--- /dev/null
+
+README for the SCSI media changer driver
+========================================
+
+This is a driver for SCSI Medium Changer devices, which are listed
+with "Type: Medium Changer" in /proc/scsi/scsi.
+
+This is for *real* Jukeboxes. It is *not* supported to work with
+common small CD-ROM changers, neither one-lun-per-slot SCSI changers
+nor IDE drives.
+
+Userland tools available from here:
+ http://linux.bytesex.org/misc/changer.html
+
+
+General Information
+-------------------
+
+First some words about how changers work: A changer has 2 (possibly
+more) SCSI ID's. One for the changer device which controls the robot,
+and one for the device which actually reads and writes the data. The
+later may be anything, a MOD, a CD-ROM, a tape or whatever. For the
+changer device this is a "don't care", he *only* shuffles around the
+media, nothing else.
+
+
+The SCSI changer model is complex, compared to - for example - IDE-CD
+changers. But it allows to handle nearly all possible cases. It knows
+4 different types of changer elements:
+
+ media transport - this one shuffles around the media, i.e. the
+ transport arm. Also known as "picker".
+ storage - a slot which can hold a media.
+ import/export - the same as above, but is accessable from outside,
+ i.e. there the operator (you !) can use this to
+ fill in and remove media from the changer.
+ Sometimes named "mailslot".
+ data transfer - this is the device which reads/writes, i.e. the
+ CD-ROM / Tape / whatever drive.
+
+None of these is limited to one: A huge Jukebox could have slots for
+123 CD-ROM's, 5 CD-ROM readers (and therefore 6 SCSI ID's: the changer
+and each CD-ROM) and 2 transport arms. No problem to handle.
+
+
+How it is implemented
+---------------------
+
+I implemented the driver as character device driver with a NetBSD-like
+ioctl interface. Just grabbed NetBSD's header file and one of the
+other linux SCSI device drivers as starting point. The interface
+should be source code compatible with NetBSD. So if there is any
+software (anybody knows ???) which supports a BSDish changer driver,
+it should work with this driver too.
+
+Over time a few more ioctls where added, volume tag support for example
+wasn't covered by the NetBSD ioctl API.
+
+
+Current State
+-------------
+
+Support for more than one transport arm is not implemented yet (and
+nobody asked for it so far...).
+
+I test and use the driver myself with a 35 slot cdrom jukebox from
+Grundig. I got some reports telling it works ok with tape autoloaders
+(Exabyte, HP and DEC). Some People use this driver with amanda. It
+works fine with small (11 slots) and a huge (4 MOs, 88 slots)
+magneto-optical Jukebox. Probably with lots of other changers too, most
+(but not all :-) people mail me only if it does *not* work...
+
+I don't have any device lists, neither black-list nor white-list. Thus
+it is quite useless to ask me whenever a specific device is supported or
+not. In theory every changer device which supports the SCSI-2 media
+changer command set should work out-of-the-box with this driver. If it
+doesn't, it is a bug. Either within the driver or within the firmware
+of the changer device.
+
+
+Using it
+--------
+
+This is a character device with major number is 86, so use
+"mknod /dev/sch0 c 86 0" to create the special file for the driver.
+
+If the module finds the changer, it prints some messages about the
+device [ try "dmesg" if you don't see anything ] and should show up in
+/proc/devices. If not.... some changers use ID ? / LUN 0 for the
+device and ID ? / LUN 1 for the robot mechanism. But Linux does *not*
+look for LUN's other than 0 as default, becauce there are to many
+broken devices. So you can try:
+
+ 1) echo "scsi add-single-device 0 0 ID 1" > /proc/scsi/scsi
+ (replace ID with the SCSI-ID of the device)
+ 2) boot the kernel with "max_scsi_luns=1" on the command line
+ (append="max_scsi_luns=1" in lilo.conf should do the trick)
+
+
+Trouble?
+--------
+
+If you insmod the driver with "insmod debug=1", it will be verbose and
+prints a lot of stuff to the syslog. Compiling the kernel with
+CONFIG_SCSI_CONSTANTS=y improves the quality of the error messages alot
+because the kernel will translate the error codes into human-readable
+strings then.
+
+You can display these messages with the dmesg command (or check the
+logfiles). If you email me some question becauce of a problem with the
+driver, please include these messages.
+
+
+Insmod options
+--------------
+
+debug=0/1
+ Enable debug messages (see above, default: 0).
+
+verbose=0/1
+ Be verbose (default: 1).
+
+init=0/1
+ Send INITIALIZE ELEMENT STATUS command to the changer
+ at insmod time (default: 1).
