diff options
Diffstat (limited to 'drivers/input/evdev.c')
| -rw-r--r-- | drivers/input/evdev.c | 1571 |
1 files changed, 1012 insertions, 559 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 9f2352bd834..fd325ec9f06 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -8,720 +8,1173 @@ * the Free Software Foundation. */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #define EVDEV_MINOR_BASE 64 #define EVDEV_MINORS 32 -#define EVDEV_BUFFER_SIZE 64 +#define EVDEV_MIN_BUFFER_SIZE 64U +#define EVDEV_BUF_PACKETS 8 #include <linux/poll.h> +#include <linux/sched.h> #include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/mm.h> #include <linux/module.h> #include <linux/init.h> -#include <linux/input.h> +#include <linux/input/mt.h> #include <linux/major.h> -#include <linux/smp_lock.h> #include <linux/device.h> -#include <linux/compat.h> +#include <linux/cdev.h> +#include "input-compat.h" struct evdev { - int exist; int open; - int minor; - char name[16]; struct input_handle handle; wait_queue_head_t wait; - struct evdev_list *grab; - struct list_head list; + struct evdev_client __rcu *grab; + struct list_head client_list; + spinlock_t client_lock; /* protects client_list */ + struct mutex mutex; + struct device dev; + struct cdev cdev; + bool exist; }; -struct evdev_list { - struct input_event buffer[EVDEV_BUFFER_SIZE]; - int head; - int tail; +struct evdev_client { + unsigned int head; + unsigned int tail; + unsigned int packet_head; /* [future] position of the first element of next packet */ + spinlock_t buffer_lock; /* protects access to buffer, head and tail */ struct fasync_struct *fasync; struct evdev *evdev; struct list_head node; + int clkid; + bool revoked; + unsigned int bufsize; + struct input_event buffer[]; }; -static struct evdev *evdev_table[EVDEV_MINORS]; +/* flush queued events of type @type, caller must hold client->buffer_lock */ +static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) +{ + unsigned int i, head, num; + unsigned int mask = client->bufsize - 1; + bool is_report; + struct input_event *ev; + + BUG_ON(type == EV_SYN); + + head = client->tail; + client->packet_head = client->tail; + + /* init to 1 so a leading SYN_REPORT will not be dropped */ + num = 1; + + for (i = client->tail; i != client->head; i = (i + 1) & mask) { + ev = &client->buffer[i]; + is_report = ev->type == EV_SYN && ev->code == SYN_REPORT; + + if (ev->type == type) { + /* drop matched entry */ + continue; + } else if (is_report && !num) { + /* drop empty SYN_REPORT groups */ + continue; + } else if (head != i) { + /* move entry to fill the gap */ + client->buffer[head].time = ev->time; + client->buffer[head].type = ev->type; + client->buffer[head].code = ev->code; + client->buffer[head].value = ev->value; + } + + num++; + head = (head + 1) & mask; + + if (is_report) { + num = 0; + client->packet_head = head; + } + } + + client->head = head; +} -static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) +/* queue SYN_DROPPED event */ +static void evdev_queue_syn_dropped(struct evdev_client *client) +{ + unsigned long flags; + struct input_event ev; + ktime_t time; + + time = ktime_get(); + if (client->clkid != CLOCK_MONOTONIC) + time = ktime_sub(time, ktime_get_monotonic_offset()); + + ev.time = ktime_to_timeval(time); + ev.type = EV_SYN; + ev.code = SYN_DROPPED; + ev.value = 0; + + spin_lock_irqsave(&client->buffer_lock, flags); + + client->buffer[client->head++] = ev; + client->head &= client->bufsize - 1; + + if (unlikely(client->head == client->tail)) { + /* drop queue but keep our SYN_DROPPED event */ + client->tail = (client->head - 1) & (client->bufsize - 1); + client->packet_head = client->tail; + } + + spin_unlock_irqrestore(&client->buffer_lock, flags); +} + +static void __pass_event(struct evdev_client *client, + const struct input_event *event) +{ + client->buffer[client->head++] = *event; + client->head &= client->bufsize - 1; + + if (unlikely(client->head == client->tail)) { + /* + * This effectively "drops" all unconsumed events, leaving + * EV_SYN/SYN_DROPPED plus the newest event in the queue. + */ + client->tail = (client->head - 2) & (client->bufsize - 1); + + client->buffer[client->tail].time = event->time; + client->buffer[client->tail].type = EV_SYN; + client->buffer[client->tail].code = SYN_DROPPED; + client->buffer[client->tail].value = 0; + + client->packet_head = client->tail; + } + + if (event->type == EV_SYN && event->code == SYN_REPORT) { + client->packet_head = client->head; + kill_fasync(&client->fasync, SIGIO, POLL_IN); + } +} + +static void evdev_pass_values(struct evdev_client *client, + const struct input_value *vals, unsigned int count, + ktime_t mono, ktime_t real) +{ + struct evdev *evdev = client->evdev; + const struct input_value *v; + struct input_event event; + bool wakeup = false; + + if (client->revoked) + return; + + event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? + mono : real); + + /* Interrupts are disabled, just acquire the lock. */ + spin_lock(&client->buffer_lock); + + for (v = vals; v != vals + count; v++) { + event.type = v->type; + event.code = v->code; + event.value = v->value; + __pass_event(client, &event); + if (v->type == EV_SYN && v->code == SYN_REPORT) + wakeup = true; + } + + spin_unlock(&client->buffer_lock); + + if (wakeup) + wake_up_interruptible(&evdev->wait); +} + +/* + * Pass incoming events to all connected clients. + */ +static void evdev_events(struct input_handle *handle, + const struct input_value *vals, unsigned int count) { struct evdev *evdev = handle->private; - struct evdev_list *list; + struct