Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[linux-2.6] / drivers / ide / ide-floppy_ioctl.c
1 /*
2  * ide-floppy IOCTLs handling.
3  */
4
5 #include <linux/kernel.h>
6 #include <linux/ide.h>
7 #include <linux/cdrom.h>
8
9 #include <asm/unaligned.h>
10
11 #include <scsi/scsi_ioctl.h>
12
13 #include "ide-floppy.h"
14
15 /*
16  * Obtain the list of formattable capacities.
17  * Very similar to ide_floppy_get_capacity, except that we push the capacity
18  * descriptors to userland, instead of our own structures.
19  *
20  * Userland gives us the following structure:
21  *
22  * struct idefloppy_format_capacities {
23  *      int nformats;
24  *      struct {
25  *              int nblocks;
26  *              int blocksize;
27  *      } formats[];
28  * };
29  *
30  * userland initializes nformats to the number of allocated formats[] records.
31  * On exit we set nformats to the number of records we've actually initialized.
32  */
33
34 static int ide_floppy_get_format_capacities(ide_drive_t *drive,
35                                             struct ide_atapi_pc *pc,
36                                             int __user *arg)
37 {
38         struct ide_disk_obj *floppy = drive->driver_data;
39         u8 header_len, desc_cnt;
40         int i, blocks, length, u_array_size, u_index;
41         int __user *argp;
42
43         if (get_user(u_array_size, arg))
44                 return -EFAULT;
45
46         if (u_array_size <= 0)
47                 return -EINVAL;
48
49         ide_floppy_create_read_capacity_cmd(pc);
50         if (ide_queue_pc_tail(drive, floppy->disk, pc)) {
51                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
52                 return -EIO;
53         }
54
55         header_len = pc->buf[3];
56         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
57
58         u_index = 0;
59         argp = arg + 1;
60
61         /*
62          * We always skip the first capacity descriptor.  That's the current
63          * capacity.  We are interested in the remaining descriptors, the
64          * formattable capacities.
65          */
66         for (i = 1; i < desc_cnt; i++) {
67                 unsigned int desc_start = 4 + i*8;
68
69                 if (u_index >= u_array_size)
70                         break;  /* User-supplied buffer too small */
71
72                 blocks = be32_to_cpup((__be32 *)&pc->buf[desc_start]);
73                 length = be16_to_cpup((__be16 *)&pc->buf[desc_start + 6]);
74
75                 if (put_user(blocks, argp))
76                         return -EFAULT;
77
78                 ++argp;
79
80                 if (put_user(length, argp))
81                         return -EFAULT;
82
83                 ++argp;
84
85                 ++u_index;
86         }
87
88         if (put_user(u_index, arg))
89                 return -EFAULT;
90
91         return 0;
92 }
93
94 static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
95                 int l, int flags)
96 {
97         ide_init_pc(pc);
98         pc->c[0] = GPCMD_FORMAT_UNIT;
99         pc->c[1] = 0x17;
100
101         memset(pc->buf, 0, 12);
102         pc->buf[1] = 0xA2;
103         /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
104
105         if (flags & 1)                          /* Verify bit on... */
106                 pc->buf[1] ^= 0x20;             /* ... turn off DCRT bit */
107         pc->buf[3] = 8;
108
109         put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
110         put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
111         pc->buf_size = 12;
112         pc->flags |= PC_FLAG_WRITING;
113 }
114
115 static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
116 {
117         struct ide_disk_obj *floppy = drive->driver_data;
118
119         drive->atapi_flags &= ~IDE_AFLAG_SRFP;
120
121         ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
122         pc->flags |= PC_FLAG_SUPPRESS_ERROR;
123
124         if (ide_queue_pc_tail(drive, floppy->disk, pc))
125                 return 1;
126
127         if (pc->buf[8 + 2] & 0x40)
128                 drive->atapi_flags |= IDE_AFLAG_SRFP;
129
130         return 0;
131 }
132
133 static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
134                                   int __user *arg)
135 {
136         struct ide_disk_obj *floppy = drive->driver_data;
137         int blocks, length, flags, err = 0;
138
139         if (floppy->openers > 1) {
140                 /* Don't format if someone is using the disk */
141                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
142                 return -EBUSY;
143         }
144
145         drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS;
146
147         /*
148          * Send ATAPI_FORMAT_UNIT to the drive.
