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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> | |
1da177e4 | 16 | |
3d5eeadd JS |
17 | #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \ |
18 | defined(CONFIG_LCD_CLASS_DEVICE_MODULE)) | |
19 | /* This callback gets called when something important happens inside a | |
20 | * framebuffer driver. We're looking if that important event is blanking, | |
21 | * and if it is, we're switching lcd power as well ... | |
22 | */ | |
23 | static int fb_notifier_callback(struct notifier_block *self, | |
24 | unsigned long event, void *data) | |
25 | { | |
26 | struct lcd_device *ld; | |
27 | struct fb_event *evdata = data; | |
28 | ||
29 | /* If we aren't interested in this event, skip it immediately ... */ | |
30 | if (event != FB_EVENT_BLANK) | |
31 | return 0; | |
32 | ||
33 | ld = container_of(self, struct lcd_device, fb_notif); | |
34 | down(&ld->sem); | |
35 | if (ld->props) | |
36 | if (!ld->props->check_fb || ld->props->check_fb(evdata->info)) | |
37 | ld->props->set_power(ld, *(int *)evdata->data); | |
38 | up(&ld->sem); | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static int lcd_register_fb(struct lcd_device *ld) | |
43 | { | |
44 | memset(&ld->fb_notif, 0, sizeof(&ld->fb_notif)); | |
45 | ld->fb_notif.notifier_call = fb_notifier_callback; | |
46 | return fb_register_client(&ld->fb_notif); | |
47 | } | |
48 | ||
49 | static void lcd_unregister_fb(struct lcd_device *ld) | |
50 | { | |
51 | fb_unregister_client(&ld->fb_notif); | |
52 | } | |
53 | #else | |
54 | static int lcd_register_fb(struct lcd_device *ld) | |
55 | { | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static inline void lcd_unregister_fb(struct lcd_device *ld) | |
60 | { | |
61 | } | |
62 | #endif /* CONFIG_FB */ | |
63 | ||
1da177e4 LT |
64 | static ssize_t lcd_show_power(struct class_device *cdev, char *buf) |
65 | { | |
66 | int rc; | |
67 | struct lcd_device *ld = to_lcd_device(cdev); | |
68 | ||
69 | down(&ld->sem); | |
90968e8e | 70 | if (ld->props && ld->props->get_power) |
1da177e4 LT |
71 | rc = sprintf(buf, "%d\n", ld->props->get_power(ld)); |
72 | else | |
73 | rc = -ENXIO; | |
74 | up(&ld->sem); | |
75 | ||
76 | return rc; | |
77 | } | |
78 | ||
79 | static ssize_t lcd_store_power(struct class_device *cdev, const char *buf, size_t count) | |
80 | { | |
68673afd | 81 | int rc = -ENXIO; |
1da177e4 LT |
82 | char *endp; |
83 | struct lcd_device *ld = to_lcd_device(cdev); | |
68673afd RP |
84 | int power = simple_strtoul(buf, &endp, 0); |
85 | size_t size = endp - buf; | |
1da177e4 | 86 | |
68673afd RP |
87 | if (*endp && isspace(*endp)) |
88 | size++; | |
89 | if (size != count) | |
1da177e4 LT |
90 | return -EINVAL; |
91 | ||
92 | down(&ld->sem); | |
90968e8e | 93 | if (ld->props && ld->props->set_power) { |
1da177e4 LT |
94 | pr_debug("lcd: set power to %d\n", power); |
95 | ld->props->set_power(ld, power); | |
96 | rc = count; | |
68673afd | 97 | } |
1da177e4 LT |
98 | up(&ld->sem); |
99 | ||
100 | return rc; | |
101 | } | |
102 | ||
103 | static ssize_t lcd_show_contrast(struct class_device *cdev, char *buf) | |
104 | { | |
68673afd | 105 | int rc = -ENXIO; |
1da177e4 LT |
106 | struct lcd_device *ld = to_lcd_device(cdev); |
