[deliverable/linux.git] / sound / hda / hdac_device.c

/*
 * HD-audio codec core device
 */

#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/pm_runtime.h>
#include <sound/hdaudio.h>
#include "local.h"

static void setup_fg_nodes(struct hdac_device *codec);
static int get_codec_vendor_name(struct hdac_device *codec);

static void default_release(struct device *dev)
{
	snd_hdac_device_exit(container_of(dev, struct hdac_device, dev));
}

/**
 * snd_hdac_device_init - initialize the HD-audio codec base device
 * @codec: device to initialize
 * @bus: but to attach
 * @name: device name string
 * @addr: codec address
 *
 * Returns zero for success or a negative error code.
 *
 * This function increments the runtime PM counter and marks it active.
 * The caller needs to turn it off appropriately later.
 *
 * The caller needs to set the device's release op properly by itself.
 */
int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
			 const char *name, unsigned int addr)
{
	struct device *dev;
	hda_nid_t fg;
	int err;

	dev = &codec->dev;
	device_initialize(dev);
	dev->parent = bus->dev;
	dev->bus = &snd_hda_bus_type;
	dev->release = default_release;
	dev_set_name(dev, "%s", name);
	device_enable_async_suspend(dev);

	codec->bus = bus;
	codec->addr = addr;
	codec->type = HDA_DEV_CORE;
	pm_runtime_set_active(&codec->dev);
	pm_runtime_get_noresume(&codec->dev);
	atomic_set(&codec->in_pm, 0);

	err = snd_hdac_bus_add_device(bus, codec);
	if (err < 0)
		goto error;

	/* fill parameters */
	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
					      AC_PAR_VENDOR_ID);
	if (codec->vendor_id == -1) {
		/* read again, hopefully the access method was corrected
		 * in the last read...
		 */
		codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						      AC_PAR_VENDOR_ID);
	}

	codec->subsystem_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						 AC_PAR_SUBSYSTEM_ID);
	codec->revision_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						AC_PAR_REV_ID);

	setup_fg_nodes(codec);
	if (!codec->afg && !codec->mfg) {
		dev_err(dev, "no AFG or MFG node found\n");
		err = -ENODEV;
		goto error;
	}

	fg = codec->afg ? codec->afg : codec->mfg;

	err = snd_hdac_refresh_widgets(codec);
	if (err < 0)
		goto error;

	codec->power_caps = snd_hdac_read_parm(codec, fg, AC_PAR_POWER_STATE);
	/* reread ssid if not set by parameter */
	if (codec->subsystem_id == -1)
		snd_hdac_read(codec, fg, AC_VERB_GET_SUBSYSTEM_ID, 0,
			      &codec->subsystem_id);

	err = get_codec_vendor_name(codec);
	if (err < 0)
		goto error;

	codec->chip_name = kasprintf(GFP_KERNEL, "ID %x",
				     codec->vendor_id & 0xffff);
	if (!codec->chip_name) {
		err = -ENOMEM;
		goto error;
	}

	return 0;

 error:
	pm_runtime_put_noidle(&codec->dev);
	put_device(&codec->dev);
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_init);

/**
 * snd_hdac_device_exit - clean up the HD-audio codec base device
 * @codec: device to clean up
 */
void snd_hdac_device_exit(struct hdac_device *codec)
{
	/* pm_runtime_put_noidle(&codec->dev); */
	snd_hdac_bus_remove_device(codec->bus, codec);
	kfree(codec->vendor_name);
	kfree(codec->chip_name);
}
EXPORT_SYMBOL_GPL(snd_hdac_device_exit);

/**
 * snd_hdac_make_cmd - compose a 32bit command word to be sent to the
 *	HD-audio controller
 * @codec: the codec object
 * @nid: NID to encode
 * @verb: verb to encode
 * @parm: parameter to encode
 *
 * Return an encoded command verb or -1 for error.
 */
unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
			       unsigned int verb, unsigned int parm)
{
	u32 val, addr;

	addr = codec->addr;
	if ((addr & ~0xf) || (nid & ~0x7f) ||
	    (verb & ~0xfff) || (parm & ~0xffff)) {
		dev_err(&codec->dev, "out of range cmd %x:%x:%x:%x\n",
			addr, nid, verb, parm);
		return -1;
	}

	val = addr << 28;
	val |= (u32)nid << 20;
	val |= verb << 8;
	val |= parm;
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_make_cmd);

