[PATCH] pnpbios driver update.

Update from Thomas..

Here are the additional bits from the -ac tree, diffed
against 2.5.6 + 2.5.5-dj3 patch.  The changes include:

- Improve some comments
- Postpone starting the kernel thread (Alan Cox)
- Call kernel thread 'kpnpbiosd' instead of 'kpnpbios'
- Consolidate printing of error messages to save space
- Add __init and __exit tags and return appropriate error codes
- Print slightly more consistent messages
- Get closer to supporting build-as-module

drivers/pnp/pnpbios_proc.c

 /*
- * pnp_proc.c: /proc/bus/pnp interface for Plug and Play devices
+ * /proc/bus/pnp interface for Plug and Play devices
  *
  * Written by David Hinds, dahinds@users.sourceforge.net
+ * Modified by Thomas Hood, jdthood@mail.com
+ *
+ * The .../devices and .../<node> and .../boot/<node> files are
+ * utilized by the lspnp and setpnp utilities, supplied with the
+ * pcmcia-cs package.
+ *     http://pcmcia-cs.sourceforge.net
+ *
+ * The .../escd file is utilized by the lsescd utility written by
+ * Gunther Mayer.
+ *     http://home.t-online.de/home/gunther.mayer/lsescd
+ *
+ * The .../legacy_device_resources file is not used yet.
+ *
+ * The other files are human-readable.
  */
 
 //#include <pcmcia/config.h>
@@ -19,30 +33,118 @@ static struct proc_dir_entry *proc_pnp = NULL;
 static struct proc_dir_entry *proc_pnp_boot = NULL;
 static struct pnp_dev_node_info node_info;
 
+static int proc_read_pnpconfig(char *buf, char **start, off_t pos,
+                               int count, int *eof, void *data)
+{
+	struct pnp_isa_config_struc pnps;
+
+	if (pnp_bios_isapnp_config(&pnps))
+		return -EIO;
+	return snprintf(buf, count,
+		"structure_revision %d\n"
+		"number_of_CSNs %d\n"
+		"ISA_read_data_port 0x%x\n",
+		pnps.revision,
+		pnps.no_csns,
+		pnps.isa_rd_data_port
+	);
+}
+
+static int proc_read_escdinfo(char *buf, char **start, off_t pos,
+                              int count, int *eof, void *data)
+{
+	struct escd_info_struc escd;
+
+	if (pnp_bios_escd_info(&escd))
+		return -EIO;
+	return snprintf(buf, count,
+		"min_ESCD_write_size %d\n"
+		"ESCD_size %d\n"
+		"NVRAM_base 0x%x\n",
+		escd.min_escd_write_size,
+		escd.escd_size,
+		escd.nv_storage_base
+	);
+}
+
+static int proc_read_escd(char *buf, char **start, off_t pos,
+                          int count, int *eof, void *data)
+{
+	struct escd_info_struc escd;
+	char *tmpbuf;
+	int escd_size, escd_left_to_read, n;
+
+	if (pnp_bios_escd_info(&escd))
+		return -EIO;
+
+	/* sanity check */
+	if (escd.escd_size > (32*1024)) {
+		printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size is too great\n");
+		return -EFBIG;
+	}
+
+	tmpbuf = pnpbios_kmalloc(escd.escd_size, GFP_KERNEL);
+	if (!tmpbuf) return -ENOMEM;
+
+	if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base))
+		return -EIO;
+
+	escd_size = (unsigned char)(buf[0]) + (unsigned char)(buf[1])*256;
+	escd_left_to_read = escd_size - pos;
+	if (escd_left_to_read < 0) escd_left_to_read = 0;
+	if (escd_left_to_read == 0) *eof = 1;
+	n = min(count,escd_left_to_read);
+	memcpy(buf, tmpbuf + pos, n);
+	kfree(tmpbuf);
+	*start = buf;
+	return n;
+}
+
+static int proc_read_legacyres(char *buf, char **start, off_t pos,
+                               int count, int *eof, void *data)
+{
+	/* Assume that the following won't overflow the buffer */
+	if (pnp_bios_get_stat_res(buf)) 
+		return -EIO;
+
+	return count;  // FIXME: Return actual length
+}
+
 static int proc_read_devices(char *buf, char **start, off_t pos,
                              int count, int *eof, void *data)
 {
 	struct pnp_bios_node *node;
-	int i;
 	u8 nodenum;
 	char *p = buf;
 
-	if (pos != 0) {
-	    *eof = 1;
+	if (pos >= 0xff)
 		return 0;
-	}
+
 	node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
 	if (!node) return -ENOMEM;
-	for (i=0,nodenum=0;i<0xff && nodenum!=0xff; i++) {
-		if ( pnp_bios_get_dev_node(&nodenum, 1, node) )
+
+	for (nodenum=pos; nodenum<0xff; ) {
+		u8 thisnodenum = nodenum;
+		/* 26 = the number of characters per line sprintf'ed */
+		if ((p - buf + 26) > count)
+			break;
+		if (pnp_bios_get_dev_node(&nodenum, 1, node))
 			break;
 		p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
 			     node->handle, node->eisa_id,
 			     node->type_code[0], node->type_code[1],
 			     node->type_code[2], node->flags);
+		if (nodenum <= thisnodenum) {
+			printk(KERN_ERR "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", "PnPBIOS: proc_read_devices:", (unsigned int)nodenum, (unsigned int)thisnodenum);
+			*eof = 1;
+			break;
+		}
 	}
 	kfree(node);
-	return (p-buf);
+	if (nodenum == 0xff)
+		*eof = 1;
+	*start = (char *)((off_t)nodenum - pos);
+	return p - buf;
 }
 
 static int proc_read_node(char *buf, char **start, off_t pos,
@@ -53,13 +155,9 @@ static int proc_read_node(char *buf, char **start, off_t pos,
 	u8 nodenum = (long)data;
 	int len;
 
