1 files changed, 725 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
new file mode 100644
index 0000000..85bf795
--- /dev/null
+++ b/drivers/rtc/rtc-cmos.c
@@ -0,0 +1,725 @@
+/*
+ * RTC class driver for "CMOS RTC":  PCs, ACPI, etc
+ *
+ * Copyright (C) 1996 Paul Gortmaker (drivers/char/rtc.c)
+ * Copyright (C) 2006 David Brownell (convert to new framework)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * The original "cmos clock" chip was an MC146818 chip, now obsolete.
+ * That defined the register interface now provided by all PCs, some
+ * non-PC systems, and incorporated into ACPI.  Modern PC chipsets
+ * integrate an MC146818 clone in their southbridge, and boards use
+ * that instead of discrete clones like the DS12887 or M48T86.  There
+ * are also clones that connect using the LPC bus.
+ *
+ * That register API is also used directly by various other drivers
+ * (notably for integrated NVRAM), infrastructure (x86 has code to
+ * bypass the RTC framework, directly reading the RTC during boot
+ * and updating minutes/seconds for systems using NTP synch) and
+ * utilities (like userspace 'hwclock', if no /dev node exists).
+ *
+ * So **ALL** calls to CMOS_READ and CMOS_WRITE must be done with
+ * interrupts disabled, holding the global rtc_lock, to exclude those
+ * other drivers and utilities on correctly configured systems.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/mod_devicetable.h>
+
+/* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */
+#include <asm-generic/rtc.h>
+
+
+struct cmos_rtc {
+	struct rtc_device	*rtc;
+	struct device		*dev;
+	int			irq;
+	struct resource		*iomem;
+
+	u8			suspend_ctrl;
+
+	/* newer hardware extends the original register set */
+	u8			day_alrm;
+	u8			mon_alrm;
+	u8			century;
+};
+
+/* both platform and pnp busses use negative numbers for invalid irqs */
+#define is_valid_irq(n)		((n) >= 0)
+
+static const char driver_name[] = "rtc_cmos";
+
+/*----------------------------------------------------------------*/
+
+static int cmos_read_time(struct device *dev, struct rtc_time *t)
+{
+	/* REVISIT:  if the clock has a "century" register, use
+	 * that instead of the heuristic in get_rtc_time().
+	 * That'll make Y3K compatility (year > 2070) easy!
+	 */
+	get_rtc_time(t);
+	return 0;
+}
+
+static int cmos_set_time(struct device *dev, struct rtc_time *t)
+{
+	/* REVISIT:  set the "century" register if available
+	 *
+	 * NOTE: this ignores the issue whereby updating the seconds
+	 * takes effect exactly 500ms after we write the register.
+	 * (Also queueing and other delays before we get this far.)
+	 */
+	return set_rtc_time(t);
+}
+
+static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+	unsigned char	rtc_control;
+
+	if (!is_valid_irq(cmos->irq))
+		return -EIO;
+
+	/* Basic alarms only support hour, minute, and seconds fields.
+	 * Some also support day and month, for alarms up to a year in
+	 * the future.
