| /* |
| * Copyright (c) 2012 Analog Devices, Inc. |
| * Author: Lars-Peter Clausen <lars@metafoo.de> |
| * |
| * 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. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/module.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/buffer.h> |
| #include <linux/iio/kfifo_buf.h> |
| #include <linux/iio/triggered_buffer.h> |
| #include <linux/iio/trigger_consumer.h> |
| |
| static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = { |
| .preenable = &iio_sw_buffer_preenable, |
| .postenable = &iio_triggered_buffer_postenable, |
| .predisable = &iio_triggered_buffer_predisable, |
| }; |
| |
| /** |
| * iio_triggered_buffer_setup() - Setup triggered buffer and pollfunc |
| * @indio_dev: IIO device structure |
| * @pollfunc_bh: Function which will be used as pollfunc bottom half |
| * @pollfunc_th: Function which will be used as pollfunc top half |
| * @setup_ops: Buffer setup functions to use for this device. |
| * If NULL the default setup functions for triggered |
| * buffers will be used. |
| * |
| * This function combines some common tasks which will normally be performed |
| * when setting up a triggered buffer. It will allocate the buffer and the |
| * pollfunc, as well as register the buffer with the IIO core. |
| * |
| * Before calling this function the indio_dev structure should already be |
| * completely initialized, but not yet registered. In practice this means that |
| * this function should be called right before iio_device_register(). |
| * |
| * To free the resources allocated by this function call |
| * iio_triggered_buffer_cleanup(). |
| */ |
| int iio_triggered_buffer_setup(struct iio_dev *indio_dev, |
| irqreturn_t (*pollfunc_bh)(int irq, void *p), |
| irqreturn_t (*pollfunc_th)(int irq, void *p), |
| const struct iio_buffer_setup_ops *setup_ops) |
| { |
| struct iio_buffer *buffer; |
| int ret; |
| |
| buffer = iio_kfifo_allocate(indio_dev); |
| if (!buffer) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| |
| iio_device_attach_buffer(indio_dev, buffer); |
| |
| indio_dev->pollfunc = iio_alloc_pollfunc(pollfunc_bh, |
| pollfunc_th, |
| IRQF_ONESHOT, |
| indio_dev, |
| "%s_consumer%d", |
| indio_dev->name, |
| indio_dev->id); |
| if (indio_dev->pollfunc == NULL) { |
| ret = -ENOMEM; |
| goto error_kfifo_free; |
| } |
| |
| /* Ring buffer functions - here trigger setup related */ |
| if (setup_ops) |
| indio_dev->setup_ops = setup_ops; |
| else |
| indio_dev->setup_ops = &iio_triggered_buffer_setup_ops; |
| |
| /* Flag that polled ring buffering is possible */ |
| indio_dev->modes |= INDIO_BUFFER_TRIGGERED; |
| |
| ret = iio_buffer_register(indio_dev, |
| indio_dev->channels, |
| indio_dev->num_channels); |
| if (ret) |
| goto error_dealloc_pollfunc; |
| |
| return 0; |
| |
| error_dealloc_pollfunc: |
| iio_dealloc_pollfunc(indio_dev->pollfunc); |
| error_kfifo_free: |
| iio_kfifo_free(indio_dev->buffer); |
| error_ret: |
| return ret; |
| } |
| EXPORT_SYMBOL(iio_triggered_buffer_setup); |
| |
| /** |
| * iio_triggered_buffer_cleanup() - Free resources allocated by iio_triggered_buffer_setup() |
| * @indio_dev: IIO device structure |
| */ |
| void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev) |
| { |
| iio_buffer_unregister(indio_dev); |
| iio_dealloc_pollfunc(indio_dev->pollfunc); |
| iio_kfifo_free(indio_dev->buffer); |
| } |
| EXPORT_SYMBOL(iio_triggered_buffer_cleanup); |
| |
| MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers"); |
| MODULE_LICENSE("GPL"); |