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1da177e4 LT |
1 | /* |
2 | * Beep using pcm | |
3 | * | |
4 | * Copyright (c) by Takashi Iwai <tiwai@suse.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <sound/driver.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/irq.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/input.h> | |
27 | #include <sound/core.h> | |
28 | #include <sound/control.h> | |
29 | #include "pmac.h" | |
30 | ||
31 | struct snd_pmac_beep { | |
32 | int running; /* boolean */ | |
33 | int volume; /* mixer volume: 0-100 */ | |
34 | int volume_play; /* currently playing volume */ | |
35 | int hz; | |
36 | int nsamples; | |
37 | short *buf; /* allocated wave buffer */ | |
38 | unsigned long addr; /* physical address of buffer */ | |
39 | struct input_dev dev; | |
40 | }; | |
41 | ||
42 | /* | |
43 | * stop beep if running | |
44 | */ | |
45 | void snd_pmac_beep_stop(pmac_t *chip) | |
46 | { | |
47 | pmac_beep_t *beep = chip->beep; | |
48 | if (beep && beep->running) { | |
49 | beep->running = 0; | |
50 | snd_pmac_beep_dma_stop(chip); | |
51 | } | |
52 | } | |
53 | ||
54 | /* | |
55 | * Stuff for outputting a beep. The values range from -327 to +327 | |
56 | * so we can multiply by an amplitude in the range 0..100 to get a | |
57 | * signed short value to put in the output buffer. | |
58 | */ | |
59 | static short beep_wform[256] = { | |
60 | 0, 40, 79, 117, 153, 187, 218, 245, | |
61 | 269, 288, 304, 316, 323, 327, 327, 324, | |
62 | 318, 310, 299, 288, 275, 262, 249, 236, | |
63 | 224, 213, 204, 196, 190, 186, 183, 182, | |
64 | 182, 183, 186, 189, 192, 196, 200, 203, | |
65 | 206, 208, 209, 209, 209, 207, 204, 201, | |
66 | 197, 193, 188, 183, 179, 174, 170, 166, | |
67 | 163, 161, 160, 159, 159, 160, 161, 162, | |
68 | 164, 166, 168, 169, 171, 171, 171, 170, | |
69 | 169, 167, 163, 159, 155, 150, 144, 139, | |
70 | 133, 128, 122, 117, 113, 110, 107, 105, | |
71 | 103, 103, 103, 103, 104, 104, 105, 105, | |
72 | 105, 103, 101, 97, 92, 86, 78, 68, | |
73 | 58, 45, 32, 18, 3, -11, -26, -41, | |
74 | -55, -68, -79, -88, -95, -100, -102, -102, | |
75 | -99, -93, -85, -75, -62, -48, -33, -16, | |
76 | 0, 16, 33, 48, 62, 75, 85, 93, | |
77 | 99, 102, 102, 100, 95, 88, 79, 68, | |
78 | 55, 41, 26, 11, -3, -18, -32, -45, | |
79 | -58, -68, -78, -86, -92, -97, -101, -103, | |
80 | -105, -105, -105, -104, -104, -103, -103, -103, | |
81 | -103, -105, -107, -110, -113, -117, -122, -128, | |
82 | -133, -139, -144, -150, -155, -159, -163, -167, | |
83 | -169, -170, -171, -171, -171, -169, -168, -166, | |
84 | -164, -162, -161, -160, -159, -159, -160, -161, | |
85 | -163, -166, -170, -174, -179, -183, -188, -193, | |
86 | -197, -201, -204, -207, -209, -209, -209, -208, | |
87 | -206, -203, -200, -196, -192, -189, -186, -183, | |
88 | -182, -182, -183, -186, -190, -196, -204, -213, | |
89 | -224, -236, -249, -262, -275, -288, -299, -310, | |
90 | -318, -324, -327, -327, -323, -316, -304, -288, | |
91 | -269, -245, -218, -187, -153, -117, -79, -40, | |
92 | }; | |
93 | ||
94 | #define BEEP_SRATE 22050 /* 22050 Hz sample rate */ | |
95 | #define BEEP_BUFLEN 512 | |
96 | #define BEEP_VOLUME 15 /* 0 - 100 */ | |
97 | ||
98 | static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type, unsigned int code, int hz) | |
99 | { | |
100 | pmac_t *chip; | |
101 | pmac_beep_t *beep; | |
102 | unsigned long flags; | |
103 | int beep_speed = 0; | |
104 | int srate; | |
105 | int period, ncycles, nsamples; | |
106 | int i, j, f; | |
107 | short *p; | |
108 | ||
109 | if (type != EV_SND) | |
110 | return -1; | |
111 | ||
112 | switch (code) { | |
113 | case SND_BELL: if (hz) hz = 1000; | |
114 | case SND_TONE: break; | |
115 | default: return -1; | |
116 | } | |
117 | ||
118 | chip = dev->private; | |
119 | if (! chip || (beep = chip->beep) == NULL) | |
120 | return -1; | |
121 | ||
122 | if (! hz) { | |
123 | spin_lock_irqsave(&chip->reg_lock, flags); | |
124 | if (beep->running) | |
125 | snd_pmac_beep_stop(chip); | |
126 | spin_unlock_irqrestore(&chip->reg_lock, flags); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE); | |
131 | srate = chip->freq_table[beep_speed]; | |
132 | ||
133 | if (hz <= srate / BEEP_BUFLEN || hz > srate / 2) | |
134 | hz = 1000; | |
135 | ||
