222 lines
5.0 KiB
C
222 lines
5.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PC-Speaker driver for Linux
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*
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* Copyright (C) 1997-2001 David Woodhouse
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* Copyright (C) 2001-2008 Stas Sergeev
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/pcm.h>
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#include <linux/input.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <linux/mm.h>
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#include "pcsp_input.h"
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#include "pcsp.h"
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MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
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MODULE_DESCRIPTION("PC-Speaker driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcspkr");
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static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */
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static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */
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static bool enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */
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static bool nopcm; /* Disable PCM capability of the driver */
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module_param(index, int, 0444);
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MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
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module_param(id, charp, 0444);
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MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
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module_param(enable, bool, 0444);
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MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
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module_param(nopcm, bool, 0444);
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MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
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struct snd_pcsp pcsp_chip;
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static int snd_pcsp_create(struct snd_card *card)
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{
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unsigned int resolution = hrtimer_resolution;
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int div, min_div, order;
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if (!nopcm) {
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if (resolution > PCSP_MAX_PERIOD_NS) {
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printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
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"(%unS)\n", resolution);
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printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
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"enabled.\n");
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printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
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nopcm = 1;
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}
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}
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if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
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min_div = MIN_DIV;
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else
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min_div = MAX_DIV;
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#if PCSP_DEBUG
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printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
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loops_per_jiffy, min_div, resolution);
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#endif
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div = MAX_DIV / min_div;
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order = fls(div) - 1;
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pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
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pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
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pcsp_chip.playback_ptr = 0;
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pcsp_chip.period_ptr = 0;
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atomic_set(&pcsp_chip.timer_active, 0);
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pcsp_chip.enable = 1;
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pcsp_chip.pcspkr = 1;
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spin_lock_init(&pcsp_chip.substream_lock);
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pcsp_chip.card = card;
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pcsp_chip.port = 0x61;
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pcsp_chip.irq = -1;
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pcsp_chip.dma = -1;
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card->private_data = &pcsp_chip;
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return 0;
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}
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static void pcsp_stop_beep(struct snd_pcsp *chip);
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static void alsa_card_pcsp_free(struct snd_card *card)
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{
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pcsp_stop_beep(card->private_data);
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}
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static int snd_card_pcsp_probe(int devnum, struct device *dev)
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{
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struct snd_card *card;
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int err;
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if (devnum != 0)
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return -EINVAL;
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hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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pcsp_chip.timer.function = pcsp_do_timer;
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err = snd_devm_card_new(dev, index, id, THIS_MODULE, 0, &card);
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if (err < 0)
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return err;
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err = snd_pcsp_create(card);
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if (err < 0)
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return err;
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if (!nopcm) {
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err = snd_pcsp_new_pcm(&pcsp_chip);
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if (err < 0)
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return err;
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}
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err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
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if (err < 0)
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return err;
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strcpy(card->driver, "PC-Speaker");
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strcpy(card->shortname, "pcsp");
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sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
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pcsp_chip.port);
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err = snd_card_register(card);
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if (err < 0)
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return err;
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card->private_free = alsa_card_pcsp_free;
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return 0;
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}
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static int alsa_card_pcsp_init(struct device *dev)
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{
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int err;
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err = snd_card_pcsp_probe(0, dev);
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if (err) {
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printk(KERN_ERR "PC-Speaker initialization failed.\n");
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return err;
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}
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/* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
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if (debug_pagealloc_enabled()) {
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printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
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"which may make the sound noisy.\n");
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}
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return 0;
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}
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static int pcsp_probe(struct platform_device *dev)
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{
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int err;
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err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
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if (err < 0)
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return err;
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err = alsa_card_pcsp_init(&dev->dev);
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if (err < 0)
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return err;
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platform_set_drvdata(dev, &pcsp_chip);
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return 0;
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}
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static void pcsp_stop_beep(struct snd_pcsp *chip)
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{
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pcsp_sync_stop(chip);
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pcspkr_stop_sound();
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}
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#ifdef CONFIG_PM_SLEEP
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static int pcsp_suspend(struct device *dev)
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{
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struct snd_pcsp *chip = dev_get_drvdata(dev);
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pcsp_stop_beep(chip);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
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#define PCSP_PM_OPS &pcsp_pm
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#else
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#define PCSP_PM_OPS NULL
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#endif /* CONFIG_PM_SLEEP */
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static void pcsp_shutdown(struct platform_device *dev)
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{
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struct snd_pcsp *chip = platform_get_drvdata(dev);
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pcsp_stop_beep(chip);
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}
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static struct platform_driver pcsp_platform_driver = {
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.driver = {
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.name = "pcspkr",
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.pm = PCSP_PM_OPS,
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},
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.probe = pcsp_probe,
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.shutdown = pcsp_shutdown,
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};
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static int __init pcsp_init(void)
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{
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if (!enable)
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return -ENODEV;
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return platform_driver_register(&pcsp_platform_driver);
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}
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static void __exit pcsp_exit(void)
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{
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platform_driver_unregister(&pcsp_platform_driver);
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}
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module_init(pcsp_init);
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module_exit(pcsp_exit);
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