/* *  Copyright (C) 2005-2007 Jiri Slaby <jirislaby@gmail.com> * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  You need an userspace library to cooperate with this driver. It (and other *  info) may be obtained here: *  http://www.fi.muni.cz/~xslaby/phantom.html */ #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/phantom.h> #include <asm/atomic.h>#include <asm/io.h> #define PHANTOM_VERSION		"n0.9.5" #define PHANTOM_MAX_MINORS	8 #define PHN_IRQCTL		0x4c    /* irq control in caddr space */ #define PHB_RUNNING		1 static struct class *phantom_class;static int phantom_major; 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 ioctl_lock;}; 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 int i; 	if (_IOC_TYPE(cmd) != PH_IOC_MAGIC ||			_IOC_NR(cmd) > PH_IOC_MAXNR)		return -ENOTTY; 	switch (cmd) {	case PHN_SET_REG:		if (copy_from_user(&r, argp, sizeof(r)))			return -EFAULT; 		if (r.reg > 7)			return -EINVAL; 		spin_lock(&dev->ioctl_lock);		if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) &&				phantom_status(dev, dev->status | PHB_RUNNING)){			spin_unlock(&dev->ioctl_lock);			return -ENODEV;		} 		pr_debug("phantom: writing %x to %u\n", r.value, r.reg);		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(&dev->ioctl_lock);		break;	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(&dev->ioctl_lock);		for (i = 0; i < min(rs.count, 8U); i++)			if ((1 << i) & rs.mask)				iowrite32(rs.values[i], dev->oaddr + i);		ioread32(dev->iaddr); /* PCI posting */		spin_unlock(&dev->ioctl_lock);		break;	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_GET_REGS:		if (copy_from_user(&rs, argp, sizeof(rs)))			return -EFAULT; 		pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask);		spin_lock(&dev->ioctl_lock);		for (i = 0; i < min(rs.count, 8U); i++)			if ((1 << i) & rs.mask)				rs.values[i] = ioread32(dev->iaddr + i);		spin_unlock(&dev->ioctl_lock); 		if (copy_to_user(argp, &rs, sizeof(rs)))			return -EFAULT;		break;	default:		return -ENOTTY;	} 	return 0;} static int phantom_open(struct inode *inode, struct file *file){	struct phantom_device *dev = container_of(inode->i_cdev,			struct phantom_device, cdev); 	nonseekable_open(inode, file); 	if (mutex_lock_interruptible(&dev->open_lock))		return -ERESTARTSYS; 	if (dev->opened) {		mutex_unlock(&dev->open_lock);		return -EINVAL;	} 	file->private_data = dev; 	dev->opened++;	mutex_unlock(&dev->open_lock); 	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); 	mutex_unlock(&dev->open_lock); 	return 0;} static unsigned int phantom_poll(struct file *file, poll_table *wait){	struct phantom_device *dev = file->private_data;	unsigned int mask = 0; 	pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));	poll_wait(file, &dev->wait, wait);	if (atomic_read(&dev->counter)) {		mask = POLLIN | POLLRDNORM;		atomic_dec(&dev->counter);	} else if ((dev->status & PHB_RUNNING) == 0)		mask = POLLIN | POLLRDNORM | POLLERR;	pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter)); 	return mask;} static struct file_operations phantom_file_ops = {	.open = phantom_open,	.release = phantom_release,	.unlocked_ioctl = phantom_ioctl,	.poll = phantom_poll,}; static irqreturn_t phantom_isr(int irq, void *data){	struct phantom_device *dev = data; 	if (!(ioread32(dev->iaddr + PHN_CONTROL) & PHN_CTL_IRQ))		return IRQ_NONE; 	iowrite32(0, dev->iaddr);	iowrite32(0xc0, dev->iaddr);	ioread32(dev->iaddr); /* PCI posting */ 	atomic_inc(&dev->counter);	wake_up_interruptible(&dev->wait); 	return IRQ_HANDLED;} /* * Init and deinit driver */ static unsigned int __devinit 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 __devinit 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)		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)		goto err_null; 	retval = -ENOMEM;	pht = kzalloc(sizeof(*pht), GFP_KERNEL);	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->ioctl_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 | IRQF_DISABLED, "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), "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 __devexit 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);} #ifdef CONFIG_PMstatic int phantom_suspend(struct pci_dev *pdev, pm_message_t state){	struct phantom_device *dev = pci_get_drvdata(pdev); 	iowrite32(0, dev->caddr + PHN_IRQCTL);	ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */ 	return 0;} static int phantom_resume(struct pci_dev *pdev){	struct phantom_device *dev = pci_get_drvdata(pdev); 	iowrite32(0, dev->caddr + PHN_IRQCTL); 	return 0;}#else#define phantom_suspend	NULL#define phantom_resume	NULL#endif static struct pci_device_id phantom_pci_tbl[] __devinitdata = {	{ PCI_DEVICE(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050),		.class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 },	{ 0, }};MODULE_DEVICE_TABLE(pci, phantom_pci_tbl); static struct pci_driver phantom_pci_driver = {	.name = "phantom",	.id_table = phantom_pci_tbl,	.probe = phantom_probe,	.remove = __devexit_p(phantom_remove),	.suspend = phantom_suspend,	.resume = phantom_resume}; static ssize_t phantom_show_version(struct class *cls, char *buf){	return sprintf(buf, PHANTOM_VERSION "\n");} static CLASS_ATTR(version, 0444, phantom_show_version, NULL); static int __init phantom_init(void){	int retval;	dev_t dev; 	phantom_class = class_create(THIS_MODULE, "phantom");	if (IS_ERR(phantom_class)) {		retval = PTR_ERR(phantom_class);		printk(KERN_ERR "phantom: can't register phantom class\n");		goto err;	}	retval = class_create_file(phantom_class, &class_attr_version);	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);err_class:	class_destroy(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);	class_destroy(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");MODULE_LICENSE("GPL");MODULE_VERSION(PHANTOM_VERSION);