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linux-7.2.3/sound/drivers/pcsp/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+snd-pcsp-y := pcsp.o pcsp_lib.o pcsp_mixer.o pcsp_input.o
+obj-$(CONFIG_SND_PCSP) += snd-pcsp.o

linux-7.2.3/sound/drivers/pcsp/pcsp.c

@@ -0,0 +1,216 @@
+// 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) {
+			dev_err(card->dev,
+				"PCSP: Timer resolution is not sufficient (%unS)\n",
+				resolution);
+			dev_err(card->dev,
+				"PCSP: Make sure you have HPET and ACPI enabled.\n");
+			dev_err(card->dev, "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
+	dev_dbg(card->dev, "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_setup(&pcsp_chip.timer, pcsp_do_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+
+	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;
+
+	strscpy(card->driver, "PC-Speaker");
+	strscpy(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) {
+		dev_err(dev, "PC-Speaker initialization failed.\n");
+		return err;
+	}
+
+	/* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
+	if (debug_pagealloc_enabled()) {
+		dev_warn(dev,
+			 "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();
+}
+
+static int pcsp_suspend(struct device *dev)
+{
+	struct snd_pcsp *chip = dev_get_drvdata(dev);
+	pcsp_stop_beep(chip);
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
+
+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,
+	},
+	.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);

linux-7.2.3/sound/drivers/pcsp/pcsp.h

@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PC-Speaker driver for Linux
+ *
+ * Copyright (C) 1993-1997  Michael Beck
+ * Copyright (C) 1997-2001  David Woodhouse
+ * Copyright (C) 2001-2008  Stas Sergeev
+ */
+
+#ifndef __PCSP_H__
+#define __PCSP_H__
+
+#include <linux/hrtimer.h>
+#include <linux/i8253.h>
+#include <linux/timex.h>
+
+#define PCSP_SOUND_VERSION 0x400	/* read 4.00 */
+#define PCSP_DEBUG 0
+
+/* default timer freq for PC-Speaker: 18643 Hz */
+#define DIV_18KHZ 64
+#define MAX_DIV DIV_18KHZ
+#define CALC_DIV(d) (MAX_DIV >> (d))
+#define CUR_DIV() CALC_DIV(chip->treble)
+#define PCSP_MAX_TREBLE 1
+
+/* unfortunately, with hrtimers 37KHz does not work very well :( */
+#define PCSP_DEFAULT_TREBLE 0
+#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
+
+/* wild guess */
+#define PCSP_MIN_LPJ 1000000
+#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
+#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
+#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
+#define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
+#define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
+#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
+#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
+#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
+#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
+#define PCSP_CALC_NS(div) ({ \
+	u64 __val = 1000000000ULL * (div); \
+	do_div(__val, PIT_TICK_RATE); \
+	__val; \
+})
+#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
+
+#define PCSP_MAX_PERIOD_SIZE	(64*1024)
+#define PCSP_MAX_PERIODS	512
+#define PCSP_BUFFER_SIZE	(128*1024)
+
+struct snd_pcsp {
+	struct snd_card *card;
+	struct snd_pcm *pcm;
+	struct input_dev *input_dev;
+	struct hrtimer timer;
+	unsigned short port, irq, dma;
+	spinlock_t substream_lock;
+	struct snd_pcm_substream *playback_substream;
+	unsigned int fmt_size;
+	unsigned int is_signed;
+	size_t playback_ptr;
+	size_t period_ptr;
+	atomic_t timer_active;
+	int thalf;
+	u64 ns_rem;
+	unsigned char val61;
+	int enable;
+	int max_treble;
+	int treble;
+	int pcspkr;
+};
+
+extern struct snd_pcsp pcsp_chip;
+
+extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
+extern void pcsp_sync_stop(struct snd_pcsp *chip);
+
+extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
+extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);
+
+#endif

