#define EVDEV_BUFFER_SIZE 64
#include <linux/poll.h>
+#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/major.h>
-#include <linux/smp_lock.h>
#include <linux/device.h>
-#include <linux/devfs_fs_kernel.h>
-#include <linux/compat.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 *grab;
+ struct list_head client_list;
+ spinlock_t client_lock; /* protects client_list */
+ struct mutex mutex;
+ struct device dev;
};
-struct evdev_list {
+struct evdev_client {
struct input_event buffer[EVDEV_BUFFER_SIZE];
int head;
int tail;
+ spinlock_t buffer_lock; /* protects access to buffer, head and tail */
struct fasync_struct *fasync;
struct evdev *evdev;
struct list_head node;
};
static struct evdev *evdev_table[EVDEV_MINORS];
+static DEFINE_MUTEX(evdev_table_mutex);
-static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
+static void evdev_pass_event(struct evdev_client *client,
+ struct input_event *event)
{
- struct evdev *evdev = handle->private;
- struct evdev_list *list;
+ /*
+ * Interrupts are disabled, just acquire the lock
+ */
+ spin_lock(&client->buffer_lock);
+ client->buffer[client->head++] = *event;
+ client->head &= EVDEV_BUFFER_SIZE - 1;
+ spin_unlock(&client->buffer_lock);
+
+ kill_fasync(&client->fasync, SIGIO, POLL_IN);
+}
- if (evdev->grab) {
- list = evdev->grab;
+/*
+ * 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 *evdev = handle->private;
+ struct evdev_client *client;
+ struct input_event event;
- 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);
+ do_gettimeofday(&event.time);
+ event.type = type;
+ event.code = code;
+ event.value = value;
- kill_fasync(&list->fasync, SIGIO, POLL_IN);
- } else
- list_for_each_entry(list, &evdev->list, node) {
+ rcu_read_lock();
- 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 = rcu_dereference(evdev->grab);
+ if (client)
+ evdev_pass_event(client, &event);
+ else
+ list_for_each_entry_rcu(client, &evdev->client_list, node)
+ evdev_pass_event(client, &event);
- kill_fasync(&list->fasync, SIGIO, POLL_IN);
- }
+ rcu_read_unlock();
wake_up_interruptible(&evdev->wait);
}
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)
+ 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);
+ synchronize_rcu();
- 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;
+ if (evdev->grab != client)
+ return -EINVAL;
- if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
- return -ENODEV;
+ rcu_assign_pointer(evdev->grab, NULL);
+ synchronize_rcu();
+ input_release_device(&evdev->handle);
- if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
- return accept_err;
+ return 0;
+}
- if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
- return -ENOMEM;
- memset(list, 0, sizeof(struct evdev_list));
+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);
+ synchronize_rcu();
+}
+
+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();
+}
- list->evdev = evdev_table[i];
- list_add_tail(&list->node, &evdev_table[i]->list);
- file->private_data = list;
+static int evdev_open_device(struct evdev *evdev)
+{
+ int retval;
- if (!list->evdev->open++)
- if (list->evdev->exist)
- input_open_device(&list->evdev->handle);
+ retval = mutex_lock_interruptible(&evdev->mutex);
+ if (retval)
+ return retval;
- return 0;
+ 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;
}
-#ifdef CONFIG_COMPAT
-struct input_event_compat {
- struct compat_timeval time;
- __u16 type;
- __u16 code;
- __s32 value;
-};
+static void evdev_close_device(struct evdev *evdev)
+{
+ mutex_lock(&evdev->mutex);
-#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
+ if (evdev->exist && !--evdev->open)
+ input_close_device(&evdev->handle);
+
+ mutex_unlock(&evdev->mutex);
+}
-static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
+/*
+ * Wake up users waiting for IO so they can disconnect from
+ * dead device.
