drivers/parport/probe.c

   1 /* $Id: parport_probe.c,v 1.1 1999/07/03 08:56:17 davem Exp $
   2  * Parallel port device probing code
   3  *
   4  * Authors:    Carsten Gross, carsten@sol.wohnheim.uni-ulm.de
   5  *             Philip Blundell <philb@gnu.org>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/parport.h>
  10 #include <linux/ctype.h>
  11 #include <linux/string.h>
  12 #include <asm/uaccess.h>
  13
  14 static struct {
  15         char *token;
  16         char *descr;
  17 } classes[] = {
  18         { "",            "Legacy device" },
  19         { "PRINTER",     "Printer" },
  20         { "MODEM",       "Modem" },
  21         { "NET",         "Network device" },
  22         { "HDC",         "Hard disk" },
  23         { "PCMCIA",      "PCMCIA" },
  24         { "MEDIA",       "Multimedia device" },
  25         { "FDC",         "Floppy disk" },
  26         { "PORTS",       "Ports" },
  27         { "SCANNER",     "Scanner" },
  28         { "DIGICAM",     "Digital camera" },
  29         { "",            "Unknown device" },
  30         { "",            "Unspecified" },
  31         { "SCSIADAPTER", "SCSI adapter" },
  32         { NULL,          NULL }
  33 };
  34
  35 static void pretty_print(struct parport *port, int device)
  36 {
  37         struct parport_device_info *info = &port->probe_info[device + 1];
  38
  39         printk(KERN_INFO "%s", port->name);
  40
  41         if (device >= 0)
  42                 printk (" (addr %d)", device);
  43
  44         printk (": %s", classes[info->class].descr);
  45         if (info->class)
  46                 printk(", %s %s", info->mfr, info->model);
  47
  48         printk("\n");
  49 }
  50
  51 static void parse_data(struct parport *port, int device, char *str)
  52 {
  53         char *txt = kmalloc(strlen(str)+1, GFP_KERNEL);
  54         char *p = txt, *q;
  55         int guessed_class = PARPORT_CLASS_UNSPEC;
  56         struct parport_device_info *info = &port->probe_info[device + 1];
  57
  58         if (!txt) {
  59                 printk(KERN_WARNING "%s probe: memory squeeze\n", port->name);
  60                 return;
  61         }
  62         strcpy(txt, str);
  63         while (p) {
  64                 char *sep;
  65                 q = strchr(p, ';');
  66                 if (q) *q = 0;
  67                 sep = strchr(p, ':');
  68                 if (sep) {
  69                         char *u;
  70                         *(sep++) = 0;
  71                         /* Get rid of trailing blanks */
  72                         u = sep + strlen (sep) - 1;
  73                         while (u >= p && *u == ' ')
  74                                 *u-- = '\0';
  75                         u = p;
  76                         while (*u) {
  77                                 *u = toupper(*u);
  78                                 u++;
  79                         }
  80                         if (!strcmp(p, "MFG") || !strcmp(p, "MANUFACTURER")) {
  81                                 if (info->mfr)
  82                                         kfree (info->mfr);
  83                                 info->mfr = kstrdup(sep, GFP_KERNEL);
  84                         } else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) {
  85                                 if (info->model)
  86                                         kfree (info->model);
  87                                 info->model = kstrdup(sep, GFP_KERNEL);
  88                         } else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) {
  89                                 int i;
  90                                 if (info->class_name)
  91                                         kfree (info->class_name);
  92                                 info->class_name = kstrdup(sep, GFP_KERNEL);
  93                                 for (u = sep; *u; u++)
  94                                         *u = toupper(*u);
  95                                 for (i = 0; classes[i].token; i++) {
  96                                         if (!strcmp(classes[i].token, sep)) {
  97                                                 info->class = i;
  98                                                 goto rock_on;
  99                                         }
 100                                 }
 101                                 printk(KERN_WARNING "%s probe: warning, class '%s' not understood.\n", port->name, sep);
 102                                 info->class = PARPORT_CLASS_OTHER;
 103                         } else if (!strcmp(p, "CMD") ||
 104                                    !strcmp(p, "COMMAND SET")) {
 105                                 if (info->cmdset)
 106                                         kfree (info->cmdset);
 107                                 info->cmdset = kstrdup(sep, GFP_KERNEL);
 108                                 /* if it speaks printer language, it's
