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/moduleparam.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 int enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */ 29 30 module_param(index, int, 0444); 31 MODULE_PARM_DESC(index, "Index value for pcsp soundcard."); 32 module_param(id, charp, 0444); 33 MODULE_PARM_DESC(id, "ID string for pcsp soundcard."); 34 module_param(enable, bool, 0444); 35 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound."); 36 37 struct snd_pcsp pcsp_chip; 38 39 static int __devinit snd_pcsp_create(struct snd_card *card) 40 { 41 static struct snd_device_ops ops = { }; 42 struct timespec tp; 43 int err; 44 int div, min_div, order; 45 46 hrtimer_get_res(CLOCK_MONOTONIC, &tp); 47 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) { 48 printk(KERN_ERR "PCSP: Timer resolution is not sufficient " 49 "(%linS)\n", tp.tv_nsec); 50 printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI " 51 "enabled.\n"); 52 return -EIO; 53 } 54 55 if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS) 56 min_div = MIN_DIV; 57 else 58 min_div = MAX_DIV; 59 #if PCSP_DEBUG 60 printk("PCSP: lpj=%li, min_div=%i, res=%li\n", 61 loops_per_jiffy, min_div, tp.tv_nsec); 62 #endif 63 64 div = MAX_DIV / min_div; 65 order = fls(div) - 1; 66 67 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE); 68 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE); 69 pcsp_chip.playback_ptr = 0; 70 pcsp_chip.period_ptr = 0; 71 atomic_set(&pcsp_chip.timer_active, 0); 72 pcsp_chip.enable = 1; 73 pcsp_chip.pcspkr = 1; 74 75 spin_lock_init(&pcsp_chip.substream_lock); 76 77 pcsp_chip.card = card; 78 pcsp_chip.port = 0x61; 79 pcsp_chip.irq = -1; 80 pcsp_chip.dma = -1; 81 82 /* Register device */ 83 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops); 84 if (err < 0) 85 return err; 86 87 return 0; 88 } 89 90 static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev) 91 { 92 struct snd_card *card; 93 int err; 94 95 if (devnum != 0) 96 return -EINVAL; 97 98 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 99 pcsp_chip.timer.cb_mode = HRTIMER_CB_IRQSAFE; 100 pcsp_chip.timer.function = pcsp_do_timer; 101 102 card = snd_card_new(index, id, THIS_MODULE, 0); 103 if (!card) 104 return -ENOMEM; 105 106 err = snd_pcsp_create(card); 107 if (err < 0) { 108 snd_card_free(card); 109 return err; 110 } 111 err = snd_pcsp_new_pcm(&pcsp_chip); 112 if (err < 0) { 113 snd_card_free(card); 114 return err; 115 } 116 err = snd_pcsp_new_mixer(&pcsp_chip); 117 if (err < 0) { 118 snd_card_free(card); 119 return err; 120 } 121 122 snd_card_set_dev(pcsp_chip.card, dev); 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 snd_card_free(card); 132 return err; 133 } 134 135 return 0; 136 } 137 138 static int __devinit alsa_card_pcsp_init(struct device *dev) 139 { 140 int err; 141 142 err = snd_card_pcsp_probe(0, dev); 143 if (err) { 144 printk(KERN_ERR "PC-Speaker initialization failed.\n"); 145 return err; 146 } 147 148 #ifdef CONFIG_DEBUG_PAGEALLOC 149 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */ 150 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, " 151 "which may make the sound noisy.\n"); 152 #endif 153 154 return 0; 155 } 156 157 static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip) 158 { 159 snd_card_free(chip->card); 160 } 161 162 static int __devinit pcsp_probe(struct platform_device *dev) 163 { 164 int err; 165 166 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev); 167 if (err < 0) 168 return err; 169 170 err = alsa_card_pcsp_init(&dev->dev); 171 if (err < 0) { 172 pcspkr_input_remove(pcsp_chip.input_dev); 173 return err; 174 } 175 176 platform_set_drvdata(dev, &pcsp_chip); 177 return 0; 178 } 179 180 static int __devexit pcsp_remove(struct platform_device *dev) 181 { 182 struct snd_pcsp *chip = platform_get_drvdata(dev); 183 alsa_card_pcsp_exit(chip); 184 pcspkr_input_remove(chip->input_dev); 185 platform_set_drvdata(dev, NULL); 186 return 0; 187 } 188 189 static void pcsp_stop_beep(struct snd_pcsp *chip) 190 { 191 spin_lock_irq(&chip->substream_lock); 192 if (!chip->playback_substream) 193 pcspkr_stop_sound(); 194 spin_unlock_irq(&chip->substream_lock); 195 } 196 197 #ifdef CONFIG_PM 198 static int pcsp_suspend(struct platform_device *dev, pm_message_t state) 199 { 200 struct snd_pcsp *chip = platform_get_drvdata(dev); 201 pcsp_stop_beep(chip); 202 snd_pcm_suspend_all(chip->pcm); 203 return 0; 204 } 205 #else 206 #define pcsp_suspend NULL 207 #endif /* CONFIG_PM */ 208 209 static void pcsp_shutdown(struct platform_device *dev) 210 { 211 struct snd_pcsp *chip = platform_get_drvdata(dev); 212 pcsp_stop_beep(chip); 213 } 214 215 static struct platform_driver pcsp_platform_driver = { 216 .driver = { 217 .name = "pcspkr", 218 .owner = THIS_MODULE, 219 }, 220 .probe = pcsp_probe, 221 .remove = __devexit_p(pcsp_remove), 222 .suspend = pcsp_suspend, 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); 240