From: Atsushi Nemoto Date: Tue, 17 Jul 2007 11:05:02 +0000 (-0700) Subject: rtc: add rtc-m41t80 driver X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=caaff562e0ba44a7991ee8322fa4a6891d939757;p=openwrt%2Fstaging%2Fblogic.git rtc: add rtc-m41t80 driver This is a new-style i2c driver for ST M41T80 series RTC chip, derived from works by Alexander Bigga who wrote the original rtc-m41txx.c based on drivers/i2c/chips/m41t00.c driver. This driver supports M41T8[0-4] and M41ST8[457]. The old m41t00 driver supports M41T00, M41T81 and M41T85(M41ST85). While the M41T00 chip is now supported by rtc-ds1307 driver, this driver does not include support for the chip. [akpm@linux-foundation.org: remove bogus `static'] Signed-off-by: Atsushi Nemoto Signed-off-by: Alexander Bigga Acked-by: Mark A. Greer Cc: David Brownell Acked-by: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 25bea05ffaaa..fb9ce745cd30 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -212,6 +212,18 @@ config RTC_DRV_PCF8583 This driver can also be built as a module. If so, the module will be called rtc-pcf8583. +config RTC_DRV_M41T80 + tristate "ST M41T80 series RTC" + depends on RTC_CLASS && I2C + help + If you say Y here you will get support for the + ST M41T80 RTC chips series. Currently following chips are + supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85 + and M41ST87. + + This driver can also be built as a module. If so, the module + will be called rtc-m41t80. + comment "SPI RTC drivers" depends on RTC_CLASS && SPI_MASTER diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 5fb1c102f30e..6da5102e0f21 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -29,6 +29,7 @@ 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-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c new file mode 100644 index 000000000000..4875a4444216 --- /dev/null +++ b/drivers/rtc/rtc-m41t80.c @@ -0,0 +1,629 @@ +/* + * I2C client/driver for the ST M41T80 family of i2c rtc chips. + * + * Author: Alexander Bigga + * + * Based on m41t00.c by Mark A. Greer + * + * 2006 (c) mycable GmbH + * + * 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. + * + */ + +#include +#include +#include +#include +#include +#include +#include + +#define M41T80_REG_SSEC 0 +#define M41T80_REG_SEC 1 +#define M41T80_REG_MIN 2 +#define M41T80_REG_HOUR 3 +#define M41T80_REG_WDAY 4 +#define M41T80_REG_DAY 5 +#define M41T80_REG_MON 6 +#define M41T80_REG_YEAR 7 +#define M41T80_REG_ALARM_MON 0xa +#define M41T80_REG_ALARM_DAY 0xb +#define M41T80_REG_ALARM_HOUR 0xc +#define M41T80_REG_ALARM_MIN 0xd +#define M41T80_REG_ALARM_SEC 0xe +#define M41T80_REG_FLAGS 0xf +#define M41T80_REG_SQW 0x13 + +#define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1) +#define M41T80_ALARM_REG_SIZE \ + (M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON) + +#define M41T80_SEC_ST (1 << 7) /* ST: Stop Bit */ +#define M41T80_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ +#define M41T80_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ +#define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ +#define M41T80_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ +#define M41T80_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ + +#define M41T80_FEATURE_HT (1 << 0) +#define M41T80_FEATURE_BL (1 << 1) + +#define DRV_VERSION "0.05" + +struct m41t80_chip_info { + const char *name; + u8 features; +}; + +static const struct m41t80_chip_info m41t80_chip_info_tbl[] = { + { + .name = "m41t80", + .features = 0, + }, + { + .name = "m41t81", + .features = M41T80_FEATURE_HT, + }, + { + .name = "m41t81s", + .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, + }, + { + .name = "m41t82", + .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, + }, + { + .name = "m41t83", + .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, + }, + { + .name = "m41st84", + .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, + }, + { + .name = "m41st85", + .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, + }, + { + .name = "m41st87", + .