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remarkable-linux/sound/isa/gus/gusclassic.c
David Howells e992ef5705 Annotate hardware config module parameters in sound/isa/ 
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/isa/.

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: alsa-devel@alsa-project.org
2017-04-20 12:02:32 +01:00

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/*
* Driver for Gravis UltraSound Classic soundcard
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* 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 of the License, 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/init.h>
#include <linux/err.h>
#include <linux/isa.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/module.h>
#include <asm/dma.h>
#include <sound/core.h>
#include <sound/gus.h>
#define SNDRV_LEGACY_FIND_FREE_IRQ
#define SNDRV_LEGACY_FIND_FREE_DMA
#include <sound/initval.h>
#define CRD_NAME "Gravis UltraSound Classic"
#define DEV_NAME "gusclassic"
MODULE_DESCRIPTION(CRD_NAME);
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Gravis,UltraSound Classic}}");
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; /* 0x220,0x230,0x240,0x250,0x260 */
static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,5,9,11,12,15 */
static int dma1[SNDRV_CARDS] = SNDRV_DEFAULT_DMA; /* 1,3,5,6,7 */
static int dma2[SNDRV_CARDS] = SNDRV_DEFAULT_DMA; /* 1,3,5,6,7 */
static int joystick_dac[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 29};
/* 0 to 31, (0.59V-4.52V or 0.389V-2.98V) */
static int channels[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 24};
static int pcm_channels[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
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(irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(irq, "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.");
module_param_array(joystick_dac, int, NULL, 0444);
MODULE_PARM_DESC(joystick_dac, "Joystick DAC level 0.59V-4.52V or 0.389V-2.98V for " CRD_NAME " driver.");
module_param_array(channels, int, NULL, 0444);
MODULE_PARM_DESC(channels, "GF1 channels for " CRD_NAME " driver.");
module_param_array(pcm_channels, int, NULL, 0444);
MODULE_PARM_DESC(pcm_channels, "Reserved PCM channels for " CRD_NAME " driver.");
static int snd_gusclassic_match(struct device *dev, unsigned int n)
{
return enable[n];
}
static int snd_gusclassic_create(struct snd_card *card,
struct device *dev, unsigned int n,
struct snd_gus_card **rgus)
{
static long possible_ports[] = {0x220, 0x230, 0x240, 0x250, 0x260};
static int possible_irqs[] = {5, 11, 12, 9, 7, 15, 3, 4, -1};
static int possible_dmas[] = {5, 6, 7, 1, 3, -1};
int i, error;
if (irq[n] == SNDRV_AUTO_IRQ) {
irq[n] = snd_legacy_find_free_irq(possible_irqs);
if (irq[n] < 0) {
dev_err(dev, "unable to find a free IRQ\n");
return -EBUSY;
}
}
if (dma1[n] == SNDRV_AUTO_DMA) {
dma1[n] = snd_legacy_find_free_dma(possible_dmas);
if (dma1[n] < 0) {
dev_err(dev, "unable to find a free DMA1\n");
return -EBUSY;
}
}
if (dma2[n] == SNDRV_AUTO_DMA) {
dma2[n] = snd_legacy_find_free_dma(possible_dmas);
if (dma2[n] < 0) {
dev_err(dev, "unable to find a free DMA2\n");
return -EBUSY;
}
}
if (port[n] != SNDRV_AUTO_PORT)
return snd_gus_create(card, port[n], irq[n], dma1[n], dma2[n],
0, channels[n], pcm_channels[n], 0, rgus);
i = 0;
do {
port[n] = possible_ports[i];
error = snd_gus_create(card, port[n], irq[n], dma1[n], dma2[n],
0, channels[n], pcm_channels[n], 0, rgus);
} while (error < 0 && ++i < ARRAY_SIZE(possible_ports));
return error;
}
static int snd_gusclassic_detect(struct snd_gus_card *gus)
{
unsigned char d;
snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 0); /* reset GF1 */
if (((d = snd_gf1_i_look8(gus, SNDRV_GF1_GB_RESET)) & 0x07) != 0) {
snd_printdd("[0x%lx] check 1 failed - 0x%x\n", gus->gf1.port, d);
return -ENODEV;
}
udelay(160);
snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 1); /* release reset */
udelay(160);
if (((d = snd_gf1_i_look8(gus, SNDRV_GF1_GB_RESET)) & 0x07) != 1) {
snd_printdd("[0x%lx] check 2 failed - 0x%x\n", gus->gf1.port, d);
return -ENODEV;
}
return 0;
}
static int snd_gusclassic_probe(struct device *dev, unsigned int n)
{
struct snd_card *card;
struct snd_gus_card *gus;
int error;
error = snd_card_new(dev, index[n], id[n], THIS_MODULE, 0, &card);
if (error < 0)
return error;
if (pcm_channels[n] < 2)
pcm_channels[n] = 2;
error = snd_gusclassic_create(card, dev, n, &gus);
if (error < 0)
goto out;
error = snd_gusclassic_detect(gus);
if (error < 0)
goto out;
gus->joystick_dac = joystick_dac[n];
error = snd_gus_initialize(gus);
if (error < 0)
goto out;
error = -ENODEV;
if (gus->max_flag || gus->ess_flag) {
dev_err(dev, "GUS Classic or ACE soundcard was "
"not detected at 0x%lx\n", gus->gf1.port);
goto out;
}
error = snd_gf1_new_mixer(gus);
if (error < 0)
goto out;
error = snd_gf1_pcm_new(gus, 0, 0);
if (error < 0)
goto out;
if (!gus->ace_flag) {
error = snd_gf1_rawmidi_new(gus, 0);
if (error < 0)
goto out;
}
sprintf(card->longname + strlen(card->longname),
" at 0x%lx, irq %d, dma %d",
gus->gf1.port, gus->gf1.irq, gus->gf1.dma1);
if (gus->gf1.dma2 >= 0)
sprintf(card->longname + strlen(card->longname),
"&%d", gus->gf1.dma2);
error = snd_card_register(card);
if (error < 0)
goto out;
dev_set_drvdata(dev, card);
return 0;
out: snd_card_free(card);
return error;
}
static int snd_gusclassic_remove(struct device *dev, unsigned int n)
{
snd_card_free(dev_get_drvdata(dev));
return 0;
}
static struct isa_driver snd_gusclassic_driver = {
.match = snd_gusclassic_match,
.probe = snd_gusclassic_probe,
.remove = snd_gusclassic_remove,
#if 0 /* FIXME */
.suspend = snd_gusclassic_suspend,
.remove = snd_gusclassic_remove,
#endif
.driver = {
.name = DEV_NAME
}
};
module_isa_driver(snd_gusclassic_driver, SNDRV_CARDS);
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