Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | } |