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1// SPDX-License-Identifier: GPL-2.0-only
2/***************************************************************************
3 * Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> *
4 * *
5 * Based on Logitech G13 driver (v0.4) *
6 * Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> *
7 * *
8 ***************************************************************************/
9
10#include <linux/hid.h>
11
12#include <linux/fb.h>
13#include <linux/backlight.h>
14
15#include "hid-picolcd.h"
16
17static int picolcd_get_brightness(struct backlight_device *bdev)
18{
19 struct picolcd_data *data = bl_get_data(bdev);
20 return data->lcd_brightness;
21}
22
23static int picolcd_set_brightness(struct backlight_device *bdev)
24{
25 struct picolcd_data *data = bl_get_data(bdev);
26 struct hid_report *report = picolcd_out_report(REPORT_BRIGHTNESS, data->hdev);
27 unsigned long flags;
28
29 if (!report || report->maxfield != 1 || report->field[0]->report_count != 1)
30 return -ENODEV;
31
32 data->lcd_brightness = bdev->props.brightness & 0x0ff;
33 data->lcd_power = bdev->props.power;
34 spin_lock_irqsave(&data->lock, flags);
35 hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0);
36 if (!(data->status & PICOLCD_FAILED))
37 hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
38 spin_unlock_irqrestore(&data->lock, flags);
39 return 0;
40}
41
42static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb)
43{
44 return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev));
45}
46
47static const struct backlight_ops picolcd_blops = {
48 .update_status = picolcd_set_brightness,
49 .get_brightness = picolcd_get_brightness,
50 .check_fb = picolcd_check_bl_fb,
51};
52
53int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report)
54{
55 struct device *dev = &data->hdev->dev;
56 struct backlight_device *bdev;
57 struct backlight_properties props;
58 if (!report)
59 return -ENODEV;
60 if (report->maxfield != 1 || report->field[0]->report_count != 1 ||
61 report->field[0]->report_size != 8) {
62 dev_err(dev, "unsupported BRIGHTNESS report");
63 return -EINVAL;
64 }
65
66 memset(&props, 0, sizeof(props));
67 props.type = BACKLIGHT_RAW;
68 props.max_brightness = 0xff;
69 bdev = backlight_device_register(dev_name(dev), dev, data,
70 &picolcd_blops, &props);
71 if (IS_ERR(bdev)) {
72 dev_err(dev, "failed to register backlight\n");
73 return PTR_ERR(bdev);
74 }
75 bdev->props.brightness = 0xff;
76 data->lcd_brightness = 0xff;
77 data->backlight = bdev;
78 picolcd_set_brightness(bdev);
79 return 0;
80}
81
82void picolcd_exit_backlight(struct picolcd_data *data)
83{
84 struct backlight_device *bdev = data->backlight;
85
86 data->backlight = NULL;
87 backlight_device_unregister(bdev);
88}
89
90int picolcd_resume_backlight(struct picolcd_data *data)
91{
92 if (!data->backlight)
93 return 0;
94 return picolcd_set_brightness(data->backlight);
95}
96
97#ifdef CONFIG_PM
98void picolcd_suspend_backlight(struct picolcd_data *data)
99{
100 int bl_power = data->lcd_power;
101 if (!data->backlight)
102 return;
103
104 data->backlight->props.power = FB_BLANK_POWERDOWN;
105 picolcd_set_brightness(data->backlight);
106 data->lcd_power = data->backlight->props.power = bl_power;
107}
108#endif /* CONFIG_PM */
109
1// SPDX-License-Identifier: GPL-2.0-only
2/***************************************************************************
3 * Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> *
4 * *
5 * Based on Logitech G13 driver (v0.4) *
6 * Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> *
7 * *
8 ***************************************************************************/
9
10#include <linux/hid.h>
11
12#include <linux/fb.h>
13#include <linux/backlight.h>
14
15#include "hid-picolcd.h"
16
17static int picolcd_get_brightness(struct backlight_device *bdev)
18{
19 struct picolcd_data *data = bl_get_data(bdev);
20 return data->lcd_brightness;
21}
22
23static int picolcd_set_brightness(struct backlight_device *bdev)
24{
25 struct picolcd_data *data = bl_get_data(bdev);
26 struct hid_report *report = picolcd_out_report(REPORT_BRIGHTNESS, data->hdev);
27 unsigned long flags;
28
29 if (!report || report->maxfield != 1 || report->field[0]->report_count != 1)
30 return -ENODEV;
31
32 data->lcd_brightness = bdev->props.brightness & 0x0ff;
33 data->lcd_power = bdev->props.power;
34 spin_lock_irqsave(&data->lock, flags);
35 hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0);
36 if (!(data->status & PICOLCD_FAILED))
37 hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
38 spin_unlock_irqrestore(&data->lock, flags);
39 return 0;
40}
41
42static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb)
43{
44 return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev));
45}
46
47static const struct backlight_ops picolcd_blops = {
48 .update_status = picolcd_set_brightness,
49 .get_brightness = picolcd_get_brightness,
50 .check_fb = picolcd_check_bl_fb,
51};
52
53int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report)
54{
55 struct device *dev = &data->hdev->dev;
56 struct backlight_device *bdev;
57 struct backlight_properties props;
58 if (!report)
59 return -ENODEV;
60 if (report->maxfield != 1 || report->field[0]->report_count != 1 ||
61 report->field[0]->report_size != 8) {
62 dev_err(dev, "unsupported BRIGHTNESS report");
63 return -EINVAL;
64 }
65
66 memset(&props, 0, sizeof(props));
67 props.type = BACKLIGHT_RAW;
68 props.max_brightness = 0xff;
69 bdev = backlight_device_register(dev_name(dev), dev, data,
70 &picolcd_blops, &props);
71 if (IS_ERR(bdev)) {
72 dev_err(dev, "failed to register backlight\n");
73 return PTR_ERR(bdev);
74 }
75 bdev->props.brightness = 0xff;
76 data->lcd_brightness = 0xff;
77 data->backlight = bdev;
78 picolcd_set_brightness(bdev);
79 return 0;
80}
81
82void picolcd_exit_backlight(struct picolcd_data *data)
83{
84 struct backlight_device *bdev = data->backlight;
85
86 data->backlight = NULL;
87 backlight_device_unregister(bdev);
88}
89
90int picolcd_resume_backlight(struct picolcd_data *data)
91{
92 if (!data->backlight)
93 return 0;
94 return picolcd_set_brightness(data->backlight);
95}
96
97#ifdef CONFIG_PM
98void picolcd_suspend_backlight(struct picolcd_data *data)
99{
100 int bl_power = data->lcd_power;
101 if (!data->backlight)
102 return;
103
104 data->backlight->props.power = FB_BLANK_POWERDOWN;
105 picolcd_set_brightness(data->backlight);
106 data->lcd_power = data->backlight->props.power = bl_power;
107}
108#endif /* CONFIG_PM */
109