Merge tag 'iio-for-5.16a-split-take4' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next

Jonathan writes:

First set of IIO new device and feature support for the 5.16 cycle

Counter subsystem changes now sent separately.

This has been a busy cycle, so lots here and a few more stragglers to
come next week.

Big new feature in this cycle is probably output buffer support.
This has been in the works for a very long time so it's great to see
Mihail pick up the challenge and build upon his predecessors work to finally
bring this feature to mainline.

New device support
------------------

* adi,adxl313
  - New driver and dt bindings for this low power accelerometer.
* adi,adxl355
  - New driver and dt bindings for this accelerometer.
  - Later series adds buffer support.
* asahi-kasei,ak8975
  - Minor additions to driver to support ak09916
* aspeed,aspeed-adc
  - Substantial rework plus feature additions to add support for the
    ast2600 including a new dt bindings doc.
* atmel,at91_sama5d2
  - Rework and support introduced for the sama7g5 parts.
* maxim,max31865
  - New driver and bindings for this RTD temperature sensor chip.
* nxp,imx8qxp
  - New driver and bindings for the ADC found on the i.MX 8QuadXPlus Soc.
* senseair,sunrise
  - New driver and bindings for this family of carbon dioxide gas sensors.
* sensiron,scd4x
  - New driver and bindings for this carbon dioxide gas sensor.

New features
------------

* Output buffer support.  Works in a similar fashion to input buffers, but
  in this case userspace pushes data into the kfifo which is then drained
  to the device when a trigger occurs.  Support added to the ad5766 DAC
  driver.
* Core, devm_iio_map_array_register() to avoid need for
  devm_add_action_or_reset() based cleanup in fully managed allocation
  drivers.
* Core iio_push_to_buffers_with_ts_unaligned() function to safely handle a
  few drivers where it really hard to ensure the correct data alignment in
  an iio_push_to_buffers_with_timestamp() call. Note this uses a bounce
  buffer so should be avoided whenever possible.  Used in the ti,adc108s102,
  invense,mpu3050 and adi,adis16400.  This closes the last   known set
  of drivers with alignment issues at this interface.
* maxim,max1027
  - Substantial rework to this driver main target of which was supporting
    use of other triggers than it's own EOC interrupt.
  - Transfer optimization.
* nxp,fxls8962af
  - Threshold even support including using it as a wakeup source.

Cleanups, minor fixes etc
-------------------------

Chances of a common type to multiple drivers:

* devm_ conversion and drop of .remove() callbacks in:
  - adi,ad5064
  - adi,ad7291
  - adi,ad7303
  - adi,ad7746
  - adi,ad9832
  - adi,adis16080
  - dialog,da9150-gpadc
  - intel,mrfld_adc
  - marvell,berlin2
  - maxim,max1363
  - maxim,max44000
  - nuvoton,nau7802
  - st_sensors (includes a lot of rework!)
  - ti,ads8344
  - ti,lp8788

* devm_platform_ioremap_resource() used to reduce boilerplate
  - cirrus,ep93xx
  - rockchip,saradc
  - stm,stm32-dac

* Use dev_err_probe() in more places to both not print on deferred probe and
  ensure a reason for the deferral is available for debug purposes.
  - adi,ad8801
  - capella,cm36651
  - linear,ltc1660
  - maxim,ds4424
  - maxim,max5821
  - microchip,mcp4922
  - nxp,lpc18xx
  - onnn,noa1305
  - st,lsm9ds0
  - st,st_sensors
  - st,stm32-dac
  - ti,afe4403
  - ti,afe4404
  - ti,dac7311

* Drop error returns in SPI and I2C remove() functions as they are ignored and
  long term plan is to change these all over to returning void. In some cases
  these patches just make it 'obvious' they always return 0 where it was the
  case before but not easy to tell.
  - adi,ad5380
  - adi,ad5446
  - adi,ad5686
  - adi,ad5592r
  - bosch,bma400
  - bosch,bmc150
  - fsl,mma7455
  - honeywell,hmc5843
  - kionix,kxsd9
  - maxim,max5487
  - meas,ms5611
  - ti,afe4403

