Add M2Tech hiFace USB-SPDIF driver
authorAntonio Ospite <ao2@amarulasolutions.com>
Fri, 21 Jun 2013 22:14:46 +0000 (00:14 +0200)
committerTakashi Iwai <tiwai@suse.de>
Mon, 24 Jun 2013 07:26:08 +0000 (09:26 +0200)
Add driver for M2Tech hiFace USB-SPDIF interface and compatible devices.

M2Tech hiFace and compatible devices offer a Hi-End S/PDIF Output
Interface, see http://www.m2tech.biz/hiface.html

The supported products are:

  * M2Tech Young
  * M2Tech hiFace
  * M2Tech North Star
  * M2Tech W4S Young
  * M2Tech Corrson
  * M2Tech AUDIA
  * M2Tech SL Audio
  * M2Tech Empirical
  * M2Tech Rockna
  * M2Tech Pathos
  * M2Tech Metronome
  * M2Tech CAD
  * M2Tech Audio Esclusive
  * M2Tech Rotel
  * M2Tech Eeaudio
  * The Chord Company CHORD
  * AVA Group A/S Vitus

Signed-off-by: Antonio Ospite <ao2@amarulasolutions.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/Kconfig
sound/usb/Makefile
sound/usb/hiface/Makefile [new file with mode: 0644]
sound/usb/hiface/chip.c [new file with mode: 0644]
sound/usb/hiface/chip.h [new file with mode: 0644]
sound/usb/hiface/pcm.c [new file with mode: 0644]
sound/usb/hiface/pcm.h [new file with mode: 0644]

index 225dfd737265411bead537f7f839b75863432e51..de9408b83f7577b22071aac72b1ecf0390522d44 100644 (file)
@@ -115,5 +115,36 @@ config SND_USB_6FIRE
           and further help can be found at
           http://sixfireusb.sourceforge.net
 
+config SND_USB_HIFACE
+        tristate "M2Tech hiFace USB-SPDIF driver"
+        select SND_PCM
+        help
+         Select this option to include support for M2Tech hiFace USB-SPDIF
+         interface.
+
+         This driver supports the original M2Tech hiFace and some other
+         compatible devices. The supported products are:
+
+           * M2Tech Young
+           * M2Tech hiFace
+           * M2Tech North Star
+           * M2Tech W4S Young
+           * M2Tech Corrson
+           * M2Tech AUDIA
+           * M2Tech SL Audio
+           * M2Tech Empirical
+           * M2Tech Rockna
+           * M2Tech Pathos
+           * M2Tech Metronome
+           * M2Tech CAD
+           * M2Tech Audio Esclusive
+           * M2Tech Rotel
+           * M2Tech Eeaudio
+           * The Chord Company CHORD
+           * AVA Group A/S Vitus
+
+         To compile this driver as a module, choose M here: the module
+         will be called snd-usb-hiface.
+
 endif  # SND_USB
 
index ac256dc4c6bed1d0b4d4008c58f544f50ec04085..abe668f660d16eb997950a692512f48638d152fb 100644 (file)
@@ -23,4 +23,4 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o
 obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o
 obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o
 
-obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/
+obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/
diff --git a/sound/usb/hiface/Makefile b/sound/usb/hiface/Makefile
new file mode 100644 (file)
index 0000000..463b136
--- /dev/null
@@ -0,0 +1,2 @@
+snd-usb-hiface-objs := chip.o pcm.o
+obj-$(CONFIG_SND_USB_HIFACE) += snd-usb-hiface.o
diff --git a/sound/usb/hiface/chip.c b/sound/usb/hiface/chip.c
new file mode 100644 (file)
index 0000000..b0dcb39
--- /dev/null
@@ -0,0 +1,297 @@
+/*
+ * Linux driver for M2Tech hiFace compatible devices
+ *
+ * Copyright 2012-2013 (C) M2TECH S.r.l and Amarula Solutions B.V.
+ *
+ * Authors:  Michael Trimarchi <michael@amarulasolutions.com>
+ *           Antonio Ospite <ao2@amarulasolutions.com>
+ *
+ * The driver is based on the work done in TerraTec DMX 6Fire USB
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <sound/initval.h>
+
+#include "chip.h"
+#include "pcm.h"
+
+MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
+MODULE_AUTHOR("Antonio Ospite <ao2@amarulasolutions.com>");
+MODULE_DESCRIPTION("M2Tech hiFace USB-SPDIF audio driver");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("{{M2Tech,Young},"
+                        "{M2Tech,hiFace},"
+                        "{M2Tech,North Star},"
+                        "{M2Tech,W4S Young},"
+                        "{M2Tech,Corrson},"
+                        "{M2Tech,AUDIA},"
+                        "{M2Tech,SL Audio},"
+                        "{M2Tech,Empirical},"
+                        "{M2Tech,Rockna},"
+                        "{M2Tech,Pathos},"
+                        "{M2Tech,Metronome},"
+                        "{M2Tech,CAD},"
+                        "{M2Tech,Audio Esclusive},"
+                        "{M2Tech,Rotel},"
+                        "{M2Tech,Eeaudio},"
+                        "{The Chord Company,CHORD},"
+                        "{AVA Group A/S,Vitus}}");
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-max */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* Id for card */
+static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; /* Enable this card */
+
+#define DRIVER_NAME "snd-usb-hiface"
+#define CARD_NAME "hiFace"
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
+
+static DEFINE_MUTEX(register_mutex);
+
+struct hiface_vendor_quirk {
+       const char *device_name;
+       u8 extra_freq;
+};
+
+static int hiface_chip_create(struct usb_device *device, int idx,
+                             const struct hiface_vendor_quirk *quirk,
+                             struct hiface_chip **rchip)
+{
+       struct snd_card *card = NULL;
+       struct hiface_chip *chip;
+       int ret;
+       int len;
+
+       *rchip = NULL;
+
+       /* if we are here, card can be registered in alsa. */
+       ret = snd_card_create(index[idx], id[idx], THIS_MODULE, sizeof(*chip), &card);
+       if (ret < 0) {
+               dev_err(&device->dev, "cannot create alsa card.\n");
+               return ret;
+       }
+
+       strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
+
+       if (quirk && quirk->device_name)
+               strlcpy(card->shortname, quirk->device_name, sizeof(card->shortname));
+       else
+               strlcpy(card->shortname, "M2Tech generic audio", sizeof(card->shortname));
+
+       strlcat(card->longname, card->shortname, sizeof(card->longname));
+       len = strlcat(card->longname, " at ", sizeof(card->longname));
+       if (len < sizeof(card->longname))
+               usb_make_path(device, card->longname + len,
+                             sizeof(card->longname) - len);
+
+       chip = card->private_data;
+       chip->dev = device;
+       chip->card = card;
+
+       *rchip = chip;
+       return 0;
+}
+
+static int hiface_chip_probe(struct usb_interface *intf,
+                            const struct usb_device_id *usb_id)
+{
+       const struct hiface_vendor_quirk *quirk = (struct hiface_vendor_quirk *)usb_id->driver_info;
+       int ret;
+       int i;
+       struct hiface_chip *chip;
+       struct usb_device *device = interface_to_usbdev(intf);
+
+       ret = usb_set_interface(device, 0, 0);
+       if (ret != 0) {
+               dev_err(&device->dev, "can't set first interface for " CARD_NAME " device.\n");
+               return -EIO;
+       }
+
+       /* check whether the card is already registered */
+       chip = NULL;
+       mutex_lock(&register_mutex);
+
+       for (i = 0; i < SNDRV_CARDS; i++)
+               if (enable[i])
+                       break;
+
+       if (i >= SNDRV_CARDS) {
+               dev_err(&device->dev, "no available " CARD_NAME " audio device\n");
+               ret = -ENODEV;
+               goto err;
+       }
+
+       ret = hiface_chip_create(device, i, quirk, &chip);
+       if (ret < 0)
+               goto err;
+
+       snd_card_set_dev(chip->card, &intf->dev);
+
+       ret = hiface_pcm_init(chip, quirk ? quirk->extra_freq : 0);
+       if (ret < 0)
+               goto err_chip_destroy;
+
+       ret = snd_card_register(chip->card);
+       if (ret < 0) {
+               dev_err(&device->dev, "cannot register " CARD_NAME " card\n");
+               goto err_chip_destroy;
+       }
+
+       mutex_unlock(&register_mutex);
+
+       usb_set_intfdata(intf, chip);
+       return 0;
+
+err_chip_destroy:
+       snd_card_free(chip->card);
+err:
+       mutex_unlock(&register_mutex);
+       return ret;
+}
+
+static void hiface_chip_disconnect(struct usb_interface *intf)
+{
+       struct hiface_chip *chip;
+       struct snd_card *card;
+
+       chip = usb_get_intfdata(intf);
+       if (!chip)
+               return;
+
+       card = chip->card;
+
+       /* Make sure that the userspace cannot create new request */
+       snd_card_disconnect(card);
+
+       hiface_pcm_abort(chip);
+       snd_card_free_when_closed(card);
+}
+
+static const struct usb_device_id device_table[] = {
+       {
+               USB_DEVICE(0x04b4, 0x0384),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Young",
+                       .extra_freq = 1,
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x930b),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "hiFace",
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x931b),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "North Star",
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x931c),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "W4S Young",
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x931d),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Corrson",
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x931e),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "AUDIA",
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x931f),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "SL Audio",
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x9320),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Empirical",
+               }
+       },
+       {
+               USB_DEVICE(0x04b4, 0x9321),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Rockna",
+               }
+       },
+       {
+               USB_DEVICE(0x249c, 0x9001),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Pathos",
+               }
+       },
+       {
+               USB_DEVICE(0x249c, 0x9002),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Metronome",
+               }
+       },
+       {
+               USB_DEVICE(0x249c, 0x9006),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "CAD",
+               }
+       },
+       {
+               USB_DEVICE(0x249c, 0x9008),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Audio Esclusive",
+               }
+       },
+       {
+               USB_DEVICE(0x249c, 0x931c),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Rotel",
+               }
+       },
+       {
+               USB_DEVICE(0x249c, 0x932c),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Eeaudio",
+               }
+       },
+       {
+               USB_DEVICE(0x245f, 0x931c),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "CHORD",
+               }
+       },
+       {
+               USB_DEVICE(0x25c6, 0x9002),
+               .driver_info = (unsigned long)&(const struct hiface_vendor_quirk) {
+                       .device_name = "Vitus",
+               }
+       },
+       {}
+};
+
+MODULE_DEVICE_TABLE(usb, device_table);
+
+static struct usb_driver hiface_usb_driver = {
+       .name = DRIVER_NAME,
+       .probe = hiface_chip_probe,
+       .disconnect = hiface_chip_disconnect,
+       .id_table = device_table,
+};
+
+module_usb_driver(hiface_usb_driver);
diff --git a/sound/usb/hiface/chip.h b/sound/usb/hiface/chip.h
new file mode 100644 (file)
index 0000000..189a137
--- /dev/null
@@ -0,0 +1,30 @@
+/*
+ * Linux driver for M2Tech hiFace compatible devices
+ *
+ * Copyright 2012-2013 (C) M2TECH S.r.l and Amarula Solutions B.V.
+ *
+ * Authors:  Michael Trimarchi <michael@amarulasolutions.com>
+ *           Antonio Ospite <ao2@amarulasolutions.com>
+ *
+ * The driver is based on the work done in TerraTec DMX 6Fire USB
+ *
+ * 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.
+ */
+
+#ifndef HIFACE_CHIP_H
+#define HIFACE_CHIP_H
+
+#include <linux/usb.h>
+#include <sound/core.h>
+
+struct pcm_runtime;
+
+struct hiface_chip {
+       struct usb_device *dev;
+       struct snd_card *card;
+       struct pcm_runtime *pcm;
+};
+#endif /* HIFACE_CHIP_H */
diff --git a/sound/usb/hiface/pcm.c b/sound/usb/hiface/pcm.c
new file mode 100644 (file)
index 0000000..6430ed2
--- /dev/null
@@ -0,0 +1,621 @@
+/*
+ * Linux driver for M2Tech hiFace compatible devices
+ *
+ * Copyright 2012-2013 (C) M2TECH S.r.l and Amarula Solutions B.V.
+ *
+ * Authors:  Michael Trimarchi <michael@amarulasolutions.com>
+ *           Antonio Ospite <ao2@amarulasolutions.com>
+ *
+ * The driver is based on the work done in TerraTec DMX 6Fire USB
+ *
+ * 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.
+ */
+
+#include <linux/slab.h>
+#include <sound/pcm.h>
+
+#include "pcm.h"
+#include "chip.h"
+
+#define OUT_EP          0x2
+#define PCM_N_URBS      8
+#define PCM_PACKET_SIZE 4096
+#define PCM_BUFFER_SIZE (2 * PCM_N_URBS * PCM_PACKET_SIZE)
+
+struct pcm_urb {
+       struct hiface_chip *chip;
+
+       struct urb instance;
+       struct usb_anchor submitted;
+       u8 *buffer;
+};
+
+struct pcm_substream {
+       spinlock_t lock;
+       struct snd_pcm_substream *instance;
+
+       bool active;
+       snd_pcm_uframes_t dma_off;    /* current position in alsa dma_area */
+       snd_pcm_uframes_t period_off; /* current position in current period */
+};
+
+enum { /* pcm streaming states */
+       STREAM_DISABLED, /* no pcm streaming */
+       STREAM_STARTING, /* pcm streaming requested, waiting to become ready */
+       STREAM_RUNNING,  /* pcm streaming running */
+       STREAM_STOPPING
+};
+
+struct pcm_runtime {
+       struct hiface_chip *chip;
+       struct snd_pcm *instance;
+
+       struct pcm_substream playback;
+       bool panic; /* if set driver won't do anymore pcm on device */
+
+       struct pcm_urb out_urbs[PCM_N_URBS];
+
+       struct mutex stream_mutex;
+       u8 stream_state; /* one of STREAM_XXX */
+       u8 extra_freq;
+       wait_queue_head_t stream_wait_queue;
+       bool stream_wait_cond;
+};
+
+static const unsigned int rates[] = { 44100, 48000, 88200, 96000, 176400, 192000,
+                                     352800, 384000 };
+static const struct snd_pcm_hw_constraint_list constraints_extra_rates = {
+       .count = ARRAY_SIZE(rates),
+       .list = rates,
+       .mask = 0,
+};
+
+static const struct snd_pcm_hardware pcm_hw = {
+       .info = SNDRV_PCM_INFO_MMAP |
+               SNDRV_PCM_INFO_INTERLEAVED |
+               SNDRV_PCM_INFO_BLOCK_TRANSFER |
+               SNDRV_PCM_INFO_PAUSE |
+               SNDRV_PCM_INFO_MMAP_VALID |
+               SNDRV_PCM_INFO_BATCH,
+
+       .formats = SNDRV_PCM_FMTBIT_S32_LE,
+
+       .rates = SNDRV_PCM_RATE_44100 |
+               SNDRV_PCM_RATE_48000 |
+               SNDRV_PCM_RATE_88200 |
+               SNDRV_PCM_RATE_96000 |
+               SNDRV_PCM_RATE_176400 |
+               SNDRV_PCM_RATE_192000,
+
+       .rate_min = 44100,
+       .rate_max = 192000, /* changes in hiface_pcm_open to support extra rates */
+       .channels_min = 2,
+       .channels_max = 2,
+       .buffer_bytes_max = PCM_BUFFER_SIZE,
+       .period_bytes_min = PCM_PACKET_SIZE,
+       .period_bytes_max = PCM_BUFFER_SIZE,
+       .periods_min = 2,
+       .periods_max = 1024
+};
+
+/* message values used to change the sample rate */
+#define HIFACE_SET_RATE_REQUEST 0xb0
+
+#define HIFACE_RATE_44100  0x43
+#define HIFACE_RATE_48000  0x4b
+#define HIFACE_RATE_88200  0x42
+#define HIFACE_RATE_96000  0x4a
+#define HIFACE_RATE_176400 0x40
+#define HIFACE_RATE_192000 0x48
+#define HIFACE_RATE_352000 0x58
+#define HIFACE_RATE_384000 0x68
+
+static int hiface_pcm_set_rate(struct pcm_runtime *rt, unsigned int rate)
+{
+       struct usb_device *device = rt->chip->dev;
+       u16 rate_value;
+       int ret;
+
+       /* We are already sure that the rate is supported here thanks to
+        * ALSA constraints
+        */
+       switch (rate) {
+       case 44100:
+               rate_value = HIFACE_RATE_44100;
+               break;
+       case 48000:
+               rate_value = HIFACE_RATE_48000;
+               break;
+       case 88200:
+               rate_value = HIFACE_RATE_88200;
+               break;
+       case 96000:
+               rate_value = HIFACE_RATE_96000;
+               break;
+       case 176400:
+               rate_value = HIFACE_RATE_176400;
+               break;
+       case 192000:
+               rate_value = HIFACE_RATE_192000;
+               break;
+       case 352000:
+               rate_value = HIFACE_RATE_352000;
+               break;
+       case 384000:
+               rate_value = HIFACE_RATE_384000;
+               break;
+       default:
+               dev_err(&device->dev, "Unsupported rate %d\n", rate);
+               return -EINVAL;
+       }
+
+       /*
+        * USBIO: Vendor 0xb0(wValue=0x0043, wIndex=0x0000)
+        * 43 b0 43 00 00 00 00 00
+        * USBIO: Vendor 0xb0(wValue=0x004b, wIndex=0x0000)
+        * 43 b0 4b 00 00 00 00 00
+        * This control message doesn't have any ack from the
+        * other side
+        */
+       ret = usb_control_msg(device, usb_sndctrlpipe(device, 0),
+                             HIFACE_SET_RATE_REQUEST,
+                             USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
+                             rate_value, 0, NULL, 0, 100);
+       if (ret < 0) {
+               dev_err(&device->dev, "Error setting samplerate %d.\n", rate);
+               return ret;
+       }
+
+       return 0;
+}
+
+static struct pcm_substream *hiface_pcm_get_substream(struct snd_pcm_substream
+                                                     *alsa_sub)
+{
+       struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
+       struct device *device = &rt->chip->dev->dev;
+
+       if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               return &rt->playback;
+
+       dev_err(device, "Error getting pcm substream slot.\n");
+       return NULL;
+}
+
+/* call with stream_mutex locked */
+static void hiface_pcm_stream_stop(struct pcm_runtime *rt)
+{
+       int i, time;
+
+       if (rt->stream_state != STREAM_DISABLED) {
+               rt->stream_state = STREAM_STOPPING;
+
+               for (i = 0; i < PCM_N_URBS; i++) {
+                       time = usb_wait_anchor_empty_timeout(
+                                       &rt->out_urbs[i].submitted, 100);
+                       if (!time)
+                               usb_kill_anchored_urbs(
+                                       &rt->out_urbs[i].submitted);
+                       usb_kill_urb(&rt->out_urbs[i].instance);
+               }
+
+               rt->stream_state = STREAM_DISABLED;
+       }
+}
+
+/* call with stream_mutex locked */
+static int hiface_pcm_stream_start(struct pcm_runtime *rt)
+{
+       int ret = 0;
+       int i;
+
+       if (rt->stream_state == STREAM_DISABLED) {
+
+               /* reset panic state when starting a new stream */
+               rt->panic = false;
+
+               /* submit our out urbs zero init */
+               rt->stream_state = STREAM_STARTING;
+               for (i = 0; i < PCM_N_URBS; i++) {
+                       memset(rt->out_urbs[i].buffer, 0, PCM_PACKET_SIZE);
+                       usb_anchor_urb(&rt->out_urbs[i].instance,
+                                      &rt->out_urbs[i].submitted);
+                       ret = usb_submit_urb(&rt->out_urbs[i].instance,
+                                            GFP_ATOMIC);
+                       if (ret) {
+                               hiface_pcm_stream_stop(rt);
+                               return ret;
+                       }
+               }
+
+               /* wait for first out urb to return (sent in in urb handler) */
+               wait_event_timeout(rt->stream_wait_queue, rt->stream_wait_cond,
+                                  HZ);
+               if (rt->stream_wait_cond) {
+                       struct device *device = &rt->chip->dev->dev;
+                       dev_dbg(device, "%s: Stream is running wakeup event\n",
+                                __func__);
+                       rt->stream_state = STREAM_RUNNING;
+               } else {
+                       hiface_pcm_stream_stop(rt);
+                       return -EIO;
+               }
+       }
+       return ret;
+}
+
+/* The hardware wants word-swapped 32-bit values */
+static void memcpy_swahw32(u8 *dest, u8 *src, unsigned int n)
+{
+       unsigned int i;
+
+       for (i = 0; i < n / 4; i++)
+               ((u32 *)dest)[i] = swahw32(((u32 *)src)[i]);
+}
+
+/* call with substream locked */
+/* returns true if a period elapsed */
+static bool hiface_pcm_playback(struct pcm_substream *sub, struct pcm_urb *urb)
+{
+       struct snd_pcm_runtime *alsa_rt = sub->instance->runtime;
+       struct device *device = &urb->chip->dev->dev;
+       u8 *source;
+       unsigned int pcm_buffer_size;
+
+       WARN_ON(alsa_rt->format != SNDRV_PCM_FORMAT_S32_LE);
+
+       pcm_buffer_size = snd_pcm_lib_buffer_bytes(sub->instance);
+
+       if (sub->dma_off + PCM_PACKET_SIZE <= pcm_buffer_size) {
+               dev_dbg(device, "%s: (1) buffer_size %#x dma_offset %#x\n", __func__,
+                        (unsigned int) pcm_buffer_size,
+                        (unsigned int) sub->dma_off);
+
+               source = alsa_rt->dma_area + sub->dma_off;
+               memcpy_swahw32(urb->buffer, source, PCM_PACKET_SIZE);
+       } else {
+               /* wrap around at end of ring buffer */
+               unsigned int len;
+
+               dev_dbg(device, "%s: (2) buffer_size %#x dma_offset %#x\n", __func__,
+                        (unsigned int) pcm_buffer_size,
+                        (unsigned int) sub->dma_off);
+
+               len = pcm_buffer_size - sub->dma_off;
+
+               source = alsa_rt->dma_area + sub->dma_off;
+               memcpy_swahw32(urb->buffer, source, len);
+
+               source = alsa_rt->dma_area;
+               memcpy_swahw32(urb->buffer + len, source,
+                              PCM_PACKET_SIZE - len);
+       }
+       sub->dma_off += PCM_PACKET_SIZE;
+       if (sub->dma_off >= pcm_buffer_size)
+               sub->dma_off -= pcm_buffer_size;
+
+       sub->period_off += PCM_PACKET_SIZE;
+       if (sub->period_off >= alsa_rt->period_size) {
+               sub->period_off %= alsa_rt->period_size;
+               return true;
+       }
+       return false;
+}
+
+static void hiface_pcm_out_urb_handler(struct urb *usb_urb)
+{
+       struct pcm_urb *out_urb = usb_urb->context;
+       struct pcm_runtime *rt = out_urb->chip->pcm;
+       struct pcm_substream *sub;
+       bool do_period_elapsed = false;
+       unsigned long flags;
+       int ret;
+
+       if (rt->panic || rt->stream_state == STREAM_STOPPING)
+               return;
+
+       if (unlikely(usb_urb->status == -ENOENT ||      /* unlinked */
+                    usb_urb->status == -ENODEV ||      /* device removed */
+                    usb_urb->status == -ECONNRESET ||  /* unlinked */
+                    usb_urb->status == -ESHUTDOWN)) {  /* device disabled */
+               goto out_fail;
+       }
+
+       if (rt->stream_state == STREAM_STARTING) {
+               rt->stream_wait_cond = true;
+               wake_up(&rt->stream_wait_queue);
+       }
+
+       /* now send our playback data (if a free out urb was found) */
+       sub = &rt->playback;
+       spin_lock_irqsave(&sub->lock, flags);
+       if (sub->active)
+               do_period_elapsed = hiface_pcm_playback(sub, out_urb);
+       else
+               memset(out_urb->buffer, 0, PCM_PACKET_SIZE);
+
+       spin_unlock_irqrestore(&sub->lock, flags);
+
+       if (do_period_elapsed)
+               snd_pcm_period_elapsed(sub->instance);
+
+       ret = usb_submit_urb(&out_urb->instance, GFP_ATOMIC);
+       if (ret < 0)
+               goto out_fail;
+
+       return;
+
+out_fail:
+       rt->panic = true;
+}
+
+static int hiface_pcm_open(struct snd_pcm_substream *alsa_sub)
+{
+       struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
+       struct pcm_substream *sub = NULL;
+       struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
+       int ret;
+
+       if (rt->panic)
+               return -EPIPE;
+
+       mutex_lock(&rt->stream_mutex);
+       alsa_rt->hw = pcm_hw;
+
+       if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               sub = &rt->playback;
+
+       if (!sub) {
+               struct device *device = &rt->chip->dev->dev;
+               mutex_unlock(&rt->stream_mutex);
+               dev_err(device, "Invalid stream type\n");
+               return -EINVAL;
+       }
+
+       if (rt->extra_freq) {
+               alsa_rt->hw.rates |= SNDRV_PCM_RATE_KNOT;
+               alsa_rt->hw.rate_max = 384000;
+
+               /* explicit constraints needed as we added SNDRV_PCM_RATE_KNOT */
+               ret = snd_pcm_hw_constraint_list(alsa_sub->runtime, 0,
+                                                SNDRV_PCM_HW_PARAM_RATE,
+                                                &constraints_extra_rates);
+               if (ret < 0) {
+                       mutex_unlock(&rt->stream_mutex);
+                       return ret;
+               }
+       }
+
+       sub->instance = alsa_sub;
+       sub->active = false;
+       mutex_unlock(&rt->stream_mutex);
+       return 0;
+}
+
+static int hiface_pcm_close(struct snd_pcm_substream *alsa_sub)
+{
+       struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
+       struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub);
+       unsigned long flags;
+
+       if (rt->panic)
+               return 0;
+
+       mutex_lock(&rt->stream_mutex);
+       if (sub) {
+               hiface_pcm_stream_stop(rt);
+
+               /* deactivate substream */
+               spin_lock_irqsave(&sub->lock, flags);
+               sub->instance = NULL;
+               sub->active = false;
+               spin_unlock_irqrestore(&sub->lock, flags);
+
+       }
+       mutex_unlock(&rt->stream_mutex);
+       return 0;
+}
+
+static int hiface_pcm_hw_params(struct snd_pcm_substream *alsa_sub,
+                               struct snd_pcm_hw_params *hw_params)
+{
+       return snd_pcm_lib_alloc_vmalloc_buffer(alsa_sub,
+                                               params_buffer_bytes(hw_params));
+}
+
+static int hiface_pcm_hw_free(struct snd_pcm_substream *alsa_sub)
+{
+       return snd_pcm_lib_free_vmalloc_buffer(alsa_sub);
+}
+
+static int hiface_pcm_prepare(struct snd_pcm_substream *alsa_sub)
+{
+       struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
+       struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub);
+       struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
+       int ret;
+
+       if (rt->panic)
+               return -EPIPE;
+       if (!sub)
+               return -ENODEV;
+
+       mutex_lock(&rt->stream_mutex);
+
+       sub->dma_off = 0;
+       sub->period_off = 0;
+
+       if (rt->stream_state == STREAM_DISABLED) {
+
+               ret = hiface_pcm_set_rate(rt, alsa_rt->rate);
+               if (ret) {
+                       mutex_unlock(&rt->stream_mutex);
+                       return ret;
+               }
+               ret = hiface_pcm_stream_start(rt);
+               if (ret) {
+                       mutex_unlock(&rt->stream_mutex);
+                       return ret;
+               }
+       }
+       mutex_unlock(&rt->stream_mutex);
+       return 0;
+}
+
+static int hiface_pcm_trigger(struct snd_pcm_substream *alsa_sub, int cmd)
+{
+       struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub);
+       struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
+
+       if (rt->panic)
+               return -EPIPE;
+       if (!sub)
+               return -ENODEV;
+
+       switch (cmd) {
+       case SNDRV_PCM_TRIGGER_START:
+       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+               spin_lock_irq(&sub->lock);
+               sub->active = true;
+               spin_unlock_irq(&sub->lock);
+               return 0;
+
+       case SNDRV_PCM_TRIGGER_STOP:
+       case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+               spin_lock_irq(&sub->lock);
+               sub->active = false;
+               spin_unlock_irq(&sub->lock);
+               return 0;
+
+       default:
+               return -EINVAL;
+       }
+}
+
+static snd_pcm_uframes_t hiface_pcm_pointer(struct snd_pcm_substream *alsa_sub)
+{
+       struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub);
+       struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
+       unsigned long flags;
+       snd_pcm_uframes_t dma_offset;
+
+       if (rt->panic || !sub)
+               return SNDRV_PCM_STATE_XRUN;
+
+       spin_lock_irqsave(&sub->lock, flags);
+       dma_offset = sub->dma_off;
+       spin_unlock_irqrestore(&sub->lock, flags);
+       return bytes_to_frames(alsa_sub->runtime, dma_offset);
+}
+
+static struct snd_pcm_ops pcm_ops = {
+       .open = hiface_pcm_open,
+       .close = hiface_pcm_close,
+       .ioctl = snd_pcm_lib_ioctl,
+       .hw_params = hiface_pcm_hw_params,
+       .hw_free = hiface_pcm_hw_free,
+       .prepare = hiface_pcm_prepare,
+       .trigger = hiface_pcm_trigger,
+       .pointer = hiface_pcm_pointer,
+       .page = snd_pcm_lib_get_vmalloc_page,
+       .mmap = snd_pcm_lib_mmap_vmalloc,
+};
+
+static int hiface_pcm_init_urb(struct pcm_urb *urb,
+                              struct hiface_chip *chip,
+                              unsigned int ep,
+                              void (*handler)(struct urb *))
+{
+       urb->chip = chip;
+       usb_init_urb(&urb->instance);
+
+       urb->buffer = kzalloc(PCM_PACKET_SIZE, GFP_KERNEL);
+       if (!urb->buffer)
+               return -ENOMEM;
+
+       usb_fill_bulk_urb(&urb->instance, chip->dev,
+                         usb_sndbulkpipe(chip->dev, ep), (void *)urb->buffer,
+                         PCM_PACKET_SIZE, handler, urb);
+       init_usb_anchor(&urb->submitted);
+
+       return 0;
+}
+
+void hiface_pcm_abort(struct hiface_chip *chip)
+{
+       struct pcm_runtime *rt = chip->pcm;
+
+       if (rt) {
+               rt->panic = true;
+
+               mutex_lock(&rt->stream_mutex);
+               hiface_pcm_stream_stop(rt);
+               mutex_unlock(&rt->stream_mutex);
+       }
+}
+
+static void hiface_pcm_destroy(struct hiface_chip *chip)
+{
+       struct pcm_runtime *rt = chip->pcm;
+       int i;
+
+       for (i = 0; i < PCM_N_URBS; i++)
+               kfree(rt->out_urbs[i].buffer);
+
+       kfree(chip->pcm);
+       chip->pcm = NULL;
+}
+
+static void hiface_pcm_free(struct snd_pcm *pcm)
+{
+       struct pcm_runtime *rt = pcm->private_data;
+
+       if (rt)
+               hiface_pcm_destroy(rt->chip);
+}
+
+int hiface_pcm_init(struct hiface_chip *chip, u8 extra_freq)
+{
+       int i;
+       int ret;
+       struct snd_pcm *pcm;
+       struct pcm_runtime *rt;
+
+       rt = kzalloc(sizeof(*rt), GFP_KERNEL);
+       if (!rt)
+               return -ENOMEM;
+
+       rt->chip = chip;
+       rt->stream_state = STREAM_DISABLED;
+       if (extra_freq)
+               rt->extra_freq = 1;
+
+       init_waitqueue_head(&rt->stream_wait_queue);
+       mutex_init(&rt->stream_mutex);
+       spin_lock_init(&rt->playback.lock);
+
+       for (i = 0; i < PCM_N_URBS; i++)
+               hiface_pcm_init_urb(&rt->out_urbs[i], chip, OUT_EP,
+                                   hiface_pcm_out_urb_handler);
+
+       ret = snd_pcm_new(chip->card, "USB-SPDIF Audio", 0, 1, 0, &pcm);
+       if (ret < 0) {
+               kfree(rt);
+               dev_err(&chip->dev->dev, "Cannot create pcm instance\n");
+               return ret;
+       }
+
+       pcm->private_data = rt;
+       pcm->private_free = hiface_pcm_free;
+
+       strlcpy(pcm->name, "USB-SPDIF Audio", sizeof(pcm->name));
+       snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops);
+
+       rt->instance = pcm;
+
+       chip->pcm = rt;
+       return 0;
+}
diff --git a/sound/usb/hiface/pcm.h b/sound/usb/hiface/pcm.h
new file mode 100644 (file)
index 0000000..77edd7c
--- /dev/null
@@ -0,0 +1,24 @@
+/*
+ * Linux driver for M2Tech hiFace compatible devices
+ *
+ * Copyright 2012-2013 (C) M2TECH S.r.l and Amarula Solutions B.V.
+ *
+ * Authors:  Michael Trimarchi <michael@amarulasolutions.com>
+ *           Antonio Ospite <ao2@amarulasolutions.com>
+ *
+ * The driver is based on the work done in TerraTec DMX 6Fire USB
+ *
+ * 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.
+ */
+
+#ifndef HIFACE_PCM_H
+#define HIFACE_PCM_H
+
+struct hiface_chip;
+
+int hiface_pcm_init(struct hiface_chip *chip, u8 extra_freq);
+void hiface_pcm_abort(struct hiface_chip *chip);
+#endif /* HIFACE_PCM_H */