1 files changed, 428 insertions, 0 deletions

diff --git a/drivers/hid/hid-roccat.c b/drivers/hid/hid-roccat.c
new file mode 100644
index 00000000000..e05d48edb66
--- /dev/null
+++ b/drivers/hid/hid-roccat.c
@@ -0,0 +1,428 @@
+/*
+ * Roccat driver for Linux
+ *
+ * Copyright (c) 2010 Stefan Achatz <erazor_de@users.sourceforge.net>
+ */
+
+/*
+ * 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.
+ */
+
+/*
+ * Module roccat is a char device used to report special events of roccat
+ * hardware to userland. These events include requests for on-screen-display of
+ * profile or dpi settings or requests for execution of macro sequences that are
+ * not stored in device. The information in these events depends on hid device
+ * implementation and contains data that is not available in a single hid event
+ * or else hidraw could have been used.
+ * It is inspired by hidraw, but uses only one circular buffer for all readers.
+ */
+
+#include <linux/cdev.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+
+#include "hid-roccat.h"
+
+#define ROCCAT_FIRST_MINOR 0
+#define ROCCAT_MAX_DEVICES 8
+
+/* should be a power of 2 for performance reason */
+#define ROCCAT_CBUF_SIZE 16
+
+struct roccat_report {
+        uint8_t *value;
+        int len;
+};
+
+struct roccat_device {
+        unsigned int minor;
+        int open;
+        int exist;
+        wait_queue_head_t wait;
+        struct device *dev;
+        struct hid_device *hid;
+        struct list_head readers;
+        /* protects modifications of readers list */
+        struct mutex readers_lock;
+
+        /*
+         * circular_buffer has one writer and multiple readers with their own
+         * read pointers
+         */
+        struct roccat_report cbuf[ROCCAT_CBUF_SIZE];
+        int cbuf_end;
+        struct mutex cbuf_lock;
+};
+
+struct roccat_reader {
+        struct list_head node;
+        struct roccat_device *device;
+        int cbuf_start;
+};
+
+static int roccat_major;
+static struct class *roccat_class;
+static struct cdev roccat_cdev;
+
+static struct roccat_device *devices[ROCCAT_MAX_DEVICES];
+/* protects modifications of devices array */
+static DEFINE_MUTEX(devices_lock);
+
+static ssize_t roccat_read(struct file *file, char __user *buffer,
+                size_t count, loff_t *ppos)
+{
+        struct roccat_reader *reader = file->private_data;
+        struct roccat_device *device = reader->device;
+        struct roccat_report *report;
+        ssize_t retval = 0, len;
+        DECLARE_WAITQUEUE(wait, current);
+
+        mutex_lock(&device->cbuf_lock);
+
+        /* no data? */
+        if (reader->cbuf_start == device->cbuf_end) {
+                add_wait_queue(&device->wait, &wait);
+                set_current_state(TASK_INTERRUPTIBLE);
+
+                /* wait for data */
+                while (reader->cbuf_start == device->cbuf_end) {
+                        if (file->f_flags & O_NONBLOCK) {
+                                retval = -EAGAIN;
+                                break;
+                        }
+                        if (signal_pending(current)) {
+                                retval = -ERESTARTSYS;
+                                break;
+                        }
+                        if (!device->exist) {
+                                retval = -EIO;
+                                break;
+                        }
+
+                        mutex_unlock(&device->cbuf_lock);
+                        schedule();
+                        mutex_lock(&device->cbuf_lock);
+                        set_current_state(TASK_INTERRUPTIBLE);
+                }
+
+                set_current_state(TASK_RUNNING);
+                remove_wait_queue(&device->wait, &wait);
+        }
+
+        /* here we either have data or a reason to return if retval is set */
+        if (retval)
+                goto exit_unlock;
+
+        report = &device->cbuf[reader->cbuf_start];
+        /*
+         * If report is larger than requested amount of data, rest of report
+         * is lost!
