5 files changed, 1047 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8abbb2020af9..123092d8a984 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -277,6 +277,14 @@ config RTC_DRV_FM3130
           This driver can also be built as a module. If so the module
           will be called rtc-fm3130.
 
+config RTC_DRV_RX8581
+        tristate "Epson RX-8581"
+        help
+          If you say yes here you will get support for the Epson RX-8581.
+
+          This driver can also be built as a module. If so the module
+          will be called rtc-rx8581.
+
 endif # I2C
 
 comment "SPI RTC drivers"
@@ -302,6 +310,17 @@ config RTC_DRV_DS1305
           This driver can also be built as a module. If so, the module
           will be called rtc-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.
+
+          This driver only supports the RTC feature, and not other chip
+          features such as alarms and trickle charging.
+
+          This driver can also be built as a module. If so, the module
+          will be called rtc-ds1390.
+
 config RTC_DRV_MAX6902
         tristate "Maxim MAX6902"
         help
@@ -468,6 +487,16 @@ config RTC_DRV_V3020
           This driver can also be built as a module. If so, the module
           will be called rtc-v3020.
 
+config RTC_DRV_WM8350
+        tristate "Wolfson Microelectronics WM8350 RTC"
+        depends on MFD_WM8350
+        help
+          If you say yes here you will get support for the RTC subsystem
+          of the Wolfson Microelectronics WM8350.
+
+          This driver can also be built as a module. If so, the module
+          will be called "rtc-wm8350".
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_OMAP
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index e9e8474cc8fe..6e79c912bf9e 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_RTC_DRV_DS1302)	+= rtc-ds1302.o
 obj-$(CONFIG_RTC_DRV_DS1305)    += rtc-ds1305.o
 obj-$(CONFIG_RTC_DRV_DS1307)    += rtc-ds1307.o
 obj-$(CONFIG_RTC_DRV_DS1374)    += rtc-ds1374.o
+obj-$(CONFIG_RTC_DRV_DS1390)    += rtc-ds1390.o
 obj-$(CONFIG_RTC_DRV_DS1511)    += rtc-ds1511.o
 obj-$(CONFIG_RTC_DRV_DS1553)    += rtc-ds1553.o
 obj-$(CONFIG_RTC_DRV_DS1672)    += rtc-ds1672.o
@@ -57,6 +58,7 @@ obj-$(CONFIG_RTC_DRV_R9701)	+= rtc-r9701.o
 obj-$(CONFIG_RTC_DRV_RS5C313)   += rtc-rs5c313.o
 obj-$(CONFIG_RTC_DRV_RS5C348)   += rtc-rs5c348.o
 obj-$(CONFIG_RTC_DRV_RS5C372)   += rtc-rs5c372.o
+obj-$(CONFIG_RTC_DRV_RX8581)    += rtc-rx8581.o
 obj-$(CONFIG_RTC_DRV_S35390A)   += rtc-s35390a.o
 obj-$(CONFIG_RTC_DRV_S3C)       += rtc-s3c.o
 obj-$(CONFIG_RTC_DRV_SA1100)    += rtc-sa1100.o
@@ -66,4 +68,5 @@ obj-$(CONFIG_RTC_DRV_TEST)	+= rtc-test.o
 obj-$(CONFIG_RTC_DRV_TWL4030)   += rtc-twl4030.o
 obj-$(CONFIG_RTC_DRV_V3020)     += rtc-v3020.o
 obj-$(CONFIG_RTC_DRV_VR41XX)    += rtc-vr41xx.o
+obj-$(CONFIG_RTC_DRV_WM8350)    += rtc-wm8350.o
 obj-$(CONFIG_RTC_DRV_X1205)     += rtc-x1205.o
diff --git a/drivers/rtc/rtc-ds1390.c b/drivers/rtc/rtc-ds1390.c
new file mode 100644
index 000000000000..599e976bf014
--- /dev/null
+++ b/drivers/rtc/rtc-ds1390.c
@@ -0,0 +1,220 @@
+/*
+ * rtc-ds1390.c -- driver for DS1390/93/94
+ *
+ * Copyright (C) 2008 Mercury IMC Ltd
+ * Written by Mark Jackson <mpfj@mimc.co.uk>
+ *
+ * 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.
