| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Vojtech Pavlik | 2621 | 86.99% | 2 | 10.00% |
| Dmitry Torokhov | 362 | 12.01% | 9 | 45.00% |
| Grzegorz Jaskiewicz | 12 | 0.40% | 1 | 5.00% |
| Al Viro | 4 | 0.13% | 1 | 5.00% |
| Andi Drebes | 4 | 0.13% | 1 | 5.00% |
| Tim Schmielau | 3 | 0.10% | 1 | 5.00% |
| Axel Lin | 2 | 0.07% | 1 | 5.00% |
| Jiri Slaby | 2 | 0.07% | 1 | 5.00% |
| Adrian Bunk | 1 | 0.03% | 1 | 5.00% |
| Thomas Gleixner | 1 | 0.03% | 1 | 5.00% |
| Pekka J Enberg | 1 | 0.03% | 1 | 5.00% |
| Total | 3013 | 20 |
// SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Gravis Grip Multiport, a gamepad "hub" that * connects up to four 9-pin digital gamepads/joysticks. * Driver tested on SMP and UP kernel versions 2.4.18-4 and 2.4.18-5. * * Thanks to Chris Gassib for helpful advice. * * Copyright (c) 2002 Brian Bonnlander, Bill Soudan * Copyright (c) 1998-2000 Vojtech Pavlik */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/gameport.h> #include <linux/input.h> #include <linux/delay.h> #include <linux/proc_fs.h> #include <linux/jiffies.h> #define DRIVER_DESC "Gravis Grip Multiport driver" MODULE_AUTHOR("Brian Bonnlander"); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); #ifdef GRIP_DEBUG #define dbg(format, arg...) printk(KERN_ERR __FILE__ ": " format "\n" , ## arg) #else #define dbg(format, arg...) do {} while (0) #endif #define GRIP_MAX_PORTS 4 /* * Grip multiport state */ struct grip_port { struct input_dev *dev; int mode; int registered; /* individual gamepad states */ int buttons; int xaxes; int yaxes; int dirty; /* has the state been updated? */ }; struct grip_mp { struct gameport *gameport; struct grip_port *port[GRIP_MAX_PORTS]; int reads; int bads; }; /* * Multiport packet interpretation */ #define PACKET_FULL 0x80000000 /* packet is full */ #define PACKET_IO_FAST 0x40000000 /* 3 bits per gameport read */ #define PACKET_IO_SLOW 0x20000000 /* 1 bit per gameport read */ #define PACKET_MP_MORE 0x04000000 /* multiport wants to send more */ #define PACKET_MP_DONE 0x02000000 /* multiport done sending */ /* * Packet status code interpretation */ #define IO_GOT_PACKET 0x0100 /* Got a packet */ #define IO_MODE_FAST 0x0200 /* Used 3 data bits per gameport read */ #define IO_SLOT_CHANGE 0x0800 /* Multiport physical slot status changed */ #define IO_DONE 0x1000 /* Multiport is done sending packets */ #define IO_RETRY 0x4000 /* Try again later to get packet */ #define IO_RESET 0x8000 /* Force multiport to resend all packets */ /* * Gamepad configuration data. Other 9-pin digital joystick devices * may work with the multiport, so this may not be an exhaustive list! * Commodore 64 joystick remains untested. */ #define GRIP_INIT_DELAY 2000 /* 2 ms */ #define GRIP_MODE_NONE 0 #define GRIP_MODE_RESET 1 #define GRIP_MODE_GP 2 #define GRIP_MODE_C64 3 static const int grip_btn_gp[] = { BTN_TR, BTN_TL, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, -1 }; static const int grip_btn_c64[] = { BTN_JOYSTICK, -1 }; static const int grip_abs_gp[] = { ABS_X, ABS_Y, -1 }; static const int grip_abs_c64[] = { ABS_X, ABS_Y, -1 }; static const int *grip_abs[] = { NULL, NULL, grip_abs_gp, grip_abs_c64 }; static const int *grip_btn[] = { NULL, NULL, grip_btn_gp, grip_btn_c64 }; static const char *grip_name[] = { NULL, NULL, "Gravis Grip Pad", "Commodore 64 Joystick" }; static const int init_seq[] = { 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1 }; /* Maps multiport directional values to X,Y axis values (each axis encoded in 3 bits) */ static const int axis_map[] = { 5, 9, 1, 5, 6, 10, 2, 6, 4, 8, 0, 4, 5, 9, 1, 5 }; static int register_slot(int i, struct grip_mp *grip); /* * Returns whether an odd or even number of bits are on in pkt. */ static int bit_parity(u32 pkt) { int x = pkt ^ (pkt >> 16); x ^= x >> 8; x ^= x >> 4; x ^= x >> 2; x ^= x >> 1; return x & 1; } /* * Poll gameport; return true if all bits set in 'onbits' are on and * all bits set in 'offbits' are off. */ static inline int poll_until(u8 onbits, u8 offbits, int u_sec, struct gameport* gp, u8 *data) { int i, nloops; nloops = gameport_time(gp, u_sec); for (i = 0; i < nloops; i++) { *data = gameport_read(gp); if ((*data & onbits) == onbits && (~(*data) & offbits) == offbits) return 1; } dbg("gameport timed out after %d microseconds.