/drivers/input/joystick/iforce/iforce-packets.c
http://github.com/mirrors/linux · C · 211 lines · 145 code · 39 blank · 27 comment · 29 complexity · efb85575081a580bebc68c85de431a7a MD5 · raw file
- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
- * Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
- *
- * USB/RS232 I-Force joysticks and wheels.
- */
- #include <asm/unaligned.h>
- #include "iforce.h"
- static struct {
- __s32 x;
- __s32 y;
- } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
- void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data)
- {
- dev_dbg(iforce->dev->dev.parent, "%s %s cmd = %04x, data = %*ph\n",
- __func__, msg, cmd, LO(cmd), data);
- }
- /*
- * Send a packet of bytes to the device
- */
- int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
- {
- /* Copy data to buffer */
- int n = LO(cmd);
- int c;
- int empty;
- int head, tail;
- unsigned long flags;
- /*
- * Update head and tail of xmit buffer
- */
- spin_lock_irqsave(&iforce->xmit_lock, flags);
- head = iforce->xmit.head;
- tail = iforce->xmit.tail;
- if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
- dev_warn(&iforce->dev->dev,
- "not enough space in xmit buffer to send new packet\n");
- spin_unlock_irqrestore(&iforce->xmit_lock, flags);
- return -1;
- }
- empty = head == tail;
- XMIT_INC(iforce->xmit.head, n+2);
- /*
- * Store packet in xmit buffer
- */
- iforce->xmit.buf[head] = HI(cmd);
- XMIT_INC(head, 1);
- iforce->xmit.buf[head] = LO(cmd);
- XMIT_INC(head, 1);
- c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
- if (n < c) c=n;
- memcpy(&iforce->xmit.buf[head],
- data,
- c);
- if (n != c) {
- memcpy(&iforce->xmit.buf[0],
- data + c,
- n - c);
- }
- XMIT_INC(head, n);
- spin_unlock_irqrestore(&iforce->xmit_lock, flags);
- /*
- * If necessary, start the transmission
- */
- if (empty)
- iforce->xport_ops->xmit(iforce);
- return 0;
- }
- EXPORT_SYMBOL(iforce_send_packet);
- /* Start or stop an effect */
- int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
- {
- unsigned char data[3];
- data[0] = LO(id);
- data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
- data[2] = LO(value);
- return iforce_send_packet(iforce, FF_CMD_PLAY, data);
- }
- /* Mark an effect that was being updated as ready. That means it can be updated
- * again */
- static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
- {
- int i;
- if (!iforce->dev->ff)
- return 0;
- for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
- if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
- (iforce->core_effects[i].mod1_chunk.start == addr ||
- iforce->core_effects[i].mod2_chunk.start == addr)) {
- clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
- return 0;
- }
- }
- dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
- return -1;
- }
- static void iforce_report_hats_buttons(struct iforce *iforce, u8 *data)
- {
- struct input_dev *dev = iforce->dev;
- int i;
- input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
- input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
- for (i = 0; iforce->type->btn[i] >= 0; i++)
- input_report_key(dev, iforce->type->btn[i],
- data[(i >> 3) + 5] & (1 << (i & 7)));
- /* If there are untouched bits left, interpret them as the second hat */
- if (i <= 8) {
- u8 btns = data[6];
- if (test_bit(ABS_HAT1X, dev->absbit)) {
- if (btns & BIT(3))
- input_report_abs(dev, ABS_HAT1X, -1);
- else if (btns & BIT(1))
- input_report_abs(dev, ABS_HAT1X, 1);
- else
- input_report_abs(dev, ABS_HAT1X, 0);
- }
- if (test_bit(ABS_HAT1Y, dev->absbit)) {
- if (btns & BIT(0))
- input_report_abs(dev, ABS_HAT1Y, -1);
- else if (btns & BIT(2))
- input_report_abs(dev, ABS_HAT1Y, 1);
- else
- input_report_abs(dev, ABS_HAT1Y, 0);
- }
- }
- }
- void iforce_process_packet(struct iforce *iforce,
- u8 packet_id, u8 *data, size_t len)
- {
- struct input_dev *dev = iforce->dev;
- int i, j;
- switch (packet_id) {
- case 0x01: /* joystick position data */
- input_report_abs(dev, ABS_X,
- (__s16) get_unaligned_le16(data));
- input_report_abs(dev, ABS_Y,
- (__s16) get_unaligned_le16(data + 2));
- input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
- if (len >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
- input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
- iforce_report_hats_buttons(iforce, data);
- input_sync(dev);
- break;
- case 0x03: /* wheel position data */
- input_report_abs(dev, ABS_WHEEL,
- (__s16) get_unaligned_le16(data));
- input_report_abs(dev, ABS_GAS, 255 - data[2]);
- input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
- iforce_report_hats_buttons(iforce, data);
- input_sync(dev);
- break;
- case 0x02: /* status report */
- input_report_key(dev, BTN_DEAD, data[0] & 0x02);
- input_sync(dev);
- /* Check if an effect was just started or stopped */
- i = data[1] & 0x7f;
- if (data[1] & 0x80) {
- if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
- /* Report play event */
- input_report_ff_status(dev, i, FF_STATUS_PLAYING);
- }
- } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
- /* Report stop event */
- input_report_ff_status(dev, i, FF_STATUS_STOPPED);
- }
- for (j = 3; j < len; j += 2)
- mark_core_as_ready(iforce, get_unaligned_le16(data + j));
- break;
- }
- }
- EXPORT_SYMBOL(iforce_process_packet);