| /* |
| * Linux driver for System z and s390 unit record devices |
| * (z/VM virtual punch, reader, printer) |
| * |
| * Copyright IBM Corp. 2001, 2007 |
| * Authors: Malcolm Beattie <beattiem@uk.ibm.com> |
| * Michael Holzheu <holzheu@de.ibm.com> |
| * Frank Munzert <munzert@de.ibm.com> |
| */ |
| |
| #include <linux/cdev.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/cio.h> |
| #include <asm/ccwdev.h> |
| #include <asm/debug.h> |
| |
| #include "vmur.h" |
| |
| /* |
| * Driver overview |
| * |
| * Unit record device support is implemented as a character device driver. |
| * We can fit at least 16 bits into a device minor number and use the |
| * simple method of mapping a character device number with minor abcd |
| * to the unit record device with devno abcd. |
| * I/O to virtual unit record devices is handled as follows: |
| * Reads: Diagnose code 0x14 (input spool file manipulation) |
| * is used to read spool data page-wise. |
| * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length |
| * is available by reading sysfs attr reclen. Each write() to the device |
| * must specify an integral multiple (maximal 511) of reclen. |
| */ |
| |
| static char ur_banner[] = "z/VM virtual unit record device driver"; |
| |
| MODULE_AUTHOR("IBM Corporation"); |
| MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver"); |
| MODULE_LICENSE("GPL"); |
| |
| #define PRINTK_HEADER "vmur: " |
| |
| static dev_t ur_first_dev_maj_min; |
| static struct class *vmur_class; |
| static struct debug_info *vmur_dbf; |
| |
| /* We put the device's record length (for writes) in the driver_info field */ |
| static struct ccw_device_id ur_ids[] = { |
| { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) }, |
| { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) }, |
| { /* end of list */ } |
| }; |
| |
| MODULE_DEVICE_TABLE(ccw, ur_ids); |
| |
| static int ur_probe(struct ccw_device *cdev); |
| static void ur_remove(struct ccw_device *cdev); |
| static int ur_set_online(struct ccw_device *cdev); |
| static int ur_set_offline(struct ccw_device *cdev); |
| |
| static struct ccw_driver ur_driver = { |
| .name = "vmur", |
| .owner = THIS_MODULE, |
| .ids = ur_ids, |
| .probe = ur_probe, |
| .remove = ur_remove, |
| .set_online = ur_set_online, |
| .set_offline = ur_set_offline, |
| }; |
| |
| /* |
| * Allocation, freeing, getting and putting of urdev structures |
| */ |
| static struct urdev *urdev_alloc(struct ccw_device *cdev) |
| { |
| struct urdev *urd; |
| |
| urd = kzalloc(sizeof(struct urdev), GFP_KERNEL); |
| if (!urd) |
| return NULL; |
| urd->cdev = cdev; |
| urd->reclen = cdev->id.driver_info; |
| ccw_device_get_id(cdev, &urd->dev_id); |
| mutex_init(&urd->io_mutex); |
| mutex_init(&urd->open_mutex); |
| return urd; |
| } |
| |
| static void urdev_free(struct urdev *urd) |
| { |
| kfree(urd); |
| } |
| |
| /* |
| * This is how the character device driver gets a reference to a |
| * ur device. When this call returns successfully, a reference has |
| * been taken (by get_device) on the underlying kobject. The recipient |
| * of this urdev pointer must eventually drop it with urdev_put(urd) |
| * which does the corresponding put_device(). |
| */ |
| static struct urdev *urdev_get_from_devno(u16 devno) |
| { |
| char bus_id[16]; |
| struct ccw_device *cdev; |
| |
| sprintf(bus_id, "0.0.%04x", devno); |
