Misc: add sensable phantom driver

Add sensable phantom driver

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 463 insertions, 0 deletions

diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c
new file mode 100644
index 000000000000..35b139b0e5f2
--- /dev/null
+++ b/drivers/misc/phantom.c
@@ -0,0 +1,463 @@
+/*
+ *  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;
+};
+
+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);
+        } else if ((dev->status & PHB_RUNNING) && !(newstat & PHB_RUNNING))
+                iowrite32(0, dev->caddr + PHN_IRQCTL);
+
+        dev->status = newstat;
+
+        return 0;
+}
+
+/*
+ * File ops
+ */
+
+static int phantom_ioctl(struct inode *inode, struct file *file, u_int cmd,
+        u_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;
+
+                if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) &&
+                                phantom_status(dev, dev->status | PHB_RUNNING))
+                        return -ENODEV;
+
+                pr_debug("phantom: writing %x to %u\n", r.value, r.reg);
+                iowrite32(r.value, dev->iaddr + r.reg);
+
+                if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ))
+                        phantom_status(dev, dev->status & ~PHB_RUNNING);
+                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);
+                for (i = 0; i < min(rs.count, 8U); i++)
+                        if ((1 << i) & rs.mask)
+                                iowrite32(rs.values[i], dev->oaddr + i);
+                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);
+                for (i = 0; i < min(rs.count, 8U); i++)
+                        if ((1 << i) & rs.mask)
+                                rs.values[i] = ioread32(dev->iaddr + i);
+
+                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,
+        .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);
+
+        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);
+        init_waitqueue_head(&pht->wait);
+        cdev_init(&pht->cdev, &phantom_file_ops);
+        pht->cdev.owner = THIS_MODULE;
+
+        iowrite32(0, pht->caddr + PHN_IRQCTL);
+        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);
+        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);
+
+        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);