214 lines
6.7 KiB
C
214 lines
6.7 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2014 Kumar Abhishek <abhishek@theembeddedkitchen.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef BEAGLELOGIC_H_
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#define BEAGLELOGIC_H_
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* BeagleLogic device node name */
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#define BEAGLELOGIC_DEV_NODE "/dev/beaglelogic"
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#define BEAGLELOGIC_SYSFS_ATTR(a) "/sys/devices/virtual/misc/beaglelogic/"\
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__STRING(a)
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/* Reproduced verbatim from beaglelogic.h in the kernel tree until the kernel
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* module hits the mainline. Contains the ABI, so DO NOT TOUCH this section */
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/* ioctl calls that can be issued on /dev/beaglelogic */
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#define IOCTL_BL_GET_VERSION _IOR('k', 0x20, uint32_t)
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#define IOCTL_BL_GET_SAMPLE_RATE _IOR('k', 0x21, uint32_t)
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#define IOCTL_BL_SET_SAMPLE_RATE _IOW('k', 0x21, uint32_t)
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#define IOCTL_BL_GET_SAMPLE_UNIT _IOR('k', 0x22, uint32_t)
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#define IOCTL_BL_SET_SAMPLE_UNIT _IOW('k', 0x22, uint32_t)
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#define IOCTL_BL_GET_TRIGGER_FLAGS _IOR('k', 0x23, uint32_t)
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#define IOCTL_BL_SET_TRIGGER_FLAGS _IOW('k', 0x23, uint32_t)
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#define IOCTL_BL_CACHE_INVALIDATE _IO('k', 0x25)
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#define IOCTL_BL_GET_BUFFER_SIZE _IOR('k', 0x26, uint32_t)
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#define IOCTL_BL_SET_BUFFER_SIZE _IOW('k', 0x26, uint32_t)
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#define IOCTL_BL_GET_BUFUNIT_SIZE _IOR('k', 0x27, uint32_t)
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#define IOCTL_BL_FILL_TEST_PATTERN _IO('k', 0x28)
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#define IOCTL_BL_START _IO('k', 0x29)
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#define IOCTL_BL_STOP _IO('k', 0x2A)
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/* Possible States of BeagleLogic */
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enum beaglelogic_states {
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STATE_BL_DISABLED, /* Powered off (at module start) */
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STATE_BL_INITIALIZED, /* Powered on */
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STATE_BL_MEMALLOCD, /* Buffers allocated */
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STATE_BL_ARMED, /* All Buffers DMA-mapped and configuration done */
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STATE_BL_RUNNING, /* Data being captured */
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STATE_BL_REQUEST_STOP, /* Stop requested */
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STATE_BL_ERROR /* Buffer overrun */
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};
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/* Setting attributes */
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enum beaglelogic_triggerflags {
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BL_TRIGGERFLAGS_ONESHOT = 0,
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BL_TRIGGERFLAGS_CONTINUOUS
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};
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/* Possible sample unit / formats */
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enum beaglelogic_sampleunit {
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BL_SAMPLEUNIT_16_BITS = 0,
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BL_SAMPLEUNIT_8_BITS
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};
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/* END beaglelogic.h */
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/* For all the functions below:
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* Parameters:
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* devc : Device context structure to operate on
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* Returns:
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* SR_OK or SR_ERR
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*/
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SR_PRIV int beaglelogic_open_nonblock(struct dev_context *devc);
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SR_PRIV int beaglelogic_close(struct dev_context *devc);
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SR_PRIV int beaglelogic_get_buffersize(struct dev_context *devc);
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SR_PRIV int beaglelogic_set_buffersize(struct dev_context *devc);
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SR_PRIV int beaglelogic_get_samplerate(struct dev_context *devc);
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SR_PRIV int beaglelogic_set_samplerate(struct dev_context *devc);
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SR_PRIV int beaglelogic_get_sampleunit(struct dev_context *devc);
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SR_PRIV int beaglelogic_set_sampleunit(struct dev_context *devc);
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SR_PRIV int beaglelogic_get_triggerflags(struct dev_context *devc);
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SR_PRIV int beaglelogic_set_triggerflags(struct dev_context *devc);
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/* Start and stop the capture operation */
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SR_PRIV int beaglelogic_start(struct dev_context *devc);
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SR_PRIV int beaglelogic_stop(struct dev_context *devc);
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/* Get the last error size */
