1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Backlight code for ATI Radeon based graphic cards 4 * 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_BACKLIGHT 15 #include <asm/backlight.h> 16 #endif 17 18 #define MAX_RADEON_LEVEL 0xFF 19 20 struct radeon_bl_privdata { 21 struct radeonfb_info *rinfo; 22 uint8_t negative; 23 }; 24 25 static 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 46 static 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 the 57 * backlight. This provides some greater power saving and the display 58 * 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_cntl 90 & LVDS_STATE_MASK; 91 } else { 92 /* Asic bug, when turning off LVDS_ON, we have to make sure 93 RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off 94 */ 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 } 118 119 static const struct backlight_ops radeon_bl_data = { 120 .update_status = radeon_bl_update_status, 121 }; 122 123 void 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_BACKLIGHT 134 if (!pmac_has_backlight_type("ati") && 135 !pmac_has_backlight_type("mnca")) 136 return; 137 #endif 138 139 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->dev, 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 what 161 * 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_BACKLIGHT 170 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 #endif 175 176 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; 188 189 error: 190 kfree(pdata); 191 return; 192 } 193 194 void 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