diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/iio/industrialio-buffer.c | 1999 |
1 files changed, 1999 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c new file mode 100644 index 000000000..7e7ee307a --- /dev/null +++ b/drivers/iio/industrialio-buffer.c @@ -0,0 +1,1999 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* The industrial I/O core + * + * Copyright (c) 2008 Jonathan Cameron + * + * Handling of buffer allocation / resizing. + * + * Things to look at here. + * - Better memory allocation techniques? + * - Alternative access techniques? + */ +#include <linux/anon_inodes.h> +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/device.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/cdev.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/sched/signal.h> + +#include <linux/iio/iio.h> +#include <linux/iio/iio-opaque.h> +#include "iio_core.h" +#include "iio_core_trigger.h" +#include <linux/iio/sysfs.h> +#include <linux/iio/buffer.h> +#include <linux/iio/buffer_impl.h> + +static const char * const iio_endian_prefix[] = { + [IIO_BE] = "be", + [IIO_LE] = "le", +}; + +static bool iio_buffer_is_active(struct iio_buffer *buf) +{ + return !list_empty(&buf->buffer_list); +} + +static size_t iio_buffer_data_available(struct iio_buffer *buf) +{ + return buf->access->data_available(buf); +} + +static int iio_buffer_flush_hwfifo(struct iio_dev *indio_dev, + struct iio_buffer *buf, size_t required) +{ + if (!indio_dev->info->hwfifo_flush_to_buffer) + return -ENODEV; + + return indio_dev->info->hwfifo_flush_to_buffer(indio_dev, required); +} + +static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf, + size_t to_wait, int to_flush) +{ + size_t avail; + int flushed = 0; + + /* wakeup if the device was unregistered */ + if (!indio_dev->info) + return true; + + /* drain the buffer if it was disabled */ + if (!iio_buffer_is_active(buf)) { + to_wait = min_t(size_t, to_wait, 1); + to_flush = 0; + } + + avail = iio_buffer_data_available(buf); + + if (avail >= to_wait) { + /* force a flush for non-blocking reads */ + if (!to_wait && avail < to_flush) + iio_buffer_flush_hwfifo(indio_dev, buf, + to_flush - avail); + return true; + } + + if (to_flush) + flushed = iio_buffer_flush_hwfifo(indio_dev, buf, + to_wait - avail); + if (flushed <= 0) + return false; + + if (avail + flushed >= to_wait) + return true; + + return false; +} + +/** + * iio_buffer_read() - chrdev read for buffer access + * @filp: File structure pointer for the char device + * @buf: Destination buffer for iio buffer read + * @n: First n bytes to read + * @f_ps: Long offset provided by the user as a seek position + * + * This function relies on all buffer implementations having an + * iio_buffer as their first element. + * + * Return: negative values corresponding to error codes or ret != 0 + * for ending the reading activity + **/ +static ssize_t iio_buffer_read(struct file *filp, char __user *buf, + size_t n, loff_t *f_ps) +{ + struct iio_dev_buffer_pair *ib = filp->private_data; + struct iio_buffer *rb = ib->buffer; + struct iio_dev *indio_dev = ib->indio_dev; + DEFINE_WAIT_FUNC(wait, woken_wake_function); + size_t datum_size; + size_t to_wait; + int ret = 0; + + if (!indio_dev->info) + return -ENODEV; + + if (!rb || !rb->access->read) + return -EINVAL; + + if (rb->direction != IIO_BUFFER_DIRECTION_IN) + return -EPERM; + + datum_size = rb->bytes_per_datum; + + /* + * If datum_size is 0 there will never be anything to read from the + * buffer, so signal end of file now. + */ + if (!datum_size) + return 0; + + if (filp->f_flags & O_NONBLOCK) + to_wait = 0; + else + to_wait = min_t(size_t, n / datum_size, rb->watermark); + + add_wait_queue(&rb->pollq, &wait); + do { + if (!indio_dev->info) { + ret = -ENODEV; + break; + } + + if (!iio_buffer_ready(indio_dev, rb, to_wait, n / datum_size)) { + if (signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + + wait_woken(&wait, TASK_INTERRUPTIBLE, + MAX_SCHEDULE_TIMEOUT); + continue; + } + + ret = rb->access->read(rb, n, buf); + if (ret == 0 && (filp->f_flags & O_NONBLOCK)) + ret = -EAGAIN; + } while (ret == 0); + remove_wait_queue(&rb->pollq, &wait); + + return ret; +} + +static size_t iio_buffer_space_available(struct iio_buffer *buf) +{ + if (buf->access->space_available) + return buf->access->space_available(buf); + + return SIZE_MAX; +} + +static ssize_t iio_buffer_write(struct file *filp, const char __user *buf, + size_t n, loff_t *f_ps) +{ + struct iio_dev_buffer_pair *ib = filp->private_data; + struct iio_buffer *rb = ib->buffer; + struct iio_dev *indio_dev = ib->indio_dev; + DEFINE_WAIT_FUNC(wait, woken_wake_function); + int ret = 0; + size_t written; + + if (!indio_dev->info) + return -ENODEV; + + if (!rb || !rb->access->write) + return -EINVAL; + + if (rb->direction != IIO_BUFFER_DIRECTION_OUT) + return -EPERM; + + written = 0; + add_wait_queue(&rb->pollq, &wait); + do { + if (indio_dev->info == NULL) + return -ENODEV; + + if (!iio_buffer_space_available(rb)) { + if (signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + + if (filp->f_flags & O_NONBLOCK) { + if (!written) + ret = -EAGAIN; + break; + } + + wait_woken(&wait, TASK_INTERRUPTIBLE, + MAX_SCHEDULE_TIMEOUT); + continue; + } + + ret = rb->access->write(rb, n - written, buf + written); + if (ret < 0) + break; + + written += ret; + + } while (written != n); + remove_wait_queue(&rb->pollq, &wait); + + return ret < 0 ? ret : written; +} + +/** + * iio_buffer_poll() - poll the buffer to find out if it has data + * @filp: File structure pointer for device access + * @wait: Poll table structure pointer for which the driver adds + * a wait queue + * + * Return: (EPOLLIN | EPOLLRDNORM) if data is available for reading + * or 0 for other cases + */ +static __poll_t iio_buffer_poll(struct file *filp, + struct poll_table_struct *wait) +{ + struct iio_dev_buffer_pair *ib = filp->private_data; + struct iio_buffer *rb = ib->buffer; + struct iio_dev *indio_dev = ib->indio_dev; + + if (!indio_dev->info || rb == NULL) + return 0; + + poll_wait(filp, &rb->pollq, wait); + + switch (rb->direction) { + case IIO_BUFFER_DIRECTION_IN: + if (iio_buffer_ready(indio_dev, rb, rb->watermark, 