Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 810 insertions, 0 deletions

diff --git a/drivers/input/joystick/sidewinder.c b/drivers/input/joystick/sidewinder.c
new file mode 100644
index 000000000..7f37d18c8
--- /dev/null
+++ b/drivers/input/joystick/sidewinder.c
@@ -0,0 +1,810 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (c) 1998-2005 Vojtech Pavlik
+ */
+
+/*
+ * Microsoft SideWinder joystick family driver for Linux
+ */
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/gameport.h>
+#include <linux/jiffies.h>
+#include <linux/string_choices.h>
+
+#define DRIVER_DESC	"Microsoft SideWinder joystick family driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * These are really magic values. Changing them can make a problem go away,
+ * as well as break everything.
+ */
+
+#undef SW_DEBUG
+#undef SW_DEBUG_DATA
+
+#define SW_START	600	/* The time we wait for the first bit [600 us] */
+#define SW_STROBE	60	/* Max time per bit [60 us] */
+#define SW_TIMEOUT	6	/* Wait for everything to settle [6 ms] */
+#define SW_KICK		45	/* Wait after A0 fall till kick [45 us] */
+#define SW_END		8	/* Number of bits before end of packet to kick */
+#define SW_FAIL		16	/* Number of packet read errors to fail and reinitialize */
+#define SW_BAD		2	/* Number of packet read errors to switch off 3d Pro optimization */
+#define SW_OK		64	/* Number of packet read successes to switch optimization back on */
+#define SW_LENGTH	512	/* Max number of bits in a packet */
+
+#ifdef SW_DEBUG
+#define dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+
+/*
+ * SideWinder joystick types ...
+ */
+
+#define SW_ID_3DP	0
+#define SW_ID_GP	1
+#define SW_ID_PP	2
+#define SW_ID_FFP	3
+#define SW_ID_FSP	4
+#define SW_ID_FFW	5
+
+/*
+ * Names, buttons, axes ...
+ */
+
+static char *sw_name[] = {	"3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
+				"Force Feedback Wheel" };
+
+static char sw_abs[][7] = {
+	{ ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_X, ABS_Y },
+	{ ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_X, ABS_Y,         ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_RX, ABS_RUDDER,   ABS_THROTTLE }};
+
+static char sw_bit[][7] = {
+	{ 10, 10,  9, 10,  1,  1 },
+	{  1,  1                 },
+	{ 10, 10,  6,  7,  1,  1 },
+	{ 10, 10,  6,  7,  1,  1 },
+	{ 10, 10,  6,  1,  1     },
+	{ 10,  7,  7,  1,  1     }};
+
+static short sw_btn[][12] = {
+	{ BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_MODE },
+	{ BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE },
+	{ BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
+	{ BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
+	{ BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE, BTN_SELECT },
+	{ BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 }};
+
+static struct {
+	int x;
+	int y;
+} sw_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
+
+struct sw {
+	struct gameport *gameport;
+	struct input_dev *dev[4];
+	char name[64];
+	char phys[4][32];
+	int length;
+	int type;
+	int bits;
+	int number;
+	int fail;
+	int ok;
+	int reads;
+	int bads;
+};
+
+/*
+ * sw_read_packet() is a function which reads either a data packet, or an
+ * identification packet from a SideWinder joystick. The protocol is very,
+ * very, very braindamaged. Microsoft patented it in US patent #5628686.
