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Linux/sound/drivers/pcsp/pcsp.c

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  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         platform_set_drvdata(dev, NULL);
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 

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