
return i2c_add_driver(&i2c_driver_videotext);
}
static void __exit cleanup_saa_5249 (void)
{
i2c_del_driver(&i2c_driver_videotext);
}
module_init(init_saa_5249);
module_exit(cleanup_saa_5249);
static const struct file_operations saa_fops = {
.owner = THIS_MODULE,
.open = saa5249_open,
.release = saa5249_release,
.ioctl = saa5249_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device saa_template =
{
.owner = THIS_MODULE,
.name = IF_NAME,
.type = VID_TYPE_TELETEXT, /*| VID_TYPE_TUNER ?? */
.fops = &saa_fops,
};
MODULE_LICENSE("GPL");
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