1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
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
13#include <linux/kernel.h>
14#include <linux/parport.h>
15#include <linux/input.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/mutex.h>
19#include <linux/slab.h>
20
21MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
22MODULE_DESCRIPTION("TurboGraFX parallel port interface driver");
23MODULE_LICENSE("GPL");
24
25#define TGFX_MAX_PORTS 3
26#define TGFX_MAX_DEVICES 7
27
28struct tgfx_config {
29 int args[TGFX_MAX_DEVICES + 1];
30 unsigned int nargs;
31};
32
33static struct tgfx_config tgfx_cfg[TGFX_MAX_PORTS];
34
35module_param_array_named(map, tgfx_cfg[0].args, int, &tgfx_cfg[0].nargs, 0);
36MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<js1>,<js2>,..<js7>");
37module_param_array_named(map2, tgfx_cfg[1].args, int, &tgfx_cfg[1].nargs, 0);
38MODULE_PARM_DESC(map2, "Describes second set of devices");
39module_param_array_named(map3, tgfx_cfg[2].args, int, &tgfx_cfg[2].nargs, 0);
40MODULE_PARM_DESC(map3, "Describes third set of devices");
41
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
55static int tgfx_buttons[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2 };
56
57static struct tgfx {
58 struct pardevice *pd;
59 struct timer_list timer;
60 struct input_dev *dev[TGFX_MAX_DEVICES];
61 char name[TGFX_MAX_DEVICES][64];
62 char phys[TGFX_MAX_DEVICES][32];
63 int sticks;
64 int used;
65 int parportno;
66 struct mutex sem;
67} *tgfx_base[TGFX_MAX_PORTS];
68
69/*
70 * tgfx_timer() reads and analyzes TurboGraFX joystick data.
71 */
72
73static void tgfx_timer(struct timer_list *t)
74{
75 struct tgfx *tgfx = from_timer(tgfx, t, timer);
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
82 dev = tgfx->dev[i];
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, value: !!(data1 & TGFX_RIGHT) - !!(data1 & TGFX_LEFT));
89 input_report_abs(dev, ABS_Y, value: !!(data1 & TGFX_DOWN ) - !!(data1 & TGFX_UP ));
90
91 input_report_key(dev, BTN_TRIGGER, value: (data1 & TGFX_TRIGGER));
92 input_report_key(dev, BTN_THUMB, value: (data2 & TGFX_THUMB ));
93 input_report_key(dev, BTN_THUMB2, value: (data2 & TGFX_THUMB2 ));
94 input_report_key(dev, BTN_TOP, value: (data2 & TGFX_TOP ));
95 input_report_key(dev, BTN_TOP2, value: (data2 & TGFX_TOP2 ));
96
97 input_sync(dev);
98 }
99
100 mod_timer(timer: &tgfx->timer, expires: jiffies + TGFX_REFRESH_TIME);
101}
102
103static int tgfx_open(struct input_dev *dev)
104{
105 struct tgfx *tgfx = input_get_drvdata(dev);
106 int err;
107
108 err = mutex_lock_interruptible(&tgfx->sem);
109 if (err)
110 return err;
111
112 if (!tgfx->used++) {
113 parport_claim(dev: tgfx->pd);
114 parport_write_control(tgfx->pd->port, 0x04);
115 mod_timer(timer: &tgfx->timer, expires: jiffies + TGFX_REFRESH_TIME);
116 }
117
118 mutex_unlock(lock: &tgfx->sem);
119 return 0;
120}
121
122static void tgfx_close(struct input_dev *dev)
123{
124 struct tgfx *tgfx = input_get_drvdata(dev);
125
126 mutex_lock(&tgfx->sem);
127 if (!--tgfx->used) {
128 del_timer_sync(timer: &tgfx->timer);
129 parport_write_control(tgfx->pd->port, 0x00);
130 parport_release(dev: tgfx->pd);
131 }
132 mutex_unlock(lock: &tgfx->sem);
133}
134
135
136
137/*
138 * tgfx_probe() probes for tg gamepads.
