diff options
Diffstat (limited to 'drivers/input/joystick/iforce/iforce-packets.c')
| -rw-r--r-- | drivers/input/joystick/iforce/iforce-packets.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/input/joystick/iforce/iforce-packets.c b/drivers/input/joystick/iforce/iforce-packets.c new file mode 100644 index 000000000..763642c8c --- /dev/null +++ b/drivers/input/joystick/iforce/iforce-packets.c @@ -0,0 +1,211 @@ +// 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); |