[PATCH] create a kstrdup library function
[linux-2.6.git] / 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 }