add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-m41t80.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * I2C client/driver for the ST M41T80 family of i2c rtc chips.
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  *
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@@ -6,11 +7,6 @@
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  * Based on m41t00.c by Mark A. Greer <mgreer@mvista.com>
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  *
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  * 2006 (c) mycable GmbH
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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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  */
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11
 
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@@ -217,7 +213,7 @@
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 					    sizeof(buf), buf);
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 	if (err < 0) {
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 		dev_err(&client->dev, "Unable to read date\n");
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-		return -EIO;
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+		return err;
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 	}
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 	tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f);
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@@ -238,9 +234,6 @@
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 	struct m41t80_data *clientdata = i2c_get_clientdata(client);
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 	unsigned char buf[8];
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 	int err, flags;
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-
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-	if (tm->tm_year < 100 || tm->tm_year > 199)
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-		return -EINVAL;
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 	buf[M41T80_REG_SSEC] = 0;
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 	buf[M41T80_REG_SEC] = bin2bcd(tm->tm_sec);
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@@ -274,10 +267,11 @@
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 	if (flags < 0)
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 		return flags;
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-	if (i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
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-				      flags & ~M41T80_FLAGS_OF)) {
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+	err = i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
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+					flags & ~M41T80_FLAGS_OF);
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+	if (err < 0) {
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 		dev_err(&client->dev, "Unable to write flags register\n");
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-		return -EIO;
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+		return err;
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 	}
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 	return err;
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@@ -287,10 +281,12 @@
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 {
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 	struct i2c_client *client = to_i2c_client(dev);
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 	struct m41t80_data *clientdata = i2c_get_clientdata(client);
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-	u8 reg;
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+	int reg;
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 	if (clientdata->features & M41T80_FEATURE_BL) {
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 		reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
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+		if (reg < 0)
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+			return reg;
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 		seq_printf(seq, "battery\t\t: %s\n",
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 			   (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok");
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 	}
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@@ -706,7 +702,6 @@
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 /**
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  *	wdt_ioctl:
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- *	@inode: inode of the device
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  *	@file: file handle to the device
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  *	@cmd: watchdog command
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  *	@arg: argument pointer
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@@ -745,7 +740,7 @@
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 			return -EINVAL;
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 		wdt_margin = new_margin;
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 		wdt_ping();
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-		/* Fall */
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+		fallthrough;
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 	case WDIOC_GETTIMEOUT:
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 		return put_user(wdt_margin, (int __user *)arg);
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746
 
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@@ -799,7 +794,7 @@
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 		 */
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 		wdt_is_open = 1;
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 		mutex_unlock(&m41t80_rtc_mutex);
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-		return nonseekable_open(inode, file);
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+		return stream_open(inode, file);
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 	}
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 	return -ENODEV;
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 }
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@@ -841,6 +836,7 @@
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 	.owner	= THIS_MODULE,
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 	.read	= wdt_read,
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 	.unlocked_ioctl = wdt_unlocked_ioctl,
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+	.compat_ioctl = compat_ptr_ioctl,
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 	.write	= wdt_write,
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 	.open	= wdt_open,
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 	.release = wdt_release,
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@@ -873,7 +869,7 @@
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 static int m41t80_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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 	int rc = 0;
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 	struct rtc_time tm;
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 	struct m41t80_data *m41t80_data = NULL;
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@@ -926,6 +922,8 @@
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 	}
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 	m41t80_data->rtc->ops = &m41t80_rtc_ops;
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+	m41t80_data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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+	m41t80_data->rtc->range_max = RTC_TIMESTAMP_END_2099;
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 	if (client->irq <= 0) {
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 		/* We cannot support UIE mode if we do not have an IRQ line */
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@@ -939,11 +937,7 @@
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 		if (m41t80_data->features & M41T80_FEATURE_HT) {
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 			m41t80_rtc_read_time(&client->dev, &tm);
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 			dev_info(&client->dev, "HT bit was set!\n");
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-			dev_info(&client->dev,
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-				 "Power Down at %04i-%02i-%02i %02i:%02i:%02i\n",
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-				 tm.tm_year + 1900,
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-				 tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
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-				 tm.tm_min, tm.tm_sec);
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+			dev_info(&client->dev, "Power Down at %ptR\n", &tm);
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 		}
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 		rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_HOUR,
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 					       rc & ~M41T80_ALHOUR_HT);