Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
new file mode 100644
index 0000000..67b8817
--- /dev/null
+++ b/drivers/iio/accel/adxl372.c
@@ -0,0 +1,992 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ADXL372 3-Axis Digital Accelerometer core driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ */
+
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/events.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#include "adxl372.h"
+
+/* ADXL372 registers definition */
+#define ADXL372_DEVID 0x00
+#define ADXL372_DEVID_MST 0x01
+#define ADXL372_PARTID 0x02
+#define ADXL372_STATUS_1 0x04
+#define ADXL372_STATUS_2 0x05
+#define ADXL372_FIFO_ENTRIES_2 0x06
+#define ADXL372_FIFO_ENTRIES_1 0x07
+#define ADXL372_X_DATA_H 0x08
+#define ADXL372_X_DATA_L 0x09
+#define ADXL372_Y_DATA_H 0x0A
+#define ADXL372_Y_DATA_L 0x0B
+#define ADXL372_Z_DATA_H 0x0C
+#define ADXL372_Z_DATA_L 0x0D
+#define ADXL372_X_MAXPEAK_H 0x15
+#define ADXL372_X_MAXPEAK_L 0x16
+#define ADXL372_Y_MAXPEAK_H 0x17
+#define ADXL372_Y_MAXPEAK_L 0x18
+#define ADXL372_Z_MAXPEAK_H 0x19
+#define ADXL372_Z_MAXPEAK_L 0x1A
+#define ADXL372_OFFSET_X 0x20
+#define ADXL372_OFFSET_Y 0x21
+#define ADXL372_OFFSET_Z 0x22
+#define ADXL372_X_THRESH_ACT_H 0x23
+#define ADXL372_X_THRESH_ACT_L 0x24
+#define ADXL372_Y_THRESH_ACT_H 0x25
+#define ADXL372_Y_THRESH_ACT_L 0x26
+#define ADXL372_Z_THRESH_ACT_H 0x27
+#define ADXL372_Z_THRESH_ACT_L 0x28
+#define ADXL372_TIME_ACT 0x29
+#define ADXL372_X_THRESH_INACT_H 0x2A
+#define ADXL372_X_THRESH_INACT_L 0x2B
+#define ADXL372_Y_THRESH_INACT_H 0x2C
+#define ADXL372_Y_THRESH_INACT_L 0x2D
+#define ADXL372_Z_THRESH_INACT_H 0x2E
+#define ADXL372_Z_THRESH_INACT_L 0x2F
+#define ADXL372_TIME_INACT_H 0x30
+#define ADXL372_TIME_INACT_L 0x31
+#define ADXL372_X_THRESH_ACT2_H 0x32
+#define ADXL372_X_THRESH_ACT2_L 0x33
+#define ADXL372_Y_THRESH_ACT2_H 0x34
+#define ADXL372_Y_THRESH_ACT2_L 0x35
+#define ADXL372_Z_THRESH_ACT2_H 0x36
+#define ADXL372_Z_THRESH_ACT2_L 0x37
+#define ADXL372_HPF 0x38
+#define ADXL372_FIFO_SAMPLES 0x39
+#define ADXL372_FIFO_CTL 0x3A
+#define ADXL372_INT1_MAP 0x3B
+#define ADXL372_INT2_MAP 0x3C
+#define ADXL372_TIMING 0x3D
+#define ADXL372_MEASURE 0x3E
+#define ADXL372_POWER_CTL 0x3F
+#define ADXL372_SELF_TEST 0x40
+#define ADXL372_RESET 0x41
+#define ADXL372_FIFO_DATA 0x42
+
+#define ADXL372_DEVID_VAL 0xAD
+#define ADXL372_PARTID_VAL 0xFA
+#define ADXL372_RESET_CODE 0x52
+
+/* ADXL372_POWER_CTL */
+#define ADXL372_POWER_CTL_MODE_MSK GENMASK_ULL(1, 0)
+#define ADXL372_POWER_CTL_MODE(x) (((x) & 0x3) << 0)
+
+/* ADXL372_MEASURE */
