1 files changed, 139 insertions, 78 deletions

diff --git a/drivers/input/input.c b/drivers/input/input.c
index ccaeb2426385..ebb2b7f0f8ff 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -24,6 +24,7 @@
 #include <linux/mutex.h>
 #include <linux/rcupdate.h>
 #include "input-compat.h"
+#include "input-core-private.h"
 #include "input-poller.h"
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
@@ -47,6 +48,17 @@ static DEFINE_MUTEX(input_mutex);
 
 static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
 
+static const unsigned int input_max_code[EV_CNT] = {
+	[EV_KEY] = KEY_MAX,
+	[EV_REL] = REL_MAX,
+	[EV_ABS] = ABS_MAX,
+	[EV_MSC] = MSC_MAX,
+	[EV_SW] = SW_MAX,
+	[EV_LED] = LED_MAX,
+	[EV_SND] = SND_MAX,
+	[EV_FF] = FF_MAX,
+};
+
 static inline int is_event_supported(unsigned int code,
 				     unsigned long *bm, unsigned int max)
 {
@@ -131,6 +143,8 @@ static void input_pass_values(struct input_dev *dev,
 	struct input_handle *handle;
 	struct input_value *v;
 
+	lockdep_assert_held(&dev->event_lock);
+
 	if (!count)
 		return;
 
@@ -163,44 +177,6 @@ static void input_pass_values(struct input_dev *dev,
 	}
 }
 
-static void input_pass_event(struct input_dev *dev,
-			     unsigned int type, unsigned int code, int value)
-{
-	struct input_value vals[] = { { type, code, value } };
-
-	input_pass_values(dev, vals, ARRAY_SIZE(vals));
-}
-
-/*
- * Generate software autorepeat event. Note that we take
- * dev->event_lock here to avoid racing with input_event
- * which may cause keys get "stuck".
- */
-static void input_repeat_key(struct timer_list *t)
-{
-	struct input_dev *dev = from_timer(dev, t, timer);
-	unsigned long flags;
-
-	spin_lock_irqsave(&dev->event_lock, flags);
-
-	if (test_bit(dev->repeat_key, dev->key) &&
-	    is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
-		struct input_value vals[] =  {
-			{ EV_KEY, dev->repeat_key, 2 },
-			input_value_sync
-		};
-
-		input_set_timestamp(dev, ktime_get());
-		input_pass_values(dev, vals, ARRAY_SIZE(vals));
-
-		if (dev->rep[REP_PERIOD])
-			mod_timer(&dev->timer, jiffies +
-					msecs_to_jiffies(dev->rep[REP_PERIOD]));
-	}
-
-	spin_unlock_irqrestore(&dev->event_lock, flags);
-}
-
 #define INPUT_IGNORE_EVENT	0
 #define INPUT_PASS_TO_HANDLERS	1
 #define INPUT_PASS_TO_DEVICE	2
@@ -264,6 +240,10 @@ static int input_get_disposition(struct input_dev *dev,
 	int disposition = INPUT_IGNORE_EVENT;
 	int value = *pval;
 
+	/* filter-out events from inhibited devices */
+	if (dev->inhibited)
+		return INPUT_IGNORE_EVENT;
+
 	switch (type) {
 
 	case EV_SYN:
@@ -364,19 +344,9 @@ static int input_get_disposition(struct input_dev *dev,
 	return disposition;
 }
 
-static void input_handle_event(struct input_dev *dev,
-			       unsigned int type, unsigned int code, int value)
+static void input_event_dispose(struct input_dev *dev, int disposition,
+				unsigned int type, unsigned int code, int value)
 {
-	int disposition;
-
-	/* filter-out events from inhibited devices */
-	if (dev->inhibited)
-		return;
-
-	disposition = input_get_disposition(dev, type, code, &value);
-	if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
-		add_input_randomness(type, code, value);
-
 	if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
 		dev->event(dev, type, code, value);
 
@@ -415,7 +385,22 @@ static void input_handle_event(struct input_dev *dev,
 		input_pass_values(dev, dev->vals, dev->num_vals);
 		dev->num_vals = 0;
 	}
+}
+
+void input_handle_event(struct input_dev *dev,
+			unsigned int type, unsigned int code, int value)
+{
+	int disposition;
+
+	lockdep_assert_held(&dev->event_lock);
+
+	disposition = input_get_disposition(dev, type, code, &value);
+	if (disposition != INPUT_IGNORE_EVENT) {
+		if (type != EV_SYN)
+			add_input_randomness(type, code, value);
 