-	if (pos != 0) {
-	    *eof = 1;
-	    return 0;
-	}
 	node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
 	if (!node) return -ENOMEM;
-	if ( pnp_bios_get_dev_node(&nodenum, boot, node) )
+	if (pnp_bios_get_dev_node(&nodenum, boot, node))
 		return -EIO;
 	len = node->size - sizeof(struct pnp_bios_node);
 	memcpy(buf, node->data, len);
@@ -92,25 +190,34 @@ static int proc_write_node(struct file *file, const char *buf,
  * work and the pnpbios_dont_use_current_config flag
  * should already have been set to the appropriate value
  */
-void pnpbios_proc_init( void )
+int __init pnpbios_proc_init( void )
 {
 	struct pnp_bios_node *node;
 	struct proc_dir_entry *ent;
 	char name[3];
-	int i;
 	u8 nodenum;
 
-	if (pnp_bios_dev_node_info(&node_info) != 0) return;
+	if (pnp_bios_dev_node_info(&node_info))
+		return -EIO;
 	
 	proc_pnp = proc_mkdir("pnp", proc_bus);
-	if (!proc_pnp) return;
+	if (!proc_pnp)
+		return -EIO;
 	proc_pnp_boot = proc_mkdir("boot", proc_pnp);
-	if (!proc_pnp_boot) return;
+	if (!proc_pnp_boot)
+		return -EIO;
 	create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
+	create_proc_read_entry("configuration_info", 0, proc_pnp, proc_read_pnpconfig, NULL);
+	create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo, NULL);
+	create_proc_read_entry("escd", 0, proc_pnp, proc_read_escd, NULL);
+	create_proc_read_entry("legacy_device_resources", 0, proc_pnp, proc_read_legacyres, NULL);
 	
 	node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
-	if (!node) return;
-	for (i=0,nodenum = 0; i<0xff && nodenum != 0xff; i++) {
+	if (!node)
+		return -ENOMEM;
+
+	for (nodenum=0; nodenum<0xff; ) {
+		u8 thisnodenum = nodenum;
 		if (pnp_bios_get_dev_node(&nodenum, 1, node) != 0)
 			break;
 		sprintf(name, "%02x", node->handle);
@@ -128,11 +235,17 @@ void pnpbios_proc_init( void )
 			ent->write_proc = proc_write_node;
 			ent->data = (void *)(long)(node->handle+0x100);
 		}
+		if (nodenum <= thisnodenum) {
+			printk(KERN_ERR "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", "PnPBIOS: proc_init:", (unsigned int)nodenum, (unsigned int)thisnodenum);
+			break;
+		}
 	}
 	kfree(node);
+
+	return 0;
 }
 
-void pnpbios_proc_done(void)
+void __exit pnpbios_proc_exit(void)
 {
 	int i;
 	char name[3];
@@ -145,7 +258,13 @@ void pnpbios_proc_done(void)
 			remove_proc_entry(name, proc_pnp);
 		remove_proc_entry(name, proc_pnp_boot);
 	}
-	remove_proc_entry("boot", proc_pnp);
+	remove_proc_entry("legacy_device_resources", proc_pnp);
+	remove_proc_entry("escd", proc_pnp);
+	remove_proc_entry("escd_info", proc_pnp);
+	remove_proc_entry("configuration_info", proc_pnp);
 	remove_proc_entry("devices", proc_pnp);
+	remove_proc_entry("boot", proc_pnp);
 	remove_proc_entry("pnp", proc_bus);
+
+	return;
 }

include/linux/pnpbios.h

@@ -143,20 +143,21 @@ static __inline struct pnpbios_driver *pnpbios_dev_driver(const struct pci_dev *
 extern int  pnpbios_dont_use_current_config;
 extern void *pnpbios_kmalloc(size_t size, int f);
 extern int pnpbios_init (void);
-extern void pnpbios_proc_init (void);
+extern int pnpbios_proc_init (void);
+extern void pnpbios_proc_exit (void);
 
 extern int pnp_bios_dev_node_info (struct pnp_dev_node_info *data);
 extern int pnp_bios_get_dev_node (u8 *nodenum, char config, struct pnp_bios_node *data);
 extern int pnp_bios_set_dev_node (u8 nodenum, char config, struct pnp_bios_node *data);
+extern int pnp_bios_get_stat_res (char *info);
+extern int pnp_bios_isapnp_config (struct pnp_isa_config_struc *data);
+extern int pnp_bios_escd_info (struct escd_info_struc *data);
+extern int pnp_bios_read_escd (char *data, u32 nvram_base);
 #if needed
 extern int pnp_bios_get_event (u16 *message);
 extern int pnp_bios_send_message (u16 message);
 extern int pnp_bios_set_stat_res (char *info);
-extern int pnp_bios_get_stat_res (char *info);
 extern int pnp_bios_apm_id_table (char *table, u16 *size);
-extern int pnp_bios_isapnp_config (struct pnp_isa_config_struc *data);
-extern int pnp_bios_escd_info (struct escd_info_struc *data);
-extern int pnp_bios_read_escd (char *data, u32 nvram_base);
 extern int pnp_bios_write_escd (char *data, u32 nvram_base);
 #endif