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alistair23-linux/sound/pci/ymfpci/ymfpci.c
David Howells 6192c41fc6 Annotate hardware config module parameters in sound/pci/ 
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/pci/.

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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/*
* The driver for the Yamaha's DS1/DS1E cards
* 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/pci.h>
#include <linux/time.h>
#include <linux/module.h>
#include <sound/core.h>
#include "ymfpci.h"
#include <sound/mpu401.h>
#include <sound/opl3.h>
#include <sound/initval.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Yamaha DS-1 PCI");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Yamaha,YMF724},"
"{Yamaha,YMF724F},"
"{Yamaha,YMF740},"
"{Yamaha,YMF740C},"
"{Yamaha,YMF744},"
"{Yamaha,YMF754}}");
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_PNP; /* Enable this card */
static long fm_port[SNDRV_CARDS];
static long mpu_port[SNDRV_CARDS];
#ifdef SUPPORT_JOYSTICK
static long joystick_port[SNDRV_CARDS];
#endif
static bool rear_switch[SNDRV_CARDS];
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for the Yamaha DS-1 PCI soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for the Yamaha DS-1 PCI soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable Yamaha DS-1 soundcard.");
module_param_hw_array(mpu_port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(mpu_port, "MPU-401 Port.");
module_param_hw_array(fm_port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(fm_port, "FM OPL-3 Port.");
#ifdef SUPPORT_JOYSTICK
module_param_hw_array(joystick_port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(joystick_port, "Joystick port address");
#endif
module_param_array(rear_switch, bool, NULL, 0444);
MODULE_PARM_DESC(rear_switch, "Enable shared rear/line-in switch");
static const struct pci_device_id snd_ymfpci_ids[] = {
{ PCI_VDEVICE(YAMAHA, 0x0004), 0, }, /* YMF724 */
{ PCI_VDEVICE(YAMAHA, 0x000d), 0, }, /* YMF724F */
{ PCI_VDEVICE(YAMAHA, 0x000a), 0, }, /* YMF740 */
{ PCI_VDEVICE(YAMAHA, 0x000c), 0, }, /* YMF740C */
{ PCI_VDEVICE(YAMAHA, 0x0010), 0, }, /* YMF744 */
{ PCI_VDEVICE(YAMAHA, 0x0012), 0, }, /* YMF754 */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, snd_ymfpci_ids);
#ifdef SUPPORT_JOYSTICK
static int snd_ymfpci_create_gameport(struct snd_ymfpci *chip, int dev,
int legacy_ctrl, int legacy_ctrl2)
{
struct gameport *gp;
struct resource *r = NULL;
int io_port = joystick_port[dev];
if (!io_port)
return -ENODEV;
if (chip->pci->device >= 0x0010) { /* YMF 744/754 */
if (io_port == 1) {
/* auto-detect */
if (!(io_port = pci_resource_start(chip->pci, 2)))
return -ENODEV;
}
} else {
if (io_port == 1) {
/* auto-detect */
for (io_port = 0x201; io_port <= 0x205; io_port++) {
if (io_port == 0x203)
continue;
if ((r = request_region(io_port, 1, "YMFPCI gameport")) != NULL)
break;
}
if (!r) {
dev_err(chip->card->dev,
"no gameport ports available\n");
return -EBUSY;
}
}
switch (io_port) {
case 0x201: legacy_ctrl2 |= 0 << 6; break;
case 0x202: legacy_ctrl2 |= 1 << 6; break;
case 0x204: legacy_ctrl2 |= 2 << 6; break;
case 0x205: legacy_ctrl2 |= 3 << 6; break;
default:
dev_err(chip->card->dev,
