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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2cad6a8a4c
platform_device_unregister() only calls platform_device_del() and platform_device_put(), thus use platform_device_unregister() to simplify the code. Also the documents in platform.c shows that platform_device_del and platform_device_put must _only_ be externally called in error cases. All other usage is a bug. dpatch engine is used to auto generate this patch. (https://github.com/weiyj/dpatch) Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
200 lines
5.0 KiB
C
200 lines
5.0 KiB
C
/*
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* CLPS711X GPIO driver
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*
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* Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <mach/hardware.h>
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#define CLPS711X_GPIO_PORTS 5
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#define CLPS711X_GPIO_NAME "gpio-clps711x"
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struct clps711x_gpio {
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struct gpio_chip chip[CLPS711X_GPIO_PORTS];
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spinlock_t lock;
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};
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static void __iomem *clps711x_ports[] = {
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CLPS711X_VIRT_BASE + PADR,
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CLPS711X_VIRT_BASE + PBDR,
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CLPS711X_VIRT_BASE + PCDR,
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CLPS711X_VIRT_BASE + PDDR,
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CLPS711X_VIRT_BASE + PEDR,
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};
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static void __iomem *clps711x_pdirs[] = {
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CLPS711X_VIRT_BASE + PADDR,
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CLPS711X_VIRT_BASE + PBDDR,
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CLPS711X_VIRT_BASE + PCDDR,
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CLPS711X_VIRT_BASE + PDDDR,
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CLPS711X_VIRT_BASE + PEDDR,
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};
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#define clps711x_port(x) clps711x_ports[x->base / 8]
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#define clps711x_pdir(x) clps711x_pdirs[x->base / 8]
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static int gpio_clps711x_get(struct gpio_chip *chip, unsigned offset)
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{
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return !!(readb(clps711x_port(chip)) & (1 << offset));
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}
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static void gpio_clps711x_set(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_port(chip)) & ~(1 << offset);
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if (value)
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tmp |= 1 << offset;
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writeb(tmp, clps711x_port(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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}
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static int gpio_clps711x_dir_in(struct gpio_chip *chip, unsigned offset)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) & ~(1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static int gpio_clps711x_dir_out(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) | (1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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tmp = readb(clps711x_port(chip)) & ~(1 << offset);
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if (value)
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tmp |= 1 << offset;
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writeb(tmp, clps711x_port(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static int gpio_clps711x_dir_in_inv(struct gpio_chip *chip, unsigned offset)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) | (1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static int gpio_clps711x_dir_out_inv(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) & ~(1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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tmp = readb(clps711x_port(chip)) & ~(1 << offset);
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if (value)
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tmp |= 1 << offset;
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writeb(tmp, clps711x_port(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static struct {
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char *name;
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int nr;
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int inv_dir;
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} clps711x_gpio_ports[] __initconst = {
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{ "PORTA", 8, 0, },
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{ "PORTB", 8, 0, },
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{ "PORTC", 8, 0, },
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{ "PORTD", 8, 1, },
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{ "PORTE", 3, 0, },
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};
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static int __init gpio_clps711x_init(void)
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{
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int i;
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struct platform_device *pdev;
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struct clps711x_gpio *gpio;
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pdev = platform_device_alloc(CLPS711X_GPIO_NAME, 0);
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if (!pdev) {
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pr_err("Cannot create platform device: %s\n",
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CLPS711X_GPIO_NAME);
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return -ENOMEM;
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}
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platform_device_add(pdev);
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gpio = devm_kzalloc(&pdev->dev, sizeof(struct clps711x_gpio),
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GFP_KERNEL);
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if (!gpio) {
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dev_err(&pdev->dev, "GPIO allocating memory error\n");
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platform_device_unregister(pdev);
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, gpio);
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spin_lock_init(&gpio->lock);
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for (i = 0; i < CLPS711X_GPIO_PORTS; i++) {
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gpio->chip[i].owner = THIS_MODULE;
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gpio->chip[i].dev = &pdev->dev;
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gpio->chip[i].label = clps711x_gpio_ports[i].name;
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gpio->chip[i].base = i * 8;
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gpio->chip[i].ngpio = clps711x_gpio_ports[i].nr;
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gpio->chip[i].get = gpio_clps711x_get;
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gpio->chip[i].set = gpio_clps711x_set;
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if (!clps711x_gpio_ports[i].inv_dir) {
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gpio->chip[i].direction_input = gpio_clps711x_dir_in;
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gpio->chip[i].direction_output = gpio_clps711x_dir_out;
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} else {
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gpio->chip[i].direction_input = gpio_clps711x_dir_in_inv;
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gpio->chip[i].direction_output = gpio_clps711x_dir_out_inv;
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}
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WARN_ON(gpiochip_add(&gpio->chip[i]));
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}
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dev_info(&pdev->dev, "GPIO driver initialized\n");
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return 0;
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}
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arch_initcall(gpio_clps711x_init);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
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MODULE_DESCRIPTION("CLPS711X GPIO driver");
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