Root/
1 | /*************************************************************************** |
2 | * Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> * |
3 | * * |
4 | * Based on Logitech G13 driver (v0.4) * |
5 | * Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> * |
6 | * * |
7 | * This program is free software: you can redistribute it and/or modify * |
8 | * it under the terms of the GNU General Public License as published by * |
9 | * the Free Software Foundation, version 2 of the License. * |
10 | * * |
11 | * This driver is distributed in the hope that it will be useful, but * |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of * |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * |
14 | * General Public License for more details. * |
15 | * * |
16 | * You should have received a copy of the GNU General Public License * |
17 | * along with this software. If not see <http://www.gnu.org/licenses/>. * |
18 | ***************************************************************************/ |
19 | |
20 | #include <linux/hid.h> |
21 | #include "usbhid/usbhid.h" |
22 | #include <linux/usb.h> |
23 | |
24 | #include <linux/fb.h> |
25 | #include <linux/backlight.h> |
26 | |
27 | #include "hid-picolcd.h" |
28 | |
29 | static int picolcd_get_brightness(struct backlight_device *bdev) |
30 | { |
31 | struct picolcd_data *data = bl_get_data(bdev); |
32 | return data->lcd_brightness; |
33 | } |
34 | |
35 | static int picolcd_set_brightness(struct backlight_device *bdev) |
36 | { |
37 | struct picolcd_data *data = bl_get_data(bdev); |
38 | struct hid_report *report = picolcd_out_report(REPORT_BRIGHTNESS, data->hdev); |
39 | unsigned long flags; |
40 | |
41 | if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) |
42 | return -ENODEV; |
43 | |
44 | data->lcd_brightness = bdev->props.brightness & 0x0ff; |
45 | data->lcd_power = bdev->props.power; |
46 | spin_lock_irqsave(&data->lock, flags); |
47 | hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0); |
48 | if (!(data->status & PICOLCD_FAILED)) |
49 | usbhid_submit_report(data->hdev, report, USB_DIR_OUT); |
50 | spin_unlock_irqrestore(&data->lock, flags); |
51 | return 0; |
52 | } |
53 | |
54 | static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb) |
55 | { |
56 | return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev)); |
57 | } |
58 | |
59 | static const struct backlight_ops picolcd_blops = { |
60 | .update_status = picolcd_set_brightness, |
61 | .get_brightness = picolcd_get_brightness, |
62 | .check_fb = picolcd_check_bl_fb, |
63 | }; |
64 | |
65 | int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report) |
66 | { |
67 | struct device *dev = &data->hdev->dev; |
68 | struct backlight_device *bdev; |
69 | struct backlight_properties props; |
70 | if (!report) |
71 | return -ENODEV; |
72 | if (report->maxfield != 1 || report->field[0]->report_count != 1 || |
73 | report->field[0]->report_size != 8) { |
74 | dev_err(dev, "unsupported BRIGHTNESS report"); |
75 | return -EINVAL; |
76 | } |
77 | |
78 | memset(&props, 0, sizeof(props)); |
79 | props.type = BACKLIGHT_RAW; |
80 | props.max_brightness = 0xff; |
81 | bdev = backlight_device_register(dev_name(dev), dev, data, |
82 | &picolcd_blops, &props); |
83 | if (IS_ERR(bdev)) { |
84 | dev_err(dev, "failed to register backlight\n"); |
85 | return PTR_ERR(bdev); |
86 | } |
87 | bdev->props.brightness = 0xff; |
88 | data->lcd_brightness = 0xff; |
89 | data->backlight = bdev; |
90 | picolcd_set_brightness(bdev); |
91 | return 0; |
92 | } |
93 | |
94 | void picolcd_exit_backlight(struct picolcd_data *data) |
95 | { |
96 | struct backlight_device *bdev = data->backlight; |
97 | |
98 | data->backlight = NULL; |
99 | if (bdev) |
100 | backlight_device_unregister(bdev); |
101 | } |
102 | |
103 | int picolcd_resume_backlight(struct picolcd_data *data) |
104 | { |
105 | if (!data->backlight) |
106 | return 0; |
107 | return picolcd_set_brightness(data->backlight); |
108 | } |
109 | |
110 | #ifdef CONFIG_PM |
111 | void picolcd_suspend_backlight(struct picolcd_data *data) |
112 | { |
113 | int bl_power = data->lcd_power; |
114 | if (!data->backlight) |
115 | return; |
116 | |
117 | data->backlight->props.power = FB_BLANK_POWERDOWN; |
118 | picolcd_set_brightness(data->backlight); |
119 | data->lcd_power = data->backlight->props.power = bl_power; |
120 | } |
121 | #endif /* CONFIG_PM */ |
122 | |
123 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
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