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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * PC-Speaker driver for Linux4 *5 * Copyright (C) 1997-2001 David Woodhouse6 * Copyright (C) 2001-2008 Stas Sergeev7 */8 9#include <linux/init.h>10#include <linux/module.h>11#include <linux/platform_device.h>12#include <sound/core.h>13#include <sound/initval.h>14#include <sound/pcm.h>15#include <linux/input.h>16#include <linux/delay.h>17#include <linux/bitops.h>18#include <linux/mm.h>19#include "pcsp_input.h"20#include "pcsp.h"21 22MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");23MODULE_DESCRIPTION("PC-Speaker driver");24MODULE_LICENSE("GPL");25MODULE_ALIAS("platform:pcspkr");26 27static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */28static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */29static bool enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */30static bool nopcm; /* Disable PCM capability of the driver */31 32module_param(index, int, 0444);33MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");34module_param(id, charp, 0444);35MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");36module_param(enable, bool, 0444);37MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");38module_param(nopcm, bool, 0444);39MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");40 41struct snd_pcsp pcsp_chip;42 43static int snd_pcsp_create(struct snd_card *card)44{45 unsigned int resolution = hrtimer_resolution;46 int div, min_div, order;47 48 if (!nopcm) {49 if (resolution > PCSP_MAX_PERIOD_NS) {50 dev_err(card->dev,51 "PCSP: Timer resolution is not sufficient (%unS)\n",52 resolution);53 dev_err(card->dev,54 "PCSP: Make sure you have HPET and ACPI enabled.\n");55 dev_err(card->dev, "PCSP: Turned into nopcm mode.\n");56 nopcm = 1;57 }58 }59 60 if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)61 min_div = MIN_DIV;62 else63 min_div = MAX_DIV;64#if PCSP_DEBUG65 dev_dbg(card->dev, "PCSP: lpj=%li, min_div=%i, res=%u\n",66 loops_per_jiffy, min_div, resolution);67#endif68 69 div = MAX_DIV / min_div;70 order = fls(div) - 1;71 72 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);73 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);74 pcsp_chip.playback_ptr = 0;75 pcsp_chip.period_ptr = 0;76 atomic_set(&pcsp_chip.timer_active, 0);77 pcsp_chip.enable = 1;78 pcsp_chip.pcspkr = 1;79 80 spin_lock_init(&pcsp_chip.substream_lock);81 82 pcsp_chip.card = card;83 pcsp_chip.port = 0x61;84 pcsp_chip.irq = -1;85 pcsp_chip.dma = -1;86 card->private_data = &pcsp_chip;87 88 return 0;89}90 91static void pcsp_stop_beep(struct snd_pcsp *chip);92 93static void alsa_card_pcsp_free(struct snd_card *card)94{95 pcsp_stop_beep(card->private_data);96}97 98static int snd_card_pcsp_probe(int devnum, struct device *dev)99{100 struct snd_card *card;101 int err;102 103 if (devnum != 0)104 return -EINVAL;105 106 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);107 pcsp_chip.timer.function = pcsp_do_timer;108 109 err = snd_devm_card_new(dev, index, id, THIS_MODULE, 0, &card);110 if (err < 0)111 return err;112 113 err = snd_pcsp_create(card);114 if (err < 0)115 return err;116 117 if (!nopcm) {118 err = snd_pcsp_new_pcm(&pcsp_chip);119 if (err < 0)120 return err;121 }122 err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);123 if (err < 0)124 return err;125 126 strcpy(card->driver, "PC-Speaker");127 strcpy(card->shortname, "pcsp");128 sprintf(card->longname, "Internal PC-Speaker at port 0x%x",129 pcsp_chip.port);130 131 err = snd_card_register(card);132 if (err < 0)133 return err;134 card->private_free = alsa_card_pcsp_free;135 136 return 0;137}138 139static int alsa_card_pcsp_init(struct device *dev)140{141 int err;142 143 err = snd_card_pcsp_probe(0, dev);144 if (err) {145 dev_err(dev, "PC-Speaker initialization failed.\n");146 return err;147 }148 149 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */150 if (debug_pagealloc_enabled()) {151 dev_warn(dev,152 "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, which may make the sound noisy.\n");153 }154 155 return 0;156}157 158static int pcsp_probe(struct platform_device *dev)159{160 int err;161 162 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);163 if (err < 0)164 return err;165 166 err = alsa_card_pcsp_init(&dev->dev);167 if (err < 0)168 return err;169 170 platform_set_drvdata(dev, &pcsp_chip);171 return 0;172}173 174static void pcsp_stop_beep(struct snd_pcsp *chip)175{176 pcsp_sync_stop(chip);177 pcspkr_stop_sound();178}179 180static int pcsp_suspend(struct device *dev)181{182 struct snd_pcsp *chip = dev_get_drvdata(dev);183 pcsp_stop_beep(chip);184 return 0;185}186 187static DEFINE_SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);188 189static void pcsp_shutdown(struct platform_device *dev)190{191 struct snd_pcsp *chip = platform_get_drvdata(dev);192 pcsp_stop_beep(chip);193}194 195static struct platform_driver pcsp_platform_driver = {196 .driver = {197 .name = "pcspkr",198 .pm = &pcsp_pm,199 },200 .probe = pcsp_probe,201 .shutdown = pcsp_shutdown,202};203 204static int __init pcsp_init(void)205{206 if (!enable)207 return -ENODEV;208 return platform_driver_register(&pcsp_platform_driver);209}210 211static void __exit pcsp_exit(void)212{213 platform_driver_unregister(&pcsp_platform_driver);214}215 216module_init(pcsp_init);217module_exit(pcsp_exit);218