1 files changed, 160 insertions, 112 deletions

diff --git a/drivers/rtc/rtc-rx8581.c b/drivers/rtc/rtc-rx8581.c
index 00b0eb7fe166..20c2dff01bae 100644
--- a/drivers/rtc/rtc-rx8581.c
+++ b/drivers/rtc/rtc-rx8581.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * An I2C driver for the Epson RX8581 RTC
  *
  * Author: Martyn Welch <martyn.welch@ge.com>
  * Copyright 2008 GE 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
  */
@@ -15,11 +12,11 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/bcd.h>
+#include <linux/of.h>
+#include <linux/regmap.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 */
@@ -52,62 +49,63 @@
 #define RX8581_CTRL_STOP	0x02 /* STOP bit */
 #define RX8581_CTRL_RESET	0x01 /* RESET bit */
 
-static struct i2c_driver rx8581_driver;
+#define RX8571_USER_RAM		0x10
+#define RX8571_NVRAM_SIZE	0x10
+
+struct rx85x1_config {
+	struct regmap_config regmap;
+	unsigned int num_nvram;
+};
 
 /*
  * 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)
+static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
+	struct i2c_client *client = to_i2c_client(dev);
 	unsigned char date[7];
-	int data, err;
+	unsigned int data;
+	int err;
+	struct regmap *regmap = i2c_get_clientdata(client);
 
 	/* 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;
+	err = regmap_read(regmap, RX8581_REG_FLAG, &data);
+	if (err < 0)
+		return err;
+
+	if (data & RX8581_FLAG_VLF) {
+		dev_warn(dev,
+			 "low voltage detected, date/time is not reliable.\n");
+		return -EINVAL;
 	}
 
 	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;
-			}
+			err = regmap_write(regmap, RX8581_REG_FLAG,
+					   data & ~RX8581_FLAG_UF);
+			if (err < 0)
+				return err;
 		}
 
 		/* 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;
-		}
+		err = regmap_bulk_read(regmap, RX8581_REG_SC, date,
+				       sizeof(date));
+		if (err < 0)
+			return err;
 
 		/* 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;
-		}
+		err = regmap_read(regmap, RX8581_REG_FLAG, &data);
+		if (err < 0)
+			return err;
 	} 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, "
+	dev_dbg(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]);
@@ -118,30 +116,25 @@ static int rx8581_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 	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 */
+	tm->tm_year = bcd2bin(date[RX8581_REG_YR]) + 100;
 
-
-	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
+	dev_dbg(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;
+	return 0;
 }
 
-static int rx8581_set_datetime(struct i2c_client *client, struct rtc_time *tm)
+static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
-	int data, err;
+	struct i2c_client *client = to_i2c_client(dev);
+	int err;
 	unsigned char buf[7];
+	struct regmap *regmap = i2c_get_clientdata(client);
 
-	dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
+	dev_dbg(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,
@@ -158,109 +151,165 @@ static int rx8581_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 	buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1);
 
 	/* year and century */
-	buf[RX8581_REG_YR] = bin2bcd(tm->tm_year % 100);
+	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_CTRL,
-		(data | RX8581_CTRL_STOP));
-	if (err < 0) {
-		dev_err(&client->dev, "Unable to write control register\n");
-		return -EIO;
-	}
+	err = regmap_update_bits(regmap, RX8581_REG_CTRL,
+				 RX8581_CTRL_STOP, RX8581_CTRL_STOP);
+	if (err < 0)
+		return err;
 
 	/* 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;
-	}
+	err = regmap_bulk_write(regmap, RX8581_REG_SC, buf, sizeof(buf));
+	if (err < 0)
+		return err;
 
 	/* get VLF and clear it */
-	data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
-	if (data < 0) {
-		dev_err(&client->dev, "Unable to read flag register\n");
-		return -EIO;
-	}
-
-	err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG,
-		(data & ~(RX8581_FLAG_VLF)));
-	if (err != 0) {
-		dev_err(&client->dev, "Unable to write flag register\n");
-		return -EIO;
-	}
+	err = regmap_update_bits(regmap, RX8581_REG_FLAG, RX8581_FLAG_VLF, 0);
+	if (err < 0)
+		return err;
 
 	/* 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;
-	}
+	return regmap_update_bits(regmap, RX8581_REG_CTRL,
+				 RX8581_CTRL_STOP, 0);
+}
 
-	err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
-		(data & ~(RX8581_CTRL_STOP)));
-	if (err != 0) {
-		dev_err(&client->dev, "Unable to write control register\n");
-		return -EIO;
-	}
+static const struct rtc_class_ops rx8581_rtc_ops = {
+	.read_time	= rx8581_rtc_read_time,
+	.set_time	= rx8581_rtc_set_time,
+};
 
