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Message-ID: <20200829184350.5ee8c3db@archlinux>
Date: Sat, 29 Aug 2020 18:43:50 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: <alexandru.tachici@...log.com>
Cc: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] iio: accel: adxl372: Add support for FIFO peak
mode
On Mon, 10 Aug 2020 12:32:56 +0300
<alexandru.tachici@...log.com> wrote:
> From: Stefan Popa <stefan.popa@...log.com>
>
> By default, if all three channels (x, y, z) are enabled, sample sets of
> concurrent 3-axis data is stored in the FIFO. This patch adds the option
> to configure the FIFO to store peak acceleration (x, y and z) of every
> over-threshold event. When pushing to iio buffer we push only enabled
> axis data.
>
> Currently the driver configures adxl372 to work in loop mode.
> The inactivity and activity timings decide how fast the chip
> will loop through the awake and waiting states and the
> thresholds on x,y,z axis decide when activity or inactivity
> will be detected.
>
> This patch adds standard events sysfs entries for the inactivity
> and activity timings: thresh_falling_period/thresh_rising_period
> and for the in_accel_x_thresh_falling/rising_value.
>
> Signed-off-by: Stefan Popa <stefan.popa@...log.com>
> Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
Hi Alexandru,
This didn't go in remotely cleanly because of fuzz from moving the
pollfunc attach / detach into the core which seems to have crossed with it.
I think I have it correct, but please check and let me know if there
are any problems.
Pushed out as testing for the autobuilders to poke at it as well.
thanks,
Jonathan
> ---
> drivers/iio/accel/adxl372.c | 302 +++++++++++++++++++++++++++++++++++-
> 1 file changed, 294 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
> index 67b8817995c0..4cad16e2f7b7 100644
> --- a/drivers/iio/accel/adxl372.c
> +++ b/drivers/iio/accel/adxl372.c
> @@ -5,6 +5,7 @@
> * Copyright 2018 Analog Devices Inc.
> */
>
> +#include <linux/bitfield.h>
> #include <linux/bitops.h>
> #include <linux/interrupt.h>
> #include <linux/irq.h>
> @@ -113,6 +114,11 @@
> #define ADXL372_STATUS_1_AWAKE(x) (((x) >> 6) & 0x1)
> #define ADXL372_STATUS_1_ERR_USR_REGS(x) (((x) >> 7) & 0x1)
>
> +/* ADXL372_STATUS_2 */
> +#define ADXL372_STATUS_2_INACT(x) (((x) >> 4) & 0x1)
> +#define ADXL372_STATUS_2_ACT(x) (((x) >> 5) & 0x1)
> +#define ADXL372_STATUS_2_AC2(x) (((x) >> 6) & 0x1)
> +
> /* ADXL372_INT1_MAP */
> #define ADXL372_INT1_MAP_DATA_RDY_MSK BIT(0)
> #define ADXL372_INT1_MAP_DATA_RDY_MODE(x) (((x) & 0x1) << 0)
> @@ -131,8 +137,17 @@
> #define ADXL372_INT1_MAP_LOW_MSK BIT(7)
> #define ADXL372_INT1_MAP_LOW_MODE(x) (((x) & 0x1) << 7)
>
> +/* ADX372_THRESH */
> +#define ADXL372_THRESH_VAL_H_MSK GENMASK(10, 3)
> +#define ADXL372_THRESH_VAL_H_SEL(x) FIELD_GET(ADXL372_THRESH_VAL_H_MSK, x)
> +#define ADXL372_THRESH_VAL_L_MSK GENMASK(2, 0)
> +#define ADXL372_THRESH_VAL_L_SEL(x) FIELD_GET(ADXL372_THRESH_VAL_L_MSK, x)
> +
> /* The ADXL372 includes a deep, 512 sample FIFO buffer */
> #define ADXL372_FIFO_SIZE 512
> +#define ADXL372_X_AXIS_EN(x) ((x) & BIT(0))
> +#define ADXL372_Y_AXIS_EN(x) ((x) & BIT(1))
> +#define ADXL372_Z_AXIS_EN(x) ((x) & BIT(2))
