linux/drivers/cdrom/viocd.c
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   1/* -*- linux-c -*-
   2 *  drivers/cdrom/viocd.c
   3 *
   4 *  iSeries Virtual CD Rom
   5 *
   6 *  Authors: Dave Boutcher <boutcher@us.ibm.com>
   7 *           Ryan Arnold <ryanarn@us.ibm.com>
   8 *           Colin Devilbiss <devilbis@us.ibm.com>
   9 *           Stephen Rothwell
  10 *
  11 * (C) Copyright 2000-2004 IBM Corporation
  12 *
  13 * This program is free software;  you can redistribute it and/or
  14 * modify it under the terms of the GNU General Public License as
  15 * published by the Free Software Foundation; either version 2 of the
  16 * License, or (at your option) anyu later version.
  17 *
  18 * This program is distributed in the hope that it will be useful, but
  19 * WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 * General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software Foundation,
  25 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26 *
  27 * This routine provides access to CD ROM drives owned and managed by an
  28 * OS/400 partition running on the same box as this Linux partition.
  29 *
  30 * All operations are performed by sending messages back and forth to
  31 * the OS/400 partition.
  32 */
  33
  34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36#include <linux/major.h>
  37#include <linux/blkdev.h>
  38#include <linux/cdrom.h>
  39#include <linux/errno.h>
  40#include <linux/init.h>
  41#include <linux/dma-mapping.h>
  42#include <linux/module.h>
  43#include <linux/completion.h>
  44#include <linux/proc_fs.h>
  45#include <linux/mutex.h>
  46#include <linux/seq_file.h>
  47#include <linux/scatterlist.h>
  48
  49#include <asm/vio.h>
  50#include <asm/iseries/hv_types.h>
  51#include <asm/iseries/hv_lp_event.h>
  52#include <asm/iseries/vio.h>
  53#include <asm/firmware.h>
  54
  55#define VIOCD_DEVICE                    "iseries/vcd"
  56
  57#define VIOCD_VERS "1.06"
  58
  59/*
  60 * Should probably make this a module parameter....sigh
  61 */
  62#define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  63
  64static DEFINE_MUTEX(viocd_mutex);
  65static const struct vio_error_entry viocd_err_table[] = {
  66        {0x0201, EINVAL, "Invalid Range"},
  67        {0x0202, EINVAL, "Invalid Token"},
  68        {0x0203, EIO, "DMA Error"},
  69        {0x0204, EIO, "Use Error"},
  70        {0x0205, EIO, "Release Error"},
  71        {0x0206, EINVAL, "Invalid CD"},
  72        {0x020C, EROFS, "Read Only Device"},
  73        {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  74        {0x020E, EIO, "Optical System Error (Varied Off?)"},
  75        {0x02FF, EIO, "Internal Error"},
  76        {0x3010, EIO, "Changed Volume"},
  77        {0xC100, EIO, "Optical System Error"},
  78        {0x0000, 0, NULL},
  79};
  80
  81/*
  82 * This is the structure we use to exchange info between driver and interrupt
  83 * handler
  84 */
  85struct viocd_waitevent {
  86        struct completion       com;
  87        int                     rc;
  88        u16                     sub_result;
  89        int                     changed;
  90};
  91
  92/* this is a lookup table for the true capabilities of a device */
  93struct capability_entry {
  94        char    *type;
  95        int     capability;
  96};
  97
  98static struct capability_entry capability_table[] __initdata = {
  99        { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 100        { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 101        { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 102        { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 103        { "6321", CDC_LOCK },
 104        { "632B", 0 },
 105        { NULL  , CDC_LOCK },
 106};
 107
 108/* These are our internal structures for keeping track of devices */
 109static int viocd_numdev;
 110
 111struct disk_info {
 112        struct gendisk                  *viocd_disk;
 113        struct cdrom_device_info        viocd_info;
 114        struct device                   *dev;
 115        const char                      *rsrcname;
 116        const char                      *type;
 117        const char                      *model;
 118};
 119static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 120
 121#define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 122
 123static spinlock_t viocd_reqlock;
 124
 125#define MAX_CD_REQ      1
 126
 127/* procfs support */
 128static int proc_viocd_show(struct seq_file *m, void *v)
 129{
 130        int i;
 131
 132        for (i = 0; i < viocd_numdev; i++) {