+
+timeout_init=<seconds>
+ timeout for the INITIALIZE ELEMENT STATUS command
+ (default: 3600).
+
+timeout_move=<seconds>
+ timeout for all other commands (default: 120).
+
+dt_id=<id1>,<id2>,...
+dt_lun=<lun1>,<lun2>,...
+ These two allow to specify the SCSI ID and LUN for the data
+ transfer elements. You likely don't need this as the jukebox
+ should provide this information. But some devices don't ...
+
+vendor_firsts=
+vendor_counts=
+vendor_labels=
+ These insmod options can be used to tell the driver that there
+ are some vendor-specific element types. Grundig for example
+ does this. Some jukeboxes have a printer to label fresh burned
+ CDs, which is addressed as element 0xc000 (type 5). To tell the
+ driver about this vendor-specific element, use this:
+ $ insmod ch \
+ vendor_firsts=0xc000 \
+ vendor_counts=1 \
+ vendor_labels=printer
+ All three insmod options accept up to four comma-separated
+ values, this way you can configure the element types 5-8.
+ You likely need the SCSI specs for the device in question to
+ find the correct values as they are not covered by the SCSI-2
+ standard.
+
+
+Credits
+-------
+
+I wrote this driver using the famous mailing-patches-around-the-world
+method. With (more or less) help from:
+
+ Daniel Moehwald <moehwald@hdg.de>
+ Dane Jasper <dane@sonic.net>
+ R. Scott Bailey <sbailey@dsddi.eds.com>
+ Jonathan Corbet <corbet@lwn.net>
+
+Special thanks go to
+ Martin Kuehne <martin.kuehne@bnbt.de>
+for a old, second-hand (but full functional) cdrom jukebox which I use
+to develop/test driver and tools now.
+
+Have fun,
+
+ Gerd
+
+--
+Gerd Knorr <kraxel@bytesex.org>
--- /dev/null
+/*
+ * SCSI Media Changer device driver for Linux 2.6
+ *
+ * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
+ *
+ */
+
+#define VERSION "0.25"
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/completion.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/ioctl32.h>
+#include <linux/compat.h>
+#include <linux/chio.h> /* here are all the ioctls */
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_request.h>
+#include <scsi/scsi_dbg.h>
+
+#define CH_DT_MAX 16
+#define CH_TYPES 8
+
+MODULE_DESCRIPTION("device driver for scsi media changer devices");
+MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
+MODULE_LICENSE("GPL");
+
+static int init = 1;
+module_param(init, int, 0444);
+MODULE_PARM_DESC(init, \
+ "initialize element status on driver load (default: on)");
+
+static int timeout_move = 300;
+module_param(timeout_move, int, 0644);
+MODULE_PARM_DESC(timeout_move,"timeout for move commands "
+ "(default: 300 seconds)");
+
+static int timeout_init = 3600;
+module_param(timeout_init, int, 0644);
+MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
+ "(default: 3600 seconds)");
+
+static int verbose = 1;
+module_param(verbose, int, 0644);
+MODULE_PARM_DESC(verbose,"be verbose (default: on)");
+
+static int debug = 0;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
+ "detailed sense codes on scsi errors (default: off)");
+
+static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
+static int dt_lun[CH_DT_MAX];
+module_param_array(dt_id, int, NULL, 0444);
+module_param_array(dt_lun, int, NULL, 0444);
+
+/* tell the driver about vendor-specific slots */
+static int vendor_firsts[CH_TYPES-4];
+static int vendor_counts[CH_TYPES-4];
+module_param_array(vendor_firsts, int, NULL, 0444);
+module_param_array(vendor_counts, int, NULL, 0444);
+
+static char *vendor_labels[CH_TYPES-4] = {
+ "v0", "v1", "v2", "v3"
+};
+// module_param_string_array(vendor_labels, NULL, 0444);
+
+#define dprintk(fmt, arg...) if (debug) \
+ printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
+#define vprintk(fmt, arg...) if (verbose) \
+ printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
+
+/* ------------------------------------------------------------------- */
+
+#define MAX_RETRIES 1
+
+static int ch_probe(struct device *);
+static int ch_remove(struct device *);
+static int ch_open(struct inode * inode, struct file * filp);
+static int ch_release(struct inode * inode, struct file * filp);
+static int ch_ioctl(struct inode * inode, struct file * filp,
+ unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+static long ch_ioctl_compat(struct file * filp,
+ unsigned int cmd, unsigned long arg);
+#endif
+
+static struct class_simple * ch_sysfs_class;
+
+typedef struct {
+ struct list_head list;
+ int minor;
+ char name[8];
+ struct scsi_device *device;
+ struct scsi_device **dt; /* ptrs to data transfer elements */
+ u_int firsts[CH_TYPES];
+ u_int counts[CH_TYPES];
+ u_int unit_attention;
+ u_int voltags;
+ struct semaphore lock;
+} scsi_changer;
+
+static LIST_HEAD(ch_devlist);
+static spinlock_t ch_devlist_lock = SPIN_LOCK_UNLOCKED;
+static int ch_devcount;
+
+static struct scsi_driver ch_template =
+{
+ .owner = THIS_MODULE,
+ .gendrv = {
+ .name = "ch",
+ .probe = ch_probe,
+ .remove = ch_remove,
+ },
+};
+
+static struct file_operations changer_fops =
+{
+ .owner = THIS_MODULE,
+ .open = ch_open,
+ .release = ch_release,
+ .ioctl = ch_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ch_ioctl_compat,
+#endif
+};
+
+static struct {
+ unsigned char sense;
+ unsigned char asc;
+ unsigned char ascq;
+ int errno;
+} err[] = {
+/* Just filled in what looks right. Hav'nt checked any standard paper for
+ these errno assignments, so they may be wrong... */
+ {
+ .sense = ILLEGAL_REQUEST,
+ .asc = 0x21,
+ .ascq = 0x01,
+ .errno = EBADSLT, /* Invalid element address */
+ },{
+ .sense = ILLEGAL_REQUEST,
+ .asc = 0x28,
+ .ascq = 0x01,
+ .errno = EBADE, /* Import or export element accessed */
+ },{
+ .sense = ILLEGAL_REQUEST,
+ .asc = 0x3B,
+ .ascq = 0x0D,
+ .errno = EXFULL, /* Medium destination element full */
+ },{
+ .sense = ILLEGAL_REQUEST,
+ .asc = 0x3B,
+ .ascq = 0x0E,
+ .errno = EBADE, /* Medium source element empty */
+ },{
+ .sense = ILLEGAL_REQUEST,
+ .asc = 0x20,
+ .ascq = 0x00,
+ .errno = EBADRQC, /* Invalid command operation code */
+ },{
+ /* end of list */
+ }
+};
+
+/* ------------------------------------------------------------------- */
+
+static int ch_find_errno(unsigned char *sense_buffer)
+{
+ int i,errno = 0;
+
+ /* Check to see if additional sense information is available */
+ if (sense_buffer[7] > 5 &&
+ sense_buffer[12] != 0) {
+ for (i = 0; err[i].errno != 0; i++) {
+ if (err[i].sense == sense_buffer[ 2] &&
+ err[i].asc == sense_buffer[12] &&
+ err[i].ascq == sense_buffer[13]) {
+ errno = -err[i].errno;
+ break;
+ }
+ }
+ }
+ if (errno == 0)
+ errno = -EIO;
+ return errno;
+}
+
+static int
+ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
+ void *buffer, unsigned buflength,
+ enum dma_data_direction direction)
+{
+ int errno, retries = 0, timeout;
+ struct scsi_request *sr;
+
+ sr = scsi_allocate_request(ch->device, GFP_KERNEL);
+ if (NULL == sr)
+ return -ENOMEM;
+
+ timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
+ ? timeout_init : timeout_move;
+
+ retry:
+ errno = 0;
+ if (debug) {
+ dprintk("command: ");
+ __scsi_print_command(cmd);
+ }
+
+ scsi_wait_req(sr, cmd, buffer, buflength,
+ timeout * HZ, MAX_RETRIES);
+
+ dprintk("result: 0x%x\n",sr->sr_result);
+ if (driver_byte(sr->sr_result) & DRIVER_SENSE) {
+ if (debug)
+ scsi_print_req_sense(ch->name, sr);
+ errno = ch_find_errno(sr->sr_sense_buffer);
+
+ switch(sr->sr_sense_buffer[2] & 0xf) {
+ case UNIT_ATTENTION:
+ ch->unit_attention = 1;
