276 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Beep using pcm4 *5 * Copyright (c) by Takashi Iwai <tiwai@suse.de>6 */7 8#include <linux/io.h>9#include <asm/irq.h>10#include <linux/init.h>11#include <linux/slab.h>12#include <linux/input.h>13#include <linux/pci.h>14#include <linux/dma-mapping.h>15#include <sound/core.h>16#include <sound/control.h>17#include "pmac.h"18 19struct pmac_beep {20 int running; /* boolean */21 int volume; /* mixer volume: 0-100 */22 int volume_play; /* currently playing volume */23 int hz;24 int nsamples;25 short *buf; /* allocated wave buffer */26 dma_addr_t addr; /* physical address of buffer */27 struct input_dev *dev;28};29 30/*31 * stop beep if running32 */33void snd_pmac_beep_stop(struct snd_pmac *chip)34{35 struct pmac_beep *beep = chip->beep;36 if (beep && beep->running) {37 beep->running = 0;38 snd_pmac_beep_dma_stop(chip);39 }40}41 42/*43 * Stuff for outputting a beep. The values range from -327 to +32744 * so we can multiply by an amplitude in the range 0..100 to get a45 * signed short value to put in the output buffer.46 */47static const short beep_wform[256] = {48 0, 40, 79, 117, 153, 187, 218, 245,49 269, 288, 304, 316, 323, 327, 327, 324,50 318, 310, 299, 288, 275, 262, 249, 236,51 224, 213, 204, 196, 190, 186, 183, 182,52 182, 183, 186, 189, 192, 196, 200, 203,53 206, 208, 209, 209, 209, 207, 204, 201,54 197, 193, 188, 183, 179, 174, 170, 166,55 163, 161, 160, 159, 159, 160, 161, 162,56 164, 166, 168, 169, 171, 171, 171, 170,57 169, 167, 163, 159, 155, 150, 144, 139,58 133, 128, 122, 117, 113, 110, 107, 105,59 103, 103, 103, 103, 104, 104, 105, 105,60 105, 103, 101, 97, 92, 86, 78, 68,61 58, 45, 32, 18, 3, -11, -26, -41,62 -55, -68, -79, -88, -95, -100, -102, -102,63 -99, -93, -85, -75, -62, -48, -33, -16,64 0, 16, 33, 48, 62, 75, 85, 93,65 99, 102, 102, 100, 95, 88, 79, 68,66 55, 41, 26, 11, -3, -18, -32, -45,67 -58, -68, -78, -86, -92, -97, -101, -103,68 -105, -105, -105, -104, -104, -103, -103, -103,69 -103, -105, -107, -110, -113, -117, -122, -128,70 -133, -139, -144, -150, -155, -159, -163, -167,71 -169, -170, -171, -171, -171, -169, -168, -166,72 -164, -162, -161, -160, -159, -159, -160, -161,73 -163, -166, -170, -174, -179, -183, -188, -193,74 -197, -201, -204, -207, -209, -209, -209, -208,75 -206, -203, -200, -196, -192, -189, -186, -183,76 -182, -182, -183, -186, -190, -196, -204, -213,77 -224, -236, -249, -262, -275, -288, -299, -310,78 -318, -324, -327, -327, -323, -316, -304, -288,79 -269, -245, -218, -187, -153, -117, -79, -40,80};81 82#define BEEP_SRATE 22050 /* 22050 Hz sample rate */83#define BEEP_BUFLEN 51284#define BEEP_VOLUME 15 /* 0 - 100 */85 86static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type,87 unsigned int code, int hz)88{89 struct snd_pmac *chip;90 struct pmac_beep *beep;91 unsigned long flags;92 int beep_speed = 0;93 int srate;94 int period, ncycles, nsamples;95 int i, j, f;96 short *p;97 98 if (type != EV_SND)99 return -1;100 101 switch (code) {102 case SND_BELL: if (hz) hz = 1000; break;103 case SND_TONE: break;104 default: return -1;105 }106 107 chip = input_get_drvdata(dev);108 if (!chip)109 return -1;110 beep = chip->beep;111 if (!beep)112 return -1;113 114 if (! hz) {115 spin_lock_irqsave(&chip->reg_lock, flags);116 if (beep->running)117 snd_pmac_beep_stop(chip);118 spin_unlock_irqrestore(&chip->reg_lock, flags);119 return 0;120 }121 122 beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);123 srate = chip->freq_table[beep_speed];124 125 if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)126 hz = 1000;127 128 spin_lock_irqsave(&chip->reg_lock, flags);129 if (chip->playback.running || chip->capture.running || beep->running) {130 spin_unlock_irqrestore(&chip->reg_lock, flags);131 return 0;132 }133 beep->running = 1;134 spin_unlock_irqrestore(&chip->reg_lock, flags);135 