[deliverable/linux.git] / drivers / gpu / drm / nouveau / core / subdev / i2c / base.c

/*
 * Copyright 2013 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#include <core/option.h>

#include <subdev/bios.h>
#include <subdev/bios/dcb.h>
#include <subdev/bios/i2c.h>
#include <subdev/i2c.h>
#include <subdev/vga.h>

/******************************************************************************
 * interface to linux i2c bit-banging algorithm
 *****************************************************************************/

#ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
#define CSTMSEL true
#else
#define CSTMSEL false
#endif

static int
nouveau_i2c_pre_xfer(struct i2c_adapter *adap)
{
	struct i2c_algo_bit_data *bit = adap->algo_data;
	struct nouveau_i2c_port *port = bit->data;
	if (port->func->acquire)
		port->func->acquire(port);
	return 0;
}

static void
nouveau_i2c_setscl(void *data, int state)
{
	struct nouveau_i2c_port *port = data;
	port->func->drive_scl(port, state);
}

static void
nouveau_i2c_setsda(void *data, int state)
{
	struct nouveau_i2c_port *port = data;
	port->func->drive_sda(port, state);
}

static int
nouveau_i2c_getscl(void *data)
{
	struct nouveau_i2c_port *port = data;
	return port->func->sense_scl(port);
}

static int
nouveau_i2c_getsda(void *data)
{
	struct nouveau_i2c_port *port = data;
	return port->func->sense_sda(port);
}

/******************************************************************************
 * base i2c "port" class implementation
 *****************************************************************************/

void
_nouveau_i2c_port_dtor(struct nouveau_object *object)
{
	struct nouveau_i2c_port *port = (void *)object;
	i2c_del_adapter(&port->adapter);
	nouveau_object_destroy(&port->base);
}

int
nouveau_i2c_port_create_(struct nouveau_object *parent,
			 struct nouveau_object *engine,
			 struct nouveau_oclass *oclass, u8 index,
			 const struct i2c_algorithm *algo,
			 const struct nouveau_i2c_func *func,
			 int size, void **pobject)
{
	struct nouveau_device *device = nv_device(parent);
	struct nouveau_i2c *i2c = (void *)engine;
	struct nouveau_i2c_port *port;
	int ret;

	ret = nouveau_object_create_(parent, engine, oclass, 0, size, pobject);
	port = *pobject;
	if (ret)
		return ret;

	snprintf(port->adapter.name, sizeof(port->adapter.name),
		 "nouveau-%s-%d", device->name, index);
	port->adapter.owner = THIS_MODULE;
	port->adapter.dev.parent = nv_device_base(device);
	port->index = index;
	port->func = func;
	i2c_set_adapdata(&port->adapter, i2c);

	if ( algo == &nouveau_i2c_bit_algo &&
	    !nouveau_boolopt(device->cfgopt, "NvI2C", CSTMSEL)) {
		struct i2c_algo_bit_data *bit;

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

		bit->udelay = 10;
		bit->timeout = usecs_to_jiffies(2200);
		bit->data = port;
		bit->pre_xfer = nouveau_i2c_pre_xfer;
		bit->setsda = nouveau_i2c_setsda;
		bit->setscl = nouveau_i2c_setscl;
		bit->getsda = nouveau_i2c_getsda;
		bit->getscl = nouveau_i2c_getscl;

		port->adapter.algo_data = bit;
		ret = i2c_bit_add_bus(&port->adapter);
	} else {
		port->adapter.algo_data = port;
		port->adapter.algo = algo;
		ret = i2c_add_adapter(&port->adapter);
	}

	/* drop port's i2c subdev refcount, i2c handles this itself */
	if (ret == 0)
		list_add_tail(&port->head, &i2c->ports);
	return ret;
}

