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 | ||
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 | ||
d79fd03f | 92 | static ssize_t lcd_power_show(struct device *dev, struct device_attribute *attr, |
655bfd7a | 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 | ||
d79fd03f | 108 | static ssize_t lcd_power_store(struct device *dev, |
655bfd7a | 109 | struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 110 | { |
424e06e3 | 111 | int rc; |
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 | |
424e06e3 JH |
119 | rc = -ENXIO; |
120 | ||
599a52d1 RP |
121 | mutex_lock(&ld->ops_lock); |
122 | if (ld->ops && ld->ops->set_power) { | |
35f96162 | 123 | pr_debug("set power to %lu\n", power); |
599a52d1 | 124 | ld->ops->set_power(ld, power); |
1da177e4 | 125 | rc = count; |
68673afd | 126 | } |
599a52d1 | 127 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
128 | |
129 | return rc; | |
130 | } | |
d79fd03f | 131 | static DEVICE_ATTR_RW(lcd_power); |
1da177e4 | 132 | |
d79fd03f | 133 | static ssize_t contrast_show(struct device *dev, |
655bfd7a | 134 | struct device_attribute *attr, char *buf) |
1da177e4 | 135 | { |
68673afd | 136 | int rc = -ENXIO; |
655bfd7a | 137 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 138 | |
599a52d1 RP |
139 | mutex_lock(&ld->ops_lock); |
140 | if (ld->ops && ld->ops->get_contrast) | |
141 | rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld)); | |
142 | mutex_unlock(&ld->ops_lock); | |
1da177e4 LT |
143 | |
144 | return rc; | |
145 | } | |
146 | ||
d79fd03f | 147 | static ssize_t contrast_store(struct device *dev, |
655bfd7a | 148 | struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 149 | { |
424e06e3 | 150 | int rc; |
655bfd7a | 151 | struct lcd_device *ld = to_lcd_device(dev); |
66655760 | 152 | unsigned long contrast; |
1da177e4 | 153 | |
66655760 JH |
154 | rc = kstrtoul(buf, 0, &contrast); |
155 | if (rc) | |
156 | return rc; | |
1da177e4 | 157 | |
424e06e3 JH |
158 | rc = -ENXIO; |
159 | ||
599a52d1 RP |
160 | mutex_lock(&ld->ops_lock); |
161 | if (ld->ops && ld->ops->set_contrast) { | |
35f96162 | 162 | pr_debug("set contrast to %lu\n", contrast); |
599a52d1 | 163 | ld->ops->set_contrast(ld, contrast); |
1da177e4 | 164 | rc = count; |
68673afd | 165 | } |
599a52d1 | 166 | mutex_unlock(&ld->ops_lock); |
1da177e4 LT |
167 | |
168 | return rc; | |
169 | } | |
d79fd03f | 170 | static DEVICE_ATTR_RW(contrast); |
1da177e4 | 171 | |
d79fd03f | 172 | static ssize_t max_contrast_show(struct device *dev, |
655bfd7a | 173 | struct device_attribute *attr, char *buf) |
1da177e4 | 174 | { |
655bfd7a | 175 | struct lcd_device *ld = to_lcd_device(dev); |
1da177e4 | 176 | |
599a52d1 | 177 | return sprintf(buf, "%d\n", ld->props.max_contrast); |
1da177e4 | 178 | } |
d79fd03f | 179 | static DEVICE_ATTR_RO(max_contrast); |
1da177e4 | 180 | |
0ad90efd | 181 | static struct class *lcd_class; |
655bfd7a RP |
182 | |
183 | static void lcd_device_release(struct device *dev) | |
1da177e4 LT |
184 | { |
185 | struct lcd_device *ld = to_lcd_device(dev); | |
186 | kfree(ld); | |
187 | } | |
188 | ||
d79fd03f GKH |
189 | static struct attribute *lcd_device_attrs[] = { |
190 | &dev_attr_lcd_power.attr, | |
191 | &dev_attr_contrast.attr, | |