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, + }, +}; + +struct m41t80_data { + const struct m41t80_chip_info *chip; + struct rtc_device *rtc; +}; + +static int m41t80_get_datetime(struct i2c_client *client, + struct rtc_time *tm) +{ + u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = dt_addr, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, + .buf = buf + M41T80_REG_SEC, + }, + }; + + if (i2c_transfer(client->adapter, msgs, 2) < 0) { + dev_err(&client->dev, "read error\n"); + return -EIO; + } + + tm->tm_sec = BCD2BIN(buf[M41T80_REG_SEC] & 0x7f); + tm->tm_min = BCD2BIN(buf[M41T80_REG_MIN] & 0x7f); + tm->tm_hour = BCD2BIN(buf[M41T80_REG_HOUR] & 0x3f); + tm->tm_mday = BCD2BIN(buf[M41T80_REG_DAY] & 0x3f); + tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; + tm->tm_mon = BCD2BIN(buf[M41T80_REG_MON] & 0x1f) - 1; + + /* assume 20YY not 19YY, and ignore the Century Bit */ + tm->tm_year = BCD2BIN(buf[M41T80_REG_YEAR]) + 100; + return 0; +} + +/* Sets the given date and time to the real time clock. */ +static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) +{ + u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; + u8 *buf = &wbuf[1]; + u8 dt_addr[1] = { M41T80_REG_SEC }; + struct i2c_msg msgs_in[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = dt_addr, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, + .buf = buf + M41T80_REG_SEC, + }, + }; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1 + M41T80_DATETIME_REG_SIZE, + .buf = wbuf, + }, + }; + + /* Read current reg values into buf[1..7] */ + if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { + dev_err(&client->dev, "read error\n"); + return -EIO; + } + + wbuf[0] = 0; /* offset into rtc's regs */ + /* Merge time-data and register flags into buf[0..7] */ + buf[M41T80_REG_SSEC] = 0; + buf[M41T80_REG_SEC] = + BIN2BCD(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); + buf[M41T80_REG_MIN] = + BIN2BCD(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); + buf[M41T80_REG_HOUR] = + BIN2BCD(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ; + buf[M41T80_REG_WDAY] = + (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); + buf[M41T80_REG_DAY] = + BIN2BCD(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); + buf[M41T80_REG_MON] = + BIN2BCD(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); + /* assume 20YY not 19YY */ + buf[M41T80_REG_YEAR] = BIN2BCD(tm->tm_year % 100); + + if (i2c_transfer(client->adapter, msgs, 1) != 1) { + dev_err(&client->dev, "write error\n"); + return -EIO; + } + return 0; +} + +#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) +static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) +{ + struct i2c_client *client = to_i2c_client(dev); + struct m41t80_data *clientdata = i2c_get_clientdata(client); + u8 reg; + + if (clientdata->chip->features & M41T80_FEATURE_BL) { + reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); + seq_printf(seq, "battery\t\t: %s\n", + (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); + } + return 0; +} +#else +#define m41t80_rtc_proc NULL +#endif + +static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + return m41t80_get_datetime(to_i2c_client(dev), tm); +} + +static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + return m41t80_set_datetime(to_i2c_client(dev), tm); +} + +#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) +static int +m41t80_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + struct i2c_client *client = to_i2c_client(dev); + int rc; + + switch (cmd) { + case RTC_AIE_OFF: + case RTC_AIE_ON: + break; + default: + return -ENOIOCTLCMD; + } + + rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); + if (rc < 0) + goto err; + switch (cmd) { + case RTC_AIE_OFF: + rc &= ~M41T80_ALMON_AFE; + break; + case RTC_AIE_ON: + rc |= M41T80_ALMON_AFE; + break; + } + if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) + goto err; + return 0; +err: + return -EIO; +} +#else +#define m41t80_rtc_ioctl NULL +#endif + +static int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) +{ + struct i2c_client *client = to_i2c_client(dev); + u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; + u8 *buf = &wbuf[1]; + u8 *reg = buf - M41T80_REG_ALARM_MON; + u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; + struct i2c_msg msgs_in[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = dt_addr, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = M41T80_ALARM_REG_SIZE, + .buf = buf, + }, + }; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1 + M41T80_ALARM_REG_SIZE, + .buf = wbuf, + }, + }; + + if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { + dev_err(&client->dev, "read error\n"); + return -EIO; + } + reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); + reg[M41T80_REG_ALARM_DAY] = 0; + reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); + reg[M41T80_REG_ALARM_MIN] = 0; + reg[M41T80_REG_ALARM_SEC] = 0; + + wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ + reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? + BIN2BCD(t->time.tm_sec) : 0x80; + reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? + BIN2BCD(t->time.tm_min) : 0x80; + reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? + BIN2BCD(t->time.tm_hour) : 0x80; + reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? + BIN2BCD(t->time.tm_mday) : 0x80; + if (t->time.tm_mon >= 0) + reg[M41T80_REG_ALARM_MON] |= BIN2BCD(t->time.tm_mon + 1); + else + reg[M41T80_REG_ALARM_DAY] |= 0x40; + + if (i2c_transfer(client->adapter, msgs, 1) != 1) { + dev_err(&client->dev, "write error\n"); + return -EIO; + } + + if (t->enabled) { + reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; + if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, + reg[M41T80_REG_ALARM_MON]) < 0) { + dev_err(&client->dev, "write error\n"); + return -EIO; + } + } + return 0; +} + +static int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) +{ + struct i2c_client *client = to_i2c_client(dev); + u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ + u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; + u8 *reg = buf - M41T80_REG_ALARM_MON; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = dt_addr, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = M41T80_ALARM_REG_SIZE + 1, + .buf = buf, + }, + }; + + if (i2c_transfer(client->adapter, msgs, 2) < 0) { + dev_err(&client->dev, "read error\n"); + return -EIO; + } + t->time.tm_sec = -1; + t->time.tm_min = -1; + t->time.tm_hour = -1; + t->time.tm_mday = -1; + t->time.tm_mon = -1; + if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) + t->time.tm_sec = BCD2BIN(reg[M41T80_REG_ALARM_SEC] & 0x7f); + if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) + t->time.tm_min = BCD2BIN(reg[M41T80_REG_ALARM_MIN] & 0x7f); + if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) + t->time.tm_hour = BCD2BIN(reg[M41T80_REG_ALARM_HOUR] & 0x3f); + if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) + t->time.tm_mday = BCD2BIN(reg[M41T80_REG_ALARM_DAY] & 0x3f); + if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) + t->time.tm_mon = BCD2BIN(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; + t->time.tm_year = -1; + t->time.tm_wday = -1; + t->time.tm_yday = -1; + t->time.tm_isdst = -1; + t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); + t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); + return 0; +} + +static struct rtc_class_ops m41t80_rtc_ops = { + .read_time = m41t80_rtc_read_time, + .set_time = m41t80_rtc_set_time, + .read_alarm = m41t80_rtc_read_alarm, + .set_alarm = m41t80_rtc_set_alarm, + .proc = m41t80_rtc_proc, + .ioctl = m41t80_rtc_ioctl, +}; + +#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) +static ssize_t m41t80_sysfs_show_flags(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + int val; + + val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); + if (val < 0) + return -EIO; + return sprintf(buf, "%#x\n", val); +} +static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); + +static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + int val; + + val = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); + if (val < 0) + return -EIO; + val = (val >> 4) & 0xf; + switch (val) { + case 0: + break; + case 1: + val = 32768; + break; + default: + val = 32768 >> val; + } + return sprintf(buf, "%d\n", val); +} +static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + int almon, sqw; + int val = simple_strtoul(buf, NULL, 0); + + if (val) { + if (!is_power_of_2(val)) + return -EINVAL; + val = ilog2(val); + if (val == 15) + val = 1; + else if (val < 14) + val = 15 - val; + else + return -EINVAL; + } + /* disable SQW, set SQW frequency & re-enable */ + almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); + if (almon < 0) + return -EIO; + sqw = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); + if (sqw < 0) + return -EIO; + sqw = (sqw & 0x0f) | (val << 4); + if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, + almon & ~M41T80_ALMON_SQWE) < 0 || + i2c_smbus_write_byte_data(client, M41T80_REG_SQW, sqw) < 0) + return -EIO; + if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, + almon | M41T80_ALMON_SQWE) < 0) + return -EIO; + return count; +} +static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, + m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); + +static struct attribute *attrs[] = { + &dev_attr_flags.attr, + &dev_attr_sqwfreq.attr, + NULL, +}; +static struct attribute_group attr_group = { + .attrs = attrs, +}; + +static int m41t80_sysfs_register(struct device *dev) +{ + return sysfs_create_group(&dev->kobj, &attr_group); +} +#else +static int m41t80_sysfs_register(struct device *dev) +{ + return 0; +} +#endif + +/* + ***************************************************************************** + * + * Driver Interface + * + ***************************************************************************** + */ +static int m41t80_probe(struct i2c_client *client) +{ + int i, rc = 0; + struct rtc_device *rtc = NULL; + struct rtc_time tm; + const struct m41t80_chip_info *chip; + struct m41t80_data *clientdata = NULL; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C + | I2C_FUNC_SMBUS_BYTE_DATA)) { + rc = -ENODEV; + goto exit; + } + + dev_info(&client->dev, + "chip found, driver version " DRV_VERSION "\n"); + + chip = NULL; + for (i = 0; i < ARRAY_SIZE(m41t80_chip_info_tbl); i++) { + if (!strcmp(m41t80_chip_info_tbl[i].name, client->name)) { + chip = &m41t80_chip_info_tbl[i]; + break; + } + } + if (!chip) { + dev_err(&client->dev, "%s is not supported\n", client->name); + rc = -ENODEV; + goto exit; + } + + clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); + if (!clientdata) { + rc = -ENOMEM; + goto exit; + } + + rtc = rtc_device_register(client->name, &client->dev, + &m41t80_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc)) { + rc = PTR_ERR(rtc); + rtc = NULL; + goto exit; + } + + clientdata->rtc = rtc; + clientdata->chip = chip; + i2c_set_clientdata(client, clientdata); + + /* Make sure HT (Halt Update) bit is cleared */ + rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); + if (rc < 0) + goto ht_err; + + if (rc & M41T80_ALHOUR_HT) { + if (chip->features & M41T80_FEATURE_HT) { + m41t80_get_datetime(client, &tm); + dev_info(&client->dev, "HT bit was set!\n"); + dev_info(&client->dev, + "Power Down at " + "%04i-%02i-%02i %02i:%02i:%02i\n", + tm.tm_year + 1900, + tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, + tm.tm_min, tm.tm_sec); + } + if (i2c_smbus_write_byte_data(client, + M41T80_REG_ALARM_HOUR, + rc & ~M41T80_ALHOUR_HT) < 0) + goto ht_err; + } + + /* Make sure ST (stop) bit is cleared */ + rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); + if (rc < 0) + goto st_err; + + if (rc & M41T80_SEC_ST) { + if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, + rc & ~M41T80_SEC_ST) < 0) + goto st_err; + } + + rc = m41t80_sysfs_register(&client->dev); + if (rc) + goto exit; + + return 0; + +st_err: + rc = -EIO; + dev_err(&client->dev, "Can't clear ST bit\n"); + goto exit; +ht_err: + rc = -EIO; + dev_err(&client->dev, "Can't clear HT bit\n"); + goto exit; + +exit: + if (rtc) + rtc_device_unregister(rtc); + kfree(clientdata); + return rc; +} + +static int m41t80_remove(struct i2c_client *client) +{ + struct m41t80_data *clientdata = i2c_get_clientdata(client); + struct rtc_device *rtc = clientdata->rtc; + + if (rtc) + rtc_device_unregister(rtc); + kfree(clientdata); + + return 0; +} + +static struct i2c_driver m41t80_driver = { + .driver = { + .name = "m41t80", + }, + .probe = m41t80_probe, + .remove = m41t80_remove, +}; + +static int __init m41t80_rtc_init(void) +{ + return i2c_add_driver(&m41t80_driver); +} + +static void __exit m41t80_rtc_exit(void) +{ + i2c_del_driver(&m41t80_driver); +} + +MODULE_AUTHOR("Alexander Bigga "); +MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); + +module_init(m41t80_rtc_init); +module_exit(m41t80_rtc_exit);