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cca4c231 DM |
1 | /* rtc-bq4802.c: TI BQ4802 RTC driver. |
2 | * | |
3 | * Copyright (C) 2008 David S. Miller <davem@davemloft.net> | |
4 | */ | |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/io.h> | |
10 | #include <linux/platform_device.h> | |
11 | #include <linux/rtc.h> | |
12 | #include <linux/bcd.h> | |
13 | ||
14 | MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); | |
15 | MODULE_DESCRIPTION("TI BQ4802 RTC driver"); | |
16 | MODULE_LICENSE("GPL"); | |
17 | ||
18 | struct bq4802 { | |
19 | void __iomem *regs; | |
503acc8a | 20 | unsigned long ioport; |
cca4c231 DM |
21 | struct rtc_device *rtc; |
22 | spinlock_t lock; | |
23 | struct resource *r; | |
24 | u8 (*read)(struct bq4802 *, int); | |
25 | void (*write)(struct bq4802 *, int, u8); | |
26 | }; | |
27 | ||
28 | static u8 bq4802_read_io(struct bq4802 *p, int off) | |
29 | { | |
503acc8a | 30 | return inb(p->ioport + off); |
cca4c231 DM |
31 | } |
32 | ||
33 | static void bq4802_write_io(struct bq4802 *p, int off, u8 val) | |
34 | { | |
503acc8a | 35 | outb(val, p->ioport + off); |
cca4c231 DM |
36 | } |
37 | ||
38 | static u8 bq4802_read_mem(struct bq4802 *p, int off) | |
39 | { | |
40 | return readb(p->regs + off); | |
41 | } | |
42 | ||
43 | static void bq4802_write_mem(struct bq4802 *p, int off, u8 val) | |
44 | { | |
503acc8a | 45 | writeb(val, p->regs + off); |
cca4c231 DM |
46 | } |
47 | ||
48 | static int bq4802_read_time(struct device *dev, struct rtc_time *tm) | |
49 | { | |
50 | struct platform_device *pdev = to_platform_device(dev); | |
51 | struct bq4802 *p = platform_get_drvdata(pdev); | |
52 | unsigned long flags; | |
53 | unsigned int century; | |
54 | u8 val; | |
55 | ||
56 | spin_lock_irqsave(&p->lock, flags); | |
57 | ||
58 | val = p->read(p, 0x0e); | |
59 | p->write(p, 0xe, val | 0x08); | |
60 | ||
61 | tm->tm_sec = p->read(p, 0x00); | |
62 | tm->tm_min = p->read(p, 0x02); | |
63 | tm->tm_hour = p->read(p, 0x04); | |
64 | tm->tm_mday = p->read(p, 0x06); | |
65 | tm->tm_mon = p->read(p, 0x09); | |
66 | tm->tm_year = p->read(p, 0x0a); | |
67 | tm->tm_wday = p->read(p, 0x08); | |
68 | century = p->read(p, 0x0f); | |
69 | ||
70 | p->write(p, 0x0e, val); | |
71 | ||
72 | spin_unlock_irqrestore(&p->lock, flags); | |
73 | ||
e232cfdc AM |
74 | tm->tm_sec = bcd2bin(tm->tm_sec); |
75 | tm->tm_min = bcd2bin(tm->tm_min); | |
76 | tm->tm_hour = bcd2bin(tm->tm_hour); | |
77 | tm->tm_mday = bcd2bin(tm->tm_mday); | |
78 | tm->tm_mon = bcd2bin(tm->tm_mon); | |
79 | tm->tm_year = bcd2bin(tm->tm_year); | |
80 | tm->tm_wday = bcd2bin(tm->tm_wday); | |
81 | century = bcd2bin(century); | |
cca4c231 DM |
82 | |
83 | tm->tm_year += (century * 100); | |
84 | tm->tm_year -= 1900; | |
85 | ||
86 | tm->tm_mon--; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int bq4802_set_time(struct device *dev, struct rtc_time *tm) | |
92 | { | |
93 | struct platform_device *pdev = to_platform_device(dev); | |
94 | struct bq4802 *p = platform_get_drvdata(pdev); | |
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 | ||
142 | static int __devinit bq4802_probe(struct platform_device *pdev) | |
143 | { | |
144 | struct bq4802 *p = kzalloc(sizeof(*p), GFP_KERNEL); | |
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) | |
157 | goto out_free; | |
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) { | |
164 | p->regs = ioremap(p->r->start, resource_size(p->r)); | |
165 | p->read = bq4802_read_mem; | |
166 | p->write = bq4802_write_mem; | |
167 | } else { | |
168 | err = -EINVAL; | |
169 | goto out_free; | |
170 | } | |
171 | ||
172 | p->rtc = rtc_device_register("bq4802", &pdev->dev, | |
173 | &bq4802_ops, THIS_MODULE); | |
174 | if (IS_ERR(p->rtc)) { | |
175 | err = PTR_ERR(p->rtc); | |
176 | goto out_iounmap; | |
177 | } | |
178 | ||
179 | platform_set_drvdata(pdev, p); | |
180 | err = 0; | |
181 | out: | |
182 | return err; | |
183 | ||
184 | out_iounmap: | |
185 | if (p->r->flags & IORESOURCE_MEM) | |
186 | iounmap(p->regs); | |
187 | out_free: | |
188 | kfree(p); | |
189 | goto out; | |
190 | } | |
191 | ||
192 | static int __devexit bq4802_remove(struct platform_device *pdev) | |
193 | { | |
194 | struct bq4802 *p = platform_get_drvdata(pdev); | |
195 | ||
196 | rtc_device_unregister(p->rtc); | |
197 | if (p->r->flags & IORESOURCE_MEM) | |
198 | iounmap(p->regs); | |
199 | ||
200 | platform_set_drvdata(pdev, NULL); | |
201 | ||
202 | kfree(p); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | /* work with hotplug and coldplug */ | |
208 | MODULE_ALIAS("platform:rtc-bq4802"); | |
209 | ||
210 | static struct platform_driver bq4802_driver = { | |
211 | .driver = { | |
212 | .name = "rtc-bq4802", | |
213 | .owner = THIS_MODULE, | |
214 | }, | |
215 | .probe = bq4802_probe, | |
216 | .remove = __devexit_p(bq4802_remove), | |
217 | }; | |
218 | ||
219 | static int __init bq4802_init(void) | |
220 | { | |
221 | return platform_driver_register(&bq4802_driver); | |
222 | } | |
223 | ||
224 | static void __exit bq4802_exit(void) | |
225 | { | |
226 | platform_driver_unregister(&bq4802_driver); | |
227 | } | |
228 | ||
229 | module_init(bq4802_init); | |
230 | module_exit(bq4802_exit); |