diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/303-core-0002-drivers-base-add-sysfs-entries-for-suppliers-and-con.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/303-core-0002-drivers-base-add-sysfs-entries-for-suppliers-and-con.patch | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/303-core-0002-drivers-base-add-sysfs-entries-for-suppliers-and-con.patch b/target/linux/layerscape/patches-5.4/303-core-0002-drivers-base-add-sysfs-entries-for-suppliers-and-con.patch new file mode 100644 index 0000000000..1e45217307 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/303-core-0002-drivers-base-add-sysfs-entries-for-suppliers-and-con.patch @@ -0,0 +1,99 @@ +From 4a84eacedc55e78c8f64a5a4f9ade6e285844b85 Mon Sep 17 00:00:00 2001 +From: Ioana Ciornei <ioana.ciornei@nxp.com> +Date: Mon, 25 Jun 2018 13:19:53 +0300 +Subject: [PATCH] drivers/base: add sysfs entries for suppliers and consumers + +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> +--- + Documentation/ABI/testing/sysfs-devices-links | 13 +++++++++ + drivers/base/core.c | 42 +++++++++++++++++++++++++++ + 2 files changed, 55 insertions(+) + create mode 100644 Documentation/ABI/testing/sysfs-devices-links + +--- /dev/null ++++ b/Documentation/ABI/testing/sysfs-devices-links +@@ -0,0 +1,13 @@ ++What: /sys/devices/.../consumers ++Date: October 2018 ++Contact: Ioana Ciornei <ioana.ciornei@nxp.com> ++Description: ++ Read-only attribute that lists the current "consumers" of ++ a specific device. ++ ++What: /sys/devices/.../suppliers ++Date: October 2018 ++Contact: Ioana Ciornei <ioana.ciornei@nxp.com> ++Description: ++ Read-only attribute that lists the current "suppliers" of ++ a specific device. +--- a/drivers/base/core.c ++++ b/drivers/base/core.c +@@ -1320,6 +1320,34 @@ static ssize_t online_store(struct devic + } + 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); +@@ -1491,8 +1519,20 @@ static int device_add_attrs(struct devic + 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: +@@ -1510,6 +1550,8 @@ static void device_remove_attrs(struct d + 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); + |