33 	struct linedisp *linedisp = from_timer(linedisp, t, timer);  in linedisp_scroll()  local
34 	unsigned int i, ch = linedisp->scroll_pos;  in linedisp_scroll()
35 	unsigned int num_chars = linedisp->num_chars;  in linedisp_scroll()
40 		for (; i < num_chars && ch < linedisp->message_len; i++, ch++)  in linedisp_scroll()
41 			linedisp->buf[i] = linedisp->message[ch];  in linedisp_scroll()
48 	linedisp->update(linedisp);  in linedisp_scroll()
51 	linedisp->scroll_pos++;  in linedisp_scroll()
52 	linedisp->scroll_pos %= linedisp->message_len;  in linedisp_scroll()
55 	if (linedisp->message_len > num_chars && linedisp->scroll_rate)  in linedisp_scroll()
56 		mod_timer(&linedisp->timer, jiffies + linedisp->scroll_rate);  in linedisp_scroll()
71 static int linedisp_display(struct linedisp *linedisp, const char *msg,  in linedisp_display()  argument
77 	del_timer_sync(&linedisp->timer);  in linedisp_display()
88 		kfree(linedisp->message);  in linedisp_display()
89 		linedisp->message = NULL;  in linedisp_display()
90 		linedisp->message_len = 0;  in linedisp_display()
91 		memset(linedisp->buf, ' ', linedisp->num_chars);  in linedisp_display()
92 		linedisp->update(linedisp);  in linedisp_display()
100 	kfree(linedisp->message);  in linedisp_display()
102 	linedisp->message = new_msg;  in linedisp_display()
103 	linedisp->message_len = count;  in linedisp_display()
104 	linedisp->scroll_pos = 0;  in linedisp_display()
107 	linedisp_scroll(&linedisp->timer);  in linedisp_display()
126 	struct linedisp *linedisp = container_of(dev, struct linedisp, dev);  in message_show()  local
128 	return sysfs_emit(buf, "%s\n", linedisp->message);  in message_show()
145 	struct linedisp *linedisp = container_of(dev, struct linedisp, dev);  in message_store()  local
148 	err = linedisp_display(linedisp, buf, count);  in message_store()
157 	struct linedisp *linedisp = container_of(dev, struct linedisp, dev);  in scroll_step_ms_show()  local
159 	return sysfs_emit(buf, "%u\n", jiffies_to_msecs(linedisp->scroll_rate));  in scroll_step_ms_show()
166 	struct linedisp *linedisp = container_of(dev, struct linedisp, dev);  in scroll_step_ms_store()  local
172 	linedisp->scroll_rate = msecs_to_jiffies(ms);  in scroll_step_ms_store()
173 	if (linedisp->message && linedisp->message_len > linedisp->num_chars) {  in scroll_step_ms_store()
174 		del_timer_sync(&linedisp->timer);  in scroll_step_ms_store()
175 		if (linedisp->scroll_rate)  in scroll_step_ms_store()
176 			linedisp_scroll(&linedisp->timer);  in scroll_step_ms_store()
189 ATTRIBUTE_GROUPS(linedisp);
205 int linedisp_register(struct linedisp *linedisp, struct device *parent,  in linedisp_register()  argument
207 		      void (*update)(struct linedisp *linedisp))  in linedisp_register()  argument
212 	memset(linedisp, 0, sizeof(*linedisp));  in linedisp_register()
213 	linedisp->dev.parent = parent;  in linedisp_register()
214 	linedisp->dev.type = &linedisp_type;  in linedisp_register()
215 	linedisp->update = update;  in linedisp_register()
216 	linedisp->buf = buf;  in linedisp_register()
217 	linedisp->num_chars = num_chars;  in linedisp_register()
218 	linedisp->scroll_rate = DEFAULT_SCROLL_RATE;  in linedisp_register()
220 	device_initialize(&linedisp->dev);  in linedisp_register()
221 	dev_set_name(&linedisp->dev, "linedisp.%lu",  in linedisp_register()
225 	timer_setup(&linedisp->timer, linedisp_scroll, 0);  in linedisp_register()
227 	err = device_add(&linedisp->dev);  in linedisp_register()
232 	err = linedisp_display(linedisp, "Linux " UTS_RELEASE "       ", -1);  in linedisp_register()
239 	device_del(&linedisp->dev);  in linedisp_register()
241 	del_timer_sync(&linedisp->timer);  in linedisp_register()
242 	put_device(&linedisp->dev);  in linedisp_register()
252 void linedisp_unregister(struct linedisp *linedisp)  in linedisp_unregister()  argument
254 	device_del(&linedisp->dev);  in linedisp_unregister()
255 	del_timer_sync(&linedisp->timer);  in linedisp_unregister()
256 	kfree(linedisp->message);  in linedisp_unregister()
257 	put_device(&linedisp->dev);  in linedisp_unregister()