// SPDX-License-Identifier: GPL-2.0-only /* * GPIO support for Cirrus Logic Madera codecs * * Copyright (C) 2015-2018 Cirrus Logic */ #include <linux/gpio/driver.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/mfd/madera/core.h> #include <linux/mfd/madera/pdata.h> #include <linux/mfd/madera/registers.h> struct madera_gpio { struct madera *madera; /* storage space for the gpio_chip we're using */ struct gpio_chip gpio_chip; }; static int madera_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { struct madera_gpio *madera_gpio = gpiochip_get_data(chip); struct madera *madera = madera_gpio->madera; unsigned int reg_offset = 2 * offset; unsigned int val; int ret; ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset, &val); if (ret < 0) return ret; return !!(val & MADERA_GP1_DIR_MASK); } static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset) { struct madera_gpio *madera_gpio = gpiochip_get_data(chip); struct madera *madera = madera_gpio->madera; unsigned int reg_offset = 2 * offset; return regmap_update_bits(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset, MADERA_GP1_DIR_MASK, MADERA_GP1_DIR); } static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset) { struct madera_gpio *madera_gpio = gpiochip_get_data(chip); struct madera *madera = madera_gpio->madera; unsigned int reg_offset = 2 * offset; unsigned int val; int ret; ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset, &val); if (ret < 0) return ret; return !!(val & MADERA_GP1_LVL_MASK); } static int madera_gpio_direction_out(struct gpio_chip *chip, unsigned int offset, int value) { struct madera_gpio *madera_gpio = gpiochip_get_data(chip); struct madera *madera = madera_gpio->madera; unsigned int reg_offset = 2 * offset; unsigned int reg_val = value ? MADERA_GP1_LVL : 0; int ret; ret = regmap_update_bits(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset, MADERA_GP1_DIR_MASK, 0); if (ret < 0) return ret; return regmap_update_bits(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset, MADERA_GP1_LVL_MASK, reg_val); } static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct madera_gpio *madera_gpio = gpiochip_get_data(chip); struct madera *madera = madera_gpio->madera; unsigned int reg_offset = 2 * offset; unsigned int reg_val = value ? MADERA_GP1_LVL : 0; int ret; ret = regmap_update_bits(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset, MADERA_GP1_LVL_MASK, reg_val); /* set() doesn't return an error so log a warning */ if (ret) dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n", MADERA_GPIO1_CTRL_1 + reg_offset, ret); } static const struct gpio_chip madera_gpio_chip = { .label = "madera", .owner = THIS_MODULE, .request = gpiochip_generic_request, .free = gpiochip_generic_free, .get_direction = madera_gpio_get_direction, .direction_input = madera_gpio_direction_in, .get = madera_gpio_get, .direction_output = madera_gpio_direction_out, .set = madera_gpio_set, .set_config = gpiochip_generic_config, .can_sleep = true, }; static int madera_gpio_probe(struct platform_device *pdev) { struct madera *madera = dev_get_drvdata(pdev->dev.parent); struct madera_pdata *pdata = dev_get_platdata(madera->dev); struct madera_gpio *madera_gpio; int ret; madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio), GFP_KERNEL); if (!madera_gpio) return -ENOMEM; madera_gpio->madera = madera; /* Construct suitable gpio_chip from the template in madera_gpio_chip */ madera_gpio->gpio_chip = madera_gpio_chip; madera_gpio->gpio_chip.parent = pdev->dev.parent; switch (madera->type) { case CS47L35: madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS; break; case CS47L85: case WM1840: madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS; break; case CS47L90: case CS47L91: madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS; break; default: dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type); return -EINVAL; } /* We want to be usable on systems that don't use devicetree or acpi */ if (pdata && pdata->gpio_base) madera_gpio->gpio_chip.base = pdata->gpio_base; else madera_gpio->gpio_chip.base = -1; ret = devm_gpiochip_add_data(&pdev->dev, &madera_gpio->gpio_chip, madera_gpio); if (ret < 0) { dev_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret); return ret; } /* * This is part of a composite MFD device which can only be used with * the corresponding pinctrl driver. On all supported silicon the GPIO * to pinctrl mapping is fixed in the silicon, so we register it * explicitly instead of requiring a redundant gpio-ranges in the * devicetree. * In any case we also want to work on systems that don't use devicetree * or acpi. */ ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl", 0, 0, madera_gpio->gpio_chip.ngpio); if (ret) { dev_dbg(&pdev->dev, "Failed to add pin range (%d)\n", ret); return ret; } return 0; } static struct platform_driver madera_gpio_driver = { .driver = { .name = "madera-gpio", }, .probe = madera_gpio_probe, }; module_platform_driver(madera_gpio_driver); MODULE_SOFTDEP("pre: pinctrl-madera"); MODULE_DESCRIPTION("GPIO interface for Madera codecs"); MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>"); MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:madera-gpio");