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linux/drivers/gpio/gpio-max77620.c
Jon Hunter 7f42aa7b00 gpio: max77620: Make the irqchip immutable 
Commit 6c846d026d ("gpio: Don't fiddle with irqchips marked as
immutable") added a warning to indicate if the gpiolib is altering the
internals of irqchips. Following this change the following warning is
now observed for the max77620 gpio driver ...

 WARNING KERN gpio gpiochip0: (max77620-gpio): not an immutable chip,
 	please consider fixing it!

Fix the above warning by making the max77620 gpio driver immutable.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2022-05-05 14:56:37 +02:00

372 lines
9.6 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* MAXIM MAX77620 GPIO driver
*
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/mfd/max77620.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset)
struct max77620_gpio {
struct gpio_chip gpio_chip;
struct regmap *rmap;
struct device *dev;
struct mutex buslock; /* irq_bus_lock */
unsigned int irq_type[MAX77620_GPIO_NR];
bool irq_enabled[MAX77620_GPIO_NR];
};
static irqreturn_t max77620_gpio_irqhandler(int irq, void *data)
{
struct max77620_gpio *gpio = data;
unsigned int value, offset;
unsigned long pending;
int err;
err = regmap_read(gpio->rmap, MAX77620_REG_IRQ_LVL2_GPIO, &value);
if (err < 0) {
dev_err(gpio->dev, "REG_IRQ_LVL2_GPIO read failed: %d\n", err);
return IRQ_NONE;
}
pending = value;
for_each_set_bit(offset, &pending, MAX77620_GPIO_NR) {
unsigned int virq;
virq = irq_find_mapping(gpio->gpio_chip.irq.domain, offset);
handle_nested_irq(virq);
}
return IRQ_HANDLED;
}
static void max77620_gpio_irq_mask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct max77620_gpio *gpio = gpiochip_get_data(chip);
gpio->irq_enabled[data->hwirq] = false;
gpiochip_disable_irq(chip, data->hwirq);
}
static void max77620_gpio_irq_unmask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct max77620_gpio *gpio = gpiochip_get_data(chip);
gpiochip_enable_irq(chip, data->hwirq);
gpio->irq_enabled[data->hwirq] = true;
}
static int max77620_gpio_set_irq_type(struct irq_data *data, unsigned int type)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct max77620_gpio *gpio = gpiochip_get_data(chip);
unsigned int irq_type;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
irq_type = MAX77620_CNFG_GPIO_INT_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
irq_type = MAX77620_CNFG_GPIO_INT_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
irq_type = MAX77620_CNFG_GPIO_INT_RISING |
MAX77620_CNFG_GPIO_INT_FALLING;
break;
default:
return -EINVAL;
}
gpio->irq_type[data->hwirq] = irq_type;
return 0;
}
static void max77620_gpio_bus_lock(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct max77620_gpio *gpio = gpiochip_get_data(chip);
mutex_lock(&gpio->buslock);
}
static void max77620_gpio_bus_sync_unlock(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct max77620_gpio *gpio = gpiochip_get_data(chip);
unsigned int value, offset = data->hwirq;
int err;
value = gpio->irq_enabled[offset] ? gpio->irq_type[offset] : 0;
err = regmap_update_bits(gpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_INT_MASK, value);
if (err < 0)
dev_err(chip->parent, "failed to update interrupt mask: %d\n",
err);
mutex_unlock(&gpio->buslock);
}
static const struct irq_chip max77620_gpio_irqchip = {
.name = "max77620-gpio",
.irq_mask = max77620_gpio_irq_mask,
.irq_unmask = max77620_gpio_irq_unmask,
.irq_set_type = max77620_gpio_set_irq_type,
.irq_bus_lock = max77620_gpio_bus_lock,
.irq_bus_sync_unlock = max77620_gpio_bus_sync_unlock,
.flags = IRQCHIP_IMMUTABLE | IRQCHIP_MASK_ON_SUSPEND,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
{
struct max77620_gpio *mgpio = gpiochip_get_data(gc);
int ret;
ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_DIR_MASK,
MAX77620_CNFG_GPIO_DIR_INPUT);
if (ret < 0)
dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
return ret;
}
static int max77620_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct max77620_gpio *mgpio = gpiochip_get_data(gc);
unsigned int val;
int ret;
ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
if (ret < 0) {
dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret);
return ret;
}
if (val & MAX77620_CNFG_GPIO_DIR_MASK)
return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK);
else
return !!(val & MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK);
}
static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct max77620_gpio *mgpio = gpiochip_get_data(gc);
