aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/s3c24xx/patches-2.6.26/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.26/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch')
-rwxr-xr-xtarget/linux/s3c24xx/patches-2.6.26/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch83
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.26/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch b/target/linux/s3c24xx/patches-2.6.26/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch
new file mode 100755
index 0000000000..13945f56b7
--- /dev/null
+++ b/target/linux/s3c24xx/patches-2.6.26/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch
@@ -0,0 +1,83 @@
+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
+