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![Uwe Kleine-König](/assets/img/avatar_default.png)
Since all time members of the alarm data is initialized to -1 the drivers
are responsible to set the tm_sec member to 0.
Fixes: d68778b80d
("rtc: initialize output parameter for read alarm to "uninitialized"")
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
657 lines
17 KiB
C
657 lines
17 KiB
C
/*
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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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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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* Maintainers: http://www.nslu2-linux.org/
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*
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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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#include <linux/i2c.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/err.h>
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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_BITS_ST2_N (7 << 5)
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#define PCF8563_REG_SC 0x02 /* datetime */
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#define PCF8563_REG_MN 0x03
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#define PCF8563_REG_HR 0x04
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#define PCF8563_REG_DM 0x05
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#define PCF8563_REG_DW 0x06
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#define PCF8563_REG_MO 0x07
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#define PCF8563_REG_YR 0x08
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#define PCF8563_REG_AMN 0x09 /* alarm */
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#define PCF8563_REG_CLKO 0x0D /* clock out */
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#define PCF8563_REG_CLKO_FE 0x80 /* clock out enabled */
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#define PCF8563_REG_CLKO_F_MASK 0x03 /* frequenc mask */
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#define PCF8563_REG_CLKO_F_32768HZ 0x00
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#define PCF8563_REG_CLKO_F_1024HZ 0x01
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#define PCF8563_REG_CLKO_F_32HZ 0x02
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#define PCF8563_REG_CLKO_F_1HZ 0x03
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#define PCF8563_REG_TMRC 0x0E /* timer control */
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#define PCF8563_TMRC_ENABLE BIT(7)
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#define PCF8563_TMRC_4096 0
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#define PCF8563_TMRC_64 1
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#define PCF8563_TMRC_1 2
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#define PCF8563_TMRC_1_60 3
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#define PCF8563_TMRC_MASK 3
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#define PCF8563_REG_TMR 0x0F /* timer */
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#define PCF8563_SC_LV 0x80 /* low voltage */
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#define PCF8563_MO_C 0x80 /* century */
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static struct i2c_driver pcf8563_driver;
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struct pcf8563 {
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struct rtc_device *rtc;
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/*
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* The meaning of MO_C bit varies by the chip type.
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* From PCF8563 datasheet: this bit is toggled when the years
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* register overflows from 99 to 00
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* 0 indicates the century is 20xx
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* 1 indicates the century is 19xx
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* From RTC8564 datasheet: this bit indicates change of
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* century. When the year digit data overflows from 99 to 00,
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* this bit is set. By presetting it to 0 while still in the
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* 20th century, it will be set in year 2000, ...
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* There seems no reliable way to know how the system use this
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* bit. So let's do it heuristically, assuming we are live in
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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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struct clk_hw clkout_hw;
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#endif
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};
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static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
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unsigned char length, unsigned char *buf)
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{
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struct i2c_msg msgs[] = {
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{/* setup read ptr */
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.addr = client->addr,
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.len = 1,
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.buf = ®,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = length,
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.buf = buf
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},
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};
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if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
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dev_err(&client->dev, "%s: read error\n", __func__);
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return -EIO;
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}
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return 0;
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}
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static int pcf8563_write_block_data(struct i2c_client *client,
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unsigned char reg, unsigned char length,
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unsigned char *buf)
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{
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int i, err;
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for (i = 0; i < length; i++) {
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unsigned char data[2] = { reg + i, buf[i] };
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err = i2c_master_send(client, data, sizeof(data));
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if (err != sizeof(data)) {
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dev_err(&client->dev,
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"%s: err=%d addr=%02x, data=%02x\n",
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__func__, err, data[0], data[1]);
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return -EIO;
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}
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}
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return 0;
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}
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static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
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{
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unsigned char buf;
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
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if (err < 0)
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return err;
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if (on)
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buf |= PCF8563_BIT_AIE;
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else
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buf &= ~PCF8563_BIT_AIE;
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buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N);
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err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
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if (err < 0) {
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dev_err(&client->dev, "%s: write error\n", __func__);
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return -EIO;
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}
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return 0;
