init
This commit is contained in:
commit
1e12ac15b8
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@ -0,0 +1,8 @@
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*.cmd
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*.mod
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*.o
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*.ko
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*.order
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*.mod.c
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*.symvers
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.clang-format
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@ -0,0 +1,11 @@
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obj-m += aes67.o
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CC=ccache gcc
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KERN_DIR=/lib/modules/$(shell uname -r)/build/
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host:
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$(MAKE) -C $(KERN_DIR) M=$$PWD modules
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clean:
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make -C $(KERN_DIR) M=$(PWD) clean
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help:
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make -C $(KERN_DIR) M=$(PWD) help
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@ -0,0 +1,371 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AES67 soundcard
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*
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* */
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <sound/pcm.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
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static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
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static int pcm_devs[SNDRV_CARDS] = { [0 ...(SNDRV_CARDS - 1)] = 1 };
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static int pcm_substreams[SNDRV_CARDS] = { [0 ...(SNDRV_CARDS - 1)] = 8 };
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static struct platform_device *devices[SNDRV_CARDS];
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#define CARD_NAME "AES67 Virtual Soundcard"
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
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module_param_array(pcm_devs, int, NULL, 0444);
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MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
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module_param_array(pcm_substreams, int, NULL, 0444);
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MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
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MODULE_AUTHOR("Preston Baxter <preston@preston-baxter.xom>");
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MODULE_DESCRIPTION("AES67 Virtual Soundcard");
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MODULE_LICENSE("GPL");
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/* Definistion of AES67 Virtual SoundCard */
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struct aes67 {
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struct snd_card *card;
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struct snd_pcm *pcm;
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struct device *dev;
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};
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/* Destructor */
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static int snd_aes67_free(struct aes67 *virtcard)
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{
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snd_card_free(virtcard->card);
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kfree(virtcard);
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return 0;
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}
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/* Component Free */
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static int snd_aes67_dev_free(struct snd_device *device)
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{
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return snd_aes67_free(device->device_data);
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}
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/* Constructor */
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static int snd_aes67_create(struct snd_card *card, struct aes67 **rvirtcard)
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{
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struct aes67 *virtcard;
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int err;
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static const struct snd_device_ops ops = {
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.dev_free = snd_aes67_dev_free,
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};
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*rvirtcard = NULL;
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/* Setup Connection Handlers */
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/* allocate memory for virt card */
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virtcard = kzalloc(sizeof(*virtcard), GFP_KERNEL);
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if (virtcard == NULL)
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return -ENOMEM;
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virtcard->card = card;
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/* COnnect to things */
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/* Build Sound Device */
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err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, virtcard, &ops);
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if (err < 0) {
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snd_aes67_free(virtcard);
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return err;
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}
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*rvirtcard = virtcard;
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return 0;
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}
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/* Probe method */
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static int aes67_probe(struct platform_device *devptr)
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{
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struct snd_card *card;
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struct aes67 *virtcard;
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int dev = devptr->id;
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int err;
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snd_printk(KERN_INFO "Attempting to create Soundcard for AES67\n");
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err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
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sizeof(struct aes67), &card);
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if (err < 0) {
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snd_printk(KERN_ERR "Unable to create AES67 Soundcard\n");
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return err;
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}
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virtcard = card->private_data;
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snd_printk(KERN_INFO "Attempting to create AES67 Virtual Soundcard\n");
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err = snd_aes67_create(card, &virtcard);
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if (err < 0) {
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snd_printk(KERN_ERR "Unable to create AES67rtual Soundcard\n");
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goto error;
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}
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/* Setup Names */
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strcpy(card->driver, "AES67 VSC");
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strcpy(card->shortname, "AES67 Virtual Soundcard");
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strcpy(card->longname, "AES67 Virtual Soundcard - 8x8");
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snd_printk(KERN_INFO
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"Attempting to Register AES67 Virtual Soundcard\n");
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err = snd_card_register(card);
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if (err < 0) {
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snd_printk(KERN_ERR
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"Unable to Register AES67 Virtual Soundcard\n");
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goto error;
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}
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platform_set_drvdata(devptr, card);
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return 0;
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error:
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snd_card_free(card);
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return err;
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}
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/* PCM Shenaniagians */
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/* Playback definition */
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static struct snd_pcm_hardware snd_aes67_playback_hw = {
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rates = SNDRV_PCM_RATE_8000_48000,
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.rate_min = 8000,
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.rate_max = 48000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 32768,
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.period_bytes_min = 4096,
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.period_bytes_max = 32768,
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.periods_min = 1,
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.periods_max = 1024,
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};
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/* Capture definition */
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static struct snd_pcm_hardware snd_aes67_capture_hw = {
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rates = SNDRV_PCM_RATE_8000_48000,
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.rate_min = 8000,
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.rate_max = 48000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 32768,
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.period_bytes_min = 4096,
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.period_bytes_max = 32768,
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.periods_min = 1,
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.periods_max = 1024,
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};
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static int snd_aes67_playback_open(struct snd_pcm_substream *substream)
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{
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struct aes67 *virtcard = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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runtime->hw = snd_aes67_playback_hw;
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return 0;
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}
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static int snd_aes67_playback_close(struct snd_pcm_substream *substream)
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{
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struct aes67 *virtcard = snd_pcm_substream_chip(substream);
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return 0;
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}
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static int snd_aes67_capture_open(struct snd_pcm_substream *substream)
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{
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struct aes67 *virtcard = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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runtime->hw = snd_aes67_capture_hw;
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return 0;
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}
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static int snd_aes67_capture_close(struct snd_pcm_substream *substream)
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{
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struct aes67 *virtcard = snd_pcm_substream_chip(substream);
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return 0;
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}
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static int snd_aes67_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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/* the hardware-specific codes will be here */
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return 0;
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}
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/* hw_free callback */
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static int snd_aes67_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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/* the hardware-specific codes will be here */
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return 0;
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}
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static int snd_aes67_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct aes67 *chip = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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/* set up the hardware with the current configuration
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* for example...
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*/
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return 0;
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}
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static int snd_aes67_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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/* do something to start the PCM engine */
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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/* do something to stop the PCM engine */
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break;
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static snd_pcm_uframes_t aes67_get_hw_pointer(struct aes67 *virtcard)
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{
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return 0;
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}
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static snd_pcm_uframes_t
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snd_aes67_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct aes67 *chip = snd_pcm_substream_chip(substream);
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unsigned int current_frame;
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/* get the current hardware pointer */
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current_frame = aes67_get_hw_pointer(chip);
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return current_frame;
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}
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/* operators */
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static struct snd_pcm_ops snd_aes67_playback_ops = {
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.open = snd_aes67_playback_open,
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.close = snd_aes67_playback_close,
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.hw_params = snd_aes67_pcm_hw_params,
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.hw_free = snd_aes67_pcm_hw_free,
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.prepare = snd_aes67_pcm_prepare,
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.trigger = snd_aes67_pcm_trigger,
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.pointer = snd_aes67_pcm_pointer,
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};
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/* operators */
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static struct snd_pcm_ops snd_aes67_capture_ops = {
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.open = snd_aes67_capture_open,
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.close = snd_aes67_capture_close,
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.hw_params = snd_aes67_pcm_hw_params,
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.hw_free = snd_aes67_pcm_hw_free,
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.prepare = snd_aes67_pcm_prepare,
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.trigger = snd_aes67_pcm_trigger,
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.pointer = snd_aes67_pcm_pointer,
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};
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static int snd_aes67_new_pcm(struct aes67 *virtcard)
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{
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struct snd_pcm *pcm;
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int err;
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err = snd_pcm_new(virtcard->card, CARD_NAME, 0, 1, 1, &pcm);
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if (err < 0)
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return err;
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pcm->private_data = virtcard;
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strcpy(pcm->name, CARD_NAME);
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virtcard->pcm = pcm;
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/* set operators */
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
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&snd_aes67_playback_ops);
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_aes67_capture_ops);
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/*Da buffers*/
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snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, NULL, 64 * 1024,
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64 * 1024);
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return 0;
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}
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/* Power Methods */
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static int snd_aes67_suspend(struct device *pdev)
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{
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struct snd_card *card = dev_get_drvdata(pdev);
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snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
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return 0;
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}
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static int snd_aes67_resume(struct device *pdev)
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{
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struct snd_card *card = dev_get_drvdata(pdev);
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snd_power_change_state(card, SNDRV_CTL_POWER_D0);
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return 0;
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}
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/* Power management operations. Most definitely need to revisit this */
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static DEFINE_SIMPLE_DEV_PM_OPS(snd_aes67_pm, snd_aes67_suspend,
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snd_aes67_resume);
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#define SND_AES67_DRIVER "snd_aes67"
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static struct platform_driver snd_aes67_driver = {
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.probe = aes67_probe,
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.driver = {
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.name = SND_AES67_DRIVER,
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.pm = &snd_aes67_pm,
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},
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};
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/* Module init and exit functions */
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static int __init alsa_card_aes67_init(void)
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{
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int err;
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//Add driver to registry
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snd_printk(KERN_INFO "Attempting to register driver for AES67\n");
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err = platform_driver_register(&snd_aes67_driver);
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if (err < 0) {
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snd_printk(KERN_ERR "FAILED to register driver for AES67\n");
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return err;
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}
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//register a card in the kernel
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struct platform_device *device;
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device = platform_device_register_simple(SND_AES67_DRIVER, 0, NULL, 0);
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if (IS_ERR(device)) {
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snd_printk(KERN_ERR "Failed to register AES67 Device\n");
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return -ENODEV;
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}
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if (!platform_get_drvdata(device)) {
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snd_printk(KERN_ERR "No device data for AES67\n");
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platform_device_unregister(device);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit alsa_card_aes67_exit(void)
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{
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snd_printk(KERN_INFO "Attempting to unregistered driver for AES67\n");
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platform_driver_unregister(&snd_aes67_driver);
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}
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module_init(alsa_card_aes67_init)
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module_exit(alsa_card_aes67_exit)
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