beep.c (7269B)
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Beep using pcm 4 * 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 running 32 */ 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 +327 44 * so we can multiply by an amplitude in the range 0..100 to get a 45 * 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 512 84#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 mixer 162 */ 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}