drivers/usb/usb_lib.c

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#include <assert.h>
#include <mempool.h>
#include <physmem.h>
#include <util.h>
#include <usb/request.h>

#include <app/config_usb.h>

static struct mem_pool  usb_request_pool;

void usb_req_init(struct usb_request *req)
{
        slist_init(&req->buf_list);
        req->flags = 0;
        req->bytes_xfered = 0;
}

struct usb_request *usb_req_alloc(void)
{
        struct usb_request      *req;

        req = mem_pool_alloc(&usb_request_pool);
        if (req)
                usb_req_init(req);

        return req;
}

void usb_req_free(struct usb_request *req)
{
        // dbg_printf("free req %p\n", req);
        mem_pool_free(&usb_request_pool, req);
}

struct usb_request *usb_req_alloc_single_tx(const void *data, size_t len)
{
        struct usb_request      *req;
        struct buffer           *buf;

        buf = buffer_alloc();
        if (!buf)
                return NULL;
        req = usb_req_alloc();
        if (!req) {
                buffer_free(buf);
                return NULL;
        }

        buffer_init_tx(buf, data, len);
        usb_req_add_buffer(req, buf);

        return req;
}

struct usb_request *usb_req_alloc_single_rx(void *data, size_t len)
{
        struct usb_request      *req;
        struct buffer           *buf;

        buf = buffer_alloc();
        if (!buf)
                return NULL;
        req = usb_req_alloc();
        if (!req) {
                buffer_free(buf);
                return NULL;
        }

        buffer_init_rx(buf, data, len);
        usb_req_add_buffer(req, buf);

        return req;
}

extern void usb_req_free_all(struct usb_request *req)
{
        struct buffer   *buf;
        struct buffer   *next;

        usb_req_for_each_buffer_safe(req, buf, next) {
                dbg_printf("req %p buf %p next %p\n", req, buf, next);
                buffer_free(buf);
        }
        usb_req_free(req);
}

void usb_init(void)
{
        mem_pool_init_physmem(&usb_request_pool, &cpu_sram_pool,
                        CONFIG_USB_NR_REQUESTS,
                        sizeof(struct usb_request), 2);
}

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