136 if (hz == beep->hz && beep->volume == beep->volume_play) {137 nsamples = beep->nsamples;138 } else {139 period = srate * 256 / hz; /* fixed point */140 ncycles = BEEP_BUFLEN * 256 / period;141 nsamples = (period * ncycles) >> 8;142 f = ncycles * 65536 / nsamples;143 j = 0;144 p = beep->buf;145 for (i = 0; i < nsamples; ++i, p += 2) {146 p[0] = p[1] = beep_wform[j >> 8] * beep->volume;147 j = (j + f) & 0xffff;148 }149 beep->hz = hz;150 beep->volume_play = beep->volume;151 beep->nsamples = nsamples;152 }153 154 spin_lock_irqsave(&chip->reg_lock, flags);155 snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);156 spin_unlock_irqrestore(&chip->reg_lock, flags);157 return 0;158}159 160/*161 * beep volume mixer162 */163 164static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol,165 struct snd_ctl_elem_info *uinfo)166{167 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;168 uinfo->count = 1;169 uinfo->value.integer.min = 0;170 uinfo->value.integer.max = 100;171 return 0;172}173 174static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol,175 struct snd_ctl_elem_value *ucontrol)176{177 struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);178 if (snd_BUG_ON(!chip->beep))179 return -ENXIO;180 ucontrol->value.integer.value[0] = chip->beep->volume;181 return 0;182}183 184static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,185 struct snd_ctl_elem_value *ucontrol)186{187 struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);188 unsigned int oval, nval;189 if (snd_BUG_ON(!chip->beep))190 return -ENXIO;191 oval = chip->beep->volume;192 nval = ucontrol->value.integer.value[0];193 if (nval > 100)194 return -EINVAL;195 chip->beep->volume = nval;196 return oval != chip->beep->volume;197}198 199static const struct snd_kcontrol_new snd_pmac_beep_mixer = {200 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,201 .name = "Beep Playback Volume",202 .info = snd_pmac_info_beep,203 .get = snd_pmac_get_beep,204 .put = snd_pmac_put_beep,205};206 207/* Initialize beep stuff */208int snd_pmac_attach_beep(struct snd_pmac *chip)209{210 struct pmac_beep *beep;211 struct input_dev *input_dev;212 struct snd_kcontrol *beep_ctl;213 void *dmabuf;214 int err = -ENOMEM;215 216 beep = kzalloc(sizeof(*beep), GFP_KERNEL);217 if (! beep)218 return -ENOMEM;219 dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,220 &beep->addr, GFP_KERNEL);221 input_dev = input_allocate_device();222 if (! dmabuf || ! input_dev)223 goto fail1;224 225 /* FIXME: set more better values */226 input_dev->name = "PowerMac Beep";227 input_dev->phys = "powermac/beep";228 input_dev->id.bustype = BUS_ADB;229 input_dev->id.vendor = 0x001f;230 input_dev->id.product = 0x0001;231 input_dev->id.version = 0x0100;232 233 input_dev->evbit[0] = BIT_MASK(EV_SND);234 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);235 input_dev->event = snd_pmac_beep_event;236 input_dev->dev.parent = &chip->pdev->dev;237 input_set_drvdata(input_dev, chip);238 239 beep->dev = input_dev;240 beep->buf = dmabuf;241 beep->volume = BEEP_VOLUME;242 beep->running = 0;243 244 beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);245 err = snd_ctl_add(chip->card, beep_ctl);246 if (err < 0)247 goto fail1;248 249 chip->beep = beep;250 251 err = input_register_device(beep->dev);252 if (err)253 goto fail2;254 255 return 0;256 257 fail2: snd_ctl_remove(chip->card, beep_ctl);258 fail1: input_free_device(input_dev);259 if (dmabuf)260 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,261 dmabuf, beep->addr);262 kfree(beep);263 return err;264}265 266void snd_pmac_detach_beep(struct snd_pmac *chip)267{268 if (chip->beep) {269 input_unregister_device(chip->beep->dev);270 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,271 chip->beep->buf, chip->beep->addr);272 kfree(chip->beep);273 chip->beep = NULL;274 }275}276