linux-7.2.3/sound/drivers/pcsp/pcsp_input.c

@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  PC Speaker beeper driver for Linux
+ *
+ *  Copyright (c) 2002 Vojtech Pavlik
+ *  Copyright (c) 1992 Orest Zborowski
+ */
+
+
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/io.h>
+#include "pcsp.h"
+#include "pcsp_input.h"
+
+static void pcspkr_do_sound(unsigned int count)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&i8253_lock, flags);
+
+	if (count) {
+		/* set command for counter 2, 2 byte write */
+		outb_p(0xB6, 0x43);
+		/* select desired HZ */
+		outb_p(count & 0xff, 0x42);
+		outb((count >> 8) & 0xff, 0x42);
+		/* enable counter 2 */
+		outb_p(inb_p(0x61) | 3, 0x61);
+	} else {
+		/* disable counter 2 */
+		outb(inb_p(0x61) & 0xFC, 0x61);
+	}
+
+	raw_spin_unlock_irqrestore(&i8253_lock, flags);
+}
+
+void pcspkr_stop_sound(void)
+{
+	pcspkr_do_sound(0);
+}
+
+static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
+			      unsigned int code, int value)
+{
+	unsigned int count = 0;
+
+	if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
+		return 0;
+
+	switch (type) {
+	case EV_SND:
+		switch (code) {
+		case SND_BELL:
+			if (value)
+				value = 1000;
+			break;
+		case SND_TONE:
+			break;
+		default:
+			return -1;
+		}
+		break;
+
+	default:
+		return -1;
+	}
+
+	if (value > 20 && value < 32767)
+		count = PIT_TICK_RATE / value;
+
+	pcspkr_do_sound(count);
+
+	return 0;
+}
+
+int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
+{
+	int err;
+
+	struct input_dev *input_dev = devm_input_allocate_device(dev);
+	if (!input_dev)
+		return -ENOMEM;
+
+	input_dev->name = "PC Speaker";
+	input_dev->phys = "isa0061/input0";
+	input_dev->id.bustype = BUS_ISA;
+	input_dev->id.vendor = 0x001f;
+	input_dev->id.product = 0x0001;
+	input_dev->id.version = 0x0100;
+	input_dev->dev.parent = dev;
+
+	input_dev->evbit[0] = BIT(EV_SND);
+	input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
+	input_dev->event = pcspkr_input_event;
+
+	err = input_register_device(input_dev);
+	if (err)
+		return err;
+
+	*rdev = input_dev;
+	return 0;
+}

linux-7.2.3/sound/drivers/pcsp/pcsp_input.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PC-Speaker driver for Linux
+ *
+ * Copyright (C) 2001-2008  Stas Sergeev
+ */
+
+#ifndef __PCSP_INPUT_H__
+#define __PCSP_INPUT_H__
+
+int pcspkr_input_init(struct input_dev **rdev, struct device *dev);
+void pcspkr_stop_sound(void);
+
+#endif

