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rtc: add support for the S-35390A RTC chip
This adds basic get/set time support for the Seiko Instruments S-35390A. This chip communicates using I2C and is used on the QNAP TS-109/TS-209 NAS devices. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Byron Bradley <byron.bbradley@gmail.com> Acked-by: Jean Delvare <khali@linux-fr.org> Acked-by: David Brownell <david-b@pacbell.net> Tested-by: Tim Ellis <tim@ngndg.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Byron Bradley
Linus Torvalds
parent
fb78922ce9
commit
c46288b09e
@ -250,6 +250,15 @@ config RTC_DRV_TWL92330
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platforms. The support is integrated with the rest of
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the Menelaus driver; it's not separate module.
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config RTC_DRV_S35390A
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tristate "Seiko Instruments S-35390A"
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help
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If you say yes here you will get support for the Seiko
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Instruments S-35390A.
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This driver can also be built as a module. If so the module
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will be called rtc-s35390a.
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endif # I2C
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comment "SPI RTC drivers"
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@ -45,6 +45,7 @@ obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
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obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
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obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
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obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
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obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o
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obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o
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obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
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obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o
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316
drivers/rtc/rtc-s35390a.c
Normal file
316
drivers/rtc/rtc-s35390a.c
Normal file
@ -0,0 +1,316 @@
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/*
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* Seiko Instruments S-35390A RTC Driver
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*
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* Copyright (c) 2007 Byron Bradley
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/i2c.h>
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#include <linux/bitrev.h>
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#include <linux/bcd.h>
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#include <linux/slab.h>
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#define S35390A_CMD_STATUS1 0
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#define S35390A_CMD_STATUS2 1
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#define S35390A_CMD_TIME1 2
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#define S35390A_BYTE_YEAR 0
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#define S35390A_BYTE_MONTH 1
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#define S35390A_BYTE_DAY 2
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#define S35390A_BYTE_WDAY 3
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#define S35390A_BYTE_HOURS 4
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#define S35390A_BYTE_MINS 5
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#define S35390A_BYTE_SECS 6
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#define S35390A_FLAG_POC 0x01
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#define S35390A_FLAG_BLD 0x02
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#define S35390A_FLAG_24H 0x40
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#define S35390A_FLAG_RESET 0x80
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#define S35390A_FLAG_TEST 0x01
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struct s35390a {
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struct i2c_client *client[8];
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struct rtc_device *rtc;
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int twentyfourhour;
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};
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static int s35390a_set_reg(struct s35390a *s35390a, int reg, char *buf, int len)
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{
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struct i2c_client *client = s35390a->client[reg];
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struct i2c_msg msg[] = {
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{ client->addr, 0, len, buf },
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};
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if ((i2c_transfer(client->adapter, msg, 1)) != 1)
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return -EIO;
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return 0;
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}
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static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)
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{
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struct i2c_client *client = s35390a->client[reg];
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struct i2c_msg msg[] = {
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{ client->addr, I2C_M_RD, len, buf },
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};
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if ((i2c_transfer(client->adapter, msg, 1)) != 1)
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return -EIO;
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return 0;
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}
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static int s35390a_reset(struct s35390a *s35390a)
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{
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char buf[1];
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if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf)) < 0)
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return -EIO;
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if (!(buf[0] & (S35390A_FLAG_POC | S35390A_FLAG_BLD)))
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return 0;
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buf[0] |= (S35390A_FLAG_RESET | S35390A_FLAG_24H);
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buf[0] &= 0xf0;
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return s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
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}
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static int s35390a_disable_test_mode(struct s35390a *s35390a)
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{
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char buf[1];
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if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf)) < 0)
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return -EIO;
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if (!(buf[0] & S35390A_FLAG_TEST))
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return 0;
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buf[0] &= ~S35390A_FLAG_TEST;
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return s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf));
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}
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static char s35390a_hr2reg(struct s35390a *s35390a, int hour)
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{
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if (s35390a->twentyfourhour)
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return BIN2BCD(hour);
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if (hour < 12)
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return BIN2BCD(hour);
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return 0x40 | BIN2BCD(hour - 12);
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}
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static int s35390a_reg2hr(struct s35390a *s35390a, char reg)
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{
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unsigned hour;
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if (s35390a->twentyfourhour)
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return BCD2BIN(reg & 0x3f);
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hour = BCD2BIN(reg & 0x3f);
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if (reg & 0x40)
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hour += 12;
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return hour;
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}
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static int s35390a_set_datetime(struct i2c_client *client, struct rtc_time *tm)
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{
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struct s35390a *s35390a = i2c_get_clientdata(client);
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int i, err;
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char buf[7];
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d mday=%d, "
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"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
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tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
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tm->tm_wday);
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buf[S35390A_BYTE_YEAR] = BIN2BCD(tm->tm_year - 100);
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buf[S35390A_BYTE_MONTH] = BIN2BCD(tm->tm_mon + 1);
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buf[S35390A_BYTE_DAY] = BIN2BCD(tm->tm_mday);
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buf[S35390A_BYTE_WDAY] = BIN2BCD(tm->tm_wday);
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buf[S35390A_BYTE_HOURS] = s35390a_hr2reg(s35390a, tm->tm_hour);
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buf[S35390A_BYTE_MINS] = BIN2BCD(tm->tm_min);
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buf[S35390A_BYTE_SECS] = BIN2BCD(tm->tm_sec);
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/* This chip expects the bits of each byte to be in reverse order */
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for (i = 0; i < 7; ++i)
