1572 строки
42 KiB
C
1572 строки
42 KiB
C
/*
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* sca3000_core.c -- support VTI sca3000 series accelerometers via SPI
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Copyright (c) 2009 Jonathan Cameron <jic23@kernel.org>
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*
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* See industrialio/accels/sca3000.h for comments.
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*/
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/kfifo_buf.h>
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#define SCA3000_WRITE_REG(a) (((a) << 2) | 0x02)
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#define SCA3000_READ_REG(a) ((a) << 2)
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#define SCA3000_REG_REVID_ADDR 0x00
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#define SCA3000_REG_REVID_MAJOR_MASK GENMASK(8, 4)
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#define SCA3000_REG_REVID_MINOR_MASK GENMASK(3, 0)
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#define SCA3000_REG_STATUS_ADDR 0x02
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#define SCA3000_LOCKED BIT(5)
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#define SCA3000_EEPROM_CS_ERROR BIT(1)
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#define SCA3000_SPI_FRAME_ERROR BIT(0)
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/* All reads done using register decrement so no need to directly access LSBs */
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#define SCA3000_REG_X_MSB_ADDR 0x05
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#define SCA3000_REG_Y_MSB_ADDR 0x07
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#define SCA3000_REG_Z_MSB_ADDR 0x09
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#define SCA3000_REG_RING_OUT_ADDR 0x0f
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/* Temp read untested - the e05 doesn't have the sensor */
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#define SCA3000_REG_TEMP_MSB_ADDR 0x13
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#define SCA3000_REG_MODE_ADDR 0x14
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#define SCA3000_MODE_PROT_MASK 0x28
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#define SCA3000_REG_MODE_RING_BUF_ENABLE BIT(7)
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#define SCA3000_REG_MODE_RING_BUF_8BIT BIT(6)
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/*
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* Free fall detection triggers an interrupt if the acceleration
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* is below a threshold for equivalent of 25cm drop
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*/
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#define SCA3000_REG_MODE_FREE_FALL_DETECT BIT(4)
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#define SCA3000_REG_MODE_MEAS_MODE_NORMAL 0x00
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#define SCA3000_REG_MODE_MEAS_MODE_OP_1 0x01
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#define SCA3000_REG_MODE_MEAS_MODE_OP_2 0x02
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/*
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* In motion detection mode the accelerations are band pass filtered
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* (approx 1 - 25Hz) and then a programmable threshold used to trigger
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* and interrupt.
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*/
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#define SCA3000_REG_MODE_MEAS_MODE_MOT_DET 0x03
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#define SCA3000_REG_MODE_MODE_MASK 0x03
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#define SCA3000_REG_BUF_COUNT_ADDR 0x15
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#define SCA3000_REG_INT_STATUS_ADDR 0x16
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#define SCA3000_REG_INT_STATUS_THREE_QUARTERS BIT(7)
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#define SCA3000_REG_INT_STATUS_HALF BIT(6)
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#define SCA3000_INT_STATUS_FREE_FALL BIT(3)
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#define SCA3000_INT_STATUS_Y_TRIGGER BIT(2)
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#define SCA3000_INT_STATUS_X_TRIGGER BIT(1)
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#define SCA3000_INT_STATUS_Z_TRIGGER BIT(0)
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/* Used to allow access to multiplexed registers */
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#define SCA3000_REG_CTRL_SEL_ADDR 0x18
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/* Only available for SCA3000-D03 and SCA3000-D01 */
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#define SCA3000_REG_CTRL_SEL_I2C_DISABLE 0x01
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#define SCA3000_REG_CTRL_SEL_MD_CTRL 0x02
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#define SCA3000_REG_CTRL_SEL_MD_Y_TH 0x03
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#define SCA3000_REG_CTRL_SEL_MD_X_TH 0x04
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#define SCA3000_REG_CTRL_SEL_MD_Z_TH 0x05
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/*
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* BE VERY CAREFUL WITH THIS, IF 3 BITS ARE NOT SET the device
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* will not function
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*/
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#define SCA3000_REG_CTRL_SEL_OUT_CTRL 0x0B
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#define SCA3000_REG_OUT_CTRL_PROT_MASK 0xE0
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#define SCA3000_REG_OUT_CTRL_BUF_X_EN 0x10
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#define SCA3000_REG_OUT_CTRL_BUF_Y_EN 0x08
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#define SCA3000_REG_OUT_CTRL_BUF_Z_EN 0x04
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#define SCA3000_REG_OUT_CTRL_BUF_DIV_MASK 0x03
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#define SCA3000_REG_OUT_CTRL_BUF_DIV_4 0x02
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#define SCA3000_REG_OUT_CTRL_BUF_DIV_2 0x01
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/*
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* Control which motion detector interrupts are on.
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* For now only OR combinations are supported.
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*/
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#define SCA3000_MD_CTRL_PROT_MASK 0xC0
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#define SCA3000_MD_CTRL_OR_Y BIT(0)
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#define SCA3000_MD_CTRL_OR_X BIT(1)
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#define SCA3000_MD_CTRL_OR_Z BIT(2)
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/* Currently unsupported */
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#define SCA3000_MD_CTRL_AND_Y BIT(3)
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#define SCA3000_MD_CTRL_AND_X BIT(4)
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#define SAC3000_MD_CTRL_AND_Z BIT(5)
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/*
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* Some control registers of complex access methods requiring this register to
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* be used to remove a lock.
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*/
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#define SCA3000_REG_UNLOCK_ADDR 0x1e
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#define SCA3000_REG_INT_MASK_ADDR 0x21
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#define SCA3000_REG_INT_MASK_PROT_MASK 0x1C
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#define SCA3000_REG_INT_MASK_RING_THREE_QUARTER BIT(7)
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#define SCA3000_REG_INT_MASK_RING_HALF BIT(6)
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#define SCA3000_REG_INT_MASK_ALL_INTS 0x02
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#define SCA3000_REG_INT_MASK_ACTIVE_HIGH 0x01
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#define SCA3000_REG_INT_MASK_ACTIVE_LOW 0x00
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/* Values of multiplexed registers (write to ctrl_data after select) */
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#define SCA3000_REG_CTRL_DATA_ADDR 0x22
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/*
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* Measurement modes available on some sca3000 series chips. Code assumes others
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* may become available in the future.
