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iio: accel: adxl355: Add triggered buffer support 

Provide a way for continuous data capture by setting up buffer support. The
data ready signal exposed at the DRDY pin of the ADXL355 is exploited as
a hardware interrupt which triggers to fill the buffer.

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20210903184312.21009-3-puranjay12@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Puranjay Mohan 2021-09-04 00:13:12 +05:30 committed by Jonathan Cameron
parent 86ff6cb15f
commit 327a0eaf19
2 changed files with 158 additions and 1 deletions
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4
drivers/iio/accel/Kconfig
View File

@ -98,6 +98,8 @@ config ADXL355_I2C
depends on I2C
select ADXL355
select REGMAP_I2C
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
help
Say Y here if you want to build i2c support for the Analog Devices
ADXL355 3-axis digital accelerometer.
@ -111,6 +113,8 @@ config ADXL355_SPI
depends on SPI
select ADXL355
select REGMAP_SPI
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
help
Say Y here if you want to build spi support for the Analog Devices
ADXL355 3-axis digital accelerometer.

155
drivers/iio/accel/adxl355_core.c
View File

@ -9,11 +9,16 @@
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/limits.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>
#include <asm/unaligned.h>
@ -46,6 +51,7 @@
#define ADXL355_RANGE_REG 0x2C
#define ADXL355_POWER_CTL_REG 0x2D
#define ADXL355_POWER_CTL_MODE_MSK GENMASK(1, 0)
#define ADXL355_POWER_CTL_DRDY_MSK BIT(2)
#define ADXL355_SELF_TEST_REG 0x2E
#define ADXL355_RESET_REG 0x2F
@ -165,7 +171,14 @@ struct adxl355_data {
enum adxl355_hpf_3db hpf_3db;
int calibbias[3];
int adxl355_hpf_3db_table[7][2];
u8 transf_buf[3] ____cacheline_aligned;
struct iio_trigger *dready_trig;
union {
u8 transf_buf[3];
struct {
u8 buf[14];
s64 ts;
} buffer;
} ____cacheline_aligned;
};
static int adxl355_set_op_mode(struct adxl355_data *data,
@ -186,6 +199,23 @@ static int adxl355_set_op_mode(struct adxl355_data *data,
return ret;
}
static int adxl355_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct adxl355_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->lock);
ret = regmap_update_bits(data->regmap, ADXL355_POWER_CTL_REG,
ADXL355_POWER_CTL_DRDY_MSK,
FIELD_PREP(ADXL355_POWER_CTL_DRDY_MSK,
state ? 0 : 1));
mutex_unlock(&data->lock);
return ret;
}
static void adxl355_fill_3db_frequency_table(struct adxl355_data *data)
{
u32 multiplier;
@ -246,6 +276,12 @@ static int adxl355_setup(struct adxl355_data *data)
if (ret)
return ret;
ret = regmap_update_bits(data->regmap, ADXL355_POWER_CTL_REG,
ADXL355_POWER_CTL_DRDY_MSK,
FIELD_PREP(ADXL355_POWER_CTL_DRDY_MSK, 1));
if (ret)
return ret;
adxl355_fill_3db_frequency_table(data);
return adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
@ -527,12 +563,74 @@ static int adxl355_read_avail(struct iio_dev *indio_dev,
}
}
static const unsigned long adxl355_avail_scan_masks[] = {
GENMASK(3, 0),
0
};
static const struct iio_info adxl355_info = {
.read_raw = adxl355_read_raw,
.write_raw = adxl355_write_raw,
.read_avail = &adxl355_read_avail,
};
static const struct iio_trigger_ops adxl355_trigger_ops = {
.set_trigger_state = &adxl355_data_rdy_trigger_set_state,
.validate_device = &iio_trigger_validate_own_device,
};
static irqreturn_t adxl355_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct adxl355_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->lock);
/*
* data->buffer is used both for triggered buffer support