+ */
+static void evdev_hangup(struct evdev *evdev)
{
- struct evdev_list *list = file->private_data;
- struct input_event_compat event;
- int retval = 0;
+ struct evdev_client *client;
- 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);
+ 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);
+ if (evdev->grab == client)
+ evdev_ungrab(evdev, client);
+ mutex_unlock(&evdev->mutex);
+
+ evdev_detach_client(evdev, client);
+ kfree(client);
+
+ evdev_close_device(evdev);
+ put_device(&evdev->dev);
+
+ return 0;
+}
+
+static int evdev_open(struct inode *inode, struct file *file)
+{
+ struct evdev *evdev;
+ struct evdev_client *client;
+ int i = iminor(inode) - EVDEV_MINOR_BASE;
+ int error;
+
+ if (i >= EVDEV_MINORS)
+ return -ENODEV;
+
+ error = mutex_lock_interruptible(&evdev_table_mutex);
+ if (error)
+ return error;
+ evdev = evdev_table[i];
+ if (evdev)
+ get_device(&evdev->dev);
+ mutex_unlock(&evdev_table_mutex);
+
+ if (!evdev)
+ return -ENODEV;
+
+ client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
+ if (!client) {
+ error = -ENOMEM;
+ goto err_put_evdev;
}
- return retval;
+ 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;
+ return 0;
+
+ err_free_client:
+ evdev_detach_client(evdev, client);
+ kfree(client);
+ err_put_evdev:
+ put_device(&evdev->dev);
+ return error;
}
-#endif
-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;
+ int retval;
- if (!list->evdev->exist) return -ENODEV;
+ retval = mutex_lock_interruptible(&evdev->mutex);
+ if (retval)
+ return retval;
-#ifdef CONFIG_COMPAT
- if (COMPAT_TEST)
- return evdev_write_compat(file, buffer, count, ppos);
-#endif
+ if (!evdev->exist) {
+ retval = -ENODEV;
+ goto out;
+ }
while (retval < count) {
- if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
- return -EFAULT;
- input_event(list->evdev->handle.dev, event.type, event.code, event.value);
- retval += sizeof(struct input_event);
+ if (input_event_from_user(buffer + retval, &event)) {
+ retval = -EFAULT;
+ goto out;
+ }
+
+ input_inject_event(&evdev->handle,
+ event.type, event.code, event.value);
+ retval += input_event_size();
}
+ out:
+ mutex_unlock(&evdev->mutex);
return retval;
}
-#ifdef CONFIG_COMPAT
-static ssize_t evdev_read_compat(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)
+{
+ int have_event;
+
+ spin_lock_irq(&client->buffer_lock);
+
+ have_event = client->head != client->tail;
+ if (have_event) {
+ *event = client->buffer[client->tail++];
+ client->tail &= EVDEV_BUFFER_SIZE - 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;
- if (count < sizeof(struct input_event_compat))
+ if (count < input_event_size())
return -EINVAL;
- if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
+ if (client->head == client->tail && evdev->exist &&
+ (file->f_flags & O_NONBLOCK))
return -EAGAIN;
- retval = wait_event_interruptible(list->evdev->wait,
- list->head != list->tail || (!list->evdev->exist));
-
+ retval = wait_event_interruptible(evdev->wait,
+ client->head != client->tail || !evdev->exist);
if (retval)
return retval;
- if (!list->evdev->exist)
+ if (!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);
+ while (retval + input_event_size() <= count &&
+ evdev_fetch_next_event(client, &event)) {
+
+ if (input_event_to_user(buffer + retval, &event))
+ return -EFAULT;
+
+ retval += input_event_size();
}
return retval;
}
-#endif
-static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
+/* No kernel lock - fine */
+static unsigned int evdev_poll(struct file *file, poll_table *wait)
{
- struct evdev_list *list = file->private_data;
- int retval;
+ struct evdev_client *client = file->private_data;
+ struct evdev *evdev = client->evdev;
+
+ poll_wait(file, &evdev->wait, wait);
+ return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
+ (evdev->exist ? 0 : (POLLHUP | POLLERR));
+}
#ifdef CONFIG_COMPAT
- if (COMPAT_TEST)
- return evdev_read_compat(file, buffer, count, ppos);
-#endif
- if (count < sizeof(struct input_event))
- return -EINVAL;
+#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
+#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
- if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
- return -EAGAIN;
+#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;
- retval = wait_event_interruptible(list->evdev->wait,
- list->head != list->tail || (!list->evdev->exist));
+ if (copy_to_user(p, bits, len))
+ return -EFAULT;
+ }
- if (retval)
- 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 (!list->evdev->exist)
- return -ENODEV;
+ if (len > maxlen)
+ len = maxlen;
- 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);
- }
+ return copy_to_user(p, bits, len) ? -EFAULT : len;
+}
+#endif /* __BIG_ENDIAN */
- return retval;
+#else
+
+static int bits_to_user(unsigned long *bits, unsigned int maxbit,
