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authorMichael Hennerich <michael.hennerich@analog.com>2010-06-25 08:44:10 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2010-06-25 08:55:07 -0700
commite27c729219ad24c8ac9a4b34cf192e56917565c5 (patch)
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parent69a4af606ed4836faa2ec69b1d217f384b8235e7 (diff)
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Input: add driver for ADXL345/346 Digital Accelerometers
This is a driver for the ADXL345/346 Three-Axis Digital Accelerometers. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Chris Verges <chrisv@cyberswitching.com> Signed-off-by: Luotao Fu <l.fu@pengutronix.de> Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'include')
-rw-r--r--include/linux/input/adxl34x.h293
1 files changed, 293 insertions, 0 deletions
diff --git a/include/linux/input/adxl34x.h b/include/linux/input/adxl34x.h
new file mode 100644
index 000000000000..712118238038
--- /dev/null
+++ b/include/linux/input/adxl34x.h
@@ -0,0 +1,293 @@
+/*
+ * include/linux/input/adxl34x.h
+ *
+ * Digital Accelerometer characteristics are highly application specific
+ * and may vary between boards and models. The platform_data for the
+ * device's "struct device" holds this information.
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __LINUX_INPUT_ADXL34X_H__
+#define __LINUX_INPUT_ADXL34X_H__
+
+struct adxl34x_platform_data {
+
+ /*
+ * X,Y,Z Axis Offset:
+ * offer user offset adjustments in twoscompliment
+ * form with a scale factor of 15.6 mg/LSB (i.e. 0x7F = +2 g)
+ */
+
+ s8 x_axis_offset;
+ s8 y_axis_offset;
+ s8 z_axis_offset;
+
+ /*
+ * TAP_X/Y/Z Enable: Setting TAP_X, Y, or Z Enable enables X,
+ * Y, or Z participation in Tap detection. A '0' excludes the
+ * selected axis from participation in Tap detection.
+ * Setting the SUPPRESS bit suppresses Double Tap detection if
+ * acceleration greater than tap_threshold is present between
+ * taps.
+ */
+
+#define ADXL_SUPPRESS (1 << 3)
+#define ADXL_TAP_X_EN (1 << 2)
+#define ADXL_TAP_Y_EN (1 << 1)
+#define ADXL_TAP_Z_EN (1 << 0)
+
+ u8 tap_axis_control;
+
+ /*
+ * tap_threshold:
+ * holds the threshold value for tap detection/interrupts.
+ * The data format is unsigned. The scale factor is 62.5 mg/LSB
+ * (i.e. 0xFF = +16 g). A zero value may result in undesirable
+ * behavior if Tap/Double Tap is enabled.
+ */
+
+ u8 tap_threshold;
+
+ /*
+ * tap_duration:
+ * is an unsigned time value representing the maximum
+ * time that an event must be above the tap_threshold threshold
+ * to qualify as a tap event. The scale factor is 625 us/LSB. A zero
+ * value will prevent Tap/Double Tap functions from working.
+ */
+
+ u8 tap_duration;
+
+ /*
+ * tap_latency:
+ * is an unsigned time value representing the wait time
+ * from the detection of a tap event to the opening of the time
+ * window tap_window for a possible second tap event. The scale
+ * factor is 1.25 ms/LSB. A zero value will disable the Double Tap
+ * function.
+ */
+
+ u8 tap_latency;
+
+ /*
+ * tap_window:
+ * is an unsigned time value representing the amount
+ * of time after the expiration of tap_latency during which a second
+ * tap can begin. The scale factor is 1.25 ms/LSB. A zero value will
+ * disable the Double Tap function.
+ */
+
+ u8 tap_window;
+
+ /*
+ * act_axis_control:
+ * X/Y/Z Enable: A '1' enables X, Y, or Z participation in activity
+ * or inactivity detection. A '0' excludes the selected axis from
+ * participation. If all of the axes are excluded, the function is
+ * disabled.