+#define ADXL372_MEASURE_LINKLOOP_MSK GENMASK_ULL(5, 4)
+#define ADXL372_MEASURE_LINKLOOP_MODE(x) (((x) & 0x3) << 4)
+#define ADXL372_MEASURE_BANDWIDTH_MSK GENMASK_ULL(2, 0)
+#define ADXL372_MEASURE_BANDWIDTH_MODE(x) (((x) & 0x7) << 0)
+
+/* ADXL372_TIMING */
+#define ADXL372_TIMING_ODR_MSK GENMASK_ULL(7, 5)
+#define ADXL372_TIMING_ODR_MODE(x) (((x) & 0x7) << 5)
+
+/* ADXL372_FIFO_CTL */
+#define ADXL372_FIFO_CTL_FORMAT_MSK GENMASK(5, 3)
+#define ADXL372_FIFO_CTL_FORMAT_MODE(x) (((x) & 0x7) << 3)
+#define ADXL372_FIFO_CTL_MODE_MSK GENMASK(2, 1)
+#define ADXL372_FIFO_CTL_MODE_MODE(x) (((x) & 0x3) << 1)
+#define ADXL372_FIFO_CTL_SAMPLES_MSK BIT(1)
+#define ADXL372_FIFO_CTL_SAMPLES_MODE(x) (((x) > 0xFF) ? 1 : 0)
+
+/* ADXL372_STATUS_1 */
+#define ADXL372_STATUS_1_DATA_RDY(x) (((x) >> 0) & 0x1)
+#define ADXL372_STATUS_1_FIFO_RDY(x) (((x) >> 1) & 0x1)
+#define ADXL372_STATUS_1_FIFO_FULL(x) (((x) >> 2) & 0x1)
+#define ADXL372_STATUS_1_FIFO_OVR(x) (((x) >> 3) & 0x1)
+#define ADXL372_STATUS_1_USR_NVM_BUSY(x) (((x) >> 5) & 0x1)
+#define ADXL372_STATUS_1_AWAKE(x) (((x) >> 6) & 0x1)
+#define ADXL372_STATUS_1_ERR_USR_REGS(x) (((x) >> 7) & 0x1)
+
+/* ADXL372_INT1_MAP */
+#define ADXL372_INT1_MAP_DATA_RDY_MSK BIT(0)
+#define ADXL372_INT1_MAP_DATA_RDY_MODE(x) (((x) & 0x1) << 0)
+#define ADXL372_INT1_MAP_FIFO_RDY_MSK BIT(1)
+#define ADXL372_INT1_MAP_FIFO_RDY_MODE(x) (((x) & 0x1) << 1)
+#define ADXL372_INT1_MAP_FIFO_FULL_MSK BIT(2)
+#define ADXL372_INT1_MAP_FIFO_FULL_MODE(x) (((x) & 0x1) << 2)
+#define ADXL372_INT1_MAP_FIFO_OVR_MSK BIT(3)
+#define ADXL372_INT1_MAP_FIFO_OVR_MODE(x) (((x) & 0x1) << 3)
+#define ADXL372_INT1_MAP_INACT_MSK BIT(4)
+#define ADXL372_INT1_MAP_INACT_MODE(x) (((x) & 0x1) << 4)
+#define ADXL372_INT1_MAP_ACT_MSK BIT(5)
+#define ADXL372_INT1_MAP_ACT_MODE(x) (((x) & 0x1) << 5)
+#define ADXL372_INT1_MAP_AWAKE_MSK BIT(6)
+#define ADXL372_INT1_MAP_AWAKE_MODE(x) (((x) & 0x1) << 6)
+#define ADXL372_INT1_MAP_LOW_MSK BIT(7)
+#define ADXL372_INT1_MAP_LOW_MODE(x) (((x) & 0x1) << 7)
+
+/* The ADXL372 includes a deep, 512 sample FIFO buffer */
+#define ADXL372_FIFO_SIZE 512
+
+/*
+ * At +/- 200g with 12-bit resolution, scale is computed as:
+ * (200 + 200) * 9.81 / (2^12 - 1) = 0.958241
+ */
+#define ADXL372_USCALE 958241
+
+enum adxl372_op_mode {
+ ADXL372_STANDBY,
+ ADXL372_WAKE_UP,
+ ADXL372_INSTANT_ON,
+ ADXL372_FULL_BW_MEASUREMENT,
+};
+
+enum adxl372_act_proc_mode {
+ ADXL372_DEFAULT,
+ ADXL372_LINKED,
+ ADXL372_LOOPED,
+};
+
+enum adxl372_th_activity {
+ ADXL372_ACTIVITY,
+ ADXL372_ACTIVITY2,
+ ADXL372_INACTIVITY,
+};
+
+enum adxl372_odr {
+ ADXL372_ODR_400HZ,
