[mirror_ubuntu-eoan-kernel.git] / sound / ac97 / bus.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
 */

#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <sound/ac97/codec.h>
#include <sound/ac97/controller.h>
#include <sound/ac97/regs.h>

#include "ac97_core.h"

/*
 * Protects ac97_controllers and each ac97_controller structure.
 */
static DEFINE_MUTEX(ac97_controllers_mutex);
static DEFINE_IDR(ac97_adapter_idr);
static LIST_HEAD(ac97_controllers);

static struct bus_type ac97_bus_type;

static inline struct ac97_controller*
to_ac97_controller(struct device *ac97_adapter)
{
	return container_of(ac97_adapter, struct ac97_controller, adap);
}

static int ac97_unbound_ctrl_write(struct ac97_controller *adrv, int slot,
		     unsigned short reg, unsigned short val)
{
	return -ENODEV;
}

static int ac97_unbound_ctrl_read(struct ac97_controller *adrv, int slot,
				  unsigned short reg)
{
	return -ENODEV;
}

static const struct ac97_controller_ops ac97_unbound_ctrl_ops = {
	.write = ac97_unbound_ctrl_write,
	.read = ac97_unbound_ctrl_read,
};

static struct ac97_controller ac97_unbound_ctrl = {
	.ops = &ac97_unbound_ctrl_ops,
};

static struct ac97_codec_device *
ac97_codec_find(struct ac97_controller *ac97_ctrl, unsigned int codec_num)
{
	if (codec_num >= AC97_BUS_MAX_CODECS)
		return ERR_PTR(-EINVAL);

	return ac97_ctrl->codecs[codec_num];
}

static struct device_node *
ac97_of_get_child_device(struct ac97_controller *ac97_ctrl, int idx,
			 unsigned int vendor_id)
{
	struct device_node *node;
	u32 reg;
	char compat[] = "ac97,0000,0000";

	snprintf(compat, sizeof(compat), "ac97,%04x,%04x",
		 vendor_id >> 16, vendor_id & 0xffff);

	for_each_child_of_node(ac97_ctrl->parent->of_node, node) {
		if ((idx != of_property_read_u32(node, "reg", &reg)) ||
		    !of_device_is_compatible(node, compat))
			continue;
		return node;
	}

	return NULL;
}

static void ac97_codec_release(struct device *dev)
{
	struct ac97_codec_device *adev;
	struct ac97_controller *ac97_ctrl;

	adev = to_ac97_device(dev);
	ac97_ctrl = adev->ac97_ctrl;
	ac97_ctrl->codecs[adev->num] = NULL;
	of_node_put(dev->of_node);
	kfree(adev);
}

static int ac97_codec_add(struct ac97_controller *ac97_ctrl, int idx,
		   unsigned int vendor_id)
{
	struct ac97_codec_device *codec;
	int ret;

	codec = kzalloc(sizeof(*codec), GFP_KERNEL);
	if (!codec)
		return -ENOMEM;
	ac97_ctrl->codecs[idx] = codec;
	codec->vendor_id = vendor_id;
	codec->dev.release = ac97_codec_release;
	codec->dev.bus = &ac97_bus_type;
	codec->dev.parent = &ac97_ctrl->adap;
	codec->num = idx;
	codec->ac97_ctrl = ac97_ctrl;

	device_initialize(&codec->dev);
	dev_set_name(&codec->dev, "%s:%u", dev_name(ac97_ctrl->parent), idx);
	codec->dev.of_node = ac97_of_get_child_device(ac97_ctrl, idx,
						      vendor_id);

	ret = device_add(&codec->dev);
	if (ret)
		goto err_free_codec;

	return 0;
err_free_codec:
	of_node_put(codec->dev.of_node);
	put_device(&codec->dev);
	kfree(codec);
	ac97_ctrl->codecs[idx] = NULL;

	return ret;
}

unsigned int snd_ac97_bus_scan_one(struct ac97_controller *adrv,
				   unsigned int codec_num)
{
	unsigned short vid1, vid2;
	int ret;

	ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID1);
	vid1 = (ret & 0xffff);
	if (ret < 0)
		return 0;

	ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID2);
	vid2 = (ret & 0xffff);
	if (ret < 0)
		return 0;

	dev_dbg(&adrv->adap, "%s(codec_num=%u): vendor_id=0x%08x\n",
		__func__, codec_num, AC97_ID(vid1, vid2));
	return AC97_ID(vid1, vid2);
}

static int ac97_bus_scan(struct ac97_controller *ac97_ctrl)
{
	int ret, i;
	unsigned int vendor_id;

	for (i = 0; i < AC97_BUS_MAX_CODECS; i++) {
		if (ac97_codec_find(ac97_ctrl, i))
			continue;
		if (!(ac97_ctrl->slots_available & BIT(i)))
			continue;
		vendor_id = snd_ac97_bus_scan_one(ac97_ctrl, i);
		if (!vendor_id)
			continue;

		ret = ac97_codec_add(ac97_ctrl, i, vendor_id);
		if (ret < 0)
			return ret;
	}
	return 0;
}

static int ac97_bus_reset(struct ac97_controller *ac97_ctrl)
{
	ac97_ctrl->ops->reset(ac97_ctrl);

	return 0;
}

/**
 * snd_ac97_codec_driver_register - register an AC97 codec driver
 * @dev: AC97 driver codec to register
 *
 * Register an AC97 codec driver to the ac97 bus driver, aka. the AC97 digital
 * controller.
 *
 * Returns 0 on success or error code
 */
int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv)
{
	drv->driver.bus = &ac97_bus_type;
	return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_register);

/**
 * snd_ac97_codec_driver_unregister - unregister an AC97 codec driver
 * @dev: AC97 codec driver to unregister
 *
 * Unregister a previously registered ac97 codec driver.
 */
void snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_unregister);

/**
 * snd_ac97_codec_get_platdata - get platform_data
 * @adev: the ac97 codec device
 *
 * For legacy platforms, in order to have platform_data in codec drivers
 * available, while ac97 device are auto-created upon probe, this retrieves the
 * platdata which was setup on ac97 controller registration.
 *
 * Returns the platform data pointer
 */
void *snd_ac97_codec_get_platdata(const struct ac97_codec_device *adev)
{
	struct ac97_controller *ac97_ctrl = adev->ac97_ctrl;

	return ac97_ctrl->codecs_pdata[adev->num];
}
EXPORT_SYMBOL_GPL(snd_ac97_codec_get_platdata);

static void ac97_ctrl_codecs_unregister(struct ac97_controller *ac97_ctrl)
{
	int i;

	for (i = 0; i < AC97_BUS_MAX_CODECS; i++)
		if (ac97_ctrl->codecs[i]) {
			ac97_ctrl->codecs[i]->ac97_ctrl = &ac97_unbound_ctrl;
			device_unregister(&ac97_ctrl->codecs[i]->dev);
		}
}

static ssize_t cold_reset_store(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t len)
{
	struct ac97_controller *ac97_ctrl;

	mutex_lock(&ac97_controllers_mutex);
	ac97_ctrl = to_ac97_controller(dev);
	ac97_ctrl->ops->reset(ac97_ctrl);
	mutex_unlock(&ac97_controllers_mutex);
	return len;
}
static DEVICE_ATTR_WO(cold_reset);

static ssize_t warm_reset_store(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t len)
{
	struct ac97_controller *ac97_ctrl;

	if (!dev)
		return -ENODEV;

	mutex_lock(&ac97_controllers_mutex);
	ac97_ctrl = to_ac97_controller(dev);
	ac97_ctrl->ops->warm_reset(ac97_ctrl);
	mutex_unlock(&ac97_controllers_mutex);
	return len;
}
static DEVICE_ATTR_WO(warm_reset);

static struct attribute *ac97_controller_device_attrs[] = {
	&dev_attr_cold_reset.attr,
	&dev_attr_warm_reset.attr,
	NULL
};

static struct attribute_group ac97_adapter_attr_group = {
	.name	= "ac97_operations",
	.attrs	= ac97_controller_device_attrs,
};

static const struct attribute_group *ac97_adapter_groups[] = {
	&ac97_adapter_attr_group,
	NULL,
};

static void ac97_del_adapter(struct ac97_controller *ac97_ctrl)
{
	mutex_lock(&ac97_controllers_mutex);
	ac97_ctrl_codecs_unregister(ac97_ctrl);
	list_del(&ac97_ctrl->controllers);
	mutex_unlock(&ac97_controllers_mutex);

	device_unregister(&ac97_ctrl->adap);
}

static void ac97_adapter_release(struct device *dev)
{
	struct ac97_controller *ac97_ctrl;

	ac97_ctrl = to_ac97_controller(dev);
	idr_remove(&ac97_adapter_idr, ac97_ctrl->nr);
	dev_dbg(&ac97_ctrl->adap, "adapter unregistered by %s\n",
		dev_name(ac97_ctrl->parent));
}

static const struct device_type ac97_adapter_type = {
	.groups		= ac97_adapter_groups,
	.release	= ac97_adapter_release,
};