evdev_client *client; + ktime_t time_mono, time_real; - if (evdev->grab) { - list = evdev->grab; + time_mono = ktime_get(); + time_real = ktime_sub(time_mono, ktime_get_monotonic_offset()); - do_gettimeofday(&list->buffer[list->head].time); - list->buffer[list->head].type = type; - list->buffer[list->head].code = code; - list->buffer[list->head].value = value; - list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); + rcu_read_lock(); - kill_fasync(&list->fasync, SIGIO, POLL_IN); - } else - list_for_each_entry(list, &evdev->list, node) { + client = rcu_dereference(evdev->grab); - do_gettimeofday(&list->buffer[list->head].time); - list->buffer[list->head].type = type; - list->buffer[list->head].code = code; - list->buffer[list->head].value = value; - list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); + if (client) + evdev_pass_values(client, vals, count, time_mono, time_real); + else + list_for_each_entry_rcu(client, &evdev->client_list, node) + evdev_pass_values(client, vals, count, + time_mono, time_real); - kill_fasync(&list->fasync, SIGIO, POLL_IN); - } + rcu_read_unlock(); +} - wake_up_interruptible(&evdev->wait); +/* + * Pass incoming event to all connected clients. + */ +static void evdev_event(struct input_handle *handle, + unsigned int type, unsigned int code, int value) +{ + struct input_value vals[] = { { type, code, value } }; + + evdev_events(handle, vals, 1); } static int evdev_fasync(int fd, struct file *file, int on) { - int retval; - struct evdev_list *list = file->private_data; - retval = fasync_helper(fd, file, on, &list->fasync); - return retval < 0 ? retval : 0; + struct evdev_client *client = file->private_data; + + return fasync_helper(fd, file, on, &client->fasync); } -static int evdev_flush(struct file * file) +static int evdev_flush(struct file *file, fl_owner_t id) { - struct evdev_list *list = file->private_data; - if (!list->evdev->exist) return -ENODEV; - return input_flush_device(&list->evdev->handle, file); + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; + int retval; + + retval = mutex_lock_interruptible(&evdev->mutex); + if (retval) + return retval; + + if (!evdev->exist || client->revoked) + retval = -ENODEV; + else + retval = input_flush_device(&evdev->handle, file); + + mutex_unlock(&evdev->mutex); + return retval; } -static void evdev_free(struct evdev *evdev) +static void evdev_free(struct device *dev) { - evdev_table[evdev->minor] = NULL; + struct evdev *evdev = container_of(dev, struct evdev, dev); + + input_put_device(evdev->handle.dev); kfree(evdev); } -static int evdev_release(struct inode * inode, struct file * file) +/* + * Grabs an event device (along with underlying input device). + * This function is called with evdev->mutex taken. + */ +static int evdev_grab(struct evdev *evdev, struct evdev_client *client) { - struct evdev_list *list = file->private_data; + int error; - if (list->evdev->grab == list) { - input_release_device(&list->evdev->handle); - list->evdev->grab = NULL; - } + if (evdev->grab) + return -EBUSY; - evdev_fasync(-1, file, 0); - list_del(&list->node); + error = input_grab_device(&evdev->handle); + if (error) + return error; - if (!--list->evdev->open) { - if (list->evdev->exist) - input_close_device(&list->evdev->handle); - else - evdev_free(list->evdev); - } + rcu_assign_pointer(evdev->grab, client); - kfree(list); return 0; } -static int evdev_open(struct inode * inode, struct file * file) +static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) { - struct evdev_list *list; - int i = iminor(inode) - EVDEV_MINOR_BASE; - int accept_err; + struct evdev_client *grab = rcu_dereference_protected(evdev->grab, + lockdep_is_held(&evdev->mutex)); - if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) - return -ENODEV; + if (grab != client) + return -EINVAL; - if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) - return accept_err; + rcu_assign_pointer(evdev->grab, NULL); + synchronize_rcu(); + input_release_device(&evdev->handle); - if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL))) - return -ENOMEM; - memset(list, 0, sizeof(struct evdev_list)); + return 0; +} + +static void evdev_attach_client(struct evdev *evdev, + struct evdev_client *client) +{ + spin_lock(&evdev->client_lock); + list_add_tail_rcu(&client->node, &evdev->client_list); + spin_unlock(&evdev->client_lock); +} + +static void evdev_detach_client(struct evdev *evdev, + struct evdev_client *client) +{ + spin_lock(&evdev->client_lock); + list_del_rcu(&client->node); + spin_unlock(&evdev->client_lock); + synchronize_rcu(); +} + +static int evdev_open_device(struct evdev *evdev) +{ + int retval; + + retval = mutex_lock_interruptible(&evdev->mutex); + if (retval) + return retval; + + if (!evdev->exist) + retval = -ENODEV; + else if (!evdev->open++) { + retval = input_open_device(&evdev->handle); + if (retval) + evdev->open--; + } + + mutex_unlock(&evdev->mutex); + return retval; +} + +static void evdev_close_device(struct evdev *evdev) +{ + mutex_lock(&evdev->mutex); + + if (evdev->exist && !