+ */
+
+static int sw_read_packet(struct gameport *gameport, unsigned char *buf, int length, int id)
+{
+	unsigned long flags;
+	int timeout, bitout, sched, i, kick, start, strobe;
+	unsigned char pending, u, v;
+
+	i = -id;						/* Don't care about data, only want ID */
+	timeout = id ? gameport_time(gameport, SW_TIMEOUT * 1000) : 0; /* Set up global timeout for ID packet */
+	kick = id ? gameport_time(gameport, SW_KICK) : 0;	/* Set up kick timeout for ID packet */
+	start = gameport_time(gameport, SW_START);
+	strobe = gameport_time(gameport, SW_STROBE);
+	bitout = start;
+	pending = 0;
+	sched = 0;
+
+        local_irq_save(flags);					/* Quiet, please */
+
+	gameport_trigger(gameport);				/* Trigger */
+	v = gameport_read(gameport);
+
+	do {
+		bitout--;
+		u = v;
+		v = gameport_read(gameport);
+	} while (!(~v & u & 0x10) && (bitout > 0));		/* Wait for first falling edge on clock */
+
+	if (bitout > 0)
+		bitout = strobe;				/* Extend time if not timed out */
+
+	while ((timeout > 0 || bitout > 0) && (i < length)) {
+
+		timeout--;
+		bitout--;					/* Decrement timers */
+		sched--;
+
+		u = v;
+		v = gameport_read(gameport);
+
+		if ((~u & v & 0x10) && (bitout > 0)) {		/* Rising edge on clock - data bit */
+			if (i >= 0)				/* Want this data */
+				buf[i] = v >> 5;		/* Store it */
+			i++;					/* Advance index */
+			bitout = strobe;			/* Extend timeout for next bit */
+		}
+
+		if (kick && (~v & u & 0x01)) {			/* Falling edge on axis 0 */
+			sched = kick;				/* Schedule second trigger */
+			kick = 0;				/* Don't schedule next time on falling edge */
+			pending = 1;				/* Mark schedule */
+		}
+
+		if (pending && sched < 0 && (i > -SW_END)) {	/* Second trigger time */
+			gameport_trigger(gameport);		/* Trigger */
+			bitout = start;				/* Long bit timeout */
+			pending = 0;				/* Unmark schedule */
+			timeout = 0;				/* Switch from global to bit timeouts */
+		}
+	}
+
+	local_irq_restore(flags);					/* Done - relax */
+
+#ifdef SW_DEBUG_DATA
+	{
+		int j;
+		printk(KERN_DEBUG "sidewinder.c: Read %d triplets. [", i);
+		for (j = 0; j < i; j++) printk("%d", buf[j]);
+		printk("]\n");
+	}
+#endif
+
+	return i;
+}
+
+/*
+ * sw_get_bits() and GB() compose bits from the triplet buffer into a __u64.
+ * Parameter 'pos' is bit number inside packet where to start at, 'num' is number
+ * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits
+ * is number of bits per triplet.
+ */
+
+#define GB(pos,num) sw_get_bits(buf, pos, num, sw->bits)
+
+static __u64 sw_get_bits(unsigned char *buf, int pos, int num, char bits)
+{
+	__u64 data = 0;
+	int tri = pos % bits;						/* Start position */
+	int i   = pos / bits;
+	int bit = 0;
+
+	while (num--) {
+		data |= (__u64)((buf[i] >> tri++) & 1) << bit++;	/* Transfer bit */
+		if (tri == bits) {
+			i++;						/* Next triplet */
+			tri = 0;
+		}
+	}
+
+	return data;
+}
+
+/*
+ * sw_init_digital() initializes a SideWinder 3D Pro joystick
+ * into digital mode.
+ */
+
+static void sw_init_digital(struct gameport *gameport)
+{
+	static const int seq[] = { 140, 140+725, 140+300, 0 };
+	unsigned long flags;
+	int i, t;
+
+        local_irq_save(flags);
+
+	i = 0;
+        do {
+                gameport_trigger(gameport);			/* Trigger */
+		t = gameport_time(gameport, SW_TIMEOUT * 1000);
+		while ((gameport_read(gameport) & 1) && t) t--;	/* Wait for axis to fall back to 0 */
+                udelay(seq[i]);					/* Delay magic time */
+        } while (seq[++i]);
+
+	gameport_trigger(gameport);				/* Last trigger */
+
+	local_irq_restore(flags);
+}
+
+/*
+ * sw_parity() computes parity of __u64
+ */
+
+static int sw_parity(__u64 t)
+{
+	int x = t ^ (t >> 32);
+
+	x ^= x >> 16;
+	x ^= x >> 8;
+	x ^= x >> 4;
+	x ^= x >> 2;
+	x ^= x >> 1;
+	return x & 1;
+}
+
+/*
+ * sw_ccheck() checks synchronization bits and computes checksum of nibbles.
