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Source at commit 5b8a6603d1f65b03cf6022990cee807cd4819409 created 11 years 11 months ago. By Lars-Peter Clausen, ili8960: Use module_spi_driver | |
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1 | /* |
2 | * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> |
3 | * Driver for Ilitek ili8960 LCD |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the |
7 | * Free Software Foundation; either version 2 of the License, or (at your |
8 | * option) any later version. |
9 | * |
10 | * You should have received a copy of the GNU General Public License along |
11 | * with this program; if not, write to the Free Software Foundation, Inc., |
12 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
13 | * |
14 | */ |
15 | |
16 | #include <linux/module.h> |
17 | #include <linux/spi/spi.h> |
18 | #include <linux/lcd.h> |
19 | #include <linux/backlight.h> |
20 | #include <linux/delay.h> |
21 | |
22 | struct ili8960 { |
23 | struct spi_device *spi; |
24 | struct lcd_device *lcd; |
25 | struct backlight_device *bl; |
26 | bool enabled; |
27 | unsigned int brightness; |
28 | }; |
29 | |
30 | #define ILI8960_REG_BRIGHTNESS 0x03 |
31 | #define ILI8960_REG_POWER 0x05 |
32 | #define ILI8960_REG_CONTRAST 0x0d |
33 | |
34 | static int ili8960_write_reg(struct spi_device *spi, uint8_t reg, |
35 | uint8_t data) |
36 | { |
37 | uint8_t buf[2]; |
38 | buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f); |
39 | buf[1] = data; |
40 | |
41 | return spi_write(spi, buf, sizeof(buf)); |
42 | } |
43 | |
44 | static int ili8960_programm_power(struct spi_device *spi, bool enabled) |
45 | { |
46 | int ret; |
47 | |
48 | if (enabled) |
49 | mdelay(20); |
50 | |
51 | ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6); |
52 | |
53 | if (!enabled) |
54 | mdelay(20); |
55 | |
56 | return ret; |
57 | } |
58 | |
59 | static int ili8960_set_power(struct lcd_device *lcd, int power) |
60 | { |
61 | struct ili8960 *ili8960 = lcd_get_data(lcd); |
62 | |
63 | switch (power) { |
64 | case FB_BLANK_UNBLANK: |
65 | ili8960->enabled = true; |
66 | break; |
67 | default: |
68 | ili8960->enabled = false; |
69 | break; |
70 | } |
71 | |
72 | return ili8960_programm_power(ili8960->spi, ili8960->enabled); |
73 | } |
74 | |
75 | static int ili8960_get_power(struct lcd_device *lcd) |
76 | { |
77 | struct ili8960 *ili8960 = lcd_get_data(lcd); |
78 | return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; |
79 | } |
80 | |
81 | static int ili8960_set_contrast(struct lcd_device *lcd, int contrast) |
82 | { |
83 | struct ili8960 *ili8960 = lcd_get_data(lcd); |
84 | |
85 | return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast); |
86 | } |
87 | |
88 | static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode) |
89 | { |
90 | if (mode->xres != 320 && mode->yres != 240) |
91 | return -EINVAL; |
92 | |
93 | return 0; |
94 | } |
95 | |
96 | static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness) |
97 | { |
98 | int ret; |
99 | |
100 | ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness); |
101 | |
102 | if (ret == 0) |
103 | ili8960->brightness = brightness; |
104 | |
105 | return ret; |
106 | } |
107 | |
108 | static ssize_t ili8960_show_brightness(struct device *dev, |
109 | struct device_attribute *attr, char *buf) |
110 | { |
111 | struct lcd_device *ld = to_lcd_device(dev); |
112 | struct ili8960 *ili8960 = lcd_get_data(ld); |
113 | |
114 | return sprintf(buf, "%u\n", ili8960->brightness); |
115 | } |
116 | |
117 | static ssize_t ili8960_store_brightness(struct device *dev, |
118 | struct device_attribute *attr, const char *buf, size_t count) |
119 | { |
120 | struct lcd_device *ld = to_lcd_device(dev); |