+	 */
+	t->time.tm_mday = -1;
+	t->time.tm_mon = -1;
+
+	spin_lock_irq(&rtc_lock);
+	t->time.tm_sec = CMOS_READ(RTC_SECONDS_ALARM);
+	t->time.tm_min = CMOS_READ(RTC_MINUTES_ALARM);
+	t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM);
+
+	if (cmos->day_alrm) {
+		t->time.tm_mday = CMOS_READ(cmos->day_alrm);
+		if (!t->time.tm_mday)
+			t->time.tm_mday = -1;
+
+		if (cmos->mon_alrm) {
+			t->time.tm_mon = CMOS_READ(cmos->mon_alrm);
+			if (!t->time.tm_mon)
+				t->time.tm_mon = -1;
+		}
+	}
+
+	rtc_control = CMOS_READ(RTC_CONTROL);
+	spin_unlock_irq(&rtc_lock);
+
+	/* REVISIT this assumes PC style usage:  always BCD */
+
+	if (((unsigned)t->time.tm_sec) < 0x60)
+		t->time.tm_sec = BCD2BIN(t->time.tm_sec);
+	else
+		t->time.tm_sec = -1;
+	if (((unsigned)t->time.tm_min) < 0x60)
+		t->time.tm_min = BCD2BIN(t->time.tm_min);
+	else
+		t->time.tm_min = -1;
+	if (((unsigned)t->time.tm_hour) < 0x24)
+		t->time.tm_hour = BCD2BIN(t->time.tm_hour);
+	else
+		t->time.tm_hour = -1;
+
+	if (cmos->day_alrm) {
+		if (((unsigned)t->time.tm_mday) <= 0x31)
+			t->time.tm_mday = BCD2BIN(t->time.tm_mday);
+		else
+			t->time.tm_mday = -1;
+		if (cmos->mon_alrm) {
+			if (((unsigned)t->time.tm_mon) <= 0x12)
+				t->time.tm_mon = BCD2BIN(t->time.tm_mon) - 1;
+			else
+				t->time.tm_mon = -1;
+		}
+	}
+	t->time.tm_year = -1;
+
+	t->enabled = !!(rtc_control & RTC_AIE);
+	t->pending = 0;
+
+	return 0;
+}
+
+static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+	unsigned char	mon, mday, hrs, min, sec;
+	unsigned char	rtc_control, rtc_intr;
+
+	if (!is_valid_irq(cmos->irq))
+		return -EIO;
+
+	/* REVISIT this assumes PC style usage:  always BCD */
+
+	/* Writing 0xff means "don't care" or "match all".  */
+
+	mon = t->time.tm_mon;
+	mon = (mon < 12) ? BIN2BCD(mon) : 0xff;
+	mon++;
+
+	mday = t->time.tm_mday;
+	mday = (mday >= 1 && mday <= 31) ? BIN2BCD(mday) : 0xff;
+
+	hrs = t->time.tm_hour;
+	hrs = (hrs < 24) ? BIN2BCD(hrs) : 0xff;
+
+	min = t->time.tm_min;
+	min = (min < 60) ? BIN2BCD(min) : 0xff;
+
+	sec = t->time.tm_sec;
+	sec = (sec < 60) ? BIN2BCD(sec) : 0xff;
+
+	spin_lock_irq(&rtc_lock);
+
+	/* next rtc irq must not be from previous alarm setting */
+	rtc_control = CMOS_READ(RTC_CONTROL);
+	rtc_control &= ~RTC_AIE;
+	CMOS_WRITE(rtc_control, RTC_CONTROL);
+	rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
+	if (rtc_intr)
+		rtc_update_irq(&cmos->rtc->class_dev, 1, rtc_intr);
+
+	/* update alarm */
+	CMOS_WRITE(hrs, RTC_HOURS_ALARM);
+	CMOS_WRITE(min, RTC_MINUTES_ALARM);
+	CMOS_WRITE(sec, RTC_SECONDS_ALARM);
+
+	/* the system may support an "enhanced" alarm */
+	if (cmos->day_alrm) {
+		CMOS_WRITE(mday, cmos->day_alrm);
+		if (cmos->mon_alrm)
+			CMOS_WRITE(mon, cmos->mon_alrm);
+	}
+
+	if (t->enabled) {
+		rtc_control |= RTC_AIE;
+		CMOS_WRITE(rtc_control, RTC_CONTROL);
+		rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
+		if (rtc_intr)
+			rtc_update_irq(&cmos->rtc->class_dev, 1, rtc_intr);
+	}
+
+	spin_unlock_irq(&rtc_lock);
+
+	return 0;
+}
+
+static int cmos_set_freq(struct device *dev, int freq)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+	int		f;
+	unsigned long	flags;
+
+	if (!is_valid_irq(cmos->irq))
+		return -ENXIO;
+
