[PATCH] RTC subsystem: X1205 driver
authorAlessandro Zummo <a.zummo@towertech.it>
Mon, 27 Mar 2006 09:16:42 +0000 (01:16 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Mon, 27 Mar 2006 16:44:51 +0000 (08:44 -0800)
A port of the existing x1205 driver under the new RTC subsystem.

It is actually under test within the NSLU2 project
(http://www.nslu2-linux.org) and it is working quite well.

It is the first driver under this new subsystem and should be used as a guide
to port other drivers.

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
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-x1205.c [new file with mode: 0644]

index 8e4dc32058d620b56525519366cb9871081a965f..3de823f2f055a4685bd817294188137163267e6b 100644 (file)
@@ -76,4 +76,14 @@ config RTC_INTF_DEV
 comment "RTC drivers"
        depends on RTC_CLASS
 
+config RTC_DRV_X1205
+       tristate "Xicor/Intersil X1205"
+       depends on RTC_CLASS && I2C
+       help
+         If you say yes here you get support for the
+         Xicor/Intersil X1205 RTC chip.
+
+         This driver can also be built as a module. If so, the module
+         will be called rtc-x1205.
+
 endmenu
index 38a9212a7f3bcac759005d16a13e30873c5af4c5..eaf89b22db7a199bfc9033b3ad0e38f760c821a9 100644 (file)
@@ -10,3 +10,6 @@ rtc-core-y                    := class.o interface.o
 obj-$(CONFIG_RTC_INTF_SYSFS)   += rtc-sysfs.o
 obj-$(CONFIG_RTC_INTF_PROC)    += rtc-proc.o
 obj-$(CONFIG_RTC_INTF_DEV)     += rtc-dev.o
+
+obj-$(CONFIG_RTC_DRV_X1205)    += rtc-x1205.o
+
diff --git a/drivers/rtc/rtc-x1205.c b/drivers/rtc/rtc-x1205.c
new file mode 100644 (file)
index 0000000..621d17a
--- /dev/null
@@ -0,0 +1,619 @@
+/*
+ * An i2c driver for the Xicor/Intersil X1205 RTC
+ * Copyright 2004 Karen Spearel
+ * Copyright 2005 Alessandro Zummo
+ *
+ * please send all reports to:
+ *     Karen Spearel <kas111 at gmail dot com>
+ *     Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * based on a lot of other RTC drivers.
+ *
+ * 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 <linux/i2c.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/delay.h>
+
+#define DRV_VERSION "1.0.6"
+
+/* Addresses to scan: none. This chip is located at
+ * 0x6f and uses a two bytes register addressing.
+ * Two bytes need to be written to read a single register,
+ * while most other chips just require one and take the second
+ * one as the data to be written. To prevent corrupting
+ * unknown chips, the user must explicitely set the probe parameter.
+ */
+
+static unsigned short normal_i2c[] = { I2C_CLIENT_END };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD;
+
+/* offsets into CCR area */
+
+#define CCR_SEC                        0
+#define CCR_MIN                        1
+#define CCR_HOUR               2
+#define CCR_MDAY               3
+#define CCR_MONTH              4
+#define CCR_YEAR               5
+#define CCR_WDAY               6
+#define CCR_Y2K                        7
+
+#define X1205_REG_SR           0x3F    /* status register */
+#define X1205_REG_Y2K          0x37
+#define X1205_REG_DW           0x36
+#define X1205_REG_YR           0x35
+#define X1205_REG_MO           0x34
+#define X1205_REG_DT           0x33
+#define X1205_REG_HR           0x32
+#define X1205_REG_MN           0x31
+#define X1205_REG_SC           0x30
+#define X1205_REG_DTR          0x13
+#define X1205_REG_ATR          0x12
+#define X1205_REG_INT          0x11
+#define X1205_REG_0            0x10
+#define X1205_REG_Y2K1         0x0F
+#define X1205_REG_DWA1         0x0E
+#define X1205_REG_YRA1         0x0D
+#define X1205_REG_MOA1         0x0C
+#define X1205_REG_DTA1         0x0B
+#define X1205_REG_HRA1         0x0A
+#define X1205_REG_MNA1         0x09
+#define X1205_REG_SCA1         0x08
+#define X1205_REG_Y2K0         0x07
+#define X1205_REG_DWA0         0x06
+#define X1205_REG_YRA0         0x05
+#define X1205_REG_MOA0         0x04
+#define X1205_REG_DTA0         0x03
+#define X1205_REG_HRA0         0x02
+#define X1205_REG_MNA0         0x01
+#define X1205_REG_SCA0         0x00
+
+#define X1205_CCR_BASE         0x30    /* Base address of CCR */
+#define X1205_ALM0_BASE                0x00    /* Base address of ALARM0 */
+
+#define X1205_SR_RTCF          0x01    /* Clock failure */
