gscd.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:20k
- #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/sched.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 <linux/devfs_fs_kernel.h>
- #include <asm/system.h>
- #include <asm/io.h>
- #include <asm/uaccess.h>
- #define MAJOR_NR GOLDSTAR_CDROM_MAJOR
- #include <linux/blk.h>
- #define gscd_port gscd /* for compatible parameter passing with "insmod" */
- #include "gscd.h"
- static int gscd_blocksizes[1] = { 512 };
- 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_PARM(gscd, "h");
- /* Kommt spaeter vielleicht noch mal dran ...
- * static DECLARE_WAIT_QUEUE_HEAD(gscd_waitq);
- */
- static void gscd_transfer(void);
- static void gscd_read_cmd(void);
- 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(request_queue_t *);
- 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(kdev_t);
- /* GoldStar Funktionen */
- static void cc_Reset(void);
- static int wait_drv_ready(void);
- static int find_drives(void);
- static void cmd_out(int, char *, char *, int);
- static void cmd_status(void);
- static void cc_Ident(char *);
- static void cc_SetSpeed(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
- /* common GoldStar Initialization */
- static int my_gscd_init(void);
- /* 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 struct timer_list gscd_timer;
- static struct block_device_operations gscd_fops = {
- owner:THIS_MODULE,
- open:gscd_open,
- release:gscd_release,
- ioctl:gscd_ioctl,
- check_media_change:check_gscd_med_chg,
- };
- /*
- * Checking if the media has been changed
- * (not yet implemented)
- */
- static int check_gscd_med_chg(kdev_t full_dev)
- {
- int target;
- target = MINOR(full_dev);
- if (target > 0) {
- printk
- ("GSCD: GoldStar CD-ROM request error: invalid device.n");
- return 0;
- }
- #ifdef GSCD_DEBUG
- printk("gscd: check_med_changen");
- #endif
- return 0;
- }
- #ifndef MODULE
- /* Using new interface for kernel-parameters */
- static int __init gscd_setup(char *str)
- {
- int ints[2];
- (void) get_options(str, ARRAY_SIZE(ints), ints);
- if (ints[0] > 0) {
- gscd_port = ints[1];
- }
- return 1;
- }
- __setup("gscd=", gscd_setup);
- #endif
- static int gscd_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
- unsigned long arg)
- {
- unsigned char to_do[10];
- unsigned char dummy;
- switch (cmd) {
- case CDROMSTART: /* Spin up the drive */
- /* Don't think we can do this. Even if we could,
- * I think the drive times out and stops after a while
- * anyway. For now, ignore it.
- */
- return 0;
- case CDROMRESUME: /* keine Ahnung was das ist */
- return 0;
- case CDROMEJECT:
- cmd_status();
- to_do[0] = CMD_TRAY_CTL;
- cmd_out(TYPE_INFO, (char *) &to_do, (char *) &dummy, 0);
- return 0;
- default:
- return -EINVAL;
- }
- }
- /*
- * Take care of the different block sizes between cdrom and Linux.
- * When Linux gets variable block sizes this will probably go away.
- */
- static void gscd_transfer(void)
- {
- long offs;
- while (CURRENT->nr_sectors > 0 && gscd_bn == CURRENT->sector / 4) {
- offs = (CURRENT->sector & 3) * 512;
- memcpy(CURRENT->buffer, gscd_buf + offs, 512);
- CURRENT->nr_sectors--;
- CURRENT->sector++;
- CURRENT->buffer += 512;
- }
- }
- /*
- * I/O request routine called from Linux kernel.
- */
- static void do_gscd_request(request_queue_t * q)
- {
- __do_gscd_request(0);
- }
- static void __do_gscd_request(unsigned long dummy)
- {
- unsigned int block, dev;
- unsigned int nsect;
- repeat:
- if (QUEUE_EMPTY || CURRENT->rq_status == RQ_INACTIVE)
- goto out;
- INIT_REQUEST;
- dev = MINOR(CURRENT->rq_dev);
- block = CURRENT->sector;
- nsect = CURRENT->nr_sectors;
- if (QUEUE_EMPTY || CURRENT->sector == -1)
- goto out;
- if (CURRENT->cmd != READ) {
- printk("GSCD: bad cmd %dn", CURRENT->cmd);
- end_request(0);
- goto repeat;
- }
- if (MINOR(CURRENT->rq_dev) != 0) {
- printk("GSCD: this version supports only one devicen");
- end_request(0);
- goto repeat;
- }
- gscd_transfer();
- /* if we satisfied the request from the buffer, we're done. */
- if (CURRENT->nr_sectors == 0) {
- end_request(1);
- goto repeat;
- }
- #ifdef GSCD_DEBUG
- printk("GSCD: dev %d, block %d, nsect %dn", dev, block, nsect);
- #endif
- gscd_read_cmd();
- out:
- return;
- }
- /*
- * Check the result of the set-mode command. On success, send the
- * read-data command.
