Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/drivers/parport/probe.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 6005 byte(s)
Tag kernel26-2.6.12-alx-r9
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 char *strdup(char *str) |
52 | { |
53 | int n = strlen(str)+1; |
54 | char *s = kmalloc(n, GFP_KERNEL); |
55 | if (!s) return NULL; |
56 | return strcpy(s, str); |
57 | } |
58 | |
59 | static void parse_data(struct parport *port, int device, char *str) |
60 | { |
61 | char *txt = kmalloc(strlen(str)+1, GFP_KERNEL); |
62 | char *p = txt, *q; |
63 | int guessed_class = PARPORT_CLASS_UNSPEC; |
64 | struct parport_device_info *info = &port->probe_info[device + 1]; |
65 | |
66 | if (!txt) { |
67 | printk(KERN_WARNING "%s probe: memory squeeze\n", port->name); |
68 | return; |
69 | } |
70 | strcpy(txt, str); |
71 | while (p) { |
72 | char *sep; |
73 | q = strchr(p, ';'); |
74 | if (q) *q = 0; |
75 | sep = strchr(p, ':'); |
76 | if (sep) { |
77 | char *u; |
78 | *(sep++) = 0; |
79 | /* Get rid of trailing blanks */ |
80 | u = sep + strlen (sep) - 1; |
81 | while (u >= p && *u == ' ') |
82 | *u-- = '\0'; |
83 | u = p; |
84 | while (*u) { |
85 | *u = toupper(*u); |
86 | u++; |
87 | } |
88 | if (!strcmp(p, "MFG") || !strcmp(p, "MANUFACTURER")) { |
89 | if (info->mfr) |
90 | kfree (info->mfr); |
91 | info->mfr = strdup(sep); |
92 | } else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) { |
93 | if (info->model) |
94 | kfree (info->model); |
95 | info->model = strdup(sep); |
96 | } else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) { |
97 | int i; |
98 | if (info->class_name) |
99 | kfree (info->class_name); |
100 | info->class_name = strdup(sep); |
101 | for (u = sep; *u; u++) |
102 | *u = toupper(*u); |
103 | for (i = 0; classes[i].token; i++) { |
104 | if (!strcmp(classes[i].token, sep)) { |
105 | info->class = i; |
106 | goto rock_on; |
107 | } |
108 | } |
109 | printk(KERN_WARNING "%s probe: warning, class '%s' not understood.\n", port->name, sep); |
110 | info->class = PARPORT_CLASS_OTHER; |
111 | } else if (!strcmp(p, "CMD") || |
112 | !strcmp(p, "COMMAND SET")) { |
113 | if (info->cmdset) |
114 | kfree (info->cmdset); |
115 | info->cmdset = strdup(sep); |
116 | /* if it speaks printer language, it's |
117 | probably a printer */ |
118 | if (strstr(sep, "PJL") || strstr(sep, "PCL")) |
119 | guessed_class = PARPORT_CLASS_PRINTER; |
120 | } else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) { |
121 | if (info->description) |
122 | kfree (info->description); |
123 | info->description = strdup(sep); |
124 | } |
125 | } |
126 | rock_on: |
127 | if (q) p = q+1; else p=NULL; |
128 | } |
129 | |
130 | /* If the device didn't tell us its class, maybe we have managed to |
131 | guess one from the things it did say. */ |
132 | if (info->class == PARPORT_CLASS_UNSPEC) |
133 | info->class = guessed_class; |
134 | |
135 | pretty_print (port, device); |
136 | |
137 | kfree(txt); |
138 | } |
139 | |
140 | /* Get Std 1284 Device ID. */ |
141 | ssize_t parport_device_id (int devnum, char *buffer, size_t len) |
142 | { |
143 | ssize_t retval = -ENXIO; |
144 | struct pardevice *dev = parport_open (devnum, "Device ID probe", |
145 | NULL, NULL, NULL, 0, NULL); |
146 | if (!dev) |
147 | return -ENXIO; |
148 | |
149 | parport_claim_or_block (dev); |
150 | |
151 | /* Negotiate to compatibility mode, and then to device ID mode. |
152 | * (This is in case we are already in device ID mode.) */ |
153 | parport_negotiate (dev->port, IEEE1284_MODE_COMPAT); |
154 | retval = parport_negotiate (dev->port, |
155 | IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID); |
156 | |
157 | if (!retval) { |
158 | int idlen; |
159 | unsigned char length[2]; |
160 | |
161 | /* First two bytes are MSB,LSB of inclusive length. */ |
162 | retval = parport_read (dev->port, length, 2); |
163 | |
164 | if (retval != 2) goto end_id; |
165 | |
166 | idlen = (length[0] << 8) + length[1] - 2; |
167 | /* |
168 | * Check if the caller-allocated buffer is large enough |
169 | * otherwise bail out or there will be an at least off by one. |
170 | */ |
171 | if (idlen + 1 < len) |
172 | len = idlen; |
173 | else { |
174 | retval = -EINVAL; |
175 | goto out; |
176 | } |
177 | retval = parport_read (dev->port, buffer, len); |
178 | |
179 | if (retval != len) |
180 | printk (KERN_DEBUG "%s: only read %Zd of %Zd ID bytes\n", |
181 | dev->port->name, retval, |
182 | len); |
183 | |
184 | /* Some printer manufacturers mistakenly believe that |
185 | the length field is supposed to be _exclusive_. |
186 | In addition, there are broken devices out there |
187 | that don't even finish off with a semi-colon. */ |
188 | if (buffer[len - 1] != ';') { |
189 | ssize_t diff; |
190 | diff = parport_read (dev->port, buffer + len, 2); |
191 | retval += diff; |
192 | |
193 | if (diff) |
194 | printk (KERN_DEBUG |
195 | "%s: device reported incorrect " |
196 | "length field (%d, should be %Zd)\n", |
197 | dev->port->name, idlen, retval); |
198 | else { |
199 | /* One semi-colon short of a device ID. */ |
200 | buffer[len++] = ';'; |
201 | printk (KERN_DEBUG "%s: faking semi-colon\n", |
202 | dev->port->name); |
203 | |
204 | /* If we get here, I don't think we |
205 | need to worry about the possible |
206 | standard violation of having read |
207 | more than we were told to. The |
208 | device is non-compliant anyhow. */ |
209 | } |
210 | } |
211 | |
212 | end_id: |
213 | buffer[len] = '\0'; |
214 | parport_negotiate (dev->port, IEEE1284_MODE_COMPAT); |
215 | } |
216 | |
217 | if (retval > 2) |
218 | parse_data (dev->port, dev->daisy, buffer); |
219 | |
220 | out: |
221 | parport_release (dev); |
222 | parport_close (dev); |
223 | return retval; |
224 | } |