libata: implement HDIO_GET_IDENTITY

'hdparm -I' doesn't work with ATAPI devices and sg_sat is not widely
spread yet leaving no easy way to access ATAPI IDENTIFY data.
Implement HDIO_GET_IDENTITY such that at least 'hdparm -i' works.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 42 insertions, 1 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 9b5088ab2742..cc229e31432f 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -149,6 +149,45 @@ int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
 }
 
 /**
+ *      ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
+ *      @sdev: SCSI device to get identify data for
+ *      @arg: User buffer area for identify data
+ *
+ *      LOCKING:
+ *      Defined by the SCSI layer.  We don't really care.
+ *
+ *      RETURNS:
+ *      Zero on success, negative errno on error.
+ */
+static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
+{
+        struct ata_port *ap = ata_shost_to_port(sdev->host);
+        struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+        u16 __user *dst = arg;
+        char buf[40];
+
+        if (!dev)
+                return -ENOMSG;
+
+        if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
+                return -EFAULT;
+
+        ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
+        if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
+                return -EFAULT;
+
+        ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
+        if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
+                return -EFAULT;
+
+        ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
+        if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
+                return -EFAULT;
+
+        return 0;
+}
+
+/**
  *      ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
  *      @scsidev: Device to which we are issuing command
  *      @arg: User provided data for issuing command
@@ -159,7 +198,6 @@ int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
  *      RETURNS:
  *      Zero on success, negative errno on error.
  */
-
 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
 {
         int rc = 0;
@@ -359,6 +397,9 @@ int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
                         return -EINVAL;
                 return 0;
 
+        case HDIO_GET_IDENTITY:
+                return ata_get_identity(scsidev, arg);
+
         case HDIO_DRIVE_CMD:
                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
                         return -EACCES;