/* * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ * Andrew F. Davis <afd@ti.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether expressed or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License version 2 for more details. * * Based on the TPS65912 driver */ #include <linux/gpio.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/mfd/tps65086.h> struct tps65086_gpio { struct gpio_chip chip; struct tps65086 *tps; }; static int tps65086_gpio_get_direction(struct gpio_chip *chip, unsigned offset) { /* This device is output only */ return 0; } static int tps65086_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { /* This device is output only */ return -EINVAL; } static int tps65086_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) { struct tps65086_gpio *gpio = gpiochip_get_data(chip); /* Set the initial value */ regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL, BIT(4 + offset), value ? BIT(4 + offset) : 0); return 0; } static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset) { struct tps65086_gpio *gpio = gpiochip_get_data(chip); int ret, val; ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val); if (ret < 0) return ret; return val & BIT(4 + offset); } static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct tps65086_gpio *gpio = gpiochip_get_data(chip); regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL, BIT(4 + offset), value ? BIT(4 + offset) : 0); } static const struct gpio_chip template_chip = { .label = "tps65086-gpio", .owner = THIS_MODULE, .get_direction = tps65086_gpio_get_direction, .direction_input = tps65086_gpio_direction_input, .direction_output = tps65086_gpio_direction_output, .get = tps65086_gpio_get, .set = tps65086_gpio_set, .base = -1, .ngpio = 4, .can_sleep = true, }; static int tps65086_gpio_probe(struct platform_device *pdev) { struct tps65086_gpio *gpio; int ret; gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); if (!gpio) return -ENOMEM; platform_set_drvdata(pdev, gpio); gpio->tps = dev_get_drvdata(pdev->dev.parent); gpio->chip = template_chip; gpio->chip.parent = gpio->tps->dev; ret = gpiochip_add_data(&gpio->chip, gpio); if (ret < 0) { dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); return ret; } return 0; } static int tps65086_gpio_remove(struct platform_device *pdev) { struct tps65086_gpio *gpio = platform_get_drvdata(pdev); gpiochip_remove(&gpio->chip); return 0; } static const struct platform_device_id tps65086_gpio_id_table[] = { { "tps65086-gpio", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table); static struct platform_driver tps65086_gpio_driver = { .driver = { .name = "tps65086-gpio", }, .probe = tps65086_gpio_probe, .remove = tps65086_gpio_remove, .id_table = tps65086_gpio_id_table, }; module_platform_driver(tps65086_gpio_driver); MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); MODULE_DESCRIPTION("TPS65086 GPIO driver"); MODULE_LICENSE("GPL v2");