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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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cc7af0bfa0
The platform_set_drvdata() call is only useful if we need to retrieve back the private information. Since the driver doesn't do that, it's not useful to have it. If this is removed, we can also just do a direct return on devm_gpiochip_add_data(). We don't need to print that this call failed as there are other ways to log/see this during probe. Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* TI TPS6586x GPIO driver
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*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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* Author: Laxman dewangan <ldewangan@nvidia.com>
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*
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* Based on tps6586x.c
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* Copyright (c) 2010 CompuLab Ltd.
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* Mike Rapoport <mike@compulab.co.il>
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*/
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#include <linux/errno.h>
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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/tps6586x.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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/* GPIO control registers */
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#define TPS6586X_GPIOSET1 0x5d
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#define TPS6586X_GPIOSET2 0x5e
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struct tps6586x_gpio {
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struct gpio_chip gpio_chip;
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struct device *parent;
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};
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static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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uint8_t val;
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int ret;
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ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
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if (ret)
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return ret;
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return !!(val & (1 << offset));
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}
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static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
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value << offset, 1 << offset);
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}
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static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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uint8_t val, mask;
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tps6586x_gpio_set(gc, offset, value);
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val = 0x1 << (offset * 2);
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mask = 0x3 << (offset * 2);
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return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
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val, mask);
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}
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static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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return tps6586x_irq_get_virq(tps6586x_gpio->parent,
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TPS6586X_INT_PLDO_0 + offset);
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}
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static int tps6586x_gpio_probe(struct platform_device *pdev)
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{
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struct tps6586x_platform_data *pdata;
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struct tps6586x_gpio *tps6586x_gpio;
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pdata = dev_get_platdata(pdev->dev.parent);
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tps6586x_gpio = devm_kzalloc(&pdev->dev,
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sizeof(*tps6586x_gpio), GFP_KERNEL);
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if (!tps6586x_gpio)
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return -ENOMEM;
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tps6586x_gpio->parent = pdev->dev.parent;
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tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
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tps6586x_gpio->gpio_chip.label = pdev->name;
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tps6586x_gpio->gpio_chip.parent = &pdev->dev;
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tps6586x_gpio->gpio_chip.ngpio = 4;
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tps6586x_gpio->gpio_chip.can_sleep = true;
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/* FIXME: add handling of GPIOs as dedicated inputs */
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tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
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tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
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tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
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tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
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#ifdef CONFIG_OF_GPIO
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tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
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#endif
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if (pdata && pdata->gpio_base)
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tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
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else
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tps6586x_gpio->gpio_chip.base = -1;
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return devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
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tps6586x_gpio);
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}
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static struct platform_driver tps6586x_gpio_driver = {
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.driver.name = "tps6586x-gpio",
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.probe = tps6586x_gpio_probe,
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};
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static int __init tps6586x_gpio_init(void)
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{
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return platform_driver_register(&tps6586x_gpio_driver);
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}
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subsys_initcall(tps6586x_gpio_init);
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