542 lines
12 KiB
C
542 lines
12 KiB
C
/*
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* STK1160 driver
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*
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* Copyright (C) 2012 Ezequiel Garcia
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* <elezegarcia--a.t--gmail.com>
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*
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* Based on Easycap driver by R.M. Thomas
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* Copyright (C) 2010 R.M. Thomas
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* <rmthomas--a.t--sciolus.org>
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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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*/
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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#include <linux/ratelimit.h>
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#include "stk1160.h"
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static unsigned int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "enable debug messages");
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static inline void print_err_status(struct stk1160 *dev,
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int packet, int status)
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{
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char *errmsg = "Unknown";
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switch (status) {
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case -ENOENT:
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errmsg = "unlinked synchronuously";
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break;
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case -ECONNRESET:
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errmsg = "unlinked asynchronuously";
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break;
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case -ENOSR:
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errmsg = "Buffer error (overrun)";
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break;
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case -EPIPE:
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errmsg = "Stalled (device not responding)";
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break;
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case -EOVERFLOW:
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errmsg = "Babble (bad cable?)";
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break;
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case -EPROTO:
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errmsg = "Bit-stuff error (bad cable?)";
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break;
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case -EILSEQ:
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errmsg = "CRC/Timeout (could be anything)";
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break;
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case -ETIME:
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errmsg = "Device does not respond";
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break;
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}
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if (packet < 0)
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printk_ratelimited(KERN_WARNING "URB status %d [%s].\n",
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status, errmsg);
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else
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printk_ratelimited(KERN_INFO "URB packet %d, status %d [%s].\n",
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packet, status, errmsg);
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}
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static inline
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struct stk1160_buffer *stk1160_next_buffer(struct stk1160 *dev)
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{
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struct stk1160_buffer *buf = NULL;
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unsigned long flags = 0;
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/* Current buffer must be NULL when this functions gets called */
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WARN_ON(dev->isoc_ctl.buf);
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spin_lock_irqsave(&dev->buf_lock, flags);
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if (!list_empty(&dev->avail_bufs)) {
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buf = list_first_entry(&dev->avail_bufs,
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struct stk1160_buffer, list);
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list_del(&buf->list);
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}
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spin_unlock_irqrestore(&dev->buf_lock, flags);
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return buf;
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}
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static inline
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void stk1160_buffer_done(struct stk1160 *dev)
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{
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struct stk1160_buffer *buf = dev->isoc_ctl.buf;
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dev->field_count++;
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buf->vb.v4l2_buf.sequence = dev->field_count >> 1;
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buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
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buf->vb.v4l2_buf.bytesused = buf->bytesused;
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v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
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vb2_set_plane_payload(&buf->vb, 0, buf->bytesused);
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vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
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dev->isoc_ctl.buf = NULL;
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}
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static inline
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void stk1160_copy_video(struct stk1160 *dev, u8 *src, int len)
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{
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int linesdone, lineoff, lencopy;
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int bytesperline = dev->width * 2;
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struct stk1160_buffer *buf = dev->isoc_ctl.buf;
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u8 *dst = buf->mem;
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int remain;
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/*
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* TODO: These stk1160_dbg are very spammy!
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* We should 1) check why we are getting them
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* and 2) add ratelimit.
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*
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* UPDATE: One of the reasons (the only one?) for getting these
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* is incorrect standard (mismatch between expected and configured).
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* So perhaps, we could add a counter for errors. When the counter
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* reaches some value, we simply stop streaming.
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*/
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len -= 4;
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src += 4;
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remain = len;
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linesdone = buf->pos / bytesperline;
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lineoff = buf->pos % bytesperline; /* offset in current line */
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if (!buf->odd)
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dst += bytesperline;
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/* Multiply linesdone by two, to take account of the other field */
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dst += linesdone * bytesperline * 2 + lineoff;
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/* Copy the remaining of current line */
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if (remain < (bytesperline - lineoff))
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lencopy = remain;
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else
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lencopy = bytesperline - lineoff;
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/*
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* Check if we have enough space left in the buffer.
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* In that case, we force loop exit after copy.
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*/
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if (lencopy > buf->bytesused - buf->length) {
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lencopy = buf->bytesused - buf->length;
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remain = lencopy;
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}
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/* Check if the copy is done */
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if (lencopy == 0 || remain == 0)
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return;
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/* Let the bug hunt begin! sanity checks! */
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if (lencopy < 0) {
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stk1160_dbg("copy skipped: negative lencopy\n");
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return;
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}
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if ((unsigned long)dst + lencopy >
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(unsigned long)buf->mem + buf->length) {
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printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n");
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return;
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}
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memcpy(dst, src, lencopy);
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buf->bytesused += lencopy;
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buf->pos += lencopy;
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remain -= lencopy;
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/* Copy current field line by line, interlacing with the other field */
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while (remain > 0) {
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dst += lencopy + bytesperline;
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src += lencopy;
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/* Copy one line at a time */
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if (remain < bytesperline)
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lencopy = remain;
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else
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lencopy = bytesperline;
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/*
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* Check if we have enough space left in the buffer.
