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linuxdebug/drivers/input/joystick/analog.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 1996-2001 Vojtech Pavlik
*/
/*
* Analog joystick and gamepad driver for Linux
*/
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/gameport.h>
#include <linux/jiffies.h>
#include <linux/seq_buf.h>
#include <linux/timex.h>
#include <linux/timekeeping.h>
#define DRIVER_DESC "Analog joystick and gamepad driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/*
* Option parsing.
*/
#define ANALOG_PORTS 16
static char *js[ANALOG_PORTS];
static unsigned int js_nargs;
static int analog_options[ANALOG_PORTS];
module_param_array_named(map, js, charp, &js_nargs, 0);
MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");
/*
* Times, feature definitions.
*/
#define ANALOG_RUDDER 0x00004
#define ANALOG_THROTTLE 0x00008
#define ANALOG_AXES_STD 0x0000f
#define ANALOG_BTNS_STD 0x000f0
#define ANALOG_BTNS_CHF 0x00100
#define ANALOG_HAT1_CHF 0x00200
#define ANALOG_HAT2_CHF 0x00400
#define ANALOG_HAT_FCS 0x00800
#define ANALOG_HATS_ALL 0x00e00
#define ANALOG_BTN_TL 0x01000
#define ANALOG_BTN_TR 0x02000
#define ANALOG_BTN_TL2 0x04000
#define ANALOG_BTN_TR2 0x08000
#define ANALOG_BTNS_TLR 0x03000
#define ANALOG_BTNS_TLR2 0x0c000
#define ANALOG_BTNS_GAMEPAD 0x0f000
#define ANALOG_HBTN_CHF 0x10000
#define ANALOG_ANY_CHF 0x10700
#define ANALOG_SAITEK 0x20000
#define ANALOG_EXTENSIONS 0x7ff00
#define ANALOG_GAMEPAD 0x80000
#define ANALOG_MAX_TIME 3 /* 3 ms */
#define ANALOG_LOOP_TIME 2000 /* 2 * loop */
#define ANALOG_SAITEK_DELAY 200 /* 200 us */
#define ANALOG_SAITEK_TIME 2000 /* 2000 us */
#define ANALOG_AXIS_TIME 2 /* 2 * refresh */
#define ANALOG_INIT_RETRIES 8 /* 8 times */
#define ANALOG_FUZZ_BITS 2 /* 2 bit more */
#define ANALOG_FUZZ_MAGIC 36 /* 36 u*ms/loop */
#define ANALOG_MAX_NAME_LENGTH 128
#define ANALOG_MAX_PHYS_LENGTH 32
static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };
static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };
struct analog {
struct input_dev *dev;
int mask;
short *buttons;
char name[ANALOG_MAX_NAME_LENGTH];
char phys[ANALOG_MAX_PHYS_LENGTH];
};
struct analog_port {
struct gameport *gameport;
struct analog analog[2];
unsigned char mask;
char saitek;
char cooked;
int bads;
int reads;
int loop;
int fuzz;
int axes[4];
int buttons;
int initial[4];
int axtime;
};
/*
* analog_decode() decodes analog joystick data and reports input events.
*/
static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
{
struct input_dev *dev = analog->dev;
int i, j;
if (analog->mask & ANALOG_HAT_FCS)
for (i = 0; i < 4; i++)
if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
buttons |= 1 << (i + 14);
break;
}
for (i = j = 0; i < 6; i++)
if (analog->mask & (0x10 << i))
input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);
if (analog->mask & ANALOG_HBTN_CHF)
for (i = 0; i < 4; i++)
input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);
if (analog->mask & ANALOG_BTN_TL)
input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
if (analog->mask & ANALOG_BTN_TR)
input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
if (analog->mask & ANALOG_BTN_TL2)
input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
if (analog->mask & ANALOG_BTN_TR2)
input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));
for (i = j = 0; i < 4; i++)
if (analog->mask & (1 << i))
input_report_abs(dev, analog_axes[j++], axes[i]);
for (i = j = 0; i < 3; i++)
if (analog->mask & analog_exts[i]) {
input_report_abs(dev, analog_hats[j++],
((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
input_report_abs(dev, analog_hats[j++],
((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
}
input_sync(dev);
}
/*
* analog_cooked_read() reads analog joystick data.
