Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 705 insertions, 0 deletions

diff --git a/drivers/input/joystick/db9.c b/drivers/input/joystick/db9.c
new file mode 100644
index 000000000..e5d9b71aa
--- /dev/null
+++ b/drivers/input/joystick/db9.c
@@ -0,0 +1,705 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (c) 1999-2001 Vojtech Pavlik
+ *
+ *  Based on the work of:
+ *	Andree Borrmann		Mats Sjövall
+ */
+
+/*
+ * Atari, Amstrad, Commodore, Amiga, Sega, etc. joystick driver for Linux
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/parport.h>
+#include <linux/input.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION("Atari, Amstrad, Commodore, Amiga, Sega, etc. joystick driver");
+MODULE_LICENSE("GPL");
+
+struct db9_config {
+	int args[2];
+	unsigned int nargs;
+};
+
+#define DB9_MAX_PORTS		3
+static struct db9_config db9_cfg[DB9_MAX_PORTS];
+
+module_param_array_named(dev, db9_cfg[0].args, int, &db9_cfg[0].nargs, 0);
+MODULE_PARM_DESC(dev, "Describes first attached device (<parport#>,<type>)");
+module_param_array_named(dev2, db9_cfg[1].args, int, &db9_cfg[1].nargs, 0);
+MODULE_PARM_DESC(dev2, "Describes second attached device (<parport#>,<type>)");
+module_param_array_named(dev3, db9_cfg[2].args, int, &db9_cfg[2].nargs, 0);
+MODULE_PARM_DESC(dev3, "Describes third attached device (<parport#>,<type>)");
+
+#define DB9_ARG_PARPORT		0
+#define DB9_ARG_MODE		1
+
+#define DB9_MULTI_STICK		0x01
+#define DB9_MULTI2_STICK	0x02
+#define DB9_GENESIS_PAD		0x03
+#define DB9_GENESIS5_PAD	0x05
+#define DB9_GENESIS6_PAD	0x06
+#define DB9_SATURN_PAD		0x07
+#define DB9_MULTI_0802		0x08
+#define DB9_MULTI_0802_2	0x09
+#define DB9_CD32_PAD		0x0A
+#define DB9_SATURN_DPP		0x0B
+#define DB9_SATURN_DPP_2	0x0C
+#define DB9_MAX_PAD		0x0D
+
+#define DB9_UP			0x01
+#define DB9_DOWN		0x02
+#define DB9_LEFT		0x04
+#define DB9_RIGHT		0x08
+#define DB9_FIRE1		0x10
+#define DB9_FIRE2		0x20
+#define DB9_FIRE3		0x40
+#define DB9_FIRE4		0x80
+
+#define DB9_NORMAL		0x0a
+#define DB9_NOSELECT		0x08
+
+#define DB9_GENESIS6_DELAY	14
+#define DB9_REFRESH_TIME	HZ/100
+
+#define DB9_MAX_DEVICES		2
+
+struct db9_mode_data {
+	const char *name;
+	const short *buttons;
+	int n_buttons;
+	int n_pads;
+	int n_axis;
+	int bidirectional;
+	int reverse;
+};
+
+struct db9 {
+	struct input_dev *dev[DB9_MAX_DEVICES];
+	struct timer_list timer;
+	struct pardevice *pd;
+	int mode;
+	int used;
+	int parportno;
+	struct mutex mutex;
+	char phys[DB9_MAX_DEVICES][32];
+};
+
+static struct db9 *db9_base[3];
+
+static const short db9_multi_btn[] = { BTN_TRIGGER, BTN_THUMB };
+static const short db9_genesis_btn[] = { BTN_START, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_MODE };
+static const short db9_cd32_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START };
+static const short db9_abs[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_RZ, ABS_Z, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y };
+
+static const struct db9_mode_data db9_modes[] = {
+	{ NULL,					 NULL,		  0,  0,  0,  0,  0 },
+	{ "Multisystem joystick",		 db9_multi_btn,	  1,  1,  2,  1,  1 },
+	{ "Multisystem joystick (2 fire)",	 db9_multi_btn,	  2,  1,  2,  1,  1 },
+	{ "Genesis pad",			 db9_genesis_btn, 4,  1,  2,  1,  1 },
+	{ NULL,					 NULL,		  0,  0,  0,  0,  0 },
+	{ "Genesis 5 pad",			 db9_genesis_btn, 6,  1,  2,  1,  1 },
+	{ "Genesis 6 pad",			 db9_genesis_btn, 8,  1,  2,  1,  1 },
+	{ "Saturn pad",				 db9_cd32_btn,	  9,  6,  7,  0,  1 },
+	{ "Multisystem (0.8.0.2) joystick",	 db9_multi_btn,	  1,  1,  2,  1,  1 },
+	{ "Multisystem (0.8.0.2-dual) joystick", db9_multi_btn,	  1,  2,  2,  1,  1 },
+	{ "Amiga CD-32 pad",			 db9_cd32_btn,	  7,  1,  2,  1,  1 },
+	{ "Saturn dpp",				 db9_cd32_btn,	  9,  6,  7,  0,  0 },
+	{ "Saturn dpp dual",			 db9_cd32_btn,	  9,  12, 7,  0,  0 },
+};
+
+/*
+ * Saturn controllers
+ */
+#define DB9_SATURN_DELAY 300
+static const int db9_saturn_byte[] = { 1, 1, 1, 2, 2, 2, 2, 2, 1 };
+static const unsigned char db9_saturn_mask[] = { 0x04, 0x01, 0x02, 0x40, 0x20, 0x10, 0x08, 0x80, 0x08 };
+
+/*
+ * db9_saturn_write_sub() writes 2 bit data.
