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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/compat.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/device.h>#include <linux/pci.h>#include <linux/fs.h>#include <linux/poll.h>#include <linux/interrupt.h>#include <linux/cdev.h>#include <linux/slab.h>#include <linux/phantom.h>#include <linux/sched.h>#include <linux/mutex.h>
#include <linux/atomic.h>#include <asm/io.h>
#define PHANTOM_VERSION "n0.9.8"
#define PHANTOM_MAX_MINORS 8
#define PHN_IRQCTL 0x4c /* irq control in caddr space */
#define PHB_RUNNING 1#define PHB_NOT_OH 2
static DEFINE_MUTEX(phantom_mutex);static int phantom_major;
static const struct class phantom_class = { .name = "phantom",};
struct phantom_device { unsigned int opened; void __iomem *caddr; u32 __iomem *iaddr; u32 __iomem *oaddr; unsigned long status; atomic_t counter;
wait_queue_head_t wait; struct cdev cdev;
struct mutex open_lock; spinlock_t regs_lock;
/* used in NOT_OH mode */ struct phm_regs oregs; u32 ctl_reg;};
static unsigned char phantom_devices[PHANTOM_MAX_MINORS];
static int phantom_status(struct phantom_device *dev, unsigned long newstat){ pr_debug("phantom_status %lx %lx\n", dev->status, newstat);
if (!(dev->status & PHB_RUNNING) && (newstat & PHB_RUNNING)) { atomic_set(&dev->counter, 0); iowrite32(PHN_CTL_IRQ, dev->iaddr + PHN_CONTROL); iowrite32(0x43, dev->caddr + PHN_IRQCTL); ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */ } else if ((dev->status & PHB_RUNNING) && !(newstat & PHB_RUNNING)) { iowrite32(0, dev->caddr + PHN_IRQCTL); ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */ }
dev->status = newstat;
return 0;}
/* * File ops */
static long phantom_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ struct phantom_device *dev = file->private_data; struct phm_regs rs; struct phm_reg r; void __user *argp = (void __user *)arg; unsigned long flags; unsigned int i;
switch (cmd) { case PHN_SETREG: case PHN_SET_REG: if (copy_from_user(&r, argp, sizeof(r))) return -EFAULT;
if (r.reg > 7) return -EINVAL;
spin_lock_irqsave(&dev->regs_lock, flags); if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) && phantom_status(dev, dev->status | PHB_RUNNING)){ spin_unlock_irqrestore(&dev->regs_lock, flags); return -ENODEV; }
pr_debug("phantom: writing %x to %u\n", r.value, r.reg);
/* preserve amp bit (don't allow to change it when in NOT_OH) */ if (r.reg == PHN_CONTROL && (dev->status & PHB_NOT_OH)) { r.value &= ~PHN_CTL_AMP; r.value |= dev->ctl_reg & PHN_CTL_AMP; dev->ctl_reg = r.value; }
iowrite32(r.value, dev->iaddr + r.reg); ioread32(dev->iaddr); /* PCI posting */
if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ)) phantom_status(dev, dev->status & ~PHB_RUNNING); spin_unlock_irqrestore(&dev->regs_lock, flags); break; case PHN_SETREGS: case PHN_SET_REGS: if (copy_from_user(&rs, argp, sizeof(rs))) return -EFAULT;
pr_debug("phantom: SRS %u regs %x\n", rs.count, rs.mask); spin_lock_irqsave(&dev->regs_lock, flags); if (dev->status & PHB_NOT_OH) memcpy(&dev->oregs, &rs, sizeof(rs)); else { u32 m = min(rs.count, 8U); for (i = 0; i < m; i++) if (rs.mask & BIT(i)) iowrite32(rs.values[i], dev->oaddr + i); ioread32(dev->iaddr); /* PCI posting */ } spin_unlock_irqrestore(&dev->regs_lock, flags); break; case PHN_GETREG: case PHN_GET_REG: if (copy_from_user(&r, argp, sizeof(r))) return -EFAULT;
if (r.reg > 7) return -EINVAL;
r.value = ioread32(dev->iaddr + r.reg);
if (copy_to_user(argp, &r, sizeof(r))) return -EFAULT; break; case PHN_GETREGS: case PHN_GET_REGS: { u32 m;
if (copy_from_user(&rs, argp, sizeof(rs))) return -EFAULT;
m = min(rs.count, 8U);
pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask); spin_lock_irqsave(&dev->regs_lock, flags); for (i = 0; i < m; i++) if (rs.mask & BIT(i)) rs.values[i] = ioread32(dev->iaddr + i); atomic_set(&dev->counter, 0); spin_unlock_irqrestore(&dev->regs_lock, flags);
