Re: [PATCH 3/9] iio: mma8452: add freefall / motion interrupt source

[Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On 05/07/15 12:44, Jonathan Cameron wrote:
> On 04/07/15 14:55, Martin Kepplinger wrote:
>> This adds the freefall / motion interrupt source definitions to the driver.
>> It is not in use now, but mma_chip_info and iio_chan_spec can easily be
>> adapted to use it instead of the transient interrupt source.
> So some support is added, but nothing done with it?  Not sure we want
> to do this as it adds unused code paths.
> 
> Why not support this fully?
Ah, I get it now. Used in next patch.  Please add a comment here to indicate
that!
>>
>> Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
>> Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
>> ---
>>  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 209b0d7..0498b6e 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
>> @@ -564,7 +574,8 @@ 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);
>>  }
>> @@ -605,6 +616,7 @@ 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;
>>  
>> @@ -617,7 +629,10 @@ 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;
>>  	}
>> @@ -678,6 +693,16 @@ static const struct iio_event_spec mma8452_transient_event[] = {
>>  	},
>>  };
>>  
>> +static const struct iio_event_spec mma8452_motion_event[] = {
>> +	{
>> +		.type = IIO_EV_TYPE_THRESH,
>> +		.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.
>> @@ -962,13 +987,15 @@ 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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