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
|
From 835002d2e751c0d35b744ceec5bef726b9778b7b Mon Sep 17 00:00:00 2001
From: mokopatches <mokopatches@openmoko.org>
Date: Fri, 25 Jul 2008 22:21:25 +0100
Subject: [PATCH] fix-pcf50606-LOWBAT-kill-init.patch
---
drivers/i2c/chips/pcf50606.c | 53 ++++++++++++++++++++++++++++++++++++-----
1 files changed, 46 insertions(+), 7 deletions(-)
diff --git a/drivers/i2c/chips/pcf50606.c b/drivers/i2c/chips/pcf50606.c
index b530583..a1c92d3 100644
--- a/drivers/i2c/chips/pcf50606.c
+++ b/drivers/i2c/chips/pcf50606.c
@@ -654,8 +654,20 @@ static void pcf50606_work(struct work_struct *work)
if (pcf->onkey_seconds >=
pcf->pdata->onkey_seconds_required) {
/* Ask init to do 'ctrlaltdel' */
- DEBUGPC("SIGINT(init) ");
- kill_proc(1, SIGINT, 1);
+ /*
+ * currently Linux reacts badly to issuing a
+ * signal to PID #1 before init is started.
+ * What happens is that the next kernel thread
+ * to start, which is the JFFS2 Garbage
+ * collector in our case, gets the signal
+ * instead and proceeds to fail to fork --
+ * which is very bad. Therefore we confirm
+ * PID #1 exists before issuing the signal
+ */
+ if (find_task_by_pid(1)) {
+ kill_proc(1, SIGINT, 1);
+ DEBUGPC("SIGINT(init) ");
+ }
/* FIXME: what to do if userspace doesn't
* shut down? Do we want to force it? */
}
@@ -749,11 +761,38 @@ static void pcf50606_work(struct work_struct *work)
}
/* FIXME: TSCPRES */
if (pcfirq[2] & PCF50606_INT3_LOWBAT) {
- /* Really low battery voltage, we have 8 seconds left */
- DEBUGPC("LOWBAT ");
- apm_queue_event(APM_LOW_BATTERY);
- DEBUGPC("SIGPWR(init) ");
- kill_proc(1, SIGPWR, 1);
+ if (__reg_read(pcf, PCF50606_REG_OOCS) & PCF50606_OOCS_EXTON) {
+ /*
+ * hey no need to freak out, we have some kind of
+ * valid charger power
+ */
+ DEBUGPC("(NO)BAT ");
+ } else {
+ /* Really low battery voltage, we have 8 seconds left */
+ DEBUGPC("LOWBAT ");
+ /*
+ * currently Linux reacts badly to issuing a signal to
+ * PID #1 before init is started. What happens is that
+ * the next kernel thread to start, which is the JFFS2
+ * Garbage collector in our case, gets the signal
+ * instead and proceeds to fail to fork -- which is
+ * very bad. Therefore we confirm PID #1 exists
+ * before issuing SPIGPWR
+ */
+ if (find_task_by_pid(1)) {
+ apm_queue_event(APM_LOW_BATTERY);
+ DEBUGPC("SIGPWR(init) ");
+ kill_proc(1, SIGPWR, 1);
+ } else
+ /*
+ * well, our situation is like this: we do not
+ * have any external power, we have a low
+ * battery and since PID #1 doesn't exist yet,
+ * we are early in the boot, likely before
+ * rootfs mount. We should just call it a day
+ */
+ apm_queue_event(APM_CRITICAL_SUSPEND);
+ }
/* Tell PMU we are taking care of this */
reg_set_bit_mask(pcf, PCF50606_REG_OOCC1,
PCF50606_OOCC1_TOTRST,
--
1.5.6.3
|
