drivers/gpu/drm/nouveau/nouveau_backlight.c - linux - Git at Google

 /*
  * Copyright (C) 2009 Red Hat <mjg@redhat.com>
  *
  * 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 (including the
  * next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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:
  *  Matthew Garrett <mjg@redhat.com>
  *
  * Register locations derived from NVClock by Roderick Colenbrander
  */

 #include <linux/apple-gmux.h>
 #include <linux/backlight.h>
 #include <linux/idr.h>

 #include "nouveau_drv.h"
 #include "nouveau_reg.h"
 #include "nouveau_encoder.h"

 static struct ida bl_ida;
 #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'

 struct backlight_connector {
 	struct list_head head;
 	int id;
 };

 static bool
 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], struct backlight_connector
 		*connector)
 {
 	const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
 	if (nb < 0 || nb >= 100)
 		return false;
 	if (nb > 0)
 		snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
 	else
 		snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
 	connector->id = nb;
 	return true;
 }

 static int
 nv40_get_intensity(struct backlight_device *bd)
 {
 	struct nouveau_drm *drm = bl_get_data(bd);
 	struct nvif_object *device = &drm->client.device.object;
 	int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
 				   NV40_PMC_BACKLIGHT_MASK) >> 16;

 	return val;
 }

 static int
 nv40_set_intensity(struct backlight_device *bd)
 {
 	struct nouveau_drm *drm = bl_get_data(bd);
 	struct nvif_object *device = &drm->client.device.object;
 	int val = bd->props.brightness;
 	int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);

 	nvif_wr32(device, NV40_PMC_BACKLIGHT,
 		 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));

 	return 0;
 }

 static const struct backlight_ops nv40_bl_ops = {
 	.options = BL_CORE_SUSPENDRESUME,
 	.get_brightness = nv40_get_intensity,
 	.update_status = nv40_set_intensity,
 };

 static int
 nv40_backlight_init(struct drm_connector *connector)
 {
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 	struct nvif_object *device = &drm->client.device.object;
 	struct backlight_properties props;
 	struct backlight_device *bd;
 	struct backlight_connector bl_connector;
 	char backlight_name[BL_NAME_SIZE];

 	if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
 		return 0;

 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.max_brightness = 31;
 	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
 		NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
 		return 0;
 	}
 	bd = backlight_device_register(backlight_name , connector->kdev, drm,
 				       &nv40_bl_ops, &props);

 	if (IS_ERR(bd)) {
 		if (bl_connector.id > 0)
 			ida_simple_remove(&bl_ida, bl_connector.id);
 		return PTR_ERR(bd);
 	}
 	list_add(&bl_connector.head, &drm->bl_connectors);
 	drm->backlight = bd;
 	bd->props.brightness = nv40_get_intensity(bd);
 	backlight_update_status(bd);

 	return 0;
 }

 static int
 nv50_get_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
 	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div = 1025;
 	u32 val;

 	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
 	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
 	return ((val * 100) + (div / 2)) / div;
 }

 static int
 nv50_set_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
 	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div = 1025;
 	u32 val = (bd->props.brightness * div) / 100;

 	nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
 			NV50_PDISP_SOR_PWM_CTL_NEW | val);
 	return 0;
 }

 static const struct backlight_ops nv50_bl_ops = {
 	.options = BL_CORE_SUSPENDRESUME,
 	.get_brightness = nv50_get_intensity,
 	.update_status = nv50_set_intensity,
 };

 static int
 nva3_get_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
 	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div, val;

 	div  = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
 	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
 	if (div && div >= val)
 		return ((val * 100) + (div / 2)) / div;

 	return 100;
 }

 static int
 nva3_set_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
 	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div, val;

 	div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 	val = (bd->props.brightness * div) / 100;
 	if (div) {
 		nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
 				NV50_PDISP_SOR_PWM_CTL_NEW |
 				NVA3_PDISP_SOR_PWM_CTL_UNK);
 		return 0;
 	}

 	return -EINVAL;
 }

 static const struct backlight_ops nva3_bl_ops = {
 	.options = BL_CORE_SUSPENDRESUME,
 	.get_brightness = nva3_get_intensity,
 	.update_status = nva3_set_intensity,
 };

 static int
 nv50_backlight_init(struct drm_connector *connector)
 {
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 	struct nvif_object *device = &drm->client.device.object;
 	struct nouveau_encoder *nv_encoder;
 	struct backlight_properties props;
 	struct backlight_device *bd;
 	const struct backlight_ops *ops;
 	struct backlight_connector bl_connector;
 	char backlight_name[BL_NAME_SIZE];

 	nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
 	if (!nv_encoder) {
 		nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
 		if (!nv_encoder)
 			return -ENODEV;
 	}

 	if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)))
 		return 0;

 	if (drm->client.device.info.chipset <= 0xa0 ||
 	    drm->client.device.info.chipset == 0xaa ||
 	    drm->client.device.info.chipset == 0xac)
 		ops = &nv50_bl_ops;
 	else
 		ops = &nva3_bl_ops;

