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Date: Sun, 19 Jul 2015 14:45:07 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Martin Kepplinger <martink@...teo.de>, knaack.h@....de,
lars@...afoo.de, pmeerw@...erw.net, mfuzzey@...keon.com,
roberta.dobrescu@...il.com, robh+dt@...nel.org, pawel.moll@....com,
mark.rutland@....com, ijc+devicetree@...lion.org.uk,
galak@...eaurora.org
CC: devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org,
christoph.muellner@...obroma-systems.com,
Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
Subject: Re: [PATCH 3/8] iio: mma8452: add freefall / motion interrupt source
On 06/07/15 13:34, Martin Kepplinger wrote:
> This adds the freefall / motion interrupt source definitions to the driver.
> It is used in this series' next patch, for chips that don't support the
> transient interrupt source.
>
> The iio event type is IIO_EV_TYPE_MAG since the threshold for comparison
> is no signed value. An interrupt occurs on positive and negative values
> when the magnitude crosses the threshold value.
>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
> Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
Again, looks fine to me.
> ---
> drivers/iio/accel/mma8452.c | 45 ++++++++++++++++++++++++++++++++++++---------
> 1 file changed, 36 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
> index 71b40f7..1337707 100644
> --- a/drivers/iio/accel/mma8452.c
> +++ b/drivers/iio/accel/mma8452.c
> @@ -38,9 +38,18 @@
> #define MMA8452_DATA_CFG 0x0e
> #define MMA8452_HP_FILTER_CUTOFF 0x0f
> #define MMA8452_HP_FILTER_CUTOFF_SEL_MASK (BIT(0) | BIT(1))
> +#define MMA8452_FF_MT_CFG 0x15
> +#define MMA8452_FF_MT_CFG_OAE BIT(6)
> +#define MMA8452_FF_MT_CFG_ELE BIT(7)
> +#define MMA8452_FF_MT_SRC 0x16
> +#define MMA8452_FF_MT_SRC_XHE BIT(1)
> +#define MMA8452_FF_MT_SRC_YHE BIT(3)
> +#define MMA8452_FF_MT_SRC_ZHE BIT(5)
> +#define MMA8452_FF_MT_THS 0x17
> +#define MMA8452_FF_MT_THS_MASK 0x7f
> +#define MMA8452_FF_MT_COUNT 0x18
> #define MMA8452_TRANSIENT_CFG 0x1d
> #define MMA8452_TRANSIENT_CFG_ELE BIT(4)
> -#define MMA8452_TRANSIENT_CFG_CHAN(chan) BIT(chan + 1)
> #define MMA8452_TRANSIENT_CFG_HPF_BYP BIT(0)
> #define MMA8452_TRANSIENT_SRC 0x1e
> #define MMA8452_TRANSIENT_SRC_XTRANSE BIT(1)
> @@ -74,6 +83,7 @@
> #define MMA8452_DATA_CFG_HPF_MASK BIT(4)
>
> #define MMA8452_INT_DRDY BIT(0)
> +#define MMA8452_INT_FF_MT BIT(2)
> #define MMA8452_INT_TRANS BIT(5)
>
> #define MMA8452_DEVICE_ID 0x2a
> @@ -591,7 +601,8 @@ static int mma8452_write_event_config(struct iio_dev *indio_dev,
> else
> val &= ~BIT(chan->scan_index + chip->ev_cfg_chan_shift);
>
> - val |= MMA8452_TRANSIENT_CFG_ELE;
> + val |= chip->ev_cfg_ele;
> + val |= MMA8452_FF_MT_CFG_OAE;
>
> return mma8452_change_config(data, chip->ev_cfg, val);
> }
> @@ -632,6 +643,7 @@ static irqreturn_t mma8452_interrupt(int irq, void *p)
> {
> struct iio_dev *indio_dev = p;
> struct mma8452_data *data = iio_priv(indio_dev);
> + const struct mma_chip_info *chip = data->chip_info;
> int ret = IRQ_NONE;
> int src;
>
> @@ -644,7 +656,10 @@ static irqreturn_t mma8452_interrupt(int irq, void *p)
> ret = IRQ_HANDLED;
> }
>
> - if (src & MMA8452_INT_TRANS) {
> + if ((src & MMA8452_INT_TRANS &&
> + chip->ev_src == MMA8452_TRANSIENT_SRC) ||
> + (src & MMA8452_INT_FF_MT &&
> + chip->ev_src == MMA8452_FF_MT_SRC)) {
> mma8452_transient_interrupt(indio_dev);
> ret = IRQ_HANDLED;
> }
> @@ -705,6 +720,16 @@ static const struct iio_event_spec mma8452_transient_event[] = {
> },
> };
>
> +static const struct iio_event_spec mma8452_motion_event[] = {
> + {
> + .type = IIO_EV_TYPE_MAG,
> + .dir = IIO_EV_DIR_RISING,
> + .mask_separate = BIT(IIO_EV_INFO_ENABLE),
> + .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
> + BIT(IIO_EV_INFO_PERIOD)
> + },
> +};
> +
> /*
> * Threshold is configured in fixed 8G/127 steps regardless of
> * currently selected scale for measurement.
> @@ -988,13 +1013,15 @@ static int mma8452_probe(struct i2c_client *client,
>
> if (client->irq) {
> /*
> - * Although we enable the transient interrupt source once and
> - * for all here the transient event detection itself is not
> - * enabled until userspace asks for it by
> - * mma8452_write_event_config()
> + * Although we enable the interrupt sources once and for
> + * all here the event detection itself is not enabled until
> + * userspace asks for it by mma8452_write_event_config()
> */
> - int supported_interrupts = MMA8452_INT_DRDY | MMA8452_INT_TRANS;
> - int enabled_interrupts = MMA8452_INT_TRANS;
> + int supported_interrupts = MMA8452_INT_DRDY |
> + MMA8452_INT_TRANS |
> + MMA8452_INT_FF_MT;
> + int enabled_interrupts = MMA8452_INT_TRANS |
> + MMA8452_INT_FF_MT;
>
> /* Assume wired to INT1 pin */
> ret = i2c_smbus_write_byte_data(client,
>
--
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