link: Temp sensor read can return an error code

This will be used in a follow-up CL to return specific error codes
(not powered, not calibrated, etc.)

BUG=chrome-os-partner:15174
BRANCH=link
TEST=manual

Power on system.
'temps' should return all good temps.
Power off system (into S5)
Only ECInternal temp should work; others should return Error 1
'gpioset enable_vs 1' and wait a second
Now all the I2C temps should display good data, but PECI will still be error 1.

Change-Id: I925434e71653ad53ad76bad992a7a8fdeadb088c
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/35286
Reviewed-by: Bill Richardson <wfrichar@chromium.org>

1 files changed, 9 insertions, 4 deletions

diff --git a/include/peci.h b/include/peci.h
index e24a3d0c15..4776002a42 100644
--- a/include/peci.h
+++ b/include/peci.h
@@ -16,10 +16,15 @@
  * error, retry a bit later. */
 int peci_get_cpu_temp(void);
 
-/* Read the CPU temperature sensor via PECI.  This interface is for the
- * temperature sensor module.  Returns the temperature in degrees K, or -1 if
- * error. */
-int peci_temp_sensor_get_val(int idx);
+/**
+ * Get the last polled value of the PECI temp sensor.
+ *
+ * @param idx		Sensor index to read.
+ * @param temp_ptr	Destination for temperature in K.
+ *
+ * @return EC_SUCCESS if successful, non-zero if error.
+ */
+int peci_temp_sensor_get_val(int idx, int *temp_ptr);
 
 /* Temperature polling of CPU temperature sensor via PECI. */
 int peci_temp_sensor_poll(void);