1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Sanyo LV5207LP LED Driver
*
* Copyright (C) 2013 Ideas on board SPRL
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/lv5207lp.h>
#include <linux/slab.h>
#define LV5207LP_CTRL1 0x00
#define LV5207LP_CPSW (1 << 7)
#define LV5207LP_SCTEN (1 << 6)
#define LV5207LP_C10 (1 << 5)
#define LV5207LP_CKSW (1 << 4)
#define LV5207LP_RSW (1 << 3)
#define LV5207LP_GSW (1 << 2)
#define LV5207LP_BSW (1 << 1)
#define LV5207LP_CTRL2 0x01
#define LV5207LP_MSW (1 << 7)
#define LV5207LP_MLED4 (1 << 6)
#define LV5207LP_RED 0x02
#define LV5207LP_GREEN 0x03
#define LV5207LP_BLUE 0x04
#define LV5207LP_MAX_BRIGHTNESS 32
struct lv5207lp {
struct i2c_client *client;
struct backlight_device *backlight;
struct lv5207lp_platform_data *pdata;
};
static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)
{
return i2c_smbus_write_byte_data(lv->client, reg, data);
}
static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
{
struct lv5207lp *lv = bl_get_data(backlight);
int brightness = backlight_get_brightness(backlight);
if (brightness) {
lv5207lp_write(lv, LV5207LP_CTRL1,
LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW);
lv5207lp_write(lv, LV5207LP_CTRL2,
LV5207LP_MSW | LV5207LP_MLED4 |
(brightness - 1));
} else {
lv5207lp_write(lv, LV5207LP_CTRL1, 0);
lv5207lp_write(lv, LV5207LP_CTRL2, 0);
}
return 0;
}
static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
struct fb_info *info)
{
struct lv5207lp *lv = bl_get_data(backlight);
return !lv->pdata->dev || lv->pdata->dev == info->device;
}
static const struct backlight_ops lv5207lp_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = lv5207lp_backlight_update_status,
.check_fb = lv5207lp_backlight_check_fb,
};
static int lv5207lp_probe(struct i2c_client *client)
{
struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev);
struct backlight_device *backlight;
struct backlight_properties props;
struct lv5207lp *lv;
if (pdata == NULL) {
dev_err(&client->dev, "No platform data supplied\n");
return -EINVAL;
}
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_warn(&client->dev,
"I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
return -EIO;
}
lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);
if (!lv)
return -ENOMEM;
lv->client = client;
lv->pdata = pdata;
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = min_t(unsigned int, pdata->max_value,
LV5207LP_MAX_BRIGHTNESS);
props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
props.max_brightness);
backlight = devm_backlight_device_register(&client->dev,
dev_name(&client->dev), &lv->client->dev,
lv, &lv5207lp_backlight_ops, &props);
if (IS_ERR(backlight)) {
dev_err(&client->dev, "failed to register backlight\n");
return PTR_ERR(backlight);
}
backlight_update_status(backlight);
i2c_set_clientdata(client, backlight);
return 0;
}
static void lv5207lp_remove(struct i2c_client *client)
{
struct backlight_device *backlight = i2c_get_clientdata(client);
backlight->props.brightness = 0;
backlight_update_status(backlight);
}
static const struct i2c_device_id lv5207lp_ids[] = {
{ "lv5207lp", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);
static struct i2c_driver lv5207lp_driver = {
.driver = {
.name = "lv5207lp",
},
.probe = lv5207lp_probe,
.remove = lv5207lp_remove,
.id_table = lv5207lp_ids,
};
module_i2c_driver(lv5207lp_driver);
MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_LICENSE("GPL");
|
