/*
 * Line 6 Linux USB driver
 *
 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
 *
 *	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, version 2.
 *
 */

#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "capture.h"
#include "driver.h"
#include "pcm.h"

/*
	Find a free URB and submit it.
	must be called in line6pcm->in.lock context
*/
static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
{
	int index;
	int i, urb_size;
	int ret;
	struct urb *urb_in;

	index = find_first_zero_bit(&line6pcm->in.active_urbs,
				    line6pcm->line6->iso_buffers);

	if (index < 0 || index >= line6pcm->line6->iso_buffers) {
		dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
		return -EINVAL;
	}

	urb_in = line6pcm->in.urbs[index];
	urb_size = 0;

	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
		struct usb_iso_packet_descriptor *fin =
		    &urb_in->iso_frame_desc[i];
		fin->offset = urb_size;
		fin->length = line6pcm->max_packet_size_in;
		urb_size += line6pcm->max_packet_size_in;
	}

	urb_in->transfer_buffer =
	    line6pcm->in.buffer +
	    index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_in;
	urb_in->transfer_buffer_length = urb_size;
	urb_in->context = line6pcm;

	ret = usb_submit_urb(urb_in, GFP_ATOMIC);

	if (ret == 0)
		set_bit(index, &line6pcm->in.active_urbs);
	else
		dev_err(line6pcm->line6->ifcdev,
			"URB in #%d submission failed (%d)\n", index, ret);

	return 0;
}

/*
	Submit all currently available capture URBs.
	must be called in line6pcm->in.lock context
*/
int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
{
	int ret = 0, i;

	for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
		ret = submit_audio_in_urb(line6pcm);
		if (ret < 0)
			break;
	}

	return ret;
}

/*
	Copy data into ALSA capture buffer.
*/
void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
{
	struct snd_pcm_substream *substream =
	    get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
	struct snd_pcm_runtime *runtime = substream->runtime;
	const int bytes_per_frame =
		line6pcm->properties->bytes_per_channel *
		line6pcm->properties->capture_hw.channels_max;
	int frames = fsize / bytes_per_frame;

	if (runtime == NULL)
		return;

	if (line6pcm->in.pos_done + frames > runtime->buffer_size) {
		/*
		   The transferred area goes over buffer boundary,
		   copy two separate chunks.
		 */
		int len;

		len = runtime->buffer_size - line6pcm->in.pos_done;

		if (len > 0) {
			memcpy(runtime->dma_area +
			       line6pcm->in.pos_done * bytes_per_frame, fbuf,
			       len * bytes_per_frame);
			memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
			       (frames - len) * bytes_per_frame);
		} else {
			/* this is somewhat paranoid */
			dev_err(line6pcm->line6->ifcdev,
				"driver bug: len = %d\n", len);
		}
	} else {
		/* copy single chunk */
		memcpy(runtime->dma_area +
		       line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize);
	}

	line6pcm->in.pos_done += frames;
	if (line6pcm->in.pos_done >= runtime->buffer_size)
		line6pcm->in.pos_done -= runtime->buffer_size;
}

void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
{
	struct snd_pcm_substream *substream =
	    get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);

	line6pcm->in.bytes += length;
	if (line6pcm->in.bytes >= line6pcm->in.period) {
		line6pcm->in.bytes %= line6pcm->in.period;
		spin_unlock(&line6pcm->in.lock);
		snd_pcm_period_elapsed(substream);
		spin_lock(&line6pcm->in.lock);
	}
}

/*
 * Callback for completed capture URB.
 */
static void audio_in_callback(struct urb *urb)
{
	int i, index, length = 0, shutdown = 0;
	unsigned long flags;

	struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;

	line6pcm->in.last_frame = urb->start_frame;

	/* find index of URB */
	for (index = 0; index < line6pcm->line6->iso_buffers; ++index)
		if (urb == line6pcm->in.urbs[index])
			break;

	spin_lock_irqsave(&line6pcm->in.lock, flags);

	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
		char *fbuf;
		int fsize;
		struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];

		if (fin->status == -EXDEV) {
			shutdown = 1;
			break;
		}

		fbuf = urb->transfer_buffer + fin->offset;
		fsize = fin->actual_length;

		if (fsize > line6pcm->max_packet_size_in) {
			dev_err(line6pcm->line6->ifcdev,
				"driver and/or device bug: packet too large (%d > %d)\n",
				fsize, line6pcm->max_packet_size_in);
		}

		length += fsize;

