diff options
Diffstat (limited to 'sound/drivers/pcsp/pcsp.c')
| -rw-r--r-- | sound/drivers/pcsp/pcsp.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c new file mode 100644 index 000000000..c7be1c395 --- /dev/null +++ b/sound/drivers/pcsp/pcsp.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PC-Speaker driver for Linux + * + * Copyright (C) 1997-2001 David Woodhouse + * Copyright (C) 2001-2008 Stas Sergeev + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <linux/input.h> +#include <linux/delay.h> +#include <linux/bitops.h> +#include <linux/mm.h> +#include "pcsp_input.h" +#include "pcsp.h" + +MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>"); +MODULE_DESCRIPTION("PC-Speaker driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:pcspkr"); + +static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */ +static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */ +static bool enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */ +static bool nopcm; /* Disable PCM capability of the driver */ + +module_param(index, int, 0444); +MODULE_PARM_DESC(index, "Index value for pcsp soundcard."); +module_param(id, charp, 0444); +MODULE_PARM_DESC(id, "ID string for pcsp soundcard."); +module_param(enable, bool, 0444); +MODULE_PARM_DESC(enable, "Enable PC-Speaker sound."); +module_param(nopcm, bool, 0444); +MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain."); + +struct snd_pcsp pcsp_chip; + +static int snd_pcsp_create(struct snd_card *card) +{ + unsigned int resolution = hrtimer_resolution; + int div, min_div, order; + + if (!nopcm) { + if (resolution > PCSP_MAX_PERIOD_NS) { + printk(KERN_ERR "PCSP: Timer resolution is not sufficient " + "(%unS)\n", resolution); + printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI " + "enabled.\n"); + printk(KERN_ERR "PCSP: Turned into nopcm mode.\n"); + nopcm = 1; + } + } + + if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS) + min_div = MIN_DIV; + else + min_div = MAX_DIV; +#if PCSP_DEBUG + printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n", + loops_per_jiffy, min_div, resolution); +#endif + + div = MAX_DIV / min_div; + order = fls(div) - 1; + + pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE); + pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE); + pcsp_chip.playback_ptr = 0; + pcsp_chip.period_ptr = 0; + atomic_set(&pcsp_chip.timer_active, 0); + pcsp_chip.enable = 1; + pcsp_chip.pcspkr = 1; + + spin_lock_init(&pcsp_chip.substream_lock); + + pcsp_chip.card = card; + pcsp_chip.port = 0x61; + pcsp_chip.irq = -1; + pcsp_chip.dma = -1; + card->private_data = &pcsp_chip; + + return 0; +} + +static void pcsp_stop_beep(struct snd_pcsp *chip); + +static void alsa_card_pcsp_free(struct snd_card *card) +{ + pcsp_stop_beep(card->private_data); +} + +static int snd_card_pcsp_probe(int devnum, struct device *dev) +{ + struct snd_card *card; + int err; + + if (devnum != 0) + return -EINVAL; + + hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + pcsp_chip.timer.function = pcsp_do_timer; + + err = snd_devm_card_new(dev, index, id, THIS_MODULE, 0, &card); + if (err < 0) + return err; + + err = snd_pcsp_create(card); + if (err < 0) + return err; + + if (!nopcm) { + err = snd_pcsp_new_pcm(&pcsp_chip); + if (err < 0) + return err; + } + err = snd_pcsp_new_mixer(&pcsp_chip, nopcm); + if (err < 0) + return err; + + strcpy(card->driver, "PC-Speaker"); + strcpy(card->shortname, "pcsp"); + sprintf(card->longname, "Internal PC-Speaker at port 0x%x", + pcsp_chip.port); + + err = snd_card_register(card); + if (err < 0) + return err; + card->private_free = alsa_card_pcsp_free; + + return 0; +} + +static int alsa_card_pcsp_init(struct device *dev) +{ + int err; + + err = snd_card_pcsp_probe(0, dev); + if (err) { + printk(KERN_ERR "PC-Speaker initialization failed.\n"); + return err; + } + + /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */ + if (debug_pagealloc_enabled()) { + printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, " + "which may make the sound noisy.\n"); + } + + return 0; +} + +static int pcsp_probe(struct platform_device *dev) +{ + int err; + + err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev); + if (err < 0) + return err; + + err = alsa_card_pcsp_init(&dev->dev); + if (err < 0) + return err; + + platform_set_drvdata(dev, &pcsp_chip); + return 0; +} + +static void pcsp_stop_beep(struct snd_pcsp *chip) +{ + pcsp_sync_stop(chip); + pcspkr_stop_sound(); +} + +#ifdef CONFIG_PM_SLEEP +static int pcsp_suspend(struct device *dev) +{ + struct snd_pcsp *chip = dev_get_drvdata(dev); + pcsp_stop_beep(chip); + return 0; +} + +static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL); +#define PCSP_PM_OPS &pcsp_pm +#else +#define PCSP_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + +static void pcsp_shutdown(struct platform_device *dev) +{ + struct snd_pcsp *chip = platform_get_drvdata(dev); + pcsp_stop_beep(chip); +} + +static struct platform_driver pcsp_platform_driver = { + .driver = { + .name = "pcspkr", + .pm = PCSP_PM_OPS, + }, + .probe = pcsp_probe, + .shutdown = pcsp_shutdown, +}; + +static int __init pcsp_init(void) +{ + if (!enable) + return -ENODEV; + return platform_driver_register(&pcsp_platform_driver); +} + +static void __exit pcsp_exit(void) +{ + platform_driver_unregister(&pcsp_platform_driver); +} + +module_init(pcsp_init); +module_exit(pcsp_exit); |