+ ADXL372_ODR_800HZ,
+ ADXL372_ODR_1600HZ,
+ ADXL372_ODR_3200HZ,
+ ADXL372_ODR_6400HZ,
+};
+
+enum adxl372_bandwidth {
+ ADXL372_BW_200HZ,
+ ADXL372_BW_400HZ,
+ ADXL372_BW_800HZ,
+ ADXL372_BW_1600HZ,
+ ADXL372_BW_3200HZ,
+};
+
+static const unsigned int adxl372_th_reg_high_addr[3] = {
+ [ADXL372_ACTIVITY] = ADXL372_X_THRESH_ACT_H,
+ [ADXL372_ACTIVITY2] = ADXL372_X_THRESH_ACT2_H,
+ [ADXL372_INACTIVITY] = ADXL372_X_THRESH_INACT_H,
+};
+
+enum adxl372_fifo_format {
+ ADXL372_XYZ_FIFO,
+ ADXL372_X_FIFO,
+ ADXL372_Y_FIFO,
+ ADXL372_XY_FIFO,
+ ADXL372_Z_FIFO,
+ ADXL372_XZ_FIFO,
+ ADXL372_YZ_FIFO,
+ ADXL372_XYZ_PEAK_FIFO,
+};
+
+enum adxl372_fifo_mode {
+ ADXL372_FIFO_BYPASSED,
+ ADXL372_FIFO_STREAMED,
+ ADXL372_FIFO_TRIGGERED,
+ ADXL372_FIFO_OLD_SAVED
+};
+
+static const int adxl372_samp_freq_tbl[5] = {
+ 400, 800, 1600, 3200, 6400,
+};
+
+static const int adxl372_bw_freq_tbl[5] = {
+ 200, 400, 800, 1600, 3200,
+};
+
+struct adxl372_axis_lookup {
+ unsigned int bits;
+ enum adxl372_fifo_format fifo_format;
+};
+
+static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = {
+ { BIT(0), ADXL372_X_FIFO },
+ { BIT(1), ADXL372_Y_FIFO },
+ { BIT(2), ADXL372_Z_FIFO },
+ { BIT(0) | BIT(1), ADXL372_XY_FIFO },
+ { BIT(0) | BIT(2), ADXL372_XZ_FIFO },
+ { BIT(1) | BIT(2), ADXL372_YZ_FIFO },
+ { BIT(0) | BIT(1) | BIT(2), ADXL372_XYZ_FIFO },
+};
+
+#define ADXL372_ACCEL_CHANNEL(index, reg, axis) { \
+ .type = IIO_ACCEL, \
+ .address = reg, \
+ .modified = 1, \
+ .channel2 = IIO_MOD_##axis, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
+ .scan_index = index, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 12, \
+ .storagebits = 16, \
+ .shift = 4, \
+ }, \
+}
+
+static const struct iio_chan_spec adxl372_channels[] = {
+ ADXL372_ACCEL_CHANNEL(0, ADXL372_X_DATA_H, X),
+ ADXL372_ACCEL_CHANNEL(1, ADXL372_Y_DATA_H, Y),
+ ADXL372_ACCEL_CHANNEL(2, ADXL372_Z_DATA_H, Z),
+};
+
+struct adxl372_state {
+ int irq;
+ struct device *dev;
+ struct regmap *regmap;
+ struct iio_trigger *dready_trig;
+ enum adxl372_fifo_mode fifo_mode;
+ enum adxl372_fifo_format fifo_format;
+ enum adxl372_op_mode op_mode;
+ enum adxl372_act_proc_mode act_proc_mode;
+ enum adxl372_odr odr;
+ enum adxl372_bandwidth bw;
+ u32 act_time_ms;
+ u32 inact_time_ms;
+ u8 fifo_set_size;
+ u8 int1_bitmask;
+ u8 int2_bitmask;
+ u16 watermark;
+ __be16 fifo_buf[ADXL372_FIFO_SIZE];
+};
+
+static const unsigned long adxl372_channel_masks[] = {
+ BIT(0), BIT(1), BIT(2),
+ BIT(0) | BIT(1),
+ BIT(0) | BIT(2),
+ BIT(1) | BIT(2),
+ BIT(0) | BIT(1) | BIT(2),
+ 0
+};
+
+static int adxl372_read_axis(struct adxl372_state *st, u8 addr)