149          *
150          * Userland gives us the following structure:
151          *
152          * struct idefloppy_format_command {
153          *        int nblocks;
154          *        int blocksize;
155          *        int flags;
156          *        } ;
157          *
158          * flags is a bitmask, currently, the only defined flag is:
159          *
160          *        0x01 - verify media after format.
161          */
162         if (get_user(blocks, arg) ||
163                         get_user(length, arg+1) ||
164                         get_user(flags, arg+2)) {
165                 err = -EFAULT;
166                 goto out;
167         }
168
169         ide_floppy_get_sfrp_bit(drive, pc);
170         ide_floppy_create_format_unit_cmd(pc, blocks, length, flags);
171
172         if (ide_queue_pc_tail(drive, floppy->disk, pc))
173                 err = -EIO;
174
175 out:
176         if (err)
177                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
178         return err;
179 }
180
181 /*
182  * Get ATAPI_FORMAT_UNIT progress indication.
183  *
184  * Userland gives a pointer to an int.  The int is set to a progress
185  * indicator 0-65536, with 65536=100%.
186  *
187  * If the drive does not support format progress indication, we just check
188  * the dsc bit, and return either 0 or 65536.
189  */
190
191 static int ide_floppy_get_format_progress(ide_drive_t *drive,
192                                           struct ide_atapi_pc *pc,
193                                           int __user *arg)
194 {
195         struct ide_disk_obj *floppy = drive->driver_data;
196         int progress_indication = 0x10000;
197
198         if (drive->atapi_flags & IDE_AFLAG_SRFP) {
199                 ide_create_request_sense_cmd(drive, pc);
200                 if (ide_queue_pc_tail(drive, floppy->disk, pc))
201                         return -EIO;
202
203                 if (floppy->sense_key == 2 &&
204                     floppy->asc == 4 &&
205                     floppy->ascq == 4)
206                         progress_indication = floppy->progress_indication;
207
208                 /* Else assume format_unit has finished, and we're at 0x10000 */
209         } else {
210                 ide_hwif_t *hwif = drive->hwif;
211                 unsigned long flags;
212                 u8 stat;
213
214                 local_irq_save(flags);
215                 stat = hwif->tp_ops->read_status(hwif);
216                 local_irq_restore(flags);
217
218                 progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
219         }
220
221         if (put_user(progress_indication, arg))
222                 return -EFAULT;
223
224         return 0;
225 }
226
227 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
228                                unsigned long arg, unsigned int cmd)
229 {
230         struct ide_disk_obj *floppy = drive->driver_data;
231         struct gendisk *disk = floppy->disk;
232         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
233
234         if (floppy->openers > 1)
235                 return -EBUSY;
236
237         ide_set_media_lock(drive, disk, prevent);
238
239         if (cmd == CDROMEJECT)
240                 ide_do_start_stop(drive, disk, 2);
241
242         return 0;
243 }
244
245 static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc,
246                                    fmode_t mode, unsigned int cmd,
247                                    void __user *argp)
248 {
249         switch (cmd) {
250         case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
251                 return 0;
252         case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
253                 return ide_floppy_get_format_capacities(drive, pc, argp);
254         case IDEFLOPPY_IOCTL_FORMAT_START:
255                 if (!(mode & FMODE_WRITE))
256                         return -EPERM;
257                 return ide_floppy_format_unit(drive, pc, (int __user *)argp);
258         case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
259                 return ide_floppy_get_format_progress(drive, pc, argp);
260         default:
261                 return -ENOTTY;
262         }
263 }
264
265 int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
266                      fmode_t mode, unsigned int cmd, unsigned long arg)
267 {
268         struct ide_atapi_pc pc;
269         void __user *argp = (void __user *)arg;
270         int err;
271
272         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
273                 return ide_floppy_lockdoor(drive, &pc, arg, cmd);
274
275         err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
276         if (err != -ENOTTY)
277                 return err;
278
279         /*
280          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
281          * and CDROM_SEND_PACKET (legacy) ioctls
282          */
283         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
284                 err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk,
285                                 mode, cmd, argp);
286
287         if (err == -ENOTTY)
288                 err = generic_ide_ioctl(drive, bdev, cmd, arg);
289
290         return err;
291 }