![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
225 lines
5.9 KiB
C
225 lines
5.9 KiB
C
/* $Id: parport_probe.c,v 1.1 1999/07/03 08:56:17 davem Exp $
|
|
* Parallel port device probing code
|
|
*
|
|
* Authors: Carsten Gross, carsten@sol.wohnheim.uni-ulm.de
|
|
* Philip Blundell <philb@gnu.org>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/parport.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/string.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
static struct {
|
|
char *token;
|
|
char *descr;
|
|
} classes[] = {
|
|
{ "", "Legacy device" },
|
|
{ "PRINTER", "Printer" },
|
|
{ "MODEM", "Modem" },
|
|
{ "NET", "Network device" },
|
|
{ "HDC", "Hard disk" },
|
|
{ "PCMCIA", "PCMCIA" },
|
|
{ "MEDIA", "Multimedia device" },
|
|
{ "FDC", "Floppy disk" },
|
|
{ "PORTS", "Ports" },
|
|
{ "SCANNER", "Scanner" },
|
|
{ "DIGICAM", "Digital camera" },
|
|
{ "", "Unknown device" },
|
|
{ "", "Unspecified" },
|
|
{ "SCSIADAPTER", "SCSI adapter" },
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
static void pretty_print(struct parport *port, int device)
|
|
{
|
|
struct parport_device_info *info = &port->probe_info[device + 1];
|
|
|
|
printk(KERN_INFO "%s", port->name);
|
|
|
|
if (device >= 0)
|
|
printk (" (addr %d)", device);
|
|
|
|
printk (": %s", classes[info->class].descr);
|
|
if (info->class)
|
|
printk(", %s %s", info->mfr, info->model);
|
|
|
|
printk("\n");
|
|
}
|
|
|
|
static char *strdup(char *str)
|
|
{
|
|
int n = strlen(str)+1;
|
|
char *s = kmalloc(n, GFP_KERNEL);
|
|
if (!s) return NULL;
|
|
return strcpy(s, str);
|
|
}
|
|
|
|
static void parse_data(struct parport *port, int device, char *str)
|
|
{
|
|
char *txt = kmalloc(strlen(str)+1, GFP_KERNEL);
|
|
char *p = txt, *q;
|
|
int guessed_class = PARPORT_CLASS_UNSPEC;
|
|
struct parport_device_info *info = &port->probe_info[device + 1];
|
|
|
|
if (!txt) {
|
|
printk(KERN_WARNING "%s probe: memory squeeze\n", port->name);
|
|
return;
|
|
}
|
|
strcpy(txt, str);
|
|
while (p) {
|
|
char *sep;
|
|
q = strchr(p, ';');
|
|
if (q) *q = 0;
|
|
sep = strchr(p, ':');
|
|
if (sep) {
|
|
char *u;
|
|
*(sep++) = 0;
|
|
/* Get rid of trailing blanks */
|
|
u = sep + strlen (sep) - 1;
|
|
while (u >= p && *u == ' ')
|
|
*u-- = '\0';
|
|
u = p;
|
|
while (*u) {
|
|
*u = toupper(*u);
|
|
u++;
|
|
}
|
|
if (!strcmp(p, "MFG") || !strcmp(p, "MANUFACTURER")) {
|
|
if (info->mfr)
|
|
kfree (info->mfr);
|
|
info->mfr = strdup(sep);
|
|
} else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) {
|
|
if (info->model)
|
|
kfree (info->model);
|
|
info->model = strdup(sep);
|
|
} else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) {
|
|
int i;
|
|
if (info->class_name)
|
|
kfree (info->class_name);
|
|
info->class_name = strdup(sep);
|
|
for (u = sep; *u; u++)
|
|
*u = toupper(*u);
|
|
for (i = 0; classes[i].token; i++) {
|
|
if (!strcmp(classes[i].token, sep)) {
|
|
info->class = i;
|
|
goto rock_on;
|
|
}
|
|
}
|
|
printk(KERN_WARNING "%s probe: warning, class '%s' not understood.\n", port->name, sep);
|
|
info->class = PARPORT_CLASS_OTHER;
|
|
} else if (!strcmp(p, "CMD") ||
|
|
!strcmp(p, "COMMAND SET")) {
|
|
