Messages in this thread Patch in this message | | | From | Ioana Ciornei <> | Subject | [PATCH] drivers/base: add sysfs entries for suppliers and consumers | Date | Thu, 5 Jul 2018 19:00:28 +0300 |
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Instead of scraping dmesg for messages such as 'Linked as a consumer to' or 'Dropping the link to' export two new sysfs entries in the device folder that list the consumer and supplier devices.
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com> --- drivers/base/core.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)
diff --git a/drivers/base/core.c b/drivers/base/core.c index df3e1a4..6d245f7 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1055,6 +1055,34 @@ static ssize_t online_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RW(online); +static ssize_t suppliers_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct device_link *link; + size_t count = 0; + + list_for_each_entry(link, &dev->links.suppliers, c_node) + count += scnprintf(buf + count, PAGE_SIZE - count, "%s\n", + dev_name(link->supplier)); + + return count; +} +static DEVICE_ATTR_RO(suppliers); + +static ssize_t consumers_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct device_link *link; + size_t count = 0; + + list_for_each_entry(link, &dev->links.consumers, s_node) + count += scnprintf(buf + count, PAGE_SIZE - count, "%s\n", + dev_name(link->consumer)); + + return count; +} +static DEVICE_ATTR_RO(consumers); + int device_add_groups(struct device *dev, const struct attribute_group **groups) { return sysfs_create_groups(&dev->kobj, groups); @@ -1226,8 +1254,20 @@ static int device_add_attrs(struct device *dev) goto err_remove_dev_groups; } + error = device_create_file(dev, &dev_attr_suppliers); + if (error) + goto err_remove_online; + + error = device_create_file(dev, &dev_attr_consumers); + if (error) + goto err_remove_suppliers; + return 0; + err_remove_suppliers: + device_remove_file(dev, &dev_attr_suppliers); + err_remove_online: + device_remove_file(dev, &dev_attr_online); err_remove_dev_groups: device_remove_groups(dev, dev->groups); err_remove_type_groups: @@ -1245,6 +1285,8 @@ static void device_remove_attrs(struct device *dev) struct class *class = dev->class; const struct device_type *type = dev->type; + device_remove_file(dev, &dev_attr_consumers); + device_remove_file(dev, &dev_attr_suppliers); device_remove_file(dev, &dev_attr_online); device_remove_groups(dev, dev->groups); -- 1.9.1
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