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linux/sound/oss/sb_card.c
David Howells 232b0b0829 Annotate hardware config module parameters in sound/oss/ 
When the kernel is running in secure boot mode, we lock down the kernel to
prevent userspace from modifying the running kernel image.  Whilst this
includes prohibiting access to things like /dev/mem, it must also prevent
access by means of configuring driver modules in such a way as to cause a
device to access or modify the kernel image.

To this end, annotate module_param* statements that refer to hardware
configuration and indicate for future reference what type of parameter they
specify.  The parameter parser in the core sees this information and can
skip such parameters with an error message if the kernel is locked down.
The module initialisation then runs as normal, but just sees whatever the
default values for those parameters is.

Note that we do still need to do the module initialisation because some
drivers have viable defaults set in case parameters aren't specified and
some drivers support automatic configuration (e.g. PNP or PCI) in addition
to manually coded parameters.

This patch annotates drivers in sound/oss/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jaroslav Kysela <perex@perex.cz>
cc: Takashi Iwai <tiwai@suse.com>
cc: Andrew Veliath <andrewtv@usa.net>
cc: alsa-devel@alsa-project.org
2017-04-20 12:02:32 +01:00

355 lines
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/*
* sound/oss/sb_card.c
*
* Detection routine for the ISA Sound Blaster and compatible sound
* cards.
*
* This file is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this
* software for more info.
*
* This is a complete rewrite of the detection routines. This was
* prompted by the PnP API change during v2.5 and the ugly state the
* code was in.
*
* Copyright (C) by Paul Laufer 2002. Based on code originally by
* Hannu Savolainen which was modified by many others over the
* years. Authors specifically mentioned in the previous version were:
* Daniel Stone, Alessandro Zummo, Jeff Garzik, Arnaldo Carvalho de
* Melo, Daniel Church, and myself.
*
* 02-05-2003 Original Release, Paul Laufer <paul@laufernet.com>
* 02-07-2003 Bug made it into first release. Take two.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/init.h>
#include "sound_config.h"
#include "sb_mixer.h"
#include "sb.h"
#ifdef CONFIG_PNP
#include <linux/pnp.h>
#endif /* CONFIG_PNP */
#include "sb_card.h"
MODULE_DESCRIPTION("OSS Soundblaster ISA PnP and legacy sound driver");
MODULE_LICENSE("GPL");
extern void *smw_free;
static int __initdata mpu_io = 0;
static int __initdata io = -1;
static int __initdata irq = -1;
static int __initdata dma = -1;
static int __initdata dma16 = -1;
static int __initdata type = 0; /* Can set this to a specific card type */
static int __initdata esstype = 0; /* ESS chip type */
static int __initdata acer = 0; /* Do acer notebook init? */
static int __initdata sm_games = 0; /* Logitech soundman games? */
static struct sb_card_config *legacy = NULL;
#ifdef CONFIG_PNP
static int pnp_registered;
static int __initdata pnp = 1;
/*
static int __initdata uart401 = 0;
*/
#else
static int __initdata pnp = 0;
#endif
module_param_hw(io, int, ioport, 000);
MODULE_PARM_DESC(io, "Soundblaster i/o base address (0x220,0x240,0x260,0x280)");
module_param_hw(irq, int, irq, 000);
MODULE_PARM_DESC(irq, "IRQ (5,7,9,10)");
module_param_hw(dma, int, dma, 000);
