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rtc: merge ds3232 and ds3234

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According to "Feature Comparison of the DS323x Real-Time Clocks"
(http://pdfserv.maximintegrated.com/en/an/AN5143.pdf), DS3232 and
DS3234 are very similar.

This merges rtc-ds3232 and rtc-ds3234 with using regmap.
This change also enables to support alarm for ds3234.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Suggested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Akinobu Mita 2016-03-07 00:27:48 +09:00 committed by Alexandre Belloni
parent 370927c4b6
commit 080481f54e
4 changed files with 189 additions and 194 deletions
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44
drivers/rtc/Kconfig
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@ -247,16 +247,6 @@ config RTC_DRV_DS1672
This driver can also be built as a module. If so, the module This driver can also be built as a module. If so, the module
will be called rtc-ds1672. will be called rtc-ds1672.
config RTC_DRV_DS3232
tristate "Dallas/Maxim DS3232"
help
If you say yes here you get support for Dallas Semiconductor
DS3232 real-time clock chips. If an interrupt is associated
with the device, the alarm functionality is supported.
This driver can also be built as a module. If so, the module
will be called rtc-ds3232.
config RTC_DRV_HYM8563 config RTC_DRV_HYM8563
tristate "Haoyu Microelectronics HYM8563" tristate "Haoyu Microelectronics HYM8563"
depends on OF depends on OF
@ -733,15 +723,6 @@ config RTC_DRV_MAX6902
This driver can also be built as a module. If so, the module This driver can also be built as a module. If so, the module
will be called rtc-max6902. will be called rtc-max6902.
config RTC_DRV_DS3234
tristate "Maxim/Dallas DS3234"
help
If you say yes here you get support for the
Maxim/Dallas DS3234 SPI RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-ds3234.
config RTC_DRV_PCF2123 config RTC_DRV_PCF2123
tristate "NXP PCF2123" tristate "NXP PCF2123"
help help
@ -761,6 +742,31 @@ config RTC_DRV_MCP795
endif # SPI_MASTER endif # SPI_MASTER
#
# Helper to resolve issues with configs that have SPI enabled but I2C
# modular. See SND_SOC_I2C_AND_SPI for more information
#
config RTC_I2C_AND_SPI
tristate
default m if I2C=m
default y if I2C=y
default y if SPI_MASTER=y
select REGMAP_I2C if I2C
select REGMAP_SPI if SPI_MASTER
comment "SPI and I2C RTC drivers"
config RTC_DRV_DS3232
tristate "Dallas/Maxim DS3232/DS3234"
depends on RTC_I2C_AND_SPI
help
If you say yes here you get support for Dallas Semiconductor
DS3232 and DS3234 real-time clock chips. If an interrupt is associated
with the device, the alarm functionality is supported.
This driver can also be built as a module. If so, the module
will be called rtc-ds3232.
comment "Platform RTC drivers" comment "Platform RTC drivers"
# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h> # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>

1
drivers/rtc/Makefile
View File

@ -60,7 +60,6 @@ obj-$(CONFIG_RTC_DRV_DS1685_FAMILY) += rtc-ds1685.o
obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
obj-$(CONFIG_RTC_DRV_DS2404) += rtc-ds2404.o obj-$(CONFIG_RTC_DRV_DS2404) += rtc-ds2404.o
obj-$(CONFIG_RTC_DRV_DS3232) += rtc-ds3232.o obj-$(CONFIG_RTC_DRV_DS3232) += rtc-ds3232.o
obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o
obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o
obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o
obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o

