1c103de24SGrant Likely /* 2c103de24SGrant Likely * gpiolib support for Wolfson WM835x PMICs 3c103de24SGrant Likely * 4c103de24SGrant Likely * Copyright 2009 Wolfson Microelectronics PLC. 5c103de24SGrant Likely * 6c103de24SGrant Likely * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7c103de24SGrant Likely * 8c103de24SGrant Likely * This program is free software; you can redistribute it and/or modify it 9c103de24SGrant Likely * under the terms of the GNU General Public License as published by the 10c103de24SGrant Likely * Free Software Foundation; either version 2 of the License, or (at your 11c103de24SGrant Likely * option) any later version. 12c103de24SGrant Likely * 13c103de24SGrant Likely */ 14c103de24SGrant Likely 15c103de24SGrant Likely #include <linux/kernel.h> 16c103de24SGrant Likely #include <linux/slab.h> 17c103de24SGrant Likely #include <linux/module.h> 18c103de24SGrant Likely #include <linux/gpio.h> 19c103de24SGrant Likely #include <linux/mfd/core.h> 20c103de24SGrant Likely #include <linux/platform_device.h> 21c103de24SGrant Likely #include <linux/seq_file.h> 22c103de24SGrant Likely 23c103de24SGrant Likely #include <linux/mfd/wm8350/core.h> 24c103de24SGrant Likely #include <linux/mfd/wm8350/gpio.h> 25c103de24SGrant Likely 26c103de24SGrant Likely struct wm8350_gpio_data { 27c103de24SGrant Likely struct wm8350 *wm8350; 28c103de24SGrant Likely struct gpio_chip gpio_chip; 29c103de24SGrant Likely }; 30c103de24SGrant Likely 31c103de24SGrant Likely static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 32c103de24SGrant Likely { 33dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 34c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 35c103de24SGrant Likely 36c103de24SGrant Likely return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 37c103de24SGrant Likely 1 << offset); 38c103de24SGrant Likely } 39c103de24SGrant Likely 40c103de24SGrant Likely static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) 41c103de24SGrant Likely { 42dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 43c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 44c103de24SGrant Likely int ret; 45c103de24SGrant Likely 46c103de24SGrant Likely ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); 47c103de24SGrant Likely if (ret < 0) 48c103de24SGrant Likely return ret; 49c103de24SGrant Likely 50c103de24SGrant Likely if (ret & (1 << offset)) 51c103de24SGrant Likely return 1; 52c103de24SGrant Likely else 53c103de24SGrant Likely return 0; 54c103de24SGrant Likely } 55c103de24SGrant Likely 56c103de24SGrant Likely static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 57c103de24SGrant Likely { 58dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 59c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 60c103de24SGrant Likely 61c103de24SGrant Likely if (value) 62c103de24SGrant Likely wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 63c103de24SGrant Likely else 64c103de24SGrant Likely wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 65c103de24SGrant Likely } 66c103de24SGrant Likely 67c103de24SGrant Likely static int wm8350_gpio_direction_out(struct gpio_chip *chip, 68c103de24SGrant Likely unsigned offset, int value) 69c103de24SGrant Likely { 70dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 71c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 72c103de24SGrant Likely int ret; 73c103de24SGrant Likely 74c103de24SGrant Likely ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 75c103de24SGrant Likely 1 << offset); 76c103de24SGrant Likely if (ret < 0) 77c103de24SGrant Likely return ret; 78c103de24SGrant Likely 79c103de24SGrant Likely /* Don't have an atomic direction/value setup */ 80c103de24SGrant Likely wm8350_gpio_set(chip, offset, value); 81c103de24SGrant Likely 82c103de24SGrant Likely return 0; 83c103de24SGrant