276 lines
7.1 KiB
C
276 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Beep using pcm
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*
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*/
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include "pmac.h"
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struct pmac_beep {
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int running; /* boolean */
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int volume; /* mixer volume: 0-100 */
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int volume_play; /* currently playing volume */
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int hz;
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int nsamples;
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short *buf; /* allocated wave buffer */
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dma_addr_t addr; /* physical address of buffer */
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struct input_dev *dev;
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};
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/*
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* stop beep if running
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*/
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void snd_pmac_beep_stop(struct snd_pmac *chip)
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{
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struct pmac_beep *beep = chip->beep;
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if (beep && beep->running) {
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beep->running = 0;
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snd_pmac_beep_dma_stop(chip);
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}
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}
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/*
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* Stuff for outputting a beep. The values range from -327 to +327
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* so we can multiply by an amplitude in the range 0..100 to get a
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* signed short value to put in the output buffer.
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*/
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static const short beep_wform[256] = {
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0, 40, 79, 117, 153, 187, 218, 245,
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269, 288, 304, 316, 323, 327, 327, 324,
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318, 310, 299, 288, 275, 262, 249, 236,
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224, 213, 204, 196, 190, 186, 183, 182,
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182, 183, 186, 189, 192, 196, 200, 203,
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206, 208, 209, 209, 209, 207, 204, 201,
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197, 193, 188, 183, 179, 174, 170, 166,
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163, 161, 160, 159, 159, 160, 161, 162,
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164, 166, 168, 169, 171, 171, 171, 170,
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169, 167, 163, 159, 155, 150, 144, 139,
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133, 128, 122, 117, 113, 110, 107, 105,
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103, 103, 103, 103, 104, 104, 105, 105,
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105, 103, 101, 97, 92, 86, 78, 68,
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58, 45, 32, 18, 3, -11, -26, -41,
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-55, -68, -79, -88, -95, -100, -102, -102,
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-99, -93, -85, -75, -62, -48, -33, -16,
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0, 16, 33, 48, 62, 75, 85, 93,
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99, 102, 102, 100, 95, 88, 79, 68,
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55, 41, 26, 11, -3, -18, -32, -45,
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-58, -68, -78, -86, -92, -97, -101, -103,
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-105, -105, -105, -104, -104, -103, -103, -103,
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-103, -105, -107, -110, -113, -117, -122, -128,
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-133, -139, -144, -150, -155, -159, -163, -167,
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-169, -170, -171, -171, -171, -169, -168, -166,
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-164, -162, -161, -160, -159, -159, -160, -161,
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-163, -166, -170, -174, -179, -183, -188, -193,
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-197, -201, -204, -207, -209, -209, -209, -208,
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-206, -203, -200, -196, -192, -189, -186, -183,
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-182, -182, -183, -186, -190, -196, -204, -213,
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-224, -236, -249, -262, -275, -288, -299, -310,
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-318, -324, -327, -327, -323, -316, -304, -288,
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-269, -245, -218, -187, -153, -117, -79, -40,
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};
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#define BEEP_SRATE 22050 /* 22050 Hz sample rate */
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#define BEEP_BUFLEN 512
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#define BEEP_VOLUME 15 /* 0 - 100 */
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static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int hz)
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{
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struct snd_pmac *chip;
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struct pmac_beep *beep;
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unsigned long flags;
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int beep_speed = 0;
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int srate;
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int period, ncycles, nsamples;
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int i, j, f;
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short *p;
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if (type != EV_SND)
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return -1;
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switch (code) {
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case SND_BELL: if (hz) hz = 1000;
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case SND_TONE: break;
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default: return -1;
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}
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chip = input_get_drvdata(dev);
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if (!chip)
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return -1;
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beep = chip->beep;
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if (!beep)
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return -1;
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if (! hz) {
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spin_lock_irqsave(&chip->reg_lock, flags);
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if (beep->running)
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snd_pmac_beep_stop(chip);
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spin_unlock_irqrestore(&chip->reg_lock, flags);
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return 0;
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}
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beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);
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srate = chip->freq_table[beep_speed];
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if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
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hz = 1000;
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spin_lock_irqsave(&chip->reg_lock, flags);
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if (chip->playback.running || chip->capture.running || beep->running) {
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spin_unlock_irqrestore(&chip->reg_lock, flags);
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return 0;
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}
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beep->running = 1;
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spin_unlock_irqrestore(&chip->reg_lock, flags);
