add ax88772C AX88772C_eeprom_tools

hc

2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/drivers/rtc/rtc-pcf8563.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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  * An I2C driver for the Philips PCF8563 RTC
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  * Copyright 2005-06 Tower Technologies
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@@ -8,10 +9,6 @@
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  * based on the other drivers in this same directory.
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  *
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  * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
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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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 #include <linux/clk-provider.h>
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@@ -25,8 +22,8 @@
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22
 
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 #define PCF8563_REG_ST1		0x00 /* status */
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 #define PCF8563_REG_ST2		0x01
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-#define PCF8563_BIT_AIE		(1 << 1)
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-#define PCF8563_BIT_AF		(1 << 3)
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+#define PCF8563_BIT_AIE		BIT(1)
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+#define PCF8563_BIT_AF		BIT(3)
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 #define PCF8563_BITS_ST2_N	(7 << 5)
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 #define PCF8563_REG_SC		0x02 /* datetime */
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@@ -79,7 +76,6 @@
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 	 * 1970...2069.
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 	 */
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 	int c_polarity;	/* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
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-	int voltage_low; /* incicates if a low_voltage was detected */
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 	struct i2c_client *client;
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 #ifdef CONFIG_COMMON_CLK
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@@ -199,8 +195,9 @@
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  * In the routines that deal directly with the pcf8563 hardware, we use
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  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
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  */
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-static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
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+static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
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 {
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+	struct i2c_client *client = to_i2c_client(dev);
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 	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
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 	unsigned char buf[9];
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 	int err;
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@@ -210,7 +207,6 @@
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 		return err;
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 	if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
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-		pcf8563->voltage_low = 1;
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 		dev_err(&client->dev,
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 			"low voltage detected, date/time is not reliable.\n");
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 		return -EINVAL;
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@@ -231,9 +227,7 @@
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 	tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
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 	tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
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 	tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
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-	tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
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-	if (tm->tm_year < 70)
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-		tm->tm_year += 100;	/* assume we are in 1970...2069 */
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+	tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]) + 100;
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 	/* detect the polarity heuristically. see note above. */
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 	pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
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 		(tm->tm_year >= 100) : (tm->tm_year < 100);
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@@ -247,8 +241,9 @@
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 	return 0;
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 }
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-static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
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+static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
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 {
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+	struct i2c_client *client = to_i2c_client(dev);
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 	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
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 	unsigned char buf[9];
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@@ -269,7 +264,7 @@
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 	buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
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 	/* year and century */
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-	buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
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+	buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year - 100);
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 	if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
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 		buf[PCF8563_REG_MO] |= PCF8563_MO_C;
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@@ -279,52 +274,22 @@
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 				9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
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 }
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-#ifdef CONFIG_RTC_INTF_DEV
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 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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 {
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-	struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
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-	struct rtc_time tm;
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+	struct i2c_client *client = to_i2c_client(dev);
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+	int ret;
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 	switch (cmd) {
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 	case RTC_VL_READ:
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-		if (pcf8563->voltage_low)
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-			dev_info(dev, "low voltage detected, date/time is not reliable.\n");
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+		ret = i2c_smbus_read_byte_data(client, PCF8563_REG_SC);
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+		if (ret < 0)
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+			return ret;
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-		if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
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-					sizeof(int)))
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-			return -EFAULT;
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-		return 0;
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-	case RTC_VL_CLR:
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-		/*
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-		 * Clear the VL bit in the seconds register in case
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-		 * the time has not been set already (which would
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-		 * have cleared it). This does not really matter
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-		 * because of the cached voltage_low value but do it
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-		 * anyway for consistency.
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-		 */
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-		if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
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-			pcf8563_set_datetime(to_i2c_client(dev), &tm);
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-
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-		/* Clear the cached value. */
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-		pcf8563->voltage_low = 0;
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-
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-		return 0;
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+		return put_user(ret & PCF8563_SC_LV ? RTC_VL_DATA_INVALID : 0,
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+				(unsigned int __user *)arg);
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 	default:
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 		return -ENOIOCTLCMD;
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 	}
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-}
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-#else
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-#define pcf8563_rtc_ioctl NULL
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-#endif
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-
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-static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
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-{
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-	return pcf8563_get_datetime(to_i2c_client(dev), tm);
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-}
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-
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-static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
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-{
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-	return pcf8563_set_datetime(to_i2c_client(dev), tm);
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 }
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 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
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@@ -403,7 +368,7 @@
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 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw)
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-static int clkout_rates[] = {
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+static const int clkout_rates[] = {
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 	32768,
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 	1024,
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 	32,
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@@ -513,7 +478,7 @@
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 	.set_rate = pcf8563_clkout_set_rate,
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 };
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-static __maybe_unused struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
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+static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
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 {
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 	struct i2c_client *client = pcf8563->client;
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 	struct device_node *node = client->dev.of_node;
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@@ -594,12 +559,16 @@
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 		return err;
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 	}
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-	pcf8563->rtc = devm_rtc_device_register(&client->dev,
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-				pcf8563_driver.driver.name,
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-				&pcf8563_rtc_ops, THIS_MODULE);
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-
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+	pcf8563->rtc = devm_rtc_allocate_device(&client->dev);
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 	if (IS_ERR(pcf8563->rtc))
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 		return PTR_ERR(pcf8563->rtc);
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+
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+	pcf8563->rtc->ops = &pcf8563_rtc_ops;
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+	/* the pcf8563 alarm only supports a minute accuracy */
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+	pcf8563->rtc->uie_unsupported = 1;
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+	pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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+	pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099;
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+	pcf8563->rtc->set_start_time = true;
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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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@@ -611,16 +580,16 @@
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 								client->irq);
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 			return err;
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 		}
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-
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 	}
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-#if defined(CONFIG_COMMON_CLK) && !defined(CONFIG_ROCKCHIP_THUNDER_BOOT)
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+	err = rtc_register_device(pcf8563->rtc);
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+	if (err)
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+		return err;
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+
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+#ifdef CONFIG_COMMON_CLK
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 	/* register clk in common clk framework */
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 	pcf8563_clkout_register_clk(pcf8563);
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 #endif
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-
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-	/* the pcf8563 alarm only supports a minute accuracy */
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-	pcf8563->rtc->uie_unsupported = 1;
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 	return 0;
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 }
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@@ -635,6 +604,8 @@
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 #ifdef CONFIG_OF
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 static const struct of_device_id pcf8563_of_match[] = {
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 	{ .compatible = "nxp,pcf8563" },
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+	{ .compatible = "epson,rtc8564" },
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+	{ .compatible = "microcrystal,rv8564" },
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 	{}
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 };
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 MODULE_DEVICE_TABLE(of, pcf8563_of_match);