1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
4 * Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
5 *
6 * USB/RS232 I-Force joysticks and wheels.
7 */
8
9 #include <linux/unaligned.h>
10 #include "iforce.h"
11
12 static struct {
13 __s32 x;
14 __s32 y;
15 } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
16
17
iforce_dump_packet(struct iforce * iforce,char * msg,u16 cmd,unsigned char * data)18 void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data)
19 {
20 dev_dbg(iforce->dev->dev.parent, "%s %s cmd = %04x, data = %*ph\n",
21 __func__, msg, cmd, LO(cmd), data);
22 }
23
24 /*
25 * Send a packet of bytes to the device
26 */
iforce_send_packet(struct iforce * iforce,u16 cmd,unsigned char * data)27 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
28 {
29 /* Copy data to buffer */
30 int n = LO(cmd);
31 int c;
32 int empty;
33 int head, tail;
34 unsigned long flags;
35
36 /*
37 * Update head and tail of xmit buffer
38 */
39 spin_lock_irqsave(&iforce->xmit_lock, flags);
40
41 head = iforce->xmit.head;
42 tail = iforce->xmit.tail;
43
44
45 if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
46 dev_warn(&iforce->dev->dev,
47 "not enough space in xmit buffer to send new packet\n");
48 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
49 return -1;
50 }
51
52 empty = head == tail;
53 XMIT_INC(iforce->xmit.head, n+2);
54
55 /*
56 * Store packet in xmit buffer
57 */
58 iforce->xmit.buf[head] = HI(cmd);
59 XMIT_INC(head, 1);
60 iforce->xmit.buf[head] = LO(cmd);
61 XMIT_INC(head, 1);
62
63 c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
64 if (n < c) c=n;
65
66 memcpy(&iforce->xmit.buf[head],
67 data,
68 c);
69 if (n != c) {
70 memcpy(&iforce->xmit.buf[0],
71 data + c,
72 n - c);
73 }
74 XMIT_INC(head, n);
75
76 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
77 /*
78 * If necessary, start the transmission
79 */
80 if (empty)
81 iforce->xport_ops->xmit(iforce);
82
83 return 0;
84 }
85 EXPORT_SYMBOL(iforce_send_packet);
86
87 /* Start or stop an effect */
iforce_control_playback(struct iforce * iforce,u16 id,unsigned int value)88 int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
89 {
90 unsigned char data[3];
91
92 data[0] = LO(id);
93 data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
94 data[2] = LO(value);
95 return iforce_send_packet(iforce, FF_CMD_PLAY, data);
96 }
97
98 /* Mark an effect that was being updated as ready. That means it can be updated
99 * again */
mark_core_as_ready(struct iforce * iforce,unsigned short addr)100 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
101 {
102 int i;
103
104 if (!iforce->dev->ff)
105 return 0;
106
107 for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
108 if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
109 (iforce->core_effects[i].mod1_chunk.start == addr ||
110 iforce->core_effects[i].mod2_chunk.start == addr)) {
111 clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
112 return 0;
113 }
114 }
115 dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
116 return -1;
117 }
118
iforce_report_hats_buttons(struct iforce * iforce,u8 * data)119 static void iforce_report_hats_buttons(struct iforce *iforce, u8 *data)
120 {
121 struct input_dev *dev = iforce->dev;
122 int i;
123
124 input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
125 input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
126
127 for (i = 0; iforce->type->btn[i] >= 0; i++)
128 input_report_key(dev, iforce->type->btn[i],
129 data[(i >> 3) + 5] & (1 << (i & 7)));
130
131 /* If there are untouched bits left, interpret them as the second hat */
132 if (i <= 8) {
133 u8 btns = data[6];
134
135 if (test_bit(ABS_HAT1X, dev->absbit)) {
136 if (btns & BIT(3))
137 input_report_abs(dev, ABS_HAT1X, -1);
138 else if (btns & BIT(1))
139 input_report_abs(dev, ABS_HAT1X, 1);
140 else
141 input_report_abs(dev, ABS_HAT1X, 0);
142 }
143
144 if (test_bit(ABS_HAT1Y, dev->absbit)) {
145 if (btns & BIT(0))
146 input_report_abs(dev, ABS_HAT1Y, -1);
147 else if (btns & BIT(2))
148 input_report_abs(dev, ABS_HAT1Y, 1);
149 else
150 input_report_abs(dev, ABS_HAT1Y, 0);
151 }
152 }
153 }
154
iforce_process_packet(struct iforce * iforce,u8 packet_id,u8 * data,size_t len)155 void iforce_process_packet(struct iforce *iforce,
156 u8 packet_id, u8 *data, size_t len)
157 {
158 struct input_dev *dev = iforce->dev;
159 int i, j;
160
161 switch (packet_id) {
162
163 case 0x01: /* joystick position data */
164 input_report_abs(dev, ABS_X,
165 (__s16) get_unaligned_le16(data));
166 input_report_abs(dev, ABS_Y,
167 (__s16) get_unaligned_le16(data + 2));
168 input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
169
170 if (len >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
171 input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
172
173 iforce_report_hats_buttons(iforce, data);
174
175 input_sync(dev);
176 break;
177
178 case 0x03: /* wheel position data */
179 input_report_abs(dev, ABS_WHEEL,
180 (__s16) get_unaligned_le16(data));
181 input_report_abs(dev, ABS_GAS, 255 - data[2]);
182 input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
183
184 iforce_report_hats_buttons(iforce, data);
185
186 input_sync(dev);
187 break;
188
189 case 0x02: /* status report */
190 input_report_key(dev, BTN_DEAD, data[0] & 0x02);
191 input_sync(dev);
192
193 /* Check if an effect was just started or stopped */
194 i = data[1] & 0x7f;
195 if (data[1] & 0x80) {
196 if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
197 /* Report play event */
198 input_report_ff_status(dev, i, FF_STATUS_PLAYING);
199 }
200 } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
201 /* Report stop event */
202 input_report_ff_status(dev, i, FF_STATUS_STOPPED);
203 }
204
205 for (j = 3; j < len; j += 2)
206 mark_core_as_ready(iforce, get_unaligned_le16(data + j));
207
208 break;
209 }
210 }
211 EXPORT_SYMBOL(iforce_process_packet);
212