Driver specific changes

* adi,ad5770r
  - Bring driver inline with documented bindings.
* adi,ad7746
  - Trivial style fix
* adi,ad7949
  - Express some magic values as the underlying parts via new #defines.
  - Make it work with SPI controllers that don't support 14 or 16 bit messages
  - Support selection of voltage reference from dt including expanding the
    dt-bindings to cover this new functionality.
* adi,ad799x
  - Implement selection of external reference voltage on AD7991, AD7995 and
    AD7999.
  - Add missing dt-bindings doc for devices supported by this driver.
* adi,adislib
  - Move interrupt startup to better location in startup flow.
  - Handle devices that cannot mask/unmask the drdy pin and must instead mask
    at the interrupt controller.  Applies to the adis16460 and adis16475 from
    which we then drop equivalent code.
* adi,ltc2983
  - Add support for optional reset pin.
  - Fail to probe if no channels specified in dt binding.
* asahi-kasei,ak8975
  - dt-binding additions of missing vid-supply regulator.
* aspeed,aspeed-adc
  - Typo fix.
* fsl,mma7660
  - Mark acpi_device_id table __maybe_unused to avoid build warning.
* fsl,imx25-gcq
  - Avoid initializing regulators that aren't used.
* invensense,mpu3050
  - Drop a dead protection against a clash with the old input driver.
* invensense,mpu6050
  - Rework code to not use strcpy() and hence avoid possibility of wrong sized
    buffers. Note this wasn't a bug, but the new code is a lot more readable.
  - Mark acpi_device_id table __maybe_unused to avoid build warning.
* kionix,kxcjk1013
  - dt-binding addition to note it supports interrupts.
* marvell,berlin2-adc
  - Enable COMPILE_TEST building.
* maxim,max1027
  - Avoid returning success in an error path.
* nxp,imx8qxp
  - Fix warning when runtime pm not enabled via __maybe_unused.
* ricoh,rn5t618
  - Use the new devm_iio_map_array_register() instead of open coding the same.
* samsung,exynos_adc
  - Improve kconfig help text.
* st,lsm6dsx
  - Move max_fifo_size into the fifo_ops structure where the other configuration
    parameters are found.
* st,st_sensors:
  - Reorder to ensure we turn the power off after removing userspace interfaces.
* senseair,sunrise
  - Add missing I2C dependency.
* ti,twl6030
  - Small code tidy up.

* tag 'iio-for-5.16a-split-take4' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (148 commits)
  iio: imx8qxp-adc: mark PM functions as __maybe_unused
  iio: pressure: ms5611: Make ms5611_remove() return void
  iio: potentiometer: max5487: Don't return an error in .remove()
  iio: magn: hmc5843: Make hmc5843_common_remove() return void
  iio: health: afe4403: Don't return an error in .remove()
  iio: dac: ad5686: Make ad5686_remove() return void
  iio: dac: ad5592r: Make ad5592r_remove() return void
  iio: dac: ad5446: Make ad5446_remove() return void
  iio: dac: ad5380: Make ad5380_remove() return void
  iio: accel: mma7455: Make mma7455_core_remove() return void
  iio: accel: kxsd9: Make kxsd9_common_remove() return void
  iio: accel: bmi088: Make bmi088_accel_core_remove() return void
  iio: accel: bmc150: Make bmc150_accel_core_remove() return void
  iio: accel: bma400: Make bma400_remove() return void
  drivers:iio:dac:ad5766.c: Add trigger buffer
  iio: triggered-buffer: extend support to configure output buffers
  iio: kfifo-buffer: Add output buffer support
  iio: Add output buffer support
  iio: documentation: Document scd4x calibration use
  drivers: iio: chemical: Add support for Sensirion SCD4x CO2 sensor
  ...

5 files changed, 45 insertions, 63 deletions

diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
index a4ec11a3b68a..1151434038d4 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
@@ -241,8 +241,9 @@ int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
 		fifo_attrs = NULL;
 
 	ret = iio_triggered_buffer_setup_ext(indio_dev,
-					     &iio_pollfunc_store_time,
-					     NULL, NULL, fifo_attrs);
+					     &iio_pollfunc_store_time, NULL,
+					     IIO_BUFFER_DIRECTION_IN,
+					     NULL, fifo_attrs);
 	if (ret) {
 		dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
 		return ret;
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
index 0bbb090b108c..1de395bda03e 100644
--- a/drivers/iio/common/st_sensors/st_sensors_core.c
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -215,17 +215,23 @@ int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
 }
 EXPORT_SYMBOL(st_sensors_set_axis_enable);
 