 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.max_brightness = 100;
 	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
 		NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
 		return 0;
 	}
 	bd = backlight_device_register(backlight_name , connector->kdev,
 				       nv_encoder, ops, &props);

 	if (IS_ERR(bd)) {
 		if (bl_connector.id > 0)
 			ida_simple_remove(&bl_ida, bl_connector.id);
 		return PTR_ERR(bd);
 	}

 	list_add(&bl_connector.head, &drm->bl_connectors);
 	drm->backlight = bd;
 	bd->props.brightness = bd->ops->get_brightness(bd);
 	backlight_update_status(bd);
 	return 0;
 }

 int
 nouveau_backlight_init(struct drm_device *dev)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct nvif_device *device = &drm->client.device;
 	struct drm_connector *connector;

 	INIT_LIST_HEAD(&drm->bl_connectors);

 	if (apple_gmux_present()) {
 		NV_INFO(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
 		return 0;
 	}

 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
 		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
 			continue;

 		switch (device->info.family) {
 		case NV_DEVICE_INFO_V0_CURIE:
 			return nv40_backlight_init(connector);
 		case NV_DEVICE_INFO_V0_TESLA:
 		case NV_DEVICE_INFO_V0_FERMI:
 		case NV_DEVICE_INFO_V0_KEPLER:
 		case NV_DEVICE_INFO_V0_MAXWELL:
 			return nv50_backlight_init(connector);
 		default:
 			break;
 		}
 	}


 	return 0;
 }

 void
 nouveau_backlight_exit(struct drm_device *dev)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct backlight_connector *connector;

 	list_for_each_entry(connector, &drm->bl_connectors, head) {
 		if (connector->id >= 0)
 			ida_simple_remove(&bl_ida, connector->id);
 	}

 	if (drm->backlight) {
 		backlight_device_unregister(drm->backlight);
 		drm->backlight = NULL;
 	}
 }

 void
 nouveau_backlight_ctor(void)
 {
 	ida_init(&bl_ida);
 }

 void
 nouveau_backlight_dtor(void)
 {
 	ida_destroy(&bl_ida);
 }
	/*
	* Copyright (C) 2009 Red Hat <mjg@redhat.com>
	*
	* 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 (including the
	* next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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:
	* Matthew Garrett <mjg@redhat.com>
	*
	* Register locations derived from NVClock by Roderick Colenbrander
	*/

	#include <linux/apple-gmux.h>
	#include <linux/backlight.h>
	#include <linux/idr.h>

	#include "nouveau_drv.h"
	#include "nouveau_reg.h"
	#include "nouveau_encoder.h"

	static struct ida bl_ida;
	#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'

	struct backlight_connector {
	struct list_head head;
	int id;
	};

	static bool
	nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], struct backlight_connector
	*connector)
	{
	const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
	if (nb < 0 \|\| nb >= 100)
	return false;
	if (nb > 0)
	snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
	else
	snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
	connector->id = nb;
	return true;
	}

	static int
	nv40_get_intensity(struct backlight_device *bd)
	{
	struct nouveau_drm *drm = bl_get_data(bd);
	struct nvif_object *device = &drm->client.device.object;
	int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
	NV40_PMC_BACKLIGHT_MASK) >> 16;

	return val;
	}

	static int
	nv40_set_intensity(struct backlight_device *bd)
	{
	struct nouveau_drm *drm = bl_get_data(bd);
	struct nvif_object *device = &drm->client.device.object;
	int val = bd->props.brightness;
	int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);

	nvif_wr32(device, NV40_PMC_BACKLIGHT,
	(val << 16) \| (reg & ~NV40_PMC_BACKLIGHT_MASK));

	return 0;
	}

	static const struct backlight_ops nv40_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nv40_get_intensity,
	.update_status = nv40_set_intensity,
	};

	static int
	nv40_backlight_init(struct drm_connector *connector)
	{
	struct nouveau_drm *drm = nouveau_drm(connector->dev);
	struct nvif_object *device = &drm->client.device.object;
	struct backlight_properties props;
	struct backlight_device *bd;
	struct backlight_connector bl_connector;
	char backlight_name[BL_NAME_SIZE];