0)) + return EPOLLIN | EPOLLRDNORM; + break; + case IIO_BUFFER_DIRECTION_OUT: + if (iio_buffer_space_available(rb)) + return EPOLLOUT | EPOLLWRNORM; + break; + } + + return 0; +} + +ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf, + size_t n, loff_t *f_ps) +{ + struct iio_dev_buffer_pair *ib = filp->private_data; + struct iio_buffer *rb = ib->buffer; + + /* check if buffer was opened through new API */ + if (test_bit(IIO_BUSY_BIT_POS, &rb->flags)) + return -EBUSY; + + return iio_buffer_read(filp, buf, n, f_ps); +} + +ssize_t iio_buffer_write_wrapper(struct file *filp, const char __user *buf, + size_t n, loff_t *f_ps) +{ + struct iio_dev_buffer_pair *ib = filp->private_data; + struct iio_buffer *rb = ib->buffer; + + /* check if buffer was opened through new API */ + if (test_bit(IIO_BUSY_BIT_POS, &rb->flags)) + return -EBUSY; + + return iio_buffer_write(filp, buf, n, f_ps); +} + +__poll_t iio_buffer_poll_wrapper(struct file *filp, + struct poll_table_struct *wait) +{ + struct iio_dev_buffer_pair *ib = filp->private_data; + struct iio_buffer *rb = ib->buffer; + + /* check if buffer was opened through new API */ + if (test_bit(IIO_BUSY_BIT_POS, &rb->flags)) + return 0; + + return iio_buffer_poll(filp, wait); +} + +/** + * iio_buffer_wakeup_poll - Wakes up the buffer waitqueue + * @indio_dev: The IIO device + * + * Wakes up the event waitqueue used for poll(). Should usually + * be called when the device is unregistered. + */ +void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer *buffer; + unsigned int i; + + for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) { + buffer = iio_dev_opaque->attached_buffers[i]; + wake_up(&buffer->pollq); + } +} + +int iio_pop_from_buffer(struct iio_buffer *buffer, void *data) +{ + if (!buffer || !buffer->access || !buffer->access->remove_from) + return -EINVAL; + + return buffer->access->remove_from(buffer, data); +} +EXPORT_SYMBOL_GPL(iio_pop_from_buffer); + +void iio_buffer_init(struct iio_buffer *buffer) +{ + INIT_LIST_HEAD(&buffer->demux_list); + INIT_LIST_HEAD(&buffer->buffer_list); + init_waitqueue_head(&buffer->pollq); + kref_init(&buffer->ref); + if (!buffer->watermark) + buffer->watermark = 1; +} +EXPORT_SYMBOL(iio_buffer_init); + +void iio_device_detach_buffers(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer *buffer; + unsigned int i; + + for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) { + buffer = iio_dev_opaque->attached_buffers[i]; + iio_buffer_put(buffer); + } + + kfree(iio_dev_opaque->attached_buffers); +} + +static ssize_t iio_show_scan_index(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sysfs_emit(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); + u8 type = this_attr->c->scan_type.endianness; + + if (type == IIO_CPU) { +#ifdef __LITTLE_ENDIAN + type = IIO_LE; +#else + type = IIO_BE; +#endif + } + if (this_attr->c->scan_type.repeat > 1) + return sysfs_emit(buf, "%s:%c%d/%dX%d>>%u\n", + iio_endian_prefix[type], + this_attr->c->scan_type.sign, + this_attr->c->scan_type.realbits, + this_attr->c->scan_type.storagebits, + this_attr->c->scan_type.repeat, + this_attr->c->scan_type.shift); + else + return sysfs_emit(buf, "%s:%c%d/%d>>%u\n", + iio_endian_prefix[type], + 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_buffer *buffer = to_iio_dev_attr(attr)->buffer; + + /* Ensure ret is 0 or 1. */ + ret = !!test_bit(to_iio_dev_attr(attr)->address, + buffer->scan_mask); + + return sysfs_emit(buf, "%d\n", ret); +} + +/* Note NULL used as error indicator as it doesn't make sense. */ +static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, + unsigned int masklength, + const unsigned long *mask, + bool strict) +{ + if (bitmap_empty(mask, masklength)) + return NULL; + while (*av_masks) { + if (strict) { + if (bitmap_equal(mask, av_masks, masklength)) + return av_masks; + } else { + if (bitmap_subset(mask, av_masks, masklength)) + return av_masks; + } + av_masks += BITS_TO_LONGS(masklength); + } + return NULL; +} + +static bool iio_validate_scan_mask(struct iio_dev *indio_dev, + const unsigned long *mask) +{ + if (!indio_dev->setup_ops->validate_scan_mask) + return true; + + return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); +} + +/** + * iio_scan_mask_set() - set particular bit in the scan mask + * @indio_dev: the iio device + * @buffer: the buffer whose scan mask we are interested in + * @bit: the bit to be set. + * + * Note that at this point we have no way of knowing what other + * buffers might request, hence this code only verifies that the + * individual buffers request is plausible. + */ +static int iio_scan_mask_set(struct iio_dev *indio_dev, + struct iio_buffer *buffer, int bit) +{ + const unsigned long *mask; + unsigned long *trialmask; + + if (!indio_dev->masklength) { + WARN(1, "Trying to set scanmask prior to registering buffer\n"); + return -EINVAL; + } + + trialmask = bitmap_alloc(indio_dev->masklength, GFP_KERNEL); + if (!trialmask) + return -ENOMEM; + bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); + set_bit(bit, trialmask); + + if (!iio_validate_scan_mask(indio_dev, trialmask)) + goto err_invalid_mask; + + if (indio_dev->available_scan_masks) { + mask = iio_scan_mask_match(indio_dev->available_scan_masks, + indio_dev->masklength, + trialmask, false); + if (!mask) + goto err_invalid_mask; + } + bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); + + bitmap_free(trialmask); + + return 0; + +err_invalid_mask: + bitmap_free(trialmask); + return -EINVAL; +} + +static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) +{ + clear_bit(bit, buffer->scan_mask); + return 0; +} + +static int iio_scan_mask_query(struct iio_dev *indio_dev, + struct iio_buffer *buffer, int bit) +{ + if (bit > indio_dev->masklength) + return -EINVAL; + + if (!buffer->scan_mask) + return 0; + + /* Ensure return value is 0 or 1. */ + return !!test_bit(bit, buffer->scan_mask); +}; + +static ssize_t iio_scan_el_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + int ret; + bool state; + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + struct iio_buffer *buffer = this_attr->buffer; + + ret = kstrtobool(buf, &state); + if (ret < 0) + return ret; + mutex_lock(&indio_dev->mlock); + if (iio_buffer_is_active(buffer)) { + ret = -EBUSY; + goto error_ret; + } + ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); + if (ret < 0) + goto error_ret; + if (!state && ret) { + ret = iio_scan_mask_clear(buffer, this_attr->address); + if (ret) + goto error_ret; + } else if (state && !ret) { + ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); + if (ret) + goto error_ret; + } + +error_ret: + mutex_unlock(&indio_dev->mlock); + + return ret < 0 ? ret : len; + +} + +static ssize_t iio_scan_el_ts_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + + return sysfs_emit(buf, "%d\n", buffer->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; + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + bool state; + + ret = kstrtobool(buf, &state); + if (ret < 0) + return ret; + + mutex_lock(&indio_dev->mlock); + if (iio_buffer_is_active(buffer)) { + ret = -EBUSY; + goto error_ret; + } + buffer->scan_timestamp = state; +error_ret: + mutex_unlock(&indio_dev->mlock); + + return ret ? ret : len; +} + +static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, + struct iio_buffer *buffer, + const struct iio_chan_spec *chan) +{ + int ret, attrcount = 0; + + ret = __iio_add_chan_devattr("index", + chan, + &iio_show_scan_index, + NULL, + 0, + IIO_SEPARATE, + &indio_dev->dev, + buffer, + &buffer->buffer_attr_list); + if (ret) + return ret; + attrcount++; + ret = __iio_add_chan_devattr("type", + chan, + &iio_show_fixed_type, + NULL, + 0, + 0, + &indio_dev->dev, + buffer, + &buffer->buffer_attr_list); + if (ret) + return ret; + attrcount++; + if (chan->type != IIO_TIMESTAMP) + ret = __iio_add_chan_devattr("en", + chan, + &iio_scan_el_show, + &iio_scan_el_store, + chan->scan_index, + 0, + &indio_dev->dev, + buffer, + &buffer->buffer_attr_list); + else + ret = __iio_add_chan_devattr("en", + chan, + &iio_scan_el_ts_show, + &iio_scan_el_ts_store, + chan->scan_index, + 0, + &indio_dev->dev, + buffer, + &buffer->buffer_attr_list); + if (ret) + return ret; + attrcount++; + ret = attrcount; + return ret; +} + +static ssize_t length_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + + return sysfs_emit(buf, "%d\n", buffer->length); +} + +static ssize_t length_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + unsigned int val; + int ret; + + ret = kstrtouint(buf, 10, &val); + if (ret) + return ret; + + if (val == buffer->length) + return len; + + mutex_lock(&indio_dev->mlock); + if (iio_buffer_is_active(buffer)) { + ret = -EBUSY; + } else { + buffer->access->set_length(buffer, val); + ret = 0; + } + if (ret) + goto out; + if (buffer->length && buffer->length < buffer->watermark) + buffer->watermark = buffer->length; +out: + mutex_unlock(&indio_dev->mlock); + + return ret ? ret : len; +} + +static ssize_t enable_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + + return sysfs_emit(buf, "%d\n", iio_buffer_is_active(buffer)); +} + +static unsigned int iio_storage_bytes_for_si(struct iio_dev *indio_dev, + unsigned int scan_index) +{ + const struct iio_chan_spec *ch; + unsigned int bytes; + + ch = iio_find_channel_from_si(indio_dev, scan_index); + bytes = ch->scan_type.storagebits / 8; + if (ch->scan_type.repeat > 1) + bytes *= ch->scan_type.repeat; + return bytes; +} + +static unsigned int iio_storage_bytes_for_timestamp(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + + return iio_storage_bytes_for_si(indio_dev, + iio_dev_opaque->scan_index_timestamp); +} + +static int iio_compute_scan_bytes(struct iio_dev *indio_dev, + const unsigned long *mask, bool timestamp) +{ + unsigned int bytes = 0; + int length, i, largest = 0; + + /* How much space will the demuxed element take? */ + for_each_set_bit(i, mask, + indio_dev->masklength) { + length = iio_storage_bytes_for_si(indio_dev, i); + bytes = ALIGN(bytes, length); + bytes += length; + largest = max(largest, length); + } + + if (timestamp) { + length = iio_storage_bytes_for_timestamp(indio_dev); + bytes = ALIGN(bytes, length); + bytes += length; + largest = max(largest, length); + } + + bytes = ALIGN(bytes, largest); + return bytes; +} + +static void iio_buffer_activate(struct iio_dev *indio_dev, + struct iio_buffer *buffer) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + + iio_buffer_get(buffer); + list_add(&buffer->buffer_list, &iio_dev_opaque->buffer_list); +} + +static void iio_buffer_deactivate(struct iio_buffer *buffer) +{ + list_del_init(&buffer->buffer_list); + wake_up_interruptible(&buffer->pollq); + iio_buffer_put(buffer); +} + +static void iio_buffer_deactivate_all(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer *buffer, *_buffer; + + list_for_each_entry_safe(buffer, _buffer, + &iio_dev_opaque->buffer_list, buffer_list) + iio_buffer_deactivate(buffer); +} + +static int iio_buffer_enable(struct iio_buffer *buffer, + struct iio_dev *indio_dev) +{ + if (!buffer->access->enable) + return 0; + return buffer->access->enable(buffer, indio_dev); +} + +static int iio_buffer_disable(struct iio_buffer *buffer, + struct iio_dev *indio_dev) +{ + if (!buffer->access->disable) + return 0; + return buffer->access->disable(buffer, indio_dev); +} + +static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev, + struct iio_buffer *buffer) +{ + unsigned int bytes; + + if (!buffer->access->set_bytes_per_datum) + return; + + bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask, + buffer->scan_timestamp); + + buffer->access->set_bytes_per_datum(buffer, bytes); +} + +static int iio_buffer_request_update(struct iio_dev *indio_dev, + struct iio_buffer *buffer) +{ + int ret; + + iio_buffer_update_bytes_per_datum(indio_dev, buffer); + if (buffer->access->request_update) { + ret = buffer->access->request_update(buffer); + if (ret) { + dev_dbg(&indio_dev->dev, + "Buffer not started: buffer parameter update failed (%d)\n", + ret); + return ret; + } + } + + return 0; +} + +static void iio_free_scan_mask(struct iio_dev *indio_dev, + const unsigned long *mask) +{ + /* If the mask is dynamically allocated free it, otherwise do nothing */ + if (!indio_dev->available_scan_masks) + bitmap_free(mask); +} + +struct iio_device_config { + unsigned int mode; + unsigned int watermark; + const unsigned long *scan_mask; + unsigned int scan_bytes; + bool scan_timestamp; +}; + +static int iio_verify_update(struct iio_dev *indio_dev, + struct iio_buffer *insert_buffer, struct iio_buffer *remove_buffer, + struct iio_device_config *config) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + unsigned long *compound_mask; + const unsigned long *scan_mask; + bool strict_scanmask = false; + struct iio_buffer *buffer; + bool scan_timestamp; + unsigned int modes; + + if (insert_buffer && + bitmap_empty(insert_buffer->scan_mask, indio_dev->masklength)) { + dev_dbg(&indio_dev->dev, + "At least one scan element must be enabled first\n"); + return -EINVAL; + } + + memset(config, 0, sizeof(*config)); + config->watermark = ~0; + + /* + * If there is just one buffer and we are removing it there is nothing + * to verify. + */ + if (remove_buffer && !insert_buffer && + list_is_singular(&iio_dev_opaque->buffer_list)) + return 0; + + modes = indio_dev->modes; + + list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) { + if (buffer == remove_buffer) + continue; + modes &= buffer->access->modes; + config->watermark = min(config->watermark, buffer->watermark); + } + + if (insert_buffer) { + modes &= insert_buffer->access->modes; + config->watermark = min(config->watermark, + insert_buffer->watermark); + } + + /* Definitely possible for devices to support both of these. */ + if ((modes & INDIO_BUFFER_TRIGGERED) && indio_dev->trig) { + config->mode = INDIO_BUFFER_TRIGGERED; + } else if (modes & INDIO_BUFFER_HARDWARE) { + /* + * Keep things simple for now and only allow a single buffer to + * be connected in hardware mode. + */ + if (insert_buffer && !list_empty(&iio_dev_opaque->buffer_list)) + return -EINVAL; + config->mode = INDIO_BUFFER_HARDWARE; + strict_scanmask = true; + } else if (modes & INDIO_BUFFER_SOFTWARE) { + config->mode = INDIO_BUFFER_SOFTWARE; + } else { + /* Can only occur on first buffer */ + if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) + dev_dbg(&indio_dev->dev, "Buffer not started: no trigger\n"); + return -EINVAL; + } + + /* What scan mask do we actually have? */ + compound_mask = bitmap_zalloc(indio_dev->masklength, GFP_KERNEL); + if (compound_mask == NULL) + return -ENOMEM; + + scan_timestamp = false; + + list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) { + if (buffer == remove_buffer) + continue; + bitmap_or(compound_mask, compound_mask, buffer->scan_mask, + indio_dev->masklength); + scan_timestamp |= buffer->scan_timestamp; + } + + if (insert_buffer) { + bitmap_or(compound_mask, compound_mask, + insert_buffer->scan_mask, indio_dev->masklength); + scan_timestamp |= insert_buffer->scan_timestamp; + } + + if (indio_dev->available_scan_masks) { + scan_mask = iio_scan_mask_match(indio_dev->available_scan_masks, + indio_dev->masklength, + compound_mask, + strict_scanmask); + bitmap_free(compound_mask); + if (scan_mask == NULL) + return -EINVAL; + } else { + scan_mask = compound_mask; + } + + config->scan_bytes = iio_compute_scan_bytes(indio_dev, + scan_mask, scan_timestamp); + config->scan_mask = scan_mask; + config->scan_timestamp = scan_timestamp; + + return 0; +} + +/** + * struct iio_demux_table - table describing demux memcpy ops + * @from: index to copy from + * @to: index to copy to + * @length: how many bytes to copy + * @l: list head used for management + */ +struct iio_demux_table { + unsigned int from; + unsigned int to; + unsigned int length; + struct list_head l; +}; + +static void iio_buffer_demux_free(struct iio_buffer *buffer) +{ + struct iio_demux_table *p, *q; + + list_for_each_entry_safe(p, q, &buffer->demux_list, l) { + list_del(&p->l); + kfree(p); + } +} + +static int iio_buffer_add_demux(struct iio_buffer *buffer, + struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc, + unsigned int length) +{ + + if (*p && (*p)->from + (*p)->length == in_loc && + (*p)->to + (*p)->length == out_loc) { + (*p)->length += length; + } else { + *p = kmalloc(sizeof(**p), GFP_KERNEL); + if (*p == NULL) + return -ENOMEM; + (*p)->from = in_loc; + (*p)->to = out_loc; + (*p)->length = length; + list_add_tail(&(*p)->l, &buffer->demux_list); + } + + return 0; +} + +static int iio_buffer_update_demux(struct iio_dev *indio_dev, + struct iio_buffer *buffer) +{ + int ret, in_ind = -1, out_ind, length; + unsigned int in_loc = 0, out_loc = 0; + struct iio_demux_table *p = NULL; + + /* Clear out any old demux */ + iio_buffer_demux_free(buffer); + kfree(buffer->demux_bounce); + buffer->demux_bounce = NULL; + + /* First work out which scan mode we will actually have */ + if (bitmap_equal(indio_dev->active_scan_mask, + buffer->scan_mask, + indio_dev->masklength)) + return 0; + + /* Now we have the two masks, work from least sig and build up sizes */ + for_each_set_bit(out_ind, + buffer->scan_mask, + indio_dev->masklength) { + in_ind = find_next_bit(indio_dev->active_scan_mask, + indio_dev->masklength, + in_ind + 1); + while (in_ind != out_ind) { + length = iio_storage_bytes_for_si(indio_dev, in_ind); + /* Make sure we are aligned */ + in_loc = roundup(in_loc, length) + length; + in_ind = find_next_bit(indio_dev->active_scan_mask, + indio_dev->masklength, + in_ind + 1); + } + length = iio_storage_bytes_for_si(indio_dev, in_ind); + out_loc = roundup(out_loc, length); + in_loc = roundup(in_loc, length); + ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); + if (ret) + goto error_clear_mux_table; + out_loc += length; + in_loc += length; + } + /* Relies on scan_timestamp being last */ + if (buffer->scan_timestamp) { + length = iio_storage_bytes_for_timestamp(indio_dev); + out_loc = roundup(out_loc, length); + in_loc = roundup(in_loc, length); + ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); + if (ret) + goto error_clear_mux_table; + out_loc += length; + } + buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); + if (buffer->demux_bounce == NULL) { + ret = -ENOMEM; + goto error_clear_mux_table; + } + return 0; + +error_clear_mux_table: + iio_buffer_demux_free(buffer); + + return ret; +} + +static int iio_update_demux(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer *buffer; + int ret; + + list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) { + ret = iio_buffer_update_demux(indio_dev, buffer); + if (ret < 0) + goto error_clear_mux_table; + } + return 0; + +error_clear_mux_table: + list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) + iio_buffer_demux_free(buffer); + + return ret; +} + +static int iio_enable_buffers(struct iio_dev *indio_dev, + struct iio_device_config *config) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer *buffer, *tmp = NULL; + int ret; + + indio_dev->active_scan_mask = config->scan_mask; + indio_dev->scan_timestamp = config->scan_timestamp; + indio_dev->scan_bytes = config->scan_bytes; + iio_dev_opaque->currentmode = config->mode; + + iio_update_demux(indio_dev); + + /* Wind up again */ + if (indio_dev->setup_ops->preenable) { + ret = indio_dev->setup_ops->preenable(indio_dev); + if (ret) { + dev_dbg(&indio_dev->dev, + "Buffer not started: buffer preenable failed (%d)\n", ret); + goto err_undo_config; + } + } + + if (indio_dev->info->update_scan_mode) { + ret = indio_dev->info + ->update_scan_mode(indio_dev, + indio_dev->active_scan_mask); + if (ret < 0) { + dev_dbg(&indio_dev->dev, + "Buffer not started: update scan mode failed (%d)\n", + ret); + goto err_run_postdisable; + } + } + + if (indio_dev->info->hwfifo_set_watermark) + indio_dev->info->hwfifo_set_watermark(indio_dev, + config->watermark); + + list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) { + ret = iio_buffer_enable(buffer, indio_dev); + if (ret) { + tmp = buffer; + goto err_disable_buffers; + } + } + + if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) { + ret = iio_trigger_attach_poll_func(indio_dev->trig, + indio_dev->pollfunc); + if (ret) + goto err_disable_buffers; + } + + if (indio_dev->setup_ops->postenable) { + ret = indio_dev->setup_ops->postenable(indio_dev); + if (ret) { + dev_dbg(&indio_dev->dev, + "Buffer not started: postenable failed (%d)\n", ret); + goto err_detach_pollfunc; + } + } + + return 0; + +err_detach_pollfunc: + if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) { + iio_trigger_detach_poll_func(indio_dev->trig, + indio_dev->pollfunc); + } +err_disable_buffers: + buffer = list_prepare_entry(tmp, &iio_dev_opaque->buffer_list, buffer_list); + list_for_each_entry_continue_reverse(buffer, &iio_dev_opaque->buffer_list, + buffer_list) + iio_buffer_disable(buffer, indio_dev); +err_run_postdisable: + if (indio_dev->setup_ops->postdisable) + indio_dev->setup_ops->postdisable(indio_dev); +err_undo_config: + iio_dev_opaque->currentmode = INDIO_DIRECT_MODE; + indio_dev->active_scan_mask = NULL; + + return ret; +} + +static int iio_disable_buffers(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer *buffer; + int ret = 0; + int ret2; + + /* Wind down existing buffers - iff there are any */ + if (list_empty(&iio_dev_opaque->buffer_list)) + return 0; + + /* + * If things go wrong at some step in disable we still need to continue + * to perform the other steps, otherwise we leave the device in a + * inconsistent state. We return the error code for the first error we + * encountered. + */ + + if (indio_dev->setup_ops->predisable) { + ret2 = indio_dev->setup_ops->predisable(indio_dev); + if (ret2 && !ret) + ret = ret2; + } + + if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) { + iio_trigger_detach_poll_func(indio_dev->trig, + indio_dev->pollfunc); + } + + list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) { + ret2 = iio_buffer_disable(buffer, indio_dev); + if (ret2 && !ret) + ret = ret2; + } + + if (indio_dev->setup_ops->postdisable) { + ret2 = indio_dev->setup_ops->postdisable(indio_dev); + if (ret2 && !ret) + ret = ret2; + } + + iio_free_scan_mask(indio_dev, indio_dev->active_scan_mask); + indio_dev->active_scan_mask = NULL; + iio_dev_opaque->currentmode = INDIO_DIRECT_MODE; + + return ret; +} + +static int __iio_update_buffers(struct iio_dev *indio_dev, + struct iio_buffer *insert_buffer, + struct iio_buffer *remove_buffer) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_device_config new_config; + int ret; + + ret = iio_verify_update(indio_dev, insert_buffer, remove_buffer, + &new_config); + if (ret) + return ret; + + if (insert_buffer) { + ret = iio_buffer_request_update(indio_dev, insert_buffer); + if (ret) + goto err_free_config; + } + + ret = iio_disable_buffers(indio_dev); + if (ret) + goto err_deactivate_all; + + if (remove_buffer) + iio_buffer_deactivate(remove_buffer); + if (insert_buffer) + iio_buffer_activate(indio_dev, insert_buffer); + + /* If no buffers in list, we are done */ + if (list_empty(&iio_dev_opaque->buffer_list)) + return 0; + + ret = iio_enable_buffers(indio_dev, &new_config); + if (ret) + goto err_deactivate_all; + + return 0; + +err_deactivate_all: + /* + * We've already verified that the config is valid earlier. If things go + * wrong in either enable or disable the most likely reason is an IO + * error from the device. In this case there is no good recovery + * strategy. Just make sure to disable everything and leave the device + * in a sane state. With a bit of luck the device might come back to + * life again later and userspace can try again. + */ + iio_buffer_deactivate_all(indio_dev); + +err_free_config: + iio_free_scan_mask(indio_dev, new_config.scan_mask); + return ret; +} + +int iio_update_buffers(struct iio_dev *indio_dev, + struct iio_buffer *insert_buffer, + struct iio_buffer *remove_buffer) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + int ret; + + if (insert_buffer == remove_buffer) + return 0; + + if (insert_buffer && + (insert_buffer->direction == IIO_BUFFER_DIRECTION_OUT)) + return -EINVAL; + + mutex_lock(&iio_dev_opaque->info_exist_lock); + mutex_lock(&indio_dev->mlock); + + if (insert_buffer && iio_buffer_is_active(insert_buffer)) + insert_buffer = NULL; + + if (remove_buffer && !iio_buffer_is_active(remove_buffer)) + remove_buffer = NULL; + + if (!insert_buffer && !remove_buffer) { + ret = 0; + goto out_unlock; + } + + if (indio_dev->info == NULL) { + ret = -ENODEV; + goto out_unlock; + } + + ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer); + +out_unlock: + mutex_unlock(&indio_dev->mlock); + mutex_unlock(&iio_dev_opaque->info_exist_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(iio_update_buffers); + +void