path: root/drivers/cdrom/gscd.c

#define GSCD_VERSION "0.4a Oliver Raupach <raupach@nwfs1.rz.fh-hannover.de>"

/*
	linux/drivers/block/gscd.c - GoldStar R420 CDROM driver

        Copyright (C) 1995  Oliver Raupach <raupach@nwfs1.rz.fh-hannover.de>
        based upon pre-works by   Eberhard Moenkeberg <emoenke@gwdg.de>
        

        For all kind of other information about the GoldStar CDROM
        and this Linux device driver I installed a WWW-URL:
        http://linux.rz.fh-hannover.de/~raupach        


             If you are the editor of a Linux CD, you should
             enable gscd.c within your boot floppy kernel and
             send me one of your CDs for free.


        --------------------------------------------------------------------
	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	
	--------------------------------------------------------------------
	
	9 November 1999 -- Make kernel-parameter implementation work with 2.3.x 
	                   Removed init_module & cleanup_module in favor of 
		   	   module_init & module_exit.
			   Torben Mathiasen <tmm@image.dk>

*/

/* These settings are for various debug-level. Leave they untouched ... */
#define  NO_GSCD_DEBUG
#define  NO_IOCTL_DEBUG
#define  NO_MODULE_DEBUG
#define  NO_FUTURE_WORK
/*------------------------*/

#include <linux/module.h>

#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/timer.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/cdrom.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/init.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/uaccess.h>

#define MAJOR_NR GOLDSTAR_CDROM_MAJOR
#include <linux/blkdev.h>
#include "gscd.h"

static int gscdPresent = 0;

static unsigned char gscd_buf[2048];	/* buffer for block size conversion */
static int gscd_bn = -1;
static short gscd_port = GSCD_BASE_ADDR;
module_param_named(gscd, gscd_port, short, 0);

/* Kommt spaeter vielleicht noch mal dran ...
 *    static DECLARE_WAIT_QUEUE_HEAD(gscd_waitq);
 */

static void gscd_read_cmd(struct request *req);
static void gscd_hsg2msf(long hsg, struct msf *msf);
static void gscd_bin2bcd(unsigned char *p);

/* Schnittstellen zum Kern/FS */

static void __do_gscd_request(unsigned long dummy);
static int gscd_ioctl(struct inode *, struct file *, unsigned int,
		      unsigned long);
static int gscd_open(struct inode *, struct file *);
static int gscd_release(struct inode *, struct file *);
static int check_gscd_med_chg(struct gendisk *disk);

/*      GoldStar Funktionen    */

static void cmd_out(int, char *, char *, int);
static void cmd_status(void);
static void init_cd_drive(int);

static int get_status(void);
static void clear_Audio(void);
static void cc_invalidate(void);

/* some things for the next version */
#ifdef FUTURE_WORK
static void update_state(void);
static long gscd_msf2hsg(struct msf *mp);
static int gscd_bcd2bin(unsigned char bcd);
#endif


/*      lo-level cmd-Funktionen    */

static void cmd_info_in(char *, int);
static void cmd_end(void);
static void cmd_read_b(char *, int, int);
static void cmd_read_w(char *, int, int);
static int cmd_unit_alive(void);
static void cmd_write_cmd(char *);


/*      GoldStar Variablen     */

static int curr_drv_state;
static int drv_states[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static int drv_mode;
static int disk_state;
static int speed;
static int ndrives;

static unsigned char drv_num_read;
static unsigned char f_dsk_valid;
static unsigned char current_drive;
static unsigned char f_drv_ok;


static char f_AudioPlay;
static char f_AudioPause;
static int AudioStart_m;
static int AudioStart_f;
static int AudioEnd_m;
static int AudioEnd_f;

static DEFINE_TIMER(gscd_timer, NULL, 0, 0);
static DEFINE_SPINLOCK(gscd_lock);
static struct request_queue *gscd_queue;

static struct block_device_operations gscd_fops = {
	.owner		= THIS_MODULE,
	.open		= gscd_open,
	.release	= gscd_release,
	.ioctl		= gscd_ioctl,
	.media_changed	= check_gscd_med_chg,
};

/* 
 * Checking if the media has been changed
 * (not yet implemented)
 */
static int check_gscd_med_chg(struct gendisk *disk)
{
#ifdef GSCD_DEBUG
	printk("gscd: check_med_change\n");
#endif
	return 0;
}


#ifndef MODULE
/* Using new interface for kernel-parameters */

static int __init gscd_setup(char *str)
{
	int ints[2];