[linux-block.git] / drivers / pnp / pnpbios / proc.c

/*
 * /proc/bus/pnp interface for Plug and Play devices
 *
 * Written by David Hinds, dahinds@users.sourceforge.net
 * Modified by Thomas Hood
 *
 * 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>
//#include <pcmcia/k_compat.h>

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/pnpbios.h>
#include <linux/init.h>

#include <asm/uaccess.h>

#include "pnpbios.h"

static struct proc_dir_entry *proc_pnp = NULL;
static struct proc_dir_entry *proc_pnp_boot = NULL;

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);
}

#define MAX_SANE_ESCD_SIZE (32*1024)
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 > MAX_SANE_ESCD_SIZE) {
		printk(KERN_ERR
		       "PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n");
		return -EFBIG;
	}

	tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
	if (!tmpbuf)
		return -ENOMEM;

	if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
		kfree(tmpbuf);
		return -EIO;
	}

	escd_size =
	    (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;

	/* sanity check */
	if (escd_size > MAX_SANE_ESCD_SIZE) {
		printk(KERN_ERR
		       "PnPBIOS: proc_read_escd: ESCD size reported by BIOS read_escd call is too great\n");
		return -EFBIG;
	}

	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;
	u8 nodenum;
	char *p = buf;

	if (pos >= 0xff)
		return 0;

	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -ENOMEM;

	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, PNPMODE_DYNAMIC, 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);
	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,
			  int count, int *eof, void *data)
{
	struct pnp_bios_node *node;
	int boot = (long)data >> 8;
	u8 nodenum = (long)data;
	int len;

	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -ENOMEM;
	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
		kfree(node);
		return -EIO;
	}
	len = node->size - sizeof(struct pnp_bios_node);
	memcpy(buf, node->data, len);
	kfree(node);
	return len;
}

static int proc_write_node(struct file *file, const char __user * buf,
			   unsigned long count, void *data)
{
	struct pnp_bios_node *node;
	int boot = (long)data >> 8;
	u8 nodenum = (long)data;
	int ret = count;

	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -ENOMEM;
	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
		ret = -EIO;
		goto out;
	}
	if (count != node->size - sizeof(struct pnp_bios_node)) {
		ret = -EINVAL;
		goto out;
	}
	if (copy_from_user(node->data, buf, count)) {
		ret = -EFAULT;
		goto out;
	}
	if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
		ret = -EINVAL;
		goto out;
	}
	ret = count;
      out:
	kfree(node);
	return ret;
}

int pnpbios_interface_attach_device(struct pnp_bios_node *node)
{
	char name[3];
	struct proc_dir_entry *ent;

	sprintf(name, "%02x", node->handle);

	if (!proc_pnp)
		return -EIO;
	if (!pnpbios_dont_use_current_config) {
		ent = create_proc_entry(name, 0, proc_pnp);
		if (ent) {
			ent->read_proc = proc_read_node;
			ent->write_proc = proc_write_node;
			ent->data = (void *)(long)(node->handle);
		}
	}

	if (!proc_pnp_boot)
		return -EIO;
	ent = create_proc_entry(name, 0, proc_pnp_boot);
	if (ent) {
		ent->read_proc = proc_read_node;
		ent->write_proc = proc_write_node;
		ent->data = (void *)(long)(node->handle + 0x100);
		return 0;
	}

	return -EIO;
}

/*
 * When this is called, pnpbios functions are assumed to
 * work and the pnpbios_dont_use_current_config flag
 * should already have been set to the appropriate value
 */
int __init pnpbios_proc_init(void)
{
	proc_pnp = proc_mkdir("pnp", proc_bus);
	if (!proc_pnp)
		return -EIO;
	proc_pnp_boot = proc_mkdir("boot", proc_pnp);
	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", S_IRUSR, proc_pnp, proc_read_escd, NULL);
	create_proc_read_entry("legacy_device_resources", 0, proc_pnp,
			       proc_read_legacyres, NULL);

