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100 lines
3.0 KiB
Diff
100 lines
3.0 KiB
Diff
From 4a84eacedc55e78c8f64a5a4f9ade6e285844b85 Mon Sep 17 00:00:00 2001
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From: Ioana Ciornei <ioana.ciornei@nxp.com>
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Date: Mon, 25 Jun 2018 13:19:53 +0300
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Subject: [PATCH] drivers/base: add sysfs entries for suppliers and consumers
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Instead of scraping dmesg for messages such as 'Linked as a consumer to'
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or 'Dropping the link to' export two new sysfs entries in the device
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folder that list the consumer and supplier devices.
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Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
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---
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Documentation/ABI/testing/sysfs-devices-links | 13 +++++++++
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drivers/base/core.c | 42 +++++++++++++++++++++++++++
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2 files changed, 55 insertions(+)
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create mode 100644 Documentation/ABI/testing/sysfs-devices-links
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--- /dev/null
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+++ b/Documentation/ABI/testing/sysfs-devices-links
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@@ -0,0 +1,13 @@
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+What: /sys/devices/.../consumers
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+Date: October 2018
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+Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
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+Description:
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+ Read-only attribute that lists the current "consumers" of
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+ a specific device.
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+
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+What: /sys/devices/.../suppliers
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+Date: October 2018
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+Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
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+Description:
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+ Read-only attribute that lists the current "suppliers" of
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+ a specific device.
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--- a/drivers/base/core.c
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+++ b/drivers/base/core.c
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@@ -1320,6 +1320,34 @@ static ssize_t online_store(struct devic
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}
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static DEVICE_ATTR_RW(online);
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+static ssize_t suppliers_show(struct device *dev, struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct device_link *link;
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+ size_t count = 0;
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+
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+ list_for_each_entry(link, &dev->links.suppliers, c_node)
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+ count += scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
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+ dev_name(link->supplier));
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+
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+ return count;
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+}
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+static DEVICE_ATTR_RO(suppliers);
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+
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+static ssize_t consumers_show(struct device *dev, struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct device_link *link;
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+ size_t count = 0;
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+
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+ list_for_each_entry(link, &dev->links.consumers, s_node)
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+ count += scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
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+ dev_name(link->consumer));
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+
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+ return count;
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+}
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+static DEVICE_ATTR_RO(consumers);
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+
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int device_add_groups(struct device *dev, const struct attribute_group **groups)
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{
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return sysfs_create_groups(&dev->kobj, groups);
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@@ -1491,8 +1519,20 @@ static int device_add_attrs(struct devic
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goto err_remove_dev_groups;
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}
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+ error = device_create_file(dev, &dev_attr_suppliers);
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+ if (error)
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+ goto err_remove_online;
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+
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+ error = device_create_file(dev, &dev_attr_consumers);
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+ if (error)
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+ goto err_remove_suppliers;
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+
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return 0;
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+ err_remove_suppliers:
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+ device_remove_file(dev, &dev_attr_suppliers);
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+ err_remove_online:
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+ device_remove_file(dev, &dev_attr_online);
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err_remove_dev_groups:
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device_remove_groups(dev, dev->groups);
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err_remove_type_groups:
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@@ -1510,6 +1550,8 @@ static void device_remove_attrs(struct d
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struct class *class = dev->class;
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const struct device_type *type = dev->type;
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+ device_remove_file(dev, &dev_attr_consumers);
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+ device_remove_file(dev, &dev_attr_suppliers);
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device_remove_file(dev, &dev_attr_online);
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device_remove_groups(dev, dev->groups);
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