/* * SCSI Media Changer device driver for Linux 2.6 * * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org> * */ #define VERSION "0.25" #include <linux/module.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/kernel.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/compat.h> #include <linux/chio.h> /* here are all the ioctls */ #include <linux/mutex.h> #include <linux/idr.h> #include <linux/slab.h> #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_eh.h> #include <scsi/scsi_dbg.h> #define CH_DT_MAX 16 #define CH_TYPES 8 #define CH_MAX_DEVS 128 MODULE_DESCRIPTION("device driver for scsi media changer devices"); MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>"); MODULE_LICENSE("GPL"); MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR); MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER); static DEFINE_MUTEX(ch_mutex); 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 const char * vendor_labels[CH_TYPES-4] = { "v0", "v1", "v2", "v3" }; // module_param_string_array(vendor_labels, NULL, 0444); #define ch_printk(prefix, ch, fmt, a...) \ sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a) #define DPRINTK(fmt, arg...) \ do { \ if (debug) \ ch_printk(KERN_DEBUG, ch, fmt, ##arg); \ } while (0) #define VPRINTK(level, fmt, arg...) \ do { \ if (verbose) \ ch_printk(level, ch, fmt, ##arg); \ } while (0) /* ------------------------------------------------------------------- */ #define MAX_RETRIES 1 static struct class * ch_sysfs_class; typedef struct { struct kref ref; 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 mutex lock; } scsi_changer; static DEFINE_IDR(ch_index_idr); static DEFINE_SPINLOCK(ch_index_lock); static const struct { unsigned char sense; unsigned char asc; unsigned char ascq; int errno; } ch_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(struct scsi_sense_hdr *sshdr) { int i,errno = 0; /* Check to see if additional sense information is available */ if (scsi_sense_valid(sshdr) && sshdr->asc != 0) { for (i = 0; ch_err[i].errno != 0; i++) { if (ch_err[i].sense == sshdr->sense_key && ch_err[i].asc == sshdr->asc && ch_err[i].ascq == sshdr->ascq) { errno = -ch_err[i].errno; break; } } } if (errno == 0) errno = -EIO; return errno; } static int ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len, void *buffer, unsigned buflength, enum dma_data_direction direction) { int errno, retries = 0, timeout, result; struct scsi_sense_hdr sshdr; timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) ? timeout_init : timeout_move; retry: errno = 0; result = scsi_execute_req(ch->device, cmd, direction, buffer, buflength, &sshdr, timeout * HZ, MAX_RETRIES, NULL); if (driver_byte(result) & DRIVER_SENSE) { if (debug) scsi_print_sense_hdr(ch->device, ch->name, &sshdr); errno = ch_find_errno(&sshdr); switch(sshdr.sense_key) { case UNIT_ATTENTION: ch->unit_attention = 1; if (retries++ < 3) goto retry; break; } } 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 & 0x7) << 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, 12, 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(KERN_INFO, "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(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n"); memset(cmd,0,sizeof(cmd)); cmd[0] = INITIALIZE_ELEMENT_STATUS; cmd[1] = (ch->device->lun & 0x7) << 5; err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE); VPRINTK(KERN_INFO, "... 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 = kzalloc(512, GFP_KERNEL | GFP_DMA); if (!buffer) return -ENOMEM; memset(cmd,0,sizeof(cmd)); cmd[0] = MODE_SENSE; cmd[1] = (ch->device->lun & 0x7) << 5; cmd[2] = 0x1d; cmd[4] = 255; result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE); if (0 != result) { cmd[1] |= (1<<3); result = ch_do_scsi(ch, cmd, 10, 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(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n", ch->firsts[CHET_MT], ch->counts[CHET_MT]); VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", ch->firsts[CHET_ST], ch->counts[CHET_ST]); VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", ch->firsts[CHET_IE], ch->counts[CHET_IE]); VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", ch->firsts[CHET_DT], ch->counts[CHET_DT]); } else { VPRINTK(KERN_INFO, "reading element address assignment 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(KERN_INFO, "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 = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt), GFP_KERNEL); if (!ch->dt) { kfree(buffer); return -ENOMEM; } 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(KERN_INFO, "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(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n", elem+ch->firsts[CHET_DT]); } else { VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]); if (data[6] & 0x80) { VPRINTK(KERN_CONT, "not this SCSI bus\n"); ch->dt[elem] = NULL; } else if (0 == (data[6] & 0x30)) { VPRINTK(KERN_CONT, "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) { VPRINTK(KERN_CONT, "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 */ VPRINTK(KERN_CONT, "Huh? device not found!\n"); } else { VPRINTK(KERN_CONT, "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 & 0x7) << 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, 10, 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 & 0x7) << 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, 12, 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 & 0x7) << 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, 12, 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 = kzalloc(512, GFP_KERNEL); if (!buffer) return -ENOMEM; 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 & 0x7) << 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, 12, buffer, 256, DMA_TO_DEVICE); kfree(buffer); return result; } static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) { int retval = 0; u_char data[16]; unsigned int i; mutex_lock(&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(KERN_INFO, "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; } mutex_unlock(&ch->lock); return