cregit-Linux how code gets into the kernel

Release 4.10 drivers/watchdog/mena21_wdt.c

Directory: drivers/watchdog
/*
 * Watchdog driver for the A21 VME CPU Boards
 *
 * Copyright (C) 2013 MEN Mikro Elektronik Nuernberg GmbH
 *
 * 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
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#include <linux/uaccess.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/delay.h>
#include <linux/bitops.h>


#define NUM_GPIOS 6


enum a21_wdt_gpios {
	
GPIO_WD_ENAB,
	
GPIO_WD_FAST,
	
GPIO_WD_TRIG,
	
GPIO_WD_RST0,
	
GPIO_WD_RST1,
	
GPIO_WD_RST2,
};


struct a21_wdt_drv {
	
struct watchdog_device wdt;
	
struct mutex lock;
	
unsigned gpios[NUM_GPIOS];
};


static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
			    __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");


static unsigned int a21_wdt_get_bootstatus(struct a21_wdt_drv *drv) { int reset = 0; reset |= gpio_get_value(drv->gpios[GPIO_WD_RST0]) ? (1 << 0) : 0; reset |= gpio_get_value(drv->gpios[GPIO_WD_RST1]) ? (1 << 1) : 0; reset |= gpio_get_value(drv->gpios[GPIO_WD_RST2]) ? (1 << 2) : 0; return reset; }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn80100.00%1100.00%
Total80100.00%1100.00%


static int a21_wdt_start(struct watchdog_device *wdt) { struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt); mutex_lock(&drv->lock); gpio_set_value(drv->gpios[GPIO_WD_ENAB], 1); mutex_unlock(&drv->lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn52100.00%1100.00%
Total52100.00%1100.00%


static int a21_wdt_stop(struct watchdog_device *wdt) { struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt); mutex_lock(&drv->lock); gpio_set_value(drv->gpios[GPIO_WD_ENAB], 0); mutex_unlock(&drv->lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn52100.00%1100.00%
Total52100.00%1100.00%


static int a21_wdt_ping(struct watchdog_device *wdt) { struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt); mutex_lock(&drv->lock); gpio_set_value(drv->gpios[GPIO_WD_TRIG], 0); ndelay(10); gpio_set_value(drv->gpios[GPIO_WD_TRIG], 1); mutex_unlock(&drv->lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn69100.00%1100.00%
Total69100.00%1100.00%


static int a21_wdt_set_timeout(struct watchdog_device *wdt, unsigned int timeout) { struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt); if (timeout != 1 && timeout != 30) { dev_err(wdt->parent, "Only 1 and 30 allowed as timeout\n"); return -EINVAL; } if (timeout == 30 && wdt->timeout == 1) { dev_err(wdt->parent, "Transition from fast to slow mode not allowed\n"); return -EINVAL; } mutex_lock(&drv->lock); if (timeout == 1) gpio_set_value(drv->gpios[GPIO_WD_FAST], 1); else gpio_set_value(drv->gpios[GPIO_WD_FAST], 0); wdt->timeout = timeout; mutex_unlock(&drv->lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn13198.50%150.00%
guenter roeckguenter roeck21.50%150.00%
Total133100.00%2100.00%

