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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 | ||
81 | static int __devinit tosa_bl_probe(struct i2c_client *client, | |
82 | const struct i2c_device_id *id) | |
83 | { | |
a19a6ee6 | 84 | struct backlight_properties props; |
fbd1b17b DB |
85 | struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL); |
86 | int ret = 0; | |
87 | if (!data) | |
88 | return -ENOMEM; | |
89 | ||
90 | data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj; | |
91 | ||
92 | ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight"); | |
93 | if (ret) { | |
94 | dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); | |
95 | goto err_gpio_bl; | |
96 | } | |
97 | ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0); | |
98 | if (ret) | |
99 | goto err_gpio_dir; | |
100 | ||
101 | i2c_set_clientdata(client, data); | |
102 | data->i2c = client; | |
103 | ||
a19a6ee6 MG |
104 | memset(&props, 0, sizeof(struct backlight_properties)); |
105 | props.max_brightness = 512 - 1; | |
106 | data->bl = backlight_device_register("tosa-bl", &client->dev, data, | |
107 | &bl_ops, &props); | |
fbd1b17b DB |
108 | if (IS_ERR(data->bl)) { |
109 | ret = PTR_ERR(data->bl); | |
110 | goto err_reg; | |
111 | } | |
112 | ||
113 | data->bl->props.brightness = 69; | |
fbd1b17b DB |
114 | data->bl->props.power = FB_BLANK_UNBLANK; |
115 | ||
116 | backlight_update_status(data->bl); | |
117 | ||
118 | return 0; | |
119 | ||
120 | err_reg: | |
121 | data->bl = NULL; | |
fbd1b17b DB |
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; | |
fbd1b17b DB |
135 | |
136 | gpio_free(TOSA_GPIO_BL_C20MA); | |
137 | ||
138 | kfree(data); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | #ifdef CONFIG_PM | |
144 | static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm) | |
145 | { | |
146 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
147 | ||
148 | tosa_bl_set_backlight(data, 0); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int tosa_bl_resume(struct i2c_client *client) | |
154 | { | |
155 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
156 | ||
157 | backlight_update_status(data->bl); | |
158 | return 0; | |
159 | } | |
160 | #else | |
161 | #define tosa_bl_suspend NULL | |
162 | #define tosa_bl_resume NULL | |
163 | #endif | |
164 | ||
165 | static const struct i2c_device_id tosa_bl_id[] = { | |
166 | { "tosa-bl", 0 }, | |
167 | { }, | |
168 | }; | |
169 | ||
170 | ||
171 | static struct i2c_driver tosa_bl_driver = { | |
172 | .driver = { | |
173 | .name = "tosa-bl", | |
174 | .owner = THIS_MODULE, | |
175 | }, | |
176 | .probe = tosa_bl_probe, | |
177 | .remove = __devexit_p(tosa_bl_remove), | |
178 | .suspend = tosa_bl_suspend, | |
179 | .resume = tosa_bl_resume, | |
180 | .id_table = tosa_bl_id, | |
181 | }; | |
182 | ||
183 | static int __init tosa_bl_init(void) | |
184 | { | |
185 | return i2c_add_driver(&tosa_bl_driver); | |
186 | } | |
187 | ||
188 | static void __exit tosa_bl_exit(void) | |
189 | { | |
190 | i2c_del_driver(&tosa_bl_driver); | |
191 | } | |
192 | ||
193 | module_init(tosa_bl_init); | |
194 | module_exit(tosa_bl_exit); | |
195 | ||
196 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
197 | MODULE_LICENSE("GPL v2"); | |
198 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
199 |