Merge tag 'iio-for-4.11a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

First round of new device support, features and cleanups for IIO in the 4.11 cycle.

It's shaping to be another fairly busy cycle. Lots more on the way!

New device support
* ads7950
  - new driver supporting ads7950, ads7951, ads7952, ads7953, ads7954,
  ads7955, ads7956, ads7957, ads7958, ads7959, ads7960, and ads7961 ADCs.
* cm3605
  - New driver for this light sensor and proximity sensor  which is an
  analog part with some additional digital controls.
* hx711
  - New driver.

Core new stuff
* Gravity sensor type.  This is a processed datastream in which the device
will try to work out which way is down.
* Split the buffer.h file into two parts. One provides the interface to 'use'
a buffer, the second provides the internals of the buffer functionality as
needed by implementations of buffers.
  - Move documentation inline so as to allow use of private: tag when
  generating documentation.
  - Add some utility functions for the few things that are directly done
  with the buffers.
  - Stop exporting functions that no-one uses outside of the core code.
  - Push docs down by the code in the c file where they should have always
  been.
  - Fix typo in kernel-doc for buffer.
  - push down some includes that were previously happening implicitly.
  - stop enabling the timestamp of the dummy device.

Features and cleanups
* ad5592r
  - ACPI support
* ad5593r
  -ACPI support.
* ad5933
  - Fix a false comment about size of a particular register.
* ad7150
  - replace S_IRUGO | S_IWUSR with 0644.  I'm not that keen on these patches
  in general, but as it was nicely presented I took this one anyway. As a
  general rule will only take these as part of a larger driver cleanup.
  - don't eat an error but rather reutnr it in the write_event_config callback.
* ad7606
  - replace non standard range attibute with _scale
* ade7753
  - use usleep_range for short sleeps
* ade7754
  - use usleep_range for short sleeps
* ade7758
  - use usleep_range for short sleeps
* ade7759
  - use usleep_range for short sleeps
* ade7854
  - use usleep_range for short sleeps
* adis16201
  - fix description
* adis16203
  - fix description
  - fix copyright year
* adis16209
  - fix description
* adt7316
  - Add braces to arms of if else statement (for consistency)
  - Alignment fixes.
* axp288
  - Fix up an issue with accidental overwrites of data.
* bmi160
  - add deivce tables for i2c and spi to support correctly identifying the
  full dt name (including manufacturer).
  - device tree binding.
* bmp280
  - use usleep_range for short sleeps.
* cm3232
  - return error from cm3232_reg_init rather than eating it if the last write
  fails.
* dummy driver
  - remove a semicolor found at end of a function defintition.
* exynos-adc
  - use usleep_range for short sleeps.
* hid-sensor (accel)
  - Add timestamp support.  The hardware can provide timestamps so lets support
  them. If not fall back to timestamps estimated in kernel.
* hid-sensor (light)
  - Add a duplicate ID for the light channels so as to keep existing interface
  whilst also using the more standard IIO interface.
* hts221
  - acpi probing
* imx25-gcq
  - Add a macro call to allow this driver to be automatically loaded.
* isl29028
  - reorganise code to avoid deep nesting of if statements.
  - move chip test and default regs into a function suitable or sharing with
  power management code.
  - tidy up some code alignment.
* lidar-lite-v3
  - introduce compatible strings that make it clear Garmin have consideral
  friends.
* mma8452
  - avoid returning signed value when unsigned is appropriate
* spmi-vadc
  - Update function for generic voltage conversion to take into account that
  different channels on this device should be handled differently.
  - Rework code to allow per channel voltage scaling and support the standard
  options for this hardware.
  - Fixup three minor issues with the above patches for this part. These all
  effect test builds rather than the native builds for the part, but good to
  clean them up anyway.
* st_sensors
  - support device matching from the ACPI DST tables.
  - acpi based probing for accelerometers
  - acpi based probing for pressure sensors
  - Allow pressure sensors to read negative values.
  - Export sampling frequency for lps25h and lps331ap.
  - Add support for the old DT bindings from the period when these deivces
  were often supported through windows.

