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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/pci/au88x0/au88x0_game.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 *  Manuel Jander.

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 *

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 *  Based on the work of:

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 *  Vojtech Pavlik

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 *  Raymond Ingles

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 *

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 * Should you need to contact me, the author, you can do so either by

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 * e-mail - mail your message to <[email protected]>, or by paper mail:

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 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic

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 *

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 * Based 90% on Vojtech Pavlik pcigame driver.

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 * Merged and modified by Manuel Jander, for the OpenVortex

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 * driver. (email: [email protected]).

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 */

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#include <linux/time.h>

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#include <linux/delay.h>

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#include <linux/init.h>

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#include <sound/core.h>

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#include "au88x0.h"

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#include <linux/gameport.h>

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#include <linux/export.h>

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#if IS_REACHABLE(CONFIG_GAMEPORT)

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#define VORTEX_GAME_DWAIT	20	/* 20 ms */

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static unsigned char vortex_game_read(struct gameport *gameport)

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{

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	vortex_t *vortex = gameport_get_port_data(gameport);

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	return hwread(vortex->mmio, VORTEX_GAME_LEGACY);

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}

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static void vortex_game_trigger(struct gameport *gameport)

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{

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	vortex_t *vortex = gameport_get_port_data(gameport);

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	hwwrite(vortex->mmio, VORTEX_GAME_LEGACY, 0xff);

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}

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static int

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vortex_game_cooked_read(struct gameport *gameport, int *axes, int *buttons)

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{

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	vortex_t *vortex = gameport_get_port_data(gameport);

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	int i;

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	*buttons = (~hwread(vortex->mmio, VORTEX_GAME_LEGACY) >> 4) & 0xf;

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	for (i = 0; i < 4; i++) {

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		axes[i] =

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		    hwread(vortex->mmio, VORTEX_GAME_AXIS + (i * AXIS_SIZE));

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		if (axes[i] == AXIS_RANGE)

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			axes[i] = -1;

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	}

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	return 0;

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}

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static int vortex_game_open(struct gameport *gameport, int mode)

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{

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	vortex_t *vortex = gameport_get_port_data(gameport);

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	switch (mode) {

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	case GAMEPORT_MODE_COOKED:

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		hwwrite(vortex->mmio, VORTEX_CTRL2,

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			hwread(vortex->mmio,

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			       VORTEX_CTRL2) | CTRL2_GAME_ADCMODE);

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		msleep(VORTEX_GAME_DWAIT);

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		return 0;

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	case GAMEPORT_MODE_RAW:

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		hwwrite(vortex->mmio, VORTEX_CTRL2,

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			hwread(vortex->mmio,

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			       VORTEX_CTRL2) & ~CTRL2_GAME_ADCMODE);

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		return 0;

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	default:

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		return -1;

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	}

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	return 0;

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}

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static int vortex_gameport_register(vortex_t *vortex)

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{

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	struct gameport *gp;

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	vortex->gameport = gp = gameport_allocate_port();

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	if (!gp) {

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		dev_err(vortex->card->dev,

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			"cannot allocate memory for gameport\n");

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		return -ENOMEM;

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	}

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	gameport_set_name(gp, "AU88x0 Gameport");

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	gameport_set_phys(gp, "pci%s/gameport0", pci_name(vortex->pci_dev));

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	gameport_set_dev_parent(gp, &vortex->pci_dev->dev);

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	gp->read = vortex_game_read;

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	gp->trigger = vortex_game_trigger;

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	gp->cooked_read = vortex_game_cooked_read;

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	gp->open = vortex_game_open;

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	gameport_set_port_data(gp, vortex);

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	gp->fuzz = 64;

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	gameport_register_port(gp);

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	return 0;

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}

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static void vortex_gameport_unregister(vortex_t * vortex)

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{

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	if (vortex->gameport) {

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		gameport_unregister_port(vortex->gameport);

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		vortex->gameport = NULL;

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	}

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}

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#else

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static inline int vortex_gameport_register(vortex_t * vortex) { return -ENOSYS; }

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static inline void vortex_gameport_unregister(vortex_t * vortex) { }

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#endif

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