sound/isa/cs423x/cs4231.c

Source file repositories/reference/linux-study-clean/sound/isa/cs423x/cs4231.c

File Facts

System
Linux kernel
Corpus path
sound/isa/cs423x/cs4231.c
Extension
.c
Size
4925 bytes
Lines
169
Domain
Driver Families
Bucket
sound/isa
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-or-later
/*
 *  Generic driver for CS4231 chips
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Originally the CS4232/CS4232A driver, modified for use on CS4231 by
 *  Tugrul Galatali <galatalt@stuy.edu>
 */

#include <linux/init.h>
#include <linux/err.h>
#include <linux/isa.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/wss.h>
#include <sound/mpu401.h>
#include <sound/initval.h>

#define CRD_NAME "Generic CS4231"
#define DEV_NAME "cs4231"

MODULE_DESCRIPTION(CRD_NAME);
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_LICENSE("GPL");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;	/* Enable this card */
static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;	/* PnP setup */
static long mpu_port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;	/* PnP setup */
static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* 5,7,9,11,12,15 */
static int mpu_irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* 9,11,12,15 */
static int dma1[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;	/* 0,1,3,5,6,7 */
static int dma2[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;	/* 0,1,3,5,6,7 */

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " CRD_NAME " soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for " CRD_NAME " soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable " CRD_NAME " soundcard.");
module_param_hw_array(port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(port, "Port # for " CRD_NAME " driver.");
module_param_hw_array(mpu_port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(mpu_port, "MPU-401 port # for " CRD_NAME " driver.");
module_param_hw_array(irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(irq, "IRQ # for " CRD_NAME " driver.");
module_param_hw_array(mpu_irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(mpu_irq, "MPU-401 IRQ # for " CRD_NAME " driver.");
module_param_hw_array(dma1, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma1, "DMA1 # for " CRD_NAME " driver.");
module_param_hw_array(dma2, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma2, "DMA2 # for " CRD_NAME " driver.");

static int snd_cs4231_match(struct device *dev, unsigned int n)
{
	if (!enable[n])
		return 0;

	if (port[n] == SNDRV_AUTO_PORT) {
		dev_err(dev, "please specify port\n");
		return 0;
	}
	if (irq[n] == SNDRV_AUTO_IRQ) {
		dev_err(dev, "please specify irq\n");
		return 0;
	}
	if (dma1[n] == SNDRV_AUTO_DMA) {
		dev_err(dev, "please specify dma1\n");
		return 0;
	}
	return 1;
}

static int snd_cs4231_probe(struct device *dev, unsigned int n)
{
	struct snd_card *card;
	struct snd_wss *chip;
	int error;

	error = snd_devm_card_new(dev, index[n], id[n], THIS_MODULE, 0, &card);
	if (error < 0)
		return error;

	error = snd_wss_create(card, port[n], -1, irq[n], dma1[n], dma2[n],
			WSS_HW_DETECT, 0, &chip);
	if (error < 0)
		return error;

Annotation

Implementation Notes