From 6d75db305b8a964bfec337ca5f3c2cd5047b9bb1 Mon Sep 17 00:00:00 2001 From: Sean Young Date: Fri, 1 Sep 2017 11:30:50 -0300 Subject: [PATCH] [media] media: rc: if protocols can't be changed, don't be writable If the protocols of an rc device cannot be changed, ensure the sysfs file is not writable. This makes it possible to detect this from userspace, so ir-keytable can deal with case without giving an error. Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/rc-main.c | 28 +++++++++++++++++++++------- 1 file changed, 21 insertions(+), 7 deletions(-) diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c index 127f321..42ac349 100644 --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -1487,7 +1487,10 @@ static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env) /* * Static device attribute struct with the sysfs attributes for IR's */ -static DEVICE_ATTR(protocols, 0644, show_protocols, store_protocols); +static struct device_attribute dev_attr_ro_protocols = +__ATTR(protocols, 0444, show_protocols, NULL); +static struct device_attribute dev_attr_rw_protocols = +__ATTR(protocols, 0644, show_protocols, store_protocols); static DEVICE_ATTR(wakeup_protocols, 0644, show_wakeup_protocols, store_wakeup_protocols); static RC_FILTER_ATTR(filter, S_IRUGO|S_IWUSR, @@ -1499,13 +1502,22 @@ static RC_FILTER_ATTR(wakeup_filter, S_IRUGO|S_IWUSR, static RC_FILTER_ATTR(wakeup_filter_mask, S_IRUGO|S_IWUSR, show_filter, store_filter, RC_FILTER_WAKEUP, true); -static struct attribute *rc_dev_protocol_attrs[] = { - &dev_attr_protocols.attr, +static struct attribute *rc_dev_rw_protocol_attrs[] = { + &dev_attr_rw_protocols.attr, NULL, }; -static const struct attribute_group rc_dev_protocol_attr_grp = { - .attrs = rc_dev_protocol_attrs, +static const struct attribute_group rc_dev_rw_protocol_attr_grp = { + .attrs = rc_dev_rw_protocol_attrs, +}; + +static struct attribute *rc_dev_ro_protocol_attrs[] = { + &dev_attr_ro_protocols.attr, + NULL, +}; + +static const struct attribute_group rc_dev_ro_protocol_attr_grp = { + .attrs = rc_dev_ro_protocol_attrs, }; static struct attribute *rc_dev_filter_attrs[] = { @@ -1732,8 +1744,10 @@ int rc_register_device(struct rc_dev *dev) dev_set_drvdata(&dev->dev, dev); dev->dev.groups = dev->sysfs_groups; - if (dev->driver_type != RC_DRIVER_IR_RAW_TX) - dev->sysfs_groups[attr++] = &rc_dev_protocol_attr_grp; + if (dev->driver_type == RC_DRIVER_SCANCODE && !dev->change_protocol) + dev->sysfs_groups[attr++] = &rc_dev_ro_protocol_attr_grp; + else if (dev->driver_type != RC_DRIVER_IR_RAW_TX) + dev->sysfs_groups[attr++] = &rc_dev_rw_protocol_attr_grp; if (dev->s_filter) dev->sysfs_groups[attr++] = &rc_dev_filter_attr_grp; if (dev->s_wakeup_filter) -- 2.7.4