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author | Akinobu Mita <akinobu.mita@gmail.com> | 2016-03-07 00:27:48 +0900 |
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committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2016-03-14 17:08:35 +0100 |
commit | 080481f54ef621211d6c75a03dc652fb6ed04222 (patch) | |
tree | fec4fb13bc3670f85568f650a13ac936a34d2914 /drivers/rtc/rtc-ds3232.c | |
parent | 370927c4b651539c65dd8d17dd5079526cd8401d (diff) | |
download | linux-080481f54ef621211d6c75a03dc652fb6ed04222.tar.gz linux-080481f54ef621211d6c75a03dc652fb6ed04222.tar.bz2 linux-080481f54ef621211d6c75a03dc652fb6ed04222.zip |
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>
Diffstat (limited to 'drivers/rtc/rtc-ds3232.c')
-rw-r--r-- | drivers/rtc/rtc-ds3232.c | 167 |
1 files changed, 164 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c index 5791f996fa32..ca43bfcbb846 100644 --- a/drivers/rtc/rtc-ds3232.c +++ b/drivers/rtc/rtc-ds3232.c @@ -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. * 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 * under the terms of the GNU General Public License as published by the @@ -16,6 +17,7 @@ #include <linux/module.h> #include <linux/interrupt.h> #include <linux/i2c.h> +#include <linux/spi/spi.h> #include <linux/rtc.h> #include <linux/bcd.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) }; +#if IS_ENABLED(CONFIG_I2C) + static int ds3232_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -520,8 +524,165 @@ static struct i2c_driver ds3232_driver = { .remove = ds3232_i2c_remove, .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_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_ALIAS("spi:ds3234"); |