This patch modifies the following sysfs entry of DEVFREQ framework
because the devfreq device using passive governor don't need the same
information of the devfreq device using rest governor.
- polling_interval : passive gov don't use the sampling rate.
- available_governors : passive gov don't be changed on runtime in this version.
- trans_stat : passive governor don't support trans_stat in this version.
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
[linux.amoon: Tested on Odroid U3]
Tested-by: Anand Moon <linux.amoon@xxxxxxxxx>
---
drivers/devfreq/devfreq.c | 31 +++++++++++++++++++++++++------
drivers/devfreq/governor.h | 7 +++++++
drivers/devfreq/governor_passive.c | 1 +
drivers/devfreq/governor_performance.c | 1 +
drivers/devfreq/governor_powersave.c | 1 +
drivers/devfreq/governor_simpleondemand.c | 1 +
drivers/devfreq/governor_userspace.c | 1 +
include/linux/devfreq.h | 2 ++
8 files changed, 39 insertions(+), 6 deletions(-)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 78ea4cdaa82c..18ad956fec93 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -597,7 +597,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
goto err_init;
}
- if (!strncmp(devfreq->governor_name, "passive", 7)) {
+ if (devfreq->governor->type == DEVFREQ_GOV_PASSIVE) {
struct devfreq *parent_devfreq =
((struct devfreq_passive_data *)data)->parent;
@@ -963,13 +963,23 @@ static ssize_t available_governors_show(struct device *d,
struct device_attribute *attr,
char *buf)
{
- struct devfreq_governor *tmp_governor;
+ struct devfreq *devfreq = to_devfreq(d);
ssize_t count = 0;
mutex_lock(&devfreq_list_lock);
- list_for_each_entry(tmp_governor, &devfreq_governor_list, node)
+ if (devfreq->governor->type == DEVFREQ_GOV_PASSIVE) {
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
- "%s ", tmp_governor->name);
+ "%s ", devfreq->governor->name);
+ } else {
+ struct devfreq_governor *tmp_governor;
+
+ list_for_each_entry(tmp_governor, &devfreq_governor_list, node) {
+ if (tmp_governor->type == DEVFREQ_GOV_PASSIVE)
+ continue;
+ count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
+ "%s ", tmp_governor->name);
+ }
+ }
mutex_unlock(&devfreq_list_lock);
/* Truncate the trailing space */
@@ -1006,6 +1016,11 @@ static DEVICE_ATTR_RO(target_freq);
static ssize_t polling_interval_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
+ struct devfreq *df = to_devfreq(dev);
+
+ if (df->governor->type == DEVFREQ_GOV_PASSIVE)
+ return sprintf(buf, "Not Supported.\n");
+
return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms);
}
@@ -1020,6 +1035,9 @@ static ssize_t polling_interval_store(struct device *dev,
if (!df->governor)
return -EINVAL;
+ if (df->governor->type == DEVFREQ_GOV_PASSIVE)
+ return -EINVAL;
+
ret = sscanf(buf, "%u", &value);
if (ret != 1)
return -EINVAL;
@@ -1137,11 +1155,12 @@ static ssize_t trans_stat_show(struct device *dev,
int i, j;
unsigned int max_state = devfreq->profile->max_state;
+ if (max_state == 0 || devfreq->governor->type == DEVFREQ_GOV_PASSIVE)
+ return sprintf(buf, "Not Supported.\n");
+
if (!devfreq->stop_polling &&
devfreq_update_status(devfreq, devfreq->previous_freq))
return 0;
- if (max_state == 0)
- return sprintf(buf, "Not Supported.\n");
len = sprintf(buf, " From : To\n");
len += sprintf(buf + len, " :");
diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
index fad7d6321978..43513a58f5bf 100644
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -18,6 +18,13 @@
#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
+/* Devfreq governor type */
