2 * Driver for HP iLO/iLO2 management processor.
4 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
5 * David Altobelli <david.altobelli@hp.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/interrupt.h>
17 #include <linux/ioport.h>
18 #include <linux/device.h>
19 #include <linux/file.h>
20 #include <linux/cdev.h>
21 #include <linux/spinlock.h>
22 #include <linux/delay.h>
23 #include <linux/uaccess.h>
25 #include <linux/wait.h>
28 static struct class *ilo_class;
29 static unsigned int ilo_major;
30 static char ilo_hwdev[MAX_ILO_DEV];
32 static inline int get_entry_id(int entry)
34 return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
37 static inline int get_entry_len(int entry)
39 return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
42 static inline int mk_entry(int id, int len)
44 int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
45 return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
48 static inline int desc_mem_sz(int nr_entry)
50 return nr_entry << L2_QENTRY_SZ;
54 * FIFO queues, shared with hardware.
56 * If a queue has empty slots, an entry is added to the queue tail,
57 * and that entry is marked as occupied.
58 * Entries can be dequeued from the head of the list, when the device
59 * has marked the entry as consumed.
61 * Returns true on successful queue/dequeue, false on failure.
63 static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
65 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
69 spin_lock_irqsave(&hw->fifo_lock, flags);
70 if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
72 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
73 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
77 spin_unlock_irqrestore(&hw->fifo_lock, flags);
82 static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
84 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
89 spin_lock_irqsave(&hw->fifo_lock, flags);
90 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
91 if (c & ENTRY_MASK_C) {
93 *entry = c & ENTRY_MASK_NOSTATE;
95 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
100 spin_unlock_irqrestore(&hw->fifo_lock, flags);
105 static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
106 int dir, int id, int len)
112 fifobar = ccb->ccb_u1.send_fifobar;
114 fifobar = ccb->ccb_u3.recv_fifobar;
116 entry = mk_entry(id, len);
117 return fifo_enqueue(hw, fifobar, entry);
120 static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
121 int dir, int *id, int *len, void **pkt)
123 char *fifobar, *desc;
124 int entry = 0, pkt_id = 0;
128 fifobar = ccb->ccb_u1.send_fifobar;
129 desc = ccb->ccb_u2.send_desc;
131 fifobar = ccb->ccb_u3.recv_fifobar;
132 desc = ccb->ccb_u4.recv_desc;
135 ret = fifo_dequeue(hw, fifobar, &entry);
137 pkt_id = get_entry_id(entry);
141 *len = get_entry_len(entry);
143 *pkt = (void *)(desc + desc_mem_sz(pkt_id));
149 static inline void doorbell_set(struct ccb *ccb)
151 iowrite8(1, ccb->ccb_u5.db_base);
154 static inline void doorbell_clr(struct ccb *ccb)
156 iowrite8(2, ccb->ccb_u5.db_base);
159 static inline int ctrl_set(int l2sz, int idxmask, int desclim)
161 int active = 0, go = 1;
162 return l2sz << CTRL_BITPOS_L2SZ |
163 idxmask << CTRL_BITPOS_FIFOINDEXMASK |
164 desclim << CTRL_BITPOS_DESCLIMIT |
165 active << CTRL_BITPOS_A |
169 static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
171 /* for simplicity, use the same parameters for send and recv ctrls */
172 ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
173 ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
176 static inline int fifo_sz(int nr_entry)
178 /* size of a fifo is determined by the number of entries it contains */
179 return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
182 static void fifo_setup(void *base_addr, int nr_entry)
184 struct fifo *fifo_q = base_addr;
187 /* set up an empty fifo */
191 fifo_q->nrents = nr_entry;
192 fifo_q->imask = nr_entry - 1;
193 fifo_q->merge = ENTRY_MASK_O;
195 for (i = 0; i < nr_entry; i++)
196 fifo_q->fifobar[i] = 0;
199 static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
201 struct ccb *driver_ccb = &data->driver_ccb;
202 struct ccb __iomem *device_ccb = data->mapped_ccb;
205 /* complicated dance to tell the hw we are stopping */
206 doorbell_clr(driver_ccb);
207 iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
208 &device_ccb->send_ctrl);
209 iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
210 &device_ccb->recv_ctrl);
212 /* give iLO some time to process stop request */
213 for (retries = MAX_WAIT; retries > 0; retries--) {
214 doorbell_set(driver_ccb);
216 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
218 !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
222 dev_err(&pdev->dev, "Closing, but controller still active\n");
224 /* clear the hw ccb */
225 memset_io(device_ccb, 0, sizeof(struct ccb));
227 /* free resources used to back send/recv queues */
228 pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
231 static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
233 char *dma_va, *dma_pa;
234 struct ccb *driver_ccb, *ilo_ccb;
236 driver_ccb = &data->driver_ccb;
237 ilo_ccb = &data->ilo_ccb;
239 data->dma_size = 2 * fifo_sz(NR_QENTRY) +
240 2 * desc_mem_sz(NR_QENTRY) +
241 ILO_START_ALIGN + ILO_CACHE_SZ;
243 data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
248 dma_va = (char *)data->dma_va;
249 dma_pa = (char *)data->dma_pa;
251 memset(dma_va, 0, data->dma_size);
253 dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
254 dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN);
257 * Create two ccb's, one with virt addrs, one with phys addrs.
