701 lines
17 KiB
C
701 lines
17 KiB
C
/*
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* Driver for the Gravis Grip Multiport, a gamepad "hub" that
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* connects up to four 9-pin digital gamepads/joysticks.
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* Driver tested on SMP and UP kernel versions 2.4.18-4 and 2.4.18-5.
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*
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* Thanks to Chris Gassib for helpful advice.
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*
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* Copyright (c) 2002 Brian Bonnlander, Bill Soudan
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* Copyright (c) 1998-2000 Vojtech Pavlik
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/gameport.h>
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#include <linux/input.h>
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#include <linux/delay.h>
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#include <linux/proc_fs.h>
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#include <linux/jiffies.h>
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#define DRIVER_DESC "Gravis Grip Multiport driver"
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MODULE_AUTHOR("Brian Bonnlander");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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#ifdef GRIP_DEBUG
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#define dbg(format, arg...) printk(KERN_ERR __FILE__ ": " format "\n" , ## arg)
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#else
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#define dbg(format, arg...) do {} while (0)
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#endif
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#define GRIP_MAX_PORTS 4
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/*
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* Grip multiport state
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*/
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struct grip_port {
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struct input_dev *dev;
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int mode;
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int registered;
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/* individual gamepad states */
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int buttons;
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int xaxes;
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int yaxes;
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int dirty; /* has the state been updated? */
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};
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struct grip_mp {
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struct gameport *gameport;
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struct grip_port *port[GRIP_MAX_PORTS];
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int reads;
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int bads;
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};
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/*
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* Multiport packet interpretation
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*/
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#define PACKET_FULL 0x80000000 /* packet is full */
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#define PACKET_IO_FAST 0x40000000 /* 3 bits per gameport read */
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#define PACKET_IO_SLOW 0x20000000 /* 1 bit per gameport read */
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#define PACKET_MP_MORE 0x04000000 /* multiport wants to send more */
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#define PACKET_MP_DONE 0x02000000 /* multiport done sending */
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/*
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* Packet status code interpretation
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*/
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#define IO_GOT_PACKET 0x0100 /* Got a packet */
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#define IO_MODE_FAST 0x0200 /* Used 3 data bits per gameport read */
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#define IO_SLOT_CHANGE 0x0800 /* Multiport physical slot status changed */
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#define IO_DONE 0x1000 /* Multiport is done sending packets */
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#define IO_RETRY 0x4000 /* Try again later to get packet */
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#define IO_RESET 0x8000 /* Force multiport to resend all packets */
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/*
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* Gamepad configuration data. Other 9-pin digital joystick devices
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* may work with the multiport, so this may not be an exhaustive list!
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* Commodore 64 joystick remains untested.
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*/
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#define GRIP_INIT_DELAY 2000 /* 2 ms */
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#define GRIP_MODE_NONE 0
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#define GRIP_MODE_RESET 1
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#define GRIP_MODE_GP 2
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#define GRIP_MODE_C64 3
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static const int grip_btn_gp[] = { BTN_TR, BTN_TL, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, -1 };
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static const int grip_btn_c64[] = { BTN_JOYSTICK, -1 };
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static const int grip_abs_gp[] = { ABS_X, ABS_Y, -1 };
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static const int grip_abs_c64[] = { ABS_X, ABS_Y, -1 };
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static const int *grip_abs[] = { NULL, NULL, grip_abs_gp, grip_abs_c64 };
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static const int *grip_btn[] = { NULL, NULL, grip_btn_gp, grip_btn_c64 };
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static const char *grip_name[] = { NULL, NULL, "Gravis Grip Pad", "Commodore 64 Joystick" };
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static const int init_seq[] = {
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1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1,
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1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
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1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1 };
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/* Maps multiport directional values to X,Y axis values (each axis encoded in 3 bits) */
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static const int axis_map[] = { 5, 9, 1, 5, 6, 10, 2, 6, 4, 8, 0, 4, 5, 9, 1, 5 };
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static int register_slot(int i, struct grip_mp *grip);
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/*
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* Returns whether an odd or even number of bits are on in pkt.
