Merge tag 'iio-for-4.9b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

Second set of iio new device support, features and cleanups for the 4.9 cycle.

New device support
* ad8801 dac
  - new driver supporting ad8801 and ad8803 DACs.
* adc12138
  - new driver supporting TI adc12130/adc12132 and adc12138 ADCs.
* ltc2485 adc
  - new driver
* mxc6255
  - add support for the mxc6225 part name and fixup the ID check so it works.
* vz89x VOC sensor
  - add support for the vz89te part which drops the voc_short channel and adds
    CRCs compared to other supported parts.

New features
* core
  - immutable triggers.  These effectively grant exclusive control over a
    trigger. The typical usecase is a device representing an analog part
    (perhaps a MUX) that needs to control the sampling of a downstream
    ADC.
  - resource managed trigger registration and triggered_buffer_init.
  - iio_push_event now protected against case of the event interface
    registration not having yet occured.  Only matters if an interrupt
    can occur during this window - might happen on shared interrupt lines.
  - helper to let a driver query if the trigger it is using is provided by
    itself (using the convention of both device and trigger having the same
    parent).
* tools
  - iio-utils. Used channel modifier scaling in preference to generic scaling
    when both exist.
* at91-adc
  - Add support for touchscreen switches closure time needed by some newer
    parts.
* stx104
  - support the ADC channels on this ADC/DAC board. As these are the primary
    feature of the board also move the driver to the iio/adc directory.
* sx9500
  - device tree bindings.

Cleanups / Fixes
* ad5755
  - fix an off-by-one on devnr limit check (introduced earlier this cycle)
* ad7266
  - drop NULL check on devm_regulator_get_optional as it can't return NULL.
* ak8974
  - avoid an unused functional warning due to rework in PM core code.
  - remove .owner field setting as done by i2c_core.
* ina2xx
  - clear out a left over debug field from chip global data.
* hid-sensors
  - avoid an unused functional warning due to rework in PM core code.
* maxim-thermocouple
  - fix non static symbol warnings.
* ms5611
  - fetch and enable regulators unconditionally when they aren't optional.
* sca3000
  - whitespace cleanup.
* st_sensors
  - fetch and enable regulators unconditionally rather than having them
    supported as optional regulators (missunderstanding on my part amongst
    others a while back)
  - followup to previous patch fixes error checking on the regulators.
  - mark symbols static where possible.
  - use the 'is it my trigger' help function.  This prevents the odd case
    of another device triggering from the st-sensors trigger whilst the
    st-sensors trigger is itself not using it but rather using say an hrtimer.
* ti-ads1015
  - add missing of_node_put.
* vz89x
  - rework to all support of new devices.
  - prevent reading of a corrupted buffer.
  - fixup a return value of 0/1 in a bool returning function.

Address updates
- Vlad Dogaru email address change.

3 files changed, 37 insertions, 0 deletions

diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 854e2dad1e0d..b4a0679e4a49 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -483,6 +483,7 @@ struct iio_buffer_setup_ops {
  * @scan_timestamp:	[INTERN] set if any buffers have requested timestamp
  * @scan_index_timestamp:[INTERN] cache of the index to the timestamp
  * @trig:		[INTERN] current device trigger (buffer modes)
+ * @trig_readonly	[INTERN] mark the current trigger immutable
  * @pollfunc:		[DRIVER] function run on trigger being received
  * @pollfunc_event:	[DRIVER] function run on events trigger being received
  * @channels:		[DRIVER] channel specification structure table
@@ -523,6 +524,7 @@ struct iio_dev {
 	bool				scan_timestamp;
 	unsigned			scan_index_timestamp;
 	struct iio_trigger		*trig;
+	bool				trig_readonly;
 	struct iio_poll_func		*pollfunc;
 	struct iio_poll_func		*pollfunc_event;
 
@@ -642,6 +644,7 @@ static inline struct iio_dev *iio_priv_to_dev(void *priv)
 }
 
 void iio_device_free(struct iio_dev *indio_dev);
+int devm_iio_device_match(struct device *dev, void *res, void *data);
 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv);
 void devm_iio_device_free(struct device *dev, struct iio_dev *indio_dev);
 struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
index 1c9e028e0d4a..4f1154f7a33c 100644
--- a/include/linux/iio/trigger.h
+++ b/include/linux/iio/trigger.h
@@ -56,6 +56,9 @@ struct iio_trigger_ops {
  * @subirqs:		[INTERN] information about the 'child' irqs.
  * @pool:		[INTERN] bitmap of irqs currently in use.
  * @pool_lock:		[INTERN] protection of the irq pool.
+ * @attached_own_device:[INTERN] if we are using our own device as trigger,
+ *			i.e. if we registered a poll function to the same
+ *			device as the one providing the trigger.
  **/
 struct iio_trigger {
 	const struct iio_trigger_ops	*ops;
@@ -73,6 +76,7 @@ struct iio_trigger {
 	struct iio_subirq subirqs[CONFIG_IIO_CONSUMERS_PER_TRIGGER];
 	unsigned long pool[BITS_TO_LONGS(CONFIG_IIO_CONSUMERS_PER_TRIGGER)];
 	struct mutex			pool_lock;
+	bool				attached_own_device;
 };
 
 
@@ -125,12 +129,27 @@ static inline void *iio_trigger_get_drvdata(struct iio_trigger *trig)
  **/
 int iio_trigger_register(struct iio_trigger *trig_info);
 
+int devm_iio_trigger_register(struct device *dev,
+			      struct iio_trigger *trig_info);
+
 /**
  * iio_trigger_unregister() - unregister a trigger from the core
  * @trig_info:	trigger to be unregistered
  **/
 void iio_trigger_unregister(struct iio_trigger *trig_info);
 
+void devm_iio_trigger_unregister(struct device *dev,
+				 struct iio_trigger *trig_info);
+
+/**
+ * iio_trigger_set_immutable() - set an immutable trigger on destination
+ *
+ * @indio_dev - IIO device structure containing the device
+ * @trig - trigger to assign to device
+ *
+ **/
+int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig);
+
 /**
  * iio_trigger_poll() - called on a trigger occurring
  * @trig:	trigger which occurred
@@ -145,6 +164,13 @@ irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
 __printf(1, 2) struct iio_trigger *iio_trigger_alloc(const char *fmt, ...);
 void iio_trigger_free(struct iio_trigger *trig);
 
+/**
+ * iio_trigger_using_own() - tells us if we use our own HW trigger ourselves
+ * @indio_dev:  device to check
+ */
+bool iio_trigger_using_own(struct iio_dev *indio_dev);
+
+
 #else
 struct iio_trigger;
 struct iio_trigger_ops;
diff --git a/include/linux/iio/triggered_buffer.h b/include/linux/iio/triggered_buffer.h
index f72f70d5a97b..30145616773d 100644
--- a/include/linux/iio/triggered_buffer.h
+++ b/include/linux/iio/triggered_buffer.h
@@ -12,4 +12,12 @@ int iio_triggered_buffer_setup(struct iio_dev *indio_dev,
 	const struct iio_buffer_setup_ops *setup_ops);
 void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev);
 
+int devm_iio_triggered_buffer_setup(struct device *dev,
+				    struct iio_dev *indio_dev,
+				    irqreturn_t (*h)(int irq, void *p),
+				    irqreturn_t (*thread)(int irq, void *p),
+				    const struct iio_buffer_setup_ops *ops);
+void devm_iio_triggered_buffer_cleanup(struct device *dev,
+				       struct iio_dev *indio_dev);
+
 #endif