mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 10:46:44 +07:00
bcc378e777
When ds3234 is built-in, the final links fails with the following vague error message: `.exit.text' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.exit.text' of drivers/built-in.o ds3234_remove() cannot be marked __exit, as it's accessed via __devexit_p(). In addition, mark ds3234_probe() __devinit while we're at it. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
291 lines
7.1 KiB
C
291 lines
7.1 KiB
C
/* drivers/rtc/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.
|
|
*
|
|
* Changelog:
|
|
*
|
|
* 07-May-2008: Dennis Aberilla <denzzzhome@yahoo.com>
|
|
* - Created based on the max6902 code. Only implements the
|
|
* date/time keeping functions; no SRAM yet.
|
|
*/
|
|
|
|
#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
|
|
|
|
#undef DS3234_DEBUG
|
|
|
|
struct ds3234 {
|
|
struct rtc_device *rtc;
|
|
u8 buf[8]; /* Burst read: addr + 7 regs */
|
|
u8 tx_buf[2];
|
|
u8 rx_buf[2];
|
|
};
|
|
|
|
static void 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;
|
|
|
|
spi_write(spi, buf, 2);
|
|
}
|
|
|
|
static int ds3234_get_reg(struct device *dev, unsigned char address,
|
|
unsigned char *data)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct ds3234 *chip = dev_get_drvdata(dev);
|
|
struct spi_message message;
|
|
struct spi_transfer xfer;
|
|
int status;
|
|
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
/* Build our spi message */
|
|
spi_message_init(&message);
|
|
memset(&xfer, 0, sizeof(xfer));
|
|
|
|
/* Address + dummy tx byte */
|
|
xfer.len = 2;
|
|
xfer.tx_buf = chip->tx_buf;
|
|
xfer.rx_buf = chip->rx_buf;
|
|
|
|
chip->tx_buf[0] = address;
|
|
chip->tx_buf[1] = 0xff;
|
|
|
|
spi_message_add_tail(&xfer, &message);
|
|
|
|
/* do the i/o */
|
|
status = spi_sync(spi, &message);
|
|
if (status == 0)
|
|
status = message.status;
|
|
else
|
|
return status;
|
|
|
|
*data = chip->rx_buf[1];
|
|
|
|
return status;
|
|
}
|
|
|
|
static int ds3234_get_datetime(struct device *dev, struct rtc_time *dt)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct ds3234 *chip = dev_get_drvdata(dev);
|
|
struct spi_message message;
|
|
struct spi_transfer xfer;
|
|
int status;
|
|
|
|
/* build the message */
|
|
spi_message_init(&message);
|
|
memset(&xfer, 0, sizeof(xfer));
|
|
xfer.len = 1 + 7; /* Addr + 7 registers */
|
|
xfer.tx_buf = chip->buf;
|
|
xfer.rx_buf = chip->buf;
|
|
chip->buf[0] = 0x00; /* Start address */
|
|
spi_message_add_tail(&xfer, &message);
|
|
|
|
/* do the i/o */
|
|
status = spi_sync(spi, &message);
|
|
if (status == 0)
|
|
status = message.status;
|
|
else
|
|
return status;
|
|
|
|
/* Seconds, Minutes, Hours, Day, Date, Month, Year */
|
|
dt->tm_sec = bcd2bin(chip->buf[1]);
|
|
dt->tm_min = bcd2bin(chip->buf[2]);
|
|
dt->tm_hour = bcd2bin(chip->buf[3] & 0x3f);
|
|
dt->tm_wday = bcd2bin(chip->buf[4]) - 1; /* 0 = Sun */
|
|
dt->tm_mday = bcd2bin(chip->buf[5]);
|
|
dt->tm_mon = bcd2bin(chip->buf[6] & 0x1f) - 1; /* 0 = Jan */
|
|
dt->tm_year = bcd2bin(chip->buf[7] & 0xff) + 100; /* Assume 20YY */
