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