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eeepc-laptop: disp attribute should be write-only 

Currently, reading from the disp attribute fails with "No such device",
which is misleading. According to CMSG table on acpi4asus project site,
no models have a getter method corresponding to SDSP. Change the file
permission to disallow reads.

If some joker changes the permission to permit reads, then return -EIO
to be consistent with sysfs' behaviour when no show() method is
provided.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Alan Jenkins 2009-12-03 07:44:45 +00:00 committed by Len Brown
parent 22763c5cf3
commit 6dff29b63a
1 changed files with 7 additions and 7 deletions
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14
drivers/platform/x86/eeepc-laptop.c
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@ -380,7 +380,7 @@ static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
if (rv > 0)
value = set_acpi(cm, value);
if (value < 0)
return value;
return -EIO;
return rv;
}
@ -389,11 +389,11 @@ static ssize_t show_sys_acpi(int cm, char *buf)
int value = get_acpi(cm);
if (value < 0)
return value;
return -EIO;
return sprintf(buf, "%d\n", value);
}
#define EEEPC_CREATE_DEVICE_ATTR(_name, _cm) \
#define EEEPC_CREATE_DEVICE_ATTR(_name, _mode, _cm) \
static ssize_t show_##_name(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
@ -409,14 +409,14 @@ static ssize_t show_sys_acpi(int cm, char *buf)
static struct device_attribute dev_attr_##_name = { \
.attr = { \
.name = __stringify(_name), \
.mode = 0644 }, \
.mode = _mode }, \
.show = show_##_name, \
.store = store_##_name, \
}
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(camera, 0644, CM_ASL_CAMERA);
EEEPC_CREATE_DEVICE_ATTR(cardr, 0644, CM_ASL_CARDREADER);
EEEPC_CREATE_DEVICE_ATTR(disp, 0200, CM_ASL_DISPLAYSWITCH);
struct eeepc_cpufv {
int num;