* drivers/rtc/rtc-pcf8583.c
*
* Copyright (C) 2000 Russell King
+ * Copyright (C) 2008 Wolfram Sang & Juergen Beisert, Pengutronix
*
* 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
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/mc146818rtc.h>
+#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/bcd.h>
};
struct pcf8583 {
- struct i2c_client client;
struct rtc_device *rtc;
unsigned char ctrl;
};
#define CTRL_ALARM 0x02
#define CTRL_TIMER 0x01
-static unsigned short normal_i2c[] = { I2C_CLIENT_END };
-
-/* Module parameters */
-I2C_CLIENT_INSMOD;
static struct i2c_driver pcf8583_driver;
buf[4] &= 0x3f;
buf[5] &= 0x1f;
- dt->tm_sec = BCD_TO_BIN(buf[1]);
- dt->tm_min = BCD_TO_BIN(buf[2]);
- dt->tm_hour = BCD_TO_BIN(buf[3]);
- dt->tm_mday = BCD_TO_BIN(buf[4]);
- dt->tm_mon = BCD_TO_BIN(buf[5]);
+ dt->tm_sec = BCD2BIN(buf[1]);
+ dt->tm_min = BCD2BIN(buf[2]);
+ dt->tm_hour = BCD2BIN(buf[3]);
+ dt->tm_mday = BCD2BIN(buf[4]);
+ dt->tm_mon = BCD2BIN(buf[5]) - 1;
}
return ret == 2 ? 0 : -EIO;
buf[0] = 0;
buf[1] = get_ctrl(client) | 0x80;
buf[2] = 0;
- buf[3] = BIN_TO_BCD(dt->tm_sec);
- buf[4] = BIN_TO_BCD(dt->tm_min);
- buf[5] = BIN_TO_BCD(dt->tm_hour);
+ buf[3] = BIN2BCD(dt->tm_sec);
+ buf[4] = BIN2BCD(dt->tm_min);
+ buf[5] = BIN2BCD(dt->tm_hour);
if (datetoo) {
len = 8;
- buf[6] = BIN_TO_BCD(dt->tm_mday) | (dt->tm_year << 6);
- buf[7] = BIN_TO_BCD(dt->tm_mon) | (dt->tm_wday << 5);
+ buf[6] = BIN2BCD(dt->tm_mday) | (dt->tm_year << 6);
+ buf[7] = BIN2BCD(dt->tm_mon + 1) | (dt->tm_wday << 5);
}
ret = i2c_master_send(client, (char *)buf, len);
static int pcf8583_write_mem(struct i2c_client *client, struct rtc_mem *mem)
{
- unsigned char addr[1];
- struct i2c_msg msgs[2] = {
- {
- .addr = client->addr,
- .flags = 0,
- .len = 1,
- .buf = addr,
- }, {
- .addr = client->addr,
- .flags = I2C_M_NOSTART,
- .len = mem->nr,
- .buf = mem->data,
- }
- };
+ unsigned char buf[9];
+ int ret;
- if (mem->loc < 8)
+ if (mem->loc < 8 || mem->nr > 8)
return -EINVAL;
- addr[0] = mem->loc;
+ buf[0] = mem->loc;
+ memcpy(buf + 1, mem->data, mem->nr);
- return i2c_transfer(client->adapter, msgs, 2) == 2 ? 0 : -EIO;
+ ret = i2c_master_send(client, buf, mem->nr + 1);
+ return ret == mem->nr + 1 ? 0 : -EIO;
}
static int pcf8583_rtc_read_time(struct device *dev, struct rtc_time *tm)
*/
year_offset += 4;
- tm->tm_year = real_year + year_offset + year[1] * 100;
+ tm->tm_year = (real_year + year_offset + year[1] * 100) - 1900;
return 0;
}
unsigned char year[2], chk;
struct rtc_mem cmos_year = { CMOS_YEAR, sizeof(year), year };
struct rtc_mem cmos_check = { CMOS_CHECKSUM, 1, &chk };
+ unsigned int proper_year = tm->tm_year + 1900;
int ret;
/*
chk -= year[1] + year[0];
- year[1] = tm->tm_year / 100;
- year[0] = tm->tm_year % 100;
+ year[1] = proper_year / 100;
+ year[0] = proper_year % 100;
chk += year[1] + year[0];
return ret;
}
-static struct rtc_class_ops pcf8583_rtc_ops = {
+static const struct rtc_class_ops pcf8583_rtc_ops = {