--evdev->open) + input_close_device(&evdev->handle); + + mutex_unlock(&evdev->mutex); +} + +/* + * Wake up users waiting for IO so they can disconnect from + * dead device. + */ +static void evdev_hangup(struct evdev *evdev) +{ + struct evdev_client *client; + + spin_lock(&evdev->client_lock); + list_for_each_entry(client, &evdev->client_list, node) + kill_fasync(&client->fasync, SIGIO, POLL_HUP); + spin_unlock(&evdev->client_lock); + + wake_up_interruptible(&evdev->wait); +} + +static int evdev_release(struct inode *inode, struct file *file) +{ + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; + + mutex_lock(&evdev->mutex); + evdev_ungrab(evdev, client); + mutex_unlock(&evdev->mutex); + + evdev_detach_client(evdev, client); - list->evdev = evdev_table[i]; - list_add_tail(&list->node, &evdev_table[i]->list); - file->private_data = list; + if (is_vmalloc_addr(client)) + vfree(client); + else + kfree(client); - if (!list->evdev->open++) - if (list->evdev->exist) - input_open_device(&list->evdev->handle); + evdev_close_device(evdev); return 0; } -#ifdef CONFIG_COMPAT -struct input_event_compat { - struct compat_timeval time; - __u16 type; - __u16 code; - __s32 value; -}; +static unsigned int evdev_compute_buffer_size(struct input_dev *dev) +{ + unsigned int n_events = + max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, + EVDEV_MIN_BUFFER_SIZE); -#ifdef CONFIG_X86_64 -# define COMPAT_TEST test_thread_flag(TIF_IA32) -#elif defined(CONFIG_IA64) -# define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current)) -#elif defined(CONFIG_ARCH_S390) -# define COMPAT_TEST test_thread_flag(TIF_31BIT) -#elif defined(CONFIG_MIPS) -# define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR) -#else -# define COMPAT_TEST test_thread_flag(TIF_32BIT) -#endif + return roundup_pow_of_two(n_events); +} -static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) +static int evdev_open(struct inode *inode, struct file *file) { - struct evdev_list *list = file->private_data; - struct input_event_compat event; + struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); + unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); + unsigned int size = sizeof(struct evdev_client) + + bufsize * sizeof(struct input_event); + struct evdev_client *client; + int error; + + client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); + if (!client) + client = vzalloc(size); + if (!client) + return -ENOMEM; + + client->bufsize = bufsize; + spin_lock_init(&client->buffer_lock); + client->evdev = evdev; + evdev_attach_client(evdev, client); + + error = evdev_open_device(evdev); + if (error) + goto err_free_client; + + file->private_data = client; + nonseekable_open(inode, file); + + return 0; + + err_free_client: + evdev_detach_client(evdev, client); + kfree(client); + return error; +} + +static ssize_t evdev_write(struct file *file, const char __user *buffer, + size_t count, loff_t *ppos) +{ + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; + struct input_event event; int retval = 0; - while (retval < count) { - if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat))) - return -EFAULT; - input_event(list->evdev->handle.dev, event.type, event.code, event.value); - retval += sizeof(struct input_event_compat); + if (count != 0 && count < input_event_size()) + return -EINVAL; + + retval = mutex_lock_interruptible(&evdev->mutex); + if (retval) + return retval; + + if (!evdev->exist || client->revoked) { + retval = -ENODEV; + goto out; + } + + while (retval + input_event_size() <= count) { + + if (input_event_from_user(buffer + retval, &event)) { + retval = -EFAULT; + goto out; + } + retval += input_event_size(); + + input_inject_event(&evdev->handle, + event.type, event.code, event.value); } + out: + mutex_unlock(&evdev->mutex); return retval; } -#endif -static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) +static int evdev_fetch_next_event(struct evdev_client *client, + struct input_event *event) +{ + int have_event; + + spin_lock_irq(&client->buffer_lock); + + have_event = client->packet_head != client->tail; + if (have_event) { + *event = client->buffer[client->tail++]; + client->tail &= client->bufsize - 1; + } + + spin_unlock_irq(&client->buffer_lock); + + return have_event; +} + +static ssize_t evdev_read(struct file *file, char __user *buffer, + size_t count, loff_t *ppos) { - struct evdev_list *list = file->private_data; + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; struct input_event event; - int retval = 0; + size_t read = 0; + int error; + + if (count != 0 && count < input_event_size()) + return -EINVAL; + + for (;;) { + if (!evdev->exist || client->revoked) + return -ENODEV; + + if (client->packet_head == client->tail && + (file->f_flags & O_NONBLOCK)) + return -EAGAIN; + + /* + * count == 0 is special - no IO is done but we check + * for error conditions (see above). + */ + if (count == 0) + break; + + while (read + input_event_size() <= count && + evdev_fetch_next_event(client, &event)) { + + if (input_event_to_user(buffer + read, &event)) + return -EFAULT; + + read += input_event_size(); + } + + if (read) + break; + + if (!(file->f_flags & O_NONBLOCK)) { + error = wait_event_interruptible(evdev->wait, + client->packet_head != client->tail || + !evdev->exist || client->revoked); + if (error) + return error; + } + } + + return read; +} + +/* No kernel lock - fine */ +static unsigned int evdev_poll(struct file *file, poll_table *wait) +{ + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; + unsigned int mask; + + poll_wait(file, &evdev->wait, wait); - if (!list->evdev->exist) return -ENODEV; + if (evdev->exist && !client->revoked) + mask = POLLOUT | POLLWRNORM; + else + mask = POLLHUP | POLLERR; + + if (client->packet_head != client->tail) + mask |= POLLIN | POLLRDNORM; + + return mask; +} #ifdef CONFIG_COMPAT - if (COMPAT_TEST) - return evdev_write_compat(file, buffer, count, ppos); -#endif - while (retval < count) { +#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) +#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) - if (copy_from_user(&event, buffer + retval, sizeof(struct