>
> /*
> * At +/- 200g with 12-bit resolution, scale is computed as:
> @@ -222,6 +237,20 @@ static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = {
> { BIT(0) | BIT(1) | BIT(2), ADXL372_XYZ_FIFO },
> };
>
> +static const struct iio_event_spec adxl372_events[] = {
> + {
> + .type = IIO_EV_TYPE_THRESH,
> + .dir = IIO_EV_DIR_RISING,
> + .mask_separate = BIT(IIO_EV_INFO_VALUE),
> + .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_ENABLE),
> + }, {
> + .type = IIO_EV_TYPE_THRESH,
> + .dir = IIO_EV_DIR_FALLING,
> + .mask_separate = BIT(IIO_EV_INFO_VALUE),
> + .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_ENABLE),
> + },
> +};
> +
> #define ADXL372_ACCEL_CHANNEL(index, reg, axis) { \
> .type = IIO_ACCEL, \
> .address = reg, \
> @@ -238,6 +267,8 @@ static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = {
> .storagebits = 16, \
> .shift = 4, \
> }, \
> + .event_spec = adxl372_events, \
> + .num_event_specs = ARRAY_SIZE(adxl372_events) \
> }
>
> static const struct iio_chan_spec adxl372_channels[] = {
> @@ -251,8 +282,10 @@ struct adxl372_state {
> struct device *dev;
> struct regmap *regmap;
> struct iio_trigger *dready_trig;
> + struct iio_trigger *peak_datardy_trig;
> enum adxl372_fifo_mode fifo_mode;
> enum adxl372_fifo_format fifo_format;
> + unsigned int fifo_axis_mask;
> enum adxl372_op_mode op_mode;
> enum adxl372_act_proc_mode act_proc_mode;
> enum adxl372_odr odr;
> @@ -264,6 +297,8 @@ struct adxl372_state {
> u8 int2_bitmask;
> u16 watermark;
> __be16 fifo_buf[ADXL372_FIFO_SIZE];
> + bool peak_fifo_mode_en;
> + struct mutex threshold_m; /* lock for threshold */
> };
>
> static const unsigned long adxl372_channel_masks[] = {
> @@ -275,6 +310,45 @@ static const unsigned long adxl372_channel_masks[] = {
> 0
> };
>
> +static ssize_t adxl372_read_threshold_value(struct iio_dev *indio_dev, unsigned int addr,
> + u16 *threshold)
> +{
> + struct adxl372_state *st = iio_priv(indio_dev);
> + __be16 raw_regval;
> + u16 regval;
> + int ret;
> +
> + ret = regmap_bulk_read(st->regmap, addr, &raw_regval, sizeof(raw_regval));
> + if (ret < 0)
> + return ret;
> +
> + regval = be16_to_cpu(raw_regval);
> + regval >>= 5;
> +
> + *threshold = regval;
> +
> + return 0;
> +}
> +
> +static ssize_t adxl372_write_threshold_value(struct iio_dev *indio_dev, unsigned int addr,
> + u16 threshold)
> +{
> + struct adxl372_state *st = iio_priv(indio_dev);
> + int ret;
> +
> + mutex_lock(&st->threshold_m);
> + ret = regmap_write(st->regmap, addr, ADXL372_THRESH_VAL_H_SEL(threshold));
> + if (ret < 0)
> + return ret;
> +
> + ret = regmap_update_bits(st->regmap, addr + 1, GENMASK(7, 5),
> + ADXL372_THRESH_VAL_L_SEL(threshold) << 5);
> +
> + mutex_unlock(&st->threshold_m);
> +
> + return ret;
> +}
> +
> static int adxl372_read_axis(struct adxl372_state *st, u8 addr)
> {
> __be16 regval;
> @@ -522,6 +596,39 @@ static int adxl372_get_status(struct adxl372_state *st,
> return ret;
> }
>
> +static void adxl372_arrange_axis_data(struct adxl372_state *st, __be16 *sample)
> +{
> + __be16 axis_sample[3];
> + int i = 0;
> +
> + memset(axis_sample, 0, 3 * sizeof(__be16));
> + if (ADXL372_X_AXIS_EN(st->fifo_axis_mask))
> + axis_sample[i++] = sample[0];
