cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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madera-i2c.c (3687B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * I2C bus interface to Cirrus Logic Madera codecs
      4 *
      5 * Copyright (C) 2015-2018 Cirrus Logic
      6 */
      7
      8#include <linux/device.h>
      9#include <linux/err.h>
     10#include <linux/i2c.h>
     11#include <linux/module.h>
     12#include <linux/of.h>
     13#include <linux/of_device.h>
     14#include <linux/regmap.h>
     15
     16#include <linux/mfd/madera/core.h>
     17
     18#include "madera.h"
     19
     20static int madera_i2c_probe(struct i2c_client *i2c,
     21			    const struct i2c_device_id *id)
     22{
     23	struct madera *madera;
     24	const struct regmap_config *regmap_16bit_config = NULL;
     25	const struct regmap_config *regmap_32bit_config = NULL;
     26	const void *of_data;
     27	unsigned long type;
     28	const char *name;
     29	int ret;
     30
     31	of_data = of_device_get_match_data(&i2c->dev);
     32	if (of_data)
     33		type = (unsigned long)of_data;
     34	else
     35		type = id->driver_data;
     36
     37	switch (type) {
     38	case CS47L15:
     39		if (IS_ENABLED(CONFIG_MFD_CS47L15)) {
     40			regmap_16bit_config = &cs47l15_16bit_i2c_regmap;
     41			regmap_32bit_config = &cs47l15_32bit_i2c_regmap;
     42		}
     43		break;
     44	case CS47L35:
     45		if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
     46			regmap_16bit_config = &cs47l35_16bit_i2c_regmap;
     47			regmap_32bit_config = &cs47l35_32bit_i2c_regmap;
     48		}
     49		break;
     50	case CS47L85:
     51	case WM1840:
     52		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
     53			regmap_16bit_config = &cs47l85_16bit_i2c_regmap;
     54			regmap_32bit_config = &cs47l85_32bit_i2c_regmap;
     55		}
     56		break;
     57	case CS47L90:
     58	case CS47L91:
     59		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
     60			regmap_16bit_config = &cs47l90_16bit_i2c_regmap;
     61			regmap_32bit_config = &cs47l90_32bit_i2c_regmap;
     62		}
     63		break;
     64	case CS42L92:
     65	case CS47L92:
     66	case CS47L93:
     67		if (IS_ENABLED(CONFIG_MFD_CS47L92)) {
     68			regmap_16bit_config = &cs47l92_16bit_i2c_regmap;
     69			regmap_32bit_config = &cs47l92_32bit_i2c_regmap;
     70		}
     71		break;
     72	default:
     73		dev_err(&i2c->dev,
     74			"Unknown Madera I2C device type %ld\n", type);
     75		return -EINVAL;
     76	}
     77
     78	name = madera_name_from_type(type);
     79
     80	if (!regmap_16bit_config) {
     81		/* it's polite to say which codec isn't built into the kernel */
     82		dev_err(&i2c->dev,
     83			"Kernel does not include support for %s\n", name);
     84		return -EINVAL;
     85	}
     86
     87	madera = devm_kzalloc(&i2c->dev, sizeof(*madera), GFP_KERNEL);
     88	if (!madera)
     89		return -ENOMEM;
     90
     91	madera->regmap = devm_regmap_init_i2c(i2c, regmap_16bit_config);
     92	if (IS_ERR(madera->regmap)) {
     93		ret = PTR_ERR(madera->regmap);
     94		dev_err(&i2c->dev,
     95			"Failed to allocate 16-bit register map: %d\n",	ret);
     96		return ret;
     97	}
     98
     99	madera->regmap_32bit = devm_regmap_init_i2c(i2c, regmap_32bit_config);
    100	if (IS_ERR(madera->regmap_32bit)) {
    101		ret = PTR_ERR(madera->regmap_32bit);
    102		dev_err(&i2c->dev,
    103			"Failed to allocate 32-bit register map: %d\n", ret);
    104		return ret;
    105	}
    106
    107	madera->type = type;
    108	madera->type_name = name;
    109	madera->dev = &i2c->dev;
    110	madera->irq = i2c->irq;
    111
    112	return madera_dev_init(madera);
    113}
    114
    115static int madera_i2c_remove(struct i2c_client *i2c)
    116{
    117	struct madera *madera = dev_get_drvdata(&i2c->dev);
    118
    119	madera_dev_exit(madera);
    120
    121	return 0;
    122}
    123
    124static const struct i2c_device_id madera_i2c_id[] = {
    125	{ "cs47l15", CS47L15 },
    126	{ "cs47l35", CS47L35 },
    127	{ "cs47l85", CS47L85 },
    128	{ "cs47l90", CS47L90 },
    129	{ "cs47l91", CS47L91 },
    130	{ "cs42l92", CS42L92 },
    131	{ "cs47l92", CS47L92 },
    132	{ "cs47l93", CS47L93 },
    133	{ "wm1840", WM1840 },
    134	{ }
    135};
    136MODULE_DEVICE_TABLE(i2c, madera_i2c_id);
    137
    138static struct i2c_driver madera_i2c_driver = {
    139	.driver = {
    140		.name	= "madera",
    141		.pm	= &madera_pm_ops,
    142		.of_match_table	= of_match_ptr(madera_of_match),
    143	},
    144	.probe		= madera_i2c_probe,
    145	.remove		= madera_i2c_remove,
    146	.id_table	= madera_i2c_id,
    147};
    148
    149module_i2c_driver(madera_i2c_driver);
    150
    151MODULE_DESCRIPTION("Madera I2C bus interface");
    152MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
    153MODULE_LICENSE("GPL v2");