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kernel-ark/sound/isa/cmi8328.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

473 lines
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/*
* Driver for C-Media CMI8328-based soundcards, such as AudioExcel AV500
* Copyright (c) 2012 Ondrej Zary
*
* AudioExcel AV500 card consists of:
* - CMI8328 - main chip (SB Pro emulation, gameport, OPL3, MPU401, CD-ROM)
* - CS4231A - WSS codec
* - Dream SAM9233+GMS950400+RAM+ROM: Wavetable MIDI, connected to MPU401
*/
#include <linux/init.h>
#include <linux/isa.h>
#include <linux/module.h>
#include <linux/gameport.h>
#include <asm/dma.h>
#include <sound/core.h>
#include <sound/wss.h>
#include <sound/opl3.h>
#include <sound/mpu401.h>
#define SNDRV_LEGACY_FIND_FREE_IOPORT
#define SNDRV_LEGACY_FIND_FREE_IRQ
#define SNDRV_LEGACY_FIND_FREE_DMA
#include <sound/initval.h>
MODULE_AUTHOR("Ondrej Zary <linux@rainbow-software.org>");
MODULE_DESCRIPTION("C-Media CMI8328");
MODULE_LICENSE("GPL");
#if defined(CONFIG_GAMEPORT) || defined(CONFIG_GAMEPORT_MODULE)
#define SUPPORT_JOYSTICK 1
#endif
/* I/O port is configured by jumpers on the card to one of these */
static int cmi8328_ports[] = { 0x530, 0xe80, 0xf40, 0x604 };
#define CMI8328_MAX ARRAY_SIZE(cmi8328_ports)
static int index[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = -1};
static char *id[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = NULL};
static long port[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = SNDRV_AUTO_PORT};
static int irq[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = SNDRV_AUTO_IRQ};
static int dma1[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = SNDRV_AUTO_DMA};
static int dma2[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = SNDRV_AUTO_DMA};
static long mpuport[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = SNDRV_AUTO_PORT};
static int mpuirq[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = SNDRV_AUTO_IRQ};
#ifdef SUPPORT_JOYSTICK
static bool gameport[CMI8328_MAX] = {[0 ... (CMI8328_MAX-1)] = true};
#endif
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for CMI8328 soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for CMI8328 soundcard.");
module_param_hw_array(port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(port, "Port # for CMI8328 driver.");
module_param_hw_array(irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(irq, "IRQ # for CMI8328 driver.");
module_param_hw_array(dma1, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma1, "DMA1 for CMI8328 driver.");
module_param_hw_array(dma2, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma2, "DMA2 for CMI8328 driver.");
module_param_hw_array(mpuport, long, ioport, NULL, 0444);
MODULE_PARM_DESC(mpuport, "MPU-401 port # for CMI8328 driver.");
module_param_hw_array(mpuirq, int, irq, NULL, 0444);
MODULE_PARM_DESC(mpuirq, "IRQ # for CMI8328 MPU-401 port.");
#ifdef SUPPORT_JOYSTICK
module_param_array(gameport, bool, NULL, 0444);
MODULE_PARM_DESC(gameport, "Enable gameport.");
#endif
struct snd_cmi8328 {
u16 port;
u8 cfg[3];
u8 wss_cfg;
struct snd_card *card;
struct snd_wss *wss;
#ifdef SUPPORT_JOYSTICK
struct gameport *gameport;
#endif
};
/* CMI8328 configuration registers */
#define CFG1 0x61
#define CFG1_SB_DISABLE (1 << 0)
#define CFG1_GAMEPORT (1 << 1)
/*
* bit 0: SB: 0=enabled, 1=disabled
* bit 1: gameport: 0=disabled, 1=enabled
