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