+ if (retries++ < 3)
+ goto retry;
+ break;
+ }
+ }
+ scsi_release_request(sr);
+ return errno;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int
+ch_elem_to_typecode(scsi_changer *ch, u_int elem)
+{
+ int i;
+
+ for (i = 0; i < CH_TYPES; i++) {
+ if (elem >= ch->firsts[i] &&
+ elem < ch->firsts[i] +
+ ch->counts[i])
+ return i+1;
+ }
+ return 0;
+}
+
+static int
+ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
+{
+ u_char cmd[12];
+ u_char *buffer;
+ int result;
+
+ buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
+ if(!buffer)
+ return -ENOMEM;
+
+ retry:
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = READ_ELEMENT_STATUS;
+ cmd[1] = (ch->device->lun << 5) |
+ (ch->voltags ? 0x10 : 0) |
+ ch_elem_to_typecode(ch,elem);
+ cmd[2] = (elem >> 8) & 0xff;
+ cmd[3] = elem & 0xff;
+ cmd[5] = 1;
+ cmd[9] = 255;
+ if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
+ if (((buffer[16] << 8) | buffer[17]) != elem) {
+ dprintk("asked for element 0x%02x, got 0x%02x\n",
+ elem,(buffer[16] << 8) | buffer[17]);
+ kfree(buffer);
+ return -EIO;
+ }
+ memcpy(data,buffer+16,16);
+ } else {
+ if (ch->voltags) {
+ ch->voltags = 0;
+ vprintk("device has no volume tag support\n");
+ goto retry;
+ }
+ dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
+ }
+ kfree(buffer);
+ return result;
+}
+
+static int
+ch_init_elem(scsi_changer *ch)
+{
+ int err;
+ u_char cmd[6];
+
+ vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = INITIALIZE_ELEMENT_STATUS;
+ cmd[1] = ch->device->lun << 5;
+ err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
+ vprintk("... finished\n");
+ return err;
+}
+
+static int
+ch_readconfig(scsi_changer *ch)
+{
+ u_char cmd[10], data[16];
+ u_char *buffer;
+ int result,id,lun,i;
+ u_int elem;
+
+ buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
+ if (!buffer)
+ return -ENOMEM;
+ memset(buffer,0,512);
+
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = MODE_SENSE;
+ cmd[1] = ch->device->lun << 5;
+ cmd[2] = 0x1d;
+ cmd[4] = 255;
+ result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
+ if (0 != result) {
+ cmd[1] |= (1<<3);
+ result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
+ }
+ if (0 == result) {
+ ch->firsts[CHET_MT] =
+ (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
+ ch->counts[CHET_MT] =
+ (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
+ ch->firsts[CHET_ST] =
+ (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
+ ch->counts[CHET_ST] =
+ (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
+ ch->firsts[CHET_IE] =
+ (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
+ ch->counts[CHET_IE] =
+ (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
+ ch->firsts[CHET_DT] =
+ (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
+ ch->counts[CHET_DT] =
+ (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
+ vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
+ ch->firsts[CHET_MT],
+ ch->counts[CHET_MT]);
+ vprintk("type #2 (st): 0x%x+%d [storage]\n",
+ ch->firsts[CHET_ST],
+ ch->counts[CHET_ST]);
+ vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
+ ch->firsts[CHET_IE],
+ ch->counts[CHET_IE]);
+ vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
+ ch->firsts[CHET_DT],
+ ch->counts[CHET_DT]);
+ } else {
+ vprintk("reading element address assigment page failed!\n");
+ }
+
+ /* vendor specific element types */
+ for (i = 0; i < 4; i++) {
+ if (0 == vendor_counts[i])
+ continue;
+ if (NULL == vendor_labels[i])
+ continue;
+ ch->firsts[CHET_V1+i] = vendor_firsts[i];
+ ch->counts[CHET_V1+i] = vendor_counts[i];
+ vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
+ i+5,i+1,vendor_firsts[i],vendor_counts[i],
+ vendor_labels[i]);
+ }
+
