cregit-Linux how code gets into the kernel

Release 4.7 sound/oss/kahlua.c

Directory: sound/oss
/*
 *      Initialisation code for Cyrix/NatSemi VSA1 softaudio
 *
 *      (C) Copyright 2003 Red Hat Inc <alan@lxorguk.ukuu.org.uk>
 *
 * XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems.
 * The older version (VSA1) provides fairly good soundblaster emulation
 * although there are a couple of bugs: large DMA buffers break record,
 * and the MPU event handling seems suspect. VSA2 allows the native driver
 * to control the AC97 audio engine directly and requires a different driver.
 *
 * Thanks to National Semiconductor for providing the needed information
 * on the XpressAudio(tm) internals.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * TO DO:
 *      Investigate whether we can portably support Cognac (5520) in the
 *      same manner.
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>

#include "sound_config.h"

#include "sb.h"

/*
 *      Read a soundblaster compatible mixer register.
 *      In this case we are actually reading an SMI trap
 *      not real hardware.
 */


static u8 mixer_read(unsigned long io, u8 reg) { outb(reg, io + 4); udelay(20); reg = inb(io + 5); udelay(20); return reg; }

Contributors

PersonTokensPropCommitsCommitProp
alan coxalan cox44100.00%1100.00%
Total44100.00%1100.00%


static int probe_one(struct pci_dev *pdev, const struct pci_device_id *ent) { struct address_info *hw_config; unsigned long base; void __iomem *mem; unsigned long io; u16 map; u8 irq, dma8, dma16; int oldquiet; extern int sb_be_quiet; base = pci_resource_start(pdev, 0); if(base == 0UL) return 1; mem = ioremap(base, 128); if (!mem) return 1; map = readw(mem + 0x18); /* Read the SMI enables */ iounmap(mem); /* Map bits 0:1 * 0x20 + 0x200 = sb base 2 sb enable 3 adlib enable 5 MPU enable 0x330 6 MPU enable 0x300 The other bits may be used internally so must be masked */ io = 0x220 + 0x20 * (map & 3); if(map & (1<<2)) printk(KERN_INFO "kahlua: XpressAudio at 0x%lx\n", io); else return 1; if(map & (1<<5)) printk(KERN_INFO "kahlua: MPU at 0x300\n"); else if(map & (1<<6)) printk(KERN_INFO "kahlua: MPU at 0x330\n"); irq = mixer_read(io, 0x80) & 0x0F; dma8 = mixer_read(io, 0x81); // printk("IRQ=%x MAP=%x DMA=%x\n", irq, map, dma8); if(dma8 & 0x20) dma16 = 5; else if(dma8 & 0x40) dma16 = 6; else if(dma8 & 0x80) dma16 = 7; else { printk(KERN_ERR "kahlua: No 16bit DMA enabled.\n"); return 1; } if(dma8 & 0x01) dma8 = 0; else if(dma8 & 0x02) dma8 = 1; else if(dma8 & 0x08) dma8 = 3; else { printk(KERN_ERR "kahlua: No 8bit DMA enabled.\n"); return 1; } if(irq & 1) irq = 9; else if(irq & 2) irq = 5; else if(irq & 4) irq = 7; else if(irq & 8) irq = 10; else { printk(KERN_ERR "kahlua: SB IRQ not set.\n"); return 1; } printk(KERN_INFO "kahlua: XpressAudio on IRQ %d, DMA %d, %d\n", irq, dma8, dma16); hw_config = kzalloc(sizeof(struct address_info), GFP_KERNEL); if(hw_config == NULL) { printk(KERN_ERR "kahlua: out of memory.\n"); return 1; } pci_set_drvdata(pdev, hw_config); hw_config->io_base = io; hw_config->irq = irq; hw_config->dma = dma8; hw_config->dma2 = dma16; hw_config->name = "Cyrix XpressAudio"; hw_config->driver_use_1 = SB_NO_MIDI | SB_PCI_IRQ; if (!request_region(io, 16, "soundblaster")) goto err_out_free; if(sb_dsp_detect(hw_config, 0, 0, NULL)==0) { printk(KERN_ERR "kahlua: audio not responding.\n"); release_region(io, 16); goto err_out_free; } oldquiet = sb_be_quiet; sb_be_quiet = 1; if(sb_dsp_init(hw_config, THIS_MODULE)) { sb_be_quiet = oldquiet; goto err_out_free; } sb_be_quiet = oldquiet; return 0; err_out_free: kfree(hw_config); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
alan coxalan cox47191.99%116.67%
al viroal viro234.49%233.33%
francois romieufrancois romieu163.12%116.67%
harvey harrisonharvey harrison10.20%116.67%
robert p. j. dayrobert p. j. day10.20%116.67%
Total512100.00%6100.00%


static void remove_one(struct pci_dev *pdev) { struct address_info *hw_config = pci_get_drvdata(pdev); sb_dsp_unload(hw_config, 0); kfree(hw_config); }

Contributors

PersonTokensPropCommitsCommitProp
alan coxalan cox33100.00%1100.00%
Total33100.00%1100.00%

MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("Kahlua VSA1 PCI Audio"); MODULE_LICENSE("GPL"); /* * 5530 only. The 5510/5520 decode is different. */ static const struct pci_device_id id_tbl[] = { { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO), 0 }, { } }; MODULE_DEVICE_TABLE(pci, id_tbl); static struct pci_driver kahlua_driver = { .name = "kahlua", .id_table = id_tbl, .probe = probe_one, .remove = remove_one, };
static int __init kahlua_init_module(void) { printk(KERN_INFO "Cyrix Kahlua VSA1 XpressAudio support (c) Copyright 2003 Red Hat Inc\n"); return pci_register_driver(&kahlua_driver); }

Contributors

PersonTokensPropCommitsCommitProp
alan coxalan cox2195.45%150.00%
greg kroah-hartmangreg kroah-hartman14.55%150.00%
Total22100.00%2100.00%


static void kahlua_cleanup_module(void) { pci_unregister_driver(&kahlua_driver); }

Contributors

PersonTokensPropCommitsCommitProp
alan coxalan cox1392.86%150.00%
al viroal viro17.14%150.00%
Total14100.00%2100.00%

module_init(kahlua_init_module); module_exit(kahlua_cleanup_module);

Overall Contributors

PersonTokensPropCommitsCommitProp
alan coxalan cox66290.68%214.29%
al viroal viro243.29%321.43%
francois romieufrancois romieu162.19%17.14%
maciej soltysiakmaciej soltysiak81.10%17.14%
benoit tainebenoit taine60.82%17.14%
joe perchesjoe perches50.68%17.14%
tejun heotejun heo30.41%17.14%
pawel sikorapawel sikora30.41%17.14%
greg kroah-hartmangreg kroah-hartman10.14%17.14%
harvey harrisonharvey harrison10.14%17.14%
robert p. j. dayrobert p. j. day10.14%17.14%
Total730100.00%14100.00%
Directory: sound/oss
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