[linux.git] / drivers / misc / phantom.c

/*
 *  Copyright (C) 2005-2007 Jiri Slaby <[email protected]>
 *
 *  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
 *  or alternatively, you might use OpenHaptics provided by Sensable.
 */

#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/phantom.h>

#include <asm/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 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 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_COMPAT
static 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);

	nonseekable_open(inode, file);

	if (mutex_lock_interruptible(&dev->open_lock))
		return -ERESTARTSYS;

	if (dev->opened) {
		mutex_unlock(&dev->open_lock);
		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);

	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 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 (!(dev->status & PHB_RUNNING))
		mask = POLLERR;
	else if (atomic_read(&dev->counter))
		mask = POLLIN | POLLRDNORM;

	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,
	.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 __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->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 | 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_PM
static 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 */

	synchronize_irq(pdev->irq);

	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 = {
	{ .vendor = PCI_VENDOR_ID_PLX, .device = PCI_DEVICE_ID_PLX_9050,
	  .subvendor = PCI_VENDOR_ID_PLX, .subdevice = 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 <[email protected]>");
MODULE_DESCRIPTION("Sensable Phantom driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(PHANTOM_VERSION);
Commit	Line	Data
cef2cf07 JS	1	/*
	2	* Copyright (C) 2005-2007 Jiri Slaby <[email protected]>
	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
b2afe331	12	* or alternatively, you might use OpenHaptics provided by Sensable.
cef2cf07 JS	13	*/
cef2cf07 JS	14
7e4e8e68	15	#include <linux/compat.h>
cef2cf07 JS	16	#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>
	25
	26	#include <asm/atomic.h>
	27	#include <asm/io.h>
	28
82f56087	29	#define PHANTOM_VERSION "n0.9.8"
cef2cf07 JS	30
	31	#define PHANTOM_MAX_MINORS 8
	32
	33	#define PHN_IRQCTL 0x4c /* irq control in caddr space */
	34
	35	#define PHB_RUNNING 1
bc552f77	36	#define PHB_NOT_OH 2
cef2cf07 JS	37
	38	static struct class *phantom_class;
	39	static int phantom_major;
	40
	41	struct phantom_device {
	42	unsigned int opened;
	43	void __iomem *caddr;
	44	u32 __iomem *iaddr;
	45	u32 __iomem *oaddr;
	46	unsigned long status;
	47	atomic_t counter;
	48
	49	wait_queue_head_t wait;
	50	struct cdev cdev;
	51
	52	struct mutex open_lock;
bc552f77 JS	53	spinlock_t regs_lock;
	54
	55	/* used in NOT_OH mode */
	56	struct phm_regs oregs;
	57	u32 ctl_reg;
cef2cf07 JS	58	};
	59
	60	static unsigned char phantom_devices[PHANTOM_MAX_MINORS];
	61
	62	static int phantom_status(struct phantom_device *dev, unsigned long newstat)
	63	{
	64	pr_debug("phantom_status %lx %lx\n", dev->status, newstat);
	65
	66	if (!(dev->status & PHB_RUNNING) && (newstat & PHB_RUNNING)) {
	67	atomic_set(&dev->counter, 0);
	68	iowrite32(PHN_CTL_IRQ, dev->iaddr + PHN_CONTROL);
	69	iowrite32(0x43, dev->caddr + PHN_IRQCTL);
c8511f94 JS	70	ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
c8511f94 JS	71	} else if ((dev->status & PHB_RUNNING) && !(newstat & PHB_RUNNING)) {
cef2cf07	72	iowrite32(0, dev->caddr + PHN_IRQCTL);
