linux/sound/usb/bcd2000/bcd2000.c
Linus Torvalds 4e4510fec4 sound updates for 4.15-rc1
There are no big surprising changes in this cycle, yet not too
 boring, either.  The biggest change from diffstat POV is the removal
 of the legacy OSS driver codes that have been already disabled for a
 long time.  This will bring a few trivial merge conflicts.
 
 As new features in ASoC side, there are two things: a new AC97 bus
 implementation and AMD Stony platform support.  Both include the
 relevant changes shared with other subsystems, e.g. AC97 MFD changes
 and DRM AMD changes.
 
 Some other highlighted topics are:
 - A bunch of USB-audio drivers got the hardening against the malicious
   device accesses with a new helper code for endpoint sanity check.
 - Lots of cleanups for ASoC Intel platform code, including support for
   their open source audio firmware.
 - Continued ASoC core componentization works.
 - Support for scaling MCLK with sample rate in ASoC simple-card.
 - Stabler PCM hot-unplug capability, especially for ASoC usages.
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Merge tag 'sound-4.15-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

Pull sound updates from Takashi Iwai:
 "There are no big surprising changes in this cycle, yet not too boring,
  either. The biggest change from diffstat POV is the removal of the
  legacy OSS driver codes that have been already disabled for a long
  time. This will bring a few trivial merge conflicts.

  As new features in ASoC side, there are two things: a new AC97 bus
  implementation and AMD Stony platform support. Both include the
  relevant changes shared with other subsystems, e.g. AC97 MFD changes
  and DRM AMD changes.

  Some other highlighted topics are:

   - A bunch of USB-audio drivers got the hardening against the
     malicious device accesses with a new helper code for endpoint
     sanity check

   - Lots of cleanups for ASoC Intel platform code, including support
     for their open source audio firmware

   - Continued ASoC core componentization works

   - Support for scaling MCLK with sample rate in ASoC simple-card

   - Stabler PCM hot-unplug capability, especially for ASoC usages"

* tag 'sound-4.15-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (302 commits)
  Documentation: sound: hd-audio: notes.rst
  ASoC: bcm2835: Support left/right justified and DSP modes
  ASoC: bcm2835: Enforce full symmetry
  ASoC: bcm2835: Support additional samplerates up to 384kHz
  ASoC: bcm2835: Add support for TDM modes
  ASoC: add mclk-fs support to audio graph card
  ASoC: add mclk-fs to audio graph card binding
  ASoC: rt5514: work around link error
  ASoC: rt5514: mark PM functions as __maybe_unused
  ASoC: rt5663: Check the JD status in the button pushing
  ASoC: amd: Modified DMA transfer Mechanism for Playback
  ASoC: rt5645: Wait for 400msec before concluding on value of RT5645_VENDOR_ID2
  ASoC: sun4i-codec: fixed 32bit audio capture support for H3/H2+
  ASoC: da7213: add support for DSP modes
  ASoC: sun8i-codec: Add a comment on the LRCK inversion
  ASoC: sun8i-codec: Set the BCLK divider
  ASoC: rt5663: Delay and retry reading rt5663 ID register
  ASoC: amd: use do_div rather than 64 bit division to fix 32 bit builds
  ASoC: cs42l56: Fix reset GPIO name in example DT binding
  ASoC: rt5514-spi: check irq status to schedule data copy in resume function
  ...
2017-11-14 18:01:46 -08:00

