sound/ppc/beep.c

   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
  19 struct 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  */
  33 void 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  */
  47 static 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
  86 static 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;
 103         case SND_TONE: break;
 104         default: return -1;
 105         }
 106
 107         chip = input_get_drvdata(dev);
 108         if (! chip || (beep = chip->beep) == NULL)
 109                 return -1;
 110
 111         if (! hz) {
 112                 spin_lock_irqsave(&chip->reg_lock, flags);
 113                 if (beep->running)
 114                         snd_pmac_beep_stop(chip);
 115                 spin_unlock_irqrestore(&chip->reg_lock, flags);
 116                 return 0;
 117         }
 118
 119         beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);
 120         srate = chip->freq_table[beep_speed];
 121
 122         if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
 123                 hz = 1000;
 124
 125         spin_lock_irqsave(&chip->reg_lock, flags);
 126         if (chip->playback.running || chip->capture.running || beep->running) {
 127                 spin_unlock_irqrestore(&chip->reg_lock, flags);
 128                 return 0;
 129         }
 130         beep->running = 1;
 131         spin_unlock_irqrestore(&chip->reg_lock, flags);
 132
 133         if (hz == beep->hz && beep->volume == beep->volume_play) {
 134                 nsamples = beep->nsamples;
 135         } else {
 136                 period = srate * 256 / hz;      /* fixed point */
 137                 ncycles = BEEP_BUFLEN * 256 / period;
 138                 nsamples = (period * ncycles) >> 8;
 139                 f = ncycles * 65536 / nsamples;
 140                 j = 0;
 141                 p = beep->buf;
 142                 for (i = 0; i < nsamples; ++i, p += 2) {
 143                         p[0] = p[1] = beep_wform[j >> 8] * beep->volume;
 144                         j = (j + f) & 0xffff;
 145                 }
 146                 beep->hz = hz;
 147                 beep->volume_play = beep->volume;
 148                 beep->nsamples = nsamples;
 149         }
 150
 151         spin_lock_irqsave(&chip->reg_lock, flags);
 152         snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);
 153         spin_unlock_irqrestore(&chip->reg_lock, flags);
 154         return 0;
 155 }
 156
 157 /*
 158  * beep volume mixer
 159  */
 160
 161 static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol,
 162                               struct snd_ctl_elem_info *uinfo)
 163 {
 164         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 165         uinfo->count = 1;
 166         uinfo->value.integer.min = 0;
 167         uinfo->value.integer.max = 100;
 168         return 0;
 169 }
 170
 171 static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol,
 172                              struct snd_ctl_elem_value *ucontrol)
 173 {
 174         struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
 175         if (snd_BUG_ON(!chip->beep))
 176                 return -ENXIO;
 177         ucontrol->value.integer.value[0] = chip->beep->volume;
 178         return 0;
 179 }
 180
 181 static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
 182                              struct snd_ctl_elem_value *ucontrol)
 183 {
 184         struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
 185         unsigned int oval, nval;
 186         if (snd_BUG_ON(!chip->beep))
 187                 return -ENXIO;
 188         oval = chip->beep->volume;
 189         nval = ucontrol->value.integer.value[0];
 190         if (nval > 100)
 191                 return -EINVAL;
 192         chip->beep->volume = nval;
 193         return oval != chip->beep->volume;
 194 }
 195
 196 static const struct snd_kcontrol_new snd_pmac_beep_mixer = {
 197         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 198         .name = "Beep Playback Volume",
 199         .info = snd_pmac_info_beep,
 200         .get = snd_pmac_get_beep,
 201         .put = snd_pmac_put_beep,
 202 };
 203
 204 /* Initialize beep stuff */
 205 int snd_pmac_attach_beep(struct snd_pmac *chip)
 206 {
 207         struct pmac_beep *beep;
 208         struct input_dev *input_dev;
 209         struct snd_kcontrol *beep_ctl;
 210         void *dmabuf;
 211         int err = -ENOMEM;
 212
 213         beep = kzalloc(sizeof(*beep), GFP_KERNEL);
 214         if (! beep)
 215                 return -ENOMEM;
 216         dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
 217                                     &beep->addr, GFP_KERNEL);
 218         input_dev = input_allocate_device();
 219         if (! dmabuf || ! input_dev)
 220                 goto fail1;
 221
 222         /* FIXME: set more better values */
 223         input_dev->name = "PowerMac Beep";
 224         input_dev->phys = "powermac/beep";
 225         input_dev->id.bustype = BUS_ADB;
 226         input_dev->id.vendor = 0x001f;
 227         input_dev->id.product = 0x0001;
 228         input_dev->id.version = 0x0100;
 229
 230         input_dev->evbit[0] = BIT_MASK(EV_SND);
 231         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 232         input_dev->event = snd_pmac_beep_event;
 233         input_dev->dev.parent = &chip->pdev->dev;
 234         input_set_drvdata(input_dev, chip);
 235
 236         beep->dev = input_dev;
 237         beep->buf = dmabuf;
 238         beep->volume = BEEP_VOLUME;
 239         beep->running = 0;
 240
 241         beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);
 242         err = snd_ctl_add(chip->card, beep_ctl);
 243         if (err < 0)
 244                 goto fail1;
 245
 246         chip->beep = beep;
 247
 248         err = input_register_device(beep->dev);
 249         if (err)
 250                 goto fail2;
 251
 252         return 0;
 253
 254  fail2: snd_ctl_remove(chip->card, beep_ctl);
 255  fail1: input_free_device(input_dev);
 256         if (dmabuf)
 257                 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
 258                                   dmabuf, beep->addr);
 259         kfree(beep);
 260         return err;
 261 }
 262
 263 void snd_pmac_detach_beep(struct snd_pmac *chip)
 264 {
 265         if (chip->beep) {
 266                 input_unregister_device(chip->beep->dev);
 267                 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
 268                                   chip->beep->buf, chip->beep->addr);
 269                 kfree(chip->beep);
 270                 chip->beep = NULL;
 271         }
 272 }