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 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_create(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 snd_card_set_dev(pcsp_chip.card, dev); 131 132 strcpy(card->driver, "PC-Speaker"); 133 strcpy(card->shortname, "pcsp"); 134 sprintf(card->longname, "Internal PC-Speaker at port 0x%x", 135 pcsp_chip.port); 136 137 err = snd_card_register(card); 138 if (err < 0) { 139 snd_card_free(card); 140 return err; 141 } 142 143 return 0; 144 } 145 146 static int alsa_card_pcsp_init(struct device *dev) 147 { 148 int err; 149 150 err = snd_card_pcsp_probe(0, dev); 151 if (err) { 152 printk(KERN_ERR "PC-Speaker initialization failed.\n"); 153 return err; 154 } 155 156 #ifdef CONFIG_DEBUG_PAGEALLOC 157 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */ 158 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, " 159 "which may make the sound noisy.\n"); 160 #endif 161 162 return 0; 163 } 164 165 static void alsa_card_pcsp_exit(struct snd_pcsp *chip) 166 { 167 snd_card_free(chip->card); 168 } 169 170 static int pcsp_probe(struct platform_device *dev) 171 { 172 int err; 173 174 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev); 175 if (err < 0) 176 return err; 177 178 err = alsa_card_pcsp_init(&dev->dev); 179 if (err < 0) { 180 pcspkr_input_remove(pcsp_chip.input_dev); 181 return err; 182 } 183 184 platform_set_drvdata(dev, &pcsp_chip); 185 return 0; 186 } 187 188 static int pcsp_remove(struct platform_device *dev) 189 { 190 struct snd_pcsp *chip = platform_get_drvdata(dev); 191 pcspkr_input_remove(chip->input_dev); 192 alsa_card_pcsp_exit(chip); 193 return 0; 194 } 195 196 static void pcsp_stop_beep(struct snd_pcsp *chip) 197 { 198 pcsp_sync_stop(chip); 199 pcspkr_stop_sound(); 200 } 201 202 #ifdef CONFIG_PM_SLEEP 203 static int pcsp_suspend(struct device *dev) 204 { 205 struct snd_pcsp *chip = dev_get_drvdata(dev); 206 pcsp_stop_beep(chip); 207 snd_pcm_suspend_all(chip->pcm); 208 return 0; 209 } 210 211 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL); 212 #define PCSP_PM_OPS &pcsp_pm 213 #else 214 #define PCSP_PM_OPS NULL 215 #endif /* CONFIG_PM_SLEEP */ 216 217 static void pcsp_shutdown(struct platform_device *dev) 218 { 219 struct snd_pcsp *chip = platform_get_drvdata(dev); 220 pcsp_stop_beep(chip); 221 } 222 223 static struct platform_driver pcsp_platform_driver = { 224 .driver = { 225 .name = "pcspkr", 226 .owner = THIS_MODULE, 227 .pm = PCSP_PM_OPS, 228 }, 229 .probe = pcsp_probe, 230 .remove = pcsp_remove, 231 .shutdown = pcsp_shutdown, 232 }; 233 234 static int __init pcsp_init(void) 235 { 236 if (!enable) 237 return -ENODEV; 238 return platform_driver_register(&pcsp_platform_driver); 239 } 240 241 static void __exit pcsp_exit(void) 242 { 243 platform_driver_unregister(&pcsp_platform_driver); 244 } 245 246 module_init(pcsp_init); 247 module_exit(pcsp_exit); 248