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Jiri Slabycef2cf02007-05-08 00:31:45 -07001/*
2 * Copyright (C) 2005-2007 Jiri Slaby <jirislaby@gmail.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * You need an userspace library to cooperate with this driver. It (and other
10 * info) may be obtained here:
11 * http://www.fi.muni.cz/~xslaby/phantom.html
Jiri Slabyb2afe332007-10-18 23:40:24 -070012 * or alternatively, you might use OpenHaptics provided by Sensable.
Jiri Slabycef2cf02007-05-08 00:31:45 -070013 */
14
Jiri Slaby7e4e8e62008-04-29 00:59:13 -070015#include <linux/compat.h>
Jiri Slabycef2cf02007-05-08 00:31:45 -070016#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/device.h>
19#include <linux/pci.h>
20#include <linux/fs.h>
21#include <linux/poll.h>
22#include <linux/interrupt.h>
23#include <linux/cdev.h>
24#include <linux/phantom.h>
Jonathan Corbet4541b5e2008-05-16 14:03:05 -060025#include <linux/smp_lock.h>
Jiri Slabycef2cf02007-05-08 00:31:45 -070026
27#include <asm/atomic.h>
28#include <asm/io.h>
29
Jiri Slaby82f56082008-02-06 01:38:03 -080030#define PHANTOM_VERSION "n0.9.8"
Jiri Slabycef2cf02007-05-08 00:31:45 -070031
32#define PHANTOM_MAX_MINORS 8
33
34#define PHN_IRQCTL 0x4c /* irq control in caddr space */
35
36#define PHB_RUNNING 1
Jiri Slabybc552f72007-10-18 23:40:24 -070037#define PHB_NOT_OH 2
Jiri Slabycef2cf02007-05-08 00:31:45 -070038
39static struct class *phantom_class;
40static int phantom_major;
41
42struct phantom_device {
43 unsigned int opened;
44 void __iomem *caddr;
45 u32 __iomem *iaddr;
46 u32 __iomem *oaddr;
47 unsigned long status;
48 atomic_t counter;
49
50 wait_queue_head_t wait;
51 struct cdev cdev;
52
53 struct mutex open_lock;
Jiri Slabybc552f72007-10-18 23:40:24 -070054 spinlock_t regs_lock;
55
56 /* used in NOT_OH mode */
57 struct phm_regs oregs;
58 u32 ctl_reg;
Jiri Slabycef2cf02007-05-08 00:31:45 -070059};
60
61static unsigned char phantom_devices[PHANTOM_MAX_MINORS];
62
63static int phantom_status(struct phantom_device *dev, unsigned long newstat)
64{
65 pr_debug("phantom_status %lx %lx\n", dev->status, newstat);
66
67 if (!(dev->status & PHB_RUNNING) && (newstat & PHB_RUNNING)) {
68 atomic_set(&dev->counter, 0);
69 iowrite32(PHN_CTL_IRQ, dev->iaddr + PHN_CONTROL);
70 iowrite32(0x43, dev->caddr + PHN_IRQCTL);
Jiri Slabyc8511f92007-05-23 13:57:59 -070071 ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
72 } else if ((dev->status & PHB_RUNNING) && !(newstat & PHB_RUNNING)) {
Jiri Slabycef2cf02007-05-08 00:31:45 -070073 iowrite32(0, dev->caddr + PHN_IRQCTL);
Jiri Slabyc8511f92007-05-23 13:57:59 -070074 ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
75 }
Jiri Slabycef2cf02007-05-08 00:31:45 -070076
77 dev->status = newstat;
78
79 return 0;
80}
81
82/*
83 * File ops
84 */
85
Jiri Slabyc15395c2007-05-23 13:57:58 -070086static long phantom_ioctl(struct file *file, unsigned int cmd,
87 unsigned long arg)
Jiri Slabycef2cf02007-05-08 00:31:45 -070088{
89 struct phantom_device *dev = file->private_data;
90 struct phm_regs rs;
91 struct phm_reg r;
92 void __user *argp = (void __user *)arg;
Jiri Slabybc552f72007-10-18 23:40:24 -070093 unsigned long flags;
