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/*
* drivers/misc/therm_est.c
*
* Copyright (C) 2010-2012 NVIDIA Corporation.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/therm_est.h>
int therm_est_get_temp(struct therm_estimator *est, long *temp)
{
*temp = est->cur_temp;
return 0;
}
int therm_est_set_limits(struct therm_estimator *est,
long lo_limit,
long hi_limit)
{
est->therm_est_lo_limit = lo_limit;
est->therm_est_hi_limit = hi_limit;
return 0;
}
int therm_est_set_alert(struct therm_estimator *est,
void (*cb)(void *),
void *cb_data)
{
if ((!cb) || est->callback)
BUG();
est->callback = cb;
est->callback_data = cb_data;
return 0;
}
static void therm_est_work_func(struct work_struct *work)
{
int i, j, index, sum = 0;
long temp;
struct delayed_work *dwork = container_of (work,
struct delayed_work, work);
struct therm_estimator *est = container_of(
dwork,
struct therm_estimator,
therm_est_work);
for (i = 0; i < est->ndevs; i++) {
if (est->devs[i]->get_temp(est->devs[i]->dev_data, &temp))
continue;
est->devs[i]->hist[(est->ntemp % HIST_LEN)] = temp;
}
for (i = 0; i < est->ndevs; i++) {
for (j = 0; j < HIST_LEN; j++) {
index = (est->ntemp - j + HIST_LEN) % HIST_LEN;
sum += est->devs[i]->hist[index] *
est->devs[i]->coeffs[j];
}
}
est->cur_temp = sum / 100 + est->toffset;
est->ntemp++;
if (est->callback && ((est->cur_temp >= est->therm_est_hi_limit) ||
(est->cur_temp <= est->therm_est_lo_limit)))
est->callback(est->callback_data);
queue_delayed_work(est->workqueue, &est->therm_est_work,
msecs_to_jiffies(est->polling_period));
}
struct therm_estimator *therm_est_register(
struct therm_est_subdevice **devs,
int ndevs,
long toffset,
long polling_period)
{
int i, j;
long temp;
struct therm_estimator *est;
struct therm_est_subdevice *dev;
est = kzalloc(sizeof(struct therm_estimator), GFP_KERNEL);
if (IS_ERR_OR_NULL(est))
return ERR_PTR(-ENOMEM);
est->devs = devs;
est->ndevs = ndevs;
est->toffset = toffset;
est->polling_period = polling_period;
/* initialize history */
for (i = 0; i < ndevs; i++) {
dev = est->devs[i];
if (dev->get_temp(dev->dev_data, &temp)) {
kfree(est);
return ERR_PTR(-EINVAL);
}
for (j = 0; j < HIST_LEN; j++) {
dev->hist[j] = temp;
}
}
est->workqueue = alloc_workqueue("therm_est",
WQ_HIGHPRI | WQ_UNBOUND | WQ_RESCUER, 1);
INIT_DELAYED_WORK(&est->therm_est_work, therm_est_work_func);
queue_delayed_work(est->workqueue,
&est->therm_est_work,
msecs_to_jiffies(est->polling_period));
return est;
}
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