+ */
+static void db9_saturn_write_sub(struct parport *port, int type, unsigned char data, int powered, int pwr_sub)
+{
+	unsigned char c;
+
+	switch (type) {
+	case 1: /* DPP1 */
+		c = 0x80 | 0x30 | (powered ? 0x08 : 0) | (pwr_sub ? 0x04 : 0) | data;
+		parport_write_data(port, c);
+		break;
+	case 2: /* DPP2 */
+		c = 0x40 | data << 4 | (powered ? 0x08 : 0) | (pwr_sub ? 0x04 : 0) | 0x03;
+		parport_write_data(port, c);
+		break;
+	case 0:	/* DB9 */
+		c = ((((data & 2) ? 2 : 0) | ((data & 1) ? 4 : 0)) ^ 0x02) | !powered;
+		parport_write_control(port, c);
+		break;
+	}
+}
+
+/*
+ * gc_saturn_read_sub() reads 4 bit data.
+ */
+static unsigned char db9_saturn_read_sub(struct parport *port, int type)
+{
+	unsigned char data;
+
+	if (type) {
+		/* DPP */
+		data = parport_read_status(port) ^ 0x80;
+		return (data & 0x80 ? 1 : 0) | (data & 0x40 ? 2 : 0)
+		     | (data & 0x20 ? 4 : 0) | (data & 0x10 ? 8 : 0);
+	} else {
+		/* DB9 */
+		data = parport_read_data(port) & 0x0f;
+		return (data & 0x8 ? 1 : 0) | (data & 0x4 ? 2 : 0)
+		     | (data & 0x2 ? 4 : 0) | (data & 0x1 ? 8 : 0);
+	}
+}
+
+/*
+ * db9_saturn_read_analog() sends clock and reads 8 bit data.
+ */
+static unsigned char db9_saturn_read_analog(struct parport *port, int type, int powered)
+{
+	unsigned char data;
+
+	db9_saturn_write_sub(port, type, 0, powered, 0);
+	udelay(DB9_SATURN_DELAY);
+	data = db9_saturn_read_sub(port, type) << 4;
+	db9_saturn_write_sub(port, type, 2, powered, 0);
+	udelay(DB9_SATURN_DELAY);
+	data |= db9_saturn_read_sub(port, type);
+	return data;
+}
+
+/*
+ * db9_saturn_read_packet() reads whole saturn packet at connector
+ * and returns device identifier code.
