xref: /openbmc/linux/sound/drivers/pcsp/pcsp.c (revision c819e2cf)
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 	hrtimer_get_res(CLOCK_MONOTONIC, &tp);
50 
51 	if (!nopcm) {
52 		if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
53 			printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
54 				"(%linS)\n", tp.tv_nsec);
55 			printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
56 				"enabled.\n");
57 			printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
58 			nopcm = 1;
59 		}
60 	}
61 
62 	if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
63 		min_div = MIN_DIV;
64 	else
65 		min_div = MAX_DIV;
66 #if PCSP_DEBUG
67 	printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%li\n",
68 	       loops_per_jiffy, min_div, tp.tv_nsec);
69 #endif
70 
71 	div = MAX_DIV / min_div;
72 	order = fls(div) - 1;
73 
74 	pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
75 	pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
76 	pcsp_chip.playback_ptr = 0;
77 	pcsp_chip.period_ptr = 0;
78 	atomic_set(&pcsp_chip.timer_active, 0);
79 	pcsp_chip.enable = 1;
80 	pcsp_chip.pcspkr = 1;
81 
82 	spin_lock_init(&pcsp_chip.substream_lock);
83 
84 	pcsp_chip.card = card;
85 	pcsp_chip.port = 0x61;
86 	pcsp_chip.irq = -1;
87 	pcsp_chip.dma = -1;
88 
89 	/* Register device */
90 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
91 	if (err < 0)
92 		return err;
93 
94 	return 0;
95 }
96 
97 static int snd_card_pcsp_probe(int devnum, struct device *dev)
98 {
99 	struct snd_card *card;
100 	int err;
101 
102 	if (devnum != 0)
103 		return -EINVAL;
104 
105 	hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
106 	pcsp_chip.timer.function = pcsp_do_timer;
107 
108 	err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card);
109 	if (err < 0)
110 		return err;
111 
112 	err = snd_pcsp_create(card);
113 	if (err < 0) {
114 		snd_card_free(card);
115 		return err;
116 	}
117 	if (!nopcm) {
118 		err = snd_pcsp_new_pcm(&pcsp_chip);
119 		if (err < 0) {
120 			snd_card_free(card);
121 			return err;
122 		}
123 	}
124 	err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
125 	if (err < 0) {
126 		snd_card_free(card);
127 		return err;
128 	}
129 
130 	strcpy(card->driver, "PC-Speaker");
131 	strcpy(card->shortname, "pcsp");
132 	sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
133 		pcsp_chip.port);
134 
135 	err = snd_card_register(card);
136 	if (err < 0) {
137 		snd_card_free(card);
138 		return err;
139 	}
140 
141 	return 0;
142 }
143 
144 static int alsa_card_pcsp_init(struct device *dev)
145 {
146 	int err;
147 
148 	err = snd_card_pcsp_probe(0, dev);
149 	if (err) {
150 		printk(KERN_ERR "PC-Speaker initialization failed.\n");
151 		return err;
152 	}
153 
154 #ifdef CONFIG_DEBUG_PAGEALLOC
155 	/* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
156 	printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
157 	       "which may make the sound noisy.\n");
158 #endif
159 
160 	return 0;
161 }
162 
163 static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
164 {
165 	snd_card_free(chip->card);
166 }
167 
168 static int pcsp_probe(struct platform_device *dev)
169 {
170 	int err;
171 
172 	err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
173 	if (err < 0)
174 		return err;
175 
176 	err = alsa_card_pcsp_init(&dev->dev);
177 	if (err < 0) {
178 		pcspkr_input_remove(pcsp_chip.input_dev);
179 		return err;
180 	}
181 
182 	platform_set_drvdata(dev, &pcsp_chip);
183 	return 0;
184 }
185 
186 static int pcsp_remove(struct platform_device *dev)
187 {
188 	struct snd_pcsp *chip = platform_get_drvdata(dev);
189 	pcspkr_input_remove(chip->input_dev);
190 	alsa_card_pcsp_exit(chip);
191 	return 0;
192 }
193 
194 static void pcsp_stop_beep(struct snd_pcsp *chip)
195 {
196 	pcsp_sync_stop(chip);
197 	pcspkr_stop_sound();
198 }
199 
200 #ifdef CONFIG_PM_SLEEP
201 static int pcsp_suspend(struct device *dev)
202 {
203 	struct snd_pcsp *chip = dev_get_drvdata(dev);
204 	pcsp_stop_beep(chip);
205 	snd_pcm_suspend_all(chip->pcm);
206 	return 0;
207 }
208 
209 static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
210 #define PCSP_PM_OPS	&pcsp_pm
211 #else
212 #define PCSP_PM_OPS	NULL
213 #endif	/* CONFIG_PM_SLEEP */
214 
215 static void pcsp_shutdown(struct platform_device *dev)
216 {
217 	struct snd_pcsp *chip = platform_get_drvdata(dev);
218 	pcsp_stop_beep(chip);
219 }
220 
221 static struct platform_driver pcsp_platform_driver = {
222 	.driver		= {
223 		.name	= "pcspkr",
224 		.pm	= PCSP_PM_OPS,
225 	},
226 	.probe		= pcsp_probe,
227 	.remove		= pcsp_remove,
228 	.shutdown	= pcsp_shutdown,
229 };
230 
231 static int __init pcsp_init(void)
232 {
233 	if (!enable)
234 		return -ENODEV;
235 	return platform_driver_register(&pcsp_platform_driver);
236 }
237 
238 static void __exit pcsp_exit(void)
239 {
240 	platform_driver_unregister(&pcsp_platform_driver);
241 }
242 
243 module_init(pcsp_init);
244 module_exit(pcsp_exit);
245