Min/Max delay for Light and Temperature

[android-x86/hardware-intel-libsensors.git] / entry.c

diff --git a/entry.c b/entry.c
index 24894ea..df449db 100644 (file)
--- a/entry.c
+++ b/entry.c
@@ -6,6 +6,7 @@
 #include <utils/Log.h>
 #include "enumeration.h"
 #include "control.h"
+#include "description.h"
 
 /* This is the IIO Sensors HAL module entry points file */
 
@@ -16,6 +17,25 @@ static int activate(struct sensors_poll_device_t* dev, int handle, int enabled)
        if (init_count == 0 || handle < 0 || handle >= sensor_count)
                return -EINVAL;
 
+       /*
+        * The Intel sensor hub seems to have trouble enabling sensors before
+        * a sampling rate has been configured, and setting the sampling rate
+        * after it's been enabled does not seem to revive affected sensors.
+        * The issue does not show up with an up to date ISH firmware but as the
+        * updater is a Windows only tool and is not widely available, implement
+        * a workaround for this behavior. We set the initial sampling rate to
+        * 10 events per second when the sensor is enabled for the first time.
+        */
+       if (enabled && sensor_get_quirks(handle) & QUIRK_INITIAL_RATE) {
+               ALOGI("Forcing initial sampling rate\n");
+               sensor_activate(handle, 1);
+               sensor_set_delay(handle, 100000000L);   /* Start with 100 ms */
+               sensor_activate(handle, 0);
+
+               /* Clear flag for this sensor as do this only once */
+               sensor_info[handle].quirks ^= QUIRK_INITIAL_RATE;
+       }
+
        return sensor_activate(handle, enabled);
 }