+ *
+ * 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/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/spi/spi.h>
+#include <linux/bcd.h>
+
+#define DS1390_REG_100THS               0x00
+#define DS1390_REG_SECONDS              0x01
+#define DS1390_REG_MINUTES              0x02
+#define DS1390_REG_HOURS                0x03
+#define DS1390_REG_DAY                  0x04
+#define DS1390_REG_DATE                 0x05
+#define DS1390_REG_MONTH_CENT           0x06
+#define DS1390_REG_YEAR                 0x07
+
+#define DS1390_REG_ALARM_100THS         0x08
+#define DS1390_REG_ALARM_SECONDS        0x09
+#define DS1390_REG_ALARM_MINUTES        0x0A
+#define DS1390_REG_ALARM_HOURS          0x0B
+#define DS1390_REG_ALARM_DAY_DATE       0x0C
+
+#define DS1390_REG_CONTROL              0x0D
+#define DS1390_REG_STATUS               0x0E
+#define DS1390_REG_TRICKLE              0x0F
+
+struct ds1390 {
+        struct rtc_device *rtc;
+        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)
+{
+        struct spi_device *spi = to_spi_device(dev);
+        struct ds1390 *chip = dev_get_drvdata(dev);
+        int status;
+
+        if (!data)
+                return -EINVAL;
+
+        /* Clear MSB to indicate read */
+        chip->txrx_buf[0] = address & 0x7f;
+        /* do the i/o */
+        status = spi_write_then_read(spi, chip->txrx_buf, 1, chip->txrx_buf, 1);
+        if (status != 0)
+                return status;
+
+        *data = chip->txrx_buf[1];
+
+        return 0;
+}
+
+static int ds1390_get_datetime(struct device *dev, struct rtc_time *dt)
+{
+        struct spi_device *spi = to_spi_device(dev);
+        struct ds1390 *chip = dev_get_drvdata(dev);
+        int status;
+
+        /* build the message */
+        chip->txrx_buf[0] = DS1390_REG_SECONDS;
+
+        /* do the i/o */
+        status = spi_write_then_read(spi, chip->txrx_buf, 1, chip->txrx_buf, 8);
+        if (status != 0)
+                return status;
+
+        /* The chip sends data in this order:
+         * Seconds, Minutes, Hours, Day, Date, Month / Century, Year */
+        dt->tm_sec      = bcd2bin(chip->txrx_buf[0]);
+        dt->tm_min      = bcd2bin(chip->txrx_buf[1]);
+        dt->tm_hour     = bcd2bin(chip->txrx_buf[2]);
+        dt->tm_wday     = bcd2bin(chip->txrx_buf[3]);
+        dt->tm_mday     = bcd2bin(chip->txrx_buf[4]);
+        /* mask off century bit */
+        dt->tm_mon      = bcd2bin(chip->txrx_buf[5] & 0x7f) - 1;
+        /* adjust for century bit */
+        dt->tm_year = bcd2bin(chip->txrx_buf[6]) + ((chip->txrx_buf[5] & 0x80) ? 100 : 0);
+
+        return rtc_valid_tm(dt);
+}
+
+static int ds1390_set_datetime(struct device *dev, struct rtc_time *dt)
+{
+        struct spi_device *spi = to_spi_device(dev);
+        struct ds1390 *chip = dev_get_drvdata(dev);
+
+        /* build the message */
+        chip->txrx_buf[0] = DS1390_REG_SECONDS | 0x80;
+        chip->txrx_buf[1] = bin2bcd(dt->tm_sec);
+        chip->txrx_buf[2] = bin2bcd(dt->tm_min);
+        chip->txrx_buf[3] = bin2bcd(dt->tm_hour);
+        chip->txrx_buf[4] = bin2bcd(dt->tm_wday);
+        chip->txrx_buf[5] = bin2bcd(dt->tm_mday);
+        chip->txrx_buf[6] = bin2bcd(dt->tm_mon + 1) |
+                                ((dt->tm_year > 99) ? 0x80 : 0x00);
+        chip->txrx_buf[7] = bin2bcd(dt->tm_year % 100);
+
+        /* do the i/o */
+        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,
+};
+
+static int __devinit ds1390_probe(struct spi_device *spi)
+{
+        struct rtc_device *rtc;
+        unsigned char tmp;
+        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);
+                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);
+                return res;
+        }
+
+        return 0;
+}
+
+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);
+
+        kfree(chip);
+
+        return 0;
+}
+
+static struct spi_driver ds1390_driver = {
+        .driver = {
+                .name   = "rtc-ds1390",
+                .owner  = THIS_MODULE,
+        },
+        .probe  = ds1390_probe,
+        .remove = __devexit_p(ds1390_remove),
+};
+
+static __init int ds1390_init(void)
+{
+        return spi_register_driver(&ds1390_driver);
+}
+module_init(ds1390_init);
+
+static __exit void ds1390_exit(void)
+{
+        spi_unregister_driver(&ds1390_driver);
+}
+module_exit(ds1390_exit);
+
+MODULE_DESCRIPTION("DS1390/93/94 SPI RTC driver");
+MODULE_AUTHOR("Mark Jackson <mpfj@mimc.co.uk>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/rtc/rtc-rx8581.c b/drivers/rtc/rtc-rx8581.c
new file mode 100644
index 000000000000..c9522f3bc21c
--- /dev/null
+++ b/drivers/rtc/rtc-rx8581.c
@@ -0,0 +1,281 @@
+/*
+ * An I2C driver for the Epson RX8581 RTC
+ *
+ * Author: Martyn Welch <martyn.welch@gefanuc.com>
+ * Copyright 2008 GE Fanuc Intelligent Platforms Embedded Systems, Inc.
