diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf8563.c')
| -rw-r--r-- | drivers/rtc/rtc-pcf8563.c | 66 |
1 files changed, 29 insertions, 37 deletions
diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c index 3efc86c25d27..24baa4767b11 100644 --- a/drivers/rtc/rtc-pcf8563.c +++ b/drivers/rtc/rtc-pcf8563.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * An I2C driver for the Philips PCF8563 RTC * Copyright 2005-06 Tower Technologies @@ -8,10 +9,6 @@ * based on the other drivers in this same directory. * * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/clk-provider.h> @@ -199,8 +196,9 @@ static irqreturn_t pcf8563_irq(int irq, void *dev_id) * In the routines that deal directly with the pcf8563 hardware, we use * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. */ -static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) +static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) { + struct i2c_client *client = to_i2c_client(dev); struct pcf8563 *pcf8563 = i2c_get_clientdata(client); unsigned char buf[9]; int err; @@ -231,9 +229,7 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ - tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]); - if (tm->tm_year < 70) - tm->tm_year += 100; /* assume we are in 1970...2069 */ + tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]) + 100; /* detect the polarity heuristically. see note above. */ pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? (tm->tm_year >= 100) : (tm->tm_year < 100); @@ -247,8 +243,9 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) return 0; } -static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) +static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) { + struct i2c_client *client = to_i2c_client(dev); struct pcf8563 *pcf8563 = i2c_get_clientdata(client); unsigned char buf[9]; @@ -269,7 +266,7 @@ static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); /* year and century */ - buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100); + buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year - 100); if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) buf[PCF8563_REG_MO] |= PCF8563_MO_C; @@ -302,8 +299,8 @@ static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long * because of the cached voltage_low value but do it * anyway for consistency. */ - if (pcf8563_get_datetime(to_i2c_client(dev), &tm)) - pcf8563_set_datetime(to_i2c_client(dev), &tm); + if (pcf8563_rtc_read_time(dev, &tm)) + pcf8563_rtc_set_time(dev, &tm); /* Clear the cached value. */ pcf8563->voltage_low = 0; @@ -317,16 +314,6 @@ static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long #define pcf8563_rtc_ioctl NULL #endif -static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) -{ - return pcf8563_get_datetime(to_i2c_client(dev), tm); -} - -static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) -{ - return pcf8563_set_datetime(to_i2c_client(dev), tm); -} - static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) { struct i2c_client *client = to_i2c_client(dev); @@ -563,7 +550,6 @@ static int pcf8563_probe(struct i2c_client *client, struct pcf8563 *pcf8563; int err; unsigned char buf; - unsigned char alm_pending; dev_dbg(&client->dev, "%s\n", __func__); @@ -587,42 +573,46 @@ static int pcf8563_probe(struct i2c_client *client, return err; } - err = pcf8563_get_alarm_mode(client, NULL, &alm_pending); - if (err) { - dev_err(&client->dev, "%s: read error\n", __func__); + /* Clear flags and disable interrupts */ + buf = 0; + err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); + if (err < 0) { + dev_err(&client->dev, "%s: write error\n", __func__); return err; } - if (alm_pending) - pcf8563_set_alarm_mode(client, 0); - - pcf8563->rtc = devm_rtc_device_register(&client->dev, - pcf8563_driver.driver.name, - &pcf8563_rtc_ops, THIS_MODULE); + pcf8563->rtc = devm_rtc_allocate_device(&client->dev); if (IS_ERR(pcf8563->rtc)) return PTR_ERR(pcf8563->rtc); + pcf8563->rtc->ops = &pcf8563_rtc_ops; + /* the pcf8563 alarm only supports a minute accuracy */ + pcf8563->rtc->uie_unsupported = 1; + pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099; + pcf8563->rtc->set_start_time = true; + if (client->irq > 0) { err = devm_request_threaded_irq(&client->dev, client->irq, NULL, pcf8563_irq, - IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING, + IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW, pcf8563_driver.driver.name, client); if (err) { dev_err(&client->dev, "unable to request IRQ %d\n", client->irq); return err; } - } + err = rtc_register_device(pcf8563->rtc); + if (err) + return err; + #ifdef CONFIG_COMMON_CLK /* register clk in common clk framework */ pcf8563_clkout_register_clk(pcf8563); #endif - /* the pcf8563 alarm only supports a minute accuracy */ - pcf8563->rtc->uie_unsupported = 1; - return 0; } @@ -636,6 +626,8 @@ MODULE_DEVICE_TABLE(i2c, pcf8563_id); #ifdef CONFIG_OF static const struct of_device_id pcf8563_of_match[] = { { .compatible = "nxp,pcf8563" }, + { .compatible = "epson,rtc8564" }, + { .compatible = "microcrystal,rv8564" }, {} }; MODULE_DEVICE_TABLE(of, pcf8563_of_match); |