if (info->cmdset)
|
|
kfree (info->cmdset);
|
|
info->cmdset = strdup(sep);
|
|
/* if it speaks printer language, it's
|
|
probably a printer */
|
|
if (strstr(sep, "PJL") || strstr(sep, "PCL"))
|
|
guessed_class = PARPORT_CLASS_PRINTER;
|
|
} else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) {
|
|
if (info->description)
|
|
kfree (info->description);
|
|
info->description = strdup(sep);
|
|
}
|
|
}
|
|
rock_on:
|
|
if (q) p = q+1; else p=NULL;
|
|
}
|
|
|
|
/* If the device didn't tell us its class, maybe we have managed to
|
|
guess one from the things it did say. */
|
|
if (info->class == PARPORT_CLASS_UNSPEC)
|
|
info->class = guessed_class;
|
|
|
|
pretty_print (port, device);
|
|
|
|
kfree(txt);
|
|
}
|
|
|
|
/* Get Std 1284 Device ID. */
|
|
ssize_t parport_device_id (int devnum, char *buffer, size_t len)
|
|
{
|
|
ssize_t retval = -ENXIO;
|
|
struct pardevice *dev = parport_open (devnum, "Device ID probe",
|
|
NULL, NULL, NULL, 0, NULL);
|
|
if (!dev)
|
|
return -ENXIO;
|
|
|
|
parport_claim_or_block (dev);
|
|
|
|
/* Negotiate to compatibility mode, and then to device ID mode.
|
|
* (This is in case we are already in device ID mode.) */
|
|
parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
|
|
retval = parport_negotiate (dev->port,
|
|
IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID);
|
|
|
|
if (!retval) {
|
|
int idlen;
|
|
unsigned char length[2];
|
|
|
|
/* First two bytes are MSB,LSB of inclusive length. */
|
|
retval = parport_read (dev->port, length, 2);
|
|
|
|
if (retval != 2) goto end_id;
|
|
|
|
idlen = (length[0] << 8) + length[1] - 2;
|
|
/*
|
|
* Check if the caller-allocated buffer is large enough
|
|
* otherwise bail out or there will be an at least off by one.
|
|
*/
|
|
if (idlen + 1 < len)
|
|
len = idlen;
|
|
else {
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
retval = parport_read (dev->port, buffer, len);
|
|
|
|
if (retval != len)
|
|
printk (KERN_DEBUG "%s: only read %Zd of %Zd ID bytes\n",
|
|
dev->port->name, retval,
|
|
len);
|
|
|
|
/* Some printer manufacturers mistakenly believe that
|
|
the length field is supposed to be _exclusive_.
|
|
In addition, there are broken devices out there
|
|
that don't even finish off with a semi-colon. */
|
|
if (buffer[len - 1] != ';') {
|
|
ssize_t diff;
|
|
diff = parport_read (dev->port, buffer + len, 2);
|
|
retval += diff;
|
|
|
|
if (diff)
|
|
printk (KERN_DEBUG
|
|
"%s: device reported incorrect "
|
|
"length field (%d, should be %Zd)\n",
|
|
dev->port->name, idlen, retval);
|
|
else {
|
|
/* One semi-colon short of a device ID. */
|
|
buffer[len++] = ';';
|
|
printk (KERN_DEBUG "%s: faking semi-colon\n",
|
|
dev->port->name);
|
|
|
|
/* If we get here, I don't think we
|
|
need to worry about the possible
|
|
standard violation of having read
|
|
more than we were told to. The
|
|
device is non-compliant anyhow. */
|
|
}
|
|
}
|
|
|
|
end_id:
|
|
buffer[len] = '\0';
|
|
parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
|
|
}
|
|
|
|
if (retval > 2)
|
|
parse_data (dev->port, dev->daisy, buffer);
|
|
|
|
out:
|
|
parport_release (dev);
|
|
parport_close (dev);
|
|
return retval;
|
|
}
|