--- /dev/null
+/*
+ * 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_352800 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 352800:
+ rate_value = HIFACE_RATE_352800;
+ 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_POS_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;
+}
Code Review / kvmfornfv.git / blobdiff