Date:	Tue,  9 Sep 2008 00:05:50 -0400
From:	Jarod Wilson <jwilson@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jarod Wilson <jwilson@...hat.com>, Jarod Wilson <jarod@...hat.com>,
	Janne Grunau <j@...nua.net>,
	Christoph Bartelmus <lirc@...telmus.de>
Subject: [PATCH 05/18] lirc driver for i2c-based IR receivers

Successfully tested with the IR interface on a Hauppauge PVR-250 and
the flimsly little grey remote that shipped with it.

Signed-off-by: Jarod Wilson <jarod@...hat.com>
Signed-off-by: Janne Grunau <j@...nua.net>
CC: Christoph Bartelmus <lirc@...telmus.de>
Tested-by: Jarod Wilson <jarod@...hat.com>
---
 drivers/input/lirc/Kconfig    |    8 +
 drivers/input/lirc/Makefile   |    1 +
 drivers/input/lirc/lirc_i2c.c |  639 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 648 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/lirc/lirc_i2c.c

diff --git a/drivers/input/lirc/Kconfig b/drivers/input/lirc/Kconfig
index 0a0b059..ba30d2e 100644
--- a/drivers/input/lirc/Kconfig
+++ b/drivers/input/lirc/Kconfig
@@ -18,6 +18,14 @@ config LIRC_DEV
 	help
 	  LIRC device loadable module support, required for most LIRC drivers
 
+config LIRC_I2C
+	tristate "I2C Based IR Receivers"
+	default n
+	depends on LIRC_DEV
+	help
+	  Driver for I2C-based IR receivers, such as those commonly
+	  found onboard Hauppauge PVR-150/250/350 video capture cards
+
 config LIRC_MCEUSB
 	tristate "Microsoft Media Center Ed. Receiver, v1"
 	default n
diff --git a/drivers/input/lirc/Makefile b/drivers/input/lirc/Makefile
index f6accb9..99765d9 100644
--- a/drivers/input/lirc/Makefile
+++ b/drivers/input/lirc/Makefile
@@ -6,6 +6,7 @@
 EXTRA_CFLAGS =-DIRCTL_DEV_MAJOR=61 -DLIRC_SERIAL_TRANSMITTER -I$(src)
 
 obj-$(CONFIG_LIRC_DEV)		+= lirc_dev.o
+obj-$(CONFIG_LIRC_I2C)		+= lirc_i2c.o
 obj-$(CONFIG_LIRC_MCEUSB)	+= lirc_mceusb.o
 obj-$(CONFIG_LIRC_MCEUSB2)	+= lirc_mceusb2.o
 obj-$(CONFIG_LIRC_SERIAL)	+= lirc_serial.o
diff --git a/drivers/input/lirc/lirc_i2c.c b/drivers/input/lirc/lirc_i2c.c
new file mode 100644
index 0000000..4714641
--- /dev/null
+++ b/drivers/input/lirc/lirc_i2c.c
@@ -0,0 +1,639 @@
+/*
+ * i2c IR lirc plugin for Hauppauge and Pixelview cards - new 2.3.x i2c stack
+ *
+ * Copyright (c) 2000 Gerd Knorr <kraxel@...dbach.in-berlin.de>
+ * modified for PixelView (BT878P+W/FM) by
+ *      Michal Kochanowicz <mkochano@....org.pl>
+ *      Christoph Bartelmus <lirc@...telmus.de>
+ * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
+ *      Ulrich Mueller <ulrich.mueller42@....de>
+ * modified for Asus TV-Box and Creative/VisionTek BreakOut-Box by
+ *      Stefan Jahn <stefan@...c.org>
+ * modified for inclusion into kernel sources by
+ *      Jerome Brock <jbrock@...rs.sourceforge.net>
+ * modified for Leadtek Winfast PVR2000 by
+ *      Thomas Reitmayr (treitmayr@...oo.com)
+ * modified for Hauppauge HVR-1300 by
+ *      Jan Frey (jfrey@....de)
+ *
+ * parts are cut&pasted from the old lirc_haup.c driver
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <linux/semaphore.h>
+
+#include "lirc_dev.h"
+
+struct IR {
+	struct lirc_plugin l;
+	struct i2c_client  c;
+	int nextkey;
+	unsigned char b[3];
+	unsigned char bits;
+	unsigned char flag;
+};
+
+/* ----------------------------------------------------------------------- */
+
+#define DEVICE_NAME "lirc_i2c"