167
drivers/rtc/rtc-ds3232.c
View File

@ -1,8 +1,9 @@
/* /*
* RTC client/driver for the Maxim/Dallas DS3232 Real-Time Clock over I2C * RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock
* *
* Copyright (C) 2009-2011 Freescale Semiconductor. * Copyright (C) 2009-2011 Freescale Semiconductor.
* Author: Jack Lan <jack.lan@freescale.com> * Author: Jack Lan <jack.lan@freescale.com>
* Copyright (C) 2008 MIMOMax Wireless Ltd.
* *
* This program is free software; you can redistribute it and/or modify it * 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 * under the terms of the GNU General Public License as published by the
@ -16,6 +17,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/rtc.h> #include <linux/rtc.h>
#include <linux/bcd.h> #include <linux/bcd.h>
#include <linux/workqueue.h> #include <linux/workqueue.h>
@ -481,6 +483,8 @@ static const struct dev_pm_ops ds3232_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume) SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume)
}; };
#if IS_ENABLED(CONFIG_I2C)
static int ds3232_i2c_probe(struct i2c_client *client, static int ds3232_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id) const struct i2c_device_id *id)
{ {
@ -520,8 +524,165 @@ static struct i2c_driver ds3232_driver = {
.remove = ds3232_i2c_remove, .remove = ds3232_i2c_remove,
.id_table = ds3232_id, .id_table = ds3232_id,
}; };
module_i2c_driver(ds3232_driver);
static int ds3232_register_driver(void)
{
return i2c_add_driver(&ds3232_driver);
}
static void ds3232_unregister_driver(void)
{
i2c_del_driver(&ds3232_driver);
}
#else
static int ds3232_register_driver(void)
{
return 0;
}
static void ds3232_unregister_driver(void)
{
}
#endif
#if IS_ENABLED(CONFIG_SPI_MASTER)
static int ds3234_probe(struct spi_device *spi)
{
int res;
unsigned int tmp;
static const struct regmap_config config = {
.reg_bits = 8,
.val_bits = 8,
.write_flag_mask = 0x80,
};
struct regmap *regmap;
regmap = devm_regmap_init_spi(spi, &config);
if (IS_ERR(regmap)) {
dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(regmap));
return PTR_ERR(regmap);
}
spi->mode = SPI_MODE_3;
spi->bits_per_word = 8;
spi_setup(spi);
res = regmap_read(regmap, DS3232_REG_SECONDS, &tmp);
if (res)
return res;
/* Control settings
*
* CONTROL_REG
* BIT 7 6 5 4 3 2 1 0
* EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE
*
* 0 0 0 1 1 1 0 0
*
* CONTROL_STAT_REG
* BIT 7 6 5 4 3 2 1 0
* OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F
*
* 1 0 0 0 1 0 0 0
*/
res = regmap_read(regmap, DS3232_REG_CR, &tmp);
if (res)
return res;
res = regmap_write(regmap, DS3232_REG_CR, tmp & 0x1c);
if (res)
return res;
res = regmap_read(regmap, DS3232_REG_SR, &tmp);
if (res)
return res;
res = regmap_write(regmap, DS3232_REG_SR, tmp & 0x88);
if (res)
return res;
/* Print our settings */
res = regmap_read(regmap, DS3232_REG_CR, &tmp);
if (res)
return res;
dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp);
res = regmap_read(regmap, DS3232_REG_SR, &tmp);
if (res)
return res;
dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp);
return ds3232_probe(&spi->dev, regmap, spi->irq, "ds3234");
}
static int ds3234_remove(struct spi_device *spi)
{
return ds3232_remove(&spi->dev);
}
static struct spi_driver ds3234_driver = {
.driver = {
.name = "ds3234",
},
.probe = ds3234_probe,
.remove = ds3234_remove,
};
static int ds3234_register_driver(void)
{
return spi_register_driver(&ds3234_driver);
}
static void ds3234_unregister_driver(void)
{
spi_unregister_driver(&ds3234_driver);
}
#else
static int ds3234_register_driver(void)
{
return 0;
}
static void ds3234_unregister_driver(void)
{
}
#endif
static int __init ds323x_init(void)
{
int ret;
ret = ds3232_register_driver();
if (ret) {
pr_err("Failed to register ds3232 driver: %d\n", ret);
return ret;
}
ret = ds3234_register_driver();
if (ret) {
pr_err("Failed to register ds3234 driver: %d\n", ret);
ds3232_unregister_driver();
}
return ret;
}
module_init(ds323x_init)
static void __exit ds323x_exit(void)
{
ds3234_unregister_driver();
ds3232_unregister_driver();
}
module_exit(ds323x_exit)
MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>"); MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
MODULE_DESCRIPTION("Maxim/Dallas DS3232 RTC Driver"); MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>");
MODULE_DESCRIPTION("Maxim/Dallas DS3232/DS3234 RTC Driver");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ds3234");