\n", u_sec); return 0; } /* * Gets a 28-bit packet from the multiport. * * After getting a packet successfully, commands encoded by sendcode may * be sent to the multiport. * * The multiport clock value is reflected in gameport bit B4. * * Returns a packet status code indicating whether packet is valid, the transfer * mode, and any error conditions. * * sendflags: current I/O status * sendcode: data to send to the multiport if sendflags is nonzero */ static int mp_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet) { u8 raw_data; /* raw data from gameport */ u8 data_mask; /* packet data bits from raw_data */ u32 pkt; /* packet temporary storage */ int bits_per_read; /* num packet bits per gameport read */ int portvals = 0; /* used for port value sanity check */ int i; /* Gameport bits B0, B4, B5 should first be off, then B4 should come on. */ *packet = 0; raw_data = gameport_read(gameport); if (raw_data & 1) return IO_RETRY; for (i = 0; i < 64; i++) { raw_data = gameport_read(gameport); portvals |= 1 << ((raw_data >> 4) & 3); /* Demux B4, B5 */ } if (portvals == 1) { /* B4, B5 off */ raw_data = gameport_read(gameport); portvals = raw_data & 0xf0; if (raw_data & 0x31) return IO_RESET; gameport_trigger(gameport); if (!poll_until(0x10, 0, 308, gameport, &raw_data)) return IO_RESET; } else return IO_RETRY; /* Determine packet transfer mode and prepare for packet construction. */ if (raw_data & 0x20) { /* 3 data bits/read */ portvals |= raw_data >> 4; /* Compare B4-B7 before & after trigger */ if (portvals != 0xb) return 0; data_mask = 7; bits_per_read = 3; pkt = (PACKET_FULL | PACKET_IO_FAST) >> 28; } else { /* 1 data bit/read */ data_mask = 1; bits_per_read = 1; pkt = (PACKET_FULL | PACKET_IO_SLOW) >> 28; } /* Construct a packet. Final data bits must be zero. */ while (1) { if (!poll_until(0, 0x10, 77, gameport, &raw_data)) return IO_RESET; raw_data = (raw_data >> 5) & data_mask; if (pkt & PACKET_FULL) break; pkt = (pkt << bits_per_read) | raw_data; if (!poll_until(0x10, 0, 77, gameport, &raw_data)) return IO_RESET; } if (raw_data) return IO_RESET; /* If 3 bits/read used, drop from 30 bits to 28. */ if (bits_per_read == 3) { pkt = (pkt & 0xffff0000) | ((pkt << 1) & 0xffff); pkt = (pkt >> 2) | 0xf0000000; } if (bit_parity(pkt) == 1) return IO_RESET; /* Acknowledge packet receipt */ if (!poll_until(0x30, 0, 77, gameport, &raw_data)) return IO_RESET; raw_data = gameport_read(gameport); if (raw_data & 1) return IO_RESET; gameport_trigger(gameport); if (!poll_until(0, 0x20, 77, gameport, &raw_data)) return IO_RESET; /* Return if we just wanted the packet or multiport wants to send more */ *packet = pkt; if ((sendflags == 0) || ((sendflags & IO_RETRY) && !(pkt & PACKET_MP_DONE))) return IO_GOT_PACKET; if (pkt & PACKET_MP_MORE) return IO_GOT_PACKET | IO_RETRY; /* Multiport is done sending packets and is ready to receive data */ if (!poll_until(0x20, 0, 77, gameport, &raw_data)) return IO_GOT_PACKET | IO_RESET; raw_data = gameport_read(gameport); if (raw_data & 1) return IO_GOT_PACKET | IO_RESET; /* Trigger gameport based on bits in sendcode */ gameport_trigger(gameport); do { if (!poll_until(0x20, 0x10, 116, gameport, &raw_data)) return IO_GOT_PACKET | IO_RESET; if (!poll_until(0x30, 0, 193, gameport, &raw_data)) return IO_GOT_PACKET | IO_RESET; if (raw_data & 1) return IO_GOT_PACKET | IO_RESET; if (sendcode & 1) gameport_trigger(gameport); sendcode >>= 1; } while (sendcode); return IO_GOT_PACKET | IO_MODE_FAST; } /* * Disables and restores interrupts for mp_io(), which does the actual I/O. */ static int multiport_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet) { int status; unsigned long flags; local_irq_save(flags); status = mp_io(gameport, sendflags, sendcode, packet); local_irq_restore(flags); return status; } /* * Puts multiport into digital mode. Multiport LED turns green. * * Returns true if a valid digital packet was received, false otherwise. */ static int dig_mode_start(struct gameport *gameport, u32 *packet) { int i; int flags, tries = 0, bads = 0; for (i = 0; i < ARRAY_SIZE(init_seq); i++) { /* Send magic sequence */ if (init_seq[i]) gameport_trigger(gameport); udelay(GRIP_INIT_DELAY); } for (i = 0; i < 16; i++) /* Wait for multiport to settle */ udelay(GRIP_INIT_DELAY); while (tries < 64 && bads < 8) { /* Reset multiport and try getting a packet */ flags = multiport_io(gameport, IO_RESET, 0x27, packet); if (flags & IO_MODE_FAST) return 1; if (flags & IO_RETRY) tries++; else bads++; } return 0; } /* * Packet structure: B0-B15 => gamepad state * B16-B20 => gamepad device type * B21-B24 => multiport slot index (1-4) * * Known device types: 0x1f (grip pad), 0x0 (no device). Others may exist. * * Returns the packet status. */ static int get_and_decode_packet(struct grip_mp *grip, int flags) { struct grip_port *port; u32 packet; int joytype = 0; int slot; /* Get a packet and check for validity */ flags &= IO_RESET | IO_RETRY; flags = multiport_io(grip->gameport, flags, 0, &packet); grip->reads++; if (packet & PACKET_MP_DONE) flags |= IO_DONE; if (flags && !(flags & IO_GOT_PACKET)) { grip->bads++; return flags; } /* Ignore non-gamepad packets, e.g. multiport hardware version */ slot = ((packet >> 21) & 0xf) - 1; if ((slot < 0) || (slot > 3)) return flags; port = grip->port[slot]; /* * Handle "reset" packets, which occur at startup, and when gamepads * are removed or plugged in. May contain configuration of a new gamepad. */ joytype = (packet >> 16) & 0x1f; if (!joytype) { if (port->registered) { printk(KERN_INFO "grip_mp: removing %s, slot %d\n", grip_name[port->mode], slot); input_unregister_device(port->dev); port->registered = 0; } dbg("Reset: grip multiport slot %d\n", slot); port->mode = GRIP_MODE_RESET; flags |= IO_SLOT_CHANGE; return flags; } /* Interpret a grip pad packet */ if (joytype == 0x1f) { int dir = (packet >> 8) & 0xf; /* eight way directional value */ port->buttons = (~packet) & 0xff; port->yaxes = ((axis_map[dir] >> 2) & 3) - 1; port->xaxes = (axis_map[dir] & 3) - 1; port->dirty = 1; if (port->mode == GRIP_MODE_RESET) flags |= IO_SLOT_CHANGE; port->mode = GRIP_MODE_GP; if (!port->registered) { dbg("New Grip pad in multiport slot %d.\n", slot); if (register_slot(slot, grip)) { port->mode = GRIP_MODE_RESET; port->dirty = 0; } } return flags; } /* Handle non-grip device codes. For now, just print diagnostics. */ { static int strange_code = 0; if (strange_code != joytype) { printk(KERN_INFO "Possible non-grip pad/joystick detected.\n"); printk(KERN_INFO "Got joy type 0x%x and packet 0x%x.\n", joytype, packet); strange_code = joytype; } } return flags; } /* * Returns true if all multiport slot states appear valid. */ static int slots_valid(struct grip_mp *grip) { int flags, slot, invalid = 0, active = 0; flags = get_and_decode_packet(grip, 0); if (!(flags & IO_GOT_PACKET)) return 0; for (slot = 0; slot < 4; slot++) { if (grip->port[slot]->mode == GRIP_MODE_RESET) invalid = 1; if (grip->port[slot]->mode != GRIP_MODE_NONE) active = 1; } /* Return true if no active slot but multiport sent all its data */ if (!active) return (flags & IO_DONE) ? 1 : 0; /* Return false if invalid device code received */ return invalid ? 0 : 1; } /* * Returns whether the multiport was placed into digital mode and * able to communicate its state successfully. */ static int multiport_init(struct grip_mp *grip) { int dig_mode, initialized = 0, tries = 0; u32 packet; dig_mode = dig_mode_start(grip->gameport, &packet); while (!dig_mode && tries < 4) { dig_mode = dig_mode_start(grip->gameport, &packet); tries++; } if (dig_mode) dbg("multiport_init(): digital mode activated.\n"); else { dbg("multiport_init(): unable to activate digital mode.