patch-2.3.12 linux/drivers/parport/probe.c

• Lines: 211
• Date: Wed Jul 28 11:22:46 1999
• Orig file: v2.3.11/linux/drivers/parport/probe.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.11/linux/drivers/parport/probe.c linux/drivers/parport/probe.c
@@ -0,0 +1,210 @@
+/* $Id: parport_probe.c,v 1.1 1999/07/03 08:56:17 davem Exp $
+ * Parallel port device probing code
+ *
+ * Authors:    Carsten Gross, carsten@sol.wohnheim.uni-ulm.de
+ *             Philip Blundell <Philip.Blundell@pobox.com>
+ */
+
+#include <linux/parport.h>
+#include <linux/ctype.h>
+#include <asm/uaccess.h>
+
+static struct {
+	char *token;
+	char *descr;
+} classes[] = {
+	{ "",            "Legacy device" },
+	{ "PRINTER",     "Printer" },
+	{ "MODEM",       "Modem" },
+	{ "NET",         "Network device" },
+	{ "HDC",       	 "Hard disk" },
+	{ "PCMCIA",      "PCMCIA" },
+	{ "MEDIA",       "Multimedia device" },
+	{ "FDC",         "Floppy disk" },
+	{ "PORTS",       "Ports" },
+	{ "SCANNER",     "Scanner" },
+	{ "DIGICAM",     "Digital camera" },
+	{ "",            "Unknown device" },
+	{ "",            "Unspecified" },
+	{ "SCSIADAPTER", "SCSI adapter" },
+	{ NULL,          NULL }
+};
+
+static void pretty_print(struct parport *port, int device)
+{
+	struct parport_device_info *info = &port->probe_info[device + 1];
+
+	printk(KERN_INFO "%s", port->name);
+
+	if (device >= 0)
+		printk (" (addr %d)", device);
+
+	printk (": %s", classes[info->class].descr);
+	if (info->class)
+		printk(", %s %s", info->mfr, info->model);
+
+	printk("\n");
+}
+
+static char *strdup(char *str)
+{
+	int n = strlen(str)+1;
+	char *s = kmalloc(n, GFP_KERNEL);
+	if (!s) return NULL;
+	return strcpy(s, str);
+}
+
+static void parse_data(struct parport *port, int device, char *str)
+{
+	char *txt = kmalloc(strlen(str)+1, GFP_KERNEL);
+	char *p = txt, *q;
+	int guessed_class = PARPORT_CLASS_UNSPEC;
+	struct parport_device_info *info = &port->probe_info[device + 1];
+
+	if (!txt) {
+		printk("%s probe: memory squeeze\n", port->name);
+		return;
+	}
+	strcpy(txt, str);
+	while (p) {
+		char *sep;
+		q = strchr(p, ';');
+		if (q) *q = 0;
+		sep = strchr(p, ':');
+		if (sep) {
+			char *u = p;
+			*(sep++) = 0;
+			while (*u) {
+				*u = toupper(*u);
+				u++;
+			}
+			if (!strcmp(p, "MFG") || !strcmp(p, "MANUFACTURER")) {
+				if (info->mfr)
+					kfree (info->mfr);
+				info->mfr = strdup(sep);
+			} else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) {
+				if (info->model)
+					kfree (info->model);
+				info->model = strdup(sep);
+			} else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) {
+				int i;
+				if (info->class_name)
+					kfree (info->class_name);
+				info->class_name = strdup(sep);
+				for (u = sep; *u; u++)
+					*u = toupper(*u);
+				for (i = 0; classes[i].token; i++) {
+					if (!strcmp(classes[i].token, sep)) {
+						info->class = i;
+						goto rock_on;
+					}
+				}
+				printk(KERN_WARNING "%s probe: warning, class '%s' not understood.\n", port->name, sep);
+				info->class = PARPORT_CLASS_OTHER;
+			} else if (!strcmp(p, "CMD") ||
+				   !strcmp(p, "COMMAND SET")) {
+				if (info->cmdset)
+					kfree (info->cmdset);
+				info->cmdset = strdup(sep);
+				/* if it speaks printer language, it's
+				   probably a printer */
+				if (strstr(sep, "PJL") || strstr(sep, "PCL"))
+					guessed_class = PARPORT_CLASS_PRINTER;
+			} else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) {
+				if (info->description)
+					kfree (info->description);
+				info->description = strdup(sep);
+			}
+		}
+	rock_on:
+		if (q) p = q+1; else p=NULL;
+	}
+
+	/* If the device didn't tell us its class, maybe we have managed to
+	   guess one from the things it did say. */
+	if (info->class == PARPORT_CLASS_UNSPEC)
+		info->class = guessed_class;
+
+	pretty_print (port, device);
+
+	kfree(txt);
+}
+
+/* Get Std 1284 Device ID. */
+ssize_t parport_device_id (int devnum, char *buffer, size_t len)
+{
+	ssize_t retval = -ENXIO;
+	struct pardevice *dev = parport_open (devnum, "Device ID probe",
+					      NULL, NULL, NULL, 0, NULL);
+	if (!dev)
+		return -ENXIO;
+
+	parport_claim_or_block (dev);
+
+	/* Negotiate to compatibility mode, and then to device ID mode.
+	 * (This is in case we are already in device ID mode.) */
+	parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
+	retval = parport_negotiate (dev->port,
+				    IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID);
+
+	if (!retval) {
+		int idlen;
+		unsigned char length[2];
+		mm_segment_t oldfs = get_fs ();
+		set_fs (get_ds ());
+
+		/* First two bytes are MSB,LSB of inclusive length. */
+		retval = parport_read (dev->port, length, 2);
+
+		if (retval != 2) goto restore_fs;
+
+		idlen = (length[0] << 8) + length[1] - 2;
+		if (idlen < len)
+			len = idlen;
+		retval = parport_read (dev->port, buffer, len);
+
+		if (retval != len)
+			printk (KERN_DEBUG "%s: only read %d of %d ID bytes\n",
+				dev->port->name, retval, len);
+
+		/* Some printer manufacturers mistakenly believe that
+                   the length field is supposed to be _exclusive_. */
+		/* In addition, there are broken devices out there
+                   that don't even finish off with a semi-colon. */
+		if (buffer[len - 1] != ';') {
+			ssize_t diff;
+			diff = parport_read (dev->port, buffer + len, 2);
+			retval += diff;
+
+			if (diff)
+				printk (KERN_DEBUG
+					"%s: device reported incorrect "
+					"length field (%d, should be %d)\n",
+					dev->port->name, idlen, retval);
+			else {
+				/* One semi-colon short of a device ID. */
+				buffer[len++] = ';';
+				printk (KERN_DEBUG "%s: faking semi-colon\n",
+					dev->port->name);
+
+				/* If we get here, I don't think we
+                                   need to worry about the possible
+                                   standard violation of having read
+                                   more than we were told to.  The
+                                   device is non-compliant anyhow. */
+			}
+		}
+
+	restore_fs:
+		buffer[len] = '\0';
+		set_fs (oldfs);
+		parport_negotiate (dev->port, IEEE1284_MODE_COMPAT);
+	}
+	parport_release (dev);
+
+	if (retval > 2)
+		parse_data (dev->port, dev->daisy, buffer);
+
+	parport_close (dev);
+	return retval;
+}