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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>
21#include <linux/slab.h>
22#include <linux/module.h>
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
30#define DA9034_WLED_ISET(x) ((x) & 0x1f)
31
32#define DA9034_WLED_BOOST_EN (1 << 5)
33
34#define DA9030_MAX_BRIGHTNESS 7
35#define DA9034_MAX_BRIGHTNESS 0x7f
36
37struct da903x_backlight_data {
38 struct device *da903x_dev;
39 int id;
40 int current_brightness;
41};
42
43static 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
81static 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
91 return da903x_backlight_set(bl, brightness);
92}
93
94static int da903x_backlight_get_brightness(struct backlight_device *bl)
95{
96 struct da903x_backlight_data *data = bl_get_data(bl);
97 return data->current_brightness;
98}
99
100static const struct backlight_ops da903x_backlight_ops = {
101 .update_status = da903x_backlight_update_status,
102 .get_brightness = da903x_backlight_get_brightness,
103};
104
105static int da903x_backlight_probe(struct platform_device *pdev)
106{
107 struct da9034_backlight_pdata *pdata = pdev->dev.platform_data;
108 struct da903x_backlight_data *data;
109 struct backlight_device *bl;
110 struct backlight_properties props;
111 int max_brightness;
112
113 data = kzalloc(sizeof(*data), GFP_KERNEL);
114 if (data == NULL)
115 return -ENOMEM;
116
117 switch (pdev->id) {
118 case DA9030_ID_WLED:
119 max_brightness = DA9030_MAX_BRIGHTNESS;
120 break;
121 case DA9034_ID_WLED:
122 max_brightness = DA9034_MAX_BRIGHTNESS;
123 break;
124 default:
125 dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
126 pdev->id);
127 kfree(data);
128 return -EINVAL;
129 }
130
131 data->id = pdev->id;
132 data->da903x_dev = pdev->dev.parent;
133 data->current_brightness = 0;
134
135
136 if (pdata)
137 da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
138 DA9034_WLED_ISET(pdata->output_current));
139
140 props.type = BACKLIGHT_RAW;
141 props.max_brightness = max_brightness;
142 bl = backlight_device_register(pdev->name, data->da903x_dev, data,
143 &da903x_backlight_ops, &props);
144 if (IS_ERR(bl)) {
145 dev_err(&pdev->dev, "failed to register backlight\n");
146 kfree(data);
147 return PTR_ERR(bl);
148 }
149
150 bl->props.brightness = max_brightness;
151
152 platform_set_drvdata(pdev, bl);
153 backlight_update_status(bl);
154 return 0;
155}
156
157static int da903x_backlight_remove(struct platform_device *pdev)
158{
159 struct backlight_device *bl = platform_get_drvdata(pdev);
160 struct da903x_backlight_data *data = bl_get_data(bl);
161
162 backlight_device_unregister(bl);
163 kfree(data);
164 return 0;
165}
166
167#ifdef CONFIG_PM
168static int da903x_backlight_suspend(struct device *dev)
169{
170 struct platform_device *pdev = to_platform_device(dev);
171 struct backlight_device *bl = platform_get_drvdata(pdev);
172 return da903x_backlight_set(bl, 0);
173}
174
175static int da903x_backlight_resume(struct device *dev)
176{
177 struct platform_device *pdev = to_platform_device(dev);
178 struct backlight_device *bl = platform_get_drvdata(pdev);
179
180 backlight_update_status(bl);
181 return 0;
182}
183
184static const struct dev_pm_ops da903x_backlight_pm_ops = {
185 .suspend = da903x_backlight_suspend,
186 .resume = da903x_backlight_resume,
187};
188#endif
189
190static struct platform_driver da903x_backlight_driver = {
191 .driver = {
192 .name = "da903x-backlight",
193 .owner = THIS_MODULE,
194#ifdef CONFIG_PM
195 .pm = &da903x_backlight_pm_ops,
196#endif
197 },
198 .probe = da903x_backlight_probe,
199 .remove = da903x_backlight_remove,
200};
201
202module_platform_driver(da903x_backlight_driver);
203
204MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
205MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
206 "Mike Rapoport <mike@compulab.co.il>");
207MODULE_LICENSE("GPL");
208MODULE_ALIAS("platform:da903x-backlight");
209
