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/*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/sysedp.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#define STATE_MAX_MW 20000
#define STATE_STEP_MW 500
#define NSTATES (STATE_MAX_MW / STATE_STEP_MW + 1)
inline unsigned int count_state(int mw)
{
int state;
state = mw > 0 ? mw / STATE_STEP_MW + 1 : 0;
return min(state, NSTATES - 1);
}
static void oc_throttle_alarm(struct sysedp_reactive_capping_platform_data *h)
{
mutex_lock(&h->mutex);
h->cur_capping_mw += h->step_alarm_mw;
h->cur_capping_mw = min(h->cur_capping_mw, h->max_capping_mw);
cancel_delayed_work(&h->work);
sysedp_set_state(&h->sysedpc, count_state(h->cur_capping_mw));
schedule_delayed_work(&h->work, msecs_to_jiffies(h->relax_ms));
mutex_unlock(&h->mutex);
}
static void oc_throttle_work(struct work_struct *work)
{
struct sysedp_reactive_capping_platform_data *h;
h = container_of(to_delayed_work(work),
struct sysedp_reactive_capping_platform_data,
work);
mutex_lock(&h->mutex);
h->cur_capping_mw -= h->step_relax_mw;
h->cur_capping_mw = max(h->cur_capping_mw, 0);
sysedp_set_state(&h->sysedpc, count_state(h->cur_capping_mw));
if (h->cur_capping_mw)
schedule_delayed_work(&h->work, msecs_to_jiffies(h->relax_ms));
mutex_unlock(&h->mutex);
}
static irqreturn_t sysedp_reactive_capping_irq_handler(int irq, void *data)
{
if (!data)
return IRQ_NONE;
oc_throttle_alarm(data);
return IRQ_HANDLED;
}
static unsigned int capping_states[NSTATES];
static int sysedp_reactive_capping_probe(struct platform_device *pdev)
{
int ret, i;
struct sysedp_reactive_capping_platform_data *pdata;
pdata = pdev->dev.platform_data;
if (!pdata)
return -EINVAL;
/* update static capping_states table */
for (i = 0; i < NSTATES; i++)
capping_states[i] = i * STATE_STEP_MW;
/* sysedpc consumer name must be initialized */
if (pdata->sysedpc.name[0] == '\0')
return -EINVAL;
pdata->sysedpc.states = capping_states;
pdata->sysedpc.num_states = ARRAY_SIZE(capping_states);
ret = sysedp_register_consumer(&pdata->sysedpc);
if (ret) {
pr_err("sysedp_reactive_capping_probe: consumer register failed (%d)\n",
ret);
return ret;
}
mutex_init(&pdata->mutex);
INIT_DELAYED_WORK(&pdata->work, oc_throttle_work);
ret = request_threaded_irq(pdata->irq,
NULL,
sysedp_reactive_capping_irq_handler,
pdata->irq_flags,
pdata->sysedpc.name,
pdata);
if (ret) {
pr_err("sysedp_reactive_capping_probe: request_threaded_irq failed (%d)\n",
ret);
sysedp_unregister_consumer(&pdata->sysedpc);
return ret;
}
return 0;
}
static struct platform_driver sysedp_reactive_capping_driver = {
.probe = sysedp_reactive_capping_probe,
.driver = {
.name = "sysedp_reactive_capping",
.owner = THIS_MODULE
}
};
static __init int sysedp_reactive_capping_init(void)
{
return platform_driver_register(&sysedp_reactive_capping_driver);
}
late_initcall(sysedp_reactive_capping_init);
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