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path: root/drivers/staging/iio/industrialio-ring.c
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-rw-r--r--drivers/staging/iio/industrialio-ring.c596
1 files changed, 0 insertions, 596 deletions
diff --git a/drivers/staging/iio/industrialio-ring.c b/drivers/staging/iio/industrialio-ring.c
deleted file mode 100644
index 843eb82..0000000
--- a/drivers/staging/iio/industrialio-ring.c
+++ /dev/null
@@ -1,596 +0,0 @@
-/* The industrial I/O core
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * 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.
- *
- * Handling of ring allocation / resizing.
- *
- *
- * Things to look at here.
- * - Better memory allocation techniques?
- * - Alternative access techniques?
- */
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/fs.h>
-#include <linux/cdev.h>
-#include <linux/slab.h>
-#include <linux/poll.h>
-
-#include "iio.h"
-#include "ring_generic.h"
-
-/**
- * iio_ring_open() - chrdev file open for ring buffer access
- *
- * This function relies on all ring buffer implementations having an
- * iio_ring_buffer as their first element.
- **/
-static int iio_ring_open(struct inode *inode, struct file *filp)
-{
- struct iio_handler *hand
- = container_of(inode->i_cdev, struct iio_handler, chrdev);
- struct iio_ring_buffer *rb = hand->private;
-
- filp->private_data = hand->private;
- if (rb->access->mark_in_use)
- rb->access->mark_in_use(rb);
-
- return 0;
-}
-
-/**
- * iio_ring_release() - chrdev file close ring buffer access
- *
- * This function relies on all ring buffer implementations having an
- * iio_ring_buffer as their first element.
- **/
-static int iio_ring_release(struct inode *inode, struct file *filp)
-{
- struct cdev *cd = inode->i_cdev;
- struct iio_handler *hand = iio_cdev_to_handler(cd);
- struct iio_ring_buffer *rb = hand->private;
-
- clear_bit(IIO_BUSY_BIT_POS, &rb->access_handler.flags);
- if (rb->access->unmark_in_use)
- rb->access->unmark_in_use(rb);
-
- return 0;
-}
-
-/**
- * iio_ring_read_first_n_outer() - chrdev read for ring buffer access
- *
- * This function relies on all ring buffer implementations having an
- * iio_ring _bufer as their first element.
- **/
-static ssize_t iio_ring_read_first_n_outer(struct file *filp, char __user *buf,
- size_t n, loff_t *f_ps)
-{
- struct iio_ring_buffer *rb = filp->private_data;
-
- if (!rb->access->read_first_n)
- return -EINVAL;
- return rb->access->read_first_n(rb, n, buf);
-}
-
-/**
- * iio_ring_poll() - poll the ring to find out if it has data
- */
-static unsigned int iio_ring_poll(struct file *filp,
- struct poll_table_struct *wait)
-{
- struct iio_ring_buffer *rb = filp->private_data;
-
- poll_wait(filp, &rb->pollq, wait);
- if (rb->stufftoread)
- return POLLIN | POLLRDNORM;
- /* need a way of knowing if there may be enough data... */
- return 0;
-}
-
-static const struct file_operations iio_ring_fileops = {
- .read = iio_ring_read_first_n_outer,
- .release = iio_ring_release,
- .open = iio_ring_open,
- .poll = iio_ring_poll,
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
-};
-
-void iio_ring_access_release(struct device *dev)
-{
- struct iio_ring_buffer *buf
- = container_of(dev, struct iio_ring_buffer, dev);
- cdev_del(&buf->access_handler.chrdev);
- iio_device_free_chrdev_minor(MINOR(dev->devt));
-}
-EXPORT_SYMBOL(iio_ring_access_release);
-
-static inline int
-__iio_request_ring_buffer_chrdev(struct iio_ring_buffer *buf,
- struct module *owner,
- int id)
-{
- int ret;
-
- buf->access_handler.flags = 0;
- buf->dev.bus = &iio_bus_type;
- device_initialize(&buf->dev);
-
