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

lp87565.c (3333B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
      4 *
      5 * Author: Keerthy <j-keerthy@ti.com>
      6 */
      7
      8#include <linux/gpio/consumer.h>
      9#include <linux/interrupt.h>
     10#include <linux/mfd/core.h>
     11#include <linux/module.h>
     12#include <linux/of_device.h>
     13#include <linux/regmap.h>
     14
     15#include <linux/mfd/lp87565.h>
     16
     17static const struct regmap_config lp87565_regmap_config = {
     18	.reg_bits = 8,
     19	.val_bits = 8,
     20	.max_register = LP87565_REG_MAX,
     21};
     22
     23static const struct mfd_cell lp87565_cells[] = {
     24	{ .name = "lp87565-q1-regulator", },
     25	{ .name = "lp87565-q1-gpio", },
     26};
     27
     28static const struct of_device_id of_lp87565_match_table[] = {
     29	{ .compatible = "ti,lp87565", },
     30	{
     31		.compatible = "ti,lp87524-q1",
     32		.data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
     33	},
     34	{
     35		.compatible = "ti,lp87565-q1",
     36		.data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
     37	},
     38	{
     39		.compatible = "ti,lp87561-q1",
     40		.data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
     41	},
     42	{}
     43};
     44MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
     45
     46static int lp87565_probe(struct i2c_client *client,
     47			 const struct i2c_device_id *ids)
     48{
     49	struct lp87565 *lp87565;
     50	const struct of_device_id *of_id;
     51	int ret;
     52	unsigned int otpid;
     53
     54	lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
     55	if (!lp87565)
     56		return -ENOMEM;
     57
     58	lp87565->dev = &client->dev;
     59
     60	lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
     61	if (IS_ERR(lp87565->regmap)) {
     62		ret = PTR_ERR(lp87565->regmap);
     63		dev_err(lp87565->dev,
     64			"Failed to initialize register map: %d\n", ret);
     65		return ret;
     66	}
     67
     68	lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
     69						      GPIOD_OUT_LOW);
     70	if (IS_ERR(lp87565->reset_gpio)) {
     71		ret = PTR_ERR(lp87565->reset_gpio);
     72		if (ret == -EPROBE_DEFER)
     73			return ret;
     74	}
     75
     76	if (lp87565->reset_gpio) {
     77		gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
     78		/* The minimum assertion time is undocumented, just guess */
     79		usleep_range(2000, 4000);
     80
     81		gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
     82		/* Min 1.2 ms before first I2C transaction */
     83		usleep_range(1500, 3000);
     84	}
     85
     86	ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
     87	if (ret) {
     88		dev_err(lp87565->dev, "Failed to read OTP ID\n");
     89		return ret;
     90	}
     91
     92	lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
     93
     94	of_id = of_match_device(of_lp87565_match_table, &client->dev);
     95	if (of_id)
     96		lp87565->dev_type = (enum lp87565_device_type)of_id->data;
     97
     98	i2c_set_clientdata(client, lp87565);
     99
    100	return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
    101				    lp87565_cells, ARRAY_SIZE(lp87565_cells),
    102				    NULL, 0, NULL);
    103}
    104
    105static void lp87565_shutdown(struct i2c_client *client)
    106{
    107	struct lp87565 *lp87565 = i2c_get_clientdata(client);
    108
    109	gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
    110}
    111
    112static const struct i2c_device_id lp87565_id_table[] = {
    113	{ "lp87565-q1", 0 },
    114	{ },
    115};
    116MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
    117
    118static struct i2c_driver lp87565_driver = {
    119	.driver	= {
    120		.name	= "lp87565",
    121		.of_match_table = of_lp87565_match_table,
    122	},
    123	.probe = lp87565_probe,
    124	.shutdown = lp87565_shutdown,
    125	.id_table = lp87565_id_table,
    126};
    127module_i2c_driver(lp87565_driver);
    128
    129MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
    130MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
    131MODULE_LICENSE("GPL v2");