1 files changed, 472 insertions, 0 deletions
diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
new file mode 100644
index 000000000000..8f2d508183b2
--- /dev/null
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -0,0 +1,472 @@
+/*****************************************************************************
+ * 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");