* bits 2-4: SB IRQ: 001=3, 010=5, 011=7, 100=9, 101=10, 110=11
* bits 5-6: SB DMA: 00=disabled (when SB disabled), 01=DMA0, 10=DMA1, 11=DMA3
* bit 7: SB port: 0=0x220, 1=0x240
*/
#define CFG2 0x62
#define CFG2_MPU_ENABLE (1 << 2)
/*
* bits 0-1: CD-ROM mode: 00=disabled, 01=Panasonic, 10=Sony/Mitsumi/Wearnes,
11=IDE
* bit 2: MPU401: 0=disabled, 1=enabled
* bits 3-4: MPU401 IRQ: 00=3, 01=5, 10=7, 11=9,
* bits 5-7: MPU401 port: 000=0x300, 001=0x310, 010=0x320, 011=0x330, 100=0x332,
101=0x334, 110=0x336
*/
#define CFG3 0x63
/*
* bits 0-2: CD-ROM IRQ: 000=disabled, 001=3, 010=5, 011=7, 100=9, 101=10,
110=11
* bits 3-4: CD-ROM DMA: 00=disabled, 01=DMA0, 10=DMA1, 11=DMA3
* bits 5-7: CD-ROM port: 000=0x300, 001=0x310, 010=0x320, 011=0x330, 100=0x340,
101=0x350, 110=0x360, 111=0x370
*/
static u8 snd_cmi8328_cfg_read(u16 port, u8 reg)
{
outb(0x43, port + 3);
outb(0x21, port + 3);
outb(reg, port + 3);
return inb(port);
}
static void snd_cmi8328_cfg_write(u16 port, u8 reg, u8 val)
{
outb(0x43, port + 3);
outb(0x21, port + 3);
outb(reg, port + 3);
outb(val, port + 3); /* yes, value goes to the same port as index */
}
#ifdef CONFIG_PM
static void snd_cmi8328_cfg_save(u16 port, u8 cfg[])
{
cfg[0] = snd_cmi8328_cfg_read(port, CFG1);
cfg[1] = snd_cmi8328_cfg_read(port, CFG2);
cfg[2] = snd_cmi8328_cfg_read(port, CFG3);
}
static void snd_cmi8328_cfg_restore(u16 port, u8 cfg[])
{
snd_cmi8328_cfg_write(port, CFG1, cfg[0]);
snd_cmi8328_cfg_write(port, CFG2, cfg[1]);
snd_cmi8328_cfg_write(port, CFG3, cfg[2]);
}
#endif /* CONFIG_PM */
static int snd_cmi8328_mixer(struct snd_wss *chip)
{
struct snd_card *card;
struct snd_ctl_elem_id id1, id2;
int err;
card = chip->card;
memset(&id1, 0, sizeof(id1));
memset(&id2, 0, sizeof(id2));
id1.iface = id2.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
/* rename AUX0 switch to CD */
strcpy(id1.name, "Aux Playback Switch");
strcpy(id2.name, "CD Playback Switch");
err = snd_ctl_rename_id(card, &id1, &id2);
if (err < 0) {
snd_printk(KERN_ERR "error renaming control\n");
return err;
}
/* rename AUX0 volume to CD */
strcpy(id1.name, "Aux Playback Volume");
strcpy(id2.name, "CD Playback Volume");
err = snd_ctl_rename_id(card, &id1, &id2);
if (err < 0) {
snd_printk(KERN_ERR "error renaming control\n");
return err;
}
/* rename AUX1 switch to Synth */
strcpy(id1.name, "Aux Playback Switch");
id1.index = 1;
strcpy(id2.name, "Synth Playback Switch");
err = snd_ctl_rename_id(card, &id1, &id2);
if (err < 0) {
snd_printk(KERN_ERR "error renaming control\n");
return err;
}
/* rename AUX1 volume to Synth */
strcpy(id1.name, "Aux Playback Volume");
id1.index = 1;
strcpy(id2.name, "Synth Playback Volume");
err = snd_ctl_rename_id(card, &id1, &id2);
if (err < 0) {
snd_printk(KERN_ERR "error renaming control\n");
return err;
}
return 0;
}
/* find index of an item in "-1"-ended array */
int array_find(int array[], int item)
{
int i;
for (i = 0; array[i] != -1; i++)
if (array[i] == item)
return i;
return -1;
}
/* the same for long */
int array_find_l(long array[], long item)
{
int i;
for (i = 0; array[i] != -1; i++)
if (array[i] == item)
return i;
return -1;
}
static int snd_cmi8328_probe(struct device *pdev, unsigned int ndev)
{
struct snd_card *card;
struct snd_opl3 *opl3;
struct snd_cmi8328 *cmi;
#ifdef SUPPORT_JOYSTICK
struct resource *res;
#endif
int err, pos;
