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Timo Kokkonen80e45b12009-03-27 16:42:17 +02001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Timo Kokkonen80e45b12009-03-27 16:42:17 +020024#include <linux/kernel.h>
Timo Kokkonen80e45b12009-03-27 16:42:17 +020025#include <linux/watchdog.h>
26#include <linux/platform_device.h>
Santosh Shilimkarb07682b2009-12-13 20:05:51 +010027#include <linux/i2c/twl.h>
Timo Kokkonen80e45b12009-03-27 16:42:17 +020028
29#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
30
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010031static bool nowayout = WATCHDOG_NOWAYOUT;
32module_param(nowayout, bool, 0);
Timo Kokkonen80e45b12009-03-27 16:42:17 +020033MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
34 "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
35
36static int twl4030_wdt_write(unsigned char val)
37{
Peter Ujfalusi2bc3f622012-11-13 10:40:22 +010038 return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
Timo Kokkonen80e45b12009-03-27 16:42:17 +020039 TWL4030_WATCHDOG_CFG_REG_OFFS);
40}
41
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030042static int twl4030_wdt_start(struct watchdog_device *wdt)
Timo Kokkonen80e45b12009-03-27 16:42:17 +020043{
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030044 return twl4030_wdt_write(wdt->timeout + 1);
Timo Kokkonen80e45b12009-03-27 16:42:17 +020045}
46
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030047static int twl4030_wdt_stop(struct watchdog_device *wdt)
Timo Kokkonen80e45b12009-03-27 16:42:17 +020048{
49 return twl4030_wdt_write(0);
50}
51
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030052static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
53 unsigned int timeout)
Timo Kokkonen80e45b12009-03-27 16:42:17 +020054{
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030055 wdt->timeout = timeout;
Timo Kokkonen80e45b12009-03-27 16:42:17 +020056 return 0;
57}
58
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030059static const struct watchdog_info twl4030_wdt_info = {
60 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
61 .identity = "TWL4030 Watchdog",
62};
Timo Kokkonen80e45b12009-03-27 16:42:17 +020063
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030064static const struct watchdog_ops twl4030_wdt_ops = {
Timo Kokkonen80e45b12009-03-27 16:42:17 +020065 .owner = THIS_MODULE,
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030066 .start = twl4030_wdt_start,
67 .stop = twl4030_wdt_stop,
68 .set_timeout = twl4030_wdt_set_timeout,
Timo Kokkonen80e45b12009-03-27 16:42:17 +020069};
70
Bill Pemberton2d991a12012-11-19 13:21:41 -050071static int twl4030_wdt_probe(struct platform_device *pdev)
Timo Kokkonen80e45b12009-03-27 16:42:17 +020072{
73 int ret = 0;
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030074 struct watchdog_device *wdt;
Timo Kokkonen80e45b12009-03-27 16:42:17 +020075
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030076 wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
Timo Kokkonen80e45b12009-03-27 16:42:17 +020077 if (!wdt)
78 return -ENOMEM;
79
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030080 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;
Timo Kokkonen80e45b12009-03-27 16:42:17 +020086
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030087 watchdog_set_nowayout(wdt, nowayout);
Timo Kokkonen80e45b12009-03-27 16:42:17 +020088 platform_set_drvdata(pdev, wdt);
89
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030090 twl4030_wdt_stop(wdt);
Timo Kokkonen80e45b12009-03-27 16:42:17 +020091
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030092 ret = watchdog_register_device(wdt);
Timo Kokkonen80e45b12009-03-27 16:42:17 +020093 if (ret) {
Timo Kokkonen80e45b12009-03-27 16:42:17 +020094 platform_set_drvdata(pdev, NULL);
Timo Kokkonen80e45b12009-03-27 16:42:17 +020095 return ret;
96 }
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +030097
Timo Kokkonen80e45b12009-03-27 16:42:17 +020098 return 0;
99}
100
Bill Pemberton4b12b892012-11-19 13:26:24 -0500101static int twl4030_wdt_remove(struct platform_device *pdev)
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200102{
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +0300103 struct watchdog_device *wdt = platform_get_drvdata(pdev);
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200104
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +0300105 watchdog_unregister_device(wdt);
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200106 platform_set_drvdata(pdev, NULL);
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200107
108 return 0;
109}
110
111#ifdef CONFIG_PM
112static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
113{
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +0300114 struct watchdog_device *wdt = platform_get_drvdata(pdev);
115 if (watchdog_active(wdt))
116 return twl4030_wdt_stop(wdt);
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200117
118 return 0;
119}
120
121static int twl4030_wdt_resume(struct platform_device *pdev)
122{
Jarkko Nikulab2c4e4b2012-09-11 09:01:10 +0300123 struct watchdog_device *wdt = platform_get_drvdata(pdev);
124 if (watchdog_active(wdt))
125 return twl4030_wdt_start(wdt);
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200126
127 return 0;
128}
129#else
130#define twl4030_wdt_suspend NULL
131#define twl4030_wdt_resume NULL
132#endif
133
Aaro Koskinen8899b8d2012-12-23 22:03:37 +0200134static const struct of_device_id twl_wdt_of_match[] = {
135 { .compatible = "ti,twl4030-wdt", },
136 { },
137};
138MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
139
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200140static struct platform_driver twl4030_wdt_driver = {
141 .probe = twl4030_wdt_probe,
Bill Pemberton82268712012-11-19 13:21:12 -0500142 .remove = twl4030_wdt_remove,
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200143 .suspend = twl4030_wdt_suspend,
144 .resume = twl4030_wdt_resume,
145 .driver = {
Aaro Koskinen8899b8d2012-12-23 22:03:37 +0200146 .owner = THIS_MODULE,
147 .name = "twl4030_wdt",
148 .of_match_table = twl_wdt_of_match,
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200149 },
150};
151
Axel Linb8ec6112011-11-29 13:56:27 +0800152module_platform_driver(twl4030_wdt_driver);
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200153
154MODULE_AUTHOR("Nokia Corporation");
155MODULE_LICENSE("GPL");
Timo Kokkonen80e45b12009-03-27 16:42:17 +0200156MODULE_ALIAS("platform:twl4030_wdt");
157