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COMMON: Add extend function for tmp432 IC

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+ create interface to set ALERT# pin as THERM mode
  and set high limit for a selected channel

BUG=None
BRANCH=master
TEST=`make -j runtests`

Change-Id: I7325eb9ddfcaca3ea873e1ee71da74258d7bec72
Signed-off-by: Ryan Zhang <Ryan.Zhang@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/344435
Reviewed-by: Shawn N <shawnn@chromium.org>
This commit is contained in:
Ryan Zhang
2016-05-16 10:31:29 +08:00
committed by chrome-bot
parent f817140c3e
commit 35d534dfb3
2 changed files with 90 additions and 0 deletions
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59
driver/temp_sensor/tmp432.c
View File

@@ -117,6 +117,65 @@ static int tmp432_shutdown(uint8_t want_shutdown)
return ret;
}
static int tmp432_set_therm_mode(void)
{
int ret = 0;
int data = 0;
ret = raw_read8(TMP432_CONFIGURATION1_R, &data);
if (ret)
return EC_ERROR_UNKNOWN;
data |= TMP432_CONFIG1_MODE;
ret = raw_write8(TMP432_CONFIGURATION1_W, data);
if (ret)
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
int tmp432_set_therm_limit(int channel, int limit_c, int hysteresis)
{
int ret = 0;
int reg = 0;
if (channel >= TMP432_CHANNEL_COUNT)
return EC_ERROR_INVAL;
if (hysteresis > TMP432_HYSTERESIS_HIGH_LIMIT ||
hysteresis < TMP432_HYSTERESIS_LOW_LIMIT)
return EC_ERROR_INVAL;
/* hysteresis must be less than high limit */
if (hysteresis > limit_c)
return EC_ERROR_INVAL;
if (tmp432_set_therm_mode() != EC_SUCCESS)
return EC_ERROR_UNKNOWN;
switch (channel) {
case TMP432_CHANNEL_LOCAL:
reg = TMP432_LOCAL_HIGH_LIMIT_W;
break;
case TMP432_CHANNEL_REMOTE1:
reg = TMP432_REMOTE1_HIGH_LIMIT_W;
break;
case TMP432_CHANNEL_REMOTE2:
reg = TMP432_REMOTE2_HIGH_LIMIT_W;
break;
}
ret = raw_write8(reg, limit_c);
if (ret)
return EC_ERROR_UNKNOWN;
ret = raw_write8(TMP432_THERM_HYSTERESIS, hysteresis);
if (ret)
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
static void temp_sensor_poll(void)
{
int temp_c;

31
driver/temp_sensor/tmp432.h
View File

@@ -67,6 +67,7 @@
/* Config register bits */
#define TMP432_CONFIG1_TEMP_RANGE (1 << 2)
/* TMP432_CONFIG1_MODE bit is use to enable THERM mode */
#define TMP432_CONFIG1_MODE (1 << 5)
#define TMP432_CONFIG1_RUN_L (1 << 6)
#define TMP432_CONFIG1_ALERT_MASK_L (1 << 7)
@@ -82,12 +83,24 @@
#define TMP432_STATUS_TEMP_HIGH_ALARM (1 << 4)
#define TMP432_STATUS_BUSY (1 << 7)
/* Limintaions */
#define TMP432_HYSTERESIS_HIGH_LIMIT 255
#define TMP432_HYSTERESIS_LOW_LIMIT 0
enum tmp432_power_state {
TMP432_POWER_OFF = 0,
TMP432_POWER_ON,
TMP432_POWER_COUNT
};
enum tmp432_channel_id {
TMP432_CHANNEL_LOCAL,
TMP432_CHANNEL_REMOTE1,
TMP432_CHANNEL_REMOTE2,
TMP432_CHANNEL_COUNT
};
/**
* Get the last polled value of a sensor.
*
@@ -108,4 +121,22 @@ int tmp432_get_val(int idx, int *temp_ptr);
* @return EC_SUCCESS if successful, non-zero if error.
*/
int tmp432_set_power(enum tmp432_power_state power_on);
/*
* Set TMP432 ALERT#/THERM2# pin to THERM mode, and give a limit
* for a specific channel.
*
* @param channel specific a channel
*
* @param limit_c High limit temperature, default: 85C
*
* @param hysteresis Hysteresis temperature, default: 10C
* All channels share the same hysteresis
*
* In THERM mode, ALERT# pin will trigger(Low) by itself when any
* channel's temperature is greater( >= )than channel's limit_c,
* and release(High) by itself when channel's temperature is lower
* than (limit_c - hysteresis)
*/
int tmp432_set_therm_limit(int channel, int limit_c, int hysteresis);
#endif /* __CROS_EC_TMP432_H */