/* * GPIO driver for TI TPS65912x PMICs * * 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 Arizona GPIO driver and the previous TPS65912 driver by * Margarita Olaya Cabrera <magi@slimlogic.co.uk> */ #include <linux/gpio.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/mfd/tps65912.h> struct tps65912_gpio { struct gpio_chip gpio_chip; struct tps65912 *tps; }; static int tps65912_gpio_get_direction(struct gpio_chip *gc, unsigned offset) { struct tps65912_gpio *gpio = gpiochip_get_data(gc); int ret, val; ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val); if (ret) return ret; if (val & GPIO_CFG_MASK) return GPIOF_DIR_OUT; else return GPIOF_DIR_IN; } static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset) { struct tps65912_gpio *gpio = gpiochip_get_data(gc); return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset, GPIO_CFG_MASK, 0); } static int tps65912_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int value) { struct tps65912_gpio *gpio = gpiochip_get_data(gc); /* Set the initial value */ regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset, GPIO_SET_MASK, value ? GPIO_SET_MASK : 0); return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset, GPIO_CFG_MASK, GPIO_CFG_MASK); } static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset) { struct tps65912_gpio *gpio = gpiochip_get_data(gc); int ret, val; ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val); if (ret) return ret; if (val & GPIO_STS_MASK) return 1; return 0; } static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset, int value) { struct tps65912_gpio *gpio = gpiochip_get_data(gc); regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset, GPIO_SET_MASK, value ? GPIO_SET_MASK : 0); } static const struct gpio_chip template_chip = { .label = "tps65912-gpio", .owner = THIS_MODULE, .get_direction = tps65912_gpio_get_direction, .direction_input = tps65912_gpio_direction_input, .direction_output = tps65912_gpio_direction_output, .get = tps65912_gpio_get, .set = tps65912_gpio_set, .base = -1, .ngpio = 5, .can_sleep = true, }; static int tps65912_gpio_probe(struct platform_device *pdev) { struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent); struct tps65912_gpio *gpio; int ret; gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); if (!gpio) return -ENOMEM; gpio->tps = dev_get_drvdata(pdev->dev.parent); gpio->gpio_chip = template_chip; gpio->gpio_chip.parent = tps->dev; ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio); if (ret < 0) { dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); return ret; } platform_set_drvdata(pdev, gpio); return 0; } static const struct platform_device_id tps65912_gpio_id_table[] = { { "tps65912-gpio", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table); static struct platform_driver tps65912_gpio_driver = { .driver = { .name = "tps65912-gpio", }, .probe = tps65912_gpio_probe, .id_table = tps65912_gpio_id_table, }; module_platform_driver(tps65912_gpio_driver); MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); MODULE_DESCRIPTION("TPS65912 GPIO driver"); MODULE_LICENSE("GPL v2");