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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 <asm/io.h> |
22 | #include <asm/irq.h> |
23 | #include <linux/init.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/input.h> |
26 | #include <linux/pci.h> |
27 | #include <linux/dma-mapping.h> |
28 | #include <sound/core.h> |
29 | #include <sound/control.h> |
30 | #include "pmac.h" |
31 | |
32 | struct pmac_beep { |
33 | int running; /* boolean */ |
34 | int volume; /* mixer volume: 0-100 */ |
35 | int volume_play; /* currently playing volume */ |
36 | int hz; |
37 | int nsamples; |
38 | short *buf; /* allocated wave buffer */ |
39 | dma_addr_t addr; /* physical address of buffer */ |
40 | struct input_dev *dev; |
41 | }; |
42 | |
43 | /* |
44 | * stop beep if running |
45 | */ |
46 | void snd_pmac_beep_stop(struct snd_pmac *chip) |
47 | { |
48 | struct pmac_beep *beep = chip->beep; |
49 | if (beep && beep->running) { |
50 | beep->running = 0; |
51 | snd_pmac_beep_dma_stop(chip); |
52 | } |
53 | } |
54 | |
55 | /* |
56 | * Stuff for outputting a beep. The values range from -327 to +327 |
57 | * so we can multiply by an amplitude in the range 0..100 to get a |
58 | * signed short value to put in the output buffer. |
59 | */ |
60 | static short beep_wform[256] = { |
61 | 0, 40, 79, 117, 153, 187, 218, 245, |
62 | 269, 288, 304, 316, 323, 327, 327, 324, |
63 | 318, 310, 299, 288, 275, 262, 249, 236, |
64 | 224, 213, 204, 196, 190, 186, 183, 182, |
65 | 182, 183, 186, 189, 192, 196, 200, 203, |
66 | 206, 208, 209, 209, 209, 207, 204, 201, |
67 | 197, 193, 188, 183, 179, 174, 170, 166, |
68 | 163, 161, 160, 159, 159, 160, 161, 162, |
69 | 164, 166, 168, 169, 171, 171, 171, 170, |
70 | 169, 167, 163, 159, 155, 150, 144, 139, |
71 | 133, 128, 122, 117, 113, 110, 107, 105, |
72 | 103, 103, 103, 103, 104, 104, 105, 105, |
73 | 105, 103, 101, 97, 92, 86, 78, 68, |
74 | 58, 45, 32, 18, 3, -11, -26, -41, |
75 | -55, -68, -79, -88, -95, -100, -102, -102, |
76 | -99, -93, -85, -75, -62, -48, -33, -16, |
77 | 0, 16, 33, 48, 62, 75, 85, 93, |
78 | 99, 102, 102, 100, 95, 88, 79, 68, |
79 | 55, 41, 26, 11, -3, -18, -32, -45, |
80 | -58, -68, -78, -86, -92, -97, -101, -103, |
81 | -105, -105, -105, -104, -104, -103, -103, -103, |
82 | -103, -105, -107, -110, -113, -117, -122, -128, |
83 | -133, -139, -144, -150, -155, -159, -163, -167, |
84 | -169, -170, -171, -171, -171, -169, -168, -166, |
85 | -164, -162, -161, -160, -159, -159, -160, -161, |
86 | -163, -166, -170, -174, -179, -183, -188, -193, |
87 | -197, -201, -204, -207, -209, -209, -209, -208, |
88 | -206, -203, -200, -196, -192, -189, -186, -183, |
89 | -182, -182, -183, -186, -190, -196, -204, -213, |
90 | -224, -236, -249, -262, -275, -288, -299, -310, |
91 | -318, -324, -327, -327, -323, -316, -304, -288, |
92 | -269, -245, -218, -187, -153, -117, -79, -40, |
93 | }; |
94 | |
95 | #define BEEP_SRATE 22050 /* 22050 Hz sample rate */ |
96 | #define BEEP_BUFLEN 512 |
97 | #define BEEP_VOLUME 15 /* 0 - 100 */ |
98 | |
99 | static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type, |
100 | unsigned int code, int hz) |
101 | { |
102 | struct snd_pmac *chip; |
103 | struct pmac_beep *beep; |
104 | unsigned long flags; |
105 | int beep_speed = 0; |
106 | int srate; |
107 | int period, ncycles, nsamples; |
108 | int i, j, f; |
109 | short *p; |
110 | |
111 | if (type != EV_SND) |
112 | return -1; |
113 | |
114 | switch (code) { |
115 | case SND_BELL: if (hz) hz = 1000; |
116 | case SND_TONE: break; |
117 | default: return -1; |
118 | } |
119 | |
120 | chip = input_get_drvdata(dev); |
121 | if (! chip || (beep = chip->beep) == NULL) |
122 | return -1; |
123 | |
124 | if (! hz) { |
125 | spin_lock_irqsave(&chip->reg_lock, flags); |
126 | if (beep->running) |
127 | snd_pmac_beep_stop(chip); |
128 | spin_unlock_irqrestore(&chip->reg_lock, flags); |
129 | return 0; |
130 | } |
131 | |
132 | beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE); |
133 | srate = chip->freq_table[beep_speed]; |
134 | |
135 | if (hz <= srate / BEEP_BUFLEN || hz > srate / 2) |
136 | hz = 1000; |
137 | |
138 | spin_lock_irqsave(&chip->reg_lock, flags); |
139 | if (chip->playback.running || chip->capture.running || beep->running) { |
140 | spin_unlock_irqrestore(&chip->reg_lock, flags); |
141 | return 0; |
142 | } |
143 | beep->running = 1; |
144 | spin_unlock_irqrestore(&chip->reg_lock, flags); |
145 | |
146 | if (hz == beep->hz && beep->volume == beep->volume_play) { |
