legacy PC parports support parport->dev

Give legacy parallel ports a platform device in the device tree.

This is a quick and dirty implementation; it doesn't actually convert the
legacy parport code to the device driver model (by splitting out probing from
device creation).  But at least parallel port device drivers will finally have
a device to work with.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index c3240a67ef85..02c0d52c9f76 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -53,6 +53,7 @@
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/pnp.h>
+#include <linux/platform_device.h>
 #include <linux/sysctl.h>
 
 #include <asm/io.h>
@@ -2156,6 +2157,17 @@ struct parport *parport_pc_probe_port (unsigned long int base,
         struct resource *base_res;
         struct resource *ECR_res = NULL;
         struct resource *EPP_res = NULL;
+        struct platform_device *pdev = NULL;
+
+        if (!dev) {
+                /* We need a physical device to attach to, but none was
+                 * provided. Create our own. */
+                pdev = platform_device_register_simple("parport_pc",
+                                                       base, NULL, 0);
+                if (IS_ERR(pdev))
+                        return NULL;
+                dev = &pdev->dev;
+        }
 
         ops = kmalloc(sizeof (struct parport_operations), GFP_KERNEL);
         if (!ops)
@@ -2359,6 +2371,8 @@ out3:
 out2:
         kfree (ops);
 out1:
+        if (pdev)
+                platform_device_unregister(pdev);
         return NULL;
 }
 
@@ -3106,6 +3120,21 @@ static struct pnp_driver parport_pc_pnp_driver = {
 };
 
 
+static int __devinit parport_pc_platform_probe(struct platform_device *pdev)
+{
+        /* Always succeed, the actual probing is done in
+         * parport_pc_probe_port(). */
+        return 0;
+}
+
+static struct platform_driver parport_pc_platform_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "parport_pc",
+        },
+        .probe          = parport_pc_platform_probe,
+};
+
 /* This is called by parport_pc_find_nonpci_ports (in asm/parport.h) */
 static int __devinit __attribute__((unused))
 parport_pc_find_isa_ports (int autoirq, int autodma)
@@ -3381,9 +3410,15 @@ __setup("parport_init_mode=",parport_init_mode_setup);
 
 static int __init parport_pc_init(void)
 {
+        int err;
+
         if (parse_parport_params())
                 return -EINVAL;
 
+        err = platform_driver_register(&parport_pc_platform_driver);
+        if (err)
+                return err;
+
         if (io[0]) {
                 int i;
                 /* Only probe the ports we were given. */
@@ -3408,6 +3443,7 @@ static void __exit parport_pc_exit(void)
                 pci_unregister_driver (&parport_pc_pci_driver);
         if (pnp_registered_parport)
                 pnp_unregister_driver (&parport_pc_pnp_driver);
+        platform_driver_unregister(&parport_pc_platform_driver);
 
         spin_lock(&ports_lock);
         while (!list_empty(&ports_list)) {
@@ -3416,6 +3452,9 @@ static void __exit parport_pc_exit(void)
                 priv = list_entry(ports_list.next,
                                   struct parport_pc_private, list);
                 port = priv->port;
+                if (port->dev && port->dev->bus == &platform_bus_type)
+                        platform_device_unregister(
+                                to_platform_device(port->dev));
                 spin_unlock(&ports_lock);
                 parport_pc_unregister_port(port);
                 spin_lock(&ports_lock);