+ *
+ * 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.
+ *
+ * Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC)
+ * Copyright 2005-06 Tower Technologies
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/log2.h>
+
+#define DRV_VERSION "0.1"
+
+#define RX8581_REG_SC           0x00 /* Second in BCD */
+#define RX8581_REG_MN           0x01 /* Minute in BCD */
+#define RX8581_REG_HR           0x02 /* Hour in BCD */
+#define RX8581_REG_DW           0x03 /* Day of Week */
+#define RX8581_REG_DM           0x04 /* Day of Month in BCD */
+#define RX8581_REG_MO           0x05 /* Month in BCD */
+#define RX8581_REG_YR           0x06 /* Year in BCD */
+#define RX8581_REG_RAM          0x07 /* RAM */
+#define RX8581_REG_AMN          0x08 /* Alarm Min in BCD*/
+#define RX8581_REG_AHR          0x09 /* Alarm Hour in BCD */
+#define RX8581_REG_ADM          0x0A
+#define RX8581_REG_ADW          0x0A
+#define RX8581_REG_TMR0         0x0B
+#define RX8581_REG_TMR1         0x0C
+#define RX8581_REG_EXT          0x0D /* Extension Register */
+#define RX8581_REG_FLAG         0x0E /* Flag Register */
+#define RX8581_REG_CTRL         0x0F /* Control Register */
+
+
+/* Flag Register bit definitions */
+#define RX8581_FLAG_UF          0x20 /* Update */
+#define RX8581_FLAG_TF          0x10 /* Timer */
+#define RX8581_FLAG_AF          0x08 /* Alarm */
+#define RX8581_FLAG_VLF         0x02 /* Voltage Low */
+
+/* Control Register bit definitions */
+#define RX8581_CTRL_UIE         0x20 /* Update Interrupt Enable */
+#define RX8581_CTRL_TIE         0x10 /* Timer Interrupt Enable */
+#define RX8581_CTRL_AIE         0x08 /* Alarm Interrupt Enable */
+#define RX8581_CTRL_STOP        0x02 /* STOP bit */
+#define RX8581_CTRL_RESET       0x01 /* RESET bit */
+
+static struct i2c_driver rx8581_driver;
+
+/*
+ * In the routines that deal directly with the rx8581 hardware, we use
+ * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
+ */
+static int rx8581_get_datetime(struct i2c_client *client, struct rtc_time *tm)
+{
+        unsigned char date[7];
+        int data, err;
+
+        /* First we ensure that the "update flag" is not set, we read the
+         * time and date then re-read the "update flag". If the update flag
+         * has been set, we know that the time has changed during the read so
+         * we repeat the whole process again.
