[mirror_ubuntu-zesty-kernel.git] / drivers / ide / ide-floppy_ioctl.c

/*
 * ide-floppy IOCTLs handling.
 */

#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/cdrom.h>

#include <asm/unaligned.h>

#include <scsi/scsi_ioctl.h>

#include "ide-floppy.h"

/*
 * Obtain the list of formattable capacities.
 * Very similar to ide_floppy_get_capacity, except that we push the capacity
 * descriptors to userland, instead of our own structures.
 *
 * Userland gives us the following structure:
 *
 * struct idefloppy_format_capacities {
 *	int nformats;
 *	struct {
 *		int nblocks;
 *		int blocksize;
 *	} formats[];
 * };
 *
 * userland initializes nformats to the number of allocated formats[] records.
 * On exit we set nformats to the number of records we've actually initialized.
 */

static int ide_floppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
{
	struct ide_floppy_obj *floppy = drive->driver_data;
	struct ide_atapi_pc pc;
	u8 header_len, desc_cnt;
	int i, blocks, length, u_array_size, u_index;
	int __user *argp;

	if (get_user(u_array_size, arg))
		return -EFAULT;

	if (u_array_size <= 0)
		return -EINVAL;

	ide_floppy_create_read_capacity_cmd(&pc);
	if (ide_queue_pc_tail(drive, floppy->disk, &pc)) {
		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
		return -EIO;
	}

	header_len = pc.buf[3];
	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

	u_index = 0;
	argp = arg + 1;

	/*
	 * We always skip the first capacity descriptor.  That's the current
	 * capacity.  We are interested in the remaining descriptors, the
	 * formattable capacities.
	 */
	for (i = 1; i < desc_cnt; i++) {
		unsigned int desc_start = 4 + i*8;

		if (u_index >= u_array_size)
			break;	/* User-supplied buffer too small */

		blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
		length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);

		if (put_user(blocks, argp))
			return -EFAULT;

		++argp;

		if (put_user(length, argp))
			return -EFAULT;

		++argp;

		++u_index;
	}

	if (put_user(u_index, arg))
		return -EFAULT;

	return 0;
}

static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
		int l, int flags)
{
	ide_init_pc(pc);
	pc->c[0] = GPCMD_FORMAT_UNIT;
	pc->c[1] = 0x17;

	memset(pc->buf, 0, 12);
	pc->buf[1] = 0xA2;
	/* Default format list header, u8 1: FOV/DCRT/IMM bits set */

	if (flags & 1)				/* Verify bit on... */
		pc->buf[1] ^= 0x20;		/* ... turn off DCRT bit */
	pc->buf[3] = 8;

	put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
	put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
	pc->buf_size = 12;
	pc->flags |= PC_FLAG_WRITING;
}

static int ide_floppy_get_sfrp_bit(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct ide_atapi_pc pc;

	drive->atapi_flags &= ~IDE_AFLAG_SRFP;

	ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE);
	pc.flags |= PC_FLAG_SUPPRESS_ERROR;

	if (ide_queue_pc_tail(drive, floppy->disk, &pc))
		return 1;

	if (pc.buf[8 + 2] & 0x40)
		drive->atapi_flags |= IDE_AFLAG_SRFP;

	return 0;
}

static int ide_floppy_format_unit(ide_drive_t *drive, int __user *arg)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct ide_atapi_pc pc;
	int blocks, length, flags, err = 0;

	if (floppy->openers > 1) {
		/* Don't format if someone is using the disk */
		drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
		return -EBUSY;
	}

	drive->atapi_flags |= IDE_AFLAG_FORMAT_IN_PROGRESS;

	/*
	 * Send ATAPI_FORMAT_UNIT to the drive.
	 *
	 * Userland gives us the following structure:
	 *
	 * struct idefloppy_format_command {
	 *        int nblocks;
	 *        int blocksize;
	 *        int flags;
	 *        } ;
	 *
	 * flags is a bitmask, currently, the only defined flag is:
	 *
	 *        0x01 - verify media after format.
	 */
	if (get_user(blocks, arg) ||
			get_user(length, arg+1) ||
			get_user(flags, arg+2)) {
		err = -EFAULT;
		goto out;
	}

	(void)ide_floppy_get_sfrp_bit(drive);
	ide_floppy_create_format_unit_cmd(&pc, blocks, length, flags);

	if (ide_queue_pc_tail(drive, floppy->disk, &pc))
		err = -EIO;

out:
	if (err)
		drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
	return err;
}

