parport: remove CVS keywords
[linux-2.6.git] / drivers / parport / probe.c
1 /*
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 const struct {
15         const char *token;
16         const 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                                 kfree(info->mfr);
82                                 info->mfr = kstrdup(sep, GFP_KERNEL);
83                         } else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) {
84                                 kfree(info->model);
85                                 info->model = kstrdup(sep, GFP_KERNEL);
86                         } else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) {
87                                 int i;
88
89                                 kfree(info->class_name);
90                                 info->class_name = kstrdup(sep, GFP_KERNEL);
91                                 for (u = sep; *u; u++)
92                                         *u = toupper(*u);
93                                 for (i = 0; classes[i].token; i++) {
94                                         if (!strcmp(classes[i].token, sep)) {
95                                                 info->class = i;
96                                                 goto rock_on;
97                                         }
98                                 }
99                                 printk(KERN_WARNING "%s probe: warning, class '%s' not understood.\n", port->name, sep);
100                                 info->class = PARPORT_CLASS_OTHER;
101                         } else if (!strcmp(p, "CMD") ||
102                                    !strcmp(p, "COMMAND SET")) {
103                                 kfree(info->cmdset);
104                                 info->cmdset = kstrdup(sep, GFP_KERNEL);
105                                 /* if it speaks printer language, it's
106                                    probably a printer */
107                                 if (strstr(sep, "PJL") || strstr(sep, "PCL"))
108                                         guessed_class = PARPORT_CLASS_PRINTER;
109                         } else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) {
110                                 kfree(info->description);
111                                 info->description = kstrdup(sep, GFP_KERNEL);
112                         }
113                 }
114         rock_on:
115                 if (q)
116                         p = q + 1;
117                 else
118                         p = NULL;
119         }
120
121         /* If the device didn't tell us its class, maybe we have managed to
122            guess one from the things it did say. */
123         if (info->class == PARPORT_CLASS_UNSPEC)
124                 info->class = guessed_class;
125
126         pretty_print (port, device);
127
128         kfree(txt);
129 }
130
131 /* Read up to count-1 bytes of device id. Terminate buffer with
132  * '\0'. Buffer begins with two Device ID length bytes as given by
133  * device. */
134 static ssize_t parport_read_device_id (struct parport *port, char *buffer,
135                                        size_t count)
136 {
137         unsigned char length[2];
138         unsigned lelen, belen;
139         size_t idlens[4];
140         unsigned numidlens;
141         unsigned current_idlen;
142         ssize_t retval;
143         size_t len;
144
145         /* First two bytes are MSB,LSB of inclusive length. */
146         retval = parport_read (port, length, 2);
147
148         if (retval < 0)
149                 return retval;
150         if (retval != 2)
151                 return -EIO;
152
153         if (count < 2)
154                 return 0;
155         memcpy(buffer, length, 2);
156         len = 2;
157
158         /* Some devices wrongly send LE length, and some send it two
159          * bytes short. Construct a sorted array of lengths to try. */
160         belen = (length[0] << 8) + length[1];
161         lelen = (length[1] << 8) + length[0];
162         idlens[0] = min(belen, lelen);
163         idlens[1] = idlens[0]+2;
164         if (belen != lelen) {
165                 int off = 2;
166                 /* Don't try lengths of 0x100 and 0x200 as 1 and 2 */
167                 if (idlens[0] <= 2)
168                         off = 0;
169                 idlens[off] = max(belen, lelen);
170                 idlens[off+1] = idlens[off]+2;
171                 numidlens = off+2;
172         }
173         else {
174                 /* Some devices don't truly implement Device ID, but
175                  * just return constant nibble forever. This catches
176                  * also those cases. */
177                 if (idlens[0] == 0 || idlens[0] > 0xFFF) {
178                         printk (KERN_DEBUG "%s: reported broken Device ID"
179                                 " length of %#zX bytes\n",
180                                 port->name, idlens[0]);
181                         return -EIO;
182                 }
183                 numidlens = 2;
184         }
185
186         /* Try to respect the given ID length despite all the bugs in
187          * the ID length. Read according to shortest possible ID
188          * first. */
189         for (current_idlen = 0; current_idlen < numidlens; ++current_idlen) {
190                 size_t idlen = idlens[current_idlen];
191                 if (idlen+1 >= count)
192                         break;
193
194                 retval = parport_read (port, buffer+len, idlen-len);
195
196                 if (retval < 0)
197                         return retval;
198                 len += retval;
199
200                 if (port->physport->ieee1284.phase != IEEE1284_PH_HBUSY_DAVAIL) {
201                         if (belen != len) {
202                                 printk (KERN_DEBUG "%s: Device ID was %zd bytes"
203                                         " while device told it would be %d"
204                                         " bytes\n",
205                                         port->name, len, belen);
206                         }
207                         goto done;
208                 }
209
210                 /* This might end reading the Device ID too
211                  * soon. Hopefully the needed fields were already in
212                  * the first 256 bytes or so that we must have read so
213                  * far. */
214                 if (buffer[len-1] == ';') {
215                         printk (KERN_DEBUG "%s: Device ID reading stopped"
216                                 " before device told data not available. "
217                                 "Current idlen %u of %u, len bytes %02X %02X\n",
218                                 port->name, current_idlen, numidlens,
219                                 length[0], length[1]);
220                         goto done;
221                 }
222         }
223         if (current_idlen < numidlens) {
224                 /* Buffer not large enough, read to end of buffer. */
225                 size_t idlen, len2;
226                 if (len+1 < count) {
227                         retval = parport_read (port, buffer+len, count-len-1);
228                         if (retval < 0)
229                                 return retval;
230                         len += retval;
231                 }
232                 /* Read the whole ID since some devices would not
233                  * otherwise give back the Device ID from beginning
234                  * next time when asked. */
235                 idlen = idlens[current_idlen];
236                 len2 = len;
237                 while(len2 < idlen && retval > 0) {
238                         char tmp[4];
239                         retval = parport_read (port, tmp,
240                                                min(sizeof tmp, idlen-len2));
241                         if (retval < 0)
242                                 return retval;
243                         len2 += retval;
244                 }
245         }
246         /* In addition, there are broken devices out there that don't
247            even finish off with a semi-colon. We do not need to care
248            about those at this time. */
249  done:
250         buffer[len] = '\0';
251         return len;
252 }
253
254 /* Get Std 1284 Device ID. */
255 ssize_t parport_device_id (int devnum, char *buffer, size_t count)
256 {
257         ssize_t retval = -ENXIO;
258         struct pardevice *dev = parport_open (devnum, "Device ID probe");
259         if (!dev)
260                 return -ENXIO;
261
262         parport_claim_or_block (dev);
263
264         /* Negotiate to compatibility mode, and then to device ID
265          * mode. (This so that we start form beginning of device ID if
266          * already in device ID mode.) */
267         parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
268         retval = parport_negotiate (dev->port,
269                                     IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID);
270
271         if (!retval) {
272                 retval = parport_read_device_id (dev->port, buffer, count);
273                 parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
274                 if (retval > 2)
275                         parse_data (dev->port, dev->daisy, buffer+2);
276         }
277
278         parport_release (dev);
279         parport_close (dev);
280         return retval;
281 }