add iso_xmit_sync() and iso_xmit_write(); clean up iso handling a bit
git-svn-id: svn://svn.linux1394.org/libraw1394/trunk@102 53a565d1-3bb7-0310-b661-cf11e63c67ab
This commit is contained in:
dmaas
parent
e6e6375cee
commit
2ecf31c96d
175
src/iso.c
175
src/iso.c
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@ -13,6 +13,7 @@
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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@ -118,7 +119,7 @@ static int do_iso_init(raw1394handle_t handle,
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unsigned int bufsize, stride;
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/* already initialized? */
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if(handle->iso_buffer)
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if(handle->iso_mode != ISO_INACTIVE)
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return -1;
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/* choose a power-of-two stride for the packet data buffer,
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@ -160,6 +161,8 @@ static int do_iso_init(raw1394handle_t handle,
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handle->iso_xmit_handler = NULL;
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handle->iso_recv_handler = NULL;
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handle->iso_state = ISO_STOP;
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return 0;
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}
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@ -186,6 +189,7 @@ int raw1394_iso_xmit_init(raw1394handle_t handle,
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irq_interval, RAW1394_ISO_XMIT_INIT))
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return -1;
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handle->iso_mode = ISO_XMIT;
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handle->iso_xmit_handler = handler;
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handle->next_packet = 0;
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@ -215,6 +219,7 @@ int raw1394_iso_recv_init(raw1394handle_t handle,
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irq_interval, RAW1394_ISO_RECV_INIT))
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return -1;
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handle->iso_mode = ISO_RECV;
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handle->iso_recv_handler = handler;
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return 0;
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}
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@ -240,6 +245,7 @@ int raw1394_iso_multichannel_recv_init(raw1394handle_t handle,
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irq_interval, RAW1394_ISO_RECV_INIT))
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return -1;
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handle->iso_mode = ISO_RECV;
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handle->iso_recv_handler = handler;
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return 0;
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}
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@ -249,10 +255,10 @@ int raw1394_iso_multichannel_recv_init(raw1394handle_t handle,
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**/
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int raw1394_iso_recv_listen_channel(raw1394handle_t handle, unsigned char channel)
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{
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_recv_handler)
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if(handle->iso_mode != ISO_RECV) {
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errno = EINVAL;
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return -1;
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}
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return ioctl(handle->fd, RAW1394_ISO_RECV_LISTEN_CHANNEL, channel);
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}
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@ -262,10 +268,10 @@ int raw1394_iso_recv_listen_channel(raw1394handle_t handle, unsigned char channe
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**/
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int raw1394_iso_recv_unlisten_channel(raw1394handle_t handle, unsigned char channel)
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{
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_recv_handler)
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if(handle->iso_mode != ISO_RECV) {
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errno = EINVAL;
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return -1;
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}
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return ioctl(handle->fd, RAW1394_ISO_RECV_UNLISTEN_CHANNEL, channel);
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}
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@ -279,10 +285,10 @@ int raw1394_iso_recv_unlisten_channel(raw1394handle_t handle, unsigned char chan
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**/
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int raw1394_iso_recv_set_channel_mask(raw1394handle_t handle, u_int64_t mask)
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{
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_recv_handler)
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if(handle->iso_mode != ISO_RECV) {
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errno = EINVAL;
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return -1;
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}
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return ioctl(handle->fd, RAW1394_ISO_RECV_SET_CHANNEL_MASK, (void*) &mask);
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}
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@ -297,10 +303,10 @@ int raw1394_iso_recv_start(raw1394handle_t handle, int start_on_cycle, int tag_m
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{
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int args[3];
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_recv_handler)
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if(handle->iso_mode != ISO_RECV) {
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errno = EINVAL;
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return -1;
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}
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args[0] = start_on_cycle;
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args[1] = tag_mask;
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@ -309,6 +315,7 @@ int raw1394_iso_recv_start(raw1394handle_t handle, int start_on_cycle, int tag_m
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if(ioctl(handle->fd, RAW1394_ISO_RECV_START, &args[0]))
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return -1;
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handle->iso_state = ISO_GO;
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return 0;
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}
