path: root/sound/pci/ice1712/delta.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   ALSA driver for ICEnsemble ICE1712 (Envy24)
 *
 *   Lowlevel functions for M-Audio Delta 1010, 1010E, 44, 66, 66E, Dio2496,
 *			    Audiophile, Digigram VX442
 *
 *	Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
 */      

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mutex.h>

#include <sound/core.h>
#include <sound/cs8427.h>
#include <sound/asoundef.h>

#include "ice1712.h"
#include "delta.h"

#define SND_CS8403
#include <sound/cs8403.h>


/*
 * CS8427 via SPI mode (for Audiophile), emulated I2C
 */

/* send 8 bits */
static void ap_cs8427_write_byte(struct snd_ice1712 *ice, unsigned char data, unsigned char tmp)
{
	int idx;

	for (idx = 7; idx >= 0; idx--) {
		tmp &= ~(ICE1712_DELTA_AP_DOUT|ICE1712_DELTA_AP_CCLK);
		if (data & (1 << idx))
			tmp |= ICE1712_DELTA_AP_DOUT;
		snd_ice1712_write(ice, ICE1712_IREG_GPIO_DATA, tmp);
		udelay(5);
		tmp |= ICE1712_DELTA_AP_CCLK;
		snd_ice1712_write(ice, ICE1712_IREG_GPIO_DATA, tmp);
		udelay(5);
	}
}

/* read 8 bits */
static unsigned char ap_cs8427_read_byte(struct snd_ice1712 *ice, unsigned char tmp)
{
	unsigned char data = 0;
	int idx;
	
	for (idx = 7; idx >= 0; idx--) {
		tmp &= ~ICE1712_DELTA_AP_CCLK;
		snd_ice1712_write(ice, ICE1712_IREG_GPIO_DATA, tmp);
		udelay(5);
		if (snd_ice1712_read(ice, ICE1712_IREG_GPIO_DATA) & ICE1712_DELTA_AP_DIN)
			data |= 1 << idx;
		tmp |= ICE1712_DELTA_AP_CCLK;
		snd_ice1712_write(ice, ICE1712_IREG_GPIO_DATA, tmp);
		udelay(5);
	}
	return data;
}

/* assert chip select */
static unsigned char ap_cs8427_codec_select(struct snd_ice1712 *ice)
{
	unsigned char tmp;
	tmp = snd_ice1712_read(ice, ICE1712_IREG_GPIO_DATA);
	switch (ice->eeprom.subvendor) {
	case ICE1712_SUBDEVICE_DELTA1010E:
	case ICE1712_SUBDEVICE_DELTA1010LT:
		tmp &= ~ICE1712_DELTA_1010LT_CS;
		tmp |= ICE1712_DELTA_1010LT_CCLK | ICE1712_DELTA_1010LT_CS_CS8427;
		break;
	case ICE1712_SUBDEVICE_AUDIOPHILE:
	case ICE1712_SUBDEVICE_DELTA410:
		tmp |= ICE1712_DELTA_AP_CCLK | ICE1712_DELTA_AP_CS_CODEC;
		tmp &= ~ICE1712_DELTA_AP_CS_DIGITAL;
		break;
	case ICE1712_SUBDEVICE_DELTA66E:
		tmp |= ICE1712_DELTA_66E_CCLK | ICE1712_DELTA_66E_CS_CHIP_A |
		       ICE1712_DELTA_66E_CS_CHIP_B;
		tmp &= ~ICE1712_DELTA_66E_CS_CS8427;
		break;
	case ICE1712_SUBDEVICE_VX442:
		tmp |= ICE1712_VX442_CCLK | ICE1712_VX442_CODEC_CHIP_A | ICE1712_VX442_CODEC_CHIP_B;
		tmp &= ~ICE1712_VX442_CS_DIGITAL;
		break;
	}
	snd_ice1712_write(ice, ICE1712_IREG_GPIO_DATA, tmp);
	udelay(5);
	return tmp;
}

/* deassert chip select */
static void ap_cs8427_codec_deassert(struct snd_ice1712 *ice, unsigned char tmp)
{
	switch (ice->eeprom.subvendor) {
	case ICE1712_SUBDEVICE_DELTA1010E:
	case ICE1712_SUBDEVICE_DELTA1010LT:
		tmp &= ~ICE1712_DELTA_1010LT_CS;
		tmp |= ICE1712_DELTA_1010LT_CS_NONE;
		break;
	case ICE1712_SUBDEVICE_AUDIOPHILE:
	case ICE1712_SUBDEVICE_DELTA410:
		tmp |= ICE1712_DELTA_AP_CS_DIGITAL;
		break;
	case ICE1712_SUBDEVICE_DELTA66E:
		tmp |= ICE1712_DELTA_66E_CS_CS8427;
		break;
	case ICE1712_SUBDEVICE_VX442:
		tmp |= ICE1712_VX442_CS_DIGITAL;
		break;
	}
	snd_ice1712_write(ice, ICE1712_IREG_GPIO_DATA, tmp);
}

/* sequential write */
static int ap_cs8427_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count)
{
	struct snd_ice1712 *ice = device->bus->private_data;
	int res = count;
	unsigned char tmp;

	guard(mutex)(&ice->gpio_mutex);
	tmp = ap_cs8427_codec_select(ice);
	ap_cs8427_write_byte(ice, (device->addr << 1) | 0, tmp); /* address + write mode */
	while (count-- > 0)
		ap_cs8427_write_byte(ice, *bytes++, tmp);
	ap_cs8427_codec_deassert(ice, tmp);
	return res;
}

/* sequential read */
static int ap_cs8427_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count)
{
	struct snd_ice1712 *ice = device->bus->private_data;
	int res = count;
	unsigned char tmp;
	
	guard(mutex)(&ice->gpio_mutex);
	tmp = ap_cs8427_codec_select(ice);
	ap_cs8427_write_byte(ice, (device->addr << 1) | 1, tmp); /* address + read mode */
	while (count-- > 0)
		*bytes++ = ap_cs8427_read_byte