static int ac97_add_adapter(struct ac97_controller *ac97_ctrl)
{
	int ret;

	mutex_lock(&ac97_controllers_mutex);
	ret = idr_alloc(&ac97_adapter_idr, ac97_ctrl, 0, 0, GFP_KERNEL);
	ac97_ctrl->nr = ret;
	if (ret >= 0) {
		dev_set_name(&ac97_ctrl->adap, "ac97-%d", ret);
		ac97_ctrl->adap.type = &ac97_adapter_type;
		ac97_ctrl->adap.parent = ac97_ctrl->parent;
		ret = device_register(&ac97_ctrl->adap);
		if (ret)
			put_device(&ac97_ctrl->adap);
	}
	if (!ret)
		list_add(&ac97_ctrl->controllers, &ac97_controllers);
	mutex_unlock(&ac97_controllers_mutex);

	if (!ret)
		dev_dbg(&ac97_ctrl->adap, "adapter registered by %s\n",
			dev_name(ac97_ctrl->parent));
	return ret;
}

/**
 * snd_ac97_controller_register - register an ac97 controller
 * @ops: the ac97 bus operations
 * @dev: the device providing the ac97 DC function
 * @slots_available: mask of the ac97 codecs that can be scanned and probed
 *                   bit0 => codec 0, bit1 => codec 1 ... bit 3 => codec 3
 *
 * Register a digital controller which can control up to 4 ac97 codecs. This is
 * the controller side of the AC97 AC-link, while the slave side are the codecs.
 *
 * Returns a valid controller upon success, negative pointer value upon error
 */
struct ac97_controller *snd_ac97_controller_register(
	const struct ac97_controller_ops *ops, struct device *dev,
	unsigned short slots_available, void **codecs_pdata)
{
	struct ac97_controller *ac97_ctrl;
	int ret, i;

	ac97_ctrl = kzalloc(sizeof(*ac97_ctrl), GFP_KERNEL);
	if (!ac97_ctrl)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < AC97_BUS_MAX_CODECS && codecs_pdata; i++)
		ac97_ctrl->codecs_pdata[i] = codecs_pdata[i];

	ac97_ctrl->ops = ops;
	ac97_ctrl->slots_available = slots_available;
	ac97_ctrl->parent = dev;
	ret = ac97_add_adapter(ac97_ctrl);

	if (ret)
		goto err;
	ac97_bus_reset(ac97_ctrl);
	ac97_bus_scan(ac97_ctrl);

	return ac97_ctrl;
err:
	kfree(ac97_ctrl);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(snd_ac97_controller_register);

/**
 * snd_ac97_controller_unregister - unregister an ac97 controller
 * @ac97_ctrl: the device previously provided to ac97_controller_register()
 *
 */
void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
{
	ac97_del_adapter(ac97_ctrl);
}
EXPORT_SYMBOL_GPL(snd_ac97_controller_unregister);

#ifdef CONFIG_PM
static int ac97_pm_runtime_suspend(struct device *dev)
{
	struct ac97_codec_device *codec = to_ac97_device(dev);
	int ret = pm_generic_runtime_suspend(dev);

	if (ret == 0 && dev->driver) {
		if (pm_runtime_is_irq_safe(dev))
			clk_disable(codec->clk);
		else
			clk_disable_unprepare(codec->clk);
	}

	return ret;
}

static int ac97_pm_runtime_resume(struct device *dev)
{
	struct ac97_codec_device *codec = to_ac97_device(dev);
	int ret;

	if (dev->driver) {
		if (pm_runtime_is_irq_safe(dev))
			ret = clk_enable(codec->clk);
		else
			ret = clk_prepare_enable(codec->clk);
		if (ret)
			return ret;
	}

	return pm_generic_runtime_resume(dev);
}
#endif /* CONFIG_PM */

static const struct dev_pm_ops ac97_pm = {
	.suspend	= pm_generic_suspend,
	.resume		= pm_generic_resume,
	.freeze		= pm_generic_freeze,
	.thaw		= pm_generic_thaw,
	.poweroff	= pm_generic_poweroff,
	.restore	= pm_generic_restore,
	SET_RUNTIME_PM_OPS(
		ac97_pm_runtime_suspend,
		ac97_pm_runtime_resume,
		NULL)
};

static int ac97_get_enable_clk(struct ac97_codec_device *adev)
{
	int ret;

	adev->clk = clk_get(&adev->dev, "ac97_clk");
	if (IS_ERR(adev->clk))
		return PTR_ERR(adev->clk);

	ret = clk_prepare_enable(adev->clk);
	if (ret)
		clk_put(adev->clk);

