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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
cca4c231 DM |
2 | /* rtc-bq4802.c: TI BQ4802 RTC driver. |
3 | * | |
4 | * Copyright (C) 2008 David S. Miller <davem@davemloft.net> | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/io.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/rtc.h> | |
13 | #include <linux/bcd.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
cca4c231 DM |
15 | |
16 | MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); | |
17 | MODULE_DESCRIPTION("TI BQ4802 RTC driver"); | |
18 | MODULE_LICENSE("GPL"); | |
19 | ||
20 | struct bq4802 { | |
21 | void __iomem *regs; | |
503acc8a | 22 | unsigned long ioport; |
cca4c231 DM |
23 | struct rtc_device *rtc; |
24 | spinlock_t lock; | |
25 | struct resource *r; | |
26 | u8 (*read)(struct bq4802 *, int); | |
27 | void (*write)(struct bq4802 *, int, u8); | |
28 | }; | |
29 | ||
30 | static u8 bq4802_read_io(struct bq4802 *p, int off) | |
31 | { | |
503acc8a | 32 | return inb(p->ioport + off); |
cca4c231 DM |
33 | } |
34 | ||
35 | static void bq4802_write_io(struct bq4802 *p, int off, u8 val) | |
36 | { | |
503acc8a | 37 | outb(val, p->ioport + off); |
cca4c231 DM |
38 | } |
39 | ||
40 | static u8 bq4802_read_mem(struct bq4802 *p, int off) | |
41 | { | |
42 | return readb(p->regs + off); | |
43 | } | |
44 | ||
45 | static void bq4802_write_mem(struct bq4802 *p, int off, u8 val) | |
46 | { | |
503acc8a | 47 | writeb(val, p->regs + off); |
cca4c231 DM |
48 | } |
49 | ||
50 | static int bq4802_read_time(struct device *dev, struct rtc_time *tm) | |
51 | { | |
85368bb9 | 52 | struct bq4802 *p = dev_get_drvdata(dev); |
cca4c231 DM |
53 | unsigned long flags; |
54 | unsigned int century; | |
55 | u8 val; | |
56 | ||
57 | spin_lock_irqsave(&p->lock, flags); | |
58 | ||
59 | val = p->read(p, 0x0e); | |
60 | p->write(p, 0xe, val | 0x08); | |
61 | ||
62 | tm->tm_sec = p->read(p, 0x00); | |
63 | tm->tm_min = p->read(p, 0x02); | |
64 | tm->tm_hour = p->read(p, 0x04); | |
65 | tm->tm_mday = p->read(p, 0x06); | |
66 | tm->tm_mon = p->read(p, 0x09); | |
67 | tm->tm_year = p->read(p, 0x0a); | |
68 | tm->tm_wday = p->read(p, 0x08); | |
69 | century = p->read(p, 0x0f); | |
70 | ||
71 | p->write(p, 0x0e, val); | |
72 | ||
73 | spin_unlock_irqrestore(&p->lock, flags); | |
74 | ||
e232cfdc AM |
75 | tm->tm_sec = bcd2bin(tm->tm_sec); |
76 | tm->tm_min = bcd2bin(tm->tm_min); | |
77 | tm->tm_hour = bcd2bin(tm->tm_hour); | |
78 | tm->tm_mday = bcd2bin(tm->tm_mday); | |
79 | tm->tm_mon = bcd2bin(tm->tm_mon); | |
80 | tm->tm_year = bcd2bin(tm->tm_year); | |
81 | tm->tm_wday = bcd2bin(tm->tm_wday); | |
82 | century = bcd2bin(century); | |
cca4c231 DM |
83 | |
84 | tm->tm_year += (century * 100); | |
85 | tm->tm_year -= 1900; | |
86 | ||
87 | tm->tm_mon--; | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static int bq4802_set_time(struct device *dev, struct rtc_time *tm) | |
93 | { | |
85368bb9 | 94 | struct bq4802 *p = dev_get_drvdata(dev); |
cca4c231 DM |
95 | u8 sec, min, hrs, day, mon, yrs, century, val; |
96 | unsigned long flags; | |
97 | unsigned int year; | |
98 | ||
99 | year = tm->tm_year + 1900; | |