input_event))) +#ifdef __BIG_ENDIAN +static int bits_to_user(unsigned long *bits, unsigned int maxbit, + unsigned int maxlen, void __user *p, int compat) +{ + int len, i; + + if (compat) { + len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); + if (len > maxlen) + len = maxlen; + + for (i = 0; i < len / sizeof(compat_long_t); i++) + if (copy_to_user((compat_long_t __user *) p + i, + (compat_long_t *) bits + + i + 1 - ((i % 2) << 1), + sizeof(compat_long_t))) + return -EFAULT; + } else { + len = BITS_TO_LONGS(maxbit) * sizeof(long); + if (len > maxlen) + len = maxlen; + + if (copy_to_user(p, bits, len)) return -EFAULT; - input_event(list->evdev->handle.dev, event.type, event.code, event.value); - retval += sizeof(struct input_event); } - return retval; + return len; +} +#else +static int bits_to_user(unsigned long *bits, unsigned int maxbit, + unsigned int maxlen, void __user *p, int compat) +{ + int len = compat ? + BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : + BITS_TO_LONGS(maxbit) * sizeof(long); + + if (len > maxlen) + len = maxlen; + + return copy_to_user(p, bits, len) ? -EFAULT : len; } +#endif /* __BIG_ENDIAN */ -#ifdef CONFIG_COMPAT -static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos) +#else + +static int bits_to_user(unsigned long *bits, unsigned int maxbit, + unsigned int maxlen, void __user *p, int compat) { - struct evdev_list *list = file->private_data; - int retval; + int len = BITS_TO_LONGS(maxbit) * sizeof(long); - if (count < sizeof(struct input_event_compat)) - return -EINVAL; + if (len > maxlen) + len = maxlen; - if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) - return -EAGAIN; + return copy_to_user(p, bits, len) ? -EFAULT : len; +} - retval = wait_event_interruptible(list->evdev->wait, - list->head != list->tail || (!list->evdev->exist)); +#endif /* CONFIG_COMPAT */ - if (retval) - return retval; +static int str_to_user(const char *str, unsigned int maxlen, void __user *p) +{ + int len; + + if (!str) + return -ENOENT; + + len = strlen(str) + 1; + if (len > maxlen) + len = maxlen; + + return copy_to_user(p, str, len) ? -EFAULT : len; +} - if (!list->evdev->exist) - return -ENODEV; - - while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) { - struct input_event *event = (struct input_event *) list->buffer + list->tail; - struct input_event_compat event_compat; - event_compat.time.tv_sec = event->time.tv_sec; - event_compat.time.tv_usec = event->time.tv_usec; - event_compat.type = event->type; - event_compat.code = event->code; - event_compat.value = event->value; - - if (copy_to_user(buffer + retval, &event_compat, - sizeof(struct input_event_compat))) return -EFAULT; - list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); - retval += sizeof(struct input_event_compat); +static int handle_eviocgbit(struct input_dev *dev, + unsigned int type, unsigned int size, + void __user *p, int compat_mode) +{ + unsigned long *bits; + int len; + + switch (type) { + + case 0: bits = dev->evbit; len = EV_MAX; break; + case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; + case EV_REL: bits = dev->relbit; len = REL_MAX; break; + case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; + case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; + case EV_LED: bits = dev->ledbit; len = LED_MAX; break; + case EV_SND: bits = dev->sndbit; len = SND_MAX; break; + case EV_FF: bits = dev->ffbit; len = FF_MAX; break; + case EV_SW: bits = dev->swbit; len = SW_MAX; break; + default: return -EINVAL; } - return retval; + return bits_to_user(bits, len, size, p, compat_mode); } -#endif -static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) +static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) { - struct evdev_list *list = file->private_data; - int retval; + struct input_keymap_entry ke = { + .len = sizeof(unsigned int), + .flags = 0, + }; + int __user *ip = (int __user *)p; + int error; -#ifdef CONFIG_COMPAT - if (COMPAT_TEST) - return evdev_read_compat(file, buffer, count, ppos); -#endif + /* legacy case */ + if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) + return -EFAULT; - if (count < sizeof(struct input_event)) + error = input_get_keycode(dev, &ke); + if (error) + return error; + + if (put_user(ke.keycode, ip + 1)) + return -EFAULT; + + return 0; +} + +static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) +{ + struct input_keymap_entry ke; + int error; + + if (copy_from_user(&ke, p, sizeof(ke))) + return -EFAULT; + + error = input_get_keycode(dev, &ke); + if (error) + return error; + + if (copy_to_user(p, &ke, sizeof(ke))) + return -EFAULT; + + return 0; +} + +static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) +{ + struct input_keymap_entry ke = { + .len = sizeof(unsigned int), + .flags = 0, + }; + int __user *ip = (int __user *)p; + + if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) + return -EFAULT; + + if (get_user(ke.keycode, ip + 1)) + return -EFAULT; + + return input_set_keycode(dev, &ke); +} + +static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) +{ + struct input_keymap_entry ke; + + if (copy_from_user(&ke, p, sizeof(ke))) + return -EFAULT; + + if (ke.len > sizeof(ke.scancode)) return -EINVAL; - if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) - return -EAGAIN; + return input_set_keycode(dev, &ke); +} - retval = wait_event_interruptible(list->evdev->wait, - list->head != list->tail || (!list->evdev->exist)); +/* + * If we transfer state to the user, we should flush all pending events + * of the same type from the client's queue. Otherwise, they might end up + * with duplicate