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>

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");