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923ae48b MR |
1 | /* |
2 | * Backlight driver for Dialog Semiconductor DA9030/DA9034 | |
3 | * | |
4 | * Copyright (C) 2008 Compulab, Ltd. | |
5 | * Mike Rapoport <mike@compulab.co.il> | |
6 | * | |
7 | * Copyright (C) 2006-2008 Marvell International Ltd. | |
8 | * Eric Miao <eric.miao@marvell.com> | |
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> |
923ae48b MR |
22 | |
23 | #define DA9030_WLED_CONTROL 0x25 | |
24 | #define DA9030_WLED_CP_EN (1 << 6) | |
25 | #define DA9030_WLED_TRIM(x) ((x) & 0x7) | |
26 | ||
27 | #define DA9034_WLED_CONTROL1 0x3C | |
28 | #define DA9034_WLED_CONTROL2 0x3D | |
b3a85495 | 29 | #define DA9034_WLED_ISET(x) ((x) & 0x1f) |
923ae48b MR |
30 | |
31 | #define DA9034_WLED_BOOST_EN (1 << 5) | |
32 | ||
33 | #define DA9030_MAX_BRIGHTNESS 7 | |
34 | #define DA9034_MAX_BRIGHTNESS 0x7f | |
35 | ||
36 | struct da903x_backlight_data { | |
37 | struct device *da903x_dev; | |
38 | int id; | |
39 | int current_brightness; | |
40 | }; | |
41 | ||
42 | static int da903x_backlight_set(struct backlight_device *bl, int brightness) | |
43 | { | |
44 | struct da903x_backlight_data *data = bl_get_data(bl); | |
45 | struct device *dev = data->da903x_dev; | |
46 | uint8_t val; | |
47 | int ret = 0; | |
48 | ||
49 | switch (data->id) { | |
50 | case DA9034_ID_WLED: | |
51 | ret = da903x_update(dev, DA9034_WLED_CONTROL1, | |
52 | brightness, 0x7f); | |
53 | if (ret) | |
54 | return ret; | |
55 | ||
56 | if (data->current_brightness && brightness == 0) | |
57 | ret = da903x_clr_bits(dev, | |
58 | DA9034_WLED_CONTROL2, | |
59 | DA9034_WLED_BOOST_EN); | |
60 | ||
61 | if (data->current_brightness == 0 && brightness) | |
62 | ret = da903x_set_bits(dev, | |
63 | DA9034_WLED_CONTROL2, | |
64 | DA9034_WLED_BOOST_EN); | |
65 | break; | |
66 | case DA9030_ID_WLED: | |
67 | val = DA9030_WLED_TRIM(brightness); | |
68 | val |= brightness ? DA9030_WLED_CP_EN : 0; | |
69 | ret = da903x_write(dev, DA9030_WLED_CONTROL, val); | |
70 | break; | |
71 | } | |
72 | ||
73 | if (ret) | |
74 | return ret; | |
75 | ||
76 | data->current_brightness = brightness; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static int da903x_backlight_update_status(struct backlight_device *bl) | |
81 | { | |
82 | int brightness = bl->props.brightness; | |
83 | ||
84 | if (bl->props.power != FB_BLANK_UNBLANK) | |
85 | brightness = 0; | |
86 | ||
87 | if (bl->props.fb_blank != FB_BLANK_UNBLANK) | |
88 | brightness = 0; | |
89 | ||
90 | return da903x_backlight_set(bl, brightness); | |
91 | } | |
92 | ||
93 | static int da903x_backlight_get_brightness(struct backlight_device *bl) | |
94 | { | |
95 | struct da903x_backlight_data *data = bl_get_data(bl); | |
96 | return data->current_brightness; | |
97 | } | |
98 | ||
9905a43b | 99 | static const struct backlight_ops da903x_backlight_ops = { |
923ae48b MR |
100 | .update_status = da903x_backlight_update_status, |
101 | .get_brightness = da903x_backlight_get_brightness, | |
102 | }; | |
103 | ||
104 | static int da903x_backlight_probe(struct platform_device *pdev) | |
105 | { | |
b3a85495 | 106 | struct da9034_backlight_pdata *pdata = pdev->dev.platform_data; |
923ae48b MR |
107 | struct da903x_backlight_data *data; |
108 | struct backlight_device *bl; | |
a19a6ee6 | 109 | struct backlight_properties props; |
923ae48b MR |
110 | int max_brightness; |
111 | ||
112 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
113 | if (data == NULL) | |
114 | return -ENOMEM; | |
115 | ||
116 | switch (pdev->id) { | |
117 | case DA9030_ID_WLED: | |
118 | max_brightness = DA9030_MAX_BRIGHTNESS; | |
119 | break; | |
120 | case DA9034_ID_WLED: | |
121 | max_brightness = DA9034_MAX_BRIGHTNESS; | |
122 | break; | |
123 | default: | |
124 | dev_err(&pdev->dev, "invalid backlight device ID(%d)\n", | |
125 | pdev->id); | |
c0d861af | 126 | kfree(data); |
923ae48b MR |
127 | return -EINVAL; |
128 | } | |
129 | ||
130 | data->id = pdev->id; | |
131 | data->da903x_dev = pdev->dev.parent; | |
132 | data->current_brightness = 0; | |
133 | ||
b3a85495 HZ |
134 | /* adjust the WLED output current */ |
135 | if (pdata) | |
136 | da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2, | |
137 | DA9034_WLED_ISET(pdata->output_current)); | |
138 | ||
a19a6ee6 MG |
139 | props.max_brightness = max_brightness; |
140 | bl = backlight_device_register(pdev->name, data->da903x_dev, data, | |
141 | &da903x_backlight_ops, &props); | |
923ae48b MR |
142 | if (IS_ERR(bl)) { |
143 | dev_err(&pdev->dev, "failed to register backlight\n"); | |
f55491a4 | 144 | kfree(data); |
923ae48b MR |
145 | return PTR_ERR(bl); |
146 | } | |
147 | ||
923ae48b MR |
148 | bl->props.brightness = max_brightness; |
149 | ||
150 | platform_set_drvdata(pdev, bl); | |
151 | backlight_update_status(bl); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static int da903x_backlight_remove(struct platform_device *pdev) | |
156 | { | |
157 | struct backlight_device *bl = platform_get_drvdata(pdev); | |
158 | struct da903x_backlight_data *data = bl_get_data(bl); | |
159 | ||
160 | backlight_device_unregister(bl); | |
161 | kfree(data); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | #ifdef CONFIG_PM | |
43ddc006 | 166 | static int da903x_backlight_suspend(struct device *dev) |
923ae48b | 167 | { |
43ddc006 | 168 | struct platform_device *pdev = to_platform_device(dev); |
923ae48b MR |
169 | struct backlight_device *bl = platform_get_drvdata(pdev); |
170 | return da903x_backlight_set(bl, 0); | |
171 | } | |
172 | ||
43ddc006 | 173 | static int da903x_backlight_resume(struct device *dev) |
923ae48b | 174 | { |
43ddc006 | 175 | struct platform_device *pdev = to_platform_device(dev); |
923ae48b MR |
176 | struct backlight_device *bl = platform_get_drvdata(pdev); |
177 | ||
178 | backlight_update_status(bl); | |
179 | return 0; | |
180 | } | |
43ddc006 | 181 | |
47145210 | 182 | static const struct dev_pm_ops da903x_backlight_pm_ops = { |
43ddc006 MR |
183 | .suspend = da903x_backlight_suspend, |
184 | .resume = da903x_backlight_resume, | |
185 | }; | |
923ae48b MR |
186 | #endif |
187 | ||
188 | static struct platform_driver da903x_backlight_driver = { | |
189 | .driver = { | |
190 | .name = "da903x-backlight", | |
191 | .owner = THIS_MODULE, | |
43ddc006 MR |
192 | #ifdef CONFIG_PM |
193 | .pm = &da903x_backlight_pm_ops, | |
194 | #endif | |
923ae48b MR |
195 | }, |
196 | .probe = da903x_backlight_probe, | |
197 | .remove = da903x_backlight_remove, | |
923ae48b MR |
198 | }; |
199 | ||
200 | static int __init da903x_backlight_init(void) | |
201 | { | |
202 | return platform_driver_register(&da903x_backlight_driver); | |
203 | } | |
204 | module_init(da903x_backlight_init); | |
205 | ||
206 | static void __exit da903x_backlight_exit(void) | |
207 | { | |
208 | platform_driver_unregister(&da903x_backlight_driver); | |
209 | } | |
210 | module_exit(da903x_backlight_exit); | |
211 | ||
212 | MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034"); | |
213 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>" | |
214 | "Mike Rapoport <mike@compulab.co.il>"); | |
215 | MODULE_LICENSE("GPL"); | |
216 | MODULE_ALIAS("platform:da903x-backlight"); |