 133                seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 134                                "type %4.4s, model %3.3s\n",
 135                                i, viocd_diskinfo[i].rsrcname,
 136                                viocd_diskinfo[i].type,
 137                                viocd_diskinfo[i].model);
 138        }
 139        return 0;
 140}
 141
 142static int proc_viocd_open(struct inode *inode, struct file *file)
 143{
 144        return single_open(file, proc_viocd_show, NULL);
 145}
 146
 147static const struct file_operations proc_viocd_operations = {
 148        .owner          = THIS_MODULE,
 149        .open           = proc_viocd_open,
 150        .read           = seq_read,
 151        .llseek         = seq_lseek,
 152        .release        = single_release,
 153};
 154
 155static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 156{
 157        struct disk_info *di = bdev->bd_disk->private_data;
 158        int ret;
 159
 160        mutex_lock(&viocd_mutex);
 161        ret = cdrom_open(&di->viocd_info, bdev, mode);
 162        mutex_unlock(&viocd_mutex);
 163
 164        return ret;
 165}
 166
 167static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
 168{
 169        struct disk_info *di = disk->private_data;
 170        mutex_lock(&viocd_mutex);
 171        cdrom_release(&di->viocd_info, mode);
 172        mutex_unlock(&viocd_mutex);
 173        return 0;
 174}
 175
 176static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
 177                unsigned cmd, unsigned long arg)
 178{
 179        struct disk_info *di = bdev->bd_disk->private_data;
 180        int ret;
 181
 182        mutex_lock(&viocd_mutex);
 183        ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
 184        mutex_unlock(&viocd_mutex);
 185
 186        return ret;
 187}
 188
 189static unsigned int viocd_blk_check_events(struct gendisk *disk,
 190                                           unsigned int clearing)
 191{
 192        struct disk_info *di = disk->private_data;
 193        return cdrom_check_events(&di->viocd_info, clearing);
 194}
 195
 196static const struct block_device_operations viocd_fops = {
 197        .owner =                THIS_MODULE,
 198        .open =                 viocd_blk_open,
 199        .release =              viocd_blk_release,
 200        .ioctl =                viocd_blk_ioctl,
 201        .check_events =         viocd_blk_check_events,
 202};
 203
 204static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 205{
 206        struct disk_info *diskinfo = cdi->handle;
 207        int device_no = DEVICE_NR(diskinfo);
 208        HvLpEvent_Rc hvrc;
 209        struct viocd_waitevent we;
 210
 211        init_completion(&we.com);
 212        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 213                        HvLpEvent_Type_VirtualIo,
 214                        viomajorsubtype_cdio | viocdopen,
 215                        HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 216                        viopath_sourceinst(viopath_hostLp),
 217                        viopath_targetinst(viopath_hostLp),
 218                        (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 219                        0, 0, 0);
 220        if (hvrc != 0) {
 221                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 222                           (int)hvrc);
 223                return -EIO;
 224        }
 225
 226        wait_for_completion(&we.com);
 227
 228        if (we.rc) {
 229                const struct vio_error_entry *err =
 230                        vio_lookup_rc(viocd_err_table, we.sub_result);
 231                pr_warning("bad rc %d:0x%04X on open: %s\n",
 232                           we.rc, we.sub_result, err->msg);
 233                return -err->errno;
 234        }
 235
 236        return 0;
 237}
 238
 239static void viocd_release(struct cdrom_device_info *cdi)
 240{
 241        int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 242        HvLpEvent_Rc hvrc;
 243
 244        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 245                        HvLpEvent_Type_VirtualIo,
 246                        viomajorsubtype_cdio | viocdclose,
 247                        HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 248                        viopath_sourceinst(viopath_hostLp),
 249                        viopath_targetinst(viopath_hostLp), 0,
 250                        VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 251        if (hvrc != 0)
 252                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 253                           (int)hvrc);
 254}
 255
 256/* Send a read or write request to OS/400 */