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if (hz == beep->hz && beep->volume == beep->volume_play) {
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nsamples = beep->nsamples;
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} else {
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period = srate * 256 / hz; /* fixed point */
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ncycles = BEEP_BUFLEN * 256 / period;
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nsamples = (period * ncycles) >> 8;
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f = ncycles * 65536 / nsamples;
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j = 0;
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p = beep->buf;
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for (i = 0; i < nsamples; ++i, p += 2) {
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p[0] = p[1] = beep_wform[j >> 8] * beep->volume;
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j = (j + f) & 0xffff;
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}
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beep->hz = hz;
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beep->volume_play = beep->volume;
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beep->nsamples = nsamples;
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}
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spin_lock_irqsave(&chip->reg_lock, flags);
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snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);
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spin_unlock_irqrestore(&chip->reg_lock, flags);
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return 0;
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}
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/*
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* beep volume mixer
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*/
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static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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uinfo->count = 1;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = 100;
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return 0;
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}
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static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
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if (snd_BUG_ON(!chip->beep))
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return -ENXIO;
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ucontrol->value.integer.value[0] = chip->beep->volume;
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return 0;
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}
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static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
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unsigned int oval, nval;
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if (snd_BUG_ON(!chip->beep))
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return -ENXIO;
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oval = chip->beep->volume;
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nval = ucontrol->value.integer.value[0];
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if (nval > 100)
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return -EINVAL;
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chip->beep->volume = nval;
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return oval != chip->beep->volume;
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}
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static const struct snd_kcontrol_new snd_pmac_beep_mixer = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.name = "Beep Playback Volume",
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.info = snd_pmac_info_beep,
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.get = snd_pmac_get_beep,
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.put = snd_pmac_put_beep,
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};
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/* Initialize beep stuff */
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int snd_pmac_attach_beep(struct snd_pmac *chip)
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{
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struct pmac_beep *beep;
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struct input_dev *input_dev;
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struct snd_kcontrol *beep_ctl;
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void *dmabuf;
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int err = -ENOMEM;
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beep = kzalloc(sizeof(*beep), GFP_KERNEL);
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if (! beep)
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return -ENOMEM;
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dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
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&beep->addr, GFP_KERNEL);
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input_dev = input_allocate_device();
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if (! dmabuf || ! input_dev)
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goto fail1;
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/* FIXME: set more better values */
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input_dev->name = "PowerMac Beep";
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input_dev->phys = "powermac/beep";
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input_dev->id.bustype = BUS_ADB;
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input_dev->id.vendor = 0x001f;
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input_dev->id.product = 0x0001;
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input_dev->id.version = 0x0100;
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input_dev->evbit[0] = BIT_MASK(EV_SND);
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input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
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input_dev->event = snd_pmac_beep_event;
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input_dev->dev.parent = &chip->pdev->dev;
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input_set_drvdata(input_dev, chip);
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beep->dev = input_dev;
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beep->buf = dmabuf;
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beep->volume = BEEP_VOLUME;
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beep->running = 0;
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beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);
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err = snd_ctl_add(chip->card, beep_ctl);
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if (err < 0)
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goto fail1;
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chip->beep = beep;
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err = input_register_device(beep->dev);
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if (err)
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goto fail2;
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return 0;
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fail2: snd_ctl_remove(chip->card, beep_ctl);
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fail1: input_free_device(input_dev);
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if (dmabuf)
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dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
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dmabuf, beep->addr);
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kfree(beep);
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return err;
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}
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void snd_pmac_detach_beep(struct snd_pmac *chip)
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{
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if (chip->beep) {
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input_unregister_device(chip->beep->dev);
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dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
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chip->beep->buf, chip->beep->addr);
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kfree(chip->beep);
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chip->beep = NULL;
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}
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}
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