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/*
* colling.c -- cooling methods feature
*
* 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; either version 2, or (at your option) any
* later version.
*
* 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.
*
* Written by Mathieu Bérard <mathieu.berard@crans.org>, 2007
*/
#include "omnibook.h"
#include "hardware.h"
static int omnibook_cooling_read(char *buffer, struct omnibook_operation *io_op)
{
int len = 0;
if(mutex_lock_interruptible(&io_op->backend->mutex))
return -ERESTARTSYS;
len += sprintf(buffer + len, "Cooling method : %s\n",
io_op->backend->cooling_state ? "Performance" : "Powersave" );
mutex_unlock(&io_op->backend->mutex);
return len;
}
static int omnibook_cooling_write(char *buffer, struct omnibook_operation *io_op)
{
int retval = 0;
if(mutex_lock_interruptible(&io_op->backend->mutex))
return -ERESTARTSYS;
if (*buffer == '0') {
retval = __backend_byte_write(io_op,
TSM70_COOLING_OFFSET + TSM70_COOLING_POWERSAVE);
} else if (*buffer == '1') {
retval = __backend_byte_write(io_op,
TSM70_COOLING_OFFSET + TSM70_COOLING_PERF);
} else {
retval = -EINVAL;
goto out;
}
/* *buffer is either '0' or '1' here */
if (!retval)
io_op->backend->cooling_state = *buffer - '0' ;
mutex_unlock(&io_op->backend->mutex);
out:
return retval;
}
static int __init omnibook_cooling_init(struct omnibook_operation *io_op)
{
mutex_lock(&io_op->backend->mutex);
/* XXX: Assumed default cooling method: performance */
io_op->backend->cooling_state = TSM70_COOLING_PERF;
mutex_unlock(&io_op->backend->mutex);
return 0;
}
static void __exit omnibook_cooling_exit(struct omnibook_operation *io_op)
{
/* Set back cooling method to performance */
backend_byte_write(io_op, TSM70_COOLING_OFFSET + TSM70_COOLING_PERF);
}
static struct omnibook_tbl cooling_table[] __initdata = {
{TSM70 | TSX205, {CDI, 0, TSM70_FN_INDEX, 0, 0, 0 }},
{0,}
};
struct omnibook_feature __declared_feature cooling_driver = {
.name = "cooling",
.enabled = 1,
.read = omnibook_cooling_read,
.write = omnibook_cooling_write,
.init = omnibook_cooling_init,
.exit = omnibook_cooling_exit,
.ectypes = TSM70 | TSX205,
.tbl = cooling_table,
};
module_param_named(cooling, cooling_driver.enabled, int, S_IRUGO);
MODULE_PARM_DESC(cooling, "Use 0 to disable, 1 to enable CPU cooling method control");
/* End of file */
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