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190 lines
4.5 KiB
190 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Backlight code for via-pmu |
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* |
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* Copyright (C) 1998 Paul Mackerras and Fabio Riccardi. |
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* Copyright (C) 2001-2002 Benjamin Herrenschmidt |
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* Copyright (C) 2006 Michael Hanselmann <[email protected]> |
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* |
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*/ |
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#include <asm/ptrace.h> |
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#include <linux/adb.h> |
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#include <linux/pmu.h> |
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#include <asm/backlight.h> |
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#include <asm/prom.h> |
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#define MAX_PMU_LEVEL 0xFF |
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static const struct backlight_ops pmu_backlight_data; |
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static DEFINE_SPINLOCK(pmu_backlight_lock); |
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static int sleeping, uses_pmu_bl; |
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static u8 bl_curve[FB_BACKLIGHT_LEVELS]; |
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static void pmu_backlight_init_curve(u8 off, u8 min, u8 max) |
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{ |
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int i, flat, count, range = (max - min); |
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bl_curve[0] = off; |
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for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat) |
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bl_curve[flat] = min; |
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count = FB_BACKLIGHT_LEVELS * 15 / 16; |
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for (i = 0; i < count; ++i) |
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bl_curve[flat + i] = min + (range * (i + 1) / count); |
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} |
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static int pmu_backlight_curve_lookup(int value) |
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{ |
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int level = (FB_BACKLIGHT_LEVELS - 1); |
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int i, max = 0; |
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/* Look for biggest value */ |
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for (i = 0; i < FB_BACKLIGHT_LEVELS; i++) |
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max = max((int)bl_curve[i], max); |
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/* Look for nearest value */ |
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for (i = 0; i < FB_BACKLIGHT_LEVELS; i++) { |
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int diff = abs(bl_curve[i] - value); |
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if (diff < max) { |
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max = diff; |
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level = i; |
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} |
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} |
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return level; |
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} |
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static int pmu_backlight_get_level_brightness(int level) |
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{ |
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int pmulevel; |
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/* Get and convert the value */ |
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pmulevel = bl_curve[level] * FB_BACKLIGHT_MAX / MAX_PMU_LEVEL; |
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if (pmulevel < 0) |
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pmulevel = 0; |
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else if (pmulevel > MAX_PMU_LEVEL) |
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pmulevel = MAX_PMU_LEVEL; |
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return pmulevel; |
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} |
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static int __pmu_backlight_update_status(struct backlight_device *bd) |
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{ |
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struct adb_request req; |
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int level = bd->props.brightness; |
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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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if (level > 0) { |
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int pmulevel = pmu_backlight_get_level_brightness(level); |
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pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT, pmulevel); |
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pmu_wait_complete(&req); |
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pmu_request(&req, NULL, 2, PMU_POWER_CTRL, |
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PMU_POW_BACKLIGHT | PMU_POW_ON); |
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pmu_wait_complete(&req); |
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} else { |
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pmu_request(&req, NULL, 2, PMU_POWER_CTRL, |
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PMU_POW_BACKLIGHT | PMU_POW_OFF); |
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pmu_wait_complete(&req); |
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} |
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return 0; |
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} |
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static int pmu_backlight_update_status(struct backlight_device *bd) |
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{ |
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unsigned long flags; |
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int rc = 0; |
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spin_lock_irqsave(&pmu_backlight_lock, flags); |
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/* Don't update brightness when sleeping */ |
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if (!sleeping) |
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rc = __pmu_backlight_update_status(bd); |
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spin_unlock_irqrestore(&pmu_backlight_lock, flags); |
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return rc; |
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} |
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static const struct backlight_ops pmu_backlight_data = { |
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.update_status = pmu_backlight_update_status, |
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}; |
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#ifdef CONFIG_PM |
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void pmu_backlight_set_sleep(int sleep) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&pmu_backlight_lock, flags); |
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sleeping = sleep; |
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if (pmac_backlight && uses_pmu_bl) { |
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if (sleep) { |
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struct adb_request req; |
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pmu_request(&req, NULL, 2, PMU_POWER_CTRL, |
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PMU_POW_BACKLIGHT | PMU_POW_OFF); |
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pmu_wait_complete(&req); |
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} else |
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__pmu_backlight_update_status(pmac_backlight); |
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} |
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spin_unlock_irqrestore(&pmu_backlight_lock, flags); |
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} |
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#endif /* CONFIG_PM */ |
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void __init pmu_backlight_init(void) |
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{ |
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struct backlight_properties props; |
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struct backlight_device *bd; |
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char name[10]; |
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int level, autosave; |
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/* Special case for the old PowerBook since I can't test on it */ |
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autosave = |
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of_machine_is_compatible("AAPL,3400/2400") || |
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of_machine_is_compatible("AAPL,3500"); |
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if (!autosave && |
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!pmac_has_backlight_type("pmu") && |
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!of_machine_is_compatible("AAPL,PowerBook1998") && |
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!of_machine_is_compatible("PowerBook1,1")) |
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return; |
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snprintf(name, sizeof(name), "pmubl"); |
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memset(&props, 0, sizeof(struct backlight_properties)); |
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props.type = BACKLIGHT_PLATFORM; |
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props.max_brightness = FB_BACKLIGHT_LEVELS - 1; |
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bd = backlight_device_register(name, NULL, NULL, &pmu_backlight_data, |
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&props); |
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if (IS_ERR(bd)) { |
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printk(KERN_ERR "PMU Backlight registration failed\n"); |
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return; |
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} |
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uses_pmu_bl = 1; |
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pmu_backlight_init_curve(0x7F, 0x46, 0x0E); |
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level = bd->props.max_brightness; |
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if (autosave) { |
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/* read autosaved value if available */ |
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struct adb_request req; |
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pmu_request(&req, NULL, 2, 0xd9, 0); |
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pmu_wait_complete(&req); |
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level = pmu_backlight_curve_lookup( |
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(req.reply[0] >> 4) * |
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bd->props.max_brightness / 15); |
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} |
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bd->props.brightness = level; |
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bd->props.power = FB_BLANK_UNBLANK; |
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backlight_update_status(bd); |
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printk(KERN_INFO "PMU Backlight initialized (%s)\n", name); |
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}
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