Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
80e45b1e TK |
2 | /* |
3 | * Copyright (C) Nokia Corporation | |
4 | * | |
5 | * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com> | |
80e45b1e TK |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/types.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
80e45b1e | 11 | #include <linux/kernel.h> |
099d387e | 12 | #include <linux/mod_devicetable.h> |
80e45b1e TK |
13 | #include <linux/watchdog.h> |
14 | #include <linux/platform_device.h> | |
a2054256 | 15 | #include <linux/mfd/twl.h> |
80e45b1e TK |
16 | |
17 | #define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3 | |
18 | ||
86a1e189 WVS |
19 | static bool nowayout = WATCHDOG_NOWAYOUT; |
20 | module_param(nowayout, bool, 0); | |
80e45b1e TK |
21 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
22 | "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
23 | ||
24 | static int twl4030_wdt_write(unsigned char val) | |
25 | { | |
2bc3f62f | 26 | return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val, |
80e45b1e TK |
27 | TWL4030_WATCHDOG_CFG_REG_OFFS); |
28 | } | |
29 | ||
b2c4e4b2 | 30 | static int twl4030_wdt_start(struct watchdog_device *wdt) |
80e45b1e | 31 | { |
b2c4e4b2 | 32 | return twl4030_wdt_write(wdt->timeout + 1); |
80e45b1e TK |
33 | } |
34 | ||
b2c4e4b2 | 35 | static int twl4030_wdt_stop(struct watchdog_device *wdt) |
80e45b1e TK |
36 | { |
37 | return twl4030_wdt_write(0); | |
38 | } | |
39 | ||
b2c4e4b2 JN |
40 | static int twl4030_wdt_set_timeout(struct watchdog_device *wdt, |
41 | unsigned int timeout) | |
80e45b1e | 42 | { |
b2c4e4b2 | 43 | wdt->timeout = timeout; |
80e45b1e TK |
44 | return 0; |
45 | } | |
46 | ||
b2c4e4b2 | 47 | static const struct watchdog_info twl4030_wdt_info = { |
fb1cbeae | 48 | .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, |
b2c4e4b2 JN |
49 | .identity = "TWL4030 Watchdog", |
50 | }; | |
80e45b1e | 51 | |
b2c4e4b2 | 52 | static const struct watchdog_ops twl4030_wdt_ops = { |
80e45b1e | 53 | .owner = THIS_MODULE, |
b2c4e4b2 JN |
54 | .start = twl4030_wdt_start, |
55 | .stop = twl4030_wdt_stop, | |
56 | .set_timeout = twl4030_wdt_set_timeout, | |
80e45b1e TK |
57 | }; |
58 | ||
2d991a16 | 59 | static int twl4030_wdt_probe(struct platform_device *pdev) |
80e45b1e | 60 | { |
b42488bc | 61 | struct device *dev = &pdev->dev; |
b2c4e4b2 | 62 | struct watchdog_device *wdt; |
80e45b1e | 63 | |
b42488bc | 64 | wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); |
80e45b1e TK |
65 | if (!wdt) |
66 | return -ENOMEM; | |
67 | ||
b2c4e4b2 JN |
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; | |
b42488bc | 74 | wdt->parent = dev; |
80e45b1e | 75 | |
b2c4e4b2 | 76 | watchdog_set_nowayout(wdt, nowayout); |
80e45b1e TK |
77 | platform_set_drvdata(pdev, wdt); |
78 | ||
b2c4e4b2 | 79 | twl4030_wdt_stop(wdt); |
80e45b1e | 80 | |
b42488bc | 81 | return devm_watchdog_register_device(dev, wdt); |
80e45b1e TK |
82 | } |
83 | ||
80e45b1e TK |
84 | static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state) |
85 | { | |
b2c4e4b2 JN |
86 | struct watchdog_device *wdt = platform_get_drvdata(pdev); |
87 | if (watchdog_active(wdt)) | |
88 | return twl4030_wdt_stop(wdt); | |
80e45b1e TK |
89 | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static int twl4030_wdt_resume(struct platform_device *pdev) | |
94 | { | |
b2c4e4b2 JN |
95 | struct watchdog_device *wdt = platform_get_drvdata(pdev); |
96 | if (watchdog_active(wdt)) | |
97 | return twl4030_wdt_start(wdt); | |
80e45b1e TK |
98 | |
99 | return 0; | |
100 | } | |
80e45b1e | 101 | |
8899b8d9 AK |
102 | static const struct of_device_id twl_wdt_of_match[] = { |
103 | { .compatible = "ti,twl4030-wdt", }, | |
104 | { }, | |
105 | }; | |
106 | MODULE_DEVICE_TABLE(of, twl_wdt_of_match); | |
107 | ||
80e45b1e TK |
108 | static struct platform_driver twl4030_wdt_driver = { |
109 | .probe = twl4030_wdt_probe, | |
d36eda79 PC |
110 | .suspend = pm_ptr(twl4030_wdt_suspend), |
111 | .resume = pm_ptr(twl4030_wdt_resume), | |
80e45b1e | 112 | .driver = { |
8899b8d9 AK |
113 | .name = "twl4030_wdt", |
114 | .of_match_table = twl_wdt_of_match, | |
80e45b1e TK |
115 | }, |
116 | }; | |
117 | ||
b8ec6118 | 118 | module_platform_driver(twl4030_wdt_driver); |
80e45b1e TK |
119 | |
120 | MODULE_AUTHOR("Nokia Corporation"); | |
121 | MODULE_LICENSE("GPL"); | |
80e45b1e TK |
122 | MODULE_ALIAS("platform:twl4030_wdt"); |
123 |