[PATCH] RTC: class driver for Samsung S3C series SoC
Ben Dooks [Sat, 1 Jul 2006 11:36:26 +0000 (04:36 -0700)]
This is a renamed and tested version of the previous S3C24XX RTC class
driver.

The driver has been renamed from the original s3c2410-rtc, which is now too
narrow for the range of devices supported.

The rtc-s3c has been chosen as there is the distinct possibility of this
driver being carried forward into newer Samsung SoC silicon.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/rtc/Kconfig
drivers/rtc/Makefile
drivers/rtc/rtc-s3c.c [new file with mode: 0644]

index d51afbe..f5b9f18 100644 (file)
@@ -182,6 +182,22 @@ config RTC_DRV_RS5C372
          This driver can also be built as a module. If so, the module
          will be called rtc-rs5c372.
 
+config RTC_DRV_S3C
+       tristate "Samsung S3C series SoC RTC"
+       depends on RTC_CLASS && ARCH_S3C2410
+       help
+         RTC (Realtime Clock) driver for the clock inbuilt into the
+         Samsung S3C24XX series of SoCs. This can provide periodic
+         interrupt rates from 1Hz to 64Hz for user programs, and
+         wakeup from Alarm.
+
+         The driver currently supports the common features on all the
+         S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
+         and S3C2442.
+
+         This driver can also be build as a module. If so, the module
+         will be called rtc-s3c.
+
 config RTC_DRV_M48T86
        tristate "ST M48T86/Dallas DS12887"
        depends on RTC_CLASS
index da5e387..5422071 100644 (file)
@@ -19,6 +19,7 @@ obj-$(CONFIG_RTC_DRV_DS1742)  += rtc-ds1742.o
 obj-$(CONFIG_RTC_DRV_PCF8563)  += rtc-pcf8563.o
 obj-$(CONFIG_RTC_DRV_PCF8583)  += rtc-pcf8583.o
 obj-$(CONFIG_RTC_DRV_RS5C372)  += rtc-rs5c372.o
+obj-$(CONFIG_RTC_DRV_S3C)      += rtc-s3c.o
 obj-$(CONFIG_RTC_DRV_RS5C348)  += rtc-rs5c348.o
 obj-$(CONFIG_RTC_DRV_M48T86)   += rtc-m48t86.o
 obj-$(CONFIG_RTC_DRV_DS1553)   += rtc-ds1553.o
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
new file mode 100644 (file)
index 0000000..d6d1bff
--- /dev/null
@@ -0,0 +1,607 @@
+/* drivers/rtc/rtc-s3c.c
+ *
+ * Copyright (c) 2004,2006 Simtec Electronics
+ *     Ben Dooks, <ben@simtec.co.uk>
+ *     http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * S3C2410/S3C2440/S3C24XX Internal RTC Driver
+*/
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/clk.h>
+
+#include <asm/hardware.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/rtc.h>
+
+#include <asm/mach/time.h>
+
+#include <asm/arch/regs-rtc.h>
+
+/* I have yet to find an S3C implementation with more than one
+ * of these rtc blocks in */
+
+static struct resource *s3c_rtc_mem;
+
+static void __iomem *s3c_rtc_base;
+static int s3c_rtc_alarmno = NO_IRQ;
+static int s3c_rtc_tickno  = NO_IRQ;
+static int s3c_rtc_freq    = 1;
+
+static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
+static unsigned int tick_count;
+
+/* IRQ Handlers */
+
+static irqreturn_t s3c_rtc_alarmirq(int irq, void *id, struct pt_regs *r)
+{
+       struct rtc_device *rdev = id;
+
+       rtc_update_irq(&rdev->class_dev, 1, RTC_AF | RTC_IRQF);
+       return IRQ_HANDLED;
+}
+
+static irqreturn_t s3c_rtc_tickirq(int irq, void *id, struct pt_regs *r)
+{
+       struct rtc_device *rdev = id;
+
+       rtc_update_irq(&rdev->class_dev, tick_count++, RTC_PF | RTC_IRQF);
+       return IRQ_HANDLED;
+}
+
+/* Update control registers */
+static void s3c_rtc_setaie(int to)
+{
+       unsigned int tmp;
+
+       pr_debug("%s: aie=%d\n", __FUNCTION__, to);
+
+       tmp = readb(S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
+
+       if (to)
+               tmp |= S3C2410_RTCALM_ALMEN;
+
+       writeb(tmp, S3C2410_RTCALM);
+}
+
+static void s3c_rtc_setpie(int to)
+{
+       unsigned int tmp;