- ret = iio_device_get_chrdev_minor();
- if (ret < 0)
- goto error_device_put;
-
- buf->dev.devt = MKDEV(MAJOR(iio_devt), ret);
- dev_set_name(&buf->dev, "%s:buffer%d",
- dev_name(buf->dev.parent),
- id);
- ret = device_add(&buf->dev);
- if (ret < 0) {
- printk(KERN_ERR "failed to add the ring dev\n");
- goto error_device_put;
- }
- cdev_init(&buf->access_handler.chrdev, &iio_ring_fileops);
- buf->access_handler.chrdev.owner = owner;
- ret = cdev_add(&buf->access_handler.chrdev, buf->dev.devt, 1);
- if (ret) {
- printk(KERN_ERR "failed to allocate ring chrdev\n");
- goto error_device_unregister;
- }
- return 0;
-
-error_device_unregister:
- device_unregister(&buf->dev);
-error_device_put:
- put_device(&buf->dev);
-
- return ret;
-}
-
-static void __iio_free_ring_buffer_chrdev(struct iio_ring_buffer *buf)
-{
- device_unregister(&buf->dev);
-}
-
-void iio_ring_buffer_init(struct iio_ring_buffer *ring,
- struct iio_dev *dev_info)
-{
- ring->indio_dev = dev_info;
- ring->access_handler.private = ring;
- init_waitqueue_head(&ring->pollq);
-}
-EXPORT_SYMBOL(iio_ring_buffer_init);
-
-static ssize_t iio_show_scan_index(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index);
-}
-
-static ssize_t iio_show_fixed_type(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- return sprintf(buf, "%c%d/%d>>%u\n",
- this_attr->c->scan_type.sign,
- this_attr->c->scan_type.realbits,
- this_attr->c->scan_type.storagebits,
- this_attr->c->scan_type.shift);
-}
-
-static ssize_t iio_scan_el_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- int ret;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-
- ret = iio_scan_mask_query(ring, to_iio_dev_attr(attr)->address);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", ret);
-}
-
-static int iio_scan_mask_clear(struct iio_ring_buffer *ring, int bit)
-{
- if (bit > IIO_MAX_SCAN_LENGTH)
- return -EINVAL;
- ring->scan_mask &= ~(1 << bit);
- ring->scan_count--;
- return 0;
-}
-
-static ssize_t iio_scan_el_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret = 0;
- bool state;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- struct iio_dev *indio_dev = ring->indio_dev;
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
- state = !(buf[0] == '0');
- mutex_lock(&indio_dev->mlock);
- if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
- ret = -EBUSY;
- goto error_ret;
- }
- ret = iio_scan_mask_query(ring, this_attr->address);
- if (ret < 0)
- goto error_ret;
- if (!state && ret) {
- ret = iio_scan_mask_clear(ring, this_attr->address);
- if (ret)
- goto error_ret;
- } else if (state && !ret) {
- ret = iio_scan_mask_set(ring, this_attr->address);
- if (ret)
- goto error_ret;
- }
-
-error_ret:
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-
-}
-
-static ssize_t iio_scan_el_ts_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", ring->scan_timestamp);
-}
-
-static ssize_t iio_scan_el_ts_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret = 0;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- struct iio_dev *indio_dev = ring->indio_dev;
- bool state;
- state = !(buf[0] == '0');
- mutex_lock(&indio_dev->mlock);
- if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
- ret = -EBUSY;
- goto error_ret;
- }
- ring->scan_timestamp = state;
-error_ret:
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-}
-
-static int iio_ring_add_channel_sysfs(struct iio_ring_buffer *ring,
- const struct iio_chan_spec *chan)
-{
- int ret;
-
- ret = __iio_add_chan_devattr("index", "scan_elements",
- chan,
- &iio_show_scan_index,
- NULL,
- 0,
- 0,
- &ring->dev,
- &ring->scan_el_dev_attr_list);
- if (ret)
- goto error_ret;
-
