Adds sysfs hooks to control VDD1 and VDD2 OPP's
in the absense of a CPUFreq driver/governor
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
---
arch/arm/mach-omap2/pm.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 67 insertions(+), 1 deletion(-)
Index: linux-omap-2.6/arch/arm/mach-omap2/pm.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/pm.c 2008-11-10 15:24:50.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/pm.c 2008-11-10 15:44:19.000000000 +0530
@@ -24,6 +24,7 @@
#include <linux/suspend.h>
#include <linux/time.h>
#include <linux/platform_device.h>
+#include <linux/device.h>
#include <mach/cpu.h>
#include <asm/mach/time.h>
@@ -32,6 +33,7 @@
#include <mach/pm.h>
#include <mach/powerdomain.h>
#include <mach/omapdev.h>
+#include <mach/resource.h>
#include "prm-regbits-34xx.h"
#include "pm.h"
@@ -58,6 +60,18 @@ static struct kobj_attribute enable_off_
static struct kobj_attribute voltage_off_while_idle_attr =
__ATTR(voltage_off_while_idle, 0644, idle_show, idle_store);
+#ifdef CONFIG_OMAP_PM_SRF
+static struct device dummy_sysfs_dev;
+static ssize_t vdd_opp_show(struct kobject *, struct kobj_attribute *, char *);
+static ssize_t vdd_opp_store(struct kobject *k, struct kobj_attribute *,
+ const char *buf, size_t n);
+static struct kobj_attribute vdd1_opp_attr =
+ __ATTR(vdd1_opp, 0644, vdd_opp_show, vdd_opp_store);
+
+static struct kobj_attribute vdd2_opp_attr =
+ __ATTR(vdd2_opp, 0644, vdd_opp_show, vdd_opp_store);
+#endif
+
static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
@@ -106,6 +120,45 @@ static ssize_t idle_store(struct kobject
return n;
}
+#ifdef CONFIG_OMAP_PM_SRF
+static ssize_t vdd_opp_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ if (attr == &vdd1_opp_attr)
+ return sprintf(buf, "%hu\n", resource_get_level("vdd1_opp"));
+ else if (attr == &vdd2_opp_attr)
+ return sprintf(buf, "%hu\n", resource_get_level("vdd2_opp"));
+ else
+ return -EINVAL;
+}
+
+static ssize_t vdd_opp_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
+{
+ unsigned short value;
+
+ if (sscanf(buf, "%hu", &value) != 1)
+ return -EINVAL;
+
+ if (attr == &vdd1_opp_attr) {
+ if (value < 1 || value > 5) {
+ printk(KERN_ERR "vdd_opp_store: Invalid value\n");
+ return -EINVAL;
+ }
+ resource_request("vdd1_opp", &dummy_sysfs_dev, value);
+ } else if (attr == &vdd2_opp_attr) {
+ if (value < 2 || value > 3) {
+ printk(KERN_ERR "vdd_opp_store: Invalid value\n");
+ return -EINVAL;
+ }
+ resource_request("vdd2_opp", &dummy_sysfs_dev, value);
+ } else {
+ return -EINVAL;
+ }
+ return n;
+}
+#endif
+
void omap2_block_sleep(void)
{
atomic_inc(&sleep_block);
@@ -162,7 +215,20 @@ static int __init omap_pm_init(void)
printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
return error;
}
-
+#ifdef CONFIG_OMAP_PM_SRF
+ error = sysfs_create_file(power_kobj,
+ &vdd1_opp_attr.attr);
+ if (error) {
+ printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+ return error;
+ }
+ error = sysfs_create_file(power_kobj,
+ &vdd2_opp_attr.attr);
+ if (error) {
+ printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+ return error;
+ }
+#endif
voltage_off_while_idle = 0;
/* Going to 0V on anything under ES2.1 will eventually cause a crash */
if (system_rev > OMAP3430_REV_ES2_0) {
--
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