+ /* look up the devices of the data transfer elements */
+ ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
+ GFP_KERNEL);
+ for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
+ id = -1;
+ lun = 0;
+ if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
+ id = dt_id[elem];
+ lun = dt_lun[elem];
+ vprintk("dt 0x%x: [insmod option] ",
+ elem+ch->firsts[CHET_DT]);
+ } else if (0 != ch_read_element_status
+ (ch,elem+ch->firsts[CHET_DT],data)) {
+ vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
+ elem+ch->firsts[CHET_DT]);
+ } else {
+ vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
+ if (data[6] & 0x80) {
+ if (verbose)
+ printk("not this SCSI bus\n");
+ ch->dt[elem] = NULL;
+ } else if (0 == (data[6] & 0x30)) {
+ if (verbose)
+ printk("ID/LUN unknown\n");
+ ch->dt[elem] = NULL;
+ } else {
+ id = ch->device->id;
+ lun = 0;
+ if (data[6] & 0x20) id = data[7];
+ if (data[6] & 0x10) lun = data[6] & 7;
+ }
+ }
+ if (-1 != id) {
+ if (verbose)
+ printk("ID %i, LUN %i, ",id,lun);
+ ch->dt[elem] =
+ scsi_device_lookup(ch->device->host,
+ ch->device->channel,
+ id,lun);
+ if (!ch->dt[elem]) {
+ /* should not happen */
+ if (verbose)
+ printk("Huh? device not found!\n");
+ } else {
+ if (verbose)
+ printk("name: %8.8s %16.16s %4.4s\n",
+ ch->dt[elem]->vendor,
+ ch->dt[elem]->model,
+ ch->dt[elem]->rev);
+ }
+ }
+ }
+ ch->voltags = 1;
+ kfree(buffer);
+
+ return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int
+ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
+{
+ u_char cmd[10];
+
+ dprintk("position: 0x%x\n",elem);
+ if (0 == trans)
+ trans = ch->firsts[CHET_MT];
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = POSITION_TO_ELEMENT;
+ cmd[1] = ch->device->lun << 5;
+ cmd[2] = (trans >> 8) & 0xff;
+ cmd[3] = trans & 0xff;
+ cmd[4] = (elem >> 8) & 0xff;
+ cmd[5] = elem & 0xff;
+ cmd[8] = rotate ? 1 : 0;
+ return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
+}
+
+static int
+ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
+{
+ u_char cmd[12];
+
+ dprintk("move: 0x%x => 0x%x\n",src,dest);
+ if (0 == trans)
+ trans = ch->firsts[CHET_MT];
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = MOVE_MEDIUM;
+ cmd[1] = ch->device->lun << 5;
+ cmd[2] = (trans >> 8) & 0xff;
+ cmd[3] = trans & 0xff;
+ cmd[4] = (src >> 8) & 0xff;
+ cmd[5] = src & 0xff;
+ cmd[6] = (dest >> 8) & 0xff;
+ cmd[7] = dest & 0xff;
+ cmd[10] = rotate ? 1 : 0;
+ return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
+}
+
+static int
+ch_exchange(scsi_changer *ch, u_int trans, u_int src,
+ u_int dest1, u_int dest2, int rotate1, int rotate2)
+{
+ u_char cmd[12];
+
+ dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
+ src,dest1,dest2);
+ if (0 == trans)
+ trans = ch->firsts[CHET_MT];
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = EXCHANGE_MEDIUM;
+ cmd[1] = ch->device->lun << 5;
+ cmd[2] = (trans >> 8) & 0xff;
+ cmd[3] = trans & 0xff;
+ cmd[4] = (src >> 8) & 0xff;
+ cmd[5] = src & 0xff;
+ cmd[6] = (dest1 >> 8) & 0xff;
+ cmd[7] = dest1 & 0xff;
+ cmd[8] = (dest2 >> 8) & 0xff;
+ cmd[9] = dest2 & 0xff;
+ cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
+
+ return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
+}
+
+static void
+ch_check_voltag(char *tag)
+{
+ int i;
+
+ for (i = 0; i < 32; i++) {
+ /* restrict to ascii */
+ if (tag[i] >= 0x7f || tag[i] < 0x20)
+ tag[i] = ' ';
+ /* don't allow search wildcards */
+ if (tag[i] == '?' ||
+ tag[i] == '*')
+ tag[i] = ' ';
+ }
+}
+
+static int
+ch_set_voltag(scsi_changer *ch, u_int elem,
+ int alternate, int clear, u_char *tag)
+{
+ u_char cmd[12];
+ u_char *buffer;
+ int result;
+
+ buffer = kmalloc(512, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+ memset(buffer,0,512);