+ */
+
+static int sw_check(__u64 t)
+{
+	unsigned char sum = 0;
+
+	if ((t & 0x8080808080808080ULL) ^ 0x80)			/* Sync */
+		return -1;
+
+	while (t) {						/* Sum */
+		sum += t & 0xf;
+		t >>= 4;
+	}
+
+	return sum & 0xf;
+}
+
+/*
+ * sw_parse() analyzes SideWinder joystick data, and writes the results into
+ * the axes and buttons arrays.
+ */
+
+static int sw_parse(unsigned char *buf, struct sw *sw)
+{
+	int hat, i, j;
+	struct input_dev *dev;
+
+	switch (sw->type) {
+
+		case SW_ID_3DP:
+
+			if (sw_check(GB(0,64)) || (hat = (GB(6,1) << 3) | GB(60,3)) > 8)
+				return -1;
+
+			dev = sw->dev[0];
+
+			input_report_abs(dev, ABS_X,        (GB( 3,3) << 7) | GB(16,7));
+			input_report_abs(dev, ABS_Y,        (GB( 0,3) << 7) | GB(24,7));
+			input_report_abs(dev, ABS_RZ,       (GB(35,2) << 7) | GB(40,7));
+			input_report_abs(dev, ABS_THROTTLE, (GB(32,3) << 7) | GB(48,7));
+
+			input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+			input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+			for (j = 0; j < 7; j++)
+				input_report_key(dev, sw_btn[SW_ID_3DP][j], !GB(j+8,1));
+
+			input_report_key(dev, BTN_BASE4, !GB(38,1));
+			input_report_key(dev, BTN_BASE5, !GB(37,1));
+
+			input_sync(dev);
+
+			return 0;
+
+		case SW_ID_GP:
+
+			for (i = 0; i < sw->number; i ++) {
+
+				if (sw_parity(GB(i*15,15)))
+					return -1;
+
+				input_report_abs(sw->dev[i], ABS_X, GB(i*15+3,1) - GB(i*15+2,1));
+				input_report_abs(sw->dev[i], ABS_Y, GB(i*15+0,1) - GB(i*15+1,1));
+
+				for (j = 0; j < 10; j++)
+					input_report_key(sw->dev[i], sw_btn[SW_ID_GP][j], !GB(i*15+j+4,1));
+
+				input_sync(sw->dev[i]);
+			}
+
+			return 0;
+
+		case SW_ID_PP:
+		case SW_ID_FFP:
+
+			if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8)
+				return -1;
+
+			dev = sw->dev[0];
+			input_report_abs(dev, ABS_X,        GB( 9,10));
+			input_report_abs(dev, ABS_Y,        GB(19,10));
+			input_report_abs(dev, ABS_RZ,       GB(36, 6));
+			input_report_abs(dev, ABS_THROTTLE, GB(29, 7));
+
+			input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+			input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+			for (j = 0; j < 9; j++)
+				input_report_key(dev, sw_btn[SW_ID_PP][j], !GB(j,1));
+
+			input_sync(dev);
+
+			return 0;
+
+		case SW_ID_FSP:
+
+			if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8)
+				return -1;
+
+			dev = sw->dev[0];
+			input_report_abs(dev, ABS_X,        GB( 0,10));
+			input_report_abs(dev, ABS_Y,        GB(16,10));
+			input_report_abs(dev, ABS_THROTTLE, GB(32, 6));
+
+			input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+			input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+			for (j = 0; j < 6; j++)
+				input_report_key(dev, sw_btn[SW_ID_FSP][j], !GB(j+10,1));
+
+			input_report_key(dev, BTN_TR,     !GB(26,1));
+			input_report_key(dev, BTN_START,  !GB(27,1));
+			input_report_key(dev, BTN_MODE,   !GB(38,1));
+			input_report_key(dev, BTN_SELECT, !GB(39,1));
+
+			input_sync(dev);
+
+			return 0;
+
+		case SW_ID_FFW:
+
+			if (!sw_parity(GB(0,33)))
+				return -1;
+
+			dev = sw->dev[0];
+			input_report_abs(dev, ABS_RX,       GB( 0,10));
+			input_report_abs(dev, ABS_RUDDER,   GB(10, 6));
+			input_report_abs(dev, ABS_THROTTLE, GB(16, 6));
+
+			for (j = 0; j < 8; j++)
+				input_report_key(dev, sw_btn[SW_ID_FFW][j], !GB(j+22,1));
+
+			input_sync(dev);
+
+			return 0;
+	}
+
+	return -1;
+}
+
+/*
+ * sw_read() reads SideWinder joystick data, and reinitializes
+ * the joystick in case of persistent problems. This is the function that is
+ * called from the generic code to poll the joystick.