*/
static int analog_cooked_read(struct analog_port *port)
{
struct gameport *gameport = port->gameport;
ktime_t time[4], start, loop, now;
unsigned int loopout, timeout;
unsigned char data[4], this, last;
unsigned long flags;
int i, j;
loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
timeout = ANALOG_MAX_TIME * NSEC_PER_MSEC;
local_irq_save(flags);
gameport_trigger(gameport);
now = ktime_get();
local_irq_restore(flags);
start = now;
this = port->mask;
i = 0;
do {
loop = now;
last = this;
local_irq_disable();
this = gameport_read(gameport) & port->mask;
now = ktime_get();
local_irq_restore(flags);
if ((last ^ this) && (ktime_sub(now, loop) < loopout)) {
data[i] = last ^ this;
time[i] = now;
i++;
}
} while (this && (i < 4) && (ktime_sub(now, start) < timeout));
this <<= 4;
for (--i; i >= 0; i--) {
this |= data[i];
for (j = 0; j < 4; j++)
if (data[i] & (1 << j))
port->axes[j] = ((u32)ktime_sub(time[i], start) << ANALOG_FUZZ_BITS) / port->loop;
}
return -(this != port->mask);
}
static int analog_button_read(struct analog_port *port, char saitek, char chf)
{
unsigned char u;
int t = 1, i = 0;
int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);
u = gameport_read(port->gameport);
if (!chf) {
port->buttons = (~u >> 4) & 0xf;
return 0;
}
port->buttons = 0;
while ((~u & 0xf0) && (i < 16) && t) {
port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
if (!saitek) return 0;
udelay(ANALOG_SAITEK_DELAY);
t = strobe;
gameport_trigger(port->gameport);
while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
i++;
}
return -(!t || (i == 16));
}
/*
* analog_poll() repeatedly polls the Analog joysticks.
*/
static void analog_poll(struct gameport *gameport)
{
struct analog_port *port = gameport_get_drvdata(gameport);
int i;
char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);
if (port->cooked) {
port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
if (chf)
port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
port->reads++;
} else {
if (!port->axtime--) {
port->bads -= analog_cooked_read(port);
port->bads -= analog_button_read(port, saitek, chf);
port->reads++;
port->axtime = ANALOG_AXIS_TIME - 1;
} else {
if (!saitek)
analog_button_read(port, saitek, chf);
}
}
for (i = 0; i < 2; i++)
if (port->analog[i].mask)
analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
}
/*
* analog_open() is a callback from the input open routine.
*/
static int analog_open(struct input_dev *dev)
{
struct analog_port *port = input_get_drvdata(dev);
gameport_start_polling(port->gameport);
return 0;
}
/*
* analog_close() is a callback from the input close routine.
*/
static void analog_close(struct input_dev *dev)
{
struct analog_port *port = input_get_drvdata(dev);
gameport_stop_polling(port->gameport);
}
/*
* analog_calibrate_timer() calibrates the timer and computes loop
* and timeout values for a joystick port.
*/
static void analog_calibrate_timer(struct analog_port *port)
{
struct gameport *gameport = port->gameport;
unsigned int i, t, tx;
ktime_t t1, t2, t3;
unsigned long flags;
tx = ~0;
for (i = 0; i < 50; i++) {
local_irq_save(flags);
t1 = ktime_get();
for (t = 0; t < 50; t++) {
gameport_read(gameport);
t2 = ktime_get();
}
t3 = ktime_get();
local_irq_restore(flags);
udelay(i);
t = ktime_sub(t2, t1) - ktime_sub(t3, t2);
if (t < tx) tx = t;
}
port->loop = tx / 50;
}
/*
* analog_name() constructs a name for an analog joystick.
