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Linux/sound/drivers/pcsp/pcsp.c

  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 <linux/mm.h>
 18 #include "pcsp_input.h"
 19 #include "pcsp.h"
 20 
 21 MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
 22 MODULE_DESCRIPTION("PC-Speaker driver");
 23 MODULE_LICENSE("GPL");
 24 MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
 25 MODULE_ALIAS("platform:pcspkr");
 26 
 27 static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
 28 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
 29 static bool enable = SNDRV_DEFAULT_ENABLE1;     /* Enable this card */
 30 static bool nopcm;      /* Disable PCM capability of the driver */
 31 
 32 module_param(index, int, 0444);
 33 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
 34 module_param(id, charp, 0444);
 35 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
 36 module_param(enable, bool, 0444);
 37 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
 38 module_param(nopcm, bool, 0444);
 39 MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
 40 
 41 struct snd_pcsp pcsp_chip;
 42 
 43 static int snd_pcsp_create(struct snd_card *card)
 44 {
 45         static struct snd_device_ops ops = { };
 46         unsigned int resolution = hrtimer_resolution;
 47         int err, div, min_div, order;
 48 
 49         if (!nopcm) {
 50                 if (resolution > PCSP_MAX_PERIOD_NS) {
 51                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
 52                                 "(%unS)\n", resolution);
 53                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
 54                                 "enabled.\n");
 55                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
 56                         nopcm = 1;
 57                 }
 58         }
 59 
 60         if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
 61                 min_div = MIN_DIV;
 62         else
 63                 min_div = MAX_DIV;
 64 #if PCSP_DEBUG
 65         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
 66                loops_per_jiffy, min_div, resolution);
 67 #endif
 68 
 69         div = MAX_DIV / min_div;
 70         order = fls(div) - 1;
 71 
 72         pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
 73         pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
 74         pcsp_chip.playback_ptr = 0;
 75         pcsp_chip.period_ptr = 0;
 76         atomic_set(&pcsp_chip.timer_active, 0);
 77         pcsp_chip.enable = 1;
 78         pcsp_chip.pcspkr = 1;
 79 
 80         spin_lock_init(&pcsp_chip.substream_lock);
 81 
 82         pcsp_chip.card = card;
 83         pcsp_chip.port = 0x61;
 84         pcsp_chip.irq = -1;
 85         pcsp_chip.dma = -1;
 86 
 87         /* Register device */
 88         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
 89         if (err < 0)
 90                 return err;
 91 
 92         return 0;
 93 }
 94 
 95 static int snd_card_pcsp_probe(int devnum, struct device *dev)
 96 {
 97         struct snd_card *card;
 98         int err;
 99 
100         if (devnum != 0)
101                 return -EINVAL;
102 
103         hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
104         pcsp_chip.timer.function = pcsp_do_timer;
105 
106         err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card);
107         if (err < 0)
108                 return err;
109 
110         err = snd_pcsp_create(card);
111         if (err < 0) {
112                 snd_card_free(card);
113                 return err;
114         }
115         if (!nopcm) {
116                 err = snd_pcsp_new_pcm(&pcsp_chip);
117                 if (err < 0) {
118                         snd_card_free(card);
119                         return err;
120                 }
121         }
122         err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
123         if (err < 0) {
124                 snd_card_free(card);
125                 return err;
126         }
127 
128         strcpy(card->driver, "PC-Speaker");
129         strcpy(card->shortname, "pcsp");
130         sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
131                 pcsp_chip.port);
132 
133         err = snd_card_register(card);
134         if (err < 0) {
135                 snd_card_free(card);
136                 return err;
137         }
138 
139         return 0;
140 }
141 
142 static int alsa_card_pcsp_init(struct device *dev)
143 {
144         int err;
145 
146         err = snd_card_pcsp_probe(0, dev);
147         if (err) {
148                 printk(KERN_ERR "PC-Speaker initialization failed.\n");
149                 return err;
150         }
151 
152         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
153         if (debug_pagealloc_enabled()) {
154                 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
155                        "which may make the sound noisy.\n");
156         }
157 
158         return 0;
159 }
160 
161 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
162 {
163         snd_card_free(chip->card);
164 }
165 
166 static int pcsp_probe(struct platform_device *dev)
167 {
168         int err;
169 
170         err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
171         if (err < 0)
172                 return err;
173 
174         err = alsa_card_pcsp_init(&dev->dev);
175         if (err < 0) {
176                 pcspkr_input_remove(pcsp_chip.input_dev);
177                 return err;
178         }
179 
180         platform_set_drvdata(dev, &pcsp_chip);
181         return 0;
182 }
183 
184 static int pcsp_remove(struct platform_device *dev)
185 {
186         struct snd_pcsp *chip = platform_get_drvdata(dev);
187         pcspkr_input_remove(chip->input_dev);
188         alsa_card_pcsp_exit(chip);
189         return 0;
190 }
191 
192 static void pcsp_stop_beep(struct snd_pcsp *chip)
193 {
194         pcsp_sync_stop(chip);
195         pcspkr_stop_sound();
196 }
197 
198 #ifdef CONFIG_PM_SLEEP
199 static int pcsp_suspend(struct device *dev)
200 {
201         struct snd_pcsp *chip = dev_get_drvdata(dev);
202         pcsp_stop_beep(chip);
203         snd_pcm_suspend_all(chip->pcm);
204         return 0;
205 }
206 
207 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
208 #define PCSP_PM_OPS     &pcsp_pm
209 #else
210 #define PCSP_PM_OPS     NULL
211 #endif  /* CONFIG_PM_SLEEP */
212 
213 static void pcsp_shutdown(struct platform_device *dev)
214 {
215         struct snd_pcsp *chip = platform_get_drvdata(dev);
216         pcsp_stop_beep(chip);
217 }
218 
219 static struct platform_driver pcsp_platform_driver = {
220         .driver         = {
221                 .name   = "pcspkr",
222                 .pm     = PCSP_PM_OPS,
223         },
224         .probe          = pcsp_probe,
225         .remove         = pcsp_remove,
226         .shutdown       = pcsp_shutdown,
227 };
228 
229 static int __init pcsp_init(void)
230 {
231         if (!enable)
232                 return -ENODEV;
233         return platform_driver_register(&pcsp_platform_driver);
234 }
235 
236 static void __exit pcsp_exit(void)
237 {
238         platform_driver_unregister(&pcsp_platform_driver);
239 }
240 
241 module_init(pcsp_init);
242 module_exit(pcsp_exit);
243 

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