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linux/sound/isa/sb/jazz16.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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/*
* jazz16.c - driver for Media Vision Jazz16 based soundcards.
* Copyright (C) 2009 Krzysztof Helt <krzysztof.h1@wp.pl>
* Based on patches posted by Rask Ingemann Lambertsen and Rene Herman.
* Based on OSS Sound Blaster driver.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <asm/dma.h>
#include <linux/isa.h>
#include <sound/core.h>
#include <sound/mpu401.h>
#include <sound/opl3.h>
#include <sound/sb.h>
#define SNDRV_LEGACY_FIND_FREE_IRQ
#define SNDRV_LEGACY_FIND_FREE_DMA
#include <sound/initval.h>
#define PFX "jazz16: "
MODULE_DESCRIPTION("Media Vision Jazz16");
MODULE_SUPPORTED_DEVICE("{{Media Vision ??? },"
"{RTL,RTL3000}}");
MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
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 unsigned long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;
static unsigned long mpu_port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;
static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;
static int mpu_irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;
static int dma8[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;
static int dma16[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Media Vision Jazz16 based soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for Media Vision Jazz16 based soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable Media Vision Jazz16 based soundcard.");
module_param_hw_array(port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(port, "Port # for jazz16 driver.");
module_param_hw_array(mpu_port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(mpu_port, "MPU-401 port # for jazz16 driver.");
module_param_hw_array(irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(irq, "IRQ # for jazz16 driver.");
module_param_hw_array(mpu_irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(mpu_irq, "MPU-401 IRQ # for jazz16 driver.");
module_param_hw_array(dma8, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma8, "DMA8 # for jazz16 driver.");
module_param_hw_array(dma16, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma16, "DMA16 # for jazz16 driver.");
#define SB_JAZZ16_WAKEUP 0xaf
#define SB_JAZZ16_SET_PORTS 0x50
#define SB_DSP_GET_JAZZ_BRD_REV 0xfa
#define SB_JAZZ16_SET_DMAINTR 0xfb
#define SB_DSP_GET_JAZZ_MODEL 0xfe
struct snd_card_jazz16 {
struct snd_sb *chip;
};
static irqreturn_t jazz16_interrupt(int irq, void *chip)
{
return snd_sb8dsp_interrupt(chip);
}
static int jazz16_configure_ports(unsigned long port,
unsigned long mpu_port, int idx)
{
unsigned char val;
if (!request_region(0x201, 1, "jazz16 config")) {
snd_printk(KERN_ERR "config port region is already in use.\n");
return -EBUSY;
}
outb(SB_JAZZ16_WAKEUP - idx, 0x201);
udelay(100);
outb(SB_JAZZ16_SET_PORTS + idx, 0x201);
udelay(100);
val = port & 0x70;
val |= (mpu_port & 0x30) >> 4;
outb(val, 0x201);
release_region(0x201, 1);
return 0;
}
static int jazz16_detect_board(unsigned long port,
unsigned long mpu_port)
{
int err;
int val;
struct snd_sb chip;
if (!request_region(port, 0x10, "jazz16")) {
