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