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-rw-r--r--packages/linux/openslug-kernel-2.6.11.2/x1205-rtc.c552
1 files changed, 552 insertions, 0 deletions
diff --git a/packages/linux/openslug-kernel-2.6.11.2/x1205-rtc.c b/packages/linux/openslug-kernel-2.6.11.2/x1205-rtc.c
index e69de29bb2..9a9831b682 100644
--- a/packages/linux/openslug-kernel-2.6.11.2/x1205-rtc.c
+++ b/packages/linux/openslug-kernel-2.6.11.2/x1205-rtc.c
@@ -0,0 +1,552 @@
+/*
+ x1205 - an 12c driver for the Xicor X1205 RTC
+ Copyright 2004 Karen Spearel
+
+ please send all reports to:
+ kas11 at tampabay dot rr dot com
+
+ based on linux/drivers/acron/char/pcf8583.h
+ Copyright (C) 2000 Russell King
+
+ 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.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+/*
+
+ * i2c_adapter is the structure used to identify a physical i2c bus along
+ * with the access algorithms necessary to access it.
+
+struct i2c_adapter {
+ struct module *owner;
+ unsigned int id; == is algo->id | hwdep.struct->id, for registered values see below
+ unsigned int class;
+ struct i2c_algorithm *algo; the algorithm to access the bus
+ void *algo_data;
+
+ --- administration stuff.
+ int (*client_register)(struct i2c_client *);
+ int (*client_unregister)(struct i2c_client *);
+
+ data fields that are valid for all devices
+ struct semaphore bus_lock;
+ struct semaphore clist_lock;
+
+ int timeout;
+ int retries;
+ struct device dev; the adapter device
+ struct class_device class_dev; the class device
+
+#ifdef CONFIG_PROC_FS
+ No need to set this when you initialize the adapter
+ int inode;
+#endif def CONFIG_PROC_FS
+
+ int nr;
+ struct list_head clients;
+ struct list_head list;
+ char name[I2C_NAME_SIZE];
+ struct completion dev_released;
+ struct completion class_dev_released;
+};
+*/
+
+
+/*========== Driver for the X1205 on the Linksys NSLU2 ==================*/
+
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/miscdevice.h>
+#include <linux/device.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/moduleparam.h>
+
+#define RTC_GETDATETIME 0
+#define RTC_SETTIME 1
+#define RTC_SETDATETIME 2
+
+#define I2C_M_WR 0 // just for consistancy
+
+// offsets into read buf - add 2 for write buf
+#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_I2C_BUS_ADDR 0x6f // hardwired into x1205
+#define X1205_ALM0_BASE 0x00 // Base address of the ALM0
+#define X1205_CCR_BASE 0x30 // Base address of the CCR
+#define X1205_SR_ADDR 0x3f // Status Register
+#define X1205_SR_WEL 0x02 // Write Enable Latch bit
+#define X1205_SR_RWEL 0x04 // Register Write Enable Bit
+#define X1205_MILBIT 0x80 // this bit set in ccr.hour for 24 hr mode
+#define NOERR 0
+#define RTC_NODATE 0
+#define RTC_DATETOO 1
+
+// comment out next line is your x1205 can't do page writes
+//#define X1205PAGEWRITE 1
+#ifdef X1205PAGEWRITE
+#define DRIVERNAME "Xicor x1205 RTC Driver v0.9.3.3"
+#else
+#define DRIVERNAME "Xicor x1205 RTC Dvr v0.9.3.3NPW"
+#endif
+
+#define DEBUG KERN_DEBUG
+
+
+static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm, u8 reg_base);
+static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm, int datetoo, u8 reg_base);
+static int x1205_attach(struct i2c_adapter *adapter);
+static int x1205_detach(struct i2c_client *client);
+static int x1205_validate_tm(struct rtc_time *tm);
