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linuxdebug/drivers/input/joystick/grip_mp.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the Gravis Grip Multiport, a gamepad "hub" that
* connects up to four 9-pin digital gamepads/joysticks.
* Driver tested on SMP and UP kernel versions 2.4.18-4 and 2.4.18-5.
*
* Thanks to Chris Gassib for helpful advice.
*
* Copyright (c) 2002 Brian Bonnlander, Bill Soudan
* Copyright (c) 1998-2000 Vojtech Pavlik
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/jiffies.h>
#define DRIVER_DESC "Gravis Grip Multiport driver"
MODULE_AUTHOR("Brian Bonnlander");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
#ifdef GRIP_DEBUG
#define dbg(format, arg...) printk(KERN_ERR __FILE__ ": " format "\n" , ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif
#define GRIP_MAX_PORTS 4
/*
* Grip multiport state
*/
struct grip_port {
struct input_dev *dev;
int mode;
int registered;
/* individual gamepad states */
int buttons;
int xaxes;
int yaxes;
int dirty; /* has the state been updated? */
};
struct grip_mp {
struct gameport *gameport;
struct grip_port *port[GRIP_MAX_PORTS];
int reads;
int bads;
};
/*
* Multiport packet interpretation
*/
#define PACKET_FULL 0x80000000 /* packet is full */
#define PACKET_IO_FAST 0x40000000 /* 3 bits per gameport read */
#define PACKET_IO_SLOW 0x20000000 /* 1 bit per gameport read */
#define PACKET_MP_MORE 0x04000000 /* multiport wants to send more */
#define PACKET_MP_DONE 0x02000000 /* multiport done sending */
/*
* Packet status code interpretation
*/
#define IO_GOT_PACKET 0x0100 /* Got a packet */
#define IO_MODE_FAST 0x0200 /* Used 3 data bits per gameport read */
#define IO_SLOT_CHANGE 0x0800 /* Multiport physical slot status changed */
#define IO_DONE 0x1000 /* Multiport is done sending packets */
#define IO_RETRY 0x4000 /* Try again later to get packet */
#define IO_RESET 0x8000 /* Force multiport to resend all packets */
/*
* Gamepad configuration data. Other 9-pin digital joystick devices
* may work with the multiport, so this may not be an exhaustive list!
* Commodore 64 joystick remains untested.
*/
#define GRIP_INIT_DELAY 2000 /* 2 ms */
#define GRIP_MODE_NONE 0
#define GRIP_MODE_RESET 1
#define GRIP_MODE_GP 2
#define GRIP_MODE_C64 3
static const int grip_btn_gp[] = { BTN_TR, BTN_TL, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, -1 };
static const int grip_btn_c64[] = { BTN_JOYSTICK, -1 };
static const int grip_abs_gp[] = { ABS_X, ABS_Y, -1 };
static const int grip_abs_c64[] = { ABS_X, ABS_Y, -1 };
static const int *grip_abs[] = { NULL, NULL, grip_abs_gp, grip_abs_c64 };
static const int *grip_btn[] = { NULL, NULL, grip_btn_gp, grip_btn_c64 };
static const char *grip_name[] = { NULL, NULL, "Gravis Grip Pad", "Commodore 64 Joystick" };
static const int init_seq[] = {
1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1 };
/* Maps multiport directional values to X,Y axis values (each axis encoded in 3 bits) */
static const int axis_map[] = { 5, 9, 1, 5, 6, 10, 2, 6, 4, 8, 0, 4, 5, 9, 1, 5 };
static int register_slot(int i, struct grip_mp *grip);
/*
* Returns whether an odd or even number of bits are on in pkt.
*/
static int bit_parity(u32 pkt)
{
int x = pkt ^ (pkt >> 16);
x ^= x >> 8;
x ^= x >> 4;
x ^= x >> 2;
x ^= x >> 1;
return x & 1;
}
/*
* Poll gameport; return true if all bits set in 'onbits' are on and
* all bits set in 'offbits' are off.
*/
static inline int poll_until(u8 onbits, u8 offbits, int u_sec, struct gameport* gp, u8 *data)
{
int i, nloops;
nloops = gameport_time(gp, u_sec);
for (i = 0; i < nloops; i++) {
*data = gameport_read(gp);
if ((*data & onbits) == onbits &&
(~(*data) & offbits) == offbits)
return 1;
}
dbg("gameport timed out after %d microseconds.\n", u_sec);
return 0;
}
/*
* Gets a 28-bit packet from the multiport.
*
* After getting a packet successfully, commands encoded by sendcode may
* be sent to the multiport.
*
* The multiport clock value is reflected in gameport bit B4.
