| /* |
| * Copyright (C) Nokia Corporation |
| * |
| * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com> |
| * |
| * 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; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/watchdog.h> |
| #include <linux/platform_device.h> |
| #include <linux/i2c/twl.h> |
| |
| #define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3 |
| |
| 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 int twl4030_wdt_write(unsigned char val) |
| { |
| return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val, |
| TWL4030_WATCHDOG_CFG_REG_OFFS); |
| } |
| |
| static int twl4030_wdt_start(struct watchdog_device *wdt) |
| { |
| return twl4030_wdt_write(wdt->timeout + 1); |
| } |
| |
| static int twl4030_wdt_stop(struct watchdog_device *wdt) |
| { |
| return twl4030_wdt_write(0); |
| } |
| |
| static int twl4030_wdt_set_timeout(struct watchdog_device *wdt, |
| unsigned int timeout) |
| { |
| wdt->timeout = timeout; |
| return 0; |
| } |
| |
| static const struct watchdog_info twl4030_wdt_info = { |
| .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, |
| .identity = "TWL4030 Watchdog", |
| }; |
| |
| static const struct watchdog_ops twl4030_wdt_ops = { |
| .owner = THIS_MODULE, |
| .start = twl4030_wdt_start, |
| .stop = twl4030_wdt_stop, |
| .set_timeout = twl4030_wdt_set_timeout, |
| }; |
| |
| static int twl4030_wdt_probe(struct platform_device *pdev) |
| { |
| int ret = 0; |
| struct watchdog_device *wdt; |
| |
| wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); |
| if (!wdt) |
| return -ENOMEM; |
| |
| wdt->info = &twl4030_wdt_info; |
| wdt->ops = &twl4030_wdt_ops; |
| wdt->status = 0; |
| wdt->timeout = 30; |
| wdt->min_timeout = 1; |
| wdt->max_timeout = 30; |
| |
| watchdog_set_nowayout(wdt, nowayout); |
| platform_set_drvdata(pdev, wdt); |
| |
| twl4030_wdt_stop(wdt); |
| |
| ret = watchdog_register_device(wdt); |
| if (ret) { |
| platform_set_drvdata(pdev, NULL); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int twl4030_wdt_remove(struct platform_device *pdev) |
| { |
| struct watchdog_device *wdt = platform_get_drvdata(pdev); |
| |
| watchdog_unregister_device(wdt); |
| platform_set_drvdata(pdev, NULL); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state) |
| { |
| struct watchdog_device *wdt = platform_get_drvdata(pdev); |
| if (watchdog_active(wdt)) |
| return twl4030_wdt_stop(wdt); |
| |
| return 0; |
| } |
| |
| static int twl4030_wdt_resume(struct platform_device *pdev) |
| { |
| struct watchdog_device *wdt = platform_get_drvdata(pdev); |
| if (watchdog_active(wdt)) |
| return twl4030_wdt_start(wdt); |
| |
| return 0; |
| } |
| #else |
| #define twl4030_wdt_suspend NULL |
| #define twl4030_wdt_resume NULL |
| #endif |
| |
| static const struct of_device_id twl_wdt_of_match[] = { |
| { .compatible = "ti,twl4030-wdt", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, twl_wdt_of_match); |
| |
| static struct platform_driver twl4030_wdt_driver = { |
| .probe = twl4030_wdt_probe, |
| .remove = twl4030_wdt_remove, |
| .suspend = twl4030_wdt_suspend, |
| .resume = twl4030_wdt_resume, |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "twl4030_wdt", |
| .of_match_table = twl_wdt_of_match, |
| }, |
| }; |
| |
| module_platform_driver(twl4030_wdt_driver); |
| |
| MODULE_AUTHOR("Nokia Corporation"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:twl4030_wdt"); |
| |