- */
- static void gscd_read_cmd(void)
- {
- long block;
- struct gscd_Play_msf gscdcmd;
- char cmd[] = { CMD_READ, 0x80, 0, 0, 0, 0, 1 }; /* cmd mode M-S-F secth sectl */
- cmd_status();
- if (disk_state & (ST_NO_DISK | ST_DOOR_OPEN)) {
- printk("GSCD: no disk or door openn");
- end_request(0);
- } else {
- if (disk_state & ST_INVALID) {
- printk("GSCD: disk invalidn");
- end_request(0);
- } else {
- gscd_bn = -1; /* purge our buffer */
- block = CURRENT->sector / 4;
- gscd_hsg2msf(block, &gscdcmd.start); /* cvt to msf format */
- cmd[2] = gscdcmd.start.min;
- cmd[3] = gscdcmd.start.sec;
- cmd[4] = gscdcmd.start.frame;
- #ifdef GSCD_DEBUG
- printk("GSCD: read msf %d:%d:%dn", cmd[2], cmd[3],
- cmd[4]);
- #endif
- cmd_out(TYPE_DATA, (char *) &cmd,
- (char *) &gscd_buf[0], 1);
- gscd_bn = CURRENT->sector / 4;
- gscd_transfer();
- end_request(1);
- }
- }
- SET_TIMER(__do_gscd_request, 1);
- }
- /*
- * Open the device special file. Check that a disk is in.
- */
- static int gscd_open(struct inode *ip, struct file *fp)
- {
- int st;
- #ifdef GSCD_DEBUG
- printk("GSCD: openn");
- #endif
- if (gscdPresent == 0)
- return -ENXIO; /* no hardware */
- get_status();
- st = disk_state & (ST_NO_DISK | ST_DOOR_OPEN);
- if (st) {
- printk("GSCD: no disk or door openn");
- return -ENXIO;
- }
- /* if (updateToc() < 0)
- return -EIO;
- */
- return 0;
- }
- /*
- * On close, we flush all gscd blocks from the buffer cache.
- */
- static int gscd_release(struct inode *inode, struct file *file)
- {
- #ifdef GSCD_DEBUG
- printk("GSCD: releasen");
- #endif
- gscd_bn = -1;
- return 0;
- }
- int get_status(void)
- {
- int status;
- cmd_status();
- status = disk_state & (ST_x08 | ST_x04 | ST_INVALID | ST_x01);
- if (status == (ST_x08 | ST_x04 | ST_INVALID | ST_x01)) {
- cc_invalidate();
- return 1;
- } else {
- return 0;
- }
- }
- void cc_invalidate(void)
- {
- drv_num_read = 0xFF;
- f_dsk_valid = 0xFF;
- current_drive = 0xFF;
- f_drv_ok = 0xFF;
- clear_Audio();
- }
- void clear_Audio(void)
- {
- f_AudioPlay = 0;
- f_AudioPause = 0;
- AudioStart_m = 0;
- AudioStart_f = 0;
- AudioEnd_m = 0;
- AudioEnd_f = 0;
- }
- /*
- * waiting ?