"invalid joystick port %#x", io_port);
return -EINVAL;
}
}
if (!r && !(r = request_region(io_port, 1, "YMFPCI gameport"))) {
dev_err(chip->card->dev,
"joystick port %#x is in use.\n", io_port);
return -EBUSY;
}
chip->gameport = gp = gameport_allocate_port();
if (!gp) {
dev_err(chip->card->dev,
"cannot allocate memory for gameport\n");
release_and_free_resource(r);
return -ENOMEM;
}
gameport_set_name(gp, "Yamaha YMF Gameport");
gameport_set_phys(gp, "pci%s/gameport0", pci_name(chip->pci));
gameport_set_dev_parent(gp, &chip->pci->dev);
gp->io = io_port;
gameport_set_port_data(gp, r);
if (chip->pci->device >= 0x0010) /* YMF 744/754 */
pci_write_config_word(chip->pci, PCIR_DSXG_JOYBASE, io_port);
pci_write_config_word(chip->pci, PCIR_DSXG_LEGACY, legacy_ctrl | YMFPCI_LEGACY_JPEN);
pci_write_config_word(chip->pci, PCIR_DSXG_ELEGACY, legacy_ctrl2);
gameport_register_port(chip->gameport);
return 0;
}
void snd_ymfpci_free_gameport(struct snd_ymfpci *chip)
{
if (chip->gameport) {
struct resource *r = gameport_get_port_data(chip->gameport);
gameport_unregister_port(chip->gameport);
chip->gameport = NULL;
release_and_free_resource(r);
}
}
#else
static inline int snd_ymfpci_create_gameport(struct snd_ymfpci *chip, int dev, int l, int l2) { return -ENOSYS; }
void snd_ymfpci_free_gameport(struct snd_ymfpci *chip) { }
#endif /* SUPPORT_JOYSTICK */
static int snd_card_ymfpci_probe(struct pci_dev *pci,
const struct pci_device_id *pci_id)
{
static int dev;
struct snd_card *card;
struct resource *fm_res = NULL;
struct resource *mpu_res = NULL;
struct snd_ymfpci *chip;
struct snd_opl3 *opl3;
const char *str, *model;
int err;
u16 legacy_ctrl, legacy_ctrl2, old_legacy_ctrl;
if (dev >= SNDRV_CARDS)
return -ENODEV;
if (!enable[dev]) {
dev++;
return -ENOENT;
}
err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
0, &card);
if (err < 0)
return err;
switch (pci_id->device) {
case 0x0004: str = "YMF724"; model = "DS-1"; break;
case 0x000d: str = "YMF724F"; model = "DS-1"; break;
case 0x000a: str = "YMF740"; model = "DS-1L"; break;
case 0x000c: str = "YMF740C"; model = "DS-1L"; break;
case 0x0010: str = "YMF744"; model = "DS-1S"; break;
case 0x0012: str = "YMF754"; model = "DS-1E"; break;
default: model = str = "???"; break;
}
legacy_ctrl = 0;
legacy_ctrl2 = 0x0800; /* SBEN = 0, SMOD = 01, LAD = 0 */
if (pci_id->device >= 0x0010) { /* YMF 744/754 */
if (fm_port[dev] == 1) {
/* auto-detect */
fm_port[dev] = pci_resource_start(pci, 1);
}
if (fm_port[dev] > 0 &&
(fm_res = request_region(fm_port[dev], 4, "YMFPCI OPL3")) != NULL) {
legacy_ctrl |= YMFPCI_LEGACY_FMEN;
pci_write_config_word(pci, PCIR_DSXG_FMBASE, fm_port[dev]);
}
if (mpu_port[dev] == 1) {
/* auto-detect */
mpu_port[dev] = pci_resource_start(pci, 1) + 0x20;
}
if (mpu_port[dev] > 0 &&
(mpu_res = request_region(mpu_port[dev], 2, "YMFPCI MPU401")) != NULL) {
legacy_ctrl |= YMFPCI_LEGACY_MEN;
pci_write_config_word(pci, PCIR_DSXG_MPU401BASE, mpu_port[dev]);
}
} else {
switch (fm_port[dev]) {
case 0x388: legacy_ctrl2 |= 0; break;
case 0x398: legacy_ctrl2 |= 1; break;
case 0x3a0: legacy_ctrl2 |= 2; break;
case 0x3a8: legacy_ctrl2 |= 3; break;
default: fm_port[dev] = 0; break;
}
if (fm_port[dev] > 0 &&
(fm_res = request_region(fm_port[dev], 4, "YMFPCI OPL3")) != NULL) {
