[mirror_ubuntu-zesty-kernel.git] / drivers / gpu / drm / nouveau / nouveau_backlight.c

/*
 * 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/backlight.h>
#include <linux/acpi.h>

#include "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_drm.h"
#include "nouveau_reg.h"

static int nv40_get_intensity(struct backlight_device *bd)
{
	struct drm_device *dev = bl_get_data(bd);
	int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
									>> 16;

	return val;
}

static int nv40_set_intensity(struct backlight_device *bd)
{
	struct drm_device *dev = bl_get_data(bd);
	int val = bd->props.brightness;
	int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);

	nv_wr32(dev, NV40_PMC_BACKLIGHT,
		 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));

	return 0;
}

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

static int nv50_get_intensity(struct backlight_device *bd)
{
	struct drm_device *dev = bl_get_data(bd);

	return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
}

static int nv50_set_intensity(struct backlight_device *bd)
{
	struct drm_device *dev = bl_get_data(bd);
	int val = bd->props.brightness;

	nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
		val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
	return 0;
}

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

static int nouveau_nv40_backlight_init(struct drm_device *dev)
{
	struct backlight_properties props;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct backlight_device *bd;

	if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
		return 0;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.max_brightness = 31;
	bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
				       &nv40_bl_ops, &props);
	if (IS_ERR(bd))
		return PTR_ERR(bd);

	dev_priv->backlight = bd;
	bd->props.brightness = nv40_get_intensity(bd);
	backlight_update_status(bd);

	return 0;
}

static int nouveau_nv50_backlight_init(struct drm_device *dev)
{
	struct backlight_properties props;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct backlight_device *bd;

	if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
		return 0;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.max_brightness = 1025;
	bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
				       &nv50_bl_ops, &props);
	if (IS_ERR(bd))
		return PTR_ERR(bd);

	dev_priv->backlight = bd;
	bd->props.brightness = nv50_get_intensity(bd);
	backlight_update_status(bd);
	return 0;
}

int nouveau_backlight_init(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

#ifdef CONFIG_ACPI
	if (acpi_video_backlight_support()) {
		NV_INFO(dev, "ACPI backlight interface available, "
			     "not registering our own\n");
		return 0;
	}
#endif

	switch (dev_priv->card_type) {
	case NV_40:
		return nouveau_nv40_backlight_init(dev);
	case NV_50:
		return nouveau_nv50_backlight_init(dev);
	default:
		break;
	}