	return ret;
}

static void ac97_put_disable_clk(struct ac97_codec_device *adev)
{
	clk_disable_unprepare(adev->clk);
	clk_put(adev->clk);
}

static ssize_t vendor_id_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct ac97_codec_device *codec = to_ac97_device(dev);

	return sprintf(buf, "%08x", codec->vendor_id);
}
DEVICE_ATTR_RO(vendor_id);

static struct attribute *ac97_dev_attrs[] = {
	&dev_attr_vendor_id.attr,
	NULL,
};
ATTRIBUTE_GROUPS(ac97_dev);

static int ac97_bus_match(struct device *dev, struct device_driver *drv)
{
	struct ac97_codec_device *adev = to_ac97_device(dev);
	struct ac97_codec_driver *adrv = to_ac97_driver(drv);
	const struct ac97_id *id = adrv->id_table;
	int i = 0;

	if (adev->vendor_id == 0x0 || adev->vendor_id == 0xffffffff)
		return false;

	do {
		if (ac97_ids_match(id[i].id, adev->vendor_id, id[i].mask))
			return true;
	} while (id[i++].id);

	return false;
}

static int ac97_bus_probe(struct device *dev)
{
	struct ac97_codec_device *adev = to_ac97_device(dev);
	struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
	int ret;

	ret = ac97_get_enable_clk(adev);
	if (ret)
		return ret;

	pm_runtime_get_noresume(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	ret = adrv->probe(adev);
	if (ret == 0)
		return 0;

	pm_runtime_disable(dev);
	pm_runtime_set_suspended(dev);
	pm_runtime_put_noidle(dev);
	ac97_put_disable_clk(adev);

	return ret;
}

static int ac97_bus_remove(struct device *dev)
{
	struct ac97_codec_device *adev = to_ac97_device(dev);
	struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
	int ret;

	ret = pm_runtime_get_sync(dev);
	if (ret < 0)
		return ret;

	ret = adrv->remove(adev);
	pm_runtime_put_noidle(dev);
	if (ret == 0)
		ac97_put_disable_clk(adev);

	pm_runtime_disable(dev);

	return ret;
}

static struct bus_type ac97_bus_type = {
	.name		= "ac97bus",
	.dev_groups	= ac97_dev_groups,
	.match		= ac97_bus_match,
	.pm		= &ac97_pm,
	.probe		= ac97_bus_probe,
	.remove		= ac97_bus_remove,
};

static int __init ac97_bus_init(void)
{
	return bus_register(&ac97_bus_type);
}
subsys_initcall(ac97_bus_init);

