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130 lines
3.6 KiB
130 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2012 Analog Devices, Inc. |
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* Author: Lars-Peter Clausen <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/module.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/buffer_impl.h> |
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#include <linux/iio/kfifo_buf.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/iio/trigger_consumer.h> |
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/** |
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* iio_triggered_buffer_setup_ext() - Setup triggered buffer and pollfunc |
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* @indio_dev: IIO device structure |
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* @h: Function which will be used as pollfunc top half |
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* @thread: Function which will be used as pollfunc bottom half |
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* @setup_ops: Buffer setup functions to use for this device. |
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* If NULL the default setup functions for triggered |
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* buffers will be used. |
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* @buffer_attrs: Extra sysfs buffer attributes for this IIO buffer |
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* |
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* This function combines some common tasks which will normally be performed |
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* when setting up a triggered buffer. It will allocate the buffer and the |
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* pollfunc. |
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* |
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* Before calling this function the indio_dev structure should already be |
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* completely initialized, but not yet registered. In practice this means that |
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* this function should be called right before iio_device_register(). |
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* |
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* To free the resources allocated by this function call |
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* iio_triggered_buffer_cleanup(). |
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*/ |
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int iio_triggered_buffer_setup_ext(struct iio_dev *indio_dev, |
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irqreturn_t (*h)(int irq, void *p), |
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irqreturn_t (*thread)(int irq, void *p), |
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const struct iio_buffer_setup_ops *setup_ops, |
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const struct attribute **buffer_attrs) |
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{ |
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struct iio_buffer *buffer; |
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int ret; |
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buffer = iio_kfifo_allocate(); |
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if (!buffer) { |
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ret = -ENOMEM; |
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goto error_ret; |
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} |
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iio_device_attach_buffer(indio_dev, buffer); |
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indio_dev->pollfunc = iio_alloc_pollfunc(h, |
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thread, |
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IRQF_ONESHOT, |
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indio_dev, |
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"%s_consumer%d", |
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indio_dev->name, |
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indio_dev->id); |
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if (indio_dev->pollfunc == NULL) { |
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ret = -ENOMEM; |
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goto error_kfifo_free; |
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} |
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/* Ring buffer functions - here trigger setup related */ |
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indio_dev->setup_ops = setup_ops; |
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/* Flag that polled ring buffering is possible */ |
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indio_dev->modes |= INDIO_BUFFER_TRIGGERED; |
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buffer->attrs = buffer_attrs; |
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return 0; |
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error_kfifo_free: |
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iio_kfifo_free(indio_dev->buffer); |
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error_ret: |
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return ret; |
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} |
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EXPORT_SYMBOL(iio_triggered_buffer_setup_ext); |
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/** |
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* iio_triggered_buffer_cleanup() - Free resources allocated by iio_triggered_buffer_setup_ext() |
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* @indio_dev: IIO device structure |
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*/ |
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void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev) |
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{ |
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iio_dealloc_pollfunc(indio_dev->pollfunc); |
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iio_kfifo_free(indio_dev->buffer); |
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} |
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EXPORT_SYMBOL(iio_triggered_buffer_cleanup); |
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static void devm_iio_triggered_buffer_clean(struct device *dev, void *res) |
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{ |
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iio_triggered_buffer_cleanup(*(struct iio_dev **)res); |
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} |
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int devm_iio_triggered_buffer_setup_ext(struct device *dev, |
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struct iio_dev *indio_dev, |
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irqreturn_t (*h)(int irq, void *p), |
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irqreturn_t (*thread)(int irq, void *p), |
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const struct iio_buffer_setup_ops *ops, |
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const struct attribute **buffer_attrs) |
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{ |
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struct iio_dev **ptr; |
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int ret; |
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ptr = devres_alloc(devm_iio_triggered_buffer_clean, sizeof(*ptr), |
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GFP_KERNEL); |
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if (!ptr) |
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return -ENOMEM; |
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*ptr = indio_dev; |
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ret = iio_triggered_buffer_setup_ext(indio_dev, h, thread, ops, |
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buffer_attrs); |
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if (!ret) |
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devres_add(dev, ptr); |
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else |
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devres_free(ptr); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(devm_iio_triggered_buffer_setup_ext); |
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MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>"); |
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MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers"); |
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MODULE_LICENSE("GPL");
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