1 // SPDX-License-Identifier: GPL-2.0-only
3 * Sanyo LV5207LP LED Driver
5 * Copyright (C) 2013 Ideas on board SPRL
7 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
10 #include <linux/backlight.h>
11 #include <linux/err.h>
13 #include <linux/i2c.h>
14 #include <linux/module.h>
15 #include <linux/platform_data/lv5207lp.h>
16 #include <linux/slab.h>
18 #define LV5207LP_CTRL1 0x00
19 #define LV5207LP_CPSW (1 << 7)
20 #define LV5207LP_SCTEN (1 << 6)
21 #define LV5207LP_C10 (1 << 5)
22 #define LV5207LP_CKSW (1 << 4)
23 #define LV5207LP_RSW (1 << 3)
24 #define LV5207LP_GSW (1 << 2)
25 #define LV5207LP_BSW (1 << 1)
26 #define LV5207LP_CTRL2 0x01
27 #define LV5207LP_MSW (1 << 7)
28 #define LV5207LP_MLED4 (1 << 6)
29 #define LV5207LP_RED 0x02
30 #define LV5207LP_GREEN 0x03
31 #define LV5207LP_BLUE 0x04
33 #define LV5207LP_MAX_BRIGHTNESS 32
36 struct i2c_client
*client
;
37 struct backlight_device
*backlight
;
38 struct lv5207lp_platform_data
*pdata
;
41 static int lv5207lp_write(struct lv5207lp
*lv
, u8 reg
, u8 data
)
43 return i2c_smbus_write_byte_data(lv
->client
, reg
, data
);
46 static int lv5207lp_backlight_update_status(struct backlight_device
*backlight
)
48 struct lv5207lp
*lv
= bl_get_data(backlight
);
49 int brightness
= backlight
->props
.brightness
;
51 if (backlight
->props
.power
!= FB_BLANK_UNBLANK
||
52 backlight
->props
.fb_blank
!= FB_BLANK_UNBLANK
||
53 backlight
->props
.state
& (BL_CORE_SUSPENDED
| BL_CORE_FBBLANK
))
57 lv5207lp_write(lv
, LV5207LP_CTRL1
,
58 LV5207LP_CPSW
| LV5207LP_C10
| LV5207LP_CKSW
);
59 lv5207lp_write(lv
, LV5207LP_CTRL2
,
60 LV5207LP_MSW
| LV5207LP_MLED4
|
63 lv5207lp_write(lv
, LV5207LP_CTRL1
, 0);
64 lv5207lp_write(lv
, LV5207LP_CTRL2
, 0);
70 static int lv5207lp_backlight_check_fb(struct backlight_device
*backlight
,
73 struct lv5207lp
*lv
= bl_get_data(backlight
);
75 return lv
->pdata
->fbdev
== NULL
|| lv
->pdata
->fbdev
== info
->dev
;
78 static const struct backlight_ops lv5207lp_backlight_ops
= {
79 .options
= BL_CORE_SUSPENDRESUME
,
80 .update_status
= lv5207lp_backlight_update_status
,
81 .check_fb
= lv5207lp_backlight_check_fb
,
84 static int lv5207lp_probe(struct i2c_client
*client
,
85 const struct i2c_device_id
*id
)
87 struct lv5207lp_platform_data
*pdata
= dev_get_platdata(&client
->dev
);
88 struct backlight_device
*backlight
;
89 struct backlight_properties props
;
93 dev_err(&client
->dev
, "No platform data supplied\n");
97 if (!i2c_check_functionality(client
->adapter
,
98 I2C_FUNC_SMBUS_BYTE_DATA
)) {
99 dev_warn(&client
->dev
,
100 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
104 lv
= devm_kzalloc(&client
->dev
, sizeof(*lv
), GFP_KERNEL
);
111 memset(&props
, 0, sizeof(props
));
112 props
.type
= BACKLIGHT_RAW
;
113 props
.max_brightness
= min_t(unsigned int, pdata
->max_value
,
114 LV5207LP_MAX_BRIGHTNESS
);
115 props
.brightness
= clamp_t(unsigned int, pdata
->def_value
, 0,
116 props
.max_brightness
);
118 backlight
= devm_backlight_device_register(&client
->dev
,
119 dev_name(&client
->dev
), &lv
->client
->dev
,
120 lv
, &lv5207lp_backlight_ops
, &props
);
121 if (IS_ERR(backlight
)) {
122 dev_err(&client
->dev
, "failed to register backlight\n");
123 return PTR_ERR(backlight
);
126 backlight_update_status(backlight
);
127 i2c_set_clientdata(client
, backlight
);
132 static int lv5207lp_remove(struct i2c_client
*client
)
134 struct backlight_device
*backlight
= i2c_get_clientdata(client
);
136 backlight
->props
.brightness
= 0;
137 backlight_update_status(backlight
);
142 static const struct i2c_device_id lv5207lp_ids
[] = {
146 MODULE_DEVICE_TABLE(i2c
, lv5207lp_ids
);
148 static struct i2c_driver lv5207lp_driver
= {
152 .probe
= lv5207lp_probe
,
153 .remove
= lv5207lp_remove
,
154 .id_table
= lv5207lp_ids
,
157 module_i2c_driver(lv5207lp_driver
);
159 MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
160 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
161 MODULE_LICENSE("GPL");