+         */
+        data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
+        if (data < 0) {
+                dev_err(&client->dev, "Unable to read device flags\n");
+                return -EIO;
+        }
+
+        do {
+                /* If update flag set, clear it */
+                if (data & RX8581_FLAG_UF) {
+                        err = i2c_smbus_write_byte_data(client,
+                                RX8581_REG_FLAG, (data & ~RX8581_FLAG_UF));
+                        if (err != 0) {
+                                dev_err(&client->dev, "Unable to write device "
+                                        "flags\n");
+                                return -EIO;
+                        }
+                }
+
+                /* Now read time and date */
+                err = i2c_smbus_read_i2c_block_data(client, RX8581_REG_SC,
+                        7, date);
+                if (err < 0) {
+                        dev_err(&client->dev, "Unable to read date\n");
+                        return -EIO;
+                }
+
+                /* Check flag register */
+                data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
+                if (data < 0) {
+                        dev_err(&client->dev, "Unable to read device flags\n");
+                        return -EIO;
+                }
+        } while (data & RX8581_FLAG_UF);
+
+        if (data & RX8581_FLAG_VLF)
+                dev_info(&client->dev,
+                        "low voltage detected, date/time is not reliable.\n");
+
+        dev_dbg(&client->dev,
+                "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
+                "wday=%02x, mday=%02x, mon=%02x, year=%02x\n",
+                __func__,
+                date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
+
+        tm->tm_sec = bcd2bin(date[RX8581_REG_SC] & 0x7F);
+        tm->tm_min = bcd2bin(date[RX8581_REG_MN] & 0x7F);
+        tm->tm_hour = bcd2bin(date[RX8581_REG_HR] & 0x3F); /* rtc hr 0-23 */
+        tm->tm_wday = ilog2(date[RX8581_REG_DW] & 0x7F);
+        tm->tm_mday = bcd2bin(date[RX8581_REG_DM] & 0x3F);
+        tm->tm_mon = bcd2bin(date[RX8581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
+        tm->tm_year = bcd2bin(date[RX8581_REG_YR]);
+        if (tm->tm_year < 70)
+                tm->tm_year += 100;     /* assume we are in 1970...2069 */
+
+
+        dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
+                "mday=%d, mon=%d, year=%d, wday=%d\n",
+                __func__,
+                tm->tm_sec, tm->tm_min, tm->tm_hour,
+                tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+        err = rtc_valid_tm(tm);
+        if (err < 0)
+                dev_err(&client->dev, "retrieved date/time is not valid.\n");
+
+        return err;
+}
+
+static int rx8581_set_datetime(struct i2c_client *client, struct rtc_time *tm)
+{
+        int data, err;
+        unsigned char buf[7];
+
+        dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
+                "mday=%d, mon=%d, year=%d, wday=%d\n",
+                __func__,
+                tm->tm_sec, tm->tm_min, tm->tm_hour,
+                tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+        /* hours, minutes and seconds */
+        buf[RX8581_REG_SC] = bin2bcd(tm->tm_sec);
+        buf[RX8581_REG_MN] = bin2bcd(tm->tm_min);
+        buf[RX8581_REG_HR] = bin2bcd(tm->tm_hour);
+
+        buf[RX8581_REG_DM] = bin2bcd(tm->tm_mday);
+
+        /* month, 1 - 12 */
+        buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1);
+
+        /* year and century */
+        buf[RX8581_REG_YR] = bin2bcd(tm->tm_year % 100);
+        buf[RX8581_REG_DW] = (0x1 << tm->tm_wday);
+
+        /* Stop the clock */
+        data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
+        if (data < 0) {
+                dev_err(&client->dev, "Unable to read control register\n");
+                return -EIO;
+        }
+
+        err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG,
+                (data | RX8581_CTRL_STOP));
+        if (err < 0) {
+                dev_err(&client->dev, "Unable to write control register\n");
+                return -EIO;
+        }
+
+        /* write register's data */
+        err = i2c_smbus_write_i2c_block_data(client, RX8581_REG_SC, 7, buf);
+        if (err < 0) {
+                dev_err(&client->dev, "Unable to write to date registers\n");
+                return -EIO;
+        }
+
+        /* Restart the clock */
+        data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
+        if (data < 0) {
