drivers/ide/ide-gd-floppy.c

   1 #include <linux/module.h>
   2 #include <linux/types.h>
   3 #include <linux/string.h>
   4 #include <linux/kernel.h>
   5 #include <linux/errno.h>
   6 #include <linux/genhd.h>
   7 #include <linux/mutex.h>
   8 #include <linux/ide.h>
   9 #include <linux/hdreg.h>
  10
  11 #include "ide-floppy.h"
  12
  13 #define IDEFLOPPY_VERSION "1.00"
  14
  15 /* module parameters */
  16 static unsigned long debug_mask;
  17 module_param(debug_mask, ulong, 0644);
  18
  19 static DEFINE_MUTEX(ide_disk_ref_mutex);
  20
  21 static void ide_disk_release(struct kref *);
  22
  23 static struct ide_floppy_obj *ide_disk_get(struct gendisk *disk)
  24 {
  25         struct ide_floppy_obj *idkp = NULL;
  26
  27         mutex_lock(&ide_disk_ref_mutex);
  28         idkp = ide_drv_g(disk, ide_floppy_obj);
  29         if (idkp) {
  30                 if (ide_device_get(idkp->drive))
  31                         idkp = NULL;
  32                 else
  33                         kref_get(&idkp->kref);
  34         }
  35         mutex_unlock(&ide_disk_ref_mutex);
  36         return idkp;
  37 }
  38
  39 static void ide_disk_put(struct ide_floppy_obj *idkp)
  40 {
  41         ide_drive_t *drive = idkp->drive;
  42
  43         mutex_lock(&ide_disk_ref_mutex);
  44         kref_put(&idkp->kref, ide_disk_release);
  45         ide_device_put(drive);
  46         mutex_unlock(&ide_disk_ref_mutex);
  47 }
  48
  49 sector_t ide_gd_capacity(ide_drive_t *drive)
  50 {
  51         return drive->capacity64;
  52 }
  53
  54 static int ide_gd_probe(ide_drive_t *);
  55
  56 static void ide_gd_remove(ide_drive_t *drive)
  57 {
  58         struct ide_floppy_obj *idkp = drive->driver_data;
  59         struct gendisk *g = idkp->disk;
  60
  61         ide_proc_unregister_driver(drive, idkp->driver);
  62
  63         del_gendisk(g);
  64
  65         ide_disk_put(idkp);
  66 }
  67
  68 static void ide_disk_release(struct kref *kref)
  69 {
  70         struct ide_floppy_obj *idkp = to_ide_drv(kref, ide_floppy_obj);
  71         ide_drive_t *drive = idkp->drive;
  72         struct gendisk *g = idkp->disk;
  73
  74         drive->driver_data = NULL;
  75         g->private_data = NULL;
  76         put_disk(g);
  77         kfree(idkp);
  78 }
  79
  80 static ide_driver_t ide_gd_driver = {
  81         .gen_driver = {
  82                 .owner          = THIS_MODULE,
  83                 .name           = "ide-floppy",
  84                 .bus            = &ide_bus_type,
  85         },
  86         .probe                  = ide_gd_probe,
  87         .remove                 = ide_gd_remove,
  88         .version                = IDEFLOPPY_VERSION,
  89         .do_request             = ide_floppy_do_request,
  90         .end_request            = ide_floppy_end_request,
  91         .error                  = __ide_error,
  92 #ifdef CONFIG_IDE_PROC_FS
  93         .proc                   = ide_floppy_proc,
  94         .settings               = ide_floppy_settings,
  95 #endif
  96 };
  97
  98 static int ide_gd_open(struct inode *inode, struct file *filp)
  99 {
 100         struct gendisk *disk = inode->i_bdev->bd_disk;
 101         struct ide_floppy_obj *idkp;
 102         ide_drive_t *drive;
 103         int ret = 0;
 104
 105         idkp = ide_disk_get(disk);
 106         if (idkp == NULL)
 107                 return -ENXIO;
 108
 109         drive = idkp->drive;
 110
 111         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 112
 113         idkp->openers++;
 114
 115         if (idkp->openers == 1) {
 116                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 117                 /* Just in case */
 118
 119                 if (ide_do_test_unit_ready(drive, disk))
 120                         ide_do_start_stop(drive, disk, 1);
 121
 122                 ret = ide_floppy_get_capacity(drive);
 123
 124                 set_capacity(disk, ide_gd_capacity(drive));
 125
 126                 if (ret && (filp->f_flags & O_NDELAY) == 0) {
 127                     /*
 128                      * Allow O_NDELAY to open a drive without a disk, or with an
 129                      * unreadable disk, so that we can get the format capacity
 130                      * of the drive or begin the format - Sam
 131                      */
 132                         ret = -EIO;
 133                         goto out_put_idkp;
 134                 }
 135
 136                 if ((drive->dev_flags & IDE_DFLAG_WP) && (filp->f_mode & 2)) {
 137                         ret = -EROFS;
 138                         goto out_put_idkp;
 139                 }
 140
 141                 ide_set_media_lock(drive, disk, 1);
 142                 drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
 143                 check_disk_change(inode->i_bdev);
 144         } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
 145                 ret = -EBUSY;