+#define DEVFREQ_GOV_ONDEMAND 0x1
+#define DEVFREQ_GOV_PERFORMANCE 0x2
+#define DEVFREQ_GOV_POWERSAVE 0x3
+#define DEVFREQ_GOV_USERSPACE 0x4
+#define DEVFREQ_GOV_PASSIVE 0x4
+
/* Devfreq events */
#define DEVFREQ_GOV_START 0x1
#define DEVFREQ_GOV_STOP 0x2
diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c
index 7443ae4b92f9..adfdee9a9cd1 100644
--- a/drivers/devfreq/governor_passive.c
+++ b/drivers/devfreq/governor_passive.c
@@ -81,6 +81,7 @@ static int devfreq_passive_event_handler(struct devfreq *devfreq,
static struct devfreq_governor devfreq_passive = {
.name = "passive",
+ .type = DEVFREQ_GOV_PASSIVE,
.get_target_freq = devfreq_passive_get_target_freq,
.event_handler = devfreq_passive_event_handler,
};
diff --git a/drivers/devfreq/governor_performance.c b/drivers/devfreq/governor_performance.c
index c72f942f30a8..594d8ecb13fb 100644
--- a/drivers/devfreq/governor_performance.c
+++ b/drivers/devfreq/governor_performance.c
@@ -43,6 +43,7 @@ static int devfreq_performance_handler(struct devfreq *devfreq,
static struct devfreq_governor devfreq_performance = {
.name = "performance",
+ .type = DEVFREQ_GOV_PERFORMANCE,
.get_target_freq = devfreq_performance_func,
.event_handler = devfreq_performance_handler,
};
diff --git a/drivers/devfreq/governor_powersave.c b/drivers/devfreq/governor_powersave.c
index 0c6bed567e6d..e2817e1f2a31 100644
--- a/drivers/devfreq/governor_powersave.c
+++ b/drivers/devfreq/governor_powersave.c
@@ -40,6 +40,7 @@ static int devfreq_powersave_handler(struct devfreq *devfreq,
static struct devfreq_governor devfreq_powersave = {
.name = "powersave",
+ .type = DEVFREQ_GOV_POWERSAVE,
.get_target_freq = devfreq_powersave_func,
.event_handler = devfreq_powersave_handler,
};
diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
index ae72ba5e78df..b905a535d486 100644
--- a/drivers/devfreq/governor_simpleondemand.c
+++ b/drivers/devfreq/governor_simpleondemand.c
@@ -126,6 +126,7 @@ static int devfreq_simple_ondemand_handler(struct devfreq *devfreq,
static struct devfreq_governor devfreq_simple_ondemand = {
.name = "simple_ondemand",
+ .type = DEVFREQ_GOV_ONDEMAND,
.get_target_freq = devfreq_simple_ondemand_func,
.event_handler = devfreq_simple_ondemand_handler,
};
diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c
index 35de6e83c1fe..c78ab78a5220 100644
--- a/drivers/devfreq/governor_userspace.c
+++ b/drivers/devfreq/governor_userspace.c
@@ -138,6 +138,7 @@ static int devfreq_userspace_handler(struct devfreq *devfreq,
static struct devfreq_governor devfreq_userspace = {
.name = "userspace",
+ .type = DEVFREQ_GOV_USERSPACE,
.get_target_freq = devfreq_userspace_func,
.event_handler = devfreq_userspace_handler,
};
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index cf972befca2b..64a9a0fe3d7e 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -97,6 +97,7 @@ struct devfreq_dev_profile {
* struct devfreq_governor - Devfreq policy governor
* @node: list node - contains registered devfreq governors
* @name: Governor's name
+ * @type: Governor's type
* @get_target_freq: Returns desired operating frequency for the device.
* Basically, get_target_freq will run
* devfreq_dev_profile.get_dev_status() to get the
@@ -114,6 +115,7 @@ struct devfreq_governor {
struct list_head node;
const char name[DEVFREQ_NAME_LEN];
+ const int type;
int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
int (*event_handler)(struct devfreq *devfreq,
unsigned int event, void *data);
--
1.9.1
--
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