-	return 0;
+static int rx8571_nvram_read(void *priv, unsigned int offset, void *val,
+			     size_t bytes)
+{
+	struct regmap *regmap = priv;
+
+	return regmap_bulk_read(regmap, RX8571_USER_RAM + offset, val, bytes);
 }
 
-static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
+static int rx8571_nvram_write(void *priv, unsigned int offset, void *val,
+			      size_t bytes)
 {
-	return rx8581_get_datetime(to_i2c_client(dev), tm);
+	struct regmap *regmap = priv;
+
+	return regmap_bulk_write(regmap, RX8571_USER_RAM + offset, val, bytes);
 }
 
-static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
+static int rx85x1_nvram_read(void *priv, unsigned int offset, void *val,
+			     size_t bytes)
 {
-	return rx8581_set_datetime(to_i2c_client(dev), tm);
+	struct regmap *regmap = priv;
+	unsigned int tmp_val;
+	int ret;
+
+	ret = regmap_read(regmap, RX8581_REG_RAM, &tmp_val);
+	(*(unsigned char *)val) = (unsigned char) tmp_val;
+
+	return ret;
 }
 
-static const struct rtc_class_ops rx8581_rtc_ops = {
-	.read_time	= rx8581_rtc_read_time,
-	.set_time	= rx8581_rtc_set_time,
+static int rx85x1_nvram_write(void *priv, unsigned int offset, void *val,
+			      size_t bytes)
+{
+	struct regmap *regmap = priv;
+	unsigned char tmp_val;
+
+	tmp_val = *((unsigned char *)val);
+	return regmap_write(regmap, RX8581_REG_RAM, (unsigned int)tmp_val);
+}
+
+static const struct rx85x1_config rx8581_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0xf,
+	},
+	.num_nvram = 1
+};
+
+static const struct rx85x1_config rx8571_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x1f,
+	},
+	.num_nvram = 2
 };
 
-static int rx8581_probe(struct i2c_client *client,
-			const struct i2c_device_id *id)
+static int rx8581_probe(struct i2c_client *client)
 {
+	struct regmap *regmap;
+	const struct rx85x1_config *config = &rx8581_config;
+	const void *data = of_device_get_match_data(&client->dev);
 	struct rtc_device *rtc;
+	static struct nvmem_config nvmem_cfg[] = {
+		{
+			.name = "rx85x1-",
+			.word_size = 1,
+			.stride = 1,
+			.size = 1,
+			.reg_read = rx85x1_nvram_read,
+			.reg_write = rx85x1_nvram_write,
+		}, {
+			.name = "rx8571-",
+			.word_size = 1,
+			.stride = 1,
+			.size = RX8571_NVRAM_SIZE,
+			.reg_read = rx8571_nvram_read,
+			.reg_write = rx8571_nvram_write,
+		},
+	};
+	int ret, i;
 
 	dev_dbg(&client->dev, "%s\n", __func__);
 
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
-		return -ENODEV;
+	if (data)
+		config = data;
 
-	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
+	regmap = devm_regmap_init_i2c(client, &config->regmap);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
 
-	rtc = devm_rtc_device_register(&client->dev, rx8581_driver.driver.name,
-					&rx8581_rtc_ops, THIS_MODULE);
+	i2c_set_clientdata(client, regmap);
 
+	rtc = devm_rtc_allocate_device(&client->dev);
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
 
-	i2c_set_clientdata(client, rtc);
+	rtc->ops = &rx8581_rtc_ops;
+	rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rtc->range_max = RTC_TIMESTAMP_END_2099;
+	rtc->start_secs = 0;
+	rtc->set_start_time = true;
 
-	return 0;
+	ret = devm_rtc_register_device(rtc);
+
+	for (i = 0; i < config->num_nvram; i++) {
+		nvmem_cfg[i].priv = regmap;
+		devm_rtc_nvmem_register(rtc, &nvmem_cfg[i]);
+	}
+
+	return ret;
 }
 
 static const struct i2c_device_id rx8581_id[] = {
-	{ "rx8581", 0 },
+	{ "rx8581" },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, rx8581_id);
 
+static const __maybe_unused struct of_device_id rx8581_of_match[] = {
+	{ .compatible = "epson,rx8571", .data = &rx8571_config },
+	{ .compatible = "epson,rx8581", .data = &rx8581_config },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rx8581_of_match);
+
 static struct i2c_driver rx8581_driver = {
 	.driver		= {
 		.name	= "rtc-rx8581",
-		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(rx8581_of_match),
 	},
 	.probe		= rx8581_probe,
 	.id_table	= rx8581_id,
@@ -269,6 +318,5 @@ static struct i2c_driver rx8581_driver = {
 module_i2c_driver(rx8581_driver);
 
 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
-MODULE_DESCRIPTION("Epson RX-8581 RTC driver");
+MODULE_DESCRIPTION("Epson RX-8571/RX-8581 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);