| cdev = get_ccwdev_by_busid(&ur_driver, bus_id); |
| if (!cdev) |
| return NULL; |
| |
| return cdev->dev.driver_data; |
| } |
| |
| static void urdev_put(struct urdev *urd) |
| { |
| put_device(&urd->cdev->dev); |
| } |
| |
| /* |
| * Low-level functions to do I/O to a ur device. |
| * alloc_chan_prog |
| * free_chan_prog |
| * do_ur_io |
| * ur_int_handler |
| * |
| * alloc_chan_prog allocates and builds the channel program |
| * free_chan_prog frees memory of the channel program |
| * |
| * do_ur_io issues the channel program to the device and blocks waiting |
| * on a completion event it publishes at urd->io_done. The function |
| * serialises itself on the device's mutex so that only one I/O |
| * is issued at a time (and that I/O is synchronous). |
| * |
| * ur_int_handler catches the "I/O done" interrupt, writes the |
| * subchannel status word into the scsw member of the urdev structure |
| * and complete()s the io_done to wake the waiting do_ur_io. |
| * |
| * The caller of do_ur_io is responsible for kfree()ing the channel program |
| * address pointer that alloc_chan_prog returned. |
| */ |
| |
| static void free_chan_prog(struct ccw1 *cpa) |
| { |
| struct ccw1 *ptr = cpa; |
| |
| while (ptr->cda) { |
| kfree((void *)(addr_t) ptr->cda); |
| ptr++; |
| } |
| kfree(cpa); |
| } |
| |
| /* |
| * alloc_chan_prog |
| * The channel program we use is write commands chained together |
| * with a final NOP CCW command-chained on (which ensures that CE and DE |
| * are presented together in a single interrupt instead of as separate |
| * interrupts unless an incorrect length indication kicks in first). The |
| * data length in each CCW is reclen. |
| */ |
| static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count, |
| int reclen) |
| { |
| struct ccw1 *cpa; |
| void *kbuf; |
| int i; |
| |
| TRACE("alloc_chan_prog(%p, %i, %i)\n", ubuf, rec_count, reclen); |
| |
| /* |
| * We chain a NOP onto the writes to force CE+DE together. |
| * That means we allocate room for CCWs to cover count/reclen |
| * records plus a NOP. |
| */ |
| cpa = kzalloc((rec_count + 1) * sizeof(struct ccw1), |
| GFP_KERNEL | GFP_DMA); |
| if (!cpa) |
| return ERR_PTR(-ENOMEM); |
| |
| for (i = 0; i < rec_count; i++) { |
| cpa[i].cmd_code = WRITE_CCW_CMD; |
| cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI; |
| cpa[i].count = reclen; |
| kbuf = kmalloc(reclen, GFP_KERNEL | GFP_DMA); |
| if (!kbuf) { |
| free_chan_prog(cpa); |
| return ERR_PTR(-ENOMEM); |
| } |
| cpa[i].cda = (u32)(addr_t) kbuf; |
| if (copy_from_user(kbuf, ubuf, reclen)) { |
| free_chan_prog(cpa); |
| return ERR_PTR(-EFAULT); |
| } |
| ubuf += reclen; |
| } |
| /* The following NOP CCW forces CE+DE to be presented together */ |
| cpa[i].cmd_code = CCW_CMD_NOOP; |
| return cpa; |
| } |
| |
| static int do_ur_io(struct urdev *urd, struct ccw1 *cpa) |
| { |
| int rc; |
| struct ccw_device *cdev = urd->cdev; |
| DECLARE_COMPLETION_ONSTACK(event); |
| |
| TRACE("do_ur_io: cpa=%p\n", cpa); |
| |
| rc = mutex_lock_interruptible(&urd->io_mutex); |
| if (rc) |
| return rc; |
| |
| urd->io_done = &event; |
| |
| spin_lock_irq(get_ccwdev_lock(cdev)); |
| rc = ccw_device_start(cdev, cpa, 1, 0, 0); |
| spin_unlock_irq(get_ccwdev_lock(cdev)); |
| |
| TRACE("do_ur_io: ccw_device_start returned %d\n", rc); |
| if (rc) |
| goto out; |
