This patch creates a sysfs interface (/sys/power/voltage_off_while_idle) to
set or clear a variable which can be used in determining wether voltage
regulators should be shut down in idle.
Signed-off-by: Kalle Jokiniemi <[EMAIL PROTECTED]>
---
arch/arm/mach-omap2/pm.c | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 4652136..05fbb9c 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -33,6 +33,7 @@
unsigned short enable_dyn_sleep;
unsigned short clocks_off_while_idle;
+unsigned short voltage_off_while_idle;
atomic_t sleep_block = ATOMIC_INIT(0);
static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *);
@@ -45,6 +46,9 @@ static struct kobj_attribute sleep_while_idle_attr =
static struct kobj_attribute clocks_off_while_idle_attr =
__ATTR(clocks_off_while_idle, 0644, idle_show, idle_store);
+static struct kobj_attribute voltage_off_while_idle_attr =
+ __ATTR(voltage_off_while_idle, 0644, idle_show, idle_store);
+
static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
@@ -52,6 +56,8 @@ static ssize_t idle_show(struct kobject *kobj, struct
kobj_attribute *attr,
return sprintf(buf, "%hu\n", enable_dyn_sleep);
else if (attr == &clocks_off_while_idle_attr)
return sprintf(buf, "%hu\n", clocks_off_while_idle);
+ else if (attr == &voltage_off_while_idle_attr)
+ return sprintf(buf, "%hu\n", voltage_off_while_idle);
else
return -EINVAL;
}
@@ -71,6 +77,8 @@ static ssize_t idle_store(struct kobject *kobj, struct
kobj_attribute *attr,
enable_dyn_sleep = value;
else if (attr == &clocks_off_while_idle_attr)
clocks_off_while_idle = value;
+ else if (attr == &voltage_off_while_idle_attr)
+ voltage_off_while_idle = value;
else
return -EINVAL;
@@ -113,6 +121,15 @@ static int __init omap_pm_init(void)
if (error)
printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+ voltage_off_while_idle = 0;
+ /* Going to 0V on anything under ES2.1 will eventually cause a crash */
+ if (is_sil_rev_greater_than(OMAP3430_REV_ES2_0)) {
+ error = sysfs_create_file(power_kobj,
+ &voltage_off_while_idle_attr.attr);
+ if (error)
+ printk(KERN_ERR "sysfs_create_file failed: %d\n",
+ error);
+ }
return error;
}
--
1.5.4.3
--
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