To compile this driver as a module, choose M here: the module will be
called mxc6255.
+config SCA3000
+ select IIO_BUFFER
+ select IIO_KFIFO_BUF
+ depends on SPI
+ tristate "VTI SCA3000 series accelerometers"
+ help
+ Say Y here to build support for the VTI SCA3000 series of SPI
+ accelerometers. These devices use a hardware ring buffer.
+
+ To compile this driver as a module, say M here: the module will be
+ called sca3000.
+
config STK8312
tristate "Sensortek STK8312 3-Axis Accelerometer Driver"
depends on I2C
obj-$(CONFIG_MXC4005) += mxc4005.o
obj-$(CONFIG_MXC6255) += mxc6255.o
+obj-$(CONFIG_SCA3000) += sca3000.o
+
obj-$(CONFIG_STK8312) += stk8312.o
obj-$(CONFIG_STK8BA50) += stk8ba50.o
--- /dev/null
+/*
+ * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * Copyright (c) 2009 Jonathan Cameron <jic23@kernel.org>
+ *
+ * See industrialio/accels/sca3000.h for comments.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/kfifo_buf.h>
+
+#define SCA3000_WRITE_REG(a) (((a) << 2) | 0x02)
+#define SCA3000_READ_REG(a) ((a) << 2)
+
+#define SCA3000_REG_REVID_ADDR 0x00
+#define SCA3000_REG_REVID_MAJOR_MASK GENMASK(8, 4)
+#define SCA3000_REG_REVID_MINOR_MASK GENMASK(3, 0)
+
+#define SCA3000_REG_STATUS_ADDR 0x02
+#define SCA3000_LOCKED BIT(5)
+#define SCA3000_EEPROM_CS_ERROR BIT(1)
+#define SCA3000_SPI_FRAME_ERROR BIT(0)
+
+/* All reads done using register decrement so no need to directly access LSBs */
+#define SCA3000_REG_X_MSB_ADDR 0x05
+#define SCA3000_REG_Y_MSB_ADDR 0x07
+#define SCA3000_REG_Z_MSB_ADDR 0x09
+
+#define SCA3000_REG_RING_OUT_ADDR 0x0f
+
+/* Temp read untested - the e05 doesn't have the sensor */
+#define SCA3000_REG_TEMP_MSB_ADDR 0x13
+
+#define SCA3000_REG_MODE_ADDR 0x14
+#define SCA3000_MODE_PROT_MASK 0x28
+#define SCA3000_REG_MODE_RING_BUF_ENABLE BIT(7)
+#define SCA3000_REG_MODE_RING_BUF_8BIT BIT(6)
+
+/*
+ * Free fall detection triggers an interrupt if the acceleration
+ * is below a threshold for equivalent of 25cm drop
+ */
+#define SCA3000_REG_MODE_FREE_FALL_DETECT BIT(4)
+#define SCA3000_REG_MODE_MEAS_MODE_NORMAL 0x00
+#define SCA3000_REG_MODE_MEAS_MODE_OP_1 0x01
+#define SCA3000_REG_MODE_MEAS_MODE_OP_2 0x02
+
+/*
+ * In motion detection mode the accelerations are band pass filtered
+ * (approx 1 - 25Hz) and then a programmable threshold used to trigger
+ * and interrupt.
+ */
+#define SCA3000_REG_MODE_MEAS_MODE_MOT_DET 0x03
+#define SCA3000_REG_MODE_MODE_MASK 0x03
+
+#define SCA3000_REG_BUF_COUNT_ADDR 0x15
+
+#define SCA3000_REG_INT_STATUS_ADDR 0x16
+#define SCA3000_REG_INT_STATUS_THREE_QUARTERS BIT(7)
+#define SCA3000_REG_INT_STATUS_HALF BIT(6)
+
+#define SCA3000_INT_STATUS_FREE_FALL BIT(3)
+#define SCA3000_INT_STATUS_Y_TRIGGER BIT(2)
+#define SCA3000_INT_STATUS_X_TRIGGER BIT(1)
+#define SCA3000_INT_STATUS_Z_TRIGGER BIT(0)
+
+/* Used to allow access to multiplexed registers */
+#define SCA3000_REG_CTRL_SEL_ADDR 0x18
+/* Only available for SCA3000-D03 and SCA3000-D01 */
+#define SCA3000_REG_CTRL_SEL_I2C_DISABLE 0x01
+#define SCA3000_REG_CTRL_SEL_MD_CTRL 0x02
+#define SCA3000_REG_CTRL_SEL_MD_Y_TH 0x03
+#define SCA3000_REG_CTRL_SEL_MD_X_TH 0x04
+#define SCA3000_REG_CTRL_SEL_MD_Z_TH 0x05
+/*
+ * BE VERY CAREFUL WITH THIS, IF 3 BITS ARE NOT SET the device
+ * will not function
+ */
+#define SCA3000_REG_CTRL_SEL_OUT_CTRL 0x0B
+
+#define SCA3000_REG_OUT_CTRL_PROT_MASK 0xE0
+#define SCA3000_REG_OUT_CTRL_BUF_X_EN 0x10
+#define SCA3000_REG_OUT_CTRL_BUF_Y_EN 0x08
+#define SCA3000_REG_OUT_CTRL_BUF_Z_EN 0x04
+#define SCA3000_REG_OUT_CTRL_BUF_DIV_MASK 0x03
+#define SCA3000_REG_OUT_CTRL_BUF_DIV_4 0x02
+#define SCA3000_REG_OUT_CTRL_BUF_DIV_2 0x01
+
+
+/*
+ * Control which motion detector interrupts are on.