+                dev_err(&client->dev, "Unable to read control register\n");
+                return -EIO;
+        }
+
+        err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG,
+                (data | ~(RX8581_CTRL_STOP)));
+        if (err != 0) {
+                dev_err(&client->dev, "Unable to write control register\n");
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+        return rx8581_get_datetime(to_i2c_client(dev), tm);
+}
+
+static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+        return rx8581_set_datetime(to_i2c_client(dev), tm);
+}
+
+static const struct rtc_class_ops rx8581_rtc_ops = {
+        .read_time      = rx8581_rtc_read_time,
+        .set_time       = rx8581_rtc_set_time,
+};
+
+static int __devinit rx8581_probe(struct i2c_client *client,
+                                const struct i2c_device_id *id)
+{
+        struct rtc_device *rtc;
+
+        dev_dbg(&client->dev, "%s\n", __func__);
+
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+                return -ENODEV;
+
+        dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
+
+        rtc = rtc_device_register(rx8581_driver.driver.name,
+                                &client->dev, &rx8581_rtc_ops, THIS_MODULE);
+
+        if (IS_ERR(rtc))
+                return PTR_ERR(rtc);
+
+        i2c_set_clientdata(client, rtc);
+
+        return 0;
+}
+
+static int __devexit rx8581_remove(struct i2c_client *client)
+{
+        struct rtc_device *rtc = i2c_get_clientdata(client);
+
+        rtc_device_unregister(rtc);
+
+        return 0;
+}
+
+static const struct i2c_device_id rx8581_id[] = {
+        { "rx8581", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, rx8581_id);
+
+static struct i2c_driver rx8581_driver = {
+        .driver         = {
+                .name   = "rtc-rx8581",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = rx8581_probe,
+        .remove         = __devexit_p(rx8581_remove),
+        .id_table       = rx8581_id,
+};
+
+static int __init rx8581_init(void)
+{
+        return i2c_add_driver(&rx8581_driver);
+}
+
+static void __exit rx8581_exit(void)
+{
+        i2c_del_driver(&rx8581_driver);
+}
+
+MODULE_AUTHOR("Martyn Welch <martyn.welch@gefanuc.com>");
+MODULE_DESCRIPTION("Epson RX-8581 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(rx8581_init);
+module_exit(rx8581_exit);
diff --git a/drivers/rtc/rtc-wm8350.c b/drivers/rtc/rtc-wm8350.c
new file mode 100644
index 000000000000..5c5e3aa91385
--- /dev/null
+++ b/drivers/rtc/rtc-wm8350.c
@@ -0,0 +1,514 @@
+/*
+ *      Real Time Clock driver for Wolfson Microelectronics WM8350
+ *
+ *      Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
+ *
+ *  Author: Liam Girdwood
+ *          linux@wolfsonmicro.com
+ *
+ *  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
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/interrupt.h>
+#include <linux/ioctl.h>
+#include <linux/completion.h>
+#include <linux/mfd/wm8350/rtc.h>
+#include <linux/mfd/wm8350/core.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#define WM8350_SET_ALM_RETRIES  5
+#define WM8350_SET_TIME_RETRIES 5
+#define WM8350_GET_TIME_RETRIES 5
+
+#define to_wm8350_from_rtc_dev(d) container_of(d, struct wm8350, rtc.pdev.dev)
+
+/*
+ * Read current time and date in RTC
+ */
+static int wm8350_rtc_readtime(struct device *dev, struct rtc_time *tm)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(dev);
+        u16 time1[4], time2[4];
+        int retries = WM8350_GET_TIME_RETRIES, ret;
+
+        /*
+         * Read the time twice and compare.
+         * If time1 == time2, then time is valid else retry.
+         */
+        do {
+                ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
+                                        4, time1);
+                if (ret < 0)
+                        return ret;
+                ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
+                                        4, time2);
+                if (ret < 0)
+                        return ret;
+
+                if (memcmp(time1, time2, sizeof(time1)) == 0) {
+                        tm->tm_sec = time1[0] & WM8350_RTC_SECS_MASK;
+
+                        tm->tm_min = (time1[0] & WM8350_RTC_MINS_MASK)
+                            >> WM8350_RTC_MINS_SHIFT;
+
+                        tm->tm_hour = time1[1] & WM8350_RTC_HRS_MASK;
+
+                        tm->tm_wday = ((time1[1] >> WM8350_RTC_DAY_SHIFT)
+                                       & 0x7) - 1;
+
+                        tm->tm_mon = ((time1[2] & WM8350_RTC_MTH_MASK)
+                                      >> WM8350_RTC_MTH_SHIFT) - 1;
+