+
+ dprintk("%s %s voltag: 0x%x => \"%s\"\n",
+ clear ? "clear" : "set",
+ alternate ? "alternate" : "primary",
+ elem, tag);
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = SEND_VOLUME_TAG;
+ cmd[1] = (ch->device->lun << 5) |
+ ch_elem_to_typecode(ch,elem);
+ cmd[2] = (elem >> 8) & 0xff;
+ cmd[3] = elem & 0xff;
+ cmd[5] = clear
+ ? (alternate ? 0x0d : 0x0c)
+ : (alternate ? 0x0b : 0x0a);
+
+ cmd[9] = 255;
+
+ memcpy(buffer,tag,32);
+ ch_check_voltag(buffer);
+
+ result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
+ kfree(buffer);
+ return result;
+}
+
+static int ch_gstatus(scsi_changer *ch, int type, unsigned char *dest)
+{
+ int retval = 0;
+ u_char data[16];
+ unsigned int i;
+
+ down(&ch->lock);
+ for (i = 0; i < ch->counts[type]; i++) {
+ if (0 != ch_read_element_status
+ (ch, ch->firsts[type]+i,data)) {
+ retval = -EIO;
+ break;
+ }
+ put_user(data[2], dest+i);
+ if (data[2] & CESTATUS_EXCEPT)
+ vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
+ ch->firsts[type]+i,
+ (int)data[4],(int)data[5]);
+ retval = ch_read_element_status
+ (ch, ch->firsts[type]+i,data);
+ if (0 != retval)
+ break;
+ }
+ up(&ch->lock);
+ return retval;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int
+ch_release(struct inode *inode, struct file *file)
+{
+ scsi_changer *ch = file->private_data;
+
+ scsi_device_put(ch->device);
+ file->private_data = NULL;
+ return 0;
+}
+
+static int
+ch_open(struct inode *inode, struct file *file)
+{
+ scsi_changer *tmp, *ch;
+ int minor = iminor(inode);
+
+ spin_lock(&ch_devlist_lock);
+ ch = NULL;
+ list_for_each_entry(tmp,&ch_devlist,list) {
+ if (tmp->minor == minor)
+ ch = tmp;
+ }
+ if (NULL == ch || scsi_device_get(ch->device)) {
+ spin_unlock(&ch_devlist_lock);
+ return -ENXIO;
+ }
+ spin_unlock(&ch_devlist_lock);
+
+ file->private_data = ch;
+ return 0;
+}
+
+static int
+ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
+{
+ if (type >= CH_TYPES || unit >= ch->counts[type])
+ return -1;
+ return 0;
+}
+
+static int ch_ioctl(struct inode * inode, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ scsi_changer *ch = file->private_data;
+ int retval;
+
+ switch (cmd) {
+ case CHIOGPARAMS:
+ {
+ struct changer_params params;
+
+ params.cp_curpicker = 0;
+ params.cp_npickers = ch->counts[CHET_MT];
+ params.cp_nslots = ch->counts[CHET_ST];
+ params.cp_nportals = ch->counts[CHET_IE];
+ params.cp_ndrives = ch->counts[CHET_DT];
+
+ if (copy_to_user((void *) arg, ¶ms, sizeof(params)))
+ return -EFAULT;
+ return 0;
+ }
+ case CHIOGVPARAMS:
+ {
+ struct changer_vendor_params vparams;
+
+ memset(&vparams,0,sizeof(vparams));
+ if (ch->counts[CHET_V1]) {
+ vparams.cvp_n1 = ch->counts[CHET_V1];
+ strncpy(vparams.cvp_label1,vendor_labels[0],16);
+ }
+ if (ch->counts[CHET_V2]) {
+ vparams.cvp_n2 = ch->counts[CHET_V2];
+ strncpy(vparams.cvp_label2,vendor_labels[1],16);
+ }
+ if (ch->counts[CHET_V3]) {
+ vparams.cvp_n3 = ch->counts[CHET_V3];
+ strncpy(vparams.cvp_label3,vendor_labels[2],16);
+ }
+ if (ch->counts[CHET_V4]) {
+ vparams.cvp_n4 = ch->counts[CHET_V4];
+ strncpy(vparams.cvp_label4,vendor_labels[3],16);
+ }
+ if (copy_to_user((void *) arg, &vparams, sizeof(vparams)))
+ return -EFAULT;
+ return 0;
+ }
+
+ case CHIOPOSITION:
+ {
+ struct changer_position pos;
+
+ if (copy_from_user(&pos, (void*)arg, sizeof (pos)))
+ return -EFAULT;
+
+ if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
+ dprintk("CHIOPOSITION: invalid parameter\n");
+ return -EBADSLT;
+ }
+ down(&ch->lock);
+ retval = ch_position(ch,0,
+ ch->firsts[pos.cp_type] + pos.cp_unit,
+ pos.cp_flags & CP_INVERT);
+ up(&ch->lock);
+ return retval;
+ }
+
+ case CHIOMOVE:
+ {
+ struct changer_move mv;
+