static const struct watchdog_info a21_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "MEN A21 Watchdog", }; static const struct watchdog_ops a21_wdt_ops = { .owner = THIS_MODULE, .start = a21_wdt_start, .stop = a21_wdt_stop, .ping = a21_wdt_ping, .set_timeout = a21_wdt_set_timeout, }; static struct watchdog_device a21_wdt = { .info = &a21_wdt_info, .ops = &a21_wdt_ops, .min_timeout = 1, .max_timeout = 30, };
static int a21_wdt_probe(struct platform_device *pdev) { struct device_node *node; struct a21_wdt_drv *drv; unsigned int reset = 0; int num_gpios; int ret; int i; drv = devm_kzalloc(&pdev->dev, sizeof(struct a21_wdt_drv), GFP_KERNEL); if (!drv) return -ENOMEM; /* Fill GPIO pin array */ node = pdev->dev.of_node; num_gpios = of_gpio_count(node); if (num_gpios != NUM_GPIOS) { dev_err(&pdev->dev, "gpios DT property wrong, got %d want %d", num_gpios, NUM_GPIOS); return -ENODEV; } for (i = 0; i < num_gpios; i++) { int val; val = of_get_gpio(node, i); if (val < 0) return val; drv->gpios[i] = val; } /* Request the used GPIOs */ for (i = 0; i < num_gpios; i++) { ret = devm_gpio_request(&pdev->dev, drv->gpios[i], "MEN A21 Watchdog"); if (ret) return ret; if (i < GPIO_WD_RST0) ret = gpio_direction_output(drv->gpios[i], gpio_get_value(drv->gpios[i])); else /* GPIO_WD_RST[0..2] are inputs */ ret = gpio_direction_input(drv->gpios[i]); if (ret) return ret; } mutex_init(&drv->lock); watchdog_init_timeout(&a21_wdt, 30, &pdev->dev); watchdog_set_nowayout(&a21_wdt, nowayout); watchdog_set_drvdata(&a21_wdt, drv); a21_wdt.parent = &pdev->dev; reset = a21_wdt_get_bootstatus(drv); if (reset == 2) a21_wdt.bootstatus |= WDIOF_EXTERN1; else if (reset == 4) a21_wdt.bootstatus |= WDIOF_CARDRESET; else if (reset == 5) a21_wdt.bootstatus |= WDIOF_POWERUNDER; else if (reset == 7) a21_wdt.bootstatus |= WDIOF_EXTERN2; drv->wdt = a21_wdt; dev_set_drvdata(&pdev->dev, drv); ret = watchdog_register_device(&a21_wdt); if (ret) { dev_err(&pdev->dev, "Cannot register watchdog device\n"); goto err_register_wd; } dev_info(&pdev->dev, "MEN A21 watchdog timer driver enabled\n"); return 0; err_register_wd: mutex_destroy(&drv->lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn40597.83%266.67%
pratyush anandpratyush anand92.17%133.33%
Total414100.00%3100.00%


static int a21_wdt_remove(struct platform_device *pdev) { struct a21_wdt_drv *drv = dev_get_drvdata(&pdev->dev); dev_warn(&pdev->dev, "Unregistering A21 watchdog driver, board may reboot\n"); watchdog_unregister_device(&drv->wdt); mutex_destroy(&drv->lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn53100.00%1100.00%
Total53100.00%1100.00%


static void a21_wdt_shutdown(struct platform_device *pdev) { struct a21_wdt_drv *drv = dev_get_drvdata(&pdev->dev); gpio_set_value(drv->gpios[GPIO_WD_ENAB], 0); }

Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn36100.00%1100.00%
Total36100.00%1100.00%

static const struct of_device_id a21_wdt_ids[] = { { .compatible = "men,a021-wdt" }, { }, }; MODULE_DEVICE_TABLE(of, a21_wdt_ids); static struct platform_driver a21_wdt_driver = { .probe = a21_wdt_probe, .remove = a21_wdt_remove, .shutdown = a21_wdt_shutdown, .driver = { .name = "a21-watchdog", .of_match_table = a21_wdt_ids, }, }; module_platform_driver(a21_wdt_driver); MODULE_AUTHOR("MEN Mikro Elektronik"); MODULE_DESCRIPTION("MEN A21 Watchdog"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:a21-watchdog");

Overall Contributors

PersonTokensPropCommitsCommitProp
johannes thumshirnjohannes thumshirn114598.45%240.00%
pratyush anandpratyush anand90.77%120.00%
luis de bethencourtluis de bethencourt70.60%120.00%
guenter roeckguenter roeck20.17%120.00%
Total1163100.00%5100.00%
Directory: drivers/watchdog
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.