MAXIM Semiconductor's PMIC, MAX77620/MAX20024 has 8 GPIO pins. It also supports interrupts from these pins. Add GPIO driver for these pins to control via GPIO APIs. Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx> Signed-off-by: Chaitanya Bandi <bandik@xxxxxxxxxx> --- - Use the gpiochip_add_data and get the chip data from core APIs. - Cleanups based on comment received on mfd/rtc. - Avoid duplication on error message. drivers/gpio/Kconfig | 9 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-max77620.c | 306 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 316 insertions(+) create mode 100644 drivers/gpio/gpio-max77620.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index f2b7160..b96a80c 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -797,6 +797,15 @@ config GPIO_LP3943 LP3943 can be used as a GPIO expander which provides up to 16 GPIOs. Open drain outputs are required for this usage. +config GPIO_MAX77620 + bool "GPIO support for PMIC MAX77620 and MAX20024" + depends on MFD_MAX77620 + help + GPIO driver for MAX77620 and MAX20024 PMIC from Maxim Semiconductor. + MAX77620 PMIC has 8 pins that can be configured as GPIOs. The + driver also provides interrupt support for each of the gpios. + Say yes here to enable the max77620 to be used as gpio controller. + config GPIO_MSIC bool "Intel MSIC mixed signal gpio support" depends on MFD_INTEL_MSIC diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index ece7d7c..f676a2d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -57,6 +57,7 @@ obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o obj-$(CONFIG_GPIO_MAX7301) += gpio-max7301.o obj-$(CONFIG_GPIO_MAX732X) += gpio-max732x.o +obj-$(CONFIG_GPIO_MAX77620) += gpio-max77620.o obj-$(CONFIG_GPIO_MB86S7X) += gpio-mb86s7x.o obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o diff --git a/drivers/gpio/gpio-max77620.c b/drivers/gpio/gpio-max77620.c new file mode 100644 index 0000000..3185e6a --- /dev/null +++ b/drivers/gpio/gpio-max77620.c @@ -0,0 +1,306 @@ +/* + * MAXIM MAX77620 GPIO driver + * + * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/platform_device.h> +#include <linux/mfd/max77620.h> + +#define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset) + +struct max77620_gpio { + struct gpio_chip gpio_chip; + struct device *parent; + struct device *dev; + int gpio_irq; + int irq_base; + int gpio_base; +}; + +static const struct regmap_irq max77620_gpio_irqs[] = { + [MAX77620_IRQ_GPIO0 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE0, + .reg_offset = 0, + }, + [MAX77620_IRQ_GPIO1 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE1, + .reg_offset = 0, + }, + [MAX77620_IRQ_GPIO2 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE2, + .reg_offset = 0, + }, + [MAX77620_IRQ_GPIO3 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE3, + .reg_offset = 0, + }, + [MAX77620_IRQ_GPIO4 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE4, + .reg_offset = 0, + }, + [MAX77620_IRQ_GPIO5 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE5, + .reg_offset = 0, + }, + [MAX77620_IRQ_GPIO6 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE6, + .reg_offset = 0, + }, + [MAX77620_IRQ_GPIO7 - MAX77620_IRQ_GPIO0] = { + .mask = MAX77620_IRQ_LVL2_GPIO_EDGE7, + .reg_offset = 0, + }, +}; + +static 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, + .irq_reg_stride = 1, + .status_base = MAX77620_REG_IRQ_LVL2_GPIO, +}; + +static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned offset) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + int ret; + + ret = max77620_reg_update(mgpio->parent, MAX77620_PWR_SLAVE, + 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 offset) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + u8 val; + int ret; + + ret = max77620_reg_read(mgpio->parent, MAX77620_PWR_SLAVE, + GPIO_REG_ADDR(offset), &val); + if (ret < 0) { + dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret); + return ret; + } + + return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK); +} + +static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned 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 = max77620_reg_update(mgpio->parent, MAX77620_PWR_SLAVE, + 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 = max77620_reg_update(mgpio->parent, MAX77620_PWR_SLAVE, + 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 gpio_chip *gc, + unsigned offset, unsigned debounce) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + 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 = max77620_reg_update(mgpio->parent, MAX77620_PWR_SLAVE, + 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 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 = max77620_reg_update(mgpio->parent, MAX77620_PWR_SLAVE, + 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_to_irq(struct gpio_chip *gc, unsigned 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 void max77620_gpio_irq_remove(struct max77620_gpio *mgpio) +{ + struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent); + + regmap_del_irq_chip(mgpio->gpio_irq, chip->gpio_irq_data); + chip->gpio_irq_data = NULL; +} + +static int max77620_gpio_probe(struct platform_device *pdev) +{ + struct max77620_gpio *mgpio; + struct max77620_chip *chip = dev_get_drvdata(pdev->dev.parent); + int ret; + int gpio_irq; + + gpio_irq = platform_get_irq(pdev, 0); + if (gpio_irq <= 0) { + dev_err(&pdev->dev, "Gpio irq not available %d\n", gpio_irq); + return -ENODEV; + } + + mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL); + if (!mgpio) + return -ENOMEM; + + mgpio->parent = pdev->dev.parent; + mgpio->dev = &pdev->dev; + mgpio->gpio_irq = gpio_irq; + + 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_debounce = max77620_gpio_set_debounce; + mgpio->gpio_chip.set = max77620_gpio_set; + 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; + mgpio->irq_base = -1; +#ifdef CONFIG_OF_GPIO + mgpio->gpio_chip.of_node = pdev->dev.parent->of_node; +#endif + + platform_set_drvdata(pdev, mgpio); + + ret = gpiochip_add_data(&mgpio->gpio_chip, mgpio); + if (ret < 0) { + dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n"); + return ret; + } + mgpio->gpio_base = mgpio->gpio_chip.base; + + ret = regmap_add_irq_chip(chip->rmap[MAX77620_PWR_SLAVE], + mgpio->gpio_irq, IRQF_ONESHOT | IRQF_EARLY_RESUME, + mgpio->irq_base, + &max77620_gpio_irq_chip, &chip->gpio_irq_data); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to add gpio irq_chip %d\n", ret); + goto fail; + } + + return 0; + +fail: + gpiochip_remove(&mgpio->gpio_chip); + + return ret; +} + +static int max77620_gpio_remove(struct platform_device *pdev) +{ + struct max77620_gpio *mgpio = platform_get_drvdata(pdev); + + max77620_gpio_irq_remove(mgpio); + gpiochip_remove(&mgpio->gpio_chip); + + return 0; +} + +static const struct platform_device_id max77620_gpio_devtype[] = { + { + .name = "max77620-gpio", + }, + { + .name = "max20024-gpio", + }, +}; + +static struct platform_driver max77620_gpio_driver = { + .driver.name = "max77620-gpio", + .driver.owner = THIS_MODULE, + .probe = max77620_gpio_probe, + .remove = max77620_gpio_remove, + .id_table = max77620_gpio_devtype, +}; + +static int __init max77620_gpio_init(void) +{ + return platform_driver_register(&max77620_gpio_driver); +} +subsys_initcall(max77620_gpio_init); + +static void __exit max77620_gpio_exit(void) +{ + platform_driver_unregister(&max77620_gpio_driver); +} +module_exit(max77620_gpio_exit); + +MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@xxxxxxxxxx>"); +MODULE_AUTHOR("Chaitanya Bandi <bandik@xxxxxxxxxx>"); +MODULE_ALIAS("platform:max77620-gpio"); +MODULE_LICENSE("GPL v2"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html