469 lines
12 KiB
C

/*
* Behringer BCD2000 driver
*
* Copyright (C) 2014 Mario Kicherer (dev@kicherer.org)
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/bitmap.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#define PREFIX "snd-bcd2000: "
#define BUFSIZE 64
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x1397, 0x00bd) },
{ },
};
static unsigned char device_cmd_prefix[] = {0x03, 0x00};
static unsigned char bcd2000_init_sequence[] = {
0x07, 0x00, 0x00, 0x00, 0x78, 0x48, 0x1c, 0x81,
0xc4, 0x00, 0x00, 0x00, 0x5e, 0x53, 0x4a, 0xf7,
0x18, 0xfa, 0x11, 0xff, 0x6c, 0xf3, 0x90, 0xff,
0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x18, 0xfa, 0x11, 0xff, 0x14, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xf2, 0x34, 0x4a, 0xf7,
0x18, 0xfa, 0x11, 0xff
};
struct bcd2000 {
struct usb_device *dev;
struct snd_card *card;
struct usb_interface *intf;
int card_index;
int midi_out_active;
struct snd_rawmidi *rmidi;
struct snd_rawmidi_substream *midi_receive_substream;
struct snd_rawmidi_substream *midi_out_substream;
unsigned char midi_in_buf[BUFSIZE];
unsigned char midi_out_buf[BUFSIZE];
struct urb *midi_out_urb;
struct urb *midi_in_urb;
struct usb_anchor anchor;
};
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static DEFINE_MUTEX(devices_mutex);
static DECLARE_BITMAP(devices_used, SNDRV_CARDS);
static struct usb_driver bcd2000_driver;
#ifdef CONFIG_SND_DEBUG
static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len)
{
print_hex_dump(KERN_DEBUG, prefix,
DUMP_PREFIX_NONE, 16, 1,
buf, len, false);
}
#else
static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) {}
#endif
static int bcd2000_midi_input_open(struct snd_rawmidi_substream *substream)
{
return 0;
}
static int bcd2000_midi_input_close(struct snd_rawmidi_substream *substream)
{
return 0;
}
/* (de)register midi substream from client */
static void bcd2000_midi_input_trigger(struct snd_rawmidi_substream *substream,
int up)
{
struct bcd2000 *bcd2k = substream->rmidi->private_data;
bcd2k->midi_receive_substream = up ? substream : NULL;
}
static void bcd2000_midi_handle_input(struct bcd2000 *bcd2k,
const unsigned char *buf, unsigned int buf_len)
{
unsigned int payload_length, tocopy;
struct snd_rawmidi_substream *midi_receive_substream;
midi_receive_substream = READ_ONCE(bcd2k->midi_receive_substream);
if (!midi_receive_substream)
return;
bcd2000_dump_buffer(PREFIX "received from device: ", buf, buf_len);
if (buf_len < 2)
return;
payload_length = buf[0];
/* ignore packets without payload */
if (payload_length == 0)
return;
tocopy = min(payload_length, buf_len-1);
bcd2000_dump_buffer(PREFIX "sending to userspace: ",
&buf[1], tocopy);
snd_rawmidi_receive(midi_receive_substream,
&buf[1], tocopy);
}
static void bcd2000_midi_send(struct bcd2000 *bcd2k)
{
int len, ret;
struct snd_rawmidi_substream *midi_out_substream;
BUILD_BUG_ON(sizeof(device_cmd_prefix) >= BUFSIZE);
midi_out_substream = READ_ONCE(bcd2k->midi_out_substream);
if (!midi_out_substream)
return;
/* copy command prefix bytes */
memcpy(bcd2k->midi_out_buf, device_cmd_prefix,
sizeof(device_cmd_prefix));
/*
* get MIDI packet and leave space for command prefix
* and payload length
*/
len = snd_rawmidi_transmit(midi_out_substream,
bcd2k->midi_out_buf + 3, BUFSIZE - 3);
if (len < 0)
dev_err(&bcd2k->dev->dev, "%s: snd_rawmidi_transmit error %d\n",
__func__, len);
if (len <= 0)
return;
/* set payload length */
bcd2k->midi_out_buf[2] = len;
bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE;
bcd2000_dump_buffer(PREFIX "sending to device: ",