+ if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
+ return -EFAULT;
+
+ if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
+ 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
+ dprintk("CHIOMOVE: invalid parameter\n");
+ return -EBADSLT;
+ }
+
+ down(&ch->lock);
+ retval = ch_move(ch,0,
+ ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
+ ch->firsts[mv.cm_totype] + mv.cm_tounit,
+ mv.cm_flags & CM_INVERT);
+ up(&ch->lock);
+ return retval;
+ }
+
+ case CHIOEXCHANGE:
+ {
+ struct changer_exchange mv;
+
+ if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
+ return -EFAULT;
+
+ if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
+ 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
+ 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
+ dprintk("CHIOEXCHANGE: invalid parameter\n");
+ return -EBADSLT;
+ }
+
+ down(&ch->lock);
+ retval = ch_exchange
+ (ch,0,
+ ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
+ ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
+ ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
+ mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
+ up(&ch->lock);
+ return retval;
+ }
+
+ case CHIOGSTATUS:
+ {
+ struct changer_element_status ces;
+
+ if (copy_from_user(&ces, (void*)arg, sizeof (ces)))
+ return -EFAULT;
+ if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
+ return -EINVAL;
+
+ return ch_gstatus(ch, ces.ces_type, ces.ces_data);
+ }
+
+ case CHIOGELEM:
+ {
+ struct changer_get_element cge;
+ u_char cmd[12];
+ u_char *buffer;
+ unsigned int elem;
+ int result,i;
+
+ if (copy_from_user(&cge, (void*)arg, sizeof (cge)))
+ return -EFAULT;
+
+ if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
+ return -EINVAL;
+ elem = ch->firsts[cge.cge_type] + cge.cge_unit;
+
+ buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
+ if (!buffer)
+ return -ENOMEM;
+ down(&ch->lock);
+
+ voltag_retry:
+ memset(cmd,0,sizeof(cmd));
+ cmd[0] = READ_ELEMENT_STATUS;
+ cmd[1] = (ch->device->lun << 5) |
+ (ch->voltags ? 0x10 : 0) |
+ ch_elem_to_typecode(ch,elem);
+ cmd[2] = (elem >> 8) & 0xff;
+ cmd[3] = elem & 0xff;
+ cmd[5] = 1;
+ cmd[9] = 255;
+
+ if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
+ cge.cge_status = buffer[18];
+ cge.cge_flags = 0;
+ if (buffer[18] & CESTATUS_EXCEPT) {
+ cge.cge_errno = EIO;
+ }
+ if (buffer[25] & 0x80) {
+ cge.cge_flags |= CGE_SRC;
+ if (buffer[25] & 0x40)
+ cge.cge_flags |= CGE_INVERT;
+ elem = (buffer[26]<<8) | buffer[27];
+ for (i = 0; i < 4; i++) {
+ if (elem >= ch->firsts[i] &&
+ elem < ch->firsts[i] + ch->counts[i]) {
+ cge.cge_srctype = i;
+ cge.cge_srcunit = elem-ch->firsts[i];
+ }
+ }
+ }
+ if ((buffer[22] & 0x30) == 0x30) {
+ cge.cge_flags |= CGE_IDLUN;
+ cge.cge_id = buffer[23];
+ cge.cge_lun = buffer[22] & 7;
+ }
+ if (buffer[9] & 0x80) {
+ cge.cge_flags |= CGE_PVOLTAG;
+ memcpy(cge.cge_pvoltag,buffer+28,36);
+ }
+ if (buffer[9] & 0x40) {
+ cge.cge_flags |= CGE_AVOLTAG;
+ memcpy(cge.cge_avoltag,buffer+64,36);
+ }
+ } else if (ch->voltags) {
+ ch->voltags = 0;
+ vprintk("device has no volume tag support\n");
+ goto voltag_retry;
+ }
+ kfree(buffer);
+ up(&ch->lock);
+
+ if (copy_to_user((void*)arg, &cge, sizeof (cge)))
+ return -EFAULT;
+ return result;
+ }
+
+ case CHIOINITELEM:
+ {
+ down(&ch->lock);
+ retval = ch_init_elem(ch);
+ up(&ch->lock);
+ return retval;
+ }
+
+ case CHIOSVOLTAG:
+ {
+ struct changer_set_voltag csv;
+ int elem;
+
+ if (copy_from_user(&csv, (void*)arg, sizeof(csv)))
+ return -EFAULT;
+
+ if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
+ dprintk("CHIOSVOLTAG: invalid parameter\n");
+ return -EBADSLT;
+ }
+ elem = ch->firsts[csv.csv_type] + csv.csv_unit;
+ down(&ch->lock);
+ retval = ch_set_voltag(ch, elem,