+ */
+
+static int sw_read(struct sw *sw)
+{
+	unsigned char buf[SW_LENGTH];
+	int i;
+
+	i = sw_read_packet(sw->gameport, buf, sw->length, 0);
+
+	if (sw->type == SW_ID_3DP && sw->length == 66 && i != 66) {		/* Broken packet, try to fix */
+
+		if (i == 64 && !sw_check(sw_get_bits(buf,0,64,1))) {		/* Last init failed, 1 bit mode */
+			printk(KERN_WARNING "sidewinder.c: Joystick in wrong mode on %s"
+				" - going to reinitialize.\n", sw->gameport->phys);
+			sw->fail = SW_FAIL;					/* Reinitialize */
+			i = 128;						/* Bogus value */
+		}
+
+		if (i < 66 && GB(0,64) == GB(i*3-66,64))			/* 1 == 3 */
+			i = 66;							/* Everything is fine */
+
+		if (i < 66 && GB(0,64) == GB(66,64))				/* 1 == 2 */
+			i = 66;							/* Everything is fine */
+
+		if (i < 66 && GB(i*3-132,64) == GB(i*3-66,64)) {		/* 2 == 3 */
+			memmove(buf, buf + i - 22, 22);				/* Move data */
+			i = 66;							/* Carry on */
+		}
+	}
+
+	if (i == sw->length && !sw_parse(buf, sw)) {				/* Parse data */
+
+		sw->fail = 0;
+		sw->ok++;
+
+		if (sw->type == SW_ID_3DP && sw->length == 66			/* Many packets OK */
+			&& sw->ok > SW_OK) {
+
+			printk(KERN_INFO "sidewinder.c: No more trouble on %s"
+				" - enabling optimization again.\n", sw->gameport->phys);
+			sw->length = 22;
+		}
+
+		return 0;
+	}
+
+	sw->ok = 0;
+	sw->fail++;
+
+	if (sw->type == SW_ID_3DP && sw->length == 22 && sw->fail > SW_BAD) {	/* Consecutive bad packets */
+
+		printk(KERN_INFO "sidewinder.c: Many bit errors on %s"
+			" - disabling optimization.\n", sw->gameport->phys);
+		sw->length = 66;
+	}
+
+	if (sw->fail < SW_FAIL)
+		return -1;							/* Not enough, don't reinitialize yet */
+
+	printk(KERN_WARNING "sidewinder.c: Too many bit errors on %s"
+		" - reinitializing joystick.\n", sw->gameport->phys);
+
+	if (!i && sw->type == SW_ID_3DP) {					/* 3D Pro can be in analog mode */
+		mdelay(3 * SW_TIMEOUT);
+		sw_init_digital(sw->gameport);
+	}
+
+	mdelay(SW_TIMEOUT);
+	i = sw_read_packet(sw->gameport, buf, SW_LENGTH, 0);			/* Read normal data packet */
+	mdelay(SW_TIMEOUT);
+	sw_read_packet(sw->gameport, buf, SW_LENGTH, i);			/* Read ID packet, this initializes the stick */
+
+	sw->fail = SW_FAIL;
+
+	return -1;
+}
+
+static void sw_poll(struct gameport *gameport)
+{
+	struct sw *sw = gameport_get_drvdata(gameport);
+
+	sw->reads++;
+	if (sw_read(sw))
+		sw->bads++;
+}
+
+static int sw_open(struct input_dev *dev)
+{
+	struct sw *sw = input_get_drvdata(dev);
+
+	gameport_start_polling(sw->gameport);
+	return 0;
+}
+
+static void sw_close(struct input_dev *dev)
+{
+	struct sw *sw = input_get_drvdata(dev);
+
+	gameport_stop_polling(sw->gameport);
+}
+
+/*
+ * sw_print_packet() prints the contents of a SideWinder packet.
