+static int viocd_packet(struct cdrom_device_info *cdi,
+ struct packet_command *cgc)
+{
+ unsigned int buflen = cgc->buflen;
+ int ret = -EIO;
+
+ switch (cgc->cmd[0]) {
+ case GPCMD_READ_DISC_INFO:
+ {
+ disc_information *di = (disc_information *)cgc->buffer;
+
+ if (buflen >= 2) {
+ di->disc_information_length = cpu_to_be16(1);
+ ret = 0;
+ }
+ if (buflen >= 3)
+ di->erasable =
+ (cdi->ops->capability & ~cdi->mask
+ & (CDC_DVD_RAM | CDC_RAM)) != 0;
+ }
+ break;
+ default:
+ if (cgc->sense) {
+ /* indicate Unknown code */
+ cgc->sense->sense_key = 0x05;
+ cgc->sense->asc = 0x20;
+ cgc->sense->ascq = 0x00;
+ }
+ break;
+ }
+
+ cgc->stat = ret;
+ return ret;
+}
+