/**
 * snd_hdac_read - execute a verb
 * @codec: the codec object
 * @nid: NID to execute a verb
 * @verb: verb to execute
 * @parm: parameter for a verb
 * @res: the pointer to store the result, NULL if running async
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
		  unsigned int verb, unsigned int parm, unsigned int *res)
{
	unsigned int cmd = snd_hdac_make_cmd(codec, nid, verb, parm);

	return snd_hdac_bus_exec_verb(codec->bus, codec->addr, cmd, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_read);

/**
 * snd_hdac_read_parm - read a codec parameter
 * @codec: the codec object
 * @nid: NID to read a parameter
 * @parm: parameter to read
 *
 * Returns -1 for error.  If you need to distinguish the error more
 * strictly, use snd_hdac_read() directly.
 */
int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm)
{
	int val;

	if (snd_hdac_read(codec, nid, AC_VERB_PARAMETERS, parm, &val))
		return -1;
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_read_parm);

/**
 * snd_hdac_get_sub_nodes - get start NID and number of subtree nodes
 * @codec: the codec object
 * @nid: NID to inspect
 * @start_id: the pointer to store the starting NID
 *
 * Returns the number of subtree nodes or zero if not found.
 */
int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
			   hda_nid_t *start_id)
{
	unsigned int parm;

	parm = snd_hdac_read_parm(codec, nid, AC_PAR_NODE_COUNT);
	if (parm == -1) {
		*start_id = 0;
		return 0;
	}
	*start_id = (parm >> 16) & 0x7fff;
	return (int)(parm & 0x7fff);
}
EXPORT_SYMBOL_GPL(snd_hdac_get_sub_nodes);

/*
 * look for an AFG and MFG nodes
 */
static void setup_fg_nodes(struct hdac_device *codec)
{
	int i, total_nodes, function_id;
	hda_nid_t nid;

	total_nodes = snd_hdac_get_sub_nodes(codec, AC_NODE_ROOT, &nid);
	for (i = 0; i < total_nodes; i++, nid++) {
		function_id = snd_hdac_read_parm(codec, nid,
						 AC_PAR_FUNCTION_TYPE);
		switch (function_id & 0xff) {
		case AC_GRP_AUDIO_FUNCTION:
			codec->afg = nid;
			codec->afg_function_id = function_id & 0xff;
			codec->afg_unsol = (function_id >> 8) & 1;
			break;
		case AC_GRP_MODEM_FUNCTION:
			codec->mfg = nid;
			codec->mfg_function_id = function_id & 0xff;
			codec->mfg_unsol = (function_id >> 8) & 1;
			break;
		default:
			break;
		}
	}
}

/**
 * snd_hdac_refresh_widgets - Reset the widget start/end nodes
 * @codec: the codec object
 */
int snd_hdac_refresh_widgets(struct hdac_device *codec)
{
	hda_nid_t start_nid;
	int nums;

	nums = snd_hdac_get_sub_nodes(codec, codec->afg, &start_nid);
	if (!start_nid || nums <= 0 || nums >= 0xff) {
		dev_err(&codec->dev, "cannot read sub nodes for FG 0x%02x\n",
			codec->afg);
		return -EINVAL;
	}

	codec->num_nodes = nums;
	codec->start_nid = start_nid;
	codec->end_nid = start_nid + nums;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_refresh_widgets);

/* return CONNLIST_LEN parameter of the given widget */
static unsigned int get_num_conns(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int wcaps = get_wcaps(codec, nid);
	unsigned int parm;

	if (!(wcaps & AC_WCAP_CONN_LIST) &&
	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB)
		return 0;

	parm = snd_hdac_read_parm(codec, nid, AC_PAR_CONNLIST_LEN);
	if (parm == -1)
		parm = 0;
	return parm;
}