+ */
+static unsigned char db9_saturn_read_packet(struct parport *port, unsigned char *data, int type, int powered)
+{
+	int i, j;
+	unsigned char tmp;
+
+	db9_saturn_write_sub(port, type, 3, powered, 0);
+	data[0] = db9_saturn_read_sub(port, type);
+	switch (data[0] & 0x0f) {
+	case 0xf:
+		/* 1111  no pad */
+		return data[0] = 0xff;
+	case 0x4: case 0x4 | 0x8:
+		/* ?100 : digital controller */
+		db9_saturn_write_sub(port, type, 0, powered, 1);
+		data[2] = db9_saturn_read_sub(port, type) << 4;
+		db9_saturn_write_sub(port, type, 2, powered, 1);
+		data[1] = db9_saturn_read_sub(port, type) << 4;
+		db9_saturn_write_sub(port, type, 1, powered, 1);
+		data[1] |= db9_saturn_read_sub(port, type);
+		db9_saturn_write_sub(port, type, 3, powered, 1);
+		/* data[2] |= db9_saturn_read_sub(port, type); */
+		data[2] |= data[0];
+		return data[0] = 0x02;
+	case 0x1:
+		/* 0001 : analog controller or multitap */
+		db9_saturn_write_sub(port, type, 2, powered, 0);
+		udelay(DB9_SATURN_DELAY);
+		data[0] = db9_saturn_read_analog(port, type, powered);
+		if (data[0] != 0x41) {
+			/* read analog controller */
+			for (i = 0; i < (data[0] & 0x0f); i++)
+				data[i + 1] = db9_saturn_read_analog(port, type, powered);
+			db9_saturn_write_sub(port, type, 3, powered, 0);
+			return data[0];
+		} else {
+			/* read multitap */
+			if (db9_saturn_read_analog(port, type, powered) != 0x60)
+				return data[0] = 0xff;
+			for (i = 0; i < 60; i += 10) {
+				data[i] = db9_saturn_read_analog(port, type, powered);
+				if (data[i] != 0xff)
+					/* read each pad */
+					for (j = 0; j < (data[i] & 0x0f); j++)
+						data[i + j + 1] = db9_saturn_read_analog(port, type, powered);
+			}
+			db9_saturn_write_sub(port, type, 3, powered, 0);
+			return 0x41;
+		}
+	case 0x0:
+		/* 0000 : mouse */
+		db9_saturn_write_sub(port, type, 2, powered, 0);
+		udelay(DB9_SATURN_DELAY);
+		tmp = db9_saturn_read_analog(port, type, powered);
+		if (tmp == 0xff) {
+			for (i = 0; i < 3; i++)
+				data[i + 1] = db9_saturn_read_analog(port, type, powered);
+			db9_saturn_write_sub(port, type, 3, powered, 0);
+			return data[0] = 0xe3;
+		}
+		fallthrough;
+	default:
+		return data[0];
+	}
+}
+
+/*
+ * db9_saturn_report() analyzes packet and reports.
+ */
+static int db9_saturn_report(unsigned char id, unsigned char data[60], struct input_dev *devs[], int n, int max_pads)
+{
+	struct input_dev *dev;
+	int tmp, i, j;
+
+	tmp = (id == 0x41) ? 60 : 10;
+	for (j = 0; j < tmp && n < max_pads; j += 10, n++) {
+		dev = devs[n];
+		switch (data[j]) {
+		case 0x16: /* multi controller (analog 4 axis) */
+			input_report_abs(dev, db9_abs[5], data[j + 6]);
+			fallthrough;
+		case 0x15: /* mission stick (analog 3 axis) */
+			input_report_abs(dev, db9_abs[3], data[j + 4]);
+			input_report_abs(dev, db9_abs[4], data[j + 5]);
+			fallthrough;
+		case 0x13: /* racing controller (analog 1 axis) */
+			input_report_abs(dev, db9_abs[2], data[j + 3]);
+			fallthrough;
+		case 0x34: /* saturn keyboard (udlr ZXC ASD QE Esc) */
+		case 0x02: /* digital pad (digital 2 axis + buttons) */
+			input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
+			input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
+			for (i = 0; i < 9; i++)
+				input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
+			break;
+		case 0x19: /* mission stick x2 (analog 6 axis + buttons) */
+			input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
+			input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
+			for (i = 0; i < 9; i++)
+				input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
+			input_report_abs(dev, db9_abs[2], data[j + 3]);
