1 files changed, 221 insertions, 0 deletions

diff --git a/drivers/video/fbdev/aty/radeon_backlight.c b/drivers/video/fbdev/aty/radeon_backlight.c
new file mode 100644
index 000000000000..db572df7e1ef
--- /dev/null
+++ b/drivers/video/fbdev/aty/radeon_backlight.c
@@ -0,0 +1,221 @@
+/*
+ * Backlight code for ATI Radeon based graphic cards
+ *
+ * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org>
+ * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "radeonfb.h"
+#include <linux/backlight.h>
+#include <linux/slab.h>
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
+
+#define MAX_RADEON_LEVEL 0xFF
+
+struct radeon_bl_privdata {
+        struct radeonfb_info *rinfo;
+        uint8_t negative;
+};
+
+static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
+                int level)
+{
+        int rlevel;
+
+        /* Get and convert the value */
+        /* No locking of bl_curve since we read a single value */
+        rlevel = pdata->rinfo->info->bl_curve[level] *
+                 FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
+
+        if (rlevel < 0)
+                rlevel = 0;
+        else if (rlevel > MAX_RADEON_LEVEL)
+                rlevel = MAX_RADEON_LEVEL;
+
+        if (pdata->negative)
+                rlevel = MAX_RADEON_LEVEL - rlevel;
+
+        return rlevel;
+}
+
+static int radeon_bl_update_status(struct backlight_device *bd)
+{
+        struct radeon_bl_privdata *pdata = bl_get_data(bd);
+        struct radeonfb_info *rinfo = pdata->rinfo;
+        u32 lvds_gen_cntl, tmpPixclksCntl;
+        int level;
+
+        if (rinfo->mon1_type != MT_LCD)
+                return 0;
+
+        /* We turn off the LCD completely instead of just dimming the
+         * backlight. This provides some greater power saving and the display
+         * is useless without backlight anyway.
+         */
+        if (bd->props.power != FB_BLANK_UNBLANK ||
+            bd->props.fb_blank != FB_BLANK_UNBLANK)
+                level = 0;
+        else
+                level = bd->props.brightness;
+
+        del_timer_sync(&rinfo->lvds_timer);
+        radeon_engine_idle();
+
+        lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
+        if (level > 0) {
+                lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
+                if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
+                        lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
+                        lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
+                        OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+                        lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
+                        lvds_gen_cntl |=
+                                (radeon_bl_get_level_brightness(pdata, level) <<
+                                 LVDS_BL_MOD_LEVEL_SHIFT);
+                        lvds_gen_cntl |= LVDS_ON;
+                        lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
+                        rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
+                        mod_timer(&rinfo->lvds_timer,
+                                  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
+                } else {
+                        lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
+                        lvds_gen_cntl |=
+                                (radeon_bl_get_level_brightness(pdata, level) <<
+                                 LVDS_BL_MOD_LEVEL_SHIFT);
+                        OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+                }
+                rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
+                rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
+                        & LVDS_STATE_MASK;
+        } else {
+                /* Asic bug, when turning off LVDS_ON, we have to make sure
+                   RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off
+                */
+                tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
+                if (rinfo->is_mobility || rinfo->is_IGP)
+                        OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
+                lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
+                lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<
+                                  LVDS_BL_MOD_LEVEL_SHIFT);
+                lvds_gen_cntl |= LVDS_DISPLAY_DIS;
+                OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+                udelay(100);
+                lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
+                OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+                lvds_gen_cntl &= ~(LVDS_DIGON);
+                rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
+                mod_timer(&rinfo->lvds_timer,
+                          jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
+                if (rinfo->is_mobility || rinfo->is_IGP)
+                        OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
+        }
+        rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
+        rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);
+
+        return 0;
+}
+
+static int radeon_bl_get_brightness(struct backlight_device *bd)
+{
+        return bd->props.brightness;
+}
+
+static const struct backlight_ops radeon_bl_data = {
+        .get_brightness = radeon_bl_get_brightness,
+        .update_status  = radeon_bl_update_status,
+};
+
+void radeonfb_bl_init(struct radeonfb_info *rinfo)
+{
+        struct backlight_properties props;
+        struct backlight_device *bd;
+        struct radeon_bl_privdata *pdata;
+        char name[12];
+
+        if (rinfo->mon1_type != MT_LCD)
+                return;
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+        if (!pmac_has_backlight_type("ati") &&
+            !pmac_has_backlight_type("mnca"))
+                return;
+#endif
+
+        pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);
+        if (!pdata) {
+                printk("radeonfb: Memory allocation failed\n");
+                goto error;
+        }
+
+        snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);
+
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.type = BACKLIGHT_RAW;
+        props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
+        bd = backlight_device_register(name, rinfo->info->dev, pdata,
+                                       &radeon_bl_data, &props);
+        if (IS_ERR(bd)) {
+                rinfo->info->bl_dev = NULL;
+                printk("radeonfb: Backlight registration failed\n");
+                goto error;
+        }
+
+        pdata->rinfo = rinfo;
+
+        /* Pardon me for that hack... maybe some day we can figure out in what
+         * direction backlight should work on a given panel?
+         */
+        pdata->negative =
+                (rinfo->family != CHIP_FAMILY_RV200 &&
+                 rinfo->family != CHIP_FAMILY_RV250 &&
+                 rinfo->family != CHIP_FAMILY_RV280 &&
+                 rinfo->family != CHIP_FAMILY_RV350);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+        pdata->negative = pdata->negative ||
+                of_machine_is_compatible("PowerBook4,3") ||
+                of_machine_is_compatible("PowerBook6,3") ||
+                of_machine_is_compatible("PowerBook6,5");
+#endif
+
+        rinfo->info->bl_dev = bd;
+        fb_bl_default_curve(rinfo->info, 0,
+                 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,
+                217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
+
+        bd->props.brightness = bd->props.max_brightness;
+        bd->props.power = FB_BLANK_UNBLANK;
+        backlight_update_status(bd);
+
+        printk("radeonfb: Backlight initialized (%s)\n", name);
+
+        return;
+
+error:
+        kfree(pdata);
+        return;
+}
+
+void radeonfb_bl_exit(struct radeonfb_info *rinfo)
+{
+        struct backlight_device *bd = rinfo->info->bl_dev;
+
+        if (bd) {
+                struct radeon_bl_privdata *pdata;
+
+                pdata = bl_get_data(bd);
+                backlight_device_unregister(bd);
+                kfree(pdata);
+                rinfo->info->bl_dev = NULL;
+
+                printk("radeonfb: Backlight unloaded\n");
+        }
+}