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Bruno Prémontfabdbf22012-07-30 21:38:28 +02001/***************************************************************************
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
29static 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
35static 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);
Bruno Prémonta93ab842012-07-30 21:38:57 +020048 if (!(data->status & PICOLCD_FAILED))
49 usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
Bruno Prémontfabdbf22012-07-30 21:38:28 +020050 spin_unlock_irqrestore(&data->lock, flags);
51 return 0;
52}
53
54static 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
59static 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
65int 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
94void 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
103int 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
111void 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