+static int x1205_command(struct i2c_client *client, unsigned int cmd, void *arg);
+static int x1205_sync_rtc(void);
+static int x1205_read(struct file *file, char *buf, size_t count, loff_t *ptr);
+static int x1205_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
+static int x1205_read_proc(char *buf, char **start, off_t off, int len, int *eof, void *data);
+
+static struct i2c_driver x1205_driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVERNAME,
+ .id = I2C_DRIVERID_X1205,
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = &x1205_attach, //we don't need to probe...x1205 is hardwired @ 0x6f
+ .detach_client = &x1205_detach,
+ .command = &x1205_command, //this prolly never gets called...used internally tho
+};
+
+static struct i2c_client x1205_i2c_client = {
+ .id = I2C_DRIVERID_X1205,
+ .flags = 0,
+ .addr = X1205_I2C_BUS_ADDR, // chip address - NOTE: 7bit
+ .adapter = NULL, // the adapter we sit on assigned in attach
+ .driver = &x1205_driver, // and our access routines
+ .usage_count = 0, // How many accesses currently to this client
+ .dev = {}, // the device structure
+ .list = {},
+ .name = DRIVERNAME,
+ .released = {},
+};
+
+static struct file_operations rtc_fops = {
+ owner: THIS_MODULE,
+ ioctl: x1205_ioctl,
+ read: x1205_read,
+};
+
+static struct miscdevice x1205_miscdev = {
+ .minor = RTC_MINOR,
+ .name = "rtc",
+ .fops = &rtc_fops,
+};
+extern int (*set_rtc)(void);
+static unsigned epoch = 1900; //coresponds to year 0
+static unsigned rtc_epoch = 2000;
+static const unsigned char days_in_mo[] =
+{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+//===================================CODE======================================
+// 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 inited as 2000. Time is set to UT
+//=============================================================================
+static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm, u8 reg_base)
+{
+ static unsigned char addr[2] = { 0,} ;
+ unsigned char buf[8];
+ struct i2c_msg msgs[2] = {
+ { client->addr, I2C_M_WR, 2, addr }, //msg 1 = send base address
+ { client->addr, I2C_M_RD, 8, buf }, //msg 2 = read sequential data
+ };
+ addr[1] = reg_base;
+ if ((i2c_transfer(client->adapter, msgs, 2)) == 2) { //did we read 2 messages?
+ printk(KERN_DEBUG "raw x1205 read data - sec-%02x min-%02x hr-%02x mday-%02x mon-%02x year-%02x wday-%02x y2k-%02x\n",
+ 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]);
+ buf[CCR_HOUR] &= ~X1205_MILBIT;
+ tm->tm_hour = BCD2BIN(buf[CCR_HOUR]); //hr is 0-23
+ tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
+ tm->tm_mon = BCD2BIN(buf[CCR_MONTH]);
+ rtc_epoch = BCD2BIN(buf[CCR_Y2K]) * 100;
+ tm->tm_year = BCD2BIN(buf[CCR_YEAR]) + rtc_epoch - epoch;
+ tm->tm_wday = buf[CCR_WDAY];
+ printk(KERN_DEBUG "rtc_time output data - sec-%02d min-%02d hr-%02d mday-%02d mon-%02d year-%02d wday-%02d epoch-%d rtc_epoch-%d\n",
+ tm->tm_sec,tm->tm_min,tm->tm_hour,tm->tm_mday,tm->tm_mon,tm->tm_year,tm->tm_wday,epoch, rtc_epoch);
+ } else {
+ printk(KERN_DEBUG "i2c_transfer Read Error\n");
+ return -EIO;
+ }
+
+ return NOERR;
+}
+// x1205pagewrite allows writing a block of registers in msg3 even though the x1205 says
+// nothing about this in its spec.
+// it needs more testing as it is possible some x1205s are actually not-completely-
+// functional x1226s and there is a reason for the multiple write to not be in the spec.