.read_time = pcf8583_rtc_read_time,
.set_time = pcf8583_rtc_set_time,
};
-static int pcf8583_probe(struct i2c_adapter *adap, int addr, int kind);
-
-static int pcf8583_attach(struct i2c_adapter *adap)
-{
- return i2c_probe(adap, &addr_data, pcf8583_probe);
-}
-
-static int pcf8583_detach(struct i2c_client *client)
+static int pcf8583_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
+ struct pcf8583 *pcf8583;
int err;
- struct pcf8583 *pcf = i2c_get_clientdata(client);
- struct rtc_device *rtc = pcf->rtc;
- if (rtc)
- rtc_device_unregister(rtc);
-
- if ((err = i2c_detach_client(client)))
- return err;
-
- kfree(pcf);
- return 0;
-}
-
-static struct i2c_driver pcf8583_driver = {
- .driver = {
- .name = "pcf8583",
- },
- .id = I2C_DRIVERID_PCF8583,
- .attach_adapter = pcf8583_attach,
- .detach_client = pcf8583_detach,
-};
-
-static int pcf8583_probe(struct i2c_adapter *adap, int addr, int kind)
-{
- struct pcf8583 *pcf;
- struct i2c_client *client;
- struct rtc_device *rtc;
- unsigned char buf[1], ad[1] = { 0 };
- int err;
- struct i2c_msg msgs[2] = {
- {
- .addr = addr,
- .flags = 0,
- .len = 1,
- .buf = ad,
- }, {
- .addr = addr,
- .flags = I2C_M_RD,
- .len = 1,
- .buf = buf,
- }
- };
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -ENODEV;
- pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
- if (!pcf)
+ pcf8583 = kzalloc(sizeof(struct pcf8583), GFP_KERNEL);
+ if (!pcf8583)
return -ENOMEM;
- client = &pcf->client;
-
- client->addr = addr;
- client->adapter = adap;
- client->driver = &pcf8583_driver;
+ pcf8583->rtc = rtc_device_register(pcf8583_driver.driver.name,
+ &client->dev, &pcf8583_rtc_ops, THIS_MODULE);
- strlcpy(client->name, pcf8583_driver.driver.name, I2C_NAME_SIZE);
-
- if (i2c_transfer(client->adapter, msgs, 2) != 2) {
- err = -EIO;
+ if (IS_ERR(pcf8583->rtc)) {
+ err = PTR_ERR(pcf8583->rtc);
goto exit_kfree;
}
- err = i2c_attach_client(client);
-
- if (err)
- goto exit_kfree;
-
- rtc = rtc_device_register(pcf8583_driver.driver.name, &client->dev,
- &pcf8583_rtc_ops, THIS_MODULE);
+ i2c_set_clientdata(client, pcf8583);
+ return 0;
- if (IS_ERR(rtc)) {
- err = PTR_ERR(rtc);
- goto exit_detach;
- }
+exit_kfree:
+ kfree(pcf8583);
+ return err;
+}
- pcf->rtc = rtc;
- i2c_set_clientdata(client, pcf);
- set_ctrl(client, buf[0]);
+static int __devexit pcf8583_remove(struct i2c_client *client)
+{
+ struct pcf8583 *pcf8583 = i2c_get_clientdata(client);
+ if (pcf8583->rtc)
+ rtc_device_unregister(pcf8583->rtc);
+ kfree(pcf8583);
return 0;
+}
-exit_detach:
- i2c_detach_client(client);
-
-exit_kfree:
- kfree(pcf);
+static const struct i2c_device_id pcf8583_id[] = {
+ { "pcf8583", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pcf8583_id);
- return err;
-}
+static struct i2c_driver pcf8583_driver = {
+ .driver = {
+ .name = "pcf8583",
+ .owner = THIS_MODULE,
+ },
+ .probe = pcf8583_probe,
+ .remove = __devexit_p(pcf8583_remove),
+ .id_table = pcf8583_id,
+};
static __init int pcf8583_init(void)
{