	if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
	return 0;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 31;
	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
	NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
	return 0;
	}
	bd = backlight_device_register(backlight_name , connector->kdev, drm,
	&nv40_bl_ops, &props);

	if (IS_ERR(bd)) {
	if (bl_connector.id > 0)
	ida_simple_remove(&bl_ida, bl_connector.id);
	return PTR_ERR(bd);
	}
	list_add(&bl_connector.head, &drm->bl_connectors);
	drm->backlight = bd;
	bd->props.brightness = nv40_get_intensity(bd);
	backlight_update_status(bd);

	return 0;
	}

	static int
	nv50_get_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div = 1025;
	u32 val;

	val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
	return ((val * 100) + (div / 2)) / div;
	}

	static int
	nv50_set_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div = 1025;
	u32 val = (bd->props.brightness * div) / 100;

	nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
	NV50_PDISP_SOR_PWM_CTL_NEW \| val);
	return 0;
	}

	static const struct backlight_ops nv50_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nv50_get_intensity,
	.update_status = nv50_set_intensity,
	};

	static int
	nva3_get_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div, val;

	div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
	val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
	if (div && div >= val)
	return ((val * 100) + (div / 2)) / div;

	return 100;
	}

	static int
	nva3_set_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div, val;

	div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
	val = (bd->props.brightness * div) / 100;
	if (div) {
	nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val \|
	NV50_PDISP_SOR_PWM_CTL_NEW \|
	NVA3_PDISP_SOR_PWM_CTL_UNK);
	return 0;
	}

	return -EINVAL;
	}

	static const struct backlight_ops nva3_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nva3_get_intensity,
	.update_status = nva3_set_intensity,
	};

	static int
	nv50_backlight_init(struct drm_connector *connector)
	{
	struct nouveau_drm *drm = nouveau_drm(connector->dev);
	struct nvif_object *device = &drm->client.device.object;
	struct nouveau_encoder *nv_encoder;
	struct backlight_properties props;
	struct backlight_device *bd;
	const struct backlight_ops *ops;
	struct backlight_connector bl_connector;
	char backlight_name[BL_NAME_SIZE];

	nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
	if (!nv_encoder) {
	nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
	if (!nv_encoder)
	return -ENODEV;
	}

	if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)))
	return 0;

	if (drm->client.device.info.chipset <= 0xa0 \|\|
	drm->client.device.info.chipset == 0xaa \|\|
	drm->client.device.info.chipset == 0xac)
	ops = &nv50_bl_ops;
	else
	ops = &nva3_bl_ops;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 100;
	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
	NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
	return 0;
	}
	bd = backlight_device_register(backlight_name , connector->kdev,
	nv_encoder, ops, &props);

	if (IS_ERR(bd)) {
	if (bl_connector.id > 0)
	ida_simple_remove(&bl_ida, bl_connector.id);
	return PTR_ERR(bd);
	}

	list_add(&bl_connector.head, &drm->bl_connectors);
	drm->backlight = bd;
	bd->props.brightness = bd->ops->get_brightness(bd);
	backlight_update_status(bd);
	return 0;
	}

	int
	nouveau_backlight_init(struct drm_device *dev)
	{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvif_device *device = &drm->client.device;
	struct drm_connector *connector;

	INIT_LIST_HEAD(&drm->bl_connectors);

	if (apple_gmux_present()) {
	NV_INFO(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
	return 0;
	}

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
	connector->connector_type != DRM_MODE_CONNECTOR_eDP)
	continue;

	switch (device->info.family) {
	case NV_DEVICE_INFO_V0_CURIE:
	return nv40_backlight_init(connector);
	case NV_DEVICE_INFO_V0_TESLA:
	case NV_DEVICE_INFO_V0_FERMI:
	case NV_DEVICE_INFO_V0_KEPLER:
	case NV_DEVICE_INFO_V0_MAXWELL:
	return nv50_backlight_init(connector);
	default:
	break;
	}
	}


	return 0;
	}

	void
	nouveau_backlight_exit(struct drm_device *dev)
	{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct backlight_connector *connector;

	list_for_each_entry(connector, &drm->bl_connectors, head) {
	if (connector->id >= 0)
	ida_simple_remove(&bl_ida, connector->id);
	}

	if (drm->backlight) {
	backlight_device_unregister(drm->backlight);
	drm->backlight = NULL;
	}
	}

	void
	nouveau_backlight_ctor(void)
	{
	ida_init(&bl_ida);
	}

	void
	nouveau_backlight_dtor(void)
	{
	ida_destroy(&bl_ida);
	}