add scsi_sysfs.c

drivers/scsi/scsi_sysfs.c

+/*
+ * scsi_sysfs.c
+ *
+ * SCSI sysfs interface routines.
+ *
+ * Created to pull SCSI mid layer sysfs routines into one file.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include "scsi.h"
+#include "hosts.h"
+
+/**
+ * scsi_host_class_name_show - copy out the SCSI host name
+ * @dev:		device to check
+ * @page:		copy data into this area
+ * @count:		number of bytes to copy
+ * @off:		start at this offset in page
+ * Return:
+ *     number of bytes written into page.
+ **/
+static ssize_t scsi_host_class_name_show(struct device *dev, char *page,
+	size_t count, loff_t off)
+{
+	struct Scsi_Host *shost;
+
+	if (off)
+		return 0;
+
+	shost = to_scsi_host(dev);
+
+	if (!shost)
+		return 0;
+	
+	return snprintf(page, count, "scsi%d\n", shost->host_no);
+}
+
+DEVICE_ATTR(class_name, S_IRUGO, scsi_host_class_name_show, NULL);
+
+static int scsi_host_class_add_dev(struct device * dev)
+{
+	device_create_file(dev, &dev_attr_class_name);
+	return 0;
+}
+
+static void scsi_host_class_rm_dev(struct device * dev)
+{
+	device_remove_file(dev, &dev_attr_class_name);
+}
+
+struct device_class shost_devclass = {
+	.name		= "scsi-host",
+	.add_device	= scsi_host_class_add_dev,
+	.remove_device	= scsi_host_class_rm_dev,
+};
+
+/**
+ * scsi_bus_match:
+ * @dev:
+ * @dev_driver:
+ *
+ * Return value:
+ **/
+static int scsi_bus_match(struct device *dev, 
+                          struct device_driver *dev_driver)
+{
+        if (!strcmp("sg", dev_driver->name)) {
+                if (strstr(dev->bus_id, ":gen"))
+                        return 1;
+        } else if (!strcmp("st",dev_driver->name)) {
+                if (strstr(dev->bus_id,":mt"))
+                        return 1;
+        } else if (!strcmp("sd", dev_driver->name)) {
+                if ((!strstr(dev->bus_id, ":gen")) && 
+		    (!strstr(dev->bus_id, ":mt"))) { 
+                        return 1;
+                }
+	}
+        return 0;
+}
+
+
+static struct bus_type scsi_bus_type = {
+        .name		= "scsi",
+        .match		= scsi_bus_match,
+};
+
+
+int scsi_sysfs_register(void)
+{
+	bus_register(&scsi_bus_type);
+	devclass_register(&shost_devclass);
+
+	return 0;
+}
+
+void scsi_sysfs_unregister(void)
+{
+	devclass_unregister(&shost_devclass);
+	bus_unregister(&scsi_bus_type);
+}
+
+/**
+ * scsi_upper_driver_register - register upper level driver.
+ * @sdev_tp:	Upper level driver to register with the scsi bus.
+ *
+ * Return value:
+ * 	0 on Success / non-zero on Failure
+ **/
+int scsi_upper_driver_register(struct Scsi_Device_Template *sdev_tp)
+{
+	int error = 0;
+
+	sdev_tp->scsi_driverfs_driver.bus = &scsi_bus_type;
+	error = driver_register(&sdev_tp->scsi_driverfs_driver);
+
+	return error;
+}
+
+/**
+ * scsi_upper_driver_unregister - unregister upper level driver 
+ * @sdev_tp:	Upper level driver to unregister with the scsi bus.
+ *
+ **/
+void scsi_upper_driver_unregister(struct Scsi_Device_Template *sdev_tp)
+{
+	driver_unregister(&sdev_tp->scsi_driverfs_driver);
+}
+
+
+/**
+ * scsi_device_type_read - copy out the SCSI type
+ * @dev:		device to check
+ * @page:		copy data into this area
+ * @count:		number of bytes to copy
+ * @off:		start at this offset in page
+ *
+ * Return:
+ *     number of bytes written into page.
+ **/
+static ssize_t scsi_device_type_read(struct device *dev, char *page,
+	size_t count, loff_t off)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	const char *type;
+
+	if (off)
+		return 0;
+
+	if ((sdev->type > MAX_SCSI_DEVICE_CODE) ||
+	    (scsi_device_types[(int)sdev->type] == NULL))
+		type = "Unknown";
+	else
+		type = scsi_device_types[(int)sdev->type];
+
+	return snprintf(page, count, "%s\n", type);
+}
+
+/*
+ * Create dev_attr_type. This is different from the dev_attr_type in scsi
+ * upper level drivers.
+ */
+static DEVICE_ATTR(type,S_IRUGO,scsi_device_type_read,NULL);
+
+/**
+ * scsi_device_register - register a scsi device with the scsi bus
+ * @sdev:	scsi_device to register
+ *
+ * Return value:
+ * 	0 on Success / non-zero on Failure
+ **/
+int scsi_device_register(struct scsi_device *sdev)
+{
+	int error = 0;
+
+	sprintf(sdev->sdev_driverfs_dev.bus_id,"%d:%d:%d:%d",
+		sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
+	sdev->sdev_driverfs_dev.parent = sdev->host->host_gendev;
+	sdev->sdev_driverfs_dev.bus = &scsi_bus_type;
+
+	error = device_register(&sdev->sdev_driverfs_dev);
+	if (error)
+		return error;
+
+	error = device_create_file(&sdev->sdev_driverfs_dev, &dev_attr_type);
+	if (error)
+		device_unregister(&sdev->sdev_driverfs_dev);
+
+	return error;
+}
+
+/**
+ * scsi_device_unregister - unregister a device from the scsi bus
+ * @sdev:	scsi_device to unregister
+ **/
+void scsi_device_unregister(struct scsi_device *sdev)
+{
+	device_remove_file(&sdev->sdev_driverfs_dev, &dev_attr_type);
+	device_unregister(&sdev->sdev_driverfs_dev);
+}