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*
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* Bypass - Bypass the low-pass filter in the signal channel so as to increase
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* signal bandwidth.
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*
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* Narrow - Narrow low-pass filtering of the signal channel and half output
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* data rate by decimation.
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*
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* Wide - Widen low-pass filtering of signal channel to increase bandwidth
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*/
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#define SCA3000_OP_MODE_BYPASS 0x01
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#define SCA3000_OP_MODE_NARROW 0x02
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#define SCA3000_OP_MODE_WIDE 0x04
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#define SCA3000_MAX_TX 6
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#define SCA3000_MAX_RX 2
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/**
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* struct sca3000_state - device instance state information
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* @us: the associated spi device
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* @info: chip variant information
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* @last_timestamp: the timestamp of the last event
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* @mo_det_use_count: reference counter for the motion detection unit
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* @lock: lock used to protect elements of sca3000_state
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* and the underlying device state.
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* @tx: dma-able transmit buffer
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* @rx: dma-able receive buffer
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**/
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struct sca3000_state {
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struct spi_device *us;
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const struct sca3000_chip_info *info;
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s64 last_timestamp;
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int mo_det_use_count;
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struct mutex lock;
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/* Can these share a cacheline ? */
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u8 rx[384] ____cacheline_aligned;
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u8 tx[6] ____cacheline_aligned;
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};
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/**
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* struct sca3000_chip_info - model dependent parameters
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* @scale: scale * 10^-6
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* @temp_output: some devices have temperature sensors.
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* @measurement_mode_freq: normal mode sampling frequency
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* @measurement_mode_3db_freq: 3db cutoff frequency of the low pass filter for
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* the normal measurement mode.
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* @option_mode_1: first optional mode. Not all models have one
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* @option_mode_1_freq: option mode 1 sampling frequency
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* @option_mode_1_3db_freq: 3db cutoff frequency of the low pass filter for
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* the first option mode.
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* @option_mode_2: second optional mode. Not all chips have one
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* @option_mode_2_freq: option mode 2 sampling frequency
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* @option_mode_2_3db_freq: 3db cutoff frequency of the low pass filter for
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* the second option mode.
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* @mod_det_mult_xz: Bit wise multipliers to calculate the threshold
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* for motion detection in the x and z axis.
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* @mod_det_mult_y: Bit wise multipliers to calculate the threshold
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* for motion detection in the y axis.
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*
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* This structure is used to hold information about the functionality of a given
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* sca3000 variant.
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**/
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struct sca3000_chip_info {
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unsigned int scale;
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bool temp_output;
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int measurement_mode_freq;
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int measurement_mode_3db_freq;
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int option_mode_1;
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int option_mode_1_freq;
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int option_mode_1_3db_freq;
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int option_mode_2;
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int option_mode_2_freq;
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int option_mode_2_3db_freq;
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int mot_det_mult_xz[6];
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int mot_det_mult_y[7];
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};
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enum sca3000_variant {
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d01,
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e02,
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e04,
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e05,
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};
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/*
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* Note where option modes are not defined, the chip simply does not
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* support any.
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* Other chips in the sca3000 series use i2c and are not included here.
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*
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* Some of these devices are only listed in the family data sheet and
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* do not actually appear to be available.
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*/
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static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = {
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[d01] = {
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.scale = 7357,
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.temp_output = true,
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.measurement_mode_freq = 250,
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.measurement_mode_3db_freq = 45,
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.option_mode_1 = SCA3000_OP_MODE_BYPASS,
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.option_mode_1_freq = 250,
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.option_mode_1_3db_freq = 70,
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.mot_det_mult_xz = {50, 100, 200, 350, 650, 1300},
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.mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750},
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},
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[e02] = {
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.scale = 9810,
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.measurement_mode_freq = 125,
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.measurement_mode_3db_freq = 40,
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.option_mode_1 = SCA3000_OP_MODE_NARROW,
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.option_mode_1_freq = 63,
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.option_mode_1_3db_freq = 11,
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.mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050},
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.mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700},
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},
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[e04] = {
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.scale = 19620,
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.measurement_mode_freq = 100,
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.measurement_mode_3db_freq = 38,
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.option_mode_1 = SCA3000_OP_MODE_NARROW,
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.option_mode_1_freq = 50,
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.option_mode_1_3db_freq = 9,
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.option_mode_2 = SCA3000_OP_MODE_WIDE,
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.option_mode_2_freq = 400,
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.option_mode_2_3db_freq = 70,
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.mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100},
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.mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000},
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},
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[e05] = {
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.scale = 61313,
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.measurement_mode_freq = 200,
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.measurement_mode_3db_freq = 60,
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.option_mode_1 = SCA3000_OP_MODE_NARROW,
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.option_mode_1_freq = 50,
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.option_mode_1_3db_freq = 9,
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.option_mode_2 = SCA3000_OP_MODE_WIDE,
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.option_mode_2_freq = 400,
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.option_mode_2_3db_freq = 75,
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.mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900},
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.mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600},
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},
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};
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static int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val)
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{
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st->tx[0] = SCA3000_WRITE_REG(address);
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st->tx[1] = val;
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return spi_write(st->us, st->tx, 2);
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}
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static int sca3000_read_data_short(struct sca3000_state *st,
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u8 reg_address_high,
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int len)
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{
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struct spi_transfer xfer[2] = {
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{
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.len = 1,
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.tx_buf = st->tx,
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}, {
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.len = len,
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.rx_buf = st->rx,
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}
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};
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st->tx[0] = SCA3000_READ_REG(reg_address_high);
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return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
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}
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/**
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* sca3000_reg_lock_on() - test if the ctrl register lock is on
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* @st: Driver specific device instance data.
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*
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* Lock must be held.
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**/
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static int sca3000_reg_lock_on(struct sca3000_state *st)
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{
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int ret;
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ret = sca3000_read_data_short(st, SCA3000_REG_STATUS_ADDR, 1);
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if (ret < 0)
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return ret;
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return !(st->rx[0] & SCA3000_LOCKED);
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}
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/**
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* __sca3000_unlock_reg_lock() - unlock the control registers
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* @st: Driver specific device instance data.