+ * For now only OR combinations are supported.
+ */
+#define SCA3000_MD_CTRL_PROT_MASK 0xC0
+#define SCA3000_MD_CTRL_OR_Y BIT(0)
+#define SCA3000_MD_CTRL_OR_X BIT(1)
+#define SCA3000_MD_CTRL_OR_Z BIT(2)
+/* Currently unsupported */
+#define SCA3000_MD_CTRL_AND_Y BIT(3)
+#define SCA3000_MD_CTRL_AND_X BIT(4)
+#define SAC3000_MD_CTRL_AND_Z BIT(5)
+
+/*
+ * Some control registers of complex access methods requiring this register to
+ * be used to remove a lock.
+ */
+#define SCA3000_REG_UNLOCK_ADDR 0x1e
+
+#define SCA3000_REG_INT_MASK_ADDR 0x21
+#define SCA3000_REG_INT_MASK_PROT_MASK 0x1C
+
+#define SCA3000_REG_INT_MASK_RING_THREE_QUARTER BIT(7)
+#define SCA3000_REG_INT_MASK_RING_HALF BIT(6)
+
+#define SCA3000_REG_INT_MASK_ALL_INTS 0x02
+#define SCA3000_REG_INT_MASK_ACTIVE_HIGH 0x01
+#define SCA3000_REG_INT_MASK_ACTIVE_LOW 0x00
+/* Values of multiplexed registers (write to ctrl_data after select) */
+#define SCA3000_REG_CTRL_DATA_ADDR 0x22
+
+/*
+ * Measurement modes available on some sca3000 series chips. Code assumes others
+ * may become available in the future.
+ *
+ * Bypass - Bypass the low-pass filter in the signal channel so as to increase
+ * signal bandwidth.
+ *
+ * Narrow - Narrow low-pass filtering of the signal channel and half output
+ * data rate by decimation.
+ *
+ * Wide - Widen low-pass filtering of signal channel to increase bandwidth
+ */
+#define SCA3000_OP_MODE_BYPASS 0x01
+#define SCA3000_OP_MODE_NARROW 0x02
+#define SCA3000_OP_MODE_WIDE 0x04
+#define SCA3000_MAX_TX 6
+#define SCA3000_MAX_RX 2
+
+/**
+ * struct sca3000_state - device instance state information
+ * @us: the associated spi device
+ * @info: chip variant information
+ * @last_timestamp: the timestamp of the last event
+ * @mo_det_use_count: reference counter for the motion detection unit
+ * @lock: lock used to protect elements of sca3000_state
+ * and the underlying device state.
+ * @tx: dma-able transmit buffer
+ * @rx: dma-able receive buffer
+ **/
+struct sca3000_state {
+ struct spi_device *us;
+ const struct sca3000_chip_info *info;
+ s64 last_timestamp;
+ int mo_det_use_count;
+ struct mutex lock;
+ /* Can these share a cacheline ? */
+ u8 rx[384] ____cacheline_aligned;
+ u8 tx[6] ____cacheline_aligned;
+};
+
+/**
+ * struct sca3000_chip_info - model dependent parameters
+ * @scale: scale * 10^-6
+ * @temp_output: some devices have temperature sensors.
+ * @measurement_mode_freq: normal mode sampling frequency
+ * @measurement_mode_3db_freq: 3db cutoff frequency of the low pass filter for
+ * the normal measurement mode.
+ * @option_mode_1: first optional mode. Not all models have one
+ * @option_mode_1_freq: option mode 1 sampling frequency
+ * @option_mode_1_3db_freq: 3db cutoff frequency of the low pass filter for
+ * the first option mode.
