From patchwork Thu Feb 4 17:00:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ahmad Fatoum X-Patchwork-Id: 377404 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 639A6C433E0 for ; Thu, 4 Feb 2021 17:05:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3466964F6A for ; Thu, 4 Feb 2021 17:05:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237485AbhBDRFA (ORCPT ); Thu, 4 Feb 2021 12:05:00 -0500 Received: from metis.ext.pengutronix.de ([85.220.165.71]:40793 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236997AbhBDREU (ORCPT ); Thu, 4 Feb 2021 12:04:20 -0500 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l7i0V-0002k5-Cy; Thu, 04 Feb 2021 18:01:27 +0100 Received: from afa by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1l7i0V-0001Ne-4M; Thu, 04 Feb 2021 18:01:27 +0100 From: Ahmad Fatoum To: Wim Van Sebroeck , Guenter Roeck Cc: kernel@pengutronix.de, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, Ahmad Fatoum Subject: [PATCH v3 1/3] watchdog: f71808e_wdt: rename variant-independent identifiers appropriately Date: Thu, 4 Feb 2021 18:00:48 +0100 Message-Id: <7516c77a131261bc3c606b0d49d8c656a22d5f2d.1612457906.git-series.a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.30.0 In-Reply-To: References: MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: afa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-watchdog@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Code for the common parts of the driver either uses watchdog_ as prefix for the watchdog API or f71808e_ for everything else. The driver now supports 9 more variants besides the f71808e, so let's rename the common parts to start with fintek_wdt_ instead. This makes code browsing easier, because it's readily apparent that functions are not variant-specific. Some watchdog_-prefixed functions remain, but these will be dropped altogether with the move to the kernel watchdog API in a later commit. Signed-off-by: Ahmad Fatoum --- drivers/watchdog/f71808e_wdt.c | 66 +++++++++++++++++------------------ 1 file changed, 33 insertions(+), 33 deletions(-) diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c index f60beec1bbae..665bef272a33 100644 --- a/drivers/watchdog/f71808e_wdt.c +++ b/drivers/watchdog/f71808e_wdt.c @@ -113,7 +113,7 @@ MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with" enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg, f81803, f81865, f81866}; -static const char *f71808e_names[] = { +static const char *fintek_wdt_names[] = { "f71808fg", "f71858fg", "f71862fg", @@ -136,7 +136,7 @@ static inline int superio_enter(int base); static inline void superio_select(int base, int ld); static inline void superio_exit(int base); -struct watchdog_data { +struct fintek_wdt { unsigned short sioaddr; enum chips type; unsigned long opened; @@ -152,7 +152,7 @@ struct watchdog_data { char caused_reboot; /* last reboot was by the watchdog */ }; -static struct watchdog_data watchdog = { +static struct fintek_wdt watchdog = { .lock = __MUTEX_INITIALIZER(watchdog.lock), }; @@ -218,7 +218,7 @@ static inline void superio_exit(int base) release_region(base, 2); } -static int watchdog_set_timeout(int timeout) +static int fintek_wdt_set_timeout(int timeout) { if (timeout <= 0 || timeout > max_timeout) { @@ -242,7 +242,7 @@ static int watchdog_set_timeout(int timeout) return 0; } -static int watchdog_set_pulse_width(unsigned int pw) +static int fintek_wdt_set_pulse_width(unsigned int pw) { int err = 0; unsigned int t1 = 25, t2 = 125, t3 = 5000; @@ -276,7 +276,7 @@ static int watchdog_set_pulse_width(unsigned int pw) return err; } -static int watchdog_keepalive(void) +static int fintek_wdt_keepalive(void) { int err = 0; @@ -306,13 +306,13 @@ static int watchdog_keepalive(void) return err; } -static int watchdog_start(void) +static int fintek_wdt_start(void) { int err; u8 tmp; /* Make sure we don't die as soon as the watchdog is enabled below */ - err = watchdog_keepalive(); + err = fintek_wdt_keepalive(); if (err) return err; @@ -433,7 +433,7 @@ static int watchdog_start(void) return err; } -static int watchdog_stop(void) +static int fintek_wdt_stop(void) { int err = 0; @@ -465,7 +465,7 @@ static int watchdog_get_status(void) return status; } -static bool watchdog_is_running(void) +static bool fintek_wdt_is_running(void) { /* * if we fail to determine the watchdog's status assume it to be @@ -499,7 +499,7 @@ static int watchdog_open(struct inode *inode, struct file *file) if (test_and_set_bit(0, &watchdog.opened)) return -EBUSY; - err = watchdog_start(); + err = fintek_wdt_start(); if (err) { clear_bit(0, &watchdog.opened); return err; @@ -517,10 +517,10 @@ static int watchdog_release(struct inode *inode, struct file *file) clear_bit(0, &watchdog.opened); if (!watchdog.expect_close) { - watchdog_keepalive(); + fintek_wdt_keepalive(); pr_crit("Unexpected close, not stopping watchdog!\n"); } else if (!nowayout) { - watchdog_stop(); + fintek_wdt_stop(); } return 0; } @@ -561,7 +561,7 @@ static ssize_t watchdog_write(struct file *file, const char __user *buf, } /* someone wrote to us, we should restart timer */ - watchdog_keepalive(); + fintek_wdt_keepalive(); } return count; } @@ -608,24 +608,24 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd, return -EFAULT; if (new_options & WDIOS_DISABLECARD) - watchdog_stop(); + fintek_wdt_stop(); if (new_options & WDIOS_ENABLECARD) - return watchdog_start(); + return fintek_wdt_start(); fallthrough; case WDIOC_KEEPALIVE: - watchdog_keepalive(); + fintek_wdt_keepalive(); return 0; case WDIOC_SETTIMEOUT: if (get_user(new_timeout, uarg.i)) return -EFAULT; - if (watchdog_set_timeout(new_timeout)) + if (fintek_wdt_set_timeout(new_timeout)) return -EINVAL; - watchdog_keepalive(); + fintek_wdt_keepalive(); fallthrough; case WDIOC_GETTIMEOUT: @@ -641,7 +641,7 @@ static int watchdog_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code == SYS_DOWN || code == SYS_HALT) - watchdog_stop(); + fintek_wdt_stop(); return NOTIFY_DONE; } @@ -679,7 +679,7 @@ static int __init watchdog_init(int sioaddr) snprintf(watchdog.ident.identity, sizeof(watchdog.ident.identity), "%s watchdog", - f71808e_names[watchdog.type]); + fintek_wdt_names[watchdog.type]); err = superio_enter(sioaddr); if (err) @@ -698,10 +698,10 @@ static int __init watchdog_init(int sioaddr) superio_exit(sioaddr); - err = watchdog_set_timeout(timeout); + err = fintek_wdt_set_timeout(timeout); if (err) return err; - err = watchdog_set_pulse_width(pulse_width); + err = fintek_wdt_set_pulse_width(pulse_width); if (err) return err; @@ -724,7 +724,7 @@ static int __init watchdog_init(int sioaddr) goto exit_miscdev; } - err = watchdog_start(); + err = fintek_wdt_start(); if (err) { pr_err("cannot start watchdog timer\n"); goto exit_miscdev; @@ -772,7 +772,7 @@ static int __init watchdog_init(int sioaddr) return err; } -static int __init f71808e_find(int sioaddr) +static int __init fintek_wdt_find(int sioaddr) { u16 devid; int err = superio_enter(sioaddr); @@ -828,14 +828,14 @@ static int __init f71808e_find(int sioaddr) } pr_info("Found %s watchdog chip, revision %d\n", - f71808e_names[watchdog.type], + fintek_wdt_names[watchdog.type], (int)superio_inb(sioaddr, SIO_REG_DEVREV)); exit: superio_exit(sioaddr); return err; } -static int __init f71808e_init(void) +static int __init fintek_wdt_init(void) { static const unsigned short addrs[] = { 0x2e, 0x4e }; int err = -ENODEV; @@ -847,7 +847,7 @@ static int __init f71808e_init(void) } for (i = 0; i < ARRAY_SIZE(addrs); i++) { - err = f71808e_find(addrs[i]); + err = fintek_wdt_find(addrs[i]); if (err == 0) break; } @@ -857,11 +857,11 @@ static int __init f71808e_init(void) return watchdog_init(addrs[i]); } -static void __exit f71808e_exit(void) +static void __exit fintek_wdt_exit(void) { - if (watchdog_is_running()) { + if (fintek_wdt_is_running()) { pr_warn("Watchdog timer