xref: /openbmc/linux/sound/drivers/pcsp/pcsp.c (revision 22246614)
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 #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 int enable = SNDRV_DEFAULT_ENABLE1;	/* Enable this card */
29 
30 module_param(index, int, 0444);
31 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
32 module_param(id, charp, 0444);
33 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
34 module_param(enable, bool, 0444);
35 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
36 
37 struct snd_pcsp pcsp_chip;
38 
39 static int __devinit snd_pcsp_create(struct snd_card *card)
40 {
41 	static struct snd_device_ops ops = { };
42 	struct timespec tp;
43 	int err;
44 	int div, min_div, order;
45 
46 	hrtimer_get_res(CLOCK_MONOTONIC, &tp);
47 	if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
48 		printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
49 		       "(%linS)\n", tp.tv_nsec);
50 		printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
51 		       "enabled.\n");
52 		return -EIO;
53 	}
54 
55 	if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
56 		min_div = MIN_DIV;
57 	else
58 		min_div = MAX_DIV;
59 #if PCSP_DEBUG
60 	printk("PCSP: lpj=%li, min_div=%i, res=%li\n",
61 	       loops_per_jiffy, min_div, tp.tv_nsec);
62 #endif
63 
64 	div = MAX_DIV / min_div;
65 	order = fls(div) - 1;
66 
67 	pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
68 	pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
69 	pcsp_chip.playback_ptr = 0;
70 	pcsp_chip.period_ptr = 0;
71 	atomic_set(&pcsp_chip.timer_active, 0);
72 	pcsp_chip.enable = 1;
73 	pcsp_chip.pcspkr = 1;
74 
75 	spin_lock_init(&pcsp_chip.substream_lock);
76 
77 	pcsp_chip.card = card;
78 	pcsp_chip.port = 0x61;
79 	pcsp_chip.irq = -1;
80 	pcsp_chip.dma = -1;
81 
82 	/* Register device */
83 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
84 	if (err < 0)
85 		return err;
86 
87 	return 0;
88 }
89 
90 static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
91 {
92 	struct snd_card *card;
93 	int err;
94 
95 	if (devnum != 0)
96 		return -EINVAL;
97 
98 	hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
99 	pcsp_chip.timer.cb_mode = HRTIMER_CB_IRQSAFE;
100 	pcsp_chip.timer.function = pcsp_do_timer;
101 
102 	card = snd_card_new(index, id, THIS_MODULE, 0);
103 	if (!card)
104 		return -ENOMEM;
105 
106 	err = snd_pcsp_create(card);
107 	if (err < 0) {
108 		snd_card_free(card);
109 		return err;
110 	}
111 	err = snd_pcsp_new_pcm(&pcsp_chip);
112 	if (err < 0) {
113 		snd_card_free(card);
114 		return err;
115 	}
116 	err = snd_pcsp_new_mixer(&pcsp_chip);
117 	if (err < 0) {
118 		snd_card_free(card);
119 		return err;
120 	}
121 
122 	snd_card_set_dev(pcsp_chip.card, dev);
123 
124 	strcpy(card->driver, "PC-Speaker");
125 	strcpy(card->shortname, "pcsp");
126 	sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
127 		pcsp_chip.port);
128 
129 	err = snd_card_register(card);
130 	if (err < 0) {
131 		snd_card_free(card);
132 		return err;
133 	}
134 
135 	return 0;
136 }
137 
138 static int __devinit alsa_card_pcsp_init(struct device *dev)
139 {
140 	int err;
141 
142 	err = snd_card_pcsp_probe(0, dev);
143 	if (err) {
144 		printk(KERN_ERR "PC-Speaker initialization failed.\n");
145 		return err;
146 	}
147 
148 #ifdef CONFIG_DEBUG_PAGEALLOC
149 	/* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
150 	printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
151 	       "which may make the sound noisy.\n");
152 #endif
153 
154 	return 0;
155 }
156 
157 static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
158 {
159 	snd_card_free(chip->card);
160 }
161 
162 static int __devinit pcsp_probe(struct platform_device *dev)
163 {
164 	int err;
165 
166 	err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
167 	if (err < 0)
168 		return err;
169 
170 	err = alsa_card_pcsp_init(&dev->dev);
171 	if (err < 0) {
172 		pcspkr_input_remove(pcsp_chip.input_dev);
173 		return err;
174 	}
175 
176 	platform_set_drvdata(dev, &pcsp_chip);
177 	return 0;
178 }
179 
180 static int __devexit pcsp_remove(struct platform_device *dev)
181 {
182 	struct snd_pcsp *chip = platform_get_drvdata(dev);
183 	alsa_card_pcsp_exit(chip);
184 	pcspkr_input_remove(chip->input_dev);
185 	platform_set_drvdata(dev, NULL);
186 	return 0;
187 }
188 
189 static void pcsp_stop_beep(struct snd_pcsp *chip)
190 {
191 	spin_lock_irq(&chip->substream_lock);
192 	if (!chip->playback_substream)
193 		pcspkr_stop_sound();
194 	spin_unlock_irq(&chip->substream_lock);
195 }
196 
197 #ifdef CONFIG_PM
198 static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
199 {
200 	struct snd_pcsp *chip = platform_get_drvdata(dev);
201 	pcsp_stop_beep(chip);
202 	snd_pcm_suspend_all(chip->pcm);
203 	return 0;
204 }
205 #else
206 #define pcsp_suspend NULL
207 #endif	/* CONFIG_PM */
208 
209 static void pcsp_shutdown(struct platform_device *dev)
210 {
211 	struct snd_pcsp *chip = platform_get_drvdata(dev);
212 	pcsp_stop_beep(chip);
213 }
214 
215 static struct platform_driver pcsp_platform_driver = {
216 	.driver		= {
217 		.name	= "pcspkr",
218 		.owner	= THIS_MODULE,
219 	},
220 	.probe		= pcsp_probe,
221 	.remove		= __devexit_p(pcsp_remove),
222 	.suspend	= pcsp_suspend,
223 	.shutdown	= pcsp_shutdown,
224 };
225 
226 static int __init pcsp_init(void)
227 {
228 	if (!enable)
229 		return -ENODEV;
230 	return platform_driver_register(&pcsp_platform_driver);
231 }
232 
233 static void __exit pcsp_exit(void)
234 {
235 	platform_driver_unregister(&pcsp_platform_driver);
236 }
237 
238 module_init(pcsp_init);
239 module_exit(pcsp_exit);
240