+ * AC/DC: A '0' = DC coupled operation and a '1' = AC coupled
+ * operation. In DC coupled operation, the current acceleration is
+ * compared with activity_threshold and inactivity_threshold directly
+ * to determine whether activity or inactivity is detected. In AC
+ * coupled operation for activity detection, the acceleration value
+ * at the start of activity detection is taken as a reference value.
+ * New samples of acceleration are then compared to this
+ * reference value and if the magnitude of the difference exceeds
+ * activity_threshold the device will trigger an activity interrupt. In
+ * AC coupled operation for inactivity detection, a reference value
+ * is used again for comparison and is updated whenever the
+ * device exceeds the inactivity threshold. Once the reference
+ * value is selected, the device compares the magnitude of the
+ * difference between the reference value and the current
+ * acceleration with inactivity_threshold. If the difference is below
+ * inactivity_threshold for a total of inactivity_time, the device is
+ * considered inactive and the inactivity interrupt is triggered.
+ */
+
+#define ADXL_ACT_ACDC (1 << 7)
+#define ADXL_ACT_X_EN (1 << 6)
+#define ADXL_ACT_Y_EN (1 << 5)
+#define ADXL_ACT_Z_EN (1 << 4)
+#define ADXL_INACT_ACDC (1 << 3)
+#define ADXL_INACT_X_EN (1 << 2)
+#define ADXL_INACT_Y_EN (1 << 1)
+#define ADXL_INACT_Z_EN (1 << 0)
+
+ u8 act_axis_control;
+
+ /*
+ * activity_threshold:
+ * holds the threshold value for activity detection.
+ * The data format is unsigned. The scale factor is
+ * 62.5 mg/LSB. A zero value may result in undesirable behavior if
+ * Activity interrupt is enabled.
+ */
+
+ u8 activity_threshold;
+
+ /*
+ * inactivity_threshold:
+ * holds the threshold value for inactivity
+ * detection. The data format is unsigned. The scale
+ * factor is 62.5 mg/LSB. A zero value may result in undesirable
+ * behavior if Inactivity interrupt is enabled.
+ */
+
+ u8 inactivity_threshold;
+
+ /*
+ * inactivity_time:
+ * is an unsigned time value representing the
+ * amount of time that acceleration must be below the value in
+ * inactivity_threshold for inactivity to be declared. The scale factor
+ * is 1 second/LSB. Unlike the other interrupt functions, which
+ * operate on unfiltered data, the inactivity function operates on the
+ * filtered output data. At least one output sample must be
+ * generated for the inactivity interrupt to be triggered. This will
+ * result in the function appearing un-responsive if the
+ * inactivity_time register is set with a value less than the time
+ * constant of the Output Data Rate. A zero value will result in an
+ * interrupt when the output data is below inactivity_threshold.
+ */
+
+ u8 inactivity_time;
+
+ /*
+ * free_fall_threshold:
+ * holds the threshold value for Free-Fall detection.
+ * The data format is unsigned. The root-sum-square(RSS) value
+ * of all axes is calculated and compared to the value in
+ * free_fall_threshold to determine if a free fall event may be
+ * occurring. The scale factor is 62.5 mg/LSB. A zero value may
+ * result in undesirable behavior if Free-Fall interrupt is
+ * enabled. Values between 300 and 600 mg (0x05 to 0x09) are
+ * recommended.
+ */
+
+ u8 free_fall_threshold;
+
+ /*
+ * free_fall_time:
+ * is an unsigned time value representing the minimum
+ * time that the RSS value of all axes must be less than
+ * free_fall_threshold to generate a Free-Fall interrupt. The
+ * scale factor is 5 ms/LSB. A zero value may result in
+ * undesirable behavior if Free-Fall interrupt is enabled.
+ * Values between 100 to 350 ms (0x14 to 0x46) are recommended.
+ */
+
+ u8 free_fall_time;
+
+ /*
+ * data_rate:
+ * Selects device bandwidth and output data rate.