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*
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* Note the device does not appear to support doing this in a single transfer.
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* This should only ever be used as part of ctrl reg read.
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* Lock must be held before calling this
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*/
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static int __sca3000_unlock_reg_lock(struct sca3000_state *st)
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{
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struct spi_transfer xfer[3] = {
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{
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.len = 2,
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.cs_change = 1,
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.tx_buf = st->tx,
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}, {
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.len = 2,
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.cs_change = 1,
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.tx_buf = st->tx + 2,
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}, {
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.len = 2,
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.tx_buf = st->tx + 4,
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},
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};
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st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
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st->tx[1] = 0x00;
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st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
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st->tx[3] = 0x50;
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st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
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st->tx[5] = 0xA0;
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return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
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}
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/**
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* sca3000_write_ctrl_reg() write to a lock protect ctrl register
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* @st: Driver specific device instance data.
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* @sel: selects which registers we wish to write to
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* @val: the value to be written
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*
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* Certain control registers are protected against overwriting by the lock
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* register and use a shared write address. This function allows writing of
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* these registers.
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* Lock must be held.
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*/
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static int sca3000_write_ctrl_reg(struct sca3000_state *st,
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u8 sel,
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uint8_t val)
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{
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int ret;
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ret = sca3000_reg_lock_on(st);
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if (ret < 0)
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goto error_ret;
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if (ret) {
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ret = __sca3000_unlock_reg_lock(st);
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if (ret)
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goto error_ret;
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}
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/* Set the control select register */
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ret = sca3000_write_reg(st, SCA3000_REG_CTRL_SEL_ADDR, sel);
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if (ret)
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goto error_ret;
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/* Write the actual value into the register */
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ret = sca3000_write_reg(st, SCA3000_REG_CTRL_DATA_ADDR, val);
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error_ret:
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return ret;
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}
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/**
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* sca3000_read_ctrl_reg() read from lock protected control register.
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* @st: Driver specific device instance data.
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* @ctrl_reg: Which ctrl register do we want to read.
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*
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* Lock must be held.
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*/
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static int sca3000_read_ctrl_reg(struct sca3000_state *st,
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u8 ctrl_reg)
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{
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int ret;
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ret = sca3000_reg_lock_on(st);
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if (ret < 0)
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goto error_ret;
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if (ret) {
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ret = __sca3000_unlock_reg_lock(st);
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if (ret)
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goto error_ret;
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}
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/* Set the control select register */
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ret = sca3000_write_reg(st, SCA3000_REG_CTRL_SEL_ADDR, ctrl_reg);
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if (ret)
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goto error_ret;
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ret = sca3000_read_data_short(st, SCA3000_REG_CTRL_DATA_ADDR, 1);
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if (ret)
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goto error_ret;
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return st->rx[0];
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error_ret:
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return ret;
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}
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/**
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* sca3000_show_rev() - sysfs interface to read the chip revision number
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* @indio_dev: Device instance specific generic IIO data.
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* Driver specific device instance data can be obtained via
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* via iio_priv(indio_dev)
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*/
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static int sca3000_print_rev(struct iio_dev *indio_dev)
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{
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int ret;
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struct sca3000_state *st = iio_priv(indio_dev);
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mutex_lock(&st->lock);
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ret = sca3000_read_data_short(st, SCA3000_REG_REVID_ADDR, 1);
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if (ret < 0)
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goto error_ret;
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dev_info(&indio_dev->dev,
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"sca3000 revision major=%lu, minor=%lu\n",
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st->rx[0] & SCA3000_REG_REVID_MAJOR_MASK,
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st->rx[0] & SCA3000_REG_REVID_MINOR_MASK);
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error_ret:
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mutex_unlock(&st->lock);
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return ret;
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}
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static ssize_t
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sca3000_show_available_3db_freqs(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct sca3000_state *st = iio_priv(indio_dev);
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int len;
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len = sprintf(buf, "%d", st->info->measurement_mode_3db_freq);
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if (st->info->option_mode_1)
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len += sprintf(buf + len, " %d",
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st->info->option_mode_1_3db_freq);
|
|
if (st->info->option_mode_2)
|
|
len += sprintf(buf + len, " %d",
|
|
st->info->option_mode_2_3db_freq);
|
|
len += sprintf(buf + len, "\n");
|
|
|
|
return len;
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
|
|
S_IRUGO, sca3000_show_available_3db_freqs,
|
|
NULL, 0);
|
|
|
|
static const struct iio_event_spec sca3000_event = {
|
|
.type = IIO_EV_TYPE_MAG,
|
|
.dir = IIO_EV_DIR_RISING,
|
|
.mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
|
|
};
|
|
|
|
/*
|
|
* Note the hack in the number of bits to pretend we have 2 more than
|
|
* we do in the fifo.
