473 lines
11 KiB
C
473 lines
11 KiB
C
/*****************************************************************************
|
|
* Copyright 2011 Broadcom Corporation. All rights reserved.
|
|
*
|
|
* Unless you and Broadcom execute a separate written software license
|
|
* agreement governing use of this software, this software is licensed to you
|
|
* under the terms of the GNU General Public License version 2, available at
|
|
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
|
|
*
|
|
* Notwithstanding the above, under no circumstances may you combine this
|
|
* software in any way with any other Broadcom software provided under a
|
|
* license other than the GPL, without Broadcom's express prior written
|
|
* consent.
|
|
*****************************************************************************/
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
|
|
#include "bcm2835.h"
|
|
|
|
static bool enable_hdmi;
|
|
static bool enable_headphones;
|
|
static bool enable_compat_alsa = true;
|
|
|
|
module_param(enable_hdmi, bool, 0444);
|
|
MODULE_PARM_DESC(enable_hdmi, "Enables HDMI virtual audio device");
|
|
module_param(enable_headphones, bool, 0444);
|
|
MODULE_PARM_DESC(enable_headphones, "Enables Headphones virtual audio device");
|
|
module_param(enable_compat_alsa, bool, 0444);
|
|
MODULE_PARM_DESC(enable_compat_alsa,
|
|
"Enables ALSA compatibility virtual audio device");
|
|
|
|
static void snd_devm_unregister_child(struct device *dev, void *res)
|
|
{
|
|
struct device *childdev = *(struct device **)res;
|
|
|
|
device_unregister(childdev);
|
|
}
|
|
|
|
static int snd_devm_add_child(struct device *dev, struct device *child)
|
|
{
|
|
struct device **dr;
|
|
int ret;
|
|
|
|
dr = devres_alloc(snd_devm_unregister_child, sizeof(*dr), GFP_KERNEL);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
ret = device_add(child);
|
|
if (ret) {
|
|
devres_free(dr);
|
|
return ret;
|
|
}
|
|
|
|
*dr = child;
|
|
devres_add(dev, dr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct device *
|
|
snd_create_device(struct device *parent,
|
|
struct device_driver *driver,
|
|
const char *name)
|
|
{
|
|
struct device *device;
|
|
int ret;
|
|
|
|
device = devm_kzalloc(parent, sizeof(*device), GFP_KERNEL);
|
|
if (!device)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
device_initialize(device);
|
|
device->parent = parent;
|
|
device->driver = driver;
|
|
|
|
dev_set_name(device, "%s", name);
|
|
|
|
ret = snd_devm_add_child(parent, device);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
return device;
|
|
}
|
|
|
|
static int snd_bcm2835_free(struct bcm2835_chip *chip)
|
|
{
|
|
kfree(chip);
|
|
return 0;
|
|
}
|
|
|
|
/* component-destructor
|
|
* (see "Management of Cards and Components")
|
|
*/
|
|
static int snd_bcm2835_dev_free(struct snd_device *device)
|
|
{
|
|
return snd_bcm2835_free(device->device_data);
|
|
}
|
|
|
|
/* chip-specific constructor
|
|
* (see "Management of Cards and Components")
|
|
*/
|
|
static int snd_bcm2835_create(struct snd_card *card,
|
|
struct bcm2835_chip **rchip)
|
|
{
|
|
struct bcm2835_chip *chip;
|
|
int err;
|
|
static struct snd_device_ops ops = {
|
|
.dev_free = snd_bcm2835_dev_free,
|
|
};
|
|
|
|
*rchip = NULL;
|
|
|
|
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
chip->card = card;
|
|
|
|
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
|
|
if (err) {
|
|
snd_bcm2835_free(chip);
|
|
return err;
|
|
}
|
|
|
|
*rchip = chip;
|
|
return 0;
|
|
}
|
|
|
|
static void snd_devm_card_free(struct device *dev, void *res)
|
|
{
|
|
struct snd_card *snd_card = *(struct snd_card **)res;
|
|
|
|
snd_card_free(snd_card);
|
|
}
|
|
|
|
static struct snd_card *snd_devm_card_new(struct device *dev)
|
|
{
|
|
struct snd_card **dr;
|
|
struct snd_card *card;
|
|
int ret;
|
|
|
|
dr = devres_alloc(snd_devm_card_free, sizeof(*dr), GFP_KERNEL);
|
|
if (!dr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = snd_card_new(dev, -1, NULL, THIS_MODULE, 0, &card);
|
|
if (ret) {
|
|
devres_free(dr);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