retval; } /* ------------------------------------------------------------------------ */ static void ch_destroy(struct kref *ref) { scsi_changer *ch = container_of(ref, scsi_changer, ref); kfree(ch->dt); kfree(ch); } static int ch_release(struct inode *inode, struct file *file) { scsi_changer *ch = file->private_data; scsi_device_put(ch->device); ch->device = NULL; file->private_data = NULL; kref_put(&ch->ref, ch_destroy); return 0; } static int ch_open(struct inode *inode, struct file *file) { scsi_changer *ch; int minor = iminor(inode); mutex_lock(&ch_mutex); spin_lock(&ch_index_lock); ch = idr_find(&ch_index_idr, minor); if (NULL == ch || scsi_device_get(ch->device)) { spin_unlock(&ch_index_lock); mutex_unlock(&ch_mutex); return -ENXIO; } kref_get(&ch->ref); spin_unlock(&ch_index_lock); file->private_data = ch; mutex_unlock(&ch_mutex); 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 long ch_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { scsi_changer *ch = file->private_data; int retval; void __user *argp = (void __user *)arg; retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, file->f_flags & O_NDELAY); if (retval) return 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(argp, ¶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(argp, &vparams, sizeof(vparams))) return -EFAULT; return 0; } case CHIOPOSITION: { struct changer_position pos; if (copy_from_user(&pos, argp, sizeof (pos))) return -EFAULT; if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { DPRINTK("CHIOPOSITION: invalid parameter\n"); return -EBADSLT; } mutex_lock(&ch->lock); retval = ch_position(ch,0, ch->firsts[pos.cp_type] + pos.cp_unit, pos.cp_flags & CP_INVERT); mutex_unlock(&ch->lock); return retval; } case CHIOMOVE: { struct changer_move mv; if (copy_from_user(&mv, argp, 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; } mutex_lock(&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); mutex_unlock(&ch->lock); return retval; } case CHIOEXCHANGE: { struct changer_exchange mv; if (copy_from_user(&mv, argp, 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; } mutex_lock(&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); mutex_unlock(&ch->lock); return retval; } case CHIOGSTATUS: { struct changer_element_status ces; if (copy_from_user(&ces, argp, 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 ch_cmd[12]; u_char *buffer; unsigned int elem; int result,i; if (copy_from_user(&cge, argp, 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; mutex_lock(&ch->lock); voltag_retry: memset(ch_cmd, 0, sizeof(ch_cmd)); ch_cmd[0] = READ_ELEMENT_STATUS; ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | (ch->voltags ? 0x10 : 0) | ch_elem_to_typecode(ch,elem); ch_cmd[2] = (elem >> 8) & 0xff; ch_cmd[3] = elem & 0xff; ch_cmd[5] = 1; ch_cmd[9] = 255; result = ch_do_scsi(ch, ch_cmd, 12, buffer, 256, DMA_FROM_DEVICE); if (!result) { 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(KERN_INFO, "device has no volume tag support\n"); goto voltag_retry; } kfree(buffer); mutex_unlock(&ch->lock); if (copy_to_user(argp, &cge, sizeof (cge))) return -EFAULT; return result; } case CHIOINITELEM: { mutex_lock(&ch->lock); retval = ch_init_elem(ch); mutex_unlock(&ch->lock); return retval; } case CHIOSVOLTAG: { struct changer_set_voltag csv; int elem; if (copy_from_user(&csv, argp, 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; mutex_lock(&ch->lock); retval = ch_set_voltag(ch, elem, csv.csv_flags & CSV_AVOLTAG, csv.csv_flags & CSV_CLEARTAG, csv.csv_voltag); mutex_unlock(&ch->lock); return retval; } default: return scsi_ioctl(ch->device, cmd, argp); } } #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(file, cmd, arg); case CHIOGSTATUS32: { struct changer_element_status32 ces32; unsigned char __user *data; if (copy_from_user(&ces32, (void __user *)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); struct device *class_dev; int ret; scsi_changer *ch; if (sd->type != TYPE_MEDIUM_CHANGER) return -ENODEV; ch = kzalloc(sizeof(*ch), GFP_KERNEL); if (NULL == ch) return -ENOMEM; idr_preload(GFP_KERNEL); spin_lock(&ch_index_lock); ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); spin_unlock(&ch_index_lock); idr_preload_end(); if (ret < 0) { if (ret == -ENOSPC) ret = -ENODEV; goto free_ch; } ch->minor = ret; sprintf(ch->name,"ch%d",ch->minor); class_dev = device_create(ch_sysfs_class, dev, MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, "s%s", ch->name); if (IS_ERR(class_dev)) { sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", ch->minor); ret = PTR_ERR(class_dev); goto remove_idr; } mutex_init(&ch->lock); kref_init(&ch->ref); ch->device = sd; ret = ch_readconfig(ch); if (ret) goto destroy_dev; if (init) ch_init_elem(ch); dev_set_drvdata(dev, ch); sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); return 0; destroy_dev: device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); remove_idr: idr_remove(&ch_index_idr, ch->minor); free_ch: kfree(ch); return ret; } static int ch_remove(struct device *dev) { scsi_changer *ch = dev_get_drvdata(dev); spin_lock(&ch_index_lock); idr_remove(&ch_index_idr, ch->minor); spin_unlock(&ch_index_lock); device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); kref_put(&ch->ref, ch_destroy); return 0; } static struct scsi_driver ch_template = { .gendrv = { .name = "ch", .owner = THIS_MODULE, .probe = ch_probe, .remove = ch_remove, }, }; static const struct file_operations changer_fops = { .owner = THIS_MODULE, .open = ch_open, .release = ch_release, .unlocked_ioctl = ch_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = ch_ioctl_compat, #endif .llseek = noop_llseek, }; static int __init init_ch_module(void) { int rc; printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); ch_sysfs_class = class_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_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_destroy(ch_sysfs_class); idr_destroy(&ch_index_idr); } module_init(init_ch_module); module_exit(exit_ch_module); /* * Local variables: * c-basic-offset: 8 * End: */