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24c9d96d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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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 | * * | |
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8 | ***************************************************************************/ |
9 | ||
10 | #include <linux/hid.h> | |
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11 | |
12 | #include <linux/fb.h> | |
13 | #include <linux/backlight.h> | |
14 | ||
15 | #include "hid-picolcd.h" | |
16 | ||
17 | static 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 | ||
23 | static 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); | |
a93ab849 | 36 | if (!(data->status & PICOLCD_FAILED)) |
d8814272 | 37 | hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); |
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38 | spin_unlock_irqrestore(&data->lock, flags); |
39 | return 0; | |
40 | } | |
41 | ||
42 | static 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 | ||
47 | static 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 | ||
53 | int 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 | ||
82 | void picolcd_exit_backlight(struct picolcd_data *data) | |
83 | { | |
84 | struct backlight_device *bdev = data->backlight; | |
85 | ||
86 | data->backlight = NULL; | |
4b8a8262 | 87 | backlight_device_unregister(bdev); |
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88 | } |
89 | ||
90 | int 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 | |
98 | void 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 |