From: Kalle Jokiniemi <ext-kalle.jokiniemi@xxxxxxxxx>
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 <ext-kalle.jokiniemi@xxxxxxxxx>
---
arch/arm/mach-omap2/pm.c | 21 ++++++++++++++++++++-
arch/arm/mach-omap2/pm.h | 1 +
2 files changed, 21 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index c063565..c89de1e 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -36,6 +36,7 @@
unsigned short enable_dyn_sleep;
unsigned short gpio_clocks_off_while_idle;
unsigned short uart_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 *);
@@ -51,6 +52,9 @@ static struct kobj_attribute gpio_clocks_off_while_idle_attr =
static struct kobj_attribute uart_clocks_off_while_idle_attr =
__ATTR(uart_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)
{
@@ -60,6 +64,8 @@ static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
return sprintf(buf, "%hu\n", gpio_clocks_off_while_idle);
else if (attr == &uart_clocks_off_while_idle_attr)
return sprintf(buf, "%hu\n", uart_clocks_off_while_idle);
+ else if (attr == &voltage_off_while_idle_attr)
+ return sprintf(buf, "%hu\n", voltage_off_while_idle);
else
return -EINVAL;
}
@@ -81,6 +87,8 @@ static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
gpio_clocks_off_while_idle = value;
else if (attr == &uart_clocks_off_while_idle_attr)
uart_clocks_off_while_idle = value;
+ else if (attr == &voltage_off_while_idle_attr)
+ voltage_off_while_idle = value;
else
return -EINVAL;
@@ -129,9 +137,20 @@ static int __init omap_pm_init(void)
error = sysfs_create_file(power_kobj,
&gpio_clocks_off_while_idle_attr.attr);
- if (error)
+ if (error) {
printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+ return 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;
}
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 7776cdb..aad4aeb 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -19,6 +19,7 @@ extern int omap3_pm_init(void);
extern unsigned short enable_dyn_sleep;
extern unsigned short gpio_clocks_off_while_idle;
extern unsigned short uart_clocks_off_while_idle;
+extern unsigned short voltage_off_while_idle;
extern atomic_t sleep_block;
extern void omap2_block_sleep(void);
--
1.6.0
--
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