| |
| wait_for_completion(&event); |
| TRACE("do_ur_io: I/O complete\n"); |
| rc = 0; |
| |
| out: |
| mutex_unlock(&urd->io_mutex); |
| return rc; |
| } |
| |
| /* |
| * ur interrupt handler, called from the ccw_device layer |
| */ |
| static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm, |
| struct irb *irb) |
| { |
| struct urdev *urd; |
| |
| TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n", |
| intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count); |
| |
| if (!intparm) { |
| TRACE("ur_int_handler: unsolicited interrupt\n"); |
| return; |
| } |
| urd = cdev->dev.driver_data; |
| /* On special conditions irb is an error pointer */ |
| if (IS_ERR(irb)) |
| urd->io_request_rc = PTR_ERR(irb); |
| else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END)) |
| urd->io_request_rc = 0; |
| else |
| urd->io_request_rc = -EIO; |
| |
| complete(urd->io_done); |
| } |
| |
| /* |
| * reclen sysfs attribute - The record length to be used for write CCWs |
| */ |
| static ssize_t ur_attr_reclen_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct urdev *urd = dev->driver_data; |
| |
| return sprintf(buf, "%zu\n", urd->reclen); |
| } |
| |
| static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL); |
| |
| static int ur_create_attributes(struct device *dev) |
| { |
| return device_create_file(dev, &dev_attr_reclen); |
| } |
| |
| static void ur_remove_attributes(struct device *dev) |
| { |
| device_remove_file(dev, &dev_attr_reclen); |
| } |
| |
| /* |
| * diagnose code 0x210 - retrieve device information |
| * cc=0 normal completion, we have a real device |
| * cc=1 CP paging error |
| * cc=2 The virtual device exists, but is not associated with a real device |
| * cc=3 Invalid device address, or the virtual device does not exist |
| */ |
| static int get_urd_class(struct urdev *urd) |
| { |
| static struct diag210 ur_diag210; |
| int cc; |
| |
| ur_diag210.vrdcdvno = urd->dev_id.devno; |
| ur_diag210.vrdclen = sizeof(struct diag210); |
| |
| cc = diag210(&ur_diag210); |
| switch (cc) { |
| case 0: |
| return -ENOTSUPP; |
| case 2: |
| return ur_diag210.vrdcvcla; /* virtual device class */ |
| case 3: |
| return -ENODEV; |
| default: |
| return -EIO; |
| } |
| } |
| |
| /* |
| * Allocation and freeing of urfile structures |
| */ |
| static struct urfile *urfile_alloc(struct urdev *urd) |
| { |
| struct urfile *urf; |
| |
| urf = kzalloc(sizeof(struct urfile), GFP_KERNEL); |
| if (!urf) |
| return NULL; |
| urf->urd = urd; |
| |
| TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf, |
| urf->dev_reclen); |
| |
| return urf; |
| } |
| |
| static void urfile_free(struct urfile *urf) |
| { |
| TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd); |
| kfree(urf); |
| } |
| |
| /* |
| * The fops implementation of the character device driver |
| */ |
| static ssize_t do_write(struct urdev *urd, const char __user *udata, |
| size_t count, size_t reclen, loff_t *ppos) |
| { |
| struct ccw1 *cpa; |
| int rc; |
| |
| cpa = alloc_chan_prog(udata, count / reclen, reclen); |
| if (IS_ERR(cpa)) |
| return PTR_ERR(cpa); |
| |
| rc = do_ur_io(urd, cpa); |
| if (rc) |
| goto fail_kfree_cpa; |
| |
| if (urd->io_request_rc) { |
| rc = urd->io_request_rc; |
| goto fail_kfree_cpa; |
| } |
| *ppos += count; |
| rc = count; |
| |
| fail_kfree_cpa: |
| free_chan_prog(cpa); |
