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 <linux/io.h> 22 #include <asm/irq.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/input.h> 26 #include <linux/pci.h> 27 #include <linux/dma-mapping.h> 28 #include <sound/core.h> 29 #include <sound/control.h> 30 #include "pmac.h" 31 32 struct pmac_beep { 33 int running; /* boolean */ 34 int volume; /* mixer volume: 0-100 */ 35 int volume_play; /* currently playing volume */ 36 int hz; 37 int nsamples; 38 short *buf; /* allocated wave buffer */ 39 dma_addr_t addr; /* physical address of buffer */ 40 struct input_dev *dev; 41 }; 42 43 /* 44 * stop beep if running 45 */ 46 void snd_pmac_beep_stop(struct snd_pmac *chip) 47 { 48 struct pmac_beep *beep = chip->beep; 49 if (beep && beep->running) { 50 beep->running = 0; 51 snd_pmac_beep_dma_stop(chip); 52 } 53 } 54 55 /* 56 * Stuff for outputting a beep. The values range from -327 to +327 57 * so we can multiply by an amplitude in the range 0..100 to get a 58 * signed short value to put in the output buffer. 59 */ 60 static short beep_wform[256] = { 61 0, 40, 79, 117, 153, 187, 218, 245, 62 269, 288, 304, 316, 323, 327, 327, 324, 63 318, 310, 299, 288, 275, 262, 249, 236, 64 224, 213, 204, 196, 190, 186, 183, 182, 65 182, 183, 186, 189, 192, 196, 200, 203, 66 206, 208, 209, 209, 209, 207, 204, 201, 67 197, 193, 188, 183, 179, 174, 170, 166, 68 163, 161, 160, 159, 159, 160, 161, 162, 69 164, 166, 168, 169, 171, 171, 171, 170, 70 169, 167, 163, 159, 155, 150, 144, 139, 71 133, 128, 122, 117, 113, 110, 107, 105, 72 103, 103, 103, 103, 104, 104, 105, 105, 73 105, 103, 101, 97, 92, 86, 78, 68, 74 58, 45, 32, 18, 3, -11, -26, -41, 75 -55, -68, -79, -88, -95, -100, -102, -102, 76 -99, -93, -85, -75, -62, -48, -33, -16, 77 0, 16, 33, 48, 62, 75, 85, 93, 78 99, 102, 102, 100, 95, 88, 79, 68, 79 55, 41, 26, 11, -3, -18, -32, -45, 80 -58, -68, -78, -86, -92, -97, -101, -103, 81 -105, -105, -105, -104, -104, -103, -103, -103, 82 -103, -105, -107, -110, -113, -117, -122, -128, 83 -133, -139, -144, -150, -155, -159, -163, -167, 84 -169, -170, -171, -171, -171, -169, -168, -166, 85 -164, -162, -161, -160, -159, -159, -160, -161, 86 -163, -166, -170, -174, -179, -183, -188, -193, 87 -197, -201, -204, -207, -209, -209, -209, -208, 88 -206, -203, -200, -196, -192, -189, -186, -183, 89 -182, -182, -183, -186, -190, -196, -204, -213, 90 -224, -236, -249, -262, -275, -288, -299, -310, 91 -318, -324, -327, -327, -323, -316, -304, -288, 92 -269, -245, -218, -187, -153, -117, -79, -40, 93 }; 94 95 #define BEEP_SRATE 22050 /* 22050 Hz sample rate */ 96 #define BEEP_BUFLEN 512 97 #define BEEP_VOLUME 15 /* 0 - 100 */ 98 99 static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type, 100 unsigned int code, int hz) 101 { 102 struct snd_pmac *chip; 103 struct pmac_beep *beep; 104 unsigned long flags; 105 int beep_speed = 0; 106 int srate; 107 int period, ncycles, nsamples; 108 int i, j, f; 109 short *p; 110 111 if (type != EV_SND) 112 return -1; 113 114 switch (code) { 115 case SND_BELL: if (hz) hz = 1000; 116 case SND_TONE: break; 117 default: return -1; 118 } 119 120 chip = input_get_drvdata(dev); 121 if (! chip || (beep = chip->beep) == NULL) 122 return -1; 123 124 if (! hz) { 125 spin_lock_irqsave(&chip->reg_lock, flags); 126 if (beep->running) 127 snd_pmac_beep_stop(chip); 128 spin_unlock_irqrestore(&chip->reg_lock, flags); 129 return 0; 130 } 131 132 beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE); 133 srate = chip->freq_table[beep_speed]; 134 135 if (hz <= srate / BEEP_BUFLEN || hz > srate / 2) 136 hz = 1000; 137 138 spin_lock_irqsave(&chip->reg_lock, flags); 139 if (chip->playback.running || chip->capture.running || beep->running) { 140 spin_unlock_irqrestore(&chip->reg_lock, flags); 141 return 0; 142 } 143 beep->running = 1; 144 spin_unlock_irqrestore(&chip->reg_lock, flags); 145 146 if (hz == beep->hz && beep->volume == beep->volume_play) { 