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