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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/errno.h>
11#include <linux/init.h>
12#include <linux/input.h>
13#include <linux/limits.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/mutex.h>
17#include <linux/platform_device.h>
18#include <linux/slab.h>
19#include <linux/timer.h>
20
21MODULE_AUTHOR("Lauri Kasanen <cand@gmx.com>");
22MODULE_DESCRIPTION("Driver for N64 controllers");
23MODULE_LICENSE("GPL");
24
25#define PIF_RAM 0x1fc007c0
26
27#define SI_DRAM_REG 0
28#define SI_READ_REG 1
29#define SI_WRITE_REG 4
30#define SI_STATUS_REG 6
31
32#define SI_STATUS_DMA_BUSY BIT(0)
33#define SI_STATUS_IO_BUSY BIT(1)
34
35#define N64_CONTROLLER_ID 0x0500
36
37#define MAX_CONTROLLERS 4
38
39static const char *n64joy_phys[MAX_CONTROLLERS] = {
40 "n64joy/port0",
41 "n64joy/port1",
42 "n64joy/port2",
43 "n64joy/port3",
44};
45
46struct n64joy_priv {
47 u64 si_buf[8] ____cacheline_aligned;
48 struct timer_list timer;
49 struct mutex n64joy_mutex;
50 struct input_dev *n64joy_dev[MAX_CONTROLLERS];
51 u32 __iomem *reg_base;
52 u8 n64joy_opened;
53};
54
55struct joydata {
56 unsigned int: 16;
57 unsigned int err: 2;
58 unsigned int: 14;
59
60 union {
61 u32 data;
62
63 struct {
64 unsigned int a: 1;
65 unsigned int b: 1;
66 unsigned int z: 1;
67 unsigned int start: 1;
68 unsigned int up: 1;
69 unsigned int down: 1;
70 unsigned int left: 1;
71 unsigned int right: 1;
72 unsigned int: 2;
73 unsigned int l: 1;
74 unsigned int r: 1;
75 unsigned int c_up: 1;
76 unsigned int c_down: 1;
77 unsigned int c_left: 1;
78 unsigned int c_right: 1;
79 signed int x: 8;
80 signed int y: 8;
81 };
82 };
83};
84
85static void n64joy_write_reg(u32 __iomem *reg_base, const u8 reg, const u32 value)
86{
87 writel(value, reg_base + reg);
88}
89
90static u32 n64joy_read_reg(u32 __iomem *reg_base, const u8 reg)
91{
92 return readl(reg_base + reg);
93}
94
95static void n64joy_wait_si_dma(u32 __iomem *reg_base)
96{
97 while (n64joy_read_reg(reg_base, SI_STATUS_REG) &
98 (SI_STATUS_DMA_BUSY | SI_STATUS_IO_BUSY))
99 cpu_relax();
100}
101
102static void n64joy_exec_pif(struct n64joy_priv *priv, const u64 in[8])
103{
104 unsigned long flags;
105
106 dma_cache_wback_inv((unsigned long) in, 8 * 8);
107 dma_cache_inv((unsigned long) priv->si_buf, 8 * 8);
108
109 local_irq_save(flags);
110
111 n64joy_wait_si_dma(priv->reg_base);
112
113 barrier();
114 n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(in));
115 barrier();
116 n64joy_write_reg(priv->reg_base, SI_WRITE_REG, PIF_RAM);
117 barrier();
118
119 n64joy_wait_si_dma(priv->reg_base);
120
121 barrier();
122 n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(priv->si_buf));
123 barrier();
124 n64joy_write_reg(priv->reg_base, SI_READ_REG, PIF_RAM);
125 barrier();
126
127 n64joy_wait_si_dma(priv->reg_base);
128
129 local_irq_restore(flags);
130}
131
132static const u64 polldata[] ____cacheline_aligned = {
133 0xff010401ffffffff,
134 0xff010401ffffffff,
135 0xff010401ffffffff,
136 0xff010401ffffffff,
137 0xfe00000000000000,
138 0,
139 0,
140 1
141};
142
143static void n64joy_poll(struct timer_list *t)
144{
145 const struct joydata *data;
146 struct n64joy_priv *priv = container_of(t, struct n64joy_priv, timer);
147 struct input_dev *dev;
148 u32 i;
149
150 n64joy_exec_pif(priv, polldata);
151
152 data = (struct joydata *) priv->si_buf;
153
154 for (i = 0; i < MAX_CONTROLLERS; i++) {
155 if (!priv->n64joy_dev[i])
156 continue;
157
158 dev = priv->n64joy_dev[i];
159
160
161 input_report_key(dev, BTN_DPAD_UP, data[i].up);
162 input_report_key(dev, BTN_DPAD_DOWN, data[i].down);
163 input_report_key(dev, BTN_DPAD_LEFT, data[i].left);
164 input_report_key(dev, BTN_DPAD_RIGHT, data[i].right);
165
166
167 input_report_key(dev, BTN_FORWARD, data[i].c_up);
168 input_report_key(dev, BTN_BACK, data[i].c_down);
169 input_report_key(dev, BTN_LEFT, data[i].c_left);
170 input_report_key(dev, BTN_RIGHT, data[i].c_right);
171
172
173 input_report_key(dev, BTN_START, data[i].start);
174 input_report_key(dev, BTN_Z, data[i].z);