iio_disable_all_buffers(struct iio_dev *indio_dev) +{ + iio_disable_buffers(indio_dev); + iio_buffer_deactivate_all(indio_dev); +} + +static ssize_t enable_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + int ret; + bool requested_state; + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + bool inlist; + + ret = kstrtobool(buf, &requested_state); + if (ret < 0) + return ret; + + mutex_lock(&indio_dev->mlock); + + /* Find out if it is in the list */ + inlist = iio_buffer_is_active(buffer); + /* Already in desired state */ + if (inlist == requested_state) + goto done; + + if (requested_state) + ret = __iio_update_buffers(indio_dev, buffer, NULL); + else + ret = __iio_update_buffers(indio_dev, NULL, buffer); + +done: + mutex_unlock(&indio_dev->mlock); + return (ret < 0) ? ret : len; +} + +static ssize_t watermark_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + + return sysfs_emit(buf, "%u\n", buffer->watermark); +} + +static ssize_t watermark_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + unsigned int val; + int ret; + + ret = kstrtouint(buf, 10, &val); + if (ret) + return ret; + if (!val) + return -EINVAL; + + mutex_lock(&indio_dev->mlock); + + if (val > buffer->length) { + ret = -EINVAL; + goto out; + } + + if (iio_buffer_is_active(buffer)) { + ret = -EBUSY; + goto out; + } + + buffer->watermark = val; +out: + mutex_unlock(&indio_dev->mlock); + + return ret ? ret : len; +} + +static ssize_t data_available_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + + return sysfs_emit(buf, "%zu\n", iio_buffer_data_available(buffer)); +} + +static ssize_t direction_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer; + + switch (buffer->direction) { + case IIO_BUFFER_DIRECTION_IN: + return sysfs_emit(buf, "in\n"); + case IIO_BUFFER_DIRECTION_OUT: + return sysfs_emit(buf, "out\n"); + default: + return -EINVAL; + } +} + +static DEVICE_ATTR_RW(length); +static struct device_attribute dev_attr_length_ro = __ATTR_RO(length); +static DEVICE_ATTR_RW(enable); +static DEVICE_ATTR_RW(watermark); +static struct device_attribute dev_attr_watermark_ro = __ATTR_RO(watermark); +static DEVICE_ATTR_RO(data_available); +static DEVICE_ATTR_RO(direction); + +/* + * When adding new attributes here, put the at the end, at least until + * the code that handles the length/length_ro & watermark/watermark_ro + * assignments gets cleaned up. Otherwise these can create some weird + * duplicate attributes errors under some setups. + */ +static struct attribute *iio_buffer_attrs[] = { + &dev_attr_length.attr, + &dev_attr_enable.attr, + &dev_attr_watermark.attr, + &dev_attr_data_available.attr, + &dev_attr_direction.attr, +}; + +#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) + +static struct attribute *iio_buffer_wrap_attr(struct iio_buffer *buffer, + struct attribute *attr) +{ + struct device_attribute *dattr = to_dev_attr(attr); + struct iio_dev_attr *iio_attr; + + iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); + if (!iio_attr) + return NULL; + + iio_attr->buffer = buffer; + memcpy(&iio_attr->dev_attr, dattr, sizeof(iio_attr->dev_attr)); + iio_attr->dev_attr.attr.name = kstrdup_const(attr->name, GFP_KERNEL); + if (!iio_attr->dev_attr.attr.name) { + kfree(iio_attr); + return NULL; + } + + sysfs_attr_init(&iio_attr->dev_attr.attr); + + list_add(&iio_attr->l, &buffer->buffer_attr_list); + + return &iio_attr->dev_attr.attr; +} + +static int iio_buffer_register_legacy_sysfs_groups(struct iio_dev *indio_dev, + struct attribute **buffer_attrs, + int buffer_attrcount, + int scan_el_attrcount) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct attribute_group *group; + struct attribute **attrs; + int ret; + + attrs = kcalloc(buffer_attrcount + 1, sizeof(*attrs), GFP_KERNEL); + if (!attrs) + return -ENOMEM; + + memcpy(attrs, buffer_attrs, buffer_attrcount * sizeof(*attrs)); + + group = &iio_dev_opaque->legacy_buffer_group; + group->attrs = attrs; + group->name = "buffer"; + + ret = iio_device_register_sysfs_group(indio_dev, group); + if (ret) + goto error_free_buffer_attrs; + + attrs = kcalloc(scan_el_attrcount + 1, sizeof(*attrs), GFP_KERNEL); + if (!attrs) { + ret = -ENOMEM; + goto error_free_buffer_attrs; + } + + memcpy(attrs, &buffer_attrs[buffer_attrcount], + scan_el_attrcount * sizeof(*attrs)); + + group = &iio_dev_opaque->legacy_scan_el_group; + group->attrs = attrs; + group->name = "scan_elements"; + + ret = iio_device_register_sysfs_group(indio_dev, group); + if (ret) + goto error_free_scan_el_attrs; + + return 0; + +error_free_scan_el_attrs: + kfree(iio_dev_opaque->legacy_scan_el_group.attrs); +error_free_buffer_attrs: + kfree(iio_dev_opaque->legacy_buffer_group.attrs); + + return ret; +} + +static void iio_buffer_unregister_legacy_sysfs_groups(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + + kfree(iio_dev_opaque->legacy_buffer_group.attrs); + kfree(iio_dev_opaque->legacy_scan_el_group.attrs); +} + +static int iio_buffer_chrdev_release(struct inode *inode, struct file *filep) +{ + struct iio_dev_buffer_pair *ib = filep->private_data; + struct iio_dev *indio_dev = ib->indio_dev; + struct iio_buffer *buffer = ib->buffer; + + wake_up(&buffer->pollq); + + kfree(ib); + clear_bit(IIO_BUSY_BIT_POS, &buffer->flags); + iio_device_put(indio_dev); + + return 0; +} + +static const struct file_operations iio_buffer_chrdev_fileops = { + .owner = THIS_MODULE, + .llseek = noop_llseek, + .read = iio_buffer_read, + .write = iio_buffer_write, + .poll = iio_buffer_poll, + .release = iio_buffer_chrdev_release, +}; + +static long iio_device_buffer_getfd(struct iio_dev *indio_dev, unsigned long arg) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + int __user *ival = (int __user *)arg; + struct iio_dev_buffer_pair *ib; + struct iio_buffer *buffer; + int fd, idx, ret; + + if (copy_from_user(&idx, ival, sizeof(idx))) + return -EFAULT; + + if (idx >= iio_dev_opaque->attached_buffers_cnt) + return -ENODEV; + + iio_device_get(indio_dev); + + buffer = iio_dev_opaque->attached_buffers[idx]; + + if (test_and_set_bit(IIO_BUSY_BIT_POS, &buffer->flags)) { + ret = -EBUSY; + goto error_iio_dev_put; + } + + ib = kzalloc(sizeof(*ib), GFP_KERNEL); + if (!ib) { + ret = -ENOMEM; + goto error_clear_busy_bit; + } + + ib->indio_dev = indio_dev; + ib->buffer = buffer; + + fd = anon_inode_getfd("iio:buffer", &iio_buffer_chrdev_fileops, + ib, O_RDWR | O_CLOEXEC); + if (fd < 0) { + ret = fd; + goto error_free_ib; + } + + if (copy_to_user(ival, &fd, sizeof(fd))) { + /* + * "Leak" the fd, as there's not much we can do about this + * anyway. 