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| 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 <linux/slab.h> |
| 13 | #include <asm/uaccess.h> |
| 14 | |
| 15 | static const struct { |
| 16 | const char *token; |
| 17 | const char *descr; |
| 18 | } classes[] = { |
| 19 | { "", "Legacy device" }, |
| 20 | { "PRINTER", "Printer" }, |
| 21 | { "MODEM", "Modem" }, |
| 22 | { "NET", "Network device" }, |
| 23 | { "HDC", "Hard disk" }, |
| 24 | { "PCMCIA", "PCMCIA" }, |
| 25 | { "MEDIA", "Multimedia device" }, |
| 26 | { "FDC", "Floppy disk" }, |
| 27 | { "PORTS", "Ports" }, |
| 28 | { "SCANNER", "Scanner" }, |
| 29 | { "DIGICAM", "Digital camera" }, |
| 30 | { "", "Unknown device" }, |
| 31 | { "", "Unspecified" }, |
| 32 | { "SCSIADAPTER", "SCSI adapter" }, |
| 33 | { NULL, NULL } |
| 34 | }; |
| 35 | |
| 36 | static void pretty_print(struct parport *port, int device) |
| 37 | { |
| 38 | struct parport_device_info *info = &port->probe_info[device + 1]; |
| 39 | |
| 40 | printk(KERN_INFO "%s", port->name); |
| 41 | |
| 42 | if (device >= 0) |
| 43 | printk (" (addr %d)", device); |
| 44 | |
| 45 | printk (": %s", classes[info->class].descr); |
| 46 | if (info->class) |
| 47 | printk(", %s %s", info->mfr, info->model); |
| 48 | |
| 49 | printk("\n"); |
| 50 | } |
| 51 | |
| 52 | static void parse_data(struct parport *port, int device, char *str) |
| 53 | { |
| 54 | char *txt = kmalloc(strlen(str)+1, GFP_KERNEL); |
| 55 | char *p = txt, *q; |
| 56 | int guessed_class = PARPORT_CLASS_UNSPEC; |
| 57 | struct parport_device_info *info = &port->probe_info[device + 1]; |
| 58 | |
| 59 | if (!txt) { |
| 60 | printk(KERN_WARNING "%s probe: memory squeeze\n", port->name); |
| 61 | return; |
| 62 | } |
| 63 | strcpy(txt, str); |
| 64 | while (p) { |
| 65 | char *sep; |
| 66 | q = strchr(p, ';'); |
| 67 | if (q) *q = 0; |
| 68 | sep = strchr(p, ':'); |
| 69 | if (sep) { |
| 70 | char *u; |
| 71 | *(sep++) = 0; |
| 72 | /* Get rid of trailing blanks */ |
| 73 | u = sep + strlen (sep) - 1; |
| 74 | while (u >= p && *u == ' ') |
| 75 | *u-- = '\0'; |
| 76 | u = p; |
| 77 | while (*u) { |
| 78 | *u = toupper(*u); |
| 79 | u++; |
| 80 | } |
| 81 | if (!strcmp(p, "MFG") || !strcmp(p, "MANUFACTURER")) { |
| 82 | kfree(info->mfr); |
| 83 | info->mfr = kstrdup(sep, GFP_KERNEL); |
| 84 | } else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) { |
| 85 | kfree(info->model); |
| 86 | info->model = kstrdup(sep, GFP_KERNEL); |
| 87 | } else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) { |
| 88 | int i; |
| 89 | |
| 90 | kfree(info->class_name); |
| 91 | info->class_name = kstrdup(sep, GFP_KERNEL); |
| 92 | for (u = sep; *u; u++) |
| 93 | *u = toupper(*u); |
| 94 | for (i = 0; classes[i].token; i++) { |
| 95 | if (!strcmp(classes[i].token, sep)) { |
| 96 | info->class = i; |
| 97 | goto rock_on; |
| 98 | } |
| 99 | } |
| 100 | printk(KERN_WARNING "%s probe: warning, class '%s' not understood.\n", port->name, sep); |
| 101 | info->class = PARPORT_CLASS_OTHER; |
| 102 | } else if (!strcmp(p, "CMD") || |