139 */
140
141static void tgfx_attach(struct parport *pp)
142{
143 struct tgfx *tgfx;
144 struct input_dev *input_dev;
145 struct pardevice *pd;
146 int i, j, port_idx;
147 int *n_buttons, n_devs;
148 struct pardev_cb tgfx_parport_cb;
149
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)
153 continue;
154 if (tgfx_cfg[port_idx].args[0] == pp->number)
155 break;
156 }
157
158 if (port_idx == TGFX_MAX_PORTS) {
159 pr_debug("Not using parport%d.\n", pp->number);
160 return;
161 }
162 n_buttons = tgfx_cfg[port_idx].args + 1;
163 n_devs = tgfx_cfg[port_idx].nargs - 1;
164
165 memset(&tgfx_parport_cb, 0, sizeof(tgfx_parport_cb));
166 tgfx_parport_cb.flags = PARPORT_FLAG_EXCL;
167
168 pd = parport_register_dev_model(port: pp, name: "turbografx", par_dev_cb: &tgfx_parport_cb,
169 cnt: port_idx);
170 if (!pd) {
171 pr_err("parport busy already - lp.o loaded?\n");
172 return;
173 }
174
175 tgfx = kzalloc(size: sizeof(struct tgfx), GFP_KERNEL);
176 if (!tgfx) {
177 printk(KERN_ERR "turbografx.c: Not enough memory\n");
178 goto err_unreg_pardev;
179 }
180
181 mutex_init(&tgfx->sem);
182 tgfx->pd = pd;
183 tgfx->parportno = pp->number;
184 timer_setup(&tgfx->timer, tgfx_timer, 0);
185
186 for (i = 0; i < n_devs; i++) {
187 if (n_buttons[i] < 1)
188 continue;
189
190 if (n_buttons[i] > ARRAY_SIZE(tgfx_buttons)) {
191 printk(KERN_ERR "turbografx.c: Invalid number of buttons %d\n", n_buttons[i]);
192 goto err_unreg_devs;
193 }
194
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");
198 goto err_unreg_devs;
199 }
200
201 tgfx->sticks |= (1 << i);
202 snprintf(buf: tgfx->name[i], size: sizeof(tgfx->name[i]),
203 fmt: "TurboGraFX %d-button Multisystem joystick", n_buttons[i]);
204 snprintf(buf: tgfx->phys[i], size: sizeof(tgfx->phys[i]),
205 fmt: "%s/input%d", tgfx->pd->port->name, i);
206
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;
213
214 input_set_drvdata(dev: input_dev, data: tgfx);
215
216 input_dev->open = tgfx_open;
217 input_dev->close = tgfx_close;
218
219 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
220 input_set_abs_params(dev: input_dev, ABS_X, min: -1, max: 1, fuzz: 0, flat: 0);
221 input_set_abs_params(dev: input_dev, ABS_Y, min: -1, max: 1, fuzz: 0, flat: 0);
222
223 for (j = 0; j < n_buttons[i]; j++)
224 set_bit(nr: tgfx_buttons[j], addr: input_dev->keybit);
225
226 if (input_register_device(tgfx->dev[i]))
227 goto err_free_dev;
228 }
229
230 if (!tgfx->sticks) {
231 printk(KERN_ERR "turbografx.c: No valid devices specified\n");
232 goto err_free_tgfx;
233 }
234
235 tgfx_base[port_idx] = tgfx;
236 return;
237
238 err_free_dev:
239 input_free_device(dev: tgfx->dev[i]);
240 err_unreg_devs:
241 while (--i >= 0)
242 if (tgfx->dev[i])
243 input_unregister_device(tgfx->dev[i]);
244 err_free_tgfx:
245 kfree(objp: tgfx);
246 err_unreg_pardev:
247 parport_unregister_device(dev: pd);
248}
249
250static void tgfx_detach(struct parport *port)
251{
252 int i;
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;
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(dev: tgfx->pd);
270 kfree(objp: tgfx);
271}
272
273static struct parport_driver tgfx_parport_driver = {
274 .name = "turbografx",
275 .match_port = tgfx_attach,
276 .detach = tgfx_detach,
277 .devmodel = true,
278};
279
280static int __init tgfx_init(void)
281{
282 int i;
283 int have_dev = 0;
284
285 for (i = 0; i < TGFX_MAX_PORTS; i++) {
286 if (tgfx_cfg[i].nargs == 0 || tgfx_cfg[i].args[0] < 0)
287 continue;
288
289 if (tgfx_cfg[i].nargs < 2) {
290 printk(KERN_ERR "turbografx.c: at least one joystick must be specified\n");
291 return -EINVAL;
292 }
293
294 have_dev = 1;
295 }
296
297 if (!have_dev)
298 return -ENODEV;
299
300 return parport_register_driver(&tgfx_parport_driver);
301}
302
303static void __exit tgfx_exit(void)
304{
305 parport_unregister_driver(&tgfx_parport_driver);
306}
307
308module_init(tgfx_init);
309module_exit(tgfx_exit);
310

source code of linux/drivers/input/joystick/turbografx.c