+ * RATE = 3200 Hz / (2^(15 - x)). Default value is 0x0A, or 100 Hz
+ * Output Data Rate. An Output Data Rate should be selected that
+ * is appropriate for the communication protocol and frequency
+ * selected. Selecting too high of an Output Data Rate with a low
+ * communication speed will result in samples being discarded.
+ */
+
+ u8 data_rate;
+
+ /*
+ * data_range:
+ * FULL_RES: When this bit is set with the device is
+ * in Full-Resolution Mode, where the output resolution increases
+ * with RANGE to maintain a 4 mg/LSB scale factor. When this
+ * bit is cleared the device is in 10-bit Mode and RANGE determine the
+ * maximum g-Range and scale factor.
+ */
+
+#define ADXL_FULL_RES (1 << 3)
+#define ADXL_RANGE_PM_2g 0
+#define ADXL_RANGE_PM_4g 1
+#define ADXL_RANGE_PM_8g 2
+#define ADXL_RANGE_PM_16g 3
+
+ u8 data_range;
+
+ /*
+ * low_power_mode:
+ * A '0' = Normal operation and a '1' = Reduced
+ * power operation with somewhat higher noise.
+ */
+
+ u8 low_power_mode;
+
+ /*
+ * power_mode:
+ * LINK: A '1' with both the activity and inactivity functions
+ * enabled will delay the start of the activity function until
+ * inactivity is detected. Once activity is detected, inactivity
+ * detection will begin and prevent the detection of activity. This
+ * bit serially links the activity and inactivity functions. When '0'
+ * the inactivity and activity functions are concurrent. Additional
+ * information can be found in the Application section under Link
+ * Mode.
+ * AUTO_SLEEP: A '1' sets the ADXL34x to switch to Sleep Mode
+ * when inactivity (acceleration has been below inactivity_threshold
+ * for at least inactivity_time) is detected and the LINK bit is set.
+ * A '0' disables automatic switching to Sleep Mode. See SLEEP
+ * for further description.
+ */
+
+#define ADXL_LINK (1 << 5)
+#define ADXL_AUTO_SLEEP (1 << 4)
+
+ u8 power_mode;
+
+ /*
+ * fifo_mode:
+ * BYPASS The FIFO is bypassed
+ * FIFO FIFO collects up to 32 values then stops collecting data
+ * STREAM FIFO holds the last 32 data values. Once full, the FIFO's
+ * oldest data is lost as it is replaced with newer data
+ *
+ * DEFAULT should be ADXL_FIFO_STREAM
+ */
+
+#define ADXL_FIFO_BYPASS 0
+#define ADXL_FIFO_FIFO 1
+#define ADXL_FIFO_STREAM 2
+
+ u8 fifo_mode;
+
+ /*
+ * watermark:
+ * The Watermark feature can be used to reduce the interrupt load
+ * of the system. The FIFO fills up to the value stored in watermark
+ * [1..32] and then generates an interrupt.
+ * A '0' disables the watermark feature.
+ */
+
+ u8 watermark;
+
+ u32 ev_type; /* EV_ABS or EV_REL */
+
+ u32 ev_code_x; /* ABS_X,Y,Z or REL_X,Y,Z */
+ u32 ev_code_y; /* ABS_X,Y,Z or REL_X,Y,Z */
+ u32 ev_code_z; /* ABS_X,Y,Z or REL_X,Y,Z */
+
+ /*
+ * A valid BTN or KEY Code; use tap_axis_control to disable
+ * event reporting
+ */
+
+ u32 ev_code_tap[3]; /* EV_KEY {X-Axis, Y-Axis, Z-Axis} */
+
+ /*
+ * A valid BTN or KEY Code for Free-Fall or Activity enables
+ * input event reporting. A '0' disables the Free-Fall or
+ * Activity reporting.
+ */
+
+ u32 ev_code_ff; /* EV_KEY */
+ u32 ev_code_act_inactivity; /* EV_KEY */
+
+ u8 use_int2;
+};
+#endif