1 /* 2 * PC-Speaker driver for Linux 3 * 4 * Copyright (C) 1997-2001 David Woodhouse 5 * Copyright (C) 2001-2008 Stas Sergeev 6 */ 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <sound/core.h> 12 #include <sound/initval.h> 13 #include <sound/pcm.h> 14 #include <linux/input.h> 15 #include <linux/delay.h> 16 #include <linux/bitops.h> 17 #include "pcsp_input.h" 18 #include "pcsp.h" 19 20 MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>"); 21 MODULE_DESCRIPTION("PC-Speaker driver"); 22 MODULE_LICENSE("GPL"); 23 MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}"); 24 MODULE_ALIAS("platform:pcspkr"); 25 26 static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */ 27 static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */ 28 static bool enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */ 29 static bool nopcm; /* Disable PCM capability of the driver */ 30 31 module_param(index, int, 0444); 32 MODULE_PARM_DESC(index, "Index value for pcsp soundcard."); 33 module_param(id, charp, 0444); 34 MODULE_PARM_DESC(id, "ID string for pcsp soundcard."); 35 module_param(enable, bool, 0444); 36 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound."); 37 module_param(nopcm, bool, 0444); 38 MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain."); 39 40 struct snd_pcsp pcsp_chip; 41 42 static int snd_pcsp_create(struct snd_card *card) 43 { 44 static struct snd_device_ops ops = { }; 45 unsigned int resolution = hrtimer_resolution; 46 int err, div, min_div, order; 47 48 if (!nopcm) { 49 if (resolution > PCSP_MAX_PERIOD_NS) { 50 printk(KERN_ERR "PCSP: Timer resolution is not sufficient " 51 "(%unS)\n", resolution); 52 printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI " 53 "enabled.\n"); 54 printk(KERN_ERR "PCSP: Turned into nopcm mode.\n"); 55 nopcm = 1; 56 } 57 } 58 59 if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS) 60 min_div = MIN_DIV; 61 else 62 min_div = MAX_DIV; 63 #if PCSP_DEBUG 64 printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n", 65 loops_per_jiffy, min_div, resolution); 66 #endif 67 68 div = MAX_DIV / min_div; 69 order = fls(div) - 1; 70 71 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE); 72 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE); 73 pcsp_chip.playback_ptr = 0; 74 pcsp_chip.period_ptr = 0; 75 atomic_set(&pcsp_chip.timer_active, 0); 76 pcsp_chip.enable = 1; 77 pcsp_chip.pcspkr = 1; 78 79 spin_lock_init(&pcsp_chip.substream_lock); 80 81 pcsp_chip.card = card; 82 pcsp_chip.port = 0x61; 83 pcsp_chip.irq = -1; 84 pcsp_chip.dma = -1; 85 86 /* Register device */ 87 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops); 88 if (err < 0) 89 return err; 90 91 return 0; 92 } 93 94 static int snd_card_pcsp_probe(int devnum, struct device *dev) 95 { 96 struct snd_card *card; 97 int err; 98 99 if (devnum != 0) 100 return -EINVAL; 101 102 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 103 pcsp_chip.timer.function = pcsp_do_timer; 104 105 err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card); 106 if (err < 0) 107 return err; 108 109 err = snd_pcsp_create(card); 110 if (err < 0) { 111 snd_card_free(card); 112 return err; 113 } 114 if (!nopcm) { 115 err = snd_pcsp_new_pcm(&pcsp_chip); 116 if (err < 0) { 117 snd_card_free(card); 118 return err; 119 } 120 } 121 err = snd_pcsp_new_mixer(&pcsp_chip, nopcm); 122 if (err < 0) { 123 snd_card_free(card); 124 return err; 125 } 126 127 strcpy(card->driver, "PC-Speaker"); 128 strcpy(card->shortname, "pcsp"); 129 sprintf(card->longname, "Internal PC-Speaker at port 0x%x", 130 pcsp_chip.port); 131 132 err = snd_card_register(card); 133 if (err < 0) { 134 snd_card_free(card); 135 return err; 136 } 137 138 return 0; 139 } 140 141 static int alsa_card_pcsp_init(struct device *dev) 142 { 143 int err; 144 145 err = snd_card_pcsp_probe(0, dev); 146 if (err) { 147 printk(KERN_ERR "PC-Speaker initialization failed.\n"); 148 return err; 149 } 150 151 #ifdef CONFIG_DEBUG_PAGEALLOC 152 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */ 153 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, " 154 "which may make the sound noisy.\n"); 155 #endif 156 157 return 0; 158 } 159 160 static void alsa_card_pcsp_exit(struct snd_pcsp *chip) 161 { 162 snd_card_free(chip->card); 163 } 164 165 static int pcsp_probe(struct platform_device *dev) 166 { 167 int err; 168 169 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev); 170 if (err < 0) 171 return err; 172 173 err = alsa_card_pcsp_init(&dev->dev); 174 if (err < 0) { 175 pcspkr_input_remove(pcsp_chip.input_dev); 176 return err; 177 } 178 179 platform_set_drvdata(dev, &pcsp_chip); 180 return 0; 181 } 182 183 static int pcsp_remove(struct platform_device *dev) 184 { 185 struct snd_pcsp *chip = platform_get_drvdata(dev); 186 pcspkr_input_remove(chip->input_dev); 187 alsa_card_pcsp_exit(chip); 188 return 0; 189 } 190 191 static void pcsp_stop_beep(struct snd_pcsp *chip) 192 { 193 pcsp_sync_stop(chip); 194 pcspkr_stop_sound(); 195 } 196 197 #ifdef CONFIG_PM_SLEEP 198 static int pcsp_suspend(struct device *dev) 199 { 200 struct snd_pcsp *chip = dev_get_drvdata(dev); 201 pcsp_stop_beep(chip); 202 snd_pcm_suspend_all(chip->pcm); 203 return 0; 204 } 205 206 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL); 207 #define PCSP_PM_OPS &pcsp_pm 208 #else 209 #define PCSP_PM_OPS NULL 210 #endif /* CONFIG_PM_SLEEP */ 211 212 static void pcsp_shutdown(struct platform_device *dev) 213 { 214 struct snd_pcsp *chip = platform_get_drvdata(dev); 215 pcsp_stop_beep(chip); 216 } 217 218 static struct platform_driver pcsp_platform_driver = { 219 .driver = { 220 .name = "pcspkr", 221 .pm = PCSP_PM_OPS, 222 }, 223 .probe = pcsp_probe, 224 .remove = pcsp_remove, 225 .shutdown = pcsp_shutdown, 226 }; 227 228 static int __init pcsp_init(void) 229 { 230 if (!enable) 231 return -ENODEV; 232 return platform_driver_register(&pcsp_platform_driver); 233 } 234 235 static void __exit pcsp_exit(void) 236 { 237 platform_driver_unregister(&pcsp_platform_driver); 238 } 239 240 module_init(pcsp_init); 241 module_exit(pcsp_exit); 242