| return rc; |
| } |
| |
| static ssize_t ur_write(struct file *file, const char __user *udata, |
| size_t count, loff_t *ppos) |
| { |
| struct urfile *urf = file->private_data; |
| |
| TRACE("ur_write: count=%zu\n", count); |
| |
| if (count == 0) |
| return 0; |
| |
| if (count % urf->dev_reclen) |
| return -EINVAL; /* count must be a multiple of reclen */ |
| |
| if (count > urf->dev_reclen * MAX_RECS_PER_IO) |
| count = urf->dev_reclen * MAX_RECS_PER_IO; |
| |
| return do_write(urf->urd, udata, count, urf->dev_reclen, ppos); |
| } |
| |
| static int do_diag_14(unsigned long rx, unsigned long ry1, |
| unsigned long subcode) |
| { |
| register unsigned long _ry1 asm("2") = ry1; |
| register unsigned long _ry2 asm("3") = subcode; |
| int rc = 0; |
| |
| asm volatile( |
| #ifdef CONFIG_64BIT |
| " sam31\n" |
| " diag %2,2,0x14\n" |
| " sam64\n" |
| #else |
| " diag %2,2,0x14\n" |
| #endif |
| " ipm %0\n" |
| " srl %0,28\n" |
| : "=d" (rc), "+d" (_ry2) |
| : "d" (rx), "d" (_ry1) |
| : "cc"); |
| |
| TRACE("diag 14: subcode=0x%lx, cc=%i\n", subcode, rc); |
| return rc; |
| } |
| |
| /* |
| * diagnose code 0x14 subcode 0x0028 - position spool file to designated |
| * record |
| * cc=0 normal completion |
| * cc=2 no file active on the virtual reader or device not ready |
| * cc=3 record specified is beyond EOF |
| */ |
| static int diag_position_to_record(int devno, int record) |
| { |
| int cc; |
| |
| cc = do_diag_14(record, devno, 0x28); |
| switch (cc) { |
| case 0: |
| return 0; |
| case 2: |
| return -ENOMEDIUM; |
| case 3: |
| return -ENODATA; /* position beyond end of file */ |
| default: |
| return -EIO; |
| } |
| } |
| |
| /* |
| * diagnose code 0x14 subcode 0x0000 - read next spool file buffer |
| * cc=0 normal completion |
| * cc=1 EOF reached |
| * cc=2 no file active on the virtual reader, and no file eligible |
| * cc=3 file already active on the virtual reader or specified virtual |
| * reader does not exist or is not a reader |
| */ |
| static int diag_read_file(int devno, char *buf) |
| { |
| int cc; |
| |
| cc = do_diag_14((unsigned long) buf, devno, 0x00); |
| switch (cc) { |
| case 0: |
| return 0; |
| case 1: |
| return -ENODATA; |
| case 2: |
| return -ENOMEDIUM; |
| default: |
| return -EIO; |
| } |
| } |
| |
| static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count, |
| loff_t *offs) |
| { |
| size_t len, copied, res; |
| char *buf; |
| int rc; |
| u16 reclen; |
| struct urdev *urd; |
| |
| urd = ((struct urfile *) file->private_data)->urd; |
| reclen = ((struct urfile *) file->private_data)->file_reclen; |
| |
| rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1); |
| if (rc == -ENODATA) |
| return 0; |
| if (rc) |
| return rc; |
| |
| len = min((size_t) PAGE_SIZE, count); |
| buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| copied = 0; |
| res = (size_t) (*offs % PAGE_SIZE); |
| do { |
| rc = diag_read_file(urd->dev_id.devno, buf); |
| if (rc == -ENODATA) { |
| break; |
| } |
| if (rc) |
| goto fail; |
| if (reclen && (copied == 0) && (*offs < PAGE_SIZE)) |
| *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen; |
| len = min(count - copied, PAGE_SIZE - res); |
| if (copy_to_user(ubuf + copied, buf + res, len)) { |
| rc = -EFAULT; |
| goto fail; |
| } |
| res = 0; |
| copied += len; |
| } while (copied != count); |
| |
