[linux-block.git] / drivers / input / joystick / turbografx.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 1998-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *	Steffen Schwenke
 */

/*
 * TurboGraFX parallel port interface driver for Linux.
 */

#include <linux/kernel.h>
#include <linux/parport.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/slab.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("TurboGraFX parallel port interface driver");
MODULE_LICENSE("GPL");

#define TGFX_MAX_PORTS		3
#define TGFX_MAX_DEVICES	7

struct tgfx_config {
	int args[TGFX_MAX_DEVICES + 1];
	unsigned int nargs;
};

static struct tgfx_config tgfx_cfg[TGFX_MAX_PORTS];

module_param_array_named(map, tgfx_cfg[0].args, int, &tgfx_cfg[0].nargs, 0);
MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<js1>,<js2>,..<js7>");
module_param_array_named(map2, tgfx_cfg[1].args, int, &tgfx_cfg[1].nargs, 0);
MODULE_PARM_DESC(map2, "Describes second set of devices");
module_param_array_named(map3, tgfx_cfg[2].args, int, &tgfx_cfg[2].nargs, 0);
MODULE_PARM_DESC(map3, "Describes third set of devices");

#define TGFX_REFRESH_TIME	HZ/100	/* 10 ms */

#define TGFX_TRIGGER		0x08
#define TGFX_UP			0x10
#define TGFX_DOWN		0x20
#define TGFX_LEFT		0x40
#define TGFX_RIGHT		0x80

#define TGFX_THUMB		0x02
#define TGFX_THUMB2		0x04
#define TGFX_TOP		0x01
#define TGFX_TOP2		0x08

static int tgfx_buttons[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2 };

static struct tgfx {
	struct pardevice *pd;
	struct timer_list timer;
	struct input_dev *dev[TGFX_MAX_DEVICES];
	char name[TGFX_MAX_DEVICES][64];
	char phys[TGFX_MAX_DEVICES][32];
	int sticks;
	int used;
	int parportno;
	struct mutex sem;
} *tgfx_base[TGFX_MAX_PORTS];

/*
 * tgfx_timer() reads and analyzes TurboGraFX joystick data.
 */

static void tgfx_timer(struct timer_list *t)
{
	struct tgfx *tgfx = from_timer(tgfx, t, timer);
	struct input_dev *dev;
	int data1, data2, i;

	for (i = 0; i < 7; i++)
		if (tgfx->sticks & (1 << i)) {

			dev = tgfx->dev[i];

			parport_write_data(tgfx->pd->port, ~(1 << i));
			data1 = parport_read_status(tgfx->pd->port) ^ 0x7f;
			data2 = parport_read_control(tgfx->pd->port) ^ 0x04;	/* CAVEAT parport */

			input_report_abs(dev, ABS_X, !!(data1 & TGFX_RIGHT) - !!(data1 & TGFX_LEFT));
			input_report_abs(dev, ABS_Y, !!(data1 & TGFX_DOWN ) - !!(data1 & TGFX_UP  ));

			input_report_key(dev, BTN_TRIGGER, (data1 & TGFX_TRIGGER));
			input_report_key(dev, BTN_THUMB,   (data2 & TGFX_THUMB  ));
			input_report_key(dev, BTN_THUMB2,  (data2 & TGFX_THUMB2 ));
			input_report_key(dev, BTN_TOP,     (data2 & TGFX_TOP    ));
			input_report_key(dev, BTN_TOP2,    (data2 & TGFX_TOP2   ));

			input_sync(dev);
		}

	mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
}

static int tgfx_open(struct input_dev *dev)
{
	struct tgfx *tgfx = input_get_drvdata(dev);
	int err;

	err = mutex_lock_interruptible(&tgfx->sem);
	if (err)
		return err;

	if (!tgfx->used++) {
		parport_claim(tgfx->pd);
		parport_write_control(tgfx->pd->port, 0x04);
		mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
	}

	mutex_unlock(&tgfx->sem);
	return 0;
}

static void tgfx_close(struct input_dev *dev)
{
	struct tgfx *tgfx = input_get_drvdata(dev);

	mutex_lock(&tgfx->sem);
	if (!--tgfx->used) {
		del_timer_sync(&tgfx->timer);
		parport_write_control(tgfx->pd->port, 0x00);
		parport_release(tgfx->pd);
	}
	mutex_unlock(&tgfx->sem);
}