/*
 * Get ATAPI_FORMAT_UNIT progress indication.
 *
 * Userland gives a pointer to an int.  The int is set to a progress
 * indicator 0-65536, with 65536=100%.
 *
 * If the drive does not support format progress indication, we just check
 * the dsc bit, and return either 0 or 65536.
 */

static int ide_floppy_get_format_progress(ide_drive_t *drive, int __user *arg)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct ide_atapi_pc pc;
	int progress_indication = 0x10000;

	if (drive->atapi_flags & IDE_AFLAG_SRFP) {
		ide_create_request_sense_cmd(drive, &pc);
		if (ide_queue_pc_tail(drive, floppy->disk, &pc))
			return -EIO;

		if (floppy->sense_key == 2 &&
		    floppy->asc == 4 &&
		    floppy->ascq == 4)
			progress_indication = floppy->progress_indication;

		/* Else assume format_unit has finished, and we're at 0x10000 */
	} else {
		ide_hwif_t *hwif = drive->hwif;
		unsigned long flags;
		u8 stat;

		local_irq_save(flags);
		stat = hwif->tp_ops->read_status(hwif);
		local_irq_restore(flags);

		progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
	}

	if (put_user(progress_indication, arg))
		return -EFAULT;

	return 0;
}

static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
			       unsigned long arg, unsigned int cmd)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct gendisk *disk = floppy->disk;
	int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;

	if (floppy->openers > 1)
		return -EBUSY;

	ide_set_media_lock(drive, disk, prevent);

	if (cmd == CDROMEJECT)
		ide_do_start_stop(drive, disk, 2);

	return 0;
}

static int ide_floppy_format_ioctl(ide_drive_t *drive, struct file *file,
				   unsigned int cmd, void __user *argp)
{
	switch (cmd) {
	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
		return 0;
	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
		return ide_floppy_get_format_capacities(drive, argp);
	case IDEFLOPPY_IOCTL_FORMAT_START:
		if (!(file->f_mode & 2))
			return -EPERM;
		return ide_floppy_format_unit(drive, (int __user *)argp);
	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
		return ide_floppy_get_format_progress(drive, argp);
	default:
		return -ENOTTY;
	}
}

int ide_floppy_ioctl(struct inode *inode, struct file *file,
		    unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct ide_floppy_obj *floppy = ide_drv_g(bdev->bd_disk,
						     ide_floppy_obj);
	ide_drive_t *drive = floppy->drive;
	struct ide_atapi_pc pc;
	void __user *argp = (void __user *)arg;
	int err;

	if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
		return ide_floppy_lockdoor(drive, &pc, arg, cmd);

	err = ide_floppy_format_ioctl(drive, file, cmd, argp);
	if (err != -ENOTTY)
		return err;

	/*
	 * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
	 * and CDROM_SEND_PACKET (legacy) ioctls
	 */
	if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
		err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
					bdev->bd_disk, cmd, argp);

	if (err == -ENOTTY)
		err = generic_ide_ioctl(drive, file, bdev, cmd, arg);