linux-7.2.3/sound/drivers/pcsp/pcsp_lib.c

@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PC-Speaker driver for Linux
+ *
+ * Copyright (C) 1993-1997  Michael Beck
+ * Copyright (C) 1997-2001  David Woodhouse
+ * Copyright (C) 2001-2008  Stas Sergeev
+ */
+
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/moduleparam.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include "pcsp.h"
+
+static bool nforce_wa;
+module_param(nforce_wa, bool, 0444);
+MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
+		"(expect bad sound)");
+
+#define DMIX_WANTS_S16	1
+
+/*
+ * Call snd_pcm_period_elapsed in a work
+ * This avoids spinlock messes and long-running irq contexts
+ */
+static void pcsp_call_pcm_elapsed(struct work_struct *work)
+{
+	if (atomic_read(&pcsp_chip.timer_active)) {
+		struct snd_pcm_substream *substream;
+		substream = pcsp_chip.playback_substream;
+		if (substream)
+			snd_pcm_period_elapsed(substream);
+	}
+}
+
+static DECLARE_WORK(pcsp_pcm_work, pcsp_call_pcm_elapsed);
+
+/* write the port and returns the next expire time in ns;
+ * called at the trigger-start and in hrtimer callback
+ */
+static u64 pcsp_timer_update(struct snd_pcsp *chip)
+{
+	unsigned char timer_cnt, val;
+	u64 ns;
+	struct snd_pcm_substream *substream;
+	struct snd_pcm_runtime *runtime;
+	unsigned long flags;
+
+	if (chip->thalf) {
+		outb(chip->val61, 0x61);
+		chip->thalf = 0;
+		return chip->ns_rem;
+	}
+
+	substream = chip->playback_substream;
+	if (!substream)
+		return 0;
+
+	runtime = substream->runtime;
+	/* assume it is mono! */
+	val = runtime->dma_area[chip->playback_ptr + chip->fmt_size - 1];
+	if (chip->is_signed)
+		val ^= 0x80;
+	timer_cnt = val * CUR_DIV() / 256;
+
+	if (timer_cnt && chip->enable) {
+		raw_spin_lock_irqsave(&i8253_lock, flags);
+		if (!nforce_wa) {
+			outb_p(chip->val61, 0x61);
+			outb_p(timer_cnt, 0x42);
+			outb(chip->val61 ^ 1, 0x61);
+		} else {
+			outb(chip->val61 ^ 2, 0x61);
+			chip->thalf = 1;
+		}
+		raw_spin_unlock_irqrestore(&i8253_lock, flags);
+	}
+
+	chip->ns_rem = PCSP_PERIOD_NS();
+	ns = (chip->thalf ? PCSP_CALC_NS(timer_cnt) : chip->ns_rem);
+	chip->ns_rem -= ns;
+	return ns;
+}
+
+static void pcsp_pointer_update(struct snd_pcsp *chip)
+{
+	struct snd_pcm_substream *substream;
+	size_t period_bytes, buffer_bytes;
+	int periods_elapsed;
+	unsigned long flags;
+
+	/* update the playback position */
+	substream = chip->playback_substream;
+	if (!substream)
+		return;
+
+	period_bytes = snd_pcm_lib_period_bytes(substream);
+	buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
+
+	spin_lock_irqsave(&chip->substream_lock, flags);
+	chip->playback_ptr += PCSP_INDEX_INC() * chip->fmt_size;
+	periods_elapsed = chip->playback_ptr - chip->period_ptr;
+	if (periods_elapsed < 0) {
+#if PCSP_DEBUG
+		dev_dbg(chip->card->dev,
+			"PCSP: buffer_bytes mod period_bytes != 0 ? (%zi %zi %zi)\n",
+			chip->playback_ptr, period_bytes, buffer_bytes);
+#endif
+		periods_elapsed += buffer_bytes;
+	}
+	periods_elapsed /= period_bytes;
+	/* wrap the pointer _before_ calling snd_pcm_period_elapsed(),
+	 * or ALSA will BUG on us. */
+	chip->playback_ptr %= buffer_bytes;
+
+	if (periods_elapsed) {
+		chip->period_ptr += periods_elapsed * period_bytes;
+		chip->period_ptr %= buffer_bytes;
+		queue_work(system_highpri_wq, &pcsp_pcm_work);
+	}
+	spin_unlock_irqrestore(&chip->substream_lock, flags);
+}
+
+enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
+{
+	struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
+	int pointer_update;
+	u64 ns;
+
+	if (!atomic_read(&chip->timer_active) || !chip->playback_substream)
+		return HRTIMER_NORESTART;
+
+	pointer_update = !chip->thalf;
+	ns = pcsp_timer_update(chip);
+	if (!ns) {
+		dev_warn(chip->card->dev, "PCSP: unexpected stop\n");
+		return HRTIMER_NORESTART;
+	}
+
+	if (pointer_update)
+		pcsp_pointer_update(chip);
+
+	hrtimer_forward_now(handle, ns_to_ktime(ns));
+
+	return HRTIMER_RESTART;
+}
+
+static int pcsp_start_playing(struct snd_pcsp *chip)
+{
+#if PCSP_DEBUG
+	dev_dbg(chip->card->dev, "PCSP: start_playing called\n");
+#endif
+	if (atomic_read(&chip->timer_active)) {
+		dev_err(chip->card->dev, "PCSP: Timer already active\n");
+		return -EIO;
+	}
+
+	raw_spin_lock(&i8253_lock);
+	chip->val61 = inb(0x61) | 0x03;
+	outb_p(0x92, 0x43);	/* binary, mode 1, LSB only, ch 2 */
+	raw_spin_unlock(&i8253_lock);
+	atomic_set(&chip->timer_active, 1);
+	chip->thalf = 0;
+
+	hrtimer_start(&pcsp_chip.timer, 0, HRTIMER_MODE_REL);
+	return 0;
+}
+
