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