diff options
| -rw-r--r-- | drivers/rtc/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/rtc/rtc-ds1390.c | 72 |
2 files changed, 24 insertions, 51 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 74bd6160dfb..fe1d7a2c27e 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -317,7 +317,8 @@ config RTC_DRV_DS1305 config RTC_DRV_DS1390 tristate "Dallas/Maxim DS1390/93/94" help - If you say yes here you get support for the DS1390/93/94 chips. + If you say yes here you get support for the + Dallas/Maxim DS1390/93/94 chips. This driver only supports the RTC feature, and not other chip features such as alarms and trickle charging. diff --git a/drivers/rtc/rtc-ds1390.c b/drivers/rtc/rtc-ds1390.c index 599e976bf01..e54b5c619bd 100644 --- a/drivers/rtc/rtc-ds1390.c +++ b/drivers/rtc/rtc-ds1390.c @@ -1,5 +1,5 @@ /* - * rtc-ds1390.c -- driver for DS1390/93/94 + * rtc-ds1390.c -- driver for the Dallas/Maxim DS1390/93/94 SPI RTC * * Copyright (C) 2008 Mercury IMC Ltd * Written by Mark Jackson <mpfj@mimc.co.uk> @@ -8,11 +8,13 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * - * NOTE : Currently this driver only supports the bare minimum for read - * and write the RTC. The extra features provided by the chip family + * NOTE: Currently this driver only supports the bare minimum for read + * and write the RTC. The extra features provided by the chip family * (alarms, trickle charger, different control registers) are unavailable. */ +#include <linux/init.h> +#include <linux/module.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/spi/spi.h> @@ -42,20 +44,6 @@ struct ds1390 { u8 txrx_buf[9]; /* cmd + 8 registers */ }; -static void ds1390_set_reg(struct device *dev, unsigned char address, - unsigned char data) -{ - struct spi_device *spi = to_spi_device(dev); - struct ds1390 *chip = dev_get_drvdata(dev); - - /* Set MSB to indicate write */ - chip->txrx_buf[0] = address | 0x80; - chip->txrx_buf[1] = data; - - /* do the i/o */ - spi_write_then_read(spi, chip->txrx_buf, 2, NULL, 0); -} - static int ds1390_get_reg(struct device *dev, unsigned char address, unsigned char *data) { @@ -78,7 +66,7 @@ static int ds1390_get_reg(struct device *dev, unsigned char address, return 0; } -static int ds1390_get_datetime(struct device *dev, struct rtc_time *dt) +static int ds1390_read_time(struct device *dev, struct rtc_time *dt) { struct spi_device *spi = to_spi_device(dev); struct ds1390 *chip = dev_get_drvdata(dev); @@ -107,7 +95,7 @@ static int ds1390_get_datetime(struct device *dev, struct rtc_time *dt) return rtc_valid_tm(dt); } -static int ds1390_set_datetime(struct device *dev, struct rtc_time *dt) +static int ds1390_set_time(struct device *dev, struct rtc_time *dt) { struct spi_device *spi = to_spi_device(dev); struct ds1390 *chip = dev_get_drvdata(dev); @@ -127,16 +115,6 @@ static int ds1390_set_datetime(struct device *dev, struct rtc_time *dt) return spi_write_then_read(spi, chip->txrx_buf, 8, NULL, 0); } -static int ds1390_read_time(struct device *dev, struct rtc_time *tm) -{ - return ds1390_get_datetime(dev, tm); -} - -static int ds1390_set_time(struct device *dev, struct rtc_time *tm) -{ - return ds1390_set_datetime(dev, tm); -} - static const struct rtc_class_ops ds1390_rtc_ops = { .read_time = ds1390_read_time, .set_time = ds1390_set_time, @@ -149,46 +127,40 @@ static int __devinit ds1390_probe(struct spi_device *spi) struct ds1390 *chip; int res; - printk(KERN_DEBUG "DS1390 SPI RTC driver\n"); - - rtc = rtc_device_register("ds1390", - &spi->dev, &ds1390_rtc_ops, THIS_MODULE); - if (IS_ERR(rtc)) { - printk(KERN_ALERT "RTC : unable to register device\n"); - return PTR_ERR(rtc); - } - spi->mode = SPI_MODE_3; spi->bits_per_word = 8; spi_setup(spi); chip = kzalloc(sizeof *chip, GFP_KERNEL); if (!chip) { - printk(KERN_ALERT "RTC : unable to allocate device memory\n"); - rtc_device_unregister(rtc); + dev_err(&spi->dev, "unable to allocate device memory\n"); return -ENOMEM; } - chip->rtc = rtc; dev_set_drvdata(&spi->dev, chip); res = ds1390_get_reg(&spi->dev, DS1390_REG_SECONDS, &tmp); - if (res) { - printk(KERN_ALERT "RTC : unable to read device\n"); - rtc_device_unregister(rtc); + if (res != 0) { + dev_err(&spi->dev, "unable to read device\n"); + kfree(chip); return res; } - return 0; + chip->rtc = rtc_device_register("ds1390", + &spi->dev, &ds1390_rtc_ops, THIS_MODULE); + if (IS_ERR(chip->rtc)) { + dev_err(&spi->dev, "unable to register device\n"); + res = PTR_ERR(chip->rtc); + kfree(chip); + } + + return res; } static int __devexit ds1390_remove(struct spi_device *spi) { struct ds1390 *chip = platform_get_drvdata(spi); - struct rtc_device *rtc = chip->rtc; - - if (rtc) - rtc_device_unregister(rtc); + rtc_device_unregister(chip->rtc); kfree(chip); return 0; @@ -215,6 +187,6 @@ static __exit void ds1390_exit(void) } module_exit(ds1390_exit); -MODULE_DESCRIPTION("DS1390/93/94 SPI RTC driver"); +MODULE_DESCRIPTION("Dallas/Maxim DS1390/93/94 SPI RTC driver"); MODULE_AUTHOR("Mark Jackson <mpfj@mimc.co.uk>"); MODULE_LICENSE("GPL"); |