258 * Copy the phys addr ccb to device shared mem.
260 ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
261 ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
263 fifo_setup(dma_va, NR_QENTRY);
264 driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
265 ilo_ccb->ccb_u1.send_fifobar = dma_pa + FIFOHANDLESIZE;
266 dma_va += fifo_sz(NR_QENTRY);
267 dma_pa += fifo_sz(NR_QENTRY);
269 dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
270 dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ);
272 fifo_setup(dma_va, NR_QENTRY);
273 driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
274 ilo_ccb->ccb_u3.recv_fifobar = dma_pa + FIFOHANDLESIZE;
275 dma_va += fifo_sz(NR_QENTRY);
276 dma_pa += fifo_sz(NR_QENTRY);
278 driver_ccb->ccb_u2.send_desc = dma_va;
279 ilo_ccb->ccb_u2.send_desc = dma_pa;
280 dma_pa += desc_mem_sz(NR_QENTRY);
281 dma_va += desc_mem_sz(NR_QENTRY);
283 driver_ccb->ccb_u4.recv_desc = dma_va;
284 ilo_ccb->ccb_u4.recv_desc = dma_pa;
286 driver_ccb->channel = slot;
287 ilo_ccb->channel = slot;
289 driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
290 ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
295 static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
298 struct ccb *driver_ccb = &data->driver_ccb;
300 /* copy the ccb with physical addrs to device memory */
301 data->mapped_ccb = (struct ccb __iomem *)
302 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
303 memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
305 /* put packets on the send and receive queues */
307 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
308 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
309 doorbell_set(driver_ccb);
312 pkt_sz = desc_mem_sz(1);
313 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
314 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
316 /* the ccb is ready to use */
317 doorbell_clr(driver_ccb);
320 static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
323 struct ccb *driver_ccb = &data->driver_ccb;
325 /* make sure iLO is really handling requests */
326 for (i = MAX_WAIT; i > 0; i--) {
327 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
333 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
337 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
338 doorbell_set(driver_ccb);
342 static inline int is_channel_reset(struct ccb *ccb)
344 /* check for this particular channel needing a reset */
345 return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
348 static inline void set_channel_reset(struct ccb *ccb)
350 /* set a flag indicating this channel needs a reset */
351 FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
354 static inline int get_device_outbound(struct ilo_hwinfo *hw)
356 return ioread32(&hw->mmio_vaddr[DB_OUT]);
359 static inline int is_db_reset(int db_out)
361 return db_out & (1 << DB_RESET);
364 static inline int is_device_reset(struct ilo_hwinfo *hw)
366 /* check for global reset condition */
367 return is_db_reset(get_device_outbound(hw));
370 static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
372 iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
375 static inline void clear_device(struct ilo_hwinfo *hw)
377 /* clear the device (reset bits, pending channel entries) */
378 clear_pending_db(hw, -1);
381 static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
383 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
386 static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
388 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
389 &hw->mmio_vaddr[DB_IRQ]);
392 static void ilo_set_reset(struct ilo_hwinfo *hw)
397 * Mapped memory is zeroed on ilo reset, so set a per ccb flag
398 * to indicate that this ccb needs to be closed and reopened.
400 for (slot = 0; slot < MAX_CCB; slot++) {
401 if (!hw->ccb_alloc[slot])
403 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
407 static ssize_t ilo_read(struct file *fp, char __user *buf,
408 size_t len, loff_t *off)
410 int err, found, cnt, pkt_id, pkt_len;
411 struct ccb_data *data = fp->private_data;
412 struct ccb *driver_ccb = &data->driver_ccb;
413 struct ilo_hwinfo *hw = data->ilo_hw;
416 if (is_channel_reset(driver_ccb)) {
418 * If the device has been reset, applications
419 * need to close and reopen all ccbs.
