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fbd1b17b DB |
1 | /* |
2 | * LCD / Backlight control code for Sharp SL-6000x (tosa) | |
3 | * | |
4 | * Copyright (c) 2005 Dirk Opfer | |
5 | * Copyright (c) 2007,2008 Dmitry Baryshkov | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/spi/spi.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/gpio.h> | |
19 | #include <linux/fb.h> | |
20 | #include <linux/backlight.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
fbd1b17b DB |
22 | |
23 | #include <asm/mach/sharpsl_param.h> | |
24 | ||
25 | #include <mach/tosa.h> | |
26 | ||
27 | #define COMADJ_DEFAULT 97 | |
28 | ||
29 | #define DAC_CH1 0 | |
30 | #define DAC_CH2 1 | |
31 | ||
32 | struct tosa_bl_data { | |
33 | struct i2c_client *i2c; | |
34 | struct backlight_device *bl; | |
35 | ||
36 | int comadj; | |
37 | }; | |
38 | ||
39 | static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness) | |
40 | { | |
41 | struct spi_device *spi = data->i2c->dev.platform_data; | |
42 | ||
43 | i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj); | |
44 | ||
45 | /* SetBacklightDuty */ | |
46 | i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff)); | |
47 | ||
48 | /* SetBacklightVR */ | |
49 | gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100); | |
50 | ||
51 | tosa_bl_enable(spi, brightness); | |
52 | } | |
53 | ||
54 | static int tosa_bl_update_status(struct backlight_device *dev) | |
55 | { | |
56 | struct backlight_properties *props = &dev->props; | |
57 | struct tosa_bl_data *data = dev_get_drvdata(&dev->dev); | |
58 | int power = max(props->power, props->fb_blank); | |
59 | int brightness = props->brightness; | |
60 | ||
61 | if (power) | |
62 | brightness = 0; | |
63 | ||
64 | tosa_bl_set_backlight(data, brightness); | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static int tosa_bl_get_brightness(struct backlight_device *dev) | |
70 | { | |
71 | struct backlight_properties *props = &dev->props; | |
72 | ||
73 | return props->brightness; | |
74 | } | |
75 | ||
9905a43b | 76 | static const struct backlight_ops bl_ops = { |
fbd1b17b DB |
77 | .get_brightness = tosa_bl_get_brightness, |
78 | .update_status = tosa_bl_update_status, | |
79 | }; | |
80 | ||
1b9e450d | 81 | static int tosa_bl_probe(struct i2c_client *client, |
fbd1b17b DB |
82 | const struct i2c_device_id *id) |
83 | { | |
a19a6ee6 | 84 | struct backlight_properties props; |
f072c890 | 85 | struct tosa_bl_data *data; |
fbd1b17b | 86 | int ret = 0; |
f072c890 JH |
87 | |
88 | data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data), | |
89 | GFP_KERNEL); | |
fbd1b17b DB |
90 | if (!data) |
91 | return -ENOMEM; | |
92 | ||
93 | data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj; | |
94 | ||
f5b71941 | 95 | ret = devm_gpio_request(&client->dev, TOSA_GPIO_BL_C20MA, "backlight"); |
fbd1b17b DB |
96 | if (ret) { |
97 | dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); | |
f072c890 | 98 | return ret; |
fbd1b17b DB |
99 | } |
100 | ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0); | |
101 | if (ret) | |
f5b71941 | 102 | return ret; |
fbd1b17b DB |
103 | |
104 | i2c_set_clientdata(client, data); | |
105 | data->i2c = client; | |
106 | ||
a19a6ee6 | 107 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 108 | props.type = BACKLIGHT_RAW; |
a19a6ee6 MG |
109 | props.max_brightness = 512 - 1; |
110 | data->bl = backlight_device_register("tosa-bl", &client->dev, data, | |
111 | &bl_ops, &props); | |
fbd1b17b DB |
112 | if (IS_ERR(data->bl)) { |
113 | ret = PTR_ERR(data->bl); | |
114 | goto err_reg; | |
115 | } | |
116 | ||
117 | data->bl->props.brightness = 69; | |
fbd1b17b DB |
118 | data->bl->props.power = FB_BLANK_UNBLANK; |
119 | ||
120 | backlight_update_status(data->bl); | |
121 | ||
122 | return 0; | |
123 | ||
124 | err_reg: | |
125 | data->bl = NULL; | |
fbd1b17b DB |
126 | return ret; |
127 | } | |
128 | ||
129 | static int __devexit tosa_bl_remove(struct i2c_client *client) | |
130 | { | |
131 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
132 | ||
133 | backlight_device_unregister(data->bl); | |
134 | data->bl = NULL; | |
fbd1b17b | 135 | |
fbd1b17b DB |
136 | return 0; |
137 | } | |
138 | ||
139 | #ifdef CONFIG_PM | |
140 | static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm) | |
141 | { | |
142 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
143 | ||
144 | tosa_bl_set_backlight(data, 0); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static int tosa_bl_resume(struct i2c_client *client) | |
150 | { | |
151 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
152 | ||
153 | backlight_update_status(data->bl); | |
154 | return 0; | |
155 | } | |
156 | #else | |
157 | #define tosa_bl_suspend NULL | |
158 | #define tosa_bl_resume NULL | |
159 | #endif | |
160 | ||
161 | static const struct i2c_device_id tosa_bl_id[] = { | |
162 | { "tosa-bl", 0 }, | |
163 | { }, | |
164 | }; | |
165 | ||
166 | ||
167 | static struct i2c_driver tosa_bl_driver = { | |
168 | .driver = { | |
169 | .name = "tosa-bl", | |
170 | .owner = THIS_MODULE, | |
171 | }, | |
172 | .probe = tosa_bl_probe, | |
d1723fa2 | 173 | .remove = tosa_bl_remove, |
fbd1b17b DB |
174 | .suspend = tosa_bl_suspend, |
175 | .resume = tosa_bl_resume, | |
176 | .id_table = tosa_bl_id, | |
177 | }; | |
178 | ||
81ce6864 | 179 | module_i2c_driver(tosa_bl_driver); |
fbd1b17b DB |
180 | |
181 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
182 | MODULE_LICENSE("GPL v2"); | |
183 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
184 |