Merge branch 'master'
[platform/adaptation/renesas_rcar/renesas_kernel.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                                 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 /* Get Std 1284 Device ID. */
132 ssize_t parport_device_id (int devnum, char *buffer, size_t len)
133 {
134         ssize_t retval = -ENXIO;
135         struct pardevice *dev = parport_open (devnum, "Device ID probe",
136                                               NULL, NULL, NULL, 0, NULL);
137         if (!dev)
138                 return -ENXIO;
139
140         parport_claim_or_block (dev);
141
142         /* Negotiate to compatibility mode, and then to device ID mode.
143          * (This is in case we are already in device ID mode.) */
144         parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
145         retval = parport_negotiate (dev->port,
146                                     IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID);
147
148         if (!retval) {
149                 int idlen;
150                 unsigned char length[2];
151
152                 /* First two bytes are MSB,LSB of inclusive length. */
153                 retval = parport_read (dev->port, length, 2);
154
155                 if (retval != 2) goto end_id;
156
157                 idlen = (length[0] << 8) + length[1] - 2;
158                 /*
159                  * Check if the caller-allocated buffer is large enough
160                  * otherwise bail out or there will be an at least off by one.
161                  */
162                 if (idlen + 1 < len)
163                         len = idlen;
164                 else {
165                         retval = -EINVAL;
166                         goto out;
167                 }
168                 retval = parport_read (dev->port, buffer, len);
169
170                 if (retval != len)
171                         printk (KERN_DEBUG "%s: only read %Zd of %Zd ID bytes\n",
172                                 dev->port->name, retval,
173                                 len);
174
175                 /* Some printer manufacturers mistakenly believe that
176                    the length field is supposed to be _exclusive_.
177                    In addition, there are broken devices out there
178                    that don't even finish off with a semi-colon. */
179                 if (buffer[len - 1] != ';') {
180                         ssize_t diff;
181                         diff = parport_read (dev->port, buffer + len, 2);
182                         retval += diff;
183
184                         if (diff)
185                                 printk (KERN_DEBUG
186                                         "%s: device reported incorrect "
187                                         "length field (%d, should be %Zd)\n",
188                                         dev->port->name, idlen, retval);
189                         else {
190                                 /* One semi-colon short of a device ID. */
191                                 buffer[len++] = ';';
192                                 printk (KERN_DEBUG "%s: faking semi-colon\n",
193                                         dev->port->name);
194
195                                 /* If we get here, I don't think we
196                                    need to worry about the possible
197                                    standard violation of having read
198                                    more than we were told to.  The
199                                    device is non-compliant anyhow. */
200                         }
201                 }
202
203         end_id:
204                 buffer[len] = '\0';
205                 parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
206         }
207
208         if (retval > 2)
209                 parse_data (dev->port, dev->daisy, buffer);
210
211 out:
212         parport_release (dev);
213         parport_close (dev);
214         return retval;
215 }