snd_printk(KERN_ERR "I/O port region is already in use.\n");
return -EBUSY;
}
/* just to call snd_sbdsp_command/reset/get_byte() */
chip.port = port;
err = snd_sbdsp_reset(&chip);
if (err < 0)
for (val = 0; val < 4; val++) {
err = jazz16_configure_ports(port, mpu_port, val);
if (err < 0)
break;
err = snd_sbdsp_reset(&chip);
if (!err)
break;
}
if (err < 0) {
err = -ENODEV;
goto err_unmap;
}
if (!snd_sbdsp_command(&chip, SB_DSP_GET_JAZZ_BRD_REV)) {
err = -EBUSY;
goto err_unmap;
}
val = snd_sbdsp_get_byte(&chip);
if (val >= 0x30)
snd_sbdsp_get_byte(&chip);
if ((val & 0xf0) != 0x10) {
err = -ENODEV;
goto err_unmap;
}
if (!snd_sbdsp_command(&chip, SB_DSP_GET_JAZZ_MODEL)) {
err = -EBUSY;
goto err_unmap;
}
snd_sbdsp_get_byte(&chip);
err = snd_sbdsp_get_byte(&chip);
snd_printd("Media Vision Jazz16 board detected: rev 0x%x, model 0x%x\n",
val, err);
err = 0;
err_unmap:
release_region(port, 0x10);
return err;
}
static int jazz16_configure_board(struct snd_sb *chip, int mpu_irq)
{
static unsigned char jazz_irq_bits[] = { 0, 0, 2, 3, 0, 1, 0, 4,
0, 2, 5, 0, 0, 0, 0, 6 };
static unsigned char jazz_dma_bits[] = { 0, 1, 0, 2, 0, 3, 0, 4 };
if (jazz_dma_bits[chip->dma8] == 0 ||
jazz_dma_bits[chip->dma16] == 0 ||
jazz_irq_bits[chip->irq] == 0)
return -EINVAL;
if (!snd_sbdsp_command(chip, SB_JAZZ16_SET_DMAINTR))
return -EBUSY;
if (!snd_sbdsp_command(chip,
jazz_dma_bits[chip->dma8] |
(jazz_dma_bits[chip->dma16] << 4)))
return -EBUSY;
if (!snd_sbdsp_command(chip,
jazz_irq_bits[chip->irq] |
(jazz_irq_bits[mpu_irq] << 4)))
return -EBUSY;
return 0;
}
static int snd_jazz16_match(struct device *devptr, unsigned int dev)
{
if (!enable[dev])
return 0;
if (port[dev] == SNDRV_AUTO_PORT) {
snd_printk(KERN_ERR "please specify port\n");
return 0;
} else if (port[dev] == 0x200 || (port[dev] & ~0x270)) {
snd_printk(KERN_ERR "incorrect port specified\n");
return 0;
}
if (dma8[dev] != SNDRV_AUTO_DMA &&
dma8[dev] != 1 && dma8[dev] != 3) {
snd_printk(KERN_ERR "dma8 must be 1 or 3\n");
return 0;
}
if (dma16[dev] != SNDRV_AUTO_DMA &&
dma16[dev] != 5 && dma16[dev] != 7) {
snd_printk(KERN_ERR "dma16 must be 5 or 7\n");
return 0;
}
if (mpu_port[dev] != SNDRV_AUTO_PORT &&
(mpu_port[dev] & ~0x030) != 0x300) {
snd_printk(KERN_ERR "incorrect mpu_port specified\n");
return 0;
}
if (mpu_irq[dev] != SNDRV_AUTO_DMA &&
mpu_irq[dev] != 2 && mpu_irq[dev] != 3 &&
mpu_irq[dev] != 5 && mpu_irq[dev] != 7) {
snd_printk(KERN_ERR "mpu_irq must be 2, 3, 5 or 7\n");
return 0;
}
return 1;
}
static int snd_jazz16_probe(struct device *devptr, unsigned int dev)
{
struct snd_card *card;
struct snd_card_jazz16 *jazz16;
struct snd_sb *chip;
struct snd_opl3 *opl3;
static int possible_irqs[] = {2, 3, 5, 7, 9, 10, 15, -1};
static int possible_dmas8[] = {1, 3, -1};
static int possible_dmas16[] = {5, 7, -1};
int err, xirq, xdma8, xdma16, xmpu_port, xmpu_irq;
err = snd_card_new(devptr, index[dev], id[dev], THIS_MODULE,
sizeof(struct snd_card_jazz16), &card);
if (err < 0)
return err;
jazz16 = card->private_data;
xirq = irq[dev];
if (xirq == SNDRV_AUTO_IRQ) {
xirq = snd_legacy_find_free_irq(possible_irqs);
if (xirq < 0) {
snd_printk(KERN_ERR "unable to find a free IRQ\n");
err = -EBUSY;
goto err_free;
}
}
xdma8 = dma8[dev];
