416 lines
9.8 KiB
C
416 lines
9.8 KiB
C
/*
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* usb.c
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*
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* (C) 2019 by Sylvain Munaut <tnt@246tNt.com>
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <talloc.h>
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#include <osmocom/core/isdnhdlc.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/usb/libusb.h>
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#include <libusb.h>
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#include "e1d.h"
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#include "log.h"
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#define USB_VID 0x1d50
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#define USB_PID 0xe1e1
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libusb_context *g_usb = NULL;
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struct e1_usb_flow;
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/* Driver data */
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struct e1_usb_line_data {
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/* Interface */
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uint8_t if_num;
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/* End Points */
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uint8_t ep_in;
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uint8_t ep_out;
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uint8_t ep_fb;
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/* Max packet size */
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int pkt_size;
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/* Flow */
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struct e1_usb_flow *flow_in;
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struct e1_usb_flow *flow_out;
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struct e1_usb_flow *flow_fb;
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/* Rate regulation */
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uint32_t r_acc;
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uint32_t r_sw;
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};
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struct e1_usb_intf_data {
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libusb_device_handle *devh;
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};
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/* Flow */
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struct e1_usb_flow_entry {
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uint8_t *buf;
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struct libusb_transfer *xfr;
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};
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typedef int (*xfer_cb_t)(struct e1_usb_flow *flow, uint8_t *buf, int size);
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struct e1_usb_flow {
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struct e1_line *line;
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xfer_cb_t cb;
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uint8_t ep;
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int count;
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int size;
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int ppx;
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struct e1_usb_flow_entry *entries;
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};
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// ---------------------------------------------------------------------------
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// USB data transfer
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// ---------------------------------------------------------------------------
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static int
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e1_usb_xfer_in(struct e1_usb_flow *flow, uint8_t *buf, int size)
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{
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return e1_line_demux_in(flow->line, buf + 4, size - 4);
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}
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static int
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e1_usb_xfer_out(struct e1_usb_flow *flow, uint8_t *buf, int size)
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{
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struct e1_line *line = flow->line;
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struct e1_usb_line_data *ld = (struct e1_usb_line_data *) line->drv_data;
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int fts;
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if (size <= 0) {
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LOGPLI(line, DXFR, LOGL_ERROR, "OUT ERROR: %d\n", size);
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return -1;
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}
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/* Flow regulation */
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ld->r_acc += ld->r_sw;
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fts = ld->r_acc >> 10;
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if (fts < 4) fts = 4;
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else if (fts > 12) fts = 12;
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ld->r_acc -= fts << 10;
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if (ld->r_acc & 0x80000000)
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ld->r_acc = 0;
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memset(buf, 0xff, 4);
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return e1_line_mux_out(line, buf+4, fts);
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}
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static int
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e1_usb_xfer_fb(struct e1_usb_flow *flow, uint8_t *buf, int size)
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{
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struct e1_usb_line_data *ld = (struct e1_usb_line_data *) flow->line->drv_data;
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if (size < 0) {
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LOGPLI(flow->line, DE1D, LOGL_ERROR, "Feedback transfer error\n");
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return 0;
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} else if (size != 3) {
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LOGPLI(flow->line, DE1D, LOGL_ERROR, "Feedback packet invalid size (%d)\n", size);
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return 0;
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}
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ld->r_sw = (buf[2] << 16) | (buf[1] << 8) | buf[0];
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return 0;
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}
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// ---------------------------------------------------------------------------
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// USB flow
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// ---------------------------------------------------------------------------
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static void LIBUSB_CALL
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_e1uf_xfr(struct libusb_transfer *xfr)
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{
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struct e1_usb_flow *flow = (struct e1_usb_flow *) xfr->user_data;
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struct e1_usb_intf_data *id = (struct e1_usb_intf_data *) flow->line->intf->drv_data;
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int j, rv, len;
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len = 0;
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/* FIXME: Check transfer status ? Error handling ? */
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if (flow->ep & 0x80) {
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for (j=0; j<flow->ppx; j++) {
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flow->cb(flow,
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libusb_get_iso_packet_buffer_simple(xfr, j),
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(xfr->iso_packet_desc[j].status == LIBUSB_TRANSFER_COMPLETED) ?
