66  * struct hsc_channel - hsi_char internal channel data
67  * @ch: channel number
68  * @flags: Keeps state of the channel (open/close, reading, writing)
116 static void hsc_add_tail(struct hsc_channel *channel, struct hsi_msg *msg,  in hsc_add_tail()  argument
121 	spin_lock_irqsave(&channel->lock, flags);  in hsc_add_tail()
123 	spin_unlock_irqrestore(&channel->lock, flags);  in hsc_add_tail()
126 static struct hsi_msg *hsc_get_first_msg(struct hsc_channel *channel,  in hsc_get_first_msg()  argument
132 	spin_lock_irqsave(&channel->lock, flags);  in hsc_get_first_msg()
140 	spin_unlock_irqrestore(&channel->lock, flags);  in hsc_get_first_msg()
161 static void hsc_reset_list(struct hsc_channel *channel, struct list_head *l)  in hsc_reset_list()  argument
166 	spin_lock_irqsave(&channel->lock, flags);  in hsc_reset_list()
168 	spin_unlock_irqrestore(&channel->lock, flags);  in hsc_reset_list()
195 static inline int hsc_msgs_alloc(struct hsc_channel *channel)  in hsc_msgs_alloc()  argument
204 		msg->channel = channel->ch;  in hsc_msgs_alloc()
205 		list_add_tail(&msg->link, &channel->free_msgs_list);  in hsc_msgs_alloc()
210 	hsc_free_list(&channel->free_msgs_list);  in hsc_msgs_alloc()
228 	struct hsc_channel *channel = cl_data->channels + msg->channel;  in hsc_rx_completed()  local
230 	if (test_bit(HSC_CH_READ, &channel->flags)) {  in hsc_rx_completed()
231 		hsc_add_tail(channel, msg, &channel->rx_msgs_queue);  in hsc_rx_completed()
232 		wake_up(&channel->rx_wait);  in hsc_rx_completed()
234 		hsc_add_tail(channel, msg, &channel->free_msgs_list);  in hsc_rx_completed()
248 	struct hsc_channel *channel = cl_data->channels + msg->channel;  in hsc_tx_completed()  local
250 	if (test_bit(HSC_CH_WRITE, &channel->flags)) {  in hsc_tx_completed()
251 		hsc_add_tail(channel, msg, &channel->tx_msgs_queue);  in hsc_tx_completed()
252 		wake_up(&channel->tx_wait);  in hsc_tx_completed()
254 		hsc_add_tail(channel, msg, &channel->free_msgs_list);  in hsc_tx_completed()
276 	struct hsc_channel *channel = cl_data->channels;  in hsc_break_received()  local
280 	for (i = 0; i < HSC_DEVS; i++, channel++) {  in hsc_break_received()
283 		if (!test_bit(HSC_CH_READ, &channel->flags))  in hsc_break_received()
285 		msg2 = hsc_get_first_msg(channel, &channel->free_msgs_list);  in hsc_break_received()
288 		clear_bit(HSC_CH_READ, &channel->flags);  in hsc_break_received()
291 		hsc_add_tail(channel, msg2, &channel->rx_msgs_queue);  in hsc_break_received()
292 		wake_up(&channel->rx_wait);  in hsc_break_received()
415 	struct hsc_channel *channel = file->private_data;  in hsc_read()  local
425 	if (channel->ch >= channel->cl->rx_cfg.num_hw_channels)  in hsc_read()
427 	if (test_and_set_bit(HSC_CH_READ, &channel->flags))  in hsc_read()
429 	msg = hsc_get_first_msg(channel, &channel->free_msgs_list);  in hsc_read()
437 	ret = hsi_async_read(channel->cl, msg);  in hsc_read()
439 		hsc_add_tail(channel, msg, &channel->free_msgs_list);  in hsc_read()
443 	ret = wait_event_interruptible(channel->rx_wait,  in hsc_read()
444 					!list_empty(&channel->rx_msgs_queue));  in hsc_read()
446 		clear_bit(HSC_CH_READ, &channel->flags);  in hsc_read()
447 		hsi_flush(channel->cl);  in hsc_read()
451 	msg = hsc_get_first_msg(channel, &channel->rx_msgs_queue);  in hsc_read()
463 		hsc_add_tail(channel, msg, &channel->free_msgs_list);  in hsc_read()
466 	clear_bit(HSC_CH_READ, &channel->flags);  in hsc_read()
474 	struct hsc_channel *channel = file->private_data;  in hsc_write()  local
