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| author |   Linus Walleij <linus.walleij@linaro.org> | 2015-11-19 10:15:17 +0100 |
|---|---|---|
| committer |   Jonathan Cameron <jic23@kernel.org> | 2016-01-10 12:35:32 +0000 |
| commit | a9fd053b56c6bb14972ab7a19da0b575fe4c5d66 (patch) | |
| tree | 625a014d7de7fd5ad114f8c045e8f2821f99679a /drivers/iio/gyro | |
| parent | Staging: iio: cdc: ad7150: Fix alignment should match open parenthesis (diff) | |
| download | linux-dev-a9fd053b56c6bb14972ab7a19da0b575fe4c5d66.tar.xz linux-dev-a9fd053b56c6bb14972ab7a19da0b575fe4c5d66.zip | |
iio: st_sensors: support active-low interrupts
Most ST MEMS Sensors that support interrupts can also handle sending
an active low interrupt, i.e. going from high to low on data ready
(or other interrupt) and thus triggering on a falling edge to the
interrupt controller.
Set up logic to inspect the interrupt line we get for a sensor: if
it is triggering on rising edge, leave everything alone, but if it
triggers on falling edges, set up active low, and if unsupported
configurations appear: warn with errors and reconfigure the interrupt
to a rising edge, which all interrupt generating sensors support.
Create a local header for st_sensors_core.h to share functions
between the sensor core and the trigger setup code.
Cc: Giuseppe Barba <giuseppe.barba@st.com>
Cc: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/gyro')
| -rw-r--r-- | drivers/iio/gyro/st_gyro_core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/iio/gyro/st_gyro_core.c b/drivers/iio/gyro/st_gyro_core.c index 02eddcebeea3..110f95b6e52f 100644 --- a/drivers/iio/gyro/st_gyro_core.c +++ b/drivers/iio/gyro/st_gyro_core.c @@ -185,6 +185,11 @@ static const struct st_sensor_settings st_gyro_sensors_settings[] = { .drdy_irq = { .addr = ST_GYRO_1_DRDY_IRQ_ADDR, .mask_int2 = ST_GYRO_1_DRDY_IRQ_INT2_MASK, + /* + * The sensor has IHL (active low) and open + * drain settings, but only for INT1 and not + * for the DRDY line on INT2. + */ }, .multi_read_bit = ST_GYRO_1_MULTIREAD_BIT, .bootime = 2, @@ -248,6 +253,11 @@ static const struct st_sensor_settings st_gyro_sensors_settings[] = { .drdy_irq = { .addr = ST_GYRO_2_DRDY_IRQ_ADDR, .mask_int2 = ST_GYRO_2_DRDY_IRQ_INT2_MASK, + /* + * The sensor has IHL (active low) and open + * drain settings, but only for INT1 and not + * for the DRDY line on INT2. + */ }, .multi_read_bit = ST_GYRO_2_MULTIREAD_BIT, .bootime = 2, @@ -307,6 +317,11 @@ static const struct st_sensor_settings st_gyro_sensors_settings[] = { .drdy_irq = { .addr = ST_GYRO_3_DRDY_IRQ_ADDR, .mask_int2 = ST_GYRO_3_DRDY_IRQ_INT2_MASK, + /* + * The sensor has IHL (active low) and open + * drain settings, but only for INT1 and not + * for the DRDY line on INT2. + */ }, .multi_read_bit = ST_GYRO_3_MULTIREAD_BIT, .bootime = 2, |