+
+       pr_debug("%s: pie=%d\n", __FUNCTION__, to);
+
+       spin_lock_irq(&s3c_rtc_pie_lock);
+       tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
+
+       if (to)
+               tmp |= S3C2410_TICNT_ENABLE;
+
+       writeb(tmp, S3C2410_TICNT);
+       spin_unlock_irq(&s3c_rtc_pie_lock);
+}
+
+static void s3c_rtc_setfreq(int freq)
+{
+       unsigned int tmp;
+
+       spin_lock_irq(&s3c_rtc_pie_lock);
+       tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
+
+       s3c_rtc_freq = freq;
+
+       tmp |= (128 / freq)-1;
+
+       writeb(tmp, S3C2410_TICNT);
+       spin_unlock_irq(&s3c_rtc_pie_lock);
+}
+
+/* Time read/write */
+
+static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
+{
+       unsigned int have_retried = 0;
+
+ retry_get_time:
+       rtc_tm->tm_min  = readb(S3C2410_RTCMIN);
+       rtc_tm->tm_hour = readb(S3C2410_RTCHOUR);
+       rtc_tm->tm_mday = readb(S3C2410_RTCDATE);
+       rtc_tm->tm_mon  = readb(S3C2410_RTCMON);
+       rtc_tm->tm_year = readb(S3C2410_RTCYEAR);
+       rtc_tm->tm_sec  = readb(S3C2410_RTCSEC);
+
+       /* the only way to work out wether the system was mid-update
+        * when we read it is to check the second counter, and if it
+        * is zero, then we re-try the entire read
+        */
+
+       if (rtc_tm->tm_sec == 0 && !have_retried) {
+               have_retried = 1;
+               goto retry_get_time;
+       }
+
+       pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
+                rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
+                rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
+
+       BCD_TO_BIN(rtc_tm->tm_sec);
+       BCD_TO_BIN(rtc_tm->tm_min);
+       BCD_TO_BIN(rtc_tm->tm_hour);
+       BCD_TO_BIN(rtc_tm->tm_mday);
+       BCD_TO_BIN(rtc_tm->tm_mon);
+       BCD_TO_BIN(rtc_tm->tm_year);
+
+       rtc_tm->tm_year += 100;
+       rtc_tm->tm_mon -= 1;
+
+       return 0;
+}
+
+static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+       /* the rtc gets round the y2k problem by just not supporting it */
+
+       if (tm->tm_year < 100)
+               return -EINVAL;
+
+       writeb(BIN2BCD(tm->tm_sec),  S3C2410_RTCSEC);
+       writeb(BIN2BCD(tm->tm_min),  S3C2410_RTCMIN);
+       writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR);
+       writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE);
+       writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON);
+       writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR);
+
+       return 0;
+}
+
+static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       struct rtc_time *alm_tm = &alrm->time;
+       unsigned int alm_en;
+
+       alm_tm->tm_sec  = readb(S3C2410_ALMSEC);
+       alm_tm->tm_min  = readb(S3C2410_ALMMIN);
+       alm_tm->tm_hour = readb(S3C2410_ALMHOUR);
+       alm_tm->tm_mon  = readb(S3C2410_ALMMON);
+       alm_tm->tm_mday = readb(S3C2410_ALMDATE);
+       alm_tm->tm_year = readb(S3C2410_ALMYEAR);
+
+       alm_en = readb(S3C2410_RTCALM);
+
+       pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
+                alm_en,
+                alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
+                alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
+
+
+       /* decode the alarm enable field */
+
+       if (alm_en & S3C2410_RTCALM_SECEN)
+               BCD_TO_BIN(alm_tm->tm_sec);
+       else
+               alm_tm->tm_sec = 0xff;
+
+       if (alm_en & S3C2410_RTCALM_MINEN)
+               BCD_TO_BIN(alm_tm->tm_min);
+       else
+               alm_tm->tm_min = 0xff;
+
+       if (alm_en & S3C2410_RTCALM_HOUREN)
+               BCD_TO_BIN(alm_tm->tm_hour);
+       else
+               alm_tm->tm_hour = 0xff;
