291 lines
6.8 KiB
C
291 lines
6.8 KiB
C
/*
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* An I2C driver for the Ricoh RS5C372 RTC
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*
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* Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net>
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* Copyright (C) 2006 Tower Technologies
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/i2c.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#define DRV_VERSION "0.2"
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { /* 0x32,*/ I2C_CLIENT_END };
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/* Insmod parameters */
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I2C_CLIENT_INSMOD;
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#define RS5C372_REG_SECS 0
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#define RS5C372_REG_MINS 1
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#define RS5C372_REG_HOURS 2
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#define RS5C372_REG_WDAY 3
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#define RS5C372_REG_DAY 4
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#define RS5C372_REG_MONTH 5
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#define RS5C372_REG_YEAR 6
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#define RS5C372_REG_TRIM 7
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#define RS5C372_TRIM_XSL 0x80
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#define RS5C372_TRIM_MASK 0x7F
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#define RS5C372_REG_BASE 0
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static int rs5c372_attach(struct i2c_adapter *adapter);
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static int rs5c372_detach(struct i2c_client *client);
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static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind);
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static struct i2c_driver rs5c372_driver = {
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.driver = {
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.name = "rs5c372",
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},
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.attach_adapter = &rs5c372_attach,
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.detach_client = &rs5c372_detach,
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};
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static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm)
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{
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unsigned char buf[7] = { RS5C372_REG_BASE };
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/* this implements the 1st reading method, according
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* to the datasheet. buf[0] is initialized with
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* address ptr and transmission format register.
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*/
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struct i2c_msg msgs[] = {
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{ client->addr, 0, 1, buf },
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{ client->addr, I2C_M_RD, 7, buf },
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};
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if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
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dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
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return -EIO;
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}
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tm->tm_sec = BCD2BIN(buf[RS5C372_REG_SECS] & 0x7f);
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tm->tm_min = BCD2BIN(buf[RS5C372_REG_MINS] & 0x7f);
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tm->tm_hour = BCD2BIN(buf[RS5C372_REG_HOURS] & 0x3f);
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tm->tm_wday = BCD2BIN(buf[RS5C372_REG_WDAY] & 0x07);
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tm->tm_mday = BCD2BIN(buf[RS5C372_REG_DAY] & 0x3f);
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/* tm->tm_mon is zero-based */
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tm->tm_mon = BCD2BIN(buf[RS5C372_REG_MONTH] & 0x1f) - 1;
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/* year is 1900 + tm->tm_year */
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tm->tm_year = BCD2BIN(buf[RS5C372_REG_YEAR]) + 100;
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
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"mday=%d, mon=%d, year=%d, wday=%d\n",
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__FUNCTION__,
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tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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return 0;
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}
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static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
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{
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unsigned char buf[8] = { RS5C372_REG_BASE };
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dev_dbg(&client->dev,
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"%s: secs=%d, mins=%d, hours=%d ",
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"mday=%d, mon=%d, year=%d, wday=%d\n",
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__FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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buf[1] = BIN2BCD(tm->tm_sec);
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buf[2] = BIN2BCD(tm->tm_min);
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buf[3] = BIN2BCD(tm->tm_hour);
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buf[4] = BIN2BCD(tm->tm_wday);
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buf[5] = BIN2BCD(tm->tm_mday);
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buf[6] = BIN2BCD(tm->tm_mon + 1);
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buf[7] = BIN2BCD(tm->tm_year - 100);
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if ((i2c_master_send(client, buf, 8)) != 8) {
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dev_err(&client->dev, "%s: write error\n", __FUNCTION__);
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return -EIO;
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}
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return 0;
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}
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static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
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{
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unsigned char buf = RS5C372_REG_TRIM;
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struct i2c_msg msgs[] = {
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{ client->addr, 0, 1, &buf },
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{ client->addr, I2C_M_RD, 1, &buf },
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};
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if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
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dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
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return -EIO;
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}
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dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, trim);
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if (osc)
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*osc = (buf & RS5C372_TRIM_XSL) ? 32000 : 32768;
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if (trim)
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*trim = buf & RS5C372_TRIM_MASK;
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return 0;
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}
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static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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return rs5c372_get_datetime(to_i2c_client(dev), tm);
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}
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static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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return rs5c372_set_datetime(to_i2c_client(dev), tm);
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}
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static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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int err, osc, trim;
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err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
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if (err == 0) {
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seq_printf(seq, "%d.%03d KHz\n", osc / 1000, osc % 1000);
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seq_printf(seq, "trim\t: %d\n", trim);
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}
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return 0;
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}
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static const struct rtc_class_ops rs5c372_rtc_ops = {
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.proc = rs5c372_rtc_proc,
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.read_time = rs5c372_rtc_read_time,
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.set_time = rs5c372_rtc_set_time,
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};
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static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int err, trim;
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err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
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if (err)
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return err;
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return sprintf(buf, "0x%2x\n", trim);
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}
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static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
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static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int err, osc;
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err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
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if (err)
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return err;
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return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
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}
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static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
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static int rs5c372_attach(struct i2c_adapter *adapter)
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{
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return i2c_probe(adapter, &addr_data, rs5c372_probe);
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}
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static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind)
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{
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int err = 0;
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struct i2c_client *client;
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struct rtc_device *rtc;
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dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
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if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
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err = -ENODEV;
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goto exit;
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}
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if (!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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/* I2C client */
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client->addr = address;
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client->driver = &rs5c372_driver;
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client->adapter = adapter;
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strlcpy(client->name, rs5c372_driver.driver.name, I2C_NAME_SIZE);
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/* Inform the i2c layer */
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if ((err = i2c_attach_client(client)))
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goto exit_kfree;
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dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
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rtc = rtc_device_register(rs5c372_driver.driver.name, &client->dev,
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&rs5c372_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc)) {
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err = PTR_ERR(rtc);
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goto exit_detach;
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}
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i2c_set_clientdata(client, rtc);
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device_create_file(&client->dev, &dev_attr_trim);
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device_create_file(&client->dev, &dev_attr_osc);
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return 0;
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exit_detach:
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i2c_detach_client(client);
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exit_kfree:
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kfree(client);
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exit:
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return err;
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}
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static int rs5c372_detach(struct i2c_client *client)
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{
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int err;
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struct rtc_device *rtc = i2c_get_clientdata(client);
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if (rtc)
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rtc_device_unregister(rtc);
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if ((err = i2c_detach_client(client)))
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return err;
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kfree(client);
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return 0;
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}
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static __init int rs5c372_init(void)
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{
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return i2c_add_driver(&rs5c372_driver);
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}
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static __exit void rs5c372_exit(void)
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{
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i2c_del_driver(&rs5c372_driver);
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}
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module_init(rs5c372_init);
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module_exit(rs5c372_exit);
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MODULE_AUTHOR(
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"Pavel Mironchik <pmironchik@optifacio.net>, "
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"Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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