+// anyhow, it is enabled for the time being...and we even push out luck by sending 10 bytes
+
+static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm, int datetoo, u8 reg_base)
+{
+ static unsigned char wel[3] = { 0, X1205_SR_ADDR, X1205_SR_WEL };
+ static unsigned char rwel[3] = { 0, X1205_SR_ADDR, X1205_SR_WEL | X1205_SR_RWEL };
+ static unsigned char diswe[3] = { 0, X1205_SR_ADDR, 0 };
+
+#ifdef X1205PAGEWRITE
+
+ static unsigned char buf[10] = { 0, X1205_CCR_BASE, };
+ struct i2c_msg msgs[4] = {
+ { client->addr, I2C_M_WR, 3, wel }, //msg 1 = write WEL to to ccr sr
+ { client->addr, I2C_M_WR, 3, rwel }, //msg 2 = write RWEL to ccr sr
+ { client->addr, I2C_M_WR, 10, buf }, //msg 3 = write ccr base addr +seq data
+ { client->addr, I2C_M_WR, 3, diswe }, //msg 4 = 0 to ccr sr to disable writes
+ };
+
+ msgs[2].len = 5; // 5 bytes + addr to set time only
+ buf [1] = reg_base;
+ buf[CCR_SEC+2] = BIN2BCD(tm->tm_sec);
+ buf[CCR_MIN+2] = BIN2BCD(tm->tm_min);
+ buf[CCR_HOUR+2] = BIN2BCD(tm->tm_hour) | X1205_MILBIT; // set 24 hour format
+ if (datetoo == 1) {
+ buf[CCR_MDAY+2] = BIN2BCD(tm->tm_mday);
+ buf[CCR_MONTH+2] = BIN2BCD(tm->tm_mon); // input is 0-11
+ buf[CCR_YEAR+2] = BIN2BCD((tm->tm_year + epoch - rtc_epoch)); // input is yrs since 1900
+ buf[CCR_WDAY+2] = tm->tm_wday & 7;
+ buf[CCR_Y2K+2] = BIN2BCD((rtc_epoch/100));
+ msgs[2].len += 5; //5 more bytes to set date
+ }
+ printk(KERN_DEBUG "rtc_time input - sec-%02d min-%02d hour-%02d mday-%02d mon-%02d year-%02d wday-%02d epoch-%d rtc_epoch-%d\n",
+ tm->tm_sec,tm->tm_min,tm->tm_hour,tm->tm_mday,tm->tm_mon,tm->tm_year,tm->tm_wday, epoch, rtc_epoch);
+ printk(KERN_DEBUG "BCD write data - sec-%02x min-%02x hour-%02x mday-%02x mon-%02x year-%02x wday-%02x y2k-%02x\n",
+ buf[2],buf[3],buf[4],buf[5],buf[6], buf[7], buf[8], buf[9]);
+
+ if ((i2c_transfer(client->adapter, msgs, 4)) != 4)
+ return -EIO;
+ return NOERR;
+
+#else //do this if page writes aren't working
+
+ int i,xfer;
+ static unsigned char data[3] = { 0,};
+ static unsigned char buf[8];
+
+ buf[CCR_SEC] = BIN2BCD(tm->tm_sec);
+ buf[CCR_MIN] = BIN2BCD(tm->tm_min);
+ buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_MILBIT; // set 24 hour format
+ if (datetoo == 1) {
+ buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
+ buf[CCR_MONTH] = BIN2BCD(tm->tm_mon); // input is 0-11
+ buf[CCR_YEAR] = BIN2BCD((tm->tm_year + epoch - rtc_epoch)); // input is yrs since 1900
+ buf[CCR_WDAY] = tm->tm_wday & 7;
+ buf[CCR_Y2K] = BIN2BCD((rtc_epoch/100));
+ }
+ printk(KERN_DEBUG "rtc_time input - sec-%02d min-%02d hour-%02d mday-%02d mon-%02d year-%02d wday-%02d epoch-%d rtc_epoch-%d\n",
+ tm->tm_sec,tm->tm_min,tm->tm_hour,tm->tm_mday,tm->tm_mon,tm->tm_year,tm->tm_wday, epoch, rtc_epoch);
+
+ xfer = i2c_master_send(client, wel, 3);
+ printk(KERN_DEBUG "wen - %x\n", xfer);
+ if (xfer != 3)
+ return -EIO;
+
+ xfer = i2c_master_send(client, rwel, 3);
+ printk(KERN_DEBUG "wenb - %x\n", xfer);
+ if (xfer != 3)
+ return -EIO;
+
+ for (i = 0; i < 8; i++) {
+ data[1] = i + reg_base;
+ data[2] = buf[i];
+ xfer = i2c_master_send(client, data, 3);
+ printk(KERN_DEBUG "xfer - %d addr - %02x data - %02x\n", xfer, data[1], data[2]);
+ if (xfer != 3)
+ return -EIO;
+ };
+
+ xfer = i2c_master_send(client, diswe, 3);
+ printk(KERN_DEBUG "wdis - %x\n", xfer);
+ if (xfer != 3)
+ return -EIO;
+ return NOERR;
+#endif
+}
+//=============================================================================
+
+static int x1205_attach(struct i2c_adapter *adapter)
+{
+ struct rtc_time tm;
+ struct timespec tv;
+ int errno;
+
+ x1205_i2c_client.adapter = adapter;
+ x1205_i2c_client.id++;
+
+ if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) != NOERR) //test for functional driver
+ return -EIO;
+
+ if ((errno = i2c_attach_client(&x1205_i2c_client)) != NOERR)
+ return errno;
+
+ tv.tv_nsec = tm.tm_sec * 10000000;
+ /* WARNING: this is not the C library 'mktime' call, it is a built in
+ * inline function from include/linux/time.h. It expects (requires)
+ * the month to be in the range 1-12
+ */
+ tv.tv_sec = mktime(tm.tm_year+epoch, tm.tm_mon+1, tm.tm_mday, tm.tm_hour,
+ tm.tm_min, tm.tm_sec);
+ do_settimeofday(&tv);
+ set_rtc = x1205_sync_rtc;
+
+ printk(KERN_DEBUG "%s attached on adapter %s\n",x1205_i2c_client.name,
+ x1205_i2c_client.adapter->name); //why is this name a null string?
