misc: nct1008: add nfactor support

Add support to read a fuse value and program the nfactor and offset
for TMP451. Also provide support to parse compensation alpha and beta
from the DT.

Bug 200294481

Reviewed-on: https://git-master.nvidia.com/r/1515505
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
(cherry picked from commit fc11d649ae4f2480672f925a742640cf05a14b7c)

Edits:
* Moved fuse.h to a seperate change as it is in a different repo.
* add error checking.
* write to nfactor_corr only for platforms that support fuse offsets.

Change-Id: I7ec603d06415bc2189810a95f5d1bf1393eb0e46
Signed-off-by: Srikar Srimath Tirumala <srikars@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1544333
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Jon Mayo <jmayo@nvidia.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/nct1008.h b/include/linux/nct1008.h
index 6caa1c8fd..75e941502 100644
--- a/include/linux/nct1008.h
+++ b/include/linux/nct1008.h
@@ -3,7 +3,7 @@
  *
  * NCT1008, temperature monitoring device from ON Semiconductors
  *
- * Copyright (c) 2010-2016, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2010-2017, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -50,9 +50,12 @@ struct nct1008_platform_data {
         bool supported_hwrev;
         int conv_rate;
         int offset;
+        int alpha;
+        int beta;
         const char *loc_name;
         struct nct1008_sensor_platform_data sensors[SENSORS_COUNT];
         int (*suspend_with_wakeup)(void);
         bool extended_range;
+        bool fuse_offset;
 };
 #endif /* _LINUX_NCT1008_H */