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

/*
 *  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
 *  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);
		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 (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,
	.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 <jirislaby@gmail.com>");
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 <jirislaby@gmail.com>
	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);
bc552f77	172	spin_unlock_irqrestore(&dev->regs_lock, flags);
cef2cf07 JS	173
	174	if (copy_to_user(argp, &rs, sizeof(rs)))
	175	return -EFAULT;
	176	break;
bc552f77 JS	177	} case PHN_NOT_OH:
	178	spin_lock_irqsave(&dev->regs_lock, flags);
	179	if (dev->status & PHB_RUNNING) {
	180	printk(KERN_ERR "phantom: you need to set NOT_OH "
	181	"before you start the device!\n");
	182	spin_unlock_irqrestore(&dev->regs_lock, flags);
	183	return -EINVAL;
	184	}
	185	dev->status \|= PHB_NOT_OH;
	186	spin_unlock_irqrestore(&dev->regs_lock, flags);
	187	break;
cef2cf07 JS	188	default:
	189	return -ENOTTY;
	190	}
	191
	192	return 0;
	193	}
	194
7e4e8e68 JS	195	#ifdef CONFIG_COMPAT
	196	static long phantom_compat_ioctl(struct file *filp, unsigned int cmd,
	197	unsigned long arg)
	198	{
	199	if (_IOC_NR(cmd) <= 3 && _IOC_SIZE(cmd) == sizeof(compat_uptr_t)) {
	200	cmd &= ~(_IOC_SIZEMASK << _IOC_SIZESHIFT);
	201	cmd \|= sizeof(void *) << _IOC_SIZESHIFT;
	202	}
	203	return phantom_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
	204	}
	205	#else
	206	#define phantom_compat_ioctl NULL
	207	#endif
	208
cef2cf07 JS	209	static int phantom_open(struct inode inode, struct file file)
	210	{
	211	struct phantom_device *dev = container_of(inode->i_cdev,
	212	struct phantom_device, cdev);
	213
	214	nonseekable_open(inode, file);
	215
	216	if (mutex_lock_interruptible(&dev->open_lock))
	217	return -ERESTARTSYS;
	218
	219	if (dev->opened) {
	220	mutex_unlock(&dev->open_lock);
	221	return -EINVAL;
	222	}
	223
bc552f77 JS	224	WARN_ON(dev->status & PHB_NOT_OH);
bc552f77 JS	225
cef2cf07 JS	226	file->private_data = dev;
cef2cf07 JS	227
bc552f77	228	atomic_set(&dev->counter, 0);
cef2cf07 JS	229	dev->opened++;
	230	mutex_unlock(&dev->open_lock);
	231
	232	return 0;
	233	}
	234
	235	static int phantom_release(struct inode inode, struct file file)
	236	{
	237	struct phantom_device *dev = file->private_data;
	238
	239	mutex_lock(&dev->open_lock);
	240
	241	dev->opened = 0;
	242	phantom_status(dev, dev->status & ~PHB_RUNNING);
bc552f77	243	dev->status &= ~PHB_NOT_OH;
cef2cf07 JS	244
	245	mutex_unlock(&dev->open_lock);
	246
	247	return 0;
	248	}
	249
	250	static unsigned int phantom_poll(struct file file, poll_table wait)
	251	{
	252	struct phantom_device *dev = file->private_data;
	253	unsigned int mask = 0;
	254
	255	pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));
	256	poll_wait(file, &dev->wait, wait);
	257	if (atomic_read(&dev->counter)) {
	258	mask = POLLIN \| POLLRDNORM;
	259	atomic_dec(&dev->counter);
	260	} else if ((dev->status & PHB_RUNNING) == 0)
	261	mask = POLLIN \| POLLRDNORM \| POLLERR;
	262	pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));
	263
	264	return mask;
	265	}
	266
	267	static struct file_operations phantom_file_ops = {
	268	.open = phantom_open,
	269	.release = phantom_release,
c15395c0	270	.unlocked_ioctl = phantom_ioctl,
7e4e8e68	271	.compat_ioctl = phantom_compat_ioctl,
cef2cf07 JS	272	.poll = phantom_poll,
	273	};
	274
	275	static irqreturn_t phantom_isr(int irq, void *data)
	276	{
	277	struct phantom_device *dev = data;
bc552f77 JS	278	unsigned int i;
bc552f77 JS	279	u32 ctl;
cef2cf07	280
bc552f77 JS	281	spin_lock(&dev->regs_lock);
	282	ctl = ioread32(dev->iaddr + PHN_CONTROL);
	283	if (!(ctl & PHN_CTL_IRQ)) {