c8511f94 JS	73	ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
c8511f94 JS	74	}
cef2cf07 JS	75
	76	dev->status = newstat;
	77
	78	return 0;
	79	}
	80
	81	/*
	82	* File ops
	83	*/
	84
c15395c0 JS	85	static long phantom_ioctl(struct file *file, unsigned int cmd,
c15395c0 JS	86	unsigned long arg)
cef2cf07 JS	87	{
	88	struct phantom_device *dev = file->private_data;
	89	struct phm_regs rs;
	90	struct phm_reg r;
	91	void __user argp = (void __user )arg;
bc552f77	92	unsigned long flags;
cef2cf07 JS	93	unsigned int i;
cef2cf07 JS	94
cef2cf07	95	switch (cmd) {
7e4e8e68	96	case PHN_SETREG:
cef2cf07 JS	97	case PHN_SET_REG:
	98	if (copy_from_user(&r, argp, sizeof(r)))
	99	return -EFAULT;
	100
	101	if (r.reg > 7)
	102	return -EINVAL;
	103
bc552f77	104	spin_lock_irqsave(&dev->regs_lock, flags);
cef2cf07	105	if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) &&
c15395c0	106	phantom_status(dev, dev->status \| PHB_RUNNING)){
bc552f77	107	spin_unlock_irqrestore(&dev->regs_lock, flags);
cef2cf07	108	return -ENODEV;
c15395c0	109	}
cef2cf07 JS	110
cef2cf07 JS	111	pr_debug("phantom: writing %x to %u\n", r.value, r.reg);
bc552f77 JS	112
	113	/* preserve amp bit (don't allow to change it when in NOT_OH) */
	114	if (r.reg == PHN_CONTROL && (dev->status & PHB_NOT_OH)) {
	115	r.value &= ~PHN_CTL_AMP;
	116	r.value \|= dev->ctl_reg & PHN_CTL_AMP;
	117	dev->ctl_reg = r.value;
	118	}
	119
cef2cf07	120	iowrite32(r.value, dev->iaddr + r.reg);
c8511f94	121	ioread32(dev->iaddr); /* PCI posting */
cef2cf07 JS	122
	123	if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ))
	124	phantom_status(dev, dev->status & ~PHB_RUNNING);
bc552f77	125	spin_unlock_irqrestore(&dev->regs_lock, flags);
cef2cf07	126	break;
7e4e8e68	127	case PHN_SETREGS:
cef2cf07 JS	128	case PHN_SET_REGS:
	129	if (copy_from_user(&rs, argp, sizeof(rs)))
	130	return -EFAULT;
	131
	132	pr_debug("phantom: SRS %u regs %x\n", rs.count, rs.mask);
bc552f77 JS	133	spin_lock_irqsave(&dev->regs_lock, flags);
	134	if (dev->status & PHB_NOT_OH)
	135	memcpy(&dev->oregs, &rs, sizeof(rs));
	136	else {
	137	u32 m = min(rs.count, 8U);
	138	for (i = 0; i < m; i++)
	139	if (rs.mask & BIT(i))
	140	iowrite32(rs.values[i], dev->oaddr + i);
	141	ioread32(dev->iaddr); /* PCI posting */
	142	}
	143	spin_unlock_irqrestore(&dev->regs_lock, flags);
cef2cf07	144	break;
7e4e8e68	145	case PHN_GETREG:
cef2cf07 JS	146	case PHN_GET_REG:
	147	if (copy_from_user(&r, argp, sizeof(r)))
	148	return -EFAULT;
	149
	150	if (r.reg > 7)
	151	return -EINVAL;
	152
	153	r.value = ioread32(dev->iaddr + r.reg);
	154
	155	if (copy_to_user(argp, &r, sizeof(r)))
	156	return -EFAULT;
	157	break;
7e4e8e68	158	case PHN_GETREGS:
bc552f77 JS	159	case PHN_GET_REGS: {
	160	u32 m;
	161
cef2cf07 JS	162	if (copy_from_user(&rs, argp, sizeof(rs)))
	163	return -EFAULT;
	164
bc552f77 JS	165	m = min(rs.count, 8U);
bc552f77 JS	166
cef2cf07	167	pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask);
bc552f77 JS	168	spin_lock_irqsave(&dev->regs_lock, flags);
	169	for (i = 0; i < m; i++)
	170	if (rs.mask & BIT(i))
cef2cf07	171	rs.values[i] = ioread32(dev->iaddr + i);
7d4f9f09	172	atomic_set(&dev->counter, 0);
bc552f77	173	spin_unlock_irqrestore(&dev->regs_lock, flags);
cef2cf07 JS	174
	175	if (copy_to_user(argp, &rs, sizeof(rs)))
	176	return -EFAULT;
	177	break;
bc552f77 JS	178	} case PHN_NOT_OH:
	179	spin_lock_irqsave(&dev->regs_lock, flags);
	180	if (dev->status & PHB_RUNNING) {
	181	printk(KERN_ERR "phantom: you need to set NOT_OH "
