diff options
| -rw-r--r-- | drivers/hid/Kconfig | 19 | ||||
| -rw-r--r-- | drivers/hid/Makefile | 2 | ||||
| -rw-r--r-- | drivers/hid/hid-core.c | 16 | ||||
| -rw-r--r-- | drivers/hid/hidraw.c | 395 | ||||
| -rw-r--r-- | drivers/hid/usbhid/hid-core.c | 15 | ||||
| -rw-r--r-- | include/linux/hid.h | 5 | ||||
| -rw-r--r-- | include/linux/hidraw.h | 86 |
7 files changed, 536 insertions, 2 deletions
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 19667fcc722a..cacf89e65af4 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -46,6 +46,25 @@ config HID_DEBUG If unsure, say N +config HIDRAW + bool "/dev/hidraw raw HID device support" + depends on HID + ---help--- + Say Y here if you want to support HID devices (from the USB + specification standpoint) that aren't strictly user interface + devices, like monitor controls and Uninterruptable Power Supplies. + + This module supports these devices separately using a separate + event interface on /dev/hidraw. + + There is also a /dev/hiddev configuration option in the USB HID + configuration menu. In comparison to hiddev, this device does not process + the hid events at all (no parsing, no lookups). This lets applications + to work on raw hid events when they want to, and avoid using transport-specific + userspace libhid/libusb libraries. + + If unsure, say Y. + source "drivers/hid/usbhid/Kconfig" endif # HID_SUPPORT diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile index 68d1376a53fb..1ac5103f7c93 100644 --- a/drivers/hid/Makefile +++ b/drivers/hid/Makefile @@ -4,7 +4,9 @@ hid-objs := hid-core.o hid-input.o obj-$(CONFIG_HID) += hid.o + hid-$(CONFIG_HID_DEBUG) += hid-debug.o +hid-$(CONFIG_HIDRAW) += hidraw.o obj-$(CONFIG_USB_HID) += usbhid/ obj-$(CONFIG_USB_MOUSE) += usbhid/ diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 317cf8a7b63c..2884b036495a 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -30,6 +30,7 @@ #include <linux/hid.h> #include <linux/hiddev.h> #include <linux/hid-debug.h> +#include <linux/hidraw.h> /* * Version Information @@ -979,6 +980,8 @@ int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int i if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event) hid->hiddev_report_event(hid, report); + if (hid->claimed & HID_CLAIMED_HIDRAW) + hidraw_report_event(hid, data, size); for (n = 0; n < report->maxfield; n++) hid_input_field(hid, report->field[n], data, interrupt); @@ -990,5 +993,18 @@ int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int i } EXPORT_SYMBOL_GPL(hid_input_report); +static int __init hid_init(void) +{ + return hidraw_init(); +} + +static void __exit hid_exit(void) +{ + hidraw_exit(); +} + +module_init(hid_init); +module_exit(hid_exit); + MODULE_LICENSE(DRIVER_LICENSE); diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c new file mode 100644 index 000000000000..20ebba1032b8 --- /dev/null +++ b/drivers/hid/hidraw.c @@ -0,0 +1,395 @@ +/* + * HID raw devices, giving access to raw HID events. + * + * In comparison to hiddev, this device does not process the + * hid events at all (no parsing, no lookups). This lets applications + * to work on raw hid events as they want to, and avoids a need to + * use a transport-specific userspace libhid/libusb libraries. + * + * Copyright (c) 2007 Jiri Kosina + */ + +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/cdev.h> +#include <linux/poll.h> +#include <linux/device.h> +#include <linux/major.h> +#include <linux/hid.h> +#include <linux/mutex.h> + +#include <linux/hidraw.h> + +static int hidraw_major; +static struct cdev hidraw_cdev; +static struct class *hidraw_class; +static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; +static DEFINE_SPINLOCK(minors_lock); + +static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) +{ + struct hidraw_list *list = file->private_data; + int ret = 0, len; + char *report; + DECLARE_WAITQUEUE(wait, current); + + while (ret == 0) { + + mutex_lock(&list->read_mutex); + + if (list->head == list->tail) { + add_wait_queue(&list->hidraw->wait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + + while (list->head == list->tail) { + if (file->f_flags & O_NONBLOCK) { + ret = -EAGAIN; + break; + } + if (signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + if (!list->hidraw->exist) { + ret = -EIO; + break; + } + + /* allow O_NONBLOCK to work well from other threads */ + mutex_unlock(&list->read_mutex); + schedule(); + mutex_lock(&list->read_mutex); + set_current_state(TASK_INTERRUPTIBLE); + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(&list->hidraw->wait, &wait); + } + + if (ret) + goto out; + + report = list->buffer[list->tail].value; + len = list->buffer[list->tail].len > count ? + count : list->buffer[list->tail].len; + + if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { + ret = -EFAULT; + goto out; + } + ret += len; + + kfree(list->buffer[list->tail].value); + list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); + } +out: + mutex_unlock(&list->read_mutex); + return ret; +} + +/* the first byte is expected to be a report number */ +static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) +{ + unsigned int minor = iminor(file->f_path.dentry->d_inode); + struct hid_device *dev = hidraw_table[minor]->hid; + __u8 *buf; + int ret = 0; + + if (!dev->hid_output_raw_report) + return -ENODEV; + + if (count > HID_MIN_BUFFER_SIZE) { + printk(KERN_WARNING "hidraw: pid %d passed too large report\n", + current->pid); + return -EINVAL; + } + + if (count < 2) { + printk(KERN_WARNING "hidraw: pid %d passed too short report\n", + current->pid); + return -EINVAL; + } + + buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); + if (!buf) + return -ENOMEM; + + if (copy_from_user(buf, buffer, count)) { + ret = -EFAULT; + goto out; + } + + ret = dev->hid_output_raw_report(dev, buf, count); +out: + kfree(buf); + return ret; +} + +static unsigned int hidraw_poll(struct file *file, poll_table *wait) +{ + struct hidraw_list *list = file->private_data; + + poll_wait(file, &list->hidraw->wait, wait); + if (list->head != list->tail) + return POLLIN | POLLRDNORM; + if (!list->hidraw->exist) + return POLLERR | POLLHUP; + return 0; +} + +static int hidraw_open(struct inode *inode, struct file *file) +{ + unsigned int minor = iminor(inode); + struct hidraw *dev; + struct hidraw_list *list; + int err = 0; + + if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { + err = -ENOMEM; + goto out; + } + + spin_lock(&minors_lock); + if (!hidraw_table[minor]) { + printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n", + minor); + kfree(list); + err = -ENODEV; + goto out_unlock; + } + + list->hidraw = hidraw_table[minor]; + mutex_init(&list->read_mutex); + list_add_tail(&list->node, &hidraw_table[minor]->list); + file->private_data = list; + + dev = hidraw_table[minor]; + if (!dev->open++) + dev->hid->hid_open(dev->hid); + +out_unlock: + spin_unlock(&minors_lock); +out: + return err; + +} + +static int hidraw_release(struct inode * inode, struct file * file) +{ + unsigned int minor = iminor(inode); + struct hidraw *dev; + struct hidraw_list *list = file->private_data; + + if (!hidraw_table[minor]) { + printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n", + minor); + return -ENODEV; + } + + list_del(&list->node); + dev = hidraw_table[minor]; + if (!dev->open--) { + if (list->hidraw->exist) + dev->hid->hid_close(dev->hid); + else + kfree(list->hidraw); + } + + return 0; +} + +static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) +{ + unsigned int minor = iminor(inode); + struct hidraw *dev = hidraw_table[minor]; + void __user *user_arg = (void __user*) arg; + + switch (cmd) { + case HIDIOCGRDESCSIZE: + if (put_user(dev->hid->rsize, (int __user *)arg)) + return -EFAULT; + return 0; + + case HIDIOCGRDESC: + { + __u32 len; + + if (get_user(len, (int __user *)arg)) + return -EFAULT; + if (copy_to_user(*((__u8 **)(user_arg + + sizeof(__u32))), + dev->hid->rdesc, len)) + return -EFAULT; + return 0; + } + case HIDIOCGRAWINFO: + { + struct hidraw_devinfo dinfo; + + dinfo.bustype = dev->hid->bus; + dinfo.vendor = dev->hid->vendor; + dinfo.product = dev->hid->product; + if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) + return -EFAULT; + + return 0; + } + default: + printk(KERN_EMERG "hidraw: unsupported ioctl() %x\n", + cmd); + } + return -EINVAL; +} + +static const struct file_operations hidraw_ops = { + .owner = THIS_MODULE, + .read = hidraw_read, + .write = hidraw_write, + .poll = hidraw_poll, + .open = hidraw_open, + .release = hidraw_release, + .ioctl = hidraw_ioctl, +}; + +void hidraw_report_event(struct hid_device *hid, u8 *data, int len) +{ + struct hidraw *dev = hid->hidraw; + struct hidraw_list *list; + + list_for_each_entry(list, &dev->list, node) { + list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC); + list->buffer[list->head].len = len; + list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); + kill_fasync(&list->fasync, SIGIO, POLL_IN); + } + + wake_up_interruptible(&dev->wait); +} +EXPORT_SYMBOL_GPL(hidraw_report_event); + +int hidraw_connect(struct hid_device *hid) +{ + int minor, result = -EINVAL; + struct hidraw *dev; + + /* TODO currently we accept any HID device. This should later + * probably be fixed to accept only those devices which provide + * non-input applications + */ + + if (!(dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL))) + return -1; + + spin_lock(&minors_lock); + + for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { + if (hidraw_table[minor]) + continue; + hidraw_table[minor] = dev; + result = 0; + break; + } + + spin_unlock(&minors_lock); + + if (result) + goto out; + + dev->dev = device_create(hidraw_class, NULL, MKDEV(hidraw_major, minor), + "%s%d", "hidraw", minor); + + if (IS_ERR(dev->dev)) { + spin_lock(&minors_lock); + hidraw_table[minor] = NULL; + spin_unlock(&minors_lock); + result = PTR_ERR(dev->dev); + goto out; + } + + init_waitqueue_head(&dev->wait); + INIT_LIST_HEAD(&dev->list); + + dev->hid = hid; + dev->minor = minor; + + dev->exist = 1; + hid->hidraw = dev; + +out: + return result; + +} +EXPORT_SYMBOL_GPL(hidraw_connect); + +void hidraw_disconnect(struct hid_device *hid) +{ + struct hidraw *hidraw = hid->hidraw; + + hidraw->exist = 0; + + spin_lock(&minors_lock); + hidraw_table[hidraw->minor] = NULL; + spin_unlock(&minors_lock); + + device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor)); + + if (hidraw->open) { + hid->hid_close(hid); + wake_up_interruptible(&hidraw->wait); + } else { + kfree(hidraw); + } +} +EXPORT_SYMBOL_GPL(hidraw_disconnect); + +int __init hidraw_init(void) +{ + int result; + dev_t dev_id; + + result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, + HIDRAW_MAX_DEVICES, "hidraw"); + + hidraw_major = MAJOR(dev_id); + + if (result < 0) { + printk(KERN_WARNING "hidraw: can't get major number\n"); + result = 0; + goto out; + } + + hidraw_class = class_create(THIS_MODULE, "hidraw"); + if (IS_ERR(hidraw_class)) { + result = PTR_ERR(hidraw_class); + unregister_chrdev(hidraw_major, "hidraw"); + goto out; + } + + cdev_init(&hidraw_cdev, &hidraw_ops); + cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); +out: + return result; +} + +void __exit hidraw_exit(void) +{ + dev_t dev_id = MKDEV(hidraw_major, 0); + + cdev_del(&hidraw_cdev); + class_destroy(hidraw_class); + unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); + +} diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index 74b817d7968d..3a9563195850 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -32,6 +32,7 @@ #include <linux/hid.h> #include <linux/hiddev.h> #include <linux/hid-debug.h> +#include <linux/hidraw.h> #include "usbhid.h" /* @@ -932,6 +933,8 @@ static void hid_disconnect(struct usb_interface *intf) hidinput_disconnect(hid); if (hid->claimed & HID_CLAIMED_HIDDEV) hiddev_disconnect(hid); + if (hid->claimed & HID_CLAIMED_HIDRAW) + hidraw_disconnect(hid); usb_free_urb(usbhid->urbin); usb_free_urb(usbhid->urbctrl); @@ -964,11 +967,13 @@ static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id) hid->claimed |= HID_CLAIMED_INPUT; if (!hiddev_connect(hid)) hid->claimed |= HID_CLAIMED_HIDDEV; + if (!hidraw_connect(hid)) + hid->claimed |= HID_CLAIMED_HIDRAW; usb_set_intfdata(intf, hid); if (!hid->claimed) { - printk ("HID device not claimed by input or hiddev\n"); + printk ("HID device claimed by neither input, hiddev nor hidraw\n"); hid_disconnect(intf); return -ENODEV; } @@ -984,10 +989,16 @@ static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id) if (hid->claimed & HID_CLAIMED_INPUT) printk("input"); - if (hid->claimed == (HID_CLAIMED_INPUT | HID_CLAIMED_HIDDEV)) + if ((hid->claimed & HID_CLAIMED_INPUT) && ((hid->claimed & HID_CLAIMED_HIDDEV) || + hid->claimed & HID_CLAIMED_HIDRAW)) printk(","); if (hid->claimed & HID_CLAIMED_HIDDEV) printk("hiddev%d", hid->minor); + if ((hid->claimed & HID_CLAIMED_INPUT) && (hid->claimed & HID_CLAIMED_HIDDEV) && + (hid->claimed & HID_CLAIMED_HIDRAW)) + printk(","); + if (hid->claimed & HID_CLAIMED_HIDRAW) + printk("hidraw%d", ((struct hidraw*)hid->hidraw)->minor); c = "Device"; for (i = 0; i < hid->maxcollection; i++) { diff --git a/include/linux/hid.h b/include/linux/hid.h index 898103b401f1..0ac2b5260b26 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -403,6 +403,7 @@ struct hid_control_fifo { #define HID_CLAIMED_INPUT 1 #define HID_CLAIMED_HIDDEV 2 +#define HID_CLAIMED_HIDRAW 4 #define HID_CTRL_RUNNING 1 #define HID_OUT_RUNNING 2 @@ -438,6 +439,7 @@ struct hid_device { /* device report descriptor */ struct list_head inputs; /* The list of inputs */ void *hiddev; /* The hiddev structure */ + void *hidraw; int minor; /* Hiddev minor number */ wait_queue_head_t wait; /* For sleeping */ @@ -458,6 +460,9 @@ struct hid_device { /* device report descriptor */ void (*hiddev_hid_event) (struct hid_device *, struct hid_field *field, struct hid_usage *, __s32); void (*hiddev_report_event) (struct hid_device *, struct hid_report *); + + /* handler for raw output data, used by hidraw */ + int (*hid_output_raw_report) (struct hid_device *, __u8 *, size_t); #ifdef CONFIG_USB_HIDINPUT_POWERBOOK unsigned long pb_pressed_fn[NBITS(KEY_MAX)]; unsigned long pb_pressed_numlock[NBITS(KEY_MAX)]; diff --git a/include/linux/hidraw.h b/include/linux/hidraw.h new file mode 100644 index 000000000000..6676cd5e9954 --- /dev/null +++ b/include/linux/hidraw.h @@ -0,0 +1,86 @@ +#ifndef _HIDRAW_H +#define _HIDRAW_H + +/* + * Copyright (c) 2007 Jiri Kosina + */ + +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + */ + +struct hidraw_report_descriptor { + __u32 size; + __u8 *value; +}; + +struct hidraw_devinfo { + __u32 bustype; + __s16 vendor; + __s16 product; +}; + +/* ioctl interface */ +#define HIDIOCGRDESCSIZE _IOR('H', 0x01, int) +#define HIDIOCGRDESC _IOR('H', 0x02, struct hidraw_report_descriptor) +#define HIDIOCGRAWINFO _IOR('H', 0x03, struct hidraw_devinfo) + +#define HIDRAW_FIRST_MINOR 0 +#define HIDRAW_MAX_DEVICES 64 +/* number of reports to buffer */ +#define HIDRAW_BUFFER_SIZE 64 + + +/* kernel-only API declarations */ +#ifdef __KERNEL__ + +#include <linux/hid.h> + +struct hidraw { + unsigned int minor; + int exist; + int open; + wait_queue_head_t wait; + struct hid_device *hid; + struct device *dev; + struct list_head list; +}; + +struct hidraw_report { + __u8 *value; + int len; +}; + +struct hidraw_list { + struct hidraw_report buffer[HIDRAW_BUFFER_SIZE]; + int head; + int tail; + struct fasync_struct *fasync; + struct hidraw *hidraw; + struct list_head node; + struct mutex read_mutex; +}; + +#ifdef CONFIG_HIDRAW +int hidraw_init(void); +void hidraw_exit(void); +void hidraw_report_event(struct hid_device *, u8 *, int); +int hidraw_connect(struct hid_device *); +void hidraw_disconnect(struct hid_device *); +#else +static inline int hidraw_init(void) { return 0; } +static inline void hidraw_exit(void) { } +static inline void hidraw_report_event(struct hid_device *hid, u8 *data, int len) { } +static inline int hidraw_connect(struct hid_device *hid) { return -1; } +static inline void hidraw_disconnect(struct hid_device *hid) { } +#endif + +#endif + +#endif |
