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Commit b31d0fde authored by Corentin Chary's avatar Corentin Chary Committed by Len Brown
Browse files

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: default avatarCorentin Chary <corentincj@iksaif.net>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent b7b700d4

drivers/platform/x86/eeepc-laptop.c

+76 −1
Original line number Original line Diff line number Diff line
@@ -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(camera, CM_ASL_CAMERA);

EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);

EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);

EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);

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[] = {

static struct attribute *platform_attributes[] = {

	&dev_attr_camera.attr,

	&dev_attr_camera.attr,

	&dev_attr_cardr.attr,

	&dev_attr_cardr.attr,

	&dev_attr_disp.attr,

	&dev_attr_disp.attr,

	&dev_attr_cpufv.attr,

	&dev_attr_cpufv.attr,

	&dev_attr_available_cpufv.attr,

	NULL

	NULL

};

};