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

gpio-da9055.c (4171B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * GPIO Driver for Dialog DA9055 PMICs.
      4 *
      5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
      6 *
      7 * Author: David Dajun Chen <dchen@diasemi.com>
      8 */
      9#include <linux/module.h>
     10#include <linux/platform_device.h>
     11#include <linux/gpio/driver.h>
     12
     13#include <linux/mfd/da9055/core.h>
     14#include <linux/mfd/da9055/reg.h>
     15#include <linux/mfd/da9055/pdata.h>
     16
     17#define DA9055_VDD_IO			0x0
     18#define DA9055_PUSH_PULL		0x3
     19#define DA9055_ACT_LOW			0x0
     20#define DA9055_GPI			0x1
     21#define DA9055_PORT_MASK		0x3
     22#define DA9055_PORT_SHIFT(offset)	(4 * (offset % 2))
     23
     24#define DA9055_INPUT			DA9055_GPI
     25#define DA9055_OUTPUT			DA9055_PUSH_PULL
     26#define DA9055_IRQ_GPI0			3
     27
     28struct da9055_gpio {
     29	struct da9055 *da9055;
     30	struct gpio_chip gp;
     31};
     32
     33static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
     34{
     35	struct da9055_gpio *gpio = gpiochip_get_data(gc);
     36	int gpio_direction = 0;
     37	int ret;
     38
     39	/* Get GPIO direction */
     40	ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
     41	if (ret < 0)
     42		return ret;
     43
     44	gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
     45	gpio_direction >>= DA9055_PORT_SHIFT(offset);
     46	switch (gpio_direction) {
     47	case DA9055_INPUT:
     48		ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
     49		if (ret < 0)
     50			return ret;
     51		break;
     52	case DA9055_OUTPUT:
     53		ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
     54		if (ret < 0)
     55			return ret;
     56	}
     57
     58	return ret & (1 << offset);
     59
     60}
     61
     62static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
     63{
     64	struct da9055_gpio *gpio = gpiochip_get_data(gc);
     65
     66	da9055_reg_update(gpio->da9055,
     67			DA9055_REG_GPIO_MODE0_2,
     68			1 << offset,
     69			value << offset);
     70}
     71
     72static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
     73{
     74	struct da9055_gpio *gpio = gpiochip_get_data(gc);
     75	unsigned char reg_byte;
     76
     77	reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
     78				<< DA9055_PORT_SHIFT(offset);
     79
     80	return da9055_reg_update(gpio->da9055, (offset >> 1) +
     81				DA9055_REG_GPIO0_1,
     82				DA9055_PORT_MASK <<
     83				DA9055_PORT_SHIFT(offset),
     84				reg_byte);
     85}
     86
     87static int da9055_gpio_direction_output(struct gpio_chip *gc,
     88					unsigned offset, int value)
     89{
     90	struct da9055_gpio *gpio = gpiochip_get_data(gc);
     91	unsigned char reg_byte;
     92	int ret;
     93
     94	reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
     95					<< DA9055_PORT_SHIFT(offset);
     96
     97	ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
     98				DA9055_REG_GPIO0_1,
     99				DA9055_PORT_MASK <<
    100				DA9055_PORT_SHIFT(offset),
    101				reg_byte);
    102	if (ret < 0)
    103		return ret;
    104
    105	da9055_gpio_set(gc, offset, value);
    106
    107	return 0;
    108}
    109
    110static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
    111{
    112	struct da9055_gpio *gpio = gpiochip_get_data(gc);
    113	struct da9055 *da9055 = gpio->da9055;
    114
    115	return regmap_irq_get_virq(da9055->irq_data,
    116				  DA9055_IRQ_GPI0 + offset);
    117}
    118
    119static const struct gpio_chip reference_gp = {
    120	.label = "da9055-gpio",
    121	.owner = THIS_MODULE,
    122	.get = da9055_gpio_get,
    123	.set = da9055_gpio_set,
    124	.direction_input = da9055_gpio_direction_input,
    125	.direction_output = da9055_gpio_direction_output,
    126	.to_irq = da9055_gpio_to_irq,
    127	.can_sleep = true,
    128	.ngpio = 3,
    129	.base = -1,
    130};
    131
    132static int da9055_gpio_probe(struct platform_device *pdev)
    133{
    134	struct da9055_gpio *gpio;
    135	struct da9055_pdata *pdata;
    136
    137	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
    138	if (!gpio)
    139		return -ENOMEM;
    140
    141	gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
    142	pdata = dev_get_platdata(gpio->da9055->dev);
    143
    144	gpio->gp = reference_gp;
    145	if (pdata && pdata->gpio_base)
    146		gpio->gp.base = pdata->gpio_base;
    147
    148	return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
    149}
    150
    151static struct platform_driver da9055_gpio_driver = {
    152	.probe = da9055_gpio_probe,
    153	.driver = {
    154		.name	= "da9055-gpio",
    155	},
    156};
    157
    158static int __init da9055_gpio_init(void)
    159{
    160	return platform_driver_register(&da9055_gpio_driver);
    161}
    162subsys_initcall(da9055_gpio_init);
    163
    164static void __exit da9055_gpio_exit(void)
    165{
    166	platform_driver_unregister(&da9055_gpio_driver);
    167}
    168module_exit(da9055_gpio_exit);
    169
    170MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
    171MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
    172MODULE_LICENSE("GPL");
    173MODULE_ALIAS("platform:da9055-gpio");