*/
#include <linux/bitfield.h>
+#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/overflow.h>
+#include <linux/property.h>
#include <linux/regmap.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/kfifo_buf.h>
+
#include "adxl313.h"
+#define ADXL313_INT_NONE U8_MAX
+#define ADXL313_INT1 1
+#define ADXL313_INT2 2
+
+#define ADXL313_REG_XYZ_BASE ADXL313_REG_DATA_AXIS(0)
+
static const struct regmap_range adxl312_readable_reg_range[] = {
regmap_reg_range(ADXL313_REG_DEVID0, ADXL313_REG_DEVID0),
regmap_reg_range(ADXL313_REG_OFS_AXIS(0), ADXL313_REG_OFS_AXIS(2)),
[9] = { 3200, 0 },
};
-#define ADXL313_ACCEL_CHANNEL(index, axis) { \
+#define ADXL313_ACCEL_CHANNEL(index, reg, axis) { \
.type = IIO_ACCEL, \
- .address = index, \
+ .scan_index = (index), \
+ .address = (reg), \
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
.info_mask_shared_by_type_available = \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_type = { \
+ .sign = 's', \
.realbits = 13, \
+ .storagebits = 16, \
+ .endianness = IIO_BE, \
}, \
}
+enum adxl313_chans {
+ chan_x, chan_y, chan_z,
+};
+
static const struct iio_chan_spec adxl313_channels[] = {
- ADXL313_ACCEL_CHANNEL(0, X),
- ADXL313_ACCEL_CHANNEL(1, Y),
- ADXL313_ACCEL_CHANNEL(2, Z),
+ ADXL313_ACCEL_CHANNEL(0, chan_x, X),
+ ADXL313_ACCEL_CHANNEL(1, chan_y, Y),
+ ADXL313_ACCEL_CHANNEL(2, chan_z, Z),
+};
+
+static const unsigned long adxl313_scan_masks[] = {
+ BIT(chan_x) | BIT(chan_y) | BIT(chan_z),
+ 0
};
static int adxl313_set_odr(struct adxl313_data *data,
}
}
+static int adxl313_set_watermark(struct iio_dev *indio_dev, unsigned int value)
+{
+ struct adxl313_data *data = iio_priv(indio_dev);
+ int ret;
+
+ value = min(value, ADXL313_FIFO_SIZE - 1);
+
+ ret = adxl313_set_measure_en(data, false);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(data->regmap, ADXL313_REG_FIFO_CTL,
+ ADXL313_REG_FIFO_CTL_MODE_MSK, value);
+ if (ret)
+ return ret;
+
+ data->watermark = value;
+
+ ret = regmap_set_bits(data->regmap, ADXL313_REG_INT_ENABLE,
+ ADXL313_INT_WATERMARK);
+ if (ret)
+ return ret;
+
+ return adxl313_set_measure_en(data, true);
+}
+
+static int adxl313_get_samples(struct adxl313_data *data)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(data->regmap, ADXL313_REG_FIFO_STATUS, ®val);
+ if (ret)
+ return ret;
+
+ return FIELD_GET(ADXL313_REG_FIFO_STATUS_ENTRIES_MSK, regval);
+}
+
+static int adxl313_fifo_transfer(struct adxl313_data *data, int samples)
+{
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < samples; i++) {
+ ret = regmap_bulk_read(data->regmap, ADXL313_REG_XYZ_BASE,
+ data->fifo_buf + (i * ADXL313_NUM_AXIS),
+ sizeof(data->fifo_buf[0]) * ADXL313_NUM_AXIS);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * adxl313_fifo_reset() - Reset the FIFO and interrupt status registers.
+ * @data: The device data.
+ *
+ * Reset the FIFO status registers. Reading out status registers clears the
+ * FIFO and interrupt configuration. Thus do not evaluate regmap return values.
+ * Ignore particular read register content. Register content is not processed
+ * any further. Therefore the function returns void.