+static void st_reg_disable(void *reg)
+{
+	regulator_disable(reg);
+}
+
 int st_sensors_power_enable(struct iio_dev *indio_dev)
 {
 	struct st_sensor_data *pdata = iio_priv(indio_dev);
+	struct device *parent = indio_dev->dev.parent;
 	int err;
 
 	/* Regulators not mandatory, but if requested we should enable them. */
-	pdata->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd");
-	if (IS_ERR(pdata->vdd)) {
-		dev_err(&indio_dev->dev, "unable to get Vdd supply\n");
-		return PTR_ERR(pdata->vdd);
-	}
+	pdata->vdd = devm_regulator_get(parent, "vdd");
+	if (IS_ERR(pdata->vdd))
+		return dev_err_probe(&indio_dev->dev, PTR_ERR(pdata->vdd),
+				     "unable to get Vdd supply\n");
+
 	err = regulator_enable(pdata->vdd);
 	if (err != 0) {
 		dev_warn(&indio_dev->dev,
@@ -233,36 +239,26 @@ int st_sensors_power_enable(struct iio_dev *indio_dev)
 		return err;
 	}
 
-	pdata->vdd_io = devm_regulator_get(indio_dev->dev.parent, "vddio");
-	if (IS_ERR(pdata->vdd_io)) {
-		dev_err(&indio_dev->dev, "unable to get Vdd_IO supply\n");
-		err = PTR_ERR(pdata->vdd_io);
-		goto st_sensors_disable_vdd;
-	}
+	err = devm_add_action_or_reset(parent, st_reg_disable, pdata->vdd);
+	if (err)
+		return err;
+
+	pdata->vdd_io = devm_regulator_get(parent, "vddio");
+	if (IS_ERR(pdata->vdd_io))
+		return dev_err_probe(&indio_dev->dev, PTR_ERR(pdata->vdd_io),
+				     "unable to get Vdd_IO supply\n");
+
 	err = regulator_enable(pdata->vdd_io);
 	if (err != 0) {
 		dev_warn(&indio_dev->dev,
 			 "Failed to enable specified Vdd_IO supply\n");
-		goto st_sensors_disable_vdd;
+		return err;
 	}
 
-	return 0;
-
-st_sensors_disable_vdd:
-	regulator_disable(pdata->vdd);
-	return err;
+	return devm_add_action_or_reset(parent, st_reg_disable, pdata->vdd_io);
 }
 EXPORT_SYMBOL(st_sensors_power_enable);
 
-void st_sensors_power_disable(struct iio_dev *indio_dev)
-{
-	struct st_sensor_data *pdata = iio_priv(indio_dev);
-
-	regulator_disable(pdata->vdd);
-	regulator_disable(pdata->vdd_io);
-}
-EXPORT_SYMBOL(st_sensors_power_disable);
-
 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
 					struct st_sensors_platform_data *pdata)
 {
diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c
index b3ff88700866..18bd3c3d99bc 100644
--- a/drivers/iio/common/st_sensors/st_sensors_i2c.c
+++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -57,7 +57,6 @@ int st_sensors_i2c_configure(struct iio_dev *indio_dev,
 
 	indio_dev->name = client->name;
 
-	sdata->dev = &client->dev;
 	sdata->irq = client->irq;
 
 	return 0;
diff --git a/drivers/iio/common/st_sensors/st_sensors_spi.c b/drivers/iio/common/st_sensors/st_sensors_spi.c
index 0d1d66c77cd8..7c60050e90dc 100644
--- a/drivers/iio/common/st_sensors/st_sensors_spi.c
+++ b/drivers/iio/common/st_sensors/st_sensors_spi.c
@@ -109,7 +109,6 @@ int st_sensors_spi_configure(struct iio_dev *indio_dev,
 
 	indio_dev->name = spi->modalias;
 
-	sdata->dev = &spi->dev;
 	sdata->irq = spi->irq;
 
 	return 0;
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
index 64e0a748a855..392d74449886 100644
--- a/drivers/iio/common/st_sensors/st_sensors_trigger.c
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -42,7 +42,8 @@ static bool st_sensors_new_samples_available(struct iio_dev *indio_dev,
 			  sdata->sensor_settings->drdy_irq.stat_drdy.addr,
 			  &status);
 	if (ret < 0) {
-		dev_err(sdata->dev, "error checking samples available\n");
+		dev_err(indio_dev->dev.parent,
+			"error checking samples available\n");
 		return false;
 	}
 