*dr = card;
|
|
devres_add(dev, dr);
|
|
|
|
return card;
|
|
}
|
|
|
|
typedef int (*bcm2835_audio_newpcm_func)(struct bcm2835_chip *chip,
|
|
const char *name,
|
|
enum snd_bcm2835_route route,
|
|
u32 numchannels);
|
|
|
|
typedef int (*bcm2835_audio_newctl_func)(struct bcm2835_chip *chip);
|
|
|
|
struct bcm2835_audio_driver {
|
|
struct device_driver driver;
|
|
const char *shortname;
|
|
const char *longname;
|
|
int minchannels;
|
|
bcm2835_audio_newpcm_func newpcm;
|
|
bcm2835_audio_newctl_func newctl;
|
|
enum snd_bcm2835_route route;
|
|
};
|
|
|
|
static int bcm2835_audio_alsa_newpcm(struct bcm2835_chip *chip,
|
|
const char *name,
|
|
enum snd_bcm2835_route route,
|
|
u32 numchannels)
|
|
{
|
|
int err;
|
|
|
|
err = snd_bcm2835_new_pcm(chip, numchannels - 1);
|
|
if (err)
|
|
return err;
|
|
|
|
err = snd_bcm2835_new_spdif_pcm(chip);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct bcm2835_audio_driver bcm2835_audio_alsa = {
|
|
.driver = {
|
|
.name = "bcm2835_alsa",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.shortname = "bcm2835 ALSA",
|
|
.longname = "bcm2835 ALSA",
|
|
.minchannels = 2,
|
|
.newpcm = bcm2835_audio_alsa_newpcm,
|
|
.newctl = snd_bcm2835_new_ctl,
|
|
};
|
|
|
|
static struct bcm2835_audio_driver bcm2835_audio_hdmi = {
|
|
.driver = {
|
|
.name = "bcm2835_hdmi",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.shortname = "bcm2835 HDMI",
|
|
.longname = "bcm2835 HDMI",
|
|
.minchannels = 1,
|
|
.newpcm = snd_bcm2835_new_simple_pcm,
|
|
.newctl = snd_bcm2835_new_hdmi_ctl,
|
|
.route = AUDIO_DEST_HDMI
|
|
};
|
|
|
|
static struct bcm2835_audio_driver bcm2835_audio_headphones = {
|
|
.driver = {
|
|
.name = "bcm2835_headphones",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.shortname = "bcm2835 Headphones",
|
|
.longname = "bcm2835 Headphones",
|
|
.minchannels = 1,
|
|
.newpcm = snd_bcm2835_new_simple_pcm,
|
|
.newctl = snd_bcm2835_new_headphones_ctl,
|
|
.route = AUDIO_DEST_HEADPHONES
|
|
};
|
|
|
|
struct bcm2835_audio_drivers {
|
|
struct bcm2835_audio_driver *audio_driver;
|
|
const bool *is_enabled;
|
|
};
|
|
|
|
static struct bcm2835_audio_drivers children_devices[] = {
|
|
{
|
|
.audio_driver = &bcm2835_audio_alsa,
|
|
.is_enabled = &enable_compat_alsa,
|
|
},
|
|
{
|
|
.audio_driver = &bcm2835_audio_hdmi,
|
|
.is_enabled = &enable_hdmi,
|
|
},
|
|
{
|
|
.audio_driver = &bcm2835_audio_headphones,
|
|
.is_enabled = &enable_headphones,
|
|
},
|
|
};
|
|
|
|
static int snd_add_child_device(struct device *device,
|
|
struct bcm2835_audio_driver *audio_driver,
|
|
u32 numchans)
|
|
{
|
|
struct snd_card *card;
|
|
struct device *child;
|
|
struct bcm2835_chip *chip;
|
|
int err, i;
|
|
|
|
child = snd_create_device(device, &audio_driver->driver,
|
|
audio_driver->driver.name);
|
|
if (IS_ERR(child)) {
|
|
dev_err(device,
|
|
"Unable to create child device %p, error %ld",
|
|
audio_driver->driver.name,
|
|
PTR_ERR(child));
|
|
return PTR_ERR(child);
|
|
}
|
|
|
|
card = snd_devm_card_new(child);
|
|
if (IS_ERR(card)) {
|
|
dev_err(child, "Failed to create card");
|
|
return PTR_ERR(card);
|
|
}
|
|
|
|
snd_card_set_dev(card, child);
|
|
strcpy(card->driver, audio_driver->driver.name);
|
|
strcpy(card->shortname, audio_driver->shortname);
|
|
strcpy(card->longname, audio_driver->longname);
|
|
|
|
err = snd_bcm2835_create(card, &chip);
|
|
if (err) {
|
|
dev_err(child, "Failed to create chip, error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
chip->dev = child;
|
|
|
|
err = audio_driver->newpcm(chip, audio_driver->shortname,
|
|
audio_driver->route,
|
|
numchans);
|
|
if (err) {
|
|
dev_err(child, "Failed to create pcm, error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = audio_driver->newctl(chip);
|
|
if (err) {
|
|
dev_err(child, "Failed to create controls, error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
for (i = 0; i < numchans; i++)
|
|
chip->avail_substreams |= (1 << i);
|
|
|
|
err = snd_card_register(card);
|
|
if (err) {
|
|
dev_err(child, "Failed to register card, error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
