fsi: Add fsi-master class

This change adds a device class for FSI masters, allowing access under
/sys/class/fsi-master/, and easier udev rules.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Alistair Popple <alistair@popple.id.au>
Link: https://lore.kernel.org/r/20191108051945.7109-2-joel@jms.id.au
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 1f76740..0861f60 100644 (file)
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1241,6 +1241,10 @@ static ssize_t master_break_store(struct device *dev,
 
 static DEVICE_ATTR(break, 0200, NULL, master_break_store);
 
+struct class fsi_master_class = {
+       .name = "fsi-master",
+};
+
 int fsi_master_register(struct fsi_master *master)
 {
        int rc;
@@ -1249,6 +1253,7 @@ int fsi_master_register(struct fsi_master *master)
        mutex_init(&master->scan_lock);
        master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
        dev_set_name(&master->dev, "fsi%d", master->idx);
+       master->dev.class = &fsi_master_class;
 
        rc = device_register(&master->dev);
        if (rc) {
@@ -1350,8 +1355,15 @@ static int __init fsi_init(void)
        rc = bus_register(&fsi_bus_type);
        if (rc)
                goto fail_bus;
+
+       rc = class_register(&fsi_master_class);
+       if (rc)
+               goto fail_class;
+
        return 0;
 
+ fail_class:
+       bus_unregister(&fsi_bus_type);
  fail_bus:
        unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES);
        return rc;
@@ -1360,6 +1372,7 @@ postcore_initcall(fsi_init);
 
 static void fsi_exit(void)
 {
+       class_unregister(&fsi_master_class);
        bus_unregister(&fsi_bus_type);
        unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES);
        ida_destroy(&fsi_minor_ida);