+	/* 0 = no irqs; 1 = 2^15 Hz ... 15 = 2^0 Hz */
+	f = ffs(freq);
+	if (f != 0) {
+		if (f-- > 16 || freq != (1 << f))
+			return -EINVAL;
+		f = 16 - f;
+	}
+
+	spin_lock_irqsave(&rtc_lock, flags);
+	CMOS_WRITE(RTC_REF_CLCK_32KHZ | f, RTC_FREQ_SELECT);
+	spin_unlock_irqrestore(&rtc_lock, flags);
+
+	return 0;
+}
+
+#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
+
+static int
+cmos_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+	unsigned char	rtc_control, rtc_intr;
+	unsigned long	flags;
+
+	switch (cmd) {
+	case RTC_AIE_OFF:
+	case RTC_AIE_ON:
+	case RTC_UIE_OFF:
+	case RTC_UIE_ON:
+	case RTC_PIE_OFF:
+	case RTC_PIE_ON:
+		if (!is_valid_irq(cmos->irq))
+			return -EINVAL;
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	spin_lock_irqsave(&rtc_lock, flags);
+	rtc_control = CMOS_READ(RTC_CONTROL);
+	switch (cmd) {
+	case RTC_AIE_OFF:	/* alarm off */
+		rtc_control &= ~RTC_AIE;
+		break;
+	case RTC_AIE_ON:	/* alarm on */
+		rtc_control |= RTC_AIE;
+		break;
+	case RTC_UIE_OFF:	/* update off */
+		rtc_control &= ~RTC_UIE;
+		break;
+	case RTC_UIE_ON:	/* update on */
+		rtc_control |= RTC_UIE;
+		break;
+	case RTC_PIE_OFF:	/* periodic off */
+		rtc_control &= ~RTC_PIE;
+		break;
+	case RTC_PIE_ON:	/* periodic on */
+		rtc_control |= RTC_PIE;
+		break;
+	}
+	CMOS_WRITE(rtc_control, RTC_CONTROL);
+	rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
+	if (rtc_intr)
+		rtc_update_irq(&cmos->rtc->class_dev, 1, rtc_intr);
+	spin_unlock_irqrestore(&rtc_lock, flags);
+	return 0;
+}
+
+#else
+#define	cmos_rtc_ioctl	NULL
+#endif
+
+#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
+
+static int cmos_procfs(struct device *dev, struct seq_file *seq)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+	unsigned char	rtc_control, valid;
+
+	spin_lock_irq(&rtc_lock);
+	rtc_control = CMOS_READ(RTC_CONTROL);
+	valid = CMOS_READ(RTC_VALID);
+	spin_unlock_irq(&rtc_lock);
+
+	/* NOTE:  at least ICH6 reports battery status using a different
+	 * (non-RTC) bit; and SQWE is ignored on many current systems.
+	 */
+	return seq_printf(seq,
+			"periodic_IRQ\t: %s\n"
+			"update_IRQ\t: %s\n"
+			// "square_wave\t: %s\n"
+			// "BCD\t\t: %s\n"
+			"DST_enable\t: %s\n"
+			"periodic_freq\t: %d\n"
+			"batt_status\t: %s\n",
+			(rtc_control & RTC_PIE) ? "yes" : "no",
+			(rtc_control & RTC_UIE) ? "yes" : "no",
+			// (rtc_control & RTC_SQWE) ? "yes" : "no",
+			// (rtc_control & RTC_DM_BINARY) ? "no" : "yes",
+			(rtc_control & RTC_DST_EN) ? "yes" : "no",
+			cmos->rtc->irq_freq,
+			(valid & RTC_VRT) ? "okay" : "dead");
+}
+
+#else
+#define	cmos_procfs	NULL
+#endif
+
+static const struct rtc_class_ops cmos_rtc_ops = {
+	.ioctl		= cmos_rtc_ioctl,
+	.read_time	= cmos_read_time,
+	.set_time	= cmos_set_time,
+	.read_alarm	= cmos_read_alarm,
+	.set_alarm	= cmos_set_alarm,
+	.proc		= cmos_procfs,
+	.irq_set_freq	= cmos_set_freq,
+};
+
+/*----------------------------------------------------------------*/
+
+static struct cmos_rtc	cmos_rtc;
+
+static irqreturn_t cmos_interrupt(int irq, void *p)
+{
+	u8		irqstat;
+
+	spin_lock(&rtc_lock);
+	irqstat = CMOS_READ(RTC_INTR_FLAGS);
+	spin_unlock(&rtc_lock);
+
+	if (irqstat) {
+		/* NOTE: irqstat may have e.g. RTC_PF set
+		 * even when RTC_PIE is clear...
