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Linux/drivers/watchdog/twl4030_wdt.c

  1 /*
  2  * Copyright (C) Nokia Corporation
  3  *
  4  * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 19  */
 20 
 21 #include <linux/module.h>
 22 #include <linux/types.h>
 23 #include <linux/slab.h>
 24 #include <linux/kernel.h>
 25 #include <linux/watchdog.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/i2c/twl.h>
 28 
 29 #define TWL4030_WATCHDOG_CFG_REG_OFFS   0x3
 30 
 31 static bool nowayout = WATCHDOG_NOWAYOUT;
 32 module_param(nowayout, bool, 0);
 33 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
 34         "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 35 
 36 static int twl4030_wdt_write(unsigned char val)
 37 {
 38         return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
 39                                         TWL4030_WATCHDOG_CFG_REG_OFFS);
 40 }
 41 
 42 static int twl4030_wdt_start(struct watchdog_device *wdt)
 43 {
 44         return twl4030_wdt_write(wdt->timeout + 1);
 45 }
 46 
 47 static int twl4030_wdt_stop(struct watchdog_device *wdt)
 48 {
 49         return twl4030_wdt_write(0);
 50 }
 51 
 52 static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
 53                                    unsigned int timeout)
 54 {
 55         wdt->timeout = timeout;
 56         return 0;
 57 }
 58 
 59 static const struct watchdog_info twl4030_wdt_info = {
 60         .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
 61         .identity = "TWL4030 Watchdog",
 62 };
 63 
 64 static const struct watchdog_ops twl4030_wdt_ops = {
 65         .owner          = THIS_MODULE,
 66         .start          = twl4030_wdt_start,
 67         .stop           = twl4030_wdt_stop,
 68         .set_timeout    = twl4030_wdt_set_timeout,
 69 };
 70 
 71 static int twl4030_wdt_probe(struct platform_device *pdev)
 72 {
 73         int ret = 0;
 74         struct watchdog_device *wdt;
 75 
 76         wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
 77         if (!wdt)
 78                 return -ENOMEM;
 79 
 80         wdt->info               = &twl4030_wdt_info;
 81         wdt->ops                = &twl4030_wdt_ops;
 82         wdt->status             = 0;
 83         wdt->timeout            = 30;
 84         wdt->min_timeout        = 1;
 85         wdt->max_timeout        = 30;
 86 
 87         watchdog_set_nowayout(wdt, nowayout);
 88         platform_set_drvdata(pdev, wdt);
 89 
 90         twl4030_wdt_stop(wdt);
 91 
 92         ret = watchdog_register_device(wdt);
 93         if (ret)
 94                 return ret;
 95 
 96         return 0;
 97 }
 98 
 99 static int twl4030_wdt_remove(struct platform_device *pdev)
100 {
101         struct watchdog_device *wdt = platform_get_drvdata(pdev);
102 
103         watchdog_unregister_device(wdt);
104 
105         return 0;
106 }
107 
108 #ifdef CONFIG_PM
109 static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
110 {
111         struct watchdog_device *wdt = platform_get_drvdata(pdev);
112         if (watchdog_active(wdt))
113                 return twl4030_wdt_stop(wdt);
114 
115         return 0;
116 }
117 
118 static int twl4030_wdt_resume(struct platform_device *pdev)
119 {
120         struct watchdog_device *wdt = platform_get_drvdata(pdev);
121         if (watchdog_active(wdt))
122                 return twl4030_wdt_start(wdt);
123 
124         return 0;
125 }
126 #else
127 #define twl4030_wdt_suspend        NULL
128 #define twl4030_wdt_resume         NULL
129 #endif
130 
131 static const struct of_device_id twl_wdt_of_match[] = {
132         { .compatible = "ti,twl4030-wdt", },
133         { },
134 };
135 MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
136 
137 static struct platform_driver twl4030_wdt_driver = {
138         .probe          = twl4030_wdt_probe,
139         .remove         = twl4030_wdt_remove,
140         .suspend        = twl4030_wdt_suspend,
141         .resume         = twl4030_wdt_resume,
142         .driver         = {
143                 .owner          = THIS_MODULE,
144                 .name           = "twl4030_wdt",
145                 .of_match_table = twl_wdt_of_match,
146         },
147 };
148 
149 module_platform_driver(twl4030_wdt_driver);
150 
151 MODULE_AUTHOR("Nokia Corporation");
152 MODULE_LICENSE("GPL");
153 MODULE_ALIAS("platform:twl4030_wdt");
154 
155 

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