516 lines
12 KiB
C
516 lines
12 KiB
C
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/*
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* Seiko Instruments S-35390A RTC Driver
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*
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* Copyright (c) 2007 Byron Bradley
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/i2c.h>
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#include <linux/bitrev.h>
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#include <linux/bcd.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#define S35390A_CMD_STATUS1 0
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#define S35390A_CMD_STATUS2 1
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#define S35390A_CMD_TIME1 2
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#define S35390A_CMD_TIME2 3
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#define S35390A_CMD_INT2_REG1 5
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#define S35390A_BYTE_YEAR 0
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#define S35390A_BYTE_MONTH 1
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#define S35390A_BYTE_DAY 2
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#define S35390A_BYTE_WDAY 3
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#define S35390A_BYTE_HOURS 4
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#define S35390A_BYTE_MINS 5
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#define S35390A_BYTE_SECS 6
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#define S35390A_ALRM_BYTE_WDAY 0
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#define S35390A_ALRM_BYTE_HOURS 1
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#define S35390A_ALRM_BYTE_MINS 2
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/* flags for STATUS1 */
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#define S35390A_FLAG_POC 0x01
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#define S35390A_FLAG_BLD 0x02
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#define S35390A_FLAG_INT2 0x04
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#define S35390A_FLAG_24H 0x40
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#define S35390A_FLAG_RESET 0x80
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/* flag for STATUS2 */
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#define S35390A_FLAG_TEST 0x01
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#define S35390A_INT2_MODE_MASK 0xF0
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#define S35390A_INT2_MODE_NOINTR 0x00
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#define S35390A_INT2_MODE_FREQ 0x10
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#define S35390A_INT2_MODE_ALARM 0x40
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#define S35390A_INT2_MODE_PMIN_EDG 0x20
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static const struct i2c_device_id s35390a_id[] = {
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{ "s35390a", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, s35390a_id);
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struct s35390a {
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struct i2c_client *client[8];
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struct rtc_device *rtc;
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int twentyfourhour;
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};
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static int s35390a_set_reg(struct s35390a *s35390a, int reg, char *buf, int len)
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{
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struct i2c_client *client = s35390a->client[reg];
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struct i2c_msg msg[] = {
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{
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.addr = client->addr,
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.len = len,
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.buf = buf
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},
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};
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if ((i2c_transfer(client->adapter, msg, 1)) != 1)
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return -EIO;
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return 0;
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}
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static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)
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{
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struct i2c_client *client = s35390a->client[reg];
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struct i2c_msg msg[] = {
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = len,
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.buf = buf
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},
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};
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if ((i2c_transfer(client->adapter, msg, 1)) != 1)
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return -EIO;
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return 0;
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}
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/*
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* Returns <0 on error, 0 if rtc is setup fine and 1 if the chip was reset.
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* To keep the information if an irq is pending, pass the value read from
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* STATUS1 to the caller.
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*/
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static int s35390a_reset(struct s35390a *s35390a, char *status1)
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{
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u8 buf;
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int ret;
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unsigned initcount = 0;
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ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, status1, 1);
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if (ret < 0)
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return ret;
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if (*status1 & S35390A_FLAG_POC)
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/*
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* Do not communicate for 0.5 seconds since the power-on
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* detection circuit is in operation.
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*/
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msleep(500);
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else if (!(*status1 & S35390A_FLAG_BLD))
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/*
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* If both POC and BLD are unset everything is fine.
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*/
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return 0;
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/*
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* At least one of POC and BLD are set, so reinitialise chip. Keeping
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* this information in the hardware to know later that the time isn't
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* valid is unfortunately not possible because POC and BLD are cleared
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* on read. So the reset is best done now.
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*
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* The 24H bit is kept over reset, so set it already here.
