Root/sound/ppc/beep.c

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
32struct 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 */
46void 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 */
60static 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
99static 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
174static 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
184static 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
194static 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
209static 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 */
218int __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
276void 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

Archive Download this file



interactive