+#define X1205_SR_WEL           0x02    /* Write Enable Latch */
+#define X1205_SR_RWEL          0x04    /* Register Write Enable */
+
+#define X1205_DTR_DTR0         0x01
+#define X1205_DTR_DTR1         0x02
+#define X1205_DTR_DTR2         0x04
+
+#define X1205_HR_MIL           0x80    /* Set in ccr.hour for 24 hr mode */
+
+/* Prototypes */
+static int x1205_attach(struct i2c_adapter *adapter);
+static int x1205_detach(struct i2c_client *client);
+static int x1205_probe(struct i2c_adapter *adapter, int address, int kind);
+
+static struct i2c_driver x1205_driver = {
+       .driver         = {
+               .name   = "x1205",
+       },
+       .id             = I2C_DRIVERID_X1205,
+       .attach_adapter = &x1205_attach,
+       .detach_client  = &x1205_detach,
+};
+
+/*
+ * In the routines that deal directly with the x1205 hardware, we use
+ * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
+ * Epoch is initialized as 2000. Time is set to UTC.
+ */
+static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
+                               unsigned char reg_base)
+{
+       unsigned char dt_addr[2] = { 0, reg_base };
+
+       unsigned char buf[8];
+
+       struct i2c_msg msgs[] = {
+               { client->addr, 0, 2, dt_addr },        /* setup read ptr */
+               { client->addr, I2C_M_RD, 8, buf },     /* read date */
+       };
+
+       /* read date registers */
+       if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+               dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+               return -EIO;
+       }
+
+       dev_dbg(&client->dev,
+               "%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
+               "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
+               __FUNCTION__,
+               buf[0], buf[1], buf[2], buf[3],
+               buf[4], buf[5], buf[6], buf[7]);
+
+       tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
+       tm->tm_min = BCD2BIN(buf[CCR_MIN]);
+       tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
+       tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
+       tm->tm_mon = BCD2BIN(buf[CCR_MONTH]) - 1; /* mon is 0-11 */
+       tm->tm_year = BCD2BIN(buf[CCR_YEAR])
+                       + (BCD2BIN(buf[CCR_Y2K]) * 100) - 1900;
+       tm->tm_wday = buf[CCR_WDAY];
+
+       dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
+               "mday=%d, mon=%d, year=%d, wday=%d\n",
+               __FUNCTION__,
+               tm->tm_sec, tm->tm_min, tm->tm_hour,
+               tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+       return 0;
+}
+
+static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
+{
+       static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
+
+       struct i2c_msg msgs[] = {
+               { client->addr, 0, 2, sr_addr },        /* setup read ptr */
+               { client->addr, I2C_M_RD, 1, sr },      /* read status */
+       };
+
+       /* read status register */
+       if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+               dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
+                               int datetoo, u8 reg_base)
+{
+       int i, xfer;
+       unsigned char buf[8];
+
+       static const unsigned char wel[3] = { 0, X1205_REG_SR,
+                                               X1205_SR_WEL };
+
+       static const unsigned char rwel[3] = { 0, X1205_REG_SR,
+                                               X1205_SR_WEL | X1205_SR_RWEL };
+
+       static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
+
+       dev_dbg(&client->dev,
+               "%s: secs=%d, mins=%d, hours=%d\n",
+               __FUNCTION__,
+               tm->tm_sec, tm->tm_min, tm->tm_hour);
+
+       buf[CCR_SEC] = BIN2BCD(tm->tm_sec);
+       buf[CCR_MIN] = BIN2BCD(tm->tm_min);
+
+       /* set hour and 24hr bit */
+       buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL;
+
+       /* should we also set the date? */
+       if (datetoo) {
+               dev_dbg(&client->dev,
+                       "%s: mday=%d, mon=%d, year=%d, wday=%d\n",
+                       __FUNCTION__,
+                       tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+               buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
+
+               /* month, 1 - 12 */
+               buf[CCR_MONTH] = BIN2BCD(tm->tm_mon + 1);
+
+               /* year, since the rtc epoch*/
+               buf[CCR_YEAR] = BIN2BCD(tm->tm_year % 100);
+               buf[CCR_WDAY] = tm->tm_wday & 0x07;
+               buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100);
+       }
+
+       /* this sequence is required to unlock the chip */
+       if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
+               dev_err(&client->dev, "%s: wel - %d\n", __FUNCTION__, xfer);
+               return -EIO;
+       }
+
+       if ((xfer = i2c_master_send(client, rwel, 3)) != 3) {
+               dev_err(&client->dev, "%s: rwel - %d\n", __FUNCTION__, xfer);
+               return -EIO;
+       }
+
+       /* write register's data */
+       for (i = 0; i < (datetoo ? 8 : 3); i++) {
+               unsigned char rdata[3] = { 0, reg_base + i, buf[i] };
+
+               xfer = i2c_master_send(client, rdata, 3);
+               if (xfer != 3) {
+                       dev_err(&client->dev,
+                               "%s: xfer=%d addr=%02x, data=%02x\n",
+                               __FUNCTION__,
+                                xfer, rdata[1], rdata[2]);
+                       return -EIO;
+               }
+       };
+
+       /* disable further writes */
+       if ((xfer = i2c_master_send(client, diswe, 3)) != 3) {
+               dev_err(&client->dev, "%s: diswe - %d\n", __FUNCTION__, xfer);
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int x1205_fix_osc(struct i2c_client *client)
+{
+       int err;
+       struct rtc_time tm;
+
+       tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+
+       if ((err = x1205_set_datetime(client, &tm, 0, X1205_CCR_BASE)) < 0)
+               dev_err(&client->dev,
+                       "unable to restart the oscillator\n");
+
+       return err;
+}
+
+static int x1205_get_dtrim(struct i2c_client *client, int *trim)
+{
+       unsigned char dtr;
+       static unsigned char dtr_addr[2] = { 0, X1205_REG_DTR };
+
+       struct i2c_msg msgs[] = {
+               { client->addr, 0, 2, dtr_addr },       /* setup read ptr */
+               { client->addr, I2C_M_RD, 1, &dtr },    /* read dtr */
+       };
+
+       /* read dtr register */
+       if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+               dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+               return -EIO;
+       }
+
+       dev_dbg(&client->dev, "%s: raw dtr=%x\n", __FUNCTION__, dtr);
+
+       *trim = 0;
+
+       if (dtr & X1205_DTR_DTR0)
+               *trim += 20;
+
+       if (dtr & X1205_DTR_DTR1)
+               *trim += 10;
+
+       if (dtr & X1205_DTR_DTR2)
+               *trim = -*trim;
+
+       return 0;
+}
+
+static int x1205_get_atrim(struct i2c_client *client, int *trim)
+{
+       s8 atr;
+       static unsigned char atr_addr[2] = { 0, X1205_REG_ATR };
+
+       struct i2c_msg msgs[] = {
+               { client->addr, 0, 2, atr_addr },       /* setup read ptr */
+               { client->addr, I2C_M_RD, 1, &atr },    /* read atr */
+       };
+
+       /* read atr register */
+       if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+               dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+               return -EIO;
+       }
+
+       dev_dbg(&client->dev, "%s: raw atr=%x\n", __FUNCTION__, atr);
+
+       /* atr is a two's complement value on 6 bits,
+        * perform sign extension. The formula is
+        * Catr = (atr * 0.25pF) + 11.00pF.
+        */
+       if (atr & 0x20)
+               atr |= 0xC0;
+
+       dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __FUNCTION__, atr, atr);
+
+       *trim = (atr * 250) + 11000;
+
+       dev_dbg(&client->dev, "%s: real=%d\n", __FUNCTION__, *trim);
+
+       return 0;
+}
+
+struct x1205_limit
+{
+       unsigned char reg, mask, min, max;
+};
+
+static int x1205_validate_client(struct i2c_client *client)
+{
+       int i, xfer;
+
+       /* Probe array. We will read the register at the specified
+        * address and check if the given bits are zero.
