tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ROHM Semiconductor BD6107 LED Driver
4 *
5 * Copyright (C) 2013 Ideas on board SPRL
6 *
7 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
8 */
9
10#include <linux/backlight.h>
11#include <linux/delay.h>
12#include <linux/err.h>
13#include <linux/fb.h>
14#include <linux/gpio.h>
15#include <linux/i2c.h>
16#include <linux/module.h>
17#include <linux/platform_data/bd6107.h>
18#include <linux/slab.h>
19
20#define BD6107_PSCNT1 0x00
21#define BD6107_PSCNT1_PSCNTREG2 (1 << 2)
22#define BD6107_PSCNT1_PSCNTREG1 (1 << 0)
23#define BD6107_REGVSET 0x02
24#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2)
25#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2)
26#define BD6107_LEDCNT1 0x03
27#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1)
28#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0)
29#define BD6107_PORTSEL 0x04
30#define BD6107_PORTSEL_LEDM(n) (1 << (n))
31#define BD6107_RGB1CNT1 0x05
32#define BD6107_RGB1CNT2 0x06
33#define BD6107_RGB1CNT3 0x07
34#define BD6107_RGB1CNT4 0x08
35#define BD6107_RGB1CNT5 0x09
36#define BD6107_RGB1FLM 0x0a
37#define BD6107_RGB2CNT1 0x0b
38#define BD6107_RGB2CNT2 0x0c
39#define BD6107_RGB2CNT3 0x0d
40#define BD6107_RGB2CNT4 0x0e
41#define BD6107_RGB2CNT5 0x0f
42#define BD6107_RGB2FLM 0x10
43#define BD6107_PSCONT3 0x11
44#define BD6107_SMMONCNT 0x12
45#define BD6107_DCDCCNT 0x13
46#define BD6107_IOSEL 0x14
47#define BD6107_OUT1 0x15
48#define BD6107_OUT2 0x16
49#define BD6107_MASK1 0x17
50#define BD6107_MASK2 0x18
51#define BD6107_FACTOR1 0x19
52#define BD6107_FACTOR2 0x1a
53#define BD6107_CLRFACT1 0x1b
54#define BD6107_CLRFACT2 0x1c
55#define BD6107_STATE1 0x1d
56#define BD6107_LSIVER 0x1e
57#define BD6107_GRPSEL 0x1f
58#define BD6107_LEDCNT2 0x20
59#define BD6107_LEDCNT3 0x21
60#define BD6107_MCURRENT 0x22
61#define BD6107_MAINCNT1 0x23
62#define BD6107_MAINCNT2 0x24
63#define BD6107_SLOPECNT 0x25
64#define BD6107_MSLOPE 0x26
65#define BD6107_RGBSLOPE 0x27
66#define BD6107_TEST 0x29
67#define BD6107_SFTRST 0x2a
68#define BD6107_SFTRSTGD 0x2b
69
70struct bd6107 {
71 struct i2c_client *client;
72 struct backlight_device *backlight;
73 struct bd6107_platform_data *pdata;
74};
75
76static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data)
77{
78 return i2c_smbus_write_byte_data(bd->client, reg, data);
79}
80
81static int bd6107_backlight_update_status(struct backlight_device *backlight)
82{
83 struct bd6107 *bd = bl_get_data(backlight);
84 int brightness = backlight->props.brightness;
85
86 if (backlight->props.power != FB_BLANK_UNBLANK ||
87 backlight->props.fb_blank != FB_BLANK_UNBLANK ||
88 backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
89 brightness = 0;
90
91 if (brightness) {
92 bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) |
93 BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0));
94 bd6107_write(bd, BD6107_MAINCNT1, brightness);
95 bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1);
96 } else {
97 gpio_set_value(bd->pdata->reset, 0);
98 msleep(24);
99 gpio_set_value(bd->pdata->reset, 1);
100 }
101
102 return 0;
103}
104
105static int bd6107_backlight_check_fb(struct backlight_device *backlight,
106 struct fb_info *info)
107{
108 struct bd6107 *bd = bl_get_data(backlight);
109
110 return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev;
111}
112
113static const struct backlight_ops bd6107_backlight_ops = {
114 .options = BL_CORE_SUSPENDRESUME,
115 .update_status = bd6107_backlight_update_status,
116 .check_fb = bd6107_backlight_check_fb,
117};
118
119static int bd6107_probe(struct i2c_client *client,
120 const struct i2c_device_id *id)
121{
122 struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev);
123 struct backlight_device *backlight;
124 struct backlight_properties props;
125 struct bd6107 *bd;
126 int ret;
127
128 if (pdata == NULL || !pdata->reset) {
129 dev_err(&client->dev, "No reset GPIO in platform data\n");
130 return -EINVAL;
131 }
132
133 if (!i2c_check_functionality(client->adapter,
134 I2C_FUNC_SMBUS_BYTE_DATA)) {
135 dev_warn(&client->dev,
136 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
137 return -EIO;
138 }
139
140 bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
141 if (!bd)
142 return -ENOMEM;
143
144 bd->client = client;
145 bd->pdata = pdata;
146
147 ret = devm_gpio_request_one(&client->dev, pdata->reset,
148 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset");
149 if (ret < 0) {
150 dev_err(&client->dev, "unable to request reset GPIO\n");
151 return ret;
152 }
153
154 memset(&props, 0, sizeof(props));
155 props.type = BACKLIGHT_RAW;
156 props.max_brightness = 128;
157 props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
158 props.max_brightness);
159
160 backlight = devm_backlight_device_register(&client->dev,
161 dev_name(&client->dev),
162 &bd->client->dev, bd,
163 &bd6107_backlight_ops, &props);
164 if (IS_ERR(backlight)) {
165 dev_err(&client->dev, "failed to register backlight\n");
166 return PTR_ERR(backlight);
167 }
168
169 backlight_update_status(backlight);
170 i2c_set_clientdata(client, backlight);
171
172 return 0;
173}
174
175static int bd6107_remove(struct i2c_client *client)
176{
177 struct backlight_device *backlight = i2c_get_clientdata(client);
178
179 backlight->props.brightness = 0;
180 backlight_update_status(backlight);
181
182 return 0;
183}
184
185static const struct i2c_device_id bd6107_ids[] = {
186 { "bd6107", 0 },
187 { }
188};
189MODULE_DEVICE_TABLE(i2c, bd6107_ids);
190
191static struct i2c_driver bd6107_driver = {
192 .driver = {
193 .name = "bd6107",
194 },
195 .probe = bd6107_probe,
196 .remove = bd6107_remove,
197 .id_table = bd6107_ids,
198};
199
200module_i2c_driver(bd6107_driver);
201
202MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");
203MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
204MODULE_LICENSE("GPL");