linux/drivers/pnp/pnpbios/proc.c
Bjorn Helgaas a2822e7f00 [PATCH] pnp: consolidate kmalloc wrappers
ISAPNP, PNPBIOS, and PNPACPI all had their own kmalloc wrappers that
reimplemented kcalloc().  Remove the wrappers and just use kcalloc()
directly.

Note that this also removes the PNPBIOS error message when the kmalloc
fails.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:21 -07:00

292 lines
7.3 KiB
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 = kcalloc(1, 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 = kcalloc(1, 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 = kcalloc(1, 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 = kcalloc(1, 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;
}