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212 lines
5.8 KiB
212 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Backlight code for ATI Radeon based graphic cards |
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* |
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* Copyright (c) 2000 Ani Joshi <[email protected]> |
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* Copyright (c) 2003 Benjamin Herrenschmidt <[email protected]> |
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* Copyright (c) 2006 Michael Hanselmann <[email protected]> |
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*/ |
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#include "radeonfb.h" |
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#include <linux/backlight.h> |
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#include <linux/slab.h> |
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#ifdef CONFIG_PMAC_BACKLIGHT |
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#include <asm/backlight.h> |
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#endif |
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#define MAX_RADEON_LEVEL 0xFF |
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struct radeon_bl_privdata { |
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struct radeonfb_info *rinfo; |
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uint8_t negative; |
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}; |
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static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata, |
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int level) |
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{ |
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int rlevel; |
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/* Get and convert the value */ |
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/* No locking of bl_curve since we read a single value */ |
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rlevel = pdata->rinfo->info->bl_curve[level] * |
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FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL; |
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if (rlevel < 0) |
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rlevel = 0; |
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else if (rlevel > MAX_RADEON_LEVEL) |
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rlevel = MAX_RADEON_LEVEL; |
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if (pdata->negative) |
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rlevel = MAX_RADEON_LEVEL - rlevel; |
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return rlevel; |
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} |
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static int radeon_bl_update_status(struct backlight_device *bd) |
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{ |
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struct radeon_bl_privdata *pdata = bl_get_data(bd); |
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struct radeonfb_info *rinfo = pdata->rinfo; |
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u32 lvds_gen_cntl, tmpPixclksCntl; |
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int level; |
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if (rinfo->mon1_type != MT_LCD) |
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return 0; |
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/* We turn off the LCD completely instead of just dimming the |
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* backlight. This provides some greater power saving and the display |
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* is useless without backlight anyway. |
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*/ |
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if (bd->props.power != FB_BLANK_UNBLANK || |
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bd->props.fb_blank != FB_BLANK_UNBLANK) |
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level = 0; |
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else |
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level = bd->props.brightness; |
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del_timer_sync(&rinfo->lvds_timer); |
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radeon_engine_idle(); |
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lvds_gen_cntl = INREG(LVDS_GEN_CNTL); |
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if (level > 0) { |
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lvds_gen_cntl &= ~LVDS_DISPLAY_DIS; |
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if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) { |
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lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON); |
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lvds_gen_cntl |= LVDS_BLON | LVDS_EN; |
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
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lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; |
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lvds_gen_cntl |= |
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(radeon_bl_get_level_brightness(pdata, level) << |
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LVDS_BL_MOD_LEVEL_SHIFT); |
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lvds_gen_cntl |= LVDS_ON; |
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lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN); |
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rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; |
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mod_timer(&rinfo->lvds_timer, |
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jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); |
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} else { |
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lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; |
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lvds_gen_cntl |= |
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(radeon_bl_get_level_brightness(pdata, level) << |
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LVDS_BL_MOD_LEVEL_SHIFT); |
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
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} |
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rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; |
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rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl |
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& LVDS_STATE_MASK; |
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} else { |
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/* Asic bug, when turning off LVDS_ON, we have to make sure |
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RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off |
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*/ |
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tmpPixclksCntl = INPLL(PIXCLKS_CNTL); |
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if (rinfo->is_mobility || rinfo->is_IGP) |
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OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb); |
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lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN); |
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lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) << |
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LVDS_BL_MOD_LEVEL_SHIFT); |
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lvds_gen_cntl |= LVDS_DISPLAY_DIS; |
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
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udelay(100); |
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lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN); |
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
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lvds_gen_cntl &= ~(LVDS_DIGON); |
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rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; |
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mod_timer(&rinfo->lvds_timer, |
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jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); |
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if (rinfo->is_mobility || rinfo->is_IGP) |
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OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl); |
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} |
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rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; |
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rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK); |
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return 0; |
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} |
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static const struct backlight_ops radeon_bl_data = { |
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.update_status = radeon_bl_update_status, |
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}; |
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void radeonfb_bl_init(struct radeonfb_info *rinfo) |
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{ |
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struct backlight_properties props; |
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struct backlight_device *bd; |
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struct radeon_bl_privdata *pdata; |
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char name[12]; |
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if (rinfo->mon1_type != MT_LCD) |
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return; |
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#ifdef CONFIG_PMAC_BACKLIGHT |
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if (!pmac_has_backlight_type("ati") && |
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!pmac_has_backlight_type("mnca")) |
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return; |
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#endif |
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pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL); |
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if (!pdata) { |
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printk("radeonfb: Memory allocation failed\n"); |
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goto error; |
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} |
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snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node); |
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memset(&props, 0, sizeof(struct backlight_properties)); |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = FB_BACKLIGHT_LEVELS - 1; |
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bd = backlight_device_register(name, rinfo->info->dev, pdata, |
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&radeon_bl_data, &props); |
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if (IS_ERR(bd)) { |
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rinfo->info->bl_dev = NULL; |
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printk("radeonfb: Backlight registration failed\n"); |
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goto error; |
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} |
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pdata->rinfo = rinfo; |
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/* Pardon me for that hack... maybe some day we can figure out in what |
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* direction backlight should work on a given panel? |
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*/ |
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pdata->negative = |
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(rinfo->family != CHIP_FAMILY_RV200 && |
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rinfo->family != CHIP_FAMILY_RV250 && |
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rinfo->family != CHIP_FAMILY_RV280 && |
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rinfo->family != CHIP_FAMILY_RV350); |
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#ifdef CONFIG_PMAC_BACKLIGHT |
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pdata->negative = pdata->negative || |
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of_machine_is_compatible("PowerBook4,3") || |
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of_machine_is_compatible("PowerBook6,3") || |
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of_machine_is_compatible("PowerBook6,5"); |
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#endif |
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rinfo->info->bl_dev = bd; |
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fb_bl_default_curve(rinfo->info, 0, |
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63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL, |
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217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL); |
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bd->props.brightness = bd->props.max_brightness; |
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bd->props.power = FB_BLANK_UNBLANK; |
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backlight_update_status(bd); |
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printk("radeonfb: Backlight initialized (%s)\n", name); |
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return; |
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error: |
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kfree(pdata); |
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return; |
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} |
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void radeonfb_bl_exit(struct radeonfb_info *rinfo) |
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{ |
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struct backlight_device *bd = rinfo->info->bl_dev; |
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if (bd) { |
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struct radeon_bl_privdata *pdata; |
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pdata = bl_get_data(bd); |
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backlight_device_unregister(bd); |
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kfree(pdata); |
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rinfo->info->bl_dev = NULL; |
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printk("radeonfb: Backlight unloaded\n"); |
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} |
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}
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