/**
 * snd_hdac_get_connections - get a widget connection list
 * @codec: the codec object
 * @nid: NID
 * @conn_list: the array to store the results, can be NULL
 * @max_conns: the max size of the given array
 *
 * Returns the number of connected widgets, zero for no connection, or a
 * negative error code.  When the number of elements don't fit with the
 * given array size, it returns -ENOSPC.
 *
 * When @conn_list is NULL, it just checks the number of connections.
 */
int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
			     hda_nid_t *conn_list, int max_conns)
{
	unsigned int parm;
	int i, conn_len, conns, err;
	unsigned int shift, num_elems, mask;
	hda_nid_t prev_nid;
	int null_count = 0;

	parm = get_num_conns(codec, nid);
	if (!parm)
		return 0;

	if (parm & AC_CLIST_LONG) {
		/* long form */
		shift = 16;
		num_elems = 2;
	} else {
		/* short form */
		shift = 8;
		num_elems = 4;
	}
	conn_len = parm & AC_CLIST_LENGTH;
	mask = (1 << (shift-1)) - 1;

	if (!conn_len)
		return 0; /* no connection */

	if (conn_len == 1) {
		/* single connection */
		err = snd_hdac_read(codec, nid, AC_VERB_GET_CONNECT_LIST, 0,
				    &parm);
		if (err < 0)
			return err;
		if (conn_list)
			conn_list[0] = parm & mask;
		return 1;
	}

	/* multi connection */
	conns = 0;
	prev_nid = 0;
	for (i = 0; i < conn_len; i++) {
		int range_val;
		hda_nid_t val, n;

		if (i % num_elems == 0) {
			err = snd_hdac_read(codec, nid,
					    AC_VERB_GET_CONNECT_LIST, i,
					    &parm);
			if (err < 0)
				return -EIO;
		}
		range_val = !!(parm & (1 << (shift-1))); /* ranges */
		val = parm & mask;
		if (val == 0 && null_count++) {  /* no second chance */
			dev_dbg(&codec->dev,
				"invalid CONNECT_LIST verb %x[%i]:%x\n",
				nid, i, parm);
			return 0;
		}
		parm >>= shift;
		if (range_val) {
			/* ranges between the previous and this one */
			if (!prev_nid || prev_nid >= val) {
				dev_warn(&codec->dev,
					 "invalid dep_range_val %x:%x\n",
					 prev_nid, val);
				continue;
			}
			for (n = prev_nid + 1; n <= val; n++) {
				if (conn_list) {
					if (conns >= max_conns)
						return -ENOSPC;
					conn_list[conns] = n;
				}
				conns++;
			}
		} else {
			if (conn_list) {
				if (conns >= max_conns)
					return -ENOSPC;
				conn_list[conns] = val;
			}
			conns++;
		}
		prev_nid = val;
	}
	return conns;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_connections);

#ifdef CONFIG_PM
/**
 * snd_hdac_power_up - increment the runtime pm counter
 * @codec: the codec object
 */
void snd_hdac_power_up(struct hdac_device *codec)
{
	struct device *dev = &codec->dev;

	if (atomic_read(&codec->in_pm))
		return;
	pm_runtime_get_sync(dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_up);

/**
 * snd_hdac_power_up - decrement the runtime pm counter
 * @codec: the codec object
 */
void snd_hdac_power_down(struct hdac_device *codec)
{
	struct device *dev = &codec->dev;

	if (atomic_read(&codec->in_pm))
		return;
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_down);
#endif

/* codec vendor labels */
struct hda_vendor_id {
	unsigned int id;
	const char *name;
};

static struct hda_vendor_id hda_vendor_ids[] = {
	{ 0x1002, "ATI" },
	{ 0x1013, "Cirrus Logic" },
	{ 0x1057, "Motorola" },
	{ 0x1095, "Silicon Image" },
	{ 0x10de, "Nvidia" },
	{ 0x10ec, "Realtek" },
	{ 0x1102, "Creative" },
	{ 0x1106, "VIA" },
	{ 0x111d, "IDT" },
	{ 0x11c1, "LSI" },
	{ 0x11d4, "Analog Devices" },
	{ 0x13f6, "C-Media" },
	{ 0x14f1, "Conexant" },
	{ 0x17e8, "Chrontel" },
	{ 0x1854, "LG" },
	{ 0x1aec, "Wolfson Microelectronics" },
	{ 0x1af4, "QEMU" },
	{ 0x434d, "C-Media" },
	{ 0x8086, "Intel" },
	{ 0x8384, "SigmaTel" },
	{} /* terminator */
};