legacy_ctrl |= YMFPCI_LEGACY_FMEN;
} else {
legacy_ctrl2 &= ~YMFPCI_LEGACY2_FMIO;
fm_port[dev] = 0;
}
switch (mpu_port[dev]) {
case 0x330: legacy_ctrl2 |= 0 << 4; break;
case 0x300: legacy_ctrl2 |= 1 << 4; break;
case 0x332: legacy_ctrl2 |= 2 << 4; break;
case 0x334: legacy_ctrl2 |= 3 << 4; break;
default: mpu_port[dev] = 0; break;
}
if (mpu_port[dev] > 0 &&
(mpu_res = request_region(mpu_port[dev], 2, "YMFPCI MPU401")) != NULL) {
legacy_ctrl |= YMFPCI_LEGACY_MEN;
} else {
legacy_ctrl2 &= ~YMFPCI_LEGACY2_MPUIO;
mpu_port[dev] = 0;
}
}
if (mpu_res) {
legacy_ctrl |= YMFPCI_LEGACY_MIEN;
legacy_ctrl2 |= YMFPCI_LEGACY2_IMOD;
}
pci_read_config_word(pci, PCIR_DSXG_LEGACY, &old_legacy_ctrl);
pci_write_config_word(pci, PCIR_DSXG_LEGACY, legacy_ctrl);
pci_write_config_word(pci, PCIR_DSXG_ELEGACY, legacy_ctrl2);
if ((err = snd_ymfpci_create(card, pci,
old_legacy_ctrl,
&chip)) < 0) {
snd_card_free(card);
release_and_free_resource(mpu_res);
release_and_free_resource(fm_res);
return err;
}
chip->fm_res = fm_res;
chip->mpu_res = mpu_res;
card->private_data = chip;
strcpy(card->driver, str);
sprintf(card->shortname, "Yamaha %s (%s)", model, str);
sprintf(card->longname, "%s at 0x%lx, irq %i",
card->shortname,
chip->reg_area_phys,
chip->irq);
if ((err = snd_ymfpci_pcm(chip, 0)) < 0) {
snd_card_free(card);
return err;
}
if ((err = snd_ymfpci_pcm_spdif(chip, 1)) < 0) {
snd_card_free(card);
return err;
}
err = snd_ymfpci_mixer(chip, rear_switch[dev]);
if (err < 0) {
snd_card_free(card);
return err;
}
if (chip->ac97->ext_id & AC97_EI_SDAC) {
err = snd_ymfpci_pcm_4ch(chip, 2);
if (err < 0) {
snd_card_free(card);
return err;
}
err = snd_ymfpci_pcm2(chip, 3);
if (err < 0) {
snd_card_free(card);
return err;
}
}
if ((err = snd_ymfpci_timer(chip, 0)) < 0) {
snd_card_free(card);
return err;
}
if (chip->mpu_res) {
if ((err = snd_mpu401_uart_new(card, 0, MPU401_HW_YMFPCI,
mpu_port[dev],
MPU401_INFO_INTEGRATED |
MPU401_INFO_IRQ_HOOK,
-1, &chip->rawmidi)) < 0) {
dev_warn(card->dev,
"cannot initialize MPU401 at 0x%lx, skipping...\n",
mpu_port[dev]);
legacy_ctrl &= ~YMFPCI_LEGACY_MIEN; /* disable MPU401 irq */
pci_write_config_word(pci, PCIR_DSXG_LEGACY, legacy_ctrl);
}
}
if (chip->fm_res) {
if ((err = snd_opl3_create(card,
fm_port[dev],
fm_port[dev] + 2,
OPL3_HW_OPL3, 1, &opl3)) < 0) {
dev_warn(card->dev,
"cannot initialize FM OPL3 at 0x%lx, skipping...\n",
fm_port[dev]);
legacy_ctrl &= ~YMFPCI_LEGACY_FMEN;
pci_write_config_word(pci, PCIR_DSXG_LEGACY, legacy_ctrl);
} else if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
snd_card_free(card);
dev_err(card->dev, "cannot create opl3 hwdep\n");
return err;
}
}
snd_ymfpci_create_gameport(chip, dev, legacy_ctrl, legacy_ctrl2);
if ((err = snd_card_register(card)) < 0) {
snd_card_free(card);
return err;
}
pci_set_drvdata(pci, card);
dev++;
return 0;
}
static void snd_card_ymfpci_remove(struct pci_dev *pci)
{
snd_card_free(pci_get_drvdata(pci));
}
static struct pci_driver ymfpci_driver = {
.name = KBUILD_MODNAME,
.id_table = snd_ymfpci_ids,
.probe = snd_card_ymfpci_probe,
.remove = snd_card_ymfpci_remove,
#ifdef CONFIG_PM_SLEEP
.driver = {
.pm = &snd_ymfpci_pm,
},
#endif
};
module_pci_driver(ymfpci_driver);
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