![David Howells](/assets/img/avatar_default.png)
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
255 lines
6.8 KiB
C
255 lines
6.8 KiB
C
/*
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* Driver for SoundBlaster 1.0/2.0/Pro soundcards and compatible
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/isa.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/sb.h>
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#include <sound/opl3.h>
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#include <sound/initval.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("Sound Blaster 1.0/2.0/Pro");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("{{Creative Labs,SB 1.0/SB 2.0/SB Pro}}");
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
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static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x220,0x240,0x260 */
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static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 5,7,9,10 */
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static int dma8[SNDRV_CARDS] = SNDRV_DEFAULT_DMA; /* 1,3 */
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for Sound Blaster soundcard.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for Sound Blaster soundcard.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable Sound Blaster soundcard.");
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module_param_hw_array(port, long, ioport, NULL, 0444);
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MODULE_PARM_DESC(port, "Port # for SB8 driver.");
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module_param_hw_array(irq, int, irq, NULL, 0444);
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MODULE_PARM_DESC(irq, "IRQ # for SB8 driver.");
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module_param_hw_array(dma8, int, dma, NULL, 0444);
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MODULE_PARM_DESC(dma8, "8-bit DMA # for SB8 driver.");
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struct snd_sb8 {
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struct resource *fm_res; /* used to block FM i/o region for legacy cards */
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struct snd_sb *chip;
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};
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static irqreturn_t snd_sb8_interrupt(int irq, void *dev_id)
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{
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struct snd_sb *chip = dev_id;
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if (chip->open & SB_OPEN_PCM) {
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return snd_sb8dsp_interrupt(chip);
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} else {
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return snd_sb8dsp_midi_interrupt(chip);
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}
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}
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static void snd_sb8_free(struct snd_card *card)
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{
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struct snd_sb8 *acard = card->private_data;
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if (acard == NULL)
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return;
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release_and_free_resource(acard->fm_res);
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}
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static int snd_sb8_match(struct device *pdev, unsigned int dev)
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{
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if (!enable[dev])
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return 0;
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if (irq[dev] == SNDRV_AUTO_IRQ) {
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dev_err(pdev, "please specify irq\n");
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return 0;
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}
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if (dma8[dev] == SNDRV_AUTO_DMA) {
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dev_err(pdev, "please specify dma8\n");
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return 0;
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}
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return 1;
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}
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static int snd_sb8_probe(struct device *pdev, unsigned int dev)
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{
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struct snd_sb *chip;
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struct snd_card *card;
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struct snd_sb8 *acard;
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struct snd_opl3 *opl3;
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int err;
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err = snd_card_new(pdev, index[dev], id[dev], THIS_MODULE,
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sizeof(struct snd_sb8), &card);
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if (err < 0)
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return err;
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acard = card->private_data;
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card->private_free = snd_sb8_free;
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/* block the 0x388 port to avoid PnP conflicts */
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acard->fm_res = request_region(0x388, 4, "SoundBlaster FM");
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if (port[dev] != SNDRV_AUTO_PORT) {
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if ((err = snd_sbdsp_create(card, port[dev], irq[dev],
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snd_sb8_interrupt,
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dma8[dev],
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-1,
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SB_HW_AUTO,
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&chip)) < 0)
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goto _err;
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} else {
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/* auto-probe legacy ports */
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static unsigned long possible_ports[] = {
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0x220, 0x240, 0x260,
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};
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int i;
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for (i = 0; i < ARRAY_SIZE(possible_ports); i++) {
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err = snd_sbdsp_create(card, possible_ports[i],
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irq[dev],
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snd_sb8_interrupt,
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dma8[dev],
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-1,
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SB_HW_AUTO,
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&chip);
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if (err >= 0) {
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port[dev] = possible_ports[i];
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break;
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}
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}
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if (i >= ARRAY_SIZE(possible_ports)) {
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err = -EINVAL;
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goto _err;
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}
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}
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acard->chip = chip;
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if (chip->hardware >= SB_HW_16) {
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if (chip->hardware == SB_HW_ALS100)
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snd_printk(KERN_WARNING "ALS100 chip detected at 0x%lx, try snd-als100 module\n",
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port[dev]);
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else
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snd_printk(KERN_WARNING "SB 16 chip detected at 0x%lx, try snd-sb16 module\n",
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port[dev]);
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err = -ENODEV;
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goto _err;
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}
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if ((err = snd_sb8dsp_pcm(chip, 0)) < 0)
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goto _err;
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if ((err = snd_sbmixer_new(chip)) < 0)
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goto _err;
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if (chip->hardware == SB_HW_10 || chip->hardware == SB_HW_20) {
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if ((err = snd_opl3_create(card, chip->port + 8, 0,
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OPL3_HW_AUTO, 1,
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&opl3)) < 0) {
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snd_printk(KERN_WARNING "sb8: no OPL device at 0x%lx\n", chip->port + 8);
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}
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} else {
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if ((err = snd_opl3_create(card, chip->port, chip->port + 2,
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OPL3_HW_AUTO, 1,
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&opl3)) < 0) {
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snd_printk(KERN_WARNING "sb8: no OPL device at 0x%lx-0x%lx\n",
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chip->port, chip->port + 2);
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}
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}
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if (err >= 0) {
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if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0)
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goto _err;
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}
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if ((err = snd_sb8dsp_midi(chip, 0)) < 0)
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goto _err;
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strcpy(card->driver, chip->hardware == SB_HW_PRO ? "SB Pro" : "SB8");
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strcpy(card->shortname, chip->name);
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sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d",
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chip->name,
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chip->port,
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irq[dev], dma8[dev]);
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if ((err = snd_card_register(card)) < 0)
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goto _err;
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dev_set_drvdata(pdev, card);
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return 0;
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_err:
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snd_card_free(card);
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return err;
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}
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static int snd_sb8_remove(struct device *pdev, unsigned int dev)
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{
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snd_card_free(dev_get_drvdata(pdev));
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return 0;
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}
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#ifdef CONFIG_PM
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static int snd_sb8_suspend(struct device *dev, unsigned int n,
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pm_message_t state)
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{
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struct snd_card *card = dev_get_drvdata(dev);
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struct snd_sb8 *acard = card->private_data;
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struct snd_sb *chip = acard->chip;
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snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
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snd_pcm_suspend_all(chip->pcm);
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snd_sbmixer_suspend(chip);
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return 0;
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}
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static int snd_sb8_resume(struct device *dev, unsigned int n)
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{
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struct snd_card *card = dev_get_drvdata(dev);
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struct snd_sb8 *acard = card->private_data;
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struct snd_sb *chip = acard->chip;
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snd_sbdsp_reset(chip);
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snd_sbmixer_resume(chip);
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snd_power_change_state(card, SNDRV_CTL_POWER_D0);
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return 0;
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}
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#endif
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#define DEV_NAME "sb8"
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static struct isa_driver snd_sb8_driver = {
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.match = snd_sb8_match,
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.probe = snd_sb8_probe,
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.remove = snd_sb8_remove,
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#ifdef CONFIG_PM
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.suspend = snd_sb8_suspend,
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.resume = snd_sb8_resume,
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#endif
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.driver = {
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.name = DEV_NAME
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},
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};
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module_isa_driver(snd_sb8_driver, SNDRV_CARDS);
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