166dbe750SLinus Walleij // SPDX-License-Identifier: GPL-2.0+ 2c103de24SGrant Likely /* 3c103de24SGrant Likely * gpiolib support for Wolfson WM835x PMICs 4c103de24SGrant Likely * 5c103de24SGrant Likely * Copyright 2009 Wolfson Microelectronics PLC. 6c103de24SGrant Likely * 7c103de24SGrant Likely * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8c103de24SGrant Likely * 9c103de24SGrant Likely */ 10c103de24SGrant Likely 1110833c4bSLinus Walleij #include <linux/gpio/driver.h> 12*275d1356SAndy Shevchenko #include <linux/kernel.h> 13c103de24SGrant Likely #include <linux/mfd/core.h> 14*275d1356SAndy Shevchenko #include <linux/module.h> 15c103de24SGrant Likely #include <linux/platform_device.h> 16*275d1356SAndy Shevchenko #include <linux/slab.h> 17c103de24SGrant Likely 18c103de24SGrant Likely #include <linux/mfd/wm8350/core.h> 19c103de24SGrant Likely #include <linux/mfd/wm8350/gpio.h> 20c103de24SGrant Likely 21c103de24SGrant Likely struct wm8350_gpio_data { 22c103de24SGrant Likely struct wm8350 *wm8350; 23c103de24SGrant Likely struct gpio_chip gpio_chip; 24c103de24SGrant Likely }; 25c103de24SGrant Likely 26c103de24SGrant Likely static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 27c103de24SGrant Likely { 28dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 29c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 30c103de24SGrant Likely 31c103de24SGrant Likely return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 32c103de24SGrant Likely 1 << offset); 33c103de24SGrant Likely } 34c103de24SGrant Likely 35c103de24SGrant Likely static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) 36c103de24SGrant Likely { 37dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 38c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 39c103de24SGrant Likely int ret; 40c103de24SGrant Likely 41c103de24SGrant Likely ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); 42c103de24SGrant Likely if (ret < 0) 43c103de24SGrant Likely return ret; 44c103de24SGrant Likely 45c103de24SGrant Likely if (ret & (1 << offset)) 46c103de24SGrant Likely return 1; 47c103de24SGrant Likely else 48c103de24SGrant Likely return 0; 49c103de24SGrant Likely } 50c103de24SGrant Likely 51c103de24SGrant Likely static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 52c103de24SGrant Likely { 53dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 54c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 55c103de24SGrant Likely 56c103de24SGrant Likely if (value) 57c103de24SGrant Likely wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 58c103de24SGrant Likely else 59c103de24SGrant Likely wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 60c103de24SGrant Likely } 61c103de24SGrant Likely 62c103de24SGrant Likely static int wm8350_gpio_direction_out(struct gpio_chip *chip, 63c103de24SGrant Likely unsigned offset, int value) 64c103de24SGrant Likely { 65dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 66c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 67c103de24SGrant Likely int ret; 68c103de24SGrant Likely 69c103de24SGrant Likely ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 70c103de24SGrant Likely 1 << offset); 71c103de24SGrant Likely if (ret < 0) 72c103de24SGrant Likely return ret; 73c103de24SGrant Likely 74c103de24SGrant Likely /* Don't have an atomic direction/value setup */ 75c103de24SGrant Likely wm8350_gpio_set(chip, offset, value); 76c103de24SGrant Likely 77c103de24SGrant Likely return 0; 78c103de24SGrant Likely } 79c103de24SGrant Likely 80c103de24SGrant Likely static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 81c103de24SGrant Likely { 82dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 83c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 84c103de24SGrant Likely 85c103de24SGrant Likely if (!wm8350->irq_base) 86c103de24SGrant Likely return -EINVAL; 87c103de24SGrant Likely 88c103de24SGrant Likely return wm8350->irq_base + WM8350_IRQ_GPIO(offset); 89c103de24SGrant Likely } 90c103de24SGrant Likely 91e35b5ab0SJulia Lawall static const struct gpio_chip template_chip = { 92c103de24SGrant Likely .label = "wm8350", 93c103de24SGrant Likely .owner = THIS_MODULE, 94c103de24SGrant Likely .direction_input = wm8350_gpio_direction_in, 95c103de24SGrant Likely .get = wm8350_gpio_get, 96c103de24SGrant Likely .direction_output = wm8350_gpio_direction_out, 97c103de24SGrant Likely .set = wm8350_gpio_set, 98c103de24SGrant Likely .to_irq = wm8350_gpio_to_irq, 999fb1f39eSLinus Walleij .can_sleep = true, 100c103de24SGrant Likely }; 101c103de24SGrant Likely 1023836309dSBill Pemberton static int wm8350_gpio_probe(struct platform_device *pdev) 103c103de24SGrant Likely { 104c103de24SGrant Likely struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); 105e56aee18SJingoo Han struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); 106c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio; 107c103de24SGrant Likely 1085b425438SAxel Lin wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), 1095b425438SAxel Lin GFP_KERNEL); 110c103de24SGrant Likely if (wm8350_gpio == NULL) 111c103de24SGrant Likely return -ENOMEM; 112c103de24SGrant Likely 113c103de24SGrant Likely wm8350_gpio->wm8350 = wm8350; 114c103de24SGrant Likely wm8350_gpio->gpio_chip = template_chip; 115c103de24SGrant Likely wm8350_gpio->gpio_chip.ngpio = 13; 11658383c78SLinus Walleij wm8350_gpio->gpio_chip.parent = &pdev->dev; 117c103de24SGrant Likely if (pdata && pdata->gpio_base) 118c103de24SGrant Likely wm8350_gpio->gpio_chip.base = pdata->gpio_base; 119c103de24SGrant Likely else 120c103de24SGrant Likely wm8350_gpio->gpio_chip.base = -1; 121c103de24SGrant Likely 12205332606SAlexandru Ardelean return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio); 123c103de24SGrant Likely } 124c103de24SGrant Likely 125c103de24SGrant Likely static struct platform_driver wm8350_gpio_driver = { 126c103de24SGrant Likely .driver.name = "wm8350-gpio", 127c103de24SGrant Likely .probe = wm8350_gpio_probe, 128c103de24SGrant Likely }; 129c103de24SGrant Likely 130c103de24SGrant Likely static int __init wm8350_gpio_init(void) 131c103de24SGrant Likely { 132c103de24SGrant Likely return platform_driver_register(&wm8350_gpio_driver); 133c103de24SGrant Likely } 134c103de24SGrant Likely subsys_initcall(wm8350_gpio_init); 135c103de24SGrant Likely 136c103de24SGrant Likely static void __exit wm8350_gpio_exit(void) 137c103de24SGrant Likely { 138c103de24SGrant Likely platform_driver_unregister(&wm8350_gpio_driver); 139c103de24SGrant Likely } 140c103de24SGrant Likely module_exit(wm8350_gpio_exit); 141c103de24SGrant Likely 142c103de24SGrant Likely MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 143c103de24SGrant Likely MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); 144c103de24SGrant Likely MODULE_LICENSE("GPL"); 145c103de24SGrant Likely MODULE_ALIAS("platform:wm8350-gpio"); 146