Basic driver for tmp432 temperature sensor

This allows local and remote temp values to be added
to a board's list of temp sensors. It also adds a
'tmp432' EC console command to query temps
and set alert thresholds. Fractional degrees are not
supported. DPTF support is not addressed.

BUG=chrome-os-partner:23985
BRANCH=none
TEST=Add tmp432 support to a board with the sensor
then run the 'tmp432' and 'temps' EC console commands.

Signed-off-by: Dave Parker <dparker@chromium.org>

Change-Id: Ifee47cf4d4cf5eedef9ef2bfa2149f183f1d7a7b
Reviewed-on: https://chromium-review.googlesource.com/178688
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Dave Parker <dparker@chromium.org>
Tested-by: Dave Parker <dparker@chromium.org>

1 files changed, 96 insertions, 0 deletions

diff --git a/driver/temp_sensor/tmp432.h b/driver/temp_sensor/tmp432.h
new file mode 100644
index 0000000000..acfaf39503
--- /dev/null
+++ b/driver/temp_sensor/tmp432.h
@@ -0,0 +1,96 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* TMP432 temperature sensor module for Chrome EC */
+
+#ifndef __CROS_EC_TEMP_SENSOR_TMP432_H
+#define __CROS_EC_TEMP_SENSOR_TMP432_H
+
+#define TMP432_I2C_ADDR		0x98 /* 7-bit address is 0x4C */
+
+#define TMP432_IDX_LOCAL	0
+#define TMP432_IDX_REMOTE1	1
+#define TMP432_IDX_REMOTE2	2
+
+/* Chip-specific registers */
+#define TMP432_LOCAL			0x00
+#define TMP432_REMOTE1			0x01
+#define TMP432_STATUS			0x02
+#define TMP432_CONFIGURATION1_R		0x03
+#define TMP432_CONVERSION_RATE_R	0x04
+#define TMP432_LOCAL_HIGH_LIMIT_R	0x05
+#define TMP432_LOCAL_LOW_LIMIT_R	0x06
+#define TMP432_REMOTE1_HIGH_LIMIT_R	0x07
+#define TMP432_REMOTE1_LOW_LIMIT_R	0x08
+#define TMP432_CONFIGURATION1_W		0x09
+#define TMP432_CONVERSION_RATE_W	0x0a
+#define TMP432_LOCAL_HIGH_LIMIT_W	0x0b
+#define TMP432_LOCAL_LOW_LIMIT_W	0x0c
+#define TMP432_REMOTE1_HIGH_LIMIT_W	0x0d
+#define TMP432_REMOTE1_LOW_LIMIT_W	0x0e
+#define TMP432_ONESHOT			0x0f
+#define TMP432_REMOTE1_EXTD		0x10
+#define TMP432_REMOTE1_HIGH_LIMIT_EXTD	0x13
+#define TMP432_REMOTE1_LOW_LIMIT_EXTD	0x14
+#define TMP432_REMOTE2_HIGH_LIMIT_R	0x15
+#define TMP432_REMOTE2_HIGH_LIMIT_W	0x15
+#define TMP432_REMOTE2_LOW_LIMIT_R	0x16
+#define TMP432_REMOTE2_LOW_LIMIT_W	0x16
+#define TMP432_REMOTE2_HIGH_LIMIT_EXTD	0x17
+#define TMP432_REMOTE2_LOW_LIMIT_EXTD	0x18
+#define TMP432_REMOTE1_THERM_LIMIT	0x19
+#define TMP432_REMOTE2_THERM_LIMIT	0x1a
+#define TMP432_STATUS_FAULT		0x1b
+#define TMP432_CHANNEL_MASK		0x1f
+#define TMP432_LOCAL_THERM_LIMIT	0x20
+#define TMP432_THERM_HYSTERESIS		0x21
+#define TMP432_CONSECUTIVE_ALERT	0x22
+#define TMP432_REMOTE2			0x23
+#define TMP432_REMOTE2_EXTD		0x24
+#define TMP432_BETA_RANGE_CH1		0x25
+#define TMP432_BETA_RANGE_CH2		0x26
+#define TMP432_NFACTOR_REMOTE1		0x27
+#define TMP432_NFACTOR_REMOTE2		0x28
+#define TMP432_LOCAL_EXTD		0x29
+#define TMP432_STATUS_LIMIT_HIGH	0x35
+#define TMP432_STATUS_LIMIT_LOW		0x36
+#define TMP432_STATUS_THERM		0x37
+#define TMP432_LOCAL_HIGH_LIMIT_EXTD	0x3d
+#define TMP432_LOCAL_LOW_LIMIT_EXTD	0x3e
+#define TMP432_CONFIGURATION2_R		0x3f
+#define TMP432_CONFIGURATION2_W		0x3f
+#define TMP432_RESET_W			0xfc
+#define TMP432_DEVICE_ID		0xfd
+#define TMP432_MANUFACTURER_ID		0xfe
+
+/* Config register bits */
+#define TMP432_CONFIG1_TEMP_RANGE	(1 << 2)
+#define TMP432_CONFIG1_MODE		(1 << 5)
+#define TMP432_CONFIG1_RUN_L		(1 << 6)
+#define TMP432_CONFIG1_ALERT_MASK_L	(1 << 7)
+#define TMP432_CONFIG2_RESISTANCE_CORRECTION	(1 << 2)
+#define TMP432_CONFIG2_LOCAL_ENABLE	(1 << 3)
+#define TMP432_CONFIG2_REMOTE1_ENABLE	(1 << 4)
+#define TMP432_CONFIG2_REMOTE2_ENABLE	(1 << 5)
+
+/* Status register bits */
+#define TMP432_STATUS_TEMP_THERM_ALARM	(1 << 1)
+#define TMP432_STATUS_OPEN		(1 << 2)
+#define TMP432_STATUS_TEMP_LOW_ALARM	(1 << 3)
+#define TMP432_STATUS_TEMP_HIGH_ALARM	(1 << 4)
+#define TMP432_STATUS_BUSY		(1 << 7)
+
+/**
+ * Get the last polled value of a sensor.
+ *
+ * @param idx		Index to read. Idx indicates whether to read die
+ *			temperature or external temperature.
+ * @param temp_ptr	Destination for temperature in K.
+ *
+ * @return EC_SUCCESS if successful, non-zero if error.
+ */
+int tmp432_get_val(int idx, int *temp_ptr);
+
+#endif /* __CROS_EC_TEMP_SENSOR_TMP432_H */