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@ -318,12 +325,12 @@ static int _raw1394_iso_xmit_queue_packets(raw1394handle_t handle)
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struct raw1394_iso_status *stat = &handle->iso_status;
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struct raw1394_iso_packets packets;
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int retval = -1;
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int stop_sync = 0;
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if(!handle->iso_buffer)
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goto out;
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if(!handle->iso_xmit_handler)
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if(handle->iso_mode != ISO_XMIT) {
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errno = EINVAL;
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goto out;
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}
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/* we could potentially send up to stat->n_packets packets */
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packets.n_packets = 0;
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@ -360,6 +367,12 @@ static int _raw1394_iso_xmit_queue_packets(raw1394handle_t handle)
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if(ioctl(handle->fd, RAW1394_ISO_QUEUE_ACTIVITY, 0))
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goto out_produce;
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break;
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} else if(disp == RAW1394_ISO_STOP) {
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stop_sync = 1;
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break;
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} else if(disp == RAW1394_ISO_STOP_NOSYNC) {
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raw1394_iso_stop(handle);
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break;
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} else if(disp == RAW1394_ISO_ERROR) {
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goto out_produce;
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}
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@ -375,10 +388,70 @@ out_produce:
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}
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out_free:
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free(packets.infos);
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out:
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out:
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if(stop_sync) {
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if(raw1394_iso_xmit_sync(handle))
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return -1;
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raw1394_iso_stop(handle);
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}
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return retval;
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}
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/**
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* raw1394_iso_xmit_write - alternative blocking-write API for ISO transmission
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* @data: pointer to packet data buffer
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* @len: length of packet, in bytes
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* @tag: tag field
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* @sy: sync field
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**/
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int raw1394_iso_xmit_write(raw1394handle_t handle, unsigned char *data, unsigned int len,
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unsigned char tag, unsigned char sy)
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{
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struct raw1394_iso_status *stat = &handle->iso_status;
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struct raw1394_iso_packets packets;
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struct raw1394_iso_packet_info info;
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if(handle->iso_mode != ISO_XMIT || handle->iso_xmit_handler != NULL) {
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errno = EINVAL;
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return -1;
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}
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/* wait until buffer space is available */
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while(handle->iso_status.n_packets == 0) {
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/* if the file descriptor has been set non-blocking,
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return immediately */
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if(fcntl(handle->fd, F_GETFL) & O_NONBLOCK) {
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errno = EAGAIN;
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return -1;
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}
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if(raw1394_loop_iterate(handle)) {
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return -1;
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}
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}
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/* copy the data to the packet buffer */
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info.offset = handle->next_packet * handle->iso_buf_stride;
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info.len = len;
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info.tag = tag;
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info.sy = sy;
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memcpy(handle->iso_buffer + info.offset, data, len);
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packets.n_packets = 1;
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packets.infos = &info;
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if(ioctl(handle->fd, RAW1394_ISO_XMIT_PACKETS, &packets))
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return -1;
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stat->n_packets--;
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handle->next_packet = (handle->next_packet + 1) % stat->config.buf_packets;
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if(stat->xmit_cycle != -1)
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stat->xmit_cycle = (stat->xmit_cycle + 1) % 8000;
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return 0;
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}
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/**
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* raw1394_iso_xmit_start - begin isochronous transmission
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@ -389,10 +462,10 @@ int raw1394_iso_xmit_start(raw1394handle_t handle, int start_on_cycle, int prebu
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{
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int args[2];
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_xmit_handler)
