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fbd1b17b DES |
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> | |
21 | ||
22 | #include <asm/mach/sharpsl_param.h> | |
23 | ||
24 | #include <mach/tosa.h> | |
25 | ||
26 | #define COMADJ_DEFAULT 97 | |
27 | ||
28 | #define DAC_CH1 0 | |
29 | #define DAC_CH2 1 | |
30 | ||
31 | struct tosa_bl_data { | |
32 | struct i2c_client *i2c; | |
33 | struct backlight_device *bl; | |
34 | ||
35 | int comadj; | |
36 | }; | |
37 | ||
38 | static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness) | |
39 | { | |
40 | struct spi_device *spi = data->i2c->dev.platform_data; | |
41 | ||
42 | i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj); | |
43 | ||
44 | /* SetBacklightDuty */ | |
45 | i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff)); | |
46 | ||
47 | /* SetBacklightVR */ | |
48 | gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100); | |
49 | ||
50 | tosa_bl_enable(spi, brightness); | |
51 | } | |
52 | ||
53 | static int tosa_bl_update_status(struct backlight_device *dev) | |
54 | { | |
55 | struct backlight_properties *props = &dev->props; | |
56 | struct tosa_bl_data *data = dev_get_drvdata(&dev->dev); | |
57 | int power = max(props->power, props->fb_blank); | |
58 | int brightness = props->brightness; | |
59 | ||
60 | if (power) | |
61 | brightness = 0; | |
62 | ||
63 | tosa_bl_set_backlight(data, brightness); | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static int tosa_bl_get_brightness(struct backlight_device *dev) | |
69 | { | |
70 | struct backlight_properties *props = &dev->props; | |
71 | ||
72 | return props->brightness; | |
73 | } | |
74 | ||
9905a43b | 75 | static const struct backlight_ops bl_ops = { |
fbd1b17b DES |
76 | .get_brightness = tosa_bl_get_brightness, |
77 | .update_status = tosa_bl_update_status, | |
78 | }; | |
79 | ||
80 | static int __devinit tosa_bl_probe(struct i2c_client *client, | |
81 | const struct i2c_device_id *id) | |
82 | { | |
a19a6ee6 | 83 | struct backlight_properties props; |
fbd1b17b DES |
84 | struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL); |
85 | int ret = 0; | |
86 | if (!data) | |
87 | return -ENOMEM; | |
88 | ||
89 | data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj; | |
90 | ||
91 | ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight"); | |
92 | if (ret) { | |
93 | dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); | |
94 | goto err_gpio_bl; | |
95 | } | |
96 | ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0); | |
97 | if (ret) | |
98 | goto err_gpio_dir; | |
99 | ||
100 | i2c_set_clientdata(client, data); | |
101 | data->i2c = client; | |
102 | ||
a19a6ee6 MG |
103 | memset(&props, 0, sizeof(struct backlight_properties)); |
104 | props.max_brightness = 512 - 1; | |
105 | data->bl = backlight_device_register("tosa-bl", &client->dev, data, | |
106 | &bl_ops, &props); | |
fbd1b17b DES |
107 | if (IS_ERR(data->bl)) { |
108 | ret = PTR_ERR(data->bl); | |
109 | goto err_reg; | |
110 | } | |
111 | ||
112 | data->bl->props.brightness = 69; | |
fbd1b17b DES |
113 | data->bl->props.power = FB_BLANK_UNBLANK; |
114 | ||
115 | backlight_update_status(data->bl); | |
116 | ||
117 | return 0; | |
118 | ||
119 | err_reg: | |
120 | data->bl = NULL; | |
121 | i2c_set_clientdata(client, NULL); | |
122 | err_gpio_dir: | |
123 | gpio_free(TOSA_GPIO_BL_C20MA); | |
124 | err_gpio_bl: | |
125 | kfree(data); | |
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; | |
135 | i2c_set_clientdata(client, NULL); | |
136 | ||
137 | gpio_free(TOSA_GPIO_BL_C20MA); | |
138 | ||
139 | kfree(data); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | #ifdef CONFIG_PM | |
145 | static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm) | |
146 | { | |
147 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
148 | ||
149 | tosa_bl_set_backlight(data, 0); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static int tosa_bl_resume(struct i2c_client *client) | |
155 | { | |
156 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
157 | ||
158 | backlight_update_status(data->bl); | |
159 | return 0; | |
160 | } | |
161 | #else | |
162 | #define tosa_bl_suspend NULL | |
163 | #define tosa_bl_resume NULL | |
164 | #endif | |
165 | ||
166 | static const struct i2c_device_id tosa_bl_id[] = { | |
167 | { "tosa-bl", 0 }, | |
168 | { }, | |
169 | }; | |
170 | ||
171 | ||
172 | static struct i2c_driver tosa_bl_driver = { | |
173 | .driver = { | |
174 | .name = "tosa-bl", | |
175 | .owner = THIS_MODULE, | |
176 | }, | |
177 | .probe = tosa_bl_probe, | |
178 | .remove = __devexit_p(tosa_bl_remove), | |
179 | .suspend = tosa_bl_suspend, | |
180 | .resume = tosa_bl_resume, | |
181 | .id_table = tosa_bl_id, | |
182 | }; | |
183 | ||
184 | static int __init tosa_bl_init(void) | |
185 | { | |
186 | return i2c_add_driver(&tosa_bl_driver); | |
187 | } | |
188 | ||
189 | static void __exit tosa_bl_exit(void) | |
190 | { | |
191 | i2c_del_driver(&tosa_bl_driver); | |
192 | } | |
193 | ||
194 | module_init(tosa_bl_init); | |
195 | module_exit(tosa_bl_exit); | |
196 | ||
197 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
198 | MODULE_LICENSE("GPL v2"); | |
199 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
200 |