107 | ||
108 | down(&ld->sem); | |
90968e8e | 109 | if (ld->props && ld->props->get_contrast) |
1da177e4 | 110 | rc = sprintf(buf, "%d\n", ld->props->get_contrast(ld)); |
1da177e4 LT |
111 | up(&ld->sem); |
112 | ||
113 | return rc; | |
114 | } | |
115 | ||
116 | static ssize_t lcd_store_contrast(struct class_device *cdev, const char *buf, size_t count) | |
117 | { | |
68673afd | 118 | int rc = -ENXIO; |
1da177e4 LT |
119 | char *endp; |
120 | struct lcd_device *ld = to_lcd_device(cdev); | |
68673afd RP |
121 | int contrast = simple_strtoul(buf, &endp, 0); |
122 | size_t size = endp - buf; | |
1da177e4 | 123 | |
68673afd RP |
124 | if (*endp && isspace(*endp)) |
125 | size++; | |
126 | if (size != count) | |
1da177e4 LT |
127 | return -EINVAL; |
128 | ||
129 | down(&ld->sem); | |
90968e8e | 130 | if (ld->props && ld->props->set_contrast) { |
1da177e4 LT |
131 | pr_debug("lcd: set contrast to %d\n", contrast); |
132 | ld->props->set_contrast(ld, contrast); | |
133 | rc = count; | |
68673afd | 134 | } |
1da177e4 LT |
135 | up(&ld->sem); |
136 | ||
137 | return rc; | |
138 | } | |
139 | ||
140 | static ssize_t lcd_show_max_contrast(struct class_device *cdev, char *buf) | |
141 | { | |
68673afd | 142 | int rc = -ENXIO; |
1da177e4 LT |
143 | struct lcd_device *ld = to_lcd_device(cdev); |
144 | ||
145 | down(&ld->sem); | |
90968e8e | 146 | if (ld->props) |
1da177e4 | 147 | rc = sprintf(buf, "%d\n", ld->props->max_contrast); |
1da177e4 LT |
148 | up(&ld->sem); |
149 | ||
150 | return rc; | |
151 | } | |
152 | ||
153 | static void lcd_class_release(struct class_device *dev) | |
154 | { | |
155 | struct lcd_device *ld = to_lcd_device(dev); | |
156 | kfree(ld); | |
157 | } | |
158 | ||
159 | static struct class lcd_class = { | |
160 | .name = "lcd", | |
161 | .release = lcd_class_release, | |
162 | }; | |
163 | ||
164 | #define DECLARE_ATTR(_name,_mode,_show,_store) \ | |
165 | { \ | |
166 | .attr = { .name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \ | |
167 | .show = _show, \ | |
168 | .store = _store, \ | |
169 | } | |
170 | ||
d95159cf | 171 | static const struct class_device_attribute lcd_class_device_attributes[] = { |
1da177e4 LT |
172 | DECLARE_ATTR(power, 0644, lcd_show_power, lcd_store_power), |
173 | DECLARE_ATTR(contrast, 0644, lcd_show_contrast, lcd_store_contrast), | |
174 | DECLARE_ATTR(max_contrast, 0444, lcd_show_max_contrast, NULL), | |
175 | }; | |
176 | ||
1da177e4 LT |
177 | /** |
178 | * lcd_device_register - register a new object of lcd_device class. | |
179 | * @name: the name of the new object(must be the same as the name of the | |
180 | * respective framebuffer device). | |
181 | * @devdata: an optional pointer to be stored in the class_device. The | |
182 | * methods may retrieve it by using class_get_devdata(ld->class_dev). | |
183 | * @lp: the lcd properties structure. | |
184 | * | |
185 | * Creates and registers a new lcd class_device. Returns either an ERR_PTR() | |
186 | * or a pointer to the newly allocated device. | |
187 | */ | |
188 | struct lcd_device *lcd_device_register(const char *name, void *devdata, | |
189 | struct lcd_properties *lp) | |
190 | { | |
191 | int i, rc; | |
192 | struct lcd_device *new_ld; | |