/*
 * tgfx_probe() probes for tg gamepads.
 */

static void tgfx_attach(struct parport *pp)
{
	struct tgfx *tgfx;
	struct input_dev *input_dev;
	struct pardevice *pd;
	int i, j, port_idx;
	int *n_buttons, n_devs;
	struct pardev_cb tgfx_parport_cb;

	for (port_idx = 0; port_idx < TGFX_MAX_PORTS; port_idx++) {
		if (tgfx_cfg[port_idx].nargs == 0 ||
		    tgfx_cfg[port_idx].args[0] < 0)
			continue;
		if (tgfx_cfg[port_idx].args[0] == pp->number)
			break;
	}

	if (port_idx == TGFX_MAX_PORTS) {
		pr_debug("Not using parport%d.\n", pp->number);
		return;
	}
	n_buttons = tgfx_cfg[port_idx].args + 1;
	n_devs = tgfx_cfg[port_idx].nargs - 1;

	memset(&tgfx_parport_cb, 0, sizeof(tgfx_parport_cb));
	tgfx_parport_cb.flags = PARPORT_FLAG_EXCL;

	pd = parport_register_dev_model(pp, "turbografx", &tgfx_parport_cb,
					port_idx);
	if (!pd) {
		pr_err("parport busy already - lp.o loaded?\n");
		return;
	}

	tgfx = kzalloc(sizeof(struct tgfx), GFP_KERNEL);
	if (!tgfx) {
		printk(KERN_ERR "turbografx.c: Not enough memory\n");
		goto err_unreg_pardev;
	}

	mutex_init(&tgfx->sem);
	tgfx->pd = pd;
	tgfx->parportno = pp->number;
	timer_setup(&tgfx->timer, tgfx_timer, 0);

	for (i = 0; i < n_devs; i++) {
		if (n_buttons[i] < 1)
			continue;

		if (n_buttons[i] > ARRAY_SIZE(tgfx_buttons)) {
			printk(KERN_ERR "turbografx.c: Invalid number of buttons %d\n", n_buttons[i]);
			goto err_unreg_devs;
		}

		tgfx->dev[i] = input_dev = input_allocate_device();
		if (!input_dev) {
			printk(KERN_ERR "turbografx.c: Not enough memory for input device\n");
			goto err_unreg_devs;
		}

		tgfx->sticks |= (1 << i);
		snprintf(tgfx->name[i], sizeof(tgfx->name[i]),
			 "TurboGraFX %d-button Multisystem joystick", n_buttons[i]);
		snprintf(tgfx->phys[i], sizeof(tgfx->phys[i]),
			 "%s/input%d", tgfx->pd->port->name, i);

		input_dev->name = tgfx->name[i];
		input_dev->phys = tgfx->phys[i];
		input_dev->id.bustype = BUS_PARPORT;
		input_dev->id.vendor = 0x0003;
		input_dev->id.product = n_buttons[i];
		input_dev->id.version = 0x0100;

		input_set_drvdata(input_dev, tgfx);

		input_dev->open = tgfx_open;
		input_dev->close = tgfx_close;

		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
		input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
		input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);

		for (j = 0; j < n_buttons[i]; j++)
			set_bit(tgfx_buttons[j], input_dev->keybit);

		if (input_register_device(tgfx->dev[i]))
			goto err_free_dev;
	}

        if (!tgfx->sticks) {
		printk(KERN_ERR "turbografx.c: No valid devices specified\n");
		goto err_free_tgfx;
        }

	tgfx_base[port_idx] = tgfx;
	return;

 err_free_dev:
	input_free_device(tgfx->dev[i]);
 err_unreg_devs:
	while (--i >= 0)
		if (tgfx->dev[i])
			input_unregister_device(tgfx->dev[i]);
 err_free_tgfx:
	kfree(tgfx);
 err_unreg_pardev:
	parport_unregister_device(pd);
}

