sound/ppc/beep.c

   1 /*
   2  * Beep using pcm
   3  *
   4  * Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20
  21 #include <sound/driver.h>
  22 #include <asm/io.h>
  23 #include <asm/irq.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/input.h>
  27 #include <sound/core.h>
  28 #include <sound/control.h>
  29 #include "pmac.h"
  30
  31 struct snd_pmac_beep {
  32         int running;    /* boolean */
  33         int volume;     /* mixer volume: 0-100 */
  34         int volume_play;        /* currently playing volume */
  35         int hz;
  36         int nsamples;
  37         short *buf;             /* allocated wave buffer */
  38         unsigned long addr;     /* physical address of buffer */
  39         struct input_dev dev;
  40 };
  41
  42 /*
  43  * stop beep if running
  44  */
  45 void snd_pmac_beep_stop(pmac_t *chip)
  46 {
  47         pmac_beep_t *beep = chip->beep;
  48         if (beep && beep->running) {
  49                 beep->running = 0;
  50                 snd_pmac_beep_dma_stop(chip);
  51         }
  52 }
  53
  54 /*
  55  * Stuff for outputting a beep.  The values range from -327 to +327
  56  * so we can multiply by an amplitude in the range 0..100 to get a
  57  * signed short value to put in the output buffer.
  58  */
  59 static short beep_wform[256] = {
  60         0,      40,     79,     117,    153,    187,    218,    245,
  61         269,    288,    304,    316,    323,    327,    327,    324,
  62         318,    310,    299,    288,    275,    262,    249,    236,
  63         224,    213,    204,    196,    190,    186,    183,    182,
  64         182,    183,    186,    189,    192,    196,    200,    203,
  65         206,    208,    209,    209,    209,    207,    204,    201,
  66         197,    193,    188,    183,    179,    174,    170,    166,
  67         163,    161,    160,    159,    159,    160,    161,    162,
  68         164,    166,    168,    169,    171,    171,    171,    170,
  69         169,    167,    163,    159,    155,    150,    144,    139,
  70         133,    128,    122,    117,    113,    110,    107,    105,
  71         103,    103,    103,    103,    104,    104,    105,    105,
  72         105,    103,    101,    97,     92,     86,     78,     68,
  73         58,     45,     32,     18,     3,      -11,    -26,    -41,
  74         -55,    -68,    -79,    -88,    -95,    -100,   -102,   -102,
  75         -99,    -93,    -85,    -75,    -62,    -48,    -33,    -16,
  76         0,      16,     33,     48,     62,     75,     85,     93,
  77         99,     102,    102,    100,    95,     88,     79,     68,
  78         55,     41,     26,     11,     -3,     -18,    -32,    -45,
  79         -58,    -68,    -78,    -86,    -92,    -97,    -101,   -103,
  80         -105,   -105,   -105,   -104,   -104,   -103,   -103,   -103,
  81         -103,   -105,   -107,   -110,   -113,   -117,   -122,   -128,
  82         -133,   -139,   -144,   -150,   -155,   -159,   -163,   -167,
  83         -169,   -170,   -171,   -171,   -171,   -169,   -168,   -166,
  84         -164,   -162,   -161,   -160,   -159,   -159,   -160,   -161,
  85         -163,   -166,   -170,   -174,   -179,   -183,   -188,   -193,
  86         -197,   -201,   -204,   -207,   -209,   -209,   -209,   -208,
  87         -206,   -203,   -200,   -196,   -192,   -189,   -186,   -183,
  88         -182,   -182,   -183,   -186,   -190,   -196,   -204,   -213,
  89         -224,   -236,   -249,   -262,   -275,   -288,   -299,   -310,
  90         -318,   -324,   -327,   -327,   -323,   -316,   -304,   -288,
  91         -269,   -245,   -218,   -187,   -153,   -117,   -79,    -40,
  92 };
  93
  94 #define BEEP_SRATE      22050   /* 22050 Hz sample rate */
  95 #define BEEP_BUFLEN     512
  96 #define BEEP_VOLUME     15      /* 0 - 100 */
  97
  98 static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type, unsigned int code, int hz)
  99 {
 100         pmac_t *chip;
 101         pmac_beep_t *beep;
 102         unsigned long flags;
 103         int beep_speed = 0;
 104         int srate;
 105         int period, ncycles, nsamples;
 106         int i, j, f;
 107         short *p;
 108
 109         if (type != EV_SND)
 110                 return -1;
 111
 112         switch (code) {
 113         case SND_BELL: if (hz) hz = 1000;
 114         case SND_TONE: break;
 115         default: return -1;
 116         }
 117
 118         chip = dev->private;
 119         if (! chip || (beep = chip->beep) == NULL)
 120                 return -1;
 121
 122         if (! hz) {
 123                 spin_lock_irqsave(&chip->reg_lock, flags);
 124                 if (beep->running)
 125                         snd_pmac_beep_stop(chip);
 126                 spin_unlock_irqrestore(&chip->reg_lock, flags);
 127                 return 0;
