]>
Commit | Line | Data |
---|---|---|
67b43e59 LP |
1 | /* |
2 | * ROHM Semiconductor BD6107 LED Driver | |
3 | * | |
4 | * Copyright (C) 2013 Ideas on board SPRL | |
5 | * | |
6 | * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/backlight.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/fb.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/platform_data/bd6107.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | #define BD6107_PSCNT1 0x00 | |
24 | #define BD6107_PSCNT1_PSCNTREG2 (1 << 2) | |
25 | #define BD6107_PSCNT1_PSCNTREG1 (1 << 0) | |
26 | #define BD6107_REGVSET 0x02 | |
27 | #define BD6107_REGVSET_REG1VSET_2_85V (1 << 2) | |
28 | #define BD6107_REGVSET_REG1VSET_2_80V (0 << 2) | |
29 | #define BD6107_LEDCNT1 0x03 | |
30 | #define BD6107_LEDCNT1_LEDONOFF2 (1 << 1) | |
31 | #define BD6107_LEDCNT1_LEDONOFF1 (1 << 0) | |
32 | #define BD6107_PORTSEL 0x04 | |
33 | #define BD6107_PORTSEL_LEDM(n) (1 << (n)) | |
34 | #define BD6107_RGB1CNT1 0x05 | |
35 | #define BD6107_RGB1CNT2 0x06 | |
36 | #define BD6107_RGB1CNT3 0x07 | |
37 | #define BD6107_RGB1CNT4 0x08 | |
38 | #define BD6107_RGB1CNT5 0x09 | |
39 | #define BD6107_RGB1FLM 0x0a | |
40 | #define BD6107_RGB2CNT1 0x0b | |
41 | #define BD6107_RGB2CNT2 0x0c | |
42 | #define BD6107_RGB2CNT3 0x0d | |
43 | #define BD6107_RGB2CNT4 0x0e | |
44 | #define BD6107_RGB2CNT5 0x0f | |
45 | #define BD6107_RGB2FLM 0x10 | |
46 | #define BD6107_PSCONT3 0x11 | |
47 | #define BD6107_SMMONCNT 0x12 | |
48 | #define BD6107_DCDCCNT 0x13 | |
49 | #define BD6107_IOSEL 0x14 | |
50 | #define BD6107_OUT1 0x15 | |
51 | #define BD6107_OUT2 0x16 | |
52 | #define BD6107_MASK1 0x17 | |
53 | #define BD6107_MASK2 0x18 | |
54 | #define BD6107_FACTOR1 0x19 | |
55 | #define BD6107_FACTOR2 0x1a | |
56 | #define BD6107_CLRFACT1 0x1b | |
57 | #define BD6107_CLRFACT2 0x1c | |
58 | #define BD6107_STATE1 0x1d | |
59 | #define BD6107_LSIVER 0x1e | |
60 | #define BD6107_GRPSEL 0x1f | |
61 | #define BD6107_LEDCNT2 0x20 | |
62 | #define BD6107_LEDCNT3 0x21 | |
63 | #define BD6107_MCURRENT 0x22 | |
64 | #define BD6107_MAINCNT1 0x23 | |
65 | #define BD6107_MAINCNT2 0x24 | |
66 | #define BD6107_SLOPECNT 0x25 | |
67 | #define BD6107_MSLOPE 0x26 | |
68 | #define BD6107_RGBSLOPE 0x27 | |
69 | #define BD6107_TEST 0x29 | |
70 | #define BD6107_SFTRST 0x2a | |
71 | #define BD6107_SFTRSTGD 0x2b | |
72 | ||
73 | struct bd6107 { | |
74 | struct i2c_client *client; | |
75 | struct backlight_device *backlight; | |
76 | struct bd6107_platform_data *pdata; | |
77 | }; | |
78 | ||
79 | static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data) | |
80 | { | |
81 | return i2c_smbus_write_byte_data(bd->client, reg, data); | |
82 | } | |
83 | ||
84 | static int bd6107_backlight_update_status(struct backlight_device *backlight) | |
85 | { | |
86 | struct bd6107 *bd = bl_get_data(backlight); | |
87 | int brightness = backlight->props.brightness; | |
88 | ||
89 | if (backlight->props.power != FB_BLANK_UNBLANK || | |
90 | backlight->props.fb_blank != FB_BLANK_UNBLANK || | |
91 | backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) | |
92 | brightness = 0; | |
93 | ||
94 | if (brightness) { | |
95 | bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) | | |
96 | BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0)); | |
97 | bd6107_write(bd, BD6107_MAINCNT1, brightness); | |
98 | bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1); | |
99 | } else { | |
100 | gpio_set_value(bd->pdata->reset, 0); | |
101 | msleep(24); | |
102 | gpio_set_value(bd->pdata->reset, 1); | |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
67b43e59 LP |
108 | static int bd6107_backlight_check_fb(struct backlight_device *backlight, |
109 | struct fb_info *info) | |
110 | { | |
111 | struct bd6107 *bd = bl_get_data(backlight); | |
112 | ||
113 | return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev; | |
114 | } | |
115 | ||
116 | static const struct backlight_ops bd6107_backlight_ops = { | |
117 | .options = BL_CORE_SUSPENDRESUME, | |
118 | .update_status = bd6107_backlight_update_status, | |
67b43e59 LP |
119 | .check_fb = bd6107_backlight_check_fb, |
120 | }; | |
121 | ||
122 | static int bd6107_probe(struct i2c_client *client, | |
123 | const struct i2c_device_id *id) | |
124 | { | |
c512794c | 125 | struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev); |
67b43e59 LP |
126 | struct backlight_device *backlight; |
127 | struct backlight_properties props; | |
128 | struct bd6107 *bd; | |
129 | int ret; | |
130 | ||
131 | if (pdata == NULL || !pdata->reset) { | |
132 | dev_err(&client->dev, "No reset GPIO in platform data\n"); | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | if (!i2c_check_functionality(client->adapter, | |
137 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
138 | dev_warn(&client->dev, | |
139 | "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); | |
140 | return -EIO; | |
141 | } | |
142 | ||
143 | bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL); | |
144 | if (!bd) | |
145 | return -ENOMEM; | |
146 | ||
147 | bd->client = client; | |
148 | bd->pdata = pdata; | |
149 | ||
150 | ret = devm_gpio_request_one(&client->dev, pdata->reset, | |
151 | GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset"); | |
152 | if (ret < 0) { | |
153 | dev_err(&client->dev, "unable to request reset GPIO\n"); | |
154 | return ret; | |
155 | } | |
156 | ||
157 | memset(&props, 0, sizeof(props)); | |
158 | props.type = BACKLIGHT_RAW; | |
159 | props.max_brightness = 128; | |
160 | props.brightness = clamp_t(unsigned int, pdata->def_value, 0, | |
161 | props.max_brightness); | |
162 | ||
26faf15c JH |
163 | backlight = devm_backlight_device_register(&client->dev, |
164 | dev_name(&client->dev), | |
67b43e59 LP |
165 | &bd->client->dev, bd, |
166 | &bd6107_backlight_ops, &props); | |
167 | if (IS_ERR(backlight)) { | |
168 | dev_err(&client->dev, "failed to register backlight\n"); | |
169 | return PTR_ERR(backlight); | |
170 | } | |
171 | ||
172 | backlight_update_status(backlight); | |
173 | i2c_set_clientdata(client, backlight); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static int bd6107_remove(struct i2c_client *client) | |
179 | { | |
180 | struct backlight_device *backlight = i2c_get_clientdata(client); | |
181 | ||
182 | backlight->props.brightness = 0; | |
183 | backlight_update_status(backlight); | |
67b43e59 LP |
184 | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static const struct i2c_device_id bd6107_ids[] = { | |
189 | { "bd6107", 0 }, | |
190 | { } | |
191 | }; | |
192 | MODULE_DEVICE_TABLE(i2c, bd6107_ids); | |
193 | ||
194 | static struct i2c_driver bd6107_driver = { | |
195 | .driver = { | |
196 | .name = "bd6107", | |
197 | }, | |
198 | .probe = bd6107_probe, | |
199 | .remove = bd6107_remove, | |
200 | .id_table = bd6107_ids, | |
201 | }; | |
202 | ||
203 | module_i2c_driver(bd6107_driver); | |
204 | ||
205 | MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver"); | |
206 | MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); | |
207 | MODULE_LICENSE("GPL"); |