// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for Gravis UltraSound Extreme soundcards
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 */

#include <linux/init.h>
#include <linux/err.h>
#include <linux/isa.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/module.h>
#include <asm/dma.h>
#include <sound/core.h>
#include <sound/gus.h>
#include <sound/es1688.h>
#include <sound/mpu401.h>
#include <sound/opl3.h>
#define SNDRV_LEGACY_AUTO_PROBE
#define SNDRV_LEGACY_FIND_FREE_IRQ
#define SNDRV_LEGACY_FIND_FREE_DMA
#include <sound/initval.h>

#define CRD_NAME "Gravis UltraSound Extreme"
#define DEV_NAME "gusextreme"

MODULE_DESCRIPTION(CRD_NAME);
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_LICENSE("GPL");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;	/* Enable this card */
static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;	/* 0x220,0x240,0x260 */
static long gf1_port[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS) - 1] = -1}; /* 0x210,0x220,0x230,0x240,0x250,0x260,0x270 */
static long mpu_port[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS) - 1] = -1}; /* 0x300,0x310,0x320 */
static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* 5,7,9,10 */
static int mpu_irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* 5,7,9,10 */
static int gf1_irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* 2,3,5,9,11,12,15 */
static int dma8[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;	/* 0,1,3 */
static int dma1[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;
static int joystick_dac[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 29};
				/* 0 to 31, (0.59V-4.52V or 0.389V-2.98V) */
static int channels[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 24};
static int pcm_channels[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " CRD_NAME " soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for " CRD_NAME " soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable " CRD_NAME " soundcard.");
module_param_hw_array(port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(port, "Port # for " CRD_NAME " driver.");
module_param_hw_array(gf1_port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(gf1_port, "GF1 port # for " CRD_NAME " driver (optional).");
module_param_hw_array(mpu_port, long, ioport, NULL, 0444);
MODULE_PARM_DESC(mpu_port, "MPU-401 port # for " CRD_NAME " driver.");
module_param_hw_array(irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(irq, "IRQ # for " CRD_NAME " driver.");
module_param_hw_array(mpu_irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(mpu_irq, "MPU-401 IRQ # for " CRD_NAME " driver.");
module_param_hw_array(gf1_irq, int, irq, NULL, 0444);
MODULE_PARM_DESC(gf1_irq, "GF1 IRQ # for " CRD_NAME " driver.");
module_param_hw_array(dma8, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma8, "8-bit DMA # for " CRD_NAME " driver.");
module_param_hw_array(dma1, int, dma, NULL, 0444);
MODULE_PARM_DESC(dma1, "GF1 DMA # for " CRD_NAME " driver.");
module_param_array(joystick_dac, int, NULL, 0444);
MODULE_PARM_DESC(joystick_dac, "Joystick DAC level 0.59V-4.52V or 0.389V-2.98V for " CRD_NAME " driver.");
module_param_array(channels, int, NULL, 0444);
MODULE_PARM_DESC(channels, "GF1 channels for " CRD_NAME " driver.");
module_param_array(pcm_channels, int, NULL, 0444);
MODULE_PARM_DESC(pcm_channels, "Reserved PCM channels for " CRD_NAME " driver.");

static int snd_gusextreme_match(struct device *dev, unsigned int n)
{
	return enable[n];
}

static int snd_gusextreme_es1688_create(struct snd_card *card,
					struct snd_es1688 *chip,
					struct device *dev, unsigned int n)
{
	static const long possible_ports[] = {0x220, 0x240, 0x260};
	static const int possible_irqs[] = {5, 9, 10, 7, -1};
	static const int possible_dmas[] = {1, 3, 0, -1};

	int i, error;

	if (irq[n] == SNDRV_AUTO_IRQ) {
		irq[n] = snd_legacy_find_free_irq(possible_irqs);
		if (irq[n] < 0) {
			dev_err(dev, "unable to find a free IRQ for ES1688\n");
			return -EBUSY;
		}
	}
	if (dma8[n] == SNDRV_AUTO_DMA) {
		dma8[n] = snd_legacy_find_free_dma(possible_dmas);
		if (dma8[n] < 0) {
			dev_err(dev, "unable to find a free DMA for ES1688\n");
			return -EBUSY;
		}
	}

