> Signed-off-by: Tiberiu Breana <tiberiu.a.breana@xxxxxxxxx>
comments below
> ---
> drivers/iio/accel/bma220_spi.c | 67 ++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 65 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/accel/bma220_spi.c b/drivers/iio/accel/bma220_spi.c
> index 440e045..d3c8bd6 100644
> --- a/drivers/iio/accel/bma220_spi.c
> +++ b/drivers/iio/accel/bma220_spi.c
> @@ -11,9 +11,12 @@
> #include <linux/acpi.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> +#include <linux/iio/buffer.h>
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
> #include <linux/spi/spi.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
>
> #define BMA220_REG_ID 0x00
> #define BMA220_REG_ACCEL_X 0x02
> @@ -37,6 +40,14 @@
> .channel2 = IIO_MOD_##axis, \
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> + .scan_index = index, \
> + .scan_type = { \
> + .sign = 's', \
> + .realbits = 6, \
> + .storagebits = 8, \
> + .shift = BMA220_DATA_SHIFT, \
> + .endianness = IIO_CPU, \
> + }, \
> }
>
> static IIO_CONST_ATTR(in_accel_scale_available, BMA220_SCALE_AVAILABLE);
> @@ -57,12 +68,15 @@ static const int bma220_scale_table[][4] = {
> struct bma220_data {
> struct spi_device *spi_device;
> u8 range;
> + struct mutex lock;
> + s8 buffer[16]; /* 2x8-bit channels + 6x8 padding + 8x8 timestamp */
3x8-bit channels? x,y,z?
> };
>
> static const struct iio_chan_spec bma220_channels[] = {
> BMA220_ACCEL_CHANNEL(0, BMA220_REG_ACCEL_X, X),
> BMA220_ACCEL_CHANNEL(1, BMA220_REG_ACCEL_Y, Y),
> BMA220_ACCEL_CHANNEL(2, BMA220_REG_ACCEL_Z, Z),
> + IIO_CHAN_SOFT_TIMESTAMP(3),
> };
>
> static inline int bma220_read_reg(struct spi_device *spi, u8 reg)
> @@ -70,6 +84,42 @@ static inline int bma220_read_reg(struct spi_device *spi, u8 reg)
> return spi_w8r8(spi, reg | BMA220_READ_MASK);
> }
>
> +static irqreturn_t bma220_trigger_handler(int irq, void *p)
> +{
> + int i;
> + int ret;
> + int bit;
> + struct iio_poll_func *pf = p;
> + struct iio_dev *indio_dev = pf->indio_dev;
> + struct bma220_data *data = iio_priv(indio_dev);
> + struct spi_device *spi = data->spi_device;
> + u8 tx_buf = BMA220_REG_ACCEL_X | BMA220_READ_MASK;
> + u8 rx_buf[3];
alignment requirements for SPI?
> +
> + /* Do a bulk read, then pick out what we need. */
> + mutex_lock(&data->lock);
> + ret = spi_write_then_read(spi, &tx_buf, sizeof(tx_buf),
> + rx_buf, sizeof(rx_buf));
> + if (ret < 0) {
> + mutex_unlock(&data->lock);
> + goto err;
> + }
> +
> + i = 0;
> + for_each_set_bit(bit, indio_dev->active_scan_mask,
> + indio_dev->masklength) {
> + data->buffer[i] = rx_buf[i];
this doesn't work the index of rx_buf must depend on bit
> + i++;
> + }
> + mutex_unlock(&data->lock);
> +
> + iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
> + pf->timestamp);
what does the mutex actually protect?
buffer is used outside the mutex here
> +err:
> + iio_trigger_notify_done(indio_dev->trig);
> + return IRQ_HANDLED;
> +}
> +
> static int bma220_read_raw(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan,
> int *val, int *val2, long mask)
> @@ -155,6 +205,7 @@ static int bma220_probe(struct spi_device *spi)
> data = iio_priv(indio_dev);
> data->spi_device = spi;
> spi_set_drvdata(spi, indio_dev);
> + mutex_init(&data->lock);
>
> indio_dev->dev.parent = &spi->dev;
> indio_dev->info = &bma220_info;
> @@ -167,11 +218,22 @@ static int bma220_probe(struct spi_device *spi)
> if (ret != BMA220_CHIP_ID)
> return -ENODEV;
>
> + ret = iio_triggered_buffer_setup(indio_dev, NULL,
> + bma220_trigger_handler, NULL);
> + if (ret < 0) {
> + dev_err(&data->spi_device->dev,
> + "iio triggered buffer setup failed\n");
> + return ret;
> + }
> +
> ret = iio_device_register(indio_dev);
> - if (ret < 0)
> + if (ret < 0) {
> dev_err(&spi->dev, "iio_device_register failed\n");
> + iio_triggered_buffer_cleanup(indio_dev);
> + return ret;
> + }
>
> - return ret;
> + return 0;
> }
>
> static int bma220_remove(struct spi_device *spi)
> @@ -180,6 +242,7 @@ static int bma220_remove(struct spi_device *spi)
> struct bma220_data *data = iio_priv(indio_dev);
>
> iio_device_unregister(indio_dev);
> + iio_triggered_buffer_cleanup(indio_dev);
>
> return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
> }
>
--
Peter Meerwald-Stadler
+43-664-2444418 (mobile)
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