/******************************************************************************
 * base i2c subdev class implementation
 *****************************************************************************/

static struct nouveau_i2c_port *
nouveau_i2c_find(struct nouveau_i2c *i2c, u8 index)
{
	struct nouveau_bios *bios = nouveau_bios(i2c);
	struct nouveau_i2c_port *port;

	if (index == NV_I2C_DEFAULT(0) ||
	    index == NV_I2C_DEFAULT(1)) {
		u8  ver, hdr, cnt, len;
		u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
		if (i2c && ver >= 0x30) {
			u8 auxidx = nv_ro08(bios, i2c + 4);
			if (index == NV_I2C_DEFAULT(0))
				index = (auxidx & 0x0f) >> 0;
			else
				index = (auxidx & 0xf0) >> 4;
		} else {
			index = 2;
		}
	}

	list_for_each_entry(port, &i2c->ports, head) {
		if (port->index == index)
			return port;
	}

	return NULL;
}

static struct nouveau_i2c_port *
nouveau_i2c_find_type(struct nouveau_i2c *i2c, u16 type)
{
	struct nouveau_i2c_port *port;

	list_for_each_entry(port, &i2c->ports, head) {
		if (nv_hclass(port) == type)
			return port;
	}

	return NULL;
}

static int
nouveau_i2c_identify(struct nouveau_i2c *i2c, int index, const char *what,
		     struct nouveau_i2c_board_info *info,
		     bool (*match)(struct nouveau_i2c_port *,
				   struct i2c_board_info *, void *), void *data)
{
	struct nouveau_i2c_port *port = nouveau_i2c_find(i2c, index);
	int i;

	if (!port) {
		nv_debug(i2c, "no bus when probing %s on %d\n", what, index);
		return -ENODEV;
	}

	nv_debug(i2c, "probing %ss on bus: %d\n", what, port->index);
	for (i = 0; info[i].dev.addr; i++) {
		u8 orig_udelay = 0;

		if ((port->adapter.algo == &i2c_bit_algo) &&
		    (info[i].udelay != 0)) {
			struct i2c_algo_bit_data *algo = port->adapter.algo_data;
			nv_debug(i2c, "using custom udelay %d instead of %d\n",
			         info[i].udelay, algo->udelay);
			orig_udelay = algo->udelay;
			algo->udelay = info[i].udelay;
		}

		if (nv_probe_i2c(port, info[i].dev.addr) &&
		    (!match || match(port, &info[i].dev, data))) {
			nv_info(i2c, "detected %s: %s\n", what,
				info[i].dev.type);
			return i;
		}

		if (orig_udelay) {
			struct i2c_algo_bit_data *algo = port->adapter.algo_data;
			algo->udelay = orig_udelay;
		}
	}

	nv_debug(i2c, "no devices found.\n");
	return -ENODEV;
}

int
_nouveau_i2c_fini(struct nouveau_object *object, bool suspend)
{
	struct nouveau_i2c *i2c = (void *)object;
	struct nouveau_i2c_port *port;
	int ret;

	list_for_each_entry(port, &i2c->ports, head) {
		ret = nv_ofuncs(port)->fini(nv_object(port), suspend);
		if (ret && suspend)
			goto fail;
	}

	return nouveau_subdev_fini(&i2c->base, suspend);
fail:
	list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
		nv_ofuncs(port)->init(nv_object(port));
	}

	return ret;
}

int
_nouveau_i2c_init(struct nouveau_object *object)
{
	struct nouveau_i2c *i2c = (void *)object;
	struct nouveau_i2c_port *port;
	int ret;

	ret = nouveau_subdev_init(&i2c->base);
	if (ret == 0) {
		list_for_each_entry(port, &i2c->ports, head) {
			ret = nv_ofuncs(port)->init(nv_object(port));
			if (ret)
				goto fail;
		}
	}

	return ret;
fail:
	list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
		nv_ofuncs(port)->fini(nv_object(port), false);
	}

	return ret;
}

void
_nouveau_i2c_dtor(struct nouveau_object *object)
{
	struct nouveau_i2c *i2c = (void *)object;
	struct nouveau_i2c_port *port, *temp;

	list_for_each_entry_safe(port, temp, &i2c->ports, head) {
		nouveau_object_ref(NULL, (struct nouveau_object **)&port);
	}

	nouveau_subdev_destroy(&i2c->base);
}

static struct nouveau_oclass *
nouveau_i2c_extdev_sclass[] = {
	nouveau_anx9805_sclass,
};

int
nouveau_i2c_create_(struct nouveau_object *parent,
		    struct nouveau_object *engine,
		    struct nouveau_oclass *oclass,
		    struct nouveau_oclass *sclass,
		    int length, void **pobject)
{
	struct nouveau_bios *bios = nouveau_bios(parent);
	struct nouveau_i2c *i2c;
	struct nouveau_object *object;
	struct dcb_i2c_entry info;
	int ret, i, j, index = -1;
	struct dcb_output outp;
	u8  ver, hdr;
	u32 data;

