tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
20MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
21MODULE_DESCRIPTION("PC-Speaker driver");
22MODULE_LICENSE("GPL");
23MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
24MODULE_ALIAS("platform:pcspkr");
25
26static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */
27static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */
28static bool enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */
29static bool nopcm; /* Disable PCM capability of the driver */
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, "Enable PC-Speaker sound.");
37module_param(nopcm, bool, 0444);
38MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
39
40struct snd_pcsp pcsp_chip;
41
42static 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
96static 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
145static 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
164static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
165{
166 snd_card_free(chip->card);
167}
168
169static 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
187static 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
196static 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
203static 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
211static 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
217static void pcsp_shutdown(struct platform_device *dev)
218{
219 struct snd_pcsp *chip = platform_get_drvdata(dev);
220 pcsp_stop_beep(chip);
221}
222
223static 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
234static int __init pcsp_init(void)
235{
236 if (!enable)
237 return -ENODEV;
238 return platform_driver_register(&pcsp_platform_driver);
239}
240
241static void __exit pcsp_exit(void)
242{
243 platform_driver_unregister(&pcsp_platform_driver);
244}
245
246module_init(pcsp_init);
247module_exit(pcsp_exit);