Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * LCD Lowlevel Control Abstraction | |
3 | * | |
4 | * Copyright (C) 2003,2004 Hewlett-Packard Company | |
5 | * | |
6 | */ | |
7 | ||
35f96162 JH |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/lcd.h> | |
14 | #include <linux/notifier.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/fb.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | |
3d5eeadd JS |
20 | #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \ |
21 | defined(CONFIG_LCD_CLASS_DEVICE_MODULE)) | |
22 | /* This callback gets called when something important happens inside a | |
23 | * framebuffer driver. We're looking if that important event is blanking, | |
24 | * and if it is, we're switching lcd power as well ... | |
25 | */ | |
26 | static int fb_notifier_callback(struct notifier_block *self, | |
27 | unsigned long event, void *data) | |
28 | { | |
29 | struct lcd_device *ld; | |
30 | struct fb_event *evdata = data; | |
31 | ||
32 | /* If we aren't interested in this event, skip it immediately ... */ | |
faa312da EM |
33 | switch (event) { |
34 | case FB_EVENT_BLANK: | |
35 | case FB_EVENT_MODE_CHANGE: | |
36 | case FB_EVENT_MODE_CHANGE_ALL: | |
d54ad83f ID |
37 | case FB_EARLY_EVENT_BLANK: |
38 | case FB_R_EARLY_EVENT_BLANK: | |
faa312da EM |
39 | break; |
40 | default: | |
3d5eeadd | 41 | return 0; |
faa312da | 42 | } |
3d5eeadd JS |
43 | |
44 | ld = container_of(self, struct lcd_device, fb_notif); | |
faa312da EM |
45 | if (!ld->ops) |
46 | return 0; | |
47 | ||
599a52d1 | 48 | mutex_lock(&ld->ops_lock); |
faa312da | 49 | if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) { |
b3b4dc88 BD |
50 | if (event == FB_EVENT_BLANK) { |
51 | if (ld->ops->set_power) | |
52 | ld->ops->set_power(ld, *(int *)evdata->data); | |
d54ad83f ID |
53 | } else if (event == FB_EARLY_EVENT_BLANK) { |
54 | if (ld->ops->early_set_power) | |
55 | ld->ops->early_set_power(ld, | |
56 | *(int *)evdata->data); | |
57 | } else if (event == FB_R_EARLY_EVENT_BLANK) { | |
58 | if (ld->ops->r_early_set_power) | |
59 | ld->ops->r_early_set_power(ld, | |
60 | *(int *)evdata->data); | |
b3b4dc88 BD |
61 | } else { |
62 | if (ld->ops->set_mode) | |
63 | ld->ops->set_mode(ld, evdata->data); | |
64 | } | |
faa312da | 65 | } |
599a52d1 | 66 | mutex_unlock(&ld->ops_lock); |
3d5eeadd JS |
67 | return 0; |
68 | } | |
69 | ||
70 | static int lcd_register_fb(struct lcd_device *ld) | |
71 | { | |
1e0fa6bd | 72 | memset(&ld->fb_notif, 0, sizeof(ld->fb_notif)); |
3d5eeadd JS |
73 | ld->fb_notif.notifier_call = fb_notifier_callback; |
74 | return fb_register_client(&ld->fb_notif); | |
75 | } | |
76 | ||
77 | static void lcd_unregister_fb(struct lcd_device *ld) | |
78 | { | |
79 | fb_unregister_client(&ld->fb_notif); | |
80 | } | |
81 | #else | |
82 | static int lcd_register_fb(struct lcd_device *ld) | |
83 | { | |
84 | return 0; | |
85 | } | |
86 | ||
87 | static inline void lcd_unregister_fb(struct lcd_device *ld) | |
88 | { | |
89 | } | |
90 | #endif /* CONFIG_FB */ | |
91 | ||
655bfd7a RP |
92 | static ssize_t lcd_show_power(struct device *dev, struct device_attribute *attr, |
93 | char *buf) | |
1da177e4 LT |
94 | { |
95 | int rc; | |
655bfd7a | 96 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 97 | |
599a52d1 RP |
98 | mutex_lock(&ld->ops_lock); |
99 | if (ld->ops && ld->ops->get_power) | |
100 | rc = sprintf(buf, "%d\n", ld->ops->get_power(ld)); | |
1da177e4 LT |
101 | else |
102 | rc = -ENXIO; | |
