base.c

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/*******************************************************************
 *   _________     _____      _____    ____  _____    ___  ____    *
 *  |_   ___  |  |_   _|     |_   _|  |_   \|_   _|  |_  ||_  _|   *
 *    | |_  \_|    | |         | |      |   \ | |      | |_/ /     *
 *    |  _|        | |   _     | |      | |\ \| |      |  __'.     *
 *   _| |_        _| |__/ |   _| |_    _| |_\   |_    _| |  \ \_   *
 *  |_____|      |________|  |_____|  |_____|\____|  |____||____|  *
 *                                                                 *
 *******************************************************************
 *                                                                 *
 *  fLink userspace library, base functionality                    *
 *                                                                 *
 *******************************************************************/
 
#include "flinklib.h"
#include "flinkioctl.h"
#include "types.h"
#include "valid.h"
#include "error.h"
#include "log.h"

#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>


/*******************************************************************
 *                                                                 *
 *  Internal (private) methods                                     *
 *                                                                 *
 *******************************************************************/

static int read_nof_subdevices(flink_dev* dev) {
    uint8_t n = 0;
    
    dbg_print("reading number of subdevices...\n");
    
    if(flink_ioctl(dev, READ_NOF_SUBDEVICES, &n) < 0) {
        dbg_print("   --> failed!\n");
        libc_error();
        return EXIT_ERROR;
    }
    dbg_print("  --> %u\n", n);
    return n;
}

static int get_subdevices(flink_dev* dev) {
    flink_subdev* subdev = NULL;
    int i = 0, ret = 0;
    
    if(!validate_flink_dev(dev)) {
        flink_error(FLINK_EINVALDEV);
        return EXIT_ERROR;
    }
    
    // Read nof subdevices
    dev->nof_subdevices = read_nof_subdevices(dev);
    
    // Allocate memory
    dev->subdevices = calloc(dev->nof_subdevices, sizeof(flink_subdev));
    if(dev->subdevices == NULL) { // allocation failed
        libc_error();
        dev->nof_subdevices = 0;
        return EXIT_ERROR;
    }
    
    // Fillup all information
    for(i = 0; i < dev->nof_subdevices; i++) { // for each subdevice
        subdev = dev->subdevices + i;
        subdev->id = i;
        ret = flink_ioctl(dev, READ_SUBDEVICE_INFO, subdev);
        subdev->parent = dev;
    }
    
    return ret;
}


/*******************************************************************
 *                                                                 *
 *  Public methods                                                 *
 *                                                                 *
 *******************************************************************/

flink_dev* flink_open(const char* file_name) {
    flink_dev* dev = NULL;
    
    // Allocate memory for flink_t
    dev = malloc(sizeof(flink_dev));
    if(dev == NULL) { // allocation failed
        libc_error();
        return NULL;
    }
    
    // Open device file
    dev->fd = open(file_name, O_RDWR);
    if(dev->fd < 0) { // failed to open device
        free(dev);
        libc_error();
        return NULL;
    }
    
    if(get_subdevices(dev) < 0) { // reading subdevices failed
        close(dev->fd);
        free(dev);
        return NULL;
    }
    
    return dev;
}


int flink_close(flink_dev* dev) {
    flink_subdev* subdev = NULL;
    int i = 0;

    if(!validate_flink_dev(dev)) {
        flink_error(FLINK_EINVALDEV);
        return EXIT_ERROR;
    }
    
    if(dev->subdevices) {
        free(dev->subdevices);
    }
    
    close(dev->fd);
    free(dev);
    return EXIT_SUCCESS;
}


int flink_get_nof_subdevices(flink_dev* dev) {
    
    if(!validate_flink_dev(dev)) {
        flink_error(FLINK_EINVALDEV);
        return EXIT_ERROR;
    }
    
    return dev->nof_subdevices;
}


int flink_subdevice_reset(flink_subdev* subdev) {
    uint32_t offset = CONFIG_OFFSET;
    uint8_t reset = 1;
    
    if(!validate_flink_subdev(subdev)) {
        flink_error(FLINK_EINVALSUBDEV);
        return EXIT_ERROR;
    }
    
    if(flink_write_bit(subdev, offset, RESET_BIT, &reset)) {
        libc_error();
        return EXIT_ERROR;
    }
    return EXIT_SUCCESS;
}


int flink_subdevice_select(flink_subdev* subdev, uint8_t exclusive) {
    ioctl_cmd_t cmd = SELECT_SUBDEVICE;
    if(exclusive) cmd = SELECT_SUBDEVICE_EXCL;
    
    if(flink_ioctl(subdev->parent, cmd, &(subdev->id)) < 0) {
        libc_error();
        return EXIT_ERROR;
    }
    return EXIT_SUCCESS;
}

flink_subdev* flink_get_subdevice_by_id(flink_dev* dev, uint8_t subdev_id) {
    
    // Check flink device structure
    if(!validate_flink_dev(dev)) {
        flink_error(FLINK_EINVALDEV);
        return NULL;
    }

    // Check subdevice id
    if(subdev_id > dev->nof_subdevices) {
        flink_error(FLINK_EINVALSUBDEV);
        return NULL;
    }
    
    return dev->subdevices + subdev_id;
}

flink_subdev* flink_get_subdevice_by_unique_id(flink_dev* dev, uint8_t unique_id) {
    flink_subdev* subdev = dev->subdevices;

    // Check flink device structure
    if(!validate_flink_dev(dev)) {
        flink_error(FLINK_EINVALDEV);
        return NULL;
    }

    while(subdev != NULL) {
        if(subdev->unique_id == unique_id) {
            return dev->subdevices;
        }
        subdev = subdev + 1;
    }
    return NULL;
}

uint8_t flink_subdevice_get_id(flink_subdev* subdev) {
    return subdev->id;
}

uint16_t flink_subdevice_get_function(flink_subdev* subdev) {
    return subdev->function_id;
}

uint8_t flink_subdevice_get_subfunction(flink_subdev* subdev) {
    return subdev->sub_function_id;
}

uint8_t flink_subdevice_get_function_version(flink_subdev* subdev) {
    return subdev->function_version;
}

uint32_t flink_subdevice_get_baseaddr(flink_subdev* subdev) {
    return subdev->base_addr;
}

uint32_t flink_subdevice_get_memsize(flink_subdev* subdev) {
    return subdev->mem_size;
}

uint32_t flink_subdevice_get_nofchannels(flink_subdev* subdev) {
    return subdev->nof_channels;
}

uint32_t flink_subdevice_get_unique_id(flink_subdev* subdev) {
    return subdev->unique_id;
}