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*/
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static int bit_parity(u32 pkt)
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{
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int x = pkt ^ (pkt >> 16);
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x ^= x >> 8;
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x ^= x >> 4;
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x ^= x >> 2;
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x ^= x >> 1;
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return x & 1;
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}
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/*
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* Poll gameport; return true if all bits set in 'onbits' are on and
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* all bits set in 'offbits' are off.
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*/
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static inline int poll_until(u8 onbits, u8 offbits, int u_sec, struct gameport* gp, u8 *data)
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{
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int i, nloops;
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nloops = gameport_time(gp, u_sec);
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for (i = 0; i < nloops; i++) {
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*data = gameport_read(gp);
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if ((*data & onbits) == onbits &&
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(~(*data) & offbits) == offbits)
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return 1;
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}
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dbg("gameport timed out after %d microseconds.\n", u_sec);
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return 0;
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}
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/*
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* Gets a 28-bit packet from the multiport.
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*
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* After getting a packet successfully, commands encoded by sendcode may
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* be sent to the multiport.
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*
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* The multiport clock value is reflected in gameport bit B4.
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*
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* Returns a packet status code indicating whether packet is valid, the transfer
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* mode, and any error conditions.
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*
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* sendflags: current I/O status
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* sendcode: data to send to the multiport if sendflags is nonzero
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*/
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static int mp_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet)
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{
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u8 raw_data; /* raw data from gameport */
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u8 data_mask; /* packet data bits from raw_data */
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u32 pkt; /* packet temporary storage */
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int bits_per_read; /* num packet bits per gameport read */
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int portvals = 0; /* used for port value sanity check */
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int i;
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/* Gameport bits B0, B4, B5 should first be off, then B4 should come on. */
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*packet = 0;
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raw_data = gameport_read(gameport);
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if (raw_data & 1)
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return IO_RETRY;
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for (i = 0; i < 64; i++) {
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raw_data = gameport_read(gameport);
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portvals |= 1 << ((raw_data >> 4) & 3); /* Demux B4, B5 */
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}
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if (portvals == 1) { /* B4, B5 off */
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raw_data = gameport_read(gameport);
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portvals = raw_data & 0xf0;
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if (raw_data & 0x31)
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return IO_RESET;
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gameport_trigger(gameport);
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if (!poll_until(0x10, 0, 308, gameport, &raw_data))
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return IO_RESET;
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} else
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return IO_RETRY;
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/* Determine packet transfer mode and prepare for packet construction. */
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if (raw_data & 0x20) { /* 3 data bits/read */
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portvals |= raw_data >> 4; /* Compare B4-B7 before & after trigger */
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if (portvals != 0xb)
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return 0;
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data_mask = 7;
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bits_per_read = 3;
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pkt = (PACKET_FULL | PACKET_IO_FAST) >> 28;
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} else { /* 1 data bit/read */
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data_mask = 1;
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bits_per_read = 1;
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pkt = (PACKET_FULL | PACKET_IO_SLOW) >> 28;
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}
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/* Construct a packet. Final data bits must be zero. */
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while (1) {
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if (!poll_until(0, 0x10, 77, gameport, &raw_data))
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return IO_RESET;
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raw_data = (raw_data >> 5) & data_mask;
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if (pkt & PACKET_FULL)
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break;
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pkt = (pkt << bits_per_read) | raw_data;
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if (!poll_until(0x10, 0, 77, gameport, &raw_data))
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return IO_RESET;
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}
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if (raw_data)
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return IO_RESET;
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/* If 3 bits/read used, drop from 30 bits to 28. */
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if (bits_per_read == 3) {
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pkt = (pkt & 0xffff0000) | ((pkt << 1) & 0xffff);
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pkt = (pkt >> 2) | 0xf0000000;
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}
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if (bit_parity(pkt) == 1)
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return IO_RESET;
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/* Acknowledge packet receipt */
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if (!poll_until(0x30, 0, 77, gameport, &raw_data))
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return IO_RESET;
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raw_data = gameport_read(gameport);