Likely } 84c103de24SGrant Likely 85c103de24SGrant Likely static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 86c103de24SGrant Likely { 87dfcdf721SLinus Walleij struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 88c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 89c103de24SGrant Likely 90c103de24SGrant Likely if (!wm8350->irq_base) 91c103de24SGrant Likely return -EINVAL; 92c103de24SGrant Likely 93c103de24SGrant Likely return wm8350->irq_base + WM8350_IRQ_GPIO(offset); 94c103de24SGrant Likely } 95c103de24SGrant Likely 96*e35b5ab0SJulia Lawall static const struct gpio_chip template_chip = { 97c103de24SGrant Likely .label = "wm8350", 98c103de24SGrant Likely .owner = THIS_MODULE, 99c103de24SGrant Likely .direction_input = wm8350_gpio_direction_in, 100c103de24SGrant Likely .get = wm8350_gpio_get, 101c103de24SGrant Likely .direction_output = wm8350_gpio_direction_out, 102c103de24SGrant Likely .set = wm8350_gpio_set, 103c103de24SGrant Likely .to_irq = wm8350_gpio_to_irq, 1049fb1f39eSLinus Walleij .can_sleep = true, 105c103de24SGrant Likely }; 106c103de24SGrant Likely 1073836309dSBill Pemberton static int wm8350_gpio_probe(struct platform_device *pdev) 108c103de24SGrant Likely { 109c103de24SGrant Likely struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); 110e56aee18SJingoo Han struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); 111c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio; 112c103de24SGrant Likely int ret; 113c103de24SGrant Likely 1145b425438SAxel Lin wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), 1155b425438SAxel Lin GFP_KERNEL); 116c103de24SGrant Likely if (wm8350_gpio == NULL) 117c103de24SGrant Likely return -ENOMEM; 118c103de24SGrant Likely 119c103de24SGrant Likely wm8350_gpio->wm8350 = wm8350; 120c103de24SGrant Likely wm8350_gpio->gpio_chip = template_chip; 121c103de24SGrant Likely wm8350_gpio->gpio_chip.ngpio = 13; 12258383c78SLinus Walleij wm8350_gpio->gpio_chip.parent = &pdev->dev; 123c103de24SGrant Likely if (pdata && pdata->gpio_base) 124c103de24SGrant Likely wm8350_gpio->gpio_chip.base = pdata->gpio_base; 125c103de24SGrant Likely else 126c103de24SGrant Likely wm8350_gpio->gpio_chip.base = -1; 127c103de24SGrant Likely 1284a4925cfSLaxman Dewangan ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, 1294a4925cfSLaxman Dewangan wm8350_gpio); 130c103de24SGrant Likely if (ret < 0) { 1315b425438SAxel Lin dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 1325b425438SAxel Lin return ret; 133c103de24SGrant Likely } 134c103de24SGrant Likely 135c103de24SGrant Likely platform_set_drvdata(pdev, wm8350_gpio); 136c103de24SGrant Likely 137c103de24SGrant Likely return ret; 138c103de24SGrant Likely } 139c103de24SGrant Likely 140c103de24SGrant Likely static struct platform_driver wm8350_gpio_driver = { 141c103de24SGrant Likely .driver.name = "wm8350-gpio", 142c103de24SGrant Likely .probe = wm8350_gpio_probe, 143c103de24SGrant Likely }; 144c103de24SGrant Likely 145c103de24SGrant Likely static int __init wm8350_gpio_init(void) 146c103de24SGrant Likely { 147c103de24SGrant Likely return platform_driver_register(&wm8350_gpio_driver); 148c103de24SGrant Likely } 149c103de24SGrant Likely subsys_initcall(wm8350_gpio_init); 150c103de24SGrant Likely 151c103de24SGrant Likely static void __exit wm8350_gpio_exit(void) 152c103de24SGrant Likely { 153c103de24SGrant Likely platform_driver_unregister(&wm8350_gpio_driver); 154c103de24SGrant Likely } 155c103de24SGrant Likely module_exit(wm8350_gpio_exit); 156c103de24SGrant Likely 157c103de24SGrant Likely MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 158c103de24SGrant Likely MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); 159c103de24SGrant Likely MODULE_LICENSE("GPL"); 160c103de24SGrant Likely MODULE_ALIAS("platform:wm8350-gpio"); 161