Docs fixup:
* typo in sysfs-bus-iio

7 files changed, 188 insertions, 157 deletions

diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index dd85f35..7ef111d 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h
@@ -232,6 +232,7 @@ struct hid_sensor_common {
 	atomic_t data_ready;
 	atomic_t user_requested_state;
 	struct iio_trigger *trigger;
+	int timestamp_ns_scale;
 	struct hid_sensor_hub_attribute_info poll;
 	struct hid_sensor_hub_attribute_info report_state;
 	struct hid_sensor_hub_attribute_info power_state;
@@ -271,4 +272,7 @@ int hid_sensor_format_scale(u32 usage_id,
 
 s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);
 
+int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
+				     int64_t raw_value);
+
 #endif
diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
index f2ee90a..30c7dc4 100644
--- a/include/linux/hid-sensor-ids.h
+++ b/include/linux/hid-sensor-ids.h
@@ -52,6 +52,9 @@
 #define HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS			0x200458
 #define HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS			0x200459
 
+/* Gravity vector */
+#define HID_USAGE_SENSOR_GRAVITY_VECTOR				0x20007B
+
 /* ORIENTATION: Compass 3D: (200083) */
 #define HID_USAGE_SENSOR_COMPASS_3D				0x200083
 #define HID_USAGE_SENSOR_DATA_ORIENTATION			0x200470
@@ -95,6 +98,7 @@
 #define HID_USAGE_SENSOR_TIME_HOUR				0x200525
 #define HID_USAGE_SENSOR_TIME_MINUTE				0x200526
 #define HID_USAGE_SENSOR_TIME_SECOND				0x200527
+#define HID_USAGE_SENSOR_TIME_TIMESTAMP				0x200529
 
 /* Units */
 #define HID_USAGE_SENSOR_UNITS_NOT_SPECIFIED			0x00
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index 70a5164..48767c7 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -11,139 +11,15 @@
 #define _IIO_BUFFER_GENERIC_H_
 #include <linux/sysfs.h>
 #include <linux/iio/iio.h>
-#include <linux/kref.h>
-
-#ifdef CONFIG_IIO_BUFFER
 
 struct iio_buffer;
 
