#define EVDEV_MINOR_BASE 64
#define EVDEV_MINORS 32
-#define EVDEV_BUFFER_SIZE 64
+#define EVDEV_MIN_BUFFER_SIZE 64
#include <linux/poll.h>
#include <linux/sched.h>
};
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;
+ int bufsize;
+ struct input_event buffer[];
};
static struct evdev *evdev_table[EVDEV_MINORS];
*/
spin_lock(&client->buffer_lock);
client->buffer[client->head++] = *event;
- client->head &= EVDEV_BUFFER_SIZE - 1;
+ client->head &= client->bufsize - 1;
spin_unlock(&client->buffer_lock);
if (event->type == EV_SYN)
return 0;
}
+static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
+{
+ return EVDEV_MIN_BUFFER_SIZE;
+}
+
static int evdev_open(struct inode *inode, struct file *file)
{
struct evdev *evdev;
struct evdev_client *client;
int i = iminor(inode) - EVDEV_MINOR_BASE;
+ unsigned int bufsize;
int error;
if (i >= EVDEV_MINORS)
if (!evdev)
return -ENODEV;
- client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
+ bufsize = evdev_compute_buffer_size(evdev->handle.dev);
+
+ client = kzalloc(sizeof(struct evdev_client) +
+ bufsize * sizeof(struct input_event),
+ GFP_KERNEL);
if (!client) {
error = -ENOMEM;
goto err_put_evdev;
}
+ client->bufsize = bufsize;
spin_lock_init(&client->buffer_lock);
client->evdev = evdev;
evdev_attach_client(evdev, client);
have_event = client->head != client->tail;
if (have_event) {
*event = client->buffer[client->tail++];
- client->tail &= EVDEV_BUFFER_SIZE - 1;
+ client->tail &= client->bufsize - 1;
}
spin_unlock_irq(&client->buffer_lock);