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Subject[PATCH v2 3/4] switchtec: Add sysfs attributes to the Switchtec driver
This patch adds 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.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Stephen Bates <stephen.bates@microsemi.com>
---
Documentation/ABI/testing/sysfs-class-switchtec | 96 ++++++++++++++++++++
MAINTAINERS | 1 +
drivers/pci/switch/switchtec.c | 113 ++++++++++++++++++++++++
3 files changed, 210 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-class-switchtec

diff --git a/Documentation/ABI/testing/sysfs-class-switchtec b/Documentation/ABI/testing/sysfs-class-switchtec
new file mode 100644
index 0000000..48cb4c1
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-switchtec
@@ -0,0 +1,96 @@
+switchtec - Microsemi Switchtec PCI Switch Management Endpoint
+
+For details on this subsystem look at Documentation/switchtec.txt.
+
+What: /sys/class/switchtec
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: The switchtec class subsystem folder.
+ Each registered switchtec driver is represented by a switchtecX
+ subfolder (X being an integer >= 0).
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/component_id
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Component identifier as stored in the hardware (eg. PM8543)
+ (read only)
+Values: arbitrary string.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/component_revision
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Component revision stored in the hardware (read only)
+Values: integer.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/component_vendor
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Component vendor as stored in the hardware (eg. MICROSEM)
+ (read only)
+Values: arbitrary string.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/device_version
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Device version as stored in the hardware (read only)
+Values: integer.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/fw_version
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Currently running firmware version (read only)
+Values: integer (in hexadecimal).
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/partition
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Partition number for this device in the switch (read only)
+Values: integer.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/partition_count
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Total number of partitions in the switch (read only)
+Values: integer.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/product_id
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Product identifier as stored in the hardware (eg. PSX 48XG3)
+ (read only)
+Values: arbitrary string.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/product_revision
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Product revision stored in the hardware (eg. RevB)
+ (read only)
+Values: arbitrary string.
+
+
+What: /sys/class/switchtec/switchtec[0-9]+/product_vendor
+Date: 05-Jan-2017
+KernelVersion: v4.11
+Contact: Logan Gunthorpe <logang@deltatee.com>
+Description: Product vendor as stored in the hardware (eg. MICROSEM)
+ (read only)
+Values: arbitrary string.
diff --git a/MAINTAINERS b/MAINTAINERS
index 0ab858d..d39b7fd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9514,6 +9514,7 @@ M: Logan Gunthorpe <logang@deltatee.com>
L: linux-pci@vger.kernel.org
S: Maintained
F: Documentation/switchtec.txt
+F: Documentation/ABI/testing/sysfs-class-switchtec
F: drivers/pci/switch/switchtec*

PCI DRIVER FOR NVIDIA TEGRA
diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index e4a4294..354ddfd 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -485,6 +485,118 @@ static void mrpc_timeout_work(struct work_struct *work)
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;
@@ -699,6 +811,7 @@ static struct switchtec_dev *stdev_create(struct pci_dev *pdev)
dev->devt = MKDEV(MAJOR(switchtec_devt), minor);
dev->class = switchtec_class;
dev->parent = &pdev->dev;
+ dev->groups = switchtec_device_groups;
dev->release = stdev_release;
dev_set_name(dev, "switchtec%d", minor);

--
2.1.4
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