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 struct timespec tp; 46 int err; 47 int div, min_div, order; 48 49 hrtimer_get_res(CLOCK_MONOTONIC, &tp); 50 51 if (!nopcm) { 52 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) { 53 printk(KERN_ERR "PCSP: Timer resolution is not sufficient " 54 "(%linS)\n", tp.tv_nsec); 55 printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI " 56 "enabled.\n"); 57 printk(KERN_ERR "PCSP: Turned into nopcm mode.\n"); 58 nopcm = 1; 59 } 60 } 61 62 if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS) 63 min_div = MIN_DIV; 64 else 65 min_div = MAX_DIV; 66 #if PCSP_DEBUG 67 printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%li\n", 68 loops_per_jiffy, min_div, tp.tv_nsec); 69 #endif 70 71 div = MAX_DIV / min_div; 72 order = fls(div) - 1; 73 74 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE); 75 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE); 76 pcsp_chip.playback_ptr = 0; 77 pcsp_chip.period_ptr = 0; 78 atomic_set(&pcsp_chip.timer_active, 0); 79 pcsp_chip.enable = 1; 80 pcsp_chip.pcspkr = 1; 81 82 spin_lock_init(&pcsp_chip.substream_lock); 83 84 pcsp_chip.card = card; 85 pcsp_chip.port = 0x61; 86 pcsp_chip.irq = -1; 87 pcsp_chip.dma = -1; 88 89 /* Register device */ 90 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops); 91 if (err < 0) 92 return err; 93 94 return 0; 95 } 96 97 static int snd_card_pcsp_probe(int devnum, struct device *dev) 98 { 99 struct snd_card *card; 100 int err; 101 102 if (devnum != 0) 103 return -EINVAL; 104 105 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 106 pcsp_chip.timer.function = pcsp_do_timer; 107 108 err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card); 109 if (err < 0) 110 return err; 111 112 err = snd_pcsp_create(card); 113 if (err < 0) { 114 snd_card_free(card); 115 return err; 116 } 117 if (!nopcm) { 118 err = snd_pcsp_new_pcm(&pcsp_chip); 119 if (err < 0) { 120 snd_card_free(card); 121 return err; 122 } 123 } 124 err = snd_pcsp_new_mixer(&pcsp_chip, nopcm); 125 if (err < 0) { 126 snd_card_free(card); 127 return err; 128 } 129 130 strcpy(card->driver, "PC-Speaker"); 131 strcpy(card->shortname, "pcsp"); 132 sprintf(card->longname, "Internal PC-Speaker at port 0x%x", 133 pcsp_chip.port); 134 135 err = snd_card_register(card); 136 if (err < 0) { 137 snd_card_free(card); 138 return err; 139 } 140 141 return 0; 142 } 143 144 static int alsa_card_pcsp_init(struct device *dev) 145 { 146 int err; 147 148 err = snd_card_pcsp_probe(0, dev); 149 if (err) { 150 printk(KERN_ERR "PC-Speaker initialization failed.\n"); 151 return err; 152 } 153 154 #ifdef CONFIG_DEBUG_PAGEALLOC 155 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */ 156 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, " 157 "which may make the sound noisy.\n"); 158 #endif 159 160 return 0; 161 } 162 163 static void alsa_card_pcsp_exit(struct snd_pcsp *chip) 164 { 165 snd_card_free(chip->card); 166 } 167 168 static int pcsp_probe(struct platform_device *dev) 169 { 170 int err; 171 172 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev); 173 if (err < 0) 174 return err; 175 176 err = alsa_card_pcsp_init(&dev->dev); 177 if (err < 0) { 178 pcspkr_input_remove(pcsp_chip.input_dev); 179 return err; 180 } 181 182 platform_set_drvdata(dev, &pcsp_chip); 183 return 0; 184 } 185 186 static int pcsp_remove(struct platform_device *dev) 187 { 188 struct snd_pcsp *chip = platform_get_drvdata(dev); 189 pcspkr_input_remove(chip->input_dev); 190 alsa_card_pcsp_exit(chip); 191 return 0; 192 } 193 194 static void pcsp_stop_beep(struct snd_pcsp *chip) 195 { 196 pcsp_sync_stop(chip); 197 pcspkr_stop_sound(); 198 } 199 200 #ifdef CONFIG_PM_SLEEP 201 static int pcsp_suspend(struct device *dev) 202 { 203 struct snd_pcsp *chip = dev_get_drvdata(dev); 204 pcsp_stop_beep(chip); 205 snd_pcm_suspend_all(chip->pcm); 206 return 0; 207 } 208 209 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL); 210 #define PCSP_PM_OPS &pcsp_pm 211 #else 212 #define PCSP_PM_OPS NULL 213 #endif /* CONFIG_PM_SLEEP */ 214 215 static void pcsp_shutdown(struct platform_device *dev) 216 { 217 struct snd_pcsp *chip = platform_get_drvdata(dev); 218 pcsp_stop_beep(chip); 219 } 220 221 static struct platform_driver pcsp_platform_driver = { 222 .driver = { 223 .name = "pcspkr", 224 .pm = PCSP_PM_OPS, 225 }, 226 .probe = pcsp_probe, 227 .remove = pcsp_remove, 228 .shutdown = pcsp_shutdown, 229 }; 230 231 static int __init pcsp_init(void) 232 { 233 if (!enable) 234 return -ENODEV; 235 return platform_driver_register(&pcsp_platform_driver); 236 } 237 238 static void __exit pcsp_exit(void) 239 { 240 platform_driver_unregister(&pcsp_platform_driver); 241 } 242 243 module_init(pcsp_init); 244 module_exit(pcsp_exit); 245