/* store the codec vendor name */
static int get_codec_vendor_name(struct hdac_device *codec)
{
	const struct hda_vendor_id *c;
	u16 vendor_id = codec->vendor_id >> 16;

	for (c = hda_vendor_ids; c->id; c++) {
		if (c->id == vendor_id) {
			codec->vendor_name = kstrdup(c->name, GFP_KERNEL);
			return codec->vendor_name ? 0 : -ENOMEM;
		}
	}

	codec->vendor_name = kasprintf(GFP_KERNEL, "Generic %04x", vendor_id);
	return codec->vendor_name ? 0 : -ENOMEM;
}
Commit	Line	Data
7639a06c TI	1	/*
	2	* HD-audio codec core device
	3	*/
	4
	5	#include <linux/init.h>
	6	#include <linux/device.h>
	7	#include <linux/slab.h>
	8	#include <linux/module.h>
	9	#include <linux/export.h>
	10	#include <linux/pm_runtime.h>
	11	#include <sound/hdaudio.h>
	12	#include "local.h"
	13
	14	static void setup_fg_nodes(struct hdac_device *codec);
	15	static int get_codec_vendor_name(struct hdac_device *codec);
	16
	17	static void default_release(struct device *dev)
	18	{
	19	snd_hdac_device_exit(container_of(dev, struct hdac_device, dev));
	20	}
	21
	22	/**
	23	* snd_hdac_device_init - initialize the HD-audio codec base device
	24	* @codec: device to initialize
	25	* @bus: but to attach
	26	* @name: device name string
	27	* @addr: codec address
	28	*
	29	* Returns zero for success or a negative error code.
	30	*
	31	* This function increments the runtime PM counter and marks it active.
	32	* The caller needs to turn it off appropriately later.
	33	*
	34	* The caller needs to set the device's release op properly by itself.
	35	*/
	36	int snd_hdac_device_init(struct hdac_device codec, struct hdac_bus bus,
	37	const char *name, unsigned int addr)
	38	{
	39	struct device *dev;
	40	hda_nid_t fg;
	41	int err;
	42
	43	dev = &codec->dev;
	44	device_initialize(dev);
	45	dev->parent = bus->dev;
	46	dev->bus = &snd_hda_bus_type;
	47	dev->release = default_release;
	48	dev_set_name(dev, "%s", name);
	49	device_enable_async_suspend(dev);
	50
	51	codec->bus = bus;
	52	codec->addr = addr;
	53	codec->type = HDA_DEV_CORE;
	54	pm_runtime_set_active(&codec->dev);
	55	pm_runtime_get_noresume(&codec->dev);
	56	atomic_set(&codec->in_pm, 0);
	57
	58	err = snd_hdac_bus_add_device(bus, codec);
	59	if (err < 0)
	60	goto error;
	61
	62	/* fill parameters */
	63	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
	64	AC_PAR_VENDOR_ID);
65	if (codec->vendor_id == -1) {
66	/* read again, hopefully the access method was corrected
67	* in the last read...
68	*/
69	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
70	AC_PAR_VENDOR_ID);
71	}
72
73	codec->subsystem_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
74	AC_PAR_SUBSYSTEM_ID);
75	codec->revision_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
76	AC_PAR_REV_ID);
77
78	setup_fg_nodes(codec);
79	if (!codec->afg && !codec->mfg) {
80	dev_err(dev, "no AFG or MFG node found\n");
81	err = -ENODEV;
82	goto error;
83	}
84
85	fg = codec->afg ? codec->afg : codec->mfg;
86
87	err = snd_hdac_refresh_widgets(codec);
88	if (err < 0)
89	goto error;
90
91	codec->power_caps = snd_hdac_read_parm(codec, fg, AC_PAR_POWER_STATE);
92	/* reread ssid if not set by parameter */
93	if (codec->subsystem_id == -1)
94	snd_hdac_read(codec, fg, AC_VERB_GET_SUBSYSTEM_ID, 0,
95	&codec->subsystem_id);
96
97	err = get_codec_vendor_name(codec);