+
+/* ----------------------------------------------------------------------- */
+/* insmod parameters						       */
+
+static int debug;	/* debug output */
+static int minor = -1;	/* minor number */
+
+#define dprintk(fmt, args...)						\
+	do {								\
+		if (debug)						\
+			printk(KERN_DEBUG DEVICE_NAME ": " fmt,		\
+			       ## args);				\
+	} while (0)
+
+/* ----------------------------------------------------------------------- */
+
+static inline int reverse(int data, int bits)
+{
+	int i;
+	int c;
+
+	for (c = 0, i = 0; i < bits; i++)
+		c |= ((data & (1<<i)) ? 1 : 0) << (bits-1-i);
+
+	return c;
+}
+
+static int add_to_buf_adap(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char keybuf[4];
+
+	keybuf[0] = 0x00;
+	i2c_master_send(&ir->c, keybuf, 1);
+	/* poll IR chip */
+	if (i2c_master_recv(&ir->c, keybuf, sizeof(keybuf)) != sizeof(keybuf)) {
+		dprintk("read error\n");
+		return -EIO;
+	}
+
+	dprintk("key (0x%02x%02x%02x%02x)\n",
+		keybuf[0], keybuf[1], keybuf[2], keybuf[3]);
+
+	/* key pressed ? */
+	if (keybuf[2] == 0xff)
+		return -ENODATA;
+
+	/* remove repeat bit */
+	keybuf[2] &= 0x7f;
+	keybuf[3] |= 0x80;
+
+	lirc_buffer_write_1(buf, keybuf);
+	return 0;
+}
+
+static int add_to_buf_pcf8574(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	int rc;
+	unsigned char all, mask;
+	unsigned char key;
+
+	/* compute all valid bits (key code + pressed/release flag) */
+	all = ir->bits | ir->flag;
+
+	/* save IR writable mask bits */
+	mask = i2c_smbus_read_byte(&ir->c) & ~all;
+
+	/* send bit mask */
+	rc = i2c_smbus_write_byte(&ir->c, (0xff & all) | mask);
+
+	/* receive scan code */
+	rc = i2c_smbus_read_byte(&ir->c);
+
+	if (rc == -1) {
+		dprintk("%s read error\n", ir->c.name);
+		return -EIO;
+	}
+
+	/* drop duplicate polls */
+	if (ir->b[0] == (rc & all))
+		return -ENODATA;
+
+	ir->b[0] = rc & all;
+
+	dprintk("%s key 0x%02X %s\n", ir->c.name, rc & ir->bits,
+		(rc & ir->flag) ? "released" : "pressed");
+
+	if (rc & ir->flag) {
+		/* ignore released buttons */
+		return -ENODATA;
+	}
+
+	/* set valid key code */
+	key  = rc & ir->bits;
+	lirc_buffer_write_1(buf, &key);
+	return 0;
+}
+
+/* common for Hauppauge IR receivers */
+static int add_to_buf_haup_common(void *data, struct lirc_buffer *buf,
+		unsigned char *keybuf, int size, int offset)
+{
+	struct IR *ir = data;
+	__u16 code;
+	unsigned char codes[2];
+
+	/* poll IR chip */
+	if (size == i2c_master_recv(&ir->c, keybuf, size)) {
+		ir->b[0] = keybuf[offset];
+		ir->b[1] = keybuf[offset+1];
+		ir->b[2] = keybuf[offset+2];
+		dprintk("key (0x%02x/0x%02x)\n", ir->b[0], ir->b[1]);
+	} else {
+		dprintk("read error\n");
+		/* keep last successfull read buffer */
+	}
+
+	/* key pressed ? */
+	if ((ir->b[0] & 0x80) == 0)
+		return -ENODATA;
+
+	/* look what we have */
+	code = (((__u16)ir->b[0]&0x7f)<<6) | (ir->b[1]>>2);
+
+	codes[0] = (code >> 8) & 0xff;
+	codes[1] = code & 0xff;
+
+	/* return it */
+	lirc_buffer_write_1(buf, codes);
+	return 0;
+}
+
+/* specific for the Hauppauge PVR150 IR receiver */
+static int add_to_buf_haup_pvr150(void *data, struct lirc_buffer *buf)
+{
+	unsigned char keybuf[6];
+	/* fetch 6 bytes, first relevant is at offset 3 */
+	return add_to_buf_haup_common(data, buf, keybuf, 6, 3);
+}
+
+/* used for all Hauppauge IR receivers but the PVR150 */
