rambi: Accelerometer driver for kxcj9.

Added accelerometer driver for kxcj9 accelerometers. Currently
the accelerometers aren't being used by anything, but there are
console commands, accelwrite and accelread, to perform transactions.

BUG=none
BRANCH=rambi
TEST=Used EC console commands to test that accelerometers respond
and data looks reasonable.

Original-Change-Id: I6ddcf04ec278adeacb148c19b10c3c296b467954
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/184693
Reviewed-by: Randall Spangler <rspangler@chromium.org>
(cherry picked from commit 5e1d2052b034b2400b98b2126243e01397a2ce56)

Conflicts:
	board/clapper/board.c
	board/clapper/board.h
	board/glimmer/board.c
	board/glimmer/board.h

Change-Id: If8744ddc3273fc08e29830adfd068dc302dd120a
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/187432
Reviewed-by: Randall Spangler <rspangler@chromium.org>

1 files changed, 132 insertions, 0 deletions

diff --git a/driver/accel_kxcj9.h b/driver/accel_kxcj9.h
new file mode 100644
index 0000000000..9451421be5
--- /dev/null
+++ b/driver/accel_kxcj9.h
@@ -0,0 +1,132 @@
+/* Copyright (c) 2014 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.
+ */
+
+/* KXCJ9 gsensor module for Chrome EC */
+
+#ifndef __CROS_EC_ACCEL_KXCJ9_H
+#define __CROS_EC_ACCEL_KXCJ9_H
+
+/*
+ * 7-bit address is 000111Xb. Where 'X' is determined
+ * by the voltage on the ADDR pin.
+ */
+#define KXCJ9_ADDR0		0x1c
+#define KXCJ9_ADDR1		0x1e
+
+/* Chip-specific registers */
+#define KXCJ9_XOUT_L		0x06
+#define KXCJ9_XOUT_H		0x07
+#define KXCJ9_YOUT_L		0x08
+#define KXCJ9_YOUT_H		0x09
+#define KXCJ9_ZOUT_L		0x0a
+#define KXCJ9_ZOUT_H		0x0b
+#define KXCJ9_DCST_RESP		0x0c
+#define KXCJ9_WHOAMI		0x0f
+#define KXCJ9_INT_SRC1		0x16
+#define KXCJ9_INT_SRC2		0x17
+#define KXCJ9_STATUS		0x18
+#define KXCJ9_INT_REL		0x1a
+#define KXCJ9_CTRL1		0x1b
+#define KXCJ9_CTRL2		0x1d
+#define KXCJ9_INT_CTRL1		0x1e
+#define KXCJ9_INT_CTRL2		0x1f
+#define KXCJ9_DATA_CTRL		0x21
+#define KXCJ9_WAKEUP_TIMER	0x29
+#define KXCJ9_SELF_TEST		0x3a
+#define KXCJ9_WAKEUP_THRESHOLD	0x6a
+
+#define KXCJ9_INT_SRC1_WUFS	(1 << 1)
+#define KXCJ9_INT_SRC1_DRDY	(1 << 4)
+
+#define KXCJ9_INT_SRC2_ZPWU	(1 << 0)
+#define KXCJ9_INT_SRC2_ZNWU	(1 << 1)
+#define KXCJ9_INT_SRC2_YPWU	(1 << 2)
+#define KXCJ9_INT_SRC2_YNWU	(1 << 3)
+#define KXCJ9_INT_SRC2_XPWU	(1 << 4)
+#define KXCJ9_INT_SRC2_XNWU	(1 << 5)
+
+#define KXCJ9_STATUS_INT	(1 << 4)
+
+#define KXCJ9_CTRL1_WUFE	(1 << 1)
+#define KXCJ9_CTRL1_DRDYE	(1 << 5)
+#define KXCJ9_CTRL1_PC1		(1 << 7)
+
+#define KXCJ9_GSEL_2G		(0 << 3)
+#define KXCJ9_GSEL_4G		(1 << 3)
+#define KXCJ9_GSEL_8G		(2 << 3)
+#define KXCJ9_GSEL_8G_14BIT	(3 << 3)
+
+#define KXCJ9_RES_8BIT		(0 << 6)
+#define KXCJ9_RES_12BIT		(1 << 6)
+
+#define KXCJ9_CTRL2_OWUF	(7 << 0)
+#define KXCJ9_CTRL2_DCST	(1 << 4)
+#define KXCJ9_CTRL2_SRST	(1 << 7)
+
+#define KXCJ9_OWUF_0_781HZ	0
+#define KXCJ9_OWUF_1_563HZ	1
+#define KXCJ9_OWUF_3_125HZ	2
+#define KXCJ9_OWUF_6_250HZ	3
+#define KXCJ9_OWUF_12_50HZ	4
+#define KXCJ9_OWUF_25_00HZ	5
+#define KXCJ9_OWUF_50_00HZ	6
+#define KXCJ9_OWUF_100_0HZ	7
+
+#define KXCJ9_INT_CTRL1_IEL		(1 << 3)
+#define KXCJ9_INT_CTRL1_IEA		(1 << 4)
+#define KXCJ9_INT_CTRL1_IEN		(1 << 5)
+
+#define KXCJ9_INT_CTRL2_ZPWUE		(1 << 0)
+#define KXCJ9_INT_CTRL2_ZNWUE		(1 << 1)
+#define KXCJ9_INT_CTRL2_YPWUE		(1 << 2)
+#define KXCJ9_INT_CTRL2_YNWUE		(1 << 3)
+#define KXCJ9_INT_CTRL2_XPWUE		(1 << 4)
+#define KXCJ9_INT_CTRL2_XNWUE		(1 << 5)
+
+#define KXCJ9_OSA_0_781HZ	8
+#define KXCJ9_OSA_1_563HZ	9
+#define KXCJ9_OSA_3_125HZ	0xa
+#define KXCJ9_OSA_6_250HZ	0xb
+#define KXCJ9_OSA_12_50HZ	0
+#define KXCJ9_OSA_25_00HZ	1
+#define KXCJ9_OSA_50_00HZ	2
+#define KXCJ9_OSA_100_0HZ	3
+#define KXCJ9_OSA_200_0HZ	4
+#define KXCJ9_OSA_400_0HZ	5
+#define KXCJ9_OSA_800_0HZ	6
+#define KXCJ9_OSA_1600_HZ	7
+
+
+/**
+ * Write the accelerometer range.
+ *
+ * @param id Target accelerometer
+ * @param range Range (KXCJ9_GSEL_*).
+ *
+ * @return EC_SUCCESS if successful, non-zero if error.
+ */
+int accel_write_range(const enum accel_id id, const int range);
+
+/**
+ * Write the accelerometer resolution.
+ *
+ * @param id Target accelerometer
+ * @param range Resolution (KXCJ9_RES_*).
+ *
+ * @return EC_SUCCESS if successful, non-zero if error.
+ */
+int accel_write_resolution(const enum accel_id id, const int res);
+
+/**
+ * Write the accelerometer data rate.
+ *
+ * @param id Target accelerometer
+ * @param range Data rate (KXCJ9_OSA_*).
+ *
+ * @return EC_SUCCESS if successful, non-zero if error.
+ */
+int accel_write_datarate(const enum accel_id id, const int rate);
+
+#endif /* __CROS_EC_ACCEL_KXCJ9_H */