	284	spin_unlock(&dev->regs_lock);
cef2cf07	285	return IRQ_NONE;
bc552f77	286	}
cef2cf07 JS	287
	288	iowrite32(0, dev->iaddr);
	289	iowrite32(0xc0, dev->iaddr);
bc552f77 JS	290
	291	if (dev->status & PHB_NOT_OH) {
	292	struct phm_regs *r = &dev->oregs;
	293	u32 m = min(r->count, 8U);
	294
	295	for (i = 0; i < m; i++)
	296	if (r->mask & BIT(i))
	297	iowrite32(r->values[i], dev->oaddr + i);
	298
	299	dev->ctl_reg ^= PHN_CTL_AMP;
	300	iowrite32(dev->ctl_reg, dev->iaddr + PHN_CONTROL);
	301	}
	302	spin_unlock(&dev->regs_lock);
	303
c8511f94	304	ioread32(dev->iaddr); /* PCI posting */
cef2cf07 JS	305
	306	atomic_inc(&dev->counter);
	307	wake_up_interruptible(&dev->wait);
	308
	309	return IRQ_HANDLED;
	310	}
	311
	312	/*
	313	* Init and deinit driver
	314	*/
	315
	316	static unsigned int __devinit phantom_get_free(void)
	317	{
	318	unsigned int i;
	319
	320	for (i = 0; i < PHANTOM_MAX_MINORS; i++)
	321	if (phantom_devices[i] == 0)
	322	break;
	323
	324	return i;
	325	}
	326
	327	static int __devinit phantom_probe(struct pci_dev *pdev,
	328	const struct pci_device_id *pci_id)
	329	{
	330	struct phantom_device *pht;
	331	unsigned int minor;
	332	int retval;
	333
	334	retval = pci_enable_device(pdev);
	335	if (retval)
	336	goto err;
	337
	338	minor = phantom_get_free();
	339	if (minor == PHANTOM_MAX_MINORS) {
	340	dev_err(&pdev->dev, "too many devices found!\n");
	341	retval = -EIO;
	342	goto err_dis;
	343	}
	344
	345	phantom_devices[minor] = 1;
	346
	347	retval = pci_request_regions(pdev, "phantom");
	348	if (retval)
	349	goto err_null;
	350
	351	retval = -ENOMEM;
	352	pht = kzalloc(sizeof(*pht), GFP_KERNEL);
	353	if (pht == NULL) {
	354	dev_err(&pdev->dev, "unable to allocate device\n");
	355	goto err_reg;
	356	}
	357
	358	pht->caddr = pci_iomap(pdev, 0, 0);
	359	if (pht->caddr == NULL) {
	360	dev_err(&pdev->dev, "can't remap conf space\n");
	361	goto err_fr;
	362	}
	363	pht->iaddr = pci_iomap(pdev, 2, 0);
	364	if (pht->iaddr == NULL) {
	365	dev_err(&pdev->dev, "can't remap input space\n");
	366	goto err_unmc;
	367	}
	368	pht->oaddr = pci_iomap(pdev, 3, 0);
369	if (pht->oaddr == NULL) {
370	dev_err(&pdev->dev, "can't remap output space\n");
371	goto err_unmi;
372	}
373
374	mutex_init(&pht->open_lock);
bc552f77	375	spin_lock_init(&pht->regs_lock);
cef2cf07 JS	376	init_waitqueue_head(&pht->wait);
	377	cdev_init(&pht->cdev, &phantom_file_ops);
	378	pht->cdev.owner = THIS_MODULE;
	379
	380	iowrite32(0, pht->caddr + PHN_IRQCTL);
c8511f94	381	ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
cef2cf07 JS	382	retval = request_irq(pdev->irq, phantom_isr,
	383	IRQF_SHARED \| IRQF_DISABLED, "phantom", pht);
	384	if (retval) {
	385	dev_err(&pdev->dev, "can't establish ISR\n");
	386	goto err_unmo;
	387	}
	388
	389	retval = cdev_add(&pht->cdev, MKDEV(phantom_major, minor), 1);
	390	if (retval) {
	391	dev_err(&pdev->dev, "chardev registration failed\n");
	392	goto err_irq;
	393	}
	394
	395	if (IS_ERR(device_create(phantom_class, &pdev->dev, MKDEV(phantom_major,
	396	minor), "phantom%u", minor)))
	397	dev_err(&pdev->dev, "can't create device\n");
	398
	399	pci_set_drvdata(pdev, pht);
	400
	401	return 0;
	402	err_irq:
	403	free_irq(pdev->irq, pht);
	404	err_unmo:
	405	pci_iounmap(pdev, pht->oaddr);
	406	err_unmi:
	407	pci_iounmap(pdev, pht->iaddr);
	408	err_unmc:
	409	pci_iounmap(pdev, pht->caddr);
	410	err_fr:
	411	kfree(pht);
	412	err_reg:
	413	pci_release_regions(pdev);
	414	err_null:
	415	phantom_devices[minor] = 0;
	416	err_dis:
	417	pci_disable_device(pdev);
	418	err:
	419	return retval;
	420	}
	421
	422	static void __devexit phantom_remove(struct pci_dev *pdev)
	423	{
	424	struct phantom_device *pht = pci_get_drvdata(pdev);
	425	unsigned int minor = MINOR(pht->cdev.dev);
	426
	427	device_destroy(phantom_class, MKDEV(phantom_major, minor));