- ret = __iio_add_chan_devattr("type", "scan_elements",
- chan,
- &iio_show_fixed_type,
- NULL,
- 0,
- 0,
- &ring->dev,
- &ring->scan_el_dev_attr_list);
- if (ret)
- goto error_ret;
-
- if (chan->type != IIO_TIMESTAMP)
- ret = __iio_add_chan_devattr("en", "scan_elements",
- chan,
- &iio_scan_el_show,
- &iio_scan_el_store,
- chan->scan_index,
- 0,
- &ring->dev,
- &ring->scan_el_dev_attr_list);
- else
- ret = __iio_add_chan_devattr("en", "scan_elements",
- chan,
- &iio_scan_el_ts_show,
- &iio_scan_el_ts_store,
- chan->scan_index,
- 0,
- &ring->dev,
- &ring->scan_el_dev_attr_list);
-error_ret:
- return ret;
-}
-
-static void iio_ring_remove_and_free_scan_dev_attr(struct iio_ring_buffer *ring,
- struct iio_dev_attr *p)
-{
- sysfs_remove_file_from_group(&ring->dev.kobj,
- &p->dev_attr.attr, "scan_elements");
- kfree(p->dev_attr.attr.name);
- kfree(p);
-}
-
-static struct attribute *iio_scan_el_dummy_attrs[] = {
- NULL
-};
-
-static struct attribute_group iio_scan_el_dummy_group = {
- .name = "scan_elements",
- .attrs = iio_scan_el_dummy_attrs
-};
-
-static void __iio_ring_attr_cleanup(struct iio_ring_buffer *ring)
-{
- struct iio_dev_attr *p, *n;
- int anydynamic = !list_empty(&ring->scan_el_dev_attr_list);
- list_for_each_entry_safe(p, n,
- &ring->scan_el_dev_attr_list, l)
- iio_ring_remove_and_free_scan_dev_attr(ring, p);
-
- if (ring->scan_el_attrs)
- sysfs_remove_group(&ring->dev.kobj,
- ring->scan_el_attrs);
- else if (anydynamic)
- sysfs_remove_group(&ring->dev.kobj,
- &iio_scan_el_dummy_group);
-}
-
-int iio_ring_buffer_register_ex(struct iio_ring_buffer *ring, int id,
- const struct iio_chan_spec *channels,
- int num_channels)
-{
- int ret, i;
-
- ret = __iio_request_ring_buffer_chrdev(ring, ring->owner, id);
- if (ret)
- goto error_ret;
-
- if (ring->scan_el_attrs) {
- ret = sysfs_create_group(&ring->dev.kobj,
- ring->scan_el_attrs);
- if (ret) {
- dev_err(&ring->dev,
- "Failed to add sysfs scan elements\n");
- goto error_free_ring_buffer_chrdev;
- }
- } else if (channels) {
- ret = sysfs_create_group(&ring->dev.kobj,
- &iio_scan_el_dummy_group);
- if (ret)
- goto error_free_ring_buffer_chrdev;
- }
-
- INIT_LIST_HEAD(&ring->scan_el_dev_attr_list);
- if (channels) {
- /* new magic */
- for (i = 0; i < num_channels; i++) {
- ret = iio_ring_add_channel_sysfs(ring, &channels[i]);
- if (ret < 0)
- goto error_cleanup_dynamic;
- }
- }
-
- return 0;
-error_cleanup_dynamic:
- __iio_ring_attr_cleanup(ring);
-error_free_ring_buffer_chrdev:
- __iio_free_ring_buffer_chrdev(ring);
-error_ret:
- return ret;
-}
-EXPORT_SYMBOL(iio_ring_buffer_register_ex);
-
-void iio_ring_buffer_unregister(struct iio_ring_buffer *ring)
-{
- __iio_ring_attr_cleanup(ring);
- __iio_free_ring_buffer_chrdev(ring);
-}
-EXPORT_SYMBOL(iio_ring_buffer_unregister);
-
-ssize_t iio_read_ring_length(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-
- if (ring->access->get_length)
- return sprintf(buf, "%d\n",
- ring->access->get_length(ring));
-
- return 0;
-}
-EXPORT_SYMBOL(iio_read_ring_length);
-
-ssize_t iio_write_ring_length(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret;
- ulong val;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-
- ret = strict_strtoul(buf, 10, &val);
- if (ret)
- return ret;
-
- if (ring->access->get_length)
- if (val == ring->access->get_length(ring))
- return len;
-
- if (ring->access->set_length) {
- ring->access->set_length(ring, val);
- if (ring->access->mark_param_change)
- ring->access->mark_param_change(ring);
- }
-
- return len;
-}
-EXPORT_SYMBOL(iio_write_ring_length);
-
-ssize_t iio_read_ring_bytes_per_datum(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-