*
* Returns a packet status code indicating whether packet is valid, the transfer
* mode, and any error conditions.
*
* sendflags: current I/O status
* sendcode: data to send to the multiport if sendflags is nonzero
*/
static int mp_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet)
{
u8 raw_data; /* raw data from gameport */
u8 data_mask; /* packet data bits from raw_data */
u32 pkt; /* packet temporary storage */
int bits_per_read; /* num packet bits per gameport read */
int portvals = 0; /* used for port value sanity check */
int i;
/* Gameport bits B0, B4, B5 should first be off, then B4 should come on. */
*packet = 0;
raw_data = gameport_read(gameport);
if (raw_data & 1)
return IO_RETRY;
for (i = 0; i < 64; i++) {
raw_data = gameport_read(gameport);
portvals |= 1 << ((raw_data >> 4) & 3); /* Demux B4, B5 */
}
if (portvals == 1) { /* B4, B5 off */
raw_data = gameport_read(gameport);
portvals = raw_data & 0xf0;
if (raw_data & 0x31)
return IO_RESET;
gameport_trigger(gameport);
if (!poll_until(0x10, 0, 308, gameport, &raw_data))
return IO_RESET;
} else
return IO_RETRY;
/* Determine packet transfer mode and prepare for packet construction. */
if (raw_data & 0x20) { /* 3 data bits/read */
portvals |= raw_data >> 4; /* Compare B4-B7 before & after trigger */
if (portvals != 0xb)
return 0;
data_mask = 7;
bits_per_read = 3;
pkt = (PACKET_FULL | PACKET_IO_FAST) >> 28;
} else { /* 1 data bit/read */
data_mask = 1;
bits_per_read = 1;
pkt = (PACKET_FULL | PACKET_IO_SLOW) >> 28;
}
/* Construct a packet. Final data bits must be zero. */
while (1) {
if (!poll_until(0, 0x10, 77, gameport, &raw_data))
return IO_RESET;
raw_data = (raw_data >> 5) & data_mask;
if (pkt & PACKET_FULL)
break;
pkt = (pkt << bits_per_read) | raw_data;
if (!poll_until(0x10, 0, 77, gameport, &raw_data))
return IO_RESET;
}
if (raw_data)
return IO_RESET;
/* If 3 bits/read used, drop from 30 bits to 28. */
if (bits_per_read == 3) {
pkt = (pkt & 0xffff0000) | ((pkt << 1) & 0xffff);
pkt = (pkt >> 2) | 0xf0000000;
}
if (bit_parity(pkt) == 1)
return IO_RESET;
/* Acknowledge packet receipt */
if (!poll_until(0x30, 0, 77, gameport, &raw_data))
return IO_RESET;
raw_data = gameport_read(gameport);
if (raw_data & 1)
return IO_RESET;
gameport_trigger(gameport);
if (!poll_until(0, 0x20, 77, gameport, &raw_data))
return IO_RESET;
/* Return if we just wanted the packet or multiport wants to send more */
*packet = pkt;
if ((sendflags == 0) || ((sendflags & IO_RETRY) && !(pkt & PACKET_MP_DONE)))
return IO_GOT_PACKET;
if (pkt & PACKET_MP_MORE)
return IO_GOT_PACKET | IO_RETRY;
/* Multiport is done sending packets and is ready to receive data */
if (!poll_until(0x20, 0, 77, gameport, &raw_data))
return IO_GOT_PACKET | IO_RESET;
raw_data = gameport_read(gameport);
if (raw_data & 1)
return IO_GOT_PACKET | IO_RESET;
/* Trigger gameport based on bits in sendcode */
gameport_trigger(gameport);
do {
if (!poll_until(0x20, 0x10, 116, gameport, &raw_data))
return IO_GOT_PACKET | IO_RESET;
if (!poll_until(0x30, 0, 193, gameport, &raw_data))
return IO_GOT_PACKET | IO_RESET;
if (raw_data & 1)
return IO_GOT_PACKET | IO_RESET;
if (sendcode & 1)
gameport_trigger(gameport);
sendcode >>= 1;
} while (sendcode);
return IO_GOT_PACKET | IO_MODE_FAST;
}
/*
* Disables and restores interrupts for mp_io(), which does the actual I/O.
*/
static int multiport_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet)
{
int status;
unsigned long flags;
local_irq_save(flags);
status = mp_io(gameport, sendflags, sendcode, packet);
local_irq_restore(flags);
return status;
}
/*
* Puts multiport into digital mode. Multiport LED turns green.
*
* Returns true if a valid digital packet was received, false otherwise.