121 | struct ili8960 *ili8960 = lcd_get_data(ld); |
122 | unsigned long brightness; |
123 | int ret; |
124 | |
125 | ret = strict_strtoul(buf, 0, &brightness); |
126 | if (ret) |
127 | return ret; |
128 | |
129 | if (brightness > 255) |
130 | return -EINVAL; |
131 | |
132 | ili8960_set_brightness(ili8960, brightness); |
133 | |
134 | return count; |
135 | } |
136 | |
137 | |
138 | static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness, |
139 | ili8960_store_brightness); |
140 | |
141 | static struct lcd_ops ili8960_lcd_ops = { |
142 | .set_power = ili8960_set_power, |
143 | .get_power = ili8960_get_power, |
144 | .set_contrast = ili8960_set_contrast, |
145 | .set_mode = ili8960_set_mode, |
146 | }; |
147 | |
148 | static int __devinit ili8960_probe(struct spi_device *spi) |
149 | { |
150 | int ret; |
151 | struct ili8960 *ili8960; |
152 | |
153 | ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL); |
154 | if (!ili8960) |
155 | return -ENOMEM; |
156 | |
157 | spi->bits_per_word = 8; |
158 | spi->mode = SPI_MODE_3; |
159 | |
160 | ret = spi_setup(spi); |
161 | if (ret) { |
162 | dev_err(&spi->dev, "Failed to setup spi\n"); |
163 | goto err_free_ili8960; |
164 | } |
165 | |
166 | ili8960->spi = spi; |
167 | |
168 | ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960, |
169 | &ili8960_lcd_ops); |
170 | |
171 | if (IS_ERR(ili8960->lcd)) { |
172 | ret = PTR_ERR(ili8960->lcd); |
173 | dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret); |
174 | goto err_free_ili8960; |
175 | } |
176 | |
177 | ili8960->lcd->props.max_contrast = 255; |
178 | |
179 | ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness); |
180 | if (ret) |
181 | goto err_unregister_lcd; |
182 | |
183 | ili8960_programm_power(ili8960->spi, true); |
184 | ili8960->enabled = true; |
185 | |
186 | spi_set_drvdata(spi, ili8960); |
187 | |
188 | ili8960_write_reg(spi, 0x13, 0x01); |
189 | |
190 | return 0; |
191 | err_unregister_lcd: |
192 | lcd_device_unregister(ili8960->lcd); |
193 | err_free_ili8960: |
194 | kfree(ili8960); |
195 | return ret; |
196 | } |
197 | |
198 | static int __devexit ili8960_remove(struct spi_device *spi) |
199 | { |
200 | struct ili8960 *ili8960 = spi_get_drvdata(spi); |
201 | |
202 | device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness); |
203 | lcd_device_unregister(ili8960->lcd); |
204 | |
205 | spi_set_drvdata(spi, NULL); |
206 | kfree(ili8960); |
207 | return 0; |
208 | } |
209 | |
210 | #ifdef CONFIG_PM |
211 | |
212 | static int ili8960_suspend(struct spi_device *spi, pm_message_t state) |
213 | { |
214 | struct ili8960 *ili8960 = spi_get_drvdata(spi); |
215 | |
216 | if (ili8960->enabled) |
217 | ili8960_programm_power(ili8960->spi, false); |
218 | |
219 | return 0; |
220 | } |
221 | |
222 | static int ili8960_resume(struct spi_device *spi) |
223 | { |
224 | struct ili8960 *ili8960 = spi_get_drvdata(spi); |
225 | |
226 | if (ili8960->enabled) |
227 | ili8960_programm_power(ili8960->spi, true); |
228 | |
229 | return 0; |
230 | } |
231 | |
232 | #else |
233 | #define ili8960_suspend NULL |
234 | #define ili8960_resume NULL |
235 | #endif |
236 | |
237 | static struct spi_driver ili8960_driver = { |
238 | .driver = { |
239 | .name = "ili8960", |
240 | .owner = THIS_MODULE, |
241 | }, |
242 | .probe = ili8960_probe, |
243 | .remove = __devexit_p(ili8960_remove), |
244 | .suspend = ili8960_suspend, |
245 | .resume = ili8960_resume, |
246 | }; |
247 | module_spi_driver(ili8960_driver); |
248 | |
249 | MODULE_AUTHOR("Lars-Peter Clausen"); |
250 | MODULE_LICENSE("GPL"); |
251 | MODULE_DESCRIPTION("LCD driver for Ilitek ili8960"); |
252 | MODULE_ALIAS("spi:ili8960"); |
253 |
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