events, which can screw up client's state tracking. + * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED + * event so user-space will notice missing events. + * + * LOCKING: + * We need to take event_lock before buffer_lock to avoid dead-locks. But we + * need the even_lock only to guarantee consistent state. We can safely release + * it while flushing the queue. This allows input-core to handle filters while + * we flush the queue. + */ +static int evdev_handle_get_val(struct evdev_client *client, + struct input_dev *dev, unsigned int type, + unsigned long *bits, unsigned int max, + unsigned int size, void __user *p, int compat) +{ + int ret; + unsigned long *mem; - if (retval) - return retval; + mem = kmalloc(sizeof(unsigned long) * max, GFP_KERNEL); + if (!mem) + return -ENOMEM; + + spin_lock_irq(&dev->event_lock); + spin_lock(&client->buffer_lock); + + memcpy(mem, bits, sizeof(unsigned long) * max); + + spin_unlock(&dev->event_lock); - if (!list->evdev->exist) - return -ENODEV; + __evdev_flush_queue(client, type); - while (list->head != list->tail && retval + sizeof(struct input_event) <= count) { - if (copy_to_user(buffer + retval, list->buffer + list->tail, - sizeof(struct input_event))) return -EFAULT; - list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); - retval += sizeof(struct input_event); + spin_unlock_irq(&client->buffer_lock); + + ret = bits_to_user(mem, max, size, p, compat); + if (ret < 0) + evdev_queue_syn_dropped(client); + + kfree(mem); + + return ret; +} + +static int evdev_handle_mt_request(struct input_dev *dev, + unsigned int size, + int __user *ip) +{ + const struct input_mt *mt = dev->mt; + unsigned int code; + int max_slots; + int i; + + if (get_user(code, &ip[0])) + return -EFAULT; + if (!mt || !input_is_mt_value(code)) + return -EINVAL; + + max_slots = (size - sizeof(__u32)) / sizeof(__s32); + for (i = 0; i < mt->num_slots && i < max_slots; i++) { + int value = input_mt_get_value(&mt->slots[i], code); + if (put_user(value, &ip[1 + i])) + return -EFAULT; } - return retval; + return 0; } -/* No kernel lock - fine */ -static unsigned int evdev_poll(struct file *file, poll_table *wait) +static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, + struct file *file) { - struct evdev_list *list = file->private_data; - poll_wait(file, &list->evdev->wait, wait); - return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | - (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); + client->revoked = true; + evdev_ungrab(evdev, client); + input_flush_device(&evdev->handle, file); + wake_up_interruptible(&evdev->wait); + + return 0; } -static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +static long evdev_do_ioctl(struct file *file, unsigned int cmd, + void __user *p, int compat_mode) { - struct evdev_list *list = file->private_data; - struct evdev *evdev = list->evdev; + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; struct input_dev *dev = evdev->handle.dev; struct input_absinfo abs; - void __user *p = (void __user *)arg; - int __user *ip = (int __user *)arg; - int i, t, u, v; - - if (!evdev->exist) return -ENODEV; + struct ff_effect effect; + int __user *ip = (int __user *)p; + unsigned int i, t, u, v; + unsigned int size; + int error; + /* First we check for fixed-length commands */ switch (cmd) { - case EVIOCGVERSION: - return put_user(EV_VERSION, ip); + case EVIOCGVERSION: + return put_user(EV_VERSION, ip); - case EVIOCGID: - return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0; + case EVIOCGID: + if (copy_to_user(p, &dev->id, sizeof(struct input_id))) + return -EFAULT; + return 0; - case EVIOCGKEYCODE: - if (get_user(t, ip)) return -EFAULT; - if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; - if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT; - return 0; + case EVIOCGREP: + if (!test_bit(EV_REP, dev->evbit)) + return -ENOSYS; + if (put_user(dev->rep[REP_DELAY], ip)) + return -EFAULT; + if (put_user(dev->rep[REP_PERIOD], ip + 1)) + return -EFAULT; + return 0; - case EVIOCSKEYCODE: - if (get_user(t, ip)) return -EFAULT; - if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; - if (get_user(v, ip + 1)) return -EFAULT; - if (v < 0 || v > KEY_MAX) return -EINVAL; - if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) return -EINVAL; - u = SET_INPUT_KEYCODE(dev, t, v); - clear_bit(u, dev->keybit); - set_bit(v, dev->keybit); - for (i = 0; i < dev->keycodemax; i++) - if (INPUT_KEYCODE(dev,i) == u) - set_bit(u, dev->keybit); - return 0; + case EVIOCSREP: + if (!test_bit(EV_REP, dev->evbit)) + return -ENOSYS; + if (get_user(u, ip)) + return -EFAULT; + if (get_user(v, ip + 1)) + return -EFAULT; - case EVIOCSFF: - if (dev->upload_effect) { - struct ff_effect effect; - int err; - - if (copy_from_user(&effect, p, sizeof(effect))) - return -EFAULT; - err = dev->upload_effect(dev, &effect); - if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id))) - return -EFAULT; - return err; - } - else return -ENOSYS; - - case EVIOCRMFF: - if (dev->erase_effect) { - return dev->erase_effect(dev, (int)arg); - } - else return -ENOSYS; - - case EVIOCGEFFECTS: - if (put_user(dev->ff_effects_max, ip)) - return -EFAULT; - return 0; + input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); + input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); - case EVIOCGRAB: - if (arg) { - if (evdev->grab) - return -EBUSY; - if (input_grab_device(&evdev->handle)) - return -EBUSY; - evdev->grab = list; - return 0; - } else { - if (evdev->grab != list) - return -EINVAL; - input_release_device(&evdev->handle); - evdev->grab = NULL; - return 