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;
50 spinlock_t ioctl_lock;
53 static unsigned char phantom_devices[PHANTOM_MAX_MINORS];
55 static int phantom_status(struct phantom_device *dev, unsigned long newstat)
57 pr_debug("phantom_status %lx %lx\n", dev->status, newstat);
59 if (!(dev->status & PHB_RUNNING) && (newstat & PHB_RUNNING)) {
60 atomic_set(&dev->counter, 0);
61 iowrite32(PHN_CTL_IRQ, dev->iaddr + PHN_CONTROL);
62 iowrite32(0x43, dev->caddr + PHN_IRQCTL);
63 ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
64 } else if ((dev->status & PHB_RUNNING) && !(newstat & PHB_RUNNING)) {
65 iowrite32(0, dev->caddr + PHN_IRQCTL);
66 ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
69 dev->status = newstat;
78 static long phantom_ioctl(struct file *file, unsigned int cmd,
81 struct phantom_device *dev = file->private_data;
84 void __user *argp = (void __user *)arg;
87 if (_IOC_TYPE(cmd) != PH_IOC_MAGIC ||
88 _IOC_NR(cmd) > PH_IOC_MAXNR)
93 if (copy_from_user(&r, argp, sizeof(r)))
99 spin_lock(&dev->ioctl_lock);
100 if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) &&
101 phantom_status(dev, dev->status | PHB_RUNNING)){
102 spin_unlock(&dev->ioctl_lock);
106 pr_debug("phantom: writing %x to %u\n", r.value, r.reg);
107 iowrite32(r.value, dev->iaddr + r.reg);
108 ioread32(dev->iaddr); /* PCI posting */
110 if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ))
111 phantom_status(dev, dev->status & ~PHB_RUNNING);
112 spin_unlock(&dev->ioctl_lock);
115 if (copy_from_user(&rs, argp, sizeof(rs)))
118 pr_debug("phantom: SRS %u regs %x\n", rs.count, rs.mask);
119 spin_lock(&dev->ioctl_lock);
120 for (i = 0; i < min(rs.count, 8U); i++)
121 if ((1 << i) & rs.mask)
122 iowrite32(rs.values[i], dev->oaddr + i);
123 ioread32(dev->iaddr); /* PCI posting */
124 spin_unlock(&dev->ioctl_lock);
127 if (copy_from_user(&r, argp, sizeof(r)))
133 r.value = ioread32(dev->iaddr + r.reg);
135 if (copy_to_user(argp, &r, sizeof(r)))
139 if (copy_from_user(&rs, argp, sizeof(rs)))
142 pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask);
143 spin_lock(&dev->ioctl_lock);
144 for (i = 0; i < min(rs.count, 8U); i++)
145 if ((1 << i) & rs.mask)
146 rs.values[i] = ioread32(dev->iaddr + i);
147 spin_unlock(&dev->ioctl_lock);
149 if (copy_to_user(argp, &rs, sizeof(rs)))
159 static int phantom_open(struct inode *inode, struct file *file)
161 struct phantom_device *dev = container_of(inode->i_cdev,
162 struct phantom_device, cdev);
164 nonseekable_open(inode, file);
166 if (mutex_lock_interruptible(&dev->open_lock))
170 mutex_unlock(&dev->open_lock);
174 file->private_data = dev;
177 mutex_unlock(&dev->open_lock);
182 static int phantom_release(struct inode *inode, struct file *file)
184 struct phantom_device *dev = file->private_data;
186 mutex_lock(&dev->open_lock);
189 phantom_status(dev, dev->status & ~PHB_RUNNING);
191 mutex_unlock(&dev->open_lock);
196 static unsigned int phantom_poll(struct file *file, poll_table *wait)
198 struct phantom_device *dev = file->private_data;
199 unsigned int mask = 0;
201 pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));
202 poll_wait(file, &dev->wait, wait);
203 if (atomic_read(&dev->counter)) {
204 mask = POLLIN | POLLRDNORM;
205 atomic_dec(&dev->counter);
206 } else if ((dev->status & PHB_RUNNING) == 0)
207 mask = POLLIN | POLLRDNORM | POLLERR;
208 pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));
213 static struct file_operations phantom_file_ops = {
214 .open = phantom_open,
215 .release = phantom_release,
216 .unlocked_ioctl = phantom_ioctl,
217 .poll = phantom_poll,
220 static irqreturn_t phantom_isr(int irq, void *data)
222 struct phantom_device *dev = data;
224 if (!(ioread32(dev->iaddr + PHN_CONTROL) & PHN_CTL_IRQ))
227 iowrite32(0, dev->iaddr);
228 iowrite32(0xc0, dev->iaddr);
229 ioread32(dev->iaddr); /* PCI posting */
231 atomic_inc(&dev->counter);
232 wake_up_interruptible(&dev->wait);
238 * Init and deinit driver
241 static unsigned int __devinit phantom_get_free(void)
245 for (i = 0; i < PHANTOM_MAX_MINORS; i++)
246 if (phantom_devices[i] == 0)
252 static int __devinit phantom_probe(struct pci_dev *pdev,
253 const struct pci_device_id *pci_id)
255 struct phantom_device *pht;
259 retval = pci_enable_device(pdev);
263 minor = phantom_get_free();
264 if (minor == PHANTOM_MAX_MINORS) {
265 dev_err(&pdev->dev, "too many devices found!\n");
270 phantom_devices[minor] = 1;
272 retval = pci_request_regions(pdev, "phantom");
277 pht = kzalloc(sizeof(*pht), GFP_KERNEL);