+ */
+static void adxl313_fifo_reset(struct adxl313_data *data)
+{
+ unsigned int regval;
+ int samples;
+
+ adxl313_set_measure_en(data, false);
+
+ samples = adxl313_get_samples(data);
+ if (samples > 0)
+ adxl313_fifo_transfer(data, samples);
+
+ regmap_read(data->regmap, ADXL313_REG_INT_SOURCE, ®val);
+
+ adxl313_set_measure_en(data, true);
+}
+
+static int adxl313_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct adxl313_data *data = iio_priv(indio_dev);
+ int ret;
+
+ /* Set FIFO modes with measurement turned off, according to datasheet */
+ ret = adxl313_set_measure_en(data, false);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(data->regmap, ADXL313_REG_FIFO_CTL,
+ FIELD_PREP(ADXL313_REG_FIFO_CTL_SAMPLES_MSK, data->watermark) |
+ FIELD_PREP(ADXL313_REG_FIFO_CTL_MODE_MSK, ADXL313_FIFO_STREAM));
+ if (ret)
+ return ret;
+
+ return adxl313_set_measure_en(data, true);
+}
+
+static int adxl313_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct adxl313_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = adxl313_set_measure_en(data, false);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(data->regmap, ADXL313_REG_FIFO_CTL,
+ FIELD_PREP(ADXL313_REG_FIFO_CTL_MODE_MSK, ADXL313_FIFO_BYPASS));
+
+ ret = regmap_write(data->regmap, ADXL313_REG_INT_ENABLE, 0);
+ if (ret)
+ return ret;
+
+ return adxl313_set_measure_en(data, true);
+}
+
+static const struct iio_buffer_setup_ops adxl313_buffer_ops = {
+ .postenable = adxl313_buffer_postenable,
+ .predisable = adxl313_buffer_predisable,
+};
+
+static int adxl313_fifo_push(struct iio_dev *indio_dev, int samples)
+{
+ struct adxl313_data *data = iio_priv(indio_dev);
+ unsigned int i;
+ int ret;
+
+ ret = adxl313_fifo_transfer(data, samples);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ADXL313_NUM_AXIS * samples; i += ADXL313_NUM_AXIS)
+ iio_push_to_buffers(indio_dev, &data->fifo_buf[i]);
+
+ return 0;
+}
+
+static irqreturn_t adxl313_irq_handler(int irq, void *p)
+{
+ struct iio_dev *indio_dev = p;
+ struct adxl313_data *data = iio_priv(indio_dev);
+ int samples, int_stat;
+
+ if (regmap_read(data->regmap, ADXL313_REG_INT_SOURCE, &int_stat))
+ return IRQ_NONE;
+
+ if (FIELD_GET(ADXL313_INT_WATERMARK, int_stat)) {
+ samples = adxl313_get_samples(data);
+ if (samples < 0)
+ goto err_reset_fifo;
+
+ if (adxl313_fifo_push(indio_dev, samples))
+ goto err_reset_fifo;
+ }
+
+ if (FIELD_GET(ADXL313_INT_OVERRUN, int_stat))
+ goto err_reset_fifo;
+
+ return IRQ_HANDLED;
+
+err_reset_fifo:
+ adxl313_fifo_reset(data);
+
+ return IRQ_HANDLED;
+}
+
static int adxl313_reg_access(struct iio_dev *indio_dev, unsigned int reg,
unsigned int writeval, unsigned int *readval)
{
.read_raw = adxl313_read_raw,
.write_raw = adxl313_write_raw,
.read_avail = adxl313_read_freq_avail,
+ .hwfifo_set_watermark = adxl313_set_watermark,
.debugfs_reg_access = &adxl313_reg_access,
};
return adxl313_set_measure_en(data, true);
}
+static unsigned int adxl313_get_int_type(struct device *dev, int *irq)
+{
+ *irq = fwnode_irq_get_byname(dev_fwnode(dev), "INT1");
+ if (*irq > 0)
+ return ADXL313_INT1;
+
+ *irq = fwnode_irq_get_byname(dev_fwnode(dev), "INT2");
+ if (*irq > 0)
+ return ADXL313_INT2;
+
+ return ADXL313_INT_NONE;
+}
+
/**
* adxl313_core_probe() - probe and setup for adxl313 accelerometer
* @dev: Driver model representation of the device
{
struct adxl313_data *data;
struct iio_dev *indio_dev;
- int ret;
+ u8 int_line;
+ u8 int_map_msk;
+ int irq, ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = adxl313_channels;
indio_dev->num_channels = ARRAY_SIZE(adxl313_channels);
+ indio_dev->available_scan_masks = adxl313_scan_masks;
ret = adxl313_setup(dev, data, setup);
if (ret) {
return ret;
}
+ int_line = adxl313_get_int_type(dev, &irq);
+ if (int_line == ADXL313_INT_NONE) {
+ /*
+ * FIFO_BYPASSED mode
+ *
+ * When no interrupt lines are specified, the driver falls back
+ * to use the sensor in FIFO_BYPASS mode. This means turning off
+ * internal FIFO and interrupt generation (since there is no
+ * line specified). Unmaskable interrupts such as overrun or
+ * data ready won't interfere. Even that a FIFO_STREAM mode w/o
+ * connected interrupt line might allow for obtaining raw
+ * measurements, a fallback to disable interrupts when no
+ * interrupt lines are connected seems to be the cleaner
+ * solution.
+ */
+ ret = regmap_write(data->regmap, ADXL313_REG_FIFO_CTL,
+ FIELD_PREP(ADXL313_REG_FIFO_CTL_MODE_MSK,
+ ADXL313_FIFO_BYPASS));
+ if (ret)
+ return ret;
+ } else {
+ /* FIFO_STREAM mode */
+ int_map_msk = ADXL313_INT_DREADY | ADXL313_INT_ACTIVITY |
+ ADXL313_INT_INACTIVITY | ADXL313_INT_WATERMARK |
+ ADXL313_INT_OVERRUN;
+ ret = regmap_assign_bits(data->regmap, ADXL313_REG_INT_MAP,
+ int_map_msk, int_line == ADXL313_INT2);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_kfifo_buffer_setup(dev, indio_dev,
+ &adxl313_buffer_ops);
+ if (ret)
+ return ret;
+
+ ret = devm_request_threaded_irq(dev, irq, NULL,
+ &adxl313_irq_handler,
+ IRQF_SHARED | IRQF_ONESHOT,
+ indio_dev->name, indio_dev);
+ if (ret)
+ return ret;
+ }
+
return devm_iio_device_register(dev, indio_dev);
}
EXPORT_SYMBOL_NS_GPL(adxl313_core_probe, "IIO_ADXL313");
projects / users / willy / xarray.git / commitdiff