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authorLinus Walleij <linus.walleij@linaro.org>2016-04-14 11:45:21 +0300
committerJonathan Cameron <jic23@kernel.org>2016-04-19 21:58:13 +0300
commit0e6f6871a1591f4bb0971809c45bc91a991f1967 (patch)
tree45aa87a59f586c7aff129809ca3cc017b4d36895 /include/linux/iio
parent97865fe41322d83dac4373fe0a0de5b1a1b318c5 (diff)
downloadlinux-0e6f6871a1591f4bb0971809c45bc91a991f1967.tar.xz
iio: st_sensors: support open drain mode
Some types of ST Sensors can be connected to the same IRQ line as other peripherals using open drain. Add a device tree binding and a sensor data property to flip the right bit in the interrupt control register to enable open drain mode on the INT line. If the line is set to be open drain, also tag on IRQF_SHARED to the IRQ flags when requesting the interrupt, as the whole point of using open drain interrupt lines is to share them with more than one peripheral (wire-or). Cc: devicetree@vger.kernel.org Cc: Giuseppe Barba <giuseppe.barba@st.com> Cc: Denis Ciocca <denis.ciocca@st.com> Acked-by: Rob Herring <rob@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'include/linux/iio')
-rw-r--r--include/linux/iio/common/st_sensors.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h
index d8da075bfda0..d029ffac0d69 100644
--- a/include/linux/iio/common/st_sensors.h
+++ b/include/linux/iio/common/st_sensors.h
@@ -122,6 +122,8 @@ struct st_sensor_bdu {
* @mask_int2: mask to enable/disable IRQ on INT2 pin.
* @addr_ihl: address to enable/disable active low on the INT lines.
* @mask_ihl: mask to enable/disable active low on the INT lines.
+ * @addr_od: address to enable/disable Open Drain on the INT lines.
+ * @mask_od: mask to enable/disable Open Drain on the INT lines.
* @addr_stat_drdy: address to read status of DRDY (data ready) interrupt
* struct ig1 - represents the Interrupt Generator 1 of sensors.
* @en_addr: address of the enable ig1 register.
@@ -133,6 +135,8 @@ struct st_sensor_data_ready_irq {
u8 mask_int2;
u8 addr_ihl;
u8 mask_ihl;
+ u8 addr_od;
+ u8 mask_od;
u8 addr_stat_drdy;
struct {
u8 en_addr;
@@ -215,6 +219,7 @@ struct st_sensor_settings {
* @odr: Output data rate of the sensor [Hz].
* num_data_channels: Number of data channels used in buffer.
* @drdy_int_pin: Redirect DRDY on pin 1 (1) or pin 2 (2).
+ * @int_pin_open_drain: Set the interrupt/DRDY to open drain.
* @get_irq_data_ready: Function to get the IRQ used for data ready signal.
* @tf: Transfer function structure used by I/O operations.
* @tb: Transfer buffers and mutex used by I/O operations.
@@ -236,6 +241,7 @@ struct st_sensor_data {
unsigned int num_data_channels;
u8 drdy_int_pin;
+ bool int_pin_open_drain;
unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);