add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-ds3232.c
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@@ -1,14 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock
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  *
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  * Copyright (C) 2009-2011 Freescale Semiconductor.
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  * Author: Jack Lan <jack.lan@freescale.com>
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  * Copyright (C) 2008 MIMOMax Wireless Ltd.
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- *
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- * This program is free software; you can redistribute  it and/or modify it
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- * under  the terms of  the GNU General  Public License as published by the
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- * Free Software Foundation;  either version 2 of the  License, or (at your
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- * option) any later version.
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  */
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@@ -48,6 +44,10 @@
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 #       define DS3232_REG_SR_A1F     0x01
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 #define DS3232_REG_TEMPERATURE	0x11
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+#define DS3232_REG_SRAM_START   0x14
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+#define DS3232_REG_SRAM_END     0xFF
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+
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+#define DS3232_REG_SRAM_SIZE    236
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 struct ds3232 {
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 	struct device *dev;
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@@ -461,11 +461,39 @@
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 	.alarm_irq_enable = ds3232_alarm_irq_enable,
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 };
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+static int ds3232_nvmem_read(void *priv, unsigned int offset, void *val,
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+			     size_t bytes)
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+{
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+	struct regmap *ds3232_regmap = (struct regmap *)priv;
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+
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+	return regmap_bulk_read(ds3232_regmap, DS3232_REG_SRAM_START + offset,
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+				val, bytes);
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+}
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+
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+static int ds3232_nvmem_write(void *priv, unsigned int offset, void *val,
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+			      size_t bytes)
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+{
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+	struct regmap *ds3232_regmap = (struct regmap *)priv;
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+
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+	return regmap_bulk_write(ds3232_regmap, DS3232_REG_SRAM_START + offset,
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+				 val, bytes);
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+}
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+
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 static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
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 			const char *name)
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 {
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 	struct ds3232 *ds3232;
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 	int ret;
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+	struct nvmem_config nvmem_cfg = {
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+		.name = "ds3232_sram",
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+		.stride = 1,
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+		.size = DS3232_REG_SRAM_SIZE,
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+		.word_size = 1,
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+		.reg_read = ds3232_nvmem_read,
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+		.reg_write = ds3232_nvmem_write,
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+		.priv = regmap,
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+		.type = NVMEM_TYPE_BATTERY_BACKED
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+	};
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 	ds3232 = devm_kzalloc(dev, sizeof(*ds3232), GFP_KERNEL);
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 	if (!ds3232)
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@@ -489,6 +517,10 @@
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 						THIS_MODULE);
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 	if (IS_ERR(ds3232->rtc))
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 		return PTR_ERR(ds3232->rtc);
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+
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+	ret = rtc_nvmem_register(ds3232->rtc, &nvmem_cfg);
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+	if(ret)
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+		return ret;
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 	if (ds3232->irq > 0) {
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 		ret = devm_request_threaded_irq(dev, ds3232->irq, NULL,
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@@ -542,7 +574,7 @@
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 	static const struct regmap_config config = {
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 		.reg_bits = 8,
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 		.val_bits = 8,
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-		.max_register = 0x13,
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+		.max_register = DS3232_REG_SRAM_END,
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 	};
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 	regmap = devm_regmap_init_i2c(client, &config);
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@@ -609,7 +641,7 @@
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 	static const struct regmap_config config = {
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 		.reg_bits = 8,
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 		.val_bits = 8,
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-		.max_register = 0x13,
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+		.max_register = DS3232_REG_SRAM_END,
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 		.write_flag_mask = 0x80,
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 	};
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 	struct regmap *regmap;