if (copy_to_user(argp, &rs, sizeof(rs))) return -EFAULT; break; } case PHN_NOT_OH: spin_lock_irqsave(&dev->regs_lock, flags); if (dev->status & PHB_RUNNING) { printk(KERN_ERR "phantom: you need to set NOT_OH " "before you start the device!\n"); spin_unlock_irqrestore(&dev->regs_lock, flags); return -EINVAL; } dev->status |= PHB_NOT_OH; spin_unlock_irqrestore(&dev->regs_lock, flags); break; default: return -ENOTTY; }
return 0;}
#ifdef CONFIG_COMPATstatic long phantom_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg){ if (_IOC_NR(cmd) <= 3 && _IOC_SIZE(cmd) == sizeof(compat_uptr_t)) { cmd &= ~(_IOC_SIZEMASK << _IOC_SIZESHIFT); cmd |= sizeof(void *) << _IOC_SIZESHIFT; } return phantom_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));}#else#define phantom_compat_ioctl NULL#endif
static int phantom_open(struct inode *inode, struct file *file){ struct phantom_device *dev = container_of(inode->i_cdev, struct phantom_device, cdev);
mutex_lock(&phantom_mutex); nonseekable_open(inode, file);
if (mutex_lock_interruptible(&dev->open_lock)) { mutex_unlock(&phantom_mutex); return -ERESTARTSYS; }
if (dev->opened) { mutex_unlock(&dev->open_lock); mutex_unlock(&phantom_mutex); return -EINVAL; }
WARN_ON(dev->status & PHB_NOT_OH);
file->private_data = dev;
atomic_set(&dev->counter, 0); dev->opened++; mutex_unlock(&dev->open_lock); mutex_unlock(&phantom_mutex); return 0;}
static int phantom_release(struct inode *inode, struct file *file){ struct phantom_device *dev = file->private_data;
mutex_lock(&dev->open_lock);
dev->opened = 0; phantom_status(dev, dev->status & ~PHB_RUNNING); dev->status &= ~PHB_NOT_OH;
mutex_unlock(&dev->open_lock);
return 0;}
static __poll_t phantom_poll(struct file *file, poll_table *wait){ struct phantom_device *dev = file->private_data; __poll_t mask = 0;
pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter)); poll_wait(file, &dev->wait, wait);
if (!(dev->status & PHB_RUNNING)) mask = EPOLLERR; else if (atomic_read(&dev->counter)) mask = EPOLLIN | EPOLLRDNORM;
pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));
return mask;}
static const struct file_operations phantom_file_ops = { .open = phantom_open, .release = phantom_release, .unlocked_ioctl = phantom_ioctl, .compat_ioctl = phantom_compat_ioctl, .poll = phantom_poll,};
static irqreturn_t phantom_isr(int irq, void *data){ struct phantom_device *dev = data; unsigned int i; u32 ctl;
spin_lock(&dev->regs_lock); ctl = ioread32(dev->iaddr + PHN_CONTROL); if (!(ctl & PHN_CTL_IRQ)) { spin_unlock(&dev->regs_lock); return IRQ_NONE; }
iowrite32(0, dev->iaddr); iowrite32(0xc0, dev->iaddr);
if (dev->status & PHB_NOT_OH) { struct phm_regs *r = &dev->oregs; u32 m = min(r->count, 8U);
for (i = 0; i < m; i++) if (r->mask & BIT(i)) iowrite32(r->values[i], dev->oaddr + i);
dev->ctl_reg ^= PHN_CTL_AMP; iowrite32(dev->ctl_reg, dev->iaddr + PHN_CONTROL); } spin_unlock(&dev->regs_lock);
ioread32(dev->iaddr); /* PCI posting */
atomic_inc(&dev->counter); wake_up_interruptible(&dev->wait);
return IRQ_HANDLED;}
/* * Init and deinit driver */
static unsigned int phantom_get_free(void){ unsigned int i;
for (i = 0; i < PHANTOM_MAX_MINORS; i++) if (phantom_devices[i] == 0) break;
return i;}
static int phantom_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id){ struct phantom_device *pht; unsigned int minor; int retval;
retval = pci_enable_device(pdev); if (retval) { dev_err(&pdev->dev, "pci_enable_device failed!\n"); goto err; }
minor = phantom_get_free(); if (minor == PHANTOM_MAX_MINORS) { dev_err(&pdev->dev, "too many devices found!\n"); retval = -EIO; goto err_dis; }
phantom_devices[minor] = 1;
retval = pci_request_regions(pdev, "phantom"); if (retval) { dev_err(&pdev->dev, "pci_request_regions failed!\n"); goto err_null; }
retval = -ENOMEM; pht = kzalloc_obj(*pht); if (pht == NULL) { dev_err(&pdev->dev, "unable to allocate device\n"); goto err_reg; }
pht->caddr = pci_iomap(pdev, 0, 0); if (pht->caddr == NULL) { dev_err(&pdev->dev, "can't remap conf space\n"); goto err_fr; } pht->iaddr = pci_iomap(pdev, 2, 0); if (pht->iaddr == NULL) { dev_err(&pdev->dev, "can't remap input space\n"); goto err_unmc; } pht->oaddr = pci_iomap(pdev, 3, 0); if (pht->oaddr == NULL) { dev_err(&pdev->dev, "can't remap output space\n"); goto err_unmi; }
