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 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 */ 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 */ 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 */ 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 } 111 112 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 } 147 148 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