	if (port[n] != SNDRV_AUTO_PORT)
		return snd_es1688_create(card, chip, port[n], mpu_port[n],
				irq[n], mpu_irq[n], dma8[n], ES1688_HW_1688);

	i = 0;
	do {
		port[n] = possible_ports[i];
		error = snd_es1688_create(card, chip, port[n], mpu_port[n],
				irq[n], mpu_irq[n], dma8[n], ES1688_HW_1688);
	} while (error < 0 && ++i < ARRAY_SIZE(possible_ports));

	return error;
}

static int snd_gusextreme_gus_card_create(struct snd_card *card,
					  struct device *dev, unsigned int n,
					  struct snd_gus_card **rgus)
{
	static const int possible_irqs[] = {11, 12, 15, 9, 5, 7, 3, -1};
	static const int possible_dmas[] = {5, 6, 7, 3, 1, -1};

	if (gf1_irq[n] == SNDRV_AUTO_IRQ) {
		gf1_irq[n] = snd_legacy_find_free_irq(possible_irqs);
		if (gf1_irq[n] < 0) {
			dev_err(dev, "unable to find a free IRQ for GF1\n");
			return -EBUSY;
		}
	}
	if (dma1[n] == SNDRV_AUTO_DMA) {
		dma1[n] = snd_legacy_find_free_dma(possible_dmas);
		if (dma1[n] < 0) {
			dev_err(dev, "unable to find a free DMA for GF1\n");
			return -EBUSY;
		}
	}
	return snd_gus_create(card, gf1_port[n], gf1_irq[n], dma1[n], -1,
			0, channels[n], pcm_channels[n], 0, rgus);
}

static int snd_gusextreme_detect(struct snd_gus_card *gus,
				 struct snd_es1688 *es1688)
{
	unsigned char d;

	/*
	 * This is main stuff - enable access to GF1 chip...
	 * I'm not sure, if this will work for card which have
	 * ES1688 chip in another place than 0x220.
         *
         * I used reverse-engineering in DOSEMU. [--jk]
	 *
	 * ULTRINIT.EXE:
	 * 0x230 = 0,2,3
	 * 0x240 = 2,0,1
	 * 0x250 = 2,0,3
	 * 0x260 = 2,2,1
	 */

	scoped_guard(spinlock_irqsave, &es1688->mixer_lock) {
		snd_es1688_mixer_write(es1688, 0x40, 0x0b); /* don't change!!! */
	}

	scoped_guard(spinlock_irqsave, &es1688->reg_lock) {
		outb(gus->gf1.port & 0x040 ? 2 : 0, ES1688P(es1688, INIT1));
		outb(0, 0x201);
		outb(gus->gf1.port & 0x020 ? 2 : 0, ES1688P(es1688, INIT1));
		outb(0, 0x201);
		outb(gus->gf1.port & 0x010 ? 3 : 1, ES1688P(es1688, INIT1));
	}

	udelay(100);

	snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 0);	/* reset GF1 */
	d = snd_gf1_i_look8(gus, SNDRV_GF1_GB_RESET);
	if ((d & 0x07) != 0) {
		dev_dbg(gus->card->dev, "[0x%lx] check 1 failed - 0x%x\n", gus->gf1.port, d);
		return -EIO;
	}
	udelay(160);
	snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 1);	/* release reset */
	udelay(160);
	d = snd_gf1_i_look8(gus, SNDRV_GF1_GB_RESET);
	if ((d & 0x07) != 1) {
		dev_dbg(gus->card->dev, "[0x%lx] check 2 failed - 0x%x\n", gus->gf1.port, d);
		return -EIO;
	}

	return 0;
}

static int snd_gusextreme_mixer(struct snd_card *card)
{
	struct snd_ctl_elem_id id1, id2;
	int error;

	memset(&id1, 0, sizeof(id1));
	memset(&id2, 0, sizeof(id2));
	id1.iface = id2.iface = SNDRV_CTL_ELEM_IFACE_MIXER;

