| // 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; |
| }; |
| |
| static const struct regmap_irq max77620_gpio_irqs[] = { |
| [0] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE0, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 0, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| [1] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE1, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 1, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| [2] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE2, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 2, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| [3] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE3, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 3, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| [4] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE4, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 4, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| [5] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE5, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 5, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| [6] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE6, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 6, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| [7] = { |
| .reg_offset = 0, |
| .mask = MAX77620_IRQ_LVL2_GPIO_EDGE7, |
| .type = { |
| .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING, |
| .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING, |
| .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK, |
| .type_reg_offset = 7, |
| .types_supported = IRQ_TYPE_EDGE_BOTH, |
| }, |
| }, |
| }; |
| |
| static const struct regmap_irq_chip max77620_gpio_irq_chip = { |
| .name = "max77620-gpio", |
| .irqs = max77620_gpio_irqs, |
| .num_irqs = ARRAY_SIZE(max77620_gpio_irqs), |
| .num_regs = 1, |
| .num_type_reg = 8, |
| .irq_reg_stride = 1, |
| .type_reg_stride = 1, |
| .status_base = MAX77620_REG_IRQ_LVL2_GPIO, |
| .type_base = MAX77620_REG_GPIO0, |
| }; |
| |
| 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 ... 8: |
| val = MAX77620_CNFG_GPIO_DBNC_8ms; |
| break; |
| case 9 ... 16: |
| val = MAX77620_CNFG_GPIO_DBNC_16ms; |
| break; |
| case 17 ... 32: |
| 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_to_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct max77620_gpio *mgpio = gpiochip_get_data(gc); |
| struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent); |
| |
| return regmap_irq_get_virq(chip->gpio_irq_data, offset); |
| } |
| |
| static int max77620_gpio_probe(struct platform_device *pdev) |
| { |
| struct max77620_chip *chip = dev_get_drvdata(pdev->dev.parent); |
| struct max77620_gpio *mgpio; |
| int gpio_irq; |
| int ret; |
| |
| gpio_irq = platform_get_irq(pdev, 0); |
| if (gpio_irq <= 0) |
| return -ENODEV; |
| |
| mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL); |
| if (!mgpio) |
| return -ENOMEM; |
| |
| mgpio->rmap = chip->rmap; |
| mgpio->dev = &pdev->dev; |
| |
| mgpio->gpio_chip.label = pdev->name; |
| mgpio->gpio_chip.parent = &pdev->dev; |
| 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.to_irq = max77620_gpio_to_irq; |
| mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR; |
| mgpio->gpio_chip.can_sleep = 1; |
| mgpio->gpio_chip.base = -1; |
| #ifdef CONFIG_OF_GPIO |
| mgpio->gpio_chip.of_node = pdev->dev.parent->of_node; |
| #endif |
| |
| 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_regmap_add_irq_chip(&pdev->dev, chip->rmap, gpio_irq, |
| IRQF_ONESHOT, -1, |
| &max77620_gpio_irq_chip, |
| &chip->gpio_irq_data); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "Failed to add gpio irq_chip %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_ALIAS("platform:max77620-gpio"); |
| MODULE_LICENSE("GPL v2"); |