> + if (ADXL372_Y_AXIS_EN(st->fifo_axis_mask))
> + axis_sample[i++] = sample[1];
> + if (ADXL372_Z_AXIS_EN(st->fifo_axis_mask))
> + axis_sample[i++] = sample[2];
> +
> + memcpy(sample, axis_sample, 3 * sizeof(__be16));
> +}
> +
> +static void adxl372_push_event(struct iio_dev *indio_dev, s64 timestamp, u8 status2)
> +{
> + unsigned int ev_dir = IIO_EV_DIR_NONE;
> +
> + if (ADXL372_STATUS_2_ACT(status2))
> + ev_dir = IIO_EV_DIR_RISING;
> +
> + if (ADXL372_STATUS_2_INACT(status2))
> + ev_dir = IIO_EV_DIR_FALLING;
> +
> + if (ev_dir != IIO_EV_DIR_NONE)
> + iio_push_event(indio_dev,
> + IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X_OR_Y_OR_Z,
> + IIO_EV_TYPE_THRESH, ev_dir),
> + timestamp);
> +}
> +
> static irqreturn_t adxl372_trigger_handler(int irq, void *p)
> {
> struct iio_poll_func *pf = p;
> @@ -535,6 +642,8 @@ static irqreturn_t adxl372_trigger_handler(int irq, void *p)
> if (ret < 0)
> goto err;
>
> + adxl372_push_event(indio_dev, iio_get_time_ns(indio_dev), status2);
> +
> if (st->fifo_mode != ADXL372_FIFO_BYPASSED &&
> ADXL372_STATUS_1_FIFO_FULL(status1)) {
> /*
> @@ -553,8 +662,12 @@ static irqreturn_t adxl372_trigger_handler(int irq, void *p)
> goto err;
>
> /* Each sample is 2 bytes */
> - for (i = 0; i < fifo_entries; i += st->fifo_set_size)
> + for (i = 0; i < fifo_entries; i += st->fifo_set_size) {
> + /* filter peak detection data */
> + if (st->peak_fifo_mode_en)
> + adxl372_arrange_axis_data(st, &st->fifo_buf[i]);
> iio_push_to_buffers(indio_dev, &st->fifo_buf[i]);
> + }
> }
> err:
> iio_trigger_notify_done(indio_dev->trig);
> @@ -722,6 +835,129 @@ static int adxl372_write_raw(struct iio_dev *indio_dev,
> }
> }
>
> +static int adxl372_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)
> +{
> + struct adxl372_state *st = iio_priv(indio_dev);
> + unsigned int addr;
> + u16 raw_value;
> + int ret;
> +
> + switch (info) {
> + case IIO_EV_INFO_VALUE:
> + switch (dir) {
> + case IIO_EV_DIR_RISING:
> + addr = ADXL372_X_THRESH_ACT_H + 2 * chan->scan_index;
> + ret = adxl372_read_threshold_value(indio_dev, addr, &raw_value);
> + if (ret < 0)
> + return ret;
> + *val = raw_value * ADXL372_USCALE;
> + *val2 = 1000000;
> + return IIO_VAL_FRACTIONAL;
> + case IIO_EV_DIR_FALLING:
> + addr = ADXL372_X_THRESH_INACT_H + 2 * chan->scan_index;
> + ret = adxl372_read_threshold_value(indio_dev, addr, &raw_value);
> + if (ret < 0)
> + return ret;
> + *val = raw_value * ADXL372_USCALE;
> + *val2 = 1000000;
> + return IIO_VAL_FRACTIONAL;
> + default:
> + return -EINVAL;
> + }
> + case IIO_EV_INFO_PERIOD:
> + switch (dir) {
> + case IIO_EV_DIR_RISING:
> + *val = st->act_time_ms;
> + *val2 = 1000;
> + return IIO_VAL_FRACTIONAL;
> + case IIO_EV_DIR_FALLING:
> + *val = st->inact_time_ms;
> + *val2 = 1000;
> + return IIO_VAL_FRACTIONAL;
> + default:
> + return -EINVAL;
> + }
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int adxl372_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 adxl372_state *st = iio_priv(indio_dev);
> + unsigned int val_ms;
> + unsigned int addr;
> + u16 raw_val;
> +
> + switch (info) {
> + case IIO_EV_INFO_VALUE:
> + raw_val = DIV_ROUND_UP(val * 1000000, ADXL372_USCALE);
> + switch (dir) {
> + case IIO_EV_DIR_RISING:
> + addr = ADXL372_X_THRESH_ACT_H + 2 * chan->scan_index;
> + return adxl372_write_threshold_value(indio_dev, addr, raw_val);
> + case IIO_EV_DIR_FALLING:
> + addr = ADXL372_X_THRESH_INACT_H + 2 * chan->scan_index;
> + return adxl372_write_threshold_value(indio_dev, addr, raw_val);
> + default:
> + return -EINVAL;
> + }
> + case IIO_EV_INFO_PERIOD:
> + val_ms = val * 1000 + DIV_ROUND_UP(val2, 1000);
> + switch (dir) {
> + case IIO_EV_DIR_RISING:
> + return adxl372_set_activity_time_ms(st, val_ms);
> + case IIO_EV_DIR_FALLING:
> + return adxl372_set_inactivity_time_ms(st, val_ms);
> + default:
> + return -EINVAL;
> + }
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int adxl372_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 adxl372_state *st = iio_priv(indio_dev);
> +
> + switch (dir) {
> + case IIO_EV_DIR_RISING:
> + return FIELD_GET(ADXL372_INT1_MAP_ACT_MSK, st->int1_bitmask);
> + case IIO_EV_DIR_FALLING:
> + return FIELD_GET(ADXL372_INT1_MAP_INACT_MSK, st->int1_bitmask);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int adxl372_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 adxl372_state *st = iio_priv(indio_dev);
> +
> + switch (dir) {
> + case IIO_EV_DIR_RISING:
> + set_mask_bits(&st->int1_bitmask, ADXL372_INT1_MAP_ACT_MSK,
> + ADXL372_INT1_MAP_ACT_MODE(state));
> + break;
> + case IIO_EV_DIR_FALLING:
> + set_mask_bits(&st->int1_bitmask, ADXL372_INT1_MAP_INACT_MSK,
> + ADXL372_INT1_MAP_INACT_MODE(state));
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return adxl372_set_interrupts(st, st->int1_bitmask, 0);
> +}
> +
> static ssize_t adxl372_show_filter_freq_avail(struct device *dev,
> struct device_attribute *attr,
> char *buf)
> @@ -798,7 +1034,8 @@ static int adxl372_buffer_postenable(struct iio_dev *indio_dev)
> if (ret < 0)
> return ret;
>
> - ret = adxl372_set_interrupts(st, ADXL372_INT1_MAP_FIFO_FULL_MSK, 0);
> + st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK;
> + ret = adxl372_set_interrupts(st, st->int1_bitmask, 0);
> if (ret < 0)
> goto err;
>
> @@ -815,13 +1052,22 @@ static int adxl372_buffer_postenable(struct iio_dev *indio_dev)
> }
>
> st->fifo_format = adxl372_axis_lookup_table[i].fifo_format;
> + st->fifo_axis_mask = adxl372_axis_lookup_table[i].bits;
> st->fifo_set_size = bitmap_weight(indio_dev->active_scan_mask,
> indio_dev->masklength);
> +
> + /* Configure the FIFO to store sets of impact event peak. */
> + if (st->peak_fifo_mode_en) {
> + st->fifo_set_size = 3;
> + st->fifo_format = ADXL372_XYZ_PEAK_FIFO;
> + }
> +
> /*
> * 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
> + * 170 sets of impact event peak (x, y, z)
> */
> if ((st->watermark * st->fifo_set_size) > ADXL372_FIFO_SIZE)
> st->watermark = (ADXL372_FIFO_SIZE / st->fifo_set_size);
> @@ -831,7 +1077,8 @@ static int adxl372_buffer_postenable(struct iio_dev *indio_dev)
> ret = adxl372_configure_fifo(st);
> if (ret < 0) {
> st->fifo_mode = ADXL372_FIFO_BYPASSED;
> - adxl372_set_interrupts(st, 0, 0);
> + st->int1_bitmask &= ~ADXL372_INT1_MAP_FIFO_FULL_MSK;
> + adxl372_set_interrupts(st, st->int1_bitmask, 0);
> goto err;
> }
>
> @@ -846,7 +1093,8 @@ 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->int1_bitmask &= ~ADXL372_INT1_MAP_FIFO_FULL_MSK;