+static void pcsp_stop_playing(struct snd_pcsp *chip)
+{
+#if PCSP_DEBUG
+	dev_dbg(chip->card->dev, "PCSP: stop_playing called\n");
+#endif
+	if (!atomic_read(&chip->timer_active))
+		return;
+
+	atomic_set(&chip->timer_active, 0);
+	raw_spin_lock(&i8253_lock);
+	/* restore the timer */
+	outb_p(0xb6, 0x43);	/* binary, mode 3, LSB/MSB, ch 2 */
+	outb(chip->val61 & 0xFC, 0x61);
+	raw_spin_unlock(&i8253_lock);
+}
+
+/*
+ * Force to stop and sync the stream
+ */
+void pcsp_sync_stop(struct snd_pcsp *chip)
+{
+	local_irq_disable();
+	pcsp_stop_playing(chip);
+	local_irq_enable();
+	hrtimer_cancel(&chip->timer);
+	cancel_work_sync(&pcsp_pcm_work);
+}
+
+static int snd_pcsp_playback_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+#if PCSP_DEBUG
+	dev_dbg(chip->card->dev, "PCSP: close called\n");
+#endif
+	pcsp_sync_stop(chip);
+	chip->playback_substream = NULL;
+	return 0;
+}
+
+static int snd_pcsp_playback_hw_params(struct snd_pcm_substream *substream,
+				       struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+	pcsp_sync_stop(chip);
+	return 0;
+}
+
+static int snd_pcsp_playback_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+#if PCSP_DEBUG
+	dev_dbg(chip->card->dev, "PCSP: hw_free called\n");
+#endif
+	pcsp_sync_stop(chip);
+	return 0;
+}
+
+static int snd_pcsp_playback_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+	pcsp_sync_stop(chip);
+	chip->playback_ptr = 0;
+	chip->period_ptr = 0;
+	chip->fmt_size =
+		snd_pcm_format_physical_width(substream->runtime->format) >> 3;
+	chip->is_signed = snd_pcm_format_signed(substream->runtime->format);
+#if PCSP_DEBUG
+	dev_dbg(chip->card->dev, "PCSP: prepare called, size=%zi psize=%zi f=%zi f1=%i fsize=%i\n",
+		snd_pcm_lib_buffer_bytes(substream),
+		snd_pcm_lib_period_bytes(substream),
+		snd_pcm_lib_buffer_bytes(substream) /
+		snd_pcm_lib_period_bytes(substream),
+		substream->runtime->periods,
+		chip->fmt_size);
+#endif
+	return 0;
+}
+
+static int snd_pcsp_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+#if PCSP_DEBUG
+	dev_dbg(chip->card->dev, "PCSP: trigger called\n");
+#endif
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		return pcsp_start_playing(chip);
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		pcsp_stop_playing(chip);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static snd_pcm_uframes_t snd_pcsp_playback_pointer(struct snd_pcm_substream
+						   *substream)
+{
+	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+	unsigned int pos;
+	spin_lock(&chip->substream_lock);
+	pos = chip->playback_ptr;
+	spin_unlock(&chip->substream_lock);
+	return bytes_to_frames(substream->runtime, pos);
+}
+
+static const struct snd_pcm_hardware snd_pcsp_playback = {
+	.info = (SNDRV_PCM_INFO_INTERLEAVED |
+		 SNDRV_PCM_INFO_HALF_DUPLEX |
+		 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
+	.formats = (SNDRV_PCM_FMTBIT_U8
+#if DMIX_WANTS_S16
+		    | SNDRV_PCM_FMTBIT_S16_LE
+#endif
+	    ),
+	.rates = SNDRV_PCM_RATE_KNOT,
+	.rate_min = PCSP_DEFAULT_SRATE,
+	.rate_max = PCSP_DEFAULT_SRATE,
+	.channels_min = 1,
+	.channels_max = 1,
+	.buffer_bytes_max = PCSP_BUFFER_SIZE,
+	.period_bytes_min = 64,
+	.period_bytes_max = PCSP_MAX_PERIOD_SIZE,
+	.periods_min = 2,
+	.periods_max = PCSP_MAX_PERIODS,
+	.fifo_size = 0,
+};
+
+static int snd_pcsp_playback_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+#if PCSP_DEBUG
+	dev_dbg(chip->card->dev, "PCSP: open called\n");
+#endif
+	if (atomic_read(&chip->timer_active)) {
+		dev_err(chip->card->dev, "PCSP: still active!!\n");
+		return -EBUSY;
+	}
+	runtime->hw = snd_pcsp_playback;
+	chip->playback_substream = substream;
+	return 0;
+}
+
+static const struct snd_pcm_ops snd_pcsp_playback_ops = {
+	.open = snd_pcsp_playback_open,
+	.close = snd_pcsp_playback_close,
+	.hw_params = snd_pcsp_playback_hw_params,
+	.hw_free = snd_pcsp_playback_hw_free,
+	.prepare = snd_pcsp_playback_prepare,
+	.trigger = snd_pcsp_trigger,
+	.pointer = snd_pcsp_playback_pointer,
+};
+
+int snd_pcsp_new_pcm(struct snd_pcsp *chip)
+{
+	int err;
+
+	err = snd_pcm_new(chip->card, "pcspeaker", 0, 1, 0, &chip->pcm);
+	if (err < 0)
+		return err;
+
+	snd_pcm_set_ops(chip->pcm, SNDRV_PCM_STREAM_PLAYBACK,
+			&snd_pcsp_playback_ops);
+
+	chip->pcm->private_data = chip;
+	chip->pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
+	strscpy(chip->pcm->name, "pcsp");
+
+	snd_pcm_set_managed_buffer_all(chip->pcm,
+				       SNDRV_DMA_TYPE_CONTINUOUS,
+				       NULL,
+				       PCSP_BUFFER_SIZE,
+				       PCSP_BUFFER_SIZE);
+
+	return 0;
+}

