1/***************************************************************************
2 *   Copyright (C) 2010-2012 by Bruno Pr��mont <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
22#include <linux/fb.h>
23#include <linux/lcd.h>
24
25#include "hid-picolcd.h"
26
27/*
28 * lcd class device
29 */
30static int picolcd_get_contrast(struct lcd_device *ldev)
31{
32	struct picolcd_data *data = lcd_get_data(ldev);
33	return data->lcd_contrast;
34}
35
36static int picolcd_set_contrast(struct lcd_device *ldev, int contrast)
37{
38	struct picolcd_data *data = lcd_get_data(ldev);
39	struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev);
40	unsigned long flags;
41
42	if (!report || report->maxfield != 1 || report->field[0]->report_count != 1)
43		return -ENODEV;
44
45	data->lcd_contrast = contrast & 0x0ff;
46	spin_lock_irqsave(&data->lock, flags);
47	hid_set_field(report->field[0], 0, data->lcd_contrast);
48	if (!(data->status & PICOLCD_FAILED))
49		hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
50	spin_unlock_irqrestore(&data->lock, flags);
51	return 0;
52}
53
54static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb)
55{
56	return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev));
57}
58
59static struct lcd_ops picolcd_lcdops = {
60	.get_contrast   = picolcd_get_contrast,
61	.set_contrast   = picolcd_set_contrast,
62	.check_fb       = picolcd_check_lcd_fb,
63};
64
65int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report)
66{
67	struct device *dev = &data->hdev->dev;
68	struct lcd_device *ldev;
69
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 CONTRAST report");
75		return -EINVAL;
76	}
77
78	ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops);
79	if (IS_ERR(ldev)) {
80		dev_err(dev, "failed to register LCD\n");
81		return PTR_ERR(ldev);
82	}
83	ldev->props.max_contrast = 0x0ff;
84	data->lcd_contrast = 0xe5;
85	data->lcd = ldev;
86	picolcd_set_contrast(ldev, 0xe5);
87	return 0;
88}
89
90void picolcd_exit_lcd(struct picolcd_data *data)
91{
92	struct lcd_device *ldev = data->lcd;
93
94	data->lcd = NULL;
95	lcd_device_unregister(ldev);
96}
97
98int picolcd_resume_lcd(struct picolcd_data *data)
99{
100	if (!data->lcd)
101		return 0;
102	return picolcd_set_contrast(data->lcd, data->lcd_contrast);
103}
104
105