]>
Commit | Line | Data |
---|---|---|
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> | |
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 DB |
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 | { | |
83 | struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL); | |
84 | int ret = 0; | |
85 | if (!data) | |
86 | return -ENOMEM; | |
87 | ||
88 | data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj; | |
89 | ||
90 | ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight"); | |
91 | if (ret) { | |
92 | dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); | |
93 | goto err_gpio_bl; | |
94 | } | |
95 | ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0); | |
96 | if (ret) | |
97 | goto err_gpio_dir; | |
98 | ||
99 | i2c_set_clientdata(client, data); | |
100 | data->i2c = client; | |
101 | ||
102 | data->bl = backlight_device_register("tosa-bl", &client->dev, | |
103 | data, &bl_ops); | |
104 | if (IS_ERR(data->bl)) { | |
105 | ret = PTR_ERR(data->bl); | |
106 | goto err_reg; | |
107 | } | |
108 | ||
109 | data->bl->props.brightness = 69; | |
110 | data->bl->props.max_brightness = 512 - 1; | |
111 | data->bl->props.power = FB_BLANK_UNBLANK; | |
112 | ||
113 | backlight_update_status(data->bl); | |
114 | ||
115 | return 0; | |
116 | ||
117 | err_reg: | |
118 | data->bl = NULL; | |
119 | i2c_set_clientdata(client, NULL); | |
120 | err_gpio_dir: | |
121 | gpio_free(TOSA_GPIO_BL_C20MA); | |
122 | err_gpio_bl: | |
123 | kfree(data); | |
124 | return ret; | |
125 | } | |
126 | ||
127 | static int __devexit tosa_bl_remove(struct i2c_client *client) | |
128 | { | |
129 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
130 | ||
131 | backlight_device_unregister(data->bl); | |
132 | data->bl = NULL; | |
133 | i2c_set_clientdata(client, NULL); | |
134 | ||
135 | gpio_free(TOSA_GPIO_BL_C20MA); | |
136 | ||
137 | kfree(data); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | #ifdef CONFIG_PM | |
143 | static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm) | |
144 | { | |
145 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
146 | ||
147 | tosa_bl_set_backlight(data, 0); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int tosa_bl_resume(struct i2c_client *client) | |
153 | { | |
154 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
155 | ||
156 | backlight_update_status(data->bl); | |
157 | return 0; | |
158 | } | |
159 | #else | |
160 | #define tosa_bl_suspend NULL | |
161 | #define tosa_bl_resume NULL | |
162 | #endif | |
163 | ||
164 | static const struct i2c_device_id tosa_bl_id[] = { | |
165 | { "tosa-bl", 0 }, | |
166 | { }, | |
167 | }; | |
168 | ||
169 | ||
170 | static struct i2c_driver tosa_bl_driver = { | |
171 | .driver = { | |
172 | .name = "tosa-bl", | |
173 | .owner = THIS_MODULE, | |
174 | }, | |
175 | .probe = tosa_bl_probe, | |
176 | .remove = __devexit_p(tosa_bl_remove), | |
177 | .suspend = tosa_bl_suspend, | |
178 | .resume = tosa_bl_resume, | |
179 | .id_table = tosa_bl_id, | |
180 | }; | |
181 | ||
182 | static int __init tosa_bl_init(void) | |
183 | { | |
184 | return i2c_add_driver(&tosa_bl_driver); | |
185 | } | |
186 | ||
187 | static void __exit tosa_bl_exit(void) | |
188 | { | |
189 | i2c_del_driver(&tosa_bl_driver); | |
190 | } | |
191 | ||
192 | module_init(tosa_bl_init); | |
193 | module_exit(tosa_bl_exit); | |
194 | ||
195 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
196 | MODULE_LICENSE("GPL v2"); | |
197 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
198 |