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*/
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initialize:
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*status1 = S35390A_FLAG_24H;
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buf = S35390A_FLAG_RESET | S35390A_FLAG_24H;
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ret = s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, &buf, 1);
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if (ret < 0)
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return ret;
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ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &buf, 1);
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if (ret < 0)
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return ret;
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if (buf & (S35390A_FLAG_POC | S35390A_FLAG_BLD)) {
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/* Try up to five times to reset the chip */
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if (initcount < 5) {
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++initcount;
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goto initialize;
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} else
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return -EIO;
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}
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return 1;
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}
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static int s35390a_disable_test_mode(struct s35390a *s35390a)
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{
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char buf[1];
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if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf)) < 0)
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return -EIO;
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if (!(buf[0] & S35390A_FLAG_TEST))
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return 0;
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buf[0] &= ~S35390A_FLAG_TEST;
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return s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf));
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}
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static char s35390a_hr2reg(struct s35390a *s35390a, int hour)
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{
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if (s35390a->twentyfourhour)
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return bin2bcd(hour);
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if (hour < 12)
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return bin2bcd(hour);
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return 0x40 | bin2bcd(hour - 12);
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}
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static int s35390a_reg2hr(struct s35390a *s35390a, char reg)
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{
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unsigned hour;
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if (s35390a->twentyfourhour)
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return bcd2bin(reg & 0x3f);
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hour = bcd2bin(reg & 0x3f);
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if (reg & 0x40)
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hour += 12;
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return hour;
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}
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static int s35390a_set_datetime(struct i2c_client *client, struct rtc_time *tm)
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{
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struct s35390a *s35390a = i2c_get_clientdata(client);
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int i, err;
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char buf[7];
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d mday=%d, "
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"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
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tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
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tm->tm_wday);
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buf[S35390A_BYTE_YEAR] = bin2bcd(tm->tm_year - 100);
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buf[S35390A_BYTE_MONTH] = bin2bcd(tm->tm_mon + 1);
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buf[S35390A_BYTE_DAY] = bin2bcd(tm->tm_mday);
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buf[S35390A_BYTE_WDAY] = bin2bcd(tm->tm_wday);
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buf[S35390A_BYTE_HOURS] = s35390a_hr2reg(s35390a, tm->tm_hour);
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buf[S35390A_BYTE_MINS] = bin2bcd(tm->tm_min);
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buf[S35390A_BYTE_SECS] = bin2bcd(tm->tm_sec);
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/* This chip expects the bits of each byte to be in reverse order */
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for (i = 0; i < 7; ++i)
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buf[i] = bitrev8(buf[i]);
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err = s35390a_set_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
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return err;
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}
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static int s35390a_get_datetime(struct i2c_client *client, struct rtc_time *tm)
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{
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struct s35390a *s35390a = i2c_get_clientdata(client);
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char buf[7];
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int i, err;
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err = s35390a_get_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
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if (err < 0)
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return err;