| *offs += copied; |
| rc = copied; |
| fail: |
| kfree(buf); |
| return rc; |
| } |
| |
| static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count, |
| loff_t *offs) |
| { |
| struct urdev *urd; |
| int rc; |
| |
| TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs); |
| |
| if (count == 0) |
| return 0; |
| |
| urd = ((struct urfile *) file->private_data)->urd; |
| rc = mutex_lock_interruptible(&urd->io_mutex); |
| if (rc) |
| return rc; |
| rc = diag14_read(file, ubuf, count, offs); |
| mutex_unlock(&urd->io_mutex); |
| return rc; |
| } |
| |
| /* |
| * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor |
| * cc=0 normal completion |
| * cc=1 no files on reader queue or no subsequent file |
| * cc=2 spid specified is invalid |
| */ |
| static int diag_read_next_file_info(struct file_control_block *buf, int spid) |
| { |
| int cc; |
| |
| cc = do_diag_14((unsigned long) buf, spid, 0xfff); |
| switch (cc) { |
| case 0: |
| return 0; |
| default: |
| return -ENODATA; |
| } |
| } |
| |
| static int verify_device(struct urdev *urd) |
| { |
| struct file_control_block fcb; |
| char *buf; |
| int rc; |
| |
| switch (urd->class) { |
| case DEV_CLASS_UR_O: |
| return 0; /* no check needed here */ |
| case DEV_CLASS_UR_I: |
| /* check for empty reader device (beginning of chain) */ |
| rc = diag_read_next_file_info(&fcb, 0); |
| if (rc) |
| return rc; |
| /* if file is in hold status, we do not read it */ |
| if (fcb.file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) |
| return -EPERM; |
| /* open file on virtual reader */ |
| buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| rc = diag_read_file(urd->dev_id.devno, buf); |
| kfree(buf); |
| if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */ |
| return rc; |
| /* check if the file on top of the queue is open now */ |
| rc = diag_read_next_file_info(&fcb, 0); |
| if (rc) |
| return rc; |
| if (!(fcb.file_stat & FLG_IN_USE)) |
| return -EMFILE; |
| return 0; |
| default: |
| return -ENOTSUPP; |
| } |
| } |
| |
| static int get_file_reclen(struct urdev *urd) |
| { |
| struct file_control_block fcb; |
| int rc; |
| |
| switch (urd->class) { |
| case DEV_CLASS_UR_O: |
| return 0; |
| case DEV_CLASS_UR_I: |
| rc = diag_read_next_file_info(&fcb, 0); |
| if (rc) |
| return rc; |
| break; |
| default: |
| return -ENOTSUPP; |
| } |
| if (fcb.file_stat & FLG_CP_DUMP) |
| return 0; |
| |
| return fcb.rec_len; |
| } |
| |
| static int ur_open(struct inode *inode, struct file *file) |
| { |
| u16 devno; |
| struct urdev *urd; |
| struct urfile *urf; |
| unsigned short accmode; |
| int rc; |
| |
| accmode = file->f_flags & O_ACCMODE; |
| |
| if (accmode == O_RDWR) |
| return -EACCES; |
| |
| /* |
| * We treat the minor number as the devno of the ur device |
| * to find in the driver tree. |
| */ |
| devno = MINOR(file->f_dentry->d_inode->i_rdev); |
| |
| urd = urdev_get_from_devno(devno); |
| if (!urd) |
| return -ENXIO; |
| |
| if (file->f_flags & O_NONBLOCK) { |
| if (!mutex_trylock(&urd->open_mutex)) { |
| rc = -EBUSY; |
| goto fail_put; |
| } |
| } else { |
| if (mutex_lock_interruptible(&urd->open_mutex)) { |
| rc = -ERESTARTSYS; |
| goto fail_put; |
| } |
| } |
| |
| TRACE("ur_open\n"); |
| |
| if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) || |
| ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) { |