+		 */
+		rtc_update_irq(p, 1, irqstat);
+		return IRQ_HANDLED;
+	} else
+		return IRQ_NONE;
+}
+
+#ifdef	CONFIG_PNPACPI
+#define	is_pnpacpi()	1
+#define	INITSECTION
+
+#else
+#define	is_pnpacpi()	0
+#define	INITSECTION	__init
+#endif
+
+static int INITSECTION
+cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
+{
+	struct cmos_rtc_board_info	*info = dev->platform_data;
+	int				retval = 0;
+	unsigned char			rtc_control;
+
+	/* there can be only one ... */
+	if (cmos_rtc.dev)
+		return -EBUSY;
+
+	if (!ports)
+		return -ENODEV;
+
+	cmos_rtc.irq = rtc_irq;
+	cmos_rtc.iomem = ports;
+
+	/* For ACPI systems the info comes from the FADT.  On others,
+	 * board specific setup provides it as appropriate.
+	 */
+	if (info) {
+		cmos_rtc.day_alrm = info->rtc_day_alarm;
+		cmos_rtc.mon_alrm = info->rtc_mon_alarm;
+		cmos_rtc.century = info->rtc_century;
+	}
+
+	cmos_rtc.rtc = rtc_device_register(driver_name, dev,
+				&cmos_rtc_ops, THIS_MODULE);
+	if (IS_ERR(cmos_rtc.rtc))
+		return PTR_ERR(cmos_rtc.rtc);
+
+	cmos_rtc.dev = dev;
+	dev_set_drvdata(dev, &cmos_rtc);
+
+	/* platform and pnp busses handle resources incompatibly.
+	 *
+	 * REVISIT for non-x86 systems we may need to handle io memory
+	 * resources: ioremap them, and request_mem_region().
+	 */
+	if (is_pnpacpi()) {
+		retval = request_resource(&ioport_resource, ports);
+		if (retval < 0) {
+			dev_dbg(dev, "i/o registers already in use\n");
+			goto cleanup0;
+		}
+	}
+	rename_region(ports, cmos_rtc.rtc->class_dev.class_id);
+
+	spin_lock_irq(&rtc_lock);
+
+	/* force periodic irq to CMOS reset default of 1024Hz;
+	 *
+	 * REVISIT it's been reported that at least one x86_64 ALI mobo
+	 * doesn't use 32KHz here ... for portability we might need to
+	 * do something about other clock frequencies.
+	 */
+	CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
+	cmos_rtc.rtc->irq_freq = 1024;
+
+	/* disable irqs.
+	 *
+	 * NOTE after changing RTC_xIE bits we always read INTR_FLAGS;
+	 * allegedly some older rtcs need that to handle irqs properly
+	 */
+	rtc_control = CMOS_READ(RTC_CONTROL);
+	rtc_control &= ~(RTC_PIE | RTC_AIE | RTC_UIE);
+	CMOS_WRITE(rtc_control, RTC_CONTROL);
+	CMOS_READ(RTC_INTR_FLAGS);
+
+	spin_unlock_irq(&rtc_lock);
+
+	/* FIXME teach the alarm code how to handle binary mode;
+	 * <asm-generic/rtc.h> doesn't know 12-hour mode either.
+	 */
+	if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) {
+		dev_dbg(dev, "only 24-hr BCD mode supported\n");
+		retval = -ENXIO;
+		goto cleanup1;
+	}
+
+	if (is_valid_irq(rtc_irq))
+		retval = request_irq(rtc_irq, cmos_interrupt, IRQF_DISABLED,
+				cmos_rtc.rtc->class_dev.class_id,
+				&cmos_rtc.rtc->class_dev);
+	if (retval < 0) {
+		dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
+		goto cleanup1;
+	}
+
+	/* REVISIT optionally make 50 or 114 bytes NVRAM available,
+	 * like rtc-ds1553, rtc-ds1742 ... this will often include
+	 * registers for century, and day/month alarm.
