bq20z75: Add support for external notification

Adding support for external power change notification. One problem found
is that there is a lag time before the sensor will return a new status.
To ensure that we only fire off the power_supply_changed event when the
status returned from the sensor is actually different, we delay sending
the the notification, and instead poll on it looking for a change. The
amount of time to poll is configurable via platform data.

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/power/bq20z75.h b/include/linux/power/bq20z75.h
index b0843b68af92..1398eb004e83 100644
--- a/include/linux/power/bq20z75.h
+++ b/include/linux/power/bq20z75.h
@@ -29,11 +29,14 @@
  * @battery_detect:             GPIO which is used to detect battery presence
  * @battery_detect_present:     gpio state when battery is present (0 / 1)
  * @i2c_retry_count:            # of times to retry on i2c IO failure
+ * @poll_retry_count:           # of times to retry looking for new status after
+ *                              external change notification
  */
 struct bq20z75_platform_data {
         int battery_detect;
         int battery_detect_present;
         int i2c_retry_count;
+        int poll_retry_count;
 };
 
 #endif