MODULE_PARM_DESC(dma, "8-bit DMA channel (0,1,3)");
module_param_hw(dma16, int, dma, 000);
MODULE_PARM_DESC(dma16, "16-bit DMA channel (5,6,7)");
module_param_hw(mpu_io, int, ioport, 000);
MODULE_PARM_DESC(mpu_io, "MPU base address");
module_param(type, int, 000);
MODULE_PARM_DESC(type, "You can set this to specific card type (doesn't " \
"work with pnp)");
module_param(sm_games, int, 000);
MODULE_PARM_DESC(sm_games, "Enable support for Logitech soundman games " \
"(doesn't work with pnp)");
module_param(esstype, int, 000);
MODULE_PARM_DESC(esstype, "ESS chip type (doesn't work with pnp)");
module_param(acer, int, 000);
MODULE_PARM_DESC(acer, "Set this to detect cards in some ACER notebooks "\
"(doesn't work with pnp)");
#ifdef CONFIG_PNP
module_param(pnp, int, 000);
MODULE_PARM_DESC(pnp, "Went set to 0 will disable detection using PnP. "\
"Default is 1.\n");
/* Not done yet.... */
/*
module_param(uart401, int, 000);
MODULE_PARM_DESC(uart401, "When set to 1, will attempt to detect and enable"\
"the mpu on some clones");
*/
#endif /* CONFIG_PNP */
/* OSS subsystem card registration shared by PnP and legacy routines */
static int sb_register_oss(struct sb_card_config *scc, struct sb_module_options *sbmo)
{
if (!request_region(scc->conf.io_base, 16, "soundblaster")) {
printk(KERN_ERR "sb: ports busy.\n");
kfree(scc);
return -EBUSY;
}
if (!sb_dsp_detect(&scc->conf, 0, 0, sbmo)) {
release_region(scc->conf.io_base, 16);
printk(KERN_ERR "sb: Failed DSP Detect.\n");
kfree(scc);
return -ENODEV;
}
if(!sb_dsp_init(&scc->conf, THIS_MODULE)) {
printk(KERN_ERR "sb: Failed DSP init.\n");
kfree(scc);
return -ENODEV;
}
if(scc->mpucnf.io_base > 0) {
scc->mpu = 1;
printk(KERN_INFO "sb: Turning on MPU\n");
if(!probe_sbmpu(&scc->mpucnf, THIS_MODULE))
scc->mpu = 0;
}
return 1;
}
static void sb_unload(struct sb_card_config *scc)
{
sb_dsp_unload(&scc->conf, 0);
if(scc->mpu)
unload_sbmpu(&scc->mpucnf);
kfree(scc);
}
/* Register legacy card with OSS subsystem */
static int __init sb_init_legacy(void)
{
struct sb_module_options sbmo = {0};
if((legacy = kzalloc(sizeof(struct sb_card_config), GFP_KERNEL)) == NULL) {
printk(KERN_ERR "sb: Error: Could not allocate memory\n");
return -ENOMEM;
}
legacy->conf.io_base = io;
legacy->conf.irq = irq;
legacy->conf.dma = dma;
legacy->conf.dma2 = dma16;
legacy->conf.card_subtype = type;
legacy->mpucnf.io_base = mpu_io;
legacy->mpucnf.irq = -1;
legacy->mpucnf.dma = -1;
legacy->mpucnf.dma2 = -1;
sbmo.esstype = esstype;
sbmo.sm_games = sm_games;
sbmo.acer = acer;
return sb_register_oss(legacy, &sbmo);
}
#ifdef CONFIG_PNP
/* Populate the OSS subsystem structures with information from PnP */
static void sb_dev2cfg(struct pnp_dev *dev, struct sb_card_config *scc)
{
scc->conf.io_base = -1;
scc->conf.irq = -1;
scc->conf.dma = -1;
scc->conf.dma2 = -1;
scc->mpucnf.io_base = -1;
scc->mpucnf.irq = -1;
scc->mpucnf.dma = -1;
scc->mpucnf.dma2 = -1;
/* All clones layout their PnP tables differently and some use
different logical devices for the MPU */
if(!strncmp("CTL",scc->card_id,3)) {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,0);
scc->conf.dma2 = pnp_dma(dev,1);
scc->mpucnf.io_base = pnp_port_start(dev,1);
return;
}
if(!strncmp("tBA",scc->card_id,3)) {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,0);
scc->conf.dma2 = pnp_dma(dev,1);
return;
}
if(!strncmp("ESS",scc->card_id,3)) {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,0);
scc->conf.dma2 = pnp_dma(dev,1);