static long mpu_ports[] = { 0x330, 0x300, 0x310, 0x320, 0x332, 0x334,
0x336, -1 };
static u8 mpu_port_bits[] = { 3, 0, 1, 2, 4, 5, 6 };
static int mpu_irqs[] = { 9, 7, 5, 3, -1 };
static u8 mpu_irq_bits[] = { 3, 2, 1, 0 };
static int irqs[] = { 9, 10, 11, 7, -1 };
static u8 irq_bits[] = { 2, 3, 4, 1 };
static int dma1s[] = { 3, 1, 0, -1 };
static u8 dma_bits[] = { 3, 2, 1 };
static int dma2s[][2] = { {1, -1}, {0, -1}, {-1, -1}, {0, -1} };
u16 port = cmi8328_ports[ndev];
u8 val;
/* 0xff is invalid configuration (but settable - hope it isn't set) */
if (snd_cmi8328_cfg_read(port, CFG1) == 0xff)
return -ENODEV;
/* the SB disable bit must NEVER EVER be cleared or the WSS dies */
snd_cmi8328_cfg_write(port, CFG1, CFG1_SB_DISABLE);
if (snd_cmi8328_cfg_read(port, CFG1) != CFG1_SB_DISABLE)
return -ENODEV;
/* disable everything first */
snd_cmi8328_cfg_write(port, CFG2, 0); /* disable CDROM and MPU401 */
snd_cmi8328_cfg_write(port, CFG3, 0); /* disable CDROM IRQ and DMA */
if (irq[ndev] == SNDRV_AUTO_IRQ) {
irq[ndev] = snd_legacy_find_free_irq(irqs);
if (irq[ndev] < 0) {
snd_printk(KERN_ERR "unable to find a free IRQ\n");
return -EBUSY;
}
}
if (dma1[ndev] == SNDRV_AUTO_DMA) {
dma1[ndev] = snd_legacy_find_free_dma(dma1s);
if (dma1[ndev] < 0) {
snd_printk(KERN_ERR "unable to find a free DMA1\n");
return -EBUSY;
}
}
if (dma2[ndev] == SNDRV_AUTO_DMA) {
dma2[ndev] = snd_legacy_find_free_dma(dma2s[dma1[ndev] % 4]);
if (dma2[ndev] < 0) {
snd_printk(KERN_WARNING "unable to find a free DMA2, full-duplex will not work\n");
dma2[ndev] = -1;
}
}
/* configure WSS IRQ... */
pos = array_find(irqs, irq[ndev]);
if (pos < 0) {
snd_printk(KERN_ERR "invalid IRQ %d\n", irq[ndev]);
return -EINVAL;
}
val = irq_bits[pos] << 3;
/* ...and DMA... */
pos = array_find(dma1s, dma1[ndev]);
if (pos < 0) {
snd_printk(KERN_ERR "invalid DMA1 %d\n", dma1[ndev]);
return -EINVAL;
}
val |= dma_bits[pos];
/* ...and DMA2 */
if (dma2[ndev] >= 0 && dma1[ndev] != dma2[ndev]) {
pos = array_find(dma2s[dma1[ndev]], dma2[ndev]);
if (pos < 0) {
snd_printk(KERN_ERR "invalid DMA2 %d\n", dma2[ndev]);
return -EINVAL;
}
val |= 0x04; /* enable separate capture DMA */
}
outb(val, port);
err = snd_card_new(pdev, index[ndev], id[ndev], THIS_MODULE,
sizeof(struct snd_cmi8328), &card);
if (err < 0)
return err;
cmi = card->private_data;
cmi->card = card;
cmi->port = port;
cmi->wss_cfg = val;
err = snd_wss_create(card, port + 4, -1, irq[ndev], dma1[ndev],
dma2[ndev], WSS_HW_DETECT, 0, &cmi->wss);
if (err < 0)
goto error;
err = snd_wss_pcm(cmi->wss, 0);
if (err < 0)
goto error;
err = snd_wss_mixer(cmi->wss);
if (err < 0)
goto error;
err = snd_cmi8328_mixer(cmi->wss);
if (err < 0)
goto error;
if (snd_wss_timer(cmi->wss, 0) < 0)
snd_printk(KERN_WARNING "error initializing WSS timer\n");
if (mpuport[ndev] == SNDRV_AUTO_PORT) {
mpuport[ndev] = snd_legacy_find_free_ioport(mpu_ports, 2);
if (mpuport[ndev] < 0)
snd_printk(KERN_ERR "unable to find a free MPU401 port\n");
}
if (mpuirq[ndev] == SNDRV_AUTO_IRQ) {
mpuirq[ndev] = snd_legacy_find_free_irq(mpu_irqs);
if (mpuirq[ndev] < 0)
snd_printk(KERN_ERR "unable to find a free MPU401 IRQ\n");
}
/* enable and configure MPU401 */
if (mpuport[ndev] > 0 && mpuirq[ndev] > 0) {
val = CFG2_MPU_ENABLE;
pos = array_find_l(mpu_ports, mpuport[ndev]);
if (pos < 0)
snd_printk(KERN_WARNING "invalid MPU401 port 0x%lx\n",
mpuport[ndev]);
else {
val |= mpu_port_bits[pos] << 5;