+			input_report_abs(dev, db9_abs[3], data[j + 4]);
+			input_report_abs(dev, db9_abs[4], data[j + 5]);
+			/*
+			input_report_abs(dev, db9_abs[8], (data[j + 6] & 128 ? 0 : 1) - (data[j + 6] & 64 ? 0 : 1));
+			input_report_abs(dev, db9_abs[9], (data[j + 6] & 32 ? 0 : 1) - (data[j + 6] & 16 ? 0 : 1));
+			*/
+			input_report_abs(dev, db9_abs[6], data[j + 7]);
+			input_report_abs(dev, db9_abs[7], data[j + 8]);
+			input_report_abs(dev, db9_abs[5], data[j + 9]);
+			break;
+		case 0xd3: /* sankyo ff (analog 1 axis + stop btn) */
+			input_report_key(dev, BTN_A, data[j + 3] & 0x80);
+			input_report_abs(dev, db9_abs[2], data[j + 3] & 0x7f);
+			break;
+		case 0xe3: /* shuttle mouse (analog 2 axis + buttons. signed value) */
+			input_report_key(dev, BTN_START, data[j + 1] & 0x08);
+			input_report_key(dev, BTN_A, data[j + 1] & 0x04);
+			input_report_key(dev, BTN_C, data[j + 1] & 0x02);
+			input_report_key(dev, BTN_B, data[j + 1] & 0x01);
+			input_report_abs(dev, db9_abs[2], data[j + 2] ^ 0x80);
+			input_report_abs(dev, db9_abs[3], (0xff-(data[j + 3] ^ 0x80))+1); /* */
+			break;
+		case 0xff:
+		default: /* no pad */
+			input_report_abs(dev, db9_abs[0], 0);
+			input_report_abs(dev, db9_abs[1], 0);
+			for (i = 0; i < 9; i++)
+				input_report_key(dev, db9_cd32_btn[i], 0);
+			break;
+		}
+	}
+	return n;
+}
+
+static int db9_saturn(int mode, struct parport *port, struct input_dev *devs[])
+{
+	unsigned char id, data[60];
+	int type, n, max_pads;
+	int tmp, i;
+
+	switch (mode) {
+	case DB9_SATURN_PAD:
+		type = 0;
+		n = 1;
+		break;
+	case DB9_SATURN_DPP:
+		type = 1;
+		n = 1;
+		break;
+	case DB9_SATURN_DPP_2:
+		type = 1;
+		n = 2;
+		break;
+	default:
+		return -1;
+	}
+	max_pads = min(db9_modes[mode].n_pads, DB9_MAX_DEVICES);
+	for (tmp = 0, i = 0; i < n; i++) {
+		id = db9_saturn_read_packet(port, data, type + i, 1);
+		tmp = db9_saturn_report(id, data, devs, tmp, max_pads);
+	}
+	return 0;
+}
+
+static void db9_timer(struct timer_list *t)
+{
+	struct db9 *db9 = timer_container_of(db9, t, timer);
+	struct parport *port = db9->pd->port;
+	struct input_dev *dev = db9->dev[0];
+	struct input_dev *dev2 = db9->dev[1];
+	int data, i;
+
+	switch (db9->mode) {
+		case DB9_MULTI_0802_2:
+
+			data = parport_read_data(port) >> 3;
+
+			input_report_abs(dev2, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev2, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+			input_report_key(dev2, BTN_TRIGGER, ~data & DB9_FIRE1);
+			fallthrough;
+
+		case DB9_MULTI_0802:
+
+			data = parport_read_status(port) >> 3;
+
+			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+			input_report_key(dev, BTN_TRIGGER, data & DB9_FIRE1);
+			break;
+
+		case DB9_MULTI_STICK:
+
+			data = parport_read_data(port);
+
+			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+			input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
+			break;
+
+		case DB9_MULTI2_STICK:
+
+			data = parport_read_data(port);
+
+			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+			input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
+			input_report_key(dev, BTN_THUMB,   ~data & DB9_FIRE2);
+			break;
+
+		case DB9_GENESIS_PAD:
+
+			parport_write_control(port, DB9_NOSELECT);
+			data = parport_read_data(port);
+
+			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
+			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);
+
+			parport_write_control(port, DB9_NORMAL);
+			data = parport_read_data(port);
+
+			input_report_key(dev, BTN_A,     ~data & DB9_FIRE1);
+			input_report_key(dev, BTN_START, ~data & DB9_FIRE2);
+			break;
+
+		case DB9_GENESIS5_PAD:
