1/*
2 *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
3 *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
4 *
5 *  USB/RS232 I-Force joysticks and wheels.
6 */
7
8/*
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 * Should you need to contact me, the author, you can do so either by
24 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
25 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
26 */
27
28#include "iforce.h"
29
30static struct {
31	__s32 x;
32	__s32 y;
33} iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
34
35
36void iforce_dump_packet(char *msg, u16 cmd, unsigned char *data)
37{
38	int i;
39
40	printk(KERN_DEBUG __FILE__ ": %s cmd = %04x, data = ", msg, cmd);
41	for (i = 0; i < LO(cmd); i++)
42		printk("%02x ", data[i]);
43	printk("\n");
44}
45
46/*
47 * Send a packet of bytes to the device
48 */
49int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
50{
51	/* Copy data to buffer */
52	int n = LO(cmd);
53	int c;
54	int empty;
55	int head, tail;
56	unsigned long flags;
57
58/*
59 * Update head and tail of xmit buffer
60 */
61	spin_lock_irqsave(&iforce->xmit_lock, flags);
62
63	head = iforce->xmit.head;
64	tail = iforce->xmit.tail;
65
66
67	if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
68		dev_warn(&iforce->dev->dev,
69			 "not enough space in xmit buffer to send new packet\n");
70		spin_unlock_irqrestore(&iforce->xmit_lock, flags);
71		return -1;
72	}
73
74	empty = head == tail;
75	XMIT_INC(iforce->xmit.head, n+2);
76
77/*
78 * Store packet in xmit buffer
79 */
80	iforce->xmit.buf[head] = HI(cmd);
81	XMIT_INC(head, 1);
82	iforce->xmit.buf[head] = LO(cmd);
83	XMIT_INC(head, 1);
84
85	c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
86	if (n < c) c=n;
87
88	memcpy(&iforce->xmit.buf[head],
89	       data,
90	       c);
91	if (n != c) {
92		memcpy(&iforce->xmit.buf[0],
93		       data + c,
94		       n - c);
95	}
96	XMIT_INC(head, n);
97
98	spin_unlock_irqrestore(&iforce->xmit_lock, flags);
99/*
100 * If necessary, start the transmission
101 */
102	switch (iforce->bus) {
103
104#ifdef CONFIG_JOYSTICK_IFORCE_232
105		case IFORCE_232:
106		if (empty)
107			iforce_serial_xmit(iforce);
108		break;
109#endif
110#ifdef CONFIG_JOYSTICK_IFORCE_USB
111		case IFORCE_USB:
112
113		if (iforce->usbdev && empty &&
114			!test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
115
116			iforce_usb_xmit(iforce);
117		}
118		break;
119#endif
120	}
121	return 0;
122}
123
124/* Start or stop an effect */
125int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
126{
127	unsigned char data[3];
128
129	data[0] = LO(id);
130	data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
131	data[2] = LO(value);
132	return iforce_send_packet(iforce, FF_CMD_PLAY, data);
133}
134
135/* Mark an effect that was being updated as ready. That means it can be updated
136 * again */
137static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
138{
139	int i;
140
141	if (!iforce->dev->ff)
142		return 0;
143
144	for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
145		if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
146		    (iforce->core_effects[i].mod1_chunk.start == addr ||
147		     iforce->core_effects[i].mod2_chunk.start == addr)) {
148			clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
149			return 0;
150		}
151	}
152	dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
153	return -1;
154}
155
156void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
157{
158	struct input_dev *dev = iforce->dev;
159	int i;
160	static int being_used = 0;
161
162	if (being_used)
163		dev_warn(&iforce->dev->dev,
164			 "re-entrant call to iforce_process %d\n", being_used);
165	being_used++;
166
167#ifdef CONFIG_JOYSTICK_IFORCE_232
168	if (HI(iforce->expect_packet) == HI(cmd)) {
169		iforce->expect_packet = 0;
170		iforce->ecmd = cmd;
171		memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
172	}
173#endif
174	wake_up(&iforce->wait);
175
176	if (!iforce->type) {