98	if (err < 0)
99	goto error;
100
101	codec->chip_name = kasprintf(GFP_KERNEL, "ID %x",
102	codec->vendor_id & 0xffff);
103	if (!codec->chip_name) {
104	err = -ENOMEM;
105	goto error;
106	}
107
108	return 0;
109
110	error:
111	pm_runtime_put_noidle(&codec->dev);
112	put_device(&codec->dev);
113	return err;
114	}
115	EXPORT_SYMBOL_GPL(snd_hdac_device_init);
116
117	/**
118	* snd_hdac_device_exit - clean up the HD-audio codec base device
119	* @codec: device to clean up
120	*/
121	void snd_hdac_device_exit(struct hdac_device *codec)
122	{
123	/* pm_runtime_put_noidle(&codec->dev); */
124	snd_hdac_bus_remove_device(codec->bus, codec);
125	kfree(codec->vendor_name);
126	kfree(codec->chip_name);
127	}
128	EXPORT_SYMBOL_GPL(snd_hdac_device_exit);
129
130	/**
131	* snd_hdac_make_cmd - compose a 32bit command word to be sent to the
132	* HD-audio controller
133	* @codec: the codec object
134	* @nid: NID to encode
135	* @verb: verb to encode
136	* @parm: parameter to encode
137	*
138	* Return an encoded command verb or -1 for error.
139	*/
140	unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
141	unsigned int verb, unsigned int parm)
142	{
143	u32 val, addr;
144
145	addr = codec->addr;
146	if ((addr & ~0xf) \|\| (nid & ~0x7f) \|\|
147	(verb & ~0xfff) \|\| (parm & ~0xffff)) {
148	dev_err(&codec->dev, "out of range cmd %x:%x:%x:%x\n",
149	addr, nid, verb, parm);
150	return -1;
151	}
152
153	val = addr << 28;
154	val \|= (u32)nid << 20;
155	val \|= verb << 8;
156	val \|= parm;
157	return val;
158	}
159	EXPORT_SYMBOL_GPL(snd_hdac_make_cmd);
160
161	/**
162	* snd_hdac_read - execute a verb
163	* @codec: the codec object
164	* @nid: NID to execute a verb
165	* @verb: verb to execute
166	* @parm: parameter for a verb
167	* @res: the pointer to store the result, NULL if running async
168	*
169	* Returns zero if successful, or a negative error code.
170	*/
171	int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
172	unsigned int verb, unsigned int parm, unsigned int *res)
173	{
174	unsigned int cmd = snd_hdac_make_cmd(codec, nid, verb, parm);
175
176	return snd_hdac_bus_exec_verb(codec->bus, codec->addr, cmd, res);
177	}
178	EXPORT_SYMBOL_GPL(snd_hdac_read);
179
180	/**
181	* snd_hdac_read_parm - read a codec parameter
182	* @codec: the codec object
183	* @nid: NID to read a parameter
184	* @parm: parameter to read
185	*
186	* Returns -1 for error. If you need to distinguish the error more
187	* strictly, use snd_hdac_read() directly.
188	*/
189	int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm)
190	{
191	int val;
192
193	if (snd_hdac_read(codec, nid, AC_VERB_PARAMETERS, parm, &val))
194	return -1;
195	return val;
196	}
197	EXPORT_SYMBOL_GPL(snd_hdac_read_parm);
198
199	/**
200	* snd_hdac_get_sub_nodes - get start NID and number of subtree nodes
201	* @codec: the codec object
202	* @nid: NID to inspect
203	* @start_id: the pointer to store the starting NID
204	*
205	* Returns the number of subtree nodes or zero if not found.
206	*/
207	int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
208	hda_nid_t *start_id)
209	{
210	unsigned int parm;
211
212	parm = snd_hdac_read_parm(codec, nid, AC_PAR_NODE_COUNT);
213	if (parm == -1) {
214	*start_id = 0;
215	return 0;
216	}