	ret = nouveau_subdev_create(parent, engine, oclass, 0,
				    "I2C", "i2c", &i2c);
	*pobject = nv_object(i2c);
	if (ret)
		return ret;

	i2c->find = nouveau_i2c_find;
	i2c->find_type = nouveau_i2c_find_type;
	i2c->identify = nouveau_i2c_identify;
	INIT_LIST_HEAD(&i2c->ports);

	while (!dcb_i2c_parse(bios, ++index, &info)) {
		if (info.type == DCB_I2C_UNUSED)
			continue;

		oclass = sclass;
		do {
			ret = -EINVAL;
			if (oclass->handle == info.type) {
				ret = nouveau_object_ctor(*pobject, *pobject,
							  oclass, &info,
							  index, &object);
			}
		} while (ret && (++oclass)->handle);
	}

	/* in addition to the busses specified in the i2c table, there
	 * may be ddc/aux channels hiding behind external tmds/dp/etc
	 * transmitters.
	 */
	index = ((index + 0x0f) / 0x10) * 0x10;
	i = -1;
	while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) {
		if (!outp.location || !outp.extdev)
			continue;

		switch (outp.type) {
		case DCB_OUTPUT_TMDS:
			info.type = NV_I2C_TYPE_EXTDDC(outp.extdev);
			break;
		case DCB_OUTPUT_DP:
			info.type = NV_I2C_TYPE_EXTAUX(outp.extdev);
			break;
		default:
			continue;
		}

		ret = -ENODEV;
		j = -1;
		while (ret && ++j < ARRAY_SIZE(nouveau_i2c_extdev_sclass)) {
			parent = nv_object(i2c->find(i2c, outp.i2c_index));
			oclass = nouveau_i2c_extdev_sclass[j];
			do {
				if (oclass->handle != info.type)
					continue;
				ret = nouveau_object_ctor(parent, *pobject,
							  oclass, NULL,
							  index++, &object);
			} while (ret && (++oclass)->handle);
		}
	}