* and read/write_raw(), hence, it has to be zeroed here before usage.
*/
data->buffer.buf[0] = 0;
/*
* The acceleration data is 24 bits and big endian. It has to be saved
* in 32 bits, hence, it is saved in the 2nd byte of the 4 byte buffer.
* The buf array is 14 bytes as it includes 3x4=12 bytes for
* accelaration data of x, y, and z axis. It also includes 2 bytes for
* temperature data.
*/
ret = regmap_bulk_read(data->regmap, ADXL355_XDATA3_REG,
&data->buffer.buf[1], 3);
if (ret)
goto out_unlock_notify;
ret = regmap_bulk_read(data->regmap, ADXL355_YDATA3_REG,
&data->buffer.buf[5], 3);
if (ret)
goto out_unlock_notify;
ret = regmap_bulk_read(data->regmap, ADXL355_ZDATA3_REG,
&data->buffer.buf[9], 3);
if (ret)
goto out_unlock_notify;
ret = regmap_bulk_read(data->regmap, ADXL355_TEMP2_REG,
&data->buffer.buf[12], 2);
if (ret)
goto out_unlock_notify;
iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
pf->timestamp);
out_unlock_notify:
mutex_unlock(&data->lock);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
#define ADXL355_ACCEL_CHANNEL(index, reg, axis) { \
.type = IIO_ACCEL, \
.address = reg, \
@ -546,6 +644,7 @@ static const struct iio_info adxl355_info = {
.info_mask_shared_by_type_available = \
BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY), \
.scan_index = index, \
.scan_type = { \
.sign = 's', \
.realbits = 20, \
@ -565,6 +664,7 @@ static const struct iio_chan_spec adxl355_channels[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET),
.scan_index = 3,
.scan_type = {
.sign = 's',
.realbits = 12,
@ -572,14 +672,48 @@ static const struct iio_chan_spec adxl355_channels[] = {
.endianness = IIO_BE,
},
},
IIO_CHAN_SOFT_TIMESTAMP(4),
};
static int adxl355_probe_trigger(struct iio_dev *indio_dev, int irq)
{
struct adxl355_data *data = iio_priv(indio_dev);
int ret;
data->dready_trig = devm_iio_trigger_alloc(data->dev, "%s-dev%d",
indio_dev->name,
iio_device_id(indio_dev));
if (!data->dready_trig)
return -ENOMEM;
data->dready_trig->ops = &adxl355_trigger_ops;
iio_trigger_set_drvdata(data->dready_trig, indio_dev);
ret = devm_request_irq(data->dev, irq,
&iio_trigger_generic_data_rdy_poll,
IRQF_ONESHOT, "adxl355_irq", data->dready_trig);
if (ret)
return dev_err_probe(data->dev, ret, "request irq %d failed\n",
irq);
ret = devm_iio_trigger_register(data->dev, data->dready_trig);
if (ret) {
dev_err(data->dev, "iio trigger register failed\n");
return ret;
}
indio_dev->trig = iio_trigger_get(data->dready_trig);
return 0;
}
int adxl355_core_probe(struct device *dev, struct regmap *regmap,
const char *name)
{
struct adxl355_data *data;
struct iio_dev *indio_dev;
int ret;
int irq;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
@ -596,6 +730,7 @@ int adxl355_core_probe(struct device *dev, struct regmap *regmap,
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = adxl355_channels;
indio_dev->num_channels = ARRAY_SIZE(adxl355_channels);
indio_dev->available_scan_masks = adxl355_avail_scan_masks;
ret = adxl355_setup(data);
if (ret) {
@ -603,6 +738,24 @@ int adxl355_core_probe(struct device *dev, struct regmap *regmap,
return ret;
}
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
&iio_pollfunc_store_time,
&adxl355_trigger_handler, NULL);
if (ret) {
dev_err(dev, "iio triggered buffer setup failed\n");
return ret;
}
/*
* TODO: Would be good to move it to the generic version.
*/
irq = of_irq_get_byname(dev->of_node, "DRDY");
if (irq > 0) {
ret = adxl355_probe_trigger(indio_dev, irq);
if (ret)
return ret;
}
return devm_iio_device_register(dev, indio_dev);
}
EXPORT_SYMBOL_GPL(adxl355_core_probe);