|
|
*/
|
|
#define SCA3000_CHAN(index, mod) \
|
|
{ \
|
|
.type = IIO_ACCEL, \
|
|
.modified = 1, \
|
|
.channel2 = mod, \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |\
|
|
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),\
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
|
|
.address = index, \
|
|
.scan_index = index, \
|
|
.scan_type = { \
|
|
.sign = 's', \
|
|
.realbits = 13, \
|
|
.storagebits = 16, \
|
|
.shift = 3, \
|
|
.endianness = IIO_BE, \
|
|
}, \
|
|
.event_spec = &sca3000_event, \
|
|
.num_event_specs = 1, \
|
|
}
|
|
|
|
static const struct iio_event_spec sca3000_freefall_event_spec = {
|
|
.type = IIO_EV_TYPE_MAG,
|
|
.dir = IIO_EV_DIR_FALLING,
|
|
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
|
|
BIT(IIO_EV_INFO_PERIOD),
|
|
};
|
|
|
|
static const struct iio_chan_spec sca3000_channels[] = {
|
|
SCA3000_CHAN(0, IIO_MOD_X),
|
|
SCA3000_CHAN(1, IIO_MOD_Y),
|
|
SCA3000_CHAN(2, IIO_MOD_Z),
|
|
{
|
|
.type = IIO_ACCEL,
|
|
.modified = 1,
|
|
.channel2 = IIO_MOD_X_AND_Y_AND_Z,
|
|
.scan_index = -1, /* Fake channel */
|
|
.event_spec = &sca3000_freefall_event_spec,
|
|
.num_event_specs = 1,
|
|
},
|
|
};
|
|
|
|
static const struct iio_chan_spec sca3000_channels_with_temp[] = {
|
|
SCA3000_CHAN(0, IIO_MOD_X),
|
|
SCA3000_CHAN(1, IIO_MOD_Y),
|
|
SCA3000_CHAN(2, IIO_MOD_Z),
|
|
{
|
|
.type = IIO_TEMP,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
|
|
BIT(IIO_CHAN_INFO_OFFSET),
|
|
/* No buffer support */
|
|
.scan_index = -1,
|
|
},
|
|
{
|
|
.type = IIO_ACCEL,
|
|
.modified = 1,
|
|
.channel2 = IIO_MOD_X_AND_Y_AND_Z,
|
|
.scan_index = -1, /* Fake channel */
|
|
.event_spec = &sca3000_freefall_event_spec,
|
|
.num_event_specs = 1,
|
|
},
|
|
};
|
|
|
|
static u8 sca3000_addresses[3][3] = {
|
|
[0] = {SCA3000_REG_X_MSB_ADDR, SCA3000_REG_CTRL_SEL_MD_X_TH,
|
|
SCA3000_MD_CTRL_OR_X},
|
|
[1] = {SCA3000_REG_Y_MSB_ADDR, SCA3000_REG_CTRL_SEL_MD_Y_TH,
|
|
SCA3000_MD_CTRL_OR_Y},
|
|
[2] = {SCA3000_REG_Z_MSB_ADDR, SCA3000_REG_CTRL_SEL_MD_Z_TH,
|
|
SCA3000_MD_CTRL_OR_Z},
|
|
};
|
|
|
|
/**
|
|
* __sca3000_get_base_freq() - obtain mode specific base frequency
|
|
* @st: Private driver specific device instance specific state.
|
|
* @info: chip type specific information.
|
|
* @base_freq: Base frequency for the current measurement mode.
|
|
*
|
|
* lock must be held
|
|
*/
|
|
static inline int __sca3000_get_base_freq(struct sca3000_state *st,
|
|
const struct sca3000_chip_info *info,
|
|
int *base_freq)
|
|
{
|
|
int ret;
|
|
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
switch (SCA3000_REG_MODE_MODE_MASK & st->rx[0]) {
|
|
case SCA3000_REG_MODE_MEAS_MODE_NORMAL:
|
|
*base_freq = info->measurement_mode_freq;
|
|
break;
|
|
case SCA3000_REG_MODE_MEAS_MODE_OP_1:
|
|
*base_freq = info->option_mode_1_freq;
|
|
break;
|
|
case SCA3000_REG_MODE_MEAS_MODE_OP_2:
|
|
*base_freq = info->option_mode_2_freq;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sca3000_read_raw_samp_freq() - read_raw handler for IIO_CHAN_INFO_SAMP_FREQ
|
|
* @st: Private driver specific device instance specific state.
|
|
* @val: The frequency read back.
|
|
*
|
|
* lock must be held
|
|
**/
|
|
static int sca3000_read_raw_samp_freq(struct sca3000_state *st, int *val)
|
|
{
|
|
int ret;
|
|
|
|
ret = __sca3000_get_base_freq(st, st->info, val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (*val > 0) {
|
|
ret &= SCA3000_REG_OUT_CTRL_BUF_DIV_MASK;
|
|
switch (ret) {
|
|
case SCA3000_REG_OUT_CTRL_BUF_DIV_2:
|
|
*val /= 2;
|
|
break;
|
|
case SCA3000_REG_OUT_CTRL_BUF_DIV_4:
|
|
*val /= 4;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sca3000_write_raw_samp_freq() - write_raw handler for IIO_CHAN_INFO_SAMP_FREQ
|
|
* @st: Private driver specific device instance specific state.
|
|
* @val: The frequency desired.
|
|
*
|
|
* lock must be held
|
|
*/
|
|
static int sca3000_write_raw_samp_freq(struct sca3000_state *st, int val)
|
|
{
|
|
int ret, base_freq, ctrlval;
|
|
|
|
ret = __sca3000_get_base_freq(st, st->info, &base_freq);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ctrlval = ret & ~SCA3000_REG_OUT_CTRL_BUF_DIV_MASK;
|
|
|
|
if (val == base_freq / 2)
|
|
ctrlval |= SCA3000_REG_OUT_CTRL_BUF_DIV_2;
|
|
if (val == base_freq / 4)
|
|
ctrlval |= SCA3000_REG_OUT_CTRL_BUF_DIV_4;
|
|
else if (val != base_freq)
|
|
return -EINVAL;
|
|
|
|
return sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
|
|
ctrlval);
|
|
}
|
|
|
|
static int sca3000_read_3db_freq(struct sca3000_state *st, int *val)
|
|
{
|
|
int ret;
|
|
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* mask bottom 2 bits - only ones that are relevant */
|
|
st->rx[0] &= SCA3000_REG_MODE_MODE_MASK;
|
|
switch (st->rx[0]) {
|
|
case SCA3000_REG_MODE_MEAS_MODE_NORMAL:
|
|
*val = st->info->measurement_mode_3db_freq;
|
|
return IIO_VAL_INT;
|
|
case SCA3000_REG_MODE_MEAS_MODE_MOT_DET:
|
|
return -EBUSY;
|
|
case SCA3000_REG_MODE_MEAS_MODE_OP_1:
|
|
*val = st->info->option_mode_1_3db_freq;
|
|
return IIO_VAL_INT;
|
|
case SCA3000_REG_MODE_MEAS_MODE_OP_2:
|
|
*val = st->info->option_mode_2_3db_freq;
|
|
return IIO_VAL_INT;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int sca3000_write_3db_freq(struct sca3000_state *st, int val)
|
|
{
|
|
int ret;
|
|
int mode;
|
|
|
|
if (val == st->info->measurement_mode_3db_freq)
|
|
mode = SCA3000_REG_MODE_MEAS_MODE_NORMAL;
|
|
else if (st->info->option_mode_1 &&
|
|
(val == st->info->option_mode_1_3db_freq))
|
|
mode = SCA3000_REG_MODE_MEAS_MODE_OP_1;
|
|
else if (st->info->option_mode_2 &&
|
|
(val == st->info->option_mode_2_3db_freq))
