static int cmos_irq_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-- > 16)
return -EINVAL;
f = 16 - f;
spin_lock_irqsave(&rtc_lock, flags);
hpet_set_periodic_freq(freq);
CMOS_WRITE(RTC_REF_CLCK_32KHZ | f, RTC_FREQ_SELECT);
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
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;
unsigned address_space;
/* there can be only one ... */
if (cmos_rtc.dev)
return -EBUSY;
if (!ports)
return -ENODEV;
/* Claim I/O ports ASAP, minimizing conflict with legacy driver.
*
* REVISIT non-x86 systems may instead use memory space resources
* (needing ioremap etc), not i/o space resources like this ...
*/
ports = request_region(ports->start,
resource_size(ports),
driver_name);
if (!ports) {
dev_dbg(dev, "i/o registers already in use\n");
return -EBUSY;
}
cmos_rtc.irq = rtc_irq;
cmos_rtc.iomem = ports;
/* Heuristic to deduce NVRAM size ... do what the legacy NVRAM
* driver did, but don't reject unknown configs. Old hardware
* won't address 128 bytes. Newer chips have multiple banks,
* though they may not be listed in one I/O resource.
*/
#if defined(CONFIG_ATARI)
address_space = 64;
#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \
|| defined(__sparc__) || defined(__mips__) \
|| defined(__powerpc__)
address_space = 128;
#else
#warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes.
address_space = 128;
#endif
if (can_bank2 && ports->end > (ports->start + 1))
address_space = 256;
/* For ACPI systems extension info comes from the FADT. On others,
* board specific setup provides it as appropriate. Systems where
* the alarm IRQ isn't automatically a wakeup IRQ (like ACPI, and
* some almost-clones) can provide hooks to make that behave.
*
* Note that ACPI doesn't preclude putting these registers into
* "extended" areas of the chip, including some that we won't yet
* expect CMOS_READ and friends to handle.
*/
if (info) {
if (info->rtc_day_alarm && info->rtc_day_alarm < 128)
cmos_rtc.day_alrm = info->rtc_day_alarm;
if (info->rtc_mon_alarm && info->rtc_mon_alarm < 128)
cmos_rtc.mon_alrm = info->rtc_mon_alarm;
if (info->rtc_century && info->rtc_century < 128)
cmos_rtc.century = info->rtc_century;
if (info->wake_on && info->wake_off) {
cmos_rtc.wake_on = info->wake_on;
cmos_rtc.wake_off = info->wake_off;
}
}
cmos_rtc.dev = dev;
dev_set_drvdata(dev, &cmos_rtc);
cmos_rtc.rtc = rtc_device_register(driver_name, dev,
&cmos_rtc_ops, THIS_MODULE);
if (IS_ERR(cmos_rtc.rtc)) {
retval = PTR_ERR(cmos_rtc.rtc);
goto cleanup0;
}
rename_region(ports, dev_name(&cmos_rtc.rtc->dev));
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_rtc.rtc->irq_freq = 1024;
hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
/* disable irqs */
cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE);
rtc_control = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
/* FIXME:
* <asm-generic/rtc.h> doesn't know 12-hour mode either.
