Merge branch 'linus' into x86/asm
[firefly-linux-kernel-4.4.55.git] / 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 #include <linux/mutex.h>
9
10 #include <asm/unaligned.h>
11
12 #include <scsi/scsi_ioctl.h>
13
14 #include "ide-floppy.h"
15
16 /*
17  * Obtain the list of formattable capacities.
18  * Very similar to ide_floppy_get_capacity, except that we push the capacity
19  * descriptors to userland, instead of our own structures.
20  *
21  * Userland gives us the following structure:
22  *
23  * struct idefloppy_format_capacities {
24  *      int nformats;
25  *      struct {
26  *              int nblocks;
27  *              int blocksize;
28  *      } formats[];
29  * };
30  *
31  * userland initializes nformats to the number of allocated formats[] records.
32  * On exit we set nformats to the number of records we've actually initialized.
33  */
34
35 static DEFINE_MUTEX(ide_floppy_ioctl_mutex);
36 static int ide_floppy_get_format_capacities(ide_drive_t *drive,
37                                             struct ide_atapi_pc *pc,
38                                             int __user *arg)
39 {
40         struct ide_disk_obj *floppy = drive->driver_data;
41         int i, blocks, length, u_array_size, u_index;
42         int __user *argp;
43         u8 pc_buf[256], header_len, desc_cnt;
44
45         if (get_user(u_array_size, arg))
46                 return -EFAULT;
47
48         if (u_array_size <= 0)
49                 return -EINVAL;
50
51         ide_floppy_create_read_capacity_cmd(pc);
52
53         if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
54                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
55                 return -EIO;
56         }
57
58         header_len = pc_buf[3];
59         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
60
61         u_index = 0;
62         argp = arg + 1;
63
64         /*
65          * We always skip the first capacity descriptor.  That's the current
66          * capacity.  We are interested in the remaining descriptors, the
67          * formattable capacities.
68          */
69         for (i = 1; i < desc_cnt; i++) {
70                 unsigned int desc_start = 4 + i*8;
71
72                 if (u_index >= u_array_size)
73                         break;  /* User-supplied buffer too small */
74
75                 blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
76                 length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
77
78                 if (put_user(blocks, argp))
79                         return -EFAULT;
80
81                 ++argp;
82
83                 if (put_user(length, argp))
84                         return -EFAULT;
85
86                 ++argp;
87
88                 ++u_index;
89         }
90
91         if (put_user(u_index, arg))
92                 return -EFAULT;
93
94         return 0;
95 }
96
97 static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc,
98                                               u8 *buf, int b, int l,
99                                               int flags)
100 {
101         ide_init_pc(pc);
102         pc->c[0] = GPCMD_FORMAT_UNIT;
103         pc->c[1] = 0x17;
104
105         memset(buf, 0, 12);
106         buf[1] = 0xA2;
107         /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
108
109         if (flags & 1)                          /* Verify bit on... */
110                 buf[1] ^= 0x20;                 /* ... turn off DCRT bit */
111         buf[3] = 8;
112
113         put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
114         put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
115         pc->req_xfer = 12;
116         pc->flags |= PC_FLAG_WRITING;
117 }
118
119 static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
120 {
121         struct ide_disk_obj *floppy = drive->driver_data;
122         u8 buf[20];
123
124         drive->atapi_flags &= ~IDE_AFLAG_SRFP;
125
126         ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
127         pc->flags |= PC_FLAG_SUPPRESS_ERROR;
128
129         if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
130                 return 1;
131
132         if (buf[8 + 2] & 0x40)
133                 drive->atapi_flags |= IDE_AFLAG_SRFP;
134
135         return 0;
136 }
137
138 static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
139                                   int __user *arg)
140 {
141         struct ide_disk_obj *floppy = drive->driver_data;
142         u8 buf[12];
143         int blocks, length, flags, err = 0;
144
145         if (floppy->openers > 1) {
146                 /* Don't format if someone is using the disk */
147                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
148                 return -EBUSY;
149         }
150
151         drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS;
152
153         /*
154          * Send ATAPI_FORMAT_UNIT to the drive.
