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Date: Mon, 26 Mar 2007 09:08:54 -0700
From: David Brownell <david-b@...bell.net>
To: Linux Kernel list <linux-kernel@...r.kernel.org>
Cc: akpm@...ux-foundation.org, Jean Delvare <khali@...ux-fr.org>
Subject: [patch 2.6.21-rc5 2/3] legacy PC parports support parport->dev
From: Jean Delvare <khali@...ux-fr.org>
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@...ux-fr.org>
Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
drivers/parport/parport_pc.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
--- linux-2.6.21-pre.orig/drivers/parport/parport_pc.c 2007-02-19 12:03:44.000000000 +0100
+++ linux-2.6.21-pre/drivers/parport/parport_pc.c 2007-02-19 18:15:41.000000000 +0100
@@ -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 (u
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_
};
+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_ini
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);
-
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