*/
if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) {
dev_warn(dev, "only 24-hr supported\n");
retval = -ENXIO;
goto cleanup1;
}
if (is_valid_irq(rtc_irq)) {
irq_handler_t rtc_cmos_int_handler;
if (is_hpet_enabled()) {
int err;
rtc_cmos_int_handler = hpet_rtc_interrupt;
err = hpet_register_irq_handler(cmos_interrupt);
if (err != 0) {
dev_warn(dev, "hpet_register_irq_handler "
" failed in rtc_init().");
goto cleanup1;
}
} else
rtc_cmos_int_handler = cmos_interrupt;
retval = request_irq(rtc_irq, rtc_cmos_int_handler,
0, dev_name(&cmos_rtc.rtc->dev),
cmos_rtc.rtc);
if (retval < 0) {
dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
goto cleanup1;
}
}
hpet_rtc_timer_init();
/* export at least the first block of NVRAM */
nvram.size = address_space - NVRAM_OFFSET;
retval = sysfs_create_bin_file(&dev->kobj, &nvram);
if (retval < 0) {
dev_dbg(dev, "can't create nvram file? %d\n", retval);
goto cleanup2;
}
dev_info(dev, "%s%s, %zd bytes nvram%s\n",
!is_valid_irq(rtc_irq) ? "no alarms" :
cmos_rtc.mon_alrm ? "alarms up to one year" :
cmos_rtc.day_alrm ? "alarms up to one month" :
"alarms up to one day",
cmos_rtc.century ? ", y3k" : "",
nvram.size,
is_hpet_enabled() ? ", hpet irqs" : "");
return 0;
cleanup2:
if (is_valid_irq(rtc_irq))
free_irq(rtc_irq, cmos_rtc.rtc);
cleanup1:
cmos_rtc.dev = NULL;
rtc_device_unregister(cmos_rtc.rtc);
cleanup0:
release_region(ports->start, resource_size(ports));
return retval;
}
static int __init rtc_init(void)
{
struct proc_dir_entry *ent;
#if defined(__alpha__) || defined(__mips__)
unsigned int year, ctrl;
char *guess = NULL;
#endif
#ifdef __sparc__
struct linux_ebus *ebus;
struct linux_ebus_device *edev;
#ifdef __sparc_v9__
struct sparc_isa_bridge *isa_br;
struct sparc_isa_device *isa_dev;
#endif
#endif
#ifdef __sparc__
for_each_ebus(ebus) {
for_each_ebusdev(edev, ebus) {
if(strcmp(edev->prom_name, "rtc") == 0) {
rtc_port = edev->resource[0].start;
rtc_irq = edev->irqs[0];
goto found;
}
}
}
#ifdef __sparc_v9__
for_each_isa(isa_br) {
for_each_isadev(isa_dev, isa_br) {
if (strcmp(isa_dev->prom_name, "rtc") == 0) {
rtc_port = isa_dev->resource.start;
rtc_irq = isa_dev->irq;
goto found;
}
}
}
#endif
printk(KERN_ERR "rtc_init: no PC rtc found\n");
return -EIO;
found:
if (rtc_irq == PCI_IRQ_NONE) {
rtc_has_irq = 0;
goto no_irq;
}
/*
* XXX Interrupt pin #7 in Espresso is shared between RTC and
* PCI Slot 2 INTA# (and some INTx# in Slot 1).
*/
if (request_irq(rtc_irq, rtc_interrupt, SA_SHIRQ, "rtc", (void *)&rtc_port)) {
/*
* Standard way for sparc to print irq's is to use
* __irq_itoa(). I think for EBus it's ok to use %d.
*/
printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq);
return -EIO;
}
no_irq:
#else
if (!request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc")) {
printk(KERN_ERR "rtc: I/O port %d is not free.\n", RTC_PORT (0));
return -EIO;
}
#ifdef RTC_IRQ
if (is_hpet_enabled()) {
rtc_int_handler_ptr = hpet_rtc_interrupt;
} else {
rtc_int_handler_ptr = rtc_interrupt;
}
if(request_irq(RTC_IRQ, rtc_int_handler_ptr, SA_INTERRUPT, "rtc", NULL)) {
/* Yeah right, seeing as irq 8 doesn't even hit the bus. */
printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ);
release_region(RTC_PORT(0), RTC_IO_EXTENT);
return -EIO;
}
hpet_rtc_timer_init();
#endif
#endif /* __sparc__ vs. others */
if (misc_register(&rtc_dev)) {
#ifdef RTC_IRQ
free_irq(RTC_IRQ, NULL);
#endif
release_region(RTC_PORT(0), RTC_IO_EXTENT);
return -ENODEV;
}
ent = create_proc_entry("driver/rtc", 0, NULL);
if (!ent) {
#ifdef RTC_IRQ
free_irq(RTC_IRQ, NULL);
#endif
release_region(RTC_PORT(0), RTC_IO_EXTENT);
misc_deregister(&rtc_dev);
return -ENOMEM;
}
ent->proc_fops = &rtc_proc_fops;
#if defined(__alpha__) || defined(__mips__)
rtc_freq = HZ;
/* Each operating system on an Alpha uses its own epoch.