	return 0;
}
Commit	Line	Data
6ee73861	1	/*
7dcd060c	2	* Copyright 2013 Red Hat Inc.
6ee73861 BS	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*
	22	* Authors: Ben Skeggs
	23	*/
	24
7dcd060c	25	#include <core/option.h>
e0cd3608	26
5effecd4 BS	27	#include <subdev/bios.h>
	28	#include <subdev/bios/dcb.h>
	29	#include <subdev/bios/i2c.h>
7dcd060c BS	30	#include <subdev/i2c.h>
7dcd060c BS	31	#include <subdev/vga.h>
6ee73861	32
7dcd060c BS	33	/******************************************************************************
	34	* interface to linux i2c bit-banging algorithm
	35	*****************************************************************************/
	36
	37	#ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
	38	#define CSTMSEL true
	39	#else
	40	#define CSTMSEL false
	41	#endif
	42
	43	static int
	44	nouveau_i2c_pre_xfer(struct i2c_adapter *adap)
4196faa8	45	{
7dcd060c BS	46	struct i2c_algo_bit_data *bit = adap->algo_data;
	47	struct nouveau_i2c_port *port = bit->data;
	48	if (port->func->acquire)
	49	port->func->acquire(port);
	50	return 0;
	51	}
4196faa8	52
7dcd060c BS	53	static void
	54	nouveau_i2c_setscl(void *data, int state)
	55	{
	56	struct nouveau_i2c_port *port = data;
	57	port->func->drive_scl(port, state);
	58	}
4196faa8	59
7dcd060c BS	60	static void
	61	nouveau_i2c_setsda(void *data, int state)
	62	{
	63	struct nouveau_i2c_port *port = data;
	64	port->func->drive_sda(port, state);
4196faa8 BS	65	}
4196faa8 BS	66
7dcd060c BS	67	static int
7dcd060c BS	68	nouveau_i2c_getscl(void *data)
4196faa8	69	{
7dcd060c BS	70	struct nouveau_i2c_port *port = data;
	71	return port->func->sense_scl(port);
	72	}
4196faa8	73
7dcd060c BS	74	static int
	75	nouveau_i2c_getsda(void *data)
	76	{
	77	struct nouveau_i2c_port *port = data;
	78	return port->func->sense_sda(port);
	79	}
4196faa8	80
7dcd060c BS	81	/******************************************************************************
	82	* base i2c "port" class implementation
	83	*****************************************************************************/
	84
	85	void
	86	_nouveau_i2c_port_dtor(struct nouveau_object *object)
	87	{
	88	struct nouveau_i2c_port port = (void )object;
	89	i2c_del_adapter(&port->adapter);
	90	nouveau_object_destroy(&port->base);
4196faa8 BS	91	}
4196faa8 BS	92
7dcd060c BS	93	int
	94	nouveau_i2c_port_create_(struct nouveau_object *parent,
	95	struct nouveau_object *engine,
	96	struct nouveau_oclass *oclass, u8 index,
	97	const struct i2c_algorithm *algo,
c865534f	98	const struct nouveau_i2c_func *func,
7dcd060c	99	int size, void **pobject)
4196faa8	100	{
7dcd060c BS	101	struct nouveau_device *device = nv_device(parent);
	102	struct nouveau_i2c i2c = (void )engine;
	103	struct nouveau_i2c_port *port;
	104	int ret;
	105
	106	ret = nouveau_object_create_(parent, engine, oclass, 0, size, pobject);
	107	port = *pobject;
	108	if (ret)
	109	return ret;
	110
	111	snprintf(port->adapter.name, sizeof(port->adapter.name),
	112	"nouveau-%s-%d", device->name, index);
	113	port->adapter.owner = THIS_MODULE;
420b9469	114	port->adapter.dev.parent = nv_device_base(device);
7dcd060c	115	port->index = index;
c865534f	116	port->func = func;
7dcd060c BS	117	i2c_set_adapdata(&port->adapter, i2c);
	118
	119	if ( algo == &nouveau_i2c_bit_algo &&
	120	!nouveau_boolopt(device->cfgopt, "NvI2C", CSTMSEL)) {
	121	struct i2c_algo_bit_data *bit;
	122
	123	bit = kzalloc(sizeof(*bit), GFP_KERNEL);
	124	if (!bit)
	125	return -ENOMEM;
	126
	127	bit->udelay = 10;
	128	bit->timeout = usecs_to_jiffies(2200);
	129	bit->data = port;
	130	bit->pre_xfer = nouveau_i2c_pre_xfer;
	131	bit->setsda = nouveau_i2c_setsda;
	132	bit->setscl = nouveau_i2c_setscl;
	133	bit->getsda = nouveau_i2c_getsda;
	134	bit->getscl = nouveau_i2c_getscl;
	135
	136	port->adapter.algo_data = bit;