+
+ return NOERR;
+}
+
+static int x1205_detach(struct i2c_client *client)
+{
+ int errno;
+
+ if ((errno = i2c_detach_client(client)) != 0) {
+ printk(KERN_DEBUG "i2c_detach failed - errno = %d\n", errno);
+ return errno;
+ }
+
+ return NOERR;
+}
+
+// make sure the rtc_time values are in bounds
+static int x1205_validate_tm(struct rtc_time *tm)
+{
+ tm->tm_year += 1900;
+
+ if (tm->tm_year < 1970)
+ return -EINVAL;
+
+ if ((tm->tm_mon > 11) || tm->tm_mon < 0 || (tm->tm_mday == 0))
+ return -EINVAL;
+
+ if (tm->tm_mday > (days_in_mo[tm->tm_mon] + ( (tm->tm_mon == 1) &&
+ ((!(tm->tm_year % 4) && (tm->tm_year % 100) ) || !(tm->tm_year % 400)))))
+ return -EINVAL;
+
+ if ((tm->tm_year -= epoch) > 255)
+ return -EINVAL;
+
+ if ((tm->tm_hour >= 24) || (tm->tm_min >= 60) || (tm->tm_sec >= 60))
+ return -EINVAL;
+ return NOERR;
+}
+
+static int x1205_command(struct i2c_client *client, unsigned int cmd, void *tm)
+{
+ int errno, dodate = RTC_DATETOO;
+
+ if (client == NULL || tm == NULL)
+ return -EINVAL;
+ if (!capable(CAP_SYS_TIME))
+ return -EACCES;
+
+ printk(KERN_DEBUG "x1205_command %d\n", cmd);
+
+ switch (cmd) {
+ case RTC_GETDATETIME:
+ return x1205_get_datetime(client, tm, X1205_CCR_BASE);
+
+ case RTC_SETTIME: // note fall thru
+ dodate = RTC_NODATE;
+ case RTC_SETDATETIME:
+ if ((errno = x1205_validate_tm(tm)) < NOERR)
+ return errno;
+ return x1205_set_datetime(client, tm, dodate, X1205_CCR_BASE);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int x1205_sync_rtc(void)
+{
+ struct rtc_time new_tm, old_tm;
+ unsigned long cur_secs = xtime.tv_sec;
+
+ printk(KERN_DEBUG "x1205_sync_rtc entry\n");
+
+ if (x1205_command(&x1205_i2c_client, RTC_GETDATETIME, &old_tm))
+ return 0;
+
+// xtime.tv_nsec = old_tm.tm_sec * 10000000; //FIXME:
+ new_tm.tm_sec = cur_secs % 60;
+ cur_secs /= 60;
+ new_tm.tm_min = cur_secs % 60;
+ cur_secs /= 60;
+ new_tm.tm_hour = cur_secs % 24;
+
+ /*
+ * avoid writing when we're going to change the day
+ * of the month. We will retry in the next minute.
+ * This basically means that if the RTC must not drift
+ * by more than 1 minute in 11 minutes.