Let's try to guess which one we are using now. */
if (rtc_is_updating() != 0)
msleep(20);
spin_lock_irq(&rtc_lock);
year = CMOS_READ(RTC_YEAR);
ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
BCD_TO_BIN(year); /* This should never happen... */
if (year < 20) {
epoch = 2000;
guess = "SRM (post-2000)";
} else if (year >= 20 && year < 48) {
epoch = 1980;
guess = "ARC console";
} else if (year >= 48 && year < 72) {
epoch = 1952;
guess = "Digital UNIX";
#if defined(__mips__)
} else if (year >= 72 && year < 74) {
epoch = 2000;
guess = "Digital DECstation";
#else
} else if (year >= 70) {
epoch = 1900;
guess = "Standard PC (1900)";
#endif
}
if (guess)
printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", guess, epoch);
#endif
#ifdef RTC_IRQ
if (rtc_has_irq == 0)
goto no_irq2;
init_timer(&rtc_irq_timer);
rtc_irq_timer.function = rtc_dropped_irq;
spin_lock_irq(&rtc_lock);
rtc_freq = 1024;
if (!hpet_set_periodic_freq(rtc_freq)) {
/* Initialize periodic freq. to CMOS reset default, which is 1024Hz */
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT);
}
spin_unlock_irq(&rtc_lock);
no_irq2:
#endif
(void) init_sysctl();
printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n");
return 0;
}
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;
unsigned address_space;
if (cmos_rtc.dev)
return -EBUSY;
if (!ports)
return -ENODEV;
ports = request_region(ports->start,
resource_size(ports),
driver_name);
if (!ports) {
dev_dbg(dev, "i/o registers already in use\n");
return -EBUSY;
}
cmos_rtc.irq = rtc_irq;
cmos_rtc.iomem = ports;
#if defined(CONFIG_ATARI)
address_space = 64;
#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \
|| defined(__sparc__) || defined(__mips__) \
|| defined(__powerpc__)
address_space = 128;
#else
#warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes.
address_space = 128;
#endif
if (can_bank2 && ports->end > (ports->start + 1))
address_space = 256;
if (info) {
if (info->rtc_day_alarm && info->rtc_day_alarm < 128)
cmos_rtc.day_alrm = info->rtc_day_alarm;
if (info->rtc_mon_alarm && info->rtc_mon_alarm < 128)
cmos_rtc.mon_alrm = info->rtc_mon_alarm;
if (info->rtc_century && info->rtc_century < 128)
cmos_rtc.century = info->rtc_century;
if (info->wake_on && info->wake_off) {
cmos_rtc.wake_on = info->wake_on;
cmos_rtc.wake_off = info->wake_off;
}
}
cmos_rtc.dev = dev;
dev_set_drvdata(dev, &cmos_rtc);
cmos_rtc.rtc = rtc_device_register(driver_name, dev,
&cmos_rtc_ops, THIS_MODULE);
if (IS_ERR(cmos_rtc.rtc)) {
retval = PTR_ERR(cmos_rtc.rtc);
goto cleanup0;
}
rename_region(ports, dev_name(&cmos_rtc.rtc->dev));
spin_lock_irq(&rtc_lock);
cmos_rtc.rtc->irq_freq = 1024;
hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE);
rtc_control = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) {
dev_warn(dev, "only 24-hr supported\n");
retval = -ENXIO;
goto cleanup1;
}
if (is_valid_irq(rtc_irq)) {
irq_handler_t rtc_cmos_int_handler;
if (is_hpet_enabled()) {
int err;
rtc_cmos_int_handler = hpet_rtc_interrupt;
err = hpet_register_irq_handler(cmos_interrupt);
if (err != 0) {
printk(KERN_WARNING "hpet_register_irq_handler "
" failed in rtc_init().");