- */
- int wait_drv_ready(void)
- {
- int found, read;
- do {
- found = inb(GSCDPORT(0));
- found &= 0x0f;
- read = inb(GSCDPORT(0));
- read &= 0x0f;
- } while (read != found);
- #ifdef GSCD_DEBUG
- printk("Wait for: %dn", read);
- #endif
- return read;
- }
- void cc_Ident(char *respons)
- {
- char to_do[] = { CMD_IDENT, 0, 0 };
- cmd_out(TYPE_INFO, (char *) &to_do, (char *) respons, (int) 0x1E);
- }
- void cc_SetSpeed(void)
- {
- char to_do[] = { CMD_SETSPEED, 0, 0 };
- char dummy;
- if (speed > 0) {
- to_do[1] = speed & 0x0F;
- cmd_out(TYPE_INFO, (char *) &to_do, (char *) &dummy, 0);
- }
- }
- void cc_Reset(void)
- {
- char to_do[] = { CMD_RESET, 0 };
- char dummy;
- cmd_out(TYPE_INFO, (char *) &to_do, (char *) &dummy, 0);
- }
- void cmd_status(void)
- {
- char to_do[] = { CMD_STATUS, 0 };
- char dummy;
- cmd_out(TYPE_INFO, (char *) &to_do, (char *) &dummy, 0);
- #ifdef GSCD_DEBUG
- printk("GSCD: Status: %dn", disk_state);
- #endif
- }
- void cmd_out(int cmd_type, char *cmd, char *respo_buf, int respo_count)
- {
- int result;
- result = wait_drv_ready();
- if (result != drv_mode) {
- unsigned long test_loops = 0xFFFF;
- int i, dummy;
- outb(curr_drv_state, GSCDPORT(0));
- /* LOCLOOP_170 */
- do {
- result = wait_drv_ready();
- test_loops--;
- } while ((result != drv_mode) && (test_loops > 0));
- if (result != drv_mode) {
- disk_state = ST_x08 | ST_x04 | ST_INVALID;
- return;
- }
- /* ...and waiting */
- for (i = 1, dummy = 1; i < 0xFFFF; i++) {
- dummy *= i;
- }
- }
- /* LOC_172 */
- /* check the unit */
- /* and wake it up */
- if (cmd_unit_alive() != 0x08) {
- /* LOC_174 */
- /* game over for this unit */
- disk_state = ST_x08 | ST_x04 | ST_INVALID;
- return;
- }
- /* LOC_176 */
- #ifdef GSCD_DEBUG
- printk("LOC_176 ");
- #endif
- if (drv_mode == 0x09) {
- /* magic... */
- printk("GSCD: magic ...n");
- outb(result, GSCDPORT(2));
- }
- /* write the command to the drive */
- cmd_write_cmd(cmd);
- /* LOC_178 */
- for (;;) {
- result = wait_drv_ready();
- if (result != drv_mode) {
- /* LOC_179 */
- if (result == 0x04) { /* Mode 4 */
- /* LOC_205 */
- #ifdef GSCD_DEBUG
- printk("LOC_205 ");
- #endif
- disk_state = inb(GSCDPORT(2));
- do {
- result = wait_drv_ready();
- } while (result != drv_mode);
- return;
- } else {
- if (result == 0x06) { /* Mode 6 */
- /* LOC_181 */
- #ifdef GSCD_DEBUG
- printk("LOC_181 ");
- #endif
- if (cmd_type == TYPE_DATA) {
- /* read data */
- /* LOC_184 */
- if (drv_mode == 9) {
- /* read the data to the buffer (word) */
- /* (*(cmd+1))?(CD_FRAMESIZE/2):(CD_FRAMESIZE_RAW/2) */
- cmd_read_w
- (respo_buf,
- respo_count,
- CD_FRAMESIZE /
- 2);
- return;
- } else {
- /* read the data to the buffer (byte) */
- /* (*(cmd+1))?(CD_FRAMESIZE):(CD_FRAMESIZE_RAW) */
- cmd_read_b
- (respo_buf,
- respo_count,
- CD_FRAMESIZE);
- return;
- }
- } else {
- /* read the info to the buffer */
- cmd_info_in(respo_buf,
- respo_count);
- return;
- }
- return;
- }
- }
- } else {
- disk_state = ST_x08 | ST_x04 | ST_INVALID;
- return;
- }
- } /* for (;;) */
- #ifdef GSCD_DEBUG
- printk("n");
- #endif
- }
- static void cmd_write_cmd(char *pstr)
- {
- int i, j;
- /* LOC_177 */
- #ifdef GSCD_DEBUG
- printk("LOC_177 ");
- #endif
- /* calculate the number of parameter */
- j = *pstr & 0x0F;
- /* shift it out */
- for (i = 0; i < j; i++) {
- outb(*pstr, GSCDPORT(2));
- pstr++;
- }
- }
- static int cmd_unit_alive(void)
- {
- int result;
- unsigned long max_test_loops;
- /* LOC_172 */
- #ifdef GSCD_DEBUG
- printk("LOC_172 ");