+ */
+
+static void sw_print_packet(char *name, int length, unsigned char *buf, char bits)
+{
+	int i;
+
+	printk(KERN_INFO "sidewinder.c: %s packet, %d bits. [", name, length);
+	for (i = (((length + 3) >> 2) - 1); i >= 0; i--)
+		printk("%x", (int)sw_get_bits(buf, i << 2, 4, bits));
+	printk("]\n");
+}
+
+/*
+ * sw_3dp_id() translates the 3DP id into a human legible string.
+ * Unfortunately I don't know how to do this for the other SW types.
+ */
+
+static void sw_3dp_id(unsigned char *buf, char *comment, size_t size)
+{
+	int i;
+	char pnp[8], rev[9];
+
+	for (i = 0; i < 7; i++)						/* ASCII PnP ID */
+		pnp[i] = sw_get_bits(buf, 24+8*i, 8, 1);
+
+	for (i = 0; i < 8; i++)						/* ASCII firmware revision */
+		rev[i] = sw_get_bits(buf, 88+8*i, 8, 1);
+
+	pnp[7] = rev[8] = 0;
+
+	snprintf(comment, size, " [PnP %d.%02d id %s rev %s]",
+		(int) ((sw_get_bits(buf, 8, 6, 1) << 6) |		/* Two 6-bit values */
+			sw_get_bits(buf, 16, 6, 1)) / 100,
+		(int) ((sw_get_bits(buf, 8, 6, 1) << 6) |
+			sw_get_bits(buf, 16, 6, 1)) % 100,
+		 pnp, rev);
+}
+
+/*
+ * sw_guess_mode() checks the upper two button bits for toggling -
+ * indication of that the joystick is in 3-bit mode. This is documented
+ * behavior for 3DP ID packet, and for example the FSP does this in
+ * normal packets instead. Fun ...
+ */
+
+static int sw_guess_mode(unsigned char *buf, int len)
+{
+	int i;
+	unsigned char xor = 0;
+
+	for (i = 1; i < len; i++)
+		xor |= (buf[i - 1] ^ buf[i]) & 6;
+
+	return !!xor * 2 + 1;
+}
+
+/*
+ * sw_connect() probes for SideWinder type joysticks.