	return 0;
}

void __exit pnpbios_proc_exit(void)
{
	int i;
	char name[3];

	if (!proc_pnp)
		return;

	for (i = 0; i < 0xff; i++) {
		sprintf(name, "%02x", i);
		if (!pnpbios_dont_use_current_config)
			remove_proc_entry(name, proc_pnp);
		remove_proc_entry(name, proc_pnp_boot);
	}
	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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* /proc/bus/pnp interface for Plug and Play devices
	3	*
	4	* Written by David Hinds, dahinds@users.sourceforge.net
	5	* Modified by Thomas Hood
	6	*
	7	* The .../devices and .../<node> and .../boot/<node> files are
	8	* utilized by the lspnp and setpnp utilities, supplied with the
	9	* pcmcia-cs package.
	10	* http://pcmcia-cs.sourceforge.net
	11	*
	12	* The .../escd file is utilized by the lsescd utility written by
	13	* Gunther Mayer.
	14	* http://home.t-online.de/home/gunther.mayer/lsescd
	15	*
	16	* The .../legacy_device_resources file is not used yet.
	17	*
	18	* The other files are human-readable.
	19	*/
	20
	21	//#include <pcmcia/config.h>
	22	//#include <pcmcia/k_compat.h>
	23
	24	#include <linux/module.h>
	25	#include <linux/kernel.h>
	26	#include <linux/slab.h>
	27	#include <linux/types.h>
	28	#include <linux/proc_fs.h>
	29	#include <linux/pnpbios.h>
	30	#include <linux/init.h>
	31
	32	#include <asm/uaccess.h>
	33
	34	#include "pnpbios.h"
	35
	36	static struct proc_dir_entry *proc_pnp = NULL;
	37	static struct proc_dir_entry *proc_pnp_boot = NULL;
	38
	39	static int proc_read_pnpconfig(char buf, char *start, off_t pos,
9dd78466	40	int count, int eof, void data)
1da177e4 LT	41	{
	42	struct pnp_isa_config_struc pnps;
	43
	44	if (pnp_bios_isapnp_config(&pnps))
	45	return -EIO;
	46	return snprintf(buf, count,
9dd78466 BH	47	"structure_revision %d\n"
	48	"number_of_CSNs %d\n"
	49	"ISA_read_data_port 0x%x\n",
	50	pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
1da177e4 LT	51	}
	52
	53	static int proc_read_escdinfo(char buf, char *start, off_t pos,
9dd78466	54	int count, int eof, void data)
1da177e4 LT	55	{
	56	struct escd_info_struc escd;
	57
	58	if (pnp_bios_escd_info(&escd))
	59	return -EIO;
	60	return snprintf(buf, count,
9dd78466 BH	61	"min_ESCD_write_size %d\n"
	62	"ESCD_size %d\n"
	63	"NVRAM_base 0x%x\n",
	64	escd.min_escd_write_size,
	65	escd.escd_size, escd.nv_storage_base);
1da177e4 LT	66	}
	67
	68	#define MAX_SANE_ESCD_SIZE (32*1024)
	69	static int proc_read_escd(char buf, char *start, off_t pos,
9dd78466	70	int count, int eof, void data)
1da177e4 LT	71	{
	72	struct escd_info_struc escd;
	73	char *tmpbuf;
	74	int escd_size, escd_left_to_read, n;
	75
	76	if (pnp_bios_escd_info(&escd))
	77	return -EIO;
	78
	79	/* sanity check */
	80	if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
9dd78466 BH	81	printk(KERN_ERR
9dd78466 BH	82	"PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n");
1da177e4 LT	83	return -EFBIG;
	84	}
	85
cd861280	86	tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
9dd78466 BH	87	if (!tmpbuf)
9dd78466 BH	88	return -ENOMEM;
1da177e4 LT	89
	90	if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
	91	kfree(tmpbuf);
	92	return -EIO;
	93	}
	94
