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/*
* throttling.c --CPU throttling control 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"
/*
* Throttling level/rate mapping found in ICH6M datasheets
* the output is set to mimic the one of /proc/acpi/cpu/CPU0/throttling
* XXX: We always assume that there are 8 T-States and one processor.
*/
static const int trate[8] = { 0, 12, 25, 37, 50, 62, 75, 87 };
static int omnibook_throttle_read(char *buffer, struct omnibook_operation *io_op)
{
int len = 0;
int tstate = 0;
int retval, i;
retval = backend_throttle_get(io_op, &tstate);
if (retval < 0)
return retval;
len += sprintf(buffer + len, "state count: 8\n");
len += sprintf(buffer + len, "active state: T%d\n", tstate);
for (i = 0; i < 8; i += 1)
{
len += sprintf(buffer + len, " %cT%d: %02d%%\n",
(i == tstate ? '*' : ' '),
i,
trate[i]);
}
return len;
}
static int omnibook_throttle_write(char *buffer, struct omnibook_operation *io_op)
{
int retval = 0;
int data;
char *endp;
data = simple_strtoul(buffer, &endp, 10);
if ((endp == buffer) || (data > 7)) /* There are 8 throttling levels */
return -EINVAL;
else
retval = backend_throttle_set(io_op, data);
return retval;
}
static struct omnibook_tbl throttle_table[] __initdata = {
{TSM70 | TSX205, {ACPI,}},
{0,}
};
struct omnibook_feature __declared_feature throttle_driver = {
.name = "throttling",
.enabled = 1,
.read = omnibook_throttle_read,
.write = omnibook_throttle_write,
.ectypes = TSM70 | TSX205,
.tbl = throttle_table,
};
module_param_named(throttle, throttle_driver.enabled, int, S_IRUGO);
MODULE_PARM_DESC(throttle, "Use 0 to disable, 1 to enable CPU throttling control");
/* End of file */
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