+ */
+ if ((old_tm.tm_hour == 23 && old_tm.tm_min == 59) ||
+ (new_tm.tm_hour == 23 && new_tm.tm_min == 59))
+ return 1;
+ printk(KERN_DEBUG "x1205_sync_rtc exit\n");
+
+ return x1205_command(&x1205_i2c_client, RTC_SETTIME, &new_tm);
+}
+
+static int x1205_read(struct file *file, char *buf, size_t count, loff_t *ptr)
+{
+ struct rtc_time tm;
+
+ if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) < NOERR)
+ return -EIO;
+ return copy_to_user(buf, &tm, sizeof(tm)) ? -EFAULT : NOERR;
+}
+
+//==============================================================================
+
+static int x1205_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct rtc_time tm;
+ int errno;
+
+ printk(KERN_DEBUG "ioctl = %x\n", cmd);
+
+ switch (cmd) {
+ case RTC_RD_TIME:
+ if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) < NOERR)
+ return -EIO;
+ break;
+
+ case RTC_SET_TIME:
+ if (!capable(CAP_SYS_TIME))
+ return -EACCES;
+
+ if (copy_from_user(&tm, (struct rtc_time *) arg, sizeof(struct rtc_time)))
+ return -EFAULT;
+ if ((errno = x1205_validate_tm(&tm)) < NOERR)
+ return errno;
+ return x1205_set_datetime(&x1205_i2c_client, &tm, RTC_DATETOO, X1205_CCR_BASE);
+
+ case RTC_ALM_SET: //FIXME: set Control Regs
+ if (copy_from_user(&tm, (struct rtc_time *) arg, sizeof(struct rtc_time)))
+ return -EFAULT;
+ return x1205_set_datetime(&x1205_i2c_client, &tm, RTC_DATETOO, X1205_ALM0_BASE);
+
+ case RTC_ALM_READ:
+ if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_ALM0_BASE)) < NOERR)
+ return -EIO;
+ break;
+
+ case RTC_EPOCH_READ:
+
+ return put_user (epoch, (unsigned long __user *)arg);
+
+ case RTC_EPOCH_SET:
+ 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, &tm, sizeof tm) ? -EFAULT : 0;
+
+}
+
+static int x1205_read_proc(char *buf, char **start, off_t off, int len, int *eof, void *data)
+{
+ struct rtc_time tm;
+ int slen, errno;
+
+ if ((errno = x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) < NOERR)
+ return errno;
+
+// here we return the real year and the month as 1-12 since it is human-readable
+ slen = sprintf(buf, "rtc_time\t: %02d:%02d:%02d\nrtc_date\t: %04d-%02d-%02d\n",
+ tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year + 1900, tm.tm_mon+1, tm.tm_mday);
+ printk(KERN_DEBUG "raw rtc_time\t: %02d:%02d:%02d\nraw rtc_date\t: %04d-%02d-%02d\n",
+ tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year, tm.tm_mon, tm.tm_mday);
+
+ if (slen <= off + len)
+ *eof = 1;
+ *start = buf + off;
+ slen -= off;
+ if (slen > len)
+ slen = len;
+ if ( slen < 0 )
+ slen = 0;
+
+ return slen;
+}
+
+static int __init x1205_init(void)
+{
+ struct rtc_time tm;
+ int errno;
+ printk(KERN_INFO "LOADED %s\n", DRIVERNAME);
+
+ if ((errno = i2c_add_driver(&x1205_driver)) != NOERR) {
+ dev_dbg(x1205_i2c_client.dev, "x1205_init failed - errno = %d\n", errno);
+ return (errno);
+ }
+ if ((errno = misc_register(&x1205_miscdev)) != NOERR) {
+ dev_dbg(x1205_i2c_client.dev, "Register Misc Driver failed - errno = %d\n", errno);
+ i2c_del_driver(&x1205_driver);
+ return errno;
+ }
+ if (create_proc_read_entry("driver/rtc", 0, NULL, x1205_read_proc, NULL) < NOERR)
+ return -ENOMEM;
+ if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) != NOERR) //test for functionality
+ return -EIO;
+
+ return NOERR;
+}
+
+static void __exit x1205_exit(void)
+{
+ remove_proc_entry("driver/rtc", NULL);
+ misc_deregister(&x1205_miscdev);
+ i2c_del_driver(&x1205_driver);
+ set_rtc = NULL;
+}
+
+MODULE_AUTHOR("Karen Spearel <kas11@tampabay.rr.com>");
+MODULE_DESCRIPTION("Xicor X1205-RTC Driver");
+MODULE_LICENSE("GPL");
+static int debug = 7;
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Debugging enabled = 1");
+
+module_init(x1205_init);
+module_exit(x1205_exit);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 15:24:15 +0000