9dd78466 BH	95	escd_size =
9dd78466 BH	96	(unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
1da177e4 LT	97
	98	/* sanity check */
	99	if (escd_size > MAX_SANE_ESCD_SIZE) {
9dd78466 BH	100	printk(KERN_ERR
9dd78466 BH	101	"PnPBIOS: proc_read_escd: ESCD size reported by BIOS read_escd call is too great\n");
1da177e4 LT	102	return -EFBIG;
	103	}
	104
	105	escd_left_to_read = escd_size - pos;
9dd78466 BH	106	if (escd_left_to_read < 0)
	107	escd_left_to_read = 0;
	108	if (escd_left_to_read == 0)
	109	*eof = 1;
	110	n = min(count, escd_left_to_read);
1da177e4 LT	111	memcpy(buf, tmpbuf + pos, n);
	112	kfree(tmpbuf);
	113	*start = buf;
	114	return n;
	115	}
	116
	117	static int proc_read_legacyres(char buf, char *start, off_t pos,
9dd78466	118	int count, int eof, void data)
1da177e4 LT	119	{
1da177e4 LT	120	/* Assume that the following won't overflow the buffer */
9dd78466	121	if (pnp_bios_get_stat_res(buf))
1da177e4 LT	122	return -EIO;
1da177e4 LT	123
9dd78466	124	return count; // FIXME: Return actual length
1da177e4 LT	125	}
	126
	127	static int proc_read_devices(char buf, char *start, off_t pos,
9dd78466	128	int count, int eof, void data)
1da177e4 LT	129	{
	130	struct pnp_bios_node *node;
	131	u8 nodenum;
	132	char *p = buf;
	133
	134	if (pos >= 0xff)
	135	return 0;
	136
cd861280	137	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
9dd78466 BH	138	if (!node)
9dd78466 BH	139	return -ENOMEM;
1da177e4	140
9dd78466	141	for (nodenum = pos; nodenum < 0xff;) {
1da177e4 LT	142	u8 thisnodenum = nodenum;
	143	/* 26 = the number of characters per line sprintf'ed */
	144	if ((p - buf + 26) > count)
	145	break;
	146	if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
	147	break;
	148	p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
	149	node->handle, node->eisa_id,
	150	node->type_code[0], node->type_code[1],
	151	node->type_code[2], node->flags);
	152	if (nodenum <= thisnodenum) {
9dd78466 BH	153	printk(KERN_ERR
	154	"%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
	155	"PnPBIOS: proc_read_devices:",
	156	(unsigned int)nodenum,
	157	(unsigned int)thisnodenum);
1da177e4 LT	158	*eof = 1;
	159	break;
	160	}
	161	}
	162	kfree(node);
	163	if (nodenum == 0xff)
	164	*eof = 1;
9dd78466	165	start = (char )((off_t) nodenum - pos);
1da177e4 LT	166	return p - buf;
	167	}
	168
	169	static int proc_read_node(char buf, char *start, off_t pos,
9dd78466	170	int count, int eof, void data)
1da177e4 LT	171	{
	172	struct pnp_bios_node *node;
	173	int boot = (long)data >> 8;
	174	u8 nodenum = (long)data;
	175	int len;
	176
cd861280	177	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
9dd78466 BH	178	if (!node)
9dd78466 BH	179	return -ENOMEM;
1da177e4 LT	180	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
	181	kfree(node);
	182	return -EIO;
	183	}
	184	len = node->size - sizeof(struct pnp_bios_node);
	185	memcpy(buf, node->data, len);
	186	kfree(node);
	187	return len;
	188	}
	189
9dd78466 BH	190	static int proc_write_node(struct file file, const char __user buf,
9dd78466 BH	191	unsigned long count, void *data)
1da177e4 LT	192	{
	193	struct pnp_bios_node *node;
	194	int boot = (long)data >> 8;
