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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * LCD Lowlevel Control Abstraction | |
3 | * | |
4 | * Copyright (C) 2003,2004 Hewlett-Packard Company | |
5 | * | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | #include <linux/module.h> |
9 | #include <linux/init.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/lcd.h> | |
12 | #include <linux/notifier.h> | |
13 | #include <linux/ctype.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/fb.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 | 17 | |
3d5eeadd JS |
18 | #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \ |
19 | defined(CONFIG_LCD_CLASS_DEVICE_MODULE)) | |
20 | /* This callback gets called when something important happens inside a | |
21 | * framebuffer driver. We're looking if that important event is blanking, | |
22 | * and if it is, we're switching lcd power as well ... | |
23 | */ | |
24 | static int fb_notifier_callback(struct notifier_block *self, | |
25 | unsigned long event, void *data) | |
26 | { | |
27 | struct lcd_device *ld; | |
28 | struct fb_event *evdata = data; | |
29 | ||
30 | /* If we aren't interested in this event, skip it immediately ... */ | |
faa312da EM |
31 | switch (event) { |
32 | case FB_EVENT_BLANK: | |
33 | case FB_EVENT_MODE_CHANGE: | |
34 | case FB_EVENT_MODE_CHANGE_ALL: | |
35 | break; | |
36 | default: | |
3d5eeadd | 37 | return 0; |
faa312da | 38 | } |
3d5eeadd JS |
39 | |
40 | ld = container_of(self, struct lcd_device, fb_notif); | |
faa312da EM |
41 | if (!ld->ops) |
42 | return 0; | |
43 | ||
599a52d1 | 44 | mutex_lock(&ld->ops_lock); |
faa312da | 45 | if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) { |
b3b4dc88 BD |
46 | if (event == FB_EVENT_BLANK) { |
47 | if (ld->ops->set_power) | |
48 | ld->ops->set_power(ld, *(int *)evdata->data); | |
49 | } else { | |
50 | if (ld->ops->set_mode) | |
51 | ld->ops->set_mode(ld, evdata->data); | |
52 | } | |
faa312da | 53 | } |
599a52d1 | 54 | mutex_unlock(&ld->ops_lock); |
3d5eeadd JS |
55 | return 0; |
56 | } | |
57 | ||
58 | static int lcd_register_fb(struct lcd_device *ld) | |
59 | { | |
1e0fa6bd | 60 | memset(&ld->fb_notif, 0, sizeof(ld->fb_notif)); |
3d5eeadd JS |
61 | ld->fb_notif.notifier_call = fb_notifier_callback; |
62 | return fb_register_client(&ld->fb_notif); | |
63 | } | |
64 | ||
65 | static void lcd_unregister_fb(struct lcd_device *ld) | |
66 | { | |
67 | fb_unregister_client(&ld->fb_notif); | |
68 | } | |
69 | #else | |
70 | static int lcd_register_fb(struct lcd_device *ld) | |
71 | { | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static inline void lcd_unregister_fb(struct lcd_device *ld) | |
76 | { | |
77 | } | |
78 | #endif /* CONFIG_FB */ | |
79 | ||
655bfd7a RP |
80 | static ssize_t lcd_show_power(struct device *dev, struct device_attribute *attr, |
81 | char *buf) | |
1da177e4 LT |
82 | { |
83 | int rc; | |
655bfd7a | 84 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 85 | |
599a52d1 RP |
86 | mutex_lock(&ld->ops_lock); |
87 | if (ld->ops && ld->ops->get_power) | |
88 | rc = sprintf(buf, "%d\n", ld->ops->get_power(ld)); | |
1da177e4 LT |
89 | else |
90 | rc = -ENXIO; | |
599a52d1 | 91 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
92 | |
93 | return rc; | |
94 | } | |
95 | ||
655bfd7a RP |
96 | static ssize_t lcd_store_power(struct device *dev, |
97 | struct device_attribute *attr, const char *buf, size_t count) | |
1da177e4 | 98 | { |