-/**
- * INDIO_BUFFER_FLAG_FIXED_WATERMARK - Watermark level of the buffer can not be
- *   configured. It has a fixed value which will be buffer specific.
- */
-#define INDIO_BUFFER_FLAG_FIXED_WATERMARK BIT(0)
-
-/**
- * struct iio_buffer_access_funcs - access functions for buffers.
- * @store_to:		actually store stuff to the buffer
- * @read_first_n:	try to get a specified number of bytes (must exist)
- * @data_available:	indicates how much data is available for reading from
- *			the buffer.
- * @request_update:	if a parameter change has been marked, update underlying
- *			storage.
- * @set_bytes_per_datum:set number of bytes per datum
- * @set_length:		set number of datums in buffer
- * @enable:             called if the buffer is attached to a device and the
- *                      device starts sampling. Calls are balanced with
- *                      @disable.
- * @disable:            called if the buffer is attached to a device and the
- *                      device stops sampling. Calles are balanced with @enable.
- * @release:		called when the last reference to the buffer is dropped,
- *			should free all resources allocated by the buffer.
- * @modes:		Supported operating modes by this buffer type
- * @flags:		A bitmask combination of INDIO_BUFFER_FLAG_*
- *
- * The purpose of this structure is to make the buffer element
- * modular as event for a given driver, different usecases may require
- * different buffer designs (space efficiency vs speed for example).
- *
- * It is worth noting that a given buffer implementation may only support a
- * small proportion of these functions.  The core code 'should' cope fine with
- * any of them not existing.
- **/
-struct iio_buffer_access_funcs {
-	int (*store_to)(struct iio_buffer *buffer, const void *data);
-	int (*read_first_n)(struct iio_buffer *buffer,
-			    size_t n,
-			    char __user *buf);
-	size_t (*data_available)(struct iio_buffer *buffer);
-
-	int (*request_update)(struct iio_buffer *buffer);
-
-	int (*set_bytes_per_datum)(struct iio_buffer *buffer, size_t bpd);
-	int (*set_length)(struct iio_buffer *buffer, int length);
-
-	int (*enable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
-	int (*disable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
-
-	void (*release)(struct iio_buffer *buffer);
-
-	unsigned int modes;
-	unsigned int flags;
-};
-
-/**
- * struct iio_buffer - general buffer structure
- * @length:		[DEVICE] number of datums in buffer
- * @bytes_per_datum:	[DEVICE] size of individual datum including timestamp
- * @scan_el_attrs:	[DRIVER] control of scan elements if that scan mode
- *			control method is used
- * @scan_mask:		[INTERN] bitmask used in masking scan mode elements
- * @scan_timestamp:	[INTERN] does the scan mode include a timestamp
- * @access:		[DRIVER] buffer access functions associated with the
- *			implementation.
- * @scan_el_dev_attr_list:[INTERN] list of scan element related attributes.
- * @buffer_group:	[INTERN] attributes of the buffer group
- * @scan_el_group:	[DRIVER] attribute group for those attributes not
- *			created from the iio_chan_info array.
- * @pollq:		[INTERN] wait queue to allow for polling on the buffer.
- * @stufftoread:	[INTERN] flag to indicate new data.
- * @attrs:		[INTERN] standard attributes of the buffer
- * @demux_list:		[INTERN] list of operations required to demux the scan.
- * @demux_bounce:	[INTERN] buffer for doing gather from incoming scan.
- * @buffer_list:	[INTERN] entry in the devices list of current buffers.
- * @ref:		[INTERN] reference count of the buffer.
- * @watermark:		[INTERN] number of datums to wait for poll/read.
- */
-struct iio_buffer {
-	int					length;
-	int					bytes_per_datum;
-	struct attribute_group			*scan_el_attrs;
-	long					*scan_mask;
-	bool					scan_timestamp;
-	const struct iio_buffer_access_funcs	*access;
-	struct list_head			scan_el_dev_attr_list;
-	struct attribute_group			buffer_group;
-	struct attribute_group			scan_el_group;
-	wait_queue_head_t			pollq;
-	bool					stufftoread;
-	const struct attribute			**attrs;
-	struct list_head			demux_list;
-	void					*demux_bounce;
-	struct list_head			buffer_list;
-	struct kref				ref;
-	unsigned int				watermark;
-};
-
-/**
- * iio_update_buffers() - add or remove buffer from active list
- * @indio_dev:		device to add buffer to
- * @insert_buffer:	buffer to insert
- * @remove_buffer:	buffer_to_remove
- *
- * Note this will tear down the all buffering and build it up again
- */
-int iio_update_buffers(struct iio_dev *indio_dev,
-		       struct iio_buffer *insert_buffer,
-		       struct iio_buffer *remove_buffer);
-
-/**
- * iio_buffer_init() - Initialize the buffer structure
- * @buffer:		buffer to be initialized
- **/
-void iio_buffer_init(struct iio_buffer *buffer);
+void iio_buffer_set_attrs(struct iio_buffer *buffer,
+			 const struct attribute **attrs);
 
-int iio_scan_mask_query(struct iio_dev *indio_dev,
-			struct iio_buffer *buffer, int bit);
-
-/**
- * iio_push_to_buffers() - push to a registered buffer.
- * @indio_dev:		iio_dev structure for device.
- * @data:		Full scan.
- */
 int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data);
 
-/*
+/**
  * iio_push_to_buffers_with_timestamp() - push data and timestamp to buffers
  * @indio_dev:		iio_dev structure for device.
  * @data:		sample data
@@ -168,34 +44,10 @@ static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev,
 	return iio_push_to_buffers(indio_dev, data);
 }
 
-int iio_update_demux(struct iio_dev *indio_dev);
-
 bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
-	const unsigned long *mask);
-
-struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer);
-void iio_buffer_put(struct iio_buffer *buffer);
-
-/**
- * iio_device_attach_buffer - Attach a buffer to a IIO device
- * @indio_dev: The device the buffer should be attached to
- * @buffer: The buffer to attach to the device
- *
- * This function attaches a buffer to a IIO device. The buffer stays attached to
- * the device until the device is freed. The function should only be called at
- * most once per device.
- */
-static inline void iio_device_attach_buffer(struct iio_dev *indio_dev,
-	struct iio_buffer *buffer)
-{
-	indio_dev->buffer = iio_buffer_get(buffer);
-}
-
-#else /* CONFIG_IIO_BUFFER */
-
-static inline void iio_buffer_get(struct iio_buffer *buffer) {}
-static inline void iio_buffer_put(struct iio_buffer *buffer) {}
+				   const unsigned long *mask);
 
