Merge tag 'input-for-v6.5-rc0' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

Pull input updates from Dmitry Torokhov:

 - improvements to PS/2 handling for case when EC has already latched a
   scancode in the data register, but the kernel expects to receive an
   ACK to a command it sent to a device (such as keyboard LED toggle)

 - input drivers for devices connected over I2C bus have been switched
   back to using [new] .probe()

 - uinput allows userspace to inject timestamps for input events

 - support for capacitive keys in Atmel touch controller driver

 - assorted fixes to drv260x, pwm-vibra, ili210x, adxl34x, and other
   drivers

* tag 'input-for-v6.5-rc0' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (40 commits)
  Input: pm8941-powerkey - fix debounce on gen2+ PMICs
  MAINTAINERS: Adjust Qualcomm driver globbing
  Input: gameport - provide default trigger() and read()
  Input: tps65219-pwrbutton - use regmap_set_bits()
  Input: tps65219-pwrbutton - convert to .remove_new()
  Input: tests - add test to cover all input_grab_device() function
  Input: gpio-keys - use input_report_key()
  Input: xpad - spelling fixes for "Xbox"
  Input: add HAS_IOPORT dependencies
  Input: libps2 - do not discard non-ack bytes when controlling LEDs
  Input: libps2 - introduce common interrupt handler
  Input: libps2 - fix aborting PS/2 commands
  Input: libps2 - fix NAK handling
  Input: libps2 - rework handling of command response
  Input: libps2 - remove special handling of ACK for command byte
  Input: libps2 - attach ps2dev instances as serio port's drvdata
  Input: Switch i2c drivers back to use .probe()
  dt-bindings: input: cypress,cyapa: convert to dtschema
  Input: adxl34x - do not hardcode interrupt trigger type
  Input: pwm-vibra - add support for enable GPIO
  ...

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index f2593133e524..d98212d55108 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -33,6 +33,7 @@
 #define UINPUT_NAME		"uinput"
 #define UINPUT_BUFFER_SIZE	16
 #define UINPUT_NUM_REQUESTS	16
+#define UINPUT_TIMESTAMP_ALLOWED_OFFSET_SECS 10
 
 enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
 
@@ -569,11 +570,40 @@ static int uinput_setup_device_legacy(struct uinput_device *udev,
 	return retval;
 }
 
+/*
+ * Returns true if the given timestamp is valid (i.e., if all the following
+ * conditions are satisfied), false otherwise.
+ * 1) given timestamp is positive
+ * 2) it's within the allowed offset before the current time
+ * 3) it's not in the future
+ */
+static bool is_valid_timestamp(const ktime_t timestamp)
+{
+	ktime_t zero_time;
+	ktime_t current_time;
+	ktime_t min_time;
+	ktime_t offset;
+
+	zero_time = ktime_set(0, 0);
+	if (ktime_compare(zero_time, timestamp) >= 0)
+		return false;
+
+	current_time = ktime_get();
+	offset = ktime_set(UINPUT_TIMESTAMP_ALLOWED_OFFSET_SECS, 0);
+	min_time = ktime_sub(current_time, offset);
+
+	if (ktime_after(min_time, timestamp) || ktime_after(timestamp, current_time))
+		return false;
+
+	return true;
+}
+
 static ssize_t uinput_inject_events(struct uinput_device *udev,
 				    const char __user *buffer, size_t count)
 {
 	struct input_event ev;
 	size_t bytes = 0;
+	ktime_t timestamp;
 
 	if (count != 0 && count < input_event_size())
 		return -EINVAL;
@@ -588,6 +618,10 @@ static ssize_t uinput_inject_events(struct uinput_device *udev,
 		if (input_event_from_user(buffer + bytes, &ev))
 			return -EFAULT;
 
+		timestamp = ktime_set(ev.input_event_sec, ev.input_event_usec * NSEC_PER_USEC);
+		if (is_valid_timestamp(timestamp))
+			input_set_timestamp(udev->dev, timestamp);
+
 		input_event(udev->dev, ev.type, ev.code, ev.value);
 		bytes += input_event_size();
 		cond_resched();