	428
	429	cdev_del(&pht->cdev);
	430
	431	iowrite32(0, pht->caddr + PHN_IRQCTL);
c8511f94	432	ioread32(pht->caddr + PHN_IRQCTL); /* PCI posting */
cef2cf07 JS	433	free_irq(pdev->irq, pht);
	434
	435	pci_iounmap(pdev, pht->oaddr);
	436	pci_iounmap(pdev, pht->iaddr);
	437	pci_iounmap(pdev, pht->caddr);
	438
	439	kfree(pht);
	440
	441	pci_release_regions(pdev);
	442
	443	phantom_devices[minor] = 0;
	444
	445	pci_disable_device(pdev);
	446	}
	447
	448	#ifdef CONFIG_PM
	449	static int phantom_suspend(struct pci_dev *pdev, pm_message_t state)
	450	{
	451	struct phantom_device *dev = pci_get_drvdata(pdev);
	452
	453	iowrite32(0, dev->caddr + PHN_IRQCTL);
c8511f94	454	ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
cef2cf07	455
aee8447c JS	456	synchronize_irq(pdev->irq);
aee8447c JS	457
cef2cf07 JS	458	return 0;
	459	}
	460
	461	static int phantom_resume(struct pci_dev *pdev)
	462	{
	463	struct phantom_device *dev = pci_get_drvdata(pdev);
	464
	465	iowrite32(0, dev->caddr + PHN_IRQCTL);
	466
	467	return 0;
	468	}
	469	#else
	470	#define phantom_suspend NULL
	471	#define phantom_resume NULL
	472	#endif
	473
	474	static struct pci_device_id phantom_pci_tbl[] __devinitdata = {
82f56087 JS	475	{ .vendor = PCI_VENDOR_ID_PLX, .device = PCI_DEVICE_ID_PLX_9050,
	476	.subvendor = PCI_VENDOR_ID_PLX, .subdevice = PCI_DEVICE_ID_PLX_9050,
	477	.class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 },
cef2cf07 JS	478	{ 0, }
	479	};
	480	MODULE_DEVICE_TABLE(pci, phantom_pci_tbl);
	481
	482	static struct pci_driver phantom_pci_driver = {
	483	.name = "phantom",
	484	.id_table = phantom_pci_tbl,
	485	.probe = phantom_probe,
	486	.remove = __devexit_p(phantom_remove),
	487	.suspend = phantom_suspend,
	488	.resume = phantom_resume
	489	};
	490
	491	static ssize_t phantom_show_version(struct class cls, char buf)
	492	{
	493	return sprintf(buf, PHANTOM_VERSION "\n");
	494	}
	495
	496	static CLASS_ATTR(version, 0444, phantom_show_version, NULL);
	497
	498	static int __init phantom_init(void)
	499	{
	500	int retval;
	501	dev_t dev;
	502
	503	phantom_class = class_create(THIS_MODULE, "phantom");
	504	if (IS_ERR(phantom_class)) {
	505	retval = PTR_ERR(phantom_class);
	506	printk(KERN_ERR "phantom: can't register phantom class\n");
	507	goto err;
	508	}
	509	retval = class_create_file(phantom_class, &class_attr_version);
	510	if (retval) {
	511	printk(KERN_ERR "phantom: can't create sysfs version file\n");
	512	goto err_class;
	513	}
	514
	515	retval = alloc_chrdev_region(&dev, 0, PHANTOM_MAX_MINORS, "phantom");
	516	if (retval) {
	517	printk(KERN_ERR "phantom: can't register character device\n");
	518	goto err_attr;
	519	}
	520	phantom_major = MAJOR(dev);
	521
	522	retval = pci_register_driver(&phantom_pci_driver);
	523	if (retval) {
	524	printk(KERN_ERR "phantom: can't register pci driver\n");
	525	goto err_unchr;
	526	}
	527
	528	printk(KERN_INFO "Phantom Linux Driver, version " PHANTOM_VERSION ", "
	529	"init OK\n");
	530
	531	return 0;
	532	err_unchr:
	533	unregister_chrdev_region(dev, PHANTOM_MAX_MINORS);
	534	err_attr:
	535	class_remove_file(phantom_class, &class_attr_version);
	536	err_class:
	537	class_destroy(phantom_class);
	538	err:
	539	return retval;
	540	}
	541
542	static void __exit phantom_exit(void)
543	{
544	pci_unregister_driver(&phantom_pci_driver);
545
546	unregister_chrdev_region(MKDEV(phantom_major, 0), PHANTOM_MAX_MINORS);
547
548	class_remove_file(phantom_class, &class_attr_version);
549	class_destroy(phantom_class);
550
551	pr_debug("phantom: module successfully removed\n");
552	}
553
554	module_init(phantom_init);
555	module_exit(phantom_exit);
556
557	MODULE_AUTHOR("Jiri Slaby <jirislaby@gmail.com>");
558	MODULE_DESCRIPTION("Sensable Phantom driver");
559	MODULE_LICENSE("GPL");
560	MODULE_VERSION(PHANTOM_VERSION);