+ */
+
+static int sw_connect(struct gameport *gameport, struct gameport_driver *drv)
+{
+	struct sw *sw;
+	struct input_dev *input_dev;
+	int i, j, k, l;
+	int err = 0;
+	unsigned char *buf = NULL;	/* [SW_LENGTH] */
+	unsigned char *idbuf = NULL;	/* [SW_LENGTH] */
+	unsigned char m = 1;
+	char comment[40];
+
+	comment[0] = 0;
+
+	sw = kzalloc_obj(*sw);
+	buf = kmalloc(SW_LENGTH, GFP_KERNEL);
+	idbuf = kmalloc(SW_LENGTH, GFP_KERNEL);
+	if (!sw || !buf || !idbuf) {
+		err = -ENOMEM;
+		goto fail1;
+	}
+
+	sw->gameport = gameport;
+
+	gameport_set_drvdata(gameport, sw);
+
+	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
+	if (err)
+		goto fail1;
+
+	dbg("Init 0: Opened %s, io %#x, speed %d",
+		gameport->phys, gameport->io, gameport->speed);
+
+	i = sw_read_packet(gameport, buf, SW_LENGTH, 0);		/* Read normal packet */
+	msleep(SW_TIMEOUT);
+	dbg("Init 1: Mode %d. Length %d.", m , i);
+
+	if (!i) {							/* No data. 3d Pro analog mode? */
+		sw_init_digital(gameport);				/* Switch to digital */
+		msleep(SW_TIMEOUT);
+		i = sw_read_packet(gameport, buf, SW_LENGTH, 0);	/* Retry reading packet */
+		msleep(SW_TIMEOUT);
+		dbg("Init 1b: Length %d.", i);
+		if (!i) {						/* No data -> FAIL */
+			err = -ENODEV;
+			goto fail2;
+		}
+	}
+
+	j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);		/* Read ID. This initializes the stick */
+	m |= sw_guess_mode(idbuf, j);					/* ID packet should carry mode info [3DP] */
+	dbg("Init 2: Mode %d. ID Length %d.", m, j);
+
+	if (j <= 0) {							/* Read ID failed. Happens in 1-bit mode on PP */
+		msleep(SW_TIMEOUT);
+		i = sw_read_packet(gameport, buf, SW_LENGTH, 0);	/* Retry reading packet */
+		m |= sw_guess_mode(buf, i);
+		dbg("Init 2b: Mode %d. Length %d.", m, i);
+		if (!i) {
+			err = -ENODEV;
+			goto fail2;
+		}
+		msleep(SW_TIMEOUT);
+		j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);	/* Retry reading ID */
+		dbg("Init 2c: ID Length %d.", j);
+	}
+
+	sw->type = -1;
+	k = SW_FAIL;							/* Try SW_FAIL times */
+	l = 0;
+
+	do {
+		k--;
+		msleep(SW_TIMEOUT);
+		i = sw_read_packet(gameport, buf, SW_LENGTH, 0);	/* Read data packet */
+		dbg("Init 3: Mode %d. Length %d. Last %d. Tries %d.", m, i, l, k);
+
+		if (i > l) {						/* Longer? As we can only lose bits, it makes */
+									/* no sense to try detection for a packet shorter */
+			l = i;						/* than the previous one */
+
+			sw->number = 1;
+			sw->gameport = gameport;
+			sw->length = i;
+			sw->bits = m;
+
+			dbg("Init 3a: Case %d.\n", i * m);
+
+			switch (i * m) {
+				case 60:
+					sw->number++;
+					fallthrough;
+				case 45:				/* Ambiguous packet length */
+					if (j <= 40) {			/* ID length less or eq 40 -> FSP */
+					fallthrough;
+				case 43:
+						sw->type = SW_ID_FSP;
+						break;
+					}
+					sw->number++;
+					fallthrough;
+				case 30:
+					sw->number++;
+					fallthrough;
+				case 15:
+					sw->type = SW_ID_GP;
+					break;
+				case 33:
+				case 31:
+					sw->type = SW_ID_FFW;
+					break;
+				case 48:				/* Ambiguous */
+					if (j == 14) {			/* ID length 14*3 -> FFP */
+						sw->type = SW_ID_FFP;