 146                 goto out_put_idkp;
 147         }
 148         return 0;
 149
 150 out_put_idkp:
 151         idkp->openers--;
 152         ide_disk_put(idkp);
 153         return ret;
 154 }
 155
 156 static int ide_gd_release(struct inode *inode, struct file *filp)
 157 {
 158         struct gendisk *disk = inode->i_bdev->bd_disk;
 159         struct ide_floppy_obj *idkp = ide_drv_g(disk, ide_floppy_obj);
 160         ide_drive_t *drive = idkp->drive;
 161
 162         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 163
 164         if (idkp->openers == 1) {
 165                 ide_set_media_lock(drive, disk, 0);
 166                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 167         }
 168
 169         idkp->openers--;
 170
 171         ide_disk_put(idkp);
 172
 173         return 0;
 174 }
 175
 176 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 177 {
 178         struct ide_floppy_obj *idkp = ide_drv_g(bdev->bd_disk, ide_floppy_obj);
 179         ide_drive_t *drive = idkp->drive;
 180
 181         geo->heads = drive->bios_head;
 182         geo->sectors = drive->bios_sect;
 183         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
 184         return 0;
 185 }
 186
 187 static int ide_gd_media_changed(struct gendisk *disk)
 188 {
 189         struct ide_floppy_obj *idkp = ide_drv_g(disk, ide_floppy_obj);
 190         ide_drive_t *drive = idkp->drive;
 191         int ret;
 192
 193         /* do not scan partitions twice if this is a removable device */
 194         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
 195                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
 196                 return 0;
 197         }
 198
 199         ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED);
 200         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
 201
 202         return ret;
 203 }
 204
 205 static int ide_gd_revalidate_disk(struct gendisk *disk)
 206 {
 207         struct ide_floppy_obj *idkp = ide_drv_g(disk, ide_floppy_obj);
 208         set_capacity(disk, ide_gd_capacity(idkp->drive));
 209         return 0;
 210 }
 211
 212 static struct block_device_operations ide_gd_ops = {
 213         .owner                  = THIS_MODULE,
 214         .open                   = ide_gd_open,
 215         .release                = ide_gd_release,
 216         .ioctl                  = ide_floppy_ioctl,
 217         .getgeo                 = ide_gd_getgeo,
 218         .media_changed          = ide_gd_media_changed,
 219         .revalidate_disk        = ide_gd_revalidate_disk
 220 };
 221
 222 static int ide_gd_probe(ide_drive_t *drive)
 223 {
 224         struct ide_floppy_obj *idkp;
 225         struct gendisk *g;
 226
 227         if (!strstr("ide-floppy", drive->driver_req))
 228                 goto failed;
 229
 230         if (drive->media != ide_floppy)
 231                 goto failed;
 232
 233         if (!ide_check_atapi_device(drive, DRV_NAME)) {
 234                 printk(KERN_ERR PFX "%s: not supported by this version of "
 235                        DRV_NAME "\n", drive->name);
 236                 goto failed;
 237         }
 238         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
 239         if (!idkp) {
 240                 printk(KERN_ERR PFX "%s: Can't allocate a floppy structure\n",
 241                        drive->name);
 242                 goto failed;
 243         }
 244
 245         g = alloc_disk_node(1 << PARTN_BITS, hwif_to_node(drive->hwif));
 246         if (!g)
 247                 goto out_free_idkp;
 248
 249         ide_init_disk(g, drive);
 250
 251         kref_init(&idkp->kref);
 252
 253         idkp->drive = drive;
 254         idkp->driver = &ide_gd_driver;
 255         idkp->disk = g;
 256
 257         g->private_data = &idkp->driver;
 258
 259         drive->driver_data = idkp;
 260
 261         drive->debug_mask = debug_mask;
 262
 263         ide_floppy_setup(drive);
 264
 265         set_capacity(g, ide_gd_capacity(drive));
 266
 267         g->minors = 1 << PARTN_BITS;
 268         g->driverfs_dev = &drive->gendev;
 269         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
 270                 g->flags = GENHD_FL_REMOVABLE;
 271         g->fops = &ide_gd_ops;
 272         add_disk(g);
 273         return 0;
 274
 275 out_free_idkp:
 276         kfree(idkp);
 277 failed:
 278         return -ENODEV;
 279 }
 280
 281 static int __init ide_gd_init(void)
 282 {
 283         printk(KERN_INFO DRV_NAME " driver " IDEFLOPPY_VERSION "\n");
 284         return driver_register(&ide_gd_driver.gen_driver);
 285 }
 286
 287 static void __exit ide_gd_exit(void)
 288 {
 289         driver_unregister(&ide_gd_driver.gen_driver);
 290 }
 291
 292 MODULE_ALIAS("ide:*m-floppy*");
 293 MODULE_ALIAS("ide-floppy");
 294 module_init(ide_gd_init);
 295 module_exit(ide_gd_exit);
 296 MODULE_LICENSE("GPL");
 297 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");