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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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