+                        tm->tm_mday = (time1[2] & WM8350_RTC_DATE_MASK);
+
+                        tm->tm_year = ((time1[3] & WM8350_RTC_YHUNDREDS_MASK)
+                                       >> WM8350_RTC_YHUNDREDS_SHIFT) * 100;
+                        tm->tm_year += time1[3] & WM8350_RTC_YUNITS_MASK;
+
+                        tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
+                                                    tm->tm_year);
+                        tm->tm_year -= 1900;
+
+                        dev_dbg(dev, "Read (%d left): %04x %04x %04x %04x\n",
+                                retries,
+                                time1[0], time1[1], time1[2], time1[3]);
+
+                        return 0;
+                }
+        } while (retries--);
+
+        dev_err(dev, "timed out reading RTC time\n");
+        return -EIO;
+}
+
+/*
+ * Set current time and date in RTC
+ */
+static int wm8350_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(dev);
+        u16 time[4];
+        u16 rtc_ctrl;
+        int ret, retries = WM8350_SET_TIME_RETRIES;
+
+        time[0] = tm->tm_sec;
+        time[0] |= tm->tm_min << WM8350_RTC_MINS_SHIFT;
+        time[1] = tm->tm_hour;
+        time[1] |= (tm->tm_wday + 1) << WM8350_RTC_DAY_SHIFT;
+        time[2] = tm->tm_mday;
+        time[2] |= (tm->tm_mon + 1) << WM8350_RTC_MTH_SHIFT;
+        time[3] = ((tm->tm_year + 1900) / 100) << WM8350_RTC_YHUNDREDS_SHIFT;
+        time[3] |= (tm->tm_year + 1900) % 100;
+
+        dev_dbg(dev, "Setting: %04x %04x %04x %04x\n",
+                time[0], time[1], time[2], time[3]);
+
+        /* Set RTC_SET to stop the clock */
+        ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET);
+        if (ret < 0)
+                return ret;
+
+        /* Wait until confirmation of stopping */
+        do {
+                rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
+                schedule_timeout_uninterruptible(msecs_to_jiffies(1));
+        } while (retries-- && !(rtc_ctrl & WM8350_RTC_STS));
+
+        if (!retries) {
+                dev_err(dev, "timed out on set confirmation\n");
+                return -EIO;
+        }
+
+        /* Write time to RTC */
+        ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time);
+        if (ret < 0)
+                return ret;
+
+        /* Clear RTC_SET to start the clock */
+        ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
+                                WM8350_RTC_SET);
+        return ret;
+}
+
+/*
+ * Read alarm time and date in RTC
+ */
+static int wm8350_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(dev);
+        struct rtc_time *tm = &alrm->time;
+        u16 time[4];
+        int ret;
+
+        ret = wm8350_block_read(wm8350, WM8350_ALARM_SECONDS_MINUTES, 4, time);
+        if (ret < 0)
+                return ret;
+
+        tm->tm_sec = time[0] & WM8350_RTC_ALMSECS_MASK;
+        if (tm->tm_sec == WM8350_RTC_ALMSECS_MASK)
+                tm->tm_sec = -1;
+
+        tm->tm_min = time[0] & WM8350_RTC_ALMMINS_MASK;
+        if (tm->tm_min == WM8350_RTC_ALMMINS_MASK)
+                tm->tm_min = -1;
+        else
+                tm->tm_min >>= WM8350_RTC_ALMMINS_SHIFT;
+
+        tm->tm_hour = time[1] & WM8350_RTC_ALMHRS_MASK;
+        if (tm->tm_hour == WM8350_RTC_ALMHRS_MASK)
+                tm->tm_hour = -1;
+
+        tm->tm_wday = ((time[1] >> WM8350_RTC_ALMDAY_SHIFT) & 0x7) - 1;
+        if (tm->tm_wday > 7)
+                tm->tm_wday = -1;
+
+        tm->tm_mon = time[2] & WM8350_RTC_ALMMTH_MASK;
+        if (tm->tm_mon == WM8350_RTC_ALMMTH_MASK)
+                tm->tm_mon = -1;
+        else
+                tm->tm_mon = (tm->tm_mon >> WM8350_RTC_ALMMTH_SHIFT) - 1;
+
+        tm->tm_mday = (time[2] & WM8350_RTC_ALMDATE_MASK);
+        if (tm->tm_mday == WM8350_RTC_ALMDATE_MASK)
+                tm->tm_mday = -1;
+
+        tm->tm_year = -1;
+
+        alrm->enabled = !(time[3] & WM8350_RTC_ALMSTS);
+
+        return 0;
+}
+
+static int wm8350_rtc_stop_alarm(struct wm8350 *wm8350)
+{
+        int retries = WM8350_SET_ALM_RETRIES;
+        u16 rtc_ctrl;
+        int ret;
+
+        /* Set RTC_SET to stop the clock */
+        ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
+                              WM8350_RTC_ALMSET);
+        if (ret < 0)
+                return ret;
+
+        /* Wait until confirmation of stopping */
+        do {
+                rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
+                schedule_timeout_uninterruptible(msecs_to_jiffies(1));
+        } while (retries-- && !(rtc_ctrl & WM8350_RTC_ALMSTS));
+
+        if (!(rtc_ctrl & WM8350_RTC_ALMSTS))