@@ -87,7 +88,7 @@ static irqreturn_t st_sensors_irq_thread(int irq, void *p)
 	    st_sensors_new_samples_available(indio_dev, sdata)) {
 		iio_trigger_poll_chained(p);
 	} else {
-		dev_dbg(sdata->dev, "spurious IRQ\n");
+		dev_dbg(indio_dev->dev.parent, "spurious IRQ\n");
 		return IRQ_NONE;
 	}
 
@@ -107,7 +108,8 @@ static irqreturn_t st_sensors_irq_thread(int irq, void *p)
 	 */
 	while (sdata->hw_irq_trigger &&
 	       st_sensors_new_samples_available(indio_dev, sdata)) {
-		dev_dbg(sdata->dev, "more samples came in during polling\n");
+		dev_dbg(indio_dev->dev.parent,
+			"more samples came in during polling\n");
 		sdata->hw_timestamp = iio_get_time_ns(indio_dev);
 		iio_trigger_poll_chained(p);
 	}
@@ -119,11 +121,12 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 				const struct iio_trigger_ops *trigger_ops)
 {
 	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	struct device *parent = indio_dev->dev.parent;
 	unsigned long irq_trig;
 	int err;
 
-	sdata->trig = iio_trigger_alloc(sdata->dev, "%s-trigger",
-					indio_dev->name);
+	sdata->trig = devm_iio_trigger_alloc(parent, "%s-trigger",
+					     indio_dev->name);
 	if (sdata->trig == NULL) {
 		dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n");
 		return -ENOMEM;
@@ -153,7 +156,7 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 				sdata->sensor_settings->drdy_irq.addr_ihl,
 				sdata->sensor_settings->drdy_irq.mask_ihl, 1);
 			if (err < 0)
-				goto iio_trigger_free;
+				return err;
 			dev_info(&indio_dev->dev,
 				 "interrupts on the falling edge or active low level\n");
 		}
@@ -179,8 +182,7 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 		if (!sdata->sensor_settings->drdy_irq.stat_drdy.addr) {
 			dev_err(&indio_dev->dev,
 				"edge IRQ not supported w/o stat register.\n");
-			err = -EOPNOTSUPP;
-			goto iio_trigger_free;
+			return -EOPNOTSUPP;
 		}
 		sdata->edge_irq = true;
 	} else {
@@ -205,44 +207,29 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 	    sdata->sensor_settings->drdy_irq.stat_drdy.addr)
 		irq_trig |= IRQF_SHARED;
 
-	err = request_threaded_irq(sdata->irq,
-				   st_sensors_irq_handler,
-				   st_sensors_irq_thread,
-				   irq_trig,
-				   sdata->trig->name,
-				   sdata->trig);
+	err = devm_request_threaded_irq(parent,
+					sdata->irq,
+					st_sensors_irq_handler,
+					st_sensors_irq_thread,
+					irq_trig,
+					sdata->trig->name,
+					sdata->trig);
 	if (err) {
 		dev_err(&indio_dev->dev, "failed to request trigger IRQ.\n");
-		goto iio_trigger_free;
+		return err;
 	}
 
-	err = iio_trigger_register(sdata->trig);
+	err = devm_iio_trigger_register(parent, sdata->trig);
 	if (err < 0) {
 		dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
-		goto iio_trigger_register_error;
+		return err;
 	}
 	indio_dev->trig = iio_trigger_get(sdata->trig);
 
 	return 0;
-
-iio_trigger_register_error:
-	free_irq(sdata->irq, sdata->trig);
-iio_trigger_free:
-	iio_trigger_free(sdata->trig);
-	return err;
 }
 EXPORT_SYMBOL(st_sensors_allocate_trigger);
 
-void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
-{
-	struct st_sensor_data *sdata = iio_priv(indio_dev);
-
-	iio_trigger_unregister(sdata->trig);
-	free_irq(sdata->irq, sdata->trig);
-	iio_trigger_free(sdata->trig);
-}
-EXPORT_SYMBOL(st_sensors_deallocate_trigger);
-
 int st_sensors_validate_device(struct iio_trigger *trig,
 			       struct iio_dev *indio_dev)
 {