static void __exit ac97_bus_exit(void)
{
	bus_unregister(&ac97_bus_type);
}
module_exit(ac97_bus_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
74426fbf RJ	2	/*
74426fbf RJ	3	* Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
74426fbf RJ	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/bitops.h>
	8	#include <linux/clk.h>
	9	#include <linux/device.h>
	10	#include <linux/idr.h>
	11	#include <linux/list.h>
	12	#include <linux/mutex.h>
2225a3e6	13	#include <linux/of.h>
74426fbf RJ	14	#include <linux/pm.h>
	15	#include <linux/pm_runtime.h>
	16	#include <linux/slab.h>
	17	#include <linux/sysfs.h>
	18	#include <sound/ac97/codec.h>
	19	#include <sound/ac97/controller.h>
	20	#include <sound/ac97/regs.h>
	21
	22	#include "ac97_core.h"
	23
	24	/*
	25	* Protects ac97_controllers and each ac97_controller structure.
	26	*/
	27	static DEFINE_MUTEX(ac97_controllers_mutex);
	28	static DEFINE_IDR(ac97_adapter_idr);
	29	static LIST_HEAD(ac97_controllers);
	30
	31	static struct bus_type ac97_bus_type;
	32
	33	static inline struct ac97_controller*
	34	to_ac97_controller(struct device *ac97_adapter)
	35	{
	36	return container_of(ac97_adapter, struct ac97_controller, adap);
	37	}
	38
	39	static int ac97_unbound_ctrl_write(struct ac97_controller *adrv, int slot,
	40	unsigned short reg, unsigned short val)
	41	{
	42	return -ENODEV;
	43	}
	44
	45	static int ac97_unbound_ctrl_read(struct ac97_controller *adrv, int slot,
	46	unsigned short reg)
	47	{
	48	return -ENODEV;
	49	}
	50
	51	static const struct ac97_controller_ops ac97_unbound_ctrl_ops = {
	52	.write = ac97_unbound_ctrl_write,
	53	.read = ac97_unbound_ctrl_read,
	54	};
	55
	56	static struct ac97_controller ac97_unbound_ctrl = {
	57	.ops = &ac97_unbound_ctrl_ops,
	58	};
	59
	60	static struct ac97_codec_device *
	61	ac97_codec_find(struct ac97_controller *ac97_ctrl, unsigned int codec_num)
	62	{
	63	if (codec_num >= AC97_BUS_MAX_CODECS)
	64	return ERR_PTR(-EINVAL);
	65
	66	return ac97_ctrl->codecs[codec_num];
	67	}
	68
2225a3e6 RJ	69	static struct device_node *
	70	ac97_of_get_child_device(struct ac97_controller *ac97_ctrl, int idx,
	71	unsigned int vendor_id)
	72	{
	73	struct device_node *node;
	74	u32 reg;
	75	char compat[] = "ac97,0000,0000";
	76
	77	snprintf(compat, sizeof(compat), "ac97,%04x,%04x",
	78	vendor_id >> 16, vendor_id & 0xffff);
	79
	80	for_each_child_of_node(ac97_ctrl->parent->of_node, node) {
	81	if ((idx != of_property_read_u32(node, "reg", &reg)) \|\|
	82	!of_device_is_compatible(node, compat))
	83	continue;
31d2350d	84	return node;
2225a3e6 RJ	85	}
	86
	87	return NULL;
	88	}
	89
74426fbf RJ	90	static void ac97_codec_release(struct device *dev)
	91	{
	92	struct ac97_codec_device *adev;
	93	struct ac97_controller *ac97_ctrl;
	94
	95	adev = to_ac97_device(dev);
	96	ac97_ctrl = adev->ac97_ctrl;
	97	ac97_ctrl->codecs[adev->num] = NULL;
2225a3e6	98	of_node_put(dev->of_node);
74426fbf RJ	99	kfree(adev);
	100	}
	101
	102	static int ac97_codec_add(struct ac97_controller *ac97_ctrl, int idx,
	103	unsigned int vendor_id)
	104	{
	105	struct ac97_codec_device *codec;
	106	int ret;
	107
	108	codec = kzalloc(sizeof(*codec), GFP_KERNEL);
	109	if (!codec)
	110	return -ENOMEM;
	111	ac97_ctrl->codecs[idx] = codec;
	112	codec->vendor_id = vendor_id;
	113	codec->dev.release = ac97_codec_release;
	114	codec->dev.bus = &ac97_bus_type;
	115	codec->dev.parent = &ac97_ctrl->adap;
	116	codec->num = idx;
	117	codec->ac97_ctrl = ac97_ctrl;
	118
	119	device_initialize(&codec->dev);
	120	dev_set_name(&codec->dev, "%s:%u", dev_name(ac97_ctrl->parent), idx);
2225a3e6 RJ	121	codec->dev.of_node = ac97_of_get_child_device(ac97_ctrl, idx,
2225a3e6 RJ	122	vendor_id);
74426fbf RJ	123
	124	ret = device_add(&codec->dev);
	125	if (ret)
	126	goto err_free_codec;
	127
	128	return 0;
	129	err_free_codec:
2225a3e6	130	of_node_put(codec->dev.of_node);
74426fbf RJ	131	put_device(&codec->dev);
	132	kfree(codec);
	133	ac97_ctrl->codecs[idx] = NULL;