Jiri Slabycef2cf02007-05-08 00:31:45 -070094 unsigned int i;
95
Jiri Slabycef2cf02007-05-08 00:31:45 -070096 switch (cmd) {
Jiri Slaby7e4e8e62008-04-29 00:59:13 -070097 case PHN_SETREG:
Jiri Slabycef2cf02007-05-08 00:31:45 -070098 case PHN_SET_REG:
99 if (copy_from_user(&r, argp, sizeof(r)))
100 return -EFAULT;
101
102 if (r.reg > 7)
103 return -EINVAL;
104
Jiri Slabybc552f72007-10-18 23:40:24 -0700105 spin_lock_irqsave(&dev->regs_lock, flags);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700106 if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) &&
Jiri Slabyc15395c2007-05-23 13:57:58 -0700107 phantom_status(dev, dev->status | PHB_RUNNING)){
Jiri Slabybc552f72007-10-18 23:40:24 -0700108 spin_unlock_irqrestore(&dev->regs_lock, flags);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700109 return -ENODEV;
Jiri Slabyc15395c2007-05-23 13:57:58 -0700110 }
Jiri Slabycef2cf02007-05-08 00:31:45 -0700111
112 pr_debug("phantom: writing %x to %u\n", r.value, r.reg);
Jiri Slabybc552f72007-10-18 23:40:24 -0700113
114 /* preserve amp bit (don't allow to change it when in NOT_OH) */
115 if (r.reg == PHN_CONTROL && (dev->status & PHB_NOT_OH)) {
116 r.value &= ~PHN_CTL_AMP;
117 r.value |= dev->ctl_reg & PHN_CTL_AMP;
118 dev->ctl_reg = r.value;
119 }
120
Jiri Slabycef2cf02007-05-08 00:31:45 -0700121 iowrite32(r.value, dev->iaddr + r.reg);
Jiri Slabyc8511f92007-05-23 13:57:59 -0700122 ioread32(dev->iaddr); /* PCI posting */
Jiri Slabycef2cf02007-05-08 00:31:45 -0700123
124 if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ))
125 phantom_status(dev, dev->status & ~PHB_RUNNING);
Jiri Slabybc552f72007-10-18 23:40:24 -0700126 spin_unlock_irqrestore(&dev->regs_lock, flags);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700127 break;
Jiri Slaby7e4e8e62008-04-29 00:59:13 -0700128 case PHN_SETREGS:
Jiri Slabycef2cf02007-05-08 00:31:45 -0700129 case PHN_SET_REGS:
130 if (copy_from_user(&rs, argp, sizeof(rs)))
131 return -EFAULT;
132
133 pr_debug("phantom: SRS %u regs %x\n", rs.count, rs.mask);
Jiri Slabybc552f72007-10-18 23:40:24 -0700134 spin_lock_irqsave(&dev->regs_lock, flags);
135 if (dev->status & PHB_NOT_OH)
136 memcpy(&dev->oregs, &rs, sizeof(rs));
137 else {
138 u32 m = min(rs.count, 8U);
139 for (i = 0; i < m; i++)
140 if (rs.mask & BIT(i))
141 iowrite32(rs.values[i], dev->oaddr + i);
142 ioread32(dev->iaddr); /* PCI posting */
143 }
144 spin_unlock_irqrestore(&dev->regs_lock, flags);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700145 break;
Jiri Slaby7e4e8e62008-04-29 00:59:13 -0700146 case PHN_GETREG:
Jiri Slabycef2cf02007-05-08 00:31:45 -0700147 case PHN_GET_REG:
148 if (copy_from_user(&r, argp, sizeof(r)))
149 return -EFAULT;
150
151 if (r.reg > 7)
152 return -EINVAL;
153
154 r.value = ioread32(dev->iaddr + r.reg);
155
156 if (copy_to_user(argp, &r, sizeof(r)))
157 return -EFAULT;
158 break;
Jiri Slaby7e4e8e62008-04-29 00:59:13 -0700159 case PHN_GETREGS:
Jiri Slabybc552f72007-10-18 23:40:24 -0700160 case PHN_GET_REGS: {
161 u32 m;
162
Jiri Slabycef2cf02007-05-08 00:31:45 -0700163 if (copy_from_user(&rs, argp, sizeof(rs)))
164 return -EFAULT;
165
Jiri Slabybc552f72007-10-18 23:40:24 -0700166 m = min(rs.count, 8U);