'fd' might have been closed already, as + * anon_inode_getfd() called fd_install() on it, which made + * it reachable by userland. + * + * Instead of allowing a malicious user to play tricks with + * us, rely on the process exit path to do any necessary + * cleanup, as in releasing the file, if still needed. + */ + return -EFAULT; + } + + return 0; + +error_free_ib: + kfree(ib); +error_clear_busy_bit: + clear_bit(IIO_BUSY_BIT_POS, &buffer->flags); +error_iio_dev_put: + iio_device_put(indio_dev); + return ret; +} + +static long iio_device_buffer_ioctl(struct iio_dev *indio_dev, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case IIO_BUFFER_GET_FD_IOCTL: + return iio_device_buffer_getfd(indio_dev, arg); + default: + return IIO_IOCTL_UNHANDLED; + } +} + +static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer, + struct iio_dev *indio_dev, + int index) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_dev_attr *p; + struct attribute **attr; + int ret, i, attrn, scan_el_attrcount, buffer_attrcount; + const struct iio_chan_spec *channels; + + buffer_attrcount = 0; + if (buffer->attrs) { + while (buffer->attrs[buffer_attrcount] != NULL) + buffer_attrcount++; + } + + scan_el_attrcount = 0; + INIT_LIST_HEAD(&buffer->buffer_attr_list); + channels = indio_dev->channels; + if (channels) { + /* new magic */ + for (i = 0; i < indio_dev->num_channels; i++) { + if (channels[i].scan_index < 0) + continue; + + /* Verify that sample bits fit into storage */ + if (channels[i].scan_type.storagebits < + channels[i].scan_type.realbits + + channels[i].scan_type.shift) { + dev_err(&indio_dev->dev, + "Channel %d storagebits (%d) < shifted realbits (%d + %d)\n", + i, channels[i].scan_type.storagebits, + channels[i].scan_type.realbits, + channels[i].scan_type.shift); + ret = -EINVAL; + goto error_cleanup_dynamic; + } + + ret = iio_buffer_add_channel_sysfs(indio_dev, buffer, + &channels[i]); + if (ret < 0) + goto error_cleanup_dynamic; + scan_el_attrcount += ret; + if (channels[i].type == IIO_TIMESTAMP) + iio_dev_opaque->scan_index_timestamp = + channels[i].scan_index; + } + if (indio_dev->masklength && buffer->scan_mask == NULL) { + buffer->scan_mask = bitmap_zalloc(indio_dev->masklength, + GFP_KERNEL); + if (buffer->scan_mask == NULL) { + ret = -ENOMEM; + goto error_cleanup_dynamic; + } + } + } + + attrn = buffer_attrcount + scan_el_attrcount + ARRAY_SIZE(iio_buffer_attrs); + attr = kcalloc(attrn + 1, sizeof(*attr), GFP_KERNEL); + if (!attr) { + ret = -ENOMEM; + goto error_free_scan_mask; + } + + memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs)); + if (!buffer->access->set_length) + attr[0] = &dev_attr_length_ro.attr; + + if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK) + attr[2] = &dev_attr_watermark_ro.attr; + + if (buffer->attrs) + memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs, + sizeof(struct attribute *) * buffer_attrcount); + + buffer_attrcount += ARRAY_SIZE(iio_buffer_attrs); + buffer->buffer_group.attrs = attr; + + for (i = 0; i < buffer_attrcount; i++) { + struct attribute *wrapped; + + wrapped = iio_buffer_wrap_attr(buffer, attr[i]); + if (!wrapped) { + ret = -ENOMEM; + goto error_free_buffer_attrs; + } + attr[i] = wrapped; + } + + attrn = 0; + list_for_each_entry(p, &buffer->buffer_attr_list, l) + attr[attrn++] = &p->dev_attr.attr; + + buffer->buffer_group.name = kasprintf(GFP_KERNEL, "buffer%d", index); + if (!buffer->buffer_group.name) { + ret = -ENOMEM; + goto error_free_buffer_attrs; + } + + ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group); + if (ret) + goto error_free_buffer_attr_group_name; + + /* we only need to register the legacy groups for the first buffer */ + if (index > 0) + return 0; + + ret = iio_buffer_register_legacy_sysfs_groups(indio_dev, attr, + buffer_attrcount, + scan_el_attrcount); + if (ret) + goto error_free_buffer_attr_group_name; + + return 0; + +error_free_buffer_attr_group_name: + kfree(buffer->buffer_group.name); +error_free_buffer_attrs: + kfree(buffer->buffer_group.attrs); +error_free_scan_mask: + bitmap_free(buffer->scan_mask); +error_cleanup_dynamic: + iio_free_chan_devattr_list(&buffer->buffer_attr_list); + + return ret; +} + +static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer, + struct iio_dev *indio_dev, + int index) +{ + if (index == 0) + iio_buffer_unregister_legacy_sysfs_groups(indio_dev); + bitmap_free(buffer->scan_mask); + kfree(buffer->buffer_group.name); + kfree(buffer->buffer_group.attrs); + iio_free_chan_devattr_list(&buffer->buffer_attr_list); +} + +int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + const struct iio_chan_spec *channels; + struct iio_buffer *buffer; + int ret, i, idx; + size_t sz; + + channels = indio_dev->channels; + if (channels) { + int ml = indio_dev->masklength; + + for (i = 0; i < indio_dev->num_channels; i++) + ml = max(ml, channels[i].scan_index + 1); + indio_dev->masklength = ml; + } + + if (!iio_dev_opaque->attached_buffers_cnt) + return 0; + + for (idx = 0; idx < iio_dev_opaque->attached_buffers_cnt; idx++) { + buffer = iio_dev_opaque->attached_buffers[idx]; + ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, idx); + if (ret) + goto error_unwind_sysfs_and_mask; + } + + sz = sizeof(*(iio_dev_opaque->buffer_ioctl_handler)); + iio_dev_opaque->buffer_ioctl_handler = kzalloc(sz, GFP_KERNEL); + if (!iio_dev_opaque->buffer_ioctl_handler) { + ret = -ENOMEM; + goto error_unwind_sysfs_and_mask; + } + + iio_dev_opaque->buffer_ioctl_handler->ioctl = iio_device_buffer_ioctl; + iio_device_ioctl_handler_register(indio_dev, + iio_dev_opaque->buffer_ioctl_handler); + + return 0; + +error_unwind_sysfs_and_mask: + while (idx--) { + buffer = iio_dev_opaque->attached_buffers[idx]; + __iio_buffer_free_sysfs_and_mask(buffer, indio_dev, idx); + } + return