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/lcd.h> |
26 | |
27 | #include "hid-picolcd.h" |
28 | |
29 | /* |
30 | * lcd class device |
31 | */ |
32 | static int picolcd_get_contrast(struct lcd_device *ldev) |
33 | { |
34 | struct picolcd_data *data = lcd_get_data(ldev); |
35 | return data->lcd_contrast; |
36 | } |
37 | |
38 | static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) |
39 | { |
40 | struct picolcd_data *data = lcd_get_data(ldev); |
41 | struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev); |
42 | unsigned long flags; |
43 | |
44 | if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) |
45 | return -ENODEV; |
46 | |
47 | data->lcd_contrast = contrast & 0x0ff; |
48 | spin_lock_irqsave(&data->lock, flags); |
49 | hid_set_field(report->field[0], 0, data->lcd_contrast); |
50 | if (!(data->status & PICOLCD_FAILED)) |
51 | usbhid_submit_report(data->hdev, report, USB_DIR_OUT); |
52 | spin_unlock_irqrestore(&data->lock, flags); |
53 | return 0; |
54 | } |
55 | |
56 | static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb) |
57 | { |
58 | return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev)); |
59 | } |
60 | |
61 | static struct lcd_ops picolcd_lcdops = { |
62 | .get_contrast = picolcd_get_contrast, |
63 | .set_contrast = picolcd_set_contrast, |
64 | .check_fb = picolcd_check_lcd_fb, |
65 | }; |
66 | |
67 | int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report) |
68 | { |
69 | struct device *dev = &data->hdev->dev; |
70 | struct lcd_device *ldev; |
71 | |
72 | if (!report) |
73 | return -ENODEV; |
74 | if (report->maxfield != 1 || report->field[0]->report_count != 1 || |
75 | report->field[0]->report_size != 8) { |
76 | dev_err(dev, "unsupported CONTRAST report"); |
77 | return -EINVAL; |
78 | } |
79 | |
80 | ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops); |
81 | if (IS_ERR(ldev)) { |
82 | dev_err(dev, "failed to register LCD\n"); |
83 | return PTR_ERR(ldev); |
84 | } |
85 | ldev->props.max_contrast = 0x0ff; |
86 | data->lcd_contrast = 0xe5; |
87 | data->lcd = ldev; |
88 | picolcd_set_contrast(ldev, 0xe5); |
89 | return 0; |
90 | } |
91 | |
92 | void picolcd_exit_lcd(struct picolcd_data *data) |
93 | { |
94 | struct lcd_device *ldev = data->lcd; |
95 | |
96 | data->lcd = NULL; |
97 | if (ldev) |
98 | lcd_device_unregister(ldev); |
99 | } |
100 | |
101 | int picolcd_resume_lcd(struct picolcd_data *data) |
102 | { |
103 | if (!data->lcd) |
104 | return 0; |
105 | return picolcd_set_contrast(data->lcd, data->lcd_contrast); |
106 | } |
107 | |
108 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9