--- /dev/null
+/*
+ * 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 "pcsp_input.h"
+#include "pcsp.h"
+
+MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
+MODULE_DESCRIPTION("PC-Speaker driver");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
+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)
+{
+ static struct snd_device_ops ops = { };
+ struct timespec tp;
+ int err;
+ int div, min_div, order;
+
+ hrtimer_get_res(CLOCK_MONOTONIC, &tp);
+
+ if (!nopcm) {
+ if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
+ printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
+ "(%linS)\n", tp.tv_nsec);
+ 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 && tp.tv_nsec <= 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=%li\n",
+ loops_per_jiffy, min_div, tp.tv_nsec);
+#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;
+
+ /* Register device */
+ err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+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_card_new(dev, index, id, THIS_MODULE, 0, &card);
+ if (err < 0)
+ return err;
+
+ err = snd_pcsp_create(card);
+ if (err < 0) {
+ snd_card_free(card);
+ return err;
+ }
+ if (!nopcm) {
+ err = snd_pcsp_new_pcm(&pcsp_chip);
+ if (err < 0) {
+ snd_card_free(card);
+ return err;
+ }
+ }
+ err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
+ if (err < 0) {
+ snd_card_free(card);
+ 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) {
+ snd_card_free(card);
+ return err;
+ }
+
+ 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;
+ }
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
+ printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
+ "which may make the sound noisy.\n");
+#endif
+
+ return 0;
+}
+
+static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
+{
+ snd_card_free(chip->card);
+}
+
+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) {
+ pcspkr_input_remove(pcsp_chip.input_dev);
+ return err;
+ }
+
+ platform_set_drvdata(dev, &pcsp_chip);
+ return 0;
+}
+
+static int pcsp_remove(struct platform_device *dev)
+{
+ struct snd_pcsp *chip = platform_get_drvdata(dev);
+ pcspkr_input_remove(chip->input_dev);
+ alsa_card_pcsp_exit(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);
+ snd_pcm_suspend_all(chip->pcm);
+ 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,
+ .remove = pcsp_remove,
+ .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);
Code Review / kvmfornfv.git / blobdiff