sound/drivers/pcsp/pcsp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * PC-Speaker driver for Linux
   4  *
   5  * Copyright (C) 1997-2001  David Woodhouse
   6  * Copyright (C) 2001-2008  Stas Sergeev
   7  */
   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
  22 MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
  23 MODULE_DESCRIPTION("PC-Speaker driver");
  24 MODULE_LICENSE("GPL");
  25 MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
  26 MODULE_ALIAS("platform:pcspkr");
  27
  28 static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
  29 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  30 static bool enable = SNDRV_DEFAULT_ENABLE1;     /* Enable this card */
  31 static bool nopcm;      /* Disable PCM capability of the driver */
  32
  33 module_param(index, int, 0444);
  34 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
  35 module_param(id, charp, 0444);
  36 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
  37 module_param(enable, bool, 0444);
  38 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
  39 module_param(nopcm, bool, 0444);
  40 MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
  41
  42 struct snd_pcsp pcsp_chip;
  43
  44 static int snd_pcsp_create(struct snd_card *card)
  45 {
  46         static struct snd_device_ops ops = { };
  47         unsigned int resolution = hrtimer_resolution;
  48         int err, div, min_div, order;
  49
  50         if (!nopcm) {
  51                 if (resolution > PCSP_MAX_PERIOD_NS) {
  52                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
  53                                 "(%unS)\n", resolution);
  54                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
  55                                 "enabled.\n");
  56                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
  57                         nopcm = 1;
  58                 }
  59         }
  60
  61         if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
  62                 min_div = MIN_DIV;
  63         else
  64                 min_div = MAX_DIV;
  65 #if PCSP_DEBUG
  66         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
  67                loops_per_jiffy, min_div, resolution);
  68 #endif
  69
  70         div = MAX_DIV / min_div;
  71         order = fls(div) - 1;
  72
  73         pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
  74         pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
  75         pcsp_chip.playback_ptr = 0;
  76         pcsp_chip.period_ptr = 0;
  77         atomic_set(&pcsp_chip.timer_active, 0);
  78         pcsp_chip.enable = 1;
  79         pcsp_chip.pcspkr = 1;
  80
  81         spin_lock_init(&pcsp_chip.substream_lock);
  82
  83         pcsp_chip.card = card;
  84         pcsp_chip.port = 0x61;
  85         pcsp_chip.irq = -1;
  86         pcsp_chip.dma = -1;
  87
  88         /* Register device */
  89         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
  90         if (err < 0)
  91                 return err;
  92
  93         return 0;
  94 }
  95
  96 static int snd_card_pcsp_probe(int devnum, struct device *dev)
  97 {
  98         struct snd_card *card;
  99         int err;
 100
 101         if (devnum != 0)
 102                 return -EINVAL;
 103
 104         hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 105         pcsp_chip.timer.function = pcsp_do_timer;
 106
 107         err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card);
 108         if (err < 0)
 109                 return err;
 110
 111         err = snd_pcsp_create(card);
 112         if (err < 0)
 113                 goto free_card;
 114
 115         if (!nopcm) {
 116                 err = snd_pcsp_new_pcm(&pcsp_chip);
 117                 if (err < 0)
 118                         goto free_card;
 119         }
 120         err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
 121         if (err < 0)
 122                 goto free_card;
 123
 124         strcpy(card->driver, "PC-Speaker");
 125         strcpy(card->shortname, "pcsp");
 126         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
 127                 pcsp_chip.port);
 128
 129         err = snd_card_register(card);
 130         if (err < 0)
 131                 goto free_card;
 132
 133         return 0;
 134
 135 free_card:
 136         snd_card_free(card);
 137         return err;
 138 }
 139
 140 static int alsa_card_pcsp_init(struct device *dev)
 141 {
 142         int err;
 143
 144         err = snd_card_pcsp_probe(0, dev);
 145         if (err) {
 146                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
 147                 return err;
 148         }
 149
 150         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
 151         if (debug_pagealloc_enabled()) {
 152                 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
 153                        "which may make the sound noisy.\n");
 154         }
 155
 156         return 0;
 157 }
 158
 159 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
 160 {
 161         snd_card_free(chip->card);
 162 }
 163
 164 static int pcsp_probe(struct platform_device *dev)
 165 {
 166         int err;
 167
 168         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
 169         if (err < 0)
 170                 return err;
 171
 172         err = alsa_card_pcsp_init(&dev->dev);
 173         if (err < 0) {
 174                 pcspkr_input_remove(pcsp_chip.input_dev);
 175                 return err;
 176         }
 177
 178         platform_set_drvdata(dev, &pcsp_chip);
 179         return 0;
 180 }
 181
 182 static int pcsp_remove(struct platform_device *dev)
 183 {
 184         struct snd_pcsp *chip = platform_get_drvdata(dev);
 185         pcspkr_input_remove(chip->input_dev);
 186         alsa_card_pcsp_exit(chip);
 187         return 0;
 188 }
 189
 190 static void pcsp_stop_beep(struct snd_pcsp *chip)
 191 {
 192         pcsp_sync_stop(chip);
 193         pcspkr_stop_sound();
 194 }
 195
 196 #ifdef CONFIG_PM_SLEEP
 197 static int pcsp_suspend(struct device *dev)
 198 {
 199         struct snd_pcsp *chip = dev_get_drvdata(dev);
 200         pcsp_stop_beep(chip);
 201         return 0;
 202 }
 203
 204 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
 205 #define PCSP_PM_OPS     &pcsp_pm
 206 #else
 207 #define PCSP_PM_OPS     NULL
 208 #endif  /* CONFIG_PM_SLEEP */
 209
 210 static void pcsp_shutdown(struct platform_device *dev)
 211 {
 212         struct snd_pcsp *chip = platform_get_drvdata(dev);
 213         pcsp_stop_beep(chip);
 214 }
 215
 216 static struct platform_driver pcsp_platform_driver = {
 217         .driver         = {
 218                 .name   = "pcspkr",
 219                 .pm     = PCSP_PM_OPS,
 220         },
 221         .probe          = pcsp_probe,
 222         .remove         = pcsp_remove,
 223         .shutdown       = pcsp_shutdown,
 224 };
 225
 226 static int __init pcsp_init(void)
 227 {
 228         if (!enable)
 229                 return -ENODEV;
 230         return platform_driver_register(&pcsp_platform_driver);
 231 }
 232
 233 static void __exit pcsp_exit(void)
 234 {
 235         platform_driver_unregister(&pcsp_platform_driver);
 236 }
 237
 238 module_init(pcsp_init);
 239 module_exit(pcsp_exit);