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@@ -0,0 +1,229 @@
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+/* rtc-bq4802.c: TI BQ4802 RTC driver.
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+ *
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+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/io.h>
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+#include <linux/platform_device.h>
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+#include <linux/rtc.h>
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+#include <linux/bcd.h>
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+
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+MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
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+MODULE_DESCRIPTION("TI BQ4802 RTC driver");
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+MODULE_LICENSE("GPL");
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+
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+struct bq4802 {
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+ void __iomem *regs;
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+ struct rtc_device *rtc;
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+ spinlock_t lock;
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+ struct resource *r;
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+ u8 (*read)(struct bq4802 *, int);
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+ void (*write)(struct bq4802 *, int, u8);
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+};
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+
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+static u8 bq4802_read_io(struct bq4802 *p, int off)
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+{
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+ return inb(p->regs + off);
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+}
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+
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+static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
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+{
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+ return outb(val, p->regs + off);
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+}
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+
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+static u8 bq4802_read_mem(struct bq4802 *p, int off)
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+{
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+ return readb(p->regs + off);
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+}
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+
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+static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
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+{
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+ return writeb(val, p->regs + off);
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+}
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+
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+static int bq4802_read_time(struct device *dev, struct rtc_time *tm)
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+{
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+ struct platform_device *pdev = to_platform_device(dev);
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+ struct bq4802 *p = platform_get_drvdata(pdev);
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+ unsigned long flags;
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+ unsigned int century;
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+ u8 val;
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+
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+ spin_lock_irqsave(&p->lock, flags);
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+
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+ val = p->read(p, 0x0e);
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+ p->write(p, 0xe, val | 0x08);
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+
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+ tm->tm_sec = p->read(p, 0x00);
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+ tm->tm_min = p->read(p, 0x02);
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+ tm->tm_hour = p->read(p, 0x04);
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+ tm->tm_mday = p->read(p, 0x06);
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+ tm->tm_mon = p->read(p, 0x09);
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+ tm->tm_year = p->read(p, 0x0a);
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+ tm->tm_wday = p->read(p, 0x08);
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+ century = p->read(p, 0x0f);
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+
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+ p->write(p, 0x0e, val);
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+
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+ spin_unlock_irqrestore(&p->lock, flags);
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+
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+ BCD_TO_BIN(tm->tm_sec);
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+ BCD_TO_BIN(tm->tm_min);
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+ BCD_TO_BIN(tm->tm_hour);
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+ BCD_TO_BIN(tm->tm_mday);
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+ BCD_TO_BIN(tm->tm_mon);
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+ BCD_TO_BIN(tm->tm_year);
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+ BCD_TO_BIN(tm->tm_wday);
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+ BCD_TO_BIN(century);
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+
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+ tm->tm_year += (century * 100);
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+ tm->tm_year -= 1900;
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+
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+ tm->tm_mon--;
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+
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+ return 0;
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+}
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+
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+static int bq4802_set_time(struct device *dev, struct rtc_time *tm)
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+{
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+ struct platform_device *pdev = to_platform_device(dev);
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+ struct bq4802 *p = platform_get_drvdata(pdev);
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+ u8 sec, min, hrs, day, mon, yrs, century, val;
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+ unsigned long flags;
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+ unsigned int year;
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+
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+ year = tm->tm_year + 1900;
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+ century = year / 100;
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+ yrs = year % 100;
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+
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+ mon = tm->tm_mon + 1; /* tm_mon starts at zero */
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+ day = tm->tm_mday;
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+ hrs = tm->tm_hour;
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+ min = tm->tm_min;
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+ sec = tm->tm_sec;
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+
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+ BIN_TO_BCD(sec);
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+ BIN_TO_BCD(min);
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+ BIN_TO_BCD(hrs);
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+ BIN_TO_BCD(day);
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+ BIN_TO_BCD(mon);
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+ BIN_TO_BCD(yrs);
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+ BIN_TO_BCD(century);
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+
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+ spin_lock_irqsave(&p->lock, flags);
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+
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+ val = p->read(p, 0x0e);
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+ p->write(p, 0x0e, val | 0x08);
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+
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+ p->write(p, 0x00, sec);
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+ p->write(p, 0x02, min);
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+ p->write(p, 0x04, hrs);
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+ p->write(p, 0x06, day);
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+ p->write(p, 0x09, mon);
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+ p->write(p, 0x0a, yrs);
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+ p->write(p, 0x0f, century);
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+
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+ p->write(p, 0x0e, val);
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+
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+ spin_unlock_irqrestore(&p->lock, flags);
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+
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+ return 0;
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+}
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+
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+static const struct rtc_class_ops bq4802_ops = {
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+ .read_time = bq4802_read_time,
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+ .set_time = bq4802_set_time,
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+};
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+
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+static int __devinit bq4802_probe(struct platform_device *pdev)
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+{
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+ struct bq4802 *p = kzalloc(sizeof(*p), GFP_KERNEL);
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+ int err = -ENOMEM;
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+
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+ if (!p)
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+ goto out;
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+
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+ spin_lock_init(&p->lock);
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+
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+ p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!p->r) {
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+ p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
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+ err = -EINVAL;
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+ if (!p->r)
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+ goto out_free;
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+ }
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+ if (p->r->flags & IORESOURCE_IO) {
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+ p->regs = (void __iomem *) p->r->start;
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+ p->read = bq4802_read_io;
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+ p->write = bq4802_write_io;
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+ } else if (p->r->flags & IORESOURCE_MEM) {
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+ p->regs = ioremap(p->r->start, resource_size(p->r));
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+ p->read = bq4802_read_mem;
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+ p->write = bq4802_write_mem;
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+ } else {
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+ err = -EINVAL;
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+ goto out_free;
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+ }
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+
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+ p->rtc = rtc_device_register("bq4802", &pdev->dev,
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+ &bq4802_ops, THIS_MODULE);
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+ if (IS_ERR(p->rtc)) {
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+ err = PTR_ERR(p->rtc);
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+ goto out_iounmap;
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+ }
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+
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+ platform_set_drvdata(pdev, p);
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+ err = 0;
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+out:
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+ return err;
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+
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+out_iounmap:
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+ if (p->r->flags & IORESOURCE_MEM)
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+ iounmap(p->regs);
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+out_free:
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+ kfree(p);
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+ goto out;
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+}
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+
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+static int __devexit bq4802_remove(struct platform_device *pdev)
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+{
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+ struct bq4802 *p = platform_get_drvdata(pdev);
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+
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+ rtc_device_unregister(p->rtc);
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+ if (p->r->flags & IORESOURCE_MEM)
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+ iounmap(p->regs);
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+
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+ platform_set_drvdata(pdev, NULL);
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+
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+ kfree(p);
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+
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+ return 0;
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+}
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+
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+/* work with hotplug and coldplug */
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+MODULE_ALIAS("platform:rtc-bq4802");
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+
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+static struct platform_driver bq4802_driver = {
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+ .driver = {
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+ .name = "rtc-bq4802",
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+ .owner = THIS_MODULE,
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+ },
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+ .probe = bq4802_probe,
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+ .remove = __devexit_p(bq4802_remove),
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+};
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+
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+static int __init bq4802_init(void)
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+{
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+ return platform_driver_register(&bq4802_driver);
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+}
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+
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+static void __exit bq4802_exit(void)
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+{
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+ platform_driver_unregister(&bq4802_driver);
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+}
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+
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+module_init(bq4802_init);
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+module_exit(bq4802_exit);
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