kernel-fxtec-pro1x/drivers/hid/hidraw.c

467 lines
10 KiB
C
Raw Normal View History

/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
#include <linux/slab.h>
#include <linux/hid.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/smp_lock.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_MUTEX(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);
mutex_lock(&list->read_mutex);
while (ret == 0) {
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;
__u8 *buf;
int ret = 0;
mutex_lock(&minors_lock);
dev = hidraw_table[minor]->hid;
if (!dev->hid_output_raw_report) {
ret = -ENODEV;
goto out;
}
if (count > HID_MAX_BUFFER_SIZE) {
printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
task_pid_nr(current));
ret = -EINVAL;
goto out;
}
if (count < 2) {
printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
task_pid_nr(current));
ret = -EINVAL;
goto out;
}
buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto out;
}
if (copy_from_user(buf, buffer, count)) {
ret = -EFAULT;
goto out_free;
}
ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT);
out_free:
kfree(buf);
out:
mutex_unlock(&minors_lock);
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;
}
mutex_lock(&minors_lock);
if (!hidraw_table[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++) {
if (dev->hid->ll_driver->power) {
err = dev->hid->ll_driver->power(dev->hid, PM_HINT_FULLON);
if (err < 0)
goto out_unlock;
}
err = dev->hid->ll_driver->open(dev->hid);
if (err < 0) {
if (dev->hid->ll_driver->power)
dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
dev->open--;
}
}
out_unlock:
mutex_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])
return -ENODEV;
list_del(&list->node);
dev = hidraw_table[minor];
if (!--dev->open) {
if (list->hidraw->exist) {
if (dev->hid->ll_driver->power)
dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
dev->hid->ll_driver->close(dev->hid);
} else {
kfree(list->hidraw);
}
}
kfree(list);
return 0;
}
static long hidraw_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct inode *inode = file->f_path.dentry->d_inode;
unsigned int minor = iminor(inode);
long ret = 0;
struct hidraw *dev;
void __user *user_arg = (void __user*) arg;
mutex_lock(&minors_lock);
dev = hidraw_table[minor];
switch (cmd) {
case HIDIOCGRDESCSIZE:
if (put_user(dev->hid->rsize, (int __user *)arg))
ret = -EFAULT;
break;
case HIDIOCGRDESC:
{
__u32 len;
if (get_user(len, (int __user *)arg))
ret = -EFAULT;
else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
ret = -EINVAL;
else if (copy_to_user(user_arg + offsetof(
struct hidraw_report_descriptor,
value[0]),
dev->hid->rdesc,
min(dev->hid->rsize, len)))
ret = -EFAULT;
break;
}
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)))
ret = -EFAULT;
break;
}
default:
{
struct hid_device *hid = dev->hid;
if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) {
ret = -EINVAL;
break;
}
if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
int len;
if (!hid->name) {
ret = 0;
break;
}
len = strlen(hid->name) + 1;
if (len > _IOC_SIZE(cmd))
len = _IOC_SIZE(cmd);
ret = copy_to_user(user_arg, hid->name, len) ?
-EFAULT : len;
break;
}
if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
int len;
if (!hid->phys) {
ret = 0;
break;
}
len = strlen(hid->phys) + 1;
if (len > _IOC_SIZE(cmd))
len = _IOC_SIZE(cmd);
ret = copy_to_user(user_arg, hid->phys, len) ?
-EFAULT : len;
break;
}
}
ret = -ENOTTY;
}
mutex_unlock(&minors_lock);
return ret;
}
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,
.unlocked_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;
struct hidraw *dev;
/* we accept any HID device, no matter the applications */
dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
if (!dev)
return -ENOMEM;
result = -EINVAL;
mutex_lock(&minors_lock);
for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
if (hidraw_table[minor])
continue;
hidraw_table[minor] = dev;
result = 0;
break;
}
if (result) {
mutex_unlock(&minors_lock);
kfree(dev);
goto out;
}
dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
NULL, "%s%d", "hidraw", minor);
if (IS_ERR(dev->dev)) {
hidraw_table[minor] = NULL;
mutex_unlock(&minors_lock);
result = PTR_ERR(dev->dev);
kfree(dev);
goto out;
}
mutex_unlock(&minors_lock);
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;
mutex_lock(&minors_lock);
hidraw_table[hidraw->minor] = NULL;
mutex_unlock(&minors_lock);
device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
if (hidraw->open) {
hid->ll_driver->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 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);
}