utils/devbios/procfs.c

   1 /*
   2  *                     OpenBIOS - free your system!
   3  *              ( firmware/flash device driver for Linux )
   4  *
   5  *  procfs.c - proc filesystem handling for flash device listing.
   6  *
   7  *  This program is part of a free implementation of the IEEE 1275-1994
   8  *  Standard for Boot (Initialization Configuration) Firmware.
   9  *
  10  *  Copyright (C) 1998-2004  Stefan Reinauer, <stepan@openbios.org>
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; version 2 of the License.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
  24  *
  25  */
  26
  27 #include <linux/config.h>
  28 #include <linux/version.h>
  29 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) && defined(MODVERSIONS)
  30 #include <linux/modversions.h>
  31 #endif
  32 #include <linux/proc_fs.h>
  33
  34 #ifdef CONFIG_PROC_FS
  35 #include "bios.h"
  36 #include "pcisets.h"
  37 #include "flashchips.h"
  38 #include "programming.h"
  39
  40 struct proc_dir_entry *proc_bios;
  41
  42 #define PRINT_PROC(fmt,args...)                                 \
  43         do {                                                    \
  44                 if (!run)                                       \
  45                         break;                                  \
  46                 len += sprintf( buffer+len, fmt, ##args );      \
  47                 if (begin + len > offset + size)                \
  48                         run=0;                                  \
  49                 else if (begin + len < offset) {                \
  50                         begin += len;                           \
  51                         len = 0;                                \
  52                 }                                               \
  53         } while (0)
  54
  55 /*
  56  * ******************************************
  57  *
  58  *      /proc/bios handling
  59  *
  60  * ******************************************
  61  */
  62
  63 #define CFLASH flashdevices[i]
  64 #define FLASH  flashchips[CFLASH.flashnum]
  65 #define MANUF  manufacturers[CFLASH.manufnum]
  66
  67 int bios_read_proc(char *buffer, char **start, off_t offset, int size, int *eof, void *data)
  68 {
  69         int len=0, run=1, i;
  70         off_t begin = 0;
  71
  72         for (i=0;i<flashcount;i++) {
  73 #ifdef DEBUG_PROC
  74                 printk(KERN_DEBUG "BIOS: processing proc info for "
  75                                 "flashchip %d\n",i+1);
  76 #endif
  77                 if (i) /* empty line is seperator between flash chips */
  78                         PRINT_PROC("\n");
  79
  80                 PRINT_PROC("Memory Address  : 0x%08lx\n",
  81                                 (unsigned long)CFLASH.physical);
  82                 PRINT_PROC("Memory Size     : %d kByte\n", CFLASH.size>>10);
  83                 PRINT_PROC("Flash Type      : ");
  84
  85                 if (CFLASH.id == 0) {
  86                         PRINT_PROC("ROM\n");
  87                         continue;
  88                 }
  89
  90                 /* Flash chip completely unknown -> output ID and proceed */
  91                 if (FLASH.id == 0) {
  92                         PRINT_PROC("unknown %s device (id 0x%04x)\n",
  93                                                 MANUF.name, CFLASH.id);
  94                         PRINT_PROC("Supported       : no\n");
  95                         continue;
  96                 }
  97
  98                 PRINT_PROC("%s %s (%dV)\n", MANUF.name,
  99                                 FLASH.name, FLASH.voltage);
 100
 101                 PRINT_PROC("Supported       : %s\n",
 102                                 FLASH.supported ? "yes": "no");
 103 #ifdef DEBUG
 104                 PRINT_PROC("Pagetable       : %d Byte\n", FLASH.pagesize );
 105
 106                 PRINT_PROC("Erase first     : %s\n",
 107                                 FLASH.flags & f_needs_erase ? "yes": "no");
 108
 109                 PRINT_PROC("Intel compliant : %s\n",
 110                                 FLASH.flags & f_intel_compl ? "yes": "no");
 111
 112                 PRINT_PROC("FWH compliant   : %s\n",
 113                                 FLASH.flags & f_fwh_compl ? "yes": "no");
 114
 115                 if (CFLASH.sectors > 1)
 116                         PRINT_PROC("Sectors         : %d\n", CFLASH.sectors);
 117 #endif
 118         }
 119 #ifdef DEBUG_PROC
 120         printk(KERN_DEBUG "BIOS: read_proc done.\n");
 121 #endif
 122         /* set to 1 if we're done */
 123         *eof=run;
 124
 125         if (offset >= begin + len)
 126                 return 0;
 127
 128         *start = buffer + (begin - offset);
 129
 130         return (size < begin + len - offset ? size : begin + len - offset);
 131 }
 132 #undef FLASH
 133 #undef MANUF
 134 #undef CFLASH
 135
 136 #ifdef PROC_WRITEABLE
 137 int bios_write_proc(struct file *file, const char *buffer, unsigned long count, void *data)
 138 {
 139   printk (KERN_INFO "%s\n",buffer);
 140   return count;
 141 }
 142 #endif
 143
 144 int bios_proc_register(void)
 145 {
 146         if ((proc_bios = create_proc_entry("bios", 0, 0))) {
 147                 proc_bios->read_proc = bios_read_proc;
 148 #ifdef PROC_WRITABLE
 149                 proc_bios->write_proc = bios_write_proc;
 150 #endif
 151                 return 0;
 152         }
 153         return 1;
 154 }
 155
 156 int bios_proc_unregister(void)
 157 {
 158         if (proc_bios)
 159                 remove_proc_entry("bios", 0);
 160         return 0;
 161 }
 162 #endif