+         */
+        len = report->len > count ? count : report->len;
+
+        if (copy_to_user(buffer, report->value, len)) {
+                retval = -EFAULT;
+                goto exit_unlock;
+        }
+        retval += len;
+        reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
+
+exit_unlock:
+        mutex_unlock(&device->cbuf_lock);
+        return retval;
+}
+
+static unsigned int roccat_poll(struct file *file, poll_table *wait)
+{
+        struct roccat_reader *reader = file->private_data;
+        poll_wait(file, &reader->device->wait, wait);
+        if (reader->cbuf_start != reader->device->cbuf_end)
+                return POLLIN | POLLRDNORM;
+        if (!reader->device->exist)
+                return POLLERR | POLLHUP;
+        return 0;
+}
+
+static int roccat_open(struct inode *inode, struct file *file)
+{
+        unsigned int minor = iminor(inode);
+        struct roccat_reader *reader;
+        struct roccat_device *device;
+        int error = 0;
+
+        reader = kzalloc(sizeof(struct roccat_reader), GFP_KERNEL);
+        if (!reader)
+                return -ENOMEM;
+
+        mutex_lock(&devices_lock);
+
+        device = devices[minor];
+
+        mutex_lock(&device->readers_lock);
+
+        if (!device) {
+                printk(KERN_EMERG "roccat device with minor %d doesn't exist\n",
+                                minor);
+                error = -ENODEV;
+                goto exit_unlock;
+        }
+
+        if (!device->open++) {
+                /* power on device on adding first reader */
+                if (device->hid->ll_driver->power) {
+                        error = device->hid->ll_driver->power(device->hid,
+                                        PM_HINT_FULLON);
+                        if (error < 0) {
+                                --device->open;
+                                goto exit_unlock;
+                        }
+                }
+                error = device->hid->ll_driver->open(device->hid);
+                if (error < 0) {
+                        if (device->hid->ll_driver->power)
+                                device->hid->ll_driver->power(device->hid,
+                                                PM_HINT_NORMAL);
+                        --device->open;
+                        goto exit_unlock;
+                }
+        }
+
+        reader->device = device;
+        /* new reader doesn't get old events */
+        reader->cbuf_start = device->cbuf_end;
+
+        list_add_tail(&reader->node, &device->readers);
+        file->private_data = reader;
+
+exit_unlock:
+        mutex_unlock(&device->readers_lock);
+        mutex_unlock(&devices_lock);
+        return error;
+}
+
+static int roccat_release(struct inode *inode, struct file *file)
+{
+        unsigned int minor = iminor(inode);
+        struct roccat_reader *reader = file->private_data;
+        struct roccat_device *device;
+
+        mutex_lock(&devices_lock);
+
+        device = devices[minor];
+        if (!device) {
+                mutex_unlock(&devices_lock);
+                printk(KERN_EMERG "roccat device with minor %d doesn't exist\n",
+                                minor);
+                return -ENODEV;
+        }
+
+        mutex_lock(&device->readers_lock);
+        list_del(&reader->node);
+        mutex_unlock(&device->readers_lock);
+        kfree(reader);
+
+        if (!--device->open) {
+                /* removing last reader */
+                if (device->exist) {
+                        if (device->hid->ll_driver->power)
+                                device->hid->ll_driver->power(device->hid,
+                                                PM_HINT_NORMAL);
+                        device->hid->ll_driver->close(device->hid);
+                } else {
+                        kfree(device);
+                }
+        }
+
+        mutex_unlock(&devices_lock);
+
+        return 0;
+}
+
+/*
+ * roccat_report_event() - output data to readers
+ * @minor: minor device number returned by roccat_connect()
+ * @data: pointer to data
+ * @len: size of data
+ *
+ * Return value is zero on success, a negative error code on failure.
+ *
+ * This is called from interrupt handler.
+ */
+int roccat_report_event(int minor, u8 const *data, int len)
+{
+        struct roccat_device *device;
+        struct roccat_reader *reader;
+        struct roccat_report *report;
+        uint8_t *new_value;
+
+        new_value = kmemdup(data, len, GFP_ATOMIC);
+        if (!new_value)
+                return -ENOMEM;
+
+        device = devices[minor];
+
+        report = &device->cbuf[device->cbuf_end];
+
+        /* passing NULL is safe */
+        kfree(report->value);
+
+        report->value = new_value;
+        report->len = len;
+        device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;
+
+        list_for_each_entry(reader, &device->readers, node) {
+                /*
+                 * As we already inserted one element, the buffer can't be
+                 * empty. If start and end are equal, buffer is full and we
+                 * increase start, so that slow reader misses one event, but
+                 * gets the newer ones in the right order.
