switchtec: Add sysfs attributes to the Switchtec driver
Add a few read-only sysfs attributes which provide some device information
that is exposed from the devices, primarily component and device names and
versions.
These are documented in Documentation/ABI/testing/sysfs-class-switchtec.
Tested-by: Krishna Dhulipala <krishnad@fb.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Stephen Bates <stephen.bates@microsemi.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Wei Zhang <wzhang@fb.com>
Reviewed-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index 0bbe90d..15ff61c 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -486,6 +486,118 @@
mutex_unlock(&stdev->mrpc_mutex);
}
+static ssize_t device_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct switchtec_dev *stdev = to_stdev(dev);
+ u32 ver;
+
+ ver = ioread32(&stdev->mmio_sys_info->device_version);
+
+ return sprintf(buf, "%x\n", ver);
+}
+static DEVICE_ATTR_RO(device_version);
+
+static ssize_t fw_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct switchtec_dev *stdev = to_stdev(dev);
+ u32 ver;
+
+ ver = ioread32(&stdev->mmio_sys_info->firmware_version);
+
+ return sprintf(buf, "%08x\n", ver);
+}
+static DEVICE_ATTR_RO(fw_version);
+
+static ssize_t io_string_show(char *buf, void __iomem *attr, size_t len)
+{
+ int i;
+
+ memcpy_fromio(buf, attr, len);
+ buf[len] = '\n';
+ buf[len + 1] = 0;
+
+ for (i = len - 1; i > 0; i--) {
+ if (buf[i] != ' ')
+ break;
+ buf[i] = '\n';
+ buf[i + 1] = 0;
+ }
+
+ return strlen(buf);
+}
+
+#define DEVICE_ATTR_SYS_INFO_STR(field) \
+static ssize_t field ## _show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct switchtec_dev *stdev = to_stdev(dev); \
+ return io_string_show(buf, &stdev->mmio_sys_info->field, \
+ sizeof(stdev->mmio_sys_info->field)); \
+} \
+\
+static DEVICE_ATTR_RO(field)
+
+DEVICE_ATTR_SYS_INFO_STR(vendor_id);
+DEVICE_ATTR_SYS_INFO_STR(product_id);
+DEVICE_ATTR_SYS_INFO_STR(product_revision);
+DEVICE_ATTR_SYS_INFO_STR(component_vendor);
+
+static ssize_t component_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct switchtec_dev *stdev = to_stdev(dev);
+ int id = ioread16(&stdev->mmio_sys_info->component_id);
+
+ return sprintf(buf, "PM%04X\n", id);
+}
+static DEVICE_ATTR_RO(component_id);
+
+static ssize_t component_revision_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct switchtec_dev *stdev = to_stdev(dev);
+ int rev = ioread8(&stdev->mmio_sys_info->component_revision);
+
+ return sprintf(buf, "%d\n", rev);
+}
+static DEVICE_ATTR_RO(component_revision);
+
+static ssize_t partition_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct switchtec_dev *stdev = to_stdev(dev);
+
+ return sprintf(buf, "%d\n", stdev->partition);
+}
+static DEVICE_ATTR_RO(partition);
+
+static ssize_t partition_count_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct switchtec_dev *stdev = to_stdev(dev);
+
+ return sprintf(buf, "%d\n", stdev->partition_count);
+}
+static DEVICE_ATTR_RO(partition_count);
+
+static struct attribute *switchtec_device_attrs[] = {
+ &dev_attr_device_version.attr,
+ &dev_attr_fw_version.attr,
+ &dev_attr_vendor_id.attr,
+ &dev_attr_product_id.attr,
+ &dev_attr_product_revision.attr,
+ &dev_attr_component_vendor.attr,
+ &dev_attr_component_id.attr,
+ &dev_attr_component_revision.attr,
+ &dev_attr_partition.attr,
+ &dev_attr_partition_count.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(switchtec_device);
+
static int switchtec_dev_open(struct inode *inode, struct file *filp)
{
struct switchtec_dev *stdev;
@@ -734,6 +846,7 @@
device_initialize(dev);
dev->class = switchtec_class;
dev->parent = &pdev->dev;
+ dev->groups = switchtec_device_groups;
dev->release = stdev_release;
minor = ida_simple_get(&switchtec_minor_ida, 0, 0,