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xfr->iso_packet_desc[j].actual_length : -1
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);
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len += (xfr->iso_packet_desc[j].length = flow->size);
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}
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} else {
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for (j=0; j<flow->ppx; j++)
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len += (xfr->iso_packet_desc[j].length = flow->cb(flow, &xfr->buffer[len], flow->size));
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}
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libusb_fill_iso_transfer(xfr, id->devh, flow->ep,
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xfr->buffer, len, flow->ppx,
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_e1uf_xfr, flow, 0
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);
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rv = libusb_submit_transfer(xfr);
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if (rv)
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LOGPLI(flow->line, DE1D, LOGL_ERROR, "Failed to resubmit buffer for transfer\n");
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}
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static struct e1_usb_flow *
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e1uf_create(struct e1_line *line, xfer_cb_t cb,
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int ep, int count, int size, int ppx)
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{
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void *ctx = line->intf->e1d->ctx;
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struct e1_usb_flow *flow;
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flow = talloc_zero(ctx, struct e1_usb_flow);
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OSMO_ASSERT(flow);
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flow->line = line;
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flow->cb = cb;
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flow->ep = ep;
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flow->count = count;
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flow->size = size;
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flow->ppx = ppx;
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flow->entries = talloc_zero_size(ctx, count * sizeof(struct e1_usb_flow_entry));
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for (int i=0; i<count; i++)
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flow->entries[i].buf = talloc_zero_size(ctx, size * ppx);
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return flow;
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}
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static void __attribute__((unused))
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e1uf_destroy(struct e1_usb_flow *flow)
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{
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if (!flow)
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return;
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/* FIXME: stop pending transfers */
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for (int i=0; i<flow->count; i++)
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talloc_free(flow->entries[i].buf);
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talloc_free(flow->entries);
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talloc_free(flow);
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}
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static int
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e1uf_start(struct e1_usb_flow *flow)
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{
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struct e1_usb_intf_data *id = (struct e1_usb_intf_data *) flow->line->intf->drv_data;
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struct libusb_transfer *xfr;
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int i, j, rv, len;
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for (i=0; i<flow->count; i++)
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{
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xfr = libusb_alloc_transfer(flow->ppx);
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if (!xfr)
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return -ENOMEM;
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len = 0;
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if (flow->ep & 0x80) {
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for (j=0; j<flow->ppx; j++)
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len += (xfr->iso_packet_desc[j].length = flow->size);
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} else {
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for (j=0; j<flow->ppx; j++)
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len += (xfr->iso_packet_desc[j].length = flow->cb(flow, &flow->entries[i].buf[len], flow->size));
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}
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libusb_fill_iso_transfer(xfr, id->devh, flow->ep,
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flow->entries[i].buf, len, flow->ppx,
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_e1uf_xfr, flow, 0
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);
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rv = libusb_submit_transfer(xfr);
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if (rv)
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return rv;
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flow->entries[i].xfr = xfr;
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}
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return 0;
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}
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// ---------------------------------------------------------------------------
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// Init / Probing
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// ---------------------------------------------------------------------------
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int
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_e1_usb_open_device(struct e1_daemon *e1d, struct libusb_device *dev)
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{
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struct e1_intf *intf;
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struct e1_line *line;
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struct e1_usb_intf_data *intf_data;
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struct e1_usb_line_data *line_data;
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struct libusb_config_descriptor *cd;
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const struct libusb_interface_descriptor *id;
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libusb_device_handle *devh;
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int i, j, ret;
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ret = libusb_open(dev, &devh);
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if (ret) {
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LOGP(DE1D, LOGL_ERROR, "Failed to open usb device\n");
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return ret;
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}
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intf_data = talloc_zero(e1d->ctx, struct e1_usb_intf_data);
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intf_data->devh = devh;
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intf = e1_intf_new(e1d, intf_data);