 257static int send_request(struct request *req)
 258{
 259        HvLpEvent_Rc hvrc;
 260        struct disk_info *diskinfo = req->rq_disk->private_data;
 261        u64 len;
 262        dma_addr_t dmaaddr;
 263        int direction;
 264        u16 cmd;
 265        struct scatterlist sg;
 266
 267        BUG_ON(req->nr_phys_segments > 1);
 268
 269        if (rq_data_dir(req) == READ) {
 270                direction = DMA_FROM_DEVICE;
 271                cmd = viomajorsubtype_cdio | viocdread;
 272        } else {
 273                direction = DMA_TO_DEVICE;
 274                cmd = viomajorsubtype_cdio | viocdwrite;
 275        }
 276
 277        sg_init_table(&sg, 1);
 278        if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 279                pr_warning("error setting up scatter/gather list\n");
 280                return -1;
 281        }
 282
 283        if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 284                pr_warning("error allocating sg tce\n");
 285                return -1;
 286        }
 287        dmaaddr = sg_dma_address(&sg);
 288        len = sg_dma_len(&sg);
 289
 290        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 291                        HvLpEvent_Type_VirtualIo, cmd,
 292                        HvLpEvent_AckInd_DoAck,
 293                        HvLpEvent_AckType_ImmediateAck,
 294                        viopath_sourceinst(viopath_hostLp),
 295                        viopath_targetinst(viopath_hostLp),
 296                        (u64)req, VIOVERSION << 16,
 297                        ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 298                        (u64)blk_rq_pos(req) * 512, len, 0);
 299        if (hvrc != HvLpEvent_Rc_Good) {
 300                pr_warning("hv error on op %d\n", (int)hvrc);
 301                return -1;
 302        }
 303
 304        return 0;
 305}
 306
 307static int rwreq;
 308
 309static void do_viocd_request(struct request_queue *q)
 310{
 311        struct request *req;
 312
 313        while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
 314                if (req->cmd_type != REQ_TYPE_FS)
 315                        __blk_end_request_all(req, -EIO);
 316                else if (send_request(req) < 0) {
 317                        pr_warning("unable to send message to OS/400!\n");
 318                        __blk_end_request_all(req, -EIO);
 319                } else
 320                        rwreq++;
 321        }
 322}
 323
 324static unsigned int viocd_check_events(struct cdrom_device_info *cdi,
 325                                       unsigned int clearing, int disc_nr)
 326{
 327        struct viocd_waitevent we;
 328        HvLpEvent_Rc hvrc;
 329        int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 330
 331        init_completion(&we.com);
 332
 333        /* Send the open event to OS/400 */
 334        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 335                        HvLpEvent_Type_VirtualIo,
 336                        viomajorsubtype_cdio | viocdcheck,
 337                        HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 338                        viopath_sourceinst(viopath_hostLp),
 339                        viopath_targetinst(viopath_hostLp),
 340                        (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 341                        0, 0, 0);
 342        if (hvrc != 0) {
 343                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 344                           (int)hvrc);
 345                return 0;
 346        }
 347
 348        wait_for_completion(&we.com);
 349
 350        /* Check the return code.  If bad, assume no change */
 351        if (we.rc) {
 352                const struct vio_error_entry *err =
 353                        vio_lookup_rc(viocd_err_table, we.sub_result);
 354                pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 355                           we.rc, we.sub_result, err->msg);
 356                return 0;
 357        }
 358
 359        return we.changed ? DISK_EVENT_MEDIA_CHANGE : 0;
 360}
 361
 362static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 363{
 364        HvLpEvent_Rc hvrc;
 365        u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 366        /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 367        u64 flags = !!locking;
 368        struct viocd_waitevent we;
 369
 370        init_completion(&we.com);
 371
 372        /* Send the lockdoor event to OS/400 */
 373        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 374                        HvLpEvent_Type_VirtualIo,