+ * @option_mode_2: second optional mode. Not all chips have one
+ * @option_mode_2_freq: option mode 2 sampling frequency
+ * @option_mode_2_3db_freq: 3db cutoff frequency of the low pass filter for
+ * the second option mode.
+ * @mod_det_mult_xz: Bit wise multipliers to calculate the threshold
+ * for motion detection in the x and z axis.
+ * @mod_det_mult_y: Bit wise multipliers to calculate the threshold
+ * for motion detection in the y axis.
+ *
+ * This structure is used to hold information about the functionality of a given
+ * sca3000 variant.
+ **/
+struct sca3000_chip_info {
+ unsigned int scale;
+ bool temp_output;
+ int measurement_mode_freq;
+ int measurement_mode_3db_freq;
+ int option_mode_1;
+ int option_mode_1_freq;
+ int option_mode_1_3db_freq;
+ int option_mode_2;
+ int option_mode_2_freq;
+ int option_mode_2_3db_freq;
+ int mot_det_mult_xz[6];
+ int mot_det_mult_y[7];
+};
+
+enum sca3000_variant {
+ d01,
+ e02,
+ e04,
+ e05,
+};
+
+/*
+ * Note where option modes are not defined, the chip simply does not
+ * support any.
+ * Other chips in the sca3000 series use i2c and are not included here.
+ *
+ * Some of these devices are only listed in the family data sheet and
+ * do not actually appear to be available.
+ */
+static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = {
+ [d01] = {
+ .scale = 7357,
+ .temp_output = true,
+ .measurement_mode_freq = 250,
+ .measurement_mode_3db_freq = 45,
+ .option_mode_1 = SCA3000_OP_MODE_BYPASS,
+ .option_mode_1_freq = 250,
+ .option_mode_1_3db_freq = 70,
+ .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300},
+ .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750},
+ },
+ [e02] = {
+ .scale = 9810,
+ .measurement_mode_freq = 125,
+ .measurement_mode_3db_freq = 40,
+ .option_mode_1 = SCA3000_OP_MODE_NARROW,
+ .option_mode_1_freq = 63,
+ .option_mode_1_3db_freq = 11,
+ .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050},
+ .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700},
+ },
+ [e04] = {
+ .scale = 19620,
+ .measurement_mode_freq = 100,
+ .measurement_mode_3db_freq = 38,
+ .option_mode_1 = SCA3000_OP_MODE_NARROW,
+ .option_mode_1_freq = 50,
+ .option_mode_1_3db_freq = 9,
+ .option_mode_2 = SCA3000_OP_MODE_WIDE,
+ .option_mode_2_freq = 400,
+ .option_mode_2_3db_freq = 70,
+ .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100},
+ .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000},
+ },
+ [e05] = {
+ .scale = 61313,
+ .measurement_mode_freq = 200,
+ .measurement_mode_3db_freq = 60,
+ .option_mode_1 = SCA3000_OP_MODE_NARROW,
+ .option_mode_1_freq = 50,
+ .option_mode_1_3db_freq = 9,
+ .option_mode_2 = SCA3000_OP_MODE_WIDE,
+ .option_mode_2_freq = 400,
+ .option_mode_2_3db_freq = 75,
+ .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900},
+ .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600},
+ },
+};
+
+static int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val)
+{
+ st->tx[0] = SCA3000_WRITE_REG(address);
+ st->tx[1] = val;
+ return spi_write(st->us, st->tx, 2);
+}
+
+static int sca3000_read_data_short(struct sca3000_state *st,
+ u8 reg_address_high,
+ int len)
+{
+ struct spi_transfer xfer[2] = {
+ {
+ .len = 1,
+ .tx_buf = st->tx,
+ }, {
+ .len = len,
+ .rx_buf = st->rx,
+ }
+ };
+ st->tx[0] = SCA3000_READ_REG(reg_address_high);
+
+ return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
+}
+
+/**
+ * sca3000_reg_lock_on() - test if the ctrl register lock is on
+ * @st: Driver specific device instance data.
+ *
+ * Lock must be held.
+ **/
+static int sca3000_reg_lock_on(struct sca3000_state *st)
+{
+ int ret;
+
+ ret = sca3000_read_data_short(st, SCA3000_REG_STATUS_ADDR, 1);
+ if (ret < 0)
+ return ret;
+
+ return !(st->rx[0] & SCA3000_LOCKED);
+}
+
+/**
+ * __sca3000_unlock_reg_lock() - unlock the control registers
+ * @st: Driver specific device instance data.