- if (ring->access->get_bytes_per_datum)
- return sprintf(buf, "%d\n",
- ring->access->get_bytes_per_datum(ring));
-
- return 0;
-}
-EXPORT_SYMBOL(iio_read_ring_bytes_per_datum);
-
-ssize_t iio_store_ring_enable(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret;
- bool requested_state, current_state;
- int previous_mode;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- struct iio_dev *dev_info = ring->indio_dev;
-
- mutex_lock(&dev_info->mlock);
- previous_mode = dev_info->currentmode;
- requested_state = !(buf[0] == '0');
- current_state = !!(previous_mode & INDIO_ALL_RING_MODES);
- if (current_state == requested_state) {
- printk(KERN_INFO "iio-ring, current state requested again\n");
- goto done;
- }
- if (requested_state) {
- if (ring->setup_ops->preenable) {
- ret = ring->setup_ops->preenable(dev_info);
- if (ret) {
- printk(KERN_ERR
- "Buffer not started:"
- "ring preenable failed\n");
- goto error_ret;
- }
- }
- if (ring->access->request_update) {
- ret = ring->access->request_update(ring);
- if (ret) {
- printk(KERN_INFO
- "Buffer not started:"
- "ring parameter update failed\n");
- goto error_ret;
- }
- }
- if (ring->access->mark_in_use)
- ring->access->mark_in_use(ring);
- /* Definitely possible for devices to support both of these.*/
- if (dev_info->modes & INDIO_RING_TRIGGERED) {
- if (!dev_info->trig) {
- printk(KERN_INFO
- "Buffer not started: no trigger\n");
- ret = -EINVAL;
- if (ring->access->unmark_in_use)
- ring->access->unmark_in_use(ring);
- goto error_ret;
- }
- dev_info->currentmode = INDIO_RING_TRIGGERED;
- } else if (dev_info->modes & INDIO_RING_HARDWARE_BUFFER)
- dev_info->currentmode = INDIO_RING_HARDWARE_BUFFER;
- else { /* should never be reached */
- ret = -EINVAL;
- goto error_ret;
- }
-
- if (ring->setup_ops->postenable) {
- ret = ring->setup_ops->postenable(dev_info);
- if (ret) {
- printk(KERN_INFO
- "Buffer not started:"
- "postenable failed\n");
- if (ring->access->unmark_in_use)
- ring->access->unmark_in_use(ring);
- dev_info->currentmode = previous_mode;
- if (ring->setup_ops->postdisable)
- ring->setup_ops->postdisable(dev_info);
- goto error_ret;
- }
- }
- } else {
- if (ring->setup_ops->predisable) {
- ret = ring->setup_ops->predisable(dev_info);
- if (ret)
- goto error_ret;
- }
- if (ring->access->unmark_in_use)
- ring->access->unmark_in_use(ring);
- dev_info->currentmode = INDIO_DIRECT_MODE;
- if (ring->setup_ops->postdisable) {
- ret = ring->setup_ops->postdisable(dev_info);
- if (ret)
- goto error_ret;
- }
- }
-done:
- mutex_unlock(&dev_info->mlock);
- return len;
-
-error_ret:
- mutex_unlock(&dev_info->mlock);
- return ret;
-}
-EXPORT_SYMBOL(iio_store_ring_enable);
-
-ssize_t iio_show_ring_enable(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", !!(ring->indio_dev->currentmode
- & INDIO_ALL_RING_MODES));
-}
-EXPORT_SYMBOL(iio_show_ring_enable);
-
-int iio_sw_ring_preenable(struct iio_dev *indio_dev)
-{
- struct iio_ring_buffer *ring = indio_dev->ring;
- size_t size;
- dev_dbg(&indio_dev->dev, "%s\n", __func__);
- /* Check if there are any scan elements enabled, if not fail*/
- if (!(ring->scan_count || ring->scan_timestamp))
- return -EINVAL;
- if (ring->scan_timestamp)
- if (ring->scan_count)
- /* Timestamp (aligned to s64) and data */
- size = (((ring->scan_count * ring->bpe)
- + sizeof(s64) - 1)
- & ~(sizeof(s64) - 1))
- + sizeof(s64);
- else /* Timestamp only */
- size = sizeof(s64);
- else /* Data only */
- size = ring->scan_count * ring->bpe;
- ring->access->set_bytes_per_datum(ring, size);
-
- return 0;
-}
-EXPORT_SYMBOL(iio_sw_ring_preenable);
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