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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/mod_devicetable.h>
13#include <linux/watchdog.h>
14#include <linux/platform_device.h>
15#include <linux/mfd/twl.h>
16
17#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
18
19static bool nowayout = WATCHDOG_NOWAYOUT;
20module_param(nowayout, bool, 0);
21MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
22 "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
23
24static int twl4030_wdt_write(unsigned char val)
25{
26 return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
27 TWL4030_WATCHDOG_CFG_REG_OFFS);
28}
29
30static int twl4030_wdt_start(struct watchdog_device *wdt)
31{
32 return twl4030_wdt_write(wdt->timeout + 1);
33}
34
35static int twl4030_wdt_stop(struct watchdog_device *wdt)
36{
37 return twl4030_wdt_write(0);
38}
39
40static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
41 unsigned int timeout)
42{
43 wdt->timeout = timeout;
44 return 0;
45}
46
47static const struct watchdog_info twl4030_wdt_info = {
48 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
49 .identity = "TWL4030 Watchdog",
50};
51
52static const struct watchdog_ops twl4030_wdt_ops = {
53 .owner = THIS_MODULE,
54 .start = twl4030_wdt_start,
55 .stop = twl4030_wdt_stop,
56 .set_timeout = twl4030_wdt_set_timeout,
57};
58
59static int twl4030_wdt_probe(struct platform_device *pdev)
60{
61 struct device *dev = &pdev->dev;
62 struct watchdog_device *wdt;
63
64 wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
65 if (!wdt)
66 return -ENOMEM;
67
68 wdt->info = &twl4030_wdt_info;
69 wdt->ops = &twl4030_wdt_ops;
70 wdt->status = 0;
71 wdt->timeout = 30;
72 wdt->min_timeout = 1;
73 wdt->max_timeout = 30;
74 wdt->parent = dev;
75
76 watchdog_set_nowayout(wdt, nowayout);
77 platform_set_drvdata(pdev, wdt);
78
79 twl4030_wdt_stop(wdt);
80
81 return devm_watchdog_register_device(dev, wdt);
82}
83
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
102static const struct of_device_id twl_wdt_of_match[] = {
103 { .compatible = "ti,twl4030-wdt", },
104 { },
105};
106MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
107
108static struct platform_driver twl4030_wdt_driver = {
109 .probe = twl4030_wdt_probe,
110 .suspend = pm_ptr(twl4030_wdt_suspend),
111 .resume = pm_ptr(twl4030_wdt_resume),
112 .driver = {
113 .name = "twl4030_wdt",
114 .of_match_table = twl_wdt_of_match,
115 },
116};
117
118module_platform_driver(twl4030_wdt_driver);
119
120MODULE_AUTHOR("Nokia Corporation");
121MODULE_LICENSE("GPL");
122MODULE_ALIAS("platform:twl4030_wdt");
123
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
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_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
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
99static 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
109static 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
118static 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
131static const struct of_device_id twl_wdt_of_match[] = {
132 { .compatible = "ti,twl4030-wdt", },
133 { },
134};
135MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
136
137static 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
149module_platform_driver(twl4030_wdt_driver);
150
151MODULE_AUTHOR("Nokia Corporation");
152MODULE_LICENSE("GPL");
153MODULE_ALIAS("platform:twl4030_wdt");
154