+ *
+ * Note the device does not appear to support doing this in a single transfer.
+ * This should only ever be used as part of ctrl reg read.
+ * Lock must be held before calling this
+ */
+static int __sca3000_unlock_reg_lock(struct sca3000_state *st)
+{
+ struct spi_transfer xfer[3] = {
+ {
+ .len = 2,
+ .cs_change = 1,
+ .tx_buf = st->tx,
+ }, {
+ .len = 2,
+ .cs_change = 1,
+ .tx_buf = st->tx + 2,
+ }, {
+ .len = 2,
+ .tx_buf = st->tx + 4,
+ },
+ };
+ st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
+ st->tx[1] = 0x00;
+ st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
+ st->tx[3] = 0x50;
+ st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
+ st->tx[5] = 0xA0;
+
+ return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
+}
+
+/**
+ * sca3000_write_ctrl_reg() write to a lock protect ctrl register
+ * @st: Driver specific device instance data.
+ * @sel: selects which registers we wish to write to
+ * @val: the value to be written
+ *
+ * Certain control registers are protected against overwriting by the lock
+ * register and use a shared write address. This function allows writing of
+ * these registers.
+ * Lock must be held.
+ */
+static int sca3000_write_ctrl_reg(struct sca3000_state *st,
+ u8 sel,
+ uint8_t val)
+{
+ int ret;
+
+ ret = sca3000_reg_lock_on(st);
+ if (ret < 0)
+ goto error_ret;
+ if (ret) {
+ ret = __sca3000_unlock_reg_lock(st);
+ if (ret)
+ goto error_ret;
+ }
+
+ /* Set the control select register */
+ ret = sca3000_write_reg(st, SCA3000_REG_CTRL_SEL_ADDR, sel);
+ if (ret)
+ goto error_ret;
+
+ /* Write the actual value into the register */
+ ret = sca3000_write_reg(st, SCA3000_REG_CTRL_DATA_ADDR, val);
+
+error_ret:
+ return ret;
+}
+
+/**
+ * sca3000_read_ctrl_reg() read from lock protected control register.
+ * @st: Driver specific device instance data.
+ * @ctrl_reg: Which ctrl register do we want to read.
+ *
+ * Lock must be held.
+ */
+static int sca3000_read_ctrl_reg(struct sca3000_state *st,
+ u8 ctrl_reg)
+{
+ int ret;
+
+ ret = sca3000_reg_lock_on(st);
+ if (ret < 0)
+ goto error_ret;
+ if (ret) {
+ ret = __sca3000_unlock_reg_lock(st);
+ if (ret)
+ goto error_ret;
+ }
+ /* Set the control select register */
+ ret = sca3000_write_reg(st, SCA3000_REG_CTRL_SEL_ADDR, ctrl_reg);
+ if (ret)
+ goto error_ret;
+ ret = sca3000_read_data_short(st, SCA3000_REG_CTRL_DATA_ADDR, 1);
+ if (ret)
+ goto error_ret;
+ return st->rx[0];
+error_ret:
+ return ret;
+}
+
+/**
+ * sca3000_show_rev() - sysfs interface to read the chip revision number
+ * @indio_dev: Device instance specific generic IIO data.
+ * Driver specific device instance data can be obtained via
+ * via iio_priv(indio_dev)
+ */
+static int sca3000_print_rev(struct iio_dev *indio_dev)
+{
+ int ret;
+ struct sca3000_state *st = iio_priv(indio_dev);
+
+ mutex_lock(&st->lock);
+ ret = sca3000_read_data_short(st, SCA3000_REG_REVID_ADDR, 1);
+ if (ret < 0)
+ goto error_ret;
+ dev_info(&indio_dev->dev,
+ "sca3000 revision major=%lu, minor=%lu\n",
+ st->rx[0] & SCA3000_REG_REVID_MAJOR_MASK,
+ st->rx[0] & SCA3000_REG_REVID_MINOR_MASK);
+error_ret:
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static ssize_t
+sca3000_show_available_3db_freqs(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;
+
+ len = sprintf(buf, "%d", st->info->measurement_mode_3db_freq);
+ if (st->info->option_mode_1)
+ len += sprintf(buf + len, " %d",
+ 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);
+ 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 = iio_kfifo_allocate();
+ if (!buffer)
+ return -ENOMEM;
+
+ iio_device_attach_buffer(indio_dev, buffer);
+ indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
+
+ return 0;
+}
+
+static void sca3000_unconfigure_ring(struct iio_dev *indio_dev)
+{
+ iio_kfifo_free(indio_dev->buffer);
+}
+
+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,
+ .driver_module = THIS_MODULE,
+};
+
+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;
+
+ sca3000_configure_ring(indio_dev);
+
+ 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);
+
+ sca3000_unconfigure_ring(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");
To compile this driver as a module, say M here: the module will be
called adis16240.