177		being_used--;
178		return;
179	}
180
181	switch (HI(cmd)) {
182
183		case 0x01:	/* joystick position data */
184		case 0x03:	/* wheel position data */
185			if (HI(cmd) == 1) {
186				input_report_abs(dev, ABS_X, (__s16) (((__s16)data[1] << 8) | data[0]));
187				input_report_abs(dev, ABS_Y, (__s16) (((__s16)data[3] << 8) | data[2]));
188				input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
189				if (LO(cmd) >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
190					input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
191			} else {
192				input_report_abs(dev, ABS_WHEEL, (__s16) (((__s16)data[1] << 8) | data[0]));
193				input_report_abs(dev, ABS_GAS,   255 - data[2]);
194				input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
195			}
196
197			input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
198			input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
199
200			for (i = 0; iforce->type->btn[i] >= 0; i++)
201				input_report_key(dev, iforce->type->btn[i], data[(i >> 3) + 5] & (1 << (i & 7)));
202
203			/* If there are untouched bits left, interpret them as the second hat */
204			if (i <= 8) {
205				int btns = data[6];
206				if (test_bit(ABS_HAT1X, dev->absbit)) {
207					if (btns & 8) input_report_abs(dev, ABS_HAT1X, -1);
208					else if (btns & 2) input_report_abs(dev, ABS_HAT1X, 1);
209					else input_report_abs(dev, ABS_HAT1X, 0);
210				}
211				if (test_bit(ABS_HAT1Y, dev->absbit)) {
212					if (btns & 1) input_report_abs(dev, ABS_HAT1Y, -1);
213					else if (btns & 4) input_report_abs(dev, ABS_HAT1Y, 1);
214					else input_report_abs(dev, ABS_HAT1Y, 0);
215				}
216			}
217
218			input_sync(dev);
219
220			break;
221
222		case 0x02:	/* status report */
223			input_report_key(dev, BTN_DEAD, data[0] & 0x02);
224			input_sync(dev);
225
226			/* Check if an effect was just started or stopped */
227			i = data[1] & 0x7f;
228			if (data[1] & 0x80) {
229				if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
230					/* Report play event */
231					input_report_ff_status(dev, i, FF_STATUS_PLAYING);
232				}
233			} else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
234				/* Report stop event */
235				input_report_ff_status(dev, i, FF_STATUS_STOPPED);
236			}
237			if (LO(cmd) > 3) {
238				int j;
239				for (j = 3; j < LO(cmd); j += 2)
240					mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
241			}
242			break;
243	}
244	being_used--;
245}
246
247int iforce_get_id_packet(struct iforce *iforce, char *packet)
248{
249	switch (iforce->bus) {
250
251	case IFORCE_USB: {
252#ifdef CONFIG_JOYSTICK_IFORCE_USB
253		int status;
254
255		iforce->cr.bRequest = packet[0];
256		iforce->ctrl->dev = iforce->usbdev;
257
258		status = usb_submit_urb(iforce->ctrl, GFP_ATOMIC);
259		if (status) {
260			dev_err(&iforce->intf->dev,
261				"usb_submit_urb failed %d\n", status);
262			return -1;
263		}
264
265		wait_event_interruptible_timeout(iforce->wait,
266			iforce->ctrl->status != -EINPROGRESS, HZ);
267
268		if (iforce->ctrl->status) {
269			dev_dbg(&iforce->intf->dev,
270				"iforce->ctrl->status = %d\n",
271				iforce->ctrl->status);
272			usb_unlink_urb(iforce->ctrl);
273			return -1;
274		}
275#else
276		printk(KERN_DEBUG "iforce_get_id_packet: iforce->bus = USB!\n");
277#endif
278		}
279		break;
280
281	case IFORCE_232:
282
283#ifdef CONFIG_JOYSTICK_IFORCE_232
284		iforce->expect_packet = FF_CMD_QUERY;
285		iforce_send_packet(iforce, FF_CMD_QUERY, packet);
286
287		wait_event_interruptible_timeout(iforce->wait,
288			!iforce->expect_packet, HZ);
289
290		if (iforce->expect_packet) {
291			iforce->expect_packet = 0;
292			return -1;
293		}
294#else
295		dev_err(&iforce->dev->dev,
296			"iforce_get_id_packet: iforce->bus = SERIO!\n");
297#endif
298		break;
299
300	default:
301		dev_err(&iforce->dev->dev,
302			"iforce_get_id_packet: iforce->bus = %d\n",
303			iforce->bus);
304		break;
305	}
306
307	return -(iforce->edata[0] != packet[0]);
308}
309
310