349 lines
8.0 KiB
C
349 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2011 Broadcom Corporation. All rights reserved. */
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include "bcm2835.h"
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static bool enable_hdmi;
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static bool enable_headphones;
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static bool enable_compat_alsa = true;
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static int num_channels = MAX_SUBSTREAMS;
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module_param(enable_hdmi, bool, 0444);
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MODULE_PARM_DESC(enable_hdmi, "Enables HDMI virtual audio device");
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module_param(enable_headphones, bool, 0444);
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MODULE_PARM_DESC(enable_headphones, "Enables Headphones virtual audio device");
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module_param(enable_compat_alsa, bool, 0444);
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MODULE_PARM_DESC(enable_compat_alsa,
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"Enables ALSA compatibility virtual audio device");
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module_param(num_channels, int, 0644);
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MODULE_PARM_DESC(num_channels, "Number of audio channels (default: 8)");
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static void bcm2835_devm_free_vchi_ctx(struct device *dev, void *res)
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{
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struct bcm2835_vchi_ctx *vchi_ctx = res;
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bcm2835_free_vchi_ctx(vchi_ctx);
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}
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static int bcm2835_devm_add_vchi_ctx(struct device *dev)
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{
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struct bcm2835_vchi_ctx *vchi_ctx;
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int ret;
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vchi_ctx = devres_alloc(bcm2835_devm_free_vchi_ctx, sizeof(*vchi_ctx),
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GFP_KERNEL);
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if (!vchi_ctx)
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return -ENOMEM;
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ret = bcm2835_new_vchi_ctx(dev, vchi_ctx);
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if (ret) {
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devres_free(vchi_ctx);
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return ret;
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}
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devres_add(dev, vchi_ctx);
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return 0;
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}
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typedef int (*bcm2835_audio_newpcm_func)(struct bcm2835_chip *chip,
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const char *name,
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enum snd_bcm2835_route route,
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u32 numchannels);
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typedef int (*bcm2835_audio_newctl_func)(struct bcm2835_chip *chip);
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struct bcm2835_audio_driver {
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struct device_driver driver;
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const char *shortname;
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const char *longname;
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int minchannels;
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bcm2835_audio_newpcm_func newpcm;
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bcm2835_audio_newctl_func newctl;
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enum snd_bcm2835_route route;
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};
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static int bcm2835_audio_alsa_newpcm(struct bcm2835_chip *chip,
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const char *name,
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enum snd_bcm2835_route route,
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u32 numchannels)
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{
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int err;
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err = snd_bcm2835_new_pcm(chip, "bcm2835 ALSA", 0, AUDIO_DEST_AUTO,
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numchannels - 1, false);
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if (err)
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return err;
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err = snd_bcm2835_new_pcm(chip, "bcm2835 IEC958/HDMI", 1, 0, 1, true);
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if (err)
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return err;
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return 0;
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}
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static int bcm2835_audio_simple_newpcm(struct bcm2835_chip *chip,
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const char *name,
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enum snd_bcm2835_route route,
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u32 numchannels)
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{
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return snd_bcm2835_new_pcm(chip, name, 0, route, numchannels, false);
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}
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static struct bcm2835_audio_driver bcm2835_audio_alsa = {
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.driver = {
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.name = "bcm2835_alsa",
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.owner = THIS_MODULE,
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},
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.shortname = "bcm2835 ALSA",
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.longname = "bcm2835 ALSA",
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.minchannels = 2,
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.newpcm = bcm2835_audio_alsa_newpcm,
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.newctl = snd_bcm2835_new_ctl,
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};
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static struct bcm2835_audio_driver bcm2835_audio_hdmi = {
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.driver = {
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.name = "bcm2835_hdmi",
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.owner = THIS_MODULE,
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},
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.shortname = "bcm2835 HDMI",
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.longname = "bcm2835 HDMI",
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.minchannels = 1,
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.newpcm = bcm2835_audio_simple_newpcm,
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.newctl = snd_bcm2835_new_hdmi_ctl,
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.route = AUDIO_DEST_HDMI
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};
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static struct bcm2835_audio_driver bcm2835_audio_headphones = {
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.driver = {
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.name = "bcm2835_headphones",
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.owner = THIS_MODULE,
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},
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.shortname = "bcm2835 Headphones",
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.longname = "bcm2835 Headphones",
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.minchannels = 1,
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.newpcm = bcm2835_audio_simple_newpcm,
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.newctl = snd_bcm2835_new_headphones_ctl,
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.route = AUDIO_DEST_HEADPHONES
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};
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struct bcm2835_audio_drivers {
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struct bcm2835_audio_driver *audio_driver;
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const bool *is_enabled;
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};
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static struct bcm2835_audio_drivers children_devices[] = {
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{
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.audio_driver = &bcm2835_audio_alsa,
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.is_enabled = &enable_compat_alsa,
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},
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{
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.audio_driver = &bcm2835_audio_hdmi,
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.is_enabled = &enable_hdmi,
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},
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{
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.audio_driver = &bcm2835_audio_headphones,
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.is_enabled = &enable_headphones,
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},
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};
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static void bcm2835_card_free(void *data)
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{
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snd_card_free(data);
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}
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static int snd_add_child_device(struct device *dev,
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struct bcm2835_audio_driver *audio_driver,
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u32 numchans)
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{
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struct bcm2835_chip *chip;
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struct snd_card *card;
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int err;
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err = snd_card_new(dev, -1, NULL, THIS_MODULE, sizeof(*chip), &card);