-config SCA3000
- select IIO_BUFFER
- select IIO_KFIFO_BUF
- depends on SPI
- tristate "VTI SCA3000 series accelerometers"
- help
- Say Y here to build support for the VTI SCA3000 series of SPI
- accelerometers. These devices use a hardware ring buffer.
-
- To compile this driver as a module, say M here: the module will be
- called sca3000.
endmenu
adis16240-y := adis16240_core.o
obj-$(CONFIG_ADIS16240) += adis16240.o
-
-obj-$(CONFIG_SCA3000) += sca3000.o
+++ /dev/null
-/*
- * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * Copyright (c) 2009 Jonathan Cameron <jic23@kernel.org>
- *
- * See industrialio/accels/sca3000.h for comments.
- */
-
-#include <linux/interrupt.h>
-#include <linux/fs.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/spi/spi.h>
-#include <linux/sysfs.h>
-#include <linux/module.h>
-#include <linux/uaccess.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include <linux/iio/events.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/kfifo_buf.h>
-
-#define SCA3000_WRITE_REG(a) (((a) << 2) | 0x02)
-#define SCA3000_READ_REG(a) ((a) << 2)
-
-#define SCA3000_REG_REVID_ADDR 0x00
-#define SCA3000_REG_REVID_MAJOR_MASK GENMASK(8, 4)
-#define SCA3000_REG_REVID_MINOR_MASK GENMASK(3, 0)
-
-#define SCA3000_REG_STATUS_ADDR 0x02
-#define SCA3000_LOCKED BIT(5)
-#define SCA3000_EEPROM_CS_ERROR BIT(1)
-#define SCA3000_SPI_FRAME_ERROR BIT(0)
-
-/* All reads done using register decrement so no need to directly access LSBs */
-#define SCA3000_REG_X_MSB_ADDR 0x05
-#define SCA3000_REG_Y_MSB_ADDR 0x07
-#define SCA3000_REG_Z_MSB_ADDR 0x09
-
-#define SCA3000_REG_RING_OUT_ADDR 0x0f
-
-/* Temp read untested - the e05 doesn't have the sensor */
-#define SCA3000_REG_TEMP_MSB_ADDR 0x13
-
-#define SCA3000_REG_MODE_ADDR 0x14
-#define SCA3000_MODE_PROT_MASK 0x28
-#define SCA3000_REG_MODE_RING_BUF_ENABLE BIT(7)
-#define SCA3000_REG_MODE_RING_BUF_8BIT BIT(6)
-
-/*
- * Free fall detection triggers an interrupt if the acceleration
- * is below a threshold for equivalent of 25cm drop
- */
-#define SCA3000_REG_MODE_FREE_FALL_DETECT BIT(4)
-#define SCA3000_REG_MODE_MEAS_MODE_NORMAL 0x00
-#define SCA3000_REG_MODE_MEAS_MODE_OP_1 0x01
-#define SCA3000_REG_MODE_MEAS_MODE_OP_2 0x02
-
-/*
- * In motion detection mode the accelerations are band pass filtered
- * (approx 1 - 25Hz) and then a programmable threshold used to trigger
- * and interrupt.
- */
-#define SCA3000_REG_MODE_MEAS_MODE_MOT_DET 0x03
-#define SCA3000_REG_MODE_MODE_MASK 0x03
-
-#define SCA3000_REG_BUF_COUNT_ADDR 0x15
-
-#define SCA3000_REG_INT_STATUS_ADDR 0x16
-#define SCA3000_REG_INT_STATUS_THREE_QUARTERS BIT(7)
-#define SCA3000_REG_INT_STATUS_HALF BIT(6)
-
-#define SCA3000_INT_STATUS_FREE_FALL BIT(3)
-#define SCA3000_INT_STATUS_Y_TRIGGER BIT(2)
-#define SCA3000_INT_STATUS_X_TRIGGER BIT(1)
-#define SCA3000_INT_STATUS_Z_TRIGGER BIT(0)
-
-/* Used to allow access to multiplexed registers */
-#define SCA3000_REG_CTRL_SEL_ADDR 0x18
-/* Only available for SCA3000-D03 and SCA3000-D01 */
-#define SCA3000_REG_CTRL_SEL_I2C_DISABLE 0x01
-#define SCA3000_REG_CTRL_SEL_MD_CTRL 0x02
-#define SCA3000_REG_CTRL_SEL_MD_Y_TH 0x03
-#define SCA3000_REG_CTRL_SEL_MD_X_TH 0x04
-#define SCA3000_REG_CTRL_SEL_MD_Z_TH 0x05
-/*
- * BE VERY CAREFUL WITH THIS, IF 3 BITS ARE NOT SET the device
- * will not function
- */
-#define SCA3000_REG_CTRL_SEL_OUT_CTRL 0x0B
-
-#define SCA3000_REG_OUT_CTRL_PROT_MASK 0xE0
-#define SCA3000_REG_OUT_CTRL_BUF_X_EN 0x10
-#define SCA3000_REG_OUT_CTRL_BUF_Y_EN 0x08
-#define SCA3000_REG_OUT_CTRL_BUF_Z_EN 0x04
-#define SCA3000_REG_OUT_CTRL_BUF_DIV_MASK 0x03
-#define SCA3000_REG_OUT_CTRL_BUF_DIV_4 0x02
-#define SCA3000_REG_OUT_CTRL_BUF_DIV_2 0x01
-
-
-/*
- * Control which motion detector interrupts are on.
- * For now only OR combinations are supported.
- */
-#define SCA3000_MD_CTRL_PROT_MASK 0xC0
-#define SCA3000_MD_CTRL_OR_Y BIT(0)
-#define SCA3000_MD_CTRL_OR_X BIT(1)
-#define SCA3000_MD_CTRL_OR_Z BIT(2)
-/* Currently unsupported */
-#define SCA3000_MD_CTRL_AND_Y BIT(3)
-#define SCA3000_MD_CTRL_AND_X BIT(4)
-#define SAC3000_MD_CTRL_AND_Z BIT(5)
-
-/*
- * Some control registers of complex access methods requiring this register to
- * be used to remove a lock.
- */
-#define SCA3000_REG_UNLOCK_ADDR 0x1e
-
-#define SCA3000_REG_INT_MASK_ADDR 0x21
-#define SCA3000_REG_INT_MASK_PROT_MASK 0x1C
-
-#define SCA3000_REG_INT_MASK_RING_THREE_QUARTER BIT(7)
-#define SCA3000_REG_INT_MASK_RING_HALF BIT(6)
-
-#define SCA3000_REG_INT_MASK_ALL_INTS 0x02
-#define SCA3000_REG_INT_MASK_ACTIVE_HIGH 0x01
-#define SCA3000_REG_INT_MASK_ACTIVE_LOW 0x00
-/* Values of multiplexed registers (write to ctrl_data after select) */
-#define SCA3000_REG_CTRL_DATA_ADDR 0x22
-
-/*
- * Measurement modes available on some sca3000 series chips. Code assumes others
- * may become available in the future.
- *
- * Bypass - Bypass the low-pass filter in the signal channel so as to increase
- * signal bandwidth.
- *
- * Narrow - Narrow low-pass filtering of the signal channel and half output
- * data rate by decimation.
- *
- * Wide - Widen low-pass filtering of signal channel to increase bandwidth
- */
-#define SCA3000_OP_MODE_BYPASS 0x01
-#define SCA3000_OP_MODE_NARROW 0x02
-#define SCA3000_OP_MODE_WIDE 0x04
-#define SCA3000_MAX_TX 6
-#define SCA3000_MAX_RX 2
-
-/**
- * struct sca3000_state - device instance state information
- * @us: the associated spi device
- * @info: chip variant information
- * @last_timestamp: the timestamp of the last event
- * @mo_det_use_count: reference counter for the motion detection unit
- * @lock: lock used to protect elements of sca3000_state
- * and the underlying device state.
- * @tx: dma-able transmit buffer
- * @rx: dma-able receive buffer
- **/
-struct sca3000_state {
- struct spi_device *us;
- const struct sca3000_chip_info *info;
- s64 last_timestamp;
- int mo_det_use_count;
- struct mutex lock;
- /* Can these share a cacheline ? */
- u8 rx[384] ____cacheline_aligned;
- u8 tx[6] ____cacheline_aligned;
-};
-
-/**
- * struct sca3000_chip_info - model dependent parameters
- * @scale: scale * 10^-6
- * @temp_output: some devices have temperature sensors.
- * @measurement_mode_freq: normal mode sampling frequency
- * @measurement_mode_3db_freq: 3db cutoff frequency of the low pass filter for
- * the normal measurement mode.