*/
static int dig_mode_start(struct gameport *gameport, u32 *packet)
{
int i;
int flags, tries = 0, bads = 0;
for (i = 0; i < ARRAY_SIZE(init_seq); i++) { /* Send magic sequence */
if (init_seq[i])
gameport_trigger(gameport);
udelay(GRIP_INIT_DELAY);
}
for (i = 0; i < 16; i++) /* Wait for multiport to settle */
udelay(GRIP_INIT_DELAY);
while (tries < 64 && bads < 8) { /* Reset multiport and try getting a packet */
flags = multiport_io(gameport, IO_RESET, 0x27, packet);
if (flags & IO_MODE_FAST)
return 1;
if (flags & IO_RETRY)
tries++;
else
bads++;
}
return 0;
}
/*
* Packet structure: B0-B15 => gamepad state
* B16-B20 => gamepad device type
* B21-B24 => multiport slot index (1-4)
*
* Known device types: 0x1f (grip pad), 0x0 (no device). Others may exist.
*
* Returns the packet status.
*/
static int get_and_decode_packet(struct grip_mp *grip, int flags)
{
struct grip_port *port;
u32 packet;
int joytype = 0;
int slot;
/* Get a packet and check for validity */
flags &= IO_RESET | IO_RETRY;
flags = multiport_io(grip->gameport, flags, 0, &packet);
grip->reads++;
if (packet & PACKET_MP_DONE)
flags |= IO_DONE;
if (flags && !(flags & IO_GOT_PACKET)) {
grip->bads++;
return flags;
}
/* Ignore non-gamepad packets, e.g. multiport hardware version */
slot = ((packet >> 21) & 0xf) - 1;
if ((slot < 0) || (slot > 3))
return flags;
port = grip->port[slot];
/*
* Handle "reset" packets, which occur at startup, and when gamepads
* are removed or plugged in. May contain configuration of a new gamepad.
*/
joytype = (packet >> 16) & 0x1f;
if (!joytype) {
if (port->registered) {
printk(KERN_INFO "grip_mp: removing %s, slot %d\n",
grip_name[port->mode], slot);
input_unregister_device(port->dev);
port->registered = 0;
}
dbg("Reset: grip multiport slot %d\n", slot);
port->mode = GRIP_MODE_RESET;
flags |= IO_SLOT_CHANGE;
return flags;
}
/* Interpret a grip pad packet */
if (joytype == 0x1f) {
int dir = (packet >> 8) & 0xf; /* eight way directional value */
port->buttons = (~packet) & 0xff;
port->yaxes = ((axis_map[dir] >> 2) & 3) - 1;
port->xaxes = (axis_map[dir] & 3) - 1;
port->dirty = 1;
if (port->mode == GRIP_MODE_RESET)
flags |= IO_SLOT_CHANGE;
port->mode = GRIP_MODE_GP;
if (!port->registered) {
dbg("New Grip pad in multiport slot %d.\n", slot);
if (register_slot(slot, grip)) {
port->mode = GRIP_MODE_RESET;
port->dirty = 0;
}
}
return flags;
}
/* Handle non-grip device codes. For now, just print diagnostics. */
{
static int strange_code = 0;
if (strange_code != joytype) {
printk(KERN_INFO "Possible non-grip pad/joystick detected.\n");
printk(KERN_INFO "Got joy type 0x%x and packet 0x%x.\n", joytype, packet);
strange_code = joytype;
}
}
return flags;
}
/*
* Returns true if all multiport slot states appear valid.
*/
static int slots_valid(struct grip_mp *grip)
{
int flags, slot, invalid = 0, active = 0;
flags = get_and_decode_packet(grip, 0);
if (!(flags & IO_GOT_PACKET))
return 0;
for (slot = 0; slot < 4; slot++) {
if (grip->port[slot]->mode == GRIP_MODE_RESET)
invalid = 1;
if (grip->port[slot]->mode != GRIP_MODE_NONE)
active = 1;
}
/* Return true if no active slot but multiport sent all its data */
if (!active)
return (flags & IO_DONE) ? 1 : 0;
/* Return false if invalid device code received */
return invalid ? 0 : 1;
}
/*
* Returns whether the multiport was placed into digital mode and
* able to communicate its state successfully.
*/
static int multiport_init(struct grip_mp *grip)
{
int dig_mode, initialized = 0, tries = 0;
u32 packet;
dig_mode = dig_mode_start(grip->gameport, &packet);
while (!dig_mode && tries < 4) {
dig_mode = dig_mode_start(grip->gameport, &packet);
tries++;
}
if (dig_mode)
dbg("multiport_init(): digital mode activated.\n");
else {
dbg("multiport_init(): unable to activate digital mode.\n");
return 0;
}
/* Get packets, store multiport state, and check state's validity */
for (tries = 0; tries < 4096; tries++) {
if (slots_valid(grip)) {
initialized = 1;
break;
}
}
dbg("multiport_init(): initialized == %d\n", initialized);
return initialized;
}
/*
* Reports joystick state to the linux input layer.
*/
static void report_slot(struct grip_mp *grip, int slot)
{
struct grip_port *port = grip->port[slot];
int i;
/* Store button states with linux input driver */
for (i = 0; i < 8; i++)
input_report_key(port->dev, grip_btn_gp[i], (port->buttons >> i) & 1);
/* Store axis states with linux driver */
input_report_abs(port->dev, ABS_X, port->xaxes);
input_report_abs(port->dev, ABS_Y, port->yaxes);
/* Tell the receiver of the events to process them */
input_sync(port->dev);
port->dirty = 0;
}
/*
* Get the multiport state.
*/
static void grip_poll(struct gameport *gameport)
{
struct grip_mp *grip = gameport_get_drvdata(gameport);
int i, npkts, flags;
for (npkts = 0; npkts < 4; npkts++) {
flags = IO_RETRY;
for (i = 0; i < 32; i++) {
flags = get_and_decode_packet(grip, flags);
if ((flags & IO_GOT_PACKET) || !(flags & IO_RETRY))
break;
}
if (flags & IO_DONE)
break;
}
for (i = 0; i < 4; i++)
if (grip->port[i]->dirty)
report_slot(grip, i);
}
/*
* Called when a joystick device file is opened
*/
static int grip_open(struct input_dev *dev)
{
struct grip_mp *grip = input_get_drvdata(dev);
gameport_start_polling(grip->gameport);
return 0;
}
/*
* Called when a joystick device file is closed
*/
static void grip_close(struct input_dev *dev)
{
struct grip_mp *grip = input_get_drvdata(dev);
gameport_stop_polling(grip->gameport);
}
/*
* Tell the linux input layer about a newly plugged-in gamepad.
*/
static int register_slot(int slot, struct grip_mp *grip)
{
struct grip_port *port = grip->port[slot];
struct input_dev *input_dev;
int j, t;
int err;
port->dev = input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
input_dev->name = grip_name[port->mode];
input_dev->id.bustype = BUS_GAMEPORT;
input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
input_dev->id.product = 0x0100 + port->mode;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &grip->gameport->dev;
input_set_drvdata(input_dev, grip);
input_dev->open = grip_open;
input_dev->close = grip_close;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
for (j = 0; (t = grip_abs[port->mode][j]) >= 0; j++)
input_set_abs_params(input_dev, t, -1, 1, 0, 0);
for (j = 0; (t = grip_btn[port->mode][j]) >= 0; j++)
if (t > 0)
set_bit(t, input_dev->keybit);
err = input_register_device(port->dev);
if (err) {
input_free_device(port->dev);
return err;
}
port->registered = 1;
if (port->dirty) /* report initial state, if any */
report_slot(grip, slot);
return 0;
}
static int grip_connect(struct gameport *gameport, struct gameport_driver *drv)
{
struct grip_mp *grip;
int err;
if (!(grip = kzalloc(sizeof(struct grip_mp), GFP_KERNEL)))
return -ENOMEM;
grip->gameport = gameport;
gameport_set_drvdata(gameport, grip);
err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
if (err)
goto fail1;
gameport_set_poll_handler(gameport, grip_poll);
gameport_set_poll_interval(gameport, 20);
if (!multiport_init(grip)) {
err = -ENODEV;
goto fail2;
}
if (!grip->port[0]->mode && !grip->port[1]->mode && !grip->port[2]->mode && !grip->port[3]->mode) {
/* nothing plugged in */
err = -ENODEV;
goto fail2;
}
return 0;
fail2: gameport_close(gameport);
fail1: gameport_set_drvdata(gameport, NULL);
kfree(grip);
return err;
}
static void grip_disconnect(struct gameport *gameport)
{
struct grip_mp *grip = gameport_get_drvdata(gameport);
int i;
for (i = 0; i < 4; i++)
if (grip->port[i]->registered)
input_unregister_device(grip->port[i]->dev);
gameport_close(gameport);
gameport_set_drvdata(gameport, NULL);
kfree(grip);
}
static struct gameport_driver grip_drv = {
.driver = {
.name = "grip_mp",
},
.description = DRIVER_DESC,
.connect = grip_connect,
.disconnect = grip_disconnect,
};
module_gameport_driver(grip_drv);
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