pos = array_find(mpu_irqs, mpuirq[ndev]);
if (pos < 0)
snd_printk(KERN_WARNING "invalid MPU401 IRQ %d\n",
mpuirq[ndev]);
else {
val |= mpu_irq_bits[pos] << 3;
snd_cmi8328_cfg_write(port, CFG2, val);
if (snd_mpu401_uart_new(card, 0,
MPU401_HW_MPU401, mpuport[ndev],
0, mpuirq[ndev], NULL) < 0)
snd_printk(KERN_ERR "error initializing MPU401\n");
}
}
}
/* OPL3 is hardwired to 0x388 and cannot be disabled */
if (snd_opl3_create(card, 0x388, 0x38a, OPL3_HW_AUTO, 0, &opl3) < 0)
snd_printk(KERN_ERR "error initializing OPL3\n");
else
if (snd_opl3_hwdep_new(opl3, 0, 1, NULL) < 0)
snd_printk(KERN_WARNING "error initializing OPL3 hwdep\n");
strcpy(card->driver, "CMI8328");
strcpy(card->shortname, "C-Media CMI8328");
sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d,%d",
card->shortname, cmi->wss->port, irq[ndev], dma1[ndev],
(dma2[ndev] >= 0) ? dma2[ndev] : dma1[ndev]);
dev_set_drvdata(pdev, card);
err = snd_card_register(card);
if (err < 0)
goto error;
#ifdef SUPPORT_JOYSTICK
if (!gameport[ndev])
return 0;
/* gameport is hardwired to 0x200 */
res = request_region(0x200, 8, "CMI8328 gameport");
if (!res)
snd_printk(KERN_WARNING "unable to allocate gameport I/O port\n");
else {
struct gameport *gp = cmi->gameport = gameport_allocate_port();
if (!cmi->gameport)
release_and_free_resource(res);
else {
gameport_set_name(gp, "CMI8328 Gameport");
gameport_set_phys(gp, "%s/gameport0", dev_name(pdev));
gameport_set_dev_parent(gp, pdev);
gp->io = 0x200;
gameport_set_port_data(gp, res);
/* Enable gameport */
snd_cmi8328_cfg_write(port, CFG1,
CFG1_SB_DISABLE | CFG1_GAMEPORT);
gameport_register_port(gp);
}
}
#endif
return 0;
error:
snd_card_free(card);
return err;
}
static int snd_cmi8328_remove(struct device *pdev, unsigned int dev)
{
struct snd_card *card = dev_get_drvdata(pdev);
struct snd_cmi8328 *cmi = card->private_data;
#ifdef SUPPORT_JOYSTICK
if (cmi->gameport) {
struct resource *res = gameport_get_port_data(cmi->gameport);
gameport_unregister_port(cmi->gameport);
release_and_free_resource(res);
}
#endif
/* disable everything */
snd_cmi8328_cfg_write(cmi->port, CFG1, CFG1_SB_DISABLE);
snd_cmi8328_cfg_write(cmi->port, CFG2, 0);
snd_cmi8328_cfg_write(cmi->port, CFG3, 0);
snd_card_free(card);
return 0;
}
#ifdef CONFIG_PM
static int snd_cmi8328_suspend(struct device *pdev, unsigned int n,
pm_message_t state)
{
struct snd_card *card = dev_get_drvdata(pdev);
struct snd_cmi8328 *cmi;
if (!card) /* ignore absent devices */
return 0;
cmi = card->private_data;
snd_cmi8328_cfg_save(cmi->port, cmi->cfg);
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
snd_pcm_suspend_all(cmi->wss->pcm);
cmi->wss->suspend(cmi->wss);
return 0;
}
static int snd_cmi8328_resume(struct device *pdev, unsigned int n)
{
struct snd_card *card = dev_get_drvdata(pdev);
struct snd_cmi8328 *cmi;
if (!card) /* ignore absent devices */
return 0;
cmi = card->private_data;
snd_cmi8328_cfg_restore(cmi->port, cmi->cfg);
outb(cmi->wss_cfg, cmi->port);
cmi->wss->resume(cmi->wss);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
#endif
static struct isa_driver snd_cmi8328_driver = {
.probe = snd_cmi8328_probe,
.remove = snd_cmi8328_remove,
#ifdef CONFIG_PM
.suspend = snd_cmi8328_suspend,
.resume = snd_cmi8328_resume,
#endif
.driver = {
.name = "cmi8328"
},
};
module_isa_driver(snd_cmi8328_driver, CMI8328_MAX);
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