- * @option_mode_1: first optional mode. Not all models have one
- * @option_mode_1_freq: option mode 1 sampling frequency
- * @option_mode_1_3db_freq: 3db cutoff frequency of the low pass filter for
- * the first option mode.
- * @option_mode_2: second optional mode. Not all chips have one
- * @option_mode_2_freq: option mode 2 sampling frequency
- * @option_mode_2_3db_freq: 3db cutoff frequency of the low pass filter for
- * the second option mode.
- * @mod_det_mult_xz: Bit wise multipliers to calculate the threshold
- * for motion detection in the x and z axis.
- * @mod_det_mult_y: Bit wise multipliers to calculate the threshold
- * for motion detection in the y axis.
- *
- * This structure is used to hold information about the functionality of a given
- * sca3000 variant.
- **/
-struct sca3000_chip_info {
- unsigned int scale;
- bool temp_output;
- int measurement_mode_freq;
- int measurement_mode_3db_freq;
- int option_mode_1;
- int option_mode_1_freq;
- int option_mode_1_3db_freq;
- int option_mode_2;
- int option_mode_2_freq;
- int option_mode_2_3db_freq;
- int mot_det_mult_xz[6];
- int mot_det_mult_y[7];
-};
-
-enum sca3000_variant {
- d01,
- e02,
- e04,
- e05,
-};
-
-/*
- * Note where option modes are not defined, the chip simply does not
- * support any.
- * Other chips in the sca3000 series use i2c and are not included here.
- *
- * Some of these devices are only listed in the family data sheet and
- * do not actually appear to be available.
- */
-static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = {
- [d01] = {
- .scale = 7357,
- .temp_output = true,
- .measurement_mode_freq = 250,
- .measurement_mode_3db_freq = 45,
- .option_mode_1 = SCA3000_OP_MODE_BYPASS,
- .option_mode_1_freq = 250,
- .option_mode_1_3db_freq = 70,
- .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300},
- .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750},
- },
- [e02] = {
- .scale = 9810,
- .measurement_mode_freq = 125,
- .measurement_mode_3db_freq = 40,
- .option_mode_1 = SCA3000_OP_MODE_NARROW,
- .option_mode_1_freq = 63,
- .option_mode_1_3db_freq = 11,
- .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050},
- .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700},
- },
- [e04] = {
- .scale = 19620,
- .measurement_mode_freq = 100,
- .measurement_mode_3db_freq = 38,
- .option_mode_1 = SCA3000_OP_MODE_NARROW,
- .option_mode_1_freq = 50,
- .option_mode_1_3db_freq = 9,
- .option_mode_2 = SCA3000_OP_MODE_WIDE,
- .option_mode_2_freq = 400,
- .option_mode_2_3db_freq = 70,
- .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100},
- .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000},
- },
- [e05] = {
- .scale = 61313,
- .measurement_mode_freq = 200,
- .measurement_mode_3db_freq = 60,
- .option_mode_1 = SCA3000_OP_MODE_NARROW,
- .option_mode_1_freq = 50,
- .option_mode_1_3db_freq = 9,
- .option_mode_2 = SCA3000_OP_MODE_WIDE,
- .option_mode_2_freq = 400,
- .option_mode_2_3db_freq = 75,
- .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900},
- .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600},
- },
-};
-
-static int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val)
-{
- st->tx[0] = SCA3000_WRITE_REG(address);
- st->tx[1] = val;
- return spi_write(st->us, st->tx, 2);
-}
-
-static int sca3000_read_data_short(struct sca3000_state *st,
- u8 reg_address_high,
- int len)
-{
- struct spi_transfer xfer[2] = {
- {
- .len = 1,
- .tx_buf = st->tx,
- }, {
- .len = len,
- .rx_buf = st->rx,
- }
- };
- st->tx[0] = SCA3000_READ_REG(reg_address_high);
-
- return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
-}
-
-/**
- * sca3000_reg_lock_on() - test if the ctrl register lock is on
- * @st: Driver specific device instance data.
- *
- * Lock must be held.
- **/
-static int sca3000_reg_lock_on(struct sca3000_state *st)
-{
- int ret;
-
- ret = sca3000_read_data_short(st, SCA3000_REG_STATUS_ADDR, 1);
- if (ret < 0)
- return ret;
-
- return !(st->rx[0] & SCA3000_LOCKED);
-}
-
-/**
- * __sca3000_unlock_reg_lock() - unlock the control registers
- * @st: Driver specific device instance data.
- *
- * Note the device does not appear to support doing this in a single transfer.
- * This should only ever be used as part of ctrl reg read.