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if (err < 0) {
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dev_err(dev, "Failed to create card");
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return err;
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}
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chip = card->private_data;
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chip->card = card;
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chip->dev = dev;
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mutex_init(&chip->audio_mutex);
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chip->vchi_ctx = devres_find(dev,
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bcm2835_devm_free_vchi_ctx, NULL, NULL);
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if (!chip->vchi_ctx) {
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err = -ENODEV;
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goto error;
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}
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strscpy(card->driver, audio_driver->driver.name, sizeof(card->driver));
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strscpy(card->shortname, audio_driver->shortname, sizeof(card->shortname));
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strscpy(card->longname, audio_driver->longname, sizeof(card->longname));
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err = audio_driver->newpcm(chip, audio_driver->shortname,
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audio_driver->route,
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numchans);
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if (err) {
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dev_err(dev, "Failed to create pcm, error %d\n", err);
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goto error;
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}
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err = audio_driver->newctl(chip);
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if (err) {
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dev_err(dev, "Failed to create controls, error %d\n", err);
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goto error;
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}
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err = snd_card_register(card);
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if (err) {
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dev_err(dev, "Failed to register card, error %d\n", err);
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goto error;
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}
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dev_set_drvdata(dev, chip);
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err = devm_add_action(dev, bcm2835_card_free, card);
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if (err < 0) {
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dev_err(dev, "Failed to add devm action, err %d\n", err);
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goto error;
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}
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dev_info(dev, "card created with %d channels\n", numchans);
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return 0;
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error:
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snd_card_free(card);
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return err;
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}
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static int snd_add_child_devices(struct device *device, u32 numchans)
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{
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int extrachannels_per_driver = 0;
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int extrachannels_remainder = 0;
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int count_devices = 0;
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int extrachannels = 0;
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int minchannels = 0;
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int i;
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for (i = 0; i < ARRAY_SIZE(children_devices); i++)
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if (*children_devices[i].is_enabled)
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count_devices++;
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if (!count_devices)
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return 0;
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for (i = 0; i < ARRAY_SIZE(children_devices); i++)
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if (*children_devices[i].is_enabled)
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minchannels +=
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children_devices[i].audio_driver->minchannels;
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if (minchannels < numchans) {
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extrachannels = numchans - minchannels;
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extrachannels_per_driver = extrachannels / count_devices;
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extrachannels_remainder = extrachannels % count_devices;
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}
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dev_dbg(device, "minchannels %d\n", minchannels);
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dev_dbg(device, "extrachannels %d\n", extrachannels);
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dev_dbg(device, "extrachannels_per_driver %d\n",
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extrachannels_per_driver);
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dev_dbg(device, "extrachannels_remainder %d\n",
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extrachannels_remainder);
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for (i = 0; i < ARRAY_SIZE(children_devices); i++) {
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struct bcm2835_audio_driver *audio_driver;
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int numchannels_this_device;
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int err;
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if (!*children_devices[i].is_enabled)
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continue;
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audio_driver = children_devices[i].audio_driver;
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if (audio_driver->minchannels > numchans) {
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dev_err(device,
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"Out of channels, needed %d but only %d left\n",
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audio_driver->minchannels,
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numchans);
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continue;
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}
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numchannels_this_device =
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audio_driver->minchannels + extrachannels_per_driver +
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extrachannels_remainder;
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extrachannels_remainder = 0;
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numchans -= numchannels_this_device;
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err = snd_add_child_device(device, audio_driver,
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numchannels_this_device);
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if (err)
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return err;
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}
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return 0;
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}
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static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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int err;
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if (num_channels <= 0 || num_channels > MAX_SUBSTREAMS) {
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num_channels = MAX_SUBSTREAMS;
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dev_warn(dev, "Illegal num_channels value, will use %u\n",
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num_channels);
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}
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err = bcm2835_devm_add_vchi_ctx(dev);
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if (err)
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return err;
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err = snd_add_child_devices(dev, num_channels);
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if (err)
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return err;
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return 0;
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}
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#ifdef CONFIG_PM
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static int snd_bcm2835_alsa_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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return 0;
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}
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static int snd_bcm2835_alsa_resume(struct platform_device *pdev)
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{
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return 0;
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}
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#endif
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static struct platform_driver bcm2835_alsa_driver = {
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.probe = snd_bcm2835_alsa_probe,
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#ifdef CONFIG_PM
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.suspend = snd_bcm2835_alsa_suspend,
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.resume = snd_bcm2835_alsa_resume,
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#endif
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.driver = {
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.name = "bcm2835_audio",
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},
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};
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module_platform_driver(bcm2835_alsa_driver);
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MODULE_AUTHOR("Dom Cobley");
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MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:bcm2835_audio");
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