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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tps6105x.c (5796B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Core driver for TPS61050/61052 boost converters, used for while LED
      4 * driving, audio power amplification, white LED flash, and generic
      5 * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
      6 * and a flash synchronization pin to synchronize flash events when used as
      7 * flashgun.
      8 *
      9 * Copyright (C) 2011 ST-Ericsson SA
     10 * Written on behalf of Linaro for ST-Ericsson
     11 *
     12 * Author: Linus Walleij <linus.walleij@linaro.org>
     13 */
     14
     15#include <linux/module.h>
     16#include <linux/init.h>
     17#include <linux/i2c.h>
     18#include <linux/regmap.h>
     19#include <linux/gpio.h>
     20#include <linux/spinlock.h>
     21#include <linux/slab.h>
     22#include <linux/err.h>
     23#include <linux/mfd/core.h>
     24#include <linux/mfd/tps6105x.h>
     25
     26static struct regmap_config tps6105x_regmap_config = {
     27	.reg_bits = 8,
     28	.val_bits = 8,
     29	.max_register = TPS6105X_REG_3,
     30};
     31
     32static int tps6105x_startup(struct tps6105x *tps6105x)
     33{
     34	int ret;
     35	unsigned int regval;
     36
     37	ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
     38	if (ret)
     39		return ret;
     40	switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
     41	case TPS6105X_REG0_MODE_SHUTDOWN:
     42		dev_info(&tps6105x->client->dev,
     43			 "TPS6105x found in SHUTDOWN mode\n");
     44		break;
     45	case TPS6105X_REG0_MODE_TORCH:
     46		dev_info(&tps6105x->client->dev,
     47			 "TPS6105x found in TORCH mode\n");
     48		break;
     49	case TPS6105X_REG0_MODE_TORCH_FLASH:
     50		dev_info(&tps6105x->client->dev,
     51			 "TPS6105x found in FLASH mode\n");
     52		break;
     53	case TPS6105X_REG0_MODE_VOLTAGE:
     54		dev_info(&tps6105x->client->dev,
     55			 "TPS6105x found in VOLTAGE mode\n");
     56		break;
     57	default:
     58		break;
     59	}
     60
     61	return ret;
     62}
     63
     64/*
     65 * MFD cells - we always have a GPIO cell and we have one cell
     66 * which is selected operation mode.
     67 */
     68static struct mfd_cell tps6105x_gpio_cell = {
     69	.name = "tps6105x-gpio",
     70};
     71
     72static struct mfd_cell tps6105x_leds_cell = {
     73	.name = "tps6105x-leds",
     74};
     75
     76static struct mfd_cell tps6105x_flash_cell = {
     77	.name = "tps6105x-flash",
     78};
     79
     80static struct mfd_cell tps6105x_regulator_cell = {
     81	.name = "tps6105x-regulator",
     82};
     83
     84static int tps6105x_add_device(struct tps6105x *tps6105x,
     85			       struct mfd_cell *cell)
     86{
     87	cell->platform_data = tps6105x;
     88	cell->pdata_size = sizeof(*tps6105x);
     89
     90	return mfd_add_devices(&tps6105x->client->dev,
     91			       PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
     92}
     93
     94static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev)
     95{
     96	struct device_node *np = dev->of_node;
     97	struct tps6105x_platform_data *pdata;
     98	struct device_node *child;
     99
    100	if (!np)
    101		return ERR_PTR(-EINVAL);
    102	if (of_get_available_child_count(np) > 1) {
    103		dev_err(dev, "cannot support multiple operational modes");
    104		return ERR_PTR(-EINVAL);
    105	}
    106	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
    107	if (!pdata)
    108		return ERR_PTR(-ENOMEM);
    109	pdata->mode = TPS6105X_MODE_SHUTDOWN;
    110	for_each_available_child_of_node(np, child) {
