[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>

1 files changed, 241 insertions, 0 deletions

diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
new file mode 100644
index 000000000000..34477286b394
--- /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);