Input: evdev - use driver hint to compute size of event buffer

Some devices, in particular MT devices, produce a lot of data.  This
may lead to overflowing of the event queues in evdev driver, which
by default are fairly small. Let the drivers hint the average number
of events per packet generated by the device, and use that information
when computing the buffer size evdev should use for the device.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/input.h b/include/linux/input.h
index 6fcc9101beeb..cc524c8b6703 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -1063,6 +1063,10 @@ struct ff_effect {
  * @sndbit: bitmap of sound effects supported by the device
  * @ffbit: bitmap of force feedback effects supported by the device
  * @swbit: bitmap of switches present on the device
+ * @hint_events_per_packet: average number of events generated by the
+ *      device in a packet (between EV_SYN/SYN_REPORT events). Used by
+ *      event handlers to estimate size of the buffer needed to hold
+ *      events.
  * @keycodemax: size of keycode table
  * @keycodesize: size of elements in keycode table
  * @keycode: map of scancodes to keycodes for this device
@@ -1140,6 +1144,8 @@ struct input_dev {
         unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
         unsigned long swbit[BITS_TO_LONGS(SW_CNT)];
 
+        unsigned int hint_events_per_packet;
+
         unsigned int keycodemax;
         unsigned int keycodesize;
         void *keycode;
@@ -1408,6 +1414,21 @@ static inline void input_mt_sync(struct input_dev *dev)
 
 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
 
+/**
+ * input_set_events_per_packet - tell handlers about the driver event rate
+ * @dev: the input device used by the driver
+ * @n_events: the average number of events between calls to input_sync()
+ *
+ * If the event rate sent from a device is unusually large, use this
+ * function to set the expected event rate. This will allow handlers
+ * to set up an appropriate buffer size for the event stream, in order
+ * to minimize information loss.
+ */
+static inline void input_set_events_per_packet(struct input_dev *dev, int n_events)
+{
+        dev->hint_events_per_packet = n_events;
+}
+
 static inline void input_set_abs_params(struct input_dev *dev, int axis, int min, int max, int fuzz, int flat)
 {
         dev->absmin[axis] = min;