+{
+ __be16 regval;
+ int ret;
+
+ ret = regmap_bulk_read(st->regmap, addr, ®val, sizeof(regval));
+ if (ret < 0)
+ return ret;
+
+ return be16_to_cpu(regval);
+}
+
+static int adxl372_set_op_mode(struct adxl372_state *st,
+ enum adxl372_op_mode op_mode)
+{
+ int ret;
+
+ ret = regmap_update_bits(st->regmap, ADXL372_POWER_CTL,
+ ADXL372_POWER_CTL_MODE_MSK,
+ ADXL372_POWER_CTL_MODE(op_mode));
+ if (ret < 0)
+ return ret;
+
+ st->op_mode = op_mode;
+
+ return ret;
+}
+
+static int adxl372_set_odr(struct adxl372_state *st,
+ enum adxl372_odr odr)
+{
+ int ret;
+
+ ret = regmap_update_bits(st->regmap, ADXL372_TIMING,
+ ADXL372_TIMING_ODR_MSK,
+ ADXL372_TIMING_ODR_MODE(odr));
+ if (ret < 0)
+ return ret;
+
+ st->odr = odr;
+
+ return ret;
+}
+
+static int adxl372_find_closest_match(const int *array,
+ unsigned int size, int val)
+{
+ int i;
+
+ for (i = 0; i < size; i++) {
+ if (val <= array[i])
+ return i;
+ }
+
+ return size - 1;
+}
+
+static int adxl372_set_bandwidth(struct adxl372_state *st,
+ enum adxl372_bandwidth bw)
+{
+ int ret;
+
+ ret = regmap_update_bits(st->regmap, ADXL372_MEASURE,
+ ADXL372_MEASURE_BANDWIDTH_MSK,
+ ADXL372_MEASURE_BANDWIDTH_MODE(bw));
+ if (ret < 0)
+ return ret;
+
+ st->bw = bw;
+
+ return ret;
+}
+
+static int adxl372_set_act_proc_mode(struct adxl372_state *st,
+ enum adxl372_act_proc_mode mode)
+{
+ int ret;
+
+ ret = regmap_update_bits(st->regmap,
+ ADXL372_MEASURE,
+ ADXL372_MEASURE_LINKLOOP_MSK,
+ ADXL372_MEASURE_LINKLOOP_MODE(mode));
+ if (ret < 0)
+ return ret;
+
+ st->act_proc_mode = mode;
+
+ return ret;
+}
+
+static int adxl372_set_activity_threshold(struct adxl372_state *st,
+ enum adxl372_th_activity act,
+ bool ref_en, bool enable,
+ unsigned int threshold)
+{
+ unsigned char buf[6];
+ unsigned char th_reg_high_val, th_reg_low_val, th_reg_high_addr;
+
+ /* scale factor is 100 mg/code */
+ th_reg_high_val = (threshold / 100) >> 3;
+ th_reg_low_val = ((threshold / 100) << 5) | (ref_en << 1) | enable;
+ th_reg_high_addr = adxl372_th_reg_high_addr[act];
+
+ buf[0] = th_reg_high_val;
+ buf[1] = th_reg_low_val;
+ buf[2] = th_reg_high_val;
+ buf[3] = th_reg_low_val;
+ buf[4] = th_reg_high_val;
+ buf[5] = th_reg_low_val;
+
+ return regmap_bulk_write(st->regmap, th_reg_high_addr,
+ buf, ARRAY_SIZE(buf));
+}
+
+static int adxl372_set_activity_time_ms(struct adxl372_state *st,
+ unsigned int act_time_ms)
+{
+ unsigned int reg_val, scale_factor;
+ int ret;
+
+ /*
+ * 3.3 ms per code is the scale factor of the TIME_ACT register for
+ * ODR = 6400 Hz. It is 6.6 ms per code for ODR = 3200 Hz and below.
