When the devfreq cooling device was designed, it was an oversight not to
pass a pointer to the struct devfreq as the first parameters of the
callbacks. The design patterns of the kernel suggest it for a good
reason.
By passing a pointer to struct devfreq, the driver can register one
function that works with multiple devices. With the current
implementation, a driver that can work with multiple devices has to
create multiple copies of the same function with different parameters so
that each devfreq_cooling_device can use the appropriate one. By
passing a pointer to struct devfreq, the driver can identify which
device it's referring to.
Cc: Zhang Rui <rui.zh...@intel.com>
Cc: Eduardo Valentin <edubez...@gmail.com>
Reviewed-by: Punit Agrawal <punit.agra...@arm.com>
Signed-off-by: Javi Merino <javi.mer...@arm.com>
---
drivers/thermal/devfreq_cooling.c | 5 +++--
include/linux/devfreq_cooling.h | 6 ++++--
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/thermal/devfreq_cooling.c
b/drivers/thermal/devfreq_cooling.c
index 01f0015f80dc..c549d83a0c7d 100644
--- a/drivers/thermal/devfreq_cooling.c
+++ b/drivers/thermal/devfreq_cooling.c
@@ -238,7 +238,7 @@ get_static_power(struct devfreq_cooling_device *dfc,
unsigned long freq)
return 0;
}
- return dfc->power_ops->get_static_power(voltage);
+ return dfc->power_ops->get_static_power(df, voltage);
}
/**
@@ -262,7 +262,8 @@ get_dynamic_power(struct devfreq_cooling_device *dfc,
unsigned long freq,
struct devfreq_cooling_power *dfc_power = dfc->power_ops;
if (dfc_power->get_dynamic_power)
- return dfc_power->get_dynamic_power(freq, voltage);
+ return dfc_power->get_dynamic_power(dfc->devfreq, freq,
+ voltage);
freq_mhz = freq / 1000000;
power = (u64)dfc_power->dyn_power_coeff * freq_mhz * voltage * voltage;
diff --git a/include/linux/devfreq_cooling.h b/include/linux/devfreq_cooling.h
index 7adf6cc4b305..959714e93e5b 100644
--- a/include/linux/devfreq_cooling.h
+++ b/include/linux/devfreq_cooling.h
@@ -37,8 +37,10 @@
* @dyn_power_coeff * frequency * voltage^2
*/
struct devfreq_cooling_power {
- unsigned long (*get_static_power)(unsigned long voltage);
- unsigned long (*get_dynamic_power)(unsigned long freq,
+ unsigned long (*get_static_power)(struct devfreq *devfreq,
+ unsigned long voltage);
+ unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
+ unsigned long freq,
unsigned long voltage);
unsigned long dyn_power_coeff;
};
--
1.9.1
