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d7da429339
Variable result is initialized to a value that is never read and it is
re-assigned later. The initialization is redundant and can be removed.
Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
294 lines
6.3 KiB
C
294 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Uros Bizjak <uros@kss-loka.si>
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*
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* Lowlevel routines for control of Sound Blaster cards
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <sound/core.h>
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#include <sound/sb.h>
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#include <sound/initval.h>
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#include <asm/dma.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("ALSA lowlevel driver for Sound Blaster cards");
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MODULE_LICENSE("GPL");
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#define BUSY_LOOPS 100000
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#undef IO_DEBUG
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int snd_sbdsp_command(struct snd_sb *chip, unsigned char val)
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{
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int i;
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#ifdef IO_DEBUG
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snd_printk(KERN_DEBUG "command 0x%x\n", val);
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#endif
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for (i = BUSY_LOOPS; i; i--)
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if ((inb(SBP(chip, STATUS)) & 0x80) == 0) {
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outb(val, SBP(chip, COMMAND));
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return 1;
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}
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snd_printd("%s [0x%lx]: timeout (0x%x)\n", __func__, chip->port, val);
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return 0;
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}
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int snd_sbdsp_get_byte(struct snd_sb *chip)
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{
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int val;
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int i;
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for (i = BUSY_LOOPS; i; i--) {
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if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
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val = inb(SBP(chip, READ));
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#ifdef IO_DEBUG
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snd_printk(KERN_DEBUG "get_byte 0x%x\n", val);
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#endif
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return val;
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}
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}
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snd_printd("%s [0x%lx]: timeout\n", __func__, chip->port);
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return -ENODEV;
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}
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int snd_sbdsp_reset(struct snd_sb *chip)
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{
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int i;
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outb(1, SBP(chip, RESET));
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udelay(10);
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outb(0, SBP(chip, RESET));
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udelay(30);
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for (i = BUSY_LOOPS; i; i--)
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if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
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if (inb(SBP(chip, READ)) == 0xaa)
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return 0;
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else
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break;
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}
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snd_printdd("%s [0x%lx] failed...\n", __func__, chip->port);
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return -ENODEV;
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}
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static int snd_sbdsp_version(struct snd_sb * chip)
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{
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unsigned int result;
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snd_sbdsp_command(chip, SB_DSP_GET_VERSION);
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result = (short) snd_sbdsp_get_byte(chip) << 8;
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result |= (short) snd_sbdsp_get_byte(chip);
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return result;
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}
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static int snd_sbdsp_probe(struct snd_sb * chip)
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{
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int version;
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int major, minor;
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char *str;
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unsigned long flags;
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/*
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* initialization sequence
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*/
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spin_lock_irqsave(&chip->reg_lock, flags);
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if (snd_sbdsp_reset(chip) < 0) {
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spin_unlock_irqrestore(&chip->reg_lock, flags);
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return -ENODEV;
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}
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version = snd_sbdsp_version(chip);
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if (version < 0) {
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spin_unlock_irqrestore(&chip->reg_lock, flags);
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return -ENODEV;
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}
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spin_unlock_irqrestore(&chip->reg_lock, flags);
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major = version >> 8;
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minor = version & 0xff;
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snd_printdd("SB [0x%lx]: DSP chip found, version = %i.%i\n",
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chip->port, major, minor);
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switch (chip->hardware) {
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case SB_HW_AUTO:
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switch (major) {
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case 1:
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chip->hardware = SB_HW_10;
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str = "1.0";
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break;
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case 2:
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if (minor) {
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chip->hardware = SB_HW_201;
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str = "2.01+";
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} else {
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chip->hardware = SB_HW_20;
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str = "2.0";
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}
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break;
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case 3:
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chip->hardware = SB_HW_PRO;
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str = "Pro";
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break;
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case 4:
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chip->hardware = SB_HW_16;
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str = "16";
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break;
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default:
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snd_printk(KERN_INFO "SB [0x%lx]: unknown DSP chip version %i.%i\n",
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chip->port, major, minor);
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return -ENODEV;
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}
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break;
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case SB_HW_ALS100:
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str = "16 (ALS-100)";
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break;
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case SB_HW_ALS4000:
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str = "16 (ALS-4000)";
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break;
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case SB_HW_DT019X:
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str = "(DT019X/ALS007)";
