rtc: merge ds3232 and ds3234
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
Alexandre Belloni
parent
370927c4b6
commit
080481f54e
4 changed files with 189 additions and 194 deletions
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@ -247,16 +247,6 @@ config RTC_DRV_DS1672
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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-ds1672.
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config RTC_DRV_DS3232
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tristate "Dallas/Maxim DS3232"
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help
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If you say yes here you get support for Dallas Semiconductor
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DS3232 real-time clock chips. If an interrupt is associated
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with the device, the alarm functionality is supported.
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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-ds3232.
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config RTC_DRV_HYM8563
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tristate "Haoyu Microelectronics HYM8563"
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depends on OF
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@ -733,15 +723,6 @@ config RTC_DRV_MAX6902
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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-max6902.
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config RTC_DRV_DS3234
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tristate "Maxim/Dallas DS3234"
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help
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If you say yes here you get support for the
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Maxim/Dallas DS3234 SPI RTC chip.
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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-ds3234.
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config RTC_DRV_PCF2123
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tristate "NXP PCF2123"
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help
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@ -761,6 +742,31 @@ config RTC_DRV_MCP795
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endif # SPI_MASTER
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#
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# Helper to resolve issues with configs that have SPI enabled but I2C
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# modular. See SND_SOC_I2C_AND_SPI for more information
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#
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config RTC_I2C_AND_SPI
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tristate
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default m if I2C=m
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default y if I2C=y
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default y if SPI_MASTER=y
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select REGMAP_I2C if I2C
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select REGMAP_SPI if SPI_MASTER
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comment "SPI and I2C RTC drivers"
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config RTC_DRV_DS3232
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tristate "Dallas/Maxim DS3232/DS3234"
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depends on RTC_I2C_AND_SPI
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help
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If you say yes here you get support for Dallas Semiconductor
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DS3232 and DS3234 real-time clock chips. If an interrupt is associated
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with the device, the alarm functionality is supported.
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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-ds3232.
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comment "Platform RTC drivers"
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# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
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@ -60,7 +60,6 @@ obj-$(CONFIG_RTC_DRV_DS1685_FAMILY) += rtc-ds1685.o
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obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
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obj-$(CONFIG_RTC_DRV_DS2404) += rtc-ds2404.o
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obj-$(CONFIG_RTC_DRV_DS3232) += rtc-ds3232.o
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obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o
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obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o
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obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o
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obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
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@ -1,8 +1,9 @@
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/*
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* RTC client/driver for the Maxim/Dallas DS3232 Real-Time Clock over I2C
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* RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock
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*
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* Copyright (C) 2009-2011 Freescale Semiconductor.
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* Author: Jack Lan <jack.lan@freescale.com>
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* Copyright (C) 2008 MIMOMax Wireless Ltd.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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@ -16,6 +17,7 @@
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/spi/spi.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/workqueue.h>
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@ -481,6 +483,8 @@ static const struct dev_pm_ops ds3232_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume)
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};
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#if IS_ENABLED(CONFIG_I2C)
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static int ds3232_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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@ -520,8 +524,165 @@ static struct i2c_driver ds3232_driver = {
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.remove = ds3232_i2c_remove,
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.id_table = ds3232_id,
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};
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module_i2c_driver(ds3232_driver);
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static int ds3232_register_driver(void)
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{
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return i2c_add_driver(&ds3232_driver);
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}
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static void ds3232_unregister_driver(void)
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{
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i2c_del_driver(&ds3232_driver);
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}
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#else
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static int ds3232_register_driver(void)
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{
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return 0;
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}
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static void ds3232_unregister_driver(void)
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{
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}
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#endif
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#if IS_ENABLED(CONFIG_SPI_MASTER)
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static int ds3234_probe(struct spi_device *spi)
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{
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int res;
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unsigned int tmp;
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static const struct regmap_config config = {
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.reg_bits = 8,
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.val_bits = 8,
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.write_flag_mask = 0x80,
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};
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struct regmap *regmap;
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regmap = devm_regmap_init_spi(spi, &config);
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if (IS_ERR(regmap)) {
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dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
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__func__, PTR_ERR(regmap));
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return PTR_ERR(regmap);
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}
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spi->mode = SPI_MODE_3;
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spi->bits_per_word = 8;
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spi_setup(spi);
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res = regmap_read(regmap, DS3232_REG_SECONDS, &tmp);
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if (res)
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return res;
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/* Control settings
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*
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* CONTROL_REG
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* BIT 7 6 5 4 3 2 1 0
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* EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE
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*
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* 0 0 0 1 1 1 0 0
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*
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* CONTROL_STAT_REG
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* BIT 7 6 5 4 3 2 1 0
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* OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F
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*
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* 1 0 0 0 1 0 0 0
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*/
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res = regmap_read(regmap, DS3232_REG_CR, &tmp);
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if (res)
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return res;
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res = regmap_write(regmap, DS3232_REG_CR, tmp & 0x1c);
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if (res)
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return res;
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res = regmap_read(regmap, DS3232_REG_SR, &tmp);
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if (res)
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return res;
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res = regmap_write(regmap, DS3232_REG_SR, tmp & 0x88);
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if (res)
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return res;
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/* Print our settings */
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res = regmap_read(regmap, DS3232_REG_CR, &tmp);
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if (res)
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return res;
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dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp);
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res = regmap_read(regmap, DS3232_REG_SR, &tmp);
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if (res)
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return res;
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dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp);
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return ds3232_probe(&spi->dev, regmap, spi->irq, "ds3234");
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}
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static int ds3234_remove(struct spi_device *spi)
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{
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return ds3232_remove(&spi->dev);
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}
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static struct spi_driver ds3234_driver = {
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.driver = {
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.name = "ds3234",
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},
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.probe = ds3234_probe,
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.remove = ds3234_remove,
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};
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static int ds3234_register_driver(void)
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{
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return spi_register_driver(&ds3234_driver);
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}
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static void ds3234_unregister_driver(void)
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{
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spi_unregister_driver(&ds3234_driver);
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}
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#else
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static int ds3234_register_driver(void)
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{
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return 0;
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}
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static void ds3234_unregister_driver(void)
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{
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}
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#endif
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static int __init ds323x_init(void)
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{
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int ret;
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ret = ds3232_register_driver();
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if (ret) {
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pr_err("Failed to register ds3232 driver: %d\n", ret);
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return ret;
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}
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ret = ds3234_register_driver();
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if (ret) {
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pr_err("Failed to register ds3234 driver: %d\n", ret);
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ds3232_unregister_driver();
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}
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return ret;
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}
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module_init(ds323x_init)
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static void __exit ds323x_exit(void)
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{
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ds3234_unregister_driver();
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ds3232_unregister_driver();
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}
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module_exit(ds323x_exit)
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MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
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MODULE_DESCRIPTION("Maxim/Dallas DS3232 RTC Driver");
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MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>");
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MODULE_DESCRIPTION("Maxim/Dallas DS3232/DS3234 RTC Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("spi:ds3234");
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@ -1,171 +0,0 @@
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/* rtc-ds3234.c
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*
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* Driver for Dallas Semiconductor (DS3234) SPI RTC with Integrated Crystal
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* and SRAM.
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*
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* Copyright (C) 2008 MIMOMax Wireless Ltd.