*/
static void analog_name(struct analog *analog)
{
struct seq_buf s;
seq_buf_init(&s, analog->name, sizeof(analog->name));
seq_buf_printf(&s, "Analog %d-axis %d-button",
hweight8(analog->mask & ANALOG_AXES_STD),
hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);
if (analog->mask & ANALOG_HATS_ALL)
seq_buf_printf(&s, " %d-hat",
hweight16(analog->mask & ANALOG_HATS_ALL));
if (analog->mask & ANALOG_HAT_FCS)
seq_buf_printf(&s, " FCS");
if (analog->mask & ANALOG_ANY_CHF)
seq_buf_printf(&s, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF");
seq_buf_printf(&s, (analog->mask & ANALOG_GAMEPAD) ? " gamepad" : " joystick");
}
/*
* analog_init_device()
*/
static int analog_init_device(struct analog_port *port, struct analog *analog, int index)
{
struct input_dev *input_dev;
int i, j, t, v, w, x, y, z;
int error;
analog_name(analog);
snprintf(analog->phys, sizeof(analog->phys),
"%s/input%d", port->gameport->phys, index);
analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;
analog->dev = input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
input_dev->name = analog->name;
input_dev->phys = analog->phys;
input_dev->id.bustype = BUS_GAMEPORT;
input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
input_dev->id.product = analog->mask >> 4;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &port->gameport->dev;
input_set_drvdata(input_dev, port);
input_dev->open = analog_open;
input_dev->close = analog_close;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
for (i = j = 0; i < 4; i++)
if (analog->mask & (1 << i)) {
t = analog_axes[j];
x = port->axes[i];
y = (port->axes[0] + port->axes[1]) >> 1;
z = y - port->axes[i];
z = z > 0 ? z : -z;
v = (x >> 3);
w = (x >> 3);
if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
x = y;
if (analog->mask & ANALOG_SAITEK) {
if (i == 2) x = port->axes[i];
v = x - (x >> 2);
w = (x >> 4);
}
input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
j++;
}
for (i = j = 0; i < 3; i++)
if (analog->mask & analog_exts[i])
for (x = 0; x < 2; x++) {
t = analog_hats[j++];
input_set_abs_params(input_dev, t, -1, 1, 0, 0);
}
for (i = j = 0; i < 4; i++)
if (analog->mask & (0x10 << i))
set_bit(analog->buttons[j++], input_dev->keybit);
if (analog->mask & ANALOG_BTNS_CHF)
for (i = 0; i < 2; i++)
set_bit(analog->buttons[j++], input_dev->keybit);
if (analog->mask & ANALOG_HBTN_CHF)
for (i = 0; i < 4; i++)
set_bit(analog->buttons[j++], input_dev->keybit);
for (i = 0; i < 4; i++)
if (analog->mask & (ANALOG_BTN_TL << i))
set_bit(analog_pads[i], input_dev->keybit);
analog_decode(analog, port->axes, port->initial, port->buttons);
error = input_register_device(analog->dev);
if (error) {
input_free_device(analog->dev);
return error;
}
return 0;
}
/*
* analog_init_devices() sets up device-specific values and registers the input devices.
*/
static int analog_init_masks(struct analog_port *port)
{
int i;
struct analog *analog = port->analog;
int max[4];
if (!port->mask)
return -1;
if ((port->mask & 3) != 3 && port->mask != 0xc) {
printk(KERN_WARNING "analog.c: Unknown joystick device found "
"(data=%#x, %s), probably not analog joystick.\n",
port->mask, port->gameport->phys);
return -1;
}
i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */
analog[0].mask = i & 0xfffff;
analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
| port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
| ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);
analog[0].mask &= ~(ANALOG_HAT2_CHF)
| ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);
analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
| ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
| ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
| ((~analog[0].mask & ANALOG_HAT_FCS) << 4);
analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
| (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
& ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));
analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);
analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
: (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);
if (port->cooked) {
for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;
if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;
gameport_calibrate(port->gameport, port->axes, max);
}
for (i = 0; i < 4; i++)
port->initial[i] = port->axes[i];
return -!(analog[0].mask || analog[1].mask);
}
static int analog_init_port(struct gameport *gameport, struct gameport_driver *drv, struct analog_port *port)
{
int i, t, u, v;
port->gameport = gameport;
gameport_set_drvdata(gameport, port);
if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
analog_calibrate_timer(port);
gameport_trigger(gameport);
t = gameport_read(gameport);
msleep(ANALOG_MAX_TIME);
port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
port->fuzz = (NSEC_PER_MSEC * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;
for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
if (!analog_cooked_read(port))
break;
msleep(ANALOG_MAX_TIME);
}
u = v = 0;
msleep(ANALOG_MAX_TIME);
t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
gameport_trigger(gameport);
while ((gameport_read(port->gameport) & port->mask) && (u < t))
u++;
udelay(ANALOG_SAITEK_DELAY);
t = gameport_time(gameport, ANALOG_SAITEK_TIME);
gameport_trigger(gameport);
while ((gameport_read(port->gameport) & port->mask) && (v < t))
v++;
if (v < (u >> 1)) { /* FIXME - more than one port */
analog_options[0] |= /* FIXME - more than one port */
ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
return 0;
}
gameport_close(gameport);
}
if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
for (i = 0; i < ANALOG_INIT_RETRIES; i++)
if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
break;
for (i = 0; i < 4; i++)
if (port->axes[i] != -1)
port->mask |= 1 << i;
port->fuzz = gameport->fuzz;
port->cooked = 1;
return 0;
}
return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
}
static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)
{
struct analog_port *port;
int i;
int err;
if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
return -ENOMEM;
err = analog_init_port(gameport, drv, port);
if (err)
goto fail1;
err = analog_init_masks(port);
if (err)
goto fail2;
gameport_set_poll_handler(gameport, analog_poll);
gameport_set_poll_interval(gameport, 10);
for (i = 0; i < 2; i++)
if (port->analog[i].mask) {
err = analog_init_device(port, port->analog + i, i);
if (err)
goto fail3;
}
return 0;
fail3: while (--i >= 0)
if (port->analog[i].mask)
input_unregister_device(port->analog[i].dev);
fail2: gameport_close(gameport);
fail1: gameport_set_drvdata(gameport, NULL);
kfree(port);
return err;
}
static void analog_disconnect(struct gameport *gameport)
{
struct analog_port *port = gameport_get_drvdata(gameport);
int i;
for (i = 0; i < 2; i++)
if (port->analog[i].mask)
input_unregister_device(port->analog[i].dev);
gameport_close(gameport);
gameport_set_drvdata(gameport, NULL);
printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
port->gameport->phys);
kfree(port);
}
struct analog_types {
char *name;
int value;
};
static struct analog_types analog_types[] = {
{ "none", 0x00000000 },
{ "auto", 0x000000ff },
{ "2btn", 0x0000003f },
{ "y-joy", 0x0cc00033 },
{ "y-pad", 0x8cc80033 },
{ "fcs", 0x000008f7 },
{ "chf", 0x000002ff },
{ "fullchf", 0x000007ff },
{ "gamepad", 0x000830f3 },
{ "gamepad8", 0x0008f0f3 },
{ NULL, 0 }
};
static void analog_parse_options(void)
{
int i, j;
char *end;
for (i = 0; i < js_nargs; i++) {
for (j = 0; analog_types[j].name; j++)
if (!strcmp(analog_types[j].name, js[i])) {
analog_options[i] = analog_types[j].value;
break;
}
if (analog_types[j].name) continue;
analog_options[i] = simple_strtoul(js[i], &end, 0);
if (end != js[i]) continue;
analog_options[i] = 0xff;
if (!strlen(js[i])) continue;
printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
}
for (; i < ANALOG_PORTS; i++)
analog_options[i] = 0xff;
}
/*
* The gameport device structure.
*/
static struct gameport_driver analog_drv = {
.driver = {
.name = "analog",
},
.description = DRIVER_DESC,
.connect = analog_connect,
.disconnect = analog_disconnect,
};
static int __init analog_init(void)
{
analog_parse_options();
return gameport_register_driver(&analog_drv);
}
static void __exit analog_exit(void)
{
gameport_unregister_driver(&analog_drv);
}
module_init(analog_init);
module_exit(analog_exit);
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