mutex_init(&pht->open_lock); spin_lock_init(&pht->regs_lock); init_waitqueue_head(&pht->wait); cdev_init(&pht->cdev, &phantom_file_ops); pht->cdev.owner = THIS_MODULE;
iowrite32(0, pht->caddr + PHN_IRQCTL); ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */ retval = request_irq(pdev->irq, phantom_isr, IRQF_SHARED, "phantom", pht); if (retval) { dev_err(&pdev->dev, "can't establish ISR\n"); goto err_unmo; }
retval = cdev_add(&pht->cdev, MKDEV(phantom_major, minor), 1); if (retval) { dev_err(&pdev->dev, "chardev registration failed\n"); goto err_irq; }
if (IS_ERR(device_create(&phantom_class, &pdev->dev, MKDEV(phantom_major, minor), NULL, "phantom%u", minor))) dev_err(&pdev->dev, "can't create device\n");
pci_set_drvdata(pdev, pht);
return 0;err_irq: free_irq(pdev->irq, pht);err_unmo: pci_iounmap(pdev, pht->oaddr);err_unmi: pci_iounmap(pdev, pht->iaddr);err_unmc: pci_iounmap(pdev, pht->caddr);err_fr: kfree(pht);err_reg: pci_release_regions(pdev);err_null: phantom_devices[minor] = 0;err_dis: pci_disable_device(pdev);err: return retval;}
static void phantom_remove(struct pci_dev *pdev){ struct phantom_device *pht = pci_get_drvdata(pdev); unsigned int minor = MINOR(pht->cdev.dev);
device_destroy(&phantom_class, MKDEV(phantom_major, minor));
cdev_del(&pht->cdev);
iowrite32(0, pht->caddr + PHN_IRQCTL); ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */ free_irq(pdev->irq, pht);
pci_iounmap(pdev, pht->oaddr); pci_iounmap(pdev, pht->iaddr); pci_iounmap(pdev, pht->caddr);
kfree(pht);
pci_release_regions(pdev);
phantom_devices[minor] = 0;
pci_disable_device(pdev);}
static int phantom_suspend(struct device *dev_d){ struct phantom_device *dev = dev_get_drvdata(dev_d);
iowrite32(0, dev->caddr + PHN_IRQCTL); ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
synchronize_irq(to_pci_dev(dev_d)->irq);
return 0;}
static int phantom_resume(struct device *dev_d){ struct phantom_device *dev = dev_get_drvdata(dev_d);
iowrite32(0, dev->caddr + PHN_IRQCTL);
return 0;}
static struct pci_device_id phantom_pci_tbl[] = { { PCI_DEVICE_SUB(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050, PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050), .class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 }, { }};MODULE_DEVICE_TABLE(pci, phantom_pci_tbl);
static DEFINE_SIMPLE_DEV_PM_OPS(phantom_pm_ops, phantom_suspend, phantom_resume);
static struct pci_driver phantom_pci_driver = { .name = "phantom", .id_table = phantom_pci_tbl, .probe = phantom_probe, .remove = phantom_remove, .driver.pm = pm_sleep_ptr(&phantom_pm_ops),};
static CLASS_ATTR_STRING(version, 0444, PHANTOM_VERSION);
static int __init phantom_init(void){ int retval; dev_t dev;
retval = class_register(&phantom_class); if (retval) { printk(KERN_ERR "phantom: can't register phantom class\n"); goto err; } retval = class_create_file(&phantom_class, &class_attr_version.attr); if (retval) { printk(KERN_ERR "phantom: can't create sysfs version file\n"); goto err_class; }
retval = alloc_chrdev_region(&dev, 0, PHANTOM_MAX_MINORS, "phantom"); if (retval) { printk(KERN_ERR "phantom: can't register character device\n"); goto err_attr; } phantom_major = MAJOR(dev);
retval = pci_register_driver(&phantom_pci_driver); if (retval) { printk(KERN_ERR "phantom: can't register pci driver\n"); goto err_unchr; }
printk(KERN_INFO "Phantom Linux Driver, version " PHANTOM_VERSION ", " "init OK\n");
return 0;err_unchr: unregister_chrdev_region(dev, PHANTOM_MAX_MINORS);err_attr: class_remove_file(&phantom_class, &class_attr_version.attr);err_class: class_unregister(&phantom_class);err: return retval;}
static void __exit phantom_exit(void){ pci_unregister_driver(&phantom_pci_driver);
unregister_chrdev_region(MKDEV(phantom_major, 0), PHANTOM_MAX_MINORS);
class_remove_file(&phantom_class, &class_attr_version.attr); class_unregister(&phantom_class);
pr_debug("phantom: module successfully removed\n");}
module_init(phantom_init);module_exit(phantom_exit);
MODULE_AUTHOR("Jiri Slaby <jirislaby@gmail.com>");MODULE_DESCRIPTION("Sensable Phantom driver (PCI devices)");MODULE_LICENSE("GPL");MODULE_VERSION(PHANTOM_VERSION);