add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-pcf85363.c
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@@ -1,15 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * drivers/rtc/rtc-pcf85363.c
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  *
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  * Driver for NXP PCF85363 real-time clock.
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  *
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  * Copyright (C) 2017 Eric Nelson
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * Based loosely on rtc-8583 by Russell King, Wolfram Sang and Juergen Beisert
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  */
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 #include <linux/module.h>
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 #include <linux/i2c.h>
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@@ -112,12 +107,14 @@
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107
 
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 #define NVRAM_SIZE	0x40
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109
 
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-static struct i2c_driver pcf85363_driver;
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-
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 struct pcf85363 {
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-	struct device		*dev;
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 	struct rtc_device	*rtc;
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 	struct regmap		*regmap;
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+};
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+
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+struct pcf85x63_config {
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+	struct regmap_config regmap;
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+	unsigned int num_nvram;
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 };
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 static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm)
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@@ -316,54 +313,102 @@
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 				 val, bytes);
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 }
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-static const struct regmap_config regmap_config = {
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-	.reg_bits = 8,
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-	.val_bits = 8,
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-	.max_register = 0x7f,
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+static int pcf85x63_nvram_read(void *priv, unsigned int offset, void *val,
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+			       size_t bytes)
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+{
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+	struct pcf85363 *pcf85363 = priv;
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+	unsigned int tmp_val;
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+	int ret;
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+
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+	ret = regmap_read(pcf85363->regmap, CTRL_RAMBYTE, &tmp_val);
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+	(*(unsigned char *) val) = (unsigned char) tmp_val;
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+
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+	return ret;
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+}
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+
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+static int pcf85x63_nvram_write(void *priv, unsigned int offset, void *val,
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+				size_t bytes)
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+{
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+	struct pcf85363 *pcf85363 = priv;
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+	unsigned char tmp_val;
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+
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+	tmp_val = *((unsigned char *)val);
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+	return regmap_write(pcf85363->regmap, CTRL_RAMBYTE,
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+				(unsigned int)tmp_val);
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+}
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+
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+static const struct pcf85x63_config pcf_85263_config = {
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+	.regmap = {
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+		.reg_bits = 8,
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+		.val_bits = 8,
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+		.max_register = 0x2f,
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+	},
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+	.num_nvram = 1
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+};
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+
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+static const struct pcf85x63_config pcf_85363_config = {
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+	.regmap = {
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+		.reg_bits = 8,
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+		.val_bits = 8,
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+		.max_register = 0x7f,
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+	},
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+	.num_nvram = 2
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 };
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 static int pcf85363_probe(struct i2c_client *client,
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 			  const struct i2c_device_id *id)
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 {
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 	struct pcf85363 *pcf85363;
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-	struct nvmem_config nvmem_cfg = {
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-		.name = "pcf85363-",
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-		.word_size = 1,
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-		.stride = 1,
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-		.size = NVRAM_SIZE,
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-		.reg_read = pcf85363_nvram_read,
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-		.reg_write = pcf85363_nvram_write,
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+	const struct pcf85x63_config *config = &pcf_85363_config;
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+	const void *data = of_device_get_match_data(&client->dev);
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+	static struct nvmem_config nvmem_cfg[] = {
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+		{
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+			.name = "pcf85x63-",
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+			.word_size = 1,
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+			.stride = 1,
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+			.size = 1,
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+			.reg_read = pcf85x63_nvram_read,
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+			.reg_write = pcf85x63_nvram_write,
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+		}, {
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+			.name = "pcf85363-",
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+			.word_size = 1,
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+			.stride = 1,
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+			.size = NVRAM_SIZE,
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+			.reg_read = pcf85363_nvram_read,
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+			.reg_write = pcf85363_nvram_write,
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+		},
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 	};
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-	int ret;
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+	int ret, i;
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-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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-		return -ENODEV;
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+	if (data)
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+		config = data;
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 	pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363),
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 				GFP_KERNEL);
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 	if (!pcf85363)
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 		return -ENOMEM;
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-	pcf85363->regmap = devm_regmap_init_i2c(client, &regmap_config);
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+	pcf85363->regmap = devm_regmap_init_i2c(client, &config->regmap);
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 	if (IS_ERR(pcf85363->regmap)) {
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 		dev_err(&client->dev, "regmap allocation failed\n");
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 		return PTR_ERR(pcf85363->regmap);
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 	}
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-	pcf85363->dev = &client->dev;
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 	i2c_set_clientdata(client, pcf85363);
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-	pcf85363->rtc = devm_rtc_allocate_device(pcf85363->dev);
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+	pcf85363->rtc = devm_rtc_allocate_device(&client->dev);
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 	if (IS_ERR(pcf85363->rtc))
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 		return PTR_ERR(pcf85363->rtc);
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 	pcf85363->rtc->ops = &rtc_ops;
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+	pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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+	pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099;
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 	if (client->irq > 0) {
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 		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
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 		regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
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 				   PIN_IO_INTA_OUT, PIN_IO_INTAPM);
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-		ret = devm_request_threaded_irq(pcf85363->dev, client->irq,
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+		ret = devm_request_threaded_irq(&client->dev, client->irq,
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 						NULL, pcf85363_rtc_handle_irq,
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 						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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 						"pcf85363", client);
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@@ -375,15 +420,18 @@
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 	ret = rtc_register_device(pcf85363->rtc);
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-	nvmem_cfg.priv = pcf85363;
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-	rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg);
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+	for (i = 0; i < config->num_nvram; i++) {
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+		nvmem_cfg[i].priv = pcf85363;
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+		rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg[i]);
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+	}
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 	return ret;
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 }
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 static const struct of_device_id dev_ids[] = {
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-	{ .compatible = "nxp,pcf85363" },
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-	{}
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+	{ .compatible = "nxp,pcf85263", .data = &pcf_85263_config },
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+	{ .compatible = "nxp,pcf85363", .data = &pcf_85363_config },
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+	{ /* sentinel */ }
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 };
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 MODULE_DEVICE_TABLE(of, dev_ids);
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@@ -398,5 +446,5 @@
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 module_i2c_driver(pcf85363_driver);
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 MODULE_AUTHOR("Eric Nelson");
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-MODULE_DESCRIPTION("pcf85363 I2C RTC driver");
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+MODULE_DESCRIPTION("pcf85263/pcf85363 I2C RTC driver");
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 MODULE_LICENSE("GPL");