 109                                    probably a printer */
 110                                 if (strstr(sep, "PJL") || strstr(sep, "PCL"))
 111                                         guessed_class = PARPORT_CLASS_PRINTER;
 112                         } else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) {
 113                                 if (info->description)
 114                                         kfree (info->description);
 115                                 info->description = kstrdup(sep, GFP_KERNEL);
 116                         }
 117                 }
 118         rock_on:
 119                 if (q) p = q+1; else p=NULL;
 120         }
 121
 122         /* If the device didn't tell us its class, maybe we have managed to
 123            guess one from the things it did say. */
 124         if (info->class == PARPORT_CLASS_UNSPEC)
 125                 info->class = guessed_class;
 126
 127         pretty_print (port, device);
 128
 129         kfree(txt);
 130 }
 131
 132 /* Get Std 1284 Device ID. */
 133 ssize_t parport_device_id (int devnum, char *buffer, size_t len)
 134 {
 135         ssize_t retval = -ENXIO;
 136         struct pardevice *dev = parport_open (devnum, "Device ID probe",
 137                                               NULL, NULL, NULL, 0, NULL);
 138         if (!dev)
 139                 return -ENXIO;
 140
 141         parport_claim_or_block (dev);
 142
 143         /* Negotiate to compatibility mode, and then to device ID mode.
 144          * (This is in case we are already in device ID mode.) */
 145         parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
 146         retval = parport_negotiate (dev->port,
 147                                     IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID);
 148
 149         if (!retval) {
 150                 int idlen;
 151                 unsigned char length[2];
 152
 153                 /* First two bytes are MSB,LSB of inclusive length. */
 154                 retval = parport_read (dev->port, length, 2);
 155
 156                 if (retval != 2) goto end_id;
 157
 158                 idlen = (length[0] << 8) + length[1] - 2;
 159                 /*
 160                  * Check if the caller-allocated buffer is large enough
 161                  * otherwise bail out or there will be an at least off by one.
 162                  */
 163                 if (idlen + 1 < len)
 164                         len = idlen;
 165                 else {
 166                         retval = -EINVAL;
 167                         goto out;
 168                 }
 169                 retval = parport_read (dev->port, buffer, len);
 170
 171                 if (retval != len)
 172                         printk (KERN_DEBUG "%s: only read %Zd of %Zd ID bytes\n",
 173                                 dev->port->name, retval,
 174                                 len);
 175
 176                 /* Some printer manufacturers mistakenly believe that
 177                    the length field is supposed to be _exclusive_.
 178                    In addition, there are broken devices out there
 179                    that don't even finish off with a semi-colon. */
 180                 if (buffer[len - 1] != ';') {
 181                         ssize_t diff;
 182                         diff = parport_read (dev->port, buffer + len, 2);
 183                         retval += diff;
 184
 185                         if (diff)
 186                                 printk (KERN_DEBUG
 187                                         "%s: device reported incorrect "
 188                                         "length field (%d, should be %Zd)\n",
 189                                         dev->port->name, idlen, retval);
 190                         else {
 191                                 /* One semi-colon short of a device ID. */
 192                                 buffer[len++] = ';';
 193                                 printk (KERN_DEBUG "%s: faking semi-colon\n",
 194                                         dev->port->name);
 195
 196                                 /* If we get here, I don't think we
 197                                    need to worry about the possible
 198                                    standard violation of having read
 199                                    more than we were told to.  The
 200                                    device is non-compliant anyhow. */
 201                         }
 202                 }
 203
 204         end_id:
 205                 buffer[len] = '\0';
 206                 parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
 207         }
 208
 209         if (retval > 2)
 210                 parse_data (dev->port, dev->daisy, buffer);
 211
 212 out:
 213         parport_release (dev);
 214         parport_close (dev);
 215         return retval;
 216 }