u8 val;
int ret;
val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
if (ret < 0) {
dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret);
return ret;
}
ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_DIR_MASK,
MAX77620_CNFG_GPIO_DIR_OUTPUT);
if (ret < 0)
dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
return ret;
}
static int max77620_gpio_set_debounce(struct max77620_gpio *mgpio,
unsigned int offset,
unsigned int debounce)
{
u8 val;
int ret;
switch (debounce) {
case 0:
val = MAX77620_CNFG_GPIO_DBNC_None;
break;
case 1 ... 8000:
val = MAX77620_CNFG_GPIO_DBNC_8ms;
break;
case 8001 ... 16000:
val = MAX77620_CNFG_GPIO_DBNC_16ms;
break;
case 16001 ... 32000:
val = MAX77620_CNFG_GPIO_DBNC_32ms;
break;
default:
dev_err(mgpio->dev, "Illegal value %u\n", debounce);
return -EINVAL;
}
ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_DBNC_MASK, val);
if (ret < 0)
dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret);
return ret;
}
static void max77620_gpio_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct max77620_gpio *mgpio = gpiochip_get_data(gc);
u8 val;
int ret;
val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
if (ret < 0)
dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret);
}
static int max77620_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config)
{
struct max77620_gpio *mgpio = gpiochip_get_data(gc);
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_DRV_MASK,
MAX77620_CNFG_GPIO_DRV_OPENDRAIN);
case PIN_CONFIG_DRIVE_PUSH_PULL:
return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
MAX77620_CNFG_GPIO_DRV_MASK,
MAX77620_CNFG_GPIO_DRV_PUSHPULL);
case PIN_CONFIG_INPUT_DEBOUNCE:
return max77620_gpio_set_debounce(mgpio, offset,
pinconf_to_config_argument(config));
default:
break;
}
return -ENOTSUPP;
}
static int max77620_gpio_irq_init_hw(struct gpio_chip *gc)
{
struct max77620_gpio *gpio = gpiochip_get_data(gc);
unsigned int i;
int err;
/*
* GPIO interrupts may be left ON after bootloader, hence let's
* pre-initialize hardware to the expected state by disabling all
* the interrupts.
*/
for (i = 0; i < MAX77620_GPIO_NR; i++) {
err = regmap_update_bits(gpio->rmap, GPIO_REG_ADDR(i),
MAX77620_CNFG_GPIO_INT_MASK, 0);
if (err < 0) {
dev_err(gpio->dev,
"failed to disable interrupt: %d\n", err);
return err;
}
}
return 0;
}
static int max77620_gpio_probe(struct platform_device *pdev)
{
struct max77620_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct max77620_gpio *mgpio;
struct gpio_irq_chip *girq;
unsigned int gpio_irq;
int ret;
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
gpio_irq = ret;
mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
if (!mgpio)
return -ENOMEM;
mutex_init(&mgpio->buslock);
mgpio->rmap = chip->rmap;
mgpio->dev = &pdev->dev;
mgpio->gpio_chip.label = pdev->name;
mgpio->gpio_chip.parent = pdev->dev.parent;
mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
mgpio->gpio_chip.get = max77620_gpio_get;
mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
mgpio->gpio_chip.set = max77620_gpio_set;
mgpio->gpio_chip.set_config = max77620_gpio_set_config;
mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
mgpio->gpio_chip.can_sleep = 1;
mgpio->gpio_chip.base = -1;
girq = &mgpio->gpio_chip.irq;
gpio_irq_chip_set_chip(girq, &max77620_gpio_irqchip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;
girq->parents = NULL;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_edge_irq;
girq->init_hw = max77620_gpio_irq_init_hw;
girq->threaded = true;
platform_set_drvdata(pdev, mgpio);
ret = devm_gpiochip_add_data(&pdev->dev, &mgpio->gpio_chip, mgpio);
if (ret < 0) {
dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n");
return ret;
}
ret = devm_request_threaded_irq(&pdev->dev, gpio_irq, NULL,
max77620_gpio_irqhandler, IRQF_ONESHOT,
"max77620-gpio", mgpio);
if (ret < 0) {
dev_err(&pdev->dev, "failed to request IRQ: %d\n", ret);
return ret;
}
return 0;
}
static const struct platform_device_id max77620_gpio_devtype[] = {
{ .name = "max77620-gpio", },
{ .name = "max20024-gpio", },
{},
};
MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype);
static struct platform_driver max77620_gpio_driver = {
.driver.name = "max77620-gpio",
.probe = max77620_gpio_probe,
.id_table = max77620_gpio_devtype,
};
module_platform_driver(max77620_gpio_driver);
MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
MODULE_LICENSE("GPL v2");
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