2 * Copyright (C) 2005-2007 Jiri Slaby <jirislaby@gmail.com>
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.
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
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/pci.h>
19 #include <linux/poll.h>
20 #include <linux/interrupt.h>
21 #include <linux/cdev.h>
22 #include <linux/phantom.h>
24 #include <asm/atomic.h>
27 #define PHANTOM_VERSION "n0.9.5"
29 #define PHANTOM_MAX_MINORS 8
31 #define PHN_IRQCTL 0x4c /* irq control in caddr space */
35 static struct class *phantom_class;
36 static int phantom_major;
38 struct phantom_device {
46 wait_queue_head_t wait;
49 struct mutex open_lock;
52 static unsigned char phantom_devices[PHANTOM_MAX_MINORS];
54 static int phantom_status(struct phantom_device *dev, unsigned long newstat)
56 pr_debug("phantom_status %lx %lx\n", dev->status, newstat);
58 if (!(dev->status & PHB_RUNNING) && (newstat & PHB_RUNNING)) {
59 atomic_set(&dev->counter, 0);
60 iowrite32(PHN_CTL_IRQ, dev->iaddr + PHN_CONTROL);
61 iowrite32(0x43, dev->caddr + PHN_IRQCTL);
62 } else if ((dev->status & PHB_RUNNING) && !(newstat & PHB_RUNNING))
63 iowrite32(0, dev->caddr + PHN_IRQCTL);
65 dev->status = newstat;
74 static int phantom_ioctl(struct inode *inode, struct file *file, u_int cmd,
77 struct phantom_device *dev = file->private_data;
80 void __user *argp = (void __user *)arg;
83 if (_IOC_TYPE(cmd) != PH_IOC_MAGIC ||
84 _IOC_NR(cmd) > PH_IOC_MAXNR)
89 if (copy_from_user(&r, argp, sizeof(r)))
95 if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) &&
96 phantom_status(dev, dev->status | PHB_RUNNING))
99 pr_debug("phantom: writing %x to %u\n", r.value, r.reg);
100 iowrite32(r.value, dev->iaddr + r.reg);
102 if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ))
103 phantom_status(dev, dev->status & ~PHB_RUNNING);
106 if (copy_from_user(&rs, argp, sizeof(rs)))
109 pr_debug("phantom: SRS %u regs %x\n", rs.count, rs.mask);
110 for (i = 0; i < min(rs.count, 8U); i++)
111 if ((1 << i) & rs.mask)
112 iowrite32(rs.values[i], dev->oaddr + i);
115 if (copy_from_user(&r, argp, sizeof(r)))
121 r.value = ioread32(dev->iaddr + r.reg);
123 if (copy_to_user(argp, &r, sizeof(r)))
127 if (copy_from_user(&rs, argp, sizeof(rs)))
130 pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask);
131 for (i = 0; i < min(rs.count, 8U); i++)
132 if ((1 << i) & rs.mask)
133 rs.values[i] = ioread32(dev->iaddr + i);
135 if (copy_to_user(argp, &rs, sizeof(rs)))
145 static int phantom_open(struct inode *inode, struct file *file)
147 struct phantom_device *dev = container_of(inode->i_cdev,
148 struct phantom_device, cdev);
150 nonseekable_open(inode, file);
152 if (mutex_lock_interruptible(&dev->open_lock))
156 mutex_unlock(&dev->open_lock);
160 file->private_data = dev;
163 mutex_unlock(&dev->open_lock);
168 static int phantom_release(struct inode *inode, struct file *file)
170 struct phantom_device *dev = file->private_data;
172 mutex_lock(&dev->open_lock);
175 phantom_status(dev, dev->status & ~PHB_RUNNING);
177 mutex_unlock(&dev->open_lock);
182 static unsigned int phantom_poll(struct file *file, poll_table *wait)
184 struct phantom_device *dev = file->private_data;
185 unsigned int mask = 0;
187 pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));
188 poll_wait(file, &dev->wait, wait);
189 if (atomic_read(&dev->counter)) {
190 mask = POLLIN | POLLRDNORM;
191 atomic_dec(&dev->counter);
192 } else if ((dev->status & PHB_RUNNING) == 0)
193 mask = POLLIN | POLLRDNORM | POLLERR;
194 pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));
199 static struct file_operations phantom_file_ops = {
200 .open = phantom_open,
201 .release = phantom_release,
202 .ioctl = phantom_ioctl,
203 .poll = phantom_poll,
206 static irqreturn_t phantom_isr(int irq, void *data)
208 struct phantom_device *dev = data;
210 if (!(ioread32(dev->iaddr + PHN_CONTROL) & PHN_CTL_IRQ))
213 iowrite32(0, dev->iaddr);
214 iowrite32(0xc0, dev->iaddr);
216 atomic_inc(&dev->counter);
217 wake_up_interruptible(&dev->wait);
223 * Init and deinit driver
226 static unsigned int __devinit phantom_get_free(void)
230 for (i = 0; i < PHANTOM_MAX_MINORS; i++)
231 if (phantom_devices[i] == 0)
237 static int __devinit phantom_probe(struct pci_dev *pdev,
238 const struct pci_device_id *pci_id)
240 struct phantom_device *pht;
244 retval = pci_enable_device(pdev);
248 minor = phantom_get_free();
249 if (minor == PHANTOM_MAX_MINORS) {
250 dev_err(&pdev->dev, "too many devices found!\n");
