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path: root/drivers/hid/hidraw.c
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Diffstat (limited to 'drivers/hid/hidraw.c')
-rw-r--r--drivers/hid/hidraw.c118
1 files changed, 81 insertions, 37 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 9e50f61933c..9c2d7c23f29 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -6,7 +6,7 @@
* 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
+ * Copyright (c) 2007-2014 Jiri Kosina
*/
/*
@@ -57,10 +57,6 @@ static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count,
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;
@@ -69,6 +65,10 @@ static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count,
ret = -EIO;
break;
}
+ if (file->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ break;
+ }
/* allow O_NONBLOCK to work well from other threads */
mutex_unlock(&list->read_mutex);
@@ -104,11 +104,14 @@ out:
return ret;
}
-/* The first byte is expected to be a report number.
- * This function is to be called with the minors_lock mutex held */
+/*
+ * The first byte of the report buffer is expected to be a report number.
+ *
+ * This function is to be called with the minors_lock mutex held.
+ */
static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type)
{
- unsigned int minor = iminor(file->f_path.dentry->d_inode);
+ unsigned int minor = iminor(file_inode(file));
struct hid_device *dev;
__u8 *buf;
int ret = 0;
@@ -120,10 +123,6 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
dev = hidraw_table[minor]->hid;
- if (!dev->hid_output_raw_report) {
- ret = -ENODEV;
- goto out;
- }
if (count > HID_MAX_BUFFER_SIZE) {
hid_warn(dev, "pid %d passed too large report\n",
@@ -150,14 +149,27 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
goto out_free;
}
- ret = dev->hid_output_raw_report(dev, buf, count, report_type);
+ if ((report_type == HID_OUTPUT_REPORT) &&
+ !(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) {
+ ret = hid_hw_output_report(dev, buf, count);
+ /*
+ * compatibility with old implementation of USB-HID and I2C-HID:
+ * if the device does not support receiving output reports,
+ * on an interrupt endpoint, fallback to SET_REPORT HID command.
+ */
+ if (ret != -ENOSYS)
+ goto out_free;
+ }
+
+ ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type,
+ HID_REQ_SET_REPORT);
+
out_free:
kfree(buf);
out:
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)
{
ssize_t ret;
@@ -168,15 +180,18 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t
}
-/* This function performs a Get_Report transfer over the control endpoint
+/*
+ * This function performs a Get_Report transfer over the control endpoint
* per section 7.2.1 of the HID specification, version 1.1. The first byte
* of buffer is the report number to request, or 0x0 if the defice does not
* use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
- * or HID_INPUT_REPORT. This function is to be called with the minors_lock
- * mutex held. */
+ * or HID_INPUT_REPORT.
+ *
+ * This function is to be called with the minors_lock mutex held.
+ */
static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
{
- unsigned int minor = iminor(file->f_path.dentry->d_inode);
+ unsigned int minor = iminor(file_inode(file));
struct hid_device *dev;
__u8 *buf;
int ret = 0, len;
@@ -184,7 +199,7 @@ static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t
dev = hidraw_table[minor]->hid;
- if (!dev->hid_get_raw_report) {
+ if (!dev->ll_driver->raw_request) {
ret = -ENODEV;
goto out;
}
@@ -209,14 +224,17 @@ static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t
goto out;
}
- /* Read the first byte from the user. This is the report number,
- * which is passed to dev->hid_get_raw_report(). */
+ /*
+ * Read the first byte from the user. This is the report number,
+ * which is passed to hid_hw_raw_request().