+static int add_to_buf_haup(void *data, struct lirc_buffer *buf)
+{
+	unsigned char keybuf[3];
+	/* fetch 3 bytes, first relevant is at offset 0 */
+	return add_to_buf_haup_common(data, buf, keybuf, 3, 0);
+}
+
+
+static int add_to_buf_pvr2000(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char key;
+	s32 flags;
+	s32 code;
+
+	/* poll IR chip */
+	flags = i2c_smbus_read_byte_data(&ir->c, 0x10);
+	if (-1 == flags) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+	/* key pressed ? */
+	if (0 == (flags & 0x80))
+		return -ENODATA;
+
+	/* read actual key code */
+	code = i2c_smbus_read_byte_data(&ir->c, 0x00);
+	if (-1 == code) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+
+	key = code & 0xFF;
+
+	dprintk("IR Key/Flags: (0x%02x/0x%02x)\n", key, flags & 0xFF);
+
+	/* return it */
+	lirc_buffer_write_1(buf, &key);
+	return 0;
+}
+
+static int add_to_buf_pixelview(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char key;
+
+	/* poll IR chip */
+	if (1 != i2c_master_recv(&ir->c, &key, 1)) {
+		dprintk("read error\n");
+		return -1;
+	}
+	dprintk("key %02x\n", key);
+
+	/* return it */
+	lirc_buffer_write_1(buf, &key);
+	return 0;
+}
+
+static int add_to_buf_pv951(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char key;
+	unsigned char codes[4];
+
+	/* poll IR chip */
+	if (1 != i2c_master_recv(&ir->c, &key, 1)) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+	/* ignore 0xaa */
+	if (key == 0xaa)
+		return -ENODATA;
+	dprintk("key %02x\n", key);
+
+	codes[0] = 0x61;
+	codes[1] = 0xD6;
+	codes[2] = reverse(key, 8);
+	codes[3] = (~codes[2])&0xff;
+
+	lirc_buffer_write_1(buf, codes);
+	return 0;
+}
+
+static int add_to_buf_knc1(void *data, struct lirc_buffer *buf)
+{
+	static unsigned char last_key = 0xFF;
+	struct IR *ir = data;
+	unsigned char key;
+
+	/* poll IR chip */
+	if (1 != i2c_master_recv(&ir->c, &key, 1)) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+
+	/* it seems that 0xFE indicates that a button is still hold
+	   down, while 0xFF indicates that no button is hold
+	   down. 0xFE sequences are sometimes interrupted by 0xFF */
+
+	dprintk("key %02x\n", key);
+
+	if (key == 0xFF)
+		return -ENODATA;
+
+	if (key == 0xFE)
+		key = last_key;
+
+	last_key = key;
+	lirc_buffer_write_1(buf, &key);
+
+	return 0;
+}
+
+static int set_use_inc(void *data)
+{
+	struct IR *ir = data;
+
+	/* lock bttv in memory while /dev/lirc is in use  */
+	i2c_use_client(&ir->c);
+
+	return 0;
+}
+
+static void set_use_dec(void *data)
+{
+	struct IR *ir = data;
+
+	i2c_release_client(&ir->c);
+}
+
+static struct lirc_plugin lirc_template = {
+	.name		= "lirc_i2c",
+	.set_use_inc	= set_use_inc,
+	.set_use_dec	= set_use_dec,
+	.dev		= NULL,
+	.owner		= THIS_MODULE,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static int ir_attach(struct i2c_adapter *adap, int addr,
+		      unsigned short flags, int kind);
+static int ir_detach(struct i2c_client *client);
+static int ir_probe(struct i2c_adapter *adap);
+static int ir_command(struct i2c_client *client, unsigned int cmd, void *arg);
+
+static struct i2c_driver driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= "i2c ir driver",
+	},
+	.attach_adapter	= ir_probe,
+	.detach_client	= ir_detach,
+	.command	= ir_command,
+};
+
+static struct i2c_client client_template = {