 128         }
 129
 130         beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);
 131         srate = chip->freq_table[beep_speed];
 132
 133         if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
 134                 hz = 1000;
 135
 136         spin_lock_irqsave(&chip->reg_lock, flags);
 137         if (chip->playback.running || chip->capture.running || beep->running) {
 138                 spin_unlock_irqrestore(&chip->reg_lock, flags);
 139                 return 0;
 140         }
 141         beep->running = 1;
 142         spin_unlock_irqrestore(&chip->reg_lock, flags);
 143
 144         if (hz == beep->hz && beep->volume == beep->volume_play) {
 145                 nsamples = beep->nsamples;
 146         } else {
 147                 period = srate * 256 / hz;      /* fixed point */
 148                 ncycles = BEEP_BUFLEN * 256 / period;
 149                 nsamples = (period * ncycles) >> 8;
 150                 f = ncycles * 65536 / nsamples;
 151                 j = 0;
 152                 p = beep->buf;
 153                 for (i = 0; i < nsamples; ++i, p += 2) {
 154                         p[0] = p[1] = beep_wform[j >> 8] * beep->volume;
 155                         j = (j + f) & 0xffff;
 156                 }
 157                 beep->hz = hz;
 158                 beep->volume_play = beep->volume;
 159                 beep->nsamples = nsamples;
 160         }
 161
 162         spin_lock_irqsave(&chip->reg_lock, flags);
 163         snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);
 164         spin_unlock_irqrestore(&chip->reg_lock, flags);
 165         return 0;
 166 }
 167
 168 /*
 169  * beep volume mixer
 170  */
 171
 172 #define chip_t pmac_t
 173
 174 static int snd_pmac_info_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
 175 {
 176         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 177         uinfo->count = 1;
 178         uinfo->value.integer.min = 0;
 179         uinfo->value.integer.max = 100;
 180         return 0;
 181 }
 182
 183 static int snd_pmac_get_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
 184 {
 185         pmac_t *chip = snd_kcontrol_chip(kcontrol);
 186         snd_assert(chip->beep, return -ENXIO);
 187         ucontrol->value.integer.value[0] = chip->beep->volume;
 188         return 0;
 189 }
 190
 191 static int snd_pmac_put_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
 192 {
 193         pmac_t *chip = snd_kcontrol_chip(kcontrol);
 194         int oval;
 195         snd_assert(chip->beep, return -ENXIO);
 196         oval = chip->beep->volume;
 197         chip->beep->volume = ucontrol->value.integer.value[0];
 198         return oval != chip->beep->volume;
 199 }
 200
 201 static snd_kcontrol_new_t snd_pmac_beep_mixer = {
 202         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 203         .name = "Beep Playback Volume",
 204         .info = snd_pmac_info_beep,
 205         .get = snd_pmac_get_beep,
 206         .put = snd_pmac_put_beep,
 207 };
 208
 209 /* Initialize beep stuff */
 210 int __init snd_pmac_attach_beep(pmac_t *chip)
 211 {
 212         pmac_beep_t *beep;
 213         int err;
 214
 215         beep = kmalloc(sizeof(*beep), GFP_KERNEL);
 216         if (! beep)
 217                 return -ENOMEM;
 218
 219         memset(beep, 0, sizeof(*beep));
 220         beep->buf = (short *) kmalloc(BEEP_BUFLEN * 4, GFP_KERNEL);
 221         if (! beep->buf) {
 222                 kfree(beep);
 223                 return -ENOMEM;
 224         }
 225         beep->addr = virt_to_bus(beep->buf);
 226
 227         beep->dev.evbit[0] = BIT(EV_SND);
 228         beep->dev.sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
 229         beep->dev.event = snd_pmac_beep_event;
 230         beep->dev.private = chip;
 231
 232         /* FIXME: set more better values */
 233         beep->dev.name = "PowerMac Beep";
 234         beep->dev.phys = "powermac/beep";
 235         beep->dev.id.bustype = BUS_ADB;
 236         beep->dev.id.vendor = 0x001f;
 237         beep->dev.id.product = 0x0001;
 238         beep->dev.id.version = 0x0100;
 239
 240         beep->volume = BEEP_VOLUME;
 241         beep->running = 0;
 242         if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_pmac_beep_mixer, chip))) < 0) {
 243                 kfree(beep->buf);
 244                 kfree(beep);
 245                 return err;
 246         }
 247
 248         chip->beep = beep;
 249         input_register_device(&beep->dev);
 250
 251         return 0;
 252 }
 253
 254 void snd_pmac_detach_beep(pmac_t *chip)
 255 {
 256         if (chip->beep) {
 257                 input_unregister_device(&chip->beep->dev);
 258                 kfree(chip->beep->buf);
 259                 kfree(chip->beep);
 260                 chip->beep = NULL;
 261         }
 262 }