[v5,0/2] Add temperature notification support

Message

Avri Altman Sept. 14, 2021, 6:53 a.m. UTC

v4 - > v5:
 - Fix improper return error values
 
v3 -> v4:
 - Attend Guenter's comments

v2 -> v3:
 - Attend Bart's & Guenter's comments

v1 -> v2:
 - Add a hw monitor device if both the platform & the device support it
 - Remove the sysfs patch: no need to duplicate /sys/class/hwmon

UFS3.0 allows using the ufs device as a temperature sensor. The purpose
of this optional feature is to provide notification to the host of the
UFS device case temperature. It allows reading of a rough estimate
(+-10 degrees centigrade) of the current case temperature, and setting a
lower and upper temperature bounds, in which the device will trigger an
applicable exception event.

A previous attempt [1] tried a comprehensive approach.  Still, it was
unsuccessful. Here is a more modest approach that introduces just the
bare minimum to support temperature notification.

Thanks,
Avri

Avri Altman (2):
  scsi: ufs: Probe for temperature notification support
  scsi: ufs: Add temperature notification exception handling

 drivers/scsi/ufs/Kconfig     |   9 ++
 drivers/scsi/ufs/Makefile    |   1 +
 drivers/scsi/ufs/ufs-hwmon.c | 213 +++++++++++++++++++++++++++++++++++
 drivers/scsi/ufs/ufs.h       |   7 ++
 drivers/scsi/ufs/ufshcd.c    |  47 ++++++++
 drivers/scsi/ufs/ufshcd.h    |  20 ++++
 6 files changed, 297 insertions(+)
 create mode 100644 drivers/scsi/ufs/ufs-hwmon.c