155          *
156          * Userland gives us the following structure:
157          *
158          * struct idefloppy_format_command {
159          *        int nblocks;
160          *        int blocksize;
161          *        int flags;
162          *        } ;
163          *
164          * flags is a bitmask, currently, the only defined flag is:
165          *
166          *        0x01 - verify media after format.
167          */
168         if (get_user(blocks, arg) ||
169                         get_user(length, arg+1) ||
170                         get_user(flags, arg+2)) {
171                 err = -EFAULT;
172                 goto out;
173         }
174
175         ide_floppy_get_sfrp_bit(drive, pc);
176         ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);
177
178         if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
179                 err = -EIO;
180
181 out:
182         if (err)
183                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
184         return err;
185 }
186
187 /*
188  * Get ATAPI_FORMAT_UNIT progress indication.
189  *
190  * Userland gives a pointer to an int.  The int is set to a progress
191  * indicator 0-65536, with 65536=100%.
192  *
193  * If the drive does not support format progress indication, we just check
194  * the dsc bit, and return either 0 or 65536.
195  */
196
197 static int ide_floppy_get_format_progress(ide_drive_t *drive,
198                                           struct ide_atapi_pc *pc,
199                                           int __user *arg)
200 {
201         struct ide_disk_obj *floppy = drive->driver_data;
202         u8 sense_buf[18];
203         int progress_indication = 0x10000;
204
205         if (drive->atapi_flags & IDE_AFLAG_SRFP) {
206                 ide_create_request_sense_cmd(drive, pc);
207                 if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf,
208                                       pc->req_xfer))
209                         return -EIO;
210
211                 if (floppy->sense_key == 2 &&
212                     floppy->asc == 4 &&
213                     floppy->ascq == 4)
214                         progress_indication = floppy->progress_indication;
215
216                 /* Else assume format_unit has finished, and we're at 0x10000 */
217         } else {
218                 ide_hwif_t *hwif = drive->hwif;
219                 unsigned long flags;
220                 u8 stat;
221
222                 local_irq_save(flags);
223                 stat = hwif->tp_ops->read_status(hwif);
224                 local_irq_restore(flags);
225
226                 progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
227         }
228
229         if (put_user(progress_indication, arg))
230                 return -EFAULT;
231
232         return 0;
233 }
234
235 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
236                                unsigned long arg, unsigned int cmd)
237 {
238         struct ide_disk_obj *floppy = drive->driver_data;
239         struct gendisk *disk = floppy->disk;
240         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
241
242         if (floppy->openers > 1)
243                 return -EBUSY;
244
245         ide_set_media_lock(drive, disk, prevent);
246
247         if (cmd == CDROMEJECT)
248                 ide_do_start_stop(drive, disk, 2);
249
250         return 0;
251 }
252
253 static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc,
254                                    fmode_t mode, unsigned int cmd,
255                                    void __user *argp)
256 {
257         switch (cmd) {
258         case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
259                 return 0;
260         case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
261                 return ide_floppy_get_format_capacities(drive, pc, argp);
262         case IDEFLOPPY_IOCTL_FORMAT_START:
263                 if (!(mode & FMODE_WRITE))
264                         return -EPERM;
265                 return ide_floppy_format_unit(drive, pc, (int __user *)argp);
266         case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
267                 return ide_floppy_get_format_progress(drive, pc, argp);
268         default:
269                 return -ENOTTY;
270         }
271 }
272
273 int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
274                      fmode_t mode, unsigned int cmd, unsigned long arg)
275 {
276         struct ide_atapi_pc pc;
277         void __user *argp = (void __user *)arg;
278         int err;
279
280         mutex_lock(&ide_floppy_ioctl_mutex);
281         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
282                 err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
283                 goto out;
284         }
285
286         err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
287         if (err != -ENOTTY)
288                 goto out;
289
290         /*
291          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
292          * and CDROM_SEND_PACKET (legacy) ioctls
293          */
294         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
295                 err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
296
297         if (err == -ENOTTY)
298                 err = generic_ide_ioctl(drive, bdev, cmd, arg);
299
300 out:
301         mutex_unlock(&ide_floppy_ioctl_mutex);
302         return err;
303 }