scc->mpucnf.io_base = pnp_port_start(dev,2);
return;
}
if(!strncmp("CMI",scc->card_id,3)) {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,0);
scc->conf.dma2 = pnp_dma(dev,1);
return;
}
if(!strncmp("RWB",scc->card_id,3)) {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,0);
return;
}
if(!strncmp("ALS",scc->card_id,3)) {
if(!strncmp("ALS0007",scc->card_id,7)) {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,0);
} else {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,1);
scc->conf.dma2 = pnp_dma(dev,0);
}
return;
}
if(!strncmp("RTL",scc->card_id,3)) {
scc->conf.io_base = pnp_port_start(dev,0);
scc->conf.irq = pnp_irq(dev,0);
scc->conf.dma = pnp_dma(dev,1);
scc->conf.dma2 = pnp_dma(dev,0);
}
}
static unsigned int sb_pnp_devices;
/* Probe callback function for the PnP API */
static int sb_pnp_probe(struct pnp_card_link *card, const struct pnp_card_device_id *card_id)
{
struct sb_card_config *scc;
struct sb_module_options sbmo = {0}; /* Default to 0 for PnP */
struct pnp_dev *dev = pnp_request_card_device(card, card_id->devs[0].id, NULL);
if(!dev){
return -EBUSY;
}
if((scc = kzalloc(sizeof(struct sb_card_config), GFP_KERNEL)) == NULL) {
printk(KERN_ERR "sb: Error: Could not allocate memory\n");
return -ENOMEM;
}
printk(KERN_INFO "sb: PnP: Found Card Named = \"%s\", Card PnP id = " \
"%s, Device PnP id = %s\n", card->card->name, card_id->id,
dev->id->id);
scc->card_id = card_id->id;
scc->dev_id = dev->id->id;
sb_dev2cfg(dev, scc);
printk(KERN_INFO "sb: PnP: Detected at: io=0x%x, irq=%d, " \
"dma=%d, dma16=%d\n", scc->conf.io_base, scc->conf.irq,
scc->conf.dma, scc->conf.dma2);
pnp_set_card_drvdata(card, scc);
sb_pnp_devices++;
return sb_register_oss(scc, &sbmo);
}
static void sb_pnp_remove(struct pnp_card_link *card)
{
struct sb_card_config *scc = pnp_get_card_drvdata(card);
if(!scc)
return;
printk(KERN_INFO "sb: PnP: Removing %s\n", scc->card_id);
sb_unload(scc);
}
static struct pnp_card_driver sb_pnp_driver = {
.name = "OSS SndBlstr", /* 16 character limit */
.id_table = sb_pnp_card_table,
.probe = sb_pnp_probe,
.remove = sb_pnp_remove,
};
MODULE_DEVICE_TABLE(pnp_card, sb_pnp_card_table);
#endif /* CONFIG_PNP */
static void sb_unregister_all(void)
{
#ifdef CONFIG_PNP
if (pnp_registered)
pnp_unregister_card_driver(&sb_pnp_driver);
#endif
}
static int __init sb_init(void)
{
int lres = 0;
int pres = 0;
printk(KERN_INFO "sb: Init: Starting Probe...\n");
if(io != -1 && irq != -1 && dma != -1) {
printk(KERN_INFO "sb: Probing legacy card with io=%x, "\
"irq=%d, dma=%d, dma16=%d\n",io, irq, dma, dma16);
lres = sb_init_legacy();
} else if((io != -1 || irq != -1 || dma != -1) ||
(!pnp && (io == -1 && irq == -1 && dma == -1)))
printk(KERN_ERR "sb: Error: At least io, irq, and dma "\
"must be set for legacy cards.\n");
#ifdef CONFIG_PNP
if(pnp) {
int err = pnp_register_card_driver(&sb_pnp_driver);
if (!err)
pnp_registered = 1;
pres = sb_pnp_devices;
}
#endif
printk(KERN_INFO "sb: Init: Done\n");
/* If either PnP or Legacy registered a card then return
* success */
if (pres == 0 && lres <= 0) {
sb_unregister_all();
return -ENODEV;
}
return 0;
}
static void __exit sb_exit(void)
{
printk(KERN_INFO "sb: Unloading...\n");
/* Unload legacy card */
if (legacy) {
printk (KERN_INFO "sb: Unloading legacy card\n");
sb_unload(legacy);
}
sb_unregister_all();
vfree(smw_free);
smw_free = NULL;
}
module_init(sb_init);
module_exit(sb_exit);
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