| TRACE("ur_open: unsupported dev class (%d)\n", urd->class); |
| rc = -EACCES; |
| goto fail_unlock; |
| } |
| |
| rc = verify_device(urd); |
| if (rc) |
| goto fail_unlock; |
| |
| urf = urfile_alloc(urd); |
| if (!urf) { |
| rc = -ENOMEM; |
| goto fail_unlock; |
| } |
| |
| urf->dev_reclen = urd->reclen; |
| rc = get_file_reclen(urd); |
| if (rc < 0) |
| goto fail_urfile_free; |
| urf->file_reclen = rc; |
| file->private_data = urf; |
| return 0; |
| |
| fail_urfile_free: |
| urfile_free(urf); |
| fail_unlock: |
| mutex_unlock(&urd->open_mutex); |
| fail_put: |
| urdev_put(urd); |
| return rc; |
| } |
| |
| static int ur_release(struct inode *inode, struct file *file) |
| { |
| struct urfile *urf = file->private_data; |
| |
| TRACE("ur_release\n"); |
| mutex_unlock(&urf->urd->open_mutex); |
| urdev_put(urf->urd); |
| urfile_free(urf); |
| return 0; |
| } |
| |
| static loff_t ur_llseek(struct file *file, loff_t offset, int whence) |
| { |
| loff_t newpos; |
| |
| if ((file->f_flags & O_ACCMODE) != O_RDONLY) |
| return -ESPIPE; /* seek allowed only for reader */ |
| if (offset % PAGE_SIZE) |
| return -ESPIPE; /* only multiples of 4K allowed */ |
| switch (whence) { |
| case 0: /* SEEK_SET */ |
| newpos = offset; |
| break; |
| case 1: /* SEEK_CUR */ |
| newpos = file->f_pos + offset; |
| break; |
| default: |
| return -EINVAL; |
| } |
| file->f_pos = newpos; |
| return newpos; |
| } |
| |
| static struct file_operations ur_fops = { |
| .owner = THIS_MODULE, |
| .open = ur_open, |
| .release = ur_release, |
| .read = ur_read, |
| .write = ur_write, |
| .llseek = ur_llseek, |
| }; |
| |
| /* |
| * ccw_device infrastructure: |
| * ur_probe gets its own ref to the device (i.e. get_device), |
| * creates the struct urdev, the device attributes, sets up |
| * the interrupt handler and validates the virtual unit record device. |
| * ur_remove removes the device attributes, frees the struct urdev |
| * and drops (put_device) the ref to the device we got in ur_probe. |
| */ |
| static int ur_probe(struct ccw_device *cdev) |
| { |
| struct urdev *urd; |
| int rc; |
| |
| TRACE("ur_probe: cdev=%p state=%d\n", cdev, *(int *) cdev->private); |
| |
| if (!get_device(&cdev->dev)) |
| return -ENODEV; |
| |
| urd = urdev_alloc(cdev); |
| if (!urd) { |
| rc = -ENOMEM; |
| goto fail; |
| } |
| rc = ur_create_attributes(&cdev->dev); |
| if (rc) { |
| rc = -ENOMEM; |
| goto fail; |
| } |
| cdev->dev.driver_data = urd; |
| cdev->handler = ur_int_handler; |
| |
| /* validate virtual unit record device */ |
| urd->class = get_urd_class(urd); |
| if (urd->class < 0) { |
| rc = urd->class; |
| goto fail; |
| } |
| if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) { |
| rc = -ENOTSUPP; |
| goto fail; |
| } |
| |
| return 0; |
| |
| fail: |
| urdev_free(urd); |
| put_device(&cdev->dev); |
| return rc; |
| } |
| |
| static void ur_remove(struct ccw_device *cdev) |
| { |
| struct urdev *urd = cdev->dev.driver_data; |
| |
| TRACE("ur_remove\n"); |
| if (cdev->online) |
| ur_set_offline(cdev); |
| ur_remove_attributes(&cdev->dev); |
| urdev_free(urd); |
| put_device(&cdev->dev); |
| } |
| |
| static int ur_set_online(struct ccw_device *cdev) |
| { |
| struct urdev *urd; |
| int minor, major, rc; |
| char node_id[16]; |
| |
| TRACE("ur_set_online: cdev=%p state=%d\n", cdev, |
| *(int *) cdev->private); |
| |