-#endif /* CONFIG_IIO_BUFFER */
+void iio_device_attach_buffer(struct iio_dev *indio_dev,
+			      struct iio_buffer *buffer);
 
 #endif /* _IIO_BUFFER_GENERIC_H_ */
diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
new file mode 100644
index 0000000..8daba19
--- /dev/null
+++ b/include/linux/iio/buffer_impl.h
@@ -0,0 +1,162 @@
+#ifndef _IIO_BUFFER_GENERIC_IMPL_H_
+#define _IIO_BUFFER_GENERIC_IMPL_H_
+#include <linux/sysfs.h>
+#include <linux/kref.h>
+
+#ifdef CONFIG_IIO_BUFFER
+
+struct iio_dev;
+struct iio_buffer;
+
+/**
+ * INDIO_BUFFER_FLAG_FIXED_WATERMARK - Watermark level of the buffer can not be
+ *   configured. It has a fixed value which will be buffer specific.
+ */
+#define INDIO_BUFFER_FLAG_FIXED_WATERMARK BIT(0)
+
+/**
+ * struct iio_buffer_access_funcs - access functions for buffers.
+ * @store_to:		actually store stuff to the buffer
+ * @read_first_n:	try to get a specified number of bytes (must exist)
+ * @data_available:	indicates how much data is available for reading from
+ *			the buffer.
+ * @request_update:	if a parameter change has been marked, update underlying
+ *			storage.
+ * @set_bytes_per_datum:set number of bytes per datum
+ * @set_length:		set number of datums in buffer
+ * @enable:             called if the buffer is attached to a device and the
+ *                      device starts sampling. Calls are balanced with
+ *                      @disable.
+ * @disable:            called if the buffer is attached to a device and the
+ *                      device stops sampling. Calles are balanced with @enable.
+ * @release:		called when the last reference to the buffer is dropped,
+ *			should free all resources allocated by the buffer.
+ * @modes:		Supported operating modes by this buffer type
+ * @flags:		A bitmask combination of INDIO_BUFFER_FLAG_*
+ *
+ * The purpose of this structure is to make the buffer element
+ * modular as event for a given driver, different usecases may require
+ * different buffer designs (space efficiency vs speed for example).
+ *
+ * It is worth noting that a given buffer implementation may only support a
+ * small proportion of these functions.  The core code 'should' cope fine with
+ * any of them not existing.
+ **/
+struct iio_buffer_access_funcs {
+	int (*store_to)(struct iio_buffer *buffer, const void *data);
+	int (*read_first_n)(struct iio_buffer *buffer,
+			    size_t n,
+			    char __user *buf);
+	size_t (*data_available)(struct iio_buffer *buffer);
+
+	int (*request_update)(struct iio_buffer *buffer);
+
+	int (*set_bytes_per_datum)(struct iio_buffer *buffer, size_t bpd);
+	int (*set_length)(struct iio_buffer *buffer, int length);
+
+	int (*enable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
+	int (*disable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
+
+	void (*release)(struct iio_buffer *buffer);
+
+	unsigned int modes;
+	unsigned int flags;
+};
+
+/**
+ * struct iio_buffer - general buffer structure
+ *
+ * Note that the internals of this structure should only be of interest to
+ * those writing new buffer implementations.
+ */
+struct iio_buffer {
+	/** @length: Number of datums in buffer. */
+	int length;
+
+	/**  @bytes_per_datum: Size of individual datum including timestamp. */
+	int bytes_per_datum;
+
+	/**
+	 * @access: Buffer access functions associated with the
+	 * implementation.
+	 */
+	const struct iio_buffer_access_funcs *access;
+
+	/** @scan_mask: Bitmask used in masking scan mode elements. */
+	long *scan_mask;
+
+	/** @demux_list: List of operations required to demux the scan. */
+	struct list_head demux_list;
+
+	/** @pollq: Wait queue to allow for polling on the buffer. */
+	wait_queue_head_t pollq;
+
+	/** @watermark: Number of datums to wait for poll/read. */
+	unsigned int watermark;
+
+	/* private: */
+	/*
+	 * @scan_el_attrs: Control of scan elements if that scan mode
+	 * control method is used.
+	 */
+	struct attribute_group *scan_el_attrs;
+
+	/* @scan_timestamp: Does the scan mode include a timestamp. */
+	bool scan_timestamp;
+
+	/* @scan_el_dev_attr_list: List of scan element related attributes. */
+	struct list_head scan_el_dev_attr_list;
+
+	/* @buffer_group: Attributes of the buffer group. */
+	struct attribute_group buffer_group;
+
+	/*
+	 * @scan_el_group: Attribute group for those attributes not
+	 * created from the iio_chan_info array.
+	 */
+	struct attribute_group scan_el_group;
+
+	/* @stufftoread: Flag to indicate new data. */
+	bool stufftoread;
+
+	/* @attrs: Standard attributes of the buffer. */
+	const struct attribute **attrs;
+
+	/* @demux_bounce: Buffer for doing gather from incoming scan. */
+	void *demux_bounce;
+
+	/* @buffer_list: Entry in the devices list of current buffers. */
+	struct list_head buffer_list;
+
+	/* @ref: Reference count of the buffer. */
+	struct kref ref;
+};
+
+/**
+ * iio_update_buffers() - add or remove buffer from active list
+ * @indio_dev:		device to add buffer to
+ * @insert_buffer:	buffer to insert
+ * @remove_buffer:	buffer_to_remove
+ *
+ * Note this will tear down the all buffering and build it up again
+ */
+int iio_update_buffers(struct iio_dev *indio_dev,
+		       struct iio_buffer *insert_buffer,
+		       struct iio_buffer *remove_buffer);
+
+/**
+ * iio_buffer_init() - Initialize the buffer structure
+ * @buffer:		buffer to be initialized
+ **/
+void iio_buffer_init(struct iio_buffer *buffer);
+
+struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer);
+void iio_buffer_put(struct iio_buffer *buffer);
+
+#else /* CONFIG_IIO_BUFFER */
+
+static inline void iio_buffer_get(struct iio_buffer *buffer) {}
+static inline void iio_buffer_put(struct iio_buffer *buffer) {}
+
+#endif /* CONFIG_IIO_BUFFER */
+#endif /* _IIO_BUFFER_GENERIC_IMPL_H_ */
diff --git a/include/linux/iio/common/st_sensors_i2c.h b/include/linux/iio/common/st_sensors_i2c.h
index 1796af0..254de3c 100644
--- a/include/linux/iio/common/st_sensors_i2c.h
+++ b/include/linux/iio/common/st_sensors_i2c.h
@@ -28,4 +28,13 @@ static inline void st_sensors_of_i2c_probe(struct i2c_client *client,
 }
 #endif
 
+#ifdef CONFIG_ACPI
+int st_sensors_match_acpi_device(struct device *dev);
+#else
+static inline int st_sensors_match_acpi_device(struct device *dev)
+{
+	return -ENODEV;
+}
+#endif
+
 #endif /* ST_SENSORS_I2C_H */
diff --git a/include/linux/iio/kfifo_buf.h b/include/linux/iio/kfifo_buf.h
index 1683bc7..027cfa9 100644
--- a/include/linux/iio/kfifo_buf.h
+++ b/include/linux/iio/kfifo_buf.h
@@ -1,9 +1,8 @@
 #ifndef __LINUX_IIO_KFIFO_BUF_H__
 #define __LINUX_IIO_KFIFO_BUF_H__
 
-#include <linux/kfifo.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/buffer.h>
+struct iio_buffer;
+struct device;
 
 struct iio_buffer *iio_kfifo_allocate(void);
 void iio_kfifo_free(struct iio_buffer *r);
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index e54d14a..ffafd6c 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -42,6 +42,7 @@ enum iio_chan_type {
 	IIO_ELECTRICALCONDUCTIVITY,
 	IIO_COUNT,
 	IIO_INDEX,
+	IIO_GRAVITY,
 };
 
 enum iio_modifier {