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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) Nokia Corporation
4 *
5 * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
6 */
7
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/kernel.h>
12#include <linux/watchdog.h>
13#include <linux/platform_device.h>
14#include <linux/mfd/twl.h>
15
16#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
17
18static bool nowayout = WATCHDOG_NOWAYOUT;
19module_param(nowayout, bool, 0);
20MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
21 "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
22
23static int twl4030_wdt_write(unsigned char val)
24{
25 return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
26 TWL4030_WATCHDOG_CFG_REG_OFFS);
27}
28
29static int twl4030_wdt_start(struct watchdog_device *wdt)
30{
31 return twl4030_wdt_write(wdt->timeout + 1);
32}
33
34static int twl4030_wdt_stop(struct watchdog_device *wdt)
35{
36 return twl4030_wdt_write(0);
37}
38
39static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
40 unsigned int timeout)
41{
42 wdt->timeout = timeout;
43 return 0;
44}
45
46static const struct watchdog_info twl4030_wdt_info = {
47 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
48 .identity = "TWL4030 Watchdog",
49};
50
51static const struct watchdog_ops twl4030_wdt_ops = {
52 .owner = THIS_MODULE,
53 .start = twl4030_wdt_start,
54 .stop = twl4030_wdt_stop,
55 .set_timeout = twl4030_wdt_set_timeout,
56};
57
58static int twl4030_wdt_probe(struct platform_device *pdev)
59{
60 struct device *dev = &pdev->dev;
61 struct watchdog_device *wdt;
62
63 wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
64 if (!wdt)
65 return -ENOMEM;
66
67 wdt->info = &twl4030_wdt_info;
68 wdt->ops = &twl4030_wdt_ops;
69 wdt->status = 0;
70 wdt->timeout = 30;
71 wdt->min_timeout = 1;
72 wdt->max_timeout = 30;
73 wdt->parent = dev;
74
75 watchdog_set_nowayout(wdt, nowayout);
76 platform_set_drvdata(pdev, wdt);
77
78 twl4030_wdt_stop(wdt);
79
80 return devm_watchdog_register_device(dev, wdt);
81}
82
83#ifdef CONFIG_PM
84static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
85{
86 struct watchdog_device *wdt = platform_get_drvdata(pdev);
87 if (watchdog_active(wdt))
88 return twl4030_wdt_stop(wdt);
89
90 return 0;
91}
92
93static int twl4030_wdt_resume(struct platform_device *pdev)
94{
95 struct watchdog_device *wdt = platform_get_drvdata(pdev);
96 if (watchdog_active(wdt))
97 return twl4030_wdt_start(wdt);
98
99 return 0;
100}
101#else
102#define twl4030_wdt_suspend NULL
103#define twl4030_wdt_resume NULL
104#endif
105
106static const struct of_device_id twl_wdt_of_match[] = {
107 { .compatible = "ti,twl4030-wdt", },
108 { },
109};
110MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
111
112static struct platform_driver twl4030_wdt_driver = {
113 .probe = twl4030_wdt_probe,
114 .suspend = twl4030_wdt_suspend,
115 .resume = twl4030_wdt_resume,
116 .driver = {
117 .name = "twl4030_wdt",
118 .of_match_table = twl_wdt_of_match,
119 },
120};
121
122module_platform_driver(twl4030_wdt_driver);
123
124MODULE_AUTHOR("Nokia Corporation");
125MODULE_LICENSE("GPL");
126MODULE_ALIAS("platform:twl4030_wdt");
127
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/mfd/twl.h>
28
29#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
30
31static bool nowayout = WATCHDOG_NOWAYOUT;
32module_param(nowayout, bool, 0);
33MODULE_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{
38 return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
39 TWL4030_WATCHDOG_CFG_REG_OFFS);
40}
41
42static int twl4030_wdt_start(struct watchdog_device *wdt)
43{
44 return twl4030_wdt_write(wdt->timeout + 1);
45}
46
47static int twl4030_wdt_stop(struct watchdog_device *wdt)
48{
49 return twl4030_wdt_write(0);
50}
51
52static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
53 unsigned int timeout)
54{
55 wdt->timeout = timeout;
56 return 0;
57}
58
59static const struct watchdog_info twl4030_wdt_info = {
60 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
61 .identity = "TWL4030 Watchdog",
62};
63
64static 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
71static 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 wdt->parent = &pdev->dev;
87
88 watchdog_set_nowayout(wdt, nowayout);
89 platform_set_drvdata(pdev, wdt);
90
91 twl4030_wdt_stop(wdt);
92
93 ret = watchdog_register_device(wdt);
94 if (ret)
95 return ret;
96
97 return 0;
98}
99
100static int twl4030_wdt_remove(struct platform_device *pdev)
101{
102 struct watchdog_device *wdt = platform_get_drvdata(pdev);
103
104 watchdog_unregister_device(wdt);
105
106 return 0;
107}
108
109#ifdef CONFIG_PM
110static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
111{
112 struct watchdog_device *wdt = platform_get_drvdata(pdev);
113 if (watchdog_active(wdt))
114 return twl4030_wdt_stop(wdt);
115
116 return 0;
117}
118
119static int twl4030_wdt_resume(struct platform_device *pdev)
120{
121 struct watchdog_device *wdt = platform_get_drvdata(pdev);
122 if (watchdog_active(wdt))
123 return twl4030_wdt_start(wdt);
124
125 return 0;
126}
127#else
128#define twl4030_wdt_suspend NULL
129#define twl4030_wdt_resume NULL
130#endif
131
132static const struct of_device_id twl_wdt_of_match[] = {
133 { .compatible = "ti,twl4030-wdt", },
134 { },
135};
136MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
137
138static struct platform_driver twl4030_wdt_driver = {
139 .probe = twl4030_wdt_probe,
140 .remove = twl4030_wdt_remove,
141 .suspend = twl4030_wdt_suspend,
142 .resume = twl4030_wdt_resume,
143 .driver = {
144 .name = "twl4030_wdt",
145 .of_match_table = twl_wdt_of_match,
146 },
147};
148
149module_platform_driver(twl4030_wdt_driver);
150
151MODULE_AUTHOR("Nokia Corporation");
152MODULE_LICENSE("GPL");
153MODULE_ALIAS("platform:twl4030_wdt");
154