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authorStas Sergeev <stsp@aknet.ru>2008-03-03 04:53:54 -0500
committerTakashi Iwai <tiwai@suse.de>2008-04-24 06:00:20 -0400
commit9ab4d072ad67793d70b8707e14fb9261749c4e07 (patch)
treec6ae32f1d3d3b273fae30b0fa59b8c79bd5e8044 /sound/drivers/pcsp/pcsp.c
parent40ac8c4f208111cdc1542ccc9feb21b98a6b0219 (diff)
[ALSA] Add PC-speaker sound driver
Added PC-speaker sound driver (snd-pcsp). Signed-off-by: Stas Sergeev <stsp@aknet.ru> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/drivers/pcsp/pcsp.c')
-rw-r--r--sound/drivers/pcsp/pcsp.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
new file mode 100644
index 000000000000..34477286b394
--- /dev/null
+++ b/sound/drivers/pcsp/pcsp.c
@@ -0,0 +1,241 @@
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
15#include <linux/input.h>
16#include <linux/delay.h>
17#include <asm/bitops.h>
18#include "pcsp_input.h"
19#include "pcsp.h"
20
21MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
22MODULE_DESCRIPTION("PC-Speaker driver");
23MODULE_LICENSE("GPL");
24MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
25MODULE_ALIAS("platform:pcspkr");
26
27static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */
28static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */
29static int enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */
30
31module_param(index, int, 0444);
32MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
33module_param(id, charp, 0444);
34MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
35module_param(enable, bool, 0444);
36MODULE_PARM_DESC(enable, "dummy");
37
38struct snd_pcsp pcsp_chip;
39
40static int __devinit snd_pcsp_create(struct snd_card *card)
41{
42 static struct snd_device_ops ops = { };
43 struct timespec tp;
44 int err;
45 int div, min_div, order;
46
47 hrtimer_get_res(CLOCK_MONOTONIC, &tp);
48 if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
49 printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
50 "(%linS)\n", tp.tv_nsec);
51 printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
52 "enabled.\n");
53 return -EIO;
54 }
55
56 if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
57 min_div = MIN_DIV;
58 else
59 min_div = MAX_DIV;
60#if PCSP_DEBUG
61 printk("PCSP: lpj=%li, min_div=%i, res=%li\n",
62 loops_per_jiffy, min_div, tp.tv_nsec);
63#endif
64
65 div = MAX_DIV / min_div;
66 order = fls(div) - 1;
67
68 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
69 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
70 pcsp_chip.playback_ptr = 0;
71 pcsp_chip.period_ptr = 0;
72 atomic_set(&pcsp_chip.timer_active, 0);
73 pcsp_chip.enable = 1;
74 pcsp_chip.pcspkr = 1;
75
76 spin_lock_init(&pcsp_chip.substream_lock);
77
78 pcsp_chip.card = card;
79 pcsp_chip.port = 0x61;
80 pcsp_chip.irq = -1;
81 pcsp_chip.dma = -1;
82
83 /* Register device */
84 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
85 if (err < 0)
86 return err;
87
88 return 0;
89}
90
91static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
92{
93 struct snd_card *card;
94 int err;
95
96 if (devnum != 0)
97 return -EINVAL;
98
99 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
100 pcsp_chip.timer.cb_mode = HRTIMER_CB_IRQSAFE;
101 pcsp_chip.timer.function = pcsp_do_timer;
102
103 card = snd_card_new(index, id, THIS_MODULE, 0);
104 if (!card)
105 return -ENOMEM;
106
107 err = snd_pcsp_create(card);
108 if (err < 0) {
109 snd_card_free(card);
110 return err;
111 }
112 err = snd_pcsp_new_pcm(&pcsp_chip);
113 if (err < 0) {
114 snd_card_free(card);
115 return err;
116 }
117 err = snd_pcsp_new_mixer(&pcsp_chip);
118 if (err < 0) {
119 snd_card_free(card);
120 return err;
121 }
122
123 snd_card_set_dev(pcsp_chip.card, dev);
124
125 strcpy(card->driver, "PC-Speaker");
126 strcpy(card->shortname, "pcsp");
127 sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
128 pcsp_chip.port);
129
130 err = snd_card_register(card);
131 if (err < 0) {
132 snd_card_free(card);
133 return err;
134 }
135
136 return 0;
137}
138
139static int __devinit alsa_card_pcsp_init(struct device *dev)
140{
141 int devnum = 0, cards = 0;
142
143#ifdef CONFIG_DEBUG_PAGEALLOC
144 /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
145 printk(KERN_WARNING
146 "PCSP: Warning, CONFIG_DEBUG_PAGEALLOC is enabled!\n"
147 "You have to disable it if you want to use the PC-Speaker "
148 "driver.\n"
149 "Unless it is disabled, enjoy the horrible, distorted "
150 "and crackling noise.\n");
151#endif
152
153 if (enable) {
154 if (snd_card_pcsp_probe(devnum, dev) >= 0)
155 cards++;
156 if (!cards) {
157 printk(KERN_ERR "PC-Speaker initialization failed.\n");
158 return -ENODEV;
159 }
160 }
161
162 return 0;
163}
164
165static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
166{
167 snd_card_free(chip->card);
168}
169
170static int __devinit pcsp_probe(struct platform_device *dev)
171{
172 int err;
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
187static int __devexit 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
196static void pcsp_stop_beep(struct snd_pcsp *chip)
197{
198 unsigned long flags;
199 spin_lock_irqsave(&chip->substream_lock, flags);
200 if (!chip->playback_substream)
201 pcspkr_stop_sound();
202 spin_unlock_irqrestore(&chip->substream_lock, flags);
203}
204
205static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
206{
207 struct snd_pcsp *chip = platform_get_drvdata(dev);
208 pcsp_stop_beep(chip);
209 snd_pcm_suspend_all(chip->pcm);
210 return 0;
211}
212
213static void pcsp_shutdown(struct platform_device *dev)
214{
215 struct snd_pcsp *chip = platform_get_drvdata(dev);
216 pcsp_stop_beep(chip);
217}
218
219static struct platform_driver pcsp_platform_driver = {
220 .driver = {
221 .name = "pcspkr",
222 .owner = THIS_MODULE,
223 },
224 .probe = pcsp_probe,
225 .remove = __devexit_p(pcsp_remove),
226 .suspend = pcsp_suspend,
227 .shutdown = pcsp_shutdown,
228};
229
230static int __init pcsp_init(void)
231{
232 return platform_driver_register(&pcsp_platform_driver);
233}
234
235static void __exit pcsp_exit(void)
236{
237 platform_driver_unregister(&pcsp_platform_driver);
238}
239
240module_init(pcsp_init);
241module_exit(pcsp_exit);