	134
	135	return ret;
	136	}
	137
	138	unsigned int snd_ac97_bus_scan_one(struct ac97_controller *adrv,
	139	unsigned int codec_num)
	140	{
	141	unsigned short vid1, vid2;
	142	int ret;
	143
	144	ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID1);
	145	vid1 = (ret & 0xffff);
	146	if (ret < 0)
	147	return 0;
	148
	149	ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID2);
	150	vid2 = (ret & 0xffff);
	151	if (ret < 0)
	152	return 0;
	153
	154	dev_dbg(&adrv->adap, "%s(codec_num=%u): vendor_id=0x%08x\n",
	155	__func__, codec_num, AC97_ID(vid1, vid2));
	156	return AC97_ID(vid1, vid2);
	157	}
	158
	159	static int ac97_bus_scan(struct ac97_controller *ac97_ctrl)
	160	{
	161	int ret, i;
	162	unsigned int vendor_id;
	163
	164	for (i = 0; i < AC97_BUS_MAX_CODECS; i++) {
	165	if (ac97_codec_find(ac97_ctrl, i))
	166	continue;
	167	if (!(ac97_ctrl->slots_available & BIT(i)))
	168	continue;
	169	vendor_id = snd_ac97_bus_scan_one(ac97_ctrl, i);
	170	if (!vendor_id)
	171	continue;
	172
	173	ret = ac97_codec_add(ac97_ctrl, i, vendor_id);
	174	if (ret < 0)
	175	return ret;
	176	}
	177	return 0;
	178	}
	179
	180	static int ac97_bus_reset(struct ac97_controller *ac97_ctrl)
	181	{
	182	ac97_ctrl->ops->reset(ac97_ctrl);
	183
	184	return 0;
	185	}
	186
	187	/**
	188	* snd_ac97_codec_driver_register - register an AC97 codec driver
	189	* @dev: AC97 driver codec to register
	190	*
	191	* Register an AC97 codec driver to the ac97 bus driver, aka. the AC97 digital
	192	* controller.
	193	*
	194	* Returns 0 on success or error code
195	*/
196	int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv)
197	{
198	drv->driver.bus = &ac97_bus_type;
199	return driver_register(&drv->driver);
200	}
201	EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_register);
202
203	/**
204	* snd_ac97_codec_driver_unregister - unregister an AC97 codec driver
205	* @dev: AC97 codec driver to unregister
206	*
207	* Unregister a previously registered ac97 codec driver.
208	*/
209	void snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv)
210	{
211	driver_unregister(&drv->driver);
212	}
213	EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_unregister);
214
215	/**
216	* snd_ac97_codec_get_platdata - get platform_data
217	* @adev: the ac97 codec device
218	*
219	* For legacy platforms, in order to have platform_data in codec drivers
220	* available, while ac97 device are auto-created upon probe, this retrieves the
221	* platdata which was setup on ac97 controller registration.
222	*
223	* Returns the platform data pointer
224	*/
225	void snd_ac97_codec_get_platdata(const struct ac97_codec_device adev)
226	{
227	struct ac97_controller *ac97_ctrl = adev->ac97_ctrl;
228
229	return ac97_ctrl->codecs_pdata[adev->num];
230	}
231	EXPORT_SYMBOL_GPL(snd_ac97_codec_get_platdata);
232
233	static void ac97_ctrl_codecs_unregister(struct ac97_controller *ac97_ctrl)
234	{
235	int i;
236
237	for (i = 0; i < AC97_BUS_MAX_CODECS; i++)
238	if (ac97_ctrl->codecs[i]) {
239	ac97_ctrl->codecs[i]->ac97_ctrl = &ac97_unbound_ctrl;
240	device_unregister(&ac97_ctrl->codecs[i]->dev);
241	}
242	}
243
244	static ssize_t cold_reset_store(struct device *dev,
245	struct device_attribute attr, const char buf,
246	size_t len)
247	{
248	struct ac97_controller *ac97_ctrl;
249
250	mutex_lock(&ac97_controllers_mutex);
251	ac97_ctrl = to_ac97_controller(dev);
252	ac97_ctrl->ops->reset(ac97_ctrl);
253	mutex_unlock(&ac97_controllers_mutex);
254	return len;
255	}
256	static DEVICE_ATTR_WO(cold_reset);
257
258	static ssize_t warm_reset_store(struct device *dev,
259	struct device_attribute attr, const char buf,
260	size_t len)
261	{
262	struct ac97_controller *ac97_ctrl;
263
264	if (!dev)
265	return -ENODEV;
266
267	mutex_lock(&ac97_controllers_mutex);
268	ac97_ctrl = to_ac97_controller(dev);
269	ac97_ctrl->ops->warm_reset(ac97_ctrl);
270	mutex_unlock(&ac97_controllers_mutex);
271	return len;
272	}