 375                        viomajorsubtype_cdio | viocdlockdoor,
 376                        HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 377                        viopath_sourceinst(viopath_hostLp),
 378                        viopath_targetinst(viopath_hostLp),
 379                        (u64)&we, VIOVERSION << 16,
 380                        (device_no << 48) | (flags << 32), 0, 0, 0);
 381        if (hvrc != 0) {
 382                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 383                           (int)hvrc);
 384                return -EIO;
 385        }
 386
 387        wait_for_completion(&we.com);
 388
 389        if (we.rc != 0)
 390                return -EIO;
 391        return 0;
 392}
 393
 394static int viocd_packet(struct cdrom_device_info *cdi,
 395                struct packet_command *cgc)
 396{
 397        unsigned int buflen = cgc->buflen;
 398        int ret = -EIO;
 399
 400        switch (cgc->cmd[0]) {
 401        case GPCMD_READ_DISC_INFO:
 402                {
 403                        disc_information *di = (disc_information *)cgc->buffer;
 404
 405                        if (buflen >= 2) {
 406                                di->disc_information_length = cpu_to_be16(1);
 407                                ret = 0;
 408                        }
 409                        if (buflen >= 3)
 410                                di->erasable =
 411                                        (cdi->ops->capability & ~cdi->mask
 412                                         & (CDC_DVD_RAM | CDC_RAM)) != 0;
 413                }
 414                break;
 415        case GPCMD_GET_CONFIGURATION:
 416                if (cgc->cmd[3] == CDF_RWRT) {
 417                        struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 418
 419                        if ((buflen >=
 420                             (sizeof(struct feature_header) + sizeof(*rfd))) &&
 421                            (cdi->ops->capability & ~cdi->mask
 422                             & (CDC_DVD_RAM | CDC_RAM))) {
 423                                rfd->feature_code = cpu_to_be16(CDF_RWRT);
 424                                rfd->curr = 1;
 425                                ret = 0;
 426                        }
 427                }
 428                break;
 429        default:
 430                if (cgc->sense) {
 431                        /* indicate Unknown code */
 432                        cgc->sense->sense_key = 0x05;
 433                        cgc->sense->asc = 0x20;
 434                        cgc->sense->ascq = 0x00;
 435                }
 436                break;
 437        }
 438
 439        cgc->stat = ret;
 440        return ret;
 441}
 442
 443static void restart_all_queues(int first_index)
 444{
 445        int i;
 446
 447        for (i = first_index + 1; i < viocd_numdev; i++)
 448                if (viocd_diskinfo[i].viocd_disk)
 449                        blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 450        for (i = 0; i <= first_index; i++)
 451                if (viocd_diskinfo[i].viocd_disk)
 452                        blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 453}
 454
 455/* This routine handles incoming CD LP events */
 456static void vio_handle_cd_event(struct HvLpEvent *event)
 457{
 458        struct viocdlpevent *bevent;
 459        struct viocd_waitevent *pwe;
 460        struct disk_info *di;
 461        unsigned long flags;
 462        struct request *req;
 463
 464
 465        if (event == NULL)
 466                /* Notification that a partition went away! */
 467                return;
 468        /* First, we should NEVER get an int here...only acks */
 469        if (hvlpevent_is_int(event)) {
 470                pr_warning("Yikes! got an int in viocd event handler!\n");
 471                if (hvlpevent_need_ack(event)) {
 472                        event->xRc = HvLpEvent_Rc_InvalidSubtype;
 473                        HvCallEvent_ackLpEvent(event);
 474                }
 475        }
 476
 477        bevent = (struct viocdlpevent *)event;
 478
 479        switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 480        case viocdopen:
 481                if (event->xRc == 0) {
 482                        di = &viocd_diskinfo[bevent->disk];
 483                        blk_queue_logical_block_size(di->viocd_disk->queue,
 484                                                     bevent->block_size);
 485                        set_capacity(di->viocd_disk,
 486                                        bevent->media_size *
 487                                        bevent->block_size / 512);
 488                }
