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923ae48b MR |
1 | /* |
2 | * Backlight driver for Dialog Semiconductor DA9030/DA9034 | |
3 | * | |
4 | * Copyright (C) 2008 Compulab, Ltd. | |
685746d4 | 5 | * Mike Rapoport <mike@compulab.co.il> |
923ae48b MR |
6 | * |
7 | * Copyright (C) 2006-2008 Marvell International Ltd. | |
685746d4 | 8 | * Eric Miao <eric.miao@marvell.com> |
923ae48b MR |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/fb.h> | |
19 | #include <linux/backlight.h> | |
20 | #include <linux/mfd/da903x.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
355b200b | 22 | #include <linux/module.h> |
923ae48b MR |
23 | |
24 | #define DA9030_WLED_CONTROL 0x25 | |
25 | #define DA9030_WLED_CP_EN (1 << 6) | |
26 | #define DA9030_WLED_TRIM(x) ((x) & 0x7) | |
27 | ||
28 | #define DA9034_WLED_CONTROL1 0x3C | |
29 | #define DA9034_WLED_CONTROL2 0x3D | |
b3a85495 | 30 | #define DA9034_WLED_ISET(x) ((x) & 0x1f) |
923ae48b MR |
31 | |
32 | #define DA9034_WLED_BOOST_EN (1 << 5) | |
33 | ||
34 | #define DA9030_MAX_BRIGHTNESS 7 | |
35 | #define DA9034_MAX_BRIGHTNESS 0x7f | |
36 | ||
37 | struct da903x_backlight_data { | |
38 | struct device *da903x_dev; | |
39 | int id; | |
40 | int current_brightness; | |
41 | }; | |
42 | ||
43 | static int da903x_backlight_set(struct backlight_device *bl, int brightness) | |
44 | { | |
45 | struct da903x_backlight_data *data = bl_get_data(bl); | |
46 | struct device *dev = data->da903x_dev; | |
47 | uint8_t val; | |
48 | int ret = 0; | |
49 | ||
50 | switch (data->id) { | |
51 | case DA9034_ID_WLED: | |
52 | ret = da903x_update(dev, DA9034_WLED_CONTROL1, | |
53 | brightness, 0x7f); | |
54 | if (ret) | |
55 | return ret; | |
56 | ||
57 | if (data->current_brightness && brightness == 0) | |
58 | ret = da903x_clr_bits(dev, | |
59 | DA9034_WLED_CONTROL2, | |
60 | DA9034_WLED_BOOST_EN); | |
61 | ||
62 | if (data->current_brightness == 0 && brightness) | |
63 | ret = da903x_set_bits(dev, | |
64 | DA9034_WLED_CONTROL2, | |
65 | DA9034_WLED_BOOST_EN); | |
66 | break; | |
67 | case DA9030_ID_WLED: | |
68 | val = DA9030_WLED_TRIM(brightness); | |
69 | val |= brightness ? DA9030_WLED_CP_EN : 0; | |
70 | ret = da903x_write(dev, DA9030_WLED_CONTROL, val); | |
71 | break; | |
72 | } | |
73 | ||
74 | if (ret) | |
75 | return ret; | |
76 | ||
77 | data->current_brightness = brightness; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int da903x_backlight_update_status(struct backlight_device *bl) | |
82 | { | |
83 | int brightness = bl->props.brightness; | |
84 | ||
85 | if (bl->props.power != FB_BLANK_UNBLANK) | |
86 | brightness = 0; | |
87 | ||
88 | if (bl->props.fb_blank != FB_BLANK_UNBLANK) | |
89 | brightness = 0; | |
90 | ||
d1720b57 JH |
91 | if (bl->props.state & BL_CORE_SUSPENDED) |
92 | brightness = 0; | |
93 | ||
923ae48b MR |
94 | return da903x_backlight_set(bl, brightness); |
95 | } | |
96 | ||
97 | static int da903x_backlight_get_brightness(struct backlight_device *bl) | |
98 | { | |
99 | struct da903x_backlight_data *data = bl_get_data(bl); | |
d1720b57 | 100 | |
923ae48b MR |
101 | return data->current_brightness; |
102 | } | |
103 | ||
9905a43b | 104 | static const struct backlight_ops da903x_backlight_ops = { |
d1720b57 | 105 | .options = BL_CORE_SUSPENDRESUME, |
923ae48b MR |
106 | .update_status = da903x_backlight_update_status, |
107 | .get_brightness = da903x_backlight_get_brightness, | |
108 | }; | |
109 | ||
110 | static int da903x_backlight_probe(struct platform_device *pdev) | |
111 | { | |
c512794c | 112 | struct da9034_backlight_pdata *pdata = dev_get_platdata(&pdev->dev); |
923ae48b MR |
113 | struct da903x_backlight_data *data; |
114 | struct backlight_device *bl; | |
a19a6ee6 | 115 | struct backlight_properties props; |
923ae48b MR |
116 | int max_brightness; |
117 | ||
ce969228 | 118 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
923ae48b MR |
119 | if (data == NULL) |
120 | return -ENOMEM; | |
121 | ||
122 | switch (pdev->id) { | |
123 | case DA9030_ID_WLED: | |
124 | max_brightness = DA9030_MAX_BRIGHTNESS; | |
125 | break; | |
126 | case DA9034_ID_WLED: | |
127 | max_brightness = DA9034_MAX_BRIGHTNESS; | |
128 | break; | |
129 | default: | |
130 | dev_err(&pdev->dev, "invalid backlight device ID(%d)\n", | |
131 | pdev->id); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
135 | data->id = pdev->id; | |
136 | data->da903x_dev = pdev->dev.parent; | |
137 | data->current_brightness = 0; | |
138 | ||
b3a85495 HZ |
139 | /* adjust the WLED output current */ |
140 | if (pdata) | |
141 | da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2, | |
142 | DA9034_WLED_ISET(pdata->output_current)); | |
143 | ||
f5f4fd45 | 144 | memset(&props, 0, sizeof(props)); |
bb7ca747 | 145 | props.type = BACKLIGHT_RAW; |
a19a6ee6 | 146 | props.max_brightness = max_brightness; |
56445293 JH |
147 | bl = devm_backlight_device_register(&pdev->dev, pdev->name, |
148 | data->da903x_dev, data, | |
149 | &da903x_backlight_ops, &props); | |
923ae48b MR |
150 | if (IS_ERR(bl)) { |
151 | dev_err(&pdev->dev, "failed to register backlight\n"); | |
152 | return PTR_ERR(bl); | |
153 | } | |
154 | ||
923ae48b MR |
155 | bl->props.brightness = max_brightness; |
156 | ||
157 | platform_set_drvdata(pdev, bl); | |
158 | backlight_update_status(bl); | |
159 | return 0; | |
160 | } | |
161 | ||
923ae48b MR |
162 | static struct platform_driver da903x_backlight_driver = { |
163 | .driver = { | |
164 | .name = "da903x-backlight", | |
923ae48b MR |
165 | }, |
166 | .probe = da903x_backlight_probe, | |
923ae48b MR |
167 | }; |
168 | ||
81178e02 | 169 | module_platform_driver(da903x_backlight_driver); |
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170 | |
171 | MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034"); | |
685746d4 JH |
172 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); |
173 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
923ae48b MR |
174 | MODULE_LICENSE("GPL"); |
175 | MODULE_ALIAS("platform:da903x-backlight"); |