167
Jiri Slabycef2cf02007-05-08 00:31:45 -0700168 pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask);
Jiri Slabybc552f72007-10-18 23:40:24 -0700169 spin_lock_irqsave(&dev->regs_lock, flags);
170 for (i = 0; i < m; i++)
171 if (rs.mask & BIT(i))
Jiri Slabycef2cf02007-05-08 00:31:45 -0700172 rs.values[i] = ioread32(dev->iaddr + i);
Jiri Slaby7d4f9f02008-04-29 00:59:14 -0700173 atomic_set(&dev->counter, 0);
Jiri Slabybc552f72007-10-18 23:40:24 -0700174 spin_unlock_irqrestore(&dev->regs_lock, flags);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700175
176 if (copy_to_user(argp, &rs, sizeof(rs)))
177 return -EFAULT;
178 break;
Jiri Slabybc552f72007-10-18 23:40:24 -0700179 } case PHN_NOT_OH:
180 spin_lock_irqsave(&dev->regs_lock, flags);
181 if (dev->status & PHB_RUNNING) {
182 printk(KERN_ERR "phantom: you need to set NOT_OH "
183 "before you start the device!\n");
184 spin_unlock_irqrestore(&dev->regs_lock, flags);
185 return -EINVAL;
186 }
187 dev->status |= PHB_NOT_OH;
188 spin_unlock_irqrestore(&dev->regs_lock, flags);
189 break;
Jiri Slabycef2cf02007-05-08 00:31:45 -0700190 default:
191 return -ENOTTY;
192 }
193
194 return 0;
195}
196
Jiri Slaby7e4e8e62008-04-29 00:59:13 -0700197#ifdef CONFIG_COMPAT
198static long phantom_compat_ioctl(struct file *filp, unsigned int cmd,
199 unsigned long arg)
200{
201 if (_IOC_NR(cmd) <= 3 && _IOC_SIZE(cmd) == sizeof(compat_uptr_t)) {
202 cmd &= ~(_IOC_SIZEMASK << _IOC_SIZESHIFT);
203 cmd |= sizeof(void *) << _IOC_SIZESHIFT;
204 }
205 return phantom_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
206}
207#else
208#define phantom_compat_ioctl NULL
209#endif
210
Jiri Slabycef2cf02007-05-08 00:31:45 -0700211static int phantom_open(struct inode *inode, struct file *file)
212{
213 struct phantom_device *dev = container_of(inode->i_cdev,
214 struct phantom_device, cdev);
215
Jonathan Corbet4541b5e2008-05-16 14:03:05 -0600216 lock_kernel();
Jiri Slabycef2cf02007-05-08 00:31:45 -0700217 nonseekable_open(inode, file);
218
Jonathan Corbet4541b5e2008-05-16 14:03:05 -0600219 if (mutex_lock_interruptible(&dev->open_lock)) {
220 unlock_kernel();
Jiri Slabycef2cf02007-05-08 00:31:45 -0700221 return -ERESTARTSYS;
Jonathan Corbet4541b5e2008-05-16 14:03:05 -0600222 }
Jiri Slabycef2cf02007-05-08 00:31:45 -0700223
224 if (dev->opened) {
225 mutex_unlock(&dev->open_lock);
Jonathan Corbet4541b5e2008-05-16 14:03:05 -0600226 unlock_kernel();
Jiri Slabycef2cf02007-05-08 00:31:45 -0700227 return -EINVAL;
228 }
229
Jiri Slabybc552f72007-10-18 23:40:24 -0700230 WARN_ON(dev->status & PHB_NOT_OH);
231
Jiri Slabycef2cf02007-05-08 00:31:45 -0700232 file->private_data = dev;
233
Jiri Slabybc552f72007-10-18 23:40:24 -0700234 atomic_set(&dev->counter, 0);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700235 dev->opened++;
236 mutex_unlock(&dev->open_lock);
Jonathan Corbet4541b5e2008-05-16 14:03:05 -0600237 unlock_kernel();
Jiri Slabycef2cf02007-05-08 00:31:45 -0700238 return 0;
239}
240
241static int phantom_release(struct inode *inode, struct file *file)
242{
243 struct phantom_device *dev = file->private_data;
244
245 mutex_lock(&dev->open_lock);
246