	195	u8 nodenum = (long)data;
	196	int ret = count;
	197
cd861280	198	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	199	if (!node)
	200	return -ENOMEM;
	201	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
	202	ret = -EIO;
	203	goto out;
	204	}
	205	if (count != node->size - sizeof(struct pnp_bios_node)) {
	206	ret = -EINVAL;
	207	goto out;
	208	}
	209	if (copy_from_user(node->data, buf, count)) {
	210	ret = -EFAULT;
	211	goto out;
	212	}
	213	if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
	214	ret = -EINVAL;
	215	goto out;
	216	}
	217	ret = count;
9dd78466	218	out:
1da177e4 LT	219	kfree(node);
	220	return ret;
	221	}
	222
9dd78466	223	int pnpbios_interface_attach_device(struct pnp_bios_node *node)
1da177e4 LT	224	{
	225	char name[3];
	226	struct proc_dir_entry *ent;
	227
	228	sprintf(name, "%02x", node->handle);
	229
	230	if (!proc_pnp)
	231	return -EIO;
9dd78466	232	if (!pnpbios_dont_use_current_config) {
1da177e4 LT	233	ent = create_proc_entry(name, 0, proc_pnp);
	234	if (ent) {
	235	ent->read_proc = proc_read_node;
	236	ent->write_proc = proc_write_node;
	237	ent->data = (void *)(long)(node->handle);
	238	}
	239	}
	240
	241	if (!proc_pnp_boot)
	242	return -EIO;
	243	ent = create_proc_entry(name, 0, proc_pnp_boot);
	244	if (ent) {
	245	ent->read_proc = proc_read_node;
	246	ent->write_proc = proc_write_node;
9dd78466	247	ent->data = (void *)(long)(node->handle + 0x100);
1da177e4 LT	248	return 0;
	249	}
	250
	251	return -EIO;
	252	}
	253
	254	/*
	255	* When this is called, pnpbios functions are assumed to
	256	* work and the pnpbios_dont_use_current_config flag
	257	* should already have been set to the appropriate value
	258	*/
9dd78466	259	int __init pnpbios_proc_init(void)
1da177e4 LT	260	{
	261	proc_pnp = proc_mkdir("pnp", proc_bus);
	262	if (!proc_pnp)
	263	return -EIO;
	264	proc_pnp_boot = proc_mkdir("boot", proc_pnp);
	265	if (!proc_pnp_boot)
	266	return -EIO;
	267	create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
9dd78466 BH	268	create_proc_read_entry("configuration_info", 0, proc_pnp,
	269	proc_read_pnpconfig, NULL);
	270	create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo,
	271	NULL);
1da177e4	272	create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL);
9dd78466 BH	273	create_proc_read_entry("legacy_device_resources", 0, proc_pnp,
9dd78466 BH	274	proc_read_legacyres, NULL);
1da177e4 LT	275
	276	return 0;
	277	}
	278
	279	void __exit pnpbios_proc_exit(void)
	280	{
	281	int i;
	282	char name[3];
	283
	284	if (!proc_pnp)
	285	return;
	286
9dd78466	287	for (i = 0; i < 0xff; i++) {
1da177e4	288	sprintf(name, "%02x", i);
9dd78466	289	if (!pnpbios_dont_use_current_config)
1da177e4 LT	290	remove_proc_entry(name, proc_pnp);
	291	remove_proc_entry(name, proc_pnp_boot);
	292	}
	293	remove_proc_entry("legacy_device_resources", proc_pnp);
	294	remove_proc_entry("escd", proc_pnp);
	295	remove_proc_entry("escd_info", proc_pnp);
	296	remove_proc_entry("configuration_info", proc_pnp);
	297	remove_proc_entry("devices", proc_pnp);
	298	remove_proc_entry("boot", proc_pnp);
	299	remove_proc_entry("pnp", proc_bus);
	300
	301	return;
	302	}