goto cleanup1;
}
} else
rtc_cmos_int_handler = cmos_interrupt;
retval = request_irq(rtc_irq, rtc_cmos_int_handler,
0, dev_name(&cmos_rtc.rtc->dev),
cmos_rtc.rtc);
if (retval < 0) {
dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
goto cleanup1;
}
}
hpet_rtc_timer_init();
nvram.size = address_space - NVRAM_OFFSET;
retval = sysfs_create_bin_file(&dev->kobj, &nvram);
if (retval < 0) {
dev_dbg(dev, "can't create nvram file? %d\n", retval);
goto cleanup2;
}
pr_info("%s: %s%s, %zd bytes nvram%s\n",
dev_name(&cmos_rtc.rtc->dev),
!is_valid_irq(rtc_irq) ? "no alarms" :
cmos_rtc.mon_alrm ? "alarms up to one year" :
cmos_rtc.day_alrm ? "alarms up to one month" :
"alarms up to one day",
cmos_rtc.century ? ", y3k" : "",
nvram.size,
is_hpet_enabled() ? ", hpet irqs" : "");
return 0;
cleanup2:
if (is_valid_irq(rtc_irq))
free_irq(rtc_irq, cmos_rtc.rtc);
cleanup1:
cmos_rtc.dev = NULL;
rtc_device_unregister(cmos_rtc.rtc);
cleanup0:
release_region(ports->start, resource_size(ports));
return retval;
}
static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
{
struct rtc_time wtime;
#ifdef RTC_IRQ
if (rtc_has_irq == 0) {
switch (cmd) {
case RTC_AIE_OFF:
case RTC_AIE_ON:
case RTC_PIE_OFF:
case RTC_PIE_ON:
case RTC_UIE_OFF:
case RTC_UIE_ON:
case RTC_IRQP_READ:
case RTC_IRQP_SET:
return -EINVAL;
};
}
#endif
switch (cmd) {
#ifdef RTC_IRQ
case RTC_AIE_OFF: /* Mask alarm int. enab. bit */
{
mask_rtc_irq_bit(RTC_AIE);
return 0;
}
case RTC_AIE_ON: /* Allow alarm interrupts. */
{
set_rtc_irq_bit(RTC_AIE);
return 0;
}
case RTC_PIE_OFF: /* Mask periodic int. enab. bit */
{
unsigned long flags; /* can be called from isr via rtc_control() */
spin_lock_irqsave (&rtc_lock, flags);
mask_rtc_irq_bit_locked(RTC_PIE);
if (rtc_status & RTC_TIMER_ON) {
rtc_status &= ~RTC_TIMER_ON;
del_timer(&rtc_irq_timer);
}
spin_unlock_irqrestore (&rtc_lock, flags);
return 0;
}
case RTC_PIE_ON: /* Allow periodic ints */
{
unsigned long flags; /* can be called from isr via rtc_control() */
/*
* We don't really want Joe User enabling more
* than 64Hz of interrupts on a multi-user machine.
*/
if (!kernel && (rtc_freq > rtc_max_user_freq) &&
(!capable(CAP_SYS_RESOURCE)))
return -EACCES;
spin_lock_irqsave (&rtc_lock, flags);
if (!(rtc_status & RTC_TIMER_ON)) {
rtc_irq_timer.expires = jiffies + HZ/rtc_freq + 2*HZ/100;
add_timer(&rtc_irq_timer);
rtc_status |= RTC_TIMER_ON;
}
set_rtc_irq_bit_locked(RTC_PIE);
spin_unlock_irqrestore (&rtc_lock, flags);
return 0;
}
case RTC_UIE_OFF: /* Mask ints from RTC updates. */
{
mask_rtc_irq_bit(RTC_UIE);
return 0;
}
case RTC_UIE_ON: /* Allow ints for RTC updates. */
{
set_rtc_irq_bit(RTC_UIE);
return 0;
}
#endif
case RTC_ALM_READ: /* Read the present alarm time */
{
/*
* This returns a struct rtc_time. Reading >= 0xc0
* means "don't care" or "match all". Only the tm_hour,
* tm_min, and tm_sec values are filled in.
*/
memset(&wtime, 0, sizeof(struct rtc_time));
get_rtc_alm_time(&wtime);
break;
}
case RTC_ALM_SET: /* Store a time into the alarm */
{
/*
* This expects a struct rtc_time. Writing 0xff means
* "don't care" or "match all". Only the tm_hour,
* tm_min and tm_sec are used.
