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 <linux/pci.h> 28 #include <linux/dma-mapping.h> 29 #include <sound/core.h> 30 #include <sound/control.h> 31 #include "pmac.h" 32 33 struct snd_pmac_beep { 34 int running; /* boolean */ 35 int volume; /* mixer volume: 0-100 */ 36 int volume_play; /* currently playing volume */ 37 int hz; 38 int nsamples; 39 short *buf; /* allocated wave buffer */ 40 dma_addr_t addr; /* physical address of buffer */ 41 struct input_dev *dev; 42 }; 43 44 /* 45 * stop beep if running 46 */ 47 void snd_pmac_beep_stop(pmac_t *chip) 48 { 49 pmac_beep_t *beep = chip->beep; 50 if (beep && beep->running) { 51 beep->running = 0; 52 snd_pmac_beep_dma_stop(chip); 53 } 54 } 55 56 /* 57 * Stuff for outputting a beep. The values range from -327 to +327 58 * so we can multiply by an amplitude in the range 0..100 to get a 59 * signed short value to put in the output buffer. 60 */ 61 static short beep_wform[256] = { 62 0, 40, 79, 117, 153, 187, 218, 245, 63 269, 288, 304, 316, 323, 327, 327, 324, 64 318, 310, 299, 288, 275, 262, 249, 236, 65 224, 213, 204, 196, 190, 186, 183, 182, 66 182, 183, 186, 189, 192, 196, 200, 203, 67 206, 208, 209, 209, 209, 207, 204, 201, 68 197, 193, 188, 183, 179, 174, 170, 166, 69 163, 161, 160, 159, 159, 160, 161, 162, 70 164, 166, 168, 169, 171, 171, 171, 170, 71 169, 167, 163, 159, 155, 150, 144, 139, 72 133, 128, 122, 117, 113, 110, 107, 105, 73 103, 103, 103, 103, 104, 104, 105, 105, 74 105, 103, 101, 97, 92, 86, 78, 68, 75 58, 45, 32, 18, 3, -11, -26, -41, 76 -55, -68, -79, -88, -95, -100, -102, -102, 77 -99, -93, -85, -75, -62, -48, -33, -16, 78 0, 16, 33, 48, 62, 75, 85, 93, 79 99, 102, 102, 100, 95, 88, 79, 68, 80 55, 41, 26, 11, -3, -18, -32, -45, 81 -58, -68, -78, -86, -92, -97, -101, -103, 82 -105, -105, -105, -104, -104, -103, -103, -103, 83 -103, -105, -107, -110, -113, -117, -122, -128, 84 -133, -139, -144, -150, -155, -159, -163, -167, 85 -169, -170, -171, -171, -171, -169, -168, -166, 86 -164, -162, -161, -160, -159, -159, -160, -161, 87 -163, -166, -170, -174, -179, -183, -188, -193, 88 -197, -201, -204, -207, -209, -209, -209, -208, 89 -206, -203, -200, -196, -192, -189, -186, -183, 90 -182, -182, -183, -186, -190, -196, -204, -213, 91 -224, -236, -249, -262, -275, -288, -299, -310, 92 -318, -324, -327, -327, -323, -316, -304, -288, 93 -269, -245, -218, -187, -153, -117, -79, -40, 94 }; 95 96 #define BEEP_SRATE 22050 /* 22050 Hz sample rate */ 97 #define BEEP_BUFLEN 512 98 #define BEEP_VOLUME 15 /* 0 - 100 */ 99 100 static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type, unsigned int code, int hz) 101 { 102 pmac_t *chip; 103 pmac_beep_t *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 = dev->private; 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 #define chip_t pmac_t 175 176 static int snd_pmac_info_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo) 177 { 178 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 179 uinfo->count = 1; 180 uinfo->value.integer.min = 0; 181 uinfo->value.integer.max = 100; 182 return 0; 183 } 184 185 static int snd_pmac_get_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol) 186 { 187 pmac_t *chip = snd_kcontrol_chip(kcontrol); 188 snd_assert(chip->beep, return -ENXIO); 189 ucontrol->value.integer.value[0] = chip->beep->volume; 190 return 0; 191 } 192 193 static int snd_pmac_put_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol) 194 { 195 pmac_t *chip = snd_kcontrol_chip(kcontrol); 196 int oval; 197 snd_assert(chip->beep, return -ENXIO); 198 oval = chip->beep->volume; 199 chip->beep->volume = ucontrol->value.integer.value[0]; 200 return oval != chip->beep->volume; 201 } 202 203 static snd_kcontrol_new_t snd_pmac_beep_mixer = { 204 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 205 .name = "Beep Playback Volume", 206 .info = snd_pmac_info_beep, 207 .get = snd_pmac_get_beep, 208 .put = snd_pmac_put_beep, 209 }; 210 211 /* Initialize beep stuff */ 212 int __init snd_pmac_attach_beep(pmac_t *chip) 213 { 214 pmac_beep_t *beep; 215 struct input_dev *input_dev; 216 void *dmabuf; 217 int err = -ENOMEM; 218 219 beep = kzalloc(sizeof(*beep), GFP_KERNEL); 220 dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, 221 &beep->addr, GFP_KERNEL); 222 input_dev = input_allocate_device(); 223 if (!beep || !dmabuf || !input_dev) 224 goto fail; 225 226 /* FIXME: set more better values */ 227 input_dev->name = "PowerMac Beep"; 228 input_dev->phys = "powermac/beep"; 229 input_dev->id.bustype = BUS_ADB; 230 input_dev->id.vendor = 0x001f; 231 input_dev->id.product = 0x0001; 232 input_dev->id.version = 0x0100; 233 234 input_dev->evbit[0] = BIT(EV_SND); 235 input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); 236 input_dev->event = snd_pmac_beep_event; 237 input_dev->private = chip; 238 input_dev->cdev.dev = &chip->pdev->dev; 239 240 beep->dev = input_dev; 241 beep->buf = dmabuf; 242 beep->volume = BEEP_VOLUME; 243 beep->running = 0; 244 245 err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_pmac_beep_mixer, chip)); 246 if (err < 0) 247 goto fail; 248 249 chip->beep = beep; 250 input_register_device(beep->dev); 251 252 return 0; 253 254 fail: input_free_device(input_dev); 255 kfree(dmabuf); 256 kfree(beep); 257 return err; 258 } 259 260 void snd_pmac_detach_beep(pmac_t *chip) 261 { 262 if (chip->beep) { 263 input_unregister_device(chip->beep->dev); 264 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4, 265 chip->beep->buf, chip->beep->addr); 266 kfree(chip->beep); 267 chip->beep = NULL; 268 } 269 } 270