273	static DEVICE_ATTR_WO(warm_reset);
274
275	static struct attribute *ac97_controller_device_attrs[] = {
276	&dev_attr_cold_reset.attr,
277	&dev_attr_warm_reset.attr,
278	NULL
279	};
280
281	static struct attribute_group ac97_adapter_attr_group = {
282	.name = "ac97_operations",
283	.attrs = ac97_controller_device_attrs,
284	};
285
286	static const struct attribute_group *ac97_adapter_groups[] = {
287	&ac97_adapter_attr_group,
288	NULL,
289	};
290
291	static void ac97_del_adapter(struct ac97_controller *ac97_ctrl)
292	{
293	mutex_lock(&ac97_controllers_mutex);
294	ac97_ctrl_codecs_unregister(ac97_ctrl);
295	list_del(&ac97_ctrl->controllers);
296	mutex_unlock(&ac97_controllers_mutex);
297
298	device_unregister(&ac97_ctrl->adap);
299	}
300
301	static void ac97_adapter_release(struct device *dev)
302	{
303	struct ac97_controller *ac97_ctrl;
304
305	ac97_ctrl = to_ac97_controller(dev);
306	idr_remove(&ac97_adapter_idr, ac97_ctrl->nr);
307	dev_dbg(&ac97_ctrl->adap, "adapter unregistered by %s\n",
308	dev_name(ac97_ctrl->parent));
309	}
310
311	static const struct device_type ac97_adapter_type = {
312	.groups = ac97_adapter_groups,
313	.release = ac97_adapter_release,
314	};
315
316	static int ac97_add_adapter(struct ac97_controller *ac97_ctrl)
317	{
318	int ret;
319
320	mutex_lock(&ac97_controllers_mutex);
321	ret = idr_alloc(&ac97_adapter_idr, ac97_ctrl, 0, 0, GFP_KERNEL);
322	ac97_ctrl->nr = ret;
323	if (ret >= 0) {
324	dev_set_name(&ac97_ctrl->adap, "ac97-%d", ret);
325	ac97_ctrl->adap.type = &ac97_adapter_type;
326	ac97_ctrl->adap.parent = ac97_ctrl->parent;
327	ret = device_register(&ac97_ctrl->adap);
328	if (ret)
329	put_device(&ac97_ctrl->adap);
330	}
331	if (!ret)
332	list_add(&ac97_ctrl->controllers, &ac97_controllers);
333	mutex_unlock(&ac97_controllers_mutex);
334
335	if (!ret)
336	dev_dbg(&ac97_ctrl->adap, "adapter registered by %s\n",
337	dev_name(ac97_ctrl->parent));
338	return ret;
339	}
340
341	/**
342	* snd_ac97_controller_register - register an ac97 controller
343	* @ops: the ac97 bus operations
344	* @dev: the device providing the ac97 DC function
345	* @slots_available: mask of the ac97 codecs that can be scanned and probed
346	* bit0 => codec 0, bit1 => codec 1 ... bit 3 => codec 3
347	*
348	* Register a digital controller which can control up to 4 ac97 codecs. This is
349	* the controller side of the AC97 AC-link, while the slave side are the codecs.
350	*
351	* Returns a valid controller upon success, negative pointer value upon error
352	*/
353	struct ac97_controller *snd_ac97_controller_register(
354	const struct ac97_controller_ops ops, struct device dev,
355	unsigned short slots_available, void **codecs_pdata)
356	{
357	struct ac97_controller *ac97_ctrl;
358	int ret, i;
359
360	ac97_ctrl = kzalloc(sizeof(*ac97_ctrl), GFP_KERNEL);
361	if (!ac97_ctrl)
362	return ERR_PTR(-ENOMEM);
363
364	for (i = 0; i < AC97_BUS_MAX_CODECS && codecs_pdata; i++)
365	ac97_ctrl->codecs_pdata[i] = codecs_pdata[i];
366
367	ac97_ctrl->ops = ops;
368	ac97_ctrl->slots_available = slots_available;
369	ac97_ctrl->parent = dev;
370	ret = ac97_add_adapter(ac97_ctrl);
371
372	if (ret)
373	goto err;
374	ac97_bus_reset(ac97_ctrl);
375	ac97_bus_scan(ac97_ctrl);
376
377	return ac97_ctrl;
378	err:
379	kfree(ac97_ctrl);
380	return ERR_PTR(ret);
381	}
382	EXPORT_SYMBOL_GPL(snd_ac97_controller_register);
383
384	/**
385	* snd_ac97_controller_unregister - unregister an ac97 controller
386	* @ac97_ctrl: the device previously provided to ac97_controller_register()
387	*
388	*/
389	void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
390	{
391	ac97_del_adapter(ac97_ctrl);
392	}
393	EXPORT_SYMBOL_GPL(snd_ac97_controller_unregister);
394
395	#ifdef CONFIG_PM
396	static int ac97_pm_runtime_suspend(struct device *dev)
397	{
398	struct ac97_codec_device *codec = to_ac97_device(dev);
399	int ret = pm_generic_runtime_suspend(dev);
400
401	if (ret == 0 && dev->driver) {