	182	"before you start the device!\n");
	183	spin_unlock_irqrestore(&dev->regs_lock, flags);
	184	return -EINVAL;
	185	}
	186	dev->status \|= PHB_NOT_OH;
	187	spin_unlock_irqrestore(&dev->regs_lock, flags);
	188	break;
cef2cf07 JS	189	default:
	190	return -ENOTTY;
	191	}
	192
	193	return 0;
	194	}
	195
7e4e8e68 JS	196	#ifdef CONFIG_COMPAT
	197	static long phantom_compat_ioctl(struct file *filp, unsigned int cmd,
	198	unsigned long arg)
	199	{
	200	if (_IOC_NR(cmd) <= 3 && _IOC_SIZE(cmd) == sizeof(compat_uptr_t)) {
	201	cmd &= ~(_IOC_SIZEMASK << _IOC_SIZESHIFT);
	202	cmd \|= sizeof(void *) << _IOC_SIZESHIFT;
	203	}
	204	return phantom_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
	205	}
	206	#else
	207	#define phantom_compat_ioctl NULL
	208	#endif
	209
cef2cf07 JS	210	static int phantom_open(struct inode inode, struct file file)
	211	{
	212	struct phantom_device *dev = container_of(inode->i_cdev,
	213	struct phantom_device, cdev);
	214
	215	nonseekable_open(inode, file);
	216
	217	if (mutex_lock_interruptible(&dev->open_lock))
	218	return -ERESTARTSYS;
	219
	220	if (dev->opened) {
	221	mutex_unlock(&dev->open_lock);
	222	return -EINVAL;
	223	}
	224
bc552f77 JS	225	WARN_ON(dev->status & PHB_NOT_OH);
bc552f77 JS	226
cef2cf07 JS	227	file->private_data = dev;
cef2cf07 JS	228
bc552f77	229	atomic_set(&dev->counter, 0);
cef2cf07 JS	230	dev->opened++;
	231	mutex_unlock(&dev->open_lock);
	232
	233	return 0;
	234	}
	235
	236	static int phantom_release(struct inode inode, struct file file)
	237	{
	238	struct phantom_device *dev = file->private_data;
	239
	240	mutex_lock(&dev->open_lock);
	241
	242	dev->opened = 0;
	243	phantom_status(dev, dev->status & ~PHB_RUNNING);
bc552f77	244	dev->status &= ~PHB_NOT_OH;
cef2cf07 JS	245
	246	mutex_unlock(&dev->open_lock);
	247
	248	return 0;
	249	}
	250
	251	static unsigned int phantom_poll(struct file file, poll_table wait)
	252	{
	253	struct phantom_device *dev = file->private_data;
	254	unsigned int mask = 0;
	255
	256	pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));
	257	poll_wait(file, &dev->wait, wait);
7d4f9f09 JS	258
	259	if (!(dev->status & PHB_RUNNING))
	260	mask = POLLERR;
	261	else if (atomic_read(&dev->counter))
cef2cf07	262	mask = POLLIN \| POLLRDNORM;
7d4f9f09	263
cef2cf07 JS	264	pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));
	265
	266	return mask;
	267	}
	268
	269	static struct file_operations phantom_file_ops = {
	270	.open = phantom_open,
	271	.release = phantom_release,
c15395c0	272	.unlocked_ioctl = phantom_ioctl,
7e4e8e68	273	.compat_ioctl = phantom_compat_ioctl,
cef2cf07 JS	274	.poll = phantom_poll,
	275	};
	276
	277	static irqreturn_t phantom_isr(int irq, void *data)
	278	{
	279	struct phantom_device *dev = data;
bc552f77 JS	280	unsigned int i;
bc552f77 JS	281	u32 ctl;
cef2cf07	282
bc552f77 JS	283	spin_lock(&dev->regs_lock);
	284	ctl = ioread32(dev->iaddr + PHN_CONTROL);
	285	if (!(ctl & PHN_CTL_IRQ)) {
	286	spin_unlock(&dev->regs_lock);
cef2cf07	287	return IRQ_NONE;
bc552f77	288	}
cef2cf07 JS	289
	290	iowrite32(0, dev->iaddr);
	291	iowrite32(0xc0, dev->iaddr);
bc552f77 JS	292
	293	if (dev->status & PHB_NOT_OH) {
	294	struct phm_regs *r = &dev->oregs;
	295	u32 m = min(r->count, 8U);
	296
	297	for (i = 0; i < m; i++)
	298	if (r->mask & BIT(i))
	299	iowrite32(r->values[i], dev->oaddr + i);
	300
	301	dev->ctl_reg ^= PHN_CTL_AMP;
	302	iowrite32(dev->ctl_reg, dev->iaddr + PHN_CONTROL);
	303	}
	304	spin_unlock(&dev->regs_lock);
	305
c8511f94	306	ioread32(dev->iaddr); /* PCI posting */
