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 inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip) 32c103de24SGrant Likely { 33c103de24SGrant Likely return container_of(chip, struct wm8350_gpio_data, gpio_chip); 34c103de24SGrant Likely } 35c103de24SGrant Likely 36c103de24SGrant Likely static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 37c103de24SGrant Likely { 38c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 39c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 40c103de24SGrant Likely 41c103de24SGrant Likely return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 42c103de24SGrant Likely 1 << offset); 43c103de24SGrant Likely } 44c103de24SGrant Likely 45c103de24SGrant Likely static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) 46c103de24SGrant Likely { 47c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 48c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 49c103de24SGrant Likely int ret; 50c103de24SGrant Likely 51c103de24SGrant Likely ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); 52c103de24SGrant Likely if (ret < 0) 53c103de24SGrant Likely return ret; 54c103de24SGrant Likely 55c103de24SGrant Likely if (ret & (1 << offset)) 56c103de24SGrant Likely return 1; 57c103de24SGrant Likely else 58c103de24SGrant Likely return 0; 59c103de24SGrant Likely } 60c103de24SGrant Likely 61c103de24SGrant Likely static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 62c103de24SGrant Likely { 63c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 64c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 65c103de24SGrant Likely 66c103de24SGrant Likely if (value) 67c103de24SGrant Likely wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 68c103de24SGrant Likely else 69c103de24SGrant Likely wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 70c103de24SGrant Likely } 71c103de24SGrant Likely 72c103de24SGrant Likely static int wm8350_gpio_direction_out(struct gpio_chip *chip, 73c103de24SGrant Likely unsigned offset, int value) 74c103de24SGrant Likely { 75c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 76c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 77c103de24SGrant Likely int ret; 78c103de24SGrant Likely 79c103de24SGrant Likely ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 80c103de24SGrant Likely 1 << offset); 81c103de24SGrant Likely if (ret < 0) 82c103de24SGrant Likely return ret; 83c103de24SGrant Likely 84c103de24SGrant Likely /* Don't have an atomic direction/value setup */ 85c103de24SGrant Likely wm8350_gpio_set(chip, offset, value); 86c103de24SGrant Likely 87c103de24SGrant Likely return 0; 88c103de24SGrant Likely } 89c103de24SGrant Likely 90c103de24SGrant Likely static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 91c103de24SGrant Likely { 92c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 93c103de24SGrant Likely struct wm8350 *wm8350 = wm8350_gpio->wm8350; 94c103de24SGrant Likely 95c103de24SGrant Likely if (!wm8350->irq_base) 96c103de24SGrant Likely return -EINVAL; 97c103de24SGrant Likely 98c103de24SGrant Likely return wm8350->irq_base + WM8350_IRQ_GPIO(offset); 99c103de24SGrant Likely } 100c103de24SGrant Likely 101c103de24SGrant Likely static struct gpio_chip template_chip = { 102c103de24SGrant Likely .label = "wm8350", 103c103de24SGrant Likely .owner = THIS_MODULE, 104c103de24SGrant Likely .direction_input = wm8350_gpio_direction_in, 105c103de24SGrant Likely .get = wm8350_gpio_get, 106c103de24SGrant Likely .direction_output = wm8350_gpio_direction_out, 107c103de24SGrant Likely .set = wm8350_gpio_set, 108c103de24SGrant Likely .to_irq = wm8350_gpio_to_irq, 109c103de24SGrant Likely .can_sleep = 1, 110c103de24SGrant Likely }; 111c103de24SGrant Likely 112c103de24SGrant Likely static int __devinit wm8350_gpio_probe(struct platform_device *pdev) 113c103de24SGrant Likely { 114c103de24SGrant Likely struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); 115c103de24SGrant Likely struct wm8350_platform_data *pdata = wm8350->dev->platform_data; 116c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio; 117c103de24SGrant Likely int ret; 118c103de24SGrant Likely 119*5b425438SAxel Lin wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), 120*5b425438SAxel Lin GFP_KERNEL); 121c103de24SGrant Likely if (wm8350_gpio == NULL) 122c103de24SGrant Likely return -ENOMEM; 123c103de24SGrant Likely 124c103de24SGrant Likely wm8350_gpio->wm8350 = wm8350; 125c103de24SGrant Likely wm8350_gpio->gpio_chip = template_chip; 126c103de24SGrant Likely wm8350_gpio->gpio_chip.ngpio = 13; 127c103de24SGrant Likely wm8350_gpio->gpio_chip.dev = &pdev->dev; 128c103de24SGrant Likely if (pdata && pdata->gpio_base) 129c103de24SGrant Likely wm8350_gpio->gpio_chip.base = pdata->gpio_base; 130c103de24SGrant Likely else 131c103de24SGrant Likely wm8350_gpio->gpio_chip.base = -1; 132c103de24SGrant Likely 133c103de24SGrant Likely ret = gpiochip_add(&wm8350_gpio->gpio_chip); 134c103de24SGrant Likely if (ret < 0) { 135*5b425438SAxel Lin dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 136*5b425438SAxel Lin return ret; 137c103de24SGrant Likely } 138c103de24SGrant Likely 139c103de24SGrant Likely platform_set_drvdata(pdev, wm8350_gpio); 140c103de24SGrant Likely 141c103de24SGrant Likely return ret; 142c103de24SGrant Likely } 143c103de24SGrant Likely 144c103de24SGrant Likely static int __devexit wm8350_gpio_remove(struct platform_device *pdev) 145c103de24SGrant Likely { 146c103de24SGrant Likely struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev); 147c103de24SGrant Likely 148*5b425438SAxel Lin return gpiochip_remove(&wm8350_gpio->gpio_chip); 149c103de24SGrant Likely } 150c103de24SGrant Likely 151c103de24SGrant Likely static struct platform_driver wm8350_gpio_driver = { 152c103de24SGrant Likely .driver.name = "wm8350-gpio", 153c103de24SGrant Likely .driver.owner = THIS_MODULE, 154c103de24SGrant Likely .probe = wm8350_gpio_probe, 155c103de24SGrant Likely .remove = __devexit_p(wm8350_gpio_remove), 156c103de24SGrant Likely }; 157c103de24SGrant Likely 158c103de24SGrant Likely static int __init wm8350_gpio_init(void) 159c103de24SGrant Likely { 160c103de24SGrant Likely return platform_driver_register(&wm8350_gpio_driver); 161c103de24SGrant Likely } 162c103de24SGrant Likely subsys_initcall(wm8350_gpio_init); 163c103de24SGrant Likely 164c103de24SGrant Likely static void __exit wm8350_gpio_exit(void) 165c103de24SGrant Likely { 166c103de24SGrant Likely platform_driver_unregister(&wm8350_gpio_driver); 167c103de24SGrant Likely } 168c103de24SGrant Likely module_exit(wm8350_gpio_exit); 169c103de24SGrant Likely 170c103de24SGrant Likely MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 171c103de24SGrant Likely MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); 172c103de24SGrant Likely MODULE_LICENSE("GPL"); 173c103de24SGrant Likely MODULE_ALIAS("platform:wm8350-gpio"); 174