*/
unsigned char hrs, min, sec;
struct rtc_time alm_tm;
if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg,
sizeof(struct rtc_time)))
return -EFAULT;
hrs = alm_tm.tm_hour;
min = alm_tm.tm_min;
sec = alm_tm.tm_sec;
spin_lock_irq(&rtc_lock);
if (hpet_set_alarm_time(hrs, min, sec)) {
/*
* Fallthru and set alarm time in CMOS too,
* so that we will get proper value in RTC_ALM_READ
*/
}
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) ||
RTC_ALWAYS_BCD)
{
if (sec < 60) BIN_TO_BCD(sec);
else sec = 0xff;
if (min < 60) BIN_TO_BCD(min);
else min = 0xff;
if (hrs < 24) BIN_TO_BCD(hrs);
else hrs = 0xff;
}
CMOS_WRITE(hrs, RTC_HOURS_ALARM);
CMOS_WRITE(min, RTC_MINUTES_ALARM);
CMOS_WRITE(sec, RTC_SECONDS_ALARM);
spin_unlock_irq(&rtc_lock);
return 0;
}
case RTC_RD_TIME: /* Read the time/date from RTC */
{
memset(&wtime, 0, sizeof(struct rtc_time));
rtc_get_rtc_time(&wtime);
break;
}
case RTC_SET_TIME: /* Set the RTC */
{
struct rtc_time rtc_tm;
unsigned char mon, day, hrs, min, sec, leap_yr;
unsigned char save_control, save_freq_select;
unsigned int yrs;
#ifdef CONFIG_MACH_DECSTATION
unsigned int real_yrs;
#endif
if (!capable(CAP_SYS_TIME))
return -EACCES;
if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg,
sizeof(struct rtc_time)))
return -EFAULT;
yrs = rtc_tm.tm_year + 1900;
mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
day = rtc_tm.tm_mday;
hrs = rtc_tm.tm_hour;
min = rtc_tm.tm_min;
sec = rtc_tm.tm_sec;
if (yrs < 1970)
return -EINVAL;
leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
if ((mon > 12) || (day == 0))
return -EINVAL;
if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
return -EINVAL;
if ((hrs >= 24) || (min >= 60) || (sec >= 60))
return -EINVAL;
if ((yrs -= epoch) > 255) /* They are unsigned */
return -EINVAL;
spin_lock_irq(&rtc_lock);
#ifdef CONFIG_MACH_DECSTATION
real_yrs = yrs;
yrs = 72;
/*
* We want to keep the year set to 73 until March
* for non-leap years, so that Feb, 29th is handled
* correctly.
*/
if (!leap_yr && mon < 3) {
real_yrs--;
yrs = 73;
}
#endif
/* These limits and adjustments are independent of
* whether the chip is in binary mode or not.
*/
if (yrs > 169) {
spin_unlock_irq(&rtc_lock);
return -EINVAL;
}
if (yrs >= 100)
yrs -= 100;
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY)
|| RTC_ALWAYS_BCD) {
BIN_TO_BCD(sec);
BIN_TO_BCD(min);
BIN_TO_BCD(hrs);
BIN_TO_BCD(day);
BIN_TO_BCD(mon);
BIN_TO_BCD(yrs);
}
save_control = CMOS_READ(RTC_CONTROL);
CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
#ifdef CONFIG_MACH_DECSTATION
CMOS_WRITE(real_yrs, RTC_DEC_YEAR);
#endif
CMOS_WRITE(yrs, RTC_YEAR);
CMOS_WRITE(mon, RTC_MONTH);
CMOS_WRITE(day, RTC_DAY_OF_MONTH);
CMOS_WRITE(hrs, RTC_HOURS);
CMOS_WRITE(min, RTC_MINUTES);
CMOS_WRITE(sec, RTC_SECONDS);
CMOS_WRITE(save_control, RTC_CONTROL);
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
spin_unlock_irq(&rtc_lock);
return 0;
}
#ifdef RTC_IRQ
case RTC_IRQP_READ: /* Read the periodic IRQ rate. */
{
return put_user(rtc_freq, (unsigned long __user *)arg);
}
case RTC_IRQP_SET: /* Set periodic IRQ rate. */
{
int tmp = 0;
unsigned char val;
unsigned long flags; /* can be called from isr via rtc_control() */
/*
* The max we can do is 8192Hz.
*/
if ((arg < 2) || (arg > 8192))
return -EINVAL;
/*
* We don't really want Joe User generating more
* than 64Hz of interrupts on a multi-user machine.
*/
if (!kernel && (arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE)))
return -EACCES;
while (arg > (1<<tmp))
tmp++;
/*
* Check that the input was really a power of 2.
*/
if (arg != (1<<tmp))
return -EINVAL;
spin_lock_irqsave(&rtc_lock, flags);
if (hpet_set_periodic_freq(arg)) {
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
rtc_freq = arg;
val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0;
val |= (16 - tmp);
CMOS_WRITE(val, RTC_FREQ_SELECT);
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
#endif
case RTC_EPOCH_READ: /* Read the epoch. */
{
return put_user (epoch, (unsigned long __user *)arg);
}
case RTC_EPOCH_SET: /* Set the epoch. */
{
/*
* There were no RTC clocks before 1900.
*/
if (arg < 1900)
return -EINVAL;
if (!capable(CAP_SYS_TIME))
return -EACCES;
epoch = arg;
return 0;
}
default:
return -ENOTTY;
}
return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
}