147 | nsamples = beep->nsamples; |
148 | } else { |
149 | period = srate * 256 / hz; /* fixed point */ |
150 | ncycles = BEEP_BUFLEN * 256 / period; |
151 | nsamples = (period * ncycles) >> 8; |
152 | f = ncycles * 65536 / nsamples; |
153 | j = 0; |
154 | p = beep->buf; |
155 | for (i = 0; i < nsamples; ++i, p += 2) { |
156 | p[0] = p[1] = beep_wform[j >> 8] * beep->volume; |
157 | j = (j + f) & 0xffff; |
158 | } |
159 | beep->hz = hz; |
160 | beep->volume_play = beep->volume; |
161 | beep->nsamples = nsamples; |
162 | } |
163 | |
164 | spin_lock_irqsave(&chip->reg_lock, flags); |
165 | snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed); |
166 | spin_unlock_irqrestore(&chip->reg_lock, flags); |
167 | return 0; |
168 | } |
169 | |
170 | /* |
171 | * beep volume mixer |
172 | */ |
173 | |
174 | static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol, |
175 | struct snd_ctl_elem_info *uinfo) |
176 | { |
177 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
178 | uinfo->count = 1; |
179 | uinfo->value.integer.min = 0; |
180 | uinfo->value.integer.max = 100; |
181 | return 0; |
182 | } |
183 | |
184 | static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol, |
185 | struct snd_ctl_elem_value *ucontrol) |
186 | { |
187 | struct snd_pmac *chip = snd_kcontrol_chip(kcontrol); |
188 | if (snd_BUG_ON(!chip->beep)) |
189 | return -ENXIO; |
190 | ucontrol->value.integer.value[0] = chip->beep->volume; |
191 | return 0; |
192 | } |
193 | |
194 | static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol, |
195 | struct snd_ctl_elem_value *ucontrol) |
196 | { |
197 | struct snd_pmac *chip = snd_kcontrol_chip(kcontrol); |
198 | unsigned int oval, nval; |
199 | if (snd_BUG_ON(!chip->beep)) |
200 | return -ENXIO; |
201 | oval = chip->beep->volume; |
202 | nval = ucontrol->value.integer.value[0]; |
203 | if (nval > 100) |
204 | return -EINVAL; |
205 | chip->beep->volume = nval; |
206 | return oval != chip->beep->volume; |
207 | } |
208 | |
209 | static struct snd_kcontrol_new snd_pmac_beep_mixer = { |
210 | .iface = SNDRV_CTL_ELEM_IFACE_MIXER, |
211 | .name = "Beep Playback Volume", |
212 | .info = snd_pmac_info_beep, |
213 | .get = snd_pmac_get_beep, |
214 | .put = snd_pmac_put_beep, |
215 | }; |
216 | |
217 | /* Initialize beep stuff */ |
218 | int __devinit snd_pmac_attach_beep(struct snd_pmac *chip) |
219 | { |
220 | struct pmac_beep *beep; |
221 | struct input_dev *input_dev; |
222 | struct snd_kcontrol *beep_ctl; |
223 | void *dmabuf; |
224 | int err = -ENOMEM; |
225 | |
226 | beep = kzalloc(sizeof(*beep), GFP_KERNEL); |
227 | if (! beep) |
228 | return -ENOMEM; |
229 | dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, |
230 | &beep->addr, GFP_KERNEL); |
231 | input_dev = input_allocate_device(); |
232 | if (! dmabuf || ! input_dev) |
233 | goto fail1; |
234 | |
235 | /* FIXME: set more better values */ |
236 | input_dev->name = "PowerMac Beep"; |
237 | input_dev->phys = "powermac/beep"; |
238 | input_dev->id.bustype = BUS_ADB; |
239 | input_dev->id.vendor = 0x001f; |
240 | input_dev->id.product = 0x0001; |
241 | input_dev->id.version = 0x0100; |
242 | |
243 | input_dev->evbit[0] = BIT_MASK(EV_SND); |
244 | input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); |
245 | input_dev->event = snd_pmac_beep_event; |
246 | input_dev->dev.parent = &chip->pdev->dev; |
247 | input_set_drvdata(input_dev, chip); |
248 | |
249 | beep->dev = input_dev; |
250 | beep->buf = dmabuf; |
251 | beep->volume = BEEP_VOLUME; |
252 | beep->running = 0; |
253 | |
254 | beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip); |
255 | err = snd_ctl_add(chip->card, beep_ctl); |
256 | if (err < 0) |
257 | goto fail1; |
258 | |
259 | chip->beep = beep; |
260 | |
261 | err = input_register_device(beep->dev); |
262 | if (err) |
263 | goto fail2; |
264 | |
265 | return 0; |
266 | |
267 | fail2: snd_ctl_remove(chip->card, beep_ctl); |
268 | fail1: input_free_device(input_dev); |
269 | if (dmabuf) |
270 | dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, |
271 | dmabuf, beep->addr); |
272 | kfree(beep); |
273 | return err; |
274 | } |
275 | |
276 | void snd_pmac_detach_beep(struct snd_pmac *chip) |
277 | { |
278 | if (chip->beep) { |
279 | input_unregister_device(chip->beep->dev); |
280 | dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, |
281 | chip->beep->buf, chip->beep->addr); |
282 | kfree(chip->beep); |
283 | chip->beep = NULL; |
284 | } |
285 | } |
286 |
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