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/* This chip returns the bits of each byte in reverse order */
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for (i = 0; i < 7; ++i)
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buf[i] = bitrev8(buf[i]);
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tm->tm_sec = bcd2bin(buf[S35390A_BYTE_SECS]);
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tm->tm_min = bcd2bin(buf[S35390A_BYTE_MINS]);
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tm->tm_hour = s35390a_reg2hr(s35390a, buf[S35390A_BYTE_HOURS]);
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tm->tm_wday = bcd2bin(buf[S35390A_BYTE_WDAY]);
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tm->tm_mday = bcd2bin(buf[S35390A_BYTE_DAY]);
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tm->tm_mon = bcd2bin(buf[S35390A_BYTE_MONTH]) - 1;
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tm->tm_year = bcd2bin(buf[S35390A_BYTE_YEAR]) + 100;
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, mday=%d, "
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"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
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tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
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tm->tm_wday);
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return rtc_valid_tm(tm);
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}
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static int s35390a_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
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{
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struct s35390a *s35390a = i2c_get_clientdata(client);
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char buf[3], sts = 0;
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int err, i;
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dev_dbg(&client->dev, "%s: alm is secs=%d, mins=%d, hours=%d mday=%d, "\
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"mon=%d, year=%d, wday=%d\n", __func__, alm->time.tm_sec,
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alm->time.tm_min, alm->time.tm_hour, alm->time.tm_mday,
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alm->time.tm_mon, alm->time.tm_year, alm->time.tm_wday);
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/* disable interrupt (which deasserts the irq line) */
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err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
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if (err < 0)
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return err;
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/* clear pending interrupt (in STATUS1 only), if any */
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err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &sts, sizeof(sts));
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if (err < 0)
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return err;
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if (alm->enabled)
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sts = S35390A_INT2_MODE_ALARM;
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else
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sts = S35390A_INT2_MODE_NOINTR;
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/* This chip expects the bits of each byte to be in reverse order */
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sts = bitrev8(sts);
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/* set interupt mode*/
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err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
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if (err < 0)
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return err;
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if (alm->time.tm_wday != -1)
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buf[S35390A_ALRM_BYTE_WDAY] = bin2bcd(alm->time.tm_wday) | 0x80;
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else
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buf[S35390A_ALRM_BYTE_WDAY] = 0;
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buf[S35390A_ALRM_BYTE_HOURS] = s35390a_hr2reg(s35390a,
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alm->time.tm_hour) | 0x80;
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buf[S35390A_ALRM_BYTE_MINS] = bin2bcd(alm->time.tm_min) | 0x80;
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if (alm->time.tm_hour >= 12)
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buf[S35390A_ALRM_BYTE_HOURS] |= 0x40;
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for (i = 0; i < 3; ++i)
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buf[i] = bitrev8(buf[i]);
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err = s35390a_set_reg(s35390a, S35390A_CMD_INT2_REG1, buf,
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sizeof(buf));
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return err;
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}
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static int s35390a_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
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{
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struct s35390a *s35390a = i2c_get_clientdata(client);
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char buf[3], sts;
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int i, err;
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err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
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if (err < 0)
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return err;
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if ((bitrev8(sts) & S35390A_INT2_MODE_MASK) != S35390A_INT2_MODE_ALARM) {
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/*
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* When the alarm isn't enabled, the register to configure
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* the alarm time isn't accessible.
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*/
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alm->enabled = 0;
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return 0;
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} else {
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alm->enabled = 1;
