diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/hid/uhid.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/hid/uhid.c | 572 |
1 files changed, 0 insertions, 572 deletions
diff --git a/ANDROID_3.4.5/drivers/hid/uhid.c b/ANDROID_3.4.5/drivers/hid/uhid.c deleted file mode 100644 index 714cd8cc..00000000 --- a/ANDROID_3.4.5/drivers/hid/uhid.c +++ /dev/null @@ -1,572 +0,0 @@ -/* - * User-space I/O driver support for HID subsystem - * Copyright (c) 2012 David Herrmann - */ - -/* - * 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. - */ - -#include <linux/atomic.h> -#include <linux/device.h> -#include <linux/fs.h> -#include <linux/hid.h> -#include <linux/input.h> -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/poll.h> -#include <linux/sched.h> -#include <linux/spinlock.h> -#include <linux/uhid.h> -#include <linux/wait.h> - -#define UHID_NAME "uhid" -#define UHID_BUFSIZE 32 - -struct uhid_device { - struct mutex devlock; - bool running; - - __u8 *rd_data; - uint rd_size; - - struct hid_device *hid; - struct uhid_event input_buf; - - wait_queue_head_t waitq; - spinlock_t qlock; - __u8 head; - __u8 tail; - struct uhid_event *outq[UHID_BUFSIZE]; - - struct mutex report_lock; - wait_queue_head_t report_wait; - atomic_t report_done; - atomic_t report_id; - struct uhid_event report_buf; -}; - -static struct miscdevice uhid_misc; - -static void uhid_queue(struct uhid_device *uhid, struct uhid_event *ev) -{ - __u8 newhead; - - newhead = (uhid->head + 1) % UHID_BUFSIZE; - - if (newhead != uhid->tail) { - uhid->outq[uhid->head] = ev; - uhid->head = newhead; - wake_up_interruptible(&uhid->waitq); - } else { - hid_warn(uhid->hid, "Output queue is full\n"); - kfree(ev); - } -} - -static int uhid_queue_event(struct uhid_device *uhid, __u32 event) -{ - unsigned long flags; - struct uhid_event *ev; - - ev = kzalloc(sizeof(*ev), GFP_KERNEL); - if (!ev) - return -ENOMEM; - - ev->type = event; - - spin_lock_irqsave(&uhid->qlock, flags); - uhid_queue(uhid, ev); - spin_unlock_irqrestore(&uhid->qlock, flags); - - return 0; -} - -static int uhid_hid_start(struct hid_device *hid) -{ - struct uhid_device *uhid = hid->driver_data; - - return uhid_queue_event(uhid, UHID_START); -} - -static void uhid_hid_stop(struct hid_device *hid) -{ - struct uhid_device *uhid = hid->driver_data; - - hid->claimed = 0; - uhid_queue_event(uhid, UHID_STOP); -} - -static int uhid_hid_open(struct hid_device *hid) -{ - struct uhid_device *uhid = hid->driver_data; - - return uhid_queue_event(uhid, UHID_OPEN); -} - -static void uhid_hid_close(struct hid_device *hid) -{ - struct uhid_device *uhid = hid->driver_data; - - uhid_queue_event(uhid, UHID_CLOSE); -} - -static int uhid_hid_input(struct input_dev *input, unsigned int type, - unsigned int code, int value) -{ - struct hid_device *hid = input_get_drvdata(input); - struct uhid_device *uhid = hid->driver_data; - unsigned long flags; - struct uhid_event *ev; - - ev = kzalloc(sizeof(*ev), GFP_ATOMIC); - if (!ev) - return -ENOMEM; - - ev->type = UHID_OUTPUT_EV; - ev->u.output_ev.type = type; - ev->u.output_ev.code = code; - ev->u.output_ev.value = value; - - spin_lock_irqsave(&uhid->qlock, flags); - uhid_queue(uhid, ev); - spin_unlock_irqrestore(&uhid->qlock, flags); - - return 