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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wm831x-i2c.c (2705B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * wm831x-i2c.c  --  I2C access for Wolfson WM831x PMICs
      4 *
      5 * Copyright 2009,2010 Wolfson Microelectronics PLC.
      6 *
      7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/init.h>
     12#include <linux/i2c.h>
     13#include <linux/delay.h>
     14#include <linux/mfd/core.h>
     15#include <linux/slab.h>
     16#include <linux/err.h>
     17#include <linux/of.h>
     18#include <linux/of_device.h>
     19#include <linux/regmap.h>
     20
     21#include <linux/mfd/wm831x/core.h>
     22#include <linux/mfd/wm831x/pdata.h>
     23
     24static int wm831x_i2c_probe(struct i2c_client *i2c,
     25			    const struct i2c_device_id *id)
     26{
     27	struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
     28	const struct of_device_id *of_id;
     29	struct wm831x *wm831x;
     30	enum wm831x_parent type;
     31	int ret;
     32
     33	if (i2c->dev.of_node) {
     34		of_id = of_match_device(wm831x_of_match, &i2c->dev);
     35		if (!of_id) {
     36			dev_err(&i2c->dev, "Failed to match device\n");
     37			return -ENODEV;
     38		}
     39		type = (enum wm831x_parent)of_id->data;
     40	} else {
     41		type = (enum wm831x_parent)id->driver_data;
     42	}
     43
     44	wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
     45	if (wm831x == NULL)
     46		return -ENOMEM;
     47
     48	i2c_set_clientdata(i2c, wm831x);
     49	wm831x->dev = &i2c->dev;
     50	wm831x->type = type;
     51
     52	wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
     53	if (IS_ERR(wm831x->regmap)) {
     54		ret = PTR_ERR(wm831x->regmap);
     55		dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
     56			ret);
     57		return ret;
     58	}
     59
     60	if (pdata)
     61		memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
     62
     63	return wm831x_device_init(wm831x, i2c->irq);
     64}
     65
     66static int wm831x_i2c_suspend(struct device *dev)
     67{
     68	struct wm831x *wm831x = dev_get_drvdata(dev);
     69
     70	return wm831x_device_suspend(wm831x);
     71}
     72
     73static int wm831x_i2c_poweroff(struct device *dev)
     74{
     75	struct wm831x *wm831x = dev_get_drvdata(dev);
     76
     77	wm831x_device_shutdown(wm831x);
     78
     79	return 0;
     80}
     81
     82static const struct i2c_device_id wm831x_i2c_id[] = {
     83	{ "wm8310", WM8310 },
     84	{ "wm8311", WM8311 },
     85	{ "wm8312", WM8312 },
     86	{ "wm8320", WM8320 },
     87	{ "wm8321", WM8321 },
     88	{ "wm8325", WM8325 },
     89	{ "wm8326", WM8326 },
     90	{ }
     91};
     92
     93static const struct dev_pm_ops wm831x_pm_ops = {
     94	.suspend = wm831x_i2c_suspend,
     95	.poweroff = wm831x_i2c_poweroff,
     96};
     97
     98static struct i2c_driver wm831x_i2c_driver = {
     99	.driver = {
    100		.name = "wm831x",
    101		.pm = &wm831x_pm_ops,
    102		.of_match_table = of_match_ptr(wm831x_of_match),
    103		.suppress_bind_attrs = true,
    104	},
    105	.probe = wm831x_i2c_probe,
    106	.id_table = wm831x_i2c_id,
    107};
    108
    109static int __init wm831x_i2c_init(void)
    110{
    111	int ret;
    112
    113	ret = i2c_add_driver(&wm831x_i2c_driver);
    114	if (ret != 0)
    115		pr_err("Failed to register wm831x I2C driver: %d\n", ret);
    116
    117	return ret;
    118}
    119subsys_initcall(wm831x_i2c_init);