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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 <linux/bitops.h>
17#include <linux/mm.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;
28static char *id = SNDRV_DEFAULT_STR1;
29static bool enable = SNDRV_DEFAULT_ENABLE1;
30static bool nopcm;
31
32module_param(index, int, 0444);
33MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
34module_param(id, charp, 0444);
35MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
36module_param(enable, bool, 0444);
37MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
38module_param(nopcm, bool, 0444);
39MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
40
41struct snd_pcsp pcsp_chip;
42
43static int snd_pcsp_create(struct snd_card *card)
44{
45 static struct snd_device_ops ops = { };
46 unsigned int resolution = hrtimer_resolution;
47 int err, div, min_div, order;
48
49 if (!nopcm) {
50 if (resolution > PCSP_MAX_PERIOD_NS) {
51 printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
52 "(%unS)\n", resolution);
53 printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
54 "enabled.\n");
55 printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
56 nopcm = 1;
57 }
58 }
59
60 if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
61 min_div = MIN_DIV;
62 else
63 min_div = MAX_DIV;
64#if PCSP_DEBUG
65 printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
66 loops_per_jiffy, min_div, resolution);
67#endif
68
69 div = MAX_DIV / min_div;
70 order = fls(div) - 1;
71
72 pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
73 pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
74 pcsp_chip.playback_ptr = 0;
75 pcsp_chip.period_ptr = 0;
76 atomic_set(&pcsp_chip.timer_active, 0);
77 pcsp_chip.enable = 1;
78 pcsp_chip.pcspkr = 1;
79
80 spin_lock_init(&pcsp_chip.substream_lock);
81
82 pcsp_chip.card = card;
83 pcsp_chip.port = 0x61;
84 pcsp_chip.irq = -1;
85 pcsp_chip.dma = -1;
86
87
88 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
89 if (err < 0)
90 return err;
91
92 return 0;
93}
94
95static int snd_card_pcsp_probe(int devnum, struct device *dev)
96{
97 struct snd_card *card;
98 int err;
99
100 if (devnum != 0)
101 return -EINVAL;
102
103 hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
104 pcsp_chip.timer.function = pcsp_do_timer;
105
106 err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card);
107 if (err < 0)
108 return err;
109
110 err = snd_pcsp_create(card);
111 if (err < 0)
112 goto free_card;
113
114 if (!nopcm) {
115 err = snd_pcsp_new_pcm(&pcsp_chip);
116 if (err < 0)
117 goto free_card;
118 }
119 err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
120 if (err < 0)
121 goto free_card;
122
123 strcpy(card->driver, "PC-Speaker");
124 strcpy(card->shortname, "pcsp");
125 sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
126 pcsp_chip.port);
127
128 err = snd_card_register(card);
129 if (err < 0)
130 goto free_card;
131
132 return 0;
133
134free_card:
135 snd_card_free(card);
136 return err;
137}
138
139static int alsa_card_pcsp_init(struct device *dev)
140{
141 int err;
142
143 err = snd_card_pcsp_probe(0, dev);
144 if (err) {
145 printk(KERN_ERR "PC-Speaker initialization failed.\n");
146 return err;
147 }
148
149
150 if (debug_pagealloc_enabled()) {
151 printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
152 "which may make the sound noisy.\n");
153 }
154
155 return 0;
156}
157
158static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
159{
160 snd_card_free(chip->card);
161}
162
163static int pcsp_probe(struct platform_device *dev)
164{
165 int err;
166
167 err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
168 if (err < 0)
169 return err;
170
171 err = alsa_card_pcsp_init(&dev->dev);
172 if (err < 0) {
173 pcspkr_input_remove(pcsp_chip.input_dev);
174 return err;
175 }
176
177 platform_set_drvdata(dev, &pcsp_chip);
178 return 0;
179}
180
181static int pcsp_remove(struct platform_device *dev)
182{
183 struct snd_pcsp *chip = platform_get_drvdata(dev);
184 pcspkr_input_remove(chip->input_dev);
185 alsa_card_pcsp_exit(chip);
186 return 0;
187}
188
189static void pcsp_stop_beep(struct snd_pcsp *chip)
190{
191 pcsp_sync_stop(chip);
192 pcspkr_stop_sound();
193}
194
195#ifdef CONFIG_PM_SLEEP
196static int pcsp_suspend(struct device *dev)
197{
198 struct snd_pcsp *chip = dev_get_drvdata(dev);
199 pcsp_stop_beep(chip);
200 snd_pcm_suspend_all(chip->pcm);
201 return 0;
202}
203
204static SIMPLE_DEV_PM_OPS(pcsp_pm, pcsp_suspend, NULL);
205#define PCSP_PM_OPS &pcsp_pm
206#else
207#define PCSP_PM_OPS NULL
208#endif
209
210static void pcsp_shutdown(struct platform_device *dev)
211{
212 struct snd_pcsp *chip = platform_get_drvdata(dev);
213 pcsp_stop_beep(chip);
214}
215
216static struct platform_driver pcsp_platform_driver = {
217 .driver = {
218 .name = "pcspkr",
219 .pm = PCSP_PM_OPS,
220 },
221 .probe = pcsp_probe,
222 .remove = pcsp_remove,
223 .shutdown = pcsp_shutdown,
224};
225
226static int __init pcsp_init(void)
227{
228 if (!enable)
229 return -ENODEV;
230 return platform_driver_register(&pcsp_platform_driver);
231}
232
233static void __exit pcsp_exit(void)
234{
235 platform_driver_unregister(&pcsp_platform_driver);
236}
237
238module_init(pcsp_init);
239module_exit(pcsp_exit);
240