+                return -ETIMEDOUT;
+
+        return 0;
+}
+
+static int wm8350_rtc_start_alarm(struct wm8350 *wm8350)
+{
+        int ret;
+        int retries = WM8350_SET_ALM_RETRIES;
+        u16 rtc_ctrl;
+
+        ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
+                                WM8350_RTC_ALMSET);
+        if (ret < 0)
+                return ret;
+
+        /* Wait until confirmation */
+        do {
+                rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
+                schedule_timeout_uninterruptible(msecs_to_jiffies(1));
+        } while (retries-- && rtc_ctrl & WM8350_RTC_ALMSTS);
+
+        if (rtc_ctrl & WM8350_RTC_ALMSTS)
+                return -ETIMEDOUT;
+
+        return 0;
+}
+
+static int wm8350_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(dev);
+        struct rtc_time *tm = &alrm->time;
+        u16 time[3];
+        int ret;
+
+        memset(time, 0, sizeof(time));
+
+        if (tm->tm_sec != -1)
+                time[0] |= tm->tm_sec;
+        else
+                time[0] |= WM8350_RTC_ALMSECS_MASK;
+
+        if (tm->tm_min != -1)
+                time[0] |= tm->tm_min << WM8350_RTC_ALMMINS_SHIFT;
+        else
+                time[0] |= WM8350_RTC_ALMMINS_MASK;
+
+        if (tm->tm_hour != -1)
+                time[1] |= tm->tm_hour;
+        else
+                time[1] |= WM8350_RTC_ALMHRS_MASK;
+
+        if (tm->tm_wday != -1)
+                time[1] |= (tm->tm_wday + 1) << WM8350_RTC_ALMDAY_SHIFT;
+        else
+                time[1] |= WM8350_RTC_ALMDAY_MASK;
+
+        if (tm->tm_mday != -1)
+                time[2] |= tm->tm_mday;
+        else
+                time[2] |= WM8350_RTC_ALMDATE_MASK;
+
+        if (tm->tm_mon != -1)
+                time[2] |= (tm->tm_mon + 1) << WM8350_RTC_ALMMTH_SHIFT;
+        else
+                time[2] |= WM8350_RTC_ALMMTH_MASK;
+
+        ret = wm8350_rtc_stop_alarm(wm8350);
+        if (ret < 0)
+                return ret;
+
+        /* Write time to RTC */
+        ret = wm8350_block_write(wm8350, WM8350_ALARM_SECONDS_MINUTES,
+                                 3, time);
+        if (ret < 0)
+                return ret;
+
+        if (alrm->enabled)
+                ret = wm8350_rtc_start_alarm(wm8350);
+
+        return ret;
+}
+
+/*
+ * Handle commands from user-space
+ */
+static int wm8350_rtc_ioctl(struct device *dev, unsigned int cmd,
+                            unsigned long arg)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(dev);
+
+        switch (cmd) {
+        case RTC_AIE_OFF:
+                return wm8350_rtc_stop_alarm(wm8350);
+        case RTC_AIE_ON:
+                return wm8350_rtc_start_alarm(wm8350);
+
+        case RTC_UIE_OFF:
+                wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);
+                break;
+        case RTC_UIE_ON:
+                wm8350_unmask_irq(wm8350, WM8350_IRQ_RTC_SEC);
+                break;
+
+        default:
+                return -ENOIOCTLCMD;
+        }
+
+        return 0;
+}
+
+static void wm8350_rtc_alarm_handler(struct wm8350 *wm8350, int irq,
+                                     void *data)
+{
+        struct rtc_device *rtc = wm8350->rtc.rtc;
+        int ret;
+
+        rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+
+        /* Make it one shot */
+        ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
+                              WM8350_RTC_ALMSET);
+        if (ret != 0) {
+                dev_err(&(wm8350->rtc.pdev->dev),
+                        "Failed to disable alarm: %d\n", ret);
+        }
+}
+
+static void wm8350_rtc_update_handler(struct wm8350 *wm8350, int irq,
+                                      void *data)
+{
+        struct rtc_device *rtc = wm8350->rtc.rtc;
+
+        rtc_update_irq(rtc, 1, RTC_IRQF | RTC_UF);
+}
+
+static const struct rtc_class_ops wm8350_rtc_ops = {
+        .ioctl = wm8350_rtc_ioctl,
+        .read_time = wm8350_rtc_readtime,
+        .set_time = wm8350_rtc_settime,
+        .read_alarm = wm8350_rtc_readalarm,
+        .set_alarm = wm8350_rtc_setalarm,
+};
+
+#ifdef CONFIG_PM
+static int wm8350_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(&pdev->dev);
+        int ret = 0;
+        u16 reg;
+
+        reg = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
+
+        if (device_may_wakeup(&wm8350->rtc.pdev->dev) &&
+            reg & WM8350_RTC_ALMSTS) {
+                ret = wm8350_rtc_stop_alarm(wm8350);
+                if (ret != 0)
+                        dev_err(&pdev->dev, "Failed to stop RTC alarm: %d\n",
+                                ret);
