-/* drivers/rtc/rtc-ds3234.c
+/* rtc-ds3234.c
*
* Driver for Dallas Semiconductor (DS3234) SPI RTC with Integrated Crystal
* and SRAM.
* 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/init.h>
+#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#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,
+static int ds3234_set_reg(struct device *dev, unsigned char address,
unsigned char data)
{
struct spi_device *spi = to_spi_device(dev);
buf[0] = address | 0x80;
buf[1] = data;
- spi_write(spi, buf, 2);
+ 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);
- 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);
+ *data = address & 0x7f;
- /* 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;
+ return spi_write_then_read(spi, data, 1, data, 1);
}
-static int ds3234_get_datetime(struct device *dev, struct rtc_time *dt)
+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);
- 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
+ buf[0] = 0x00; /* Start address */
- return 0;
+ 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_datetime(struct device *dev, struct rtc_time *dt)
+static int ds3234_set_time(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);
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,
{
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);
+ if (res != 0)
return res;
- }
/* Control settings
*
ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp);
dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp);
+ rtc = rtc_device_register("ds3234",
+ &spi->dev, &ds3234_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ dev_set_drvdata(&spi->dev, rtc);
+
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);
+ struct rtc_device *rtc = platform_get_drvdata(spi);
+ rtc_device_unregister(rtc);
return 0;
}
static struct spi_driver ds3234_driver = {
.driver = {
.name = "ds3234",
- .bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ds3234_probe,
static __init int ds3234_init(void)
{
- printk(KERN_INFO "DS3234 SPI RTC Driver\n");
return spi_register_driver(&ds3234_driver);
}
module_init(ds3234_init);
projects / linux-2.6-omap-h63xx.git / commitdiff