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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simple-mfd-i2c.c (2655B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Simple MFD - I2C
      4 *
      5 * Author(s):
      6 * 	Michael Walle <michael@walle.cc>
      7 * 	Lee Jones <lee.jones@linaro.org>
      8 *
      9 * This driver creates a single register map with the intention for it to be
     10 * shared by all sub-devices.  Children can use their parent's device structure
     11 * (dev.parent) in order to reference it.
     12 *
     13 * Once the register map has been successfully initialised, any sub-devices
     14 * represented by child nodes in Device Tree or via the MFD cells in this file
     15 * will be subsequently registered.
     16 */
     17
     18#include <linux/i2c.h>
     19#include <linux/kernel.h>
     20#include <linux/mfd/core.h>
     21#include <linux/module.h>
     22#include <linux/of_platform.h>
     23#include <linux/regmap.h>
     24
     25#include "simple-mfd-i2c.h"
     26
     27static const struct regmap_config regmap_config_8r_8v = {
     28	.reg_bits = 8,
     29	.val_bits = 8,
     30};
     31
     32static int simple_mfd_i2c_probe(struct i2c_client *i2c)
     33{
     34	const struct simple_mfd_data *simple_mfd_data;
     35	const struct regmap_config *regmap_config;
     36	struct regmap *regmap;
     37	int ret;
     38
     39	simple_mfd_data = device_get_match_data(&i2c->dev);
     40
     41	/* If no regmap_config is specified, use the default 8reg and 8val bits */
     42	if (!simple_mfd_data || !simple_mfd_data->regmap_config)
     43		regmap_config = &regmap_config_8r_8v;
     44	else
     45		regmap_config = simple_mfd_data->regmap_config;
     46
     47	regmap = devm_regmap_init_i2c(i2c, regmap_config);
     48	if (IS_ERR(regmap))
     49		return PTR_ERR(regmap);
     50
     51	/* If no MFD cells are spedified, use register the DT child nodes instead */
     52	if (!simple_mfd_data || !simple_mfd_data->mfd_cell)
     53		return devm_of_platform_populate(&i2c->dev);
     54
     55	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
     56				   simple_mfd_data->mfd_cell,
     57				   simple_mfd_data->mfd_cell_size,
     58				   NULL, 0, NULL);
     59	if (ret)
     60		dev_err(&i2c->dev, "Failed to add child devices\n");
     61
     62	return ret;
     63}
     64
     65static const struct mfd_cell sy7636a_cells[] = {
     66	{ .name = "sy7636a-regulator", },
     67	{ .name = "sy7636a-temperature", },
     68};
     69
     70static const struct simple_mfd_data silergy_sy7636a = {
     71	.mfd_cell = sy7636a_cells,
     72	.mfd_cell_size = ARRAY_SIZE(sy7636a_cells),
     73};
     74
     75static const struct of_device_id simple_mfd_i2c_of_match[] = {
     76	{ .compatible = "kontron,sl28cpld" },
     77	{ .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
     78	{}
     79};
     80MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
     81
     82static struct i2c_driver simple_mfd_i2c_driver = {
     83	.probe_new = simple_mfd_i2c_probe,
     84	.driver = {
     85		.name = "simple-mfd-i2c",
     86		.of_match_table = simple_mfd_i2c_of_match,
     87	},
     88};
     89module_i2c_driver(simple_mfd_i2c_driver);
     90
     91MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
     92MODULE_DESCRIPTION("Simple MFD - I2C driver");
     93MODULE_LICENSE("GPL v2");