- #endif
- outb(curr_drv_state, GSCDPORT(0));
- max_test_loops = 0xFFFF;
- do {
- result = wait_drv_ready();
- max_test_loops--;
- } while ((result != 0x08) && (max_test_loops > 0));
- return result;
- }
- static void cmd_info_in(char *pb, int count)
- {
- int result;
- char read;
- /* read info */
- /* LOC_182 */
- #ifdef GSCD_DEBUG
- printk("LOC_182 ");
- #endif
- do {
- read = inb(GSCDPORT(2));
- if (count > 0) {
- *pb = read;
- pb++;
- count--;
- }
- /* LOC_183 */
- do {
- result = wait_drv_ready();
- } while (result == 0x0E);
- } while (result == 6);
- cmd_end();
- return;
- }
- static void cmd_read_b(char *pb, int count, int size)
- {
- int result;
- int i;
- /* LOC_188 */
- /* LOC_189 */
- #ifdef GSCD_DEBUG
- printk("LOC_189 ");
- #endif
- do {
- do {
- result = wait_drv_ready();
- } while (result != 6 || result == 0x0E);
- if (result != 6) {
- cmd_end();
- return;
- }
- #ifdef GSCD_DEBUG
- printk("LOC_191 ");
- #endif
- for (i = 0; i < size; i++) {
- *pb = inb(GSCDPORT(2));
- pb++;
- }
- count--;
- } while (count > 0);
- cmd_end();
- return;
- }
- static void cmd_end(void)
- {
- int result;
- /* LOC_204 */
- #ifdef GSCD_DEBUG
- printk("LOC_204 ");
- #endif
- do {
- result = wait_drv_ready();
- if (result == drv_mode) {
- return;
- }
- } while (result != 4);
- /* LOC_205 */
- #ifdef GSCD_DEBUG
- printk("LOC_205 ");
- #endif
- disk_state = inb(GSCDPORT(2));
- do {
- result = wait_drv_ready();
- } while (result != drv_mode);
- return;
- }
- static void cmd_read_w(char *pb, int count, int size)
- {
- int result;
- int i;
- #ifdef GSCD_DEBUG
- printk("LOC_185 ");
- #endif
- do {
- /* LOC_185 */
- do {
- result = wait_drv_ready();
- } while (result != 6 || result == 0x0E);
- if (result != 6) {
- cmd_end();
- return;
- }
- for (i = 0; i < size; i++) {
- /* na, hier muss ich noch mal drueber nachdenken */
- *pb = inw(GSCDPORT(2));
- pb++;
- }
- count--;
- } while (count > 0);
- cmd_end();
- return;
- }
- int __init find_drives(void)
- {
- int *pdrv;
- int drvnum;
- int subdrv;
- int i;
- speed = 0;
- pdrv = (int *) &drv_states;
- curr_drv_state = 0xFE;
- subdrv = 0;
- drvnum = 0;
- for (i = 0; i < 8; i++) {
- subdrv++;
- cmd_status();
- disk_state &= ST_x08 | ST_x04 | ST_INVALID | ST_x01;
- if (disk_state != (ST_x08 | ST_x04 | ST_INVALID)) {
- /* LOC_240 */
- *pdrv = curr_drv_state;
- init_cd_drive(drvnum);
- pdrv++;
- drvnum++;
- } else {
- if (subdrv < 2) {
- continue;
- } else {
- subdrv = 0;
- }
- }
- /* curr_drv_state<<1; <-- das geht irgendwie nicht */
- /* muss heissen: curr_drv_state <<= 1; (ist ja Wert-Zuweisung) */
- curr_drv_state *= 2;
- curr_drv_state |= 1;
- #ifdef GSCD_DEBUG
- printk("DriveState: %dn", curr_drv_state);
- #endif
- }
- ndrives = drvnum;
- return drvnum;
- }
- void __init init_cd_drive(int num)
- {
- char resp[50];
- int i;
- printk("GSCD: init unit %dn", num);
- cc_Ident((char *) &resp);
- printk("GSCD: identification: ");
- for (i = 0; i < 0x1E; i++) {
- printk("%c", resp[i]);
- }
- printk("n");
- cc_SetSpeed();
- }
- #ifdef FUTURE_WORK
- /* return_done */
- static void update_state(void)
- {
- unsigned int AX;
- if ((disk_state & (ST_x08 | ST_x04 | ST_INVALID | ST_x01)) == 0) {
- if (disk_state == (ST_x08 | ST_x04 | ST_INVALID)) {
- AX = ST_INVALID;
- }
- if ((disk_state & (ST_x08 | ST_x04 | ST_INVALID | ST_x01))
- == 0) {
- invalidate();
- f_drv_ok = 0;
- }
- AX |= 0x8000;
- }
- if (disk_state & ST_PLAYING) {
- AX |= 0x200;
- }
- AX |= 0x100;
- /* pkt_esbx = AX; */
- disk_state = 0;