	return err;
}
Commit	Line	Data
0127854d BZ	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, int __user arg)
	35	{
	36	struct ide_floppy_obj *floppy = drive->driver_data;
	37	struct ide_atapi_pc pc;
	38	u8 header_len, desc_cnt;
	39	int i, blocks, length, u_array_size, u_index;
	40	int __user *argp;
	41
	42	if (get_user(u_array_size, arg))
	43	return -EFAULT;
	44
	45	if (u_array_size <= 0)
	46	return -EINVAL;
	47
	48	ide_floppy_create_read_capacity_cmd(&pc);
	49	if (ide_queue_pc_tail(drive, floppy->disk, &pc)) {
	50	printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
	51	return -EIO;
	52	}
	53
	54	header_len = pc.buf[3];
	55	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
	56
	57	u_index = 0;
	58	argp = arg + 1;
	59
	60	/*
	61	* We always skip the first capacity descriptor. That's the current
	62	* capacity. We are interested in the remaining descriptors, the
	63	* formattable capacities.
	64	*/
65	for (i = 1; i < desc_cnt; i++) {
66	unsigned int desc_start = 4 + i*8;
67
68	if (u_index >= u_array_size)
69	break; /* User-supplied buffer too small */
70
71	blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
72	length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
73
74	if (put_user(blocks, argp))
75	return -EFAULT;
76
77	++argp;
78
79	if (put_user(length, argp))
80	return -EFAULT;
81
82	++argp;
83
84	++u_index;
85	}
86
87	if (put_user(u_index, arg))
88	return -EFAULT;
89
90	return 0;
91	}
92
93	static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
94	int l, int flags)
95	{
96	ide_init_pc(pc);
97	pc->c[0] = GPCMD_FORMAT_UNIT;
98	pc->c[1] = 0x17;
99
100	memset(pc->buf, 0, 12);
101	pc->buf[1] = 0xA2;
102	/* Default format list header, u8 1: FOV/DCRT/IMM bits set */
103
104	if (flags & 1) /* Verify bit on... */
105	pc->buf[1] ^= 0x20; /* ... turn off DCRT bit */
106	pc->buf[3] = 8;
107
108	put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
109	put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
110	pc->buf_size = 12;
111	pc->flags \|= PC_FLAG_WRITING;
112	}
113
114	static int ide_floppy_get_sfrp_bit(ide_drive_t *drive)
115	{
116	idefloppy_floppy_t *floppy = drive->driver_data;
117	struct ide_atapi_pc pc;
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, int __user arg)
134	{
135	idefloppy_floppy_t *floppy = drive->driver_data;
136	struct ide_atapi_pc pc;
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->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
142	return -EBUSY;
143	}
144
145	drive->atapi_flags \|= IDE_AFLAG_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	(void)ide_floppy_get_sfrp_bit(drive);
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->atapi_flags &= ~IDE_AFLAG_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, int __user arg)
192	{
193	idefloppy_floppy_t *floppy = drive->driver_data;
194	struct ide_atapi_pc pc;
195	int progress_indication = 0x10000;
196
197	if (drive->atapi_flags & IDE_AFLAG_SRFP) {
6b0da28b	198	ide_create_request_sense_cmd(drive, &pc);
0127854d BZ	199	if (ide_queue_pc_tail(drive, floppy->disk, &pc))
	200	return -EIO;
	201
	202	if (floppy->sense_key == 2 &&
	203	floppy->asc == 4 &&
	204	floppy->ascq == 4)
	205	progress_indication = floppy->progress_indication;
	206
	207	/* Else assume format_unit has finished, and we're at 0x10000 */
	208	} else {
	209	ide_hwif_t *hwif = drive->hwif;
	210	unsigned long flags;
	211	u8 stat;
	212
	213	local_irq_save(flags);
	214	stat = hwif->tp_ops->read_status(hwif);
	215	local_irq_restore(flags);
	216
	217	progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
	218	}
	219
	220	if (put_user(progress_indication, arg))
	221	return -EFAULT;
	222
	223	return 0;
	224	}
	225
5bb1536a BZ	226	static int ide_floppy_lockdoor(ide_drive_t drive, struct ide_atapi_pc pc,
	227	unsigned long arg, unsigned int cmd)
	228	{
	229	idefloppy_floppy_t *floppy = drive->driver_data;
	230	struct gendisk *disk = floppy->disk;
	231	int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
	232
	233	if (floppy->openers > 1)
	234	return -EBUSY;
	235
	236	ide_set_media_lock(drive, disk, prevent);
	237
	238	if (cmd == CDROMEJECT)
	239	ide_do_start_stop(drive, disk, 2);
	240
	241	return 0;
	242	}
	243
	244	static int ide_floppy_format_ioctl(ide_drive_t drive, struct file file,
	245	unsigned int cmd, void __user *argp)
0127854d BZ	246	{
	247	switch (cmd) {
	248	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
	249	return 0;
	250	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
	251	return ide_floppy_get_format_capacities(drive, argp);
	252	case IDEFLOPPY_IOCTL_FORMAT_START:
	253	if (!(file->f_mode & 2))
	254	return -EPERM;
	255	return ide_floppy_format_unit(drive, (int __user *)argp);
	256	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
	257	return ide_floppy_get_format_progress(drive, argp);
	258	default:
	259	return -ENOTTY;
	260	}
	261	}
5bb1536a BZ	262
	263	int ide_floppy_ioctl(struct inode inode, struct file file,
	264	unsigned int cmd, unsigned long arg)
	265	{
	266	struct block_device *bdev = inode->i_bdev;
	267	struct ide_floppy_obj *floppy = ide_drv_g(bdev->bd_disk,
	268	ide_floppy_obj);
	269	ide_drive_t *drive = floppy->drive;
	270	struct ide_atapi_pc pc;
	271	void __user argp = (void __user )arg;
	272	int err;
	273
	274	if (cmd == CDROMEJECT \|\| cmd == CDROM_LOCKDOOR)
	275	return ide_floppy_lockdoor(drive, &pc, arg, cmd);
	276
	277	err = ide_floppy_format_ioctl(drive, file, cmd, argp);
	278	if (err != -ENOTTY)
	279	return err;
	280
	281	/*
	282	* skip SCSI_IOCTL_SEND_COMMAND (deprecated)
	283	* and CDROM_SEND_PACKET (legacy) ioctls
	284	*/
	285	if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
	286	err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
	287	bdev->bd_disk, cmd, argp);
	288
	289	if (err == -ENOTTY)
	290	err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
	291
	292	return err;
	293	}