+        */
+       static const unsigned char probe_zero_pattern[] = {
+               /* register, mask */
+               X1205_REG_SR,   0x18,
+               X1205_REG_DTR,  0xF8,
+               X1205_REG_ATR,  0xC0,
+               X1205_REG_INT,  0x18,
+               X1205_REG_0,    0xFF,
+       };
+
+       static const struct x1205_limit probe_limits_pattern[] = {
+               /* register, mask, min, max */
+               { X1205_REG_Y2K,        0xFF,   19,     20      },
+               { X1205_REG_DW,         0xFF,   0,      6       },
+               { X1205_REG_YR,         0xFF,   0,      99      },
+               { X1205_REG_MO,         0xFF,   0,      12      },
+               { X1205_REG_DT,         0xFF,   0,      31      },
+               { X1205_REG_HR,         0x7F,   0,      23      },
+               { X1205_REG_MN,         0xFF,   0,      59      },
+               { X1205_REG_SC,         0xFF,   0,      59      },
+               { X1205_REG_Y2K1,       0xFF,   19,     20      },
+               { X1205_REG_Y2K0,       0xFF,   19,     20      },
+       };
+
+       /* check that registers have bits a 0 where expected */
+       for (i = 0; i < ARRAY_SIZE(probe_zero_pattern); i += 2) {
+               unsigned char buf;
+
+               unsigned char addr[2] = { 0, probe_zero_pattern[i] };
+
+               struct i2c_msg msgs[2] = {
+                       { client->addr, 0, 2, addr },
+                       { client->addr, I2C_M_RD, 1, &buf },
+               };
+
+               if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
+                       dev_err(&client->adapter->dev,
+                               "%s: could not read register %x\n",
+                               __FUNCTION__, probe_zero_pattern[i]);
+
+                       return -EIO;
+               }
+
+               if ((buf & probe_zero_pattern[i+1]) != 0) {
+                       dev_err(&client->adapter->dev,
+                               "%s: register=%02x, zero pattern=%d, value=%x\n",
+                               __FUNCTION__, probe_zero_pattern[i], i, buf);
+
+                       return -ENODEV;
+               }
+       }
+
+       /* check limits (only registers with bcd values) */
+       for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
+               unsigned char reg, value;
+
+               unsigned char addr[2] = { 0, probe_limits_pattern[i].reg };
+
+               struct i2c_msg msgs[2] = {
+                       { client->addr, 0, 2, addr },
+                       { client->addr, I2C_M_RD, 1, &reg },
+               };
+
+               if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
+                       dev_err(&client->adapter->dev,
+                               "%s: could not read register %x\n",
+                               __FUNCTION__, probe_limits_pattern[i].reg);
+
+                       return -EIO;
+               }
+
+               value = BCD2BIN(reg & probe_limits_pattern[i].mask);
+
+               if (value > probe_limits_pattern[i].max ||
+                       value < probe_limits_pattern[i].min) {
+                       dev_dbg(&client->adapter->dev,
+                               "%s: register=%x, lim pattern=%d, value=%d\n",
+                               __FUNCTION__, probe_limits_pattern[i].reg,
+                               i, value);
+
+                       return -ENODEV;
+               }
+       }
+
+       return 0;
+}
+
+static int x1205_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       return x1205_get_datetime(to_i2c_client(dev),
+               &alrm->time, X1205_ALM0_BASE);
+}
+
+static int x1205_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       return x1205_set_datetime(to_i2c_client(dev),
+               &alrm->time, 1, X1205_ALM0_BASE);
+}
+
+static int x1205_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+       return x1205_get_datetime(to_i2c_client(dev),
+               tm, X1205_CCR_BASE);
+}
+
+static int x1205_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+       return x1205_set_datetime(to_i2c_client(dev),
+               tm, 1, X1205_CCR_BASE);
+}
+
+static int x1205_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+       int err, dtrim, atrim;
+
+       seq_printf(seq, "24hr\t\t: yes\n");
+
+       if ((err = x1205_get_dtrim(to_i2c_client(dev), &dtrim)) == 0)
+               seq_printf(seq, "digital_trim\t: %d ppm\n", dtrim);