599a52d1 | 103 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
104 | |
105 | return rc; | |
106 | } | |
107 | ||
655bfd7a RP |
108 | static ssize_t lcd_store_power(struct device *dev, |
109 | struct device_attribute *attr, const char *buf, size_t count) | |
1da177e4 | 110 | { |
68673afd | 111 | int rc = -ENXIO; |
655bfd7a | 112 | struct lcd_device *ld = to_lcd_device(dev); |
66655760 | 113 | unsigned long power; |
1da177e4 | 114 | |
66655760 JH |
115 | rc = kstrtoul(buf, 0, &power); |
116 | if (rc) | |
117 | return rc; | |
1da177e4 | 118 | |
599a52d1 RP |
119 | mutex_lock(&ld->ops_lock); |
120 | if (ld->ops && ld->ops->set_power) { | |
35f96162 | 121 | pr_debug("set power to %lu\n", power); |
599a52d1 | 122 | ld->ops->set_power(ld, power); |
1da177e4 | 123 | rc = count; |
68673afd | 124 | } |
599a52d1 | 125 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
126 | |
127 | return rc; | |
128 | } | |
129 | ||
655bfd7a RP |
130 | static ssize_t lcd_show_contrast(struct device *dev, |
131 | struct device_attribute *attr, char *buf) | |
1da177e4 | 132 | { |
68673afd | 133 | int rc = -ENXIO; |
655bfd7a | 134 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 135 | |
599a52d1 RP |
136 | mutex_lock(&ld->ops_lock); |
137 | if (ld->ops && ld->ops->get_contrast) | |
138 | rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld)); | |
139 | mutex_unlock(&ld->ops_lock); | |
1da177e4 LT |
140 | |
141 | return rc; | |
142 | } | |
143 | ||
655bfd7a RP |
144 | static ssize_t lcd_store_contrast(struct device *dev, |
145 | struct device_attribute *attr, const char *buf, size_t count) | |
1da177e4 | 146 | { |
68673afd | 147 | int rc = -ENXIO; |
655bfd7a | 148 | struct lcd_device *ld = to_lcd_device(dev); |
66655760 | 149 | unsigned long contrast; |
1da177e4 | 150 | |
66655760 JH |
151 | rc = kstrtoul(buf, 0, &contrast); |
152 | if (rc) | |
153 | return rc; | |
1da177e4 | 154 | |
599a52d1 RP |
155 | mutex_lock(&ld->ops_lock); |
156 | if (ld->ops && ld->ops->set_contrast) { | |
35f96162 | 157 | pr_debug("set contrast to %lu\n", contrast); |
599a52d1 | 158 | ld->ops->set_contrast(ld, contrast); |
1da177e4 | 159 | rc = count; |
68673afd | 160 | } |
599a52d1 | 161 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
162 | |
163 | return rc; | |
164 | } | |
165 | ||
655bfd7a RP |
166 | static ssize_t lcd_show_max_contrast(struct device *dev, |
167 | struct device_attribute *attr, char *buf) | |
1da177e4 | 168 | { |
655bfd7a | 169 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 170 | |
599a52d1 | 171 | return sprintf(buf, "%d\n", ld->props.max_contrast); |
1da177e4 LT |
172 | } |
173 | ||
0ad90efd | 174 | static struct class *lcd_class; |
655bfd7a RP |
175 | |
176 | static void lcd_device_release(struct device *dev) | |
1da177e4 LT |
177 | { |
178 | struct lcd_device *ld = to_lcd_device(dev); | |
179 | kfree(ld); | |
180 | } | |
181 | ||
655bfd7a RP |
182 | static struct device_attribute lcd_device_attributes[] = { |
183 | __ATTR(lcd_power, 0644, lcd_show_power, lcd_store_power), | |
184 | __ATTR(contrast, 0644, lcd_show_contrast, lcd_store_contrast), | |
185 | __ATTR(max_contrast, 0444, lcd_show_max_contrast, NULL), | |
186 | __ATTR_NULL, | |
1da177e4 LT |
187 | }; |
188 | ||
1da177e4 LT |
189 | /** |
190 | * lcd_device_register - register a new object of lcd_device class. | |
191 | * @name: the name of the new object(must be the same as the name of the | |
192 | * respective framebuffer device). | |
655bfd7a RP |
193 | * @devdata: an optional pointer to be stored in the device. The |