+ */
+ if (st->odr == ADXL372_ODR_6400HZ)
+ scale_factor = 3300;
+ else
+ scale_factor = 6600;
+
+ reg_val = DIV_ROUND_CLOSEST(act_time_ms * 1000, scale_factor);
+
+ /* TIME_ACT register is 8 bits wide */
+ if (reg_val > 0xFF)
+ reg_val = 0xFF;
+
+ ret = regmap_write(st->regmap, ADXL372_TIME_ACT, reg_val);
+ if (ret < 0)
+ return ret;
+
+ st->act_time_ms = act_time_ms;
+
+ return ret;
+}
+
+static int adxl372_set_inactivity_time_ms(struct adxl372_state *st,
+ unsigned int inact_time_ms)
+{
+ unsigned int reg_val_h, reg_val_l, res, scale_factor;
+ int ret;
+
+ /*
+ * 13 ms per code is the scale factor of the TIME_INACT register for
+ * ODR = 6400 Hz. It is 26 ms per code for ODR = 3200 Hz and below.
+ */
+ if (st->odr == ADXL372_ODR_6400HZ)
+ scale_factor = 13;
+ else
+ scale_factor = 26;
+
+ res = DIV_ROUND_CLOSEST(inact_time_ms, scale_factor);
+ reg_val_h = (res >> 8) & 0xFF;
+ reg_val_l = res & 0xFF;
+
+ ret = regmap_write(st->regmap, ADXL372_TIME_INACT_H, reg_val_h);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(st->regmap, ADXL372_TIME_INACT_L, reg_val_l);
+ if (ret < 0)
+ return ret;
+
+ st->inact_time_ms = inact_time_ms;
+
+ return ret;
+}
+
+static int adxl372_set_interrupts(struct adxl372_state *st,
+ unsigned char int1_bitmask,
+ unsigned char int2_bitmask)
+{
+ int ret;
+
+ ret = regmap_write(st->regmap, ADXL372_INT1_MAP, int1_bitmask);
+ if (ret < 0)
+ return ret;
+
+ return regmap_write(st->regmap, ADXL372_INT2_MAP, int2_bitmask);
+}
+
+static int adxl372_configure_fifo(struct adxl372_state *st)
+{
+ unsigned int fifo_samples, fifo_ctl;
+ int ret;
+
+ /* FIFO must be configured while in standby mode */
+ ret = adxl372_set_op_mode(st, ADXL372_STANDBY);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * watermark stores the number of sets; we need to write the FIFO
+ * registers with the number of samples
+ */
+ fifo_samples = (st->watermark * st->fifo_set_size);
+ fifo_ctl = ADXL372_FIFO_CTL_FORMAT_MODE(st->fifo_format) |
+ ADXL372_FIFO_CTL_MODE_MODE(st->fifo_mode) |
+ ADXL372_FIFO_CTL_SAMPLES_MODE(fifo_samples);
+
+ ret = regmap_write(st->regmap,
+ ADXL372_FIFO_SAMPLES, fifo_samples & 0xFF);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(st->regmap, ADXL372_FIFO_CTL, fifo_ctl);
+ if (ret < 0)
+ return ret;
+
+ return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT);
+}
+
+static int adxl372_get_status(struct adxl372_state *st,
+ u8 *status1, u8 *status2,
+ u16 *fifo_entries)
+{
+ __be32 buf;
+ u32 val;
+ int ret;
+
+ /* STATUS1, STATUS2, FIFO_ENTRIES2 and FIFO_ENTRIES are adjacent regs */
+ ret = regmap_bulk_read(st->regmap, ADXL372_STATUS_1,
+ &buf, sizeof(buf));
+ if (ret < 0)
+ return ret;
+
+ val = be32_to_cpu(buf);
+
+ *status1 = (val >> 24) & 0x0F;
+ *status2 = (val >> 16) & 0x0F;
+ /*
+ * FIFO_ENTRIES contains the least significant byte, and FIFO_ENTRIES2
+ * contains the two most significant bits
+ */
+ *fifo_entries = val & 0x3FF;
+
+ return ret;
+}
+
+static irqreturn_t adxl372_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct adxl372_state *st = iio_priv(indio_dev);
+ u8 status1, status2;
+ u16 fifo_entries;
+ int i, ret;
+
+ ret = adxl372_get_status(st, &status1, &status2, &fifo_entries);
+ if (ret < 0)
+ goto err;
+
+ if (st->fifo_mode != ADXL372_FIFO_BYPASSED &&
+ ADXL372_STATUS_1_FIFO_FULL(status1)) {
+ /*
+ * When reading data from multiple axes from the FIFO,
+ * to ensure that data is not overwritten and stored out
+ * of order at least one sample set must be left in the
+ * FIFO after every read.
+ */
+ fifo_entries -= st->fifo_set_size;
+
+ /* Read data from the FIFO */
+ ret = regmap_noinc_read(st->regmap, ADXL372_FIFO_DATA,
+ st->fifo_buf,
+ fifo_entries * sizeof(u16));
+ if (ret < 0)
+ goto err;
+
+ /* Each sample is 2 bytes */
+ for (i = 0; i < fifo_entries; i += st->fifo_set_size)
+ iio_push_to_buffers(indio_dev, &st->fifo_buf[i]);
+ }
+err:
+ iio_trigger_notify_done(indio_dev->trig);
+ return IRQ_HANDLED;
+}
+
+static int adxl372_setup(struct adxl372_state *st)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(st->regmap, ADXL372_DEVID, ®val);
+ if (ret < 0)
+ return ret;
+
+ if (regval != ADXL372_DEVID_VAL) {
+ dev_err(st->dev, "Invalid chip id %x\n", regval);
+ return -ENODEV;
+ }
+
+ /*
+ * Perform a software reset to make sure the device is in a consistent
+ * state after start up.
+ */
+ ret = regmap_write(st->regmap, ADXL372_RESET, ADXL372_RESET_CODE);
+ if (ret < 0)
+ return ret;
+
+ ret = adxl372_set_op_mode(st, ADXL372_STANDBY);
+ if (ret < 0)
+ return ret;
+
+ /* Set threshold for activity detection to 1g */
+ ret = adxl372_set_activity_threshold(st, ADXL372_ACTIVITY,
+ true, true, 1000);
+ if (ret < 0)
+ return ret;
+
+ /* Set threshold for inactivity detection to 100mg */
+ ret = adxl372_set_activity_threshold(st, ADXL372_INACTIVITY,
+ true, true, 100);
+ if (ret < 0)
+ return ret;
+
+ /* Set activity processing in Looped mode */
+ ret = adxl372_set_act_proc_mode(st, ADXL372_LOOPED);
+ if (ret < 0)
+ return ret;
+
+ ret = adxl372_set_odr(st, ADXL372_ODR_6400HZ);
+ if (ret < 0)
+ return ret;
+
+ ret = adxl372_set_bandwidth(st, ADXL372_BW_3200HZ);
+ if (ret < 0)
+ return ret;
+
+ /* Set activity timer to 1ms */
+ ret = adxl372_set_activity_time_ms(st, 1);
+ if (ret < 0)
+ return ret;
+
+ /* Set inactivity timer to 10s */
+ ret = adxl372_set_inactivity_time_ms(st, 10000);
+ if (ret < 0)
+ return ret;
+
+ /* Set the mode of operation to full bandwidth measurement mode */
+ return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT);
+}
+
+static int adxl372_reg_access(struct iio_dev *indio_dev,
+ unsigned int reg,
+ unsigned int writeval,
+ unsigned int *readval)
+{
+ struct adxl372_state *st = iio_priv(indio_dev);
+
+ if (readval)
+ return regmap_read(st->regmap, reg, readval);
+ else
+ return regmap_write(st->regmap, reg, writeval);
+}
+
+static int adxl372_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long info)
+{
+ struct adxl372_state *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = adxl372_read_axis(st, chan->address);
+ iio_device_release_direct_mode(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ *val = sign_extend32(ret >> chan->scan_type.shift,
+ chan->scan_type.realbits - 1);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 0;
+ *val2 = ADXL372_USCALE;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = adxl372_samp_freq_tbl[st->odr];
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *val = adxl372_bw_freq_tbl[st->bw];
+ return IIO_VAL_INT;
+ }
+
+ return -EINVAL;
+}
+
+static int adxl372_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long info)
+{
+ struct adxl372_state *st = iio_priv(indio_dev);
+ int odr_index, bw_index, ret;
+
+ switch (info) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ odr_index = adxl372_find_closest_match(adxl372_samp_freq_tbl,
+ ARRAY_SIZE(adxl372_samp_freq_tbl),
+ val);
+ ret = adxl372_set_odr(st, odr_index);
+ if (ret < 0)
+ return ret;
+ /*
+ * The timer period depends on the ODR selected.
+ * At 3200 Hz and below, it is 6.6 ms; at 6400 Hz, it is 3.3 ms
+ */
+ ret = adxl372_set_activity_time_ms(st, st->act_time_ms);
+ if (ret < 0)
+ return ret;
+ /*
+ * The timer period depends on the ODR selected.