bcd2k->midi_out_buf, len+3);
/* send packet to the BCD2000 */
ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC);
if (ret < 0)
dev_err(&bcd2k->dev->dev, PREFIX
"%s (%p): usb_submit_urb() failed, ret=%d, len=%d\n",
__func__, midi_out_substream, ret, len);
else
bcd2k->midi_out_active = 1;
}
static int bcd2000_midi_output_open(struct snd_rawmidi_substream *substream)
{
return 0;
}
static int bcd2000_midi_output_close(struct snd_rawmidi_substream *substream)
{
struct bcd2000 *bcd2k = substream->rmidi->private_data;
if (bcd2k->midi_out_active) {
usb_kill_urb(bcd2k->midi_out_urb);
bcd2k->midi_out_active = 0;
}
return 0;
}
/* (de)register midi substream from client */
static void bcd2000_midi_output_trigger(struct snd_rawmidi_substream *substream,
int up)
{
struct bcd2000 *bcd2k = substream->rmidi->private_data;
if (up) {
bcd2k->midi_out_substream = substream;
/* check if there is data userspace wants to send */
if (!bcd2k->midi_out_active)
bcd2000_midi_send(bcd2k);
} else {
bcd2k->midi_out_substream = NULL;
}
}
static void bcd2000_output_complete(struct urb *urb)
{
struct bcd2000 *bcd2k = urb->context;
bcd2k->midi_out_active = 0;
if (urb->status)
dev_warn(&urb->dev->dev,
PREFIX "output urb->status: %d\n", urb->status);
if (urb->status == -ESHUTDOWN)
return;
/* check if there is more data userspace wants to send */
bcd2000_midi_send(bcd2k);
}
static void bcd2000_input_complete(struct urb *urb)
{
int ret;
struct bcd2000 *bcd2k = urb->context;
if (urb->status)
dev_warn(&urb->dev->dev,
PREFIX "input urb->status: %i\n", urb->status);
if (!bcd2k || urb->status == -ESHUTDOWN)
return;
if (urb->actual_length > 0)
bcd2000_midi_handle_input(bcd2k, urb->transfer_buffer,
urb->actual_length);
/* return URB to device */
ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC);
if (ret < 0)
dev_err(&bcd2k->dev->dev, PREFIX
"%s: usb_submit_urb() failed, ret=%d\n",
__func__, ret);
}
static const struct snd_rawmidi_ops bcd2000_midi_output = {
.open = bcd2000_midi_output_open,
.close = bcd2000_midi_output_close,
.trigger = bcd2000_midi_output_trigger,
};
static const struct snd_rawmidi_ops bcd2000_midi_input = {
.open = bcd2000_midi_input_open,
.close = bcd2000_midi_input_close,
.trigger = bcd2000_midi_input_trigger,
};
static void bcd2000_init_device(struct bcd2000 *bcd2k)
{
int ret;
init_usb_anchor(&bcd2k->anchor);
usb_anchor_urb(bcd2k->midi_out_urb, &bcd2k->anchor);
usb_anchor_urb(bcd2k->midi_in_urb, &bcd2k->anchor);
/* copy init sequence into buffer */
memcpy(bcd2k->midi_out_buf, bcd2000_init_sequence, 52);
bcd2k->midi_out_urb->transfer_buffer_length = 52;
/* submit sequence */
ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_KERNEL);
if (ret < 0)
dev_err(&bcd2k->dev->dev, PREFIX
"%s: usb_submit_urb() out failed, ret=%d: ",
__func__, ret);
else
bcd2k->midi_out_active = 1;
/* pass URB to device to enable button and controller events */
ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_KERNEL);
if (ret < 0)
dev_err(&bcd2k->dev->dev, PREFIX
"%s: usb_submit_urb() in failed, ret=%d: ",
__func__, ret);
/* ensure initialization is finished */
usb_wait_anchor_empty_timeout(&bcd2k->anchor, 1000);
}
static int bcd2000_init_midi(struct bcd2000 *bcd2k)
{
int ret;
struct snd_rawmidi *rmidi;
ret = snd_rawmidi_new(bcd2k->card, bcd2k->card->shortname, 0,
1, /* output */
1, /* input */
&rmidi);
if (ret < 0)
return ret;
strlcpy(rmidi->name, bcd2k->card->shortname, sizeof(rmidi->name));
rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
rmidi->private_data = bcd2k;
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
&bcd2000_midi_output);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
&bcd2000_midi_input);
bcd2k->rmidi = rmidi;
bcd2k->midi_in_urb = usb_alloc_urb(0, GFP_KERNEL);
bcd2k->midi_out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!bcd2k->midi_in_urb || !bcd2k->midi_out_urb) {
dev_err(&bcd2k->dev->dev, PREFIX "usb_alloc_urb failed\n");
return -ENOMEM;
}
usb_fill_int_urb(bcd2k->midi_in_urb, bcd2k->dev,
usb_rcvintpipe(bcd2k->dev, 0x81),
bcd2k->midi_in_buf, BUFSIZE,
bcd2000_input_complete, bcd2k, 1);
usb_fill_int_urb(bcd2k->midi_out_urb, bcd2k->dev,
usb_sndintpipe(bcd2k->dev, 0x1),
bcd2k->midi_out_buf, BUFSIZE,
bcd2000_output_complete, bcd2k, 1);
/* sanity checks of EPs before actually submitting */
if (usb_urb_ep_type_check(bcd2k->midi_in_urb) ||
usb_urb_ep_type_check(bcd2k->midi_out_urb)) {
dev_err(&bcd2k->dev->dev, "invalid MIDI EP\n");
return -EINVAL;
}
bcd2000_init_device(bcd2k);
return 0;
}
static void bcd2000_free_usb_related_resources(struct bcd2000 *bcd2k,
struct usb_interface *interface)
{
/* usb_kill_urb not necessary, urb is aborted automatically */
usb_free_urb(bcd2k->midi_out_urb);
usb_free_urb(bcd2k->midi_in_urb);
if (bcd2k->intf) {
usb_set_intfdata(bcd2k->intf, NULL);
bcd2k->intf = NULL;
}
}
static int bcd2000_probe(struct usb_interface *interface,
const struct usb_device_id *usb_id)
{
struct snd_card *card;
struct bcd2000 *bcd2k;
unsigned int card_index;
char usb_path[32];
int err;
mutex_lock(&devices_mutex);
for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
if (!test_bit(card_index, devices_used))
break;
if (card_index >= SNDRV_CARDS) {
mutex_unlock(&devices_mutex);
return -ENOENT;
}
err = snd_card_new(&interface->dev, index[card_index], id[card_index],
THIS_MODULE, sizeof(*bcd2k), &card);
if (err < 0) {
mutex_unlock(&devices_mutex);
return err;
}
bcd2k = card->private_data;
bcd2k->dev = interface_to_usbdev(interface);
bcd2k->card = card;
bcd2k->card_index = card_index;
bcd2k->intf = interface;
snd_card_set_dev(card, &interface->dev);
strncpy(card->driver, "snd-bcd2000", sizeof(card->driver));
strncpy(card->shortname, "BCD2000", sizeof(card->shortname));
usb_make_path(bcd2k->dev, usb_path, sizeof(usb_path));
snprintf(bcd2k->card->longname, sizeof(bcd2k->card->longname),
"Behringer BCD2000 at %s",
usb_path);
err = bcd2000_init_midi(bcd2k);
if (err < 0)
goto probe_error;
err = snd_card_register(card);
if (err < 0)
goto probe_error;
usb_set_intfdata(interface, bcd2k);
set_bit(card_index, devices_used);
mutex_unlock(&devices_mutex);
return 0;
probe_error:
dev_info(&bcd2k->dev->dev, PREFIX "error during probing");
bcd2000_free_usb_related_resources(bcd2k, interface);
snd_card_free(card);
mutex_unlock(&devices_mutex);
return err;
}
static void bcd2000_disconnect(struct usb_interface *interface)
{
struct bcd2000 *bcd2k = usb_get_intfdata(interface);
if (!bcd2k)
return;
mutex_lock(&devices_mutex);
/* make sure that userspace cannot create new requests */
snd_card_disconnect(bcd2k->card);
bcd2000_free_usb_related_resources(bcd2k, interface);
clear_bit(bcd2k->card_index, devices_used);
snd_card_free_when_closed(bcd2k->card);
mutex_unlock(&devices_mutex);
}
static struct usb_driver bcd2000_driver = {
.name = "snd-bcd2000",
.probe = bcd2000_probe,
.disconnect = bcd2000_disconnect,
.id_table = id_table,
};
module_usb_driver(bcd2000_driver);
MODULE_DEVICE_TABLE(usb, id_table);
MODULE_AUTHOR("Mario Kicherer, dev@kicherer.org");
MODULE_DESCRIPTION("Behringer BCD2000 driver");
MODULE_LICENSE("GPL");