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linux/sound/ppc/beep.c
Anders Roxell a98478f825 ALSA: ppc: beep: fix clang -Wimplicit-fallthrough 
Clang warns:

sound/ppc/beep.c:103:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
        case SND_TONE: break;
        ^
sound/ppc/beep.c:103:2: note: insert 'break;' to avoid fall-through
        case SND_TONE: break;
        ^
        break;
1 warning generated.

Clang is more pedantic than GCC, which does not warn when failing
through to a case that is just break or return. Clang's version
is more in line with the kernel's own stance in deprecated.rst.
Add athe missing break to silence the warning.

Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Link: https://lore.kernel.org/r/20211207110053.695712-1-anders.roxell@linaro.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-12-07 15:36:56 +01:00

276 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Beep using pcm
*
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
*/
#include <linux/io.h>
#include <asm/irq.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/control.h>
#include "pmac.h"
struct 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 */
dma_addr_t addr; /* physical address of buffer */
struct input_dev *dev;
};
/*
* stop beep if running
*/
void snd_pmac_beep_stop(struct snd_pmac *chip)
{
struct pmac_beep *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 const 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)
{
struct snd_pmac *chip;
struct pmac_beep *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; break;
case SND_TONE: break;
default: return -1;
}
chip = input_get_drvdata(dev);
if (!chip)
return -1;
beep = chip->beep;
if (!beep)
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
*/
static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *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(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
if (snd_BUG_ON(!chip->beep))
return -ENXIO;
ucontrol->value.integer.value[0] = chip->beep->volume;
return 0;
}
static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
unsigned int oval, nval;
if (snd_BUG_ON(!chip->beep))
return -ENXIO;
oval = chip->beep->volume;
nval = ucontrol->value.integer.value[0];
if (nval > 100)
return -EINVAL;
chip->beep->volume = nval;
return oval != chip->beep->volume;
}
static const struct snd_kcontrol_new 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 snd_pmac_attach_beep(struct snd_pmac *chip)
{
struct pmac_beep *beep;
struct input_dev *input_dev;
struct snd_kcontrol *beep_ctl;
void *dmabuf;
int err = -ENOMEM;
beep = kzalloc(sizeof(*beep), GFP_KERNEL);
if (! beep)
return -ENOMEM;
dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
&beep->addr, GFP_KERNEL);
input_dev = input_allocate_device();
if (! dmabuf || ! input_dev)
goto fail1;
/* FIXME: set more better values */
input_dev->name = "PowerMac Beep";
input_dev->phys = "powermac/beep";
input_dev->id.bustype = BUS_ADB;
input_dev->id.vendor = 0x001f;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->evbit[0] = BIT_MASK(EV_SND);
input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
input_dev->event = snd_pmac_beep_event;
input_dev->dev.parent = &chip->pdev->dev;
input_set_drvdata(input_dev, chip);
beep->dev = input_dev;
beep->buf = dmabuf;
beep->volume = BEEP_VOLUME;
beep->running = 0;
beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);
err = snd_ctl_add(chip->card, beep_ctl);
if (err < 0)
goto fail1;
chip->beep = beep;
err = input_register_device(beep->dev);
if (err)
goto fail2;
return 0;
fail2: snd_ctl_remove(chip->card, beep_ctl);
fail1: input_free_device(input_dev);
if (dmabuf)
dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
dmabuf, beep->addr);
kfree(beep);
return err;
}
void snd_pmac_detach_beep(struct snd_pmac *chip)
{
if (chip->beep) {
input_unregister_device(chip->beep->dev);
dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
chip->beep->buf, chip->beep->addr);
kfree(chip->beep);
chip->beep = NULL;
}
}
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