static void tgfx_detach(struct parport *port)
{
	int i;
	struct tgfx *tgfx;

	for (i = 0; i < TGFX_MAX_PORTS; i++) {
		if (tgfx_base[i] && tgfx_base[i]->parportno == port->number)
			break;
	}

	if (i == TGFX_MAX_PORTS)
		return;

	tgfx = tgfx_base[i];
	tgfx_base[i] = NULL;

	for (i = 0; i < TGFX_MAX_DEVICES; i++)
		if (tgfx->dev[i])
			input_unregister_device(tgfx->dev[i]);
	parport_unregister_device(tgfx->pd);
	kfree(tgfx);
}

static struct parport_driver tgfx_parport_driver = {
	.name = "turbografx",
	.match_port = tgfx_attach,
	.detach = tgfx_detach,
	.devmodel = true,
};

static int __init tgfx_init(void)
{
	int i;
	int have_dev = 0;

	for (i = 0; i < TGFX_MAX_PORTS; i++) {
		if (tgfx_cfg[i].nargs == 0 || tgfx_cfg[i].args[0] < 0)
			continue;

		if (tgfx_cfg[i].nargs < 2) {
			printk(KERN_ERR "turbografx.c: at least one joystick must be specified\n");
			return -EINVAL;
		}

		have_dev = 1;
	}

	if (!have_dev)
		return -ENODEV;

	return parport_register_driver(&tgfx_parport_driver);
}

static void __exit tgfx_exit(void)
{
	parport_unregister_driver(&tgfx_parport_driver);
}

