eisa_eeprom.c 2.7 KB

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  1. /*
  2. * EISA "eeprom" support routines
  3. *
  4. * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
  5. *
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License as published by
  9. * the Free Software Foundation; either version 2 of the License, or
  10. * (at your option) any later version.
  11. *
  12. * This program is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15. * GNU General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU General Public License
  18. * along with this program; if not, write to the Free Software
  19. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20. */
  21. #include <linux/module.h>
  22. #include <linux/init.h>
  23. #include <linux/kernel.h>
  24. #include <linux/miscdevice.h>
  25. #include <linux/slab.h>
  26. #include <linux/fs.h>
  27. #include <asm/io.h>
  28. #include <asm/uaccess.h>
  29. #include <asm/eisa_eeprom.h>
  30. #define EISA_EEPROM_MINOR 241
  31. static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin)
  32. {
  33. return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
  34. }
  35. static ssize_t eisa_eeprom_read(struct file * file,
  36. char __user *buf, size_t count, loff_t *ppos )
  37. {
  38. unsigned char *tmp;
  39. ssize_t ret;
  40. int i;
  41. if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
  42. return 0;
  43. count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
  44. tmp = kmalloc(count, GFP_KERNEL);
  45. if (tmp) {
  46. for (i = 0; i < count; i++)
  47. tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
  48. if (copy_to_user (buf, tmp, count))
  49. ret = -EFAULT;
  50. else
  51. ret = count;
  52. kfree (tmp);
  53. } else
  54. ret = -ENOMEM;
  55. return ret;
  56. }
  57. static int eisa_eeprom_open(struct inode *inode, struct file *file)
  58. {
  59. if (file->f_mode & FMODE_WRITE)
  60. return -EINVAL;
  61. return 0;
  62. }
  63. static int eisa_eeprom_release(struct inode *inode, struct file *file)
  64. {
  65. return 0;
  66. }
  67. /*
  68. * The various file operations we support.
  69. */
  70. static const struct file_operations eisa_eeprom_fops = {
  71. .owner = THIS_MODULE,
  72. .llseek = eisa_eeprom_llseek,
  73. .read = eisa_eeprom_read,
  74. .open = eisa_eeprom_open,
  75. .release = eisa_eeprom_release,
  76. };
  77. static struct miscdevice eisa_eeprom_dev = {
  78. EISA_EEPROM_MINOR,
  79. "eisa_eeprom",
  80. &eisa_eeprom_fops
  81. };
  82. static int __init eisa_eeprom_init(void)
  83. {
  84. int retval;
  85. if (!eisa_eeprom_addr)
  86. return -ENODEV;
  87. retval = misc_register(&eisa_eeprom_dev);
  88. if (retval < 0) {
  89. printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
  90. return retval;
  91. }
  92. printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
  93. return 0;
  94. }
  95. MODULE_LICENSE("GPL");
  96. module_init(eisa_eeprom_init);