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* In that case, we force loop exit after copy.
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*/
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if (lencopy > buf->bytesused - buf->length) {
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lencopy = buf->bytesused - buf->length;
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remain = lencopy;
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}
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/* Check if the copy is done */
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if (lencopy == 0 || remain == 0)
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return;
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if (lencopy < 0) {
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printk_ratelimited(KERN_WARNING "stk1160: negative lencopy detected\n");
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return;
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}
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if ((unsigned long)dst + lencopy >
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(unsigned long)buf->mem + buf->length) {
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printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n");
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return;
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}
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memcpy(dst, src, lencopy);
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remain -= lencopy;
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buf->bytesused += lencopy;
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buf->pos += lencopy;
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}
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}
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/*
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* Controls the isoc copy of each urb packet
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*/
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static void stk1160_process_isoc(struct stk1160 *dev, struct urb *urb)
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{
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int i, len, status;
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u8 *p;
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if (!dev) {
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stk1160_warn("%s called with null device\n", __func__);
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return;
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}
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if (urb->status < 0) {
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/* Print status and drop current packet (or field?) */
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print_err_status(dev, -1, urb->status);
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return;
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}
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for (i = 0; i < urb->number_of_packets; i++) {
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status = urb->iso_frame_desc[i].status;
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if (status < 0) {
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print_err_status(dev, i, status);
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continue;
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}
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/* Get packet actual length and pointer to data */
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p = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
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len = urb->iso_frame_desc[i].actual_length;
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/* Empty packet */
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if (len <= 4)
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continue;
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/*
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* An 8-byte packet sequence means end of field.
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* So if we don't have any packet, we start receiving one now
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* and if we do have a packet, then we are done with it.
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*
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* These end of field packets are always 0xc0 or 0x80,
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* but not always 8-byte long so we don't check packet length.
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*/
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if (p[0] == 0xc0) {
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/*
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* If first byte is 0xc0 then we received
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* second field, and frame has ended.
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*/
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if (dev->isoc_ctl.buf != NULL)
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stk1160_buffer_done(dev);
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dev->isoc_ctl.buf = stk1160_next_buffer(dev);
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if (dev->isoc_ctl.buf == NULL)
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return;
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}
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/*
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* If we don't have a buffer here, then it means we
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* haven't found the start mark sequence.
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*/
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if (dev->isoc_ctl.buf == NULL)
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continue;
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if (p[0] == 0xc0 || p[0] == 0x80) {
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/* We set next packet parity and
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* continue to get next one
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*/
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dev->isoc_ctl.buf->odd = *p & 0x40;
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dev->isoc_ctl.buf->pos = 0;
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continue;
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}
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stk1160_copy_video(dev, p, len);
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}
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}
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/*
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* IRQ callback, called by URB callback
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*/
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static void stk1160_isoc_irq(struct urb *urb)
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{
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int i, rc;
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struct stk1160 *dev = urb->context;
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switch (urb->status) {
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case 0:
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break;
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case -ECONNRESET: /* kill */
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case -ENOENT:
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case -ESHUTDOWN:
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/* TODO: check uvc driver: he frees the queue here */
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return;
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default:
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stk1160_err("urb error! status %d\n", urb->status);
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return;
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}
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stk1160_process_isoc(dev, urb);
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/* Reset urb buffers */
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for (i = 0; i < urb->number_of_packets; i++) {
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urb->iso_frame_desc[i].status = 0;
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urb->iso_frame_desc[i].actual_length = 0;
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}
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rc = usb_submit_urb(urb, GFP_ATOMIC);
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if (rc)
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stk1160_err("urb re-submit failed (%d)\n", rc);
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}
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/*
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* Cancel urbs
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* This function can't be called in atomic context
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*/
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void stk1160_cancel_isoc(struct stk1160 *dev)
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{
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int i, num_bufs = dev->isoc_ctl.num_bufs;
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/*
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* This check is not necessary, but we add it
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* to avoid a spurious debug message
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*/
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if (!num_bufs)
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return;
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stk1160_dbg("killing %d urbs...\n", num_bufs);
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for (i = 0; i < num_bufs; i++) {
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/*
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* To kill urbs we can't be in atomic context.
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* We don't care for NULL pointer since
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* usb_kill_urb allows it.
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*/
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usb_kill_urb(dev->isoc_ctl.urb[i]);
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}
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stk1160_dbg("all urbs killed\n");
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}
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/*
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* Releases urb and transfer buffers
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* Obviusly, associated urb must be killed before releasing it.
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*/
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void stk1160_free_isoc(struct stk1160 *dev)
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{
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struct urb *urb;
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int i, num_bufs = dev->isoc_ctl.num_bufs;
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stk1160_dbg("freeing %d urb buffers...\n", num_bufs);
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for (i = 0; i < num_bufs; i++) {
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urb = dev->isoc_ctl.urb[i];
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if (urb) {
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if (dev->isoc_ctl.transfer_buffer[i]) {
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#ifndef CONFIG_DMA_NONCOHERENT
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usb_free_coherent(dev->udev,
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urb->transfer_buffer_length,
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dev->isoc_ctl.transfer_buffer[i],
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urb->transfer_dma);
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#else
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kfree(dev->isoc_ctl.transfer_buffer[i]);
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#endif
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}
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usb_free_urb(urb);
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dev->isoc_ctl.urb[i] = NULL;
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}
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dev->isoc_ctl.transfer_buffer[i] = NULL;
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}
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kfree(dev->isoc_ctl.urb);
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kfree(dev->isoc_ctl.transfer_buffer);
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dev->isoc_ctl.urb = NULL;
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dev->isoc_ctl.transfer_buffer = NULL;
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dev->isoc_ctl.num_bufs = 0;
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stk1160_dbg("all urb buffers freed\n");
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}
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/*
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* Helper for cancelling and freeing urbs
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* This function can't be called in atomic context
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*/
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void stk1160_uninit_isoc(struct stk1160 *dev)
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{
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stk1160_cancel_isoc(dev);
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stk1160_free_isoc(dev);
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}
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/*
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* Allocate URBs
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*/
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int stk1160_alloc_isoc(struct stk1160 *dev)
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{
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struct urb *urb;
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int i, j, k, sb_size, max_packets, num_bufs;
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/*
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* It may be necessary to release isoc here,
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* since isoc are only released on disconnection.
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* (see new_pkt_size flag)
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*/
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if (dev->isoc_ctl.num_bufs)
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stk1160_uninit_isoc(dev);
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stk1160_dbg("allocating urbs...\n");
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num_bufs = STK1160_NUM_BUFS;
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max_packets = STK1160_NUM_PACKETS;
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sb_size = max_packets * dev->max_pkt_size;
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dev->isoc_ctl.buf = NULL;
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dev->isoc_ctl.max_pkt_size = dev->max_pkt_size;
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dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
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if (!dev->isoc_ctl.urb) {
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stk1160_err("out of memory for urb array\n");
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return -ENOMEM;
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}
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dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
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GFP_KERNEL);
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if (!dev->isoc_ctl.transfer_buffer) {
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stk1160_err("out of memory for usb transfers\n");
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kfree(dev->isoc_ctl.urb);
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return -ENOMEM;
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}
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/* allocate urbs and transfer buffers */
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for (i = 0; i < num_bufs; i++) {
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urb = usb_alloc_urb(max_packets, GFP_KERNEL);
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if (!urb) {
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stk1160_err("cannot alloc urb[%d]\n", i);
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goto free_i_bufs;
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}
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dev->isoc_ctl.urb[i] = urb;
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#ifndef CONFIG_DMA_NONCOHERENT
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dev->isoc_ctl.transfer_buffer[i] = usb_alloc_coherent(dev->udev,
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sb_size, GFP_KERNEL, &urb->transfer_dma);
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#else
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dev->isoc_ctl.transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL);
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#endif
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if (!dev->isoc_ctl.transfer_buffer[i]) {
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stk1160_err("cannot alloc %d bytes for tx[%d] buffer\n",
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sb_size, i);
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/* Not enough transfer buffers, so just give up */
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if (i < STK1160_MIN_BUFS)
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goto free_i_bufs;
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goto nomore_tx_bufs;
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}
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memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
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/*
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* FIXME: Where can I get the endpoint?
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*/
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urb->dev = dev->udev;
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urb->pipe = usb_rcvisocpipe(dev->udev, STK1160_EP_VIDEO);
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urb->transfer_buffer = dev->isoc_ctl.transfer_buffer[i];
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urb->transfer_buffer_length = sb_size;
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urb->complete = stk1160_isoc_irq;
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urb->context = dev;
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urb->interval = 1;
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urb->start_frame = 0;
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urb->number_of_packets = max_packets;
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#ifndef CONFIG_DMA_NONCOHERENT
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urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
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#else
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urb->transfer_flags = URB_ISO_ASAP;
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#endif
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k = 0;
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for (j = 0; j < max_packets; j++) {
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urb->iso_frame_desc[j].offset = k;
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urb->iso_frame_desc[j].length =
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dev->isoc_ctl.max_pkt_size;
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k += dev->isoc_ctl.max_pkt_size;
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}
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}
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stk1160_dbg("%d urbs allocated\n", num_bufs);
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/* At last we can say we have some buffers */
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dev->isoc_ctl.num_bufs = num_bufs;
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return 0;
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nomore_tx_bufs:
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/*
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* Failed to allocate desired buffer count. However, we may have
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* enough to work fine, so we just free the extra urb,
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* store the allocated count and keep going, fingers crossed!
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*/
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usb_free_urb(dev->isoc_ctl.urb[i]);
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dev->isoc_ctl.urb[i] = NULL;
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stk1160_warn("%d urbs allocated. Trying to continue...\n", i - 1);
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dev->isoc_ctl.num_bufs = i - 1;
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return 0;
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free_i_bufs:
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/* Save the allocated buffers so far, so we can properly free them */
|
|
dev->isoc_ctl.num_bufs = i+1;
|
|
stk1160_free_isoc(dev);
|
|
return -ENOMEM;
|
|
}
|
|
|