425 * This function is to be called when data is expected
426 * in the channel, and will return an error if no packet is found
427 * during the loop below. The sleep/retry logic is to allow
428 * applications to call read() immediately post write(),
429 * and give iLO some time to process the sent packet.
433 /* look for a received packet */
434 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
440 } while (!found && cnt);
445 /* only copy the length of the received packet */
449 err = copy_to_user(buf, pkt, len);
451 /* return the received packet to the queue */
452 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
454 return err ? -EFAULT : len;
457 static ssize_t ilo_write(struct file *fp, const char __user *buf,
458 size_t len, loff_t *off)
460 int err, pkt_id, pkt_len;
461 struct ccb_data *data = fp->private_data;
462 struct ccb *driver_ccb = &data->driver_ccb;
463 struct ilo_hwinfo *hw = data->ilo_hw;
466 if (is_channel_reset(driver_ccb))
469 /* get a packet to send the user command */
470 if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
473 /* limit the length to the length of the packet */
477 /* on failure, set the len to 0 to return empty packet to the device */
478 err = copy_from_user(pkt, buf, len);
482 /* send the packet */
483 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
484 doorbell_set(driver_ccb);
486 return err ? -EFAULT : len;
489 static int ilo_close(struct inode *ip, struct file *fp)
492 struct ccb_data *data;
493 struct ilo_hwinfo *hw;
496 slot = iminor(ip) % MAX_CCB;
497 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
499 spin_lock(&hw->open_lock);
501 if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
503 data = fp->private_data;
505 spin_lock_irqsave(&hw->alloc_lock, flags);
506 hw->ccb_alloc[slot] = NULL;
507 spin_unlock_irqrestore(&hw->alloc_lock, flags);
509 ilo_ccb_close(hw->ilo_dev, data);
513 hw->ccb_alloc[slot]->ccb_cnt--;
515 spin_unlock(&hw->open_lock);
520 static int ilo_open(struct inode *ip, struct file *fp)
523 struct ccb_data *data;
524 struct ilo_hwinfo *hw;
527 slot = iminor(ip) % MAX_CCB;
528 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
530 /* new ccb allocation */
531 data = kzalloc(sizeof(*data), GFP_KERNEL);
535 spin_lock(&hw->open_lock);
537 /* each fd private_data holds sw/hw view of ccb */
538 if (hw->ccb_alloc[slot] == NULL) {
539 /* create a channel control block for this minor */
540 error = ilo_ccb_setup(hw, data, slot);
547 data->ccb_excl = fp->f_flags & O_EXCL;
549 init_waitqueue_head(&data->ccb_waitq);
551 /* write the ccb to hw */
552 spin_lock_irqsave(&hw->alloc_lock, flags);
553 ilo_ccb_open(hw, data, slot);
554 hw->ccb_alloc[slot] = data;
555 spin_unlock_irqrestore(&hw->alloc_lock, flags);
557 /* make sure the channel is functional */
558 error = ilo_ccb_verify(hw, data);
561 spin_lock_irqsave(&hw->alloc_lock, flags);
562 hw->ccb_alloc[slot] = NULL;
563 spin_unlock_irqrestore(&hw->alloc_lock, flags);
565 ilo_ccb_close(hw->ilo_dev, data);
573 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
575 * The channel exists, and either this open
576 * or a previous open of this channel wants
581 hw->ccb_alloc[slot]->ccb_cnt++;
586 spin_unlock(&hw->open_lock);
589 fp->private_data = hw->ccb_alloc[slot];
594 static const struct file_operations ilo_fops = {
595 .owner = THIS_MODULE,
599 .release = ilo_close,
602 static irqreturn_t ilo_isr(int irq, void *data)
604 struct ilo_hwinfo *hw = data;
607 spin_lock(&hw->alloc_lock);
609 /* check for ccbs which have data */
610 pending = get_device_outbound(hw);
612 spin_unlock(&hw->alloc_lock);
616 if (is_db_reset(pending)) {
617 /* wake up all ccbs if the device was reset */
622 for (i = 0; i < MAX_CCB; i++) {
623 if (!hw->ccb_alloc[i])
625 if (pending & (1 << i))
626 wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
629 /* clear the device of the channels that have been handled */
630 clear_pending_db(hw, pending);
632 spin_unlock(&hw->alloc_lock);
637 static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