| 103 | !strcmp(p, "COMMAND SET")) { |
| 104 | kfree(info->cmdset); |
| 105 | info->cmdset = kstrdup(sep, GFP_KERNEL); |
| 106 | /* if it speaks printer language, it's |
| 107 | probably a printer */ |
| 108 | if (strstr(sep, "PJL") || strstr(sep, "PCL")) |
| 109 | guessed_class = PARPORT_CLASS_PRINTER; |
| 110 | } else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) { |
| 111 | kfree(info->description); |
| 112 | info->description = kstrdup(sep, GFP_KERNEL); |
| 113 | } |
| 114 | } |
| 115 | rock_on: |
| 116 | if (q) |
| 117 | p = q + 1; |
| 118 | else |
| 119 | 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 | /* Read up to count-1 bytes of device id. Terminate buffer with |
| 133 | * '\0'. Buffer begins with two Device ID length bytes as given by |
| 134 | * device. */ |
| 135 | static ssize_t parport_read_device_id (struct parport *port, char *buffer, |
| 136 | size_t count) |
| 137 | { |
| 138 | unsigned char length[2]; |
| 139 | unsigned lelen, belen; |
| 140 | size_t idlens[4]; |
| 141 | unsigned numidlens; |
| 142 | unsigned current_idlen; |
| 143 | ssize_t retval; |
| 144 | size_t len; |
| 145 | |
| 146 | /* First two bytes are MSB,LSB of inclusive length. */ |
| 147 | retval = parport_read (port, length, 2); |
| 148 | |
| 149 | if (retval < 0) |
| 150 | return retval; |
| 151 | if (retval != 2) |
| 152 | return -EIO; |
| 153 | |
| 154 | if (count < 2) |
| 155 | return 0; |
| 156 | memcpy(buffer, length, 2); |
| 157 | len = 2; |
| 158 | |
| 159 | /* Some devices wrongly send LE length, and some send it two |
| 160 | * bytes short. Construct a sorted array of lengths to try. */ |
| 161 | belen = (length[0] << 8) + length[1]; |
| 162 | lelen = (length[1] << 8) + length[0]; |
| 163 | idlens[0] = min(belen, lelen); |
| 164 | idlens[1] = idlens[0]+2; |
| 165 | if (belen != lelen) { |
| 166 | int off = 2; |
| 167 | /* Don't try lengths of 0x100 and 0x200 as 1 and 2 */ |
| 168 | if (idlens[0] <= 2) |
| 169 | off = 0; |
| 170 | idlens[off] = max(belen, lelen); |
| 171 | idlens[off+1] = idlens[off]+2; |
| 172 | numidlens = off+2; |
| 173 | } |
| 174 | else { |
| 175 | /* Some devices don't truly implement Device ID, but |
| 176 | * just return constant nibble forever. This catches |
| 177 | * also those cases. */ |
| 178 | if (idlens[0] == 0 || idlens[0] > 0xFFF) { |
| 179 | printk (KERN_DEBUG "%s: reported broken Device ID" |
| 180 | " length of %#zX bytes\n", |
| 181 | port->name, idlens[0]); |
| 182 | return -EIO; |
| 183 | } |
| 184 | numidlens = 2; |
| 185 | } |
| 186 | |
| 187 | /* Try to respect the given ID length despite all the bugs in |
| 188 | * the ID length. Read according to shortest possible ID |
| 189 | * first. */ |
| 190 | for (current_idlen = 0; current_idlen < numidlens; ++current_idlen) { |
| 191 | size_t idlen = idlens[current_idlen]; |
| 192 | if (idlen+1 >= count) |
| 193 | break; |
| 194 | |
| 195 | retval = parport_read (port, buffer+len, idlen-len); |
| 196 | |
| 197 | if (retval < 0) |
| 198 | return retval; |
| 199 | len += retval; |
| 200 | |