193 | ||
194 | pr_debug("lcd_device_register: name=%s\n", name); | |
195 | ||
196 | new_ld = kmalloc(sizeof(struct lcd_device), GFP_KERNEL); | |
90968e8e | 197 | if (!new_ld) |
10ad1b73 | 198 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
199 | |
200 | init_MUTEX(&new_ld->sem); | |
201 | new_ld->props = lp; | |
202 | memset(&new_ld->class_dev, 0, sizeof(new_ld->class_dev)); | |
203 | new_ld->class_dev.class = &lcd_class; | |
204 | strlcpy(new_ld->class_dev.class_id, name, KOBJ_NAME_LEN); | |
205 | class_set_devdata(&new_ld->class_dev, devdata); | |
206 | ||
207 | rc = class_device_register(&new_ld->class_dev); | |
90968e8e | 208 | if (rc) { |
2fd5a154 | 209 | kfree(new_ld); |
1da177e4 LT |
210 | return ERR_PTR(rc); |
211 | } | |
212 | ||
3d5eeadd | 213 | rc = lcd_register_fb(new_ld); |
2fd5a154 DT |
214 | if (rc) { |
215 | class_device_unregister(&new_ld->class_dev); | |
216 | return ERR_PTR(rc); | |
217 | } | |
1da177e4 LT |
218 | |
219 | for (i = 0; i < ARRAY_SIZE(lcd_class_device_attributes); i++) { | |
220 | rc = class_device_create_file(&new_ld->class_dev, | |
221 | &lcd_class_device_attributes[i]); | |
90968e8e | 222 | if (rc) { |
1da177e4 LT |
223 | while (--i >= 0) |
224 | class_device_remove_file(&new_ld->class_dev, | |
225 | &lcd_class_device_attributes[i]); | |
226 | class_device_unregister(&new_ld->class_dev); | |
227 | /* No need to kfree(new_ld) since release() method was called */ | |
228 | return ERR_PTR(rc); | |
229 | } | |
230 | } | |
231 | ||
232 | return new_ld; | |
233 | } | |
234 | EXPORT_SYMBOL(lcd_device_register); | |
235 | ||
236 | /** | |
237 | * lcd_device_unregister - unregisters a object of lcd_device class. | |
238 | * @ld: the lcd device object to be unregistered and freed. | |
239 | * | |
240 | * Unregisters a previously registered via lcd_device_register object. | |
241 | */ | |
242 | void lcd_device_unregister(struct lcd_device *ld) | |
243 | { | |
244 | int i; | |
245 | ||
246 | if (!ld) | |
247 | return; | |
248 | ||
249 | pr_debug("lcd_device_unregister: name=%s\n", ld->class_dev.class_id); | |
250 | ||
251 | for (i = 0; i < ARRAY_SIZE(lcd_class_device_attributes); i++) | |
252 | class_device_remove_file(&ld->class_dev, | |
253 | &lcd_class_device_attributes[i]); | |
254 | ||
255 | down(&ld->sem); | |
256 | ld->props = NULL; | |
257 | up(&ld->sem); | |
3d5eeadd | 258 | lcd_unregister_fb(ld); |
1da177e4 LT |
259 | class_device_unregister(&ld->class_dev); |
260 | } | |
261 | EXPORT_SYMBOL(lcd_device_unregister); | |
262 | ||
263 | static void __exit lcd_class_exit(void) | |
264 | { | |
265 | class_unregister(&lcd_class); | |
266 | } | |
267 | ||
268 | static int __init lcd_class_init(void) | |
269 | { | |
270 | return class_register(&lcd_class); | |
271 | } | |
272 | ||
273 | /* | |
274 | * if this is compiled into the kernel, we need to ensure that the | |
275 | * class is registered before users of the class try to register lcd's | |
276 | */ | |
277 | postcore_initcall(lcd_class_init); | |
278 | module_exit(lcd_class_exit); | |
279 | ||
280 | MODULE_LICENSE("GPL"); | |
281 | MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>"); | |
282 | MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction"); |