- * Lock must be held before calling this
- */
-static int __sca3000_unlock_reg_lock(struct sca3000_state *st)
-{
- struct spi_transfer xfer[3] = {
- {
- .len = 2,
- .cs_change = 1,
- .tx_buf = st->tx,
- }, {
- .len = 2,
- .cs_change = 1,
- .tx_buf = st->tx + 2,
- }, {
- .len = 2,
- .tx_buf = st->tx + 4,
- },
- };
- st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
- st->tx[1] = 0x00;
- st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
- st->tx[3] = 0x50;
- st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_UNLOCK_ADDR);
- st->tx[5] = 0xA0;
-
- return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
-}
-
-/**
- * sca3000_write_ctrl_reg() write to a lock protect ctrl register
- * @st: Driver specific device instance data.
- * @sel: selects which registers we wish to write to
- * @val: the value to be written
- *
- * Certain control registers are protected against overwriting by the lock
- * register and use a shared write address. This function allows writing of
- * these registers.
- * Lock must be held.
- */
-static int sca3000_write_ctrl_reg(struct sca3000_state *st,
- u8 sel,
- uint8_t val)
-{
- int ret;
-
- ret = sca3000_reg_lock_on(st);
- if (ret < 0)
- goto error_ret;
- if (ret) {
- ret = __sca3000_unlock_reg_lock(st);
- if (ret)
- goto error_ret;
- }
-
- /* Set the control select register */
- ret = sca3000_write_reg(st, SCA3000_REG_CTRL_SEL_ADDR, sel);
- if (ret)
- goto error_ret;
-
- /* Write the actual value into the register */
- ret = sca3000_write_reg(st, SCA3000_REG_CTRL_DATA_ADDR, val);
-
-error_ret:
- return ret;
-}
-
-/**
- * sca3000_read_ctrl_reg() read from lock protected control register.
- * @st: Driver specific device instance data.
- * @ctrl_reg: Which ctrl register do we want to read.
- *
- * Lock must be held.
- */
-static int sca3000_read_ctrl_reg(struct sca3000_state *st,
- u8 ctrl_reg)
-{
- int ret;
-
- ret = sca3000_reg_lock_on(st);
- if (ret < 0)
- goto error_ret;
- if (ret) {
- ret = __sca3000_unlock_reg_lock(st);
- if (ret)
- goto error_ret;
- }
- /* Set the control select register */
- ret = sca3000_write_reg(st, SCA3000_REG_CTRL_SEL_ADDR, ctrl_reg);
- if (ret)
- goto error_ret;
- ret = sca3000_read_data_short(st, SCA3000_REG_CTRL_DATA_ADDR, 1);
- if (ret)
- goto error_ret;
- return st->rx[0];
-error_ret:
- return ret;
-}
-
-/**
- * sca3000_show_rev() - sysfs interface to read the chip revision number
- * @indio_dev: Device instance specific generic IIO data.
- * Driver specific device instance data can be obtained via
- * via iio_priv(indio_dev)
- */
-static int sca3000_print_rev(struct iio_dev *indio_dev)
-{
- int ret;
- struct sca3000_state *st = iio_priv(indio_dev);
-
- mutex_lock(&st->lock);
- ret = sca3000_read_data_short(st, SCA3000_REG_REVID_ADDR, 1);
- if (ret < 0)
- goto error_ret;
- dev_info(&indio_dev->dev,
- "sca3000 revision major=%lu, minor=%lu\n",
- st->rx[0] & SCA3000_REG_REVID_MAJOR_MASK,
- st->rx[0] & SCA3000_REG_REVID_MINOR_MASK);
-error_ret:
- mutex_unlock(&st->lock);
-
- return ret;
-}
-
-static ssize_t
-sca3000_show_available_3db_freqs(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;
-
- len = sprintf(buf, "%d", st->info->measurement_mode_3db_freq);
- if (st->info->option_mode_1)
- len += sprintf(buf + len, " %d",
- 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);
- 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 = iio_kfifo_allocate();
- if (!buffer)
- return -ENOMEM;
-
- iio_device_attach_buffer(indio_dev, buffer);
- indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
-
- return 0;
-}
-
-static void sca3000_unconfigure_ring(struct iio_dev *indio_dev)
-{
- iio_kfifo_free(indio_dev->buffer);
-}
-
-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,
- .driver_module = THIS_MODULE,
-};
-
-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;
-
- sca3000_configure_ring(indio_dev);
-
- 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);
-
- sca3000_unconfigure_ring(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");
projects / mirror_ubuntu-jammy-kernel.git / commitdiff