		BUILD_BUG_ON_MSG(LINE6_ISO_PACKETS != 1,
			"The following code assumes LINE6_ISO_PACKETS == 1");
		/* TODO:
		 * Also, if iso_buffers != 2, the prev frame is almost random at
		 * playback side.
		 * This needs to be redesigned. It should be "stable", but we may
		 * experience sync problems on such high-speed configs.
		 */

		line6pcm->prev_fbuf = fbuf;
		line6pcm->prev_fsize = fsize /
			(line6pcm->properties->bytes_per_channel *
			line6pcm->properties->capture_hw.channels_max);

		if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
		    test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) &&
		    fsize > 0)
			line6_capture_copy(line6pcm, fbuf, fsize);
	}

	clear_bit(index, &line6pcm->in.active_urbs);

	if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs))
		shutdown = 1;

	if (!shutdown) {
		submit_audio_in_urb(line6pcm);

		if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
		    test_bit(LINE6_STREAM_PCM, &line6pcm->in.running))
			line6_capture_check_period(line6pcm, length);
	}

	spin_unlock_irqrestore(&line6pcm->in.lock, flags);
}

/* open capture callback */
static int snd_line6_capture_open(struct snd_pcm_substream *substream)
{
	int err;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);

	err = snd_pcm_hw_constraint_ratdens(runtime, 0,
					    SNDRV_PCM_HW_PARAM_RATE,
					    &line6pcm->properties->rates);
	if (err < 0)
		return err;

	line6_pcm_acquire(line6pcm, LINE6_STREAM_CAPTURE_HELPER, false);

	runtime->hw = line6pcm->properties->capture_hw;
	return 0;
}

/* close capture callback */
static int snd_line6_capture_close(struct snd_pcm_substream *substream)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);

	line6_pcm_release(line6pcm, LINE6_STREAM_CAPTURE_HELPER);
	return 0;
}

/* capture operators */
struct snd_pcm_ops snd_line6_capture_ops = {
	.open = snd_line6_capture_open,
	.close = snd_line6_capture_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_line6_hw_params,
	.hw_free = snd_line6_hw_free,
	.prepare = snd_line6_prepare,
	.trigger = snd_line6_trigger,
	.pointer = snd_line6_pointer,
};

int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
	struct usb_line6 *line6 = line6pcm->line6;
	int i;

	line6pcm->in.urbs = kzalloc(
		sizeof(struct urb *) * line6->iso_buffers, GFP_KERNEL);
	if (line6pcm->in.urbs == NULL)
		return -ENOMEM;

	/* create audio URBs and fill in constant values: */
	for (i = 0; i < line6->iso_buffers; ++i) {
		struct urb *urb;

		/* URB for audio in: */
		urb = line6pcm->in.urbs[i] =
		    usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);

		if (urb == NULL)
			return -ENOMEM;

		urb->dev = line6->usbdev;
		urb->pipe =
		    usb_rcvisocpipe(line6->usbdev,
				    line6->properties->ep_audio_r &
				    USB_ENDPOINT_NUMBER_MASK);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->start_frame = -1;
		urb->number_of_packets = LINE6_ISO_PACKETS;
		urb->interval = LINE6_ISO_INTERVAL;
		urb->error_count = 0;
		urb->complete = audio_in_callback;
	}

	return 0;
}
ix various bugs in legacy IRQ fallback handling in alx driver, from
    Tobias Regnery.

13) Do not allow lwtunnel drivers to be unloaded while they are
    referenced by active instances, from Robert Shearman.

14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven.

15) Fix a few regressions from virtio_net XDP support, from John
    Fastabend and Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits)
  ISDN: eicon: silence misleading array-bounds warning
  net: phy: micrel: add support for KSZ8795
  gtp: fix cross netns recv on gtp socket
  gtp: clear DF bit on GTP packet tx
  gtp: add genl family modules alias
  tcp: don't annotate mark on control socket from tcp_v6_send_response()
  ravb: unmap descriptors when freeing rings
  virtio_net: reject XDP programs using header adjustment
  virtio_net: use dev_kfree_skb for small buffer XDP receive
  r8152: check rx after napi is enabled
  r8152: re-schedule napi for tx
  r8152: avoid start_xmit to schedule napi when napi is disabled
  r8152: avoid start_xmit to call napi_schedule during autosuspend
  net: dsa: Bring back device detaching in dsa_slave_suspend()
  net: phy: leds: Fix truncated LED trigger names
  net: phy: leds: Break dependency of phy.h on phy_led_triggers.h
  net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash
  net-next: ethernet: mediatek: change the compatible string
  Documentation: devicetree: change the mediatek ethernet compatible string
  bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>Diffstat</a> (limited to 'drivers/usb/host/uhci-grlib.c')</div><table summary='diffstat' class='diffstat'>