    111		if (child->name && !of_node_cmp(child->name, "regulator"))
    112			pdata->mode = TPS6105X_MODE_VOLTAGE;
    113		else if (child->name && !of_node_cmp(child->name, "led"))
    114			pdata->mode = TPS6105X_MODE_TORCH;
    115	}
    116
    117	return pdata;
    118}
    119
    120static int tps6105x_probe(struct i2c_client *client,
    121			const struct i2c_device_id *id)
    122{
    123	struct tps6105x			*tps6105x;
    124	struct tps6105x_platform_data	*pdata;
    125	int ret;
    126
    127	pdata = dev_get_platdata(&client->dev);
    128	if (!pdata)
    129		pdata = tps6105x_parse_dt(&client->dev);
    130	if (IS_ERR(pdata)) {
    131		dev_err(&client->dev, "No platform data or DT found");
    132		return PTR_ERR(pdata);
    133	}
    134
    135	tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
    136	if (!tps6105x)
    137		return -ENOMEM;
    138
    139	tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
    140	if (IS_ERR(tps6105x->regmap))
    141		return PTR_ERR(tps6105x->regmap);
    142
    143	i2c_set_clientdata(client, tps6105x);
    144	tps6105x->client = client;
    145	tps6105x->pdata = pdata;
    146
    147	ret = tps6105x_startup(tps6105x);
    148	if (ret) {
    149		dev_err(&client->dev, "chip initialization failed\n");
    150		return ret;
    151	}
    152
    153	ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
    154	if (ret)
    155		return ret;
    156
    157	switch (pdata->mode) {
    158	case TPS6105X_MODE_SHUTDOWN:
    159		dev_info(&client->dev,
    160			 "present, not used for anything, only GPIO\n");
    161		break;
    162	case TPS6105X_MODE_TORCH:
    163		ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
    164		break;
    165	case TPS6105X_MODE_TORCH_FLASH:
    166		ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
    167		break;
    168	case TPS6105X_MODE_VOLTAGE:
    169		ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
    170		break;
    171	default:
    172		dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
    173		break;
    174	}
    175
    176	if (ret)
    177		mfd_remove_devices(&client->dev);
    178
    179	return ret;
    180}
    181
    182static int tps6105x_remove(struct i2c_client *client)
    183{
    184	struct tps6105x *tps6105x = i2c_get_clientdata(client);
    185
    186	mfd_remove_devices(&client->dev);
    187
    188	/* Put chip in shutdown mode */
    189	regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
    190		TPS6105X_REG0_MODE_MASK,
    191		TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
    192
    193	return 0;
    194}
    195
    196static const struct i2c_device_id tps6105x_id[] = {
    197	{ "tps61050", 0 },
    198	{ "tps61052", 0 },
    199	{ }
    200};
    201MODULE_DEVICE_TABLE(i2c, tps6105x_id);
    202
    203static const struct of_device_id tps6105x_of_match[] = {
    204	{ .compatible = "ti,tps61050" },
    205	{ .compatible = "ti,tps61052" },
    206	{ },
    207};
    208MODULE_DEVICE_TABLE(of, tps6105x_of_match);
    209
    210static struct i2c_driver tps6105x_driver = {
    211	.driver = {
    212		.name	= "tps6105x",
    213		.of_match_table = tps6105x_of_match,
    214	},
    215	.probe		= tps6105x_probe,
    216	.remove		= tps6105x_remove,
    217	.id_table	= tps6105x_id,
    218};
    219
    220static int __init tps6105x_init(void)
    221{
    222	return i2c_add_driver(&tps6105x_driver);
    223}
    224subsys_initcall(tps6105x_init);
    225
    226static void __exit tps6105x_exit(void)
    227{
    228	i2c_del_driver(&tps6105x_driver);
    229}
    230module_exit(tps6105x_exit);
    231
    232MODULE_AUTHOR("Linus Walleij");
    233MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
    234MODULE_LICENSE("GPL v2");