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break;
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case SB_HW_CS5530:
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str = "16 (CS5530)";
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break;
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case SB_HW_JAZZ16:
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str = "Pro (Jazz16)";
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break;
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default:
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return -ENODEV;
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}
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sprintf(chip->name, "Sound Blaster %s", str);
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chip->version = (major << 8) | minor;
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return 0;
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}
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static int snd_sbdsp_free(struct snd_sb *chip)
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{
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release_and_free_resource(chip->res_port);
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if (chip->irq >= 0)
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free_irq(chip->irq, (void *) chip);
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#ifdef CONFIG_ISA
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if (chip->dma8 >= 0) {
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disable_dma(chip->dma8);
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free_dma(chip->dma8);
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}
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if (chip->dma16 >= 0 && chip->dma16 != chip->dma8) {
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disable_dma(chip->dma16);
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free_dma(chip->dma16);
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}
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#endif
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kfree(chip);
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return 0;
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}
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static int snd_sbdsp_dev_free(struct snd_device *device)
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{
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struct snd_sb *chip = device->device_data;
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return snd_sbdsp_free(chip);
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}
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int snd_sbdsp_create(struct snd_card *card,
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unsigned long port,
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int irq,
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irq_handler_t irq_handler,
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int dma8,
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int dma16,
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unsigned short hardware,
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struct snd_sb **r_chip)
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{
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struct snd_sb *chip;
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int err;
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static struct snd_device_ops ops = {
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.dev_free = snd_sbdsp_dev_free,
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};
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if (snd_BUG_ON(!r_chip))
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return -EINVAL;
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*r_chip = NULL;
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chip = kzalloc(sizeof(*chip), GFP_KERNEL);
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if (chip == NULL)
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return -ENOMEM;
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spin_lock_init(&chip->reg_lock);
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spin_lock_init(&chip->open_lock);
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spin_lock_init(&chip->midi_input_lock);
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spin_lock_init(&chip->mixer_lock);
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chip->irq = -1;
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chip->dma8 = -1;
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chip->dma16 = -1;
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chip->port = port;
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if (request_irq(irq, irq_handler,
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(hardware == SB_HW_ALS4000 ||
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hardware == SB_HW_CS5530) ?
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IRQF_SHARED : 0,
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"SoundBlaster", (void *) chip)) {
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snd_printk(KERN_ERR "sb: can't grab irq %d\n", irq);
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snd_sbdsp_free(chip);
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return -EBUSY;
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}
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chip->irq = irq;
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if (hardware == SB_HW_ALS4000)
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goto __skip_allocation;
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if ((chip->res_port = request_region(port, 16, "SoundBlaster")) == NULL) {
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snd_printk(KERN_ERR "sb: can't grab port 0x%lx\n", port);
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snd_sbdsp_free(chip);
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return -EBUSY;
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}
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#ifdef CONFIG_ISA
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if (dma8 >= 0 && request_dma(dma8, "SoundBlaster - 8bit")) {
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snd_printk(KERN_ERR "sb: can't grab DMA8 %d\n", dma8);
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snd_sbdsp_free(chip);
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return -EBUSY;
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}
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chip->dma8 = dma8;
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if (dma16 >= 0) {
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if (hardware != SB_HW_ALS100 && (dma16 < 5 || dma16 > 7)) {
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/* no duplex */
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dma16 = -1;
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} else if (request_dma(dma16, "SoundBlaster - 16bit")) {
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snd_printk(KERN_ERR "sb: can't grab DMA16 %d\n", dma16);
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snd_sbdsp_free(chip);
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return -EBUSY;
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}
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}
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chip->dma16 = dma16;
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#endif
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__skip_allocation:
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chip->card = card;
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chip->hardware = hardware;
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if ((err = snd_sbdsp_probe(chip)) < 0) {
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snd_sbdsp_free(chip);
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return err;
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}
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if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
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snd_sbdsp_free(chip);
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return err;
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}
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*r_chip = chip;
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return 0;
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}
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EXPORT_SYMBOL(snd_sbdsp_command);
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EXPORT_SYMBOL(snd_sbdsp_get_byte);
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EXPORT_SYMBOL(snd_sbdsp_reset);
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EXPORT_SYMBOL(snd_sbdsp_create);
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/* sb_mixer.c */
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EXPORT_SYMBOL(snd_sbmixer_write);
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EXPORT_SYMBOL(snd_sbmixer_read);
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EXPORT_SYMBOL(snd_sbmixer_new);
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EXPORT_SYMBOL(snd_sbmixer_add_ctl);
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#ifdef CONFIG_PM
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EXPORT_SYMBOL(snd_sbmixer_suspend);
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EXPORT_SYMBOL(snd_sbmixer_resume);
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#endif
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