68673afd | 99 | int rc = -ENXIO; |
1da177e4 | 100 | char *endp; |
655bfd7a | 101 | struct lcd_device *ld = to_lcd_device(dev); |
68673afd RP |
102 | int power = simple_strtoul(buf, &endp, 0); |
103 | size_t size = endp - buf; | |
1da177e4 | 104 | |
e7d2860b | 105 | if (isspace(*endp)) |
68673afd RP |
106 | size++; |
107 | if (size != count) | |
1da177e4 LT |
108 | return -EINVAL; |
109 | ||
599a52d1 RP |
110 | mutex_lock(&ld->ops_lock); |
111 | if (ld->ops && ld->ops->set_power) { | |
1da177e4 | 112 | pr_debug("lcd: set power to %d\n", power); |
599a52d1 | 113 | ld->ops->set_power(ld, power); |
1da177e4 | 114 | rc = count; |
68673afd | 115 | } |
599a52d1 | 116 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
117 | |
118 | return rc; | |
119 | } | |
120 | ||
655bfd7a RP |
121 | static ssize_t lcd_show_contrast(struct device *dev, |
122 | struct device_attribute *attr, char *buf) | |
1da177e4 | 123 | { |
68673afd | 124 | int rc = -ENXIO; |
655bfd7a | 125 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 126 | |
599a52d1 RP |
127 | mutex_lock(&ld->ops_lock); |
128 | if (ld->ops && ld->ops->get_contrast) | |
129 | rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld)); | |
130 | mutex_unlock(&ld->ops_lock); | |
1da177e4 LT |
131 | |
132 | return rc; | |
133 | } | |
134 | ||
655bfd7a RP |
135 | static ssize_t lcd_store_contrast(struct device *dev, |
136 | struct device_attribute *attr, const char *buf, size_t count) | |
1da177e4 | 137 | { |
68673afd | 138 | int rc = -ENXIO; |
1da177e4 | 139 | char *endp; |
655bfd7a | 140 | struct lcd_device *ld = to_lcd_device(dev); |
68673afd RP |
141 | int contrast = simple_strtoul(buf, &endp, 0); |
142 | size_t size = endp - buf; | |
1da177e4 | 143 | |
e7d2860b | 144 | if (isspace(*endp)) |
68673afd RP |
145 | size++; |
146 | if (size != count) | |
1da177e4 LT |
147 | return -EINVAL; |
148 | ||
599a52d1 RP |
149 | mutex_lock(&ld->ops_lock); |
150 | if (ld->ops && ld->ops->set_contrast) { | |
1da177e4 | 151 | pr_debug("lcd: set contrast to %d\n", contrast); |
599a52d1 | 152 | ld->ops->set_contrast(ld, contrast); |
1da177e4 | 153 | rc = count; |
68673afd | 154 | } |
599a52d1 | 155 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
156 | |
157 | return rc; | |
158 | } | |
159 | ||
655bfd7a RP |
160 | static ssize_t lcd_show_max_contrast(struct device *dev, |
161 | struct device_attribute *attr, char *buf) | |
1da177e4 | 162 | { |
655bfd7a | 163 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 164 | |
599a52d1 | 165 | return sprintf(buf, "%d\n", ld->props.max_contrast); |
1da177e4 LT |
166 | } |
167 | ||
0ad90efd | 168 | static struct class *lcd_class; |
655bfd7a RP |
169 | |
170 | static void lcd_device_release(struct device *dev) | |
1da177e4 LT |
171 | { |
172 | struct lcd_device *ld = to_lcd_device(dev); | |
173 | kfree(ld); | |
174 | } | |
175 | ||
655bfd7a RP |
176 | static struct device_attribute lcd_device_attributes[] = { |
177 | __ATTR(lcd_power, 0644, lcd_show_power, lcd_store_power), | |
178 | __ATTR(contrast, 0644, lcd_show_contrast, lcd_store_contrast), | |
179 | __ATTR(max_contrast, 0444, lcd_show_max_contrast, NULL), | |
180 | __ATTR_NULL, | |
1da177e4 LT |
181 | }; |
182 | ||
1da177e4 LT |
183 | /** |
184 | * lcd_device_register - register a new object of lcd_device class. | |
185 | * @name: the name of the new object(must be the same as the name of the | |
186 | * respective framebuffer device). | |
655bfd7a RP |
187 | * @devdata: an optional pointer to be stored in the device. The |