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intf->drv = E1_DRIVER_USB;
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ret = libusb_get_active_config_descriptor(dev, &cd);
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if (ret) {
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LOGP(DE1D, LOGL_ERROR, "Failed to talk to usb device\n");
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return ret;
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}
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for (i=0; i<cd->bNumInterfaces; i++) {
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/* Expect 2 altsettings with proper class/subclass/eps */
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if (cd->interface[i].num_altsetting != 2)
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continue;
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id = &cd->interface[i].altsetting[1];
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if ((id->bInterfaceClass != 0xff) || (id->bInterfaceSubClass != 0xe1) || (id->bNumEndpoints != 3))
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continue;
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/* Get interface and set it up */
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ret = libusb_claim_interface(devh, id->bInterfaceNumber);
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if (ret) {
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LOGP(DE1D, LOGL_ERROR, "Failed to claim interface %d\n", id->bInterfaceNumber);
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return ret;
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}
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ret = libusb_set_interface_alt_setting(devh, id->bInterfaceNumber, 1);
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if (ret) {
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LOGP(DE1D, LOGL_ERROR, "Failed to set interface %d altsetting\n", id->bInterfaceNumber);
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return ret;
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}
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/* Setup driver data and find endpoints */
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line_data = talloc_zero(e1d->ctx, struct e1_usb_line_data);
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line_data->if_num = id->bInterfaceNumber;
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line_data->r_acc = 0;
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line_data->r_sw = 8192;
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for (j=0; j<id->bNumEndpoints; j++) {
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if (id->endpoint[j].bmAttributes == 0x11) {
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line_data->ep_fb = id->endpoint[j].bEndpointAddress;
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} else if (id->endpoint[j].bmAttributes == 0x05) {
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if (id->endpoint[j].bEndpointAddress & 0x80)
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line_data->ep_in = id->endpoint[j].bEndpointAddress;
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else
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line_data->ep_out = id->endpoint[j].bEndpointAddress;
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if (!line_data->pkt_size)
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line_data->pkt_size = id->endpoint[j].wMaxPacketSize;
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else if (line_data->pkt_size != id->endpoint[j].wMaxPacketSize)
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LOGP(DE1D, LOGL_ERROR, "Inconsistent max packet size %d vs %d\n",
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line_data->pkt_size, (int)id->endpoint[j].wMaxPacketSize);
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} else {
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LOGP(DE1D, LOGL_ERROR, "Invalid EP %02x\n", id->endpoint[j].bEndpointAddress);
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}
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}
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if (!line_data->ep_in || !line_data->ep_out || !line_data->ep_fb || !line_data->pkt_size) {
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LOGP(DE1D, LOGL_ERROR, "Failed to use interface %d\n", id->bInterfaceNumber);
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return -EINVAL;
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}
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line = e1_line_new(intf, line_data);
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line_data->flow_in = e1uf_create(line, e1_usb_xfer_in, line_data->ep_in, 2, line_data->pkt_size, 4);
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line_data->flow_out = e1uf_create(line, e1_usb_xfer_out, line_data->ep_out, 2, line_data->pkt_size, 4);
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line_data->flow_fb = e1uf_create(line, e1_usb_xfer_fb, line_data->ep_fb, 2, 8, 1);
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e1uf_start(line_data->flow_in);
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e1uf_start(line_data->flow_out);
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e1uf_start(line_data->flow_fb);
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}
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return 0;
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}
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int
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e1_usb_probe(struct e1_daemon *e1d)
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{
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struct libusb_device **dev_list;
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ssize_t n_dev;
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int i, ret;
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if (!g_usb) {
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ret = osmo_libusb_init(&g_usb);
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if (ret) {
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LOGP(DE1D, LOGL_ERROR, "Failed to initialize libusb\n");
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return -EIO;
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}
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}
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n_dev = libusb_get_device_list(g_usb, &dev_list);
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if (n_dev < 0) {
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LOGP(DE1D, LOGL_ERROR, "Failed to list devices\n");
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return -EIO;
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}
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for (i=0; i<n_dev; i++) {
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struct libusb_device_descriptor desc;
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ret = libusb_get_device_descriptor(dev_list[i], &desc);
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if (ret)
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continue;
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if ((desc.idVendor != USB_VID) || (desc.idProduct != USB_PID))
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continue;
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_e1_usb_open_device(e1d, dev_list[i]);
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}
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libusb_free_device_list(dev_list, 1);
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return 0;
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}
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