	return 0;
}

void nouveau_backlight_exit(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	if (dev_priv->backlight) {
		backlight_device_unregister(dev_priv->backlight);
		dev_priv->backlight = NULL;
	}
}
Commit	Line	Data
6ee73861 BS	1	/*
	2	* Copyright (C) 2009 Red Hat <mjg@redhat.com>
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining
	5	* a copy of this software and associated documentation files (the
	6	* "Software"), to deal in the Software without restriction, including
	7	* without limitation the rights to use, copy, modify, merge, publish,
	8	* distribute, sublicense, and/or sell copies of the Software, and to
	9	* permit persons to whom the Software is furnished to do so, subject to
	10	* the following conditions:
	11	*
	12	* The above copyright notice and this permission notice (including the
	13	* next paragraph) shall be included in all copies or substantial
	14	* portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	17	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	18	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	19	* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
	20	* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	21	* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	22	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	23	*
	24	*/
	25
	26	/*
	27	* Authors:
	28	* Matthew Garrett <mjg@redhat.com>
	29	*
	30	* Register locations derived from NVClock by Roderick Colenbrander
	31	*/
	32
	33	#include <linux/backlight.h>
5bead799	34	#include <linux/acpi.h>
6ee73861 BS	35
	36	#include "drmP.h"
	37	#include "nouveau_drv.h"
	38	#include "nouveau_drm.h"
	39	#include "nouveau_reg.h"
	40
	41	static int nv40_get_intensity(struct backlight_device *bd)
	42	{
	43	struct drm_device *dev = bl_get_data(bd);
	44	int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
	45	>> 16;
	46
	47	return val;
	48	}
	49
	50	static int nv40_set_intensity(struct backlight_device *bd)
	51	{
	52	struct drm_device *dev = bl_get_data(bd);
	53	int val = bd->props.brightness;
	54	int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
	55
	56	nv_wr32(dev, NV40_PMC_BACKLIGHT,
	57	(val << 16) \| (reg & ~NV40_PMC_BACKLIGHT_MASK));
	58
	59	return 0;
	60	}
	61
	62	static struct backlight_ops nv40_bl_ops = {
	63	.options = BL_CORE_SUSPENDRESUME,
	64	.get_brightness = nv40_get_intensity,
	65	.update_status = nv40_set_intensity,
	66	};
	67
	68	static int nv50_get_intensity(struct backlight_device *bd)
	69	{
	70	struct drm_device *dev = bl_get_data(bd);
	71
	72	return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
	73	}
	74
	75	static int nv50_set_intensity(struct backlight_device *bd)
	76	{
	77	struct drm_device *dev = bl_get_data(bd);
	78	int val = bd->props.brightness;
	79
	80	nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
	81	val \| NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
	82	return 0;
	83	}
	84
	85	static struct backlight_ops nv50_bl_ops = {
	86	.options = BL_CORE_SUSPENDRESUME,
	87	.get_brightness = nv50_get_intensity,
	88	.update_status = nv50_set_intensity,
	89	};
	90
	91	static int nouveau_nv40_backlight_init(struct drm_device *dev)
	92	{
a19a6ee6	93	struct backlight_properties props;
6ee73861 BS	94	struct drm_nouveau_private *dev_priv = dev->dev_private;
	95	struct backlight_device *bd;
	96
	97	if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
	98	return 0;
	99
a19a6ee6 MG	100	memset(&props, 0, sizeof(struct backlight_properties));
a19a6ee6 MG	101	props.max_brightness = 31;
6ee73861	102	bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
a19a6ee6	103	&nv40_bl_ops, &props);
6ee73861 BS	104	if (IS_ERR(bd))
	105	return PTR_ERR(bd);
	106
	107	dev_priv->backlight = bd;
6ee73861 BS	108	bd->props.brightness = nv40_get_intensity(bd);
	109	backlight_update_status(bd);
	110
	111	return 0;
	112	}
	113
	114	static int nouveau_nv50_backlight_init(struct drm_device *dev)
	115	{
a19a6ee6	116	struct backlight_properties props;
6ee73861 BS	117	struct drm_nouveau_private *dev_priv = dev->dev_private;
	118	struct backlight_device *bd;
	119
	120	if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
	121	return 0;
	122
a19a6ee6 MG	123	memset(&props, 0, sizeof(struct backlight_properties));
a19a6ee6 MG	124	props.max_brightness = 1025;
6ee73861	125	bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
a19a6ee6	126	&nv50_bl_ops, &props);
6ee73861 BS	127	if (IS_ERR(bd))
	128	return PTR_ERR(bd);
	129
	130	dev_priv->backlight = bd;
6ee73861 BS	131	bd->props.brightness = nv50_get_intensity(bd);
	132	backlight_update_status(bd);
	133	return 0;
	134	}
	135
	136	int nouveau_backlight_init(struct drm_device *dev)
	137	{
	138	struct drm_nouveau_private *dev_priv = dev->dev_private;
	139
5bead799 BS	140	#ifdef CONFIG_ACPI
	141	if (acpi_video_backlight_support()) {
	142	NV_INFO(dev, "ACPI backlight interface available, "
	143	"not registering our own\n");
	144	return 0;
	145	}
	146	#endif
	147
6ee73861 BS	148	switch (dev_priv->card_type) {
	149	case NV_40:
	150	return nouveau_nv40_backlight_init(dev);
	151	case NV_50:
	152	return nouveau_nv50_backlight_init(dev);
	153	default:
	154	break;
	155	}
	156
	157	return 0;
	158	}
	159
	160	void nouveau_backlight_exit(struct drm_device *dev)
	161	{
	162	struct drm_nouveau_private *dev_priv = dev->dev_private;
	163
	164	if (dev_priv->backlight) {
	165	backlight_device_unregister(dev_priv->backlight);
	166	dev_priv->backlight = NULL;
	167	}
	168	}