+	 */
+
+	pr_info("%s: alarms up to one %s%s\n",
+			cmos_rtc.rtc->class_dev.class_id,
+			is_valid_irq(rtc_irq)
+				?  (cmos_rtc.mon_alrm
+					? "year"
+					: (cmos_rtc.day_alrm
+						? "month" : "day"))
+				: "no",
+			cmos_rtc.century ? ", y3k" : ""
+			);
+
+	return 0;
+
+cleanup1:
+	rename_region(ports, NULL);
+cleanup0:
+	rtc_device_unregister(cmos_rtc.rtc);
+	return retval;
+}
+
+static void cmos_do_shutdown(void)
+{
+	unsigned char	rtc_control;
+
+	spin_lock_irq(&rtc_lock);
+	rtc_control = CMOS_READ(RTC_CONTROL);
+	rtc_control &= ~(RTC_PIE|RTC_AIE|RTC_UIE);
+	CMOS_WRITE(rtc_control, RTC_CONTROL);
+	CMOS_READ(RTC_INTR_FLAGS);
+	spin_unlock_irq(&rtc_lock);
+}
+
+static void __exit cmos_do_remove(struct device *dev)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+
+	cmos_do_shutdown();
+
+	if (is_pnpacpi())
+		release_resource(cmos->iomem);
+	rename_region(cmos->iomem, NULL);
+
+	if (is_valid_irq(cmos->irq))
+		free_irq(cmos->irq, &cmos_rtc.rtc->class_dev);
+
+	rtc_device_unregister(cmos_rtc.rtc);
+
+	cmos_rtc.dev = NULL;
+	dev_set_drvdata(dev, NULL);
+}
+
+#ifdef	CONFIG_PM
+
+static int cmos_suspend(struct device *dev, pm_message_t mesg)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+	int		do_wake = device_may_wakeup(dev);
+	unsigned char	tmp, irqstat;
+
+	/* only the alarm might be a wakeup event source */
+	spin_lock_irq(&rtc_lock);
+	cmos->suspend_ctrl = tmp = CMOS_READ(RTC_CONTROL);
+	if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) {
+		if (do_wake)
+			tmp &= ~(RTC_PIE|RTC_UIE);
+		else
+			tmp &= ~(RTC_PIE|RTC_AIE|RTC_UIE);
+		CMOS_WRITE(tmp, RTC_CONTROL);
+		irqstat = CMOS_READ(RTC_INTR_FLAGS);
+	} else
+		irqstat = 0;
+	spin_unlock_irq(&rtc_lock);
+
+	if (irqstat)
+		rtc_update_irq(&cmos->rtc->class_dev, 1, irqstat);
+
+	/* ACPI HOOK:  enable ACPI_EVENT_RTC when (tmp & RTC_AIE)
+	 * ... it'd be best if we could do that under rtc_lock.
+	 */
+
+	pr_debug("%s: suspend%s, ctrl %02x\n",
+			cmos_rtc.rtc->class_dev.class_id,
+			(tmp & RTC_AIE) ? ", alarm may wake" : "",
+			tmp);
+
+	return 0;
+}
+
+static int cmos_resume(struct device *dev)
+{
+	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
+	unsigned char	tmp = cmos->suspend_ctrl;
+
+	/* REVISIT:  a mechanism to resync the system clock (jiffies)
+	 * on resume should be portable between platforms ...
+	 */
+
+	/* re-enable any irqs previously active */
+	if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) {
+
+		/* ACPI HOOK:  disable ACPI_EVENT_RTC when (tmp & RTC_AIE) */
+
+		spin_lock_irq(&rtc_lock);
+		CMOS_WRITE(tmp, RTC_CONTROL);
+		tmp = CMOS_READ(RTC_INTR_FLAGS);
+		spin_unlock_irq(&rtc_lock);
+		if (tmp)
+			rtc_update_irq(&cmos->rtc->class_dev, 1, tmp);
+	}
+
+	pr_debug("%s: resume, ctrl %02x\n",
+			cmos_rtc.rtc->class_dev.class_id,
+			cmos->suspend_ctrl);
+
+
+	return 0;
+}
+
+#else
+#define	cmos_suspend	NULL
+#define	cmos_resume	NULL
+#endif
+
+/*----------------------------------------------------------------*/
+
+/* The "CMOS" RTC normally lives on the platform_bus.  On ACPI systems,
+ * the device node may alternatively be created as a PNP device.