192 | &dev_attr_max_contrast.attr, | |
193 | NULL, | |
1da177e4 | 194 | }; |
d79fd03f | 195 | ATTRIBUTE_GROUPS(lcd_device); |
1da177e4 | 196 | |
1da177e4 LT |
197 | /** |
198 | * lcd_device_register - register a new object of lcd_device class. | |
199 | * @name: the name of the new object(must be the same as the name of the | |
200 | * respective framebuffer device). | |
655bfd7a RP |
201 | * @devdata: an optional pointer to be stored in the device. The |
202 | * methods may retrieve it by using lcd_get_data(ld). | |
599a52d1 | 203 | * @ops: the lcd operations structure. |
1da177e4 | 204 | * |
655bfd7a | 205 | * Creates and registers a new lcd device. Returns either an ERR_PTR() |
1da177e4 LT |
206 | * or a pointer to the newly allocated device. |
207 | */ | |
655bfd7a RP |
208 | struct lcd_device *lcd_device_register(const char *name, struct device *parent, |
209 | void *devdata, struct lcd_ops *ops) | |
1da177e4 | 210 | { |
1da177e4 | 211 | struct lcd_device *new_ld; |
655bfd7a | 212 | int rc; |
1da177e4 LT |
213 | |
214 | pr_debug("lcd_device_register: name=%s\n", name); | |
215 | ||
599a52d1 | 216 | new_ld = kzalloc(sizeof(struct lcd_device), GFP_KERNEL); |
90968e8e | 217 | if (!new_ld) |
10ad1b73 | 218 | return ERR_PTR(-ENOMEM); |
1da177e4 | 219 | |
599a52d1 | 220 | mutex_init(&new_ld->ops_lock); |
28ee086d | 221 | mutex_init(&new_ld->update_lock); |
1da177e4 | 222 | |
655bfd7a RP |
223 | new_ld->dev.class = lcd_class; |
224 | new_ld->dev.parent = parent; | |
225 | new_ld->dev.release = lcd_device_release; | |
02aa2a37 | 226 | dev_set_name(&new_ld->dev, "%s", name); |
655bfd7a RP |
227 | dev_set_drvdata(&new_ld->dev, devdata); |
228 | ||
229 | rc = device_register(&new_ld->dev); | |
90968e8e | 230 | if (rc) { |
54f5968d | 231 | put_device(&new_ld->dev); |
1da177e4 LT |
232 | return ERR_PTR(rc); |
233 | } | |
234 | ||
3d5eeadd | 235 | rc = lcd_register_fb(new_ld); |
2fd5a154 | 236 | if (rc) { |
655bfd7a | 237 | device_unregister(&new_ld->dev); |
2fd5a154 DT |
238 | return ERR_PTR(rc); |
239 | } | |
1da177e4 | 240 | |
655bfd7a | 241 | new_ld->ops = ops; |
1da177e4 LT |
242 | |
243 | return new_ld; | |
244 | } | |
245 | EXPORT_SYMBOL(lcd_device_register); | |
246 | ||
247 | /** | |
248 | * lcd_device_unregister - unregisters a object of lcd_device class. | |
249 | * @ld: the lcd device object to be unregistered and freed. | |
250 | * | |
251 | * Unregisters a previously registered via lcd_device_register object. | |
252 | */ | |
253 | void lcd_device_unregister(struct lcd_device *ld) | |
254 | { | |
1da177e4 LT |
255 | if (!ld) |
256 | return; | |
257 | ||
599a52d1 RP |
258 | mutex_lock(&ld->ops_lock); |
259 | ld->ops = NULL; | |
260 | mutex_unlock(&ld->ops_lock); | |
3d5eeadd | 261 | lcd_unregister_fb(ld); |
655bfd7a RP |
262 | |
263 | device_unregister(&ld->dev); | |
1da177e4 LT |
264 | } |
265 | EXPORT_SYMBOL(lcd_device_unregister); | |
266 | ||
1d0c48e6 JH |
267 | static void devm_lcd_device_release(struct device *dev, void *res) |
268 | { | |
269 | struct lcd_device *lcd = *(struct lcd_device **)res; | |
270 | ||
271 | lcd_device_unregister(lcd); | |
272 | } | |
273 | ||
274 | static int devm_lcd_device_match(struct device *dev, void *res, void *data) | |
275 | { | |