module_init(tgfx_init);
module_exit(tgfx_exit);
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
1da177e4 LT	3	* Copyright (c) 1998-2001 Vojtech Pavlik
	4	*
	5	* Based on the work of:
	6	* Steffen Schwenke
	7	*/
	8
	9	/*
	10	* TurboGraFX parallel port interface driver for Linux.
	11	*/
	12
1da177e4 LT	13	#include <linux/kernel.h>
	14	#include <linux/parport.h>
	15	#include <linux/input.h>
	16	#include <linux/module.h>
1da177e4	17	#include <linux/init.h>
72ba9f0c	18	#include <linux/mutex.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4 LT	20
	21	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	22	MODULE_DESCRIPTION("TurboGraFX parallel port interface driver");
	23	MODULE_LICENSE("GPL");
	24
17dd3f0f DT	25	#define TGFX_MAX_PORTS 3
17dd3f0f DT	26	#define TGFX_MAX_DEVICES 7
1da177e4	27
17dd3f0f DT	28	struct tgfx_config {
17dd3f0f DT	29	int args[TGFX_MAX_DEVICES + 1];
78167236	30	unsigned int nargs;
17dd3f0f DT	31	};
17dd3f0f DT	32
4de27a63	33	static struct tgfx_config tgfx_cfg[TGFX_MAX_PORTS];
1da177e4	34
78167236	35	module_param_array_named(map, tgfx_cfg[0].args, int, &tgfx_cfg[0].nargs, 0);
17dd3f0f	36	MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<js1>,<js2>,..<js7>");
78167236	37	module_param_array_named(map2, tgfx_cfg[1].args, int, &tgfx_cfg[1].nargs, 0);
17dd3f0f	38	MODULE_PARM_DESC(map2, "Describes second set of devices");
78167236	39	module_param_array_named(map3, tgfx_cfg[2].args, int, &tgfx_cfg[2].nargs, 0);
1da177e4 LT	40	MODULE_PARM_DESC(map3, "Describes third set of devices");
1da177e4 LT	41
1da177e4 LT	42	#define TGFX_REFRESH_TIME HZ/100 /* 10 ms */
	43
	44	#define TGFX_TRIGGER 0x08
	45	#define TGFX_UP 0x10
	46	#define TGFX_DOWN 0x20
	47	#define TGFX_LEFT 0x40
	48	#define TGFX_RIGHT 0x80
	49
	50	#define TGFX_THUMB 0x02
	51	#define TGFX_THUMB2 0x04
	52	#define TGFX_TOP 0x01
	53	#define TGFX_TOP2 0x08
	54
	55	static int tgfx_buttons[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2 };
1da177e4 LT	56
	57	static struct tgfx {
	58	struct pardevice *pd;
	59	struct timer_list timer;
17dd3f0f DT	60	struct input_dev *dev[TGFX_MAX_DEVICES];
	61	char name[TGFX_MAX_DEVICES][64];
	62	char phys[TGFX_MAX_DEVICES][32];
1da177e4 LT	63	int sticks;
1da177e4 LT	64	int used;
4de27a63	65	int parportno;
72ba9f0c	66	struct mutex sem;
17dd3f0f	67	} *tgfx_base[TGFX_MAX_PORTS];
1da177e4 LT	68
	69	/*
	70	* tgfx_timer() reads and analyzes TurboGraFX joystick data.
	71	*/
	72
e99e88a9	73	static void tgfx_timer(struct timer_list *t)
1da177e4	74	{
e99e88a9	75	struct tgfx *tgfx = from_timer(tgfx, t, timer);
1da177e4 LT	76	struct input_dev *dev;
	77	int data1, data2, i;
	78
	79	for (i = 0; i < 7; i++)
	80	if (tgfx->sticks & (1 << i)) {
	81
17dd3f0f	82	dev = tgfx->dev[i];
1da177e4 LT	83
	84	parport_write_data(tgfx->pd->port, ~(1 << i));
	85	data1 = parport_read_status(tgfx->pd->port) ^ 0x7f;
	86	data2 = parport_read_control(tgfx->pd->port) ^ 0x04; /* CAVEAT parport */
	87
	88	input_report_abs(dev, ABS_X, !!(data1 & TGFX_RIGHT) - !!(data1 & TGFX_LEFT));
	89	input_report_abs(dev, ABS_Y, !!(data1 & TGFX_DOWN ) - !!(data1 & TGFX_UP ));
	90
	91	input_report_key(dev, BTN_TRIGGER, (data1 & TGFX_TRIGGER));
	92	input_report_key(dev, BTN_THUMB, (data2 & TGFX_THUMB ));
	93	input_report_key(dev, BTN_THUMB2, (data2 & TGFX_THUMB2 ));
	94	input_report_key(dev, BTN_TOP, (data2 & TGFX_TOP ));
	95	input_report_key(dev, BTN_TOP2, (data2 & TGFX_TOP2 ));
	96
	97	input_sync(dev);
