87219bf0a35e8918a66c15550f2a4d020fd39af1
[linux-2.6.git] / 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/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         pcsp_sync_stop(chip);
192         pcspkr_stop_sound();
193 }
194
195 #ifdef CONFIG_PM
196 static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
197 {
198         struct snd_pcsp *chip = platform_get_drvdata(dev);
199         pcsp_stop_beep(chip);
200         snd_pcm_suspend_all(chip->pcm);
201         return 0;
202 }
203 #else
204 #define pcsp_suspend NULL
205 #endif  /* CONFIG_PM */
206
207 static void pcsp_shutdown(struct platform_device *dev)
208 {
209         struct snd_pcsp *chip = platform_get_drvdata(dev);
210         pcsp_stop_beep(chip);
211 }
212
213 static struct platform_driver pcsp_platform_driver = {
214         .driver         = {
215                 .name   = "pcspkr",
216                 .owner  = THIS_MODULE,
217         },
218         .probe          = pcsp_probe,
219         .remove         = __devexit_p(pcsp_remove),
220         .suspend        = pcsp_suspend,
221         .shutdown       = pcsp_shutdown,
222 };
223
224 static int __init pcsp_init(void)
225 {
226         if (!enable)
227                 return -ENODEV;
228         return platform_driver_register(&pcsp_platform_driver);
229 }
230
231 static void __exit pcsp_exit(void)
232 {
233         platform_driver_unregister(&pcsp_platform_driver);
234 }
235
236 module_init(pcsp_init);
237 module_exit(pcsp_exit);