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
|
/* power.c: Power management driver.
*
* Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/syscalls.h>
#include <asm/system.h>
#include <asm/auxio.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/io.h>
#include <asm/power.h>
#include <asm/sstate.h>
#include <linux/unistd.h>
/*
* sysctl - toggle power-off restriction for serial console
* systems in machine_power_off()
*/
int scons_pwroff = 1;
static void __iomem *power_reg;
static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
static int button_pressed;
void wake_up_powerd(void)
{
if (button_pressed == 0) {
button_pressed = 1;
wake_up(&powerd_wait);
}
}
static irqreturn_t power_handler(int irq, void *dev_id)
{
wake_up_powerd();
/* FIXME: Check registers for status... */
return IRQ_HANDLED;
}
extern void machine_halt(void);
extern void machine_alt_power_off(void);
static void (*poweroff_method)(void) = machine_alt_power_off;
void machine_power_off(void)
{
sstate_poweroff();
if (!serial_console || scons_pwroff) {
if (power_reg) {
/* Both register bits seem to have the
* same effect, so until I figure out
* what the difference is...
*/
writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
} else {
if (poweroff_method != NULL) {
poweroff_method();
/* not reached */
}
}
}
machine_halt();
}
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);
static int powerd(void *__unused)
{
static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
DECLARE_WAITQUEUE(wait, current);
daemonize("powerd");
add_wait_queue(&powerd_wait, &wait);
for (;;) {
set_task_state(current, TASK_INTERRUPTIBLE);
if (button_pressed)
break;
flush_signals(current);
schedule();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&powerd_wait, &wait);
/* Ok, down we go... */
button_pressed = 0;
if (kernel_execve("/sbin/shutdown", argv, envp) < 0) {
printk(KERN_ERR "powerd: shutdown execution failed\n");
machine_power_off();
}
return 0;
}
int start_powerd(void)
{
int err;
err = kernel_thread(powerd, NULL, CLONE_FS);
if (err < 0)
printk(KERN_ERR "power: Failed to start power daemon.\n");
else
printk(KERN_INFO "power: powerd running.\n");
return err;
}
static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
{
if (irq == 0xffffffff)
return 0;
if (!of_find_property(dp, "button", NULL))
return 0;
return 1;
}
static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
{
struct resource *res = &op->resource[0];
unsigned int irq= op->irqs[0];
power_reg = of_ioremap(res, 0, 0x4, "power");
printk("%s: Control reg at %lx ... ",
op->node->name, res->start);
poweroff_method = machine_halt; /* able to use the standard halt */
if (has_button_interrupt(irq, op->node)) {
if (start_powerd() < 0)
return 0;
if (request_irq(irq,
power_handler, 0, "power", NULL) < 0)
printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
} else {
printk(KERN_INFO "power: Not using powerd.\n");
}
return 0;
}
static struct of_device_id power_match[] = {
{
.name = "power",
},
{},
};
static struct of_platform_driver power_driver = {
.name = "power",
.match_table = power_match,
.probe = power_probe,
};
void __init power_init(void)
{
of_register_driver(&power_driver, &of_platform_bus_type);
return;
}
|