+ */
+
+#ifdef	CONFIG_PNPACPI
+
+#include <linux/pnp.h>
+
+static int __devinit
+cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
+{
+	/* REVISIT paranoia argues for a shutdown notifier, since PNP
+	 * drivers can't provide shutdown() methods to disable IRQs.
+	 * Or better yet, fix PNP to allow those methods...
+	 */
+	return cmos_do_probe(&pnp->dev,
+			&pnp->res.port_resource[0],
+			pnp->res.irq_resource[0].start);
+}
+
+static void __exit cmos_pnp_remove(struct pnp_dev *pnp)
+{
+	cmos_do_remove(&pnp->dev);
+}
+
+#ifdef	CONFIG_PM
+
+static int cmos_pnp_suspend(struct pnp_dev *pnp, pm_message_t mesg)
+{
+	return cmos_suspend(&pnp->dev, mesg);
+}
+
+static int cmos_pnp_resume(struct pnp_dev *pnp)
+{
+	return cmos_resume(&pnp->dev);
+}
+
+#else
+#define	cmos_pnp_suspend	NULL
+#define	cmos_pnp_resume		NULL
+#endif
+
+
+static const struct pnp_device_id rtc_ids[] = {
+	{ .id = "PNP0b00", },
+	{ .id = "PNP0b01", },
+	{ .id = "PNP0b02", },
+	{ },
+};
+MODULE_DEVICE_TABLE(pnp, rtc_ids);
+
+static struct pnp_driver cmos_pnp_driver = {
+	.name		= (char *) driver_name,
+	.id_table	= rtc_ids,
+	.probe		= cmos_pnp_probe,
+	.remove		= __exit_p(cmos_pnp_remove),
+
+	/* flag ensures resume() gets called, and stops syslog spam */
+	.flags		= PNP_DRIVER_RES_DO_NOT_CHANGE,
+	.suspend	= cmos_pnp_suspend,
+	.resume		= cmos_pnp_resume,
+};
+
+static int __init cmos_init(void)
+{
+	return pnp_register_driver(&cmos_pnp_driver);
+}
+module_init(cmos_init);
+
+static void __exit cmos_exit(void)
+{
+	pnp_unregister_driver(&cmos_pnp_driver);
+}
+module_exit(cmos_exit);
+
+#else	/* no PNPACPI */
+
+/*----------------------------------------------------------------*/
+
+/* Platform setup should have set up an RTC device, when PNPACPI is
+ * unavailable ... this is the normal case, common even on PCs.
+ */
+
+static int __init cmos_platform_probe(struct platform_device *pdev)
+{
+	return cmos_do_probe(&pdev->dev,
+			platform_get_resource(pdev, IORESOURCE_IO, 0),
+			platform_get_irq(pdev, 0));
+}
+
+static int __exit cmos_platform_remove(struct platform_device *pdev)
+{
+	cmos_do_remove(&pdev->dev);
+	return 0;
+}
+
+static void cmos_platform_shutdown(struct platform_device *pdev)
+{
+	cmos_do_shutdown();
+}
+
+static struct platform_driver cmos_platform_driver = {
+	.remove		= __exit_p(cmos_platform_remove),
+	.shutdown	= cmos_platform_shutdown,
+	.driver = {
+		.name		= (char *) driver_name,
+		.suspend	= cmos_suspend,
+		.resume		= cmos_resume,
+	}
+};
+
+static int __init cmos_init(void)
+{
+	return platform_driver_probe(&cmos_platform_driver,
+			cmos_platform_probe);
+}
+module_init(cmos_init);
+
+static void __exit cmos_exit(void)
+{
+	platform_driver_unregister(&cmos_platform_driver);
+}
+module_exit(cmos_exit);
+
+
+#endif	/* !PNPACPI */
+
+MODULE_AUTHOR("David Brownell");
+MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs");
+MODULE_LICENSE("GPL");