+ * At 3200 Hz and below, it is 26 ms; at 6400 Hz, it is 13 ms
+ */
+ ret = adxl372_set_inactivity_time_ms(st, st->inact_time_ms);
+ if (ret < 0)
+ return ret;
+ /*
+ * The maximum bandwidth is constrained to at most half of
+ * the ODR to ensure that the Nyquist criteria is not violated
+ */
+ if (st->bw > odr_index)
+ ret = adxl372_set_bandwidth(st, odr_index);
+
+ return ret;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ bw_index = adxl372_find_closest_match(adxl372_bw_freq_tbl,
+ ARRAY_SIZE(adxl372_bw_freq_tbl),
+ val);
+ return adxl372_set_bandwidth(st, bw_index);
+ default:
+ return -EINVAL;
+ }
+}
+
+static ssize_t adxl372_show_filter_freq_avail(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct adxl372_state *st = iio_priv(indio_dev);
+ int i;
+ size_t len = 0;
+
+ for (i = 0; i <= st->odr; i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "%d ", adxl372_bw_freq_tbl[i]);
+
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static ssize_t adxl372_get_fifo_enabled(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct adxl372_state *st = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", st->fifo_mode);
+}
+
+static ssize_t adxl372_get_fifo_watermark(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct adxl372_state *st = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", st->watermark);
+}
+
+static IIO_CONST_ATTR(hwfifo_watermark_min, "1");
+static IIO_CONST_ATTR(hwfifo_watermark_max,
+ __stringify(ADXL372_FIFO_SIZE));
+static IIO_DEVICE_ATTR(hwfifo_watermark, 0444,
+ adxl372_get_fifo_watermark, NULL, 0);
+static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
+ adxl372_get_fifo_enabled, NULL, 0);
+
+static const struct attribute *adxl372_fifo_attributes[] = {
+ &iio_const_attr_hwfifo_watermark_min.dev_attr.attr,
+ &iio_const_attr_hwfifo_watermark_max.dev_attr.attr,
+ &iio_dev_attr_hwfifo_watermark.dev_attr.attr,
+ &iio_dev_attr_hwfifo_enabled.dev_attr.attr,
+ NULL,
+};
+
+static int adxl372_set_watermark(struct iio_dev *indio_dev, unsigned int val)
+{
+ struct adxl372_state *st = iio_priv(indio_dev);
+
+ if (val > ADXL372_FIFO_SIZE)
+ val = ADXL372_FIFO_SIZE;
+
+ st->watermark = val;
+
+ return 0;
+}
+
+static int adxl372_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct adxl372_state *st = iio_priv(indio_dev);
+ unsigned int mask;
+ int i, ret;
+
+ ret = iio_triggered_buffer_postenable(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ ret = adxl372_set_interrupts(st, ADXL372_INT1_MAP_FIFO_FULL_MSK, 0);
+ if (ret < 0)
+ goto err;
+
+ mask = *indio_dev->active_scan_mask;
+
+ for (i = 0; i < ARRAY_SIZE(adxl372_axis_lookup_table); i++) {
+ if (mask == adxl372_axis_lookup_table[i].bits)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(adxl372_axis_lookup_table)) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ st->fifo_format = adxl372_axis_lookup_table[i].fifo_format;
+ st->fifo_set_size = bitmap_weight(indio_dev->active_scan_mask,
+ indio_dev->masklength);
+ /*
+ * The 512 FIFO samples can be allotted in several ways, such as:
+ * 170 sample sets of concurrent 3-axis data
+ * 256 sample sets of concurrent 2-axis data (user selectable)
+ * 512 sample sets of single-axis data
+ */
+ if ((st->watermark * st->fifo_set_size) > ADXL372_FIFO_SIZE)
+ st->watermark = (ADXL372_FIFO_SIZE / st->fifo_set_size);
+
+ st->fifo_mode = ADXL372_FIFO_STREAMED;
+
+ ret = adxl372_configure_fifo(st);
+ if (ret < 0) {
+ st->fifo_mode = ADXL372_FIFO_BYPASSED;
+ adxl372_set_interrupts(st, 0, 0);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ iio_triggered_buffer_predisable(indio_dev);
+ return ret;
+}
+
+static int adxl372_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct adxl372_state *st = iio_priv(indio_dev);