188 | * methods may retrieve it by using lcd_get_data(ld). | |
599a52d1 | 189 | * @ops: the lcd operations structure. |
1da177e4 | 190 | * |
655bfd7a | 191 | * Creates and registers a new lcd device. Returns either an ERR_PTR() |
1da177e4 LT |
192 | * or a pointer to the newly allocated device. |
193 | */ | |
655bfd7a RP |
194 | struct lcd_device *lcd_device_register(const char *name, struct device *parent, |
195 | void *devdata, struct lcd_ops *ops) | |
1da177e4 | 196 | { |
1da177e4 | 197 | struct lcd_device *new_ld; |
655bfd7a | 198 | int rc; |
1da177e4 LT |
199 | |
200 | pr_debug("lcd_device_register: name=%s\n", name); | |
201 | ||
599a52d1 | 202 | new_ld = kzalloc(sizeof(struct lcd_device), GFP_KERNEL); |
90968e8e | 203 | if (!new_ld) |
10ad1b73 | 204 | return ERR_PTR(-ENOMEM); |
1da177e4 | 205 | |
599a52d1 | 206 | mutex_init(&new_ld->ops_lock); |
28ee086d | 207 | mutex_init(&new_ld->update_lock); |
1da177e4 | 208 | |
655bfd7a RP |
209 | new_ld->dev.class = lcd_class; |
210 | new_ld->dev.parent = parent; | |
211 | new_ld->dev.release = lcd_device_release; | |
64dba9a9 | 212 | dev_set_name(&new_ld->dev, name); |
655bfd7a RP |
213 | dev_set_drvdata(&new_ld->dev, devdata); |
214 | ||
215 | rc = device_register(&new_ld->dev); | |
90968e8e | 216 | if (rc) { |
2fd5a154 | 217 | kfree(new_ld); |
1da177e4 LT |
218 | return ERR_PTR(rc); |
219 | } | |
220 | ||
3d5eeadd | 221 | rc = lcd_register_fb(new_ld); |
2fd5a154 | 222 | if (rc) { |
655bfd7a | 223 | device_unregister(&new_ld->dev); |
2fd5a154 DT |
224 | return ERR_PTR(rc); |
225 | } | |
1da177e4 | 226 | |
655bfd7a | 227 | new_ld->ops = ops; |
1da177e4 LT |
228 | |
229 | return new_ld; | |
230 | } | |
231 | EXPORT_SYMBOL(lcd_device_register); | |
232 | ||
233 | /** | |
234 | * lcd_device_unregister - unregisters a object of lcd_device class. | |
235 | * @ld: the lcd device object to be unregistered and freed. | |
236 | * | |
237 | * Unregisters a previously registered via lcd_device_register object. | |
238 | */ | |
239 | void lcd_device_unregister(struct lcd_device *ld) | |
240 | { | |
1da177e4 LT |
241 | if (!ld) |
242 | return; | |
243 | ||
599a52d1 RP |
244 | mutex_lock(&ld->ops_lock); |
245 | ld->ops = NULL; | |
246 | mutex_unlock(&ld->ops_lock); | |
3d5eeadd | 247 | lcd_unregister_fb(ld); |
655bfd7a RP |
248 | |
249 | device_unregister(&ld->dev); | |
1da177e4 LT |
250 | } |
251 | EXPORT_SYMBOL(lcd_device_unregister); | |
252 | ||
253 | static void __exit lcd_class_exit(void) | |
254 | { | |
655bfd7a | 255 | class_destroy(lcd_class); |
1da177e4 LT |
256 | } |
257 | ||
258 | static int __init lcd_class_init(void) | |
259 | { | |
655bfd7a RP |
260 | lcd_class = class_create(THIS_MODULE, "lcd"); |
261 | if (IS_ERR(lcd_class)) { | |
262 | printk(KERN_WARNING "Unable to create backlight class; errno = %ld\n", | |
263 | PTR_ERR(lcd_class)); | |
264 | return PTR_ERR(lcd_class); | |
265 | } | |
266 | ||
267 | lcd_class->dev_attrs = lcd_device_attributes; | |
268 | return 0; | |
1da177e4 LT |
269 | } |
270 | ||
271 | /* | |
272 | * if this is compiled into the kernel, we need to ensure that the | |
273 | * class is registered before users of the class try to register lcd's | |
274 | */ | |
275 | postcore_initcall(lcd_class_init); | |
276 | module_exit(lcd_class_exit); | |
277 | ||
278 | MODULE_LICENSE("GPL"); | |
279 | MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>"); | |
280 | MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction"); |