+ csv.csv_flags & CSV_AVOLTAG,
+ csv.csv_flags & CSV_CLEARTAG,
+ csv.csv_voltag);
+ up(&ch->lock);
+ return retval;
+ }
+
+ default:
+ return scsi_ioctl(ch->device, cmd, (void*)arg);
+
+ }
+}
+
+#ifdef CONFIG_COMPAT
+
+struct changer_element_status32 {
+ int ces_type;
+ compat_uptr_t ces_data;
+};
+#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
+
+static long ch_ioctl_compat(struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ scsi_changer *ch = file->private_data;
+
+ switch (cmd) {
+ case CHIOGPARAMS:
+ case CHIOGVPARAMS:
+ case CHIOPOSITION:
+ case CHIOMOVE:
+ case CHIOEXCHANGE:
+ case CHIOGELEM:
+ case CHIOINITELEM:
+ case CHIOSVOLTAG:
+ /* compatible */
+ return ch_ioctl(NULL /* inode, unused */,
+ file, cmd, arg);
+ case CHIOGSTATUS32:
+ {
+ struct changer_element_status32 ces32;
+ unsigned char *data;
+
+ if (copy_from_user(&ces32, (void*)arg, sizeof (ces32)))
+ return -EFAULT;
+ if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
+ return -EINVAL;
+
+ data = compat_ptr(ces32.ces_data);
+ return ch_gstatus(ch, ces32.ces_type, data);
+ }
+ default:
+ // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
+ return -ENOIOCTLCMD;
+
+ }
+}
+#endif
+
+/* ------------------------------------------------------------------------ */
+
+static int ch_probe(struct device *dev)
+{
+ struct scsi_device *sd = to_scsi_device(dev);
+ scsi_changer *ch;
+
+ if (sd->type != TYPE_MEDIUM_CHANGER)
+ return -ENODEV;
+
+ ch = kmalloc(sizeof(*ch), GFP_KERNEL);
+ if (NULL == ch)
+ return -ENOMEM;
+
+ memset(ch,0,sizeof(*ch));
+ ch->minor = ch_devcount;
+ sprintf(ch->name,"ch%d",ch->minor);
+ init_MUTEX(&ch->lock);
+ ch->device = sd;
+ ch_readconfig(ch);
+ if (init)
+ ch_init_elem(ch);
+
+ devfs_mk_cdev(MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
+ S_IFCHR | S_IRUGO | S_IWUGO, ch->name);
+ class_simple_device_add(ch_sysfs_class,
+ MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
+ dev, "s%s", ch->name);
+
+ printk(KERN_INFO "Attached scsi changer %s "
+ "at scsi%d, channel %d, id %d, lun %d\n",
+ ch->name, sd->host->host_no, sd->channel, sd->id, sd->lun);
+
+ spin_lock(&ch_devlist_lock);
+ list_add_tail(&ch->list,&ch_devlist);
+ ch_devcount++;
+ spin_unlock(&ch_devlist_lock);
+ return 0;
+}
+
+static int ch_remove(struct device *dev)
+{
+ struct scsi_device *sd = to_scsi_device(dev);
+ scsi_changer *tmp, *ch;
+
+ spin_lock(&ch_devlist_lock);
+ ch = NULL;
+ list_for_each_entry(tmp,&ch_devlist,list) {
+ if (tmp->device == sd)
+ ch = tmp;
+ }
+ BUG_ON(NULL == ch);
+ list_del(&ch->list);
+ spin_unlock(&ch_devlist_lock);
+
+ class_simple_device_remove(MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
+ devfs_remove(ch->name);
+ kfree(ch->dt);
+ kfree(ch);
+ ch_devcount--;
+ return 0;
+}
+
+static int __init init_ch_module(void)
+{
+ int rc;
+
+ printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
+ ch_sysfs_class = class_simple_create(THIS_MODULE, "scsi_changer");
+ if (IS_ERR(ch_sysfs_class)) {
+ rc = PTR_ERR(ch_sysfs_class);
+ return rc;
+ }
+ rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
+ if (rc < 0) {
+ printk("Unable to get major %d for SCSI-Changer\n",
+ SCSI_CHANGER_MAJOR);
+ goto fail1;
+ }
+ rc = scsi_register_driver(&ch_template.gendrv);
+ if (rc < 0)
+ goto fail2;
+ return 0;
+
+ fail2:
+ unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
+ fail1:
+ class_simple_destroy(ch_sysfs_class);
+ return rc;
+}
+
+static void __exit exit_ch_module(void)
+{
+ scsi_unregister_driver(&ch_template.gendrv);
+ unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
+ class_simple_destroy(ch_sysfs_class);
+}
+
+module_init(init_ch_module);
+module_exit(exit_ch_module);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff