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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 | { | |
c512794c | 41 | struct spi_device *spi = dev_get_platdata(&data->i2c->dev); |
fbd1b17b DB |
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; | |
42109b3c | 57 | struct tosa_bl_data *data = bl_get_data(dev); |
fbd1b17b DB |
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 | ||
05a5d4d2 JH |
95 | ret = devm_gpio_request_one(&client->dev, TOSA_GPIO_BL_C20MA, |
96 | GPIOF_OUT_INIT_LOW, "backlight"); | |
fbd1b17b DB |
97 | if (ret) { |
98 | dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); | |
f072c890 | 99 | return ret; |
fbd1b17b | 100 | } |
fbd1b17b DB |
101 | |
102 | i2c_set_clientdata(client, data); | |
103 | data->i2c = client; | |
104 | ||
a19a6ee6 | 105 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 106 | props.type = BACKLIGHT_RAW; |
a19a6ee6 | 107 | props.max_brightness = 512 - 1; |
ffb1f6c8 JH |
108 | data->bl = devm_backlight_device_register(&client->dev, "tosa-bl", |
109 | &client->dev, data, &bl_ops, | |
110 | &props); | |
fbd1b17b DB |
111 | if (IS_ERR(data->bl)) { |
112 | ret = PTR_ERR(data->bl); | |
113 | goto err_reg; | |
114 | } | |
115 | ||
116 | data->bl->props.brightness = 69; | |
fbd1b17b DB |
117 | data->bl->props.power = FB_BLANK_UNBLANK; |
118 | ||
119 | backlight_update_status(data->bl); | |
120 | ||
121 | return 0; | |
122 | ||
123 | err_reg: | |
124 | data->bl = NULL; | |
fbd1b17b DB |
125 | return ret; |
126 | } | |
127 | ||
7e4b9d0b | 128 | static int tosa_bl_remove(struct i2c_client *client) |
fbd1b17b DB |
129 | { |
130 | struct tosa_bl_data *data = i2c_get_clientdata(client); | |
131 | ||
fbd1b17b | 132 | data->bl = NULL; |
fbd1b17b DB |
133 | return 0; |
134 | } | |
135 | ||
1dde37d4 JH |
136 | #ifdef CONFIG_PM_SLEEP |
137 | static int tosa_bl_suspend(struct device *dev) | |
fbd1b17b | 138 | { |
1dde37d4 | 139 | struct tosa_bl_data *data = dev_get_drvdata(dev); |
fbd1b17b DB |
140 | |
141 | tosa_bl_set_backlight(data, 0); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
1dde37d4 | 146 | static int tosa_bl_resume(struct device *dev) |
fbd1b17b | 147 | { |
1dde37d4 | 148 | struct tosa_bl_data *data = dev_get_drvdata(dev); |
fbd1b17b DB |
149 | |
150 | backlight_update_status(data->bl); | |
151 | return 0; | |
152 | } | |
fbd1b17b DB |
153 | #endif |
154 | ||
1dde37d4 JH |
155 | static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume); |
156 | ||
fbd1b17b DB |
157 | static const struct i2c_device_id tosa_bl_id[] = { |
158 | { "tosa-bl", 0 }, | |
159 | { }, | |
160 | }; | |
13d20b3b | 161 | MODULE_DEVICE_TABLE(i2c, tosa_bl_id); |
fbd1b17b | 162 | |
fbd1b17b DB |
163 | static struct i2c_driver tosa_bl_driver = { |
164 | .driver = { | |
165 | .name = "tosa-bl", | |
1dde37d4 | 166 | .pm = &tosa_bl_pm_ops, |
fbd1b17b DB |
167 | }, |
168 | .probe = tosa_bl_probe, | |
d1723fa2 | 169 | .remove = tosa_bl_remove, |
fbd1b17b DB |
170 | .id_table = tosa_bl_id, |
171 | }; | |
172 | ||
81ce6864 | 173 | module_i2c_driver(tosa_bl_driver); |
fbd1b17b DB |
174 | |
175 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
176 | MODULE_LICENSE("GPL v2"); | |
177 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
178 |