blob: 2d0ddc5ac65fe1b6d47f236c97a19a32585aee04 [file] [log] [blame]
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/lcd.h>
26
27#include "hid-picolcd.h"
28
29/*
30 * lcd class device
31 */
32static 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
38static 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);
Bruno Prémonta93ab842012-07-30 21:38:57 +020050 if (!(data->status & PICOLCD_FAILED))
51 usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
Bruno Prémontfabdbf22012-07-30 21:38:28 +020052 spin_unlock_irqrestore(&data->lock, flags);
53 return 0;
54}
55
56static 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
61static 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
67int 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
92void 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
101int 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