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 <asm/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 if (!nopcm) { 50 hrtimer_get_res(CLOCK_MONOTONIC, &tp); 51 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) { 52 printk(KERN_ERR "PCSP: Timer resolution is not sufficient " 53 "(%linS)\n", tp.tv_nsec); 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 && tp.tv_nsec <= 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=%li\n", 67 loops_per_jiffy, min_div, tp.tv_nsec); 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_create(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 snd_card_free(card); 114 return err; 115 } 116 if (!nopcm) { 117 err = snd_pcsp_new_pcm(&pcsp_chip); 118 if (err < 0) { 119 snd_card_free(card); 120 return err; 121 } 122 } 123 err = snd_pcsp_new_mixer(&pcsp_chip, nopcm); 124 if (err < 0) { 125 snd_card_free(card); 126 return err; 127 } 128 129 snd_card_set_dev(pcsp_chip.card, dev); 130 131 strcpy(card->driver, "PC-Speaker"); 132 strcpy(card->shortname, "pcsp"); 133 sprintf(card->longname, "Internal PC-Speaker at port 0x%x", 134 pcsp_chip.port); 135 136 err = snd_card_register(card); 137 if (err < 0) { 138 snd_card_free(card); 139 return err; 140 } 141 142 return 0; 143 } 144 145 static int alsa_card_pcsp_init(struct device *dev) 146 { 147 int err; 148 149 err = snd_card_pcsp_probe(0, dev); 150 if (err) { 151 printk(KERN_ERR "PC-Speaker initialization failed.\n"); 152 return err; 153 } 154 155 #ifdef CONFIG_DEBUG_PAGEALLOC 156 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */ 157 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, " 158 "which may make the sound noisy.\n"); 159 #endif 160 161 return 0; 162 } 163 164 static void alsa_card_pcsp_exit(struct snd_pcsp *chip) 165 { 166 snd_card_free(chip->card); 167 } 168 169 static int pcsp_probe(struct platform_device *dev) 170 { 171 int err; 172 173 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev); 174 if (err < 0) 175 return err; 176 177 err = alsa_card_pcsp_init(&dev->dev); 178 if (err < 0) { 179 pcspkr_input_remove(pcsp_chip.input_dev); 180 return err; 181 } 182 183 platform_set_drvdata(dev, &pcsp_chip); 184 return 0; 185 } 186 187 static int pcsp_remove(struct platform_device *dev) 188 { 189 struct snd_pcsp *chip = platform_get_drvdata(dev); 190 alsa_card_pcsp_exit(chip); 191 pcspkr_input_remove(chip->input_dev); 192 return 0; 193 } 194 195 static void pcsp_stop_beep(struct snd_pcsp *chip) 196 { 197 pcsp_sync_stop(chip); 198 pcspkr_stop_sound(); 199 } 200 201 #ifdef CONFIG_PM_SLEEP 202 static int pcsp_suspend(struct device *dev) 203 { 204 struct snd_pcsp *chip = dev_get_drvdata(dev); 205 pcsp_stop_beep(chip); 206 snd_pcm_suspend_all(chip->pcm); 207 return 0; 208 } 209 210 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL); 211 #define PCSP_PM_OPS &pcsp_pm 212 #else 213 #define PCSP_PM_OPS NULL 214 #endif /* CONFIG_PM_SLEEP */ 215 216 static void pcsp_shutdown(struct platform_device *dev) 217 { 218 struct snd_pcsp *chip = platform_get_drvdata(dev); 219 pcsp_stop_beep(chip); 220 } 221 222 static struct platform_driver pcsp_platform_driver = { 223 .driver = { 224 .name = "pcspkr", 225 .owner = THIS_MODULE, 226 .pm = PCSP_PM_OPS, 227 }, 228 .probe = pcsp_probe, 229 .remove = pcsp_remove, 230 .shutdown = pcsp_shutdown, 231 }; 232 233 static int __init pcsp_init(void) 234 { 235 if (!enable) 236 return -ENODEV; 237 return platform_driver_register(&pcsp_platform_driver); 238 } 239 240 static void __exit pcsp_exit(void) 241 { 242 platform_driver_unregister(&pcsp_platform_driver); 243 } 244 245 module_init(pcsp_init); 246 module_exit(pcsp_exit); 247