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109 lines
3.3 KiB
109 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/*************************************************************************** |
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* Copyright (C) 2010-2012 by Bruno Prémont <[email protected]> * |
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* * |
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* Based on Logitech G13 driver (v0.4) * |
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* Copyright (C) 2009 by Rick L. Vinyard, Jr. <[email protected]> * |
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* * |
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***************************************************************************/ |
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#include <linux/hid.h> |
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#include <linux/fb.h> |
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#include <linux/backlight.h> |
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#include "hid-picolcd.h" |
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static int picolcd_get_brightness(struct backlight_device *bdev) |
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{ |
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struct picolcd_data *data = bl_get_data(bdev); |
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return data->lcd_brightness; |
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} |
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static int picolcd_set_brightness(struct backlight_device *bdev) |
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{ |
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struct picolcd_data *data = bl_get_data(bdev); |
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struct hid_report *report = picolcd_out_report(REPORT_BRIGHTNESS, data->hdev); |
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unsigned long flags; |
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if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) |
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return -ENODEV; |
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data->lcd_brightness = bdev->props.brightness & 0x0ff; |
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data->lcd_power = bdev->props.power; |
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spin_lock_irqsave(&data->lock, flags); |
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hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0); |
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if (!(data->status & PICOLCD_FAILED)) |
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hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); |
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spin_unlock_irqrestore(&data->lock, flags); |
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return 0; |
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} |
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static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb) |
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{ |
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return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev)); |
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} |
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static const struct backlight_ops picolcd_blops = { |
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.update_status = picolcd_set_brightness, |
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.get_brightness = picolcd_get_brightness, |
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.check_fb = picolcd_check_bl_fb, |
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}; |
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int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report) |
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{ |
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struct device *dev = &data->hdev->dev; |
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struct backlight_device *bdev; |
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struct backlight_properties props; |
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if (!report) |
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return -ENODEV; |
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if (report->maxfield != 1 || report->field[0]->report_count != 1 || |
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report->field[0]->report_size != 8) { |
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dev_err(dev, "unsupported BRIGHTNESS report"); |
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return -EINVAL; |
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} |
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memset(&props, 0, sizeof(props)); |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = 0xff; |
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bdev = backlight_device_register(dev_name(dev), dev, data, |
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&picolcd_blops, &props); |
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if (IS_ERR(bdev)) { |
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dev_err(dev, "failed to register backlight\n"); |
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return PTR_ERR(bdev); |
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} |
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bdev->props.brightness = 0xff; |
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data->lcd_brightness = 0xff; |
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data->backlight = bdev; |
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picolcd_set_brightness(bdev); |
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return 0; |
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} |
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void picolcd_exit_backlight(struct picolcd_data *data) |
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{ |
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struct backlight_device *bdev = data->backlight; |
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data->backlight = NULL; |
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backlight_device_unregister(bdev); |
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} |
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int picolcd_resume_backlight(struct picolcd_data *data) |
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{ |
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if (!data->backlight) |
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return 0; |
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return picolcd_set_brightness(data->backlight); |
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} |
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#ifdef CONFIG_PM |
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void picolcd_suspend_backlight(struct picolcd_data *data) |
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{ |
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int bl_power = data->lcd_power; |
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if (!data->backlight) |
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return; |
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data->backlight->props.power = FB_BLANK_POWERDOWN; |
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picolcd_set_brightness(data->backlight); |
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data->lcd_power = data->backlight->props.power = bl_power; |
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} |
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#endif /* CONFIG_PM */ |
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