cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/joystick/grip.c

/*
 *  Copyright (c) 1998-2001 Vojtech Pavlik
 */

/*
 * Gravis/Kensington GrIP protocol joystick and gamepad driver for Linux
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/input.h>
#include <linux/jiffies.h>


#define DRIVER_DESC	"Gravis GrIP protocol joystick driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");


#define GRIP_MODE_GPP		1

#define GRIP_MODE_BD		2

#define GRIP_MODE_XT		3

#define GRIP_MODE_DC		4


#define GRIP_LENGTH_GPP		24

#define GRIP_STROBE_GPP		200	
/* 200 us */

#define GRIP_LENGTH_XT		4

#define GRIP_STROBE_XT		64	
/* 64 us */

#define GRIP_MAX_CHUNKS_XT	10

#define GRIP_MAX_BITS_XT	30


struct grip {
	
struct gameport *gameport;
	
struct input_dev *dev[2];
	
unsigned char mode[2];
	
int reads;
	
int bads;
	
char phys[2][32];
};


static int grip_btn_gpp[] = { BTN_START, BTN_SELECT, BTN_TR2, BTN_Y, 0, BTN_TL2, BTN_A, BTN_B, BTN_X, 0, BTN_TL, BTN_TR, -1 };

static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 };

static int grip_btn_xt[] = { BTN_TRIGGER, BTN_THUMB, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_SELECT, BTN_START, BTN_MODE, -1 };

static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 };


static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 };

static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };

static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 };

static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };


static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital",
				"Gravis Xterminator Digital", "Gravis Xterminator DualControl" };

static int *grip_abs[] = { NULL, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc };

static int *grip_btn[] = { NULL, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc };

static char grip_anx[] = { 0, 0, 3, 5, 5 };

static char grip_cen[] = { 0, 0, 2, 2, 4 };

/*
 * grip_gpp_read_packet() reads a Gravis GamePad Pro packet.
 */


static int grip_gpp_read_packet(struct gameport *gameport, int shift, unsigned int *data) { unsigned long flags; unsigned char u, v; unsigned int t; int i; int strobe = gameport_time(gameport, GRIP_STROBE_GPP); data[0] = 0; t = strobe; i = 0; local_irq_save(flags); v = gameport_read(gameport) >> shift; do { t--; u = v; v = (gameport_read(gameport) >> shift) & 3; if (~v & u & 1) { data[0] |= (v >> 1) << i++; t = strobe; } } while (i < GRIP_LENGTH_GPP && t > 0); local_irq_restore(flags); if (i < GRIP_LENGTH_GPP) return -1; for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++) data[0] = data[0] >> 1 | (data[0] & 1) << (GRIP_LENGTH_GPP - 1); return -(i == GRIP_LENGTH_GPP); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)21099.06%360.00%
Ingo Molnar20.94%240.00%
Total212100.00%5100.00%

/* * grip_xt_read_packet() reads a Gravis Xterminator packet. */
static int grip_xt_read_packet(struct gameport *gameport, int shift, unsigned int *data) { unsigned int i, j, buf, crc; unsigned char u, v, w; unsigned long flags; unsigned int t; char status; int strobe = gameport_time(gameport, GRIP_STROBE_XT); data[0] = data[1] = data[2] = data[3] = 0; status = buf = i = j = 0; t = strobe; local_irq_save(flags); v = w = (gameport_read(gameport) >> shift) & 3; do { t--; u = (gameport_read(gameport) >> shift) & 3; if (u ^ v) { if ((u ^ v) & 1) { buf = (buf << 1) | (u >> 1); t = strobe; i++; } else if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) { if (i == 20) { crc = buf ^ (buf >> 7) ^ (buf >> 14); if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) { data[buf >> 18] = buf >> 4; status |= 1 << (buf >> 18); } j++; } t = strobe; buf = 0; i = 0; } w = v; v = u; } } while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0); local_irq_restore(flags); return -(status != 0xf); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)33399.40%360.00%
Ingo Molnar20.60%240.00%
Total335100.00%5100.00%

/* * grip_timer() repeatedly polls the joysticks and generates events. */
static void grip_poll(struct gameport *gameport) { struct grip *grip = gameport_get_drvdata(gameport); unsigned int data[GRIP_LENGTH_XT]; struct input_dev *dev; int i, j; for (i = 0; i < 2; i++) { dev = grip->dev[i]; if (!dev) continue; grip->reads++; switch (grip->mode[i]) { case GRIP_MODE_GPP: if (grip_gpp_read_packet(grip->gameport, (i << 1) + 4, data)) { grip->bads++; break; } input_report_abs(dev, ABS_X, ((*data >> 15) & 1) - ((*data >> 16) & 1)); input_report_abs(dev, ABS_Y, ((*data >> 13) & 1) - ((*data >> 12) & 1)); for (j = 0; j < 12; j++) if (grip_btn_gpp[j]) input_report_key(dev, grip_btn_gpp[j], (*data >> j) & 1); break; case GRIP_MODE_BD: if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) { grip->bads++; break; } input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f); input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f)); input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f); input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1)); input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1)); for (j = 0; j < 5; j++) input_report_key(dev, grip_btn_bd[j], (data[3] >> (j + 4)) & 1); break; case GRIP_MODE_XT: if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) { grip->bads++; break; } input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f); input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f)); input_report_abs(dev, ABS_BRAKE, (data[1] >> 2) & 0x3f); input_report_abs(dev, ABS_GAS, (data[1] >> 8) & 0x3f); input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f); input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1)); input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1)); input_report_abs(dev, ABS_HAT1X, ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1)); input_report_abs(dev, ABS_HAT1Y, ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1)); for (j = 0; j < 11; j++) input_report_key(dev, grip_btn_xt[j], (data[3] >> (j + 3)) & 1); break; case GRIP_MODE_DC: if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) { grip->bads++; break; } input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f); input_report_abs(dev, ABS_Y, (data[0] >> 8) & 0x3f); input_report_abs(dev, ABS_RX, (data[1] >> 2) & 0x3f); input_report_abs(dev, ABS_RY, (data[1] >> 8) & 0x3f); input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f); input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1)); input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1)); for (j = 0; j < 9; j++) input_report_key(dev, grip_btn_dc[j], (data[3] >> (j + 3)) & 1); break; } input_sync(dev); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)89697.60%342.86%
Dmitry Torokhov171.85%342.86%
Vojtech Pavlik50.54%114.29%
Total918100.00%7100.00%


