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272 lines
7.1 KiB
272 lines
7.1 KiB
// 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 <[email protected]> |
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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 || (beep = chip->beep) == NULL) |
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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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