rtc: Add TI BQ4802 RTC driver. (cca4c231) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/rtc/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -414,6 +414,15 @@ config RTC_DRV_M48T59
		This driver can also be built as a module, if so, the module
		will be called "rtc-m48t59".

		config RTC_DRV_BQ4802
		tristate "TI BQ4802"
		help
		If you say Y here you will get support for the TI
		BQ4802 RTC chip.

		This driver can also be built as a module. If so, the module
		will be called rtc-bq4802.

		config RTC_DRV_V3020
		tristate "EM Microelectronic V3020"
		help

drivers/rtc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -38,6 +38,7 @@ obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o
		obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o
		obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o
		obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
		obj-$(CONFIG_RTC_DRV_BQ4802) += rtc-bq4802.o
		obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
		obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
		obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o

drivers/rtc/rtc-bq4802.c

0 → 100644

+229 −0

Original line number	Diff line number	Diff line
		/* rtc-bq4802.c: TI BQ4802 RTC driver.
		*
		* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/io.h>
		#include <linux/platform_device.h>
		#include <linux/rtc.h>
		#include <linux/bcd.h>

		MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
		MODULE_DESCRIPTION("TI BQ4802 RTC driver");
		MODULE_LICENSE("GPL");

		struct bq4802 {
		void __iomem *regs;
		struct rtc_device *rtc;
		spinlock_t lock;
		struct resource *r;
		u8 (read)(struct bq4802 , int);
		void (write)(struct bq4802 , int, u8);
		};

		static u8 bq4802_read_io(struct bq4802 *p, int off)
		{
		return inb(p->regs + off);
		}

		static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
		{
		return outb(val, p->regs + off);
		}

		static u8 bq4802_read_mem(struct bq4802 *p, int off)
		{
		return readb(p->regs + off);
		}

		static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
		{
		return writeb(val, p->regs + off);
		}

		static int bq4802_read_time(struct device dev, struct rtc_time tm)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct bq4802 *p = platform_get_drvdata(pdev);
		unsigned long flags;
		unsigned int century;
		u8 val;

		spin_lock_irqsave(&p->lock, flags);

		val = p->read(p, 0x0e);
		p->write(p, 0xe, val \| 0x08);

		tm->tm_sec = p->read(p, 0x00);
		tm->tm_min = p->read(p, 0x02);
		tm->tm_hour = p->read(p, 0x04);
		tm->tm_mday = p->read(p, 0x06);
		tm->tm_mon = p->read(p, 0x09);
		tm->tm_year = p->read(p, 0x0a);
		tm->tm_wday = p->read(p, 0x08);
		century = p->read(p, 0x0f);

		p->write(p, 0x0e, val);

		spin_unlock_irqrestore(&p->lock, flags);

		BCD_TO_BIN(tm->tm_sec);
		BCD_TO_BIN(tm->tm_min);
		BCD_TO_BIN(tm->tm_hour);
		BCD_TO_BIN(tm->tm_mday);
		BCD_TO_BIN(tm->tm_mon);
		BCD_TO_BIN(tm->tm_year);
		BCD_TO_BIN(tm->tm_wday);
		BCD_TO_BIN(century);

		tm->tm_year += (century * 100);
		tm->tm_year -= 1900;

		tm->tm_mon--;

		return 0;
		}

		static int bq4802_set_time(struct device dev, struct rtc_time tm)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct bq4802 *p = platform_get_drvdata(pdev);
		u8 sec, min, hrs, day, mon, yrs, century, val;
		unsigned long flags;
		unsigned int year;

		year = tm->tm_year + 1900;
		century = year / 100;
		yrs = year % 100;

		mon = tm->tm_mon + 1; /* tm_mon starts at zero */
		day = tm->tm_mday;
		hrs = tm->tm_hour;
		min = tm->tm_min;
		sec = tm->tm_sec;

		BIN_TO_BCD(sec);
		BIN_TO_BCD(min);
		BIN_TO_BCD(hrs);
		BIN_TO_BCD(day);
		BIN_TO_BCD(mon);
		BIN_TO_BCD(yrs);
		BIN_TO_BCD(century);

		spin_lock_irqsave(&p->lock, flags);

		val = p->read(p, 0x0e);
		p->write(p, 0x0e, val \| 0x08);

		p->write(p, 0x00, sec);
		p->write(p, 0x02, min);
		p->write(p, 0x04, hrs);
		p->write(p, 0x06, day);
		p->write(p, 0x09, mon);
		p->write(p, 0x0a, yrs);
		p->write(p, 0x0f, century);

		p->write(p, 0x0e, val);

		spin_unlock_irqrestore(&p->lock, flags);

		return 0;
		}

		static const struct rtc_class_ops bq4802_ops = {
		.read_time = bq4802_read_time,
		.set_time = bq4802_set_time,
		};

		static int __devinit bq4802_probe(struct platform_device *pdev)
		{
		struct bq4802 p = kzalloc(sizeof(p), GFP_KERNEL);
		int err = -ENOMEM;

		if (!p)
		goto out;

		spin_lock_init(&p->lock);

		p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!p->r) {
		p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
		err = -EINVAL;
		if (!p->r)
		goto out_free;
		}
		if (p->r->flags & IORESOURCE_IO) {
		p->regs = (void __iomem *) p->r->start;
		p->read = bq4802_read_io;
		p->write = bq4802_write_io;
		} else if (p->r->flags & IORESOURCE_MEM) {
		p->regs = ioremap(p->r->start, resource_size(p->r));
		p->read = bq4802_read_mem;
		p->write = bq4802_write_mem;
		} else {
		err = -EINVAL;
		goto out_free;
		}

		p->rtc = rtc_device_register("bq4802", &pdev->dev,
		&bq4802_ops, THIS_MODULE);
		if (IS_ERR(p->rtc)) {
		err = PTR_ERR(p->rtc);
		goto out_iounmap;
		}

		platform_set_drvdata(pdev, p);
		err = 0;
		out:
		return err;

		out_iounmap:
		if (p->r->flags & IORESOURCE_MEM)
		iounmap(p->regs);
		out_free:
		kfree(p);
		goto out;
		}

		static int __devexit bq4802_remove(struct platform_device *pdev)
		{
		struct bq4802 *p = platform_get_drvdata(pdev);

		rtc_device_unregister(p->rtc);
		if (p->r->flags & IORESOURCE_MEM)
		iounmap(p->regs);

		platform_set_drvdata(pdev, NULL);

		kfree(p);

		return 0;
		}

		/* work with hotplug and coldplug */
		MODULE_ALIAS("platform:rtc-bq4802");

		static struct platform_driver bq4802_driver = {
		.driver = {
		.name = "rtc-bq4802",
		.owner = THIS_MODULE,
		},
		.probe = bq4802_probe,
		.remove = __devexit_p(bq4802_remove),
		};

		static int __init bq4802_init(void)
		{
		return platform_driver_register(&bq4802_driver);
		}

		static void __exit bq4802_exit(void)
		{
		platform_driver_unregister(&bq4802_driver);
		}

		module_init(bq4802_init);
		module_exit(bq4802_exit);