|
|
mode = SCA3000_REG_MODE_MEAS_MODE_OP_2;
|
|
else
|
|
return -EINVAL;
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
st->rx[0] &= ~SCA3000_REG_MODE_MODE_MASK;
|
|
st->rx[0] |= (mode & SCA3000_REG_MODE_MODE_MASK);
|
|
|
|
return sca3000_write_reg(st, SCA3000_REG_MODE_ADDR, st->rx[0]);
|
|
}
|
|
|
|
static int sca3000_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val,
|
|
int *val2,
|
|
long mask)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
u8 address;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
mutex_lock(&st->lock);
|
|
if (chan->type == IIO_ACCEL) {
|
|
if (st->mo_det_use_count) {
|
|
mutex_unlock(&st->lock);
|
|
return -EBUSY;
|
|
}
|
|
address = sca3000_addresses[chan->address][0];
|
|
ret = sca3000_read_data_short(st, address, 2);
|
|
if (ret < 0) {
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
*val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF;
|
|
*val = ((*val) << (sizeof(*val) * 8 - 13)) >>
|
|
(sizeof(*val) * 8 - 13);
|
|
} else {
|
|
/* get the temperature when available */
|
|
ret = sca3000_read_data_short(st,
|
|
SCA3000_REG_TEMP_MSB_ADDR,
|
|
2);
|
|
if (ret < 0) {
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
*val = ((st->rx[0] & 0x3F) << 3) |
|
|
((st->rx[1] & 0xE0) >> 5);
|
|
}
|
|
mutex_unlock(&st->lock);
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
*val = 0;
|
|
if (chan->type == IIO_ACCEL)
|
|
*val2 = st->info->scale;
|
|
else /* temperature */
|
|
*val2 = 555556;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_CHAN_INFO_OFFSET:
|
|
*val = -214;
|
|
*val2 = 600000;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_raw_samp_freq(st, val);
|
|
mutex_unlock(&st->lock);
|
|
return ret ? ret : IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_3db_freq(st, val);
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int sca3000_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
if (val2)
|
|
return -EINVAL;
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_write_raw_samp_freq(st, val);
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
|
|
if (val2)
|
|
return -EINVAL;
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_write_3db_freq(st, val);
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sca3000_read_av_freq() - sysfs function to get available frequencies
|
|
* @dev: Device structure for this device.
|
|
* @attr: Description of the attribute.
|
|
* @buf: Incoming string
|
|
*
|
|
* The later modes are only relevant to the ring buffer - and depend on current
|
|
* mode. Note that data sheet gives rather wide tolerances for these so integer
|
|
* division will give good enough answer and not all chips have them specified
|
|
* at all.
|
|
**/
|
|
static ssize_t sca3000_read_av_freq(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int len = 0, ret, val;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
val = st->rx[0];
|
|
mutex_unlock(&st->lock);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
switch (val & SCA3000_REG_MODE_MODE_MASK) {
|
|
case SCA3000_REG_MODE_MEAS_MODE_NORMAL:
|
|
len += sprintf(buf + len, "%d %d %d\n",
|
|
st->info->measurement_mode_freq,
|
|
st->info->measurement_mode_freq / 2,
|
|
st->info->measurement_mode_freq / 4);
|
|
break;
|
|
case SCA3000_REG_MODE_MEAS_MODE_OP_1:
|
|
len += sprintf(buf + len, "%d %d %d\n",
|
|
st->info->option_mode_1_freq,
|
|
st->info->option_mode_1_freq / 2,
|
|
st->info->option_mode_1_freq / 4);
|
|
break;
|
|
case SCA3000_REG_MODE_MEAS_MODE_OP_2:
|
|
len += sprintf(buf + len, "%d %d %d\n",
|
|
st->info->option_mode_2_freq,
|
|
st->info->option_mode_2_freq / 2,
|
|
st->info->option_mode_2_freq / 4);
|
|
break;
|
|
}
|
|
return len;
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Should only really be registered if ring buffer support is compiled in.
|
|
* Does no harm however and doing it right would add a fair bit of complexity
|
|
*/
|
|
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq);
|
|
|
|
/**
|
|
* sca3000_read_event_value() - query of a threshold or period
|
|
**/
|
|
static int sca3000_read_event_value(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
enum iio_event_info info,
|
|
int *val, int *val2)
|
|
{
|
|
int ret, i;
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
|
|
switch (info) {
|
|
case IIO_EV_INFO_VALUE:
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_ctrl_reg(st,
|
|
sca3000_addresses[chan->address][1]);
|
|
mutex_unlock(&st->lock);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = 0;
|
|
if (chan->channel2 == IIO_MOD_Y)
|
|
for_each_set_bit(i, (unsigned long *)&ret,
|
|
ARRAY_SIZE(st->info->mot_det_mult_y))
|
|
*val += st->info->mot_det_mult_y[i];
|
|
else
|
|
for_each_set_bit(i, (unsigned long *)&ret,
|
|
ARRAY_SIZE(st->info->mot_det_mult_xz))
|
|
*val += st->info->mot_det_mult_xz[i];
|
|
|
|
return IIO_VAL_INT;
|
|
case IIO_EV_INFO_PERIOD:
|
|
*val = 0;
|
|
*val2 = 226000;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* sca3000_write_value() - control of threshold and period
|
|
* @indio_dev: Device instance specific IIO information.
|
|
* @chan: Description of the channel for which the event is being
|
|
* configured.
|
|
* @type: The type of event being configured, here magnitude rising
|
|
* as everything else is read only.
|
|
* @dir: Direction of the event (here rising)
|
|
* @info: What information about the event are we configuring.
|
|
* Here the threshold only.
|
|
* @val: Integer part of the value being written..
|
|
* @val2: Non integer part of the value being written. Here always 0.