| 201 | if (port->physport->ieee1284.phase != IEEE1284_PH_HBUSY_DAVAIL) { |
| 202 | if (belen != len) { |
| 203 | printk (KERN_DEBUG "%s: Device ID was %zd bytes" |
| 204 | " while device told it would be %d" |
| 205 | " bytes\n", |
| 206 | port->name, len, belen); |
| 207 | } |
| 208 | goto done; |
| 209 | } |
| 210 | |
| 211 | /* This might end reading the Device ID too |
| 212 | * soon. Hopefully the needed fields were already in |
| 213 | * the first 256 bytes or so that we must have read so |
| 214 | * far. */ |
| 215 | if (buffer[len-1] == ';') { |
| 216 | printk (KERN_DEBUG "%s: Device ID reading stopped" |
| 217 | " before device told data not available. " |
| 218 | "Current idlen %u of %u, len bytes %02X %02X\n", |
| 219 | port->name, current_idlen, numidlens, |
| 220 | length[0], length[1]); |
| 221 | goto done; |
| 222 | } |
| 223 | } |
| 224 | if (current_idlen < numidlens) { |
| 225 | /* Buffer not large enough, read to end of buffer. */ |
| 226 | size_t idlen, len2; |
| 227 | if (len+1 < count) { |
| 228 | retval = parport_read (port, buffer+len, count-len-1); |
| 229 | if (retval < 0) |
| 230 | return retval; |
| 231 | len += retval; |
| 232 | } |
| 233 | /* Read the whole ID since some devices would not |
| 234 | * otherwise give back the Device ID from beginning |
| 235 | * next time when asked. */ |
| 236 | idlen = idlens[current_idlen]; |
| 237 | len2 = len; |
| 238 | while(len2 < idlen && retval > 0) { |
| 239 | char tmp[4]; |
| 240 | retval = parport_read (port, tmp, |
| 241 | min(sizeof tmp, idlen-len2)); |
| 242 | if (retval < 0) |
| 243 | return retval; |
| 244 | len2 += retval; |
| 245 | } |
| 246 | } |
| 247 | /* In addition, there are broken devices out there that don't |
| 248 | even finish off with a semi-colon. We do not need to care |
| 249 | about those at this time. */ |
| 250 | done: |
| 251 | buffer[len] = '\0'; |
| 252 | return len; |
| 253 | } |
| 254 | |
| 255 | /* Get Std 1284 Device ID. */ |
| 256 | ssize_t parport_device_id (int devnum, char *buffer, size_t count) |
| 257 | { |
| 258 | ssize_t retval = -ENXIO; |
| 259 | struct pardevice *dev = parport_open (devnum, "Device ID probe"); |
| 260 | if (!dev) |
| 261 | return -ENXIO; |
| 262 | |
| 263 | parport_claim_or_block (dev); |
| 264 | |
| 265 | /* Negotiate to compatibility mode, and then to device ID |
| 266 | * mode. (This so that we start form beginning of device ID if |
| 267 | * already in device ID mode.) */ |
| 268 | parport_negotiate (dev->port, IEEE1284_MODE_COMPAT); |
| 269 | retval = parport_negotiate (dev->port, |
| 270 | IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID); |
| 271 | |
| 272 | if (!retval) { |
| 273 | retval = parport_read_device_id (dev->port, buffer, count); |
| 274 | parport_negotiate (dev->port, IEEE1284_MODE_COMPAT); |
| 275 | if (retval > 2) |
| 276 | parse_data (dev->port, dev->daisy, buffer+2); |
| 277 | } |
| 278 | |
| 279 | parport_release (dev); |
| 280 | parport_close (dev); |
| 281 | return retval; |
| 282 | } |
| 283 |
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