+		input_event_dispose(dev, disposition, type, code, value);
+	}
 }
 
 /**
@@ -511,6 +496,9 @@ void input_set_abs_params(struct input_dev *dev, unsigned int axis,
 {
 	struct input_absinfo *absinfo;
 
+	__set_bit(EV_ABS, dev->evbit);
+	__set_bit(axis, dev->absbit);
+
 	input_alloc_absinfo(dev);
 	if (!dev->absinfo)
 		return;
@@ -520,12 +508,45 @@ void input_set_abs_params(struct input_dev *dev, unsigned int axis,
 	absinfo->maximum = max;
 	absinfo->fuzz = fuzz;
 	absinfo->flat = flat;
-
-	__set_bit(EV_ABS, dev->evbit);
-	__set_bit(axis, dev->absbit);
 }
 EXPORT_SYMBOL(input_set_abs_params);
 
+/**
+ * input_copy_abs - Copy absinfo from one input_dev to another
+ * @dst: Destination input device to copy the abs settings to
+ * @dst_axis: ABS_* value selecting the destination axis
+ * @src: Source input device to copy the abs settings from
+ * @src_axis: ABS_* value selecting the source axis
+ *
+ * Set absinfo for the selected destination axis by copying it from
+ * the specified source input device's source axis.
+ * This is useful to e.g. setup a pen/stylus input-device for combined
+ * touchscreen/pen hardware where the pen uses the same coordinates as
+ * the touchscreen.
+ */
+void input_copy_abs(struct input_dev *dst, unsigned int dst_axis,
+		    const struct input_dev *src, unsigned int src_axis)
+{
+	/* src must have EV_ABS and src_axis set */
+	if (WARN_ON(!(test_bit(EV_ABS, src->evbit) &&
+		      test_bit(src_axis, src->absbit))))
+		return;
+
+	/*
+	 * input_alloc_absinfo() may have failed for the source. Our caller is
+	 * expected to catch this when registering the input devices, which may
+	 * happen after the input_copy_abs() call.
+	 */
+	if (!src->absinfo)
+		return;
+
+	input_set_capability(dst, EV_ABS, dst_axis);
+	if (!dst->absinfo)
+		return;
+
+	dst->absinfo[dst_axis] = src->absinfo[src_axis];
+}
+EXPORT_SYMBOL(input_copy_abs);
 
 /**
  * input_grab_device - grabs device for exclusive use
@@ -566,7 +587,7 @@ static void __input_release_device(struct input_handle *handle)
 					    lockdep_is_held(&dev->mutex));
 	if (grabber == handle) {
 		rcu_assign_pointer(dev->grab, NULL);
-		/* Make sure input_pass_event() notices that grab is gone */
+		/* Make sure input_pass_values() notices that grab is gone */
 		synchronize_rcu();
 
 		list_for_each_entry(handle, &dev->h_list, d_node)
@@ -689,7 +710,7 @@ void input_close_device(struct input_handle *handle)
 
 	if (!--handle->open) {
 		/*
-		 * synchronize_rcu() makes sure that input_pass_event()
+		 * synchronize_rcu() makes sure that input_pass_values()
 		 * completed and that no more input events are delivered
 		 * through this handle
 		 */
@@ -704,22 +725,21 @@ EXPORT_SYMBOL(input_close_device);
  * Simulate keyup events for all keys that are marked as pressed.
  * The function must be called with dev->event_lock held.
  */
-static void input_dev_release_keys(struct input_dev *dev)
+static bool input_dev_release_keys(struct input_dev *dev)
 {
 	bool need_sync = false;
 	int code;
 
+	lockdep_assert_held(&dev->event_lock);
+
 	if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
 		for_each_set_bit(code, dev->key, KEY_CNT) {
-			input_pass_event(dev, EV_KEY, code, 0);
+			input_handle_event(dev, EV_KEY, code, 0);
 			need_sync = true;
 		}
-
-		if (need_sync)
-			input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
-
-		memset(dev->key, 0, sizeof(dev->key));
 	}
+
+	return need_sync;
 }
 