still running, stopping it\n"); - watchdog_stop(); + fintek_wdt_stop(); } misc_deregister(&watchdog_miscdev); unregister_reboot_notifier(&watchdog_notifier); @@ -871,5 +871,5 @@ MODULE_DESCRIPTION("F71808E Watchdog Driver"); MODULE_AUTHOR("Giel van Schijndel "); MODULE_LICENSE("GPL"); -module_init(f71808e_init); -module_exit(f71808e_exit); +module_init(fintek_wdt_init); +module_exit(fintek_wdt_exit); From patchwork Thu Feb 4 17:00:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ahmad Fatoum X-Patchwork-Id: 376701 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08713C43381 for ; Thu, 4 Feb 2021 17:02:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CABB764F65 for ; Thu, 4 Feb 2021 17:02:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238069AbhBDRC3 (ORCPT ); Thu, 4 Feb 2021 12:02:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238320AbhBDRCN (ORCPT ); Thu, 4 Feb 2021 12:02:13 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 503FAC0613D6 for ; Thu, 4 Feb 2021 09:01:32 -0800 (PST) Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l7i0Y-0002kX-Er; Thu, 04 Feb 2021 18:01:30 +0100 Received: from afa by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1l7i0Y-0001Nu-5u; Thu, 04 Feb 2021 18:01:30 +0100 From: Ahmad Fatoum To: Wim Van Sebroeck , Guenter Roeck Cc: kernel@pengutronix.de, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, Ahmad Fatoum Subject: [PATCH v3 2/3] watchdog: f71808e_wdt: migrate to new kernel watchdog API Date: Thu, 4 Feb 2021 18:00:49 +0100 Message-Id: <35b474fa750fa11781509e94675fc90e28b2d514.1612457906.git-series.a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.30.0 In-Reply-To: References: MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: afa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-watchdog@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Migrating the driver lets us drop the watchdog misc device boilerplate and reduces size by 285 lines. It also brings us support for new functionality like CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED. This incurs a slight backwards-compatibility break, because the new kernel watchdog API doesn't support unloading modules for drivers whose watchdog hardware is reported to be running. This means following scenario will be no longer supported: - BIOS has enabled watchdog - Module is loaded and unloaded without opening watchdog - module_exit is expected to succeed and disable watchdog HW Signed-off-by: Ahmad Fatoum --- drivers/watchdog/Kconfig | 1 +- drivers/watchdog/f71808e_wdt.c | 390 ++++------------------------------ 2 files changed, 53 insertions(+), 338 deletions(-) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 7ff941e71b79..cbce0c176a7e 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1081,6 +1081,7 @@ config EBC_C384_WDT config F71808E_WDT tristate "Fintek F718xx, F818xx Super I/O Watchdog" depends on X86 + select WATCHDOG_CORE help This is the driver for the hardware watchdog on the Fintek F71808E, F71862FG, F71868, F71869, F71882FG, F71889FG, F81803, F81865, and diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c index 665bef272a33..5496d2bb0089 100644 --- a/drivers/watchdog/f71808e_wdt.c +++ b/drivers/watchdog/f71808e_wdt.c @@ -9,16 +9,10 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include -#include #include #include #include -#include #include -#include -#include -#include -#include #include #define DRVNAME "f71808e_wdt" @@ -137,24 +131,18 @@ static inline void superio_select(int base, int ld); static inline void superio_exit(int base); struct fintek_wdt { + struct watchdog_device wdd; unsigned short sioaddr; enum chips type; - unsigned long opened; - struct mutex lock; - char expect_close; struct watchdog_info ident; - unsigned short timeout; u8 timer_val; /* content for the wd_time register */ char minutes_mode; u8 pulse_val; /* pulse width flag */ char pulse_mode; /* enable pulse output mode? */ - char caused_reboot; /* last reboot was by the watchdog */ }; -static struct fintek_wdt watchdog = { - .lock = __MUTEX_INITIALIZER(watchdog.lock), -}; +static struct fintek_wdt watchdog; /* Super I/O functions */ static inline int superio_inb(int base, int reg) @@ -218,17 +206,9 @@ static inline void superio_exit(int base) release_region(base, 2); } -static int fintek_wdt_set_timeout(int timeout) +static int fintek_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout) { - if (timeout <= 0 - || timeout > max_timeout) { - pr_err("watchdog timeout out of range\n"); - return -EINVAL; - } - - mutex_lock(&watchdog.lock); - - watchdog.timeout = timeout; + wdd->timeout = timeout; if (timeout > 0xff) { watchdog.timer_val = DIV_ROUND_UP(timeout, 60); watchdog.minutes_mode = true; @@ -237,14 +217,11 @@ static int fintek_wdt_set_timeout(int timeout) watchdog.minutes_mode = false; } - mutex_unlock(&watchdog.lock); - return 0; } static int fintek_wdt_set_pulse_width(unsigned int pw) { - int err = 0; unsigned int t1 = 25, t2 = 125, t3 = 5000; if (watchdog.type == f71868) { @@ -253,8 +230,6 @@ static int fintek_wdt_set_pulse_width(unsigned int pw) t3 = 6000; } - mutex_lock(&watchdog.lock); - if (pw <= 1) { watchdog.pulse_val = 0; } else if (pw <= t1) { @@ -265,25 +240,21 @@ static int fintek_wdt_set_pulse_width(unsigned int pw) watchdog.pulse_val = 3; } else { pr_err("pulse width out of range\n"); - err = -EINVAL; - goto exit_unlock; + return -EINVAL; } watchdog.pulse_mode = pw; -exit_unlock: - mutex_unlock(&watchdog.lock); - return err; + return 0; } -static int fintek_wdt_keepalive(void) +static int fintek_wdt_keepalive(struct watchdog_device *wdd) { - int err = 0; + int err; - mutex_lock(&watchdog.lock); err = superio_enter(watchdog.sioaddr); if (err) - goto exit_unlock; + return err; superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); if (watchdog.minutes_mode) @@ -301,25 +272,22 @@ static int fintek_wdt_keepalive(void) superio_exit(watchdog.sioaddr); -exit_unlock: - mutex_unlock(&watchdog.lock); - return err; + return 0; } -static int fintek_wdt_start(void) +static int fintek_wdt_start(struct watchdog_device *wdd) { int err; u8 tmp; /* Make sure we don't die as soon as the watchdog is enabled below */ - err = fintek_wdt_keepalive(); + err = fintek_wdt_keepalive(wdd); if (err) return err; - mutex_lock(&watchdog.lock); err = superio_enter(watchdog.sioaddr); if (err) - goto exit_unlock; + return err; superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); /* Watchdog pin configuration */ @@ -407,6 +375,8 @@ static int fintek_wdt_start(void) superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, F71808FG_FLAG_WD_EN); + set_bit(WDOG_HW_RUNNING, &wdd->status); + if (watchdog.pulse_mode) { /* Select "pulse" output mode with given duration */ u8 wdt_conf = superio_inb(watchdog.sioaddr, @@ -427,20 +397,17 @@ static int fintek_wdt_start(void) exit_superio: superio_exit(watchdog.sioaddr); -exit_unlock: - mutex_unlock(&watchdog.lock); return err; } -static int fintek_wdt_stop(void) +static int fintek_wdt_stop(struct watchdog_device *wdd) { - int err = 0; + int err; - mutex_lock(&watchdog.lock); err = superio_enter(watchdog.sioaddr); if (err) - goto exit_unlock; + return err; superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, @@ -448,232 +415,31 @@ static int fintek_wdt_stop(void) superio_exit(watchdog.sioaddr); -exit_unlock: - mutex_unlock(&watchdog.lock); - - return err; -} - -static int watchdog_get_status(void) -{ - int status = 0; - - mutex_lock(&watchdog.lock); - status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0; - mutex_unlock(&watchdog.lock); - - return status; -} - -static bool fintek_wdt_is_running(void) -{ - /* - * if we fail to determine the watchdog's status assume it to be - * running to be on the safe side - */ - bool is_running = true; - - mutex_lock(&watchdog.lock); - if (superio_enter(watchdog.sioaddr)) - goto