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}
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static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
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unsigned char *pen)
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{
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unsigned char buf;
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
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if (err)
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return err;
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if (en)
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*en = !!(buf & PCF8563_BIT_AIE);
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if (pen)
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*pen = !!(buf & PCF8563_BIT_AF);
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return 0;
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}
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static irqreturn_t pcf8563_irq(int irq, void *dev_id)
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{
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struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
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int err;
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char pending;
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err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
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if (err)
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return IRQ_NONE;
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if (pending) {
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rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
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pcf8563_set_alarm_mode(pcf8563->client, 1);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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/*
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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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{
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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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err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
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if (err)
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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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}
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dev_dbg(&client->dev,
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"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
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"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
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__func__,
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buf[0], buf[1], buf[2], buf[3],
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buf[4], buf[5], buf[6], buf[7],
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buf[8]);
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tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
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tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
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tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
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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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/* 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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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
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"mday=%d, mon=%d, year=%d, wday=%d\n",
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__func__,
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tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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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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{
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struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
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unsigned char buf[9];
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dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
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"mday=%d, mon=%d, year=%d, wday=%d\n",
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__func__,
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tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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/* hours, minutes and seconds */
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buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
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buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
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buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
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buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
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/* month, 1 - 12 */
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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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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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buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
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return pcf8563_write_block_data(client, PCF8563_REG_SC,
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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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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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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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/* Clear the cached value. */
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pcf8563->voltage_low = 0;
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return 0;
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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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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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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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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[4];
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
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if (err)
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return err;
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dev_dbg(&client->dev,
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"%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
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__func__, buf[0], buf[1], buf[2], buf[3]);
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tm->time.tm_sec = 0;
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tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
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tm->time.tm_hour = bcd2bin(buf[1] & 0x3F);
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tm->time.tm_mday = bcd2bin(buf[2] & 0x3F);
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tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
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err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
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if (err < 0)
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return err;
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dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
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" enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
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tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
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tm->enabled, tm->pending);
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return 0;
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}
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static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[4];
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int err;
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/* The alarm has no seconds, round up to nearest minute */
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if (tm->time.tm_sec) {
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time64_t alarm_time = rtc_tm_to_time64(&tm->time);
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alarm_time += 60 - tm->time.tm_sec;