402	if (pm_runtime_is_irq_safe(dev))
403	clk_disable(codec->clk);
404	else
405	clk_disable_unprepare(codec->clk);
406	}
407
408	return ret;
409	}
410
411	static int ac97_pm_runtime_resume(struct device *dev)
412	{
413	struct ac97_codec_device *codec = to_ac97_device(dev);
414	int ret;
415
416	if (dev->driver) {
417	if (pm_runtime_is_irq_safe(dev))
418	ret = clk_enable(codec->clk);
419	else
420	ret = clk_prepare_enable(codec->clk);
421	if (ret)
422	return ret;
423	}
424
425	return pm_generic_runtime_resume(dev);
426	}
427	#endif /* CONFIG_PM */
428
429	static const struct dev_pm_ops ac97_pm = {
430	.suspend = pm_generic_suspend,
431	.resume = pm_generic_resume,
432	.freeze = pm_generic_freeze,
433	.thaw = pm_generic_thaw,
434	.poweroff = pm_generic_poweroff,
435	.restore = pm_generic_restore,
436	SET_RUNTIME_PM_OPS(
437	ac97_pm_runtime_suspend,
438	ac97_pm_runtime_resume,
439	NULL)
440	};
441
442	static int ac97_get_enable_clk(struct ac97_codec_device *adev)
443	{
444	int ret;
445
446	adev->clk = clk_get(&adev->dev, "ac97_clk");
447	if (IS_ERR(adev->clk))
448	return PTR_ERR(adev->clk);
449
450	ret = clk_prepare_enable(adev->clk);
451	if (ret)
452	clk_put(adev->clk);
453
454	return ret;
455	}
456
457	static void ac97_put_disable_clk(struct ac97_codec_device *adev)
458	{
459	clk_disable_unprepare(adev->clk);
460	clk_put(adev->clk);
461	}
462
463	static ssize_t vendor_id_show(struct device *dev,
464	struct device_attribute attr, char buf)
465	{
466	struct ac97_codec_device *codec = to_ac97_device(dev);
467
468	return sprintf(buf, "%08x", codec->vendor_id);
469	}
470	DEVICE_ATTR_RO(vendor_id);
471
472	static struct attribute *ac97_dev_attrs[] = {
473	&dev_attr_vendor_id.attr,
474	NULL,
475	};
476	ATTRIBUTE_GROUPS(ac97_dev);
477
478	static int ac97_bus_match(struct device dev, struct device_driver drv)
479	{
480	struct ac97_codec_device *adev = to_ac97_device(dev);
481	struct ac97_codec_driver *adrv = to_ac97_driver(drv);
482	const struct ac97_id *id = adrv->id_table;
483	int i = 0;
484
485	if (adev->vendor_id == 0x0 \|\| adev->vendor_id == 0xffffffff)
486	return false;
487
488	do {
489	if (ac97_ids_match(id[i].id, adev->vendor_id, id[i].mask))
490	return true;
491	} while (id[i++].id);
492
493	return false;
494	}
495
496	static int ac97_bus_probe(struct device *dev)
497	{
498	struct ac97_codec_device *adev = to_ac97_device(dev);
499	struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
500	int ret;
501
502	ret = ac97_get_enable_clk(adev);
503	if (ret)
504	return ret;
505
506	pm_runtime_get_noresume(dev);
507	pm_runtime_set_active(dev);
508	pm_runtime_enable(dev);
509
510	ret = adrv->probe(adev);
511	if (ret == 0)
512	return 0;
513
514	pm_runtime_disable(dev);
515	pm_runtime_set_suspended(dev);
516	pm_runtime_put_noidle(dev);
517	ac97_put_disable_clk(adev);
518
519	return ret;
520	}
521
522	static int ac97_bus_remove(struct device *dev)
523	{
524	struct ac97_codec_device *adev = to_ac97_device(dev);
525	struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
526	int ret;
527
528	ret = pm_runtime_get_sync(dev);
d15ec0b4	529	if (ret < 0)
74426fbf RJ	530	return ret;
	531
	532	ret = adrv->remove(adev);
	533	pm_runtime_put_noidle(dev);
	534	if (ret == 0)
	535	ac97_put_disable_clk(adev);
	536
250ea7c5 LY	537	pm_runtime_disable(dev);
250ea7c5 LY	538
74426fbf RJ	539	return ret;
	540	}
	541
	542	static struct bus_type ac97_bus_type = {
	543	.name = "ac97bus",
	544	.dev_groups = ac97_dev_groups,
	545	.match = ac97_bus_match,
	546	.pm = &ac97_pm,
	547	.probe = ac97_bus_probe,
	548	.remove = ac97_bus_remove,
	549	};
	550
	551	static int __init ac97_bus_init(void)
	552	{
	553	return bus_register(&ac97_bus_type);
	554	}
	555	subsys_initcall(ac97_bus_init);
	556
	557	static void __exit ac97_bus_exit(void)
	558	{
	559	bus_unregister(&ac97_bus_type);
	560	}
	561	module_exit(ac97_bus_exit);
	562
	563	MODULE_LICENSE("GPL");
	564	MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");