	98	}
	99
	100	mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
	101	}
	102
	103	static int tgfx_open(struct input_dev *dev)
	104	{
8715c1cf	105	struct tgfx *tgfx = input_get_drvdata(dev);
8b1a198b DT	106	int err;
8b1a198b DT	107
72ba9f0c	108	err = mutex_lock_interruptible(&tgfx->sem);
8b1a198b DT	109	if (err)
	110	return err;
	111
ab0c3443	112	if (!tgfx->used++) {
1da177e4 LT	113	parport_claim(tgfx->pd);
1da177e4 LT	114	parport_write_control(tgfx->pd->port, 0x04);
ab0c3443	115	mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
1da177e4	116	}
8b1a198b	117
72ba9f0c	118	mutex_unlock(&tgfx->sem);
ab0c3443	119	return 0;
1da177e4 LT	120	}
	121
	122	static void tgfx_close(struct input_dev *dev)
	123	{
8715c1cf	124	struct tgfx *tgfx = input_get_drvdata(dev);
8b1a198b	125
72ba9f0c	126	mutex_lock(&tgfx->sem);
ab0c3443	127	if (!--tgfx->used) {
8b1a198b	128	del_timer_sync(&tgfx->timer);
1da177e4	129	parport_write_control(tgfx->pd->port, 0x00);
ab0c3443	130	parport_release(tgfx->pd);
1da177e4	131	}
72ba9f0c	132	mutex_unlock(&tgfx->sem);
1da177e4 LT	133	}
1da177e4 LT	134
17dd3f0f DT	135
17dd3f0f DT	136
1da177e4 LT	137	/*
	138	* tgfx_probe() probes for tg gamepads.
	139	*/
	140
4de27a63	141	static void tgfx_attach(struct parport *pp)
1da177e4 LT	142	{
1da177e4 LT	143	struct tgfx *tgfx;
17dd3f0f	144	struct input_dev *input_dev;
17dd3f0f	145	struct pardevice *pd;
c65cf815	146	int i, j, port_idx;
4de27a63 SM	147	int *n_buttons, n_devs;
	148	struct pardev_cb tgfx_parport_cb;
	149
c65cf815 SM	150	for (port_idx = 0; port_idx < TGFX_MAX_PORTS; port_idx++) {
	151	if (tgfx_cfg[port_idx].nargs == 0 \|\|
	152	tgfx_cfg[port_idx].args[0] < 0)
4de27a63	153	continue;
c65cf815	154	if (tgfx_cfg[port_idx].args[0] == pp->number)
4de27a63 SM	155	break;
4de27a63 SM	156	}
1da177e4	157
c65cf815	158	if (port_idx == TGFX_MAX_PORTS) {
4de27a63 SM	159	pr_debug("Not using parport%d.\n", pp->number);
4de27a63 SM	160	return;
1da177e4	161	}
c65cf815 SM	162	n_buttons = tgfx_cfg[port_idx].args + 1;
c65cf815 SM	163	n_devs = tgfx_cfg[port_idx].nargs - 1;
1da177e4	164
3855e9e4	165	memset(&tgfx_parport_cb, 0, sizeof(tgfx_parport_cb));
4de27a63 SM	166	tgfx_parport_cb.flags = PARPORT_FLAG_EXCL;
4de27a63 SM	167
c65cf815 SM	168	pd = parport_register_dev_model(pp, "turbografx", &tgfx_parport_cb,
c65cf815 SM	169	port_idx);
17dd3f0f	170	if (!pd) {
4de27a63 SM	171	pr_err("parport busy already - lp.o loaded?\n");
4de27a63 SM	172	return;
1da177e4	173	}
8b1a198b	174
17dd3f0f DT	175	tgfx = kzalloc(sizeof(struct tgfx), GFP_KERNEL);
	176	if (!tgfx) {
	177	printk(KERN_ERR "turbografx.c: Not enough memory\n");
17dd3f0f	178	goto err_unreg_pardev;
1da177e4 LT	179	}
1da177e4 LT	180
72ba9f0c	181	mutex_init(&tgfx->sem);
17dd3f0f	182	tgfx->pd = pd;
4de27a63	183	tgfx->parportno = pp->number;
e99e88a9	184	timer_setup(&tgfx->timer, tgfx_timer, 0);
1da177e4	185
17dd3f0f DT	186	for (i = 0; i < n_devs; i++) {
	187	if (n_buttons[i] < 1)
	188	continue;
1da177e4	189
c20bc550	190	if (n_buttons[i] > ARRAY_SIZE(tgfx_buttons)) {
17dd3f0f	191	printk(KERN_ERR "turbografx.c: Invalid number of buttons %d\n", n_buttons[i]);
ab52cd66	192	goto err_unreg_devs;
17dd3f0f	193	}
1da177e4	194
17dd3f0f DT	195	tgfx->dev[i] = input_dev = input_allocate_device();
	196	if (!input_dev) {
	197	printk(KERN_ERR "turbografx.c: Not enough memory for input device\n");
ab52cd66	198	goto err_unreg_devs;
17dd3f0f	199	}
1da177e4	200
17dd3f0f DT	201	tgfx->sticks \|= (1 << i);
