/* * wm835x-gpiolib.c -- gpiolib support for Wolfson WM835x PMICs * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/gpio.h> #include <linux/mfd/core.h> #include <linux/platform_device.h> #include <linux/seq_file.h> #include <linux/mfd/wm8350/core.h> #include <linux/mfd/wm8350/gpio.h> struct wm8350_gpio_data { struct wm8350 *wm8350; struct gpio_chip gpio_chip; }; static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip) { return container_of(chip, struct wm8350_gpio_data, gpio_chip); } static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) { struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); struct wm8350 *wm8350 = wm8350_gpio->wm8350; return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 1 << offset); } static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) { struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); struct wm8350 *wm8350 = wm8350_gpio->wm8350; int ret; ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); if (ret < 0) return ret; if (ret & (1 << offset)) return 1; else return 0; } static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); struct wm8350 *wm8350 = wm8350_gpio->wm8350; if (value) wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); else wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); } static int wm8350_gpio_direction_out(struct gpio_chip *chip, unsigned offset, int value) { struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); struct wm8350 *wm8350 = wm8350_gpio->wm8350; int ret; ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 1 << offset); if (ret < 0) return ret; /* Don't have an atomic direction/value setup */ wm8350_gpio_set(chip, offset, value); return 0; } static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) { struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); struct wm8350 *wm8350 = wm8350_gpio->wm8350; if (!wm8350->irq_base) return -EINVAL; return wm8350->irq_base + WM8350_IRQ_GPIO(offset); } static struct gpio_chip template_chip = { .label = "wm8350", .owner = THIS_MODULE, .direction_input = wm8350_gpio_direction_in, .get = wm8350_gpio_get, .direction_output = wm8350_gpio_direction_out, .set = wm8350_gpio_set, .to_irq = wm8350_gpio_to_irq, .can_sleep = 1, }; static int __devinit wm8350_gpio_probe(struct platform_device *pdev) { struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); struct wm8350_platform_data *pdata = wm8350->dev->platform_data; struct wm8350_gpio_data *wm8350_gpio; int ret; wm8350_gpio = kzalloc(sizeof(*wm8350_gpio), GFP_KERNEL); if (wm8350_gpio == NULL) return -ENOMEM; wm8350_gpio->wm8350 = wm8350; wm8350_gpio->gpio_chip = template_chip; wm8350_gpio->gpio_chip.ngpio = 13; wm8350_gpio->gpio_chip.dev = &pdev->dev; if (pdata && pdata->gpio_base) wm8350_gpio->gpio_chip.base = pdata->gpio_base; else wm8350_gpio->gpio_chip.base = -1; ret = gpiochip_add(&wm8350_gpio->gpio_chip); if (ret < 0) { dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); goto err; } platform_set_drvdata(pdev, wm8350_gpio); return ret; err: kfree(wm8350_gpio); return ret; } static int __devexit wm8350_gpio_remove(struct platform_device *pdev) { struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev); int ret; ret = gpiochip_remove(&wm8350_gpio->gpio_chip); if (ret == 0) kfree(wm8350_gpio); return ret; } static struct platform_driver wm8350_gpio_driver = { .driver.name = "wm8350-gpio", .driver.owner = THIS_MODULE, .probe = wm8350_gpio_probe, .remove = __devexit_p(wm8350_gpio_remove), }; static int __init wm8350_gpio_init(void) { return platform_driver_register(&wm8350_gpio_driver); } subsys_initcall(wm8350_gpio_init); static void __exit wm8350_gpio_exit(void) { platform_driver_unregister(&wm8350_gpio_driver); } module_exit(wm8350_gpio_exit); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm8350-gpio");