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buf[i] = bitrev8(buf[i]);
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err = s35390a_set_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
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return err;
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}
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static int s35390a_get_datetime(struct i2c_client *client, struct rtc_time *tm)
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{
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struct s35390a *s35390a = i2c_get_clientdata(client);
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char buf[7];
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int i, err;
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err = s35390a_get_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
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if (err < 0)
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return err;
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/* This chip returns the bits of each byte in reverse order */
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for (i = 0; i < 7; ++i)
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buf[i] = bitrev8(buf[i]);
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tm->tm_sec = BCD2BIN(buf[S35390A_BYTE_SECS]);
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tm->tm_min = BCD2BIN(buf[S35390A_BYTE_MINS]);
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tm->tm_hour = s35390a_reg2hr(s35390a, buf[S35390A_BYTE_HOURS]);
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tm->tm_wday = BCD2BIN(buf[S35390A_BYTE_WDAY]);
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tm->tm_mday = BCD2BIN(buf[S35390A_BYTE_DAY]);
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tm->tm_mon = BCD2BIN(buf[S35390A_BYTE_MONTH]) - 1;
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tm->tm_year = BCD2BIN(buf[S35390A_BYTE_YEAR]) + 100;
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, mday=%d, "
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"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
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tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
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tm->tm_wday);
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return rtc_valid_tm(tm);
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}
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static int s35390a_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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return s35390a_get_datetime(to_i2c_client(dev), tm);
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}
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static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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return s35390a_set_datetime(to_i2c_client(dev), tm);
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}
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static const struct rtc_class_ops s35390a_rtc_ops = {
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.read_time = s35390a_rtc_read_time,
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.set_time = s35390a_rtc_set_time,
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};
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static struct i2c_driver s35390a_driver;
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static int s35390a_probe(struct i2c_client *client)
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{
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int err;
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unsigned int i;
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struct s35390a *s35390a;
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struct rtc_time tm;
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char buf[1];
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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err = -ENODEV;
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goto exit;
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}
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s35390a = kzalloc(sizeof(struct s35390a), GFP_KERNEL);
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if (!s35390a) {
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err = -ENOMEM;
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goto exit;
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}
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s35390a->client[0] = client;
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i2c_set_clientdata(client, s35390a);
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/* This chip uses multiple addresses, use dummy devices for them */
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for (i = 1; i < 8; ++i) {
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s35390a->client[i] = i2c_new_dummy(client->adapter,
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client->addr + i, "rtc-s35390a");
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if (!s35390a->client[i]) {
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dev_err(&client->dev, "Address %02x unavailable\n",
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client->addr + i);
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err = -EBUSY;
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goto exit_dummy;
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}
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}
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err = s35390a_reset(s35390a);
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if (err < 0) {
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dev_err(&client->dev, "error resetting chip\n");
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goto exit_dummy;
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}
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err = s35390a_disable_test_mode(s35390a);
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if (err < 0) {
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dev_err(&client->dev, "error disabling test mode\n");
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goto exit_dummy;
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}
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err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
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if (err < 0) {
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dev_err(&client->dev, "error checking 12/24 hour mode\n");
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goto exit_dummy;
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}
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if (buf[0] & S35390A_FLAG_24H)
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s35390a->twentyfourhour = 1;
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else
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s35390a->twentyfourhour = 0;
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if (s35390a_get_datetime(client, &tm) < 0)
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dev_warn(&client->dev, "clock needs to be set\n");
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s35390a->rtc = rtc_device_register(s35390a_driver.driver.name,
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&client->dev, &s35390a_rtc_ops, THIS_MODULE);
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if (IS_ERR(s35390a->rtc)) {
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err = PTR_ERR(s35390a->rtc);
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goto exit_dummy;
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}
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return 0;
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exit_dummy:
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for (i = 1; i < 8; ++i)
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if (s35390a->client[i])
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i2c_unregister_device(s35390a->client[i]);
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kfree(s35390a);
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i2c_set_clientdata(client, NULL);
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exit:
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return err;
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}
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static int s35390a_remove(struct i2c_client *client)
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{
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unsigned int i;
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struct s35390a *s35390a = i2c_get_clientdata(client);
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for (i = 1; i < 8; ++i)
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if (s35390a->client[i])
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i2c_unregister_device(s35390a->client[i]);
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rtc_device_unregister(s35390a->rtc);
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kfree(s35390a);
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i2c_set_clientdata(client, NULL);
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return 0;
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}
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static struct i2c_driver s35390a_driver = {
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.driver = {
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.name = "rtc-s35390a",
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},
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.probe = s35390a_probe,
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.remove = s35390a_remove,
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};
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static int __init s35390a_rtc_init(void)
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{
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return i2c_add_driver(&s35390a_driver);
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}
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static void __exit s35390a_rtc_exit(void)
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{
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i2c_del_driver(&s35390a_driver);
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}
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MODULE_AUTHOR("Byron Bradley <byron.bbradley@gmail.com>");
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MODULE_DESCRIPTION("S35390A RTC driver");
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MODULE_LICENSE("GPL");
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module_init(s35390a_rtc_init);
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module_exit(s35390a_rtc_exit);
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