Linux-libre 4.5-gnu

6 files changed, 273 insertions, 0 deletions

diff --git a/include/linux/iio/buffer-dma.h b/include/linux/iio/buffer-dma.h
new file mode 100644
index 000000000..767467d88
--- /dev/null
+++ b/include/linux/iio/buffer-dma.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright 2013-2015 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef __INDUSTRIALIO_DMA_BUFFER_H__
+#define __INDUSTRIALIO_DMA_BUFFER_H__
+
+#include <linux/list.h>
+#include <linux/kref.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/iio/buffer.h>
+
+struct iio_dma_buffer_queue;
+struct iio_dma_buffer_ops;
+struct device;
+
+struct iio_buffer_block {
+	u32 size;
+	u32 bytes_used;
+};
+
+/**
+ * enum iio_block_state - State of a struct iio_dma_buffer_block
+ * @IIO_BLOCK_STATE_DEQUEUED: Block is not queued
+ * @IIO_BLOCK_STATE_QUEUED: Block is on the incoming queue
+ * @IIO_BLOCK_STATE_ACTIVE: Block is currently being processed by the DMA
+ * @IIO_BLOCK_STATE_DONE: Block is on the outgoing queue
+ * @IIO_BLOCK_STATE_DEAD: Block has been marked as to be freed
+ */
+enum iio_block_state {
+	IIO_BLOCK_STATE_DEQUEUED,
+	IIO_BLOCK_STATE_QUEUED,
+	IIO_BLOCK_STATE_ACTIVE,
+	IIO_BLOCK_STATE_DONE,
+	IIO_BLOCK_STATE_DEAD,
+};
+
+/**
+ * struct iio_dma_buffer_block - IIO buffer block
+ * @head: List head
+ * @size: Total size of the block in bytes
+ * @bytes_used: Number of bytes that contain valid data
+ * @vaddr: Virutal address of the blocks memory
+ * @phys_addr: Physical address of the blocks memory
+ * @queue: Parent DMA buffer queue
+ * @kref: kref used to manage the lifetime of block
+ * @state: Current state of the block
+ */
+struct iio_dma_buffer_block {
+	/* May only be accessed by the owner of the block */
+	struct list_head head;
+	size_t bytes_used;
+
+	/*
+	 * Set during allocation, constant thereafter. May be accessed read-only
+	 * by anybody holding a reference to the block.
+	 */
+	void *vaddr;
+	dma_addr_t phys_addr;
+	size_t size;
+	struct iio_dma_buffer_queue *queue;
+
+	/* Must not be accessed outside the core. */
+	struct kref kref;
+	/*
+	 * Must not be accessed outside the core. Access needs to hold
+	 * queue->list_lock if the block is not owned by the core.
+	 */
+	enum iio_block_state state;
+};
+
+/**
+ * struct iio_dma_buffer_queue_fileio - FileIO state for the DMA buffer
+ * @blocks: Buffer blocks used for fileio
+ * @active_block: Block being used in read()
+ * @pos: Read offset in the active block
+ * @block_size: Size of each block
+ */
+struct iio_dma_buffer_queue_fileio {
+	struct iio_dma_buffer_block *blocks[2];
+	struct iio_dma_buffer_block *active_block;
+	size_t pos;
+	size_t block_size;
+};
+
+/**
+ * struct iio_dma_buffer_queue - DMA buffer base structure
+ * @buffer: IIO buffer base structure
+ * @dev: Parent device
+ * @ops: DMA buffer callbacks
+ * @lock: Protects the incoming list, active and the fields in the fileio
+ *   substruct
+ * @list_lock: Protects lists that contain blocks which can be modified in
+ *   atomic context as well as blocks on those lists. This is the outgoing queue
+ *   list and typically also a list of active blocks in the part that handles
+ *   the DMA controller
+ * @incoming: List of buffers on the incoming queue
+ * @outgoing: List of buffers on the outgoing queue
+ * @active: Whether the buffer is currently active
+ * @fileio: FileIO state
+ */
+struct iio_dma_buffer_queue {
+	struct iio_buffer buffer;
+	struct device *dev;
+	const struct iio_dma_buffer_ops *ops;
+
+	struct mutex lock;
+	spinlock_t list_lock;
+	struct list_head incoming;
+	struct list_head outgoing;
+
+	bool active;
+
+	struct iio_dma_buffer_queue_fileio fileio;
+};
+
+/**
+ * struct iio_dma_buffer_ops - DMA buffer callback operations
+ * @submit: Called when a block is submitted to the DMA controller
+ * @abort: Should abort all pending transfers
+ */
+struct iio_dma_buffer_ops {
+	int (*submit)(struct iio_dma_buffer_queue *queue,
+		struct iio_dma_buffer_block *block);
+	void (*abort)(struct iio_dma_buffer_queue *queue);
+};
+
+void iio_dma_buffer_block_done(struct iio_dma_buffer_block *block);
+void iio_dma_buffer_block_list_abort(struct iio_dma_buffer_queue *queue,
+	struct list_head *list);
+
+int iio_dma_buffer_enable(struct iio_buffer *buffer,
+	struct iio_dev *indio_dev);
+int iio_dma_buffer_disable(struct iio_buffer *buffer,
+	struct iio_dev *indio_dev);
+int iio_dma_buffer_read(struct iio_buffer *buffer, size_t n,
+	char __user *user_buffer);
+size_t iio_dma_buffer_data_available(struct iio_buffer *buffer);
+int iio_dma_buffer_set_bytes_per_datum(struct iio_buffer *buffer, size_t bpd);
+int iio_dma_buffer_set_length(struct iio_buffer *buffer, int length);
+int iio_dma_buffer_request_update(struct iio_buffer *buffer);
+
+int iio_dma_buffer_init(struct iio_dma_buffer_queue *queue,
+	struct device *dma_dev, const struct iio_dma_buffer_ops *ops);
+void iio_dma_buffer_exit(struct iio_dma_buffer_queue *queue);
+void iio_dma_buffer_release(struct iio_dma_buffer_queue *queue);
+
+#endif
diff --git a/include/linux/iio/buffer-dmaengine.h b/include/linux/iio/buffer-dmaengine.h
new file mode 100644
index 000000000..5dcddf427
--- /dev/null
+++ b/include/linux/iio/buffer-dmaengine.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2014-2015 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __IIO_DMAENGINE_H__
+#define __IIO_DMAENGINE_H__
+
+struct iio_buffer;
+struct device;
+
+struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
+	const char *channel);
+void iio_dmaengine_buffer_free(struct iio_buffer *buffer);
+
+#endif
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index 1600c5582..2ec3ad58e 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -18,6 +18,12 @@
 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)
@@ -27,9 +33,15 @@ struct iio_buffer;
  *			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
@@ -51,9 +63,13 @@ struct iio_buffer_access_funcs {
 	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;
 };
 