639 pci_iounmap(pdev, hw->db_vaddr);
640 pci_iounmap(pdev, hw->ram_vaddr);
641 pci_iounmap(pdev, hw->mmio_vaddr);
644 static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
648 /* map the memory mapped i/o registers */
649 hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
650 if (hw->mmio_vaddr == NULL) {
651 dev_err(&pdev->dev, "Error mapping mmio\n");
655 /* map the adapter shared memory region */
656 hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ);
657 if (hw->ram_vaddr == NULL) {
658 dev_err(&pdev->dev, "Error mapping shared mem\n");
662 /* map the doorbell aperture */
663 hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE);
664 if (hw->db_vaddr == NULL) {
665 dev_err(&pdev->dev, "Error mapping doorbell\n");
671 pci_iounmap(pdev, hw->ram_vaddr);
673 pci_iounmap(pdev, hw->mmio_vaddr);
678 static void ilo_remove(struct pci_dev *pdev)
681 struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
683 clear_device(ilo_hw);
685 minor = MINOR(ilo_hw->cdev.dev);
686 for (i = minor; i < minor + MAX_CCB; i++)
687 device_destroy(ilo_class, MKDEV(ilo_major, i));
689 cdev_del(&ilo_hw->cdev);
690 ilo_disable_interrupts(ilo_hw);
691 free_irq(pdev->irq, ilo_hw);
692 ilo_unmap_device(pdev, ilo_hw);
693 pci_release_regions(pdev);
694 pci_disable_device(pdev);
696 ilo_hwdev[(minor / MAX_CCB)] = 0;
699 static int __devinit ilo_probe(struct pci_dev *pdev,
700 const struct pci_device_id *ent)
702 int devnum, minor, start, error;
703 struct ilo_hwinfo *ilo_hw;
705 /* find a free range for device files */
706 for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
707 if (ilo_hwdev[devnum] == 0) {
708 ilo_hwdev[devnum] = 1;
713 if (devnum == MAX_ILO_DEV) {
714 dev_err(&pdev->dev, "Error finding free device\n");
718 /* track global allocations for this device */
720 ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
724 ilo_hw->ilo_dev = pdev;
725 spin_lock_init(&ilo_hw->alloc_lock);
726 spin_lock_init(&ilo_hw->fifo_lock);
727 spin_lock_init(&ilo_hw->open_lock);
729 error = pci_enable_device(pdev);
733 pci_set_master(pdev);
735 error = pci_request_regions(pdev, ILO_NAME);
739 error = ilo_map_device(pdev, ilo_hw);
743 pci_set_drvdata(pdev, ilo_hw);
744 clear_device(ilo_hw);
746 error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
750 ilo_enable_interrupts(ilo_hw);
752 cdev_init(&ilo_hw->cdev, &ilo_fops);
753 ilo_hw->cdev.owner = THIS_MODULE;
754 start = devnum * MAX_CCB;
755 error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB);
757 dev_err(&pdev->dev, "Could not add cdev\n");
761 for (minor = 0 ; minor < MAX_CCB; minor++) {
763 dev = device_create(ilo_class, &pdev->dev,
764 MKDEV(ilo_major, minor), NULL,
765 "hpilo!d%dccb%d", devnum, minor);
767 dev_err(&pdev->dev, "Could not create files\n");
772 ilo_disable_interrupts(ilo_hw);
773 free_irq(pdev->irq, ilo_hw);
775 ilo_unmap_device(pdev, ilo_hw);
777 pci_release_regions(pdev);
779 pci_disable_device(pdev);
783 ilo_hwdev[devnum] = 0;
787 static struct pci_device_id ilo_devices[] = {
788 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
789 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
792 MODULE_DEVICE_TABLE(pci, ilo_devices);
794 static struct pci_driver ilo_driver = {
796 .id_table = ilo_devices,
798 .remove = __devexit_p(ilo_remove),
801 static int __init ilo_init(void)
806 ilo_class = class_create(THIS_MODULE, "iLO");
807 if (IS_ERR(ilo_class)) {
808 error = PTR_ERR(ilo_class);
812 error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
816 ilo_major = MAJOR(dev);
818 error = pci_register_driver(&ilo_driver);
824 unregister_chrdev_region(dev, MAX_OPEN);
826 class_destroy(ilo_class);
831 static void __exit ilo_exit(void)
833 pci_unregister_driver(&ilo_driver);
834 unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
835 class_destroy(ilo_class);
838 MODULE_VERSION("1.1");
839 MODULE_ALIAS(ILO_NAME);
840 MODULE_DESCRIPTION(ILO_NAME);
841 MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
842 MODULE_LICENSE("GPL v2");
844 module_init(ilo_init);
845 module_exit(ilo_exit);