1 files changed, 85 insertions, 22 deletions

diff --git a/include/linux/input.h b/include/linux/input.h
index 6fcc9101beeb..896a92227bc4 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -691,9 +691,12 @@ struct input_absinfo {
 #define ABS_TILT_X              0x1a
 #define ABS_TILT_Y              0x1b
 #define ABS_TOOL_WIDTH          0x1c
+
 #define ABS_VOLUME              0x20
+
 #define ABS_MISC                0x28
 
+#define ABS_MT_SLOT             0x2f    /* MT slot being modified */
 #define ABS_MT_TOUCH_MAJOR      0x30    /* Major axis of touching ellipse */
 #define ABS_MT_TOUCH_MINOR      0x31    /* Minor axis (omit if circular) */
 #define ABS_MT_WIDTH_MAJOR      0x32    /* Major axis of approaching ellipse */
@@ -706,6 +709,12 @@ struct input_absinfo {
 #define ABS_MT_TRACKING_ID      0x39    /* Unique ID of initiated contact */
 #define ABS_MT_PRESSURE         0x3a    /* Pressure on contact area */
 
+#ifdef __KERNEL__
+/* Implementation details, userspace should not care about these */
+#define ABS_MT_FIRST            ABS_MT_TOUCH_MAJOR
+#define ABS_MT_LAST             ABS_MT_PRESSURE
+#endif
+
 #define ABS_MAX                 0x3f
 #define ABS_CNT                 (ABS_MAX+1)
 
@@ -767,6 +776,7 @@ struct input_absinfo {
 #define REP_DELAY               0x00
 #define REP_PERIOD              0x01
 #define REP_MAX                 0x01
+#define REP_CNT                 (REP_MAX+1)
 
 /*
  * Sounds
@@ -1048,6 +1058,14 @@ struct ff_effect {
 #include <linux/mod_devicetable.h>
 
 /**
+ * struct input_mt_slot - represents the state of an input MT slot
+ * @abs: holds current values of ABS_MT axes for this slot
+ */
+struct input_mt_slot {
+        int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
+};
+
+/**
  * struct input_dev - represents an input device
  * @name: name of the device
  * @phys: physical path to the device in the system hierarchy
@@ -1063,6 +1081,10 @@ 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
@@ -1078,18 +1100,18 @@ struct ff_effect {
  * @repeat_key: stores key code of the last key pressed; used to implement
  *      software autorepeat
  * @timer: timer for software autorepeat
- * @sync: set to 1 when there were no new events since last EV_SYNC
- * @abs: current values for reports from absolute axes
  * @rep: current values for autorepeat parameters (delay, rate)
+ * @mt: pointer to array of struct input_mt_slot holding current values
+ *      of tracked contacts
+ * @mtsize: number of MT slots the device uses
+ * @slot: MT slot currently being transmitted
+ * @absinfo: array of &struct absinfo elements holding information
+ *      about absolute axes (current value, min, max, flat, fuzz,
+ *      resolution)
  * @key: reflects current state of device's keys/buttons
  * @led: reflects current state of device's LEDs
  * @snd: reflects current state of sound effects
  * @sw: reflects current state of device's switches
- * @absmax: maximum values for events coming from absolute axes
- * @absmin: minimum values for events coming from absolute axes
- * @absfuzz: describes noisiness for axes
- * @absflat: size of the center flat position (used by joydev)
- * @absres: resolution used for events coming form absolute axes
  * @open: this method is called when the very first user calls
  *      input_open_device(). The driver must prepare the device
  *      to start generating events (start polling thread,
@@ -1119,6 +1141,7 @@ struct ff_effect {
  *      last user closes the device
  * @going_away: marks devices that are in a middle of unregistering and
  *      causes input_open_device*() fail with -ENODEV.
+ * @sync: set to %true when there were no new events since last EV_SYN
  * @dev: driver model's view of this device
  * @h_list: list of input handles associated with the device. When
  *      accessing the list dev->mutex must be held
@@ -1140,6 +1163,8 @@ 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;
@@ -1153,22 +1178,19 @@ struct input_dev {
         unsigned int repeat_key;
         struct timer_list timer;
 
-        int sync;
+        int rep[REP_CNT];
+
+        struct input_mt_slot *mt;
+        int mtsize;
+        int slot;
 
-        int abs[ABS_CNT];
-        int rep[REP_MAX + 1];
+        struct input_absinfo *absinfo;
 
         unsigned long key[BITS_TO_LONGS(KEY_CNT)];
         unsigned long led[BITS_TO_LONGS(LED_CNT)];
         unsigned long snd[BITS_TO_LONGS(SND_CNT)];
         unsigned long sw[BITS_TO_LONGS(SW_CNT)];
 
-        int absmax[ABS_CNT];
-        int absmin[ABS_CNT];
-        int absfuzz[ABS_CNT];
-        int absflat[ABS_CNT];
-        int absres[ABS_CNT];
-
         int (*open)(struct input_dev *dev);
         void (*close)(struct input_dev *dev);
         int (*flush)(struct input_dev *dev, struct file *file);
@@ -1182,6 +1204,8 @@ struct input_dev {
         unsigned int users;
         bool going_away;
 
+        bool sync;
+
         struct device dev;
 
         struct list_head        h_list;
@@ -1406,18 +1430,54 @@ static inline void input_mt_sync(struct input_dev *dev)
         input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
 }
 
+static inline void input_mt_slot(struct input_dev *dev, int slot)
+{
+        input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
+}
+
 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
 
-static inline void input_set_abs_params(struct input_dev *dev, int axis, int min, int max, int fuzz, int flat)
+/**
+ * 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->absmin[axis] = min;
-        dev->absmax[axis] = max;
-        dev->absfuzz[axis] = fuzz;
-        dev->absflat[axis] = flat;
+        dev->hint_events_per_packet = n_events;
+}
 
-        dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
+void input_alloc_absinfo(struct input_dev *dev);
+void input_set_abs_params(struct input_dev *dev, unsigned int axis,
+                          int min, int max, int fuzz, int flat);
+
+#define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item)                    \
+static inline int input_abs_get_##_suffix(struct input_dev *dev,        \
+                                          unsigned int axis)            \
+{                                                                       \
+        return dev->absinfo ? dev->absinfo[axis]._item : 0;             \
+}                                                                       \
+                                                                        \
+static inline void input_abs_set_##_suffix(struct input_dev *dev,       \
+                                           unsigned int axis, int val)  \
+{                                                                       \
+        input_alloc_absinfo(dev);                                       \
+        if (dev->absinfo)                                               \
+                dev->absinfo[axis]._item = val;                         \
 }
 
+INPUT_GENERATE_ABS_ACCESSORS(val, value)
+INPUT_GENERATE_ABS_ACCESSORS(min, minimum)
+INPUT_GENERATE_ABS_ACCESSORS(max, maximum)
+INPUT_GENERATE_ABS_ACCESSORS(fuzz, fuzz)
+INPUT_GENERATE_ABS_ACCESSORS(flat, flat)
+INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
+
 int input_get_keycode(struct input_dev *dev,
                       unsigned int scancode, unsigned int *keycode);
 int input_set_keycode(struct input_dev *dev,
@@ -1485,5 +1545,8 @@ int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
 int input_ff_create_memless(struct input_dev *dev, void *data,
                 int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
 
+int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots);
+void input_mt_destroy_slots(struct input_dev *dev);
+
 #endif
 #endif