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/* USB communication methods
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
*/
#include "board.h"
#include "llist_irqsafe.h"
#include "usb_buf.h"
#include "utils.h"
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/msgb.h>
#include <errno.h>
/***********************************************************************
* USBD Integration API
***********************************************************************/
/* call-back after (successful?) transfer of a buffer */
static void usb_write_cb(uint8_t *arg, uint8_t status, uint32_t transferred,
uint32_t remaining)
{
struct msgb *msg = (struct msgb *) arg;
struct usb_buffered_ep *bep = msg->dst;
unsigned long x;
TRACE_DEBUG("%s (EP=0x%02x)\r\n", __func__, bep->ep);
local_irq_save(x);
bep->in_progress--;
local_irq_restore(x);
TRACE_DEBUG("%u: in_progress=%d\n", bep->ep, bep->in_progress);
if (status != USBD_STATUS_SUCCESS)
TRACE_ERROR("%s error, status=%d\n", __func__, status);
usb_buf_free(msg);
}
int usb_refill_to_host(uint8_t ep)
{
struct usb_buffered_ep *bep = usb_get_buf_ep(ep);
struct msgb *msg;
unsigned long x;
int rc;
#if 0
if (bep->out_from_host) {
TRACE_ERROR("EP 0x%02x is not IN\r\n", bep->ep);
return -EINVAL;
}
#endif
local_irq_save(x);
if (bep->in_progress) {
local_irq_restore(x);
return 0;
}
if (llist_empty(&bep->queue)) {
local_irq_restore(x);
return 0;
}
bep->in_progress++;
msg = msgb_dequeue(&bep->queue);
local_irq_restore(x);
TRACE_DEBUG("%s (EP=0x%02x), in_progress=%d\r\n", __func__, ep, bep->in_progress);
msg->dst = bep;
rc = USBD_Write(ep, msgb_data(msg), msgb_length(msg),
(TransferCallback) &usb_write_cb, msg);
if (rc != USBD_STATUS_SUCCESS) {
TRACE_ERROR("%s error %x\n", __func__, rc);
/* re-insert to head of queue */
llist_add_irqsafe(&msg->list, &bep->queue);
local_irq_save(x);
bep->in_progress--;
local_irq_restore(x);
TRACE_DEBUG("%02x: in_progress=%d\n", bep->ep, bep->in_progress);
return 0;
}
return 1;
}
/* call-back after (successful?) transfer of a buffer */
static void usb_read_cb(uint8_t *arg, uint8_t status, uint32_t transferred,
uint32_t remaining)
{
struct msgb *msg = (struct msgb *) arg;
struct usb_buffered_ep *bep = msg->dst;
TRACE_DEBUG("%s (EP=%u, len=%u, q=%p)\r\n", __func__,
bep->ep, transferred, &bep->queue);
bep->in_progress = 0;
if (status != USBD_STATUS_SUCCESS) {
TRACE_ERROR("%s error, status=%d\n", __func__, status);
usb_buf_free(msg);
return;
}
msgb_put(msg, transferred);
llist_add_tail_irqsafe(&msg->list, &bep->queue);
}
int usb_refill_from_host(uint8_t ep)
{
struct usb_buffered_ep *bep = usb_get_buf_ep(ep);
struct msgb *msg;
unsigned long x;
int rc;
#if 0
if (!bep->out_from_host) {
TRACE_ERROR("EP 0x%02x is not OUT\r\n", bep->ep);
return -EINVAL;
}
#endif
if (bep->in_progress)
return 0;
TRACE_DEBUG("%s (EP=0x%02x)\r\n", __func__, bep->ep);
msg = usb_buf_alloc(bep->ep);
if (!msg)
return -ENOMEM;
msg->dst = bep;
msg->l1h = msg->head;
bep->in_progress = 1;
rc = USBD_Read(ep, msg->head, msgb_tailroom(msg),
(TransferCallback) &usb_read_cb, msg);
if (rc != USBD_STATUS_SUCCESS) {
TRACE_ERROR("%s error %s\n", __func__, rc);
usb_buf_free(msg);
bep->in_progress = 0;
}
return 1;
}
int usb_drain_queue(uint8_t ep)
{
struct usb_buffered_ep *bep = usb_get_buf_ep(ep);
struct msgb *msg;
unsigned long x;
int ret = 0;
/* wait until no transfers are in progress anymore and block
* further interrupts */
while (1) {
local_irq_save(x);
if (!bep->in_progress) {
break;
}
local_irq_restore(x);
/* retry */
}
/* free all queued msgbs */
while ((msg = msgb_dequeue(&bep->queue))) {
usb_buf_free(msg);
ret++;
}
/* re-enable interrupts and return number of free'd msgbs */
local_irq_restore(x);
return ret;
}
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