static int grip_open(struct input_dev *dev) { struct grip *grip = input_get_drvdata(dev); gameport_start_polling(grip->gameport); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2683.87%250.00%
Dmitry Torokhov516.13%250.00%
Total31100.00%4100.00%


static void grip_close(struct input_dev *dev) { struct grip *grip = input_get_drvdata(dev); gameport_stop_polling(grip->gameport); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2382.14%250.00%
Dmitry Torokhov517.86%250.00%
Total28100.00%4100.00%


static int grip_connect(struct gameport *gameport, struct gameport_driver *drv) { struct grip *grip; struct input_dev *input_dev; unsigned int data[GRIP_LENGTH_XT]; int i, j, t; int err; if (!(grip = kzalloc(sizeof(struct grip), GFP_KERNEL))) return -ENOMEM; grip->gameport = gameport; gameport_set_drvdata(gameport, grip); err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW); if (err) goto fail1; for (i = 0; i < 2; i++) { if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) { grip->mode[i] = GRIP_MODE_GPP; continue; } if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) { if (!(data[3] & 7)) { grip->mode[i] = GRIP_MODE_BD; continue; } if (!(data[2] & 0xf0)) { grip->mode[i] = GRIP_MODE_XT; continue; } grip->mode[i] = GRIP_MODE_DC; continue; } } if (!grip->mode[0] && !grip->mode[1]) { err = -ENODEV; goto fail2; } gameport_set_poll_handler(gameport, grip_poll); gameport_set_poll_interval(gameport, 20); for (i = 0; i < 2; i++) { if (!grip->mode[i]) continue; grip->dev[i] = input_dev = input_allocate_device(); if (!input_dev) { err = -ENOMEM; goto fail3; } snprintf(grip->phys[i], sizeof(grip->phys[i]), "%s/input%d", gameport->phys, i); input_dev->name = grip_name[grip->mode[i]]; input_dev->phys = grip->phys[i]; input_dev->id.bustype = BUS_GAMEPORT; input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS; input_dev->id.product = grip->mode[i]; input_dev->id.version = 0x0100; input_dev->dev.parent = &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[grip->mode[i]][j]) >= 0; j++) { if (j < grip_cen[grip->mode[i]]) input_set_abs_params(input_dev, t, 14, 52, 1, 2); else if (j < grip_anx[grip->mode[i]]) input_set_abs_params(input_dev, t, 3, 57, 1, 0); else input_set_abs_params(input_dev, t, -1, 1, 0, 0); } for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++) if (t > 0) set_bit(t, input_dev->keybit); err = input_register_device(grip->dev[i]); if (err) goto fail4; } return 0; fail4: input_free_device(grip->dev[i]); fail3: while (--i >= 0) if (grip->dev[i]) input_unregister_device(grip->dev[i]); fail2: gameport_close(gameport); fail1: gameport_set_drvdata(gameport, NULL); kfree(grip); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)42061.22%318.75%
Dmitry Torokhov22432.65%956.25%
Vojtech Pavlik395.69%212.50%
Jiri Slaby20.29%16.25%
Pekka J Enberg10.15%16.25%
Total686100.00%16100.00%


static void grip_disconnect(struct gameport *gameport) { struct grip *grip = gameport_get_drvdata(gameport); int i; for (i = 0; i < 2; i++) if (grip->dev[i]) input_unregister_device(grip->dev[i]); gameport_close(gameport); gameport_set_drvdata(gameport, NULL); kfree(grip); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5778.08%240.00%
Dmitry Torokhov1621.92%360.00%
Total73100.00%5100.00%

static struct gameport_driver grip_drv = { .driver = { .name = "grip", .owner = THIS_MODULE, }, .description = DRIVER_DESC, .connect = grip_connect, .disconnect = grip_disconnect, }; module_gameport_driver(grip_drv);

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)235586.01%414.81%
Dmitry Torokhov29510.77%1037.04%
Vojtech Pavlik722.63%414.81%
Ingo Molnar40.15%27.41%
Tim Schmielau30.11%13.70%
Al Viro20.07%13.70%
Axel Lin20.07%13.70%
Jiri Slaby20.07%13.70%
Linus Torvalds10.04%13.70%
Pekka J Enberg10.04%13.70%
Adrian Bunk10.04%13.70%
Total2738100.00%27100.00%
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