+
+ adxl372_set_interrupts(st, 0, 0);
+ st->fifo_mode = ADXL372_FIFO_BYPASSED;
+ adxl372_configure_fifo(st);
+
+ return iio_triggered_buffer_predisable(indio_dev);
+}
+
+static const struct iio_buffer_setup_ops adxl372_buffer_ops = {
+ .postenable = adxl372_buffer_postenable,
+ .predisable = adxl372_buffer_predisable,
+};
+
+static int adxl372_dready_trig_set_state(struct iio_trigger *trig,
+ bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct adxl372_state *st = iio_priv(indio_dev);
+ unsigned long int mask = 0;
+
+ if (state)
+ mask = ADXL372_INT1_MAP_FIFO_FULL_MSK;
+
+ return adxl372_set_interrupts(st, mask, 0);
+}
+
+static int adxl372_validate_trigger(struct iio_dev *indio_dev,
+ struct iio_trigger *trig)
+{
+ struct adxl372_state *st = iio_priv(indio_dev);
+
+ if (st->dready_trig != trig)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct iio_trigger_ops adxl372_trigger_ops = {
+ .validate_device = &iio_trigger_validate_own_device,
+ .set_trigger_state = adxl372_dready_trig_set_state,
+};
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("400 800 1600 3200 6400");
+static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
+ 0444, adxl372_show_filter_freq_avail, NULL, 0);
+
+static struct attribute *adxl372_attributes[] = {
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group adxl372_attrs_group = {
+ .attrs = adxl372_attributes,
+};
+
+static const struct iio_info adxl372_info = {
+ .validate_trigger = &adxl372_validate_trigger,
+ .attrs = &adxl372_attrs_group,
+ .read_raw = adxl372_read_raw,
+ .write_raw = adxl372_write_raw,
+ .debugfs_reg_access = &adxl372_reg_access,
+ .hwfifo_set_watermark = adxl372_set_watermark,
+};
+
+bool adxl372_readable_noinc_reg(struct device *dev, unsigned int reg)
+{
+ return (reg == ADXL372_FIFO_DATA);
+}
+EXPORT_SYMBOL_GPL(adxl372_readable_noinc_reg);
+
+int adxl372_probe(struct device *dev, struct regmap *regmap,
+ int irq, const char *name)
+{
+ struct iio_dev *indio_dev;
+ struct adxl372_state *st;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ dev_set_drvdata(dev, indio_dev);
+
+ st->dev = dev;
+ st->regmap = regmap;
+ st->irq = irq;
+
+ indio_dev->channels = adxl372_channels;
+ indio_dev->num_channels = ARRAY_SIZE(adxl372_channels);
+ indio_dev->available_scan_masks = adxl372_channel_masks;
+ indio_dev->dev.parent = dev;
+ indio_dev->name = name;
+ indio_dev->info = &adxl372_info;
+ indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
+
+ ret = adxl372_setup(st);
+ if (ret < 0) {
+ dev_err(dev, "ADXL372 setup failed\n");
+ return ret;
+ }
+
+ ret = devm_iio_triggered_buffer_setup(dev,
+ indio_dev, NULL,
+ adxl372_trigger_handler,
+ &adxl372_buffer_ops);
+ if (ret < 0)
+ return ret;
+
+ iio_buffer_set_attrs(indio_dev->buffer, adxl372_fifo_attributes);
+
+ if (st->irq) {
+ st->dready_trig = devm_iio_trigger_alloc(dev,
+ "%s-dev%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (st->dready_trig == NULL)
+ return -ENOMEM;
+
+ st->dready_trig->ops = &adxl372_trigger_ops;
+ st->dready_trig->dev.parent = dev;
+ iio_trigger_set_drvdata(st->dready_trig, indio_dev);
+ ret = devm_iio_trigger_register(dev, st->dready_trig);
+ if (ret < 0)
+ return ret;
+
+ indio_dev->trig = iio_trigger_get(st->dready_trig);
+
+ ret = devm_request_threaded_irq(dev, st->irq,
+ iio_trigger_generic_data_rdy_poll,
+ NULL,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ indio_dev->name, st->dready_trig);
+ if (ret < 0)
+ return ret;
+ }
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_GPL(adxl372_probe);
+
+MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices ADXL372 3-axis accelerometer driver");
+MODULE_LICENSE("GPL");