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Linux/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 
 15 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 16 MODULE_DESCRIPTION("TI BQ4802 RTC driver");
 17 MODULE_LICENSE("GPL");
 18 
 19 struct 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 
 29 static u8 bq4802_read_io(struct bq4802 *p, int off)
 30 {
 31         return inb(p->ioport + off);
 32 }
 33 
 34 static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
 35 {
 36         outb(val, p->ioport + off);
 37 }
 38 
 39 static u8 bq4802_read_mem(struct bq4802 *p, int off)
 40 {
 41         return readb(p->regs + off);
 42 }
 43 
 44 static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
 45 {
 46         writeb(val, p->regs + off);
 47 }
 48 
 49 static 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 
 92 static 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 
138 static const struct rtc_class_ops bq4802_ops = {
139         .read_time      = bq4802_read_time,
140         .set_time       = bq4802_set_time,
141 };
142 
143 static int bq4802_probe(struct platform_device *pdev)
144 {
145         struct bq4802 *p = devm_kzalloc(&pdev->dev, 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;
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 = devm_ioremap(&pdev->dev, p->r->start,
166                                         resource_size(p->r));
167                 p->read = bq4802_read_mem;
168                 p->write = bq4802_write_mem;
169         } else {
170                 err = -EINVAL;
171                 goto out;
172         }
173 
174         platform_set_drvdata(pdev, p);
175 
176         p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802",
177                                         &bq4802_ops, THIS_MODULE);
178         if (IS_ERR(p->rtc)) {
179                 err = PTR_ERR(p->rtc);
180                 goto out;
181         }
182 
183         err = 0;
184 out:
185         return err;
186 
187 }
188 
189 /* work with hotplug and coldplug */
190 MODULE_ALIAS("platform:rtc-bq4802");
191 
192 static struct platform_driver bq4802_driver = {
193         .driver         = {
194                 .name   = "rtc-bq4802",
195                 .owner  = THIS_MODULE,
196         },
197         .probe          = bq4802_probe,
198 };
199 
200 module_platform_driver(bq4802_driver);
201 

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