cef2cf07 JS	307
	308	atomic_inc(&dev->counter);
	309	wake_up_interruptible(&dev->wait);
	310
	311	return IRQ_HANDLED;
	312	}
	313
	314	/*
	315	* Init and deinit driver
	316	*/
	317
	318	static unsigned int __devinit phantom_get_free(void)
	319	{
	320	unsigned int i;
	321
	322	for (i = 0; i < PHANTOM_MAX_MINORS; i++)
	323	if (phantom_devices[i] == 0)
	324	break;
	325
	326	return i;
	327	}
	328
	329	static int __devinit phantom_probe(struct pci_dev *pdev,
	330	const struct pci_device_id *pci_id)
	331	{
	332	struct phantom_device *pht;
	333	unsigned int minor;
	334	int retval;
	335
	336	retval = pci_enable_device(pdev);
	337	if (retval)
	338	goto err;
	339
	340	minor = phantom_get_free();
	341	if (minor == PHANTOM_MAX_MINORS) {
	342	dev_err(&pdev->dev, "too many devices found!\n");
	343	retval = -EIO;
	344	goto err_dis;
	345	}
	346
	347	phantom_devices[minor] = 1;
	348
	349	retval = pci_request_regions(pdev, "phantom");
	350	if (retval)
	351	goto err_null;
	352
	353	retval = -ENOMEM;
	354	pht = kzalloc(sizeof(*pht), GFP_KERNEL);
	355	if (pht == NULL) {
	356	dev_err(&pdev->dev, "unable to allocate device\n");
	357	goto err_reg;
	358	}
	359
	360	pht->caddr = pci_iomap(pdev, 0, 0);
	361	if (pht->caddr == NULL) {
	362	dev_err(&pdev->dev, "can't remap conf space\n");
	363	goto err_fr;
	364	}
	365	pht->iaddr = pci_iomap(pdev, 2, 0);
	366	if (pht->iaddr == NULL) {
	367	dev_err(&pdev->dev, "can't remap input space\n");
	368	goto err_unmc;
	369	}
	370	pht->oaddr = pci_iomap(pdev, 3, 0);
371	if (pht->oaddr == NULL) {
372	dev_err(&pdev->dev, "can't remap output space\n");
373	goto err_unmi;
374	}
375
376	mutex_init(&pht->open_lock);
bc552f77	377	spin_lock_init(&pht->regs_lock);
cef2cf07 JS	378	init_waitqueue_head(&pht->wait);
	379	cdev_init(&pht->cdev, &phantom_file_ops);
	380	pht->cdev.owner = THIS_MODULE;
	381
	382	iowrite32(0, pht->caddr + PHN_IRQCTL);
c8511f94	383	ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
cef2cf07 JS	384	retval = request_irq(pdev->irq, phantom_isr,
	385	IRQF_SHARED \| IRQF_DISABLED, "phantom", pht);
	386	if (retval) {
	387	dev_err(&pdev->dev, "can't establish ISR\n");
	388	goto err_unmo;
	389	}
	390
	391	retval = cdev_add(&pht->cdev, MKDEV(phantom_major, minor), 1);
	392	if (retval) {
	393	dev_err(&pdev->dev, "chardev registration failed\n");
	394	goto err_irq;
	395	}
	396
	397	if (IS_ERR(device_create(phantom_class, &pdev->dev, MKDEV(phantom_major,
	398	minor), "phantom%u", minor)))
	399	dev_err(&pdev->dev, "can't create device\n");
	400
	401	pci_set_drvdata(pdev, pht);
	402
	403	return 0;
	404	err_irq:
	405	free_irq(pdev->irq, pht);
	406	err_unmo:
	407	pci_iounmap(pdev, pht->oaddr);
	408	err_unmi:
	409	pci_iounmap(pdev, pht->iaddr);
	410	err_unmc:
	411	pci_iounmap(pdev, pht->caddr);
	412	err_fr:
	413	kfree(pht);
	414	err_reg:
	415	pci_release_regions(pdev);
	416	err_null:
	417	phantom_devices[minor] = 0;
	418	err_dis:
	419	pci_disable_device(pdev);
	420	err:
	421	return retval;
	422	}
	423
	424	static void __devexit phantom_remove(struct pci_dev *pdev)
	425	{
	426	struct phantom_device *pht = pci_get_drvdata(pdev);
	427	unsigned int minor = MINOR(pht->cdev.dev);
	428
	429	device_destroy(phantom_class, MKDEV(phantom_major, minor));
	430
	431	cdev_del(&pht->cdev);
	432
	433	iowrite32(0, pht->caddr + PHN_IRQCTL);
c8511f94	434	ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
cef2cf07 JS	435	free_irq(pdev->irq, pht);
	436
	437	pci_iounmap(pdev, pht->oaddr);
	438	pci_iounmap(pdev, pht->iaddr);
	439	pci_iounmap(pdev, pht->caddr);