194 | * methods may retrieve it by using lcd_get_data(ld). | |
599a52d1 | 195 | * @ops: the lcd operations structure. |
1da177e4 | 196 | * |
655bfd7a | 197 | * Creates and registers a new lcd device. Returns either an ERR_PTR() |
1da177e4 LT |
198 | * or a pointer to the newly allocated device. |
199 | */ | |
655bfd7a RP |
200 | struct lcd_device *lcd_device_register(const char *name, struct device *parent, |
201 | void *devdata, struct lcd_ops *ops) | |
1da177e4 | 202 | { |
1da177e4 | 203 | struct lcd_device *new_ld; |
655bfd7a | 204 | int rc; |
1da177e4 LT |
205 | |
206 | pr_debug("lcd_device_register: name=%s\n", name); | |
207 | ||
599a52d1 | 208 | new_ld = kzalloc(sizeof(struct lcd_device), GFP_KERNEL); |
90968e8e | 209 | if (!new_ld) |
10ad1b73 | 210 | return ERR_PTR(-ENOMEM); |
1da177e4 | 211 | |
599a52d1 | 212 | mutex_init(&new_ld->ops_lock); |
28ee086d | 213 | mutex_init(&new_ld->update_lock); |
1da177e4 | 214 | |
655bfd7a RP |
215 | new_ld->dev.class = lcd_class; |
216 | new_ld->dev.parent = parent; | |
217 | new_ld->dev.release = lcd_device_release; | |
64dba9a9 | 218 | dev_set_name(&new_ld->dev, name); |
655bfd7a RP |
219 | dev_set_drvdata(&new_ld->dev, devdata); |
220 | ||
221 | rc = device_register(&new_ld->dev); | |
90968e8e | 222 | if (rc) { |
2fd5a154 | 223 | kfree(new_ld); |
1da177e4 LT |
224 | return ERR_PTR(rc); |
225 | } | |
226 | ||
3d5eeadd | 227 | rc = lcd_register_fb(new_ld); |
2fd5a154 | 228 | if (rc) { |
655bfd7a | 229 | device_unregister(&new_ld->dev); |
2fd5a154 DT |
230 | return ERR_PTR(rc); |
231 | } | |
1da177e4 | 232 | |
655bfd7a | 233 | new_ld->ops = ops; |
1da177e4 LT |
234 | |
235 | return new_ld; | |
236 | } | |
237 | EXPORT_SYMBOL(lcd_device_register); | |
238 | ||
239 | /** | |
240 | * lcd_device_unregister - unregisters a object of lcd_device class. | |
241 | * @ld: the lcd device object to be unregistered and freed. | |
242 | * | |
243 | * Unregisters a previously registered via lcd_device_register object. | |
244 | */ | |
245 | void lcd_device_unregister(struct lcd_device *ld) | |
246 | { | |
1da177e4 LT |
247 | if (!ld) |
248 | return; | |
249 | ||
599a52d1 RP |
250 | mutex_lock(&ld->ops_lock); |
251 | ld->ops = NULL; | |
252 | mutex_unlock(&ld->ops_lock); | |
3d5eeadd | 253 | lcd_unregister_fb(ld); |
655bfd7a RP |
254 | |
255 | device_unregister(&ld->dev); | |
1da177e4 LT |
256 | } |
257 | EXPORT_SYMBOL(lcd_device_unregister); | |
258 | ||
259 | static void __exit lcd_class_exit(void) | |
260 | { | |
655bfd7a | 261 | class_destroy(lcd_class); |
1da177e4 LT |
262 | } |
263 | ||
264 | static int __init lcd_class_init(void) | |
265 | { | |
655bfd7a RP |
266 | lcd_class = class_create(THIS_MODULE, "lcd"); |
267 | if (IS_ERR(lcd_class)) { | |
35f96162 JH |
268 | pr_warn("Unable to create backlight class; errno = %ld\n", |
269 | PTR_ERR(lcd_class)); | |
655bfd7a RP |
270 | return PTR_ERR(lcd_class); |
271 | } | |
272 | ||
273 | lcd_class->dev_attrs = lcd_device_attributes; | |
274 | return 0; | |
1da177e4 LT |
275 | } |
276 | ||
277 | /* | |
278 | * if this is compiled into the kernel, we need to ensure that the | |
279 | * class is registered before users of the class try to register lcd's | |
280 | */ | |
281 | postcore_initcall(lcd_class_init); | |
282 | module_exit(lcd_class_exit); | |
283 | ||
284 | MODULE_LICENSE("GPL"); | |
285 | MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>"); | |
286 | MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction"); |