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

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