\n"); return 0; } /* Get packets, store multiport state, and check state's validity */ for (tries = 0; tries < 4096; tries++) { if (slots_valid(grip)) { initialized = 1; break; } } dbg("multiport_init(): initialized == %d\n", initialized); return initialized; } /* * Reports joystick state to the linux input layer. */ static void report_slot(struct grip_mp *grip, int slot) { struct grip_port *port = grip->port[slot]; int i; /* Store button states with linux input driver */ for (i = 0; i < 8; i++) input_report_key(port->dev, grip_btn_gp[i], (port->buttons >> i) & 1); /* Store axis states with linux driver */ input_report_abs(port->dev, ABS_X, port->xaxes); input_report_abs(port->dev, ABS_Y, port->yaxes); /* Tell the receiver of the events to process them */ input_sync(port->dev); port->dirty = 0; } /* * Get the multiport state. */ static void grip_poll(struct gameport *gameport) { struct grip_mp *grip = gameport_get_drvdata(gameport); int i, npkts, flags; for (npkts = 0; npkts < 4; npkts++) { flags = IO_RETRY; for (i = 0; i < 32; i++) { flags = get_and_decode_packet(grip, flags); if ((flags & IO_GOT_PACKET) || !(flags & IO_RETRY)) break; } if (flags & IO_DONE) break; } for (i = 0; i < 4; i++) if (grip->port[i]->dirty) report_slot(grip, i); } /* * Called when a joystick device file is opened */ static int grip_open(struct input_dev *dev) { struct grip_mp *grip = input_get_drvdata(dev); gameport_start_polling(grip->gameport); return 0; } /* * Called when a joystick device file is closed */ static void grip_close(struct input_dev *dev) { struct grip_mp *grip = input_get_drvdata(dev); gameport_stop_polling(grip->gameport); } /* * Tell the linux input layer about a newly plugged-in gamepad. */ static int register_slot(int slot, struct grip_mp *grip) { struct grip_port *port = grip->port[slot]; struct input_dev *input_dev; int j, t; int err; port->dev = input_dev = input_allocate_device(); if (!input_dev) return -ENOMEM; input_dev->name = grip_name[port->mode]; input_dev->id.bustype = BUS_GAMEPORT; input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS; input_dev->id.product = 0x0100 + port->mode; input_dev->id.version = 0x0100; input_dev->dev.parent = &grip->gameport->dev; input_set_drvdata(input_dev, grip); input_dev->open = grip_open; input_dev->close = grip_close; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); for (j = 0; (t = grip_abs[port->mode][j]) >= 0; j++) input_set_abs_params(input_dev, t, -1, 1, 0, 0); for (j = 0; (t = grip_btn[port->mode][j]) >= 0; j++) if (t > 0) set_bit(t, input_dev->keybit); err = input_register_device(port->dev); if (err) { input_free_device(port->dev); return err; } port->registered = 1; if (port->dirty) /* report initial state, if any */ report_slot(grip, slot); return 0; } static int grip_connect(struct gameport *gameport, struct gameport_driver *drv) { struct grip_mp *grip; int err; if (!(grip = kzalloc(sizeof(struct grip_mp), GFP_KERNEL))) return -ENOMEM; grip->gameport = gameport; gameport_set_drvdata(gameport, grip); err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW); if (err) goto fail1; gameport_set_poll_handler(gameport, grip_poll); gameport_set_poll_interval(gameport, 20); if (!multiport_init(grip)) { err = -ENODEV; goto fail2; } if (!grip->port[0]->mode && !grip->port[1]->mode && !grip->port[2]->mode && !grip->port[3]->mode) { /* nothing plugged in */ err = -ENODEV; goto fail2; } return 0; fail2: gameport_close(gameport); fail1: gameport_set_drvdata(gameport, NULL); kfree(grip); return err; } static void grip_disconnect(struct gameport *gameport) { struct grip_mp *grip = gameport_get_drvdata(gameport); int i; for (i = 0; i < 4; i++) if (grip->port[i]->registered) input_unregister_device(grip->port[i]->dev); gameport_close(gameport); gameport_set_drvdata(gameport, NULL); kfree(grip); } static struct gameport_driver grip_drv = { .driver = { .name = "grip_mp", }, .description = DRIVER_DESC, .connect = grip_connect, .disconnect = grip_disconnect, }; module_gameport_driver(grip_drv);
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