/* * TI Palma series PMIC's GPIO driver. * * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. * * Author: Laxman Dewangan <ldewangan@nvidia.com> * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/gpio/driver.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/mfd/palmas.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> struct palmas_gpio { struct gpio_chip gpio_chip; struct palmas *palmas; }; struct palmas_device_data { int ngpio; }; static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; unsigned int val; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); if (ret < 0) { dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret); return ret; } if (val & BIT(offset)) reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT; else reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN; ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); if (ret < 0) { dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret); return ret; } return !!(val & BIT(offset)); } static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset, int value) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; if (gpio16) reg = (value) ? PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2; else reg = (value) ? PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT; ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset)); if (ret < 0) dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret); } static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset, int value) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; /* Set the initial value */ palmas_gpio_set(gc, offset, value); ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), BIT(offset)); if (ret < 0) dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg, ret); return ret; } static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0); if (ret < 0) dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg, ret); return ret; } static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset); } static const struct palmas_device_data palmas_dev_data = { .ngpio = 8, }; static const struct palmas_device_data tps80036_dev_data = { .ngpio = 16, }; static const struct of_device_id of_palmas_gpio_match[] = { { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,}, { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,}, { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,}, { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,}, { }, }; static int palmas_gpio_probe(struct platform_device *pdev) { struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); struct palmas_platform_data *palmas_pdata; struct palmas_gpio *palmas_gpio; int ret; const struct palmas_device_data *dev_data; dev_data = of_device_get_match_data(&pdev->dev); if (!dev_data) dev_data = &palmas_dev_data; palmas_gpio = devm_kzalloc(&pdev->dev, sizeof(*palmas_gpio), GFP_KERNEL); if (!palmas_gpio) return -ENOMEM; palmas_gpio->palmas = palmas; palmas_gpio->gpio_chip.owner = THIS_MODULE; palmas_gpio->gpio_chip.label = dev_name(&pdev->dev); palmas_gpio->gpio_chip.ngpio = dev_data->ngpio; palmas_gpio->gpio_chip.can_sleep = true; palmas_gpio->gpio_chip.direction_input = palmas_gpio_input; palmas_gpio->gpio_chip.direction_output = palmas_gpio_output; palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq; palmas_gpio->gpio_chip.set = palmas_gpio_set; palmas_gpio->gpio_chip.get = palmas_gpio_get; palmas_gpio->gpio_chip.parent = &pdev->dev; #ifdef CONFIG_OF_GPIO palmas_gpio->gpio_chip.of_node = pdev->dev.of_node; #endif palmas_pdata = dev_get_platdata(palmas->dev); if (palmas_pdata && palmas_pdata->gpio_base) palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base; else palmas_gpio->gpio_chip.base = -1; ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip, palmas_gpio); if (ret < 0) { dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); return ret; } platform_set_drvdata(pdev, palmas_gpio); return ret; } static struct platform_driver palmas_gpio_driver = { .driver.name = "palmas-gpio", .driver.of_match_table = of_palmas_gpio_match, .probe = palmas_gpio_probe, }; static int __init palmas_gpio_init(void) { return platform_driver_register(&palmas_gpio_driver); } subsys_initcall(palmas_gpio_init);