255 phantom_devices[minor] = 1;
257 retval = pci_request_regions(pdev, "phantom");
262 pht = kzalloc(sizeof(*pht), GFP_KERNEL);
264 dev_err(&pdev->dev, "unable to allocate device\n");
268 pht->caddr = pci_iomap(pdev, 0, 0);
269 if (pht->caddr == NULL) {
270 dev_err(&pdev->dev, "can't remap conf space\n");
273 pht->iaddr = pci_iomap(pdev, 2, 0);
274 if (pht->iaddr == NULL) {
275 dev_err(&pdev->dev, "can't remap input space\n");
278 pht->oaddr = pci_iomap(pdev, 3, 0);
279 if (pht->oaddr == NULL) {
280 dev_err(&pdev->dev, "can't remap output space\n");
284 mutex_init(&pht->open_lock);
285 init_waitqueue_head(&pht->wait);
286 cdev_init(&pht->cdev, &phantom_file_ops);
287 pht->cdev.owner = THIS_MODULE;
289 iowrite32(0, pht->caddr + PHN_IRQCTL);
290 retval = request_irq(pdev->irq, phantom_isr,
291 IRQF_SHARED | IRQF_DISABLED, "phantom", pht);
293 dev_err(&pdev->dev, "can't establish ISR\n");
297 retval = cdev_add(&pht->cdev, MKDEV(phantom_major, minor), 1);
299 dev_err(&pdev->dev, "chardev registration failed\n");
303 if (IS_ERR(device_create(phantom_class, &pdev->dev, MKDEV(phantom_major,
304 minor), "phantom%u", minor)))
305 dev_err(&pdev->dev, "can't create device\n");
307 pci_set_drvdata(pdev, pht);
311 free_irq(pdev->irq, pht);
313 pci_iounmap(pdev, pht->oaddr);
315 pci_iounmap(pdev, pht->iaddr);
317 pci_iounmap(pdev, pht->caddr);
321 pci_release_regions(pdev);
323 phantom_devices[minor] = 0;
325 pci_disable_device(pdev);
330 static void __devexit phantom_remove(struct pci_dev *pdev)
332 struct phantom_device *pht = pci_get_drvdata(pdev);
333 unsigned int minor = MINOR(pht->cdev.dev);
335 device_destroy(phantom_class, MKDEV(phantom_major, minor));
337 cdev_del(&pht->cdev);
339 iowrite32(0, pht->caddr + PHN_IRQCTL);
340 free_irq(pdev->irq, pht);
342 pci_iounmap(pdev, pht->oaddr);
343 pci_iounmap(pdev, pht->iaddr);
344 pci_iounmap(pdev, pht->caddr);
348 pci_release_regions(pdev);
350 phantom_devices[minor] = 0;
352 pci_disable_device(pdev);
356 static int phantom_suspend(struct pci_dev *pdev, pm_message_t state)
358 struct phantom_device *dev = pci_get_drvdata(pdev);
360 iowrite32(0, dev->caddr + PHN_IRQCTL);
365 static int phantom_resume(struct pci_dev *pdev)
367 struct phantom_device *dev = pci_get_drvdata(pdev);
369 iowrite32(0, dev->caddr + PHN_IRQCTL);
374 #define phantom_suspend NULL
375 #define phantom_resume NULL
378 static struct pci_device_id phantom_pci_tbl[] __devinitdata = {
379 { PCI_DEVICE(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050),
380 .class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 },
383 MODULE_DEVICE_TABLE(pci, phantom_pci_tbl);
385 static struct pci_driver phantom_pci_driver = {
387 .id_table = phantom_pci_tbl,
388 .probe = phantom_probe,
389 .remove = __devexit_p(phantom_remove),
390 .suspend = phantom_suspend,
391 .resume = phantom_resume
394 static ssize_t phantom_show_version(struct class *cls, char *buf)
396 return sprintf(buf, PHANTOM_VERSION "\n");
399 static CLASS_ATTR(version, 0444, phantom_show_version, NULL);
401 static int __init phantom_init(void)
406 phantom_class = class_create(THIS_MODULE, "phantom");
407 if (IS_ERR(phantom_class)) {
408 retval = PTR_ERR(phantom_class);
409 printk(KERN_ERR "phantom: can't register phantom class\n");
412 retval = class_create_file(phantom_class, &class_attr_version);
414 printk(KERN_ERR "phantom: can't create sysfs version file\n");
418 retval = alloc_chrdev_region(&dev, 0, PHANTOM_MAX_MINORS, "phantom");
420 printk(KERN_ERR "phantom: can't register character device\n");
423 phantom_major = MAJOR(dev);
425 retval = pci_register_driver(&phantom_pci_driver);
427 printk(KERN_ERR "phantom: can't register pci driver\n");
431 printk(KERN_INFO "Phantom Linux Driver, version " PHANTOM_VERSION ", "
436 unregister_chrdev_region(dev, PHANTOM_MAX_MINORS);
438 class_remove_file(phantom_class, &class_attr_version);
440 class_destroy(phantom_class);
445 static void __exit phantom_exit(void)
447 pci_unregister_driver(&phantom_pci_driver);
449 unregister_chrdev_region(MKDEV(phantom_major, 0), PHANTOM_MAX_MINORS);
451 class_remove_file(phantom_class, &class_attr_version);
452 class_destroy(phantom_class);
454 pr_debug("phantom: module successfully removed\n");
457 module_init(phantom_init);
458 module_exit(phantom_exit);
460 MODULE_AUTHOR("Jiri Slaby <jirislaby@gmail.com>");
461 MODULE_DESCRIPTION("Sensable Phantom driver");
462 MODULE_LICENSE("GPL");
463 MODULE_VERSION(PHANTOM_VERSION);