+        }
+
+        return ret;
+}
+
+static int wm8350_rtc_resume(struct platform_device *pdev)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(&pdev->dev);
+        int ret;
+
+        if (wm8350->rtc.alarm_enabled) {
+                ret = wm8350_rtc_start_alarm(wm8350);
+                if (ret != 0)
+                        dev_err(&pdev->dev,
+                                "Failed to restart RTC alarm: %d\n", ret);
+        }
+
+        return 0;
+}
+
+#else
+#define wm8350_rtc_suspend NULL
+#define wm8350_rtc_resume NULL
+#endif
+
+static int wm8350_rtc_probe(struct platform_device *pdev)
+{
+        struct wm8350 *wm8350 = platform_get_drvdata(pdev);
+        struct wm8350_rtc *wm_rtc = &wm8350->rtc;
+        int ret = 0;
+        u16 timectl, power5;
+
+        timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
+        if (timectl & WM8350_RTC_BCD) {
+                dev_err(&pdev->dev, "RTC BCD mode not supported\n");
+                return -EINVAL;
+        }
+        if (timectl & WM8350_RTC_12HR) {
+                dev_err(&pdev->dev, "RTC 12 hour mode not supported\n");
+                return -EINVAL;
+        }
+
+        /* enable the RTC if it's not already enabled */
+        power5 = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
+        if (!(power5 &  WM8350_RTC_TICK_ENA)) {
+                dev_info(wm8350->dev, "Starting RTC\n");
+
+                wm8350_reg_unlock(wm8350);
+
+                ret = wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5,
+                                      WM8350_RTC_TICK_ENA);
+                if (ret < 0) {
+                        dev_err(&pdev->dev, "failed to enable RTC: %d\n", ret);
+                        return ret;
+                }
+
+                wm8350_reg_lock(wm8350);
+        }
+
+        if (timectl & WM8350_RTC_STS) {
+                int retries;
+
+                ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
+                                        WM8350_RTC_SET);
+                if (ret < 0) {
+                        dev_err(&pdev->dev, "failed to start: %d\n", ret);
+                        return ret;
+                }
+
+                retries = WM8350_SET_TIME_RETRIES;
+                do {
+                        timectl = wm8350_reg_read(wm8350,
+                                                  WM8350_RTC_TIME_CONTROL);
+                } while (timectl & WM8350_RTC_STS && retries--);
+
+                if (retries == 0) {
+                        dev_err(&pdev->dev, "failed to start: timeout\n");
+                        return -ENODEV;
+                }
+        }
+
+        device_init_wakeup(&pdev->dev, 1);
+
+        wm_rtc->rtc = rtc_device_register("wm8350", &pdev->dev,
+                                          &wm8350_rtc_ops, THIS_MODULE);
+        if (IS_ERR(wm_rtc->rtc)) {
+                ret = PTR_ERR(wm_rtc->rtc);
+                dev_err(&pdev->dev, "failed to register RTC: %d\n", ret);
+                return ret;
+        }
+
+        wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);
+        wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_PER);
+
+        wm8350_register_irq(wm8350, WM8350_IRQ_RTC_SEC,
+                            wm8350_rtc_update_handler, NULL);
+
+        wm8350_register_irq(wm8350, WM8350_IRQ_RTC_ALM,
+                            wm8350_rtc_alarm_handler, NULL);
+        wm8350_unmask_irq(wm8350, WM8350_IRQ_RTC_ALM);
+
+        return 0;
+}
+
+static int __devexit wm8350_rtc_remove(struct platform_device *pdev)
+{
+        struct wm8350 *wm8350 = platform_get_drvdata(pdev);
+        struct wm8350_rtc *wm_rtc = &wm8350->rtc;
+
+        wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);
+
+        wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC);
+        wm8350_free_irq(wm8350, WM8350_IRQ_RTC_ALM);
+
+        rtc_device_unregister(wm_rtc->rtc);
+
+        return 0;
+}
+
+static struct platform_driver wm8350_rtc_driver = {
+        .probe = wm8350_rtc_probe,
+        .remove = __devexit_p(wm8350_rtc_remove),
+        .suspend = wm8350_rtc_suspend,
+        .resume = wm8350_rtc_resume,
+        .driver = {
+                .name = "wm8350-rtc",
+        },
+};
+
+static int __init wm8350_rtc_init(void)
+{
+        return platform_driver_register(&wm8350_rtc_driver);
+}
+module_init(wm8350_rtc_init);
+
+static void __exit wm8350_rtc_exit(void)
+{
+        platform_driver_unregister(&wm8350_rtc_driver);
+}
+module_exit(wm8350_rtc_exit);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("RTC driver for the WM8350");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8350-rtc");