	440
	441	kfree(pht);
	442
	443	pci_release_regions(pdev);
	444
	445	phantom_devices[minor] = 0;
	446
	447	pci_disable_device(pdev);
	448	}
	449
	450	#ifdef CONFIG_PM
	451	static int phantom_suspend(struct pci_dev *pdev, pm_message_t state)
	452	{
	453	struct phantom_device *dev = pci_get_drvdata(pdev);
	454
	455	iowrite32(0, dev->caddr + PHN_IRQCTL);
c8511f94	456	ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
cef2cf07	457
aee8447c JS	458	synchronize_irq(pdev->irq);
aee8447c JS	459
cef2cf07 JS	460	return 0;
	461	}
	462
	463	static int phantom_resume(struct pci_dev *pdev)
	464	{
	465	struct phantom_device *dev = pci_get_drvdata(pdev);
	466
	467	iowrite32(0, dev->caddr + PHN_IRQCTL);
	468
	469	return 0;
	470	}
	471	#else
	472	#define phantom_suspend NULL
	473	#define phantom_resume NULL
	474	#endif
	475
	476	static struct pci_device_id phantom_pci_tbl[] __devinitdata = {
82f56087 JS	477	{ .vendor = PCI_VENDOR_ID_PLX, .device = PCI_DEVICE_ID_PLX_9050,
	478	.subvendor = PCI_VENDOR_ID_PLX, .subdevice = PCI_DEVICE_ID_PLX_9050,
	479	.class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 },
cef2cf07 JS	480	{ 0, }
	481	};
	482	MODULE_DEVICE_TABLE(pci, phantom_pci_tbl);
	483
	484	static struct pci_driver phantom_pci_driver = {
	485	.name = "phantom",
	486	.id_table = phantom_pci_tbl,
	487	.probe = phantom_probe,
	488	.remove = __devexit_p(phantom_remove),
	489	.suspend = phantom_suspend,
	490	.resume = phantom_resume
	491	};
	492
	493	static ssize_t phantom_show_version(struct class cls, char buf)
	494	{
	495	return sprintf(buf, PHANTOM_VERSION "\n");
	496	}
	497
	498	static CLASS_ATTR(version, 0444, phantom_show_version, NULL);
	499
	500	static int __init phantom_init(void)
	501	{
	502	int retval;
	503	dev_t dev;
	504
	505	phantom_class = class_create(THIS_MODULE, "phantom");
	506	if (IS_ERR(phantom_class)) {
	507	retval = PTR_ERR(phantom_class);
	508	printk(KERN_ERR "phantom: can't register phantom class\n");
	509	goto err;
	510	}
	511	retval = class_create_file(phantom_class, &class_attr_version);
	512	if (retval) {
	513	printk(KERN_ERR "phantom: can't create sysfs version file\n");
	514	goto err_class;
	515	}
	516
	517	retval = alloc_chrdev_region(&dev, 0, PHANTOM_MAX_MINORS, "phantom");
	518	if (retval) {
	519	printk(KERN_ERR "phantom: can't register character device\n");
	520	goto err_attr;
	521	}
	522	phantom_major = MAJOR(dev);
	523
	524	retval = pci_register_driver(&phantom_pci_driver);
	525	if (retval) {
	526	printk(KERN_ERR "phantom: can't register pci driver\n");
	527	goto err_unchr;
	528	}
	529
	530	printk(KERN_INFO "Phantom Linux Driver, version " PHANTOM_VERSION ", "
	531	"init OK\n");
	532
	533	return 0;
	534	err_unchr:
	535	unregister_chrdev_region(dev, PHANTOM_MAX_MINORS);
	536	err_attr:
	537	class_remove_file(phantom_class, &class_attr_version);
	538	err_class:
	539	class_destroy(phantom_class);
	540	err:
	541	return retval;
	542	}
	543
544	static void __exit phantom_exit(void)
545	{
546	pci_unregister_driver(&phantom_pci_driver);
547
548	unregister_chrdev_region(MKDEV(phantom_major, 0), PHANTOM_MAX_MINORS);
549
550	class_remove_file(phantom_class, &class_attr_version);
551	class_destroy(phantom_class);
552
553	pr_debug("phantom: module successfully removed\n");
554	}
555
556	module_init(phantom_init);
557	module_exit(phantom_exit);
558
559	MODULE_AUTHOR("Jiri Slaby <[email protected]>");
560	MODULE_DESCRIPTION("Sensable Phantom driver");
561	MODULE_LICENSE("GPL");
562	MODULE_VERSION(PHANTOM_VERSION);