487722cf2d
I just can't find any value in MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) and MODULE_ALIAS_MISCDEV(TEMP_MINOR) statements. Either the device is enumerated and the driver already has a module alias (e.g. PCI, USB etc.) that will get the right driver loaded automatically. Or the device is not enumerated and loading its driver will lead to more or less intrusive hardware poking. Such hardware poking should be limited to a bare minimum, so the user should really decide which drivers should be tried and in what order. Trying them all in arbitrary order can't do any good. On top of that, loading that many drivers at once bloats the kernel log. Also many drivers will stay loaded afterward, bloating the output of "lsmod" and wasting memory. Some modules (cs5535_mfgpt which gets loaded as a dependency) can't even be unloaded! If defining char-major-10-130 is needed then it should happen in user-space. Signed-off-by: Jean Delvare <jdelvare@suse.de> Acked-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Mike Frysinger <vapier.adi@gmail.com> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Zwane Mwaikambo <zwane@arm.linux.org.uk> Cc: Jim Cromie <jim.cromie@gmail.com>
111 lines
3 KiB
C
111 lines
3 KiB
C
/*
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* Watchdog driver for the RTC based watchdog in STMP3xxx and i.MX23/28
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*
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* Author: Wolfram Sang <w.sang@pengutronix.de>
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*
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* Copyright (C) 2011-12 Wolfram Sang, Pengutronix
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/stmp3xxx_rtc_wdt.h>
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#define WDOG_TICK_RATE 1000 /* 1 kHz clock */
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#define STMP3XXX_DEFAULT_TIMEOUT 19
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#define STMP3XXX_MAX_TIMEOUT (UINT_MAX / WDOG_TICK_RATE)
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static int heartbeat = STMP3XXX_DEFAULT_TIMEOUT;
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module_param(heartbeat, uint, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat period in seconds from 1 to "
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__MODULE_STRING(STMP3XXX_MAX_TIMEOUT) ", default "
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__MODULE_STRING(STMP3XXX_DEFAULT_TIMEOUT));
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static int wdt_start(struct watchdog_device *wdd)
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{
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struct device *dev = watchdog_get_drvdata(wdd);
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struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
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pdata->wdt_set_timeout(dev->parent, wdd->timeout * WDOG_TICK_RATE);
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return 0;
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}
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static int wdt_stop(struct watchdog_device *wdd)
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{
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struct device *dev = watchdog_get_drvdata(wdd);
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struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
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pdata->wdt_set_timeout(dev->parent, 0);
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return 0;
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}
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static int wdt_set_timeout(struct watchdog_device *wdd, unsigned new_timeout)
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{
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wdd->timeout = new_timeout;
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return wdt_start(wdd);
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}
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static const struct watchdog_info stmp3xxx_wdt_ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "STMP3XXX RTC Watchdog",
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};
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static const struct watchdog_ops stmp3xxx_wdt_ops = {
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.owner = THIS_MODULE,
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.start = wdt_start,
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.stop = wdt_stop,
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.set_timeout = wdt_set_timeout,
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};
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static struct watchdog_device stmp3xxx_wdd = {
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.info = &stmp3xxx_wdt_ident,
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.ops = &stmp3xxx_wdt_ops,
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.min_timeout = 1,
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.max_timeout = STMP3XXX_MAX_TIMEOUT,
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.status = WATCHDOG_NOWAYOUT_INIT_STATUS,
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};
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static int stmp3xxx_wdt_probe(struct platform_device *pdev)
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{
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int ret;
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watchdog_set_drvdata(&stmp3xxx_wdd, &pdev->dev);
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stmp3xxx_wdd.timeout = clamp_t(unsigned, heartbeat, 1, STMP3XXX_MAX_TIMEOUT);
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ret = watchdog_register_device(&stmp3xxx_wdd);
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if (ret < 0) {
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dev_err(&pdev->dev, "cannot register watchdog device\n");
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return ret;
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}
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dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n",
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stmp3xxx_wdd.timeout);
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return 0;
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}
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static int stmp3xxx_wdt_remove(struct platform_device *pdev)
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{
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watchdog_unregister_device(&stmp3xxx_wdd);
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return 0;
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}
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static struct platform_driver stmp3xxx_wdt_driver = {
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.driver = {
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.name = "stmp3xxx_rtc_wdt",
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},
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.probe = stmp3xxx_wdt_probe,
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.remove = stmp3xxx_wdt_remove,
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};
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module_platform_driver(stmp3xxx_wdt_driver);
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MODULE_DESCRIPTION("STMP3XXX RTC Watchdog Driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
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