 489                /* FALLTHROUGH !! */
 490        case viocdlockdoor:
 491                pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 492return_complete:
 493                pwe->rc = event->xRc;
 494                pwe->sub_result = bevent->sub_result;
 495                complete(&pwe->com);
 496                break;
 497
 498        case viocdcheck:
 499                pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 500                pwe->changed = bevent->flags;
 501                goto return_complete;
 502
 503        case viocdclose:
 504                break;
 505
 506        case viocdwrite:
 507        case viocdread:
 508                /*
 509                 * Since this is running in interrupt mode, we need to
 510                 * make sure we're not stepping on any global I/O operations
 511                 */
 512                di = &viocd_diskinfo[bevent->disk];
 513                spin_lock_irqsave(&viocd_reqlock, flags);
 514                dma_unmap_single(di->dev, bevent->token, bevent->len,
 515                                ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 516                                ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 517                req = (struct request *)bevent->event.xCorrelationToken;
 518                rwreq--;
 519
 520                if (event->xRc != HvLpEvent_Rc_Good) {
 521                        const struct vio_error_entry *err =
 522                                vio_lookup_rc(viocd_err_table,
 523                                                bevent->sub_result);
 524                        pr_warning("request %p failed with rc %d:0x%04X: %s\n",
 525                                   req, event->xRc,
 526                                   bevent->sub_result, err->msg);
 527                        __blk_end_request_all(req, -EIO);
 528                } else
 529                        __blk_end_request_all(req, 0);
 530
 531                /* restart handling of incoming requests */
 532                spin_unlock_irqrestore(&viocd_reqlock, flags);
 533                restart_all_queues(bevent->disk);
 534                break;
 535
 536        default:
 537                pr_warning("message with invalid subtype %0x04X!\n",
 538                           event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 539                if (hvlpevent_need_ack(event)) {
 540                        event->xRc = HvLpEvent_Rc_InvalidSubtype;
 541                        HvCallEvent_ackLpEvent(event);
 542                }
 543        }
 544}
 545
 546static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 547                             void *arg)
 548{
 549        return -EINVAL;
 550}
 551
 552static struct cdrom_device_ops viocd_dops = {
 553        .open = viocd_open,
 554        .release = viocd_release,
 555        .check_events = viocd_check_events,
 556        .lock_door = viocd_lock_door,
 557        .generic_packet = viocd_packet,
 558        .audio_ioctl = viocd_audio_ioctl,
 559        .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
 560};
 561
 562static int find_capability(const char *type)
 563{
 564        struct capability_entry *entry;
 565
 566        for(entry = capability_table; entry->type; ++entry)
 567                if(!strncmp(entry->type, type, 4))
 568                        break;
 569        return entry->capability;
 570}
 571
 572static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 573{
 574        struct gendisk *gendisk;
 575        int deviceno;
 576        struct disk_info *d;
 577        struct cdrom_device_info *c;
 578        struct request_queue *q;
 579        struct device_node *node = vdev->dev.of_node;
 580
 581        deviceno = vdev->unit_address;
 582        if (deviceno >= VIOCD_MAX_CD)
 583                return -ENODEV;
 584        if (!node)
 585                return -ENODEV;
 586
 587        if (deviceno >= viocd_numdev)
 588                viocd_numdev = deviceno + 1;
 589
 590        d = &viocd_diskinfo[deviceno];
 591        d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
 592        d->type = of_get_property(node, "linux,vio_type", NULL);
 593        d->model = of_get_property(node, "linux,vio_model", NULL);
 594
 595        c = &d->viocd_info;
 596
 597        c->ops = &viocd_dops;
 598        c->speed = 4;
 599        c->capacity = 1;
 600        c->handle = d;
 601        c->mask = ~find_capability(d->type);
 602        sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 603
 604        if (register_cdrom(c) != 0) {
 605                pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
 606                goto out;
