1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /***************************************************************************
3*4882a593Smuzhiyun * Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> *
4*4882a593Smuzhiyun * *
5*4882a593Smuzhiyun * Based on Logitech G13 driver (v0.4) *
6*4882a593Smuzhiyun * Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> *
7*4882a593Smuzhiyun * *
8*4882a593Smuzhiyun ***************************************************************************/
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/hid.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/fb.h>
13*4882a593Smuzhiyun #include <linux/lcd.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include "hid-picolcd.h"
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /*
18*4882a593Smuzhiyun * lcd class device
19*4882a593Smuzhiyun */
picolcd_get_contrast(struct lcd_device * ldev)20*4882a593Smuzhiyun static int picolcd_get_contrast(struct lcd_device *ldev)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun struct picolcd_data *data = lcd_get_data(ldev);
23*4882a593Smuzhiyun return data->lcd_contrast;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
picolcd_set_contrast(struct lcd_device * ldev,int contrast)26*4882a593Smuzhiyun static int picolcd_set_contrast(struct lcd_device *ldev, int contrast)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct picolcd_data *data = lcd_get_data(ldev);
29*4882a593Smuzhiyun struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev);
30*4882a593Smuzhiyun unsigned long flags;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun if (!report || report->maxfield != 1 || report->field[0]->report_count != 1)
33*4882a593Smuzhiyun return -ENODEV;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun data->lcd_contrast = contrast & 0x0ff;
36*4882a593Smuzhiyun spin_lock_irqsave(&data->lock, flags);
37*4882a593Smuzhiyun hid_set_field(report->field[0], 0, data->lcd_contrast);
38*4882a593Smuzhiyun if (!(data->status & PICOLCD_FAILED))
39*4882a593Smuzhiyun hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
40*4882a593Smuzhiyun spin_unlock_irqrestore(&data->lock, flags);
41*4882a593Smuzhiyun return 0;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
picolcd_check_lcd_fb(struct lcd_device * ldev,struct fb_info * fb)44*4882a593Smuzhiyun static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev));
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun static struct lcd_ops picolcd_lcdops = {
50*4882a593Smuzhiyun .get_contrast = picolcd_get_contrast,
51*4882a593Smuzhiyun .set_contrast = picolcd_set_contrast,
52*4882a593Smuzhiyun .check_fb = picolcd_check_lcd_fb,
53*4882a593Smuzhiyun };
54*4882a593Smuzhiyun
picolcd_init_lcd(struct picolcd_data * data,struct hid_report * report)55*4882a593Smuzhiyun int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct device *dev = &data->hdev->dev;
58*4882a593Smuzhiyun struct lcd_device *ldev;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (!report)
61*4882a593Smuzhiyun return -ENODEV;
62*4882a593Smuzhiyun if (report->maxfield != 1 || report->field[0]->report_count != 1 ||
63*4882a593Smuzhiyun report->field[0]->report_size != 8) {
64*4882a593Smuzhiyun dev_err(dev, "unsupported CONTRAST report");
65*4882a593Smuzhiyun return -EINVAL;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops);
69*4882a593Smuzhiyun if (IS_ERR(ldev)) {
70*4882a593Smuzhiyun dev_err(dev, "failed to register LCD\n");
71*4882a593Smuzhiyun return PTR_ERR(ldev);
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun ldev->props.max_contrast = 0x0ff;
74*4882a593Smuzhiyun data->lcd_contrast = 0xe5;
75*4882a593Smuzhiyun data->lcd = ldev;
76*4882a593Smuzhiyun picolcd_set_contrast(ldev, 0xe5);
77*4882a593Smuzhiyun return 0;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
picolcd_exit_lcd(struct picolcd_data * data)80*4882a593Smuzhiyun void picolcd_exit_lcd(struct picolcd_data *data)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun struct lcd_device *ldev = data->lcd;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun data->lcd = NULL;
85*4882a593Smuzhiyun lcd_device_unregister(ldev);
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
picolcd_resume_lcd(struct picolcd_data * data)88*4882a593Smuzhiyun int picolcd_resume_lcd(struct picolcd_data *data)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun if (!data->lcd)
91*4882a593Smuzhiyun return 0;
92*4882a593Smuzhiyun return picolcd_set_contrast(data->lcd, data->lcd_contrast);
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
95