dev_set_drvdata(child, card);
|
|
dev_info(child, "card created with %d channels\n", numchans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_add_child_devices(struct device *device, u32 numchans)
|
|
{
|
|
int i;
|
|
int count_devices = 0;
|
|
int minchannels = 0;
|
|
int extrachannels = 0;
|
|
int extrachannels_per_driver = 0;
|
|
int extrachannels_remainder = 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(children_devices); i++)
|
|
if (*children_devices[i].is_enabled)
|
|
count_devices++;
|
|
|
|
if (!count_devices)
|
|
return 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(children_devices); i++)
|
|
if (*children_devices[i].is_enabled)
|
|
minchannels +=
|
|
children_devices[i].audio_driver->minchannels;
|
|
|
|
if (minchannels < numchans) {
|
|
extrachannels = numchans - minchannels;
|
|
extrachannels_per_driver = extrachannels / count_devices;
|
|
extrachannels_remainder = extrachannels % count_devices;
|
|
}
|
|
|
|
dev_dbg(device, "minchannels %d\n", minchannels);
|
|
dev_dbg(device, "extrachannels %d\n", extrachannels);
|
|
dev_dbg(device, "extrachannels_per_driver %d\n",
|
|
extrachannels_per_driver);
|
|
dev_dbg(device, "extrachannels_remainder %d\n",
|
|
extrachannels_remainder);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(children_devices); i++) {
|
|
int err;
|
|
int numchannels_this_device;
|
|
struct bcm2835_audio_driver *audio_driver;
|
|
|
|
if (!*children_devices[i].is_enabled)
|
|
continue;
|
|
|
|
audio_driver = children_devices[i].audio_driver;
|
|
|
|
if (audio_driver->minchannels > numchans) {
|
|
dev_err(device,
|
|
"Out of channels, needed %d but only %d left\n",
|
|
audio_driver->minchannels,
|
|
numchans);
|
|
continue;
|
|
}
|
|
|
|
numchannels_this_device =
|
|
audio_driver->minchannels + extrachannels_per_driver +
|
|
extrachannels_remainder;
|
|
extrachannels_remainder = 0;
|
|
|
|
numchans -= numchannels_this_device;
|
|
|
|
err = snd_add_child_device(device, audio_driver,
|
|
numchannels_this_device);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_bcm2835_alsa_probe_dt(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
u32 numchans;
|
|
int err;
|
|
|
|
err = of_property_read_u32(dev->of_node, "brcm,pwm-channels",
|
|
&numchans);
|
|
if (err) {
|
|
dev_err(dev, "Failed to get DT property 'brcm,pwm-channels'");
|
|
return err;
|
|
}
|
|
|
|
if (numchans == 0 || numchans > MAX_SUBSTREAMS) {
|
|
numchans = MAX_SUBSTREAMS;
|
|
dev_warn(dev,
|
|
"Illegal 'brcm,pwm-channels' value, will use %u\n",
|
|
numchans);
|
|
}
|
|
|
|
err = snd_add_child_devices(dev, numchans);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int snd_bcm2835_alsa_suspend(struct platform_device *pdev,
|
|
pm_message_t state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int snd_bcm2835_alsa_resume(struct platform_device *pdev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
static const struct of_device_id snd_bcm2835_of_match_table[] = {
|
|
{ .compatible = "brcm,bcm2835-audio",},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, snd_bcm2835_of_match_table);
|
|
|
|
static struct platform_driver bcm2835_alsa0_driver = {
|
|
.probe = snd_bcm2835_alsa_probe_dt,
|
|
#ifdef CONFIG_PM
|
|
.suspend = snd_bcm2835_alsa_suspend,
|
|
.resume = snd_bcm2835_alsa_resume,
|
|
#endif
|
|
.driver = {
|
|
.name = "bcm2835_audio",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = snd_bcm2835_of_match_table,
|
|
},
|
|
};
|
|
|
|
static int bcm2835_alsa_device_init(void)
|
|
{
|
|
int retval;
|
|
|
|
retval = platform_driver_register(&bcm2835_alsa0_driver);
|
|
if (retval)
|
|
pr_err("Error registering bcm2835_audio driver %d .\n", retval);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void bcm2835_alsa_device_exit(void)
|
|
{
|
|
platform_driver_unregister(&bcm2835_alsa0_driver);
|
|
}
|
|
|
|
late_initcall(bcm2835_alsa_device_init);
|
|
module_exit(bcm2835_alsa_device_exit);
|
|
|
|
MODULE_AUTHOR("Dom Cobley");
|
|
MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
|
|
MODULE_LICENSE("GPL");
|