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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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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/spi/spi.h>
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#include <linux/bcd.h>
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#define DS3234_REG_SECONDS 0x00
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#define DS3234_REG_MINUTES 0x01
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#define DS3234_REG_HOURS 0x02
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#define DS3234_REG_DAY 0x03
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#define DS3234_REG_DATE 0x04
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#define DS3234_REG_MONTH 0x05
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#define DS3234_REG_YEAR 0x06
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#define DS3234_REG_CENTURY (1 << 7) /* Bit 7 of the Month register */
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#define DS3234_REG_CONTROL 0x0E
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#define DS3234_REG_CONT_STAT 0x0F
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static int ds3234_set_reg(struct device *dev, unsigned char address,
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unsigned char data)
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{
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struct spi_device *spi = to_spi_device(dev);
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unsigned char buf[2];
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/* MSB must be '1' to indicate write */
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buf[0] = address | 0x80;
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buf[1] = data;
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return spi_write_then_read(spi, buf, 2, NULL, 0);
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}
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static int ds3234_get_reg(struct device *dev, unsigned char address,
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unsigned char *data)
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{
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struct spi_device *spi = to_spi_device(dev);
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*data = address & 0x7f;
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return spi_write_then_read(spi, data, 1, data, 1);
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}
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static int ds3234_read_time(struct device *dev, struct rtc_time *dt)
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{
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int err;
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unsigned char buf[8];
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struct spi_device *spi = to_spi_device(dev);
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buf[0] = 0x00; /* Start address */
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err = spi_write_then_read(spi, buf, 1, buf, 8);
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if (err != 0)
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return err;
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/* Seconds, Minutes, Hours, Day, Date, Month, Year */
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dt->tm_sec = bcd2bin(buf[0]);
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dt->tm_min = bcd2bin(buf[1]);
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dt->tm_hour = bcd2bin(buf[2] & 0x3f);
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dt->tm_wday = bcd2bin(buf[3]) - 1; /* 0 = Sun */
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dt->tm_mday = bcd2bin(buf[4]);
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dt->tm_mon = bcd2bin(buf[5] & 0x1f) - 1; /* 0 = Jan */
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dt->tm_year = bcd2bin(buf[6] & 0xff) + 100; /* Assume 20YY */
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return rtc_valid_tm(dt);
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}
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static int ds3234_set_time(struct device *dev, struct rtc_time *dt)
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{
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ds3234_set_reg(dev, DS3234_REG_SECONDS, bin2bcd(dt->tm_sec));
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ds3234_set_reg(dev, DS3234_REG_MINUTES, bin2bcd(dt->tm_min));
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ds3234_set_reg(dev, DS3234_REG_HOURS, bin2bcd(dt->tm_hour) & 0x3f);
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/* 0 = Sun */
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ds3234_set_reg(dev, DS3234_REG_DAY, bin2bcd(dt->tm_wday + 1));
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ds3234_set_reg(dev, DS3234_REG_DATE, bin2bcd(dt->tm_mday));
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/* 0 = Jan */
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ds3234_set_reg(dev, DS3234_REG_MONTH, bin2bcd(dt->tm_mon + 1));
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/* Assume 20YY although we just want to make sure not to go negative. */
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if (dt->tm_year > 100)
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dt->tm_year -= 100;
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ds3234_set_reg(dev, DS3234_REG_YEAR, bin2bcd(dt->tm_year));
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return 0;
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}
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static const struct rtc_class_ops ds3234_rtc_ops = {
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.read_time = ds3234_read_time,
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.set_time = ds3234_set_time,
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};
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static int ds3234_probe(struct spi_device *spi)
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{
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struct rtc_device *rtc;
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unsigned char tmp;
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int res;
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spi->mode = SPI_MODE_3;
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spi->bits_per_word = 8;
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spi_setup(spi);
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res = ds3234_get_reg(&spi->dev, DS3234_REG_SECONDS, &tmp);
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if (res != 0)
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return res;
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/* Control settings
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*
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* CONTROL_REG
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* BIT 7 6 5 4 3 2 1 0
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* EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE
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*
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* 0 0 0 1 1 1 0 0
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*
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* CONTROL_STAT_REG
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* BIT 7 6 5 4 3 2 1 0
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* OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F
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*
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* 1 0 0 0 1 0 0 0
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*/
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ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp);
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ds3234_set_reg(&spi->dev, DS3234_REG_CONTROL, tmp & 0x1c);
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ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp);
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ds3234_set_reg(&spi->dev, DS3234_REG_CONT_STAT, tmp & 0x88);
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/* Print our settings */
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ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp);
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dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp);
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ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp);
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dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp);
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rtc = devm_rtc_device_register(&spi->dev, "ds3234",
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&ds3234_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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spi_set_drvdata(spi, rtc);
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return 0;
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}
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static struct spi_driver ds3234_driver = {
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.driver = {
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.name = "ds3234",
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},
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.probe = ds3234_probe,
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};
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module_spi_driver(ds3234_driver);
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MODULE_DESCRIPTION("DS3234 SPI RTC driver");
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MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("spi:ds3234");
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