linux-kernel - [PATCH v3 WIP 2/3] staging: panel: modify driver to use new parport device model

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Date:	Sat, 25 Apr 2015 18:37:19 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	jdelvare@...e.de
Cc:	linux-kernel@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH v3 WIP 2/3] staging: panel: modify driver to use new parport device model

modify panel driver to use the new parallel port device model.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/staging/panel/panel.c | 63 +++++++++++++++++--------------------------
 1 file changed, 24 insertions(+), 39 deletions(-)

diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
index ea54fb4..0aca810 100644
--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -2188,25 +2188,35 @@ static struct notifier_block panel_notifier = {
 	0
 };
 
-static void panel_attach(struct parport *port)
+static int panel_probe(struct device *dev)
+{
+	if (strcmp(dev_name(dev), "panel"))
+		return -ENODEV;
+
+	return 0;
+}
+
+struct pardev_cb panel_cb = {
+	.flags = 0,	/*PARPORT_DEV_EXCL */
+	.private = &pprt,
+};
+
+static int panel_attach(struct parport *port)
 {
 	if (port->number != parport)
-		return;
+		return -ENODEV;
 
 	if (pprt) {
 		pr_err("%s: port->number=%d parport=%d, already registered!\n",
 		       __func__, port->number, parport);
-		return;
+		return -EAGAIN;
 	}
 
-	pprt = parport_register_device(port, "panel", NULL, NULL,  /* pf, kf */
-				       NULL,
-				       /*PARPORT_DEV_EXCL */
-				       0, (void *)&pprt);
+	pprt = parport_register_dev_model(port, "panel", &panel_cb);
 	if (pprt == NULL) {
 		pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
 		       __func__, port->number, parport);
-		return;
+		return -ENODEV;
 	}
 
 	if (parport_claim(pprt)) {
@@ -2230,7 +2240,7 @@ static void panel_attach(struct parport *port)
 			goto err_lcd_unreg;
 	}
 	register_reboot_notifier(&panel_notifier);
-	return;
+	return 0;
 
 err_lcd_unreg:
 	if (lcd.enabled)
@@ -2238,40 +2248,14 @@ err_lcd_unreg:
 err_unreg_device:
 	parport_unregister_device(pprt);
 	pprt = NULL;
-}
 
-static void panel_detach(struct parport *port)
-{
-	if (port->number != parport)
-		return;
-
-	if (!pprt) {
-		pr_err("%s: port->number=%d parport=%d, nothing to unregister.\n",
-		       __func__, port->number, parport);
-		return;
-	}
-
-	unregister_reboot_notifier(&panel_notifier);
-
-	if (keypad.enabled && keypad_initialized) {
-		misc_deregister(&keypad_dev);
-		keypad_initialized = 0;
-	}
-
-	if (lcd.enabled && lcd.initialized) {
-		misc_deregister(&lcd_dev);
-		lcd.initialized = false;
-	}
-
-	parport_release(pprt);
-	parport_unregister_device(pprt);
-	pprt = NULL;
+	return -ENODEV;
 }
 
 static struct parport_driver panel_driver = {
 	.name = "panel",
-	.attach = panel_attach,
-	.detach = panel_detach,
+	.match_port = panel_attach,
+	.probe = panel_probe,
 };
 
 /* init function */
@@ -2380,7 +2364,7 @@ static int __init panel_init_module(void)
 		return -ENODEV;
 	}
 
-	err = parport_register_driver(&panel_driver);
+	err = parport_register_drv(&panel_driver);
 	if (err) {
 		pr_err("could not register with parport. Aborting.\n");
 		return err;
@@ -2398,6 +2382,7 @@ static int __init panel_init_module(void)
 
 static void __exit panel_cleanup_module(void)
 {
+	unregister_reboot_notifier(&panel_notifier);
 
 	if (scan_timer.function != NULL)
 		del_timer_sync(&scan_timer);
-- 
1.8.1.2

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