279 dev_err(&pdev->dev, "unable to allocate device\n");
283 pht->caddr = pci_iomap(pdev, 0, 0);
284 if (pht->caddr == NULL) {
285 dev_err(&pdev->dev, "can't remap conf space\n");
288 pht->iaddr = pci_iomap(pdev, 2, 0);
289 if (pht->iaddr == NULL) {
290 dev_err(&pdev->dev, "can't remap input space\n");
293 pht->oaddr = pci_iomap(pdev, 3, 0);
294 if (pht->oaddr == NULL) {
295 dev_err(&pdev->dev, "can't remap output space\n");
299 mutex_init(&pht->open_lock);
300 spin_lock_init(&pht->ioctl_lock);
301 init_waitqueue_head(&pht->wait);
302 cdev_init(&pht->cdev, &phantom_file_ops);
303 pht->cdev.owner = THIS_MODULE;
305 iowrite32(0, pht->caddr + PHN_IRQCTL);
306 ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
307 retval = request_irq(pdev->irq, phantom_isr,
308 IRQF_SHARED | IRQF_DISABLED, "phantom", pht);
310 dev_err(&pdev->dev, "can't establish ISR\n");
314 retval = cdev_add(&pht->cdev, MKDEV(phantom_major, minor), 1);
316 dev_err(&pdev->dev, "chardev registration failed\n");
320 if (IS_ERR(device_create(phantom_class, &pdev->dev, MKDEV(phantom_major,
321 minor), "phantom%u", minor)))
322 dev_err(&pdev->dev, "can't create device\n");
324 pci_set_drvdata(pdev, pht);
328 free_irq(pdev->irq, pht);
330 pci_iounmap(pdev, pht->oaddr);
332 pci_iounmap(pdev, pht->iaddr);
334 pci_iounmap(pdev, pht->caddr);
338 pci_release_regions(pdev);
340 phantom_devices[minor] = 0;
342 pci_disable_device(pdev);
347 static void __devexit phantom_remove(struct pci_dev *pdev)
349 struct phantom_device *pht = pci_get_drvdata(pdev);
350 unsigned int minor = MINOR(pht->cdev.dev);
352 device_destroy(phantom_class, MKDEV(phantom_major, minor));
354 cdev_del(&pht->cdev);
356 iowrite32(0, pht->caddr + PHN_IRQCTL);
357 ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
358 free_irq(pdev->irq, pht);
360 pci_iounmap(pdev, pht->oaddr);
361 pci_iounmap(pdev, pht->iaddr);
362 pci_iounmap(pdev, pht->caddr);
366 pci_release_regions(pdev);
368 phantom_devices[minor] = 0;
370 pci_disable_device(pdev);
374 static int phantom_suspend(struct pci_dev *pdev, pm_message_t state)
376 struct phantom_device *dev = pci_get_drvdata(pdev);
378 iowrite32(0, dev->caddr + PHN_IRQCTL);
379 ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
384 static int phantom_resume(struct pci_dev *pdev)
386 struct phantom_device *dev = pci_get_drvdata(pdev);
388 iowrite32(0, dev->caddr + PHN_IRQCTL);
393 #define phantom_suspend NULL
394 #define phantom_resume NULL
397 static struct pci_device_id phantom_pci_tbl[] __devinitdata = {
398 { PCI_DEVICE(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050),
399 .class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 },
402 MODULE_DEVICE_TABLE(pci, phantom_pci_tbl);
404 static struct pci_driver phantom_pci_driver = {
406 .id_table = phantom_pci_tbl,
407 .probe = phantom_probe,
408 .remove = __devexit_p(phantom_remove),
409 .suspend = phantom_suspend,
410 .resume = phantom_resume
413 static ssize_t phantom_show_version(struct class *cls, char *buf)
415 return sprintf(buf, PHANTOM_VERSION "\n");
418 static CLASS_ATTR(version, 0444, phantom_show_version, NULL);
420 static int __init phantom_init(void)
425 phantom_class = class_create(THIS_MODULE, "phantom");
426 if (IS_ERR(phantom_class)) {
427 retval = PTR_ERR(phantom_class);
428 printk(KERN_ERR "phantom: can't register phantom class\n");
431 retval = class_create_file(phantom_class, &class_attr_version);
433 printk(KERN_ERR "phantom: can't create sysfs version file\n");
437 retval = alloc_chrdev_region(&dev, 0, PHANTOM_MAX_MINORS, "phantom");
439 printk(KERN_ERR "phantom: can't register character device\n");
442 phantom_major = MAJOR(dev);
444 retval = pci_register_driver(&phantom_pci_driver);
446 printk(KERN_ERR "phantom: can't register pci driver\n");
450 printk(KERN_INFO "Phantom Linux Driver, version " PHANTOM_VERSION ", "
455 unregister_chrdev_region(dev, PHANTOM_MAX_MINORS);
457 class_remove_file(phantom_class, &class_attr_version);
459 class_destroy(phantom_class);
464 static void __exit phantom_exit(void)
466 pci_unregister_driver(&phantom_pci_driver);
468 unregister_chrdev_region(MKDEV(phantom_major, 0), PHANTOM_MAX_MINORS);
470 class_remove_file(phantom_class, &class_attr_version);
471 class_destroy(phantom_class);
473 pr_debug("phantom: module successfully removed\n");
476 module_init(phantom_init);
477 module_exit(phantom_exit);
479 MODULE_AUTHOR("Jiri Slaby <jirislaby@gmail.com>");
480 MODULE_DESCRIPTION("Sensable Phantom driver");
481 MODULE_LICENSE("GPL");
482 MODULE_VERSION(PHANTOM_VERSION);