|
|
*/
|
|
static int sca3000_write_event_value(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
enum iio_event_info info,
|
|
int val, int val2)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
int i;
|
|
u8 nonlinear = 0;
|
|
|
|
if (chan->channel2 == IIO_MOD_Y) {
|
|
i = ARRAY_SIZE(st->info->mot_det_mult_y);
|
|
while (i > 0)
|
|
if (val >= st->info->mot_det_mult_y[--i]) {
|
|
nonlinear |= (1 << i);
|
|
val -= st->info->mot_det_mult_y[i];
|
|
}
|
|
} else {
|
|
i = ARRAY_SIZE(st->info->mot_det_mult_xz);
|
|
while (i > 0)
|
|
if (val >= st->info->mot_det_mult_xz[--i]) {
|
|
nonlinear |= (1 << i);
|
|
val -= st->info->mot_det_mult_xz[i];
|
|
}
|
|
}
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_write_ctrl_reg(st,
|
|
sca3000_addresses[chan->address][1],
|
|
nonlinear);
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct attribute *sca3000_attributes[] = {
|
|
&iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
|
|
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group sca3000_attribute_group = {
|
|
.attrs = sca3000_attributes,
|
|
};
|
|
|
|
static int sca3000_read_data(struct sca3000_state *st,
|
|
u8 reg_address_high,
|
|
u8 *rx,
|
|
int len)
|
|
{
|
|
int ret;
|
|
struct spi_transfer xfer[2] = {
|
|
{
|
|
.len = 1,
|
|
.tx_buf = st->tx,
|
|
}, {
|
|
.len = len,
|
|
.rx_buf = rx,
|
|
}
|
|
};
|
|
|
|
st->tx[0] = SCA3000_READ_REG(reg_address_high);
|
|
ret = spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
|
|
if (ret) {
|
|
dev_err(get_device(&st->us->dev), "problem reading register");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sca3000_ring_int_process() - ring specific interrupt handling.
|
|
* @val: Value of the interrupt status register.
|
|
* @indio_dev: Device instance specific IIO device structure.
|
|
*/
|
|
static void sca3000_ring_int_process(u8 val, struct iio_dev *indio_dev)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret, i, num_available;
|
|
|
|
mutex_lock(&st->lock);
|
|
|
|
if (val & SCA3000_REG_INT_STATUS_HALF) {
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_BUF_COUNT_ADDR,
|
|
1);
|
|
if (ret)
|
|
goto error_ret;
|
|
num_available = st->rx[0];
|
|
/*
|
|
* num_available is the total number of samples available
|
|
* i.e. number of time points * number of channels.
|
|
*/
|
|
ret = sca3000_read_data(st, SCA3000_REG_RING_OUT_ADDR, st->rx,
|
|
num_available * 2);
|
|
if (ret)
|
|
goto error_ret;
|
|
for (i = 0; i < num_available / 3; i++) {
|
|
/*
|
|
* Dirty hack to cover for 11 bit in fifo, 13 bit
|
|
* direct reading.
|
|
*
|
|
* In theory the bottom two bits are undefined.
|
|
* In reality they appear to always be 0.
|
|
*/
|
|
iio_push_to_buffers(indio_dev, st->rx + i * 3 * 2);
|
|
}
|
|
}
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
}
|
|
|
|
/**
|
|
* sca3000_event_handler() - handling ring and non ring events
|
|
* @irq: The irq being handled.
|
|
* @private: struct iio_device pointer for the device.
|
|
*
|
|
* Ring related interrupt handler. Depending on event, push to
|
|
* the ring buffer event chrdev or the event one.
|
|
*
|
|
* This function is complicated by the fact that the devices can signify ring
|
|
* and non ring events via the same interrupt line and they can only
|
|
* be distinguished via a read of the relevant status register.
|
|
*/
|
|
static irqreturn_t sca3000_event_handler(int irq, void *private)
|
|
{
|
|
struct iio_dev *indio_dev = private;
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret, val;
|
|
s64 last_timestamp = iio_get_time_ns(indio_dev);
|
|
|
|
/*
|
|
* Could lead if badly timed to an extra read of status reg,
|
|
* but ensures no interrupt is missed.
|
|
*/
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_INT_STATUS_ADDR, 1);
|
|
val = st->rx[0];
|
|
mutex_unlock(&st->lock);
|
|
if (ret)
|
|
goto done;
|
|
|
|
sca3000_ring_int_process(val, indio_dev);
|
|
|
|
if (val & SCA3000_INT_STATUS_FREE_FALL)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_X_AND_Y_AND_Z,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_FALLING),
|
|
last_timestamp);
|
|
|
|
if (val & SCA3000_INT_STATUS_Y_TRIGGER)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_Y,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
last_timestamp);
|
|
|
|
if (val & SCA3000_INT_STATUS_X_TRIGGER)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_X,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
last_timestamp);
|
|
|
|
if (val & SCA3000_INT_STATUS_Z_TRIGGER)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_Z,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
last_timestamp);
|
|
|
|
done:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* sca3000_read_event_config() what events are enabled
|
|
**/
|
|
static int sca3000_read_event_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
/* read current value of mode register */
|
|
mutex_lock(&st->lock);
|
|
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
switch (chan->channel2) {
|
|
case IIO_MOD_X_AND_Y_AND_Z:
|
|
ret = !!(st->rx[0] & SCA3000_REG_MODE_FREE_FALL_DETECT);
|
|
break;
|
|
case IIO_MOD_X:
|
|
case IIO_MOD_Y:
|
|
case IIO_MOD_Z:
|
|
/*
|
|
* Motion detection mode cannot run at the same time as
|
|
* acceleration data being read.