exit_unlock; - superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); - - is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0)) - && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF) - & BIT(F71808FG_FLAG_WD_EN)); - - superio_exit(watchdog.sioaddr); - -exit_unlock: - mutex_unlock(&watchdog.lock); - return is_running; -} - -/* /dev/watchdog api */ - -static int watchdog_open(struct inode *inode, struct file *file) -{ - int err; - - /* If the watchdog is alive we don't need to start it again */ - if (test_and_set_bit(0, &watchdog.opened)) - return -EBUSY; - - err = fintek_wdt_start(); - if (err) { - clear_bit(0, &watchdog.opened); - return err; - } - - if (nowayout) - __module_get(THIS_MODULE); - - watchdog.expect_close = 0; - return stream_open(inode, file); -} - -static int watchdog_release(struct inode *inode, struct file *file) -{ - clear_bit(0, &watchdog.opened); - - if (!watchdog.expect_close) { - fintek_wdt_keepalive(); - pr_crit("Unexpected close, not stopping watchdog!\n"); - } else if (!nowayout) { - fintek_wdt_stop(); - } return 0; } -/* - * watchdog_write: - * @file: file handle to the watchdog - * @buf: buffer to write - * @count: count of bytes - * @ppos: pointer to the position to write. No seeks allowed - * - * A write to a watchdog device is defined as a keepalive signal. Any - * write of data will do, as we we don't define content meaning. - */ - -static ssize_t watchdog_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) +static bool fintek_wdt_is_running(u8 wdt_conf) { - if (count) { - if (!nowayout) { - size_t i; - - /* In case it was set long ago */ - bool expect_close = false; - - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf + i)) - return -EFAULT; - if (c == 'V') - expect_close = true; - } - - /* Properly order writes across fork()ed processes */ - mutex_lock(&watchdog.lock); - watchdog.expect_close = expect_close; - mutex_unlock(&watchdog.lock); - } - - /* someone wrote to us, we should restart timer */ - fintek_wdt_keepalive(); - } - return count; + return (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0)) + && (wdt_conf & BIT(F71808FG_FLAG_WD_EN)); } -/* - * watchdog_ioctl: - * @inode: inode of the device - * @file: file handle to the device - * @cmd: watchdog command - * @arg: argument pointer - * - * The watchdog API defines a common set of functions for all watchdogs - * according to their available features. - */ -static long watchdog_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - int status; - int new_options; - int new_timeout; - union { - struct watchdog_info __user *ident; - int __user *i; - } uarg; - - uarg.i = (int __user *)arg; - - switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(uarg.ident, &watchdog.ident, - sizeof(watchdog.ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - status = watchdog_get_status(); - if (status < 0) - return status; - return put_user(status, uarg.i); - - case WDIOC_GETBOOTSTATUS: - return put_user(0, uarg.i); - - case WDIOC_SETOPTIONS: - if (get_user(new_options, uarg.i)) - return -EFAULT; - - if (new_options & WDIOS_DISABLECARD) - fintek_wdt_stop(); - - if (new_options & WDIOS_ENABLECARD) - return fintek_wdt_start(); - fallthrough; - - case WDIOC_KEEPALIVE: - fintek_wdt_keepalive(); - return 0; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, uarg.i)) - return -EFAULT; - - if (fintek_wdt_set_timeout(new_timeout)) - return -EINVAL; - - fintek_wdt_keepalive(); - fallthrough; - - case WDIOC_GETTIMEOUT: - return put_user(watchdog.timeout, uarg.i); - - default: - return -ENOTTY; - - } -} - -static int watchdog_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - fintek_wdt_stop(); - return NOTIFY_DONE; -} - -static const struct file_operations watchdog_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .open = watchdog_open, - .release = watchdog_release, - .write = watchdog_write, - .unlocked_ioctl = watchdog_ioctl, - .compat_ioctl = compat_ptr_ioctl, -}; - -static struct miscdevice watchdog_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &watchdog_fops, -}; - -static struct notifier_block watchdog_notifier = { - .notifier_call = watchdog_notify_sys, +static const struct watchdog_ops fintek_wdt_ops = { + .owner = THIS_MODULE, + .start = fintek_wdt_start, + .stop = fintek_wdt_stop, + .ping = fintek_wdt_keepalive, + .set_timeout = fintek_wdt_set_timeout, }; static int __init watchdog_init(int sioaddr) { + struct watchdog_device *wdd; int wdt_conf, err = 0; - /* No need to lock watchdog.lock here because no entry points - * into the module have been registered yet. - */ watchdog.sioaddr = sioaddr; - watchdog.ident.options = WDIOF_MAGICCLOSE + watchdog.ident.options = WDIOF_SETTIMEOUT + | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_CARDRESET; @@ -687,7 +453,6 @@ static int __init watchdog_init(int sioaddr) superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF); - watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS); /* * We don't want WDTMOUT_STS to stick around till regular reboot. @@ -696,80 +461,34 @@ static int __init watchdog_init(int sioaddr) superio_outb(sioaddr, F71808FG_REG_WDT_CONF, wdt_conf | BIT(F71808FG_FLAG_WDTMOUT_STS)); - superio_exit(sioaddr); - - err = fintek_wdt_set_timeout(timeout); - if (err) - return err; - err = fintek_wdt_set_pulse_width(pulse_width); - if (err) - return err; - - err = register_reboot_notifier(&watchdog_notifier); - if (err) - return err; + wdd = &watchdog.wdd; - err = misc_register(&watchdog_miscdev); - if (err) { - pr_err("cannot register miscdev on minor=%d\n", - watchdog_miscdev.minor); - goto exit_reboot; - } + if (fintek_wdt_is_running(wdt_conf)) + set_bit(WDOG_HW_RUNNING, &wdd->status); - if (start_withtimeout) { - if (start_withtimeout <= 0 - || start_withtimeout > max_timeout) { - pr_err("starting timeout out of range\n"); - err = -EINVAL; - goto exit_miscdev; - } - - err = fintek_wdt_start(); - if (err) { - pr_err("cannot start watchdog timer\n"); - goto exit_miscdev; - } - - mutex_lock(&watchdog.lock); - err = superio_enter(sioaddr); - if (err) - goto exit_unlock; - superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); - - if (start_withtimeout > 0xff) { - /* select minutes for timer units */ - superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF, - F71808FG_FLAG_WD_UNIT); - superio_outb(sioaddr, F71808FG_REG_WD_TIME, - DIV_ROUND_UP(start_withtimeout, 60)); - } else { - /* select seconds for timer units */ - superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF, - F71808FG_FLAG_WD_UNIT); - superio_outb(sioaddr, F71808FG_REG_WD_TIME, - start_withtimeout); - } + superio_exit(sioaddr); - superio_exit(sioaddr); - mutex_unlock(&watchdog.lock); + wdd->info = &watchdog.ident; + wdd->ops = &fintek_wdt_ops; + wdd->min_timeout = 1; + wdd->max_timeout = max_timeout; - if (nowayout) - __module_get(THIS_MODULE); + watchdog_set_nowayout(wdd, nowayout); + watchdog_stop_on_unregister(wdd); + watchdog_stop_on_reboot(wdd); + watchdog_init_timeout(wdd, start_withtimeout, NULL); - pr_info("watchdog started with initial timeout of %u sec\n", - start_withtimeout); - } + if (wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS)) + wdd->bootstatus = WDIOF_CARDRESET; - return 0; - -exit_unlock: - mutex_unlock(&watchdog.lock); -exit_miscdev: - misc_deregister(&watchdog_miscdev); -exit_reboot: - unregister_reboot_notifier(&watchdog_notifier); + /* + * WATCHDOG_HANDLE_BOOT_ENABLED can result in keepalive being directly + * called without a set_timeout before, so it needs to be done here once + */ + fintek_wdt_set_timeout(wdd, timeout); + fintek_wdt_set_pulse_width(pulse_width); - return err; + return watchdog_register_device(wdd); } static int __init fintek_wdt_find(int sioaddr) @@ -859,12 +578,7 @@ static int __init fintek_wdt_init(void) static void __exit fintek_wdt_exit(void) { - if (fintek_wdt_is_running()) { - pr_warn("Watchdog