+						sprintf(comment, " [AC %s]", str_off_on(sw_get_bits(idbuf,38,1,3)));
+					} else
+						sw->type = SW_ID_PP;
+					break;
+				case 66:
+					sw->bits = 3;
+					fallthrough;
+				case 198:
+					sw->length = 22;
+					fallthrough;
+				case 64:
+					sw->type = SW_ID_3DP;
+					if (j == 160)
+						sw_3dp_id(idbuf, comment, sizeof(comment));
+					break;
+			}
+		}
+
+	} while (k && sw->type == -1);
+
+	if (sw->type == -1) {
+		printk(KERN_WARNING "sidewinder.c: unknown joystick device detected "
+			"on %s, contact <vojtech@ucw.cz>\n", gameport->phys);
+		sw_print_packet("ID", j * 3, idbuf, 3);
+		sw_print_packet("Data", i * m, buf, m);
+		err = -ENODEV;
+		goto fail2;
+	}
+
+#ifdef SW_DEBUG
+	sw_print_packet("ID", j * 3, idbuf, 3);
+	sw_print_packet("Data", i * m, buf, m);
+#endif
+
+	gameport_set_poll_handler(gameport, sw_poll);
+	gameport_set_poll_interval(gameport, 20);
+
+	k = i;
+	l = j;
+
+	for (i = 0; i < sw->number; i++) {
+		int bits, code;
+
+		snprintf(sw->name, sizeof(sw->name),
+			 "Microsoft SideWinder %s", sw_name[sw->type]);
+		snprintf(sw->phys[i], sizeof(sw->phys[i]),
+			 "%s/input%d", gameport->phys, i);
+
+		sw->dev[i] = input_dev = input_allocate_device();
+		if (!input_dev) {
+			err = -ENOMEM;
+			goto fail3;
+		}
+
+		input_dev->name = sw->name;
+		input_dev->phys = sw->phys[i];
+		input_dev->id.bustype = BUS_GAMEPORT;
+		input_dev->id.vendor = GAMEPORT_ID_VENDOR_MICROSOFT;
+		input_dev->id.product = sw->type;
+		input_dev->id.version = 0x0100;
+		input_dev->dev.parent = &gameport->dev;
+
+		input_set_drvdata(input_dev, sw);
+
+		input_dev->open = sw_open;
+		input_dev->close = sw_close;
+
+		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+
+		for (j = 0; (bits = sw_bit[sw->type][j]); j++) {
+			int min, max, fuzz, flat;
+
+			code = sw_abs[sw->type][j];
+			min = bits == 1 ? -1 : 0;
+			max = (1 << bits) - 1;
+			fuzz = (bits >> 1) >= 2 ? 1 << ((bits >> 1) - 2) : 0;
+			flat = code == ABS_THROTTLE || bits < 5 ?
+				0 : 1 << (bits - 5);
+
+			input_set_abs_params(input_dev, code,
+					     min, max, fuzz, flat);
+		}
+
+		for (j = 0; (code = sw_btn[sw->type][j]); j++)
+			__set_bit(code, input_dev->keybit);
+
+		dbg("%s%s [%d-bit id %d data %d]\n", sw->name, comment, m, l, k);
+
+		err = input_register_device(sw->dev[i]);
+		if (err)
+			goto fail4;
+	}
+
+ out:	kfree(buf);
+	kfree(idbuf);
+
+	return err;
+
+ fail4:	input_free_device(sw->dev[i]);
+ fail3:	while (--i >= 0)
+		input_unregister_device(sw->dev[i]);
+ fail2:	gameport_close(gameport);
+ fail1:	gameport_set_drvdata(gameport, NULL);
+	kfree(sw);
+	goto out;
+}
+
+static void sw_disconnect(struct gameport *gameport)
+{
+	struct sw *sw = gameport_get_drvdata(gameport);
+	int i;
+
+	for (i = 0; i < sw->number; i++)
+		input_unregister_device(sw->dev[i]);
+	gameport_close(gameport);
+	gameport_set_drvdata(gameport, NULL);
+	kfree(sw);
+}
+
+static struct gameport_driver sw_drv = {
+	.driver		= {
+		.name	= "sidewinder",
+		.owner	= THIS_MODULE,
+	},
+	.description	= DRIVER_DESC,
+	.connect	= sw_connect,
+	.disconnect	= sw_disconnect,
+};
+
+module_gameport_driver(sw_drv);