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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Backlight code for ATI Radeon based graphic cards4 *5 * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org>6 * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>7 * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>8 */9 10#include "radeonfb.h"11#include <linux/backlight.h>12#include <linux/slab.h>13 14#ifdef CONFIG_PMAC_BACKLIGHT15#include <asm/backlight.h>16#endif17 18#define MAX_RADEON_LEVEL 0xFF19 20struct radeon_bl_privdata {21	struct radeonfb_info *rinfo;22	uint8_t negative;23};24 25static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,26		int level)27{28	int rlevel;29 30	/* Get and convert the value */31	/* No locking of bl_curve since we read a single value */32	rlevel = pdata->rinfo->info->bl_curve[level] *33		 FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;34 35	if (rlevel < 0)36		rlevel = 0;37	else if (rlevel > MAX_RADEON_LEVEL)38		rlevel = MAX_RADEON_LEVEL;39 40	if (pdata->negative)41		rlevel = MAX_RADEON_LEVEL - rlevel;42 43	return rlevel;44}45 46static int radeon_bl_update_status(struct backlight_device *bd)47{48	struct radeon_bl_privdata *pdata = bl_get_data(bd);49	struct radeonfb_info *rinfo = pdata->rinfo;50	u32 lvds_gen_cntl, tmpPixclksCntl;51	int level;52 53	if (rinfo->mon1_type != MT_LCD)54		return 0;55 56	/* We turn off the LCD completely instead of just dimming the57	 * backlight. This provides some greater power saving and the display58	 * is useless without backlight anyway.59	 */60	level = backlight_get_brightness(bd);61 62	del_timer_sync(&rinfo->lvds_timer);63	radeon_engine_idle();64 65	lvds_gen_cntl = INREG(LVDS_GEN_CNTL);66	if (level > 0) {67		lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;68		if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {69			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);70			lvds_gen_cntl |= LVDS_BLON | LVDS_EN;71			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);72			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;73			lvds_gen_cntl |=74				(radeon_bl_get_level_brightness(pdata, level) <<75				 LVDS_BL_MOD_LEVEL_SHIFT);76			lvds_gen_cntl |= LVDS_ON;77			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);78			rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;79			mod_timer(&rinfo->lvds_timer,80				  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));81		} else {82			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;83			lvds_gen_cntl |=84				(radeon_bl_get_level_brightness(pdata, level) <<85				 LVDS_BL_MOD_LEVEL_SHIFT);86			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);87		}88		rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;89		rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl90			& LVDS_STATE_MASK;91	} else {92		/* Asic bug, when turning off LVDS_ON, we have to make sure93		   RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off94		*/95		tmpPixclksCntl = INPLL(PIXCLKS_CNTL);96		if (rinfo->is_mobility || rinfo->is_IGP)97			OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);98		lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);99		lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<100				  LVDS_BL_MOD_LEVEL_SHIFT);101		lvds_gen_cntl |= LVDS_DISPLAY_DIS;102		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);103		udelay(100);104		lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);105		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);106		lvds_gen_cntl &= ~(LVDS_DIGON);107		rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;108		mod_timer(&rinfo->lvds_timer,109			  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));110		if (rinfo->is_mobility || rinfo->is_IGP)111			OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);112	}113	rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;114	rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);115 116	return 0;117}118 119static const struct backlight_ops radeon_bl_data = {120	.update_status	= radeon_bl_update_status,121};122 123void radeonfb_bl_init(struct radeonfb_info *rinfo)124{125	struct backlight_properties props;126	struct backlight_device *bd;127	struct radeon_bl_privdata *pdata;128	char name[12];129 130	if (rinfo->mon1_type != MT_LCD)131		return;132 133#ifdef CONFIG_PMAC_BACKLIGHT134	if (!pmac_has_backlight_type("ati") &&135	    !pmac_has_backlight_type("mnca"))136		return;137#endif138 139	pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);140	if (!pdata) {141		printk("radeonfb: Memory allocation failed\n");142		goto error;143	}144 145	snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);146 147	memset(&props, 0, sizeof(struct backlight_properties));148	props.type = BACKLIGHT_RAW;149	props.max_brightness = FB_BACKLIGHT_LEVELS - 1;150	bd = backlight_device_register(name, rinfo->info->device, pdata,151				       &radeon_bl_data, &props);152	if (IS_ERR(bd)) {153		rinfo->info->bl_dev = NULL;154		printk("radeonfb: Backlight registration failed\n");155		goto error;156	}157 158	pdata->rinfo = rinfo;159 160	/* Pardon me for that hack... maybe some day we can figure out in what161	 * direction backlight should work on a given panel?162	 */163	pdata->negative =164		(rinfo->family != CHIP_FAMILY_RV200 &&165		 rinfo->family != CHIP_FAMILY_RV250 &&166		 rinfo->family != CHIP_FAMILY_RV280 &&167		 rinfo->family != CHIP_FAMILY_RV350);168 169#ifdef CONFIG_PMAC_BACKLIGHT170	pdata->negative = pdata->negative ||171		of_machine_is_compatible("PowerBook4,3") ||172		of_machine_is_compatible("PowerBook6,3") ||173		of_machine_is_compatible("PowerBook6,5");174#endif175 176	rinfo->info->bl_dev = bd;177	fb_bl_default_curve(rinfo->info, 0,178		 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,179		217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);180 181	bd->props.brightness = bd->props.max_brightness;182	bd->props.power = FB_BLANK_UNBLANK;183	backlight_update_status(bd);184 185	printk("radeonfb: Backlight initialized (%s)\n", name);186 187	return;188 189error:190	kfree(pdata);191	return;192}193 194void radeonfb_bl_exit(struct radeonfb_info *rinfo)195{196	struct backlight_device *bd = rinfo->info->bl_dev;197 198	if (bd) {199		struct radeon_bl_privdata *pdata;200 201		pdata = bl_get_data(bd);202		backlight_device_unregister(bd);203		kfree(pdata);204		rinfo->info->bl_dev = NULL;205 206		printk("radeonfb: Backlight unloaded\n");207	}208}209