136 | spin_lock_irqsave(&chip->reg_lock, flags); | |
137 | if (chip->playback.running || chip->capture.running || beep->running) { | |
138 | spin_unlock_irqrestore(&chip->reg_lock, flags); | |
139 | return 0; | |
140 | } | |
141 | beep->running = 1; | |
142 | spin_unlock_irqrestore(&chip->reg_lock, flags); | |
143 | ||
144 | if (hz == beep->hz && beep->volume == beep->volume_play) { | |
145 | nsamples = beep->nsamples; | |
146 | } else { | |
147 | period = srate * 256 / hz; /* fixed point */ | |
148 | ncycles = BEEP_BUFLEN * 256 / period; | |
149 | nsamples = (period * ncycles) >> 8; | |
150 | f = ncycles * 65536 / nsamples; | |
151 | j = 0; | |
152 | p = beep->buf; | |
153 | for (i = 0; i < nsamples; ++i, p += 2) { | |
154 | p[0] = p[1] = beep_wform[j >> 8] * beep->volume; | |
155 | j = (j + f) & 0xffff; | |
156 | } | |
157 | beep->hz = hz; | |
158 | beep->volume_play = beep->volume; | |
159 | beep->nsamples = nsamples; | |
160 | } | |
161 | ||
162 | spin_lock_irqsave(&chip->reg_lock, flags); | |
163 | snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed); | |
164 | spin_unlock_irqrestore(&chip->reg_lock, flags); | |
165 | return 0; | |
166 | } | |
167 | ||
168 | /* | |
169 | * beep volume mixer | |
170 | */ | |
171 | ||
172 | #define chip_t pmac_t | |
173 | ||
174 | static int snd_pmac_info_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo) | |
175 | { | |
176 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
177 | uinfo->count = 1; | |
178 | uinfo->value.integer.min = 0; | |
179 | uinfo->value.integer.max = 100; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int snd_pmac_get_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol) | |
184 | { | |
185 | pmac_t *chip = snd_kcontrol_chip(kcontrol); | |
186 | snd_assert(chip->beep, return -ENXIO); | |
187 | ucontrol->value.integer.value[0] = chip->beep->volume; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int snd_pmac_put_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol) | |
192 | { | |
193 | pmac_t *chip = snd_kcontrol_chip(kcontrol); | |
194 | int oval; | |
195 | snd_assert(chip->beep, return -ENXIO); | |
196 | oval = chip->beep->volume; | |
197 | chip->beep->volume = ucontrol->value.integer.value[0]; | |
198 | return oval != chip->beep->volume; | |
199 | } | |
200 | ||
201 | static snd_kcontrol_new_t snd_pmac_beep_mixer = { | |
202 | .iface = SNDRV_CTL_ELEM_IFACE_MIXER, | |
203 | .name = "Beep Playback Volume", | |
204 | .info = snd_pmac_info_beep, | |
205 | .get = snd_pmac_get_beep, | |
206 | .put = snd_pmac_put_beep, | |
207 | }; | |
208 | ||
209 | /* Initialize beep stuff */ | |
210 | int __init snd_pmac_attach_beep(pmac_t *chip) | |
211 | { | |
212 | pmac_beep_t *beep; | |
213 | int err; | |
214 | ||
215 | beep = kmalloc(sizeof(*beep), GFP_KERNEL); | |
216 | if (! beep) | |
217 | return -ENOMEM; | |
218 | ||
219 | memset(beep, 0, sizeof(*beep)); | |
220 | beep->buf = (short *) kmalloc(BEEP_BUFLEN * 4, GFP_KERNEL); | |
221 | if (! beep->buf) { | |
222 | kfree(beep); | |
223 | return -ENOMEM; | |
224 | } | |
225 | beep->addr = virt_to_bus(beep->buf); | |
226 | ||
227 | beep->dev.evbit[0] = BIT(EV_SND); | |
228 | beep->dev.sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); | |
229 | beep->dev.event = snd_pmac_beep_event; | |
230 | beep->dev.private = chip; | |
231 | ||
232 | /* FIXME: set more better values */ | |
233 | beep->dev.name = "PowerMac Beep"; | |
234 | beep->dev.phys = "powermac/beep"; | |
235 | beep->dev.id.bustype = BUS_ADB; | |
236 | beep->dev.id.vendor = 0x001f; | |
237 | beep->dev.id.product = 0x0001; | |
238 | beep->dev.id.version = 0x0100; | |
239 | ||
240 | beep->volume = BEEP_VOLUME; | |
241 | beep->running = 0; | |
242 | if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_pmac_beep_mixer, chip))) < 0) { | |
243 | kfree(beep->buf); | |
244 | kfree(beep); | |
245 | return err; | |
246 | } | |
247 | ||
248 | chip->beep = beep; | |
249 | input_register_device(&beep->dev); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | void snd_pmac_detach_beep(pmac_t *chip) | |
255 | { | |
256 | if (chip->beep) { | |
257 | input_unregister_device(&chip->beep->dev); | |
258 | kfree(chip->beep->buf); | |
259 | kfree(chip->beep); | |
260 | chip->beep = NULL; | |
261 | } | |
262 | } |