ide: simplify 'struct ide_taskfile'
[linux-2.6.git] / drivers / ide / ide-ioctls.c
1 /*
2  * IDE ioctls handling.
3  */
4
5 #include <linux/hdreg.h>
6 #include <linux/ide.h>
7
8 static const struct ide_ioctl_devset ide_ioctl_settings[] = {
9 { HDIO_GET_32BIT,        HDIO_SET_32BIT,        &ide_devset_io_32bit  },
10 { HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
11 { HDIO_GET_UNMASKINTR,   HDIO_SET_UNMASKINTR,   &ide_devset_unmaskirq },
12 { HDIO_GET_DMA,          HDIO_SET_DMA,          &ide_devset_using_dma },
13 { -1,                    HDIO_SET_PIO_MODE,     &ide_devset_pio_mode  },
14 { 0 }
15 };
16
17 int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
18                       unsigned int cmd, unsigned long arg,
19                       const struct ide_ioctl_devset *s)
20 {
21         const struct ide_devset *ds;
22         int err = -EOPNOTSUPP;
23
24         for (; (ds = s->setting); s++) {
25                 if (ds->get && s->get_ioctl == cmd)
26                         goto read_val;
27                 else if (ds->set && s->set_ioctl == cmd)
28                         goto set_val;
29         }
30
31         return err;
32
33 read_val:
34         mutex_lock(&ide_setting_mtx);
35         err = ds->get(drive);
36         mutex_unlock(&ide_setting_mtx);
37         return err >= 0 ? put_user(err, (long __user *)arg) : err;
38
39 set_val:
40         if (bdev != bdev->bd_contains)
41                 err = -EINVAL;
42         else {
43                 if (!capable(CAP_SYS_ADMIN))
44                         err = -EACCES;
45                 else {
46                         mutex_lock(&ide_setting_mtx);
47                         err = ide_devset_execute(drive, ds, arg);
48                         mutex_unlock(&ide_setting_mtx);
49                 }
50         }
51         return err;
52 }
53 EXPORT_SYMBOL_GPL(ide_setting_ioctl);
54
55 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
56                                   unsigned long arg)
57 {
58         u16 *id = NULL;
59         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
60         int rc = 0;
61
62         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
63                 rc = -ENOMSG;
64                 goto out;
65         }
66
67         id = kmalloc(size, GFP_KERNEL);
68         if (id == NULL) {
69                 rc = -ENOMEM;
70                 goto out;
71         }
72
73         memcpy(id, drive->id, size);
74         ata_id_to_hd_driveid(id);
75
76         if (copy_to_user((void __user *)arg, id, size))
77                 rc = -EFAULT;
78
79         kfree(id);
80 out:
81         return rc;
82 }
83
84 static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
85 {
86         return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
87                          << IDE_NICE_DSC_OVERLAP) |
88                         (!!(drive->dev_flags & IDE_DFLAG_NICE1)
89                          << IDE_NICE_1), (long __user *)arg);
90 }
91
92 static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
93 {
94         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
95                 return -EPERM;
96
97         if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
98             (drive->media != ide_tape))
99                 return -EPERM;
100
101         if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
102                 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
103         else
104                 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
105
106         if ((arg >> IDE_NICE_1) & 1)
107                 drive->dev_flags |= IDE_DFLAG_NICE1;
108         else
109                 drive->dev_flags &= ~IDE_DFLAG_NICE1;
110
111         return 0;
112 }
113
114 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
115 {
116         u8 *buf = NULL;
117         int bufsize = 0, err = 0;
118         u8 args[4], xfer_rate = 0;
119         struct ide_cmd cmd;
120         struct ide_taskfile *tf = &cmd.tf;
121         u16 *id = drive->id;
122
123         if (NULL == (void *) arg) {
124                 struct request *rq;
125
126                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
127                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
128                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
129                 blk_put_request(rq);
130
131                 return err;
132         }
133
134         if (copy_from_user(args, (void __user *)arg, 4))
135                 return -EFAULT;
136
137         memset(&cmd, 0, sizeof(cmd));
138         tf->feature = args[2];
139         if (args[0] == ATA_CMD_SMART) {
140                 tf->nsect = args[3];
141                 tf->lbal  = args[1];
142                 tf->lbam  = 0x4f;
143                 tf->lbah  = 0xc2;
144                 cmd.valid.out.tf = IDE_VALID_OUT_TF;
145                 cmd.valid.in.tf  = IDE_VALID_NSECT;
146         } else {
147                 tf->nsect = args[1];
148                 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
149                 cmd.valid.in.tf  = IDE_VALID_NSECT;
150         }
151         tf->command = args[0];
152         cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
153
154         if (args[3]) {