- }
- #endif
- /* Init for the Module-Version */
- int init_gscd(void)
- {
- long err;
- /* call the GoldStar-init */
- err = my_gscd_init();
- if (err < 0) {
- return err;
- } else {
- printk(KERN_INFO "Happy GoldStar !n");
- return 0;
- }
- }
- void __exit exit_gscd(void)
- {
- CLEAR_TIMER;
- devfs_unregister(devfs_find_handle
- (NULL, "gscd", 0, 0, DEVFS_SPECIAL_BLK, 0));
- if ((devfs_unregister_blkdev(MAJOR_NR, "gscd") == -EINVAL)) {
- printk("What's that: can't unregister GoldStar-modulen");
- return;
- }
- blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
- release_region(gscd_port, 4);
- printk(KERN_INFO "GoldStar-module released.n");
- }
- #ifdef MODULE
- module_init(init_gscd);
- #endif
- module_exit(exit_gscd);
- /* Test for presence of drive and initialize it. Called only at boot time. */
- int __init gscd_init(void)
- {
- return my_gscd_init();
- }
- /* This is the common initialisation for the GoldStar drive. */
- /* It is called at boot time AND for module init. */
- int __init my_gscd_init(void)
- {
- int i;
- int result;
- printk(KERN_INFO "GSCD: version %sn", GSCD_VERSION);
- printk(KERN_INFO
- "GSCD: Trying to detect a Goldstar R420 CD-ROM drive at 0x%X.n",
- gscd_port);
- if (check_region(gscd_port, 4)) {
- printk
- ("GSCD: Init failed, I/O port (%X) already in use.n",
- gscd_port);
- return -EIO;
- }
- /* check for card */
- result = wait_drv_ready();
- if (result == 0x09) {
- printk("GSCD: DMA kann ich noch nicht!n");
- return -EIO;
- }
- if (result == 0x0b) {
- drv_mode = result;
- i = find_drives();
- if (i == 0) {
- printk
- ("GSCD: GoldStar CD-ROM Drive is not found.n");
- return -EIO;
- }
- }
- if ((result != 0x0b) && (result != 0x09)) {
- printk
- ("GSCD: GoldStar Interface Adapter does not exist or H/W errorn");
- return -EIO;
- }
- /* reset all drives */
- i = 0;
- while (drv_states[i] != 0) {
- curr_drv_state = drv_states[i];
- printk(KERN_INFO "GSCD: Reset unit %d ... ", i);
- cc_Reset();
- printk("donen");
- i++;
- }
- if (devfs_register_blkdev(MAJOR_NR, "gscd", &gscd_fops) != 0) {
- printk
- ("GSCD: Unable to get major %d for GoldStar CD-ROMn",
- MAJOR_NR);
- return -EIO;
- }
- devfs_register(NULL, "gscd", DEVFS_FL_DEFAULT, MAJOR_NR, 0,
- S_IFBLK | S_IRUGO | S_IWUGO, &gscd_fops, NULL);
- blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
- blksize_size[MAJOR_NR] = gscd_blocksizes;
- read_ahead[MAJOR_NR] = 4;
- disk_state = 0;
- gscdPresent = 1;
- request_region(gscd_port, 4, "gscd");
- register_disk(NULL, MKDEV(MAJOR_NR, 0), 1, &gscd_fops, 0);
- printk(KERN_INFO "GSCD: GoldStar CD-ROM Drive found.n");
- return 0;
- }
- static void gscd_hsg2msf(long hsg, struct msf *msf)
- {
- hsg += CD_MSF_OFFSET;
- msf->min = hsg / (CD_FRAMES * CD_SECS);
- hsg %= CD_FRAMES * CD_SECS;
- msf->sec = hsg / CD_FRAMES;
- msf->frame = hsg % CD_FRAMES;
- gscd_bin2bcd(&msf->min); /* convert to BCD */
- gscd_bin2bcd(&msf->sec);
- gscd_bin2bcd(&msf->frame);
- }
- static void gscd_bin2bcd(unsigned char *p)
- {
- int u, t;
- u = *p % 10;
- t = *p / 10;
- *p = u | (t << 4);
- }
- #ifdef FUTURE_WORK
- static long gscd_msf2hsg(struct msf *mp)
- {
- return gscd_bcd2bin(mp->frame)
- + gscd_bcd2bin(mp->sec) * CD_FRAMES
- + gscd_bcd2bin(mp->min) * CD_FRAMES * CD_SECS - CD_MSF_OFFSET;
- }
- static int gscd_bcd2bin(unsigned char bcd)
- {
- return (bcd >> 4) * 10 + (bcd & 0xF);
- }
- #endif
- MODULE_AUTHOR("Oliver Raupach <raupach@nwfs1.rz.fh-hannover.de>");
- MODULE_LICENSE("GPL");
- EXPORT_NO_SYMBOLS;