282 lines
7.4 KiB
C
282 lines
7.4 KiB
C
/*
|
|
* 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 <linux/slab.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
static const struct {
|
|
const char *token;
|
|
const 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 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")) {
|
|
kfree(info->mfr);
|
|
info->mfr = kstrdup(sep, GFP_KERNEL);
|
|
} else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) {
|
|
kfree(info->model);
|
|
info->model = kstrdup(sep, GFP_KERNEL);
|
|
} else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) {
|
|
int i;
|
|
|
|
kfree(info->class_name);
|
|
info->class_name = kstrdup(sep, GFP_KERNEL);
|
|
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")) {
|
|
kfree(info->cmdset);
|
|
info->cmdset = kstrdup(sep, GFP_KERNEL);
|
|
/* 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")) {
|
|
kfree(info->description);
|
|
info->description = kstrdup(sep, GFP_KERNEL);
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
|
|
/* Read up to count-1 bytes of device id. Terminate buffer with
|
|
* '\0'. Buffer begins with two Device ID length bytes as given by
|
|
* device. */
|
|
static ssize_t parport_read_device_id (struct parport *port, char *buffer,
|
|
size_t count)
|
|
{
|
|
unsigned char length[2];
|
|
unsigned lelen, belen;
|
|
size_t idlens[4];
|
|
unsigned numidlens;
|
|
unsigned current_idlen;
|
|
ssize_t retval;
|
|
size_t len;
|
|
|
|
/* First two bytes are MSB,LSB of inclusive length. */
|
|
retval = parport_read (port, length, 2);
|
|
|
|
if (retval < 0)
|
|
return retval;
|
|
if (retval != 2)
|
|
return -EIO;
|
|
|
|
if (count < 2)
|
|
return 0;
|
|
memcpy(buffer, length, 2);
|
|
len = 2;
|
|
|
|
/* Some devices wrongly send LE length, and some send it two
|
|
* bytes short. Construct a sorted array of lengths to try. */
|
|
belen = (length[0] << 8) + length[1];
|
|
lelen = (length[1] << 8) + length[0];
|
|
idlens[0] = min(belen, lelen);
|
|
idlens[1] = idlens[0]+2;
|
|
if (belen != lelen) {
|
|
int off = 2;
|
|
/* Don't try lengths of 0x100 and 0x200 as 1 and 2 */
|
|
if (idlens[0] <= 2)
|
|
off = 0;
|
|
idlens[off] = max(belen, lelen);
|
|
idlens[off+1] = idlens[off]+2;
|
|
numidlens = off+2;
|
|
}
|
|
else {
|
|
/* Some devices don't truly implement Device ID, but
|
|
* just return constant nibble forever. This catches
|
|
* also those cases. */
|
|
if (idlens[0] == 0 || idlens[0] > 0xFFF) {
|
|
printk (KERN_DEBUG "%s: reported broken Device ID"
|
|
" length of %#zX bytes\n",
|
|
port->name, idlens[0]);
|
|
return -EIO;
|
|
}
|
|
numidlens = 2;
|
|
}
|
|
|
|
/* Try to respect the given ID length despite all the bugs in
|
|
* the ID length. Read according to shortest possible ID
|
|
* first. */
|
|
for (current_idlen = 0; current_idlen < numidlens; ++current_idlen) {
|
|
size_t idlen = idlens[current_idlen];
|
|
if (idlen+1 >= count)
|
|
break;
|
|
|
|
retval = parport_read (port, buffer+len, idlen-len);
|
|
|
|
if (retval < 0)
|
|
return retval;
|
|
len += retval;
|
|
|
|
if (port->physport->ieee1284.phase != IEEE1284_PH_HBUSY_DAVAIL) {
|
|
if (belen != len) {
|
|
printk (KERN_DEBUG "%s: Device ID was %zd bytes"
|
|
" while device told it would be %d"
|
|
" bytes\n",
|
|
port->name, len, belen);
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/* This might end reading the Device ID too
|
|
* soon. Hopefully the needed fields were already in
|
|
* the first 256 bytes or so that we must have read so
|
|
* far. */
|
|
if (buffer[len-1] == ';') {
|
|
printk (KERN_DEBUG "%s: Device ID reading stopped"
|
|
" before device told data not available. "
|
|
"Current idlen %u of %u, len bytes %02X %02X\n",
|
|
port->name, current_idlen, numidlens,
|
|
length[0], length[1]);
|
|
goto done;
|
|
}
|
|
}
|
|
if (current_idlen < numidlens) {
|
|
/* Buffer not large enough, read to end of buffer. */
|
|
size_t idlen, len2;
|
|
if (len+1 < count) {
|
|
retval = parport_read (port, buffer+len, count-len-1);
|
|
if (retval < 0)
|
|
return retval;
|
|
len += retval;
|
|
}
|
|
/* Read the whole ID since some devices would not
|
|
* otherwise give back the Device ID from beginning
|
|
* next time when asked. */
|
|
idlen = idlens[current_idlen];
|
|
len2 = len;
|
|
while(len2 < idlen && retval > 0) {
|
|
char tmp[4];
|
|
retval = parport_read (port, tmp,
|
|
min(sizeof tmp, idlen-len2));
|
|
if (retval < 0)
|
|
return retval;
|
|
len2 += retval;
|
|
}
|
|
}
|
|
/* In addition, there are broken devices out there that don't
|
|
even finish off with a semi-colon. We do not need to care
|
|
about those at this time. */
|
|
done:
|
|
buffer[len] = '\0';
|
|
return len;
|
|
}
|
|
|
|
/* Get Std 1284 Device ID. */
|
|
ssize_t parport_device_id (int devnum, char *buffer, size_t count)
|
|
{
|
|
ssize_t retval = -ENXIO;
|
|
struct pardevice *dev = parport_open (devnum, "Device ID probe");
|
|
if (!dev)
|
|
return -ENXIO;
|
|
|
|
parport_claim_or_block (dev);
|
|
|
|
/* Negotiate to compatibility mode, and then to device ID
|
|
* mode. (This so that we start form beginning of device ID if
|
|
* already in device ID mode.) */
|
|
parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
|
|
retval = parport_negotiate (dev->port,
|
|
IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID);
|
|
|
|
if (!retval) {
|
|
retval = parport_read_device_id (dev->port, buffer, count);
|
|
parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
|
|
if (retval > 2)
|
|
parse_data (dev->port, dev->daisy, buffer+2);
|
|
}
|
|
|
|
parport_release (dev);
|
|
parport_close (dev);
|
|
return retval;
|
|
}
|