| if (!try_module_get(ur_driver.owner)) |
| return -EINVAL; |
| |
| urd = (struct urdev *) cdev->dev.driver_data; |
| minor = urd->dev_id.devno; |
| major = MAJOR(ur_first_dev_maj_min); |
| |
| urd->char_device = cdev_alloc(); |
| if (!urd->char_device) { |
| rc = -ENOMEM; |
| goto fail_module_put; |
| } |
| |
| cdev_init(urd->char_device, &ur_fops); |
| urd->char_device->dev = MKDEV(major, minor); |
| urd->char_device->owner = ur_fops.owner; |
| |
| rc = cdev_add(urd->char_device, urd->char_device->dev, 1); |
| if (rc) |
| goto fail_free_cdev; |
| if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) { |
| if (urd->class == DEV_CLASS_UR_I) |
| sprintf(node_id, "vmrdr-%s", cdev->dev.bus_id); |
| if (urd->class == DEV_CLASS_UR_O) |
| sprintf(node_id, "vmpun-%s", cdev->dev.bus_id); |
| } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) { |
| sprintf(node_id, "vmprt-%s", cdev->dev.bus_id); |
| } else { |
| rc = -ENOTSUPP; |
| goto fail_free_cdev; |
| } |
| |
| urd->device = device_create(vmur_class, NULL, urd->char_device->dev, |
| "%s", node_id); |
| if (IS_ERR(urd->device)) { |
| rc = PTR_ERR(urd->device); |
| TRACE("ur_set_online: device_create rc=%d\n", rc); |
| goto fail_free_cdev; |
| } |
| |
| return 0; |
| |
| fail_free_cdev: |
| cdev_del(urd->char_device); |
| fail_module_put: |
| module_put(ur_driver.owner); |
| |
| return rc; |
| } |
| |
| static int ur_set_offline(struct ccw_device *cdev) |
| { |
| struct urdev *urd; |
| |
| TRACE("ur_set_offline: cdev=%p cdev->private=%p state=%d\n", |
| cdev, cdev->private, *(int *) cdev->private); |
| urd = (struct urdev *) cdev->dev.driver_data; |
| device_destroy(vmur_class, urd->char_device->dev); |
| cdev_del(urd->char_device); |
| module_put(ur_driver.owner); |
| |
| return 0; |
| } |
| |
| /* |
| * Module initialisation and cleanup |
| */ |
| static int __init ur_init(void) |
| { |
| int rc; |
| dev_t dev; |
| |
| if (!MACHINE_IS_VM) { |
| PRINT_ERR("%s is only available under z/VM.\n", ur_banner); |
| return -ENODEV; |
| } |
| |
| vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long)); |
| if (!vmur_dbf) |
| return -ENOMEM; |
| rc = debug_register_view(vmur_dbf, &debug_sprintf_view); |
| if (rc) |
| goto fail_free_dbf; |
| |
| debug_set_level(vmur_dbf, 6); |
| |
| rc = ccw_driver_register(&ur_driver); |
| if (rc) |
| goto fail_free_dbf; |
| |
| rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur"); |
| if (rc) { |
| PRINT_ERR("alloc_chrdev_region failed: err = %d\n", rc); |
| goto fail_unregister_driver; |
| } |
| ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0); |
| |
| vmur_class = class_create(THIS_MODULE, "vmur"); |
| if (IS_ERR(vmur_class)) { |
| rc = PTR_ERR(vmur_class); |
| goto fail_unregister_region; |
| } |
| PRINT_INFO("%s loaded.\n", ur_banner); |
| return 0; |
| |
| fail_unregister_region: |
| unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); |
| fail_unregister_driver: |
| ccw_driver_unregister(&ur_driver); |
| fail_free_dbf: |
| debug_unregister(vmur_dbf); |
| return rc; |
| } |
| |
| static void __exit ur_exit(void) |
| { |
| class_destroy(vmur_class); |
| unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); |
| ccw_driver_unregister(&ur_driver); |
| debug_unregister(vmur_dbf); |
| PRINT_INFO("%s unloaded.\n", ur_banner); |
| } |
| |
| module_init(ur_init); |
| module_exit(ur_exit); |