|
|
|
|
#ifdef DS3234_DEBUG
|
|
dev_dbg(dev, "\n%s : Read RTC values\n", __func__);
|
|
dev_dbg(dev, "tm_hour: %i\n", dt->tm_hour);
|
|
dev_dbg(dev, "tm_min : %i\n", dt->tm_min);
|
|
dev_dbg(dev, "tm_sec : %i\n", dt->tm_sec);
|
|
dev_dbg(dev, "tm_wday: %i\n", dt->tm_wday);
|
|
dev_dbg(dev, "tm_mday: %i\n", dt->tm_mday);
|
|
dev_dbg(dev, "tm_mon : %i\n", dt->tm_mon);
|
|
dev_dbg(dev, "tm_year: %i\n", dt->tm_year);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds3234_set_datetime(struct device *dev, struct rtc_time *dt)
|
|
{
|
|
#ifdef DS3234_DEBUG
|
|
dev_dbg(dev, "\n%s : Setting RTC values\n", __func__);
|
|
dev_dbg(dev, "tm_sec : %i\n", dt->tm_sec);
|
|
dev_dbg(dev, "tm_min : %i\n", dt->tm_min);
|
|
dev_dbg(dev, "tm_hour: %i\n", dt->tm_hour);
|
|
dev_dbg(dev, "tm_wday: %i\n", dt->tm_wday);
|
|
dev_dbg(dev, "tm_mday: %i\n", dt->tm_mday);
|
|
dev_dbg(dev, "tm_mon : %i\n", dt->tm_mon);
|
|
dev_dbg(dev, "tm_year: %i\n", dt->tm_year);
|
|
#endif
|
|
|
|
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 int ds3234_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
return ds3234_get_datetime(dev, tm);
|
|
}
|
|
|
|
static int ds3234_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
return ds3234_set_datetime(dev, tm);
|
|
}
|
|
|
|
static const struct rtc_class_ops ds3234_rtc_ops = {
|
|
.read_time = ds3234_read_time,
|
|
.set_time = ds3234_set_time,
|
|
};
|
|
|
|
static int __devinit ds3234_probe(struct spi_device *spi)
|
|
{
|
|
struct rtc_device *rtc;
|
|
unsigned char tmp;
|
|
struct ds3234 *chip;
|
|
int res;
|
|
|
|
rtc = rtc_device_register("ds3234",
|
|
&spi->dev, &ds3234_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(rtc))
|
|
return PTR_ERR(rtc);
|
|
|
|
spi->mode = SPI_MODE_3;
|
|
spi->bits_per_word = 8;
|
|
spi_setup(spi);
|
|
|
|
chip = kzalloc(sizeof(struct ds3234), GFP_KERNEL);
|
|
if (!chip) {
|
|
rtc_device_unregister(rtc);
|
|
return -ENOMEM;
|
|
}
|
|
chip->rtc = rtc;
|
|
dev_set_drvdata(&spi->dev, chip);
|
|
|
|
res = ds3234_get_reg(&spi->dev, DS3234_REG_SECONDS, &tmp);
|
|
if (res) {
|
|
rtc_device_unregister(rtc);
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit ds3234_remove(struct spi_device *spi)
|
|
{
|
|
struct ds3234 *chip = platform_get_drvdata(spi);
|
|
struct rtc_device *rtc = chip->rtc;
|
|
|
|
if (rtc)
|
|
rtc_device_unregister(rtc);
|
|
|
|
kfree(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct spi_driver ds3234_driver = {
|
|
.driver = {
|
|
.name = "ds3234",
|
|
.bus = &spi_bus_type,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ds3234_probe,
|
|
.remove = __devexit_p(ds3234_remove),
|
|
};
|
|
|
|
static __init int ds3234_init(void)
|
|
{
|
|
printk(KERN_INFO "DS3234 SPI RTC Driver\n");
|
|
return spi_register_driver(&ds3234_driver);
|
|
}
|
|
module_init(ds3234_init);
|
|
|
|
static __exit void ds3234_exit(void)
|
|
{
|
|
spi_unregister_driver(&ds3234_driver);
|
|
}
|
|
module_exit(ds3234_exit);
|
|
|
|
MODULE_DESCRIPTION("DS3234 SPI RTC driver");
|
|
MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>");
|
|
MODULE_LICENSE("GPL");
|