147 nsamples = beep->nsamples; 148 } else { 149 period = srate * 256 / hz; /* fixed point */ 150 ncycles = BEEP_BUFLEN * 256 / period; 151 nsamples = (period * ncycles) >> 8; 152 f = ncycles * 65536 / nsamples; 153 j = 0; 154 p = beep->buf; 155 for (i = 0; i < nsamples; ++i, p += 2) { 156 p[0] = p[1] = beep_wform[j >> 8] * beep->volume; 157 j = (j + f) & 0xffff; 158 } 159 beep->hz = hz; 160 beep->volume_play = beep->volume; 161 beep->nsamples = nsamples; 162 } 163 164 spin_lock_irqsave(&chip->reg_lock, flags); 165 snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed); 166 spin_unlock_irqrestore(&chip->reg_lock, flags); 167 return 0; 168 } 169 170 /* 171 * beep volume mixer 172 */ 173 174 static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol, 175 struct snd_ctl_elem_info *uinfo) 176 { 177 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 178 uinfo->count = 1; 179 uinfo->value.integer.min = 0; 180 uinfo->value.integer.max = 100; 181 return 0; 182 } 183 184 static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol, 185 struct snd_ctl_elem_value *ucontrol) 186 { 187 struct snd_pmac *chip = snd_kcontrol_chip(kcontrol); 188 if (snd_BUG_ON(!chip->beep)) 189 return -ENXIO; 190 ucontrol->value.integer.value[0] = chip->beep->volume; 191 return 0; 192 } 193 194 static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol, 195 struct snd_ctl_elem_value *ucontrol) 196 { 197 struct snd_pmac *chip = snd_kcontrol_chip(kcontrol); 198 unsigned int oval, nval; 199 if (snd_BUG_ON(!chip->beep)) 200 return -ENXIO; 201 oval = chip->beep->volume; 202 nval = ucontrol->value.integer.value[0]; 203 if (nval > 100) 204 return -EINVAL; 205 chip->beep->volume = nval; 206 return oval != chip->beep->volume; 207 } 208 209 static struct snd_kcontrol_new snd_pmac_beep_mixer = { 210 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 211 .name = "Beep Playback Volume", 212 .info = snd_pmac_info_beep, 213 .get = snd_pmac_get_beep, 214 .put = snd_pmac_put_beep, 215 }; 216 217 /* Initialize beep stuff */ 218 int snd_pmac_attach_beep(struct snd_pmac *chip) 219 { 220 struct pmac_beep *beep; 221 struct input_dev *input_dev; 222 struct snd_kcontrol *beep_ctl; 223 void *dmabuf; 224 int err = -ENOMEM; 225 226 beep = kzalloc(sizeof(*beep), GFP_KERNEL); 227 if (! beep) 228 return -ENOMEM; 229 dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, 230 &beep->addr, GFP_KERNEL); 231 input_dev = input_allocate_device(); 232 if (! dmabuf || ! input_dev) 233 goto fail1; 234 235 /* FIXME: set more better values */ 236 input_dev->name = "PowerMac Beep"; 237 input_dev->phys = "powermac/beep"; 238 input_dev->id.bustype = BUS_ADB; 239 input_dev->id.vendor = 0x001f; 240 input_dev->id.product = 0x0001; 241 input_dev->id.version = 0x0100; 242 243 input_dev->evbit[0] = BIT_MASK(EV_SND); 244 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 245 input_dev->event = snd_pmac_beep_event; 246 input_dev->dev.parent = &chip->pdev->dev; 247 input_set_drvdata(input_dev, chip); 248 249 beep->dev = input_dev; 250 beep->buf = dmabuf; 251 beep->volume = BEEP_VOLUME; 252 beep->running = 0; 253 254 beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip); 255 err = snd_ctl_add(chip->card, beep_ctl); 256 if (err < 0) 257 goto fail1; 258 259 chip->beep = beep; 260 261 err = input_register_device(beep->dev); 262 if (err) 263 goto fail2; 264 265 return 0; 266 267 fail2: snd_ctl_remove(chip->card, beep_ctl); 268 fail1: input_free_device(input_dev); 269 if (dmabuf) 270 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, 271 dmabuf, beep->addr); 272 kfree(beep); 273 return err; 274 } 275 276 void snd_pmac_detach_beep(struct snd_pmac *chip) 277 { 278 if (chip->beep) { 279 input_unregister_device(chip->beep->dev); 280 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, 281 chip->beep->buf, chip->beep->addr); 282 kfree(chip->beep); 283 chip->beep = NULL; 284 } 285 } 286