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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lp873x.c (2512B)

      1/*
      2 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
      3 *
      4 * Author: Keerthy <j-keerthy@ti.com>
      5 *
      6 * This program is free software; you can redistribute it and/or
      7 * modify it under the terms of the GNU General Public License as
      8 * published by the Free Software Foundation version 2.
      9 *
     10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
     11 * kind, whether express or implied; without even the implied warranty
     12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13 * GNU General Public License for more details.
     14 */
     15
     16#include <linux/interrupt.h>
     17#include <linux/mfd/core.h>
     18#include <linux/module.h>
     19#include <linux/of_device.h>
     20#include <linux/regmap.h>
     21
     22#include <linux/mfd/lp873x.h>
     23
     24static const struct regmap_config lp873x_regmap_config = {
     25	.reg_bits = 8,
     26	.val_bits = 8,
     27	.max_register = LP873X_REG_MAX,
     28};
     29
     30static const struct mfd_cell lp873x_cells[] = {
     31	{ .name = "lp873x-regulator", },
     32	{ .name = "lp873x-gpio", },
     33};
     34
     35static int lp873x_probe(struct i2c_client *client,
     36			const struct i2c_device_id *ids)
     37{
     38	struct lp873x *lp873;
     39	int ret;
     40	unsigned int otpid;
     41
     42	lp873 = devm_kzalloc(&client->dev, sizeof(*lp873), GFP_KERNEL);
     43	if (!lp873)
     44		return -ENOMEM;
     45
     46	lp873->dev = &client->dev;
     47
     48	lp873->regmap = devm_regmap_init_i2c(client, &lp873x_regmap_config);
     49	if (IS_ERR(lp873->regmap)) {
     50		ret = PTR_ERR(lp873->regmap);
     51		dev_err(lp873->dev,
     52			"Failed to initialize register map: %d\n", ret);
     53		return ret;
     54	}
     55
     56	ret = regmap_read(lp873->regmap, LP873X_REG_OTP_REV, &otpid);
     57	if (ret) {
     58		dev_err(lp873->dev, "Failed to read OTP ID\n");
     59		return ret;
     60	}
     61
     62	lp873->rev = otpid & LP873X_OTP_REV_OTP_ID;
     63
     64	i2c_set_clientdata(client, lp873);
     65
     66	ret = mfd_add_devices(lp873->dev, PLATFORM_DEVID_AUTO, lp873x_cells,
     67			      ARRAY_SIZE(lp873x_cells), NULL, 0, NULL);
     68
     69	return ret;
     70}
     71
     72static const struct of_device_id of_lp873x_match_table[] = {
     73	{ .compatible = "ti,lp8733", },
     74	{ .compatible = "ti,lp8732", },
     75	{}
     76};
     77MODULE_DEVICE_TABLE(of, of_lp873x_match_table);
     78
     79static const struct i2c_device_id lp873x_id_table[] = {
     80	{ "lp873x", 0 },
     81	{ },
     82};
     83MODULE_DEVICE_TABLE(i2c, lp873x_id_table);
     84
     85static struct i2c_driver lp873x_driver = {
     86	.driver	= {
     87		.name	= "lp873x",
     88		.of_match_table = of_lp873x_match_table,
     89	},
     90	.probe		= lp873x_probe,
     91	.id_table	= lp873x_id_table,
     92};
     93module_i2c_driver(lp873x_driver);
     94
     95MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
     96MODULE_DESCRIPTION("LP873X chip family Multi-Function Device driver");
     97MODULE_LICENSE("GPL v2");