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if (raw_data & 1)
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return IO_RESET;
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gameport_trigger(gameport);
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if (!poll_until(0, 0x20, 77, gameport, &raw_data))
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return IO_RESET;
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/* Return if we just wanted the packet or multiport wants to send more */
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*packet = pkt;
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if ((sendflags == 0) || ((sendflags & IO_RETRY) && !(pkt & PACKET_MP_DONE)))
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return IO_GOT_PACKET;
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if (pkt & PACKET_MP_MORE)
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return IO_GOT_PACKET | IO_RETRY;
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/* Multiport is done sending packets and is ready to receive data */
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if (!poll_until(0x20, 0, 77, gameport, &raw_data))
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return IO_GOT_PACKET | IO_RESET;
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raw_data = gameport_read(gameport);
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if (raw_data & 1)
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return IO_GOT_PACKET | IO_RESET;
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/* Trigger gameport based on bits in sendcode */
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gameport_trigger(gameport);
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do {
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if (!poll_until(0x20, 0x10, 116, gameport, &raw_data))
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return IO_GOT_PACKET | IO_RESET;
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if (!poll_until(0x30, 0, 193, gameport, &raw_data))
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return IO_GOT_PACKET | IO_RESET;
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if (raw_data & 1)
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return IO_GOT_PACKET | IO_RESET;
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if (sendcode & 1)
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gameport_trigger(gameport);
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sendcode >>= 1;
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} while (sendcode);
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return IO_GOT_PACKET | IO_MODE_FAST;
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}
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/*
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* Disables and restores interrupts for mp_io(), which does the actual I/O.
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*/
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static int multiport_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet)
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{
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int status;
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unsigned long flags;
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local_irq_save(flags);
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status = mp_io(gameport, sendflags, sendcode, packet);
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local_irq_restore(flags);
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return status;
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}
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/*
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* Puts multiport into digital mode. Multiport LED turns green.
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*
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* Returns true if a valid digital packet was received, false otherwise.
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*/
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static int dig_mode_start(struct gameport *gameport, u32 *packet)
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{
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int i;
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int flags, tries = 0, bads = 0;
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for (i = 0; i < ARRAY_SIZE(init_seq); i++) { /* Send magic sequence */
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if (init_seq[i])
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gameport_trigger(gameport);
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udelay(GRIP_INIT_DELAY);
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}
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for (i = 0; i < 16; i++) /* Wait for multiport to settle */
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udelay(GRIP_INIT_DELAY);
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while (tries < 64 && bads < 8) { /* Reset multiport and try getting a packet */
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flags = multiport_io(gameport, IO_RESET, 0x27, packet);
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if (flags & IO_MODE_FAST)
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return 1;
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if (flags & IO_RETRY)
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tries++;
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else
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bads++;
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}
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return 0;
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}
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/*
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* Packet structure: B0-B15 => gamepad state
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* B16-B20 => gamepad device type
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* B21-B24 => multiport slot index (1-4)
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*
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* Known device types: 0x1f (grip pad), 0x0 (no device). Others may exist.
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*
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* Returns the packet status.
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*/
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static int get_and_decode_packet(struct grip_mp *grip, int flags)
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{
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struct grip_port *port;
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u32 packet;
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int joytype = 0;
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int slot;
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/* Get a packet and check for validity */
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flags &= IO_RESET | IO_RETRY;
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flags = multiport_io(grip->gameport, flags, 0, &packet);
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grip->reads++;
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if (packet & PACKET_MP_DONE)
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flags |= IO_DONE;
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if (flags && !(flags & IO_GOT_PACKET)) {
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grip->bads++;
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return flags;
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}
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/* Ignore non-gamepad packets, e.g. multiport hardware version */
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slot = ((packet >> 21) & 0xf) - 1;
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if ((slot < 0) || (slot > 3))
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return flags;
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port = grip->port[slot];
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/*
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* Handle "reset" packets, which occur at startup, and when gamepads
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* are removed or plugged in. May contain configuration of a new gamepad.