+
+			parport_write_control(port, DB9_NOSELECT);
+			data = parport_read_data(port);
+
+			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
+			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);
+
+			parport_write_control(port, DB9_NORMAL);
+			data = parport_read_data(port);
+
+			input_report_key(dev, BTN_A,     ~data & DB9_FIRE1);
+			input_report_key(dev, BTN_X,     ~data & DB9_FIRE2);
+			input_report_key(dev, BTN_Y,     ~data & DB9_LEFT);
+			input_report_key(dev, BTN_START, ~data & DB9_RIGHT);
+			break;
+
+		case DB9_GENESIS6_PAD:
+
+			parport_write_control(port, DB9_NOSELECT); /* 1 */
+			udelay(DB9_GENESIS6_DELAY);
+			data = parport_read_data(port);
+
+			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
+			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);
+
+			parport_write_control(port, DB9_NORMAL);
+			udelay(DB9_GENESIS6_DELAY);
+			data = parport_read_data(port);
+
+			input_report_key(dev, BTN_A, ~data & DB9_FIRE1);
+			input_report_key(dev, BTN_START, ~data & DB9_FIRE2);
+
+			parport_write_control(port, DB9_NOSELECT); /* 2 */
+			udelay(DB9_GENESIS6_DELAY);
+			parport_write_control(port, DB9_NORMAL);
+			udelay(DB9_GENESIS6_DELAY);
+			parport_write_control(port, DB9_NOSELECT); /* 3 */
+			udelay(DB9_GENESIS6_DELAY);
+			data=parport_read_data(port);
+
+			input_report_key(dev, BTN_X,    ~data & DB9_LEFT);
+			input_report_key(dev, BTN_Y,    ~data & DB9_DOWN);
+			input_report_key(dev, BTN_Z,    ~data & DB9_UP);
+			input_report_key(dev, BTN_MODE, ~data & DB9_RIGHT);
+
+			parport_write_control(port, DB9_NORMAL);
+			udelay(DB9_GENESIS6_DELAY);
+			parport_write_control(port, DB9_NOSELECT); /* 4 */
+			udelay(DB9_GENESIS6_DELAY);
+			parport_write_control(port, DB9_NORMAL);
+			break;
+
+		case DB9_SATURN_PAD:
+		case DB9_SATURN_DPP:
+		case DB9_SATURN_DPP_2:
+
+			db9_saturn(db9->mode, port, db9->dev);
+			break;
+
+		case DB9_CD32_PAD:
+
+			data = parport_read_data(port);
+
+			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
+			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
+
+			parport_write_control(port, 0x0a);
+
+			for (i = 0; i < 7; i++) {
+				data = parport_read_data(port);
+				parport_write_control(port, 0x02);
+				parport_write_control(port, 0x0a);
+				input_report_key(dev, db9_cd32_btn[i], ~data & DB9_FIRE2);
+			}
+
+			parport_write_control(port, 0x00);
+			break;
+		}
+
+	input_sync(dev);
+
+	mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
+}
+
+static int db9_open(struct input_dev *dev)
+{
+	struct db9 *db9 = input_get_drvdata(dev);
+	struct parport *port = db9->pd->port;
+
+	scoped_guard(mutex_intr, &db9->mutex) {
+		if (!db9->used++) {
+			parport_claim(db9->pd);
+			parport_write_data(port, 0xff);
+			if (db9_modes[db9->mode].reverse) {
+				parport_data_reverse(port);
+				parport_write_control(port, DB9_NORMAL);
+			}
+			mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
+		}
+
+		return 0;
+	}
+
+	return -EINTR;
+}
+
+static void db9_close(struct input_dev *dev)
+{
+	struct db9 *db9 = input_get_drvdata(dev);
+	struct parport *port = db9->pd->port;
+
+	guard(mutex)(&db9->mutex);
+
+	if (!--db9->used) {
+		timer_delete_sync(&db9->timer);
+		parport_write_control(port, 0x00);
+		parport_data_forward(port);
+		parport_release(db9->pd);
+	}
+}
+
+static void db9_attach(struct parport *pp)
+{
+	struct db9 *db9;
+	const struct db9_mode_data *db9_mode;
+	struct pardevice *pd;
+	struct input_dev *input_dev;
+	int i, j, port_idx;
+	int mode;
+	struct pardev_cb db9_parport_cb;
+
+	for (port_idx = 0; port_idx < DB9_MAX_PORTS; port_idx++) {
+		if (db9_cfg[port_idx].nargs == 0 ||