175
176
177 input_report_key(dev, BTN_0, data[i].a);
178 input_report_key(dev, BTN_1, data[i].b);
179 input_report_key(dev, BTN_2, data[i].l);
180 input_report_key(dev, BTN_3, data[i].r);
181
182 input_report_abs(dev, ABS_X, data[i].x);
183 input_report_abs(dev, ABS_Y, data[i].y);
184
185 input_sync(dev);
186 }
187
188 mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
189}
190
191static int n64joy_open(struct input_dev *dev)
192{
193 struct n64joy_priv *priv = input_get_drvdata(dev);
194 int err;
195
196 err = mutex_lock_interruptible(&priv->n64joy_mutex);
197 if (err)
198 return err;
199
200 if (!priv->n64joy_opened) {
201
202
203
204
205 timer_setup(&priv->timer, n64joy_poll, 0);
206 mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
207 }
208
209 priv->n64joy_opened++;
210
211 mutex_unlock(&priv->n64joy_mutex);
212 return err;
213}
214
215static void n64joy_close(struct input_dev *dev)
216{
217 struct n64joy_priv *priv = input_get_drvdata(dev);
218
219 mutex_lock(&priv->n64joy_mutex);
220 if (!--priv->n64joy_opened)
221 del_timer_sync(&priv->timer);
222 mutex_unlock(&priv->n64joy_mutex);
223}
224
225static const u64 __initconst scandata[] ____cacheline_aligned = {
226 0xff010300ffffffff,
227 0xff010300ffffffff,
228 0xff010300ffffffff,
229 0xff010300ffffffff,
230 0xfe00000000000000,
231 0,
232 0,
233 1
234};
235
236
237
238
239
240
241static int __init n64joy_probe(struct platform_device *pdev)
242{
243 const struct joydata *data;
244 struct n64joy_priv *priv;
245 struct input_dev *dev;
246 int err = 0;
247 u32 i, j, found = 0;
248
249 priv = kzalloc(sizeof(struct n64joy_priv), GFP_KERNEL);
250 if (!priv)
251 return -ENOMEM;
252 mutex_init(&priv->n64joy_mutex);
253
254 priv->reg_base = devm_platform_ioremap_resource(pdev, 0);
255 if (IS_ERR(priv->reg_base)) {
256 err = PTR_ERR(priv->reg_base);
257 goto fail;
258 }
259
260
261 n64joy_exec_pif(priv, scandata);
262
263 data = (struct joydata *) priv->si_buf;
264
265 for (i = 0; i < MAX_CONTROLLERS; i++) {
266 if (!data[i].err && data[i].data >> 16 == N64_CONTROLLER_ID) {
267 found++;
268
269 dev = priv->n64joy_dev[i] = input_allocate_device();
270 if (!priv->n64joy_dev[i]) {
271 err = -ENOMEM;
272 goto fail;
273 }
274
275 input_set_drvdata(dev, priv);
276
277 dev->name = "N64 controller";
278 dev->phys = n64joy_phys[i];
279 dev->id.bustype = BUS_HOST;
280 dev->id.vendor = 0;
281 dev->id.product = data[i].data >> 16;
282 dev->id.version = 0;
283 dev->dev.parent = &pdev->dev;
284
285 dev->open = n64joy_open;
286 dev->close = n64joy_close;
287
288
289 input_set_capability(dev, EV_KEY, BTN_DPAD_UP);
290 input_set_capability(dev, EV_KEY, BTN_DPAD_DOWN);
291 input_set_capability(dev, EV_KEY, BTN_DPAD_LEFT);
292 input_set_capability(dev, EV_KEY, BTN_DPAD_RIGHT);
293
294 input_set_capability(dev, EV_KEY, BTN_LEFT);
295 input_set_capability(dev, EV_KEY, BTN_RIGHT);
296 input_set_capability(dev, EV_KEY, BTN_FORWARD);
297 input_set_capability(dev, EV_KEY, BTN_BACK);
298
299 input_set_capability(dev, EV_KEY, BTN_START);
300 input_set_capability(dev, EV_KEY, BTN_Z);
301
302 input_set_capability(dev, EV_KEY, BTN_0);
303 input_set_capability(dev, EV_KEY, BTN_1);
304 input_set_capability(dev, EV_KEY, BTN_2);
305 input_set_capability(dev, EV_KEY, BTN_3);
306
307 for (j = 0; j < 2; j++)
308 input_set_abs_params(dev, ABS_X + j,
309 S8_MIN, S8_MAX, 0, 0);
310
311 err = input_register_device(dev);
312 if (err) {
313 input_free_device(dev);
314 goto fail;
315 }
316 }
317 }
318
319 pr_info("%u controller(s) connected\n", found);
320
321 if (!found)
322 return -ENODEV;
323
324 return 0;
325fail:
326 for (i = 0; i < MAX_CONTROLLERS; i++) {
327 if (!priv->n64joy_dev[i])
328 continue;
329 input_unregister_device(priv->n64joy_dev[i]);
330 }
331 return err;
332}
333
334static struct platform_driver n64joy_driver = {
335 .driver = {
336 .name = "n64joy",
337 },
338};
339
340static int __init n64joy_init(void)
341{
342 return platform_driver_probe(&n64joy_driver, n64joy_probe);
343}
344
345module_init(n64joy_init);
346