217	*start_id = (parm >> 16) & 0x7fff;
218	return (int)(parm & 0x7fff);
219	}
220	EXPORT_SYMBOL_GPL(snd_hdac_get_sub_nodes);
221
222	/*
223	* look for an AFG and MFG nodes
224	*/
225	static void setup_fg_nodes(struct hdac_device *codec)
226	{
227	int i, total_nodes, function_id;
228	hda_nid_t nid;
229
230	total_nodes = snd_hdac_get_sub_nodes(codec, AC_NODE_ROOT, &nid);
231	for (i = 0; i < total_nodes; i++, nid++) {
232	function_id = snd_hdac_read_parm(codec, nid,
233	AC_PAR_FUNCTION_TYPE);
234	switch (function_id & 0xff) {
235	case AC_GRP_AUDIO_FUNCTION:
236	codec->afg = nid;
237	codec->afg_function_id = function_id & 0xff;
238	codec->afg_unsol = (function_id >> 8) & 1;
239	break;
240	case AC_GRP_MODEM_FUNCTION:
241	codec->mfg = nid;
242	codec->mfg_function_id = function_id & 0xff;
243	codec->mfg_unsol = (function_id >> 8) & 1;
244	break;
245	default:
246	break;
247	}
248	}
249	}
250
251	/**
252	* snd_hdac_refresh_widgets - Reset the widget start/end nodes
253	* @codec: the codec object
254	*/
255	int snd_hdac_refresh_widgets(struct hdac_device *codec)
256	{
257	hda_nid_t start_nid;
258	int nums;
259
260	nums = snd_hdac_get_sub_nodes(codec, codec->afg, &start_nid);
261	if (!start_nid \|\| nums <= 0 \|\| nums >= 0xff) {
262	dev_err(&codec->dev, "cannot read sub nodes for FG 0x%02x\n",
263	codec->afg);
264	return -EINVAL;
265	}
266
267	codec->num_nodes = nums;
268	codec->start_nid = start_nid;
269	codec->end_nid = start_nid + nums;
270	return 0;
271	}
272	EXPORT_SYMBOL_GPL(snd_hdac_refresh_widgets);
273
274	/* return CONNLIST_LEN parameter of the given widget */
275	static unsigned int get_num_conns(struct hdac_device *codec, hda_nid_t nid)
276	{
277	unsigned int wcaps = get_wcaps(codec, nid);
278	unsigned int parm;
279
280	if (!(wcaps & AC_WCAP_CONN_LIST) &&
281	get_wcaps_type(wcaps) != AC_WID_VOL_KNB)
282	return 0;
283
284	parm = snd_hdac_read_parm(codec, nid, AC_PAR_CONNLIST_LEN);
285	if (parm == -1)
286	parm = 0;
287	return parm;
288	}
289
290	/**
291	* snd_hdac_get_connections - get a widget connection list
292	* @codec: the codec object
293	* @nid: NID
294	* @conn_list: the array to store the results, can be NULL
295	* @max_conns: the max size of the given array
296	*
297	* Returns the number of connected widgets, zero for no connection, or a
298	* negative error code. When the number of elements don't fit with the
299	* given array size, it returns -ENOSPC.
300	*
301	* When @conn_list is NULL, it just checks the number of connections.
302	*/
303	int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
304	hda_nid_t *conn_list, int max_conns)
305	{
306	unsigned int parm;
307	int i, conn_len, conns, err;
308	unsigned int shift, num_elems, mask;
309	hda_nid_t prev_nid;
310	int null_count = 0;
311
312	parm = get_num_conns(codec, nid);
313	if (!parm)
314	return 0;
315
316	if (parm & AC_CLIST_LONG) {
317	/* long form */
318	shift = 16;
319	num_elems = 2;
320	} else {
321	/* short form */
322	shift = 8;
323	num_elems = 4;
324	}
325	conn_len = parm & AC_CLIST_LENGTH;
326	mask = (1 << (shift-1)) - 1;
327
328	if (!conn_len)
329	return 0; /* no connection */
330
331	if (conn_len == 1) {
332	/* single connection */
333	err = snd_hdac_read(codec, nid, AC_VERB_GET_CONNECT_LIST, 0,
334	&parm);
335	if (err < 0)
336	return err;