155                 cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
156                 bufsize = SECTOR_SIZE * args[3];
157                 buf = kzalloc(bufsize, GFP_KERNEL);
158                 if (buf == NULL)
159                         return -ENOMEM;
160         }
161
162         if (tf->command == ATA_CMD_SET_FEATURES &&
163             tf->feature == SETFEATURES_XFER &&
164             tf->nsect >= XFER_SW_DMA_0 &&
165             (id[ATA_ID_UDMA_MODES] ||
166              id[ATA_ID_MWDMA_MODES] ||
167              id[ATA_ID_SWDMA_MODES])) {
168                 xfer_rate = args[1];
169                 if (tf->nsect > XFER_UDMA_2 && !eighty_ninty_three(drive)) {
170                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
171                                             "be set\n", drive->name);
172                         goto abort;
173                 }
174         }
175
176         err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
177
178         args[0] = tf->status;
179         args[1] = tf->error;
180         args[2] = tf->nsect;
181
182         if (!err && xfer_rate) {
183                 /* active-retuning-calls future */
184                 ide_set_xfer_rate(drive, xfer_rate);
185                 ide_driveid_update(drive);
186         }
187 abort:
188         if (copy_to_user((void __user *)arg, &args, 4))
189                 err = -EFAULT;
190         if (buf) {
191                 if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
192                         err = -EFAULT;
193                 kfree(buf);
194         }
195         return err;
196 }
197
198 static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
199 {
200         void __user *p = (void __user *)arg;
201         int err = 0;
202         u8 args[7];
203         struct ide_cmd cmd;
204
205         if (copy_from_user(args, p, 7))
206                 return -EFAULT;
207
208         memset(&cmd, 0, sizeof(cmd));
209         memcpy(&cmd.tf.feature, &args[1], 6);
210         cmd.tf.command = args[0];
211         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
212         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
213
214         err = ide_no_data_taskfile(drive, &cmd);
215
216         args[0] = cmd.tf.command;
217         memcpy(&args[1], &cmd.tf.feature, 6);
218
219         if (copy_to_user(p, args, 7))
220                 err = -EFAULT;
221
222         return err;
223 }
224
225 static int generic_drive_reset(ide_drive_t *drive)
226 {
227         struct request *rq;
228         int ret = 0;
229
230         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
231         rq->cmd_type = REQ_TYPE_SPECIAL;
232         rq->cmd_len = 1;
233         rq->cmd[0] = REQ_DRIVE_RESET;
234         rq->cmd_flags |= REQ_SOFTBARRIER;
235         if (blk_execute_rq(drive->queue, NULL, rq, 1))
236                 ret = rq->errors;
237         blk_put_request(rq);
238         return ret;
239 }
240
241 int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev,
242                       unsigned int cmd, unsigned long arg)
243 {
244         int err;
245
246         err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
247         if (err != -EOPNOTSUPP)
248                 return err;
249
250         switch (cmd) {
251         case HDIO_OBSOLETE_IDENTITY:
252         case HDIO_GET_IDENTITY:
253                 if (bdev != bdev->bd_contains)
254                         return -EINVAL;
255                 return ide_get_identity_ioctl(drive, cmd, arg);
256         case HDIO_GET_NICE:
257                 return ide_get_nice_ioctl(drive, arg);
258         case HDIO_SET_NICE:
259                 if (!capable(CAP_SYS_ADMIN))
260                         return -EACCES;
261                 return ide_set_nice_ioctl(drive, arg);
262 #ifdef CONFIG_IDE_TASK_IOCTL
263         case HDIO_DRIVE_TASKFILE:
264                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
265                         return -EACCES;
266                 if (drive->media == ide_disk)
267                         return ide_taskfile_ioctl(drive, arg);
268                 return -ENOMSG;
269 #endif
270         case HDIO_DRIVE_CMD:
271                 if (!capable(CAP_SYS_RAWIO))
272                         return -EACCES;
273                 return ide_cmd_ioctl(drive, arg);
274         case HDIO_DRIVE_TASK:
275                 if (!capable(CAP_SYS_RAWIO))
276                         return -EACCES;
277                 return ide_task_ioctl(drive, arg);
278         case HDIO_DRIVE_RESET:
279                 if (!capable(CAP_SYS_ADMIN))
280                         return -EACCES;
281                 return generic_drive_reset(drive);
282         case HDIO_GET_BUSSTATE:
283                 if (!capable(CAP_SYS_ADMIN))
284                         return -EACCES;
285                 if (put_user(BUSSTATE_ON, (long __user *)arg))
286                         return -EFAULT;
287                 return 0;
288         case HDIO_SET_BUSSTATE:
289                 if (!capable(CAP_SYS_ADMIN))
290                         return -EACCES;
291                 return -EOPNOTSUPP;
292         default:
293                 return -EINVAL;
294         }
295 }
296 EXPORT_SYMBOL(generic_ide_ioctl);