0; - } - - default: - - if (_IOC_TYPE(cmd) != 'E') - return -EINVAL; + return 0; + + case EVIOCRMFF: + return input_ff_erase(dev, (int)(unsigned long) p, file); + + case EVIOCGEFFECTS: + i = test_bit(EV_FF, dev->evbit) ? + dev->ff->max_effects : 0; + if (put_user(i, ip)) + return -EFAULT; + return 0; + + case EVIOCGRAB: + if (p) + return evdev_grab(evdev, client); + else + return evdev_ungrab(evdev, client); + + case EVIOCREVOKE: + if (p) + return -EINVAL; + else + return evdev_revoke(evdev, client, file); + + case EVIOCSCLOCKID: + if (copy_from_user(&i, p, sizeof(unsigned int))) + return -EFAULT; + if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) + return -EINVAL; + client->clkid = i; + return 0; + + case EVIOCGKEYCODE: + return evdev_handle_get_keycode(dev, p); + + case EVIOCSKEYCODE: + return evdev_handle_set_keycode(dev, p); + + case EVIOCGKEYCODE_V2: + return evdev_handle_get_keycode_v2(dev, p); - if (_IOC_DIR(cmd) == _IOC_READ) { - - if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { - - long *bits; - int len; - - switch (_IOC_NR(cmd) & EV_MAX) { - case 0: bits = dev->evbit; len = EV_MAX; break; - case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; - case EV_REL: bits = dev->relbit; len = REL_MAX; break; - case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; - case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; - case EV_LED: bits = dev->ledbit; len = LED_MAX; break; - case EV_SND: bits = dev->sndbit; len = SND_MAX; break; - case EV_FF: bits = dev->ffbit; len = FF_MAX; break; - case EV_SW: bits = dev->swbit; len = SW_MAX; break; - default: return -EINVAL; - } - len = NBITS(len) * sizeof(long); - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, bits, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) { - int len; - len = NBITS(KEY_MAX) * sizeof(long); - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->key, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) { - int len; - len = NBITS(LED_MAX) * sizeof(long); - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->led, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) { - int len; - len = NBITS(SND_MAX) * sizeof(long); - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->snd, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) { - int len; - len = NBITS(SW_MAX) * sizeof(long); - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->sw, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { - int len; - if (!dev->name) return -ENOENT; - len = strlen(dev->name) + 1; - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->name, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { - int len; - if (!dev->phys) return -ENOENT; - len = strlen(dev->phys) + 1; - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->phys, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { - int len; - if (!dev->uniq) return -ENOENT; - len = strlen(dev->uniq) + 1; - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; - } - - if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { - - int t = _IOC_NR(cmd) & ABS_MAX; - - abs.value = dev->abs[t]; - abs.minimum = dev->absmin[t]; - abs.maximum = dev->absmax[t]; - abs.fuzz = dev->absfuzz[t]; - abs.flat = dev->absflat[t]; - - if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) - return -EFAULT; - - return 0; - } - - } - - if (_IOC_DIR(cmd) == _IOC_WRITE) { - - if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { - - int t = _IOC_NR(cmd) & ABS_MAX; - - if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) - return -EFAULT; - - dev->abs[t] = abs.value; - dev->absmin[t] = abs.minimum; - dev->absmax[t] = abs.maximum; - dev->absfuzz[t] = abs.fuzz; - dev->absflat[t] = abs.flat; - - return 0; - } - } + case EVIOCSKEYCODE_V2: + return evdev_handle_set_keycode_v2(dev, p); } - return -EINVAL; -} -#ifdef CONFIG_COMPAT + size = _IOC_SIZE(cmd); -#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) -#define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1) -#define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT) -#define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x)) -#define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT) -#define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1) + /* Now check variable-length commands */ +#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) + switch (EVIOC_MASK_SIZE(cmd)) { -#ifdef __BIG_ENDIAN -#define bit_to_user(bit, max) \ -do { \ - int i; \ - int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ - for (i = 0; i < len / sizeof(compat_long_t); i++) \ - if (copy_to_user((compat_long_t __user *) p + i, \ - (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \ - sizeof(compat_long_t))) \ - return -EFAULT; \ - return len; \ -} while (0) -#else -#define bit_to_user(bit, max) \ -do { \ - int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ - return copy_to_user(p, (bit), len) ? -EFAULT : len; \ -} while (0) -#endif + case EVIOCGPROP(0): + return bits_to_user(dev->propbit, INPUT_PROP_MAX, + size, p, compat_mode); -static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) -{ - struct evdev_list *list = file->private_data; - struct evdev *evdev = list->evdev; - struct input_dev *dev = evdev->handle.dev; - struct input_absinfo abs; - void __user *p = compat_ptr(arg); + case EVIOCGMTSLOTS(0): + return evdev_handle_mt_request(dev, size, ip); - if (!evdev->exist) return -ENODEV; + case EVIOCGKEY(0): + return evdev_handle_get_val(client, dev, EV_KEY, dev->key, + KEY_MAX, size, p, compat_mode); - switch (cmd) { + case EVIOCGLED(0): + return evdev_handle_get_val(client, dev, EV_LED, dev->led, + LED_MAX, size, p, compat_mode); - case