247 dev->opened = 0;
248 phantom_status(dev, dev->status & ~PHB_RUNNING);
Jiri Slabybc552f72007-10-18 23:40:24 -0700249 dev->status &= ~PHB_NOT_OH;
Jiri Slabycef2cf02007-05-08 00:31:45 -0700250
251 mutex_unlock(&dev->open_lock);
252
253 return 0;
254}
255
256static unsigned int phantom_poll(struct file *file, poll_table *wait)
257{
258 struct phantom_device *dev = file->private_data;
259 unsigned int mask = 0;
260
261 pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));
262 poll_wait(file, &dev->wait, wait);
Jiri Slaby7d4f9f02008-04-29 00:59:14 -0700263
264 if (!(dev->status & PHB_RUNNING))
265 mask = POLLERR;
266 else if (atomic_read(&dev->counter))
Jiri Slabycef2cf02007-05-08 00:31:45 -0700267 mask = POLLIN | POLLRDNORM;
Jiri Slaby7d4f9f02008-04-29 00:59:14 -0700268
Jiri Slabycef2cf02007-05-08 00:31:45 -0700269 pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));
270
271 return mask;
272}
273
274static struct file_operations phantom_file_ops = {
275 .open = phantom_open,
276 .release = phantom_release,
Jiri Slabyc15395c2007-05-23 13:57:58 -0700277 .unlocked_ioctl = phantom_ioctl,
Jiri Slaby7e4e8e62008-04-29 00:59:13 -0700278 .compat_ioctl = phantom_compat_ioctl,
Jiri Slabycef2cf02007-05-08 00:31:45 -0700279 .poll = phantom_poll,
280};
281
282static irqreturn_t phantom_isr(int irq, void *data)
283{
284 struct phantom_device *dev = data;
Jiri Slabybc552f72007-10-18 23:40:24 -0700285 unsigned int i;
286 u32 ctl;
Jiri Slabycef2cf02007-05-08 00:31:45 -0700287
Jiri Slabybc552f72007-10-18 23:40:24 -0700288 spin_lock(&dev->regs_lock);
289 ctl = ioread32(dev->iaddr + PHN_CONTROL);
290 if (!(ctl & PHN_CTL_IRQ)) {
291 spin_unlock(&dev->regs_lock);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700292 return IRQ_NONE;
Jiri Slabybc552f72007-10-18 23:40:24 -0700293 }
Jiri Slabycef2cf02007-05-08 00:31:45 -0700294
295 iowrite32(0, dev->iaddr);
296 iowrite32(0xc0, dev->iaddr);
Jiri Slabybc552f72007-10-18 23:40:24 -0700297
298 if (dev->status & PHB_NOT_OH) {
299 struct phm_regs *r = &dev->oregs;
300 u32 m = min(r->count, 8U);
301
302 for (i = 0; i < m; i++)
303 if (r->mask & BIT(i))
304 iowrite32(r->values[i], dev->oaddr + i);
305
306 dev->ctl_reg ^= PHN_CTL_AMP;
307 iowrite32(dev->ctl_reg, dev->iaddr + PHN_CONTROL);
308 }
309 spin_unlock(&dev->regs_lock);
310
Jiri Slabyc8511f92007-05-23 13:57:59 -0700311 ioread32(dev->iaddr); /* PCI posting */
Jiri Slabycef2cf02007-05-08 00:31:45 -0700312
313 atomic_inc(&dev->counter);
314 wake_up_interruptible(&dev->wait);
315
316 return IRQ_HANDLED;
317}
318
319/*
320 * Init and deinit driver
321 */
322
323static unsigned int __devinit phantom_get_free(void)
324{
325 unsigned int i;
326
327 for (i = 0; i < PHANTOM_MAX_MINORS; i++)
328 if (phantom_devices[i] == 0)
329 break;
330
331 return i;
332}
333
334static int __devinit phantom_probe(struct pci_dev *pdev,
335 const struct pci_device_id *pci_id)
336{
337 struct phantom_device *pht;
338 unsigned int minor;
339 int retval;
340
341 retval = pci_enable_device(pdev);
342 if (retval)
343 goto err;
344
345 minor = phantom_get_free();
346 if (minor == PHANTOM_MAX_MINORS) {
347 dev_err(&pdev->dev, "too many devices found!\n");