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*/
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joytype = (packet >> 16) & 0x1f;
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if (!joytype) {
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if (port->registered) {
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printk(KERN_INFO "grip_mp: removing %s, slot %d\n",
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grip_name[port->mode], slot);
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input_unregister_device(port->dev);
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port->registered = 0;
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}
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dbg("Reset: grip multiport slot %d\n", slot);
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port->mode = GRIP_MODE_RESET;
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flags |= IO_SLOT_CHANGE;
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return flags;
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}
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/* Interpret a grip pad packet */
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if (joytype == 0x1f) {
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int dir = (packet >> 8) & 0xf; /* eight way directional value */
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port->buttons = (~packet) & 0xff;
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port->yaxes = ((axis_map[dir] >> 2) & 3) - 1;
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port->xaxes = (axis_map[dir] & 3) - 1;
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port->dirty = 1;
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if (port->mode == GRIP_MODE_RESET)
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flags |= IO_SLOT_CHANGE;
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port->mode = GRIP_MODE_GP;
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if (!port->registered) {
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dbg("New Grip pad in multiport slot %d.\n", slot);
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if (register_slot(slot, grip)) {
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port->mode = GRIP_MODE_RESET;
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port->dirty = 0;
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}
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}
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return flags;
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}
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/* Handle non-grip device codes. For now, just print diagnostics. */
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{
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static int strange_code = 0;
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if (strange_code != joytype) {
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printk(KERN_INFO "Possible non-grip pad/joystick detected.\n");
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printk(KERN_INFO "Got joy type 0x%x and packet 0x%x.\n", joytype, packet);
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strange_code = joytype;
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}
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}
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return flags;
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}
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/*
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* Returns true if all multiport slot states appear valid.
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*/
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static int slots_valid(struct grip_mp *grip)
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{
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int flags, slot, invalid = 0, active = 0;
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flags = get_and_decode_packet(grip, 0);
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if (!(flags & IO_GOT_PACKET))
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return 0;
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for (slot = 0; slot < 4; slot++) {
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if (grip->port[slot]->mode == GRIP_MODE_RESET)
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invalid = 1;
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if (grip->port[slot]->mode != GRIP_MODE_NONE)
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active = 1;
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}
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/* Return true if no active slot but multiport sent all its data */
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if (!active)
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return (flags & IO_DONE) ? 1 : 0;
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/* Return false if invalid device code received */
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return invalid ? 0 : 1;
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}
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/*
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* Returns whether the multiport was placed into digital mode and
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* able to communicate its state successfully.
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*/
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static int multiport_init(struct grip_mp *grip)
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{
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int dig_mode, initialized = 0, tries = 0;
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u32 packet;
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dig_mode = dig_mode_start(grip->gameport, &packet);
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while (!dig_mode && tries < 4) {
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dig_mode = dig_mode_start(grip->gameport, &packet);
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tries++;
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}
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if (dig_mode)
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dbg("multiport_init(): digital mode activated.\n");
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else {
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dbg("multiport_init(): unable to activate digital mode.\n");
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return 0;
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}
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/* Get packets, store multiport state, and check state's validity */
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for (tries = 0; tries < 4096; tries++) {
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if (slots_valid(grip)) {
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initialized = 1;
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break;
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}
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}
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dbg("multiport_init(): initialized == %d\n", initialized);
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return initialized;
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}
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/*
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* Reports joystick state to the linux input layer.
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*/
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static void report_slot(struct grip_mp *grip, int slot)
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{
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struct grip_port *port = grip->port[slot];
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int i;
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/* Store button states with linux input driver */
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for (i = 0; i < 8; i++)
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input_report_key(port->dev, grip_btn_gp[i], (port->buttons >> i) & 1);
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/* Store axis states with linux driver */
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input_report_abs(port->dev, ABS_X, port->xaxes);
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input_report_abs(port->dev, ABS_Y, port->yaxes);
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/* Tell the receiver of the events to process them */
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|
|
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,
|
|
};
|
|
|
|
static int __init grip_init(void)
|
|
{
|
|
return gameport_register_driver(&grip_drv);
|
|
}
|
|
|
|
static void __exit grip_exit(void)
|
|
{
|
|
gameport_unregister_driver(&grip_drv);
|
|
}
|
|
|
|
module_init(grip_init);
|
|
module_exit(grip_exit);
|