sound/pci/echoaudio/indigoio_dsp.c

Source file repositories/reference/linux-study-clean/sound/pci/echoaudio/indigoio_dsp.c

File Facts

System
Linux kernel
Corpus path
sound/pci/echoaudio/indigoio_dsp.c
Extension
.c
Size
2800 bytes
Lines
123
Domain
Driver Families
Bucket
sound/pci
Inferred role
Driver Families: implementation source
Status
source 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

// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************

   Copyright Echo Digital Audio Corporation (c) 1998 - 2004
   All rights reserved
   www.echoaudio.com

   This file is part of Echo Digital Audio's generic driver library.
   *************************************************************************

 Translation from C++ and adaptation for use in ALSA-Driver
 were made by Giuliano Pochini <pochini@shiny.it>

****************************************************************************/


static int set_vmixer_gain(struct echoaudio *chip, u16 output, u16 pipe,
			   int gain);
static int update_vmixer_level(struct echoaudio *chip);


static int init_hw(struct echoaudio *chip, u16 device_id, u16 subdevice_id)
{
	int err;

	if (snd_BUG_ON((subdevice_id & 0xfff0) != INDIGO_IO))
		return -ENODEV;

	err = init_dsp_comm_page(chip);
	if (err) {
		dev_err(chip->card->dev,
			"init_hw - could not initialize DSP comm page\n");
		return err;
	}

	chip->device_id = device_id;
	chip->subdevice_id = subdevice_id;
	chip->bad_board = true;
	chip->dsp_code_to_load = FW_INDIGO_IO_DSP;
	/* Since this card has no ASIC, mark it as loaded so everything
	   works OK */
	chip->asic_loaded = true;
	chip->input_clock_types = ECHO_CLOCK_BIT_INTERNAL;

	err = load_firmware(chip);
	if (err < 0)
		return err;
	chip->bad_board = false;

	return err;
}



static int set_mixer_defaults(struct echoaudio *chip)
{
	return init_line_levels(chip);
}



static u32 detect_input_clocks(const struct echoaudio *chip)
{
	return ECHO_CLOCK_BIT_INTERNAL;
}



/* The IndigoIO has no ASIC. Just do nothing */
static int load_asic(struct echoaudio *chip)
{
	return 0;
}



static int set_sample_rate(struct echoaudio *chip, u32 rate)
{
	if (wait_handshake(chip))
		return -EIO;

	chip->sample_rate = rate;
	chip->comm_page->sample_rate = cpu_to_le32(rate);
	clear_handshake(chip);
	return send_vector(chip, DSP_VC_UPDATE_CLOCKS);
}



/* This function routes the sound from a virtual channel to a real output */

Annotation

Implementation Notes