timer still running, stopping it\n"); - fintek_wdt_stop(); - } - misc_deregister(&watchdog_miscdev); - unregister_reboot_notifier(&watchdog_notifier); + watchdog_unregister_device(&watchdog.wdd); } MODULE_DESCRIPTION("F71808E Watchdog Driver"); From patchwork Thu Feb 4 17:00:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ahmad Fatoum X-Patchwork-Id: 377405 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBB73C433E0 for ; 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Thu, 04 Feb 2021 18:01:31 +0100 From: Ahmad Fatoum To: Wim Van Sebroeck , Guenter Roeck Cc: kernel@pengutronix.de, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, Ahmad Fatoum Subject: [PATCH v3 3/3] watchdog: f71808e_wdt: refactor to platform device/driver pair Date: Thu, 4 Feb 2021 18:00:50 +0100 Message-Id: X-Mailer: git-send-email 2.30.0 In-Reply-To: References: MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: afa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-watchdog@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Driver so far wasn't ported to the driver model and registered the watchdog device out of the init after probing the I/O ports for a watchdog with correct vendor and device revision. Keep the device detection part at init time, but move watchdog registration to a platform driver probe function. Suggested-by: Guenter Roeck Signed-off-by: Ahmad Fatoum --- drivers/watchdog/f71808e_wdt.c | 42 +++++++++++++++++++++++++++++++---- 1 file changed, 38 insertions(+), 4 deletions(-) diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c index 5496d2bb0089..e96f2c274b80 100644 --- a/drivers/watchdog/f71808e_wdt.c +++ b/drivers/watchdog/f71808e_wdt.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #define DRVNAME "f71808e_wdt" @@ -432,10 +433,18 @@ static const struct watchdog_ops fintek_wdt_ops = { .set_timeout = fintek_wdt_set_timeout, }; -static int __init watchdog_init(int sioaddr) +static int fintek_wdt_probe(struct platform_device *pdev) { struct watchdog_device *wdd; int wdt_conf, err = 0; + struct resource *res; + int sioaddr; + + res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (!res) + return -ENXIO; + + sioaddr = res->start; watchdog.sioaddr = sioaddr; watchdog.ident.options = WDIOF_SETTIMEOUT @@ -468,6 +477,7 @@ static int __init watchdog_init(int sioaddr) superio_exit(sioaddr); + wdd->parent = &pdev->dev; wdd->info = &watchdog.ident; wdd->ops = &fintek_wdt_ops; wdd->min_timeout = 1; @@ -488,7 +498,7 @@ static int __init watchdog_init(int sioaddr) fintek_wdt_set_timeout(wdd, timeout); fintek_wdt_set_pulse_width(pulse_width); - return watchdog_register_device(wdd); + return devm_watchdog_register_device(&pdev->dev, wdd); } static int __init fintek_wdt_find(int sioaddr) @@ -554,9 +564,19 @@ static int __init fintek_wdt_find(int sioaddr) return err; } +static struct platform_driver fintek_wdt_driver = { + .probe = fintek_wdt_probe, + .driver = { + .name = DRVNAME, + }, +}; + +static struct platform_device *fintek_wdt_pdev; + static int __init fintek_wdt_init(void) { static const unsigned short addrs[] = { 0x2e, 0x4e }; + struct resource wdt_res = {}; int err = -ENODEV; int i; @@ -573,12 +593,26 @@ static int __init fintek_wdt_init(void) if (i == ARRAY_SIZE(addrs)) return err; - return watchdog_init(addrs[i]); + platform_driver_register(&fintek_wdt_driver); + + wdt_res.name = "superio port"; + wdt_res.flags = IORESOURCE_IO; + wdt_res.start = addrs[i]; + wdt_res.end = addrs[i] + 1; + + fintek_wdt_pdev = platform_device_register_simple(DRVNAME, -1, &wdt_res, 1); + if (IS_ERR(fintek_wdt_pdev)) { + platform_driver_unregister(&fintek_wdt_driver); + return PTR_ERR(fintek_wdt_pdev); + } + + return 0; } static void __exit fintek_wdt_exit(void) { - watchdog_unregister_device(&watchdog.wdd); + platform_device_unregister(fintek_wdt_pdev); + platform_driver_unregister(&fintek_wdt_driver); } MODULE_DESCRIPTION("F71808E Watchdog Driver");