// SPDX-License-Identifier: GPL-2.0-or-later /* * GPIO Driver for Dialog DA9055 PMICs. * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen <dchen@diasemi.com> */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/gpio/driver.h> #include <linux/mfd/da9055/core.h> #include <linux/mfd/da9055/reg.h> #include <linux/mfd/da9055/pdata.h> #define DA9055_VDD_IO 0x0 #define DA9055_PUSH_PULL 0x3 #define DA9055_ACT_LOW 0x0 #define DA9055_GPI 0x1 #define DA9055_PORT_MASK 0x3 #define DA9055_PORT_SHIFT(offset) (4 * (offset % 2)) #define DA9055_INPUT DA9055_GPI #define DA9055_OUTPUT DA9055_PUSH_PULL #define DA9055_IRQ_GPI0 3 struct da9055_gpio { struct da9055 *da9055; struct gpio_chip gp; }; static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset) { struct da9055_gpio *gpio = gpiochip_get_data(gc); int gpio_direction = 0; int ret; /* Get GPIO direction */ ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1); if (ret < 0) return ret; gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset); gpio_direction >>= DA9055_PORT_SHIFT(offset); switch (gpio_direction) { case DA9055_INPUT: ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B); if (ret < 0) return ret; break; case DA9055_OUTPUT: ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2); if (ret < 0) return ret; } return ret & (1 << offset); } static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value) { struct da9055_gpio *gpio = gpiochip_get_data(gc); da9055_reg_update(gpio->da9055, DA9055_REG_GPIO_MODE0_2, 1 << offset, value << offset); } static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset) { struct da9055_gpio *gpio = gpiochip_get_data(gc); unsigned char reg_byte; reg_byte = (DA9055_ACT_LOW | DA9055_GPI) << DA9055_PORT_SHIFT(offset); return da9055_reg_update(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1, DA9055_PORT_MASK << DA9055_PORT_SHIFT(offset), reg_byte); } static int da9055_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int value) { struct da9055_gpio *gpio = gpiochip_get_data(gc); unsigned char reg_byte; int ret; reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL) << DA9055_PORT_SHIFT(offset); ret = da9055_reg_update(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1, DA9055_PORT_MASK << DA9055_PORT_SHIFT(offset), reg_byte); if (ret < 0) return ret; da9055_gpio_set(gc, offset, value); return 0; } static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset) { struct da9055_gpio *gpio = gpiochip_get_data(gc); struct da9055 *da9055 = gpio->da9055; return regmap_irq_get_virq(da9055->irq_data, DA9055_IRQ_GPI0 + offset); } static const struct gpio_chip reference_gp = { .label = "da9055-gpio", .owner = THIS_MODULE, .get = da9055_gpio_get, .set = da9055_gpio_set, .direction_input = da9055_gpio_direction_input, .direction_output = da9055_gpio_direction_output, .to_irq = da9055_gpio_to_irq, .can_sleep = true, .ngpio = 3, .base = -1, }; static int da9055_gpio_probe(struct platform_device *pdev) { struct da9055_gpio *gpio; struct da9055_pdata *pdata; gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); if (!gpio) return -ENOMEM; gpio->da9055 = dev_get_drvdata(pdev->dev.parent); pdata = dev_get_platdata(gpio->da9055->dev); gpio->gp = reference_gp; if (pdata && pdata->gpio_base) gpio->gp.base = pdata->gpio_base; return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); } static struct platform_driver da9055_gpio_driver = { .probe = da9055_gpio_probe, .driver = { .name = "da9055-gpio", }, }; static int __init da9055_gpio_init(void) { return platform_driver_register(&da9055_gpio_driver); } subsys_initcall(da9055_gpio_init); static void __exit da9055_gpio_exit(void) { platform_driver_unregister(&da9055_gpio_driver); } module_exit(da9055_gpio_exit); MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); MODULE_DESCRIPTION("DA9055 GPIO Device Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9055-gpio");