![Guenter Roeck](/assets/img/avatar_default.png)
Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly. The conversion was done automatically with coccinelle using the following semantic patches. The semantic patches and the scripts used to generate this commit log are available at https://github.com/groeck/coccinelle-patches Cc: Johannes Thumshirn <morbidrsa@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Johannes Thumshirn <jth@kernel.org> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
231 lines
5.2 KiB
C
231 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Watchdog driver for the A21 VME CPU Boards
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*
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* Copyright (C) 2013 MEN Mikro Elektronik Nuernberg GmbH
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#include <linux/uaccess.h>
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#include <linux/gpio/consumer.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <linux/of.h>
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#define NUM_GPIOS 6
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enum a21_wdt_gpios {
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GPIO_WD_ENAB,
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GPIO_WD_FAST,
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GPIO_WD_TRIG,
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GPIO_WD_RST0,
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GPIO_WD_RST1,
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GPIO_WD_RST2,
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};
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struct a21_wdt_drv {
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struct watchdog_device wdt;
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struct gpio_desc *gpios[NUM_GPIOS];
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};
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static unsigned int a21_wdt_get_bootstatus(struct a21_wdt_drv *drv)
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{
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int reset = 0;
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reset |= gpiod_get_value(drv->gpios[GPIO_WD_RST0]) ? (1 << 0) : 0;
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reset |= gpiod_get_value(drv->gpios[GPIO_WD_RST1]) ? (1 << 1) : 0;
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reset |= gpiod_get_value(drv->gpios[GPIO_WD_RST2]) ? (1 << 2) : 0;
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return reset;
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}
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static int a21_wdt_start(struct watchdog_device *wdt)
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{
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struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
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gpiod_set_value(drv->gpios[GPIO_WD_ENAB], 1);
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return 0;
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}
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static int a21_wdt_stop(struct watchdog_device *wdt)
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{
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struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
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gpiod_set_value(drv->gpios[GPIO_WD_ENAB], 0);
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return 0;
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}
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static int a21_wdt_ping(struct watchdog_device *wdt)
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{
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struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
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gpiod_set_value(drv->gpios[GPIO_WD_TRIG], 0);
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ndelay(10);
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gpiod_set_value(drv->gpios[GPIO_WD_TRIG], 1);
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return 0;
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}
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static int a21_wdt_set_timeout(struct watchdog_device *wdt,
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unsigned int timeout)
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{
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struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
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if (timeout != 1 && timeout != 30) {
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dev_err(wdt->parent, "Only 1 and 30 allowed as timeout\n");
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return -EINVAL;
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}
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if (timeout == 30 && wdt->timeout == 1) {
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dev_err(wdt->parent,
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"Transition from fast to slow mode not allowed\n");
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return -EINVAL;
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}
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if (timeout == 1)
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gpiod_set_value(drv->gpios[GPIO_WD_FAST], 1);
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else
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gpiod_set_value(drv->gpios[GPIO_WD_FAST], 0);
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wdt->timeout = timeout;
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return 0;
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}
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static const struct watchdog_info a21_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "MEN A21 Watchdog",
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};
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static const struct watchdog_ops a21_wdt_ops = {
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.owner = THIS_MODULE,
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.start = a21_wdt_start,
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.stop = a21_wdt_stop,
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.ping = a21_wdt_ping,
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.set_timeout = a21_wdt_set_timeout,
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};
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static struct watchdog_device a21_wdt = {
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.info = &a21_wdt_info,
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.ops = &a21_wdt_ops,
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.min_timeout = 1,
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.max_timeout = 30,
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};
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static int a21_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct a21_wdt_drv *drv;
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unsigned int reset = 0;
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int num_gpios;
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int ret;
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int i;
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drv = devm_kzalloc(dev, sizeof(struct a21_wdt_drv), GFP_KERNEL);
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if (!drv)
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return -ENOMEM;
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num_gpios = gpiod_count(dev, NULL);
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if (num_gpios != NUM_GPIOS) {
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dev_err(dev, "gpios DT property wrong, got %d want %d",
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num_gpios, NUM_GPIOS);
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return -ENODEV;
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}
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/* Request the used GPIOs */
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for (i = 0; i < num_gpios; i++) {
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enum gpiod_flags gflags;
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if (i < GPIO_WD_RST0)
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gflags = GPIOD_ASIS;
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else
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gflags = GPIOD_IN;
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drv->gpios[i] = devm_gpiod_get_index(dev, NULL, i, gflags);
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if (IS_ERR(drv->gpios[i]))
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return PTR_ERR(drv->gpios[i]);
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gpiod_set_consumer_name(drv->gpios[i], "MEN A21 Watchdog");
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/*
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* Retrieve the initial value from the GPIOs that should be
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* output, then set up the line as output with that value.
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*/
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if (i < GPIO_WD_RST0) {
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int val;
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val = gpiod_get_value(drv->gpios[i]);
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gpiod_direction_output(drv->gpios[i], val);
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}
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}
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watchdog_init_timeout(&a21_wdt, 30, dev);
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watchdog_set_nowayout(&a21_wdt, nowayout);
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watchdog_set_drvdata(&a21_wdt, drv);
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a21_wdt.parent = dev;
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reset = a21_wdt_get_bootstatus(drv);
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if (reset == 2)
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a21_wdt.bootstatus |= WDIOF_EXTERN1;
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else if (reset == 4)
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a21_wdt.bootstatus |= WDIOF_CARDRESET;
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else if (reset == 5)
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a21_wdt.bootstatus |= WDIOF_POWERUNDER;
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else if (reset == 7)
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a21_wdt.bootstatus |= WDIOF_EXTERN2;
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drv->wdt = a21_wdt;
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dev_set_drvdata(dev, drv);
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ret = devm_watchdog_register_device(dev, &a21_wdt);
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if (ret) {
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dev_err(dev, "Cannot register watchdog device\n");
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return ret;
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}
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dev_info(dev, "MEN A21 watchdog timer driver enabled\n");
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return 0;
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}
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static void a21_wdt_shutdown(struct platform_device *pdev)
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{
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struct a21_wdt_drv *drv = dev_get_drvdata(&pdev->dev);
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gpiod_set_value(drv->gpios[GPIO_WD_ENAB], 0);
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}
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static const struct of_device_id a21_wdt_ids[] = {
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{ .compatible = "men,a021-wdt" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, a21_wdt_ids);
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static struct platform_driver a21_wdt_driver = {
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.probe = a21_wdt_probe,
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.shutdown = a21_wdt_shutdown,
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.driver = {
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.name = "a21-watchdog",
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.of_match_table = a21_wdt_ids,
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},
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};
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module_platform_driver(a21_wdt_driver);
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MODULE_AUTHOR("MEN Mikro Elektronik");
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MODULE_DESCRIPTION("MEN A21 Watchdog");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:a21-watchdog");
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