+	.name		= "unset",
+	.driver		= &driver
+};
+
+static int ir_attach(struct i2c_adapter *adap, int addr,
+		     unsigned short flags, int kind)
+{
+	struct IR *ir;
+	int err;
+
+	client_template.adapter = adap;
+	client_template.addr = addr;
+
+	ir = kmalloc(sizeof(struct IR), GFP_KERNEL);
+	if (!ir)
+		return -ENOMEM;
+	memcpy(&ir->l, &lirc_template, sizeof(struct lirc_plugin));
+	memcpy(&ir->c, &client_template, sizeof(struct i2c_client));
+
+	ir->c.adapter = adap;
+	ir->c.addr    = addr;
+	i2c_set_clientdata(&ir->c, ir);
+	ir->l.data    = ir;
+	ir->l.minor   = minor;
+	ir->l.sample_rate = 10;
+	ir->nextkey   = -1;
+
+	switch (addr) {
+	case 0x64:
+		strlcpy(ir->c.name, "Pixelview IR", I2C_NAME_SIZE);
+		ir->l.code_length = 8;
+		ir->l.add_to_buf = add_to_buf_pixelview;
+		break;
+	case 0x4b:
+		strlcpy(ir->c.name, "PV951 IR", I2C_NAME_SIZE);
+		ir->l.code_length = 32;
+		ir->l.add_to_buf = add_to_buf_pv951;
+		break;
+	case 0x71:
+		if (adap->id == I2C_HW_B_BT848 ||
+		    adap->id == I2C_HW_B_CX2341X) {
+			/* The PVR150 IR receiver uses the same protocol as
+			 * other Hauppauge cards, but the data flow is
+			 * different, so we need to deal with it by its own. */
+			strlcpy(ir->c.name, "Hauppauge PVR150", I2C_NAME_SIZE);
+		} else /* I2C_HW_B_CX2388x */
+			strlcpy(ir->c.name, "Hauppauge HVR1300", I2C_NAME_SIZE);
+		ir->l.code_length = 13;
+		ir->l.add_to_buf = add_to_buf_haup_pvr150;
+		break;
+	case 0x6b:
+		strlcpy(ir->c.name, "Adaptec IR", I2C_NAME_SIZE);
+		ir->l.code_length = 32;
+		ir->l.add_to_buf = add_to_buf_adap;
+		break;
+	case 0x18:
+	case 0x1a:
+		if (adap->id == I2C_HW_B_BT848 ||
+		    adap->id == I2C_HW_B_CX2341X) {
+			strlcpy(ir->c.name, "Hauppauge IR", I2C_NAME_SIZE);
+			ir->l.code_length = 13;
+			ir->l.add_to_buf = add_to_buf_haup;
+		} else { /* I2C_HW_B_CX2388x */
+			strlcpy(ir->c.name, "Leadtek IR", I2C_NAME_SIZE);
+			ir->l.code_length = 8;
+			ir->l.add_to_buf = add_to_buf_pvr2000;
+		}
+		break;
+	case 0x30:
+		strlcpy(ir->c.name, "KNC ONE IR", I2C_NAME_SIZE);
+		ir->l.code_length = 8;
+		ir->l.add_to_buf = add_to_buf_knc1;
+		break;
+	case 0x21:
+	case 0x23:
+		strlcpy(ir->c.name, "TV-Box IR", I2C_NAME_SIZE);
+		ir->l.code_length = 8;
+		ir->l.add_to_buf = add_to_buf_pcf8574;
+		ir->bits = flags & 0xff;
+		ir->flag = (flags >> 8) & 0xff;
+		break;
+	default:
+		/* shouldn't happen */
+		printk("lirc_i2c: Huh? unknown i2c address (0x%02x)?\n", addr);
+		kfree(ir);
+		return -1;
+	}
+	printk(KERN_INFO "lirc_i2c: chip 0x%x found @ 0x%02x (%s)\n",
+	       adap->id, addr, ir->c.name);
+
+	/* register device */
+	err = i2c_attach_client(&ir->c);
+	if (err) {
+		kfree(ir);
+		return err;
+	}
+	ir->l.minor = lirc_register_plugin(&ir->l);
+
+	return 0;
+}
+
+static int ir_detach(struct i2c_client *client)
+{
+	struct IR *ir = i2c_get_clientdata(client);
+
+	/* unregister device */
+	lirc_unregister_plugin(ir->l.minor);
+	i2c_detach_client(&ir->c);
+
+	/* free memory */
+	kfree(ir);
+	return 0;
+}
+
+static int ir_probe(struct i2c_adapter *adap)
+{
+	/* The external IR receiver is at i2c address 0x34 (0x35 for
+	 * reads).  Future Hauppauge cards will have an internal
+	 * receiver at 0x30 (0x31 for reads).  In theory, both can be
+	 * fitted, and Hauppauge suggest an external overrides an
+	 * internal.