+
+       if (alm_en & S3C2410_RTCALM_DAYEN)
+               BCD_TO_BIN(alm_tm->tm_mday);
+       else
+               alm_tm->tm_mday = 0xff;
+
+       if (alm_en & S3C2410_RTCALM_MONEN) {
+               BCD_TO_BIN(alm_tm->tm_mon);
+               alm_tm->tm_mon -= 1;
+       } else {
+               alm_tm->tm_mon = 0xff;
+       }
+
+       if (alm_en & S3C2410_RTCALM_YEAREN)
+               BCD_TO_BIN(alm_tm->tm_year);
+       else
+               alm_tm->tm_year = 0xffff;
+
+       return 0;
+}
+
+static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       struct rtc_time *tm = &alrm->time;
+       unsigned int alrm_en;
+
+       pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
+                alrm->enabled,
+                tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
+                tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
+
+
+       alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
+       writeb(0x00, S3C2410_RTCALM);
+
+       if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
+               alrm_en |= S3C2410_RTCALM_SECEN;
+               writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC);
+       }
+
+       if (tm->tm_min < 60 && tm->tm_min >= 0) {
+               alrm_en |= S3C2410_RTCALM_MINEN;
+               writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN);
+       }
+
+       if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
+               alrm_en |= S3C2410_RTCALM_HOUREN;
+               writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR);
+       }
+
+       pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
+
+       writeb(alrm_en, S3C2410_RTCALM);
+
+       if (0) {
+               alrm_en = readb(S3C2410_RTCALM);
+               alrm_en &= ~S3C2410_RTCALM_ALMEN;
+               writeb(alrm_en, S3C2410_RTCALM);
+               disable_irq_wake(s3c_rtc_alarmno);
+       }
+
+       if (alrm->enabled)
+               enable_irq_wake(s3c_rtc_alarmno);
+       else
+               disable_irq_wake(s3c_rtc_alarmno);
+
+       return 0;
+}
+
+static int s3c_rtc_ioctl(struct device *dev,
+                        unsigned int cmd, unsigned long arg)
+{
+       unsigned int ret = -ENOIOCTLCMD;
+
+       switch (cmd) {
+       case RTC_AIE_OFF:
+       case RTC_AIE_ON:
+               s3c_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
+               ret = 0;
+               break;
+
+       case RTC_PIE_OFF:
+       case RTC_PIE_ON:
+               tick_count = 0;
+               s3c_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
+               ret = 0;
+               break;
+
+       case RTC_IRQP_READ:
+               ret = put_user(s3c_rtc_freq, (unsigned long __user *)arg);
+               break;
+
+       case RTC_IRQP_SET:
+               /* check for power of 2 */
+
+               if ((arg & (arg-1)) != 0 || arg < 1) {
+                       ret = -EINVAL;
+                       goto exit;
+               }
+
+               pr_debug("s3c2410_rtc: setting frequency %ld\n", arg);
+
+               s3c_rtc_setfreq(arg);
+               ret = 0;
+               break;
+
+       case RTC_UIE_ON:
+       case RTC_UIE_OFF:
+               ret = -EINVAL;
+       }
+
+ exit:
+       return ret;
+}
+
+static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+       unsigned int rtcalm = readb(S3C2410_RTCALM);
+       unsigned int ticnt = readb (S3C2410_TICNT);
+
+       seq_printf(seq, "alarm_IRQ\t: %s\n",
+                  (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" );
+
+       seq_printf(seq, "periodic_IRQ\t: %s\n",
+                    (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
+
+       seq_printf(seq, "periodic_freq\t: %d\n", s3c_rtc_freq);
