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Date: Wed, 19 Aug 2015 15:09:56 +0300
From: Teodora Baluta <teodora.baluta@...el.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
daniel.baluta@...el.com, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] iio: mxc4005: add triggered buffer mode for
mxc4005
On Sun, Aug 16, 2015 at 08:37:52AM +0100, Jonathan Cameron wrote:
> On 13/08/15 18:31, Teodora Baluta wrote:
> > This patch adds support for buffered readings for the 3-axis
> > accelerometer mxc4005.
> >
> > Signed-off-by: Teodora Baluta <teodora.baluta@...el.com>
> One big one (buffer isn't big enough) in here.
> Otherwise, looking good.
Yes, thanks. :)
>
> Jonathan
> > ---
> > drivers/iio/accel/Kconfig | 2 ++
> > drivers/iio/accel/mxc4005.c | 75 +++++++++++++++++++++++++++++++++++++++++++--
> > 2 files changed, 75 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> > index 69302be..cd5cd24 100644
> > --- a/drivers/iio/accel/Kconfig
> > +++ b/drivers/iio/accel/Kconfig
> > @@ -140,6 +140,8 @@ config MMA9553
> > config MXC4005
> > tristate "Memsic MXC4005XC 3-Axis Accelerometer Driver"
> > depends on I2C
> > + select IIO_BUFFER
> > + select IIO_TRIGGERED_BUFFER
> > select REGMAP_I2C
> > help
> > Say yes here to build support for the Memsic MXC4005XC 3-axis
> > diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c
> > index 76a7954..5f4813d 100644
> > --- a/drivers/iio/accel/mxc4005.c
> > +++ b/drivers/iio/accel/mxc4005.c
> > @@ -19,6 +19,9 @@
> > #include <linux/acpi.h>
> > #include <linux/regmap.h>
> > #include <linux/iio/sysfs.h>
> > +#include <linux/iio/buffer.h>
> > +#include <linux/iio/triggered_buffer.h>
> > +#include <linux/iio/trigger_consumer.h>
> >
> > #define MXC4005_DRV_NAME "mxc4005"
> > #define MXC4005_REGMAP_NAME "mxc4005_regmap"
> > @@ -52,6 +55,7 @@ struct mxc4005_data {
> > struct i2c_client *client;
> > struct mutex mutex;
> > struct regmap *regmap;
> > + __be16 buffer[3];
> Not big enough as needs to have space for the timestamp as well.
> (noticing this does require reading the fine print for
> iio_push_to_buffers_with_timestamp).
>
> Should be 3*2 bytes + 8 bytes (aligned) so will be 16 bytes, or 8 __be16s.
>
> > };
> >
> > /*
> > @@ -123,6 +127,20 @@ static const struct regmap_config mxc4005_regmap_config = {
> > .writeable_reg = mxc4005_is_writeable_reg,
> > };
> >
> > +static int mxc4005_read_xyz(struct mxc4005_data *data)
> > +{
> > + int ret;
> > +
> > + ret = regmap_bulk_read(data->regmap, MXC4005_REG_XOUT_UPPER,
> > + (u8 *) data->buffer, sizeof(data->buffer));
> > + if (ret < 0) {
> > + dev_err(&data->client->dev, "failed to read axes\n");
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > static int mxc4005_read_axis(struct mxc4005_data *data,
> > unsigned int addr)
> > {
> > @@ -198,7 +216,8 @@ static int mxc4005_read_raw(struct iio_dev *indio_dev,
> > ret = mxc4005_read_axis(data, chan->address);
> > if (ret < 0)
> > return ret;
> > - *val = sign_extend32(ret >> 4, 11);
> > + *val = sign_extend32(ret >> chan->scan_type.shift,
> > + chan->scan_type.realbits - 1);
> > return IIO_VAL_INT;
> > default:
> > return -EINVAL;
> > @@ -240,6 +259,11 @@ static const struct iio_info mxc4005_info = {
> > .attrs = &mxc4005_attrs_group,
> > };
> >
> > +static const unsigned long mxc4005_scan_masks[] = {
> > + BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
> > + 0
> > +};
> > +
> > #define MXC4005_CHANNEL(_axis, _addr) { \
> > .type = IIO_ACCEL, \
> > .modified = 1, \
> > @@ -247,14 +271,43 @@ static const struct iio_info mxc4005_info = {
> > .address = _addr, \
> > .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> > .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> > + .scan_index = AXIS_##_axis, \
> > + .scan_type = { \
> > + .sign = 's', \
> > + .realbits = 12, \
> > + .storagebits = 16, \
> > + .shift = 4, \
> > + .endianness = IIO_BE, \
> > + }, \
> > }
> >
> > static const struct iio_chan_spec mxc4005_channels[] = {
> > MXC4005_CHANNEL(X, MXC4005_REG_XOUT_UPPER),
> > MXC4005_CHANNEL(Y, MXC4005_REG_YOUT_UPPER),
> > MXC4005_CHANNEL(Z, MXC4005_REG_ZOUT_UPPER),
> > + IIO_CHAN_SOFT_TIMESTAMP(3),
> > };
> >
> > +static irqreturn_t mxc4005_trigger_handler(int irq, void *private)
> > +{
> > + struct iio_poll_func *pf = private;
> > + struct iio_dev *indio_dev = pf->indio_dev;
> > + struct mxc4005_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + ret = mxc4005_read_xyz(data);
> > + if (ret < 0)
> > + goto err;
> > +
> > + iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
> > + iio_get_time_ns());
> > +
> > +err:
> > + iio_trigger_notify_done(indio_dev->trig);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > static int mxc4005_chip_init(struct mxc4005_data *data)
> > {
> > int ret;
> > @@ -305,18 +358,34 @@ static int mxc4005_probe(struct i2c_client *client,
> > indio_dev->dev.parent = &client->dev;
> > indio_dev->channels = mxc4005_channels;
> > indio_dev->num_channels = ARRAY_SIZE(mxc4005_channels);
> > + indio_dev->available_scan_masks = mxc4005_scan_masks;
> > indio_dev->name = MXC4005_DRV_NAME;
> > indio_dev->modes = INDIO_DIRECT_MODE;
> > indio_dev->info = &mxc4005_info;
> >
> > + ret = iio_triggered_buffer_setup(indio_dev,
> > + &iio_pollfunc_store_time,
> > + mxc4005_trigger_handler,
> > + NULL);
> > + if (ret < 0) {
> > + dev_err(&client->dev,
> > + "failed to setup iio triggered buffer\n");
> > + return ret;
> > + }
> > +
> > ret = iio_device_register(indio_dev);
> > if (ret < 0) {
> > dev_err(&client->dev,
> > "unable to register iio device %d\n", ret);
> > - return ret;
> > + goto err_buffer_cleanup;
> > }
> >
> > return 0;
> > +
> > +err_buffer_cleanup:
> > + iio_triggered_buffer_cleanup(indio_dev);
> > +
> > + return ret;
> > }
> >
> > static int mxc4005_remove(struct i2c_client *client)
> > @@ -325,6 +394,8 @@ static int mxc4005_remove(struct i2c_client *client)
> >
> > iio_device_unregister(indio_dev);
> >
> > + iio_triggered_buffer_cleanup(indio_dev);
> > +
> > return 0;
> > }
> >
> >
>
> --
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