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if(handle->iso_mode != ISO_XMIT) {
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errno = EINVAL;
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return -1;
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}
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args[0] = start_on_cycle;
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args[1] = prebuffer_packets;
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@ -400,18 +473,33 @@ int raw1394_iso_xmit_start(raw1394handle_t handle, int start_on_cycle, int prebu
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if(ioctl(handle->fd, RAW1394_ISO_XMIT_START, &args[0]))
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return -1;
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handle->iso_state = ISO_GO;
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return 0;
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}
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/**
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* raw1394_iso_xmit_sync - wait until all queued packets have been sent
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**/
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int raw1394_iso_xmit_sync(raw1394handle_t handle)
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{
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if(handle->iso_mode != ISO_XMIT) {
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errno = EINVAL;
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return -1;
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}
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return ioctl(handle->fd, RAW1394_ISO_XMIT_SYNC, 0);
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}
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/**
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* raw1394_iso_stop - halt isochronous transmission or reception
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**/
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void raw1394_iso_stop(raw1394handle_t handle)
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{
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if(!handle->iso_buffer)
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if(handle->iso_mode == ISO_INACTIVE) {
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return;
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}
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ioctl(handle->fd, RAW1394_ISO_STOP, 0);
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ioctl(handle->fd, RAW1394_ISO_XMIT_RECV_STOP, 0);
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handle->iso_state = ISO_STOP;
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}
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/**
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@ -420,11 +508,16 @@ void raw1394_iso_stop(raw1394handle_t handle)
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void raw1394_iso_shutdown(raw1394handle_t handle)
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{
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if(handle->iso_buffer) {
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raw1394_iso_stop(handle);
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munmap(handle->iso_buffer, handle->iso_status.config.data_buf_size);
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ioctl(handle->fd, RAW1394_ISO_SHUTDOWN, 0);
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handle->iso_buffer = NULL;
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}
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if(handle->iso_mode != ISO_INACTIVE) {
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raw1394_iso_stop(handle);
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ioctl(handle->fd, RAW1394_ISO_SHUTDOWN, 0);
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}
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handle->iso_mode = ISO_INACTIVE;
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}
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static int _raw1394_iso_recv_packets(raw1394handle_t handle)
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@ -434,12 +527,11 @@ static int _raw1394_iso_recv_packets(raw1394handle_t handle)
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int retval = -1, packets_done = 0;
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if(!handle->iso_buffer)
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goto out;
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if(!handle->iso_recv_handler)
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goto out;
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if(handle->iso_mode != ISO_RECV) {
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errno = EINVAL;
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return -1;
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}
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/* ask the kernel to fill an array with packet info structs */
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packets.n_packets = stat->n_packets;
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packets.infos = malloc(packets.n_packets * sizeof(struct raw1394_iso_packet_info));
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@ -472,6 +564,9 @@ static int _raw1394_iso_recv_packets(raw1394handle_t handle)
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if(ioctl(handle->fd, RAW1394_ISO_QUEUE_ACTIVITY, 0))
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goto out_consume;
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break;
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} else if(disp == RAW1394_ISO_STOP || disp == RAW1394_ISO_STOP_NOSYNC) {
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raw1394_iso_stop(handle);
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break;
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} else if(disp == RAW1394_ISO_ERROR) {
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goto out_consume;
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}
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@ -496,7 +591,7 @@ int _raw1394_iso_iterate(raw1394handle_t handle)
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{
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int err;
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if(!handle->iso_buffer)
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if(handle->iso_mode == ISO_INACTIVE)
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return 0;
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err = ioctl(handle->fd, RAW1394_ISO_GET_STATUS, &handle->iso_status);
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@ -505,10 +600,18 @@ int _raw1394_iso_iterate(raw1394handle_t handle)
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handle->iso_packets_dropped += handle->iso_status.overflows;
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if(handle->iso_xmit_handler) {
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return _raw1394_iso_xmit_queue_packets(handle);
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} else if(handle->iso_recv_handler) {
