* 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
*/
/*
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_inode(file));
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",
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;
}
-/* 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_inode(file));
dev = hidraw_table[minor]->hid;
- if (!dev->hid_get_raw_report) {
+ if (!dev->ll_driver->raw_request) {
ret = -ENODEV;
goto out;
}
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;
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))) {
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);
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:
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);
+ }
}
}
{
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);
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);
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;
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)
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;
dev->exist = 1;
hid->hidraw = dev;
+ mutex_unlock(&minors_lock);
out:
return result;
projects / firefly-linux-kernel-4.4.55.git / blobdiff