linux-kernel - [PATCH 2/4] parport: update TODO and documentation

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Date:	Wed, 15 Apr 2015 13:18:42 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Jonathan Corbet <corbet@....net>, Jean Delvare <jdelvare@...e.de>,
	Wolfram Sang <wsa@...-dreams.de>,
	Willy Tarreau <willy@...a-x.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	dan.carpenter@...cle.com
Cc:	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org, devel@...verdev.osuosl.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 2/4] parport: update TODO and documentation

as parport starts using the device-model, update the documentation
to show the newly added functions and update TODO with some other
planned modifications.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 Documentation/parport-lowlevel.txt | 49 ++++++++++++++++++++++++++++++++++++++
 drivers/parport/TODO-parport       |  4 ++++
 2 files changed, 53 insertions(+)

diff --git a/Documentation/parport-lowlevel.txt b/Documentation/parport-lowlevel.txt
index 120eb20..4c180af 100644
--- a/Documentation/parport-lowlevel.txt
+++ b/Documentation/parport-lowlevel.txt
@@ -7,9 +7,11 @@ Described here are the following functions:
 
 Global functions:
   parport_register_driver
+  parport_register_drv
   parport_unregister_driver
   parport_enumerate
   parport_register_device
+  parport_register_dev
   parport_unregister_device
   parport_claim
   parport_claim_or_block
@@ -222,6 +224,26 @@ SEE ALSO
 
 parport_unregister_driver, parport_register_device, parport_enumerate
 .
+
+parport_register_drv - register a device driver with parport
+--------------------
+
+Everything is same as parport_register_driver, but it will use the device-model
+and will register the driver under /sys/bus/parport/driver. Just like
+parport_register_driver it will also call the attach callback function but the
+differences being attach wil now return its success or error code and the
+reference of the driver is also passed to the attach so that it can be used
+when calling parport_register_dev.
+
+static int lp_attach (struct parport *port, struct parport_driver *drv)
+{
+	...
+	private = kmalloc (...);
+	dev[count++] = parport_register_dev (...);
+	...
+}
+
+
 parport_unregister_driver - tell parport to forget about this driver
 -------------------------
 
@@ -442,6 +464,33 @@ SEE ALSO
 
 parport_unregister_device, parport_claim
 .
+
+parport_register_dev - register to use a port
+-----------------------
+
+SYNOPSIS
+
+#include <linux/parport.h>
+
+typedef int (*preempt_func) (void *handle);
+typedef void (*wakeup_func) (void *handle);
+typedef int (*irq_func) (int irq, void *handle, struct pt_regs *);
+
+struct pardevice *parport_register_dev(struct parport *port,
+                                          const char *name,
+                                          preempt_func preempt,
+                                          wakeup_func wakeup,
+                                          irq_func irq,
+                                          int flags,
+                                          void *handle,
+					  struct parport_driver *drv);
+
+DESCRIPTION
+
+It is same as parport_register_device, and it should be only used if your
+driver is using the device-model, that is you have registered your driver
+using parport_register_drv.
+
 parport_unregister_device - finish using a port
 -------------------------
 
diff --git a/drivers/parport/TODO-parport b/drivers/parport/TODO-parport
index 089b14e..bdfbf50 100644
--- a/drivers/parport/TODO-parport
+++ b/drivers/parport/TODO-parport
@@ -17,4 +17,8 @@ Things to be done.
 
 4. A better PLIP (make use of bidirectional/ECP/EPP ports).
 
+5. Show base, irq information in the sys tree.
+
+6. Module autoloading based on the connected device.
+
 See <URL:http://people.redhat.com/twaugh/parport/>.
-- 
1.8.1.2

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