diff options
Diffstat (limited to 'drivers/input/evdev.c')
| -rw-r--r-- | drivers/input/evdev.c | 1286 |
1 files changed, 902 insertions, 384 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 745979f33dc..fd325ec9f06 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -8,308 +8,554 @@ * 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) { - struct evdev *evdev = handle->private; - struct evdev_list *list; + unsigned long flags; + struct input_event ev; + ktime_t time; - if (evdev->grab) { - list = evdev->grab; + time = ktime_get(); + if (client->clkid != CLOCK_MONOTONIC) + time = ktime_sub(time, 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); + ev.time = ktime_to_timeval(time); + ev.type = EV_SYN; + ev.code = SYN_DROPPED; + ev.value = 0; - kill_fasync(&list->fasync, SIGIO, POLL_IN); - } else - list_for_each_entry(list, &evdev->list, node) { + spin_lock_irqsave(&client->buffer_lock, flags); - 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); + client->buffer[client->head++] = ev; + client->head &= client->bufsize - 1; - kill_fasync(&list->fasync, SIGIO, POLL_IN); - } + 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; + } - wake_up_interruptible(&evdev->wait); + spin_unlock_irqrestore(&client->buffer_lock, flags); } -static int evdev_fasync(int fd, struct file *file, int on) +static void __pass_event(struct evdev_client *client, + const struct input_event *event) { - int retval; - struct evdev_list *list = file->private_data; - retval = fasync_helper(fd, file, on, &list->fasync); - return retval < 0 ? retval : 0; + 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 int evdev_flush(struct file * file) +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_list *list = file->private_data; - if (!list->evdev->exist) return -ENODEV; - return input_flush_device(&list->evdev->handle, file); + 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); } -static void evdev_free(struct evdev *evdev) +/* + * Pass incoming events to all connected clients. + */ +static void evdev_events(struct input_handle *handle, + const struct input_value *vals, unsigned int count) { - evdev_table[evdev->minor] = NULL; - kfree(evdev); + struct evdev *evdev = handle->private; + struct evdev_client *client; + ktime_t time_mono, time_real; + + time_mono = ktime_get(); + time_real = ktime_sub(time_mono, ktime_get_monotonic_offset()); + + rcu_read_lock(); + + client = rcu_dereference(evdev->grab); + + 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); + + rcu_read_unlock(); } -static int evdev_release(struct inode * inode, struct file * file) +/* + * Pass incoming event to all connected clients. + */ +static void evdev_event(struct input_handle *handle, + unsigned int type, unsigned int code, int value) { - struct evdev_list *list = file->private_data; + struct input_value vals[] = { { type, code, value } }; - if (list->evdev->grab == list) { - input_release_device(&list->evdev->handle); - list->evdev->grab = NULL; - } + evdev_events(handle, vals, 1); +} - evdev_fasync(-1, file, 0); - list_del(&list->node); +static int evdev_fasync(int fd, struct file *file, int on) +{ + struct evdev_client *client = file->private_data; - if (!--list->evdev->open) { - if (list->evdev->exist) - input_close_device(&list->evdev->handle); - else - evdev_free(list->evdev); - } + return fasync_helper(fd, file, on, &client->fasync); +} - kfree(list); - return 0; +static int evdev_flush(struct file *file, fl_owner_t id) +{ + 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 int evdev_open(struct inode * inode, struct file * file) +static void evdev_free(struct device *dev) { - struct evdev_list *list; - int i = iminor(inode) - EVDEV_MINOR_BASE; - int accept_err; + struct evdev *evdev = container_of(dev, struct evdev, dev); - if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) - return -ENODEV; + input_put_device(evdev->handle.dev); + kfree(evdev); +} - if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) - return accept_err; +/* + * 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) +{ + int error; - if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL))) - return -ENOMEM; - memset(list, 0, sizeof(struct evdev_list)); + if (evdev->grab) + return -EBUSY; - list->evdev = evdev_table[i]; - list_add_tail(&list->node, &evdev_table[i]->list); - file->private_data = list; + error = input_grab_device(&evdev->handle); + if (error) + return error; - if (!list->evdev->open++) - if (list->evdev->exist) - input_open_device(&list->evdev->handle); + rcu_assign_pointer(evdev->grab, client); return 0; } -#ifdef CONFIG_COMPAT +static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) +{ + struct evdev_client *grab = rcu_dereference_protected(evdev->grab, + lockdep_is_held(&evdev->mutex)); -struct input_event_compat { - struct compat_timeval time; - __u16 type; - __u16 code; - __s32 value; -}; + if (grab != client) + return -EINVAL; -/* Note to the author of this code: did it ever occur to - you why the ifdefs are needed? Think about it again. -AK */ -#ifdef CONFIG_X86_64 -# define COMPAT_TEST is_compat_task() -#elif defined(CONFIG_IA64) -# define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current)) -#elif