482 	if (channel->ch >= channel->cl->tx_cfg.num_hw_channels)  in hsc_write()
484 	if (test_and_set_bit(HSC_CH_WRITE, &channel->flags))  in hsc_write()
486 	msg = hsc_get_first_msg(channel, &channel->free_msgs_list);  in hsc_write()
488 		clear_bit(HSC_CH_WRITE, &channel->flags);  in hsc_write()
498 	ret = hsi_async_write(channel->cl, msg);  in hsc_write()
502 	ret = wait_event_interruptible(channel->tx_wait,  in hsc_write()
503 					!list_empty(&channel->tx_msgs_queue));  in hsc_write()
505 		clear_bit(HSC_CH_WRITE, &channel->flags);  in hsc_write()
506 		hsi_flush(channel->cl);  in hsc_write()
510 	msg = hsc_get_first_msg(channel, &channel->tx_msgs_queue);  in hsc_write()
517 		hsc_add_tail(channel, msg, &channel->free_msgs_list);  in hsc_write()
520 	clear_bit(HSC_CH_WRITE, &channel->flags);  in hsc_write()
527 	struct hsc_channel *channel = file->private_data;  in hsc_ioctl()  local
535 		hsi_flush(channel->cl);  in hsc_ioctl()
541 			if (test_and_set_bit(HSC_CH_WLINE, &channel->flags))  in hsc_ioctl()
543 			ret = hsi_start_tx(channel->cl);  in hsc_ioctl()
545 			if (!test_and_clear_bit(HSC_CH_WLINE, &channel->flags))  in hsc_ioctl()
547 			ret = hsi_stop_tx(channel->cl);  in hsc_ioctl()
553 		return hsc_break_send(channel->cl);  in hsc_ioctl()
557 		return hsc_rx_set(channel->cl, &rxc);  in hsc_ioctl()
559 		hsc_rx_get(channel->cl, &rxc);  in hsc_ioctl()
566 		return hsc_tx_set(channel->cl, &txc);  in hsc_ioctl()
568 		hsc_tx_get(channel->cl, &txc);  in hsc_ioctl()
592 	struct hsc_channel *channel;  in hsc_open()  local
599 	channel = cl_data->channels + (iminor(inode) & HSC_CH_MASK);  in hsc_open()
601 	if (test_and_set_bit(HSC_CH_OPEN, &channel->flags)) {  in hsc_open()
617 	ret = hsc_msgs_alloc(channel);  in hsc_open()
623 	file->private_data = channel;  in hsc_open()
635 	struct hsc_channel *channel = file->private_data;  in hsc_release()  local
636 	struct hsc_client_data *cl_data = channel->cl_data;  in hsc_release()
640 	if (test_and_clear_bit(HSC_CH_WLINE, &channel->flags))  in hsc_release()
641 		hsi_stop_tx(channel->cl);  in hsc_release()
643 	hsc_reset_list(channel, &channel->rx_msgs_queue);  in hsc_release()
644 	hsc_reset_list(channel, &channel->tx_msgs_queue);  in hsc_release()
645 	hsc_reset_list(channel, &channel->free_msgs_list);  in hsc_release()
646 	clear_bit(HSC_CH_READ, &channel->flags);  in hsc_release()
647 	clear_bit(HSC_CH_WRITE, &channel->flags);  in hsc_release()
648 	clear_bit(HSC_CH_OPEN, &channel->flags);  in hsc_release()
649 	wake_up(&channel->rx_wait);  in hsc_release()
650 	wake_up(&channel->tx_wait);  in hsc_release()
665 static void hsc_channel_init(struct hsc_channel *channel)  in hsc_channel_init()  argument
667 	init_waitqueue_head(&channel->rx_wait);  in hsc_channel_init()
668 	init_waitqueue_head(&channel->tx_wait);  in hsc_channel_init()
669 	spin_lock_init(&channel->lock);  in hsc_channel_init()
670 	INIT_LIST_HEAD(&channel->free_msgs_list);  in hsc_channel_init()
671 	INIT_LIST_HEAD(&channel->rx_msgs_queue);  in hsc_channel_init()
672 	INIT_LIST_HEAD(&channel->tx_msgs_queue);  in hsc_channel_init()
679 	struct hsc_channel *channel;  in hsc_probe()  local
710 	for (i = 0, channel = cl_data->channels; i < HSC_DEVS; i++, channel++) {  in hsc_probe()
711 		hsc_channel_init(channel);  in hsc_probe()
712 		channel->ch = i;  in hsc_probe()
713 		channel->cl = cl;  in hsc_probe()
714 		channel->cl_data = cl_data;  in hsc_probe()
717 	/* 1 hsi client -> N char devices (one for each channel) */  in hsc_probe()