+ */
if (copy_from_user(&report_number, buffer, 1)) {
ret = -EFAULT;
goto out_free;
}
- ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);
+ ret = hid_hw_raw_request(dev, report_number, buf, count, report_type,
+ HID_REQ_GET_REPORT);
if (ret < 0)
goto out_free;
@@ -253,6 +271,7 @@ static int hidraw_open(struct inode *inode, struct file *file)
unsigned int minor = iminor(inode);
struct hidraw *dev;
struct hidraw_list *list;
+ unsigned long flags;
int err = 0;
if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
@@ -266,11 +285,6 @@ static int hidraw_open(struct inode *inode, struct file *file)
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++) {
err = hid_hw_power(dev->hid, PM_HINT_FULLON);
@@ -283,9 +297,16 @@ static int hidraw_open(struct inode *inode, struct file *file)
if (err < 0) {
hid_hw_power(dev->hid, PM_HINT_NORMAL);
dev->open--;
+ goto out_unlock;
}
}
+ list->hidraw = hidraw_table[minor];
+ mutex_init(&list->read_mutex);
+ spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
+ list_add_tail(&list->node, &hidraw_table[minor]->list);
+ spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
+ file->private_data = list;
out_unlock:
mutex_unlock(&minors_lock);
out:
@@ -295,21 +316,35 @@ out:
}
+static int hidraw_fasync(int fd, struct file *file, int on)
+{
+ struct hidraw_list *list = file->private_data;
+
+ return fasync_helper(fd, file, on, &list->fasync);
+}
+
static void drop_ref(struct hidraw *hidraw, int exists_bit)
{
if (exists_bit) {
- hid_hw_close(hidraw->hid);
hidraw->exist = 0;
- if (hidraw->open)
+ if (hidraw->open) {
+ hid_hw_close(hidraw->hid);
wake_up_interruptible(&hidraw->wait);
+ }
+ device_destroy(hidraw_class,
+ MKDEV(hidraw_major, hidraw->minor));
} else {
--hidraw->open;
}
-
- if (!hidraw->open && !hidraw->exist) {
- device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
- hidraw_table[hidraw->minor] = NULL;
- kfree(hidraw);
+ if (!hidraw->open) {
+ if (!hidraw->exist) {
+ hidraw_table[hidraw->minor] = NULL;
+ kfree(hidraw);
+ } else {
+ /* close device for last reader */
+ hid_hw_power(hidraw->hid, PM_HINT_NORMAL);
+ hid_hw_close(hidraw->hid);
+ }
}
}
@@ -317,10 +352,13 @@ static int hidraw_release(struct inode * inode, struct file * file)
{
unsigned int minor = iminor(inode);
struct hidraw_list *list = file->private_data;
+ unsigned long flags;
mutex_lock(&minors_lock);
+ spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
list_del(&list->node);
+ spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
kfree(list);
drop_ref(hidraw_table[minor], 0);
@@ -332,7 +370,7 @@ static int hidraw_release(struct inode * inode, struct file * file)
static long hidraw_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
- struct inode *inode = file->f_path.dentry->d_inode;
+ struct inode *inode = file_inode(file);
unsigned int minor = iminor(inode);
long ret = 0;
struct hidraw *dev;
@@ -437,6 +475,7 @@ static const struct file_operations hidraw_ops = {
.open = hidraw_open,
.release = hidraw_release,
.unlocked_ioctl = hidraw_ioctl,
+ .fasync = hidraw_fasync,
#ifdef CONFIG_COMPAT
.compat_ioctl = hidraw_ioctl,
#endif
@@ -448,7 +487,9 @@ int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
struct hidraw *dev = hid->hidraw;
struct hidraw_list *list;
int ret = 0;
+ unsigned long flags;
+ spin_lock_irqsave(&dev->list_lock, flags);
list_for_each_entry(list, &dev->list, node) {
int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
@@ -463,6 +504,7 @@ int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
list->head = new_head;
kill_fasync(&list->fasync, SIGIO, POLL_IN);
}
+ spin_unlock_irqrestore(&dev->list_lock, flags);
wake_up_interruptible(&dev->wait);
return ret;
@@ -474,7 +516,7 @@ int hidraw_connect(struct hid_device *hid)
int minor, result;
struct hidraw *dev;
- /* we accept any HID device, no matter the applications */
+ /* we accept any HID device, all applications */
dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
if (!dev)
@@ -509,8 +551,8 @@ int hidraw_connect(struct hid_device *hid)
goto out;
}
- mutex_unlock(&minors_lock);
init_waitqueue_head(&dev->wait);
+ spin_lock_init(&dev->list_lock);
INIT_LIST_HEAD(&dev->list);
dev->hid = hid;
@@ -519,6 +561,7 @@ int hidraw_connect(struct hid_device *hid)
dev->exist = 1;
hid->hidraw = dev;
+ mutex_unlock(&minors_lock);
out:
return result;
@@ -563,6 +606,7 @@ int __init hidraw_init(void)
if (result < 0)
goto error_class;
+ printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n");
out:
return result;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-14 05:38:08 +0000