write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/rtc/rtc-rv8803.c
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@@ -1,13 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * RTC driver for the Micro Crystal RV8803
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  *
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  * Copyright (C) 2015 Micro Crystal SA
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- *
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- * Alexandre Belloni <alexandre.belloni@free-electrons.com>
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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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+ * Alexandre Belloni <alexandre.belloni@bootlin.com>
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  *
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  */
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@@ -236,9 +232,6 @@
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 	u8 date[7];
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 	int ctrl, flags, ret;
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-	if ((tm->tm_year < 100) || (tm->tm_year > 199))
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-		return -EINVAL;
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-
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 	ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
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 	if (ctrl < 0)
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 		return ctrl;
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@@ -418,6 +411,7 @@
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 {
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 	struct i2c_client *client = to_i2c_client(dev);
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 	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
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+	unsigned int vl = 0;
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 	int flags, ret = 0;
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 	switch (cmd) {
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@@ -426,18 +420,15 @@
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 		if (flags < 0)
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 			return flags;
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-		if (flags & RV8803_FLAG_V1F)
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+		if (flags & RV8803_FLAG_V1F) {
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 			dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
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+			vl = RTC_VL_ACCURACY_LOW;
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+		}
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 		if (flags & RV8803_FLAG_V2F)
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-			dev_warn(&client->dev, "Voltage low, data loss detected.\n");
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+			vl |= RTC_VL_DATA_INVALID;
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-		flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F;
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-
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-		if (copy_to_user((void __user *)arg, &flags, sizeof(int)))
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-			return -EFAULT;
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-
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-		return 0;
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+		return put_user(vl, (unsigned int __user *)arg);
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 	case RTC_VL_CLR:
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 		mutex_lock(&rv8803->flags_lock);
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@@ -447,7 +438,7 @@
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 			return flags;
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 		}
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-		flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F);
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+		flags &= ~RV8803_FLAG_V1F;
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 		ret = rv8803_write_reg(client, RV8803_FLAG, flags);
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 		mutex_unlock(&rv8803->flags_lock);
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 		if (ret)
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@@ -463,13 +454,7 @@
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 static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,
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 			      size_t bytes)
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 {
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-	int ret;
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-
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-	ret = rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
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-	if (ret)
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-		return ret;
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-
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-	return 0;
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+	return rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
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 }
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 static int rv8803_nvram_read(void *priv, unsigned int offset,
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@@ -524,7 +509,7 @@
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 static int rv8803_probe(struct i2c_client *client,
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 			const struct i2c_device_id *id)
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 {
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-	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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+	struct i2c_adapter *adapter = client->adapter;
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 	struct rv8803_data *rv8803;
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 	int err, flags;
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 	struct nvmem_config nvmem_cfg = {
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@@ -571,9 +556,8 @@
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 		dev_warn(&client->dev, "An alarm maybe have been missed.\n");
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 	rv8803->rtc = devm_rtc_allocate_device(&client->dev);
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-	if (IS_ERR(rv8803->rtc)) {
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+	if (IS_ERR(rv8803->rtc))
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 		return PTR_ERR(rv8803->rtc);
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-	}
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 	if (client->irq > 0) {
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 		err = devm_request_threaded_irq(&client->dev, client->irq,
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@@ -602,6 +586,8 @@
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 	rv8803->rtc->ops = &rv8803_rtc_ops;
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 	rv8803->rtc->nvram_old_abi = true;
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+	rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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+	rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099;
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 	err = rtc_register_device(rv8803->rtc);
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 	if (err)
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 		return err;
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@@ -615,6 +601,7 @@
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 static const struct i2c_device_id rv8803_id[] = {
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 	{ "rv8803", rv_8803 },
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+	{ "rx8803", rv_8803 },
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 	{ "rx8900", rx_8900 },
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 	{ }
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 };
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@@ -623,6 +610,10 @@
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 static const struct of_device_id rv8803_of_match[] = {
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 	{
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 		.compatible = "microcrystal,rv8803",
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+		.data = (void *)rv_8803
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+	},
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+	{
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+		.compatible = "epson,rx8803",
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 		.data = (void *)rv_8803
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 	},
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 	{
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@@ -643,6 +634,6 @@
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 };
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 module_i2c_driver(rv8803_driver);
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-MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
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+MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
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 MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
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 MODULE_LICENSE("GPL v2");