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rtc_time64_to_tm(alarm_time, &tm->time);
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}
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dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
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"enabled=%d pending=%d\n", __func__,
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tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
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tm->time.tm_mday, tm->enabled, tm->pending);
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buf[0] = bin2bcd(tm->time.tm_min);
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buf[1] = bin2bcd(tm->time.tm_hour);
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buf[2] = bin2bcd(tm->time.tm_mday);
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buf[3] = tm->time.tm_wday & 0x07;
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err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
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if (err)
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return err;
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return pcf8563_set_alarm_mode(client, 1);
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}
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static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
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{
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dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
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return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
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}
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#ifdef CONFIG_COMMON_CLK
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/*
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* Handling of the clkout
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*/
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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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32768,
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1024,
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32,
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1,
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};
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static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
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struct i2c_client *client = pcf8563->client;
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unsigned char buf;
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int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
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if (ret < 0)
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return 0;
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buf &= PCF8563_REG_CLKO_F_MASK;
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return clkout_rates[ret];
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}
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static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
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if (clkout_rates[i] <= rate)
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return clkout_rates[i];
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return 0;
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}
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static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
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struct i2c_client *client = pcf8563->client;
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unsigned char buf;
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int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
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int i;
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if (ret < 0)
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return ret;
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for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
|
|
if (clkout_rates[i] == rate) {
|
|
buf &= ~PCF8563_REG_CLKO_F_MASK;
|
|
buf |= i;
|
|
ret = pcf8563_write_block_data(client,
|
|
PCF8563_REG_CLKO, 1,
|
|
&buf);
|
|
return ret;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int pcf8563_clkout_control(struct clk_hw *hw, bool enable)
|
|
{
|
|
struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
|
|
struct i2c_client *client = pcf8563->client;
|
|
unsigned char buf;
|
|
int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (enable)
|
|
buf |= PCF8563_REG_CLKO_FE;
|
|
else
|
|
buf &= ~PCF8563_REG_CLKO_FE;
|
|
|
|
ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
return ret;
|
|
}
|
|
|
|
static int pcf8563_clkout_prepare(struct clk_hw *hw)
|
|
{
|
|
return pcf8563_clkout_control(hw, 1);
|
|
}
|
|
|
|
static void pcf8563_clkout_unprepare(struct clk_hw *hw)
|
|
{
|
|
pcf8563_clkout_control(hw, 0);
|
|
}
|
|
|
|
static int pcf8563_clkout_is_prepared(struct clk_hw *hw)
|
|
{
|
|
struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
|
|
struct i2c_client *client = pcf8563->client;
|
|
unsigned char buf;
|
|
int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return !!(buf & PCF8563_REG_CLKO_FE);
|
|
}
|
|
|
|
static const struct clk_ops pcf8563_clkout_ops = {
|
|
.prepare = pcf8563_clkout_prepare,
|
|
.unprepare = pcf8563_clkout_unprepare,
|
|
.is_prepared = pcf8563_clkout_is_prepared,
|
|
.recalc_rate = pcf8563_clkout_recalc_rate,
|
|
.round_rate = pcf8563_clkout_round_rate,
|
|
.set_rate = pcf8563_clkout_set_rate,
|
|
};
|
|
|
|
static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
|
|
{
|
|
struct i2c_client *client = pcf8563->client;
|
|
struct device_node *node = client->dev.of_node;
|
|
struct clk *clk;
|
|
struct clk_init_data init;
|
|
int ret;
|
|
unsigned char buf;
|
|
|
|
/* disable the clkout output */
|
|
buf = 0;
|
|
ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
init.name = "pcf8563-clkout";
|
|
init.ops = &pcf8563_clkout_ops;
|
|
init.flags = 0;
|
|
init.parent_names = NULL;
|
|
init.num_parents = 0;
|
|
pcf8563->clkout_hw.init = &init;
|
|
|
|
/* optional override of the clockname */
|
|
of_property_read_string(node, "clock-output-names", &init.name);
|
|
|
|
/* register the clock */
|
|
clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw);
|
|
|
|
if (!IS_ERR(clk))
|
|
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
|
|
|
return clk;
|
|
}
|
|
#endif
|
|
|
|
static const struct rtc_class_ops pcf8563_rtc_ops = {
|
|
.ioctl = pcf8563_rtc_ioctl,
|
|
.read_time = pcf8563_rtc_read_time,
|
|
.set_time = pcf8563_rtc_set_time,
|
|
.read_alarm = pcf8563_rtc_read_alarm,
|
|
.set_alarm = pcf8563_rtc_set_alarm,
|
|
.alarm_irq_enable = pcf8563_irq_enable,
|
|
};
|
|
|
|
static int pcf8563_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pcf8563 *pcf8563;
|
|
int err;
|
|
unsigned char buf;
|
|
unsigned char alm_pending;
|
|
|
|
dev_dbg(&client->dev, "%s\n", __func__);
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
|
return -ENODEV;
|
|
|
|
pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
|
|
GFP_KERNEL);
|
|
if (!pcf8563)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, pcf8563);
|
|
pcf8563->client = client;
|
|
device_set_wakeup_capable(&client->dev, 1);
|
|
|
|
/* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
|
|
buf = PCF8563_TMRC_1_60;
|
|
err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "%s: write error\n", __func__);
|
|
return err;
|
|
}
|
|
|
|
err = pcf8563_get_alarm_mode(client, NULL, &alm_pending);
|
|
if (err) {
|
|
dev_err(&client->dev, "%s: read 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);
|
|
|
|
if (IS_ERR(pcf8563->rtc))
|
|
return PTR_ERR(pcf8563->rtc);
|
|
|
|
if (client->irq > 0) {
|
|
err = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, pcf8563_irq,
|
|
IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
|
|
pcf8563->rtc->name, client);
|
|
if (err) {
|
|
dev_err(&client->dev, "unable to request IRQ %d\n",
|
|
client->irq);
|
|
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;
|
|
}
|
|
|
|
static const struct i2c_device_id pcf8563_id[] = {
|
|
{ "pcf8563", 0 },
|
|
{ "rtc8564", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, pcf8563_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id pcf8563_of_match[] = {
|
|
{ .compatible = "nxp,pcf8563" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pcf8563_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver pcf8563_driver = {
|
|
.driver = {
|
|
.name = "rtc-pcf8563",
|
|
.of_match_table = of_match_ptr(pcf8563_of_match),
|
|
},
|
|
.probe = pcf8563_probe,
|
|
.id_table = pcf8563_id,
|
|
};
|
|
|
|
module_i2c_driver(pcf8563_driver);
|
|
|
|
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
|
|
MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
|
|
MODULE_LICENSE("GPL");
|