 607        }
 608        pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
 609                c->name, d->rsrcname, d->type, d->model);
 610        q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 611        if (q == NULL) {
 612                pr_warning("Cannot allocate queue for %s!\n", c->name);
 613                goto out_unregister_cdrom;
 614        }
 615        gendisk = alloc_disk(1);
 616        if (gendisk == NULL) {
 617                pr_warning("Cannot create gendisk for %s!\n", c->name);
 618                goto out_cleanup_queue;
 619        }
 620        gendisk->major = VIOCD_MAJOR;
 621        gendisk->first_minor = deviceno;
 622        strncpy(gendisk->disk_name, c->name,
 623                        sizeof(gendisk->disk_name));
 624        blk_queue_max_segments(q, 1);
 625        blk_queue_max_hw_sectors(q, 4096 / 512);
 626        gendisk->queue = q;
 627        gendisk->fops = &viocd_fops;
 628        gendisk->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE |
 629                         GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
 630        set_capacity(gendisk, 0);
 631        gendisk->private_data = d;
 632        d->viocd_disk = gendisk;
 633        d->dev = &vdev->dev;
 634        gendisk->driverfs_dev = d->dev;
 635        add_disk(gendisk);
 636        return 0;
 637
 638out_cleanup_queue:
 639        blk_cleanup_queue(q);
 640out_unregister_cdrom:
 641        unregister_cdrom(c);
 642out:
 643        return -ENODEV;
 644}
 645
 646static int viocd_remove(struct vio_dev *vdev)
 647{
 648        struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 649
 650        unregister_cdrom(&d->viocd_info);
 651        del_gendisk(d->viocd_disk);
 652        blk_cleanup_queue(d->viocd_disk->queue);
 653        put_disk(d->viocd_disk);
 654        return 0;
 655}
 656
 657/**
 658 * viocd_device_table: Used by vio.c to match devices that we
 659 * support.
 660 */
 661static struct vio_device_id viocd_device_table[] __devinitdata = {
 662        { "block", "IBM,iSeries-viocd" },
 663        { "", "" }
 664};
 665MODULE_DEVICE_TABLE(vio, viocd_device_table);
 666
 667static struct vio_driver viocd_driver = {
 668        .id_table = viocd_device_table,
 669        .probe = viocd_probe,
 670        .remove = viocd_remove,
 671        .driver = {
 672                .name = "viocd",
 673                .owner = THIS_MODULE,
 674        }
 675};
 676
 677static int __init viocd_init(void)
 678{
 679        int ret = 0;
 680
 681        if (!firmware_has_feature(FW_FEATURE_ISERIES))
 682                return -ENODEV;
 683
 684        if (viopath_hostLp == HvLpIndexInvalid) {
 685                vio_set_hostlp();
 686                /* If we don't have a host, bail out */
 687                if (viopath_hostLp == HvLpIndexInvalid)
 688                        return -ENODEV;
 689        }
 690
 691        pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
 692
 693        if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 694                pr_warning("Unable to get major %d for %s\n",
 695                           VIOCD_MAJOR, VIOCD_DEVICE);
 696                return -EIO;
 697        }
 698
 699        ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 700                        MAX_CD_REQ + 2);
 701        if (ret) {
 702                pr_warning("error opening path to host partition %d\n",
 703                           viopath_hostLp);
 704                goto out_unregister;
 705        }
 706
 707        /* Initialize our request handler */
 708        vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 709
 710        spin_lock_init(&viocd_reqlock);
 711
 712        ret = vio_register_driver(&viocd_driver);
 713        if (ret)
 714                goto out_free_info;
 715
 716        proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
 717                    &proc_viocd_operations);
 718        return 0;
 719
 720out_free_info:
 721        vio_clearHandler(viomajorsubtype_cdio);
 722        viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 723out_unregister:
 724        unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 725        return ret;
 726}
 727
 728static void __exit viocd_exit(void)
 729{
 730        remove_proc_entry("iSeries/viocd", NULL);
 731        vio_unregister_driver(&viocd_driver);
 732        viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 733        vio_clearHandler(viomajorsubtype_cdio);
 734        unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 735}
 736
 737module_init(viocd_init);
 738module_exit(viocd_exit);
 739MODULE_LICENSE("GPL");
 740