+
+       return 0;
+}
+
+static int s3c_rtc_open(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
+       int ret;
+
+       ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
+                         SA_INTERRUPT,  "s3c2410-rtc alarm", rtc_dev);
+
+       if (ret) {
+               dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
+               return ret;
+       }
+
+       ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
+                         SA_INTERRUPT,  "s3c2410-rtc tick", rtc_dev);
+
+       if (ret) {
+               dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
+               goto tick_err;
+       }
+
+       return ret;
+
+ tick_err:
+       free_irq(s3c_rtc_alarmno, rtc_dev);
+       return ret;
+}
+
+static void s3c_rtc_release(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
+
+       /* do not clear AIE here, it may be needed for wake */
+
+       s3c_rtc_setpie(0);
+       free_irq(s3c_rtc_alarmno, rtc_dev);
+       free_irq(s3c_rtc_tickno, rtc_dev);
+}
+
+static struct rtc_class_ops s3c_rtcops = {
+       .open           = s3c_rtc_open,
+       .release        = s3c_rtc_release,
+       .ioctl          = s3c_rtc_ioctl,
+       .read_time      = s3c_rtc_gettime,
+       .set_time       = s3c_rtc_settime,
+       .read_alarm     = s3c_rtc_getalarm,
+       .set_alarm      = s3c_rtc_setalarm,
+       .proc           = s3c_rtc_proc,
+};
+
+static void s3c_rtc_enable(struct platform_device *pdev, int en)
+{
+       unsigned int tmp;
+
+       if (s3c_rtc_base == NULL)
+               return;
+
+       if (!en) {
+               tmp = readb(S3C2410_RTCCON);
+               writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON);
+
+               tmp = readb(S3C2410_TICNT);
+               writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT);
+       } else {
+               /* re-enable the device, and check it is ok */
+
+               if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
+                       dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
+
+                       tmp = readb(S3C2410_RTCCON);
+                       writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON);
+               }
+
+               if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
+                       dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
+
+                       tmp = readb(S3C2410_RTCCON);
+                       writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON);
+               }
+
+               if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
+                       dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
+
+                       tmp = readb(S3C2410_RTCCON);
+                       writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON);
+               }
+       }
+}
+
+static int s3c_rtc_remove(struct platform_device *dev)
+{
+       struct rtc_device *rtc = platform_get_drvdata(dev);
+
+       platform_set_drvdata(dev, NULL);
+       rtc_device_unregister(rtc);
+
+       s3c_rtc_setpie(0);
+       s3c_rtc_setaie(0);
+
+       iounmap(s3c_rtc_base);
+       release_resource(s3c_rtc_mem);
+       kfree(s3c_rtc_mem);
+
+       return 0;
+}
+
+static int s3c_rtc_probe(struct platform_device *pdev)
+{
+       struct rtc_device *rtc;
+       struct resource *res;
+       int ret;
+
+       pr_debug("%s: probe=%p\n", __FUNCTION__, pdev);
+
+       /* find the IRQs */
+
+       s3c_rtc_tickno = platform_get_irq(pdev, 1);
+       if (s3c_rtc_tickno < 0) {
+               dev_err(&pdev->dev, "no irq for rtc tick\n");
+               return -ENOENT;
+       }
+
+       s3c_rtc_alarmno = platform_get_irq(pdev, 0);