+	 *
+	 * That's why we probe 0x1a (~0x34) first. CB
+	 *
+	 * The i2c address for the Hauppauge PVR-150 card is 0xe2,
+	 * so we need to probe 0x71 as well. */
+
+	static const int probe[] = {
+		0x1a, /* Hauppauge IR external */
+		0x18, /* Hauppauge IR internal */
+		0x71, /* Hauppauge IR (PVR150) */
+		0x4b, /* PV951 IR */
+		0x64, /* Pixelview IR */
+		0x30, /* KNC ONE IR */
+		0x6b, /* Adaptec IR */
+		-1};
+
+	static const int probe_cx88[] = {
+		0x18, /* Leadtek Winfast PVR2000 */
+		0x71, /* Hauppauge HVR-IR */
+		-1};
+
+	struct i2c_client c;
+	char buf;
+	int i, rc;
+
+	if (adap->id == I2C_HW_B_BT848 ||
+	    adap->id == I2C_HW_B_CX2341X) {
+		memset(&c, 0, sizeof(c));
+		c.adapter = adap;
+		for (i = 0; -1 != probe[i]; i++) {
+			c.addr = probe[i];
+			rc = i2c_master_recv(&c, &buf, 1);
+			dprintk("probe 0x%02x @ %s: %s\n",
+				probe[i], adap->name,
+				(1 == rc) ? "yes" : "no");
+			if (1 == rc)
+				ir_attach(adap, probe[i], 0, 0);
+		}
+	}
+
+	/* Leadtek Winfast PVR2000 or Hauppauge HVR-1300 */
+	else if (adap->id == I2C_HW_B_CX2388x) {
+		memset(&c, 0, sizeof(c));
+		c.adapter = adap;
+		for (i = 0; -1 != probe_cx88[i]; i++) {
+			c.addr = probe_cx88[i];
+			rc = i2c_master_recv(&c, &buf, 1);
+			dprintk("probe 0x%02x @ %s: %s\n",
+				c.addr, adap->name,
+				(1 == rc) ? "yes" : "no");
+			if (1 == rc)
+				ir_attach(adap, c.addr, 0, 0);
+		}
+	}
+
+	/* Asus TV-Box and Creative/VisionTek BreakOut-Box (PCF8574) */
+	else if (adap->id == I2C_HW_B_RIVA) {
+		/* addresses to probe;
+		   leave 0x24 and 0x25 because SAA7113H possibly uses it
+		   0x21 and 0x22 possibly used by SAA7108E
+		   Asus:      0x21 is a correct address (channel 1 of PCF8574)
+		   Creative:  0x23 is a correct address (channel 3 of PCF8574)
+		   VisionTek: 0x23 is a correct address (channel 3 of PCF8574)
+		*/
+		static const int pcf_probe[] = { 0x20, 0x21, 0x22, 0x23,
+						 0x24, 0x25, 0x26, 0x27, -1 };
+		int ret1, ret2, ret3, ret4;
+		unsigned char bits = 0, flag = 0;
+
+		memset(&c, 0, sizeof(c));
+		c.adapter = adap;
+		for (i = 0; -1 != pcf_probe[i]; i++) {
+			c.addr = pcf_probe[i];
+			ret1 = i2c_smbus_write_byte(&c, 0xff);
+			ret2 = i2c_smbus_read_byte(&c);
+			ret3 = i2c_smbus_write_byte(&c, 0x00);
+			ret4 = i2c_smbus_read_byte(&c);
+
+			/* ensure that the writable bitmask works correctly */
+			rc = 0;
+			if (ret1 != -1 && ret2 != -1 &&
+			    ret3 != -1 && ret4 != -1) {
+				/* in the Asus TV-Box: bit 1-0 */
+				if (((ret2 & 0x03) == 0x03) &&
+				    ((ret4 & 0x03) == 0x00)) {
+					bits = (unsigned char) ~0x07;
+					flag = 0x04;
+					rc = 1;
+				}
+			/* in the Creative/VisionTek BreakOut-Box: bit 7-6 */
+				if (((ret2 & 0xc0) == 0xc0) &&
+				    ((ret4 & 0xc0) == 0x00)) {
+					bits = (unsigned char) ~0xe0;
+					flag = 0x20;
+					rc = 1;
+				}
+			}
+			dprintk("probe 0x%02x @ %s: %s\n",
+				c.addr, adap->name, rc ? "yes" : "no");
+			if (rc)
+				ir_attach(adap, pcf_probe[i],
+					  bits|(flag<<8), 0);
+		}
+	}
+
+	return 0;
+}
+
+static int ir_command(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+	/* nothing */
+	return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+#ifdef MODULE
+
+int init_module(void)
+{
+	request_module("bttv");
+	request_module("rivatv");
+	request_module("ivtv");
+	request_module("cx8800");
+	i2c_add_driver(&driver);
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	i2c_del_driver(&driver);
+}
+
+MODULE_DESCRIPTION("Infrared receiver driver for Hauppauge and "
+		   "Pixelview cards (i2c stack)");
+MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, "
+	      "Ulrich Mueller, Stefan Jahn, Jerome Brock");
+MODULE_LICENSE("GPL");
+
+module_param(minor, int, 0444);
+MODULE_PARM_DESC(minor, "Preferred minor device number");
+
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
+
+#endif /* MODULE */
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
-- 
1.6.0.1

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