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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ti-lmu.c (5752B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * TI LMU (Lighting Management Unit) Core Driver
      4 *
      5 * Copyright 2017 Texas Instruments
      6 *
      7 * Author: Milo Kim <milo.kim@ti.com>
      8 */
      9
     10#include <linux/delay.h>
     11#include <linux/err.h>
     12#include <linux/gpio/consumer.h>
     13#include <linux/i2c.h>
     14#include <linux/kernel.h>
     15#include <linux/mfd/core.h>
     16#include <linux/mfd/ti-lmu.h>
     17#include <linux/mfd/ti-lmu-register.h>
     18#include <linux/module.h>
     19#include <linux/of.h>
     20#include <linux/of_device.h>
     21#include <linux/slab.h>
     22
     23struct ti_lmu_data {
     24	const struct mfd_cell *cells;
     25	int num_cells;
     26	unsigned int max_register;
     27};
     28
     29static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
     30{
     31	if (lmu->en_gpio)
     32		gpiod_set_value(lmu->en_gpio, 1);
     33
     34	/* Delay about 1ms after HW enable pin control */
     35	usleep_range(1000, 1500);
     36
     37	/* LM3631 has additional power up sequence - enable LCD_EN bit. */
     38	if (id == LM3631) {
     39		return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
     40					  LM3631_LCD_EN_MASK,
     41					  LM3631_LCD_EN_MASK);
     42	}
     43
     44	return 0;
     45}
     46
     47static void ti_lmu_disable_hw(void *data)
     48{
     49	struct ti_lmu *lmu = data;
     50	if (lmu->en_gpio)
     51		gpiod_set_value(lmu->en_gpio, 0);
     52}
     53
     54#define LM363X_REGULATOR(_id)			\
     55{						\
     56	.name          = "lm363x-regulator",	\
     57	.id            = _id,			\
     58	.of_compatible = "ti,lm363x-regulator",	\
     59}						\
     60
     61static const struct mfd_cell lm3631_devices[] = {
     62	LM363X_REGULATOR(LM3631_BOOST),
     63	LM363X_REGULATOR(LM3631_LDO_CONT),
     64	LM363X_REGULATOR(LM3631_LDO_OREF),
     65	LM363X_REGULATOR(LM3631_LDO_POS),
     66	LM363X_REGULATOR(LM3631_LDO_NEG),
     67	{
     68		.name          = "ti-lmu-backlight",
     69		.id            = LM3631,
     70		.of_compatible = "ti,lm3631-backlight",
     71	},
     72};
     73
     74static const struct mfd_cell lm3632_devices[] = {
     75	LM363X_REGULATOR(LM3632_BOOST),
     76	LM363X_REGULATOR(LM3632_LDO_POS),
     77	LM363X_REGULATOR(LM3632_LDO_NEG),
     78	{
     79		.name          = "ti-lmu-backlight",
     80		.id            = LM3632,
     81		.of_compatible = "ti,lm3632-backlight",
     82	},
     83};
     84
     85static const struct mfd_cell lm3633_devices[] = {
     86	{
     87		.name          = "ti-lmu-backlight",
     88		.id            = LM3633,
     89		.of_compatible = "ti,lm3633-backlight",
     90	},
     91	{
     92		.name          = "lm3633-leds",
     93		.of_compatible = "ti,lm3633-leds",
     94	},
     95	/* Monitoring driver for open/short circuit detection */
     96	{
     97		.name          = "ti-lmu-fault-monitor",
     98		.id            = LM3633,
     99		.of_compatible = "ti,lm3633-fault-monitor",
    100	},
    101};
    102
    103static const struct mfd_cell lm3695_devices[] = {
    104	{
    105		.name          = "ti-lmu-backlight",
    106		.id            = LM3695,
    107		.of_compatible = "ti,lm3695-backlight",
    108	},
    109};
    110
    111static const struct mfd_cell lm36274_devices[] = {
    112	LM363X_REGULATOR(LM36274_BOOST),
    113	LM363X_REGULATOR(LM36274_LDO_POS),
    114	LM363X_REGULATOR(LM36274_LDO_NEG),
    115	{
    116		.name          = "lm36274-leds",
    117		.id            = LM36274,
    118		.of_compatible = "ti,lm36274-backlight",
    119	},
    120};
    121
    122#define TI_LMU_DATA(chip, max_reg)		\
    123static const struct ti_lmu_data chip##_data =	\
    124{						\
    125	.cells = chip##_devices,		\
    126	.num_cells = ARRAY_SIZE(chip##_devices),\
    127	.max_register = max_reg,		\
    128}						\
    129
    130TI_LMU_DATA(lm3631, LM3631_MAX_REG);
    131TI_LMU_DATA(lm3632, LM3632_MAX_REG);
    132TI_LMU_DATA(lm3633, LM3633_MAX_REG);
    133TI_LMU_DATA(lm3695, LM3695_MAX_REG);
    134TI_LMU_DATA(lm36274, LM36274_MAX_REG);
    135
    136static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
    137{
    138	struct device *dev = &cl->dev;
    139	const struct ti_lmu_data *data;
    140	struct regmap_config regmap_cfg;
    141	struct ti_lmu *lmu;
    142	int ret;
    143
    144	/*
    145	 * Get device specific data from of_match table.