|
|
*/
|
|
if ((st->rx[0] & SCA3000_REG_MODE_MODE_MASK)
|
|
!= SCA3000_REG_MODE_MEAS_MODE_MOT_DET) {
|
|
ret = 0;
|
|
} else {
|
|
ret = sca3000_read_ctrl_reg(st,
|
|
SCA3000_REG_CTRL_SEL_MD_CTRL);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
/* only supporting logical or's for now */
|
|
ret = !!(ret & sca3000_addresses[chan->address][2]);
|
|
}
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sca3000_freefall_set_state(struct iio_dev *indio_dev, int state)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
/* read current value of mode register */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* if off and should be on */
|
|
if (state && !(st->rx[0] & SCA3000_REG_MODE_FREE_FALL_DETECT))
|
|
return sca3000_write_reg(st, SCA3000_REG_MODE_ADDR,
|
|
st->rx[0] | SCA3000_REG_MODE_FREE_FALL_DETECT);
|
|
/* if on and should be off */
|
|
else if (!state && (st->rx[0] & SCA3000_REG_MODE_FREE_FALL_DETECT))
|
|
return sca3000_write_reg(st, SCA3000_REG_MODE_ADDR,
|
|
st->rx[0] & ~SCA3000_REG_MODE_FREE_FALL_DETECT);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int sca3000_motion_detect_set_state(struct iio_dev *indio_dev, int axis,
|
|
int state)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret, ctrlval;
|
|
|
|
/*
|
|
* First read the motion detector config to find out if
|
|
* this axis is on
|
|
*/
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
|
|
if (ret < 0)
|
|
return ret;
|
|
ctrlval = ret;
|
|
/* if off and should be on */
|
|
if (state && !(ctrlval & sca3000_addresses[axis][2])) {
|
|
ret = sca3000_write_ctrl_reg(st,
|
|
SCA3000_REG_CTRL_SEL_MD_CTRL,
|
|
ctrlval |
|
|
sca3000_addresses[axis][2]);
|
|
if (ret)
|
|
return ret;
|
|
st->mo_det_use_count++;
|
|
} else if (!state && (ctrlval & sca3000_addresses[axis][2])) {
|
|
ret = sca3000_write_ctrl_reg(st,
|
|
SCA3000_REG_CTRL_SEL_MD_CTRL,
|
|
ctrlval &
|
|
~(sca3000_addresses[axis][2]));
|
|
if (ret)
|
|
return ret;
|
|
st->mo_det_use_count--;
|
|
}
|
|
|
|
/* read current value of mode register */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
return ret;
|
|
/* if off and should be on */
|
|
if ((st->mo_det_use_count) &&
|
|
((st->rx[0] & SCA3000_REG_MODE_MODE_MASK)
|
|
!= SCA3000_REG_MODE_MEAS_MODE_MOT_DET))
|
|
return sca3000_write_reg(st, SCA3000_REG_MODE_ADDR,
|
|
(st->rx[0] & ~SCA3000_REG_MODE_MODE_MASK)
|
|
| SCA3000_REG_MODE_MEAS_MODE_MOT_DET);
|
|
/* if on and should be off */
|
|
else if (!(st->mo_det_use_count) &&
|
|
((st->rx[0] & SCA3000_REG_MODE_MODE_MASK)
|
|
== SCA3000_REG_MODE_MEAS_MODE_MOT_DET))
|
|
return sca3000_write_reg(st, SCA3000_REG_MODE_ADDR,
|
|
st->rx[0] & SCA3000_REG_MODE_MODE_MASK);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sca3000_write_event_config() - simple on off control for motion detector
|
|
* @indio_dev: IIO device instance specific structure. Data specific to this
|
|
* particular driver may be accessed via iio_priv(indio_dev).
|
|
* @chan: Description of the channel whose event we are configuring.
|
|
* @type: The type of event.
|
|
* @dir: The direction of the event.
|
|
* @state: Desired state of event being configured.
|
|
*
|
|
* This is a per axis control, but enabling any will result in the
|
|
* motion detector unit being enabled.
|
|
* N.B. enabling motion detector stops normal data acquisition.
|
|
* There is a complexity in knowing which mode to return to when
|
|
* this mode is disabled. Currently normal mode is assumed.
|
|
**/
|
|
static int sca3000_write_event_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
int state)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
switch (chan->channel2) {
|
|
case IIO_MOD_X_AND_Y_AND_Z:
|
|
ret = sca3000_freefall_set_state(indio_dev, state);
|
|
break;
|
|
|
|
case IIO_MOD_X:
|
|
case IIO_MOD_Y:
|
|
case IIO_MOD_Z:
|
|
ret = sca3000_motion_detect_set_state(indio_dev,
|
|
chan->address,
|
|
state);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sca3000_configure_ring(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_buffer *buffer;
|
|
|
|
buffer = devm_iio_kfifo_allocate(&indio_dev->dev);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
iio_device_attach_buffer(indio_dev, buffer);
|
|
indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
int __sca3000_hw_ring_state_set(struct iio_dev *indio_dev, bool state)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
if (state) {
|
|
dev_info(&indio_dev->dev, "supposedly enabling ring buffer\n");
|
|
ret = sca3000_write_reg(st,
|
|
SCA3000_REG_MODE_ADDR,
|
|
(st->rx[0] | SCA3000_REG_MODE_RING_BUF_ENABLE));
|
|
} else
|
|
ret = sca3000_write_reg(st,
|
|
SCA3000_REG_MODE_ADDR,
|
|
(st->rx[0] & ~SCA3000_REG_MODE_RING_BUF_ENABLE));
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sca3000_hw_ring_preenable() - hw ring buffer preenable function
|
|
* @indio_dev: structure representing the IIO device. Device instance
|
|
* specific state can be accessed via iio_priv(indio_dev).
|
|
*
|
|
* Very simple enable function as the chip will allows normal reads
|
|
* during ring buffer operation so as long as it is indeed running
|
|
* before we notify the core, the precise ordering does not matter.
