drivers/ide/ide-generic.c

   1 /*
   2  * generic/default IDE host driver
   3  *
   4  * Copyright (C) 2004, 2008 Bartlomiej Zolnierkiewicz
   5  * This code was split off from ide.c.  See it for original copyrights.
   6  *
   7  * May be copied or modified under the terms of the GNU General Public License.
   8  */
   9
  10 /*
  11  * For special cases new interfaces may be added using sysfs, i.e.
  12  *
  13  *      echo -n "0x168:0x36e:10" > /sys/class/ide_generic/add
  14  *
  15  * will add an interface using I/O ports 0x168-0x16f/0x36e and IRQ 10.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/ide.h>
  22
  23 #define DRV_NAME        "ide_generic"
  24
  25 static ssize_t store_add(struct class *cls, const char *buf, size_t n)
  26 {
  27         ide_hwif_t *hwif;
  28         unsigned int base, ctl;
  29         int irq;
  30         hw_regs_t hw;
  31         u8 idx[] = { 0xff, 0xff, 0xff, 0xff };
  32
  33         if (sscanf(buf, "%x:%x:%d", &base, &ctl, &irq) != 3)
  34                 return -EINVAL;
  35
  36         hwif = ide_find_port();
  37         if (hwif == NULL)
  38                 return -ENOENT;
  39
  40         memset(&hw, 0, sizeof(hw));
  41         ide_std_init_ports(&hw, base, ctl);
  42         hw.irq = irq;
  43         hw.chipset = ide_generic;
  44
  45         ide_init_port_hw(hwif, &hw);
  46
  47         idx[0] = hwif->index;
  48
  49         ide_device_add(idx, NULL);
  50
  51         return n;
  52 };
  53
  54 static struct class_attribute ide_generic_class_attrs[] = {
  55         __ATTR(add, S_IWUSR, NULL, store_add),
  56         __ATTR_NULL
  57 };
  58
  59 static void ide_generic_class_release(struct class *cls)
  60 {
  61         kfree(cls);
  62 }
  63
  64 static int __init ide_generic_sysfs_init(void)
  65 {
  66         struct class *cls;
  67         int rc;
  68
  69         cls = kzalloc(sizeof(*cls), GFP_KERNEL);
  70         if (!cls)
  71                 return -ENOMEM;
  72
  73         cls->name = DRV_NAME;
  74         cls->owner = THIS_MODULE;
  75         cls->class_release = ide_generic_class_release;
  76         cls->class_attrs = ide_generic_class_attrs;
  77
  78         rc = class_register(cls);
  79         if (rc) {
  80                 kfree(cls);
  81                 return rc;
  82         }
  83
  84         return 0;
  85 }
  86
  87 static int __init ide_generic_init(void)
  88 {
  89         u8 idx[MAX_HWIFS];
  90         int i;
  91
  92         for (i = 0; i < MAX_HWIFS; i++) {
  93                 ide_hwif_t *hwif;
  94                 unsigned long io_addr = ide_default_io_base(i);
  95                 hw_regs_t hw;
  96
  97                 idx[i] = 0xff;
  98
  99                 if (io_addr) {
 100                         if (!request_region(io_addr, 8, DRV_NAME)) {
 101                                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX "
 102                                                 "not free.\n",
 103                                                 DRV_NAME, io_addr, io_addr + 7);
 104                                 continue;
 105                         }
 106
 107                         if (!request_region(io_addr + 0x206, 1, DRV_NAME)) {
 108                                 printk(KERN_ERR "%s: I/O resource 0x%lX "
 109                                                 "not free.\n",
 110                                                 DRV_NAME, io_addr + 0x206);
 111                                 release_region(io_addr, 8);
 112                                 continue;
 113                         }
 114
 115                         /*
 116                          * Skip probing if the corresponding
 117                          * slot is already occupied.
 118                          */
 119                         hwif = ide_find_port();
 120                         if (hwif == NULL || hwif->index != i) {
 121                                 idx[i] = 0xff;
 122                                 continue;
 123                         }
 124
 125                         memset(&hw, 0, sizeof(hw));
 126                         ide_std_init_ports(&hw, io_addr, io_addr + 0x206);
 127                         hw.irq = ide_default_irq(io_addr);
 128                         hw.chipset = ide_generic;
 129                         ide_init_port_hw(hwif, &hw);
 130
 131                         idx[i] = i;
 132                 }
 133         }
 134
 135         ide_device_add_all(idx, NULL);
 136
 137         if (ide_generic_sysfs_init())
 138                 printk(KERN_ERR DRV_NAME ": failed to create ide_generic "
 139                                          "class\n");
 140
 141         return 0;
 142 }
 143
 144 module_init(ide_generic_init);
 145
 146 MODULE_LICENSE("GPL");