drivers/gpu/drm/nouveau/core/subdev/i2c/base.c - pub/scm/linux/kernel/git/paulg/linux-stable - Git at Google

 /*
  * 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 = &device->pdev->dev;
 	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;
 }
	/*
	* 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 = &device->pdev->dev;
	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;
	}