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SR_PRIV int beaglelogic_getlasterror(struct dev_context *devc);
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/* Gets the unit size of the capture buffer (usually 4 or 8 MB) */
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SR_PRIV int beaglelogic_get_bufunitsize(struct dev_context *devc);
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SR_PRIV int beaglelogic_mmap(struct dev_context *devc);
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SR_PRIV int beaglelogic_munmap(struct dev_context *devc);
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/* Sources */
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SR_PRIV inline int beaglelogic_open_nonblock(struct dev_context *devc) {
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devc->fd = open(BEAGLELOGIC_DEV_NODE, O_RDONLY | O_NONBLOCK);
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return (devc->fd == -1 ? SR_ERR : SR_OK);
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}
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SR_PRIV inline int beaglelogic_close(struct dev_context *devc) {
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return close(devc->fd);
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}
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SR_PRIV inline int beaglelogic_get_buffersize(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_GET_BUFFER_SIZE, &devc->buffersize);
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}
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SR_PRIV inline int beaglelogic_set_buffersize(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_SET_BUFFER_SIZE, devc->buffersize);
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}
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/* This is treated differently as it gets a uint64_t while a uint32_t is read */
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SR_PRIV inline int beaglelogic_get_samplerate(struct dev_context *devc) {
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uint32_t arg, err;
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err = ioctl(devc->fd, IOCTL_BL_GET_SAMPLE_RATE, &arg);
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devc->cur_samplerate = arg;
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return err;
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}
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SR_PRIV inline int beaglelogic_set_samplerate(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_SET_SAMPLE_RATE,
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(uint32_t)devc->cur_samplerate);
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}
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SR_PRIV inline int beaglelogic_get_sampleunit(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_GET_SAMPLE_UNIT, &devc->sampleunit);
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}
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SR_PRIV inline int beaglelogic_set_sampleunit(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_SET_SAMPLE_UNIT, devc->sampleunit);
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}
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SR_PRIV inline int beaglelogic_get_triggerflags(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_GET_TRIGGER_FLAGS, &devc->triggerflags);
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}
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SR_PRIV inline int beaglelogic_set_triggerflags(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_SET_TRIGGER_FLAGS, devc->triggerflags);
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}
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SR_PRIV int beaglelogic_getlasterror(struct dev_context *devc) {
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int fd;
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char buf[16];
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int ret;
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if ((fd = open(BEAGLELOGIC_SYSFS_ATTR(lasterror), O_RDONLY)) == -1)
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return SR_ERR;
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if ((ret = read(fd, buf, 16)) < 0)
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return SR_ERR;
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close(fd);
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devc->last_error = strtoul(buf, NULL, 10);
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return SR_OK;
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}
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SR_PRIV inline int beaglelogic_start(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_START);
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}
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SR_PRIV inline int beaglelogic_stop(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_STOP);
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}
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SR_PRIV int beaglelogic_get_bufunitsize(struct dev_context *devc) {
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return ioctl(devc->fd, IOCTL_BL_GET_BUFUNIT_SIZE, &devc->bufunitsize);
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}
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SR_PRIV int beaglelogic_mmap(struct dev_context *devc) {
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if (!devc->buffersize)
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beaglelogic_get_buffersize(devc);
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devc->sample_buf = mmap(NULL, devc->buffersize,
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PROT_READ, MAP_SHARED, devc->fd, 0);
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return (devc->sample_buf == MAP_FAILED ? -1 : SR_OK);
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}
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SR_PRIV int beaglelogic_munmap(struct dev_context *devc) {
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return munmap(devc->sample_buf, devc->buffersize);
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}
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#endif /* BEAGLELOGIC_H_ */
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