+		    db9_cfg[port_idx].args[DB9_ARG_PARPORT] < 0)
+			continue;
+
+		if (db9_cfg[port_idx].args[DB9_ARG_PARPORT] == pp->number)
+			break;
+	}
+
+	if (port_idx == DB9_MAX_PORTS) {
+		pr_debug("Not using parport%d.\n", pp->number);
+		return;
+	}
+
+	mode = db9_cfg[port_idx].args[DB9_ARG_MODE];
+
+	if (mode < 1 || mode >= DB9_MAX_PAD || !db9_modes[mode].n_buttons) {
+		printk(KERN_ERR "db9.c: Bad device type %d\n", mode);
+		return;
+	}
+
+	db9_mode = &db9_modes[mode];
+
+	if (db9_mode->bidirectional && !(pp->modes & PARPORT_MODE_TRISTATE)) {
+		printk(KERN_ERR "db9.c: specified parport is not bidirectional\n");
+		return;
+	}
+
+	memset(&db9_parport_cb, 0, sizeof(db9_parport_cb));
+	db9_parport_cb.flags = PARPORT_FLAG_EXCL;
+
+	pd = parport_register_dev_model(pp, "db9", &db9_parport_cb, port_idx);
+	if (!pd) {
+		printk(KERN_ERR "db9.c: parport busy already - lp.o loaded?\n");
+		return;
+	}
+
+	db9 = kzalloc_obj(*db9);
+	if (!db9)
+		goto err_unreg_pardev;
+
+	mutex_init(&db9->mutex);
+	db9->pd = pd;
+	db9->mode = mode;
+	db9->parportno = pp->number;
+	timer_setup(&db9->timer, db9_timer, 0);
+
+	for (i = 0; i < (min(db9_mode->n_pads, DB9_MAX_DEVICES)); i++) {
+
+		db9->dev[i] = input_dev = input_allocate_device();
+		if (!input_dev) {
+			printk(KERN_ERR "db9.c: Not enough memory for input device\n");
+			goto err_unreg_devs;
+		}
+
+		snprintf(db9->phys[i], sizeof(db9->phys[i]),
+			 "%s/input%d", db9->pd->port->name, i);
+
+		input_dev->name = db9_mode->name;
+		input_dev->phys = db9->phys[i];
+		input_dev->id.bustype = BUS_PARPORT;
+		input_dev->id.vendor = 0x0002;
+		input_dev->id.product = mode;
+		input_dev->id.version = 0x0100;
+
+		input_set_drvdata(input_dev, db9);
+
+		input_dev->open = db9_open;
+		input_dev->close = db9_close;
+
+		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+		for (j = 0; j < db9_mode->n_buttons; j++)
+			set_bit(db9_mode->buttons[j], input_dev->keybit);
+		for (j = 0; j < db9_mode->n_axis; j++) {
+			if (j < 2)
+				input_set_abs_params(input_dev, db9_abs[j], -1, 1, 0, 0);
+			else
+				input_set_abs_params(input_dev, db9_abs[j], 1, 255, 0, 0);
+		}
+
+		if (input_register_device(input_dev))
+			goto err_free_dev;
+	}
+
+	db9_base[port_idx] = db9;
+	return;
+
+ err_free_dev:
+	input_free_device(db9->dev[i]);
+ err_unreg_devs:
+	while (--i >= 0)
+		input_unregister_device(db9->dev[i]);
+	kfree(db9);
+ err_unreg_pardev:
+	parport_unregister_device(pd);
+}
+
+static void db9_detach(struct parport *port)
+{
+	int i;
+	struct db9 *db9;
+
+	for (i = 0; i < DB9_MAX_PORTS; i++) {
+		if (db9_base[i] && db9_base[i]->parportno == port->number)
+			break;
+	}
+
+	if (i == DB9_MAX_PORTS)
+		return;
+
+	db9 = db9_base[i];
+	db9_base[i] = NULL;
+
+	for (i = 0; i < min(db9_modes[db9->mode].n_pads, DB9_MAX_DEVICES); i++)
+		input_unregister_device(db9->dev[i]);
+	parport_unregister_device(db9->pd);
+	kfree(db9);
+}
+
+static struct parport_driver db9_parport_driver = {
+	.name = "db9",
+	.match_port = db9_attach,
+	.detach = db9_detach,
+};
+
+static int __init db9_init(void)
+{
+	int i;
+	int have_dev = 0;
+
+	for (i = 0; i < DB9_MAX_PORTS; i++) {
+		if (db9_cfg[i].nargs == 0 || db9_cfg[i].args[DB9_ARG_PARPORT] < 0)
+			continue;
+
+		if (db9_cfg[i].nargs < 2) {
+			printk(KERN_ERR "db9.c: Device type must be specified.\n");
+			return -EINVAL;
+		}
+
+		have_dev = 1;
+	}
+
+	if (!have_dev)
+		return -ENODEV;
+
+	return parport_register_driver(&db9_parport_driver);
+}
+
+static void __exit db9_exit(void)
+{
+	parport_unregister_driver(&db9_parport_driver);
+}
+
+module_init(db9_init);
+module_exit(db9_exit);