1*66dbe750SLinus 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 11c103de24SGrant Likely #include <linux/kernel.h> 12c103de24SGrant Likely #include <linux/slab.h> 13c103de24SGrant Likely #include <linux/module.h> 1410833c4bSLinus Walleij #include <linux/gpio/driver.h> 15c103de24SGrant Likely #include <linux/mfd/core.h> 16c103de24SGrant Likely #include <linux/platform_device.h> 17c103de24SGrant Likely #include <linux/seq_file.h> 18c103de24SGrant Likely 19c103de24SGrant Likely #include <linux/mfd/wm8350/core.h> 20c103de24SGrant Likely #include <linux/mfd/wm8350/gpio.h> 21c103de24SGrant Likely 22c103de24SGrant Likely struct wm8350_gpio_data { 23c103de24SGrant Likely struct wm8350 *wm8350; 24c103de24SGrant Likely struct gpio_chip gpio_chip; 25c103de24SGrant Likely }; 26c103de24SGrant Likely 27c103de24SGrant Likely static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 28c103de24SGrant Likely { 29dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 30c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 31c103de24SGrant Likely 32c103de24SGrant Likely return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 33c103de24SGrant Likely 1 << offset); 34c103de24SGrant Likely } 35c103de24SGrant Likely 36c103de24SGrant Likely static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) 37c103de24SGrant Likely { 38dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 39c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 40c103de24SGrant Likely int ret; 41c103de24SGrant Likely 42c103de24SGrant Likely ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); 43c103de24SGrant Likely if (ret < 0) 44c103de24SGrant Likely return ret; 45c103de24SGrant Likely 46c103de24SGrant Likely if (ret & (1 << offset)) 47c103de24SGrant Likely return 1; 48c103de24SGrant Likely else 49c103de24SGrant Likely return 0; 50c103de24SGrant Likely } 51c103de24SGrant Likely 52c103de24SGrant Likely static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 53c103de24SGrant Likely { 54dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 55c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 56c103de24SGrant Likely 57c103de24SGrant Likely if (value) 58c103de24SGrant Likely wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 59c103de24SGrant Likely else 60c103de24SGrant Likely wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 61c103de24SGrant Likely } 62c103de24SGrant Likely 63c103de24SGrant Likely static int wm8350_gpio_direction_out(struct gpio_chip *chip, 64c103de24SGrant Likely unsigned offset, int value) 65c103de24SGrant Likely { 66dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 67c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 68c103de24SGrant Likely int ret; 69c103de24SGrant Likely 70c103de24SGrant Likely ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 71c103de24SGrant Likely 1 << offset); 72c103de24SGrant Likely if (ret < 0) 73c103de24SGrant Likely return ret; 74c103de24SGrant Likely 75c103de24SGrant Likely /* Don't have an atomic direction/value setup */ 76c103de24SGrant Likely wm8350_gpio_set(chip, offset, value); 77c103de24SGrant Likely 78c103de24SGrant Likely return 0; 79c103de24SGrant Likely } 80c103de24SGrant Likely 81c103de24SGrant Likely static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 82c103de24SGrant Likely { 83dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 84c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 85c103de24SGrant Likely 86c103de24SGrant Likely if (!wm8350->irq_base) 87c103de24SGrant Likely return -EINVAL; 88c103de24SGrant Likely 89c103de24SGrant Likely return wm8350->irq_base + WM8350_IRQ_GPIO(offset); 90c103de24SGrant Likely } 91c103de24SGrant Likely 92e35b5ab0SJulia Lawall static const struct gpio_chip template_chip = { 93c103de24SGrant Likely .label = "wm8350", 94c103de24SGrant Likely .owner = THIS_MODULE, 95c103de24SGrant Likely .direction_input = wm8350_gpio_direction_in, 96c103de24SGrant Likely .get = wm8350_gpio_get, 97c103de24SGrant Likely .direction_output = wm8350_gpio_direction_out, 98c103de24SGrant Likely .set = wm8350_gpio_set, 99c103de24SGrant Likely .to_irq = wm8350_gpio_to_irq, 1009fb1f39eSLinus Walleij .can_sleep = true, 101c103de24SGrant Likely }; 102c103de24SGrant Likely 1033836309dSBill Pemberton static int wm8350_gpio_probe(struct platform_device *pdev) 104c103de24SGrant Likely { 105c103de24SGrant Likely struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); 106e56aee18SJingoo Han struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); 107c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio; 108c103de24SGrant Likely int ret; 109c103de24SGrant Likely 1105b425438SAxel Lin wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), 1115b425438SAxel Lin GFP_KERNEL); 112c103de24SGrant Likely if (wm8350_gpio == NULL) 113c103de24SGrant Likely return -ENOMEM; 114c103de24SGrant Likely 115c103de24SGrant Likely wm8350_gpio->wm8350 = wm8350; 116c103de24SGrant Likely wm8350_gpio->gpio_chip = template_chip; 117c103de24SGrant Likely wm8350_gpio->gpio_chip.ngpio = 13; 11858383c78SLinus Walleij wm8350_gpio->gpio_chip.parent = &pdev->dev; 119c103de24SGrant Likely if (pdata && pdata->gpio_base) 120c103de24SGrant Likely wm8350_gpio->gpio_chip.base = pdata->gpio_base; 121c103de24SGrant Likely else 122c103de24SGrant Likely wm8350_gpio->gpio_chip.base = -1; 123c103de24SGrant Likely 1244a4925cfSLaxman Dewangan ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, 1254a4925cfSLaxman Dewangan wm8350_gpio); 126c103de24SGrant Likely if (ret < 0) { 1275b425438SAxel Lin dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 1285b425438SAxel Lin return ret; 129c103de24SGrant Likely } 130c103de24SGrant Likely 131c103de24SGrant Likely platform_set_drvdata(pdev, wm8350_gpio); 132c103de24SGrant Likely 133c103de24SGrant Likely return ret; 134c103de24SGrant Likely } 135c103de24SGrant Likely 136c103de24SGrant Likely static struct platform_driver wm8350_gpio_driver = { 137c103de24SGrant Likely .driver.name = "wm8350-gpio", 138c103de24SGrant Likely .probe = wm8350_gpio_probe, 139c103de24SGrant Likely }; 140c103de24SGrant Likely 141c103de24SGrant Likely static int __init wm8350_gpio_init(void) 142c103de24SGrant Likely { 143c103de24SGrant Likely return platform_driver_register(&wm8350_gpio_driver); 144c103de24SGrant Likely } 145c103de24SGrant Likely subsys_initcall(wm8350_gpio_init); 146c103de24SGrant Likely 147c103de24SGrant Likely static void __exit wm8350_gpio_exit(void) 148c103de24SGrant Likely { 149c103de24SGrant Likely platform_driver_unregister(&wm8350_gpio_driver); 150c103de24SGrant Likely } 151c103de24SGrant Likely module_exit(wm8350_gpio_exit); 152c103de24SGrant Likely 153c103de24SGrant Likely MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 154c103de24SGrant Likely MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); 155c103de24SGrant Likely MODULE_LICENSE("GPL"); 156c103de24SGrant Likely MODULE_ALIAS("platform:wm8350-gpio"); 157