// SPDX-License-Identifier: GPL-2.0-only
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/***************************************************************************
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* Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> *
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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. <rvinyard@cs.nmsu.edu> *
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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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