> + adxl372_set_interrupts(st, st->int1_bitmask, 0);
> st->fifo_mode = ADXL372_FIFO_BYPASSED;
> adxl372_configure_fifo(st);
>
> @@ -863,12 +1111,11 @@ static int adxl372_dready_trig_set_state(struct iio_trigger *trig,
> {
> 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;
> + st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK;
>
> - return adxl372_set_interrupts(st, mask, 0);
> + return adxl372_set_interrupts(st, st->int1_bitmask, 0);
> }
>
> static int adxl372_validate_trigger(struct iio_dev *indio_dev,
> @@ -876,7 +1123,7 @@ static int adxl372_validate_trigger(struct iio_dev *indio_dev,
> {
> struct adxl372_state *st = iio_priv(indio_dev);
>
> - if (st->dready_trig != trig)
> + if (st->dready_trig != trig && st->peak_datardy_trig != trig)
> return -EINVAL;
>
> return 0;
> @@ -887,6 +1134,25 @@ static const struct iio_trigger_ops adxl372_trigger_ops = {
> .set_trigger_state = adxl372_dready_trig_set_state,
> };
>
> +static int adxl372_peak_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);
> +
> + if (state)
> + st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK;
> +
> + st->peak_fifo_mode_en = state;
> +
> + return adxl372_set_interrupts(st, st->int1_bitmask, 0);
> +}
> +
> +static const struct iio_trigger_ops adxl372_peak_data_trigger_ops = {
> + .validate_device = &iio_trigger_validate_own_device,
> + .set_trigger_state = adxl372_peak_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);
> @@ -906,6 +1172,10 @@ static const struct iio_info adxl372_info = {
> .attrs = &adxl372_attrs_group,
> .read_raw = adxl372_read_raw,
> .write_raw = adxl372_write_raw,
> + .read_event_config = adxl372_read_event_config,
> + .write_event_config = adxl372_write_event_config,
> + .read_event_value = adxl372_read_event_value,
> + .write_event_value = adxl372_write_event_value,
> .debugfs_reg_access = &adxl372_reg_access,
> .hwfifo_set_watermark = adxl372_set_watermark,
> };
> @@ -934,6 +1204,8 @@ int adxl372_probe(struct device *dev, struct regmap *regmap,
> st->regmap = regmap;
> st->irq = irq;
>
> + mutex_init(&st->threshold_m);
> +
> indio_dev->channels = adxl372_channels;
> indio_dev->num_channels = ARRAY_SIZE(adxl372_channels);
> indio_dev->available_scan_masks = adxl372_channel_masks;
> @@ -965,13 +1237,27 @@ int adxl372_probe(struct device *dev, struct regmap *regmap,
> if (st->dready_trig == NULL)
> return -ENOMEM;
>
> + st->peak_datardy_trig = devm_iio_trigger_alloc(dev,
> + "%s-dev%d-peak",
> + indio_dev->name,
> + indio_dev->id);
> + if (!st->peak_datardy_trig)
> + return -ENOMEM;
> +
> st->dready_trig->ops = &adxl372_trigger_ops;
> + st->peak_datardy_trig->ops = &adxl372_peak_data_trigger_ops;
> st->dready_trig->dev.parent = dev;
> + st->peak_datardy_trig->dev.parent = dev;
> iio_trigger_set_drvdata(st->dready_trig, indio_dev);
> + iio_trigger_set_drvdata(st->peak_datardy_trig, indio_dev);
> ret = devm_iio_trigger_register(dev, st->dready_trig);
> if (ret < 0)
> return ret;
>
> + ret = devm_iio_trigger_register(dev, st->peak_datardy_trig);
> + if (ret < 0)
> + return ret;
> +
> indio_dev->trig = iio_trigger_get(st->dready_trig);
>
> ret = devm_request_threaded_irq(dev, st->irq,
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