	/* reassign AUX to SYNTHESIZER */
	strscpy(id1.name, "Aux Playback Volume");
	strscpy(id2.name, "Synth Playback Volume");
	error = snd_ctl_rename_id(card, &id1, &id2);
	if (error < 0)
		return error;

	/* reassign Master Playback Switch to Synth Playback Switch */
	strscpy(id1.name, "Master Playback Switch");
	strscpy(id2.name, "Synth Playback Switch");
	error = snd_ctl_rename_id(card, &id1, &id2);
	if (error < 0)
		return error;

	return 0;
}

static int snd_gusextreme_probe(struct device *dev, unsigned int n)
{
	struct snd_card *card;
	struct snd_gus_card *gus;
	struct snd_es1688 *es1688;
	struct snd_opl3 *opl3;
	int error;

	error = snd_devm_card_new(dev, index[n], id[n], THIS_MODULE,
				  sizeof(struct snd_es1688), &card);
	if (error < 0)
		return error;

	es1688 = card->private_data;

	if (mpu_port[n] == SNDRV_AUTO_PORT)
		mpu_port[n] = 0;

	if (mpu_irq[n] > 15)
		mpu_irq[n] = -1;

	error = snd_gusextreme_es1688_create(card, es1688, dev, n);
	if (error < 0)
		return error;

	if (gf1_port[n] < 0)
		gf1_port[n] = es1688->port + 0x20;

	error = snd_gusextreme_gus_card_create(card, dev, n, &gus);
	if (error < 0)
		return error;

	error = snd_gusextreme_detect(gus, es1688);
	if (error < 0)
		return error;

	gus->joystick_dac = joystick_dac[n];

	error = snd_gus_initialize(gus);
	if (error < 0)
		return error;

	error = -ENODEV;
	if (!gus->ess_flag) {
		dev_err(dev, "GUS Extreme soundcard was not "
			"detected at 0x%lx\n", gus->gf1.port);
		return error;
	}
	gus->codec_flag = 1;

	error = snd_es1688_pcm(card, es1688, 0);
	if (error < 0)
		return error;

	error = snd_es1688_mixer(card, es1688);
	if (error < 0)
		return error;

	snd_component_add(card, "ES1688");

	if (pcm_channels[n] > 0) {
		error = snd_gf1_pcm_new(gus, 1, 1);
		if (error < 0)
			return error;
	}

	error = snd_gf1_new_mixer(gus);
	if (error < 0)
		return error;

	error = snd_gusextreme_mixer(card);
	if (error < 0)
		return error;

	if (snd_opl3_create(card, es1688->port, es1688->port + 2,
			OPL3_HW_OPL3, 0, &opl3) < 0)
		dev_warn(dev, "opl3 not detected at 0x%lx\n", es1688->port);
	else {
		error = snd_opl3_hwdep_new(opl3, 0, 2, NULL);
		if (error < 0)
			return error;
	}

	if (es1688->mpu_port >= 0x300) {
		error = snd_mpu401_uart_new(card, 0, MPU401_HW_ES1688,
				es1688->mpu_port, 0, mpu_irq[n], NULL);
		if (error < 0)
			return error;
	}

	sprintf(card->longname, "Gravis UltraSound Extreme at 0x%lx, "
		"irq %i&%i, dma %i&%i", es1688->port,
		gus->gf1.irq, es1688->irq, gus->gf1.dma1, es1688->dma8);

	error = snd_card_register(card);
	if (error < 0)
		return error;

	dev_set_drvdata(dev, card);
	return 0;
}

static struct isa_driver snd_gusextreme_driver = {
	.match		= snd_gusextreme_match,
	.probe		= snd_gusextreme_probe,
#if 0	/* FIXME */
	.suspend	= snd_gusextreme_suspend,
	.resume		= snd_gusextreme_resume,
#endif
	.driver		= {
		.name	= DEV_NAME
	}
};

module_isa_driver(snd_gusextreme_driver, SNDRV_CARDS);