|
|
*/
|
|
static int sca3000_hw_ring_preenable(struct iio_dev *indio_dev)
|
|
{
|
|
int ret;
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
|
|
mutex_lock(&st->lock);
|
|
|
|
/* Enable the 50% full interrupt */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_INT_MASK_ADDR, 1);
|
|
if (ret)
|
|
goto error_unlock;
|
|
ret = sca3000_write_reg(st,
|
|
SCA3000_REG_INT_MASK_ADDR,
|
|
st->rx[0] | SCA3000_REG_INT_MASK_RING_HALF);
|
|
if (ret)
|
|
goto error_unlock;
|
|
|
|
mutex_unlock(&st->lock);
|
|
|
|
return __sca3000_hw_ring_state_set(indio_dev, 1);
|
|
|
|
error_unlock:
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sca3000_hw_ring_postdisable(struct iio_dev *indio_dev)
|
|
{
|
|
int ret;
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
|
|
ret = __sca3000_hw_ring_state_set(indio_dev, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Disable the 50% full interrupt */
|
|
mutex_lock(&st->lock);
|
|
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_INT_MASK_ADDR, 1);
|
|
if (ret)
|
|
goto unlock;
|
|
ret = sca3000_write_reg(st,
|
|
SCA3000_REG_INT_MASK_ADDR,
|
|
st->rx[0] & ~SCA3000_REG_INT_MASK_RING_HALF);
|
|
unlock:
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_buffer_setup_ops sca3000_ring_setup_ops = {
|
|
.preenable = &sca3000_hw_ring_preenable,
|
|
.postdisable = &sca3000_hw_ring_postdisable,
|
|
};
|
|
|
|
/**
|
|
* sca3000_clean_setup() - get the device into a predictable state
|
|
* @st: Device instance specific private data structure
|
|
*
|
|
* Devices use flash memory to store many of the register values
|
|
* and hence can come up in somewhat unpredictable states.
|
|
* Hence reset everything on driver load.
|
|
*/
|
|
static int sca3000_clean_setup(struct sca3000_state *st)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
/* Ensure all interrupts have been acknowledged */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_INT_STATUS_ADDR, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
/* Turn off all motion detection channels */
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL,
|
|
ret & SCA3000_MD_CTRL_PROT_MASK);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
/* Disable ring buffer */
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
|
|
(ret & SCA3000_REG_OUT_CTRL_PROT_MASK)
|
|
| SCA3000_REG_OUT_CTRL_BUF_X_EN
|
|
| SCA3000_REG_OUT_CTRL_BUF_Y_EN
|
|
| SCA3000_REG_OUT_CTRL_BUF_Z_EN
|
|
| SCA3000_REG_OUT_CTRL_BUF_DIV_4);
|
|
if (ret)
|
|
goto error_ret;
|
|
/* Enable interrupts, relevant to mode and set up as active low */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_INT_MASK_ADDR, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = sca3000_write_reg(st,
|
|
SCA3000_REG_INT_MASK_ADDR,
|
|
(ret & SCA3000_REG_INT_MASK_PROT_MASK)
|
|
| SCA3000_REG_INT_MASK_ACTIVE_LOW);
|
|
if (ret)
|
|
goto error_ret;
|
|
/*
|
|
* Select normal measurement mode, free fall off, ring off
|
|
* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5
|
|
* as that occurs in one of the example on the datasheet
|
|
*/
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = sca3000_write_reg(st, SCA3000_REG_MODE_ADDR,
|
|
(st->rx[0] & SCA3000_MODE_PROT_MASK));
|
|
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_info sca3000_info = {
|
|
.attrs = &sca3000_attribute_group,
|
|
.read_raw = &sca3000_read_raw,
|
|
.write_raw = &sca3000_write_raw,
|
|
.read_event_value = &sca3000_read_event_value,
|
|
.write_event_value = &sca3000_write_event_value,
|
|
.read_event_config = &sca3000_read_event_config,
|
|
.write_event_config = &sca3000_write_event_config,
|
|
};
|
|
|
|
static int sca3000_probe(struct spi_device *spi)
|
|
{
|
|
int ret;
|
|
struct sca3000_state *st;
|
|
struct iio_dev *indio_dev;
|
|
|
|
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
st = iio_priv(indio_dev);
|
|
spi_set_drvdata(spi, indio_dev);
|
|
st->us = spi;
|
|
mutex_init(&st->lock);
|
|
st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi)
|
|
->driver_data];
|
|
|
|
indio_dev->dev.parent = &spi->dev;
|
|
indio_dev->name = spi_get_device_id(spi)->name;
|
|
indio_dev->info = &sca3000_info;
|
|
if (st->info->temp_output) {
|
|
indio_dev->channels = sca3000_channels_with_temp;
|
|
indio_dev->num_channels =
|
|
ARRAY_SIZE(sca3000_channels_with_temp);
|
|
} else {
|
|
indio_dev->channels = sca3000_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(sca3000_channels);
|
|
}
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = sca3000_configure_ring(indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (spi->irq) {
|
|
ret = request_threaded_irq(spi->irq,
|
|
NULL,
|
|
&sca3000_event_handler,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
"sca3000",
|
|
indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
indio_dev->setup_ops = &sca3000_ring_setup_ops;
|
|
ret = sca3000_clean_setup(st);
|
|
if (ret)
|
|
goto error_free_irq;
|
|
|
|
ret = sca3000_print_rev(indio_dev);
|
|
if (ret)
|
|
goto error_free_irq;
|
|
|
|
return iio_device_register(indio_dev);
|
|
|
|
error_free_irq:
|
|
if (spi->irq)
|
|
free_irq(spi->irq, indio_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sca3000_stop_all_interrupts(struct sca3000_state *st)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_INT_MASK_ADDR, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = sca3000_write_reg(st, SCA3000_REG_INT_MASK_ADDR,
|
|
(st->rx[0] &
|
|
~(SCA3000_REG_INT_MASK_RING_THREE_QUARTER |
|
|
SCA3000_REG_INT_MASK_RING_HALF |
|
|
SCA3000_REG_INT_MASK_ALL_INTS)));
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int sca3000_remove(struct spi_device *spi)
|
|
{
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
/* Must ensure no interrupts can be generated after this! */
|
|
sca3000_stop_all_interrupts(st);
|
|
if (spi->irq)
|
|
free_irq(spi->irq, indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct spi_device_id sca3000_id[] = {
|
|
{"sca3000_d01", d01},
|
|
{"sca3000_e02", e02},
|
|
{"sca3000_e04", e04},
|
|
{"sca3000_e05", e05},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, sca3000_id);
|
|
|
|
static struct spi_driver sca3000_driver = {
|
|
.driver = {
|
|
.name = "sca3000",
|
|
},
|
|
.probe = sca3000_probe,
|
|
.remove = sca3000_remove,
|
|
.id_table = sca3000_id,
|
|
};
|
|
module_spi_driver(sca3000_driver);
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
|
|
MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver");
|
|
MODULE_LICENSE("GPL v2");
|