1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/irqmap.c linux-2.6.16.7.new/arch/mips/au1000/mtx-1/irqmap.c
--- linux-2.6.16.7/arch/mips/au1000/mtx-1/irqmap.c 2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/irqmap.c 2006-04-23 11:54:31.000000000 +0200
@@ -64,6 +64,7 @@
{ AU1500_GPIO_202, INTC_INT_LOW_LEVEL, 0 },
{ AU1500_GPIO_203, INTC_INT_LOW_LEVEL, 0 },
{ AU1500_GPIO_205, INTC_INT_LOW_LEVEL, 0 },
+ { AU1500_GPIO_207, INTC_INT_RISE_AND_FALL_EDGE, 0 },
};
int au1xxx_nr_irqs = sizeof(au1xxx_irq_map)/sizeof(au1xxx_irq_map_t);
diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/Makefile linux-2.6.16.7.new/arch/mips/au1000/mtx-1/Makefile
--- linux-2.6.16.7/arch/mips/au1000/mtx-1/Makefile 2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/Makefile 2006-04-23 14:01:36.000000000 +0200
@@ -8,3 +8,4 @@
#
lib-y := init.o board_setup.o irqmap.o
+obj-y := mtx-1_sysbtn.o platform.o
diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c linux-2.6.16.7.new/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c
--- linux-2.6.16.7/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c 2006-04-23 14:01:17.000000000 +0200
@@ -0,0 +1,218 @@
+/*
+ * Driver for the MTX-1 System Button.
+ *
+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
+ * http://www.4g-systems.biz
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Neither Michael Stickel nor 4G Systeme GmbH admit liability nor provide
+ * warranty for any of this software. This material is provided
+ * "AS-IS" and at no charge.
+ *
+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>
+ *
+ * Release 0.01.
+ *
+ * Author: Michael Stickel michael.stickel@4g-systems.biz
+ *
+ *
+ * After the module is loaded there is a device /dev/misc/btn
+ * that can be read. It returns one char '1' if the button
+ * has been pressed an '0' if it has been released.
+ */
+#include <linux/autoconf.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include <asm/uaccess.h>
+
+#include <asm/mach-au1x00/au1000.h>
+
+
+#ifndef FALSE
+# define FALSE (0)
+#endif
+
+#ifndef TRUE
+# define TRUE (!FALSE)
+#endif
+
+
+//---------[ declarations ]-----------------
+
+
+static DECLARE_WAIT_QUEUE_HEAD(mtx1btn_wait_queue);
+static char state_changed;
+static char last_value;
+static char is_inuse;
+
+
+//---------[ Hardware Functions ]-----------------
+
+// The MTX-1 Button is attached to GPIO207.
+#define MTX1_GPIO2_SYSBTN (7)
+#define MTX1_SYSBTN_IRQ (AU1500_GPIO_207)
+
+
+static char mtx1_getbtn (int btnno)
+{
+ if (btnno==0) {
+ return (au_readl(GPIO2_PINSTATE) & (1<<MTX1_GPIO2_SYSBTN)) ? 0 : 1;
+ }
+ return 0;
+}
+
+static void mtx1_initbuttons (void)
+{
+ au_writel (au_readl(GPIO2_DIR) & ~(1<<MTX1_GPIO2_SYSBTN), GPIO2_DIR);
+}
+
+
+//---------[ Interrupt handling ]-----------------
+
+
+static void mtx1_btn_interrupt (int irq, void *private)
+{
+ char value = mtx1_getbtn(0);
+ if (last_value != value)
+ {
+ last_value = value;
+ state_changed = 1;
+ wake_up (&mtx1btn_wait_queue);
+ }
+// kill_fasync(&async_queue, SIGIO, POLL_OUT);
+}
+
+
+static int mtx1_btn_startirq (void)
+{
+ if (!request_irq (MTX1_SYSBTN_IRQ, mtx1_btn_interrupt, 0 /* | SA_INTERRUPT */, "mtx1btn", (void *)&state_changed)) {
+ return 0;
+ }
+ return -1;
+}
+
+static int mtx1_btn_stopirq (void)
+{
+ free_irq(MTX1_SYSBTN_IRQ, (void *)&state_changed);
+ return 0;
+}
+
+
+
+//---------[ File Functions ]-----------------
+
+
+static int mtx1sysbtn_minor = -1;
+
+
+static int mtx1sysbtn_open (struct inode *inode, struct file *file)
+{
+ if (MINOR(inode->i_rdev)!=mtx1sysbtn_minor) return -ENODEV;
+ if (is_inuse) return -EBUSY;
+ is_inuse=1;
+ last_value = mtx1_getbtn(0);
+ state_changed = 0;
+ return 0;
+}
+
+
+static int mtx1sysbtn_release (struct inode *inode, struct file *file) {
+ if (MINOR(inode->i_rdev)==mtx1sysbtn_minor) {
+ is_inuse=0;
+ }
+ return 0;
+}
+
+
+static ssize_t mtx1sysbtn_read (struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+ if (count < 1)
+ return -EINVAL;
+ if (!state_changed)
+ interruptible_sleep_on (&mtx1btn_wait_queue);
+ state_changed = 0;
+ char c = last_value ? '1' : '0'; /* mtx1_getbtn(0) */
+ if(copy_to_user(buf, &c, 1))
+ return -EFAULT;
+ return 1;
+}
+
+
+static unsigned int mtx1sysbtn_poll (struct file *file, poll_table * wait)
+{
+ unsigned int mask = 0;
+
+ poll_wait (file, &mtx1btn_wait_queue, wait);
+
+ if (state_changed) // state changed since last time.
+ mask |= POLLIN | POLLRDNORM;
+
+ return mask;
+}
+
+
+static struct file_operations mtx1sysbtn_fops = {
+ .owner = THIS_MODULE,
+ .read = mtx1sysbtn_read,
+ .poll = mtx1sysbtn_poll,
+ .open = mtx1sysbtn_open,
+ .release = mtx1sysbtn_release
+};
+
+
+static struct miscdevice mtx1sysbtn_miscdev = {
+ MISC_DYNAMIC_MINOR /* SYSBTN_MINOR */ ,
+ "btn",
+ &mtx1sysbtn_fops
+};
+
+
+
+//---------[ Module Functions ]-----------------
+
+
+void __exit exit_mtx1_sysbtn (void)
+{
+ is_inuse = 1;
+ mtx1_btn_stopirq ();
+ misc_deregister(&mtx1sysbtn_miscdev);
+}
+
+
+static int __init init_mtx1_sysbtn (void)
+{
+ printk("MTX-1 System Button driver\n");
+ is_inuse = 1;
+ mtx1_initbuttons ();
+ if (misc_register (&mtx1sysbtn_miscdev) >= 0) {
+ mtx1sysbtn_minor = mtx1sysbtn_miscdev.minor;
+ if (mtx1_btn_startirq () == 0) {
+ is_inuse=0;
+ return 0;
+ }
+ misc_deregister(&mtx1sysbtn_miscdev);
+ }
+ return 1;
+}
+
+module_init(init_mtx1_sysbtn);
+module_exit(exit_mtx1_sysbtn);
+
+MODULE_AUTHOR("Michael Stickel");
+MODULE_DESCRIPTION("Driver for the MTX-1 system button");
+MODULE_LICENSE("GPL");
|