+
+       if ((err = x1205_get_atrim(to_i2c_client(dev), &atrim)) == 0)
+               seq_printf(seq, "analog_trim\t: %d.%02d pF\n",
+                       atrim / 1000, atrim % 1000);
+       return 0;
+}
+
+static struct rtc_class_ops x1205_rtc_ops = {
+       .proc           = x1205_rtc_proc,
+       .read_time      = x1205_rtc_read_time,
+       .set_time       = x1205_rtc_set_time,
+       .read_alarm     = x1205_rtc_read_alarm,
+       .set_alarm      = x1205_rtc_set_alarm,
+};
+
+static ssize_t x1205_sysfs_show_atrim(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       int atrim;
+
+       if (x1205_get_atrim(to_i2c_client(dev), &atrim) == 0)
+               return sprintf(buf, "%d.%02d pF\n",
+                       atrim / 1000, atrim % 1000);
+       return 0;
+}
+static DEVICE_ATTR(atrim, S_IRUGO, x1205_sysfs_show_atrim, NULL);
+
+static ssize_t x1205_sysfs_show_dtrim(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       int dtrim;
+
+       if (x1205_get_dtrim(to_i2c_client(dev), &dtrim) == 0)
+               return sprintf(buf, "%d ppm\n", dtrim);
+
+       return 0;
+}
+static DEVICE_ATTR(dtrim, S_IRUGO, x1205_sysfs_show_dtrim, NULL);
+
+static int x1205_attach(struct i2c_adapter *adapter)
+{
+       dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
+       return i2c_probe(adapter, &addr_data, x1205_probe);
+}
+
+static int x1205_probe(struct i2c_adapter *adapter, int address, int kind)
+{
+       int err = 0;
+       unsigned char sr;
+       struct i2c_client *client;
+       struct rtc_device *rtc;
+
+       dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
+               err = -ENODEV;
+               goto exit;
+       }
+
+       if (!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
+               err = -ENOMEM;
+               goto exit;
+       }
+
+       /* I2C client */
+       client->addr = address;
+       client->driver = &x1205_driver;
+       client->adapter = adapter;
+
+       strlcpy(client->name, x1205_driver.driver.name, I2C_NAME_SIZE);
+
+       /* Verify the chip is really an X1205 */
+       if (kind < 0) {
+               if (x1205_validate_client(client) < 0) {
+                       err = -ENODEV;
+                       goto exit_kfree;
+               }
+       }
+
+       /* Inform the i2c layer */
+       if ((err = i2c_attach_client(client)))
+               goto exit_kfree;
+
+       dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
+
+       rtc = rtc_device_register(x1205_driver.driver.name, &client->dev,
+                               &x1205_rtc_ops, THIS_MODULE);
+
+       if (IS_ERR(rtc)) {
+               err = PTR_ERR(rtc);
+               dev_err(&client->dev,
+                       "unable to register the class device\n");
+               goto exit_detach;
+       }
+
+       i2c_set_clientdata(client, rtc);
+
+       /* Check for power failures and eventualy enable the osc */
+       if ((err = x1205_get_status(client, &sr)) == 0) {
+               if (sr & X1205_SR_RTCF) {
+                       dev_err(&client->dev,
+                               "power failure detected, "
+                               "please set the clock\n");
+                       udelay(50);
+                       x1205_fix_osc(client);
+               }
+       }
+       else
+               dev_err(&client->dev, "couldn't read status\n");
+
+       device_create_file(&client->dev, &dev_attr_atrim);
+       device_create_file(&client->dev, &dev_attr_dtrim);
+
+       return 0;
+
+exit_detach:
+       i2c_detach_client(client);
+
+exit_kfree:
+       kfree(client);
+
+exit:
+       return err;
+}
+
+static int x1205_detach(struct i2c_client *client)
+{
+       int err;
+       struct rtc_device *rtc = i2c_get_clientdata(client);
+
+       dev_dbg(&client->dev, "%s\n", __FUNCTION__);
+
+       if (rtc)
+               rtc_device_unregister(rtc);
+
+       if ((err = i2c_detach_client(client)))
+               return err;
+
+       kfree(client);
+
+       return 0;
+}
+
+static int __init x1205_init(void)
+{
+       return i2c_add_driver(&x1205_driver);
+}
+
+static void __exit x1205_exit(void)
+{
+       i2c_del_driver(&x1205_driver);
+}
+
+MODULE_AUTHOR(
+       "Karen Spearel <kas111 at gmail dot com>, "
+       "Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("Xicor/Intersil X1205 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(x1205_init);
+module_exit(x1205_exit);