348 retval = -EIO;
349 goto err_dis;
350 }
351
352 phantom_devices[minor] = 1;
353
354 retval = pci_request_regions(pdev, "phantom");
355 if (retval)
356 goto err_null;
357
358 retval = -ENOMEM;
359 pht = kzalloc(sizeof(*pht), GFP_KERNEL);
360 if (pht == NULL) {
361 dev_err(&pdev->dev, "unable to allocate device\n");
362 goto err_reg;
363 }
364
365 pht->caddr = pci_iomap(pdev, 0, 0);
366 if (pht->caddr == NULL) {
367 dev_err(&pdev->dev, "can't remap conf space\n");
368 goto err_fr;
369 }
370 pht->iaddr = pci_iomap(pdev, 2, 0);
371 if (pht->iaddr == NULL) {
372 dev_err(&pdev->dev, "can't remap input space\n");
373 goto err_unmc;
374 }
375 pht->oaddr = pci_iomap(pdev, 3, 0);
376 if (pht->oaddr == NULL) {
377 dev_err(&pdev->dev, "can't remap output space\n");
378 goto err_unmi;
379 }
380
381 mutex_init(&pht->open_lock);
Jiri Slabybc552f72007-10-18 23:40:24 -0700382 spin_lock_init(&pht->regs_lock);
Jiri Slabycef2cf02007-05-08 00:31:45 -0700383 init_waitqueue_head(&pht->wait);
384 cdev_init(&pht->cdev, &phantom_file_ops);
385 pht->cdev.owner = THIS_MODULE;
386
387 iowrite32(0, pht->caddr + PHN_IRQCTL);
Jiri Slabyc8511f92007-05-23 13:57:59 -0700388 ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
Jiri Slabycef2cf02007-05-08 00:31:45 -0700389 retval = request_irq(pdev->irq, phantom_isr,
390 IRQF_SHARED | IRQF_DISABLED, "phantom", pht);
391 if (retval) {
392 dev_err(&pdev->dev, "can't establish ISR\n");
393 goto err_unmo;
394 }
395
396 retval = cdev_add(&pht->cdev, MKDEV(phantom_major, minor), 1);
397 if (retval) {
398 dev_err(&pdev->dev, "chardev registration failed\n");
399 goto err_irq;
400 }
401
402 if (IS_ERR(device_create(phantom_class, &pdev->dev, MKDEV(phantom_major,
403 minor), "phantom%u", minor)))
404 dev_err(&pdev->dev, "can't create device\n");
405
406 pci_set_drvdata(pdev, pht);
407
408 return 0;
409err_irq:
410 free_irq(pdev->irq, pht);
411err_unmo:
412 pci_iounmap(pdev, pht->oaddr);
413err_unmi:
414 pci_iounmap(pdev, pht->iaddr);
415err_unmc:
416 pci_iounmap(pdev, pht->caddr);
417err_fr:
418 kfree(pht);
419err_reg:
420 pci_release_regions(pdev);
421err_null:
422 phantom_devices[minor] = 0;
423err_dis:
424 pci_disable_device(pdev);
425err:
426 return retval;
427}
428
429static void __devexit phantom_remove(struct pci_dev *pdev)
430{
431 struct phantom_device *pht = pci_get_drvdata(pdev);
432 unsigned int minor = MINOR(pht->cdev.dev);
433
434 device_destroy(phantom_class, MKDEV(phantom_major, minor));
435
436 cdev_del(&pht->cdev);
437
438 iowrite32(0, pht->caddr + PHN_IRQCTL);
Jiri Slabyc8511f92007-05-23 13:57:59 -0700439 ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
Jiri Slabycef2cf02007-05-08 00:31:45 -0700440 free_irq(pdev->irq, pht);
441
442 pci_iounmap(pdev, pht->oaddr);
443 pci_iounmap(pdev, pht->iaddr);
444 pci_iounmap(pdev, pht->caddr);
445
446 kfree(pht);
447
448 pci_release_regions(pdev);
449
450 phantom_devices[minor] = 0;
451
452 pci_disable_device(pdev);
453}
454
455#ifdef CONFIG_PM
456static int phantom_suspend(struct pci_dev *pdev, pm_message_t state)
457{
458 struct phantom_device *dev = pci_get_drvdata(pdev);
459
460 iowrite32(0, dev->caddr + PHN_IRQCTL);