+                 */
+                if (reader->cbuf_start == device->cbuf_end)
+                        reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
+        }
+
+        wake_up_interruptible(&device->wait);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(roccat_report_event);
+
+/*
+ * roccat_connect() - create a char device for special event output
+ * @hid: the hid device the char device should be connected to.
+ *
+ * Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on
+ * success, a negative error code on failure.
+ */
+int roccat_connect(struct hid_device *hid)
+{
+        unsigned int minor;
+        struct roccat_device *device;
+        int temp;
+
+        device = kzalloc(sizeof(struct roccat_device), GFP_KERNEL);
+        if (!device)
+                return -ENOMEM;
+
+        mutex_lock(&devices_lock);
+
+        for (minor = 0; minor < ROCCAT_MAX_DEVICES; ++minor) {
+                if (devices[minor])
+                        continue;
+                break;
+        }
+
+        if (minor < ROCCAT_MAX_DEVICES) {
+                devices[minor] = device;
+        } else {
+                mutex_unlock(&devices_lock);
+                kfree(device);
+                return -EINVAL;
+        }
+
+        device->dev = device_create(roccat_class, &hid->dev,
+                        MKDEV(roccat_major, minor), NULL,
+                        "%s%s%d", "roccat", hid->driver->name, minor);
+
+        if (IS_ERR(device->dev)) {
+                devices[minor] = NULL;
+                mutex_unlock(&devices_lock);
+                temp = PTR_ERR(device->dev);
+                kfree(device);
+                return temp;
+        }
+
+        mutex_unlock(&devices_lock);
+
+        init_waitqueue_head(&device->wait);
+        INIT_LIST_HEAD(&device->readers);
+        mutex_init(&device->readers_lock);
+        mutex_init(&device->cbuf_lock);
+        device->minor = minor;
+        device->hid = hid;
+        device->exist = 1;
+        device->cbuf_end = 0;
+
+        return minor;
+}
+EXPORT_SYMBOL_GPL(roccat_connect);
+
+/* roccat_disconnect() - remove char device from hid device
+ * @minor: the minor device number returned by roccat_connect()
+ */
+void roccat_disconnect(int minor)
+{
+        struct roccat_device *device;
+
+        mutex_lock(&devices_lock);
+        device = devices[minor];
+        devices[minor] = NULL;
+        mutex_unlock(&devices_lock);
+
+        device->exist = 0; /* TODO exist maybe not needed */
+
+        device_destroy(roccat_class, MKDEV(roccat_major, minor));
+
+        if (device->open) {
+                device->hid->ll_driver->close(device->hid);
+                wake_up_interruptible(&device->wait);
+        } else {
+                kfree(device);
+        }
+}
+EXPORT_SYMBOL_GPL(roccat_disconnect);
+
+static const struct file_operations roccat_ops = {
+        .owner = THIS_MODULE,
+        .read = roccat_read,
+        .poll = roccat_poll,
+        .open = roccat_open,
+        .release = roccat_release,
+};
+
+static int __init roccat_init(void)
+{
+        int retval;
+        dev_t dev_id;
+
+        retval = alloc_chrdev_region(&dev_id, ROCCAT_FIRST_MINOR,
+                        ROCCAT_MAX_DEVICES, "roccat");
+
+        roccat_major = MAJOR(dev_id);
+
+        if (retval < 0) {
+                printk(KERN_WARNING "roccat: can't get major number\n");
+                return retval;
+        }
+
+        roccat_class = class_create(THIS_MODULE, "roccat");
+        if (IS_ERR(roccat_class)) {
+                retval = PTR_ERR(roccat_class);
+                unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
+                return retval;
+        }
+
+        cdev_init(&roccat_cdev, &roccat_ops);
+        cdev_add(&roccat_cdev, dev_id, ROCCAT_MAX_DEVICES);
+
+        return 0;
+}
+
+static void __exit roccat_exit(void)
+{
+        dev_t dev_id = MKDEV(roccat_major, 0);
+
+        cdev_del(&roccat_cdev);
+        class_destroy(roccat_class);
+        unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
+}
+
+module_init(roccat_init);
+module_exit(roccat_exit);
+
+MODULE_AUTHOR("Stefan Achatz");
+MODULE_DESCRIPTION("USB Roccat char device");
+MODULE_LICENSE("GPL v2");