276 | struct lcd_device **r = res; | |
277 | ||
278 | return *r == data; | |
279 | } | |
280 | ||
281 | /** | |
282 | * devm_lcd_device_register - resource managed lcd_device_register() | |
283 | * @dev: the device to register | |
284 | * @name: the name of the device | |
285 | * @parent: a pointer to the parent device | |
286 | * @devdata: an optional pointer to be stored for private driver use | |
287 | * @ops: the lcd operations structure | |
288 | * | |
289 | * @return a struct lcd on success, or an ERR_PTR on error | |
290 | * | |
291 | * Managed lcd_device_register(). The lcd_device returned from this function | |
292 | * are automatically freed on driver detach. See lcd_device_register() | |
293 | * for more information. | |
294 | */ | |
295 | struct lcd_device *devm_lcd_device_register(struct device *dev, | |
296 | const char *name, struct device *parent, | |
297 | void *devdata, struct lcd_ops *ops) | |
298 | { | |
299 | struct lcd_device **ptr, *lcd; | |
300 | ||
301 | ptr = devres_alloc(devm_lcd_device_release, sizeof(*ptr), GFP_KERNEL); | |
302 | if (!ptr) | |
303 | return ERR_PTR(-ENOMEM); | |
304 | ||
305 | lcd = lcd_device_register(name, parent, devdata, ops); | |
306 | if (!IS_ERR(lcd)) { | |
307 | *ptr = lcd; | |
308 | devres_add(dev, ptr); | |
309 | } else { | |
310 | devres_free(ptr); | |
311 | } | |
312 | ||
313 | return lcd; | |
314 | } | |
315 | EXPORT_SYMBOL(devm_lcd_device_register); | |
316 | ||
317 | /** | |
318 | * devm_lcd_device_unregister - resource managed lcd_device_unregister() | |
319 | * @dev: the device to unregister | |
320 | * @ld: the lcd device to unregister | |
321 | * | |
322 | * Deallocated a lcd allocated with devm_lcd_device_register(). Normally | |
323 | * this function will not need to be called and the resource management | |
324 | * code will ensure that the resource is freed. | |
325 | */ | |
326 | void devm_lcd_device_unregister(struct device *dev, struct lcd_device *ld) | |
327 | { | |
328 | int rc; | |
329 | ||
330 | rc = devres_release(dev, devm_lcd_device_release, | |
331 | devm_lcd_device_match, ld); | |
332 | WARN_ON(rc); | |
333 | } | |
334 | EXPORT_SYMBOL(devm_lcd_device_unregister); | |
335 | ||
336 | ||
1da177e4 LT |
337 | static void __exit lcd_class_exit(void) |
338 | { | |
655bfd7a | 339 | class_destroy(lcd_class); |
1da177e4 LT |
340 | } |
341 | ||
342 | static int __init lcd_class_init(void) | |
343 | { | |
655bfd7a RP |
344 | lcd_class = class_create(THIS_MODULE, "lcd"); |
345 | if (IS_ERR(lcd_class)) { | |
35f96162 JH |
346 | pr_warn("Unable to create backlight class; errno = %ld\n", |
347 | PTR_ERR(lcd_class)); | |
655bfd7a RP |
348 | return PTR_ERR(lcd_class); |
349 | } | |
350 | ||
d79fd03f | 351 | lcd_class->dev_groups = lcd_device_groups; |
655bfd7a | 352 | return 0; |
1da177e4 LT |
353 | } |
354 | ||
355 | /* | |
356 | * if this is compiled into the kernel, we need to ensure that the | |
357 | * class is registered before users of the class try to register lcd's | |
358 | */ | |
359 | postcore_initcall(lcd_class_init); | |
360 | module_exit(lcd_class_exit); | |
361 | ||
362 | MODULE_LICENSE("GPL"); | |
363 | MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>"); | |
364 | MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction"); |