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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
203 lines
5.3 KiB
C
203 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* TI Palma series PMIC's GPIO driver.
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*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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*/
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#include <linux/gpio/driver.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mfd/palmas.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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struct palmas_gpio {
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struct gpio_chip gpio_chip;
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struct palmas *palmas;
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};
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struct palmas_device_data {
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int ngpio;
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};
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static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct palmas_gpio *pg = gpiochip_get_data(gc);
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struct palmas *palmas = pg->palmas;
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unsigned int val;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
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ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
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if (ret < 0) {
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dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
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return ret;
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}
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if (val & BIT(offset))
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reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
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else
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reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
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ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
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if (ret < 0) {
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dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
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return ret;
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}
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return !!(val & BIT(offset));
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}
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static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct palmas_gpio *pg = gpiochip_get_data(gc);
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struct palmas *palmas = pg->palmas;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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if (gpio16)
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reg = (value) ?
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PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
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else
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reg = (value) ?
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PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
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ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
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if (ret < 0)
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dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
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}
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static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct palmas_gpio *pg = gpiochip_get_data(gc);
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struct palmas *palmas = pg->palmas;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
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/* Set the initial value */
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palmas_gpio_set(gc, offset, value);
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ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
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BIT(offset), BIT(offset));
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if (ret < 0)
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dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
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ret);
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return ret;
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}
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static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
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{
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struct palmas_gpio *pg = gpiochip_get_data(gc);
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struct palmas *palmas = pg->palmas;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
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ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
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if (ret < 0)
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dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
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ret);
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return ret;
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}
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static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct palmas_gpio *pg = gpiochip_get_data(gc);
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struct palmas *palmas = pg->palmas;
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return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
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}
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static const struct palmas_device_data palmas_dev_data = {
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.ngpio = 8,
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};
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static const struct palmas_device_data tps80036_dev_data = {
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.ngpio = 16,
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};
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static const struct of_device_id of_palmas_gpio_match[] = {
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{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
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{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
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{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
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{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
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{ },
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};
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static int palmas_gpio_probe(struct platform_device *pdev)
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{
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struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
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struct palmas_platform_data *palmas_pdata;
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struct palmas_gpio *palmas_gpio;
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int ret;
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const struct palmas_device_data *dev_data;
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dev_data = of_device_get_match_data(&pdev->dev);
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if (!dev_data)
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dev_data = &palmas_dev_data;
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palmas_gpio = devm_kzalloc(&pdev->dev,
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sizeof(*palmas_gpio), GFP_KERNEL);
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if (!palmas_gpio)
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return -ENOMEM;
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palmas_gpio->palmas = palmas;
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palmas_gpio->gpio_chip.owner = THIS_MODULE;
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palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
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palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
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palmas_gpio->gpio_chip.can_sleep = true;
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palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
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palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
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palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
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palmas_gpio->gpio_chip.set = palmas_gpio_set;
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palmas_gpio->gpio_chip.get = palmas_gpio_get;
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palmas_gpio->gpio_chip.parent = &pdev->dev;
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#ifdef CONFIG_OF_GPIO
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palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
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#endif
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palmas_pdata = dev_get_platdata(palmas->dev);
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if (palmas_pdata && palmas_pdata->gpio_base)
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palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
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else
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palmas_gpio->gpio_chip.base = -1;
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ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
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palmas_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, palmas_gpio);
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return ret;
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}
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static struct platform_driver palmas_gpio_driver = {
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.driver.name = "palmas-gpio",
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.driver.of_match_table = of_palmas_gpio_match,
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.probe = palmas_gpio_probe,
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};
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static int __init palmas_gpio_init(void)
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{
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return platform_driver_register(&palmas_gpio_driver);
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}
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subsys_initcall(palmas_gpio_init);
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