linux-7.2.3/sound/drivers/pcsp/pcsp_mixer.c

@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PC-Speaker driver for Linux
+ *
+ * Mixer implementation.
+ * Copyright (C) 2001-2008  Stas Sergeev
+ */
+
+#include <sound/core.h>
+#include <sound/control.h>
+#include "pcsp.h"
+
+
+static int pcsp_enable_info(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	return 0;
+}
+
+static int pcsp_enable_get(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
+	ucontrol->value.integer.value[0] = chip->enable;
+	return 0;
+}
+
+static int pcsp_enable_put(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
+	int changed = 0;
+	int enab = ucontrol->value.integer.value[0];
+	if (enab != chip->enable) {
+		chip->enable = enab;
+		changed = 1;
+	}
+	return changed;
+}
+
+static int pcsp_treble_info(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_info *uinfo)
+{
+	struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = chip->max_treble + 1;
+	if (uinfo->value.enumerated.item > chip->max_treble)
+		uinfo->value.enumerated.item = chip->max_treble;
+	sprintf(uinfo->value.enumerated.name, "%lu",
+		(unsigned long)PCSP_CALC_RATE(uinfo->value.enumerated.item));
+	return 0;
+}
+
+static int pcsp_treble_get(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
+	ucontrol->value.enumerated.item[0] = chip->treble;
+	return 0;
+}
+
+static int pcsp_treble_put(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
+	int changed = 0;
+	int treble = ucontrol->value.enumerated.item[0];
+	if (treble != chip->treble) {
+		chip->treble = treble;
+#if PCSP_DEBUG
+		dev_dbg(chip->card->dev, "PCSP: rate set to %li\n", PCSP_RATE());
+#endif
+		changed = 1;
+	}
+	return changed;
+}
+
+static int pcsp_pcspkr_info(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	return 0;
+}
+
+static int pcsp_pcspkr_get(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
+	ucontrol->value.integer.value[0] = chip->pcspkr;
+	return 0;
+}
+
+static int pcsp_pcspkr_put(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
+	int changed = 0;
+	int spkr = ucontrol->value.integer.value[0];
+	if (spkr != chip->pcspkr) {
+		chip->pcspkr = spkr;
+		changed = 1;
+	}
+	return changed;
+}
+
+#define PCSP_MIXER_CONTROL(ctl_type, ctl_name) \
+{ \
+	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER, \
+	.name =		ctl_name, \
+	.info =		pcsp_##ctl_type##_info, \
+	.get =		pcsp_##ctl_type##_get, \
+	.put =		pcsp_##ctl_type##_put, \
+}
+
+static const struct snd_kcontrol_new snd_pcsp_controls_pcm[] = {
+	PCSP_MIXER_CONTROL(enable, "Master Playback Switch"),
+	PCSP_MIXER_CONTROL(treble, "BaseFRQ Playback Volume"),
+};
+
+static const struct snd_kcontrol_new snd_pcsp_controls_spkr[] = {
+	PCSP_MIXER_CONTROL(pcspkr, "Beep Playback Switch"),
+};
+
+static int snd_pcsp_ctls_add(struct snd_pcsp *chip,
+			     const struct snd_kcontrol_new *ctls, int num)
+{
+	int i, err;
+	struct snd_card *card = chip->card;
+	for (i = 0; i < num; i++) {
+		err = snd_ctl_add(card, snd_ctl_new1(ctls + i, chip));
+		if (err < 0)
+			return err;
+	}
+	return 0;
+}
+
+int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm)
+{
+	int err;
+	struct snd_card *card = chip->card;
+
+	if (!nopcm) {
+		err = snd_pcsp_ctls_add(chip, snd_pcsp_controls_pcm,
+			ARRAY_SIZE(snd_pcsp_controls_pcm));
+		if (err < 0)
+			return err;
+	}
+	err = snd_pcsp_ctls_add(chip, snd_pcsp_controls_spkr,
+		ARRAY_SIZE(snd_pcsp_controls_spkr));
+	if (err < 0)
+		return err;
+
+	strscpy(card->mixername, "PC-Speaker");
+
+	return 0;
+}