    146	 * This data is defined by using TI_LMU_DATA() macro.
    147	 */
    148	data = of_device_get_match_data(dev);
    149	if (!data)
    150		return -ENODEV;
    151
    152	lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
    153	if (!lmu)
    154		return -ENOMEM;
    155
    156	lmu->dev = &cl->dev;
    157
    158	/* Setup regmap */
    159	memset(&regmap_cfg, 0, sizeof(struct regmap_config));
    160	regmap_cfg.reg_bits = 8;
    161	regmap_cfg.val_bits = 8;
    162	regmap_cfg.name = id->name;
    163	regmap_cfg.max_register = data->max_register;
    164
    165	lmu->regmap = devm_regmap_init_i2c(cl, &regmap_cfg);
    166	if (IS_ERR(lmu->regmap))
    167		return PTR_ERR(lmu->regmap);
    168
    169	/* HW enable pin control and additional power up sequence if required */
    170	lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
    171	if (IS_ERR(lmu->en_gpio)) {
    172		ret = PTR_ERR(lmu->en_gpio);
    173		dev_err(dev, "Can not request enable GPIO: %d\n", ret);
    174		return ret;
    175	}
    176
    177	ret = ti_lmu_enable_hw(lmu, id->driver_data);
    178	if (ret)
    179		return ret;
    180
    181	ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
    182	if (ret)
    183		return ret;
    184
    185	/*
    186	 * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
    187	 * After fault detection is done, some devices should re-initialize
    188	 * configuration. The notifier enables such kind of handling.
    189	 */
    190	BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
    191
    192	i2c_set_clientdata(cl, lmu);
    193
    194	return devm_mfd_add_devices(lmu->dev, 0, data->cells,
    195				    data->num_cells, NULL, 0, NULL);
    196}
    197
    198static const struct of_device_id ti_lmu_of_match[] = {
    199	{ .compatible = "ti,lm3631", .data = &lm3631_data },
    200	{ .compatible = "ti,lm3632", .data = &lm3632_data },
    201	{ .compatible = "ti,lm3633", .data = &lm3633_data },
    202	{ .compatible = "ti,lm3695", .data = &lm3695_data },
    203	{ .compatible = "ti,lm36274", .data = &lm36274_data },
    204	{ }
    205};
    206MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
    207
    208static const struct i2c_device_id ti_lmu_ids[] = {
    209	{ "lm3631", LM3631 },
    210	{ "lm3632", LM3632 },
    211	{ "lm3633", LM3633 },
    212	{ "lm3695", LM3695 },
    213	{ "lm36274", LM36274 },
    214	{ }
    215};
    216MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
    217
    218static struct i2c_driver ti_lmu_driver = {
    219	.probe = ti_lmu_probe,
    220	.driver = {
    221		.name = "ti-lmu",
    222		.of_match_table = ti_lmu_of_match,
    223	},
    224	.id_table = ti_lmu_ids,
    225};
    226
    227module_i2c_driver(ti_lmu_driver);
    228
    229MODULE_DESCRIPTION("TI LMU MFD Core Driver");
    230MODULE_AUTHOR("Milo Kim");
    231MODULE_LICENSE("GPL v2");