	137	ret = i2c_bit_add_bus(&port->adapter);
	138	} else {
	139	port->adapter.algo_data = port;
	140	port->adapter.algo = algo;
	141	ret = i2c_add_adapter(&port->adapter);
	142	}
	143
	144	/* drop port's i2c subdev refcount, i2c handles this itself */
d395f1e4	145	if (ret == 0)
7dcd060c	146	list_add_tail(&port->head, &i2c->ports);
7dcd060c	147	return ret;
4196faa8 BS	148	}
4196faa8 BS	149
7dcd060c BS	150	/******************************************************************************
	151	* base i2c subdev class implementation
	152	*****************************************************************************/
	153
4196faa8 BS	154	static struct nouveau_i2c_port *
	155	nouveau_i2c_find(struct nouveau_i2c *i2c, u8 index)
	156	{
	157	struct nouveau_bios *bios = nouveau_bios(i2c);
	158	struct nouveau_i2c_port *port;
	159
	160	if (index == NV_I2C_DEFAULT(0) \|\|
	161	index == NV_I2C_DEFAULT(1)) {
	162	u8 ver, hdr, cnt, len;
	163	u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
	164	if (i2c && ver >= 0x30) {
	165	u8 auxidx = nv_ro08(bios, i2c + 4);
	166	if (index == NV_I2C_DEFAULT(0))
	167	index = (auxidx & 0x0f) >> 0;
	168	else
	169	index = (auxidx & 0xf0) >> 4;
	170	} else {
	171	index = 2;
	172	}
	173	}
	174
	175	list_for_each_entry(port, &i2c->ports, head) {
	176	if (port->index == index)
df3ef6a1	177	return port;
4196faa8 BS	178	}
4196faa8 BS	179
df3ef6a1	180	return NULL;
4196faa8 BS	181	}
4196faa8 BS	182
548ddb6d BS	183	static struct nouveau_i2c_port *
	184	nouveau_i2c_find_type(struct nouveau_i2c *i2c, u16 type)
	185	{
	186	struct nouveau_i2c_port *port;
	187
	188	list_for_each_entry(port, &i2c->ports, head) {
7dcd060c	189	if (nv_hclass(port) == type)
548ddb6d BS	190	return port;
	191	}
	192
	193	return NULL;
	194	}
	195
4196faa8 BS	196	static int
4196faa8 BS	197	nouveau_i2c_identify(struct nouveau_i2c i2c, int index, const char what,
9e2b734f	198	struct nouveau_i2c_board_info *info,
4196faa8	199	bool (match)(struct nouveau_i2c_port ,
fdd239ac	200	struct i2c_board_info , void ), void *data)
6ee73861	201	{
4196faa8 BS	202	struct nouveau_i2c_port *port = nouveau_i2c_find(i2c, index);
	203	int i;
	204
	205	if (!port) {
	206	nv_debug(i2c, "no bus when probing %s on %d\n", what, index);
	207	return -ENODEV;
	208	}
	209
	210	nv_debug(i2c, "probing %ss on bus: %d\n", what, port->index);
9e2b734f MP	211	for (i = 0; info[i].dev.addr; i++) {
	212	u8 orig_udelay = 0;
	213
	214	if ((port->adapter.algo == &i2c_bit_algo) &&
	215	(info[i].udelay != 0)) {
	216	struct i2c_algo_bit_data *algo = port->adapter.algo_data;
	217	nv_debug(i2c, "using custom udelay %d instead of %d\n",
	218	info[i].udelay, algo->udelay);
	219	orig_udelay = algo->udelay;
	220	algo->udelay = info[i].udelay;
	221	}
	222
	223	if (nv_probe_i2c(port, info[i].dev.addr) &&
fdd239ac	224	(!match \|\| match(port, &info[i].dev, data))) {
9e2b734f MP	225	nv_info(i2c, "detected %s: %s\n", what,
9e2b734f MP	226	info[i].dev.type);
4196faa8 BS	227	return i;
4196faa8 BS	228	}
9e2b734f MP	229
	230	if (orig_udelay) {
	231	struct i2c_algo_bit_data *algo = port->adapter.algo_data;
	232	algo->udelay = orig_udelay;
	233	}
4196faa8 BS	234	}
	235
	236	nv_debug(i2c, "no devices found.\n");
	237	return -ENODEV;
	238	}
	239
7dcd060c BS	240	int
7dcd060c BS	241	_nouveau_i2c_fini(struct nouveau_object *object, bool suspend)
4196faa8	242	{
7dcd060c BS	243	struct nouveau_i2c i2c = (void )object;
	244	struct nouveau_i2c_port *port;
	245	int ret;
4196faa8	246
7dcd060c BS	247	list_for_each_entry(port, &i2c->ports, head) {
	248	ret = nv_ofuncs(port)->fini(nv_object(port), suspend);
	249	if (ret && suspend)
	250	goto fail;
2bdb06e3	251	}
4196faa8	252
7dcd060c BS	253	return nouveau_subdev_fini(&i2c->base, suspend);
	254	fail:
	255	list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
