cregit-Linux how code gets into the kernel

Release 4.14 drivers/gpio/gpio-mb86s7x.c

Directory: drivers/gpio
/*
 *  linux/drivers/gpio/gpio-mb86s7x.c
 *
 *  Copyright (C) 2015 Fujitsu Semiconductor Limited
 *  Copyright (C) 2015 Linaro Ltd.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, version 2 of the License.
 *
 *  This program is distributed in the hope that 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.
 */

#include <linux/io.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/of_device.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/slab.h>

/*
 * Only first 8bits of a register correspond to each pin,
 * so there are 4 registers for 32 pins.
 */

#define PDR(x)	(0x0 + x / 8 * 4)

#define DDR(x)	(0x10 + x / 8 * 4)

#define PFR(x)	(0x20 + x / 8 * 4)


#define OFFSET(x)	BIT((x) % 8)


struct mb86s70_gpio_chip {
	
struct gpio_chip gc;
	
void __iomem *base;
	
struct clk *clk;
	
spinlock_t lock;
};


static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio) { struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); unsigned long flags; u32 val; spin_lock_irqsave(&gchip->lock, flags); val = readl(gchip->base + PFR(gpio)); if (!(val & OFFSET(gpio))) { spin_unlock_irqrestore(&gchip->lock, flags); return -EINVAL; } val &= ~OFFSET(gpio); writel(val, gchip->base + PFR(gpio)); spin_unlock_irqrestore(&gchip->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar8975.42%133.33%
Axel Lin2823.73%133.33%
Linus Walleij10.85%133.33%
Total118100.00%3100.00%


static void mb86s70_gpio_free(struct gpio_chip *gc, unsigned gpio) { struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); unsigned long flags; u32 val; spin_lock_irqsave(&gchip->lock, flags); val = readl(gchip->base + PFR(gpio)); val |= OFFSET(gpio); writel(val, gchip->base + PFR(gpio)); spin_unlock_irqrestore(&gchip->lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar8598.84%150.00%
Linus Walleij11.16%150.00%
Total86100.00%2100.00%


static int mb86s70_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) { struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); unsigned long flags; unsigned char val; spin_lock_irqsave(&gchip->lock, flags); val = readl(gchip->base + DDR(gpio)); val &= ~OFFSET(gpio); writel(val, gchip->base + DDR(gpio)); spin_unlock_irqrestore(&gchip->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar9098.90%150.00%
Linus Walleij11.10%150.00%
Total91100.00%2100.00%


static int mb86s70_gpio_direction_output(struct gpio_chip *gc, unsigned gpio, int value) { struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); unsigned long flags; unsigned char val; spin_lock_irqsave(&gchip->lock, flags); val = readl(gchip->base + PDR(gpio)); if (value) val |= OFFSET(gpio); else val &= ~OFFSET(gpio); writel(val, gchip->base + PDR(gpio)); val = readl(gchip->base + DDR(gpio)); val |= OFFSET(gpio); writel(val, gchip->base + DDR(gpio)); spin_unlock_irqrestore(&gchip->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar14099.29%150.00%
Linus Walleij10.71%150.00%
Total141100.00%2100.00%


static int mb86s70_gpio_get(struct gpio_chip *gc, unsigned gpio) { struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); return !!(readl(gchip->base + PDR(gpio)) & OFFSET(gpio)); }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar4597.83%150.00%
Linus Walleij12.17%150.00%
Total46100.00%2100.00%


static void mb86s70_gpio_set(struct gpio_chip *gc, unsigned gpio, int value) { struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); unsigned long flags; unsigned char val; spin_lock_irqsave(&gchip->lock, flags); val = readl(gchip->base + PDR(gpio)); if (value) val |= OFFSET(gpio); else val &= ~OFFSET(gpio); writel(val, gchip->base + PDR(gpio)); spin_unlock_irqrestore(&gchip->lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar10299.03%150.00%
Linus Walleij10.97%150.00%
Total103100.00%2100.00%


static int mb86s70_gpio_probe(struct platform_device *pdev) { struct mb86s70_gpio_chip *gchip; struct resource *res; int ret; gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL); if (gchip == NULL) return -ENOMEM; platform_set_drvdata(pdev, gchip); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); gchip->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(gchip->base)) return PTR_ERR(gchip->base); gchip->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(gchip->clk)) return PTR_ERR(gchip->clk); ret = clk_prepare_enable(gchip->clk); if (ret) return ret; spin_lock_init(&gchip->lock); gchip->gc.direction_output = mb86s70_gpio_direction_output; gchip->gc.direction_input = mb86s70_gpio_direction_input; gchip->gc.request = mb86s70_gpio_request; gchip->gc.free = mb86s70_gpio_free; gchip->gc.get = mb86s70_gpio_get; gchip->gc.set = mb86s70_gpio_set; gchip->gc.label = dev_name(&pdev->dev); gchip->gc.ngpio = 32; gchip->gc.owner = THIS_MODULE; gchip->gc.parent = &pdev->dev; gchip->gc.base = -1; ret = gpiochip_add_data(&gchip->gc, gchip); if (ret) { dev_err(&pdev->dev, "couldn't register gpio driver\n"); clk_disable_unprepare(gchip->clk); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar27995.55%125.00%
Arvind Yadav93.08%125.00%
Linus Walleij41.37%250.00%
Total292100.00%4100.00%


static int mb86s70_gpio_remove(struct platform_device *pdev) { struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev); gpiochip_remove(&gchip->gc); clk_disable_unprepare(gchip->clk); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar39100.00%1100.00%
Total39100.00%1100.00%

static const struct of_device_id mb86s70_gpio_dt_ids[] = { { .compatible = "fujitsu,mb86s70-gpio" }, { /* sentinel */ } }; static struct platform_driver mb86s70_gpio_driver = { .driver = { .name = "mb86s70-gpio", .of_match_table = mb86s70_gpio_dt_ids, }, .probe = mb86s70_gpio_probe, .remove = mb86s70_gpio_remove, }; builtin_platform_driver(mb86s70_gpio_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jassi Brar100995.37%116.67%
Axel Lin282.65%116.67%
Linus Walleij100.95%233.33%
Arvind Yadav90.85%116.67%
Geliang Tang20.19%116.67%
Total1058100.00%6100.00%
Directory: drivers/gpio
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.