ret; +} + +void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer *buffer; + int i; + + if (!iio_dev_opaque->attached_buffers_cnt) + return; + + iio_device_ioctl_handler_unregister(iio_dev_opaque->buffer_ioctl_handler); + kfree(iio_dev_opaque->buffer_ioctl_handler); + + for (i = iio_dev_opaque->attached_buffers_cnt - 1; i >= 0; i--) { + buffer = iio_dev_opaque->attached_buffers[i]; + __iio_buffer_free_sysfs_and_mask(buffer, indio_dev, i); + } +} + +/** + * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected + * @indio_dev: the iio device + * @mask: scan mask to be checked + * + * Return true if exactly one bit is set in the scan mask, false otherwise. It + * can be used for devices where only one channel can be active for sampling at + * a time. + */ +bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, + const unsigned long *mask) +{ + return bitmap_weight(mask, indio_dev->masklength) == 1; +} +EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); + +static const void *iio_demux(struct iio_buffer *buffer, + const void *datain) +{ + struct iio_demux_table *t; + + if (list_empty(&buffer->demux_list)) + return datain; + list_for_each_entry(t, &buffer->demux_list, l) + memcpy(buffer->demux_bounce + t->to, + datain + t->from, t->length); + + return buffer->demux_bounce; +} + +static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data) +{ + const void *dataout = iio_demux(buffer, data); + int ret; + + ret = buffer->access->store_to(buffer, dataout); + if (ret) + return ret; + + /* + * We can't just test for watermark to decide if we wake the poll queue + * because read may request less samples than the watermark. + */ + wake_up_interruptible_poll(&buffer->pollq, EPOLLIN | EPOLLRDNORM); + return 0; +} + +/** + * 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) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + int ret; + struct iio_buffer *buf; + + list_for_each_entry(buf, &iio_dev_opaque->buffer_list, buffer_list) { + ret = iio_push_to_buffer(buf, data); + if (ret < 0) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(iio_push_to_buffers); + +/** + * iio_push_to_buffers_with_ts_unaligned() - push to registered buffer, + * no alignment or space requirements. + * @indio_dev: iio_dev structure for device. + * @data: channel data excluding the timestamp. + * @data_sz: size of data. + * @timestamp: timestamp for the sample data. + * + * This special variant of iio_push_to_buffers_with_timestamp() does + * not require space for the timestamp, or 8 byte alignment of data. + * It does however require an allocation on first call and additional + * copies on all calls, so should be avoided if possible. + */ +int iio_push_to_buffers_with_ts_unaligned(struct iio_dev *indio_dev, + const void *data, + size_t data_sz, + int64_t timestamp) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + + /* + * Conservative estimate - we can always safely copy the minimum + * of either the data provided or the length of the destination buffer. + * This relaxed limit allows the calling drivers to be lax about + * tracking the size of the data they are pushing, at the cost of + * unnecessary copying of padding. + */ + data_sz = min_t(size_t, indio_dev->scan_bytes, data_sz); + if (iio_dev_opaque->bounce_buffer_size != indio_dev->scan_bytes) { + void *bb; + + bb = devm_krealloc(&indio_dev->dev, + iio_dev_opaque->bounce_buffer, + indio_dev->scan_bytes, GFP_KERNEL); + if (!bb) + return -ENOMEM; + iio_dev_opaque->bounce_buffer = bb; + iio_dev_opaque->bounce_buffer_size = indio_dev->scan_bytes; + } + memcpy(iio_dev_opaque->bounce_buffer, data, data_sz); + return iio_push_to_buffers_with_timestamp(indio_dev, + iio_dev_opaque->bounce_buffer, + timestamp); +} +EXPORT_SYMBOL_GPL(iio_push_to_buffers_with_ts_unaligned); + +/** + * iio_buffer_release() - Free a buffer's resources + * @ref: Pointer to the kref embedded in the iio_buffer struct + * + * This function is called when the last reference to the buffer has been + * dropped. It will typically free all resources allocated by the buffer. Do not + * call this function manually, always use iio_buffer_put() when done using a + * buffer. + */ +static void iio_buffer_release(struct kref *ref) +{ + struct iio_buffer *buffer = container_of(ref, struct iio_buffer, ref); + + buffer->access->release(buffer); +} + +/** + * iio_buffer_get() - Grab a reference to the buffer + * @buffer: The buffer to grab a reference for, may be NULL + * + * Returns the pointer to the buffer that was passed into the function. + */ +struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer) +{ + if (buffer) + kref_get(&buffer->ref); + + return buffer; +} +EXPORT_SYMBOL_GPL(iio_buffer_get); + +/** + * iio_buffer_put() - Release the reference to the buffer + * @buffer: The buffer to release the reference for, may be NULL + */ +void iio_buffer_put(struct iio_buffer *buffer) +{ + if (buffer) + kref_put(&buffer->ref, iio_buffer_release); +} +EXPORT_SYMBOL_GPL(iio_buffer_put); + +/** + * 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 + * + * Return 0 if successful, negative if error. + * + * This function attaches a buffer to a IIO device. The buffer stays attached to + * the device until the device is freed. For legacy reasons, the first attached + * buffer will also be assigned to 'indio_dev->buffer'. + * The array allocated here, will be free'd via the iio_device_detach_buffers() + * call which is handled by the iio_device_free(). + */ +int iio_device_attach_buffer(struct iio_dev *indio_dev, + struct iio_buffer *buffer) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer **new, **old = iio_dev_opaque->attached_buffers; + unsigned int cnt = iio_dev_opaque->attached_buffers_cnt; + + cnt++; + + new = krealloc(old, sizeof(*new) * cnt, GFP_KERNEL); + if (!new) + return -ENOMEM; + iio_dev_opaque->attached_buffers = new; + + buffer = iio_buffer_get(buffer); + + /* first buffer is legacy; attach it to the IIO device directly */ + if (!indio_dev->buffer) + indio_dev->buffer = buffer; + + iio_dev_opaque->attached_buffers[cnt - 1] = buffer; + iio_dev_opaque->attached_buffers_cnt = cnt; + + return 0; +} +EXPORT_SYMBOL_GPL(iio_device_attach_buffer); |