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return _raw1394_iso_recv_packets(handle);
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if(handle->iso_state == ISO_GO) {
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if(handle->iso_mode == ISO_XMIT) {
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if(handle->iso_xmit_handler) {
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return _raw1394_iso_xmit_queue_packets(handle);
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}
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}
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if(handle->iso_mode == ISO_RECV) {
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if(handle->iso_recv_handler) {
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return _raw1394_iso_recv_packets(handle);
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}
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}
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}
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return 0;
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@ -122,7 +122,7 @@ typedef struct arm_request_response {
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#define RAW1394_ISO_RECV_INIT 2 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_RECV_START 3 /* arg: int[3], { starting cycle, tag, sync } */
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#define RAW1394_ISO_XMIT_START 8 /* arg: int[2], { starting cycle, prebuffer } */
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#define RAW1394_ISO_STOP 4
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#define RAW1394_ISO_XMIT_RECV_STOP 4
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#define RAW1394_ISO_GET_STATUS 5 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_PRODUCE_CONSUME 6 /* no longer used */
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#define RAW1394_ISO_SHUTDOWN 7
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@ -133,7 +133,8 @@ typedef struct arm_request_response {
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#define RAW1394_ISO_RECV_PACKETS 13 /* arg: struct raw1394_iso_packets* */
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#define RAW1394_ISO_RECV_RELEASE_PACKETS 14 /* arg: int n_packets */
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#define RAW1394_ISO_XMIT_PACKETS 15 /* arg: struct raw1394_iso_packets* */
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#define RAW1394_ISO_XMIT_SYNC 16
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/* per-packet metadata embedded in the ringbuffer */
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/* must be identical to hpsb_iso_packet_info in iso.h! */
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struct raw1394_iso_packet_info {
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@ -150,6 +150,7 @@ struct raw1394_handle *raw1394_new_handle(void)
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handle->arm_tag_handler = arm_tag_handler_default;
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memset(handle->iso_handler, 0, sizeof(handle->iso_handler));
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handle->iso_buffer = NULL;
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handle->iso_mode = ISO_INACTIVE;
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return handle;
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}
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@ -164,7 +165,7 @@ struct raw1394_handle *raw1394_new_handle(void)
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void raw1394_destroy_handle(struct raw1394_handle *handle)
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{
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if (handle) {
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if(handle->iso_buffer) {
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if(handle->iso_mode != ISO_INACTIVE) {
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raw1394_iso_shutdown(handle);
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}
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close(handle->fd);
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@ -66,6 +66,12 @@ enum raw1394_iso_disposition {
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/* return from raw1394_loop_iterate() immediately, which will return an error */
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RAW1394_ISO_ERROR = 2,
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/* return from raw1394_loop_iterate() immediately, and stop receiving packets */
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RAW1394_ISO_STOP = 3,
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/* (transmission only) - like ISO_STOP, but don't wait for the buffer to empty */
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RAW1394_ISO_STOP_NOSYNC = 4,
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};
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#ifdef __cplusplus
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@ -120,6 +126,15 @@ int raw1394_iso_recv_set_channel_mask(raw1394handle_t handle, u_int64_t mask);
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int raw1394_iso_xmit_start(raw1394handle_t handle, int start_on_cycle, int prebuffer_packets);
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int raw1394_iso_recv_start(raw1394handle_t handle, int start_on_cycle, int tag_mask, int sync);
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/* write() style API - do NOT use this if you have set an xmit_handler
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* if buffer is full, waits for more space UNLESS the file descriptor is
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* set to non-blocking, in which case xmit_write() will return -1 with errno = EAGAIN */
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int raw1394_iso_xmit_write(raw1394handle_t handle, unsigned char *data, unsigned int len,
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unsigned char tag, unsigned char sy);
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/* wait until all queued packets have been sent */
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int raw1394_iso_xmit_sync(raw1394handle_t handle);
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void raw1394_iso_stop(raw1394handle_t handle);
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void raw1394_iso_shutdown(raw1394handle_t handle);
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@ -27,6 +27,8 @@ struct raw1394_handle {
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/* memory mapping of the DMA buffer */
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unsigned char *iso_buffer;
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enum { ISO_INACTIVE, ISO_XMIT, ISO_RECV } iso_mode;
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enum { ISO_STOP, ISO_GO } iso_state;
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/* iso XMIT only: */
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unsigned int iso_buf_stride; /* offset between successive packets */
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