+ unsigned int maxlen, void __user *p, int compat)
+{
+ int len = BITS_TO_LONGS(maxbit) * sizeof(long);
+
+ if (len > maxlen)
+ len = maxlen;
+
+ return copy_to_user(p, bits, len) ? -EFAULT : len;
}
-/* No kernel lock - fine */
-static unsigned int evdev_poll(struct file *file, poll_table *wait)
+#endif /* CONFIG_COMPAT */
+
+static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
{
- 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));
+ int len;
+
+ if (!str)
+ return -ENOENT;
+
+ len = strlen(str) + 1;
+ if (len > maxlen)
+ len = maxlen;
+
+ return copy_to_user(p, str, len) ? -EFAULT : len;
}
-static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+#define OLD_KEY_MAX 0x1ff
+static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode)
{
- struct evdev_list *list = file->private_data;
- struct evdev *evdev = list->evdev;
+ static unsigned long keymax_warn_time;
+ unsigned 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;
+ }
+
+ /*
+ * Work around bugs in userspace programs that like to do
+ * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
+ * should be in bytes, not in bits.
+ */
+ if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) {
+ len = OLD_KEY_MAX;
+ if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
+ printk(KERN_WARNING
+ "evdev.c(EVIOCGBIT): Suspicious buffer size %u, "
+ "limiting output to %zu bytes. See "
+ "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
+ OLD_KEY_MAX,
+ BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
+ }
+
+ return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
+}
+#undef OLD_KEY_MAX
+
+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;
- void __user *p = (void __user *)arg;
- int __user *ip = (int __user *)arg;
+ struct ff_effect effect;
+ int __user *ip = (int __user *)p;
int i, t, u, v;
-
- if (!evdev->exist) return -ENODEV;
+ int error;
switch (cmd) {
- case EVIOCGVERSION:
- return put_user(EV_VERSION, ip);
-
- case EVIOCGID:
- return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 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 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 (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 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 EVIOCGVERSION:
+ return put_user(EV_VERSION, ip);
- case EVIOCRMFF:
- if (dev->erase_effect) {
- return dev->erase_effect(dev, (int)arg);
- }
- else return -ENOSYS;
+ case EVIOCGID:
+ if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
+ return -EFAULT;
+ return 0;
- case EVIOCGEFFECTS:
- if (put_user(dev->ff_effects_max, ip))
- return -EFAULT;
- return 0;
-
- 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;
- }
+ 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;
- default:
-
- if (_IOC_TYPE(cmd) != 'E')
- return -EINVAL;
-
- 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;
- 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(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;
- }
+ 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;
- }
+ input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
+ input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
+
+ return 0;
+
+ case EVIOCGKEYCODE:
+ if (get_user(t, ip))
+ return -EFAULT;
+
+ error = input_get_keycode(dev, t, &v);
+ if (error)
+ return error;
- if (_IOC_DIR(cmd) == _IOC_WRITE) {
+ if (put_user(v, ip + 1))
+ return -EFAULT;
+
+ return 0;
+
+ case EVIOCSKEYCODE:
+ if (get_user(t, ip) || get_user(v, ip + 1))
+ return -EFAULT;
+
+ return input_set_keycode(dev, t, v);
+
+ 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);
+
+ default:
+
+ 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, cmd, 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);
+
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
+ return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
+ 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);
- if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
+ return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
+ p, compat_mode);
- int t = _IOC_NR(cmd) & ABS_MAX;
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
+ return str_to_user(dev->name, _IOC_SIZE(cmd), p);
- if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
- return -EFAULT;
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
+ return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
- 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 (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
+ return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
- return 0;
- }
+ if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
+
+ 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];
+ abs.resolution = dev->absres[t];
+
+ if (copy_to_user(p, &abs, min_t(size_t,
