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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/lcd.h> | |
14 | ||
15 | #include "hid-picolcd.h" | |
16 | ||
17 | /* | |
18 | * lcd class device | |
19 | */ | |
20 | static int picolcd_get_contrast(struct lcd_device *ldev) | |
21 | { | |
22 | struct picolcd_data *data = lcd_get_data(ldev); | |
23 | return data->lcd_contrast; | |
24 | } | |
25 | ||
26 | static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) | |
27 | { | |
28 | struct picolcd_data *data = lcd_get_data(ldev); | |
29 | struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev); | |
30 | unsigned long flags; | |
31 | ||
32 | if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) | |
33 | return -ENODEV; | |
34 | ||
35 | data->lcd_contrast = contrast & 0x0ff; | |
36 | spin_lock_irqsave(&data->lock, flags); | |
37 | hid_set_field(report->field[0], 0, data->lcd_contrast); | |
a93ab849 | 38 | if (!(data->status & PICOLCD_FAILED)) |
d8814272 | 39 | hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); |
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40 | spin_unlock_irqrestore(&data->lock, flags); |
41 | return 0; | |
42 | } | |
43 | ||
44 | static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb) | |
45 | { | |
46 | return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev)); | |
47 | } | |
48 | ||
49 | static struct lcd_ops picolcd_lcdops = { | |
50 | .get_contrast = picolcd_get_contrast, | |
51 | .set_contrast = picolcd_set_contrast, | |
52 | .check_fb = picolcd_check_lcd_fb, | |
53 | }; | |
54 | ||
55 | int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report) | |
56 | { | |
57 | struct device *dev = &data->hdev->dev; | |
58 | struct lcd_device *ldev; | |
59 | ||
60 | if (!report) | |
61 | return -ENODEV; | |
62 | if (report->maxfield != 1 || report->field[0]->report_count != 1 || | |
63 | report->field[0]->report_size != 8) { | |
64 | dev_err(dev, "unsupported CONTRAST report"); | |
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops); | |
69 | if (IS_ERR(ldev)) { | |
70 | dev_err(dev, "failed to register LCD\n"); | |
71 | return PTR_ERR(ldev); | |
72 | } | |
73 | ldev->props.max_contrast = 0x0ff; | |
74 | data->lcd_contrast = 0xe5; | |
75 | data->lcd = ldev; | |
76 | picolcd_set_contrast(ldev, 0xe5); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | void picolcd_exit_lcd(struct picolcd_data *data) | |
81 | { | |
82 | struct lcd_device *ldev = data->lcd; | |
83 | ||
84 | data->lcd = NULL; | |
4b8a8262 | 85 | lcd_device_unregister(ldev); |
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86 | } |
87 | ||
88 | int picolcd_resume_lcd(struct picolcd_data *data) | |
89 | { | |
90 | if (!data->lcd) | |
91 | return 0; | |
92 | return picolcd_set_contrast(data->lcd, data->lcd_contrast); | |
93 | } | |
94 |