	256	nv_ofuncs(port)->init(nv_object(port));
2bdb06e3	257	}
7dcd060c BS	258
7dcd060c BS	259	return ret;
6ee73861 BS	260	}
6ee73861 BS	261
4196faa8	262	int
7dcd060c	263	_nouveau_i2c_init(struct nouveau_object *object)
eeb3ca12	264	{
7dcd060c BS	265	struct nouveau_i2c i2c = (void )object;
	266	struct nouveau_i2c_port *port;
	267	int ret;
	268
	269	ret = nouveau_subdev_init(&i2c->base);
	270	if (ret == 0) {
	271	list_for_each_entry(port, &i2c->ports, head) {
	272	ret = nv_ofuncs(port)->init(nv_object(port));
	273	if (ret)
	274	goto fail;
	275	}
2bdb06e3	276	}
4196faa8	277
7dcd060c BS	278	return ret;
	279	fail:
	280	list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
	281	nv_ofuncs(port)->fini(nv_object(port), false);
2bdb06e3	282	}
4196faa8	283
7dcd060c	284	return ret;
eeb3ca12	285	}
6ee73861	286
7dcd060c BS	287	void
7dcd060c BS	288	_nouveau_i2c_dtor(struct nouveau_object *object)
df3ef6a1	289	{
7dcd060c BS	290	struct nouveau_i2c i2c = (void )object;
	291	struct nouveau_i2c_port port, temp;
	292
	293	list_for_each_entry_safe(port, temp, &i2c->ports, head) {
	294	nouveau_object_ref(NULL, (struct nouveau_object **)&port);
df3ef6a1 BS	295	}
df3ef6a1 BS	296
7dcd060c	297	nouveau_subdev_destroy(&i2c->base);
df3ef6a1 BS	298	}
df3ef6a1 BS	299
5effecd4 BS	300	static struct nouveau_oclass *
	301	nouveau_i2c_extdev_sclass[] = {
	302	nouveau_anx9805_sclass,
	303	};
	304
7dcd060c BS	305	int
	306	nouveau_i2c_create_(struct nouveau_object *parent,
	307	struct nouveau_object *engine,
	308	struct nouveau_oclass *oclass,
	309	struct nouveau_oclass *sclass,
	310	int length, void **pobject)
6ee73861	311	{
4196faa8	312	struct nouveau_bios *bios = nouveau_bios(parent);
4196faa8	313	struct nouveau_i2c *i2c;
7dcd060c	314	struct nouveau_object *object;
4196faa8	315	struct dcb_i2c_entry info;
5effecd4 BS	316	int ret, i, j, index = -1;
	317	struct dcb_output outp;
	318	u8 ver, hdr;
	319	u32 data;
4196faa8 BS	320
	321	ret = nouveau_subdev_create(parent, engine, oclass, 0,
	322	"I2C", "i2c", &i2c);
	323	*pobject = nv_object(i2c);
	324	if (ret)
	325	return ret;
	326
	327	i2c->find = nouveau_i2c_find;
548ddb6d	328	i2c->find_type = nouveau_i2c_find_type;
4196faa8 BS	329	i2c->identify = nouveau_i2c_identify;
	330	INIT_LIST_HEAD(&i2c->ports);
	331
7dcd060c	332	while (!dcb_i2c_parse(bios, ++index, &info)) {
4196faa8 BS	333	if (info.type == DCB_I2C_UNUSED)
4196faa8 BS	334	continue;
6ee73861	335
7dcd060c BS	336	oclass = sclass;
	337	do {
	338	ret = -EINVAL;
	339	if (oclass->handle == info.type) {
	340	ret = nouveau_object_ctor(pobject, pobject,
	341	oclass, &info,
	342	index, &object);
4196faa8	343	}
7dcd060c	344	} while (ret && (++oclass)->handle);
6ee73861 BS	345	}
6ee73861 BS	346
5effecd4 BS	347	/* in addition to the busses specified in the i2c table, there
	348	* may be ddc/aux channels hiding behind external tmds/dp/etc
	349	* transmitters.
	350	*/
	351	index = ((index + 0x0f) / 0x10) * 0x10;
	352	i = -1;
	353	while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) {
	354	if (!outp.location \|\| !outp.extdev)
	355	continue;
	356
	357	switch (outp.type) {
	358	case DCB_OUTPUT_TMDS:
	359	info.type = NV_I2C_TYPE_EXTDDC(outp.extdev);
	360	break;
	361	case DCB_OUTPUT_DP:
	362	info.type = NV_I2C_TYPE_EXTAUX(outp.extdev);
	363	break;
	364	default:
	365	continue;
	366	}
	367
	368	ret = -ENODEV;
	369	j = -1;
	370	while (ret && ++j < ARRAY_SIZE(nouveau_i2c_extdev_sclass)) {
	371	parent = nv_object(i2c->find(i2c, outp.i2c_index));
	372	oclass = nouveau_i2c_extdev_sclass[j];
	373	do {
	374	if (oclass->handle != info.type)
	375	continue;
	376	ret = nouveau_object_ctor(parent, *pobject,
	377	oclass, NULL,
	378	index++, &object);
	379	} while (ret && (++oclass)->handle);
	380	}
	381	}
	382
6ee73861 BS	383	return 0;
6ee73861 BS	384	}