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Date: Wed, 26 Dec 2012 03:29:21 +0000
From: "R, Durgadoss" <durgadoss.r@...el.com>
To: Wei Ni <wni@...dia.com>
CC: "Zhang, Rui" <rui.zhang@...el.com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"hongbo.zhang@...aro.org" <hongbo.zhang@...aro.org>
Subject: RE: [PATCH 8/8] Thermal: Dummy driver used for testing
> -----Original Message-----
> From: Wei Ni [mailto:wni@...dia.com]
> Sent: Tuesday, December 25, 2012 2:08 PM
> To: R, Durgadoss
> Cc: Zhang, Rui; linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org;
> hongbo.zhang@...aro.org
> Subject: Re: [PATCH 8/8] Thermal: Dummy driver used for testing
>
> On 12/18/2012 05:29 PM, Durgadoss R wrote:
> > This patch has a dummy driver that can be used for
> > testing purposes. This patch is not for merge.
> >
> > Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
> > ---
> > drivers/thermal/Kconfig | 5 +
> > drivers/thermal/Makefile | 3 +
> > drivers/thermal/thermal_test.c | 315
> ++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 323 insertions(+)
> > create mode 100644 drivers/thermal/thermal_test.c
> >
> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> > index c5ba3340..3b92a76 100644
> > --- a/drivers/thermal/Kconfig
> > +++ b/drivers/thermal/Kconfig
> > @@ -136,4 +136,9 @@ config DB8500_CPUFREQ_COOLING
> > bound cpufreq cooling device turns active to set CPU frequency low
> to
> > cool down the CPU.
> >
> > +config THERMAL_TEST
> > + tristate "test driver"
> > + help
> > + Enable this to test the thermal framework.
> > +
> > endif
> > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> > index d8da683..02c3edb 100644
> > --- a/drivers/thermal/Makefile
> > +++ b/drivers/thermal/Makefile
> > @@ -18,3 +18,6 @@ obj-$(CONFIG_RCAR_THERMAL) +=
> rcar_thermal.o
> > obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
> > obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
> > obj-$(CONFIG_DB8500_CPUFREQ_COOLING) +=
> db8500_cpufreq_cooling.o
> > +
> > +# dummy driver for testing
> > +obj-$(CONFIG_THERMAL_TEST) += thermal_test.o
> > diff --git a/drivers/thermal/thermal_test.c
> b/drivers/thermal/thermal_test.c
> > new file mode 100644
> > index 0000000..5a11e34
> > --- /dev/null
> > +++ b/drivers/thermal/thermal_test.c
> > @@ -0,0 +1,315 @@
> > +/*
> > + * thermal_test.c - This driver can be used to test Thermal
> > + * Framework changes. Not specific to any
> > + * platform. Fills the log buffer generously ;)
> > + *
> > + * Copyright (C) 2012 Intel Corporation
> > + *
> > + *
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~~~~~~~~~
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; version 2 of the License.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
> the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License
> along
> > + * with this program; if not, write to the Free Software Foundation, Inc.,
> > + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
> > + *
> > + *
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~~~~~~~~~
> > + * Author: Durgadoss R <durgadoss.r@...el.com>
> > + */
> > +
> > +#define pr_fmt(fmt) "thermal_test: " fmt
> > +
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> > +#include <linux/err.h>
> > +#include <linux/param.h>
> > +#include <linux/device.h>
> > +#include <linux/slab.h>
> > +#include <linux/pm.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/thermal.h>
> > +
> > +#define MAX_THERMAL_ZONES 2
> > +#define MAX_THERMAL_SENSORS 2
> > +#define MAX_COOLING_DEVS 4
> > +#define NUM_THRESHOLDS 3
> > +
> > +static struct ts_data {
> > + int curr_temp;
> > + int flag;
> > +} ts_data;
> > +
> > +int active_trips[10] = {100, 90, 80, 70, 60, 50, 40, 30, 20, 10};
> > +int passive_trips[5] = {100, 90, 60, 50, 40};
> > +
> > +static struct platform_device *pdev;
> > +static unsigned long cur_cdev_state = 2;
> > +static struct thermal_sensor *ts, *ts1;
> > +static struct thermal_zone *tz;
> > +static struct thermal_cooling_device *cdev;
> > +
> > +static long thermal_thresholds[NUM_THRESHOLDS] = {30000, 40000,
> 50000};
> > +
> > +static struct thermal_trip_point trip = {
> > + .hot = 90,
> > + .crit = 100,
> > + .num_passive_trips = 5,
> > + .passive_trips = passive_trips,
> > + .num_active_trips = 10,
> > + .active_trips = active_trips,
> > + .active_trip_mask = 0xCFF,
> > +};
> > +
> > +static struct thermal_trip_point trip1 = {
> > + .hot = 95,
> > + .crit = 125,
> > + .num_passive_trips = 0,
> > + .passive_trips = passive_trips,
> > + .num_active_trips = 6,
> > + .active_trips = active_trips,
> > + .active_trip_mask = 0xFF,
> > +};
> > +
> > +static int read_cur_state(struct thermal_cooling_device *cdev,
> > + unsigned long *state)
> > +{
> > + *state = cur_cdev_state;
> > + return 0;
> > +}
> > +
> > +static int write_cur_state(struct thermal_cooling_device *cdev,
> > + unsigned long state)
> > +{
> > + cur_cdev_state = state;
> > + return 0;
> > +}
> > +
> > +static int read_max_state(struct thermal_cooling_device *cdev,
> > + unsigned long *state)
> > +{
> > + *state = 5;
> > + return 0;
> > +}
> > +
> > +static int read_curr_temp(struct thermal_sensor *ts, long *temp)
> > +{
> > + *temp = ts_data.curr_temp;
> > + return 0;
> > +}
> > +
> > +static ssize_t
> > +flag_show(struct device *dev, struct device_attribute *devattr, char
> *buf)
> > +{
> > + return sprintf(buf, "%d\n", ts_data.flag);
> > +}
> > +
> > +static ssize_t
> > +flag_store(struct device *dev, struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + long flag;
> > +
> > + if (kstrtol(buf, 10, &flag))
> > + return -EINVAL;
> > +
> > + ts_data.flag = flag;
> > +
> > + if (flag == 0) {
> > + thermal_sensor_unregister(ts);
> > + ts = NULL;
> > + pr_err("thermal_sensor_unregister (ts) done\n");
> > + } else if (flag == 1) {
> > + thermal_sensor_unregister(ts1);
> > + ts1 = NULL;
> > + pr_err("thermal_sensor_unregister (ts1) done\n");
> > + } else if (flag == 2) {
> > + thermal_cooling_device_unregister(cdev);
> > + cdev = NULL;
> > + pr_err("cdev unregister (cdev) done\n");
> > + } else if (flag == 3) {
> > + if (tz)
> > + remove_thermal_zone(tz);
> > + tz = NULL;
> > + pr_err("removed thermal zone\n");
> > + }
> > +
> > + return count;
> > +}
>
> What does this flag_show()/flag_store() mean?
> I noticed that you didn't call xxx_unregister() in the remove callback.
> Do you mean we need to provide these functions in the platform thermal
> driver? or this is just for test?
At Runtime, I wanted to test register/unregister APIs. That's why I used this
kind of a mechanism. This is _only_ for test.
Thanks,
Durga
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