Root/drivers/rtc/rtc-bq4802.c

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#include <linux/slab.h>
14
15MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
16MODULE_DESCRIPTION("TI BQ4802 RTC driver");
17MODULE_LICENSE("GPL");
18
19struct bq4802 {
20    void __iomem *regs;
21    unsigned long ioport;
22    struct rtc_device *rtc;
23    spinlock_t lock;
24    struct resource *r;
25    u8 (*read)(struct bq4802 *, int);
26    void (*write)(struct bq4802 *, int, u8);
27};
28
29static u8 bq4802_read_io(struct bq4802 *p, int off)
30{
31    return inb(p->ioport + off);
32}
33
34static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
35{
36    outb(val, p->ioport + off);
37}
38
39static u8 bq4802_read_mem(struct bq4802 *p, int off)
40{
41    return readb(p->regs + off);
42}
43
44static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
45{
46    writeb(val, p->regs + off);
47}
48
49static int bq4802_read_time(struct device *dev, struct rtc_time *tm)
50{
51    struct platform_device *pdev = to_platform_device(dev);
52    struct bq4802 *p = platform_get_drvdata(pdev);
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
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);
83
84    tm->tm_year += (century * 100);
85    tm->tm_year -= 1900;
86
87    tm->tm_mon--;
88
89    return 0;
90}
91
92static int bq4802_set_time(struct device *dev, struct rtc_time *tm)
93{
94    struct platform_device *pdev = to_platform_device(dev);
95    struct bq4802 *p = platform_get_drvdata(pdev);
96    u8 sec, min, hrs, day, mon, yrs, century, val;
97    unsigned long flags;
98    unsigned int year;
99
100    year = tm->tm_year + 1900;
101    century = year / 100;
102    yrs = year % 100;
103
104    mon = tm->tm_mon + 1; /* tm_mon starts at zero */
105    day = tm->tm_mday;
106    hrs = tm->tm_hour;
107    min = tm->tm_min;
108    sec = tm->tm_sec;
109
110    sec = bin2bcd(sec);
111    min = bin2bcd(min);
112    hrs = bin2bcd(hrs);
113    day = bin2bcd(day);
114    mon = bin2bcd(mon);
115    yrs = bin2bcd(yrs);
116    century = bin2bcd(century);
117
118    spin_lock_irqsave(&p->lock, flags);
119
120    val = p->read(p, 0x0e);
121    p->write(p, 0x0e, val | 0x08);
122
123    p->write(p, 0x00, sec);
124    p->write(p, 0x02, min);
125    p->write(p, 0x04, hrs);
126    p->write(p, 0x06, day);
127    p->write(p, 0x09, mon);
128    p->write(p, 0x0a, yrs);
129    p->write(p, 0x0f, century);
130
131    p->write(p, 0x0e, val);
132
133    spin_unlock_irqrestore(&p->lock, flags);
134
135    return 0;
136}
137
138static const struct rtc_class_ops bq4802_ops = {
139    .read_time = bq4802_read_time,
140    .set_time = bq4802_set_time,
141};
142
143static int __devinit bq4802_probe(struct platform_device *pdev)
144{
145    struct bq4802 *p = kzalloc(sizeof(*p), GFP_KERNEL);
146    int err = -ENOMEM;
147
148    if (!p)
149        goto out;
150
151    spin_lock_init(&p->lock);
152
153    p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
154    if (!p->r) {
155        p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
156        err = -EINVAL;
157        if (!p->r)
158            goto out_free;
159    }
160    if (p->r->flags & IORESOURCE_IO) {
161        p->ioport = p->r->start;
162        p->read = bq4802_read_io;
163        p->write = bq4802_write_io;
164    } else if (p->r->flags & IORESOURCE_MEM) {
165        p->regs = ioremap(p->r->start, resource_size(p->r));
166        p->read = bq4802_read_mem;
167        p->write = bq4802_write_mem;
168    } else {
169        err = -EINVAL;
170        goto out_free;
171    }
172
173    platform_set_drvdata(pdev, p);
174
175    p->rtc = rtc_device_register("bq4802", &pdev->dev,
176                     &bq4802_ops, THIS_MODULE);
177    if (IS_ERR(p->rtc)) {
178        err = PTR_ERR(p->rtc);
179        goto out_iounmap;
180    }
181
182    err = 0;
183out:
184    return err;
185
186out_iounmap:
187    if (p->r->flags & IORESOURCE_MEM)
188        iounmap(p->regs);
189out_free:
190    kfree(p);
191    goto out;
192}
193
194static int __devexit bq4802_remove(struct platform_device *pdev)
195{
196    struct bq4802 *p = platform_get_drvdata(pdev);
197
198    rtc_device_unregister(p->rtc);
199    if (p->r->flags & IORESOURCE_MEM)
200        iounmap(p->regs);
201
202    platform_set_drvdata(pdev, NULL);
203
204    kfree(p);
205
206    return 0;
207}
208
209/* work with hotplug and coldplug */
210MODULE_ALIAS("platform:rtc-bq4802");
211
212static struct platform_driver bq4802_driver = {
213    .driver = {
214        .name = "rtc-bq4802",
215        .owner = THIS_MODULE,
216    },
217    .probe = bq4802_probe,
218    .remove = __devexit_p(bq4802_remove),
219};
220
221module_platform_driver(bq4802_driver);
222

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