/*
- * Driver for the SAA5246A videotext decoder chip from Philips.
+ * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from
+ * Philips.
*
- * Only capturing of videotext pages is tested. The SAA5246A chip also has
- * a TV output but my hardware doesn't use it. For this reason this driver
- * does not support changing any TV display settings.
+ * 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>
*
#include <linux/videodev.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];
/* Addresses to scan */
static unsigned short normal_i2c[] = { I2C_ADDRESS, I2C_CLIENT_END };
static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
-static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
-static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
-static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
-static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
-static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
-
-static struct i2c_client_address_data addr_data = {
- normal_i2c, normal_i2c_range,
- probe, probe_range,
- ignore, ignore_range,
- force
-};
+I2C_CLIENT_INSMOD;
static struct i2c_client client_template;
*/
static int saa5246a_probe(struct i2c_adapter *adap)
{
- if (adap->class & I2C_ADAP_CLASS_TV_ANALOG)
+ if (adap->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adap, &addr_data, saa5246a_attach);
return 0;
}
};
static struct i2c_client client_template = {
- .id = -1,
.driver = &i2c_driver_videotext,
.name = "(unset)",
};
static inline int saa5246a_get_page(struct saa5246a_device *t,
vtx_pagereq_t *req)
{
- int start, end;
+ 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;
- /* Read "normal" part of page */
- end = min(req->end, VTX_PAGESIZE - 1);
- if (i2c_senddata(t, SAA5246A_REGISTER_R8,
- req->pgbuf |
- R8_DO_NOT_CLEAR_MEMORY,
+ buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
- ROW(req->start),
+ /* Read "normal" part of page */
+ err = -EIO;
- COLUMN(req->start),
+ 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;
- COMMAND_END) ||
- i2c_getdata(t, end - req->start + 1, req->buffer))
- {
- return -EIO;
- }
/* Always get the time from buffer 4, since this stupid SAA5246A only
* updates the currently displayed buffer...
*/
- if (REQ_CONTAINS_TIME(req))
- {
+ 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) ||
- i2c_getdata(t, end - start + 1,
- req->buffer + start - req->start))
- {
- return -EIO;
- }
+ 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])
- {
+ 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) ||
- i2c_getdata(t, end - start + 1,
- req->buffer + start - req->start))
- {
- return -EIO;
- }
+ 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;
}
-
- return 0;
+ err = 0;
+out:
+ kfree(buf);
+ return err;
}
/* Stops the acquisition circuit given in dau_no. The page buffer associated
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
*/
struct saa5246a_device *t = vd->priv;
int err;
+ cmd = vtx_fix_command(cmd);
down(&t->lock);
err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl);
up(&t->lock);
static int __init init_saa_5246a (void)
{
- printk(KERN_INFO "SAA5246A driver (" IF_NAME
- " interface) for VideoText version %d.%d\n",
+ printk(KERN_INFO
+ "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n",
MAJOR_VERSION, MINOR_VERSION);
return i2c_add_driver(&i2c_driver_videotext);
}
.release = video_device_release,
.minor = -1,
};
-
-MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff