drivers/hsi/clients/cmt_speech.c

Source file repositories/reference/linux-study-clean/drivers/hsi/clients/cmt_speech.c

File Facts

System
Linux kernel
Corpus path
drivers/hsi/clients/cmt_speech.c
Extension
.c
Size
34187 bytes
Lines
1449
Domain
Driver Families
Bucket
drivers/hsi
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct file_operations cs_char_fops = {
	.owner		= THIS_MODULE,
	.read		= cs_char_read,
	.write		= cs_char_write,
	.poll		= cs_char_poll,
	.unlocked_ioctl	= cs_char_ioctl,
	.mmap		= cs_char_mmap,
	.open		= cs_char_open,
	.release	= cs_char_release,
	.fasync		= cs_char_fasync,
};

static struct miscdevice cs_char_miscdev = {
	.minor	= MISC_DYNAMIC_MINOR,
	.name	= "cmt_speech",
	.fops	= &cs_char_fops
};

static int cs_hsi_client_probe(struct device *dev)
{
	int err = 0;
	struct hsi_client *cl = to_hsi_client(dev);

	dev_dbg(dev, "hsi_client_probe\n");
	init_waitqueue_head(&cs_char_data.wait);
	spin_lock_init(&cs_char_data.lock);
	cs_char_data.opened = 0;
	cs_char_data.cl = cl;
	cs_char_data.hi = NULL;
	INIT_LIST_HEAD(&cs_char_data.chardev_queue);
	INIT_LIST_HEAD(&cs_char_data.dataind_queue);

	cs_char_data.channel_id_cmd = hsi_get_channel_id_by_name(cl,
		"speech-control");
	if (cs_char_data.channel_id_cmd < 0) {
		err = cs_char_data.channel_id_cmd;
		dev_err(dev, "Could not get cmd channel (%d)\n", err);
		return err;
	}

	cs_char_data.channel_id_data = hsi_get_channel_id_by_name(cl,
		"speech-data");
	if (cs_char_data.channel_id_data < 0) {
		err = cs_char_data.channel_id_data;
		dev_err(dev, "Could not get data channel (%d)\n", err);
		return err;
	}

	err = misc_register(&cs_char_miscdev);
	if (err)
		dev_err(dev, "Failed to register: %d\n", err);

	return err;
}

static int cs_hsi_client_remove(struct device *dev)
{
	struct cs_hsi_iface *hi;

	dev_dbg(dev, "hsi_client_remove\n");
	misc_deregister(&cs_char_miscdev);
	spin_lock_bh(&cs_char_data.lock);
	hi = cs_char_data.hi;
	cs_char_data.hi = NULL;
	spin_unlock_bh(&cs_char_data.lock);
	if (hi)
		cs_hsi_stop(hi);

	return 0;
}

static struct hsi_client_driver cs_hsi_driver = {
	.driver = {
		.name	= "cmt-speech",
		.owner	= THIS_MODULE,
		.probe	= cs_hsi_client_probe,
		.remove	= cs_hsi_client_remove,
	},
};

static int __init cs_char_init(void)
{
	pr_info("CMT speech driver added\n");
	return hsi_register_client_driver(&cs_hsi_driver);
}
module_init(cs_char_init);

static void __exit cs_char_exit(void)
{
	hsi_unregister_client_driver(&cs_hsi_driver);

Annotation

Implementation Notes