cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ak4xxx.c (4151B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *   ALSA driver for ICEnsemble ICE1712 (Envy24)
      4 *
      5 *   AK4524 / AK4528 / AK4529 / AK4355 / AK4381 interface
      6 *
      7 *	Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
      8 */      
      9
     10#include <linux/io.h>
     11#include <linux/delay.h>
     12#include <linux/interrupt.h>
     13#include <linux/slab.h>
     14#include <linux/init.h>
     15#include <linux/module.h>
     16#include <sound/core.h>
     17#include <sound/initval.h>
     18#include "ice1712.h"
     19
     20MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
     21MODULE_DESCRIPTION("ICEnsemble ICE17xx <-> AK4xxx AD/DA chip interface");
     22MODULE_LICENSE("GPL");
     23
     24static void snd_ice1712_akm4xxx_lock(struct snd_akm4xxx *ak, int chip)
     25{
     26	struct snd_ice1712 *ice = ak->private_data[0];
     27
     28	snd_ice1712_save_gpio_status(ice);
     29}
     30
     31static void snd_ice1712_akm4xxx_unlock(struct snd_akm4xxx *ak, int chip)
     32{
     33	struct snd_ice1712 *ice = ak->private_data[0];
     34
     35	snd_ice1712_restore_gpio_status(ice);
     36}
     37
     38/*
     39 * write AK4xxx register
     40 */
     41static void snd_ice1712_akm4xxx_write(struct snd_akm4xxx *ak, int chip,
     42				      unsigned char addr, unsigned char data)
     43{
     44	unsigned int tmp;
     45	int idx;
     46	unsigned int addrdata;
     47	struct snd_ak4xxx_private *priv = (void *)ak->private_value[0];
     48	struct snd_ice1712 *ice = ak->private_data[0];
     49
     50	if (snd_BUG_ON(chip < 0 || chip >= 4))
     51		return;
     52
     53	tmp = snd_ice1712_gpio_read(ice);
     54	tmp |= priv->add_flags;
     55	tmp &= ~priv->mask_flags;
     56	if (priv->cs_mask == priv->cs_addr) {
     57		if (priv->cif) {
     58			tmp |= priv->cs_mask; /* start without chip select */
     59		}  else {
     60			tmp &= ~priv->cs_mask; /* chip select low */
     61			snd_ice1712_gpio_write(ice, tmp);
     62			udelay(1);
     63		}
     64	} else {
     65		/* doesn't handle cf=1 yet */
     66		tmp &= ~priv->cs_mask;
     67		tmp |= priv->cs_addr;
     68		snd_ice1712_gpio_write(ice, tmp);
     69		udelay(1);
     70	}
     71
     72	/* build I2C address + data byte */
     73	addrdata = (priv->caddr << 6) | 0x20 | (addr & 0x1f);
     74	addrdata = (addrdata << 8) | data;
     75	for (idx = 15; idx >= 0; idx--) {
     76		/* drop clock */
     77		tmp &= ~priv->clk_mask;
     78		snd_ice1712_gpio_write(ice, tmp);
     79		udelay(1);
     80		/* set data */
     81		if (addrdata & (1 << idx))
     82			tmp |= priv->data_mask;
     83		else
     84			tmp &= ~priv->data_mask;
     85		snd_ice1712_gpio_write(ice, tmp);
     86		udelay(1);
     87		/* raise clock */
     88		tmp |= priv->clk_mask;
     89		snd_ice1712_gpio_write(ice, tmp);
     90		udelay(1);
     91	}
     92
     93	if (priv->cs_mask == priv->cs_addr) {
     94		if (priv->cif) {
     95			/* assert a cs pulse to trigger */
     96			tmp &= ~priv->cs_mask;
     97			snd_ice1712_gpio_write(ice, tmp);
     98			udelay(1);
     99		}
    100		tmp |= priv->cs_mask; /* chip select high to trigger */
    101	} else {
    102		tmp &= ~priv->cs_mask;
    103		tmp |= priv->cs_none; /* deselect address */
    104	}
    105	snd_ice1712_gpio_write(ice, tmp);
    106	udelay(1);
    107}
    108
    109/*
    110 * initialize the struct snd_akm4xxx record with the template
    111 */
    112int snd_ice1712_akm4xxx_init(struct snd_akm4xxx *ak, const struct snd_akm4xxx *temp,
    113			     const struct snd_ak4xxx_private *_priv, struct snd_ice1712 *ice)
    114{
    115	struct snd_ak4xxx_private *priv;
    116
    117	if (_priv != NULL) {
    118		priv = kmalloc(sizeof(*priv), GFP_KERNEL);
    119		if (priv == NULL)
    120			return -ENOMEM;
    121		*priv = *_priv;
    122	} else {
    123		priv = NULL;
    124	}
    125	*ak = *temp;
    126	ak->card = ice->card;
    127        ak->private_value[0] = (unsigned long)priv;
    128	ak->private_data[0] = ice;
    129	if (ak->ops.lock == NULL)
    130		ak->ops.lock = snd_ice1712_akm4xxx_lock;
    131	if (ak->ops.unlock == NULL)
    132		ak->ops.unlock = snd_ice1712_akm4xxx_unlock;
    133	if (ak->ops.write == NULL)
    134		ak->ops.write = snd_ice1712_akm4xxx_write;
    135	snd_akm4xxx_init(ak);
    136	return 0;
    137}
    138
    139void snd_ice1712_akm4xxx_free(struct snd_ice1712 *ice)
    140{
    141	unsigned int akidx;
    142	if (ice->akm == NULL)
    143		return;
    144	for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
    145		struct snd_akm4xxx *ak = &ice->akm[akidx];
    146		kfree((void*)ak->private_value[0]);
    147	}
    148	kfree(ice->akm);
    149}
    150
    151/*
    152 * build AK4xxx controls
    153 */
    154int snd_ice1712_akm4xxx_build_controls(struct snd_ice1712 *ice)
    155{
    156	unsigned int akidx;
    157	int err;
    158
    159	for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
    160		struct snd_akm4xxx *ak = &ice->akm[akidx];
    161		err = snd_akm4xxx_build_controls(ak);
    162		if (err < 0)
    163			return err;
    164	}
    165	return 0;
    166}
    167
    168EXPORT_SYMBOL(snd_ice1712_akm4xxx_init);
    169EXPORT_SYMBOL(snd_ice1712_akm4xxx_free);
    170EXPORT_SYMBOL(snd_ice1712_akm4xxx_build_controls);