if (xdma8 == SNDRV_AUTO_DMA) {
xdma8 = snd_legacy_find_free_dma(possible_dmas8);
if (xdma8 < 0) {
snd_printk(KERN_ERR "unable to find a free DMA8\n");
err = -EBUSY;
goto err_free;
}
}
xdma16 = dma16[dev];
if (xdma16 == SNDRV_AUTO_DMA) {
xdma16 = snd_legacy_find_free_dma(possible_dmas16);
if (xdma16 < 0) {
snd_printk(KERN_ERR "unable to find a free DMA16\n");
err = -EBUSY;
goto err_free;
}
}
xmpu_port = mpu_port[dev];
if (xmpu_port == SNDRV_AUTO_PORT)
xmpu_port = 0;
err = jazz16_detect_board(port[dev], xmpu_port);
if (err < 0) {
printk(KERN_ERR "Media Vision Jazz16 board not detected\n");
goto err_free;
}
err = snd_sbdsp_create(card, port[dev], irq[dev],
jazz16_interrupt,
dma8[dev], dma16[dev],
SB_HW_JAZZ16,
&chip);
if (err < 0)
goto err_free;
xmpu_irq = mpu_irq[dev];
if (xmpu_irq == SNDRV_AUTO_IRQ || mpu_port[dev] == SNDRV_AUTO_PORT)
xmpu_irq = 0;
err = jazz16_configure_board(chip, xmpu_irq);
if (err < 0) {
printk(KERN_ERR "Media Vision Jazz16 configuration failed\n");
goto err_free;
}
jazz16->chip = chip;
strcpy(card->driver, "jazz16");
strcpy(card->shortname, "Media Vision Jazz16");
sprintf(card->longname,
"Media Vision Jazz16 at 0x%lx, irq %d, dma8 %d, dma16 %d",
port[dev], xirq, xdma8, xdma16);
err = snd_sb8dsp_pcm(chip, 0);
if (err < 0)
goto err_free;
err = snd_sbmixer_new(chip);
if (err < 0)
goto err_free;
err = snd_opl3_create(card, chip->port, chip->port + 2,
OPL3_HW_AUTO, 1, &opl3);
if (err < 0)
snd_printk(KERN_WARNING "no OPL device at 0x%lx-0x%lx\n",
chip->port, chip->port + 2);
else {
err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
if (err < 0)
goto err_free;
}
if (mpu_port[dev] > 0 && mpu_port[dev] != SNDRV_AUTO_PORT) {
if (mpu_irq[dev] == SNDRV_AUTO_IRQ)
mpu_irq[dev] = -1;
if (snd_mpu401_uart_new(card, 0,
MPU401_HW_MPU401,
mpu_port[dev], 0,
mpu_irq[dev],
NULL) < 0)
snd_printk(KERN_ERR "no MPU-401 device at 0x%lx\n",
mpu_port[dev]);
}
err = snd_card_register(card);
if (err < 0)
goto err_free;
dev_set_drvdata(devptr, card);
return 0;
err_free:
snd_card_free(card);
return err;
}
static int snd_jazz16_remove(struct device *devptr, unsigned int dev)
{
struct snd_card *card = dev_get_drvdata(devptr);
snd_card_free(card);
return 0;
}
#ifdef CONFIG_PM
static int snd_jazz16_suspend(struct device *pdev, unsigned int n,
pm_message_t state)
{
struct snd_card *card = dev_get_drvdata(pdev);
struct snd_card_jazz16 *acard = card->private_data;
struct snd_sb *chip = acard->chip;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
snd_pcm_suspend_all(chip->pcm);
snd_sbmixer_suspend(chip);
return 0;
}
static int snd_jazz16_resume(struct device *pdev, unsigned int n)
{
struct snd_card *card = dev_get_drvdata(pdev);
struct snd_card_jazz16 *acard = card->private_data;
struct snd_sb *chip = acard->chip;
snd_sbdsp_reset(chip);
snd_sbmixer_resume(chip);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
#endif
static struct isa_driver snd_jazz16_driver = {
.match = snd_jazz16_match,
.probe = snd_jazz16_probe,
.remove = snd_jazz16_remove,
#ifdef CONFIG_PM
.suspend = snd_jazz16_suspend,
.resume = snd_jazz16_resume,
#endif
.driver = {
.name = "jazz16"
},
};
module_isa_driver(snd_jazz16_driver, SNDRV_CARDS);
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