defined(CONFIG_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 + rcu_assign_pointer(evdev->grab, NULL); + synchronize_rcu(); + input_release_device(&evdev->handle); -static inline size_t evdev_event_size(void) + return 0; +} + +static void evdev_attach_client(struct evdev *evdev, + struct evdev_client *client) { - return COMPAT_TEST ? - sizeof(struct input_event_compat) : sizeof(struct input_event); + spin_lock(&evdev->client_lock); + list_add_tail_rcu(&client->node, &evdev->client_list); + spin_unlock(&evdev->client_lock); } -static int evdev_event_from_user(const char __user *buffer, struct input_event *event) +static void evdev_detach_client(struct evdev *evdev, + struct evdev_client *client) { - if (COMPAT_TEST) { - struct input_event_compat compat_event; + spin_lock(&evdev->client_lock); + list_del_rcu(&client->node); + spin_unlock(&evdev->client_lock); + synchronize_rcu(); +} - if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat))) - return -EFAULT; +static int evdev_open_device(struct evdev *evdev) +{ + int retval; - event->time.tv_sec = compat_event.time.tv_sec; - event->time.tv_usec = compat_event.time.tv_usec; - event->type = compat_event.type; - event->code = compat_event.code; - event->value = compat_event.value; + retval = mutex_lock_interruptible(&evdev->mutex); + if (retval) + return retval; - } else { - if (copy_from_user(event, buffer, sizeof(struct input_event))) - return -EFAULT; + if (!evdev->exist) + retval = -ENODEV; + else if (!evdev->open++) { + retval = input_open_device(&evdev->handle); + if (retval) + evdev->open--; } - return 0; + mutex_unlock(&evdev->mutex); + return retval; } -static int evdev_event_to_user(char __user *buffer, const struct input_event *event) +static void evdev_close_device(struct evdev *evdev) { - if (COMPAT_TEST) { - struct input_event_compat compat_event; + mutex_lock(&evdev->mutex); - compat_event.time.tv_sec = event->time.tv_sec; - compat_event.time.tv_usec = event->time.tv_usec; - compat_event.type = event->type; - compat_event.code = event->code; - compat_event.value = event->value; + if (evdev->exist && !--evdev->open) + input_close_device(&evdev->handle); - if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat))) - return -EFAULT; + mutex_unlock(&evdev->mutex); +} - } else { - if (copy_to_user(buffer, event, sizeof(struct input_event))) - return -EFAULT; - } +/* + * Wake up users waiting for IO so they can disconnect from + * dead device. + */ +static void evdev_hangup(struct evdev *evdev) +{ + struct evdev_client *client; - return 0; -} + 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); -#else + wake_up_interruptible(&evdev->wait); +} -static inline size_t evdev_event_size(void) +static int evdev_release(struct inode *inode, struct file *file) { - return sizeof(struct input_event); + 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); + + if (is_vmalloc_addr(client)) + vfree(client); + else + kfree(client); + + evdev_close_device(evdev); + + return 0; } -static int evdev_event_from_user(const char __user *buffer, struct input_event *event) +static unsigned int evdev_compute_buffer_size(struct input_dev *dev) { - if (copy_from_user(event, buffer, sizeof(struct input_event))) - return -EFAULT; + unsigned int n_events = + max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, + EVDEV_MIN_BUFFER_SIZE); - return 0; + return roundup_pow_of_two(n_events); } -static int evdev_event_to_user(char __user *buffer, const struct input_event *event) +static int evdev_open(struct inode *inode, struct file *file) { - if (copy_to_user(buffer, event, sizeof(struct input_event))) - return -EFAULT; + 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; -} -#endif /* CONFIG_COMPAT */ + 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) +static ssize_t evdev_write(struct file *file, const 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; - if (!list->evdev->exist) - return -ENODEV; + if (count != 0 && count < input_event_size()) + return -EINVAL; - while (retval < count) { + retval = mutex_lock_interruptible(&evdev->mutex); + if (retval) + return retval; - if (evdev_event_from_user(buffer + retval, &event)) - return -EFAULT; - input_event(list->evdev->handle.dev, event.type, event.code, event.value); - retval += evdev_event_size(); + 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; } -static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) +static int evdev_fetch_next_event(struct evdev_client *client, + struct input_event *event) { - struct evdev_list *list = file->private_data; - int retval; + 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_client *client = file->private_data; + struct evdev *evdev = client->evdev; + struct input_event event; + size_t read = 0; + int error; - if (count < evdev_event_size()) + if (count != 0 && count < input_event_size()) return -EINVAL; - if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) - return -EAGAIN; + for (;;) { + if (!evdev->exist || client->revoked) + return -ENODEV; - retval = wait_event_interruptible(list->evdev->wait, - list->head != list->tail || (!list->evdev->exist)); + if (client->packet_head == client->tail && + (file->f_flags & O_NONBLOCK)) + return -EAGAIN; - if (retval) - return retval; + /* + * count == 0 is special - no IO is done but we check + * for error conditions (see above). + */ + if (count == 0) + break; - if (!list->evdev->exist) - return -ENODEV; + while (read + input_event_size() <= count && + evdev_fetch_next_event(client, &event)) { - while (list->head != list->tail && retval + evdev_event_size() <= count) { + if (input_event_to_user(buffer + read, &event)) + return -EFAULT; - struct input_event *event = (struct input_event *) list->buffer + list->tail; + read += input_event_size(); + } - if (evdev_event_to_user(buffer + retval, event)) - return -EFAULT; + if (read) + break; - list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); - retval += evdev_event_size(); + 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 retval; + return read; } /* No kernel lock - fine */ static unsigned int evdev_poll(struct file *file, poll_table *wait) { - 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)); + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; + unsigned int mask; + + poll_wait(file, &evdev->wait, wait); + + 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 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) -#define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) +#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) #ifdef __BIG_ENDIAN static int bits_to_user(unsigned long *bits, unsigned int maxbit, @@ -318,8 +564,8 @@ static int bits_to_user(unsigned long *bits, unsigned int maxbit, int len, i; if (compat) { - len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t); - if (len < maxlen) + 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++) @@ -329,7 +575,7 @@ static int bits_to_user(unsigned long *bits, unsigned int maxbit, sizeof(compat_long_t))) return -EFAULT; } else { - len = NBITS(maxbit) * sizeof(long); + len = BITS_TO_LONGS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; @@ -344,8 +590,8 @@ static int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat) { int len = compat ? - NBITS_COMPAT(maxbit) * sizeof(compat_long_t) : - NBITS(maxbit) * sizeof(long); + BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : + BITS_TO_LONGS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; @@ -359,7 +605,7 @@ static int bits_to_user(unsigned long *bits, unsigned int maxbit, static int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat) { - int len = NBITS(maxbit) * sizeof(long); + int len = BITS_TO_LONGS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; @@ -383,280 +629,552 @@ static int str_to_user(const char *str, unsigned int maxlen, void __user *p) return copy_to_user(p, str, len) ? -EFAULT : len; } -static long evdev_ioctl_handler(struct file *file, unsigned int cmd, - void __user *p, int compat_mode) +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 bits_to_user(bits, len, size, p, compat_mode); +} + +static int evdev_handle_get_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; + int error; + + /* legacy case */ + if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) + return -EFAULT; + + 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; + + return input_set_keycode(dev, &ke); +} + +/* + * 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) { - struct evdev_list *list = file->private_data; - struct evdev *evdev = list->evdev; + int ret; + unsigned long *mem; + + 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); + + __evdev_flush_queue(client, type); + + 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 0; +} + +static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, + struct file *file) +{ + client->revoked = true; + evdev_ungrab(evdev, client); + input_flush_device(&evdev->handle, file); + wake_up_interruptible(&evdev->wait); + + return 0; +} + +static long evdev_do_ioctl(struct file *file, unsigned int cmd, + void __user *p, int compat_mode) +{ + struct evdev_client *client = file->private_data; + struct evdev *evdev = client->evdev; struct input_dev *dev = evdev->handle.dev; struct input_absinfo abs; + struct ff_effect effect; int __user *ip = (int __user *)p; - int i, t, u, v; - - if (!evdev->exist) - return -ENODEV; + 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: - if (copy_to_user(p, &dev->id, sizeof(struct input_id))) - return -EFAULT; + case EVIOCGID: + if (copy_to_user(p, &dev->id, sizeof(struct input_id))) + return -EFAULT; + return 0; - 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 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 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 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; + input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); + input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); - 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; - return 0; + case EVIOCRMFF: + return input_ff_erase(dev, (int)(unsigned long) p, file); - case EVIOCSFF: - if (dev->upload_effect) { - struct ff_effect effect; - int err; + case EVIOCGEFFECTS: + i = test_bit(EV_FF, dev->evbit) ? + dev->ff->max_effects : 0; + if (put_user(i, ip)) + return -EFAULT; + return 0; - 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 *)p)->id))) - return -EFAULT; - return err; - } else - return -ENOSYS; + case EVIOCGRAB: + if (p) + return evdev_grab(evdev, client); + else + return evdev_ungrab(evdev, client); - case EVIOCRMFF: - if (!dev->erase_effect) - return -ENOSYS; + case EVIOCREVOKE: + if (p) + return -EINVAL; + else + return evdev_revoke(evdev, client, file); - return dev->erase_effect(dev, (int)(unsigned long) p); + 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 EVIOCGEFFECTS: - if (put_user(dev->ff_effects_max, ip)) - return -EFAULT; - return 0; + case EVIOCGKEYCODE: + return evdev_handle_get_keycode(dev, p); - case EVIOCGRAB: - if (p) { - 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; + case EVIOCSKEYCODE: + return evdev_handle_set_keycode(dev, p); - if (_IOC_DIR(cmd) == _IOC_READ) { + case EVIOCGKEYCODE_V2: + return evdev_handle_get_keycode_v2(dev, p); - if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { + case EVIOCSKEYCODE_V2: + return evdev_handle_set_keycode_v2(dev, p); + } + + size = _IOC_SIZE(cmd); - long *bits; - int len; + /* Now check variable-length commands */ +#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) + switch (EVIOC_MASK_SIZE(cmd)) { - 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; - } - return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); - } + case EVIOCGPROP(0): + return bits_to_user(dev->propbit, INPUT_PROP_MAX, + size, p, compat_mode); - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) - return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), - p, compat_mode); + case EVIOCGMTSLOTS(0): + return evdev_handle_mt_request(dev, size, ip); - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) - return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), - p, compat_mode); + case EVIOCGKEY(0): + return evdev_handle_get_val(client, dev, EV_KEY, dev->key, + KEY_MAX, size, p, compat_mode); - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) - return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), - p, compat_mode); + case EVIOCGLED(0): + return evdev_handle_get_val(client, dev, EV_LED, dev->led, + LED_MAX, size, p, compat_mode); - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) - return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), - p, compat_mode); + case EVIOCGSND(0): + return evdev_handle_get_val(client, dev, EV_SND, dev->snd, + SND_MAX, size, p, compat_mode); - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) - return str_to_user(dev->name, _IOC_SIZE(cmd), p); + case EVIOCGSW(0): + return evdev_handle_get_val(client, dev, EV_SW, dev->sw, + SW_MAX, size, p, compat_mode); - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) - return str_to_user(dev->phys, _IOC_SIZE(cmd), p); + case EVIOCGNAME(0): + return str_to_user(dev->name, size, p); - if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) - return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); + case EVIOCGPHYS(0): + return str_to_user(dev->phys, size, p); - if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { + case EVIOCGUNIQ(0): + return str_to_user(dev->uniq, size, p); - int t = _IOC_NR(cmd) & ABS_MAX; + case EVIOC_MASK_SIZE(EVIOCSFF): + if (input_ff_effect_from_user(p, size, &effect)) + return -EFAULT; - 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]; + error = input_ff_upload(dev, &effect, file); + if (error) + return error; + + if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) + return -EFAULT; - if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) - return -EFAULT; + return 0; + } - return 0; - } + /* Multi-number variable-length handlers */ + if (_IOC_TYPE(cmd) != 'E') + return -EINVAL; - } + if (_IOC_DIR(cmd) == _IOC_READ) { - if (_IOC_DIR(cmd) == _IOC_WRITE) { + 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(EVIOCSABS(0))) { + if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { - int t = _IOC_NR(cmd) & ABS_MAX; + if (!dev->absinfo) + return -EINVAL; - if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) - return -EFAULT; + t = _IOC_NR(cmd) & ABS_MAX; + abs = dev->absinfo[t]; - 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; + if (copy_to_user(p, &abs, min_t(size_t, + size, sizeof(struct input_absinfo)))) + return -EFAULT; - return 0; - } - } + 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) +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; - evdev->exist = 1; - evdev->minor = minor; - evdev->handle.dev = dev; - evdev->handle.name = evdev->name; + 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->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); + + error = input_register_handle(&evdev->handle); + if (error) + goto err_free_evdev; - cdev = class_device_create(&input_class, &dev->cdev, - MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), - dev->cdev.dev, 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; - /* temporary symlink to keep userspace happy */ - sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, - evdev->name); + error = device_add(&evdev->dev); + if (error) + goto err_cleanup_evdev; - return &evdev->handle; + return 0; + + 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 */ }; @@ -664,19 +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) |