	202	snprintf(tgfx->name[i], sizeof(tgfx->name[i]),
	203	"TurboGraFX %d-button Multisystem joystick", n_buttons[i]);
	204	snprintf(tgfx->phys[i], sizeof(tgfx->phys[i]),
	205	"%s/input%d", tgfx->pd->port->name, i);
1da177e4	206
17dd3f0f DT	207	input_dev->name = tgfx->name[i];
	208	input_dev->phys = tgfx->phys[i];
	209	input_dev->id.bustype = BUS_PARPORT;
	210	input_dev->id.vendor = 0x0003;
	211	input_dev->id.product = n_buttons[i];
	212	input_dev->id.version = 0x0100;
1da177e4	213
8715c1cf DT	214	input_set_drvdata(input_dev, tgfx);
8715c1cf DT	215
17dd3f0f DT	216	input_dev->open = tgfx_open;
17dd3f0f DT	217	input_dev->close = tgfx_close;
1da177e4	218
7b19ada2	219	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
17dd3f0f DT	220	input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
17dd3f0f DT	221	input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
1da177e4	222
17dd3f0f DT	223	for (j = 0; j < n_buttons[i]; j++)
17dd3f0f DT	224	set_bit(tgfx_buttons[j], input_dev->keybit);
1da177e4	225
4de27a63	226	if (input_register_device(tgfx->dev[i]))
ab52cd66	227	goto err_free_dev;
17dd3f0f	228	}
1da177e4 LT	229
1da177e4 LT	230	if (!tgfx->sticks) {
17dd3f0f	231	printk(KERN_ERR "turbografx.c: No valid devices specified\n");
17dd3f0f	232	goto err_free_tgfx;
1da177e4 LT	233	}
1da177e4 LT	234
c65cf815	235	tgfx_base[port_idx] = tgfx;
4de27a63	236	return;
17dd3f0f	237
ab52cd66 DT	238	err_free_dev:
	239	input_free_device(tgfx->dev[i]);
	240	err_unreg_devs:
17dd3f0f	241	while (--i >= 0)
ab52cd66 DT	242	if (tgfx->dev[i])
ab52cd66 DT	243	input_unregister_device(tgfx->dev[i]);
17dd3f0f DT	244	err_free_tgfx:
	245	kfree(tgfx);
	246	err_unreg_pardev:
	247	parport_unregister_device(pd);
17dd3f0f DT	248	}
17dd3f0f DT	249
4de27a63	250	static void tgfx_detach(struct parport *port)
17dd3f0f DT	251	{
17dd3f0f DT	252	int i;
4de27a63 SM	253	struct tgfx *tgfx;
	254
	255	for (i = 0; i < TGFX_MAX_PORTS; i++) {
	256	if (tgfx_base[i] && tgfx_base[i]->parportno == port->number)
	257	break;
	258	}
	259
	260	if (i == TGFX_MAX_PORTS)
	261	return;
	262
	263	tgfx = tgfx_base[i];
	264	tgfx_base[i] = NULL;
17dd3f0f DT	265
	266	for (i = 0; i < TGFX_MAX_DEVICES; i++)
	267	if (tgfx->dev[i])
	268	input_unregister_device(tgfx->dev[i]);
	269	parport_unregister_device(tgfx->pd);
	270	kfree(tgfx);
1da177e4 LT	271	}
1da177e4 LT	272
4de27a63 SM	273	static struct parport_driver tgfx_parport_driver = {
	274	.name = "turbografx",
	275	.match_port = tgfx_attach,
	276	.detach = tgfx_detach,
	277	.devmodel = true,
	278	};
	279
1da177e4 LT	280	static int __init tgfx_init(void)
1da177e4 LT	281	{
17dd3f0f DT	282	int i;
17dd3f0f DT	283	int have_dev = 0;
17dd3f0f DT	284
17dd3f0f DT	285	for (i = 0; i < TGFX_MAX_PORTS; i++) {
78167236	286	if (tgfx_cfg[i].nargs == 0 \|\| tgfx_cfg[i].args[0] < 0)
17dd3f0f DT	287	continue;
17dd3f0f DT	288
78167236	289	if (tgfx_cfg[i].nargs < 2) {
17dd3f0f	290	printk(KERN_ERR "turbografx.c: at least one joystick must be specified\n");
4de27a63	291	return -EINVAL;
17dd3f0f DT	292	}
	293
	294	have_dev = 1;
	295	}
1da177e4	296
4de27a63 SM	297	if (!have_dev)
4de27a63 SM	298	return -ENODEV;
1da177e4	299
4de27a63	300	return parport_register_driver(&tgfx_parport_driver);
1da177e4 LT	301	}
	302
	303	static void __exit tgfx_exit(void)
	304	{
4de27a63	305	parport_unregister_driver(&tgfx_parport_driver);
1da177e4 LT	306	}
	307
	308	module_init(tgfx_init);
	309	module_exit(tgfx_exit);