100 | century = year / 100; | |
101 | yrs = year % 100; | |
102 | ||
103 | mon = tm->tm_mon + 1; /* tm_mon starts at zero */ | |
104 | day = tm->tm_mday; | |
105 | hrs = tm->tm_hour; | |
106 | min = tm->tm_min; | |
107 | sec = tm->tm_sec; | |
108 | ||
e232cfdc AM |
109 | sec = bin2bcd(sec); |
110 | min = bin2bcd(min); | |
111 | hrs = bin2bcd(hrs); | |
112 | day = bin2bcd(day); | |
113 | mon = bin2bcd(mon); | |
114 | yrs = bin2bcd(yrs); | |
115 | century = bin2bcd(century); | |
cca4c231 DM |
116 | |
117 | spin_lock_irqsave(&p->lock, flags); | |
118 | ||
119 | val = p->read(p, 0x0e); | |
120 | p->write(p, 0x0e, val | 0x08); | |
121 | ||
122 | p->write(p, 0x00, sec); | |
123 | p->write(p, 0x02, min); | |
124 | p->write(p, 0x04, hrs); | |
125 | p->write(p, 0x06, day); | |
126 | p->write(p, 0x09, mon); | |
127 | p->write(p, 0x0a, yrs); | |
128 | p->write(p, 0x0f, century); | |
129 | ||
130 | p->write(p, 0x0e, val); | |
131 | ||
132 | spin_unlock_irqrestore(&p->lock, flags); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static const struct rtc_class_ops bq4802_ops = { | |
138 | .read_time = bq4802_read_time, | |
139 | .set_time = bq4802_set_time, | |
140 | }; | |
141 | ||
5a167f45 | 142 | static int bq4802_probe(struct platform_device *pdev) |
cca4c231 | 143 | { |
26c5f7d9 | 144 | struct bq4802 *p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL); |
cca4c231 DM |
145 | int err = -ENOMEM; |
146 | ||
147 | if (!p) | |
148 | goto out; | |
149 | ||
150 | spin_lock_init(&p->lock); | |
151 | ||
152 | p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
153 | if (!p->r) { | |
154 | p->r = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
155 | err = -EINVAL; | |
156 | if (!p->r) | |
26c5f7d9 | 157 | goto out; |
cca4c231 DM |
158 | } |
159 | if (p->r->flags & IORESOURCE_IO) { | |
503acc8a | 160 | p->ioport = p->r->start; |
cca4c231 DM |
161 | p->read = bq4802_read_io; |
162 | p->write = bq4802_write_io; | |
163 | } else if (p->r->flags & IORESOURCE_MEM) { | |
26c5f7d9 JH |
164 | p->regs = devm_ioremap(&pdev->dev, p->r->start, |
165 | resource_size(p->r)); | |
7874b919 ZJ |
166 | if (!p->regs){ |
167 | err = -ENOMEM; | |
168 | goto out; | |
169 | } | |
cca4c231 DM |
170 | p->read = bq4802_read_mem; |
171 | p->write = bq4802_write_mem; | |
172 | } else { | |
173 | err = -EINVAL; | |
26c5f7d9 | 174 | goto out; |
cca4c231 DM |
175 | } |
176 | ||
b74d2caa AZ |
177 | platform_set_drvdata(pdev, p); |
178 | ||
26c5f7d9 JH |
179 | p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802", |
180 | &bq4802_ops, THIS_MODULE); | |
cca4c231 DM |
181 | if (IS_ERR(p->rtc)) { |
182 | err = PTR_ERR(p->rtc); | |
26c5f7d9 | 183 | goto out; |
cca4c231 DM |
184 | } |
185 | ||
cca4c231 DM |
186 | err = 0; |
187 | out: | |
188 | return err; | |
189 | ||
cca4c231 DM |
190 | } |
191 | ||
cca4c231 DM |
192 | /* work with hotplug and coldplug */ |
193 | MODULE_ALIAS("platform:rtc-bq4802"); | |
194 | ||
195 | static struct platform_driver bq4802_driver = { | |
196 | .driver = { | |
197 | .name = "rtc-bq4802", | |
cca4c231 DM |
198 | }, |
199 | .probe = bq4802_probe, | |
cca4c231 DM |
200 | }; |
201 | ||
0c4eae66 | 202 | module_platform_driver(bq4802_driver); |