171
drivers/rtc/rtc-ds3234.c
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@ -1,171 +0,0 @@
/* rtc-ds3234.c
*
* Driver for Dallas Semiconductor (DS3234) SPI RTC with Integrated Crystal
* and SRAM.
*
* Copyright (C) 2008 MIMOMax Wireless Ltd.
*
* 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/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/spi/spi.h>
#include <linux/bcd.h>
#define DS3234_REG_SECONDS 0x00
#define DS3234_REG_MINUTES 0x01
#define DS3234_REG_HOURS 0x02
#define DS3234_REG_DAY 0x03
#define DS3234_REG_DATE 0x04
#define DS3234_REG_MONTH 0x05
#define DS3234_REG_YEAR 0x06
#define DS3234_REG_CENTURY (1 << 7) /* Bit 7 of the Month register */
#define DS3234_REG_CONTROL 0x0E
#define DS3234_REG_CONT_STAT 0x0F
static int ds3234_set_reg(struct device *dev, unsigned char address,
unsigned char data)
{
struct spi_device *spi = to_spi_device(dev);
unsigned char buf[2];
/* MSB must be '1' to indicate write */
buf[0] = address | 0x80;
buf[1] = data;
return spi_write_then_read(spi, buf, 2, NULL, 0);
}
static int ds3234_get_reg(struct device *dev, unsigned char address,
unsigned char *data)
{
struct spi_device *spi = to_spi_device(dev);
*data = address & 0x7f;
return spi_write_then_read(spi, data, 1, data, 1);
}
static int ds3234_read_time(struct device *dev, struct rtc_time *dt)
{
int err;
unsigned char buf[8];
struct spi_device *spi = to_spi_device(dev);
buf[0] = 0x00; /* Start address */
err = spi_write_then_read(spi, buf, 1, buf, 8);
if (err != 0)
return err;
/* Seconds, Minutes, Hours, Day, Date, Month, Year */
dt->tm_sec = bcd2bin(buf[0]);
dt->tm_min = bcd2bin(buf[1]);
dt->tm_hour = bcd2bin(buf[2] & 0x3f);
dt->tm_wday = bcd2bin(buf[3]) - 1; /* 0 = Sun */
dt->tm_mday = bcd2bin(buf[4]);
dt->tm_mon = bcd2bin(buf[5] & 0x1f) - 1; /* 0 = Jan */
dt->tm_year = bcd2bin(buf[6] & 0xff) + 100; /* Assume 20YY */
return rtc_valid_tm(dt);
}
static int ds3234_set_time(struct device *dev, struct rtc_time *dt)
{
ds3234_set_reg(dev, DS3234_REG_SECONDS, bin2bcd(dt->tm_sec));
ds3234_set_reg(dev, DS3234_REG_MINUTES, bin2bcd(dt->tm_min));
ds3234_set_reg(dev, DS3234_REG_HOURS, bin2bcd(dt->tm_hour) & 0x3f);
/* 0 = Sun */
ds3234_set_reg(dev, DS3234_REG_DAY, bin2bcd(dt->tm_wday + 1));
ds3234_set_reg(dev, DS3234_REG_DATE, bin2bcd(dt->tm_mday));
/* 0 = Jan */
ds3234_set_reg(dev, DS3234_REG_MONTH, bin2bcd(dt->tm_mon + 1));
/* Assume 20YY although we just want to make sure not to go negative. */
if (dt->tm_year > 100)
dt->tm_year -= 100;
ds3234_set_reg(dev, DS3234_REG_YEAR, bin2bcd(dt->tm_year));
return 0;
}
static const struct rtc_class_ops ds3234_rtc_ops = {
.read_time = ds3234_read_time,
.set_time = ds3234_set_time,
};
static int ds3234_probe(struct spi_device *spi)
{
struct rtc_device *rtc;
unsigned char tmp;
int res;
spi->mode = SPI_MODE_3;
spi->bits_per_word = 8;
spi_setup(spi);
res = ds3234_get_reg(&spi->dev, DS3234_REG_SECONDS, &tmp);
if (res != 0)
return res;
/* Control settings
*
* CONTROL_REG
* BIT 7 6 5 4 3 2 1 0
* EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE
*
* 0 0 0 1 1 1 0 0
*
* CONTROL_STAT_REG
* BIT 7 6 5 4 3 2 1 0
* OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F
*
* 1 0 0 0 1 0 0 0
*/
ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp);
ds3234_set_reg(&spi->dev, DS3234_REG_CONTROL, tmp & 0x1c);
ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp);
ds3234_set_reg(&spi->dev, DS3234_REG_CONT_STAT, tmp & 0x88);
/* Print our settings */
ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp);
dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp);
ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp);
dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp);
rtc = devm_rtc_device_register(&spi->dev, "ds3234",
&ds3234_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
spi_set_drvdata(spi, rtc);
return 0;
}
static struct spi_driver ds3234_driver = {
.driver = {
.name = "ds3234",
},
.probe = ds3234_probe,
};
module_spi_driver(ds3234_driver);
MODULE_DESCRIPTION("DS3234 SPI RTC driver");
MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ds3234");