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authorMichael Hanselmann <linux-kernel@hansmi.ch>2006-06-25 05:47:08 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:00:59 -0700
commit5474c120aafe78ca54bf272f7a01107c42da2b21 (patch)
treec1b002a27703ce92c816bfb9844752186e33d403 /drivers/video/aty/radeon_backlight.c
parent17660bdd5c1f1a165273c1a59cb5b87670a81cc4 (diff)
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[PATCH] Rewritten backlight infrastructure for portable Apple computers
This patch contains a total rewrite of the backlight infrastructure for portable Apple computers. Backward compatibility is retained. A sysfs interface allows userland to control the brightness with more steps than before. Userland is allowed to upload a brightness curve for different monitors, similar to Mac OS X. [akpm@osdl.org: add needed exports] Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/aty/radeon_backlight.c')
-rw-r--r--drivers/video/aty/radeon_backlight.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/video/aty/radeon_backlight.c b/drivers/video/aty/radeon_backlight.c
new file mode 100644
index 00000000000..7de66b855d4
--- /dev/null
+++ b/drivers/video/aty/radeon_backlight.c
@@ -0,0 +1,247 @@
+/*
+ * 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>
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
+
+#define MAX_RADEON_LEVEL 0xFF
+
+static struct backlight_properties radeon_bl_data;
+
+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)
+{
+ struct fb_info *info = pdata->rinfo->info;
+ int rlevel;
+
+ mutex_lock(&info->bl_mutex);
+
+ /* Get and convert the value */
+ rlevel = pdata->rinfo->info->bl_curve[level] *
+ FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
+
+ mutex_unlock(&info->bl_mutex);
+
+ if (pdata->negative)
+ rlevel = MAX_RADEON_LEVEL - rlevel;
+
+ if (rlevel < 0)
+ rlevel = 0;
+ else if (rlevel > MAX_RADEON_LEVEL)
+ rlevel = MAX_RADEON_LEVEL;
+
+ return rlevel;
+}
+
+static int radeon_bl_update_status(struct backlight_device *bd)
+{
+ struct radeon_bl_privdata *pdata = class_get_devdata(&bd->class_dev);
+ 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 struct backlight_properties radeon_bl_data = {
+ .owner = THIS_MODULE,
+ .get_brightness = radeon_bl_get_brightness,
+ .update_status = radeon_bl_update_status,
+ .max_brightness = (FB_BACKLIGHT_LEVELS - 1),
+};
+
+void radeonfb_bl_init(struct radeonfb_info *rinfo)
+{
+ 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);
+
+ bd = backlight_device_register(name, pdata, &radeon_bl_data);
+ 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 ||
+ machine_is_compatible("PowerBook4,3") ||
+ machine_is_compatible("PowerBook6,3") ||
+ machine_is_compatible("PowerBook6,5");
+#endif
+
+ mutex_lock(&rinfo->info->bl_mutex);
+ 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);
+ mutex_unlock(&rinfo->info->bl_mutex);
+
+ up(&bd->sem);
+ bd->props->brightness = radeon_bl_data.max_brightness;
+ bd->props->power = FB_BLANK_UNBLANK;
+ bd->props->update_status(bd);
+ down(&bd->sem);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+ mutex_lock(&pmac_backlight_mutex);
+ if (!pmac_backlight)
+ pmac_backlight = bd;
+ mutex_unlock(&pmac_backlight_mutex);
+#endif
+
+ printk("radeonfb: Backlight initialized (%s)\n", name);
+
+ return;
+
+error:
+ kfree(pdata);
+ return;
+}
+
+void radeonfb_bl_exit(struct radeonfb_info *rinfo)
+{
+#ifdef CONFIG_PMAC_BACKLIGHT
+ mutex_lock(&pmac_backlight_mutex);
+#endif
+
+ mutex_lock(&rinfo->info->bl_mutex);
+ if (rinfo->info->bl_dev) {
+ struct radeon_bl_privdata *pdata;
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+ if (pmac_backlight == rinfo->info->bl_dev)
+ pmac_backlight = NULL;
+#endif
+
+ pdata = class_get_devdata(&rinfo->info->bl_dev->class_dev);
+ backlight_device_unregister(rinfo->info->bl_dev);
+ kfree(pdata);
+ rinfo->info->bl_dev = NULL;
+
+ printk("radeonfb: Backlight unloaded\n");
+ }
+ mutex_unlock(&rinfo->info->bl_mutex);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+ mutex_unlock(&pmac_backlight_mutex);
+#endif
+}