 /*
@@ -746,7 +766,8 @@ static void input_disconnect_device(struct input_dev *dev)
 	 * generate events even after we done here but they will not
 	 * reach any handlers.
 	 */
-	input_dev_release_keys(dev);
+	if (input_dev_release_keys(dev))
+		input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
 
 	list_for_each_entry(handle, &dev->h_list, d_node)
 		handle->open = 0;
@@ -957,12 +978,16 @@ int input_set_keycode(struct input_dev *dev,
 	} else if (test_bit(EV_KEY, dev->evbit) &&
 		   !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
 		   __test_and_clear_bit(old_keycode, dev->key)) {
-		struct input_value vals[] =  {
-			{ EV_KEY, old_keycode, 0 },
-			input_value_sync
-		};
-
-		input_pass_values(dev, vals, ARRAY_SIZE(vals));
+		/*
+		 * We have to use input_event_dispose() here directly instead
+		 * of input_handle_event() because the key we want to release
+		 * here is considered no longer supported by the device and
+		 * input_handle_event() will ignore it.
+		 */
+		input_event_dispose(dev, INPUT_PASS_TO_HANDLERS,
+				    EV_KEY, old_keycode, 0);
+		input_event_dispose(dev, INPUT_PASS_TO_HANDLERS | INPUT_FLUSH,
+				    EV_SYN, SYN_REPORT, 1);
 	}
 
  out:
@@ -1737,7 +1762,8 @@ void input_reset_device(struct input_dev *dev)
 	spin_lock_irqsave(&dev->event_lock, flags);
 
 	input_dev_toggle(dev, true);
-	input_dev_release_keys(dev);
+	if (input_dev_release_keys(dev))
+		input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
 
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 	mutex_unlock(&dev->mutex);
@@ -1746,8 +1772,6 @@ EXPORT_SYMBOL(input_reset_device);
 
 static int input_inhibit_device(struct input_dev *dev)
 {
-	int ret = 0;
-
 	mutex_lock(&dev->mutex);
 
 	if (dev->inhibited)
@@ -1761,7 +1785,9 @@ static int input_inhibit_device(struct input_dev *dev)
 	}
 
 	spin_lock_irq(&dev->event_lock);
+	input_mt_release_slots(dev);
 	input_dev_release_keys(dev);
+	input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
 	input_dev_toggle(dev, false);
 	spin_unlock_irq(&dev->event_lock);
 
@@ -1769,7 +1795,7 @@ static int input_inhibit_device(struct input_dev *dev)
 
 out:
 	mutex_unlock(&dev->mutex);
-	return ret;
+	return 0;
 }
 
 static int input_uninhibit_device(struct input_dev *dev)
@@ -1812,7 +1838,8 @@ static int input_dev_suspend(struct device *dev)
 	 * Keys that are pressed now are unlikely to be
 	 * still pressed when we resume.
 	 */
-	input_dev_release_keys(input_dev);
+	if (input_dev_release_keys(input_dev))
+		input_handle_event(input_dev, EV_SYN, SYN_REPORT, 1);
 
 	/* Turn off LEDs and sounds, if any are active. */
 	input_dev_toggle(input_dev, false);
@@ -1846,7 +1873,8 @@ static int input_dev_freeze(struct device *dev)
 	 * Keys that are pressed now are unlikely to be
 	 * still pressed when we resume.
 	 */
-	input_dev_release_keys(input_dev);
+	if (input_dev_release_keys(input_dev))
+		input_handle_event(input_dev, EV_SYN, SYN_REPORT, 1);
 
 	spin_unlock_irq(&input_dev->event_lock);
 
@@ -2074,6 +2102,14 @@ EXPORT_SYMBOL(input_get_timestamp);
  */
 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
 {
+	if (type < EV_CNT && input_max_code[type] &&
+	    code > input_max_code[type]) {
+		pr_err("%s: invalid code %u for type %u\n", __func__, code,
+		       type);
+		dump_stack();
+		return;
+	}
+
 	switch (type) {
 	case EV_KEY:
 		__set_bit(code, dev->keybit);
@@ -2085,9 +2121,6 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int
 
 	case EV_ABS:
 		input_alloc_absinfo(dev);
-		if (!dev->absinfo)
-			return;
-
 		__set_bit(code, dev->absbit);
 		break;
 
@@ -2209,6 +2242,34 @@ static void devm_input_device_unregister(struct device *dev, void *res)
 	__input_unregister_device(input);
 }
 
+/*
+ * Generate software autorepeat event. Note that we take
+ * dev->event_lock here to avoid racing with input_event
+ * which may cause keys get "stuck".
+ */
+static void input_repeat_key(struct timer_list *t)
+{
+	struct input_dev *dev = from_timer(dev, t, timer);
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+
+	if (!dev->inhibited &&
+	    test_bit(dev->repeat_key, dev->key) &&
+	    is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
+
+		input_set_timestamp(dev, ktime_get());
+		input_handle_event(dev, EV_KEY, dev->repeat_key, 2);
+		input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
+
+		if (dev->rep[REP_PERIOD])
+			mod_timer(&dev->timer, jiffies +
+					msecs_to_jiffies(dev->rep[REP_PERIOD]));
+	}
+
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
 /**
  * input_enable_softrepeat - enable software autorepeat
  * @dev: input device