EVIOCGVERSION: - case EVIOCGID: - case EVIOCGKEYCODE: - case EVIOCSKEYCODE: - case EVIOCSFF: - case EVIOCRMFF: - case EVIOCGEFFECTS: - case EVIOCGRAB: - return evdev_ioctl(file, cmd, (unsigned long) p); + case EVIOCGSND(0): + return evdev_handle_get_val(client, dev, EV_SND, dev->snd, + SND_MAX, size, p, compat_mode); + + case EVIOCGSW(0): + return evdev_handle_get_val(client, dev, EV_SW, dev->sw, + SW_MAX, size, p, compat_mode); + + case EVIOCGNAME(0): + return str_to_user(dev->name, size, p); + + case EVIOCGPHYS(0): + return str_to_user(dev->phys, size, p); + + case EVIOCGUNIQ(0): + return str_to_user(dev->uniq, size, p); + + case EVIOC_MASK_SIZE(EVIOCSFF): + if (input_ff_effect_from_user(p, size, &effect)) + return -EFAULT; - default: + error = input_ff_upload(dev, &effect, file); + if (error) + return error; - if (_IOC_TYPE(cmd) != 'E') + if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) + return -EFAULT; + + return 0; + } + + /* Multi-number variable-length handlers */ + if (_IOC_TYPE(cmd) != 'E') + return -EINVAL; + + if (_IOC_DIR(cmd) == _IOC_READ) { + + if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) + return handle_eviocgbit(dev, + _IOC_NR(cmd) & EV_MAX, size, + p, compat_mode); + + if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { + + if (!dev->absinfo) return -EINVAL; - if (_IOC_DIR(cmd) == _IOC_READ) { - - if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { - long *bits; - int max; - - switch (_IOC_NR(cmd) & EV_MAX) { - case 0: bits = dev->evbit; max = EV_MAX; break; - case EV_KEY: bits = dev->keybit; max = KEY_MAX; break; - case EV_REL: bits = dev->relbit; max = REL_MAX; break; - case EV_ABS: bits = dev->absbit; max = ABS_MAX; break; - case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break; - case EV_LED: bits = dev->ledbit; max = LED_MAX; break; - case EV_SND: bits = dev->sndbit; max = SND_MAX; break; - case EV_FF: bits = dev->ffbit; max = FF_MAX; break; - case EV_SW: bits = dev->swbit; max = SW_MAX; break; - default: return -EINVAL; - } - bit_to_user(bits, max); - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) - bit_to_user(dev->key, KEY_MAX); - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) - bit_to_user(dev->led, LED_MAX); - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) - bit_to_user(dev->snd, SND_MAX); - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) - bit_to_user(dev->sw, SW_MAX); - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { - int len; - if (!dev->name) return -ENOENT; - len = strlen(dev->name) + 1; - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->name, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { - int len; - if (!dev->phys) return -ENOENT; - len = strlen(dev->phys) + 1; - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->phys, len) ? -EFAULT : len; - } - - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { - int len; - if (!dev->uniq) return -ENOENT; - len = strlen(dev->uniq) + 1; - if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); - return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; - } - - if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { - - int t = _IOC_NR(cmd) & ABS_MAX; - - abs.value = dev->abs[t]; - abs.minimum = dev->absmin[t]; - abs.maximum = dev->absmax[t]; - abs.fuzz = dev->absfuzz[t]; - abs.flat = dev->absflat[t]; - - if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) - return -EFAULT; - - return 0; - } - } - - if (_IOC_DIR(cmd) == _IOC_WRITE) { - - if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { - - int t = _IOC_NR(cmd) & ABS_MAX; - - if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) - return -EFAULT; - - dev->abs[t] = abs.value; - dev->absmin[t] = abs.minimum; - dev->absmax[t] = abs.maximum; - dev->absfuzz[t] = abs.fuzz; - dev->absflat[t] = abs.flat; - - return 0; - } - } + t = _IOC_NR(cmd) & ABS_MAX; + abs = dev->absinfo[t]; + + if (copy_to_user(p, &abs, min_t(size_t, + size, sizeof(struct input_absinfo)))) + return -EFAULT; + + return 0; + } + } + + if (_IOC_DIR(cmd) == _IOC_WRITE) { + + if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { + + if (!dev->absinfo) + return -EINVAL; + + t = _IOC_NR(cmd) & ABS_MAX; + + if (copy_from_user(&abs, p, min_t(size_t, + size, sizeof(struct input_absinfo)))) + return -EFAULT; + + if (size < sizeof(struct input_absinfo)) + abs.resolution = 0; + + /* We can't change number of reserved MT slots */ + if (t == ABS_MT_SLOT) + return -EINVAL; + + /* + * Take event lock to ensure that we are not + * changing device parameters in the middle + * of event. + */ + spin_lock_irq(&dev->event_lock); + dev->absinfo[t] = abs; + spin_unlock_irq(&dev->event_lock); + + return 0; + } } + return -EINVAL; } + +static long evdev_ioctl_handler(struct file *file, unsigned int cmd, + void __user *p, int compat_mode) +{ + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; + int retval; + + retval = mutex_lock_interruptible(&evdev->mutex); + if (retval) + return retval; + + if (!evdev->exist || client->revoked) { + retval = -ENODEV; + goto out; + } + + retval = evdev_do_ioctl(file, cmd, p, compat_mode); + + out: + mutex_unlock(&evdev->mutex); + return retval; +} + +static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); +} + +#ifdef CONFIG_COMPAT +static long evdev_ioctl_compat(struct file *file, + unsigned int cmd, unsigned long arg) +{ + return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); +} #endif -static struct file_operations evdev_fops = { - .owner = THIS_MODULE, - .read = evdev_read, - .write = evdev_write, - .poll = evdev_poll, - .open = evdev_open, - .release = evdev_release, - .unlocked_ioctl = evdev_ioctl, +static const struct file_operations evdev_fops = { + .owner = THIS_MODULE, + .read = evdev_read, + .write = evdev_write, + .poll = evdev_poll, + .open = evdev_open, + .release = evdev_release, + .unlocked_ioctl = evdev_ioctl, #ifdef CONFIG_COMPAT - .compat_ioctl = evdev_ioctl_compat, + .compat_ioctl = evdev_ioctl_compat, #endif - .fasync = evdev_fasync, - .flush = evdev_flush + .fasync = evdev_fasync, + .flush = evdev_flush, + .llseek = no_llseek, }; -static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) +/* + * Mark device non-existent. This disables writes, ioctls and + * prevents new users from opening the device. Already posted + * blocking reads will stay, however new ones will fail. + */ +static void evdev_mark_dead(struct evdev *evdev) +{ + mutex_lock(&evdev->mutex); + evdev->exist = false; + mutex_unlock(&evdev->mutex); +} + +static void evdev_cleanup(struct evdev *evdev) +{ + struct input_handle *handle = &evdev->handle; + + evdev_mark_dead(evdev); + evdev_hangup(evdev); + + cdev_del(&evdev->cdev); + + /* evdev is marked dead so no one else accesses evdev->open */ + if (evdev->open) { + input_flush_device(handle, NULL); + input_close_device(handle); + } +} + +/* + * Create new evdev device. Note that input core serializes calls + * to connect and disconnect. + */ +static int evdev_connect(struct input_handler *handler, struct input_dev *dev, + const struct input_device_id *id) { struct evdev *evdev; - struct class_device *cdev; int minor; - - for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); - if (minor == EVDEV_MINORS) { - printk(KERN_ERR "evdev: no more free evdev devices\n"); - return NULL; + int dev_no; + int error; + + minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); + if (minor < 0) { + error = minor; + pr_err("failed to reserve new minor: %d\n", error); + return error; } - if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL))) - return NULL; - memset(evdev, 0, sizeof(struct evdev)); + evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); + if (!evdev) { + error = -ENOMEM; + goto err_free_minor; + } - INIT_LIST_HEAD(&evdev->list); + INIT_LIST_HEAD(&evdev->client_list); + spin_lock_init(&evdev->client_lock); + mutex_init(&evdev->mutex); init_waitqueue_head(&evdev->wait); + evdev->exist = true; + + dev_no = minor; + /* Normalize device number if it falls into legacy range */ + if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) + dev_no -= EVDEV_MINOR_BASE; + dev_set_name(&evdev->dev, "event%d", dev_no); - evdev->exist = 1; - evdev->minor = minor; - evdev->handle.dev = dev; - evdev->handle.name = evdev->name; + evdev->handle.dev = input_get_device(dev); + evdev->handle.name = dev_name(&evdev->dev); evdev->handle.handler = handler; evdev->handle.private = evdev; - sprintf(evdev->name, "event%d", minor); - evdev_table[minor] = evdev; + evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); + evdev->dev.class = &input_class; + evdev->dev.parent = &dev->dev; + evdev->dev.release = evdev_free; + device_initialize(&evdev->dev); - cdev = class_device_create(&input_class, &dev->cdev, - MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), - dev->cdev.dev, evdev->name); + error = input_register_handle(&evdev->handle); + if (error) + goto err_free_evdev; - /* temporary symlink to keep userspace happy */ - sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, - evdev->name); + cdev_init(&evdev->cdev, &evdev_fops); + evdev->cdev.kobj.parent = &evdev->dev.kobj; + error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); + if (error) + goto err_unregister_handle; + + error = device_add(&evdev->dev); + if (error) + goto err_cleanup_evdev; + + return 0; - return &evdev->handle; + err_cleanup_evdev: + evdev_cleanup(evdev); + err_unregister_handle: + input_unregister_handle(&evdev->handle); + err_free_evdev: + put_device(&evdev->dev); + err_free_minor: + input_free_minor(minor); + return error; } static void evdev_disconnect(struct input_handle *handle) { struct evdev *evdev = handle->private; - struct evdev_list *list; - sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name); - class_device_destroy(&input_class, - MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor)); - evdev->exist = 0; - - if (evdev->open) { - input_close_device(handle); - wake_up_interruptible(&evdev->wait); - list_for_each_entry(list, &evdev->list, node) - kill_fasync(&list->fasync, SIGIO, POLL_HUP); - } else - evdev_free(evdev); + device_del(&evdev->dev); + evdev_cleanup(evdev); + input_free_minor(MINOR(evdev->dev.devt)); + input_unregister_handle(handle); + put_device(&evdev->dev); } -static struct input_device_id evdev_ids[] = { +static const struct input_device_id evdev_ids[] = { { .driver_info = 1 }, /* Matches all devices */ { }, /* Terminating zero entry */ }; @@ -729,19 +1182,19 @@ static struct input_device_id evdev_ids[] = { MODULE_DEVICE_TABLE(input, evdev_ids); static struct input_handler evdev_handler = { - .event = evdev_event, - .connect = evdev_connect, - .disconnect = evdev_disconnect, - .fops = &evdev_fops, - .minor = EVDEV_MINOR_BASE, - .name = "evdev", - .id_table = evdev_ids, + .event = evdev_event, + .events = evdev_events, + .connect = evdev_connect, + .disconnect = evdev_disconnect, + .legacy_minors = true, + .minor = EVDEV_MINOR_BASE, + .name = "evdev", + .id_table = evdev_ids, }; static int __init evdev_init(void) { - input_register_handler(&evdev_handler); - return 0; + return input_register_handler(&evdev_handler); } static void __exit evdev_exit(void) |