Jiri Slabyc8511f92007-05-23 13:57:59 -0700461 ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
Jiri Slabycef2cf02007-05-08 00:31:45 -0700462
Jiri Slabyaee84472007-10-18 23:40:23 -0700463 synchronize_irq(pdev->irq);
464
Jiri Slabycef2cf02007-05-08 00:31:45 -0700465 return 0;
466}
467
468static int phantom_resume(struct pci_dev *pdev)
469{
470 struct phantom_device *dev = pci_get_drvdata(pdev);
471
472 iowrite32(0, dev->caddr + PHN_IRQCTL);
473
474 return 0;
475}
476#else
477#define phantom_suspend NULL
478#define phantom_resume NULL
479#endif
480
481static struct pci_device_id phantom_pci_tbl[] __devinitdata = {
Jiri Slaby82f56082008-02-06 01:38:03 -0800482 { .vendor = PCI_VENDOR_ID_PLX, .device = PCI_DEVICE_ID_PLX_9050,
483 .subvendor = PCI_VENDOR_ID_PLX, .subdevice = PCI_DEVICE_ID_PLX_9050,
484 .class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 },
Jiri Slabycef2cf02007-05-08 00:31:45 -0700485 { 0, }
486};
487MODULE_DEVICE_TABLE(pci, phantom_pci_tbl);
488
489static struct pci_driver phantom_pci_driver = {
490 .name = "phantom",
491 .id_table = phantom_pci_tbl,
492 .probe = phantom_probe,
493 .remove = __devexit_p(phantom_remove),
494 .suspend = phantom_suspend,
495 .resume = phantom_resume
496};
497
498static ssize_t phantom_show_version(struct class *cls, char *buf)
499{
500 return sprintf(buf, PHANTOM_VERSION "\n");
501}
502
503static CLASS_ATTR(version, 0444, phantom_show_version, NULL);
504
505static int __init phantom_init(void)
506{
507 int retval;
508 dev_t dev;
509
510 phantom_class = class_create(THIS_MODULE, "phantom");
511 if (IS_ERR(phantom_class)) {
512 retval = PTR_ERR(phantom_class);
513 printk(KERN_ERR "phantom: can't register phantom class\n");
514 goto err;
515 }
516 retval = class_create_file(phantom_class, &class_attr_version);
517 if (retval) {
518 printk(KERN_ERR "phantom: can't create sysfs version file\n");
519 goto err_class;
520 }
521
522 retval = alloc_chrdev_region(&dev, 0, PHANTOM_MAX_MINORS, "phantom");
523 if (retval) {
524 printk(KERN_ERR "phantom: can't register character device\n");
525 goto err_attr;
526 }
527 phantom_major = MAJOR(dev);
528
529 retval = pci_register_driver(&phantom_pci_driver);
530 if (retval) {
531 printk(KERN_ERR "phantom: can't register pci driver\n");
532 goto err_unchr;
533 }
534
535 printk(KERN_INFO "Phantom Linux Driver, version " PHANTOM_VERSION ", "
536 "init OK\n");
537
538 return 0;
539err_unchr:
540 unregister_chrdev_region(dev, PHANTOM_MAX_MINORS);
541err_attr:
542 class_remove_file(phantom_class, &class_attr_version);
543err_class:
544 class_destroy(phantom_class);
545err:
546 return retval;
547}
548
549static void __exit phantom_exit(void)
550{
551 pci_unregister_driver(&phantom_pci_driver);
552
553 unregister_chrdev_region(MKDEV(phantom_major, 0), PHANTOM_MAX_MINORS);
554
555 class_remove_file(phantom_class, &class_attr_version);
556 class_destroy(phantom_class);
557
558 pr_debug("phantom: module successfully removed\n");
559}
560
561module_init(phantom_init);
562module_exit(phantom_exit);
563
564MODULE_AUTHOR("Jiri Slaby <jirislaby@gmail.com>");
565MODULE_DESCRIPTION("Sensable Phantom driver");
566MODULE_LICENSE("GPL");
567MODULE_VERSION(PHANTOM_VERSION);