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}
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err = s35390a_get_reg(s35390a, S35390A_CMD_INT2_REG1, buf, sizeof(buf));
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if (err < 0)
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return err;
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/* This chip returns the bits of each byte in reverse order */
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for (i = 0; i < 3; ++i)
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buf[i] = bitrev8(buf[i]);
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/*
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* B0 of the three matching registers is an enable flag. Iff it is set
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* the configured value is used for matching.
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*/
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if (buf[S35390A_ALRM_BYTE_WDAY] & 0x80)
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alm->time.tm_wday =
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bcd2bin(buf[S35390A_ALRM_BYTE_WDAY] & ~0x80);
|
||
|
|
|
||
|
|
if (buf[S35390A_ALRM_BYTE_HOURS] & 0x80)
|
||
|
|
alm->time.tm_hour =
|
||
|
|
s35390a_reg2hr(s35390a,
|
||
|
|
buf[S35390A_ALRM_BYTE_HOURS] & ~0x80);
|
||
|
|
|
||
|
|
if (buf[S35390A_ALRM_BYTE_MINS] & 0x80)
|
||
|
|
alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS] & ~0x80);
|
||
|
|
|
||
|
|
/* alarm triggers always at s=0 */
|
||
|
|
alm->time.tm_sec = 0;
|
||
|
|
|
||
|
|
dev_dbg(&client->dev, "%s: alm is mins=%d, hours=%d, wday=%d\n",
|
||
|
|
__func__, alm->time.tm_min, alm->time.tm_hour,
|
||
|
|
alm->time.tm_wday);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int s35390a_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
||
|
|
{
|
||
|
|
return s35390a_read_alarm(to_i2c_client(dev), alm);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int s35390a_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
||
|
|
{
|
||
|
|
return s35390a_set_alarm(to_i2c_client(dev), alm);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int s35390a_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
||
|
|
{
|
||
|
|
return s35390a_get_datetime(to_i2c_client(dev), tm);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
||
|
|
{
|
||
|
|
return s35390a_set_datetime(to_i2c_client(dev), tm);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct rtc_class_ops s35390a_rtc_ops = {
|
||
|
|
.read_time = s35390a_rtc_read_time,
|
||
|
|
.set_time = s35390a_rtc_set_time,
|
||
|
|
.set_alarm = s35390a_rtc_set_alarm,
|
||
|
|
.read_alarm = s35390a_rtc_read_alarm,
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct i2c_driver s35390a_driver;
|
||
|
|
|
||
|
|
static int s35390a_probe(struct i2c_client *client,
|
||
|
|
const struct i2c_device_id *id)
|
||
|
|
{
|
||
|
|
int err, err_reset;
|
||
|
|
unsigned int i;
|
||
|
|
struct s35390a *s35390a;
|
||
|
|
struct rtc_time tm;
|
||
|
|
char buf, status1;
|
||
|
|
|
||
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
||
|
|
err = -ENODEV;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
s35390a = devm_kzalloc(&client->dev, sizeof(struct s35390a),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!s35390a) {
|
||
|
|
err = -ENOMEM;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
s35390a->client[0] = client;
|
||
|
|
i2c_set_clientdata(client, s35390a);
|
||
|
|
|
||
|
|
/* This chip uses multiple addresses, use dummy devices for them */
|
||
|
|
for (i = 1; i < 8; ++i) {
|
||
|
|
s35390a->client[i] = i2c_new_dummy(client->adapter,
|
||
|
|
client->addr + i);
|
||
|
|
if (!s35390a->client[i]) {
|
||
|
|
dev_err(&client->dev, "Address %02x unavailable\n",
|
||
|
|
client->addr + i);
|
||
|
|
err = -EBUSY;
|
||
|
|
goto exit_dummy;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
err_reset = s35390a_reset(s35390a, &status1);
|
||
|
|
if (err_reset < 0) {
|
||
|
|
err = err_reset;
|
||
|
|
dev_err(&client->dev, "error resetting chip\n");
|
||
|
|
goto exit_dummy;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (status1 & S35390A_FLAG_24H)
|
||
|
|
s35390a->twentyfourhour = 1;
|
||
|
|
else
|
||
|
|
s35390a->twentyfourhour = 0;
|
||
|
|
|
||
|
|
if (status1 & S35390A_FLAG_INT2) {
|
||
|
|
/* disable alarm (and maybe test mode) */
|
||
|
|
buf = 0;
|
||
|
|
err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &buf, 1);
|
||
|
|
if (err < 0) {
|
||
|
|
dev_err(&client->dev, "error disabling alarm");
|
||
|
|
goto exit_dummy;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
err = s35390a_disable_test_mode(s35390a);
|
||
|
|
if (err < 0) {
|
||
|
|
dev_err(&client->dev, "error disabling test mode\n");
|
||
|
|
goto exit_dummy;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (err_reset > 0 || s35390a_get_datetime(client, &tm) < 0)
|
||
|
|
dev_warn(&client->dev, "clock needs to be set\n");
|
||
|
|
|
||
|
|
device_set_wakeup_capable(&client->dev, 1);
|
||
|
|
|
||
|
|
s35390a->rtc = devm_rtc_device_register(&client->dev,
|
||
|
|
s35390a_driver.driver.name,
|
||
|
|
&s35390a_rtc_ops, THIS_MODULE);
|
||
|
|
|
||
|
|
if (IS_ERR(s35390a->rtc)) {
|
||
|
|
err = PTR_ERR(s35390a->rtc);
|
||
|
|
goto exit_dummy;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (status1 & S35390A_FLAG_INT2)
|
||
|
|
rtc_update_irq(s35390a->rtc, 1, RTC_AF);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
exit_dummy:
|
||
|
|
for (i = 1; i < 8; ++i)
|
||
|
|
if (s35390a->client[i])
|
||
|
|
i2c_unregister_device(s35390a->client[i]);
|
||
|
|
|
||
|
|
exit:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int s35390a_remove(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
struct s35390a *s35390a = i2c_get_clientdata(client);
|
||
|
|
|
||
|
|
for (i = 1; i < 8; ++i)
|
||
|
|
if (s35390a->client[i])
|
||
|
|
i2c_unregister_device(s35390a->client[i]);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct i2c_driver s35390a_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "rtc-s35390a",
|
||
|
|
},
|
||
|
|
.probe = s35390a_probe,
|
||
|
|
.remove = s35390a_remove,
|
||
|
|
.id_table = s35390a_id,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_i2c_driver(s35390a_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Byron Bradley <byron.bbradley@gmail.com>");
|
||
|
|
MODULE_DESCRIPTION("S35390A RTC driver");
|
||
|
|
MODULE_LICENSE("GPL");
|