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path: root/kernel/drivers/ide/ide-floppy_ioctl.c
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-rw-r--r--kernel/drivers/ide/ide-floppy_ioctl.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/kernel/drivers/ide/ide-floppy_ioctl.c b/kernel/drivers/ide/ide-floppy_ioctl.c
new file mode 100644
index 000000000..a22ca8467
--- /dev/null
+++ b/kernel/drivers/ide/ide-floppy_ioctl.c
@@ -0,0 +1,303 @@
+/*
+ * ide-floppy IOCTLs handling.
+ */
+
+#include <linux/kernel.h>
+#include <linux/ide.h>
+#include <linux/cdrom.h>
+#include <linux/mutex.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 DEFINE_MUTEX(ide_floppy_ioctl_mutex);
+static int ide_floppy_get_format_capacities(ide_drive_t *drive,
+ struct ide_atapi_pc *pc,
+ int __user *arg)
+{
+ struct ide_disk_obj *floppy = drive->driver_data;
+ int i, blocks, length, u_array_size, u_index;
+ int __user *argp;
+ u8 pc_buf[256], header_len, desc_cnt;
+
+ 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, pc_buf, pc->req_xfer)) {
+ 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,
+ u8 *buf, int b, int l,
+ int flags)
+{
+ ide_init_pc(pc);
+ pc->c[0] = GPCMD_FORMAT_UNIT;
+ pc->c[1] = 0x17;
+
+ memset(buf, 0, 12);
+ buf[1] = 0xA2;
+ /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
+
+ if (flags & 1) /* Verify bit on... */
+ buf[1] ^= 0x20; /* ... turn off DCRT bit */
+ buf[3] = 8;
+
+ put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
+ put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
+ pc->req_xfer = 12;
+ pc->flags |= PC_FLAG_WRITING;
+}
+
+static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
+{
+ struct ide_disk_obj *floppy = drive->driver_data;
+ u8 buf[20];
+
+ 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, buf, pc->req_xfer))
+ return 1;
+
+ if (buf[8 + 2] & 0x40)
+ drive->atapi_flags |= IDE_AFLAG_SRFP;
+
+ return 0;
+}
+
+static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
+ int __user *arg)
+{
+ struct ide_disk_obj *floppy = drive->driver_data;
+ u8 buf[12];
+ int blocks, length, flags, err = 0;
+
+ if (floppy->openers > 1) {
+ /* Don't format if someone is using the disk */
+ drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
+ return -EBUSY;
+ }
+
+ drive->dev_flags |= IDE_DFLAG_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;
+ }
+
+ ide_floppy_get_sfrp_bit(drive, pc);
+ ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);
+
+ if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
+ err = -EIO;
+
+out:
+ if (err)
+ drive->dev_flags &= ~IDE_DFLAG_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,
+ struct ide_atapi_pc *pc,
+ int __user *arg)
+{
+ struct ide_disk_obj *floppy = drive->driver_data;
+ u8 sense_buf[18];
+ 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, sense_buf,
+ pc->req_xfer))
+ 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)
+{
+ struct ide_disk_obj *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 ide_atapi_pc *pc,
+ fmode_t mode, 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, pc, argp);
+ case IDEFLOPPY_IOCTL_FORMAT_START:
+ if (!(mode & FMODE_WRITE))
+ return -EPERM;
+ return ide_floppy_format_unit(drive, pc, (int __user *)argp);
+ case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
+ return ide_floppy_get_format_progress(drive, pc, argp);
+ default:
+ return -ENOTTY;
+ }
+}
+
+int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
+ fmode_t mode, unsigned int cmd, unsigned long arg)
+{
+ struct ide_atapi_pc pc;
+ void __user *argp = (void __user *)arg;
+ int err;
+
+ mutex_lock(&ide_floppy_ioctl_mutex);
+ if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
+ err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
+ goto out;
+ }
+
+ err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
+ if (err != -ENOTTY)
+ goto out;
+
+ /*
+ * 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_blk_ioctl(bdev, mode, cmd, argp);
+
+ if (err == -ENOTTY)
+ err = generic_ide_ioctl(drive, bdev, cmd, arg);
+
+out:
+ mutex_unlock(&ide_floppy_ioctl_mutex);
+ return err;
+}