[ALSA] Add PC-speaker sound driver
Added PC-speaker sound driver (snd-pcsp).
Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
new file mode 100644
index 0000000..3447728
--- /dev/null
+++ b/sound/drivers/pcsp/pcsp.c
@@ -0,0 +1,241 @@
+/*
+ * PC-Speaker driver for Linux
+ *
+ * Copyright (C) 1997-2001 David Woodhouse
+ * Copyright (C) 2001-2008 Stas Sergeev
+ */
+
+#include <linux/init.h>
+#include <linux/moduleparam.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 <asm/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 int enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */
+
+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, "dummy");
+
+struct snd_pcsp pcsp_chip;
+
+static int __devinit 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 (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");
+ return -EIO;
+ }
+
+ 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("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 __devinit 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.cb_mode = HRTIMER_CB_IRQSAFE;
+ pcsp_chip.timer.function = pcsp_do_timer;
+
+ card = snd_card_new(index, id, THIS_MODULE, 0);
+ if (!card)
+ return -ENOMEM;
+
+ err = snd_pcsp_create(card);
+ if (err < 0) {
+ snd_card_free(card);
+ return err;
+ }
+ err = snd_pcsp_new_pcm(&pcsp_chip);
+ if (err < 0) {
+ snd_card_free(card);
+ return err;
+ }
+ err = snd_pcsp_new_mixer(&pcsp_chip);
+ if (err < 0) {
+ snd_card_free(card);
+ return err;
+ }
+
+ snd_card_set_dev(pcsp_chip.card, dev);
+
+ 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 __devinit alsa_card_pcsp_init(struct device *dev)
+{
+ int devnum = 0, cards = 0;
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
+ printk(KERN_WARNING
+ "PCSP: Warning, CONFIG_DEBUG_PAGEALLOC is enabled!\n"
+ "You have to disable it if you want to use the PC-Speaker "
+ "driver.\n"
+ "Unless it is disabled, enjoy the horrible, distorted "
+ "and crackling noise.\n");
+#endif
+
+ if (enable) {
+ if (snd_card_pcsp_probe(devnum, dev) >= 0)
+ cards++;
+ if (!cards) {
+ printk(KERN_ERR "PC-Speaker initialization failed.\n");
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
+{
+ snd_card_free(chip->card);
+}
+
+static int __devinit 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 __devexit pcsp_remove(struct platform_device *dev)
+{
+ struct snd_pcsp *chip = platform_get_drvdata(dev);
+ alsa_card_pcsp_exit(chip);
+ pcspkr_input_remove(chip->input_dev);
+ platform_set_drvdata(dev, NULL);
+ return 0;
+}
+
+static void pcsp_stop_beep(struct snd_pcsp *chip)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&chip->substream_lock, flags);
+ if (!chip->playback_substream)
+ pcspkr_stop_sound();
+ spin_unlock_irqrestore(&chip->substream_lock, flags);
+}
+
+static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct snd_pcsp *chip = platform_get_drvdata(dev);
+ pcsp_stop_beep(chip);
+ snd_pcm_suspend_all(chip->pcm);
+ return 0;
+}
+
+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",
+ .owner = THIS_MODULE,
+ },
+ .probe = pcsp_probe,
+ .remove = __devexit_p(pcsp_remove),
+ .suspend = pcsp_suspend,
+ .shutdown = pcsp_shutdown,
+};
+
+static int __init pcsp_init(void)
+{
+ 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);