337	if (conn_list)
338	conn_list[0] = parm & mask;
339	return 1;
340	}
341
342	/* multi connection */
343	conns = 0;
344	prev_nid = 0;
345	for (i = 0; i < conn_len; i++) {
346	int range_val;
347	hda_nid_t val, n;
348
349	if (i % num_elems == 0) {
350	err = snd_hdac_read(codec, nid,
351	AC_VERB_GET_CONNECT_LIST, i,
352	&parm);
353	if (err < 0)
354	return -EIO;
355	}
356	range_val = !!(parm & (1 << (shift-1))); /* ranges */
357	val = parm & mask;
358	if (val == 0 && null_count++) { /* no second chance */
359	dev_dbg(&codec->dev,
360	"invalid CONNECT_LIST verb %x[%i]:%x\n",
361	nid, i, parm);
362	return 0;
363	}
364	parm >>= shift;
365	if (range_val) {
366	/* ranges between the previous and this one */
367	if (!prev_nid \|\| prev_nid >= val) {
368	dev_warn(&codec->dev,
369	"invalid dep_range_val %x:%x\n",
370	prev_nid, val);
371	continue;
372	}
373	for (n = prev_nid + 1; n <= val; n++) {
374	if (conn_list) {
375	if (conns >= max_conns)
376	return -ENOSPC;
377	conn_list[conns] = n;
378	}
379	conns++;
380	}
381	} else {
382	if (conn_list) {
383	if (conns >= max_conns)
384	return -ENOSPC;
385	conn_list[conns] = val;
386	}
387	conns++;
388	}
389	prev_nid = val;
390	}
391	return conns;
392	}
393	EXPORT_SYMBOL_GPL(snd_hdac_get_connections);
394
395	#ifdef CONFIG_PM
396	/**
397	* snd_hdac_power_up - increment the runtime pm counter
398	* @codec: the codec object
399	*/
400	void snd_hdac_power_up(struct hdac_device *codec)
401	{
402	struct device *dev = &codec->dev;
403
404	if (atomic_read(&codec->in_pm))
405	return;
406	pm_runtime_get_sync(dev);
407	}
408	EXPORT_SYMBOL_GPL(snd_hdac_power_up);
409
410	/**
411	* snd_hdac_power_up - decrement the runtime pm counter
412	* @codec: the codec object
413	*/
414	void snd_hdac_power_down(struct hdac_device *codec)
415	{
416	struct device *dev = &codec->dev;
417
418	if (atomic_read(&codec->in_pm))
419	return;
420	pm_runtime_mark_last_busy(dev);
421	pm_runtime_put_autosuspend(dev);
422	}
423	EXPORT_SYMBOL_GPL(snd_hdac_power_down);
424	#endif
425
426	/* codec vendor labels */
427	struct hda_vendor_id {
428	unsigned int id;
429	const char *name;
430	};
431
432	static struct hda_vendor_id hda_vendor_ids[] = {
433	{ 0x1002, "ATI" },
434	{ 0x1013, "Cirrus Logic" },
435	{ 0x1057, "Motorola" },
436	{ 0x1095, "Silicon Image" },
437	{ 0x10de, "Nvidia" },
438	{ 0x10ec, "Realtek" },
439	{ 0x1102, "Creative" },
440	{ 0x1106, "VIA" },
441	{ 0x111d, "IDT" },
442	{ 0x11c1, "LSI" },
443	{ 0x11d4, "Analog Devices" },
444	{ 0x13f6, "C-Media" },
445	{ 0x14f1, "Conexant" },
446	{ 0x17e8, "Chrontel" },
447	{ 0x1854, "LG" },
448	{ 0x1aec, "Wolfson Microelectronics" },
449	{ 0x1af4, "QEMU" },
450	{ 0x434d, "C-Media" },
451	{ 0x8086, "Intel" },
452	{ 0x8384, "SigmaTel" },
453	{} /* terminator */
454	};
455
456	/* store the codec vendor name */
457	static int get_codec_vendor_name(struct hdac_device *codec)
458	{
459	const struct hda_vendor_id *c;
460	u16 vendor_id = codec->vendor_id >> 16;
461
462	for (c = hda_vendor_ids; c->id; c++) {
463	if (c->id == vendor_id) {
464	codec->vendor_name = kstrdup(c->name, GFP_KERNEL);
465	return codec->vendor_name ? 0 : -ENOMEM;
466	}
467	}
468
469	codec->vendor_name = kasprintf(GFP_KERNEL, "Generic %04x", vendor_id);
470	return codec->vendor_name ? 0 : -ENOMEM;
471	}