151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*
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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 <linux-kernel@hansmi.ch>
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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 struct device_node *vias;
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static struct backlight_properties pmu_backlight_data;
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static int pmu_backlight_get_level_brightness(struct fb_info *info,
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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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mutex_lock(&info->bl_mutex);
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pmulevel = info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_PMU_LEVEL;
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mutex_unlock(&info->bl_mutex);
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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 fb_info *info = class_get_devdata(&bd->class_dev);
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struct adb_request req;
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int pmulevel, level = bd->props->brightness;
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if (vias == NULL)
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return -ENODEV;
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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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pmulevel = pmu_backlight_get_level_brightness(info, 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 | (level > 0 ? PMU_POW_ON : PMU_POW_OFF));
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pmu_wait_complete(&req);
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return 0;
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}
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static int pmu_backlight_get_brightness(struct backlight_device *bd)
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{
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return bd->props->brightness;
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}
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static struct backlight_properties pmu_backlight_data = {
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.owner = THIS_MODULE,
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.get_brightness = pmu_backlight_get_brightness,
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.update_status = pmu_backlight_update_status,
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.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
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};
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void __init pmu_backlight_init(struct device_node *in_vias)
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{
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struct backlight_device *bd;
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struct fb_info *info;
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char name[10];
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int level, autosave;
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vias = in_vias;
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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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machine_is_compatible("AAPL,3400/2400") ||
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machine_is_compatible("AAPL,3500");
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if (!autosave &&
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!pmac_has_backlight_type("pmu") &&
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!machine_is_compatible("AAPL,PowerBook1998") &&
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!machine_is_compatible("PowerBook1,1"))
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return;
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/* Actually, this is a hack, but I don't know of a better way
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* to get the first framebuffer device.
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*/
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info = registered_fb[0];
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if (!info) {
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printk("pmubl: No framebuffer found\n");
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goto error;
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}
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snprintf(name, sizeof(name), "pmubl%d", info->node);
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bd = backlight_device_register(name, info, &pmu_backlight_data);
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if (IS_ERR(bd)) {
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printk("pmubl: Backlight registration failed\n");
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goto error;
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}
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mutex_lock(&info->bl_mutex);
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info->bl_dev = bd;
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fb_bl_default_curve(info, 0x7F, 0x46, 0x0E);
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mutex_unlock(&info->bl_mutex);
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level = pmu_backlight_data.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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mutex_lock(&info->bl_mutex);
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level = pmac_backlight_curve_lookup(info,
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(req.reply[0] >> 4) *
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pmu_backlight_data.max_brightness / 15);
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mutex_unlock(&info->bl_mutex);
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}
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up(&bd->sem);
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bd->props->brightness = level;
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bd->props->power = FB_BLANK_UNBLANK;
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bd->props->update_status(bd);
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down(&bd->sem);
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mutex_lock(&pmac_backlight_mutex);
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if (!pmac_backlight)
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pmac_backlight = bd;
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mutex_unlock(&pmac_backlight_mutex);
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printk("pmubl: Backlight initialized (%s)\n", name);
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return;
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error:
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return;
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}
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