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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gpio-max77650.c (5147B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Copyright (C) 2018 BayLibre SAS
      4// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
      5//
      6// GPIO driver for MAXIM 77650/77651 charger/power-supply.
      7
      8#include <linux/gpio/driver.h>
      9#include <linux/i2c.h>
     10#include <linux/mfd/max77650.h>
     11#include <linux/module.h>
     12#include <linux/platform_device.h>
     13#include <linux/regmap.h>
     14
     15#define MAX77650_GPIO_DIR_MASK		BIT(0)
     16#define MAX77650_GPIO_INVAL_MASK	BIT(1)
     17#define MAX77650_GPIO_DRV_MASK		BIT(2)
     18#define MAX77650_GPIO_OUTVAL_MASK	BIT(3)
     19#define MAX77650_GPIO_DEBOUNCE_MASK	BIT(4)
     20
     21#define MAX77650_GPIO_DIR_OUT		0x00
     22#define MAX77650_GPIO_DIR_IN		BIT(0)
     23#define MAX77650_GPIO_OUT_LOW		0x00
     24#define MAX77650_GPIO_OUT_HIGH		BIT(3)
     25#define MAX77650_GPIO_DRV_OPEN_DRAIN	0x00
     26#define MAX77650_GPIO_DRV_PUSH_PULL	BIT(2)
     27#define MAX77650_GPIO_DEBOUNCE		BIT(4)
     28
     29#define MAX77650_GPIO_DIR_BITS(_reg) \
     30		((_reg) & MAX77650_GPIO_DIR_MASK)
     31#define MAX77650_GPIO_INVAL_BITS(_reg) \
     32		(((_reg) & MAX77650_GPIO_INVAL_MASK) >> 1)
     33
     34struct max77650_gpio_chip {
     35	struct regmap *map;
     36	struct gpio_chip gc;
     37	int irq;
     38};
     39
     40static int max77650_gpio_direction_input(struct gpio_chip *gc,
     41					 unsigned int offset)
     42{
     43	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
     44
     45	return regmap_update_bits(chip->map,
     46				  MAX77650_REG_CNFG_GPIO,
     47				  MAX77650_GPIO_DIR_MASK,
     48				  MAX77650_GPIO_DIR_IN);
     49}
     50
     51static int max77650_gpio_direction_output(struct gpio_chip *gc,
     52					  unsigned int offset, int value)
     53{
     54	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
     55	int mask, regval;
     56
     57	mask = MAX77650_GPIO_DIR_MASK | MAX77650_GPIO_OUTVAL_MASK;
     58	regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
     59	regval |= MAX77650_GPIO_DIR_OUT;
     60
     61	return regmap_update_bits(chip->map,
     62				  MAX77650_REG_CNFG_GPIO, mask, regval);
     63}
     64
     65static void max77650_gpio_set_value(struct gpio_chip *gc,
     66				    unsigned int offset, int value)
     67{
     68	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
     69	int rv, regval;
     70
     71	regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
     72
     73	rv = regmap_update_bits(chip->map, MAX77650_REG_CNFG_GPIO,
     74				MAX77650_GPIO_OUTVAL_MASK, regval);
     75	if (rv)
     76		dev_err(gc->parent, "cannot set GPIO value: %d\n", rv);
     77}
     78
     79static int max77650_gpio_get_value(struct gpio_chip *gc,
     80				   unsigned int offset)
     81{
     82	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
     83	unsigned int val;
     84	int rv;
     85
     86	rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
     87	if (rv)
     88		return rv;
     89
     90	return MAX77650_GPIO_INVAL_BITS(val);
     91}
     92
     93static int max77650_gpio_get_direction(struct gpio_chip *gc,
     94				       unsigned int offset)
     95{
     96	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
     97	unsigned int val;
     98	int rv;
     99
    100	rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
    101	if (rv)
    102		return rv;
    103
    104	return MAX77650_GPIO_DIR_BITS(val);
    105}
    106
    107static int max77650_gpio_set_config(struct gpio_chip *gc,
    108				    unsigned int offset, unsigned long cfg)
    109{
    110	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    111
    112	switch (pinconf_to_config_param(cfg)) {
    113	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
    114		return regmap_update_bits(chip->map,
    115					  MAX77650_REG_CNFG_GPIO,
    116					  MAX77650_GPIO_DRV_MASK,
    117					  MAX77650_GPIO_DRV_OPEN_DRAIN);
    118	case PIN_CONFIG_DRIVE_PUSH_PULL:
    119		return regmap_update_bits(chip->map,
    120					  MAX77650_REG_CNFG_GPIO,
    121					  MAX77650_GPIO_DRV_MASK,
    122					  MAX77650_GPIO_DRV_PUSH_PULL);
    123	case PIN_CONFIG_INPUT_DEBOUNCE:
    124		return regmap_update_bits(chip->map,
    125					  MAX77650_REG_CNFG_GPIO,
    126					  MAX77650_GPIO_DEBOUNCE_MASK,
    127					  MAX77650_GPIO_DEBOUNCE);
    128	default:
    129		return -ENOTSUPP;
    130	}
    131}
    132
    133static int max77650_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
    134{
    135	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    136
    137	return chip->irq;
    138}
    139
    140static int max77650_gpio_probe(struct platform_device *pdev)
    141{
    142	struct max77650_gpio_chip *chip;
    143	struct device *dev, *parent;
    144	struct i2c_client *i2c;
    145
    146	dev = &pdev->dev;
    147	parent = dev->parent;
    148	i2c = to_i2c_client(parent);
    149
    150	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
    151	if (!chip)
    152		return -ENOMEM;
    153
    154	chip->map = dev_get_regmap(parent, NULL);
    155	if (!chip->map)
    156		return -ENODEV;
    157
    158	chip->irq = platform_get_irq_byname(pdev, "GPI");
    159	if (chip->irq < 0)
    160		return chip->irq;
    161
    162	chip->gc.base = -1;
    163	chip->gc.ngpio = 1;
    164	chip->gc.label = i2c->name;
    165	chip->gc.parent = dev;
    166	chip->gc.owner = THIS_MODULE;
    167	chip->gc.can_sleep = true;
    168
    169	chip->gc.direction_input = max77650_gpio_direction_input;
    170	chip->gc.direction_output = max77650_gpio_direction_output;
    171	chip->gc.set = max77650_gpio_set_value;
    172	chip->gc.get = max77650_gpio_get_value;
    173	chip->gc.get_direction = max77650_gpio_get_direction;
    174	chip->gc.set_config = max77650_gpio_set_config;
    175	chip->gc.to_irq = max77650_gpio_to_irq;
    176
    177	return devm_gpiochip_add_data(dev, &chip->gc, chip);
    178}
    179
    180static struct platform_driver max77650_gpio_driver = {
    181	.driver = {
    182		.name = "max77650-gpio",
    183	},
    184	.probe = max77650_gpio_probe,
    185};
    186module_platform_driver(max77650_gpio_driver);
    187
    188MODULE_DESCRIPTION("MAXIM 77650/77651 GPIO driver");
    189MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
    190MODULE_LICENSE("GPL v2");
    191MODULE_ALIAS("platform:max77650-gpio");