diff options
Diffstat (limited to 'sound/ppc/beep.c')
| -rw-r--r-- | sound/ppc/beep.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/sound/ppc/beep.c b/sound/ppc/beep.c new file mode 100644 index 000000000000..c23f601a37f9 --- /dev/null +++ b/sound/ppc/beep.c @@ -0,0 +1,262 @@ +/* + * Beep using pcm + * + * Copyright (c) by Takashi Iwai <tiwai@suse.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <sound/driver.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/input.h> +#include <sound/core.h> +#include <sound/control.h> +#include "pmac.h" + +struct snd_pmac_beep { + int running; /* boolean */ + int volume; /* mixer volume: 0-100 */ + int volume_play; /* currently playing volume */ + int hz; + int nsamples; + short *buf; /* allocated wave buffer */ + unsigned long addr; /* physical address of buffer */ + struct input_dev dev; +}; + +/* + * stop beep if running + */ +void snd_pmac_beep_stop(pmac_t *chip) +{ + pmac_beep_t *beep = chip->beep; + if (beep && beep->running) { + beep->running = 0; + snd_pmac_beep_dma_stop(chip); + } +} + +/* + * Stuff for outputting a beep. The values range from -327 to +327 + * so we can multiply by an amplitude in the range 0..100 to get a + * signed short value to put in the output buffer. + */ +static short beep_wform[256] = { + 0, 40, 79, 117, 153, 187, 218, 245, + 269, 288, 304, 316, 323, 327, 327, 324, + 318, 310, 299, 288, 275, 262, 249, 236, + 224, 213, 204, 196, 190, 186, 183, 182, + 182, 183, 186, 189, 192, 196, 200, 203, + 206, 208, 209, 209, 209, 207, 204, 201, + 197, 193, 188, 183, 179, 174, 170, 166, + 163, 161, 160, 159, 159, 160, 161, 162, + 164, 166, 168, 169, 171, 171, 171, 170, + 169, 167, 163, 159, 155, 150, 144, 139, + 133, 128, 122, 117, 113, 110, 107, 105, + 103, 103, 103, 103, 104, 104, 105, 105, + 105, 103, 101, 97, 92, 86, 78, 68, + 58, 45, 32, 18, 3, -11, -26, -41, + -55, -68, -79, -88, -95, -100, -102, -102, + -99, -93, -85, -75, -62, -48, -33, -16, + 0, 16, 33, 48, 62, 75, 85, 93, + 99, 102, 102, 100, 95, 88, 79, 68, + 55, 41, 26, 11, -3, -18, -32, -45, + -58, -68, -78, -86, -92, -97, -101, -103, + -105, -105, -105, -104, -104, -103, -103, -103, + -103, -105, -107, -110, -113, -117, -122, -128, + -133, -139, -144, -150, -155, -159, -163, -167, + -169, -170, -171, -171, -171, -169, -168, -166, + -164, -162, -161, -160, -159, -159, -160, -161, + -163, -166, -170, -174, -179, -183, -188, -193, + -197, -201, -204, -207, -209, -209, -209, -208, + -206, -203, -200, -196, -192, -189, -186, -183, + -182, -182, -183, -186, -190, -196, -204, -213, + -224, -236, -249, -262, -275, -288, -299, -310, + -318, -324, -327, -327, -323, -316, -304, -288, + -269, -245, -218, -187, -153, -117, -79, -40, +}; + +#define BEEP_SRATE 22050 /* 22050 Hz sample rate */ +#define BEEP_BUFLEN 512 +#define BEEP_VOLUME 15 /* 0 - 100 */ + +static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type, unsigned int code, int hz) +{ + pmac_t *chip; + pmac_beep_t *beep; + unsigned long flags; + int beep_speed = 0; + int srate; + int period, ncycles, nsamples; + int i, j, f; + short *p; + + if (type != EV_SND) + return -1; + + switch (code) { + case SND_BELL: if (hz) hz = 1000; + case SND_TONE: break; + default: return -1; + } + + chip = dev->private; + if (! chip || (beep = chip->beep) == NULL) + return -1; + + if (! hz) { + spin_lock_irqsave(&chip->reg_lock, flags); + if (beep->running) + snd_pmac_beep_stop(chip); + spin_unlock_irqrestore(&chip->reg_lock, flags); + return 0; + } + + beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE); + srate = chip->freq_table[beep_speed]; + + if (hz <= srate / BEEP_BUFLEN || hz > srate / 2) + hz = 1000; + + spin_lock_irqsave(&chip->reg_lock, flags); + if (chip->playback.running || chip->capture.running || beep->running) { + spin_unlock_irqrestore(&chip->reg_lock, flags); + return 0; + } + beep->running = 1; + spin_unlock_irqrestore(&chip->reg_lock, flags); + + if (hz == beep->hz && beep->volume == beep->volume_play) { + nsamples = beep->nsamples; + } else { + period = srate * 256 / hz; /* fixed point */ + ncycles = BEEP_BUFLEN * 256 / period; + nsamples = (period * ncycles) >> 8; + f = ncycles * 65536 / nsamples; + j = 0; + p = beep->buf; + for (i = 0; i < nsamples; ++i, p += 2) { + p[0] = p[1] = beep_wform[j >> 8] * beep->volume; + j = (j + f) & 0xffff; + } + beep->hz = hz; + beep->volume_play = beep->volume; + beep->nsamples = nsamples; + } + + spin_lock_irqsave(&chip->reg_lock, flags); + snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed); + spin_unlock_irqrestore(&chip->reg_lock, flags); + return 0; +} + +/* + * beep volume mixer + */ + +#define chip_t pmac_t + +static int snd_pmac_info_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 1; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 100; + return 0; +} + +static int snd_pmac_get_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol) +{ + pmac_t *chip = snd_kcontrol_chip(kcontrol); + snd_assert(chip->beep, return -ENXIO); + ucontrol->value.integer.value[0] = chip->beep->volume; + return 0; +} + +static int snd_pmac_put_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol) +{ + pmac_t *chip = snd_kcontrol_chip(kcontrol); + int oval; + snd_assert(chip->beep, return -ENXIO); + oval = chip->beep->volume; + chip->beep->volume = ucontrol->value.integer.value[0]; + return oval != chip->beep->volume; +} + +static snd_kcontrol_new_t snd_pmac_beep_mixer = { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "Beep Playback Volume", + .info = snd_pmac_info_beep, + .get = snd_pmac_get_beep, + .put = snd_pmac_put_beep, +}; + +/* Initialize beep stuff */ +int __init snd_pmac_attach_beep(pmac_t *chip) +{ + pmac_beep_t *beep; + int err; + + beep = kmalloc(sizeof(*beep), GFP_KERNEL); + if (! beep) + return -ENOMEM; + + memset(beep, 0, sizeof(*beep)); + beep->buf = (short *) kmalloc(BEEP_BUFLEN * 4, GFP_KERNEL); + if (! beep->buf) { + kfree(beep); + return -ENOMEM; + } + beep->addr = virt_to_bus(beep->buf); + + beep->dev.evbit[0] = BIT(EV_SND); + beep->dev.sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); + beep->dev.event = snd_pmac_beep_event; + beep->dev.private = chip; + + /* FIXME: set more better values */ + beep->dev.name = "PowerMac Beep"; + beep->dev.phys = "powermac/beep"; + beep->dev.id.bustype = BUS_ADB; + beep->dev.id.vendor = 0x001f; + beep->dev.id.product = 0x0001; + beep->dev.id.version = 0x0100; + + beep->volume = BEEP_VOLUME; + beep->running = 0; + if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_pmac_beep_mixer, chip))) < 0) { + kfree(beep->buf); + kfree(beep); + return err; + } + + chip->beep = beep; + input_register_device(&beep->dev); + + return 0; +} + +void snd_pmac_detach_beep(pmac_t *chip) +{ + if (chip->beep) { + input_unregister_device(&chip->beep->dev); + kfree(chip->beep->buf); + kfree(chip->beep); + chip->beep = NULL; + } +} |