 /**
diff --git a/include/linux/iio/configfs.h b/include/linux/iio/configfs.h
new file mode 100644
index 000000000..93befd67c
--- /dev/null
+++ b/include/linux/iio/configfs.h
@@ -0,0 +1,15 @@
+/*
+ * Industrial I/O configfs support
+ *
+ * Copyright (c) 2015 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#ifndef __IIO_CONFIGFS
+#define __IIO_CONFIGFS
+
+extern struct configfs_subsystem iio_configfs_subsys;
+
+#endif /* __IIO_CONFIGFS */
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 19c94c9ac..b58941187 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -636,6 +636,8 @@ static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
 }
 #endif
 
+ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
+
 int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer,
 	int *fract);
 
diff --git a/include/linux/iio/sw_trigger.h b/include/linux/iio/sw_trigger.h
new file mode 100644
index 000000000..5198f8ed0
--- /dev/null
+++ b/include/linux/iio/sw_trigger.h
@@ -0,0 +1,70 @@
+/*
+ * Industrial I/O software trigger interface
+ *
+ * Copyright (c) 2015 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef __IIO_SW_TRIGGER
+#define __IIO_SW_TRIGGER
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/iio/iio.h>
+#include <linux/configfs.h>
+
+#define module_iio_sw_trigger_driver(__iio_sw_trigger_type) \
+	module_driver(__iio_sw_trigger_type, iio_register_sw_trigger_type, \
+		      iio_unregister_sw_trigger_type)
+
+struct iio_sw_trigger_ops;
+
+struct iio_sw_trigger_type {
+	const char *name;
+	struct module *owner;
+	const struct iio_sw_trigger_ops *ops;
+	struct list_head list;
+	struct config_group *group;
+};
+
+struct iio_sw_trigger {
+	struct iio_trigger *trigger;
+	struct iio_sw_trigger_type *trigger_type;
+	struct config_group group;
+};
+
+struct iio_sw_trigger_ops {
+	struct iio_sw_trigger* (*probe)(const char *);
+	int (*remove)(struct iio_sw_trigger *);
+};
+
+static inline
+struct iio_sw_trigger *to_iio_sw_trigger(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct iio_sw_trigger,
+			    group);
+}
+
+int iio_register_sw_trigger_type(struct iio_sw_trigger_type *tt);
+void iio_unregister_sw_trigger_type(struct iio_sw_trigger_type *tt);
+
+struct iio_sw_trigger *iio_sw_trigger_create(const char *, const char *);
+void iio_sw_trigger_destroy(struct iio_sw_trigger *);
+
+int iio_sw_trigger_type_configfs_register(struct iio_sw_trigger_type *tt);
+void iio_sw_trigger_type_configfs_unregister(struct iio_sw_trigger_type *tt);
+
+static inline
+void iio_swt_group_init_type_name(struct iio_sw_trigger *t,
+				  const char *name,
+				  struct config_item_type *type)
+{
+#ifdef CONFIG_CONFIGFS_FS
+	config_group_init_type_name(&t->group, name, type);
+#endif
+}
+
+#endif /* __IIO_SW_TRIGGER */