293 lines
7.3 KiB
C
293 lines
7.3 KiB
C
/*
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* /proc/bus/pnp interface for Plug and Play devices
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*
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* Written by David Hinds, dahinds@users.sourceforge.net
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* Modified by Thomas Hood
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*
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* The .../devices and .../<node> and .../boot/<node> files are
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* utilized by the lspnp and setpnp utilities, supplied with the
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* pcmcia-cs package.
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* http://pcmcia-cs.sourceforge.net
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*
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* The .../escd file is utilized by the lsescd utility written by
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* Gunther Mayer.
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* http://home.t-online.de/home/gunther.mayer/lsescd
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*
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* The .../legacy_device_resources file is not used yet.
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*
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* The other files are human-readable.
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*/
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//#include <pcmcia/config.h>
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//#include <pcmcia/k_compat.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/pnpbios.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include "pnpbios.h"
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static struct proc_dir_entry *proc_pnp = NULL;
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static struct proc_dir_entry *proc_pnp_boot = NULL;
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static int proc_read_pnpconfig(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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{
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struct pnp_isa_config_struc pnps;
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if (pnp_bios_isapnp_config(&pnps))
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return -EIO;
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return snprintf(buf, count,
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"structure_revision %d\n"
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"number_of_CSNs %d\n"
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"ISA_read_data_port 0x%x\n",
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pnps.revision,
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pnps.no_csns,
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pnps.isa_rd_data_port
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);
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}
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static int proc_read_escdinfo(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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{
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struct escd_info_struc escd;
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if (pnp_bios_escd_info(&escd))
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return -EIO;
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return snprintf(buf, count,
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"min_ESCD_write_size %d\n"
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"ESCD_size %d\n"
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"NVRAM_base 0x%x\n",
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escd.min_escd_write_size,
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escd.escd_size,
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escd.nv_storage_base
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);
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}
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#define MAX_SANE_ESCD_SIZE (32*1024)
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static int proc_read_escd(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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{
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struct escd_info_struc escd;
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char *tmpbuf;
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int escd_size, escd_left_to_read, n;
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if (pnp_bios_escd_info(&escd))
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return -EIO;
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/* sanity check */
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if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
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printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n");
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return -EFBIG;
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}
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tmpbuf = kcalloc(1, escd.escd_size, GFP_KERNEL);
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if (!tmpbuf) return -ENOMEM;
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if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
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kfree(tmpbuf);
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return -EIO;
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}
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escd_size = (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1])*256;
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/* sanity check */
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if (escd_size > MAX_SANE_ESCD_SIZE) {
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printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size reported by BIOS read_escd call is too great\n");
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return -EFBIG;
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}
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escd_left_to_read = escd_size - pos;
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if (escd_left_to_read < 0) escd_left_to_read = 0;
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if (escd_left_to_read == 0) *eof = 1;
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n = min(count,escd_left_to_read);
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memcpy(buf, tmpbuf + pos, n);
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kfree(tmpbuf);
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*start = buf;
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return n;
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}
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static int proc_read_legacyres(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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{
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/* Assume that the following won't overflow the buffer */
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if (pnp_bios_get_stat_res(buf))
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return -EIO;
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return count; // FIXME: Return actual length
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}
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static int proc_read_devices(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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{
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struct pnp_bios_node *node;
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u8 nodenum;
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char *p = buf;
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if (pos >= 0xff)
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return 0;
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node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
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if (!node) return -ENOMEM;
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for (nodenum=pos; nodenum<0xff; ) {
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u8 thisnodenum = nodenum;
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/* 26 = the number of characters per line sprintf'ed */
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if ((p - buf + 26) > count)
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break;
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if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
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break;
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p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
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node->handle, node->eisa_id,
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node->type_code[0], node->type_code[1],
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node->type_code[2], node->flags);
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if (nodenum <= thisnodenum) {
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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);
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*eof = 1;
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break;
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}
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}
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kfree(node);
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if (nodenum == 0xff)
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*eof = 1;
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*start = (char *)((off_t)nodenum - pos);
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return p - buf;
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}
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static int proc_read_node(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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{
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struct pnp_bios_node *node;
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int boot = (long)data >> 8;
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u8 nodenum = (long)data;
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int len;
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node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
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if (!node) return -ENOMEM;
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if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
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kfree(node);
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return -EIO;
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}
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len = node->size - sizeof(struct pnp_bios_node);
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memcpy(buf, node->data, len);
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kfree(node);
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return len;
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}
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static int proc_write_node(struct file *file, const char __user *buf,
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unsigned long count, void *data)
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{
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struct pnp_bios_node *node;
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int boot = (long)data >> 8;
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u8 nodenum = (long)data;
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int ret = count;
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node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
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if (!node)
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return -ENOMEM;
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if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
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ret = -EIO;
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goto out;
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}
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if (count != node->size - sizeof(struct pnp_bios_node)) {
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ret = -EINVAL;
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goto out;
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}
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if (copy_from_user(node->data, buf, count)) {
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ret = -EFAULT;
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goto out;
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}
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if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
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ret = -EINVAL;
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goto out;
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}
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ret = count;
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out:
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kfree(node);
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return ret;
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}
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int pnpbios_interface_attach_device(struct pnp_bios_node * node)
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{
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char name[3];
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struct proc_dir_entry *ent;
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sprintf(name, "%02x", node->handle);
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if (!proc_pnp)
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return -EIO;
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if ( !pnpbios_dont_use_current_config ) {
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ent = create_proc_entry(name, 0, proc_pnp);
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if (ent) {
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ent->read_proc = proc_read_node;
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ent->write_proc = proc_write_node;
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ent->data = (void *)(long)(node->handle);
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}
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}
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if (!proc_pnp_boot)
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return -EIO;
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ent = create_proc_entry(name, 0, proc_pnp_boot);
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if (ent) {
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ent->read_proc = proc_read_node;
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ent->write_proc = proc_write_node;
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ent->data = (void *)(long)(node->handle+0x100);
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return 0;
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}
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return -EIO;
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}
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/*
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* When this is called, pnpbios functions are assumed to
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* work and the pnpbios_dont_use_current_config flag
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* should already have been set to the appropriate value
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*/
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int __init pnpbios_proc_init( void )
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{
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proc_pnp = proc_mkdir("pnp", proc_bus);
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if (!proc_pnp)
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return -EIO;
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proc_pnp_boot = proc_mkdir("boot", proc_pnp);
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if (!proc_pnp_boot)
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return -EIO;
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create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
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create_proc_read_entry("configuration_info", 0, proc_pnp, proc_read_pnpconfig, NULL);
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create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo, NULL);
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create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL);
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create_proc_read_entry("legacy_device_resources", 0, proc_pnp, proc_read_legacyres, NULL);
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return 0;
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}
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void __exit pnpbios_proc_exit(void)
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{
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int i;
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char name[3];
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if (!proc_pnp)
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return;
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for (i=0; i<0xff; i++) {
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sprintf(name, "%02x", i);
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if ( !pnpbios_dont_use_current_config )
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remove_proc_entry(name, proc_pnp);
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remove_proc_entry(name, proc_pnp_boot);
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}
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remove_proc_entry("legacy_device_resources", proc_pnp);
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remove_proc_entry("escd", proc_pnp);
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remove_proc_entry("escd_info", proc_pnp);
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remove_proc_entry("configuration_info", proc_pnp);
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remove_proc_entry("devices", proc_pnp);
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remove_proc_entry("boot", proc_pnp);
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remove_proc_entry("pnp", proc_bus);
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return;
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}
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