0; -} - -static int uhid_hid_parse(struct hid_device *hid) -{ - struct uhid_device *uhid = hid->driver_data; - - return hid_parse_report(hid, uhid->rd_data, uhid->rd_size); -} - -static int uhid_hid_get_raw(struct hid_device *hid, unsigned char rnum, - __u8 *buf, size_t count, unsigned char rtype) -{ - struct uhid_device *uhid = hid->driver_data; - __u8 report_type; - struct uhid_event *ev; - unsigned long flags; - int ret; - size_t uninitialized_var(len); - struct uhid_feature_answer_req *req; - - if (!uhid->running) - return -EIO; - - switch (rtype) { - case HID_FEATURE_REPORT: - report_type = UHID_FEATURE_REPORT; - break; - case HID_OUTPUT_REPORT: - report_type = UHID_OUTPUT_REPORT; - break; - case HID_INPUT_REPORT: - report_type = UHID_INPUT_REPORT; - break; - default: - return -EINVAL; - } - - ret = mutex_lock_interruptible(&uhid->report_lock); - if (ret) - return ret; - - ev = kzalloc(sizeof(*ev), GFP_KERNEL); - if (!ev) { - ret = -ENOMEM; - goto unlock; - } - - spin_lock_irqsave(&uhid->qlock, flags); - ev->type = UHID_FEATURE; - ev->u.feature.id = atomic_inc_return(&uhid->report_id); - ev->u.feature.rnum = rnum; - ev->u.feature.rtype = report_type; - - atomic_set(&uhid->report_done, 0); - uhid_queue(uhid, ev); - spin_unlock_irqrestore(&uhid->qlock, flags); - - ret = wait_event_interruptible_timeout(uhid->report_wait, - atomic_read(&uhid->report_done), 5 * HZ); - - /* - * Make sure "uhid->running" is cleared on shutdown before - * "uhid->report_done" is set. - */ - smp_rmb(); - if (!ret || !uhid->running) { - ret = -EIO; - } else if (ret < 0) { - ret = -ERESTARTSYS; - } else { - spin_lock_irqsave(&uhid->qlock, flags); - req = &uhid->report_buf.u.feature_answer; - - if (req->err) { - ret = -EIO; - } else { - ret = 0; - len = min(count, - min_t(size_t, req->size, UHID_DATA_MAX)); - memcpy(buf, req->data, len); - } - - spin_unlock_irqrestore(&uhid->qlock, flags); - } - - atomic_set(&uhid->report_done, 1); - -unlock: - mutex_unlock(&uhid->report_lock); - return ret ? ret : len; -} - -static int uhid_hid_output_raw(struct hid_device *hid, __u8 *buf, size_t count, - unsigned char report_type) -{ - struct uhid_device *uhid = hid->driver_data; - __u8 rtype; - unsigned long flags; - struct uhid_event *ev; - - switch (report_type) { - case HID_FEATURE_REPORT: - rtype = UHID_FEATURE_REPORT; - break; - case HID_OUTPUT_REPORT: - rtype = UHID_OUTPUT_REPORT; - break; - default: - return -EINVAL; - } - - if (count < 1 || count > UHID_DATA_MAX) - return -EINVAL; - - ev = kzalloc(sizeof(*ev), GFP_KERNEL); - if (!ev) - return -ENOMEM; - - ev->type = UHID_OUTPUT; - ev->u.output.size = count; - ev->u.output.rtype = rtype; - memcpy(ev->u.output.data, buf, count); - - spin_lock_irqsave(&uhid->qlock, flags); - uhid_queue(uhid, ev); - spin_unlock_irqrestore(&uhid->qlock, flags); - - return count; -} - -static struct hid_ll_driver uhid_hid_driver = { - .start = uhid_hid_start, - .stop = uhid_hid_stop, - .open = uhid_hid_open, - .close = uhid_hid_close, - .hidinput_input_event = uhid_hid_input, - .parse = uhid_hid_parse, -}; - -static int uhid_dev_create(struct uhid_device *uhid, - const struct uhid_event *ev) -{ - struct hid_device *hid; - int ret; - - if (uhid->running) - return -EALREADY; - - uhid->rd_size = ev->u.create.rd_size; - if (uhid->rd_size <= 0 || uhid->rd_size > HID_MAX_DESCRIPTOR_SIZE) - return -EINVAL; - - uhid->rd_data = kmalloc(uhid->rd_size, GFP_KERNEL); - if (!uhid->rd_data) - return -ENOMEM; - - if (copy_from_user(uhid->rd_data, ev->u.create.rd_data, - uhid->rd_size)) { - ret = -EFAULT; - goto err_free; - } - - hid = hid_allocate_device(); - if (IS_ERR(hid)) { - ret = PTR_ERR(hid); - goto err_free; - } - - strncpy(hid->name, ev->u.create.name, 127); - hid->name[127] = 0; - strncpy(hid->phys, ev->u.create.phys, 63); - hid->phys[63] = 0; - strncpy(hid->uniq, ev->u.create.uniq, 63); - hid->uniq[63] = 0; - - hid->ll_driver = &uhid_hid_driver; - hid->hid_get_raw_report = uhid_hid_get_raw; - hid->hid_output_raw_report = uhid_hid_output_raw; - hid->bus = ev->u.create.bus; - hid->vendor = ev->u.create.vendor; - hid->product = ev->u.create.product; - hid->version = ev->u.create.version; - hid->country = ev->u.create.country; - hid->driver_data = uhid; - hid->dev.parent = uhid_misc.this_device; - - uhid->hid = hid; - uhid->running = true; - - ret = hid_add_device(hid); - if (ret) { - hid_err(hid, "Cannot register HID device\n"); - goto err_hid; - } - - return 0; - -err_hid: - hid_destroy_device(hid); - uhid->hid = NULL; - uhid->running = false; -err_free: - kfree(uhid->rd_data); - return ret; -} - -static int uhid_dev_destroy(struct uhid_device *uhid) -{ - if (!uhid->running) - return -EINVAL; - - /* clear "running" before setting "report_done" */ - uhid->running = false; - smp_wmb(); - atomic_set(&uhid->report_done, 1); - wake_up_interruptible(&uhid->report_wait); - - hid_destroy_device(uhid->hid); - kfree(uhid->rd_data); - - return 0; -} - -static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev) -{ - if (!uhid->running) - return -EINVAL; - - hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input.data, - min_t(size_t, ev->u.input.size, UHID_DATA_MAX), 0); - - return 0; -} - -static int uhid_dev_feature_answer(struct uhid_device *uhid, - struct uhid_event *ev) -{ - unsigned long flags; - - if (!uhid->running) - return -EINVAL; - - spin_lock_irqsave(&uhid->qlock, flags); - - /* id for old report; drop it silently */ - if (atomic_read(&uhid->report_id) != ev->u.feature_answer.id) - goto unlock; - if (atomic_read(&uhid->report_done)) - goto unlock; - - memcpy(&uhid->report_buf, ev, sizeof(*ev)); - atomic_set(&uhid->report_done, 1); - wake_up_interruptible(&uhid->report_wait); - -unlock: - spin_unlock_irqrestore(&uhid->qlock, flags); - return 0; -} - -static int uhid_char_open(struct inode *inode, struct file *file) -{ - struct uhid_device *uhid; - - uhid = kzalloc(sizeof(*uhid), GFP_KERNEL); - if (!uhid) - return -ENOMEM; - - mutex_init(&uhid->devlock); - mutex_init(&uhid->report_lock); - spin_lock_init(&uhid->qlock); - init_waitqueue_head(&uhid->waitq); - init_waitqueue_head(&uhid->report_wait); - uhid->running = false; - atomic_set(&uhid->report_done, 1); - - file->private_data = uhid; - nonseekable_open(inode, file); - - return 0; -} - -static int uhid_char_release(struct inode *inode, struct file *file) -{ - struct uhid_device *uhid = file->private_data; - unsigned int i; - - uhid_dev_destroy(uhid); - - for (i = 0; i < UHID_BUFSIZE; ++i) - kfree(uhid->outq[i]); - - kfree(uhid); - - return 0; -} - -static ssize_t uhid_char_read(struct file *file, char __user *buffer, - size_t count, loff_t *ppos) -{ - struct uhid_device *uhid = file->private_data; - int ret; - unsigned long flags; - size_t len; - - /* they need at least the "type" member of uhid_event */ - if (count < sizeof(__u32)) - return -EINVAL; - -try_again: - if (file->f_flags & O_NONBLOCK) { - if (uhid->head == uhid->tail) - return -EAGAIN; - } else { - ret = wait_event_interruptible(uhid->waitq, - uhid->head != uhid->tail); - if (ret) - return ret; - } - - ret = mutex_lock_interruptible(&uhid->devlock); - if (ret) - return ret; - - if (uhid->head == uhid->tail) { - mutex_unlock(&uhid->devlock); - goto try_again; - } else { - len = min(count, sizeof(**uhid->outq)); - if (copy_to_user(buffer, uhid->outq[uhid->tail], len)) { - ret = -EFAULT; - } else { - kfree(uhid->outq[uhid->tail]); - uhid->outq[uhid->tail] = NULL; - - spin_lock_irqsave(&uhid->qlock, flags); - uhid->tail = (uhid->tail + 1) % UHID_BUFSIZE; - spin_unlock_irqrestore(&uhid->qlock, flags); - } - } - - mutex_unlock(&uhid->devlock); - return ret ? ret : len; -} - -static ssize_t uhid_char_write(struct file *file, const char __user *buffer, - size_t count, loff_t *ppos) -{ - struct uhid_device *uhid = file->private_data; - int ret; - size_t len; - - /* we need at least the "type" member of uhid_event */ - if (count < sizeof(__u32)) - return -EINVAL; - - ret = mutex_lock_interruptible(&uhid->devlock); - if (ret) - return ret; - - memset(&uhid->input_buf, 0, sizeof(uhid->input_buf)); - len = min(count, sizeof(uhid->input_buf)); - if (copy_from_user(&uhid->input_buf, buffer, len)) { - ret = -EFAULT; - goto unlock; - } - - switch (uhid->input_buf.type) { - case UHID_CREATE: - ret = uhid_dev_create(uhid, &uhid->input_buf); - break; - case UHID_DESTROY: - ret = uhid_dev_destroy(uhid); - break; - case UHID_INPUT: - ret = uhid_dev_input(uhid, &uhid->input_buf); - break; - case UHID_FEATURE_ANSWER: - ret = uhid_dev_feature_answer(uhid, &uhid->input_buf); - break; - default: - ret = -EOPNOTSUPP; - } - -unlock: - mutex_unlock(&uhid->devlock); - - /* return "count" not "len" to not confuse the caller */ - return ret ? ret : count; -} - -static unsigned int uhid_char_poll(struct file *file, poll_table *wait) -{ - struct uhid_device *uhid = file->private_data; - - poll_wait(file, &uhid->waitq, wait); - - if (uhid->head != uhid->tail) - return POLLIN | POLLRDNORM; - - return 0; -} - -static const struct file_operations uhid_fops = { - .owner = THIS_MODULE, - .open = uhid_char_open, - .release = uhid_char_release, - .read = uhid_char_read, - .write = uhid_char_write, - .poll = uhid_char_poll, - .llseek = no_llseek, -}; - -static struct miscdevice uhid_misc = { - .fops = &uhid_fops, - .minor = MISC_DYNAMIC_MINOR, - .name = UHID_NAME, -}; - -static int __init uhid_init(void) -{ - return misc_register(&uhid_misc); -} - -static void __exit uhid_exit(void) -{ - misc_deregister(&uhid_misc); -} - -module_init(uhid_init); -module_exit(uhid_exit); -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); -MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem"); |