+       if (s3c_rtc_alarmno < 0) {
+               dev_err(&pdev->dev, "no irq for alarm\n");
+               return -ENOENT;
+       }
+
+       pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
+                s3c_rtc_tickno, s3c_rtc_alarmno);
+
+       /* get the memory region */
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (res == NULL) {
+               dev_err(&pdev->dev, "failed to get memory region resource\n");
+               return -ENOENT;
+       }
+
+       s3c_rtc_mem = request_mem_region(res->start,
+                                            res->end-res->start+1,
+                                            pdev->name);
+
+       if (s3c_rtc_mem == NULL) {
+               dev_err(&pdev->dev, "failed to reserve memory region\n");
+               ret = -ENOENT;
+               goto err_nores;
+       }
+
+       s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
+       if (s3c_rtc_base == NULL) {
+               dev_err(&pdev->dev, "failed ioremap()\n");
+               ret = -EINVAL;
+               goto err_nomap;
+       }
+
+       /* check to see if everything is setup correctly */
+
+       s3c_rtc_enable(pdev, 1);
+
+       pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
+
+       s3c_rtc_setfreq(s3c_rtc_freq);
+
+       /* register RTC and exit */
+
+       rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
+                                 THIS_MODULE);
+
+       if (IS_ERR(rtc)) {
+               dev_err(&pdev->dev, "cannot attach rtc\n");
+               ret = PTR_ERR(rtc);
+               goto err_nortc;
+       }
+
+       rtc->max_user_freq = 128;
+
+       platform_set_drvdata(pdev, rtc);
+       return 0;
+
+ err_nortc:
+       s3c_rtc_enable(pdev, 0);
+       iounmap(s3c_rtc_base);
+
+ err_nomap:
+       release_resource(s3c_rtc_mem);
+
+ err_nores:
+       return ret;
+}
+
+#ifdef CONFIG_PM
+
+/* RTC Power management control */
+
+static struct timespec s3c_rtc_delta;
+
+static int ticnt_save;
+
+static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+       struct rtc_time tm;
+       struct timespec time;
+
+       time.tv_nsec = 0;
+
+       /* save TICNT for anyone using periodic interrupts */
+
+       ticnt_save = readb(S3C2410_TICNT);
+
+       /* calculate time delta for suspend */
+
+       s3c_rtc_gettime(&pdev->dev, &tm);
+       rtc_tm_to_time(&tm, &time.tv_sec);
+       save_time_delta(&s3c_rtc_delta, &time);
+       s3c_rtc_enable(pdev, 0);
+
+       return 0;
+}
+
+static int s3c_rtc_resume(struct platform_device *pdev)
+{
+       struct rtc_time tm;
+       struct timespec time;
+
+       time.tv_nsec = 0;
+
+       s3c_rtc_enable(pdev, 1);
+       s3c_rtc_gettime(&pdev->dev, &tm);
+       rtc_tm_to_time(&tm, &time.tv_sec);
+       restore_time_delta(&s3c_rtc_delta, &time);
+
+       writeb(ticnt_save, S3C2410_TICNT);
+       return 0;
+}
+#else
+#define s3c_rtc_suspend NULL
+#define s3c_rtc_resume  NULL
+#endif
+
+static struct platform_driver s3c2410_rtcdrv = {
+       .probe          = s3c_rtc_probe,
+       .remove         = s3c_rtc_remove,
+       .suspend        = s3c_rtc_suspend,
+       .resume         = s3c_rtc_resume,
+       .driver         = {
+               .name   = "s3c2410-rtc",
+               .owner  = THIS_MODULE,
+       },
+};
+
+static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
+
+static int __init s3c_rtc_init(void)
+{
+       printk(banner);
+       return platform_driver_register(&s3c2410_rtcdrv);
+}
+
+static void __exit s3c_rtc_exit(void)
+{
+       platform_driver_unregister(&s3c2410_rtcdrv);
+}
+
+module_init(s3c_rtc_init);
+module_exit(s3c_rtc_exit);
+
+MODULE_DESCRIPTION("Samsung S3C RTC Driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");