+ _IOC_SIZE(cmd),
+ sizeof(struct input_absinfo))))
+ return -EFAULT;
+
+ return 0;
}
- }
- return -EINVAL;
-}
-#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 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)
+ if (_IOC_DIR(cmd) == _IOC_WRITE) {
-#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*) 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
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
-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);
+ if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
+ return -EFAULT;
- if (!evdev->exist) return -ENODEV;
+ error = input_ff_upload(dev, &effect, file);
- switch (cmd) {
+ if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
+ return -EFAULT;
- case EVIOCGVERSION:
- case EVIOCGID:
- case EVIOCGKEYCODE:
- case EVIOCSKEYCODE:
- case EVIOCSFF:
- case EVIOCRMFF:
- case EVIOCGEFFECTS:
- case EVIOCGRAB:
- return evdev_ioctl(file, cmd, (unsigned long) p);
-
- default:
-
- if (_IOC_TYPE(cmd) != 'E')
- 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;
- 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(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;
- }
+ return error;
}
- if (_IOC_DIR(cmd) == _IOC_WRITE) {
+ if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
- if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
+ t = _IOC_NR(cmd) & ABS_MAX;
- int t = _IOC_NR(cmd) & ABS_MAX;
+ if (copy_from_user(&abs, p, min_t(size_t,
+ _IOC_SIZE(cmd),
+ sizeof(struct input_absinfo))))
+ return -EFAULT;
+
+ /*
+ * Take event lock to ensure that we are not
+ * changing device parameters in the middle
+ * of event.
+ */
+ spin_lock_irq(&dev->event_lock);
- 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;
+ dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
+ 0 : abs.resolution;
- 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;
+ spin_unlock_irq(&dev->event_lock);
- return 0;
- }
+ 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) {
+ 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
};
-static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
+static int evdev_install_chrdev(struct evdev *evdev)
+{
+ /*
+ * No need to do any locking here as calls to connect and
+ * disconnect are serialized by the input core
+ */
+ evdev_table[evdev->minor] = evdev;
+ return 0;
+}
+
+static void evdev_remove_chrdev(struct evdev *evdev)
+{
+ /*
+ * Lock evdev table to prevent race with evdev_open()
+ */
+ mutex_lock(&evdev_table_mutex);
+ evdev_table[evdev->minor] = NULL;
+ mutex_unlock(&evdev_table_mutex);
+}
+
+/*
+ * 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 = 0;
+ mutex_unlock(&evdev->mutex);
+}
+
+static void evdev_cleanup(struct evdev *evdev)
+{
+ struct input_handle *handle = &evdev->handle;
+
+ evdev_mark_dead(evdev);
+ evdev_hangup(evdev);
+ evdev_remove_chrdev(evdev);
+
+ /* 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 so we don't need to lock evdev_table here.
+ */
+static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
+ const struct input_device_id *id)
{
struct evdev *evdev;
int minor;
+ int error;
+
+ for (minor = 0; minor < EVDEV_MINORS; minor++)
+ if (!evdev_table[minor])
+ break;
- 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;
+ return -ENFILE;
}
- 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)
+ return -ENOMEM;
- 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);
+ dev_set_name(&evdev->dev, "event%d", minor);
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, EVDEV_MINOR_BASE + 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;
- devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
- S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);
- class_device_create(input_class,
- MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
- dev->dev, "event%d", minor);
+ error = evdev_install_chrdev(evdev);
+ if (error)
+ goto err_unregister_handle;
- return &evdev->handle;
+ error = device_add(&evdev->dev);
+ if (error)
+ goto err_cleanup_evdev;
+
+ return 0;
+
+ err_cleanup_evdev:
+ evdev_cleanup(evdev);
+ err_unregister_handle:
+ input_unregister_handle(&evdev->handle);
+ err_free_evdev:
+ put_device(&evdev->dev);
+ return error;
}
static void evdev_disconnect(struct input_handle *handle)
{
struct evdev *evdev = handle->private;
- struct evdev_list *list;
-
- class_device_destroy(input_class,
- MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
- devfs_remove("input/event%d", 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_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 */
};
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,
+ .connect = evdev_connect,
+ .disconnect = evdev_disconnect,
+ .fops = &evdev_fops,
+ .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)