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eeepc-laptop: cpufv updates 

Limit cpufv input to acceptables values.
Add an available_cpufv file to show available
presets.
Change cpufv ouput format from %d to %#x, it won't
break compatibility with existing userspace tools, but
it provide a more human readable output.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Corentin Chary 2009-06-16 19:28:56 +00:00 committed by Len Brown
parent b7b700d4a4
commit b31d0fde89
1 changed files with 76 additions and 1 deletions
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77
drivers/platform/x86/eeepc-laptop.c
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@ -392,13 +392,88 @@ static ssize_t show_sys_acpi(int cm, char *buf)
EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
EEEPC_CREATE_DEVICE_ATTR(cpufv, CM_ASL_CPUFV);
struct eeepc_cpufv {
int num;
int cur;
};
static int get_cpufv(struct eeepc_cpufv *c)
{
c->cur = get_acpi(CM_ASL_CPUFV);
c->num = (c->cur >> 8) & 0xff;
c->cur &= 0xff;
if (c->cur < 0 || c->num <= 0 || c->num > 12)
return -ENODEV;
return 0;
}
static ssize_t show_available_cpufv(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct eeepc_cpufv c;
int i;
ssize_t len = 0;
if (get_cpufv(&c))
return -ENODEV;
for (i = 0; i < c.num; i++)
len += sprintf(buf + len, "%d ", i);
len += sprintf(buf + len, "\n");
return len;
}
static ssize_t show_cpufv(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct eeepc_cpufv c;
if (get_cpufv(&c))
return -ENODEV;
return sprintf(buf, "%#x\n", (c.num << 8) | c.cur);
}
static ssize_t store_cpufv(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct eeepc_cpufv c;
int rv, value;
if (get_cpufv(&c))
return -ENODEV;
rv = parse_arg(buf, count, &value);
if (rv < 0)
return rv;
if (!rv || value < 0 || value >= c.num)
return -EINVAL;
set_acpi(CM_ASL_CPUFV, value);
return rv;
}
static struct device_attribute dev_attr_cpufv = {
.attr = {
.name = "cpufv",
.mode = 0644 },
.show = show_cpufv,
.store = store_cpufv
};
static struct device_attribute dev_attr_available_cpufv = {
.attr = {
.name = "available_cpufv",
.mode = 0444 },
.show = show_available_cpufv
};
static struct attribute *platform_attributes[] = {
&dev_attr_camera.attr,
&dev_attr_cardr.attr,
&dev_attr_disp.attr,
&dev_attr_cpufv.attr,
&dev_attr_available_cpufv.attr,
NULL
};