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linux_kernel/drivers/rtc/rtc-fm3130.c
Linus Torvalds edafb6fe42 RTC for 5.3 
Drivers:
  - ds1307: properly handle oscillator failure flags
  - imx-sc: alarm support
  - pcf2123: alarm support, correct offset handling
  - sun6i: add R40 support
  - simplify getting the adapter of an i2c client
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Merge tag 'rtc-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "A quiet cycle this time.

   - ds1307: properly handle oscillator failure flags

   - imx-sc: alarm support

   - pcf2123: alarm support, correct offset handling

   - sun6i: add R40 support

   - simplify getting the adapter of an i2c client"

* tag 'rtc-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (37 commits)
  rtc: wm831x: Add IRQF_ONESHOT flag
  rtc: stm32: remove one condition check in stm32_rtc_set_alarm()
  rtc: pcf2123: Fix build error
  rtc: interface: Change type of 'count' from int to u64
  rtc: pcf8563: Clear event flags and disable interrupts before requesting irq
  rtc: pcf8563: Fix interrupt trigger method
  rtc: pcf2123: fix negative offset rounding
  rtc: pcf2123: add alarm support
  rtc: pcf2123: use %ptR
  rtc: pcf2123: port to regmap
  rtc: pcf2123: remove sysfs register view
  rtc: rx8025: simplify getting the adapter of a client
  rtc: rx8010: simplify getting the adapter of a client
  rtc: rv8803: simplify getting the adapter of a client
  rtc: m41t80: simplify getting the adapter of a client
  rtc: fm3130: simplify getting the adapter of a client
  rtc: tegra: Drop MODULE_ALIAS
  rtc: sun6i: Add R40 compatible
  dt-bindings: rtc: sun6i: Add the R40 RTC compatible
  dt-bindings: rtc: Convert Allwinner A31 RTC to a schema
  ...
2019-07-17 10:03:50 -07:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* rtc-fm3130.c - RTC driver for Ramtron FM3130 I2C chip.
*
* Copyright (C) 2008 Sergey Lapin
* Based on ds1307 driver by James Chapman and David Brownell
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/slab.h>
#define FM3130_RTC_CONTROL (0x0)
#define FM3130_CAL_CONTROL (0x1)
#define FM3130_RTC_SECONDS (0x2)
#define FM3130_RTC_MINUTES (0x3)
#define FM3130_RTC_HOURS (0x4)
#define FM3130_RTC_DAY (0x5)
#define FM3130_RTC_DATE (0x6)
#define FM3130_RTC_MONTHS (0x7)
#define FM3130_RTC_YEARS (0x8)
#define FM3130_ALARM_SECONDS (0x9)
#define FM3130_ALARM_MINUTES (0xa)
#define FM3130_ALARM_HOURS (0xb)
#define FM3130_ALARM_DATE (0xc)
#define FM3130_ALARM_MONTHS (0xd)
#define FM3130_ALARM_WP_CONTROL (0xe)
#define FM3130_CAL_CONTROL_BIT_nOSCEN (1 << 7) /* Osciallator enabled */
#define FM3130_RTC_CONTROL_BIT_LB (1 << 7) /* Low battery */
#define FM3130_RTC_CONTROL_BIT_AF (1 << 6) /* Alarm flag */
#define FM3130_RTC_CONTROL_BIT_CF (1 << 5) /* Century overflow */
#define FM3130_RTC_CONTROL_BIT_POR (1 << 4) /* Power on reset */
#define FM3130_RTC_CONTROL_BIT_AEN (1 << 3) /* Alarm enable */
#define FM3130_RTC_CONTROL_BIT_CAL (1 << 2) /* Calibration mode */
#define FM3130_RTC_CONTROL_BIT_WRITE (1 << 1) /* W=1 -> write mode W=0 normal */
#define FM3130_RTC_CONTROL_BIT_READ (1 << 0) /* R=1 -> read mode R=0 normal */
#define FM3130_CLOCK_REGS 7
#define FM3130_ALARM_REGS 5
struct fm3130 {
u8 reg_addr_time;
u8 reg_addr_alarm;
u8 regs[15];
struct i2c_msg msg[4];
struct i2c_client *client;
struct rtc_device *rtc;
int alarm_valid;
int data_valid;
};
static const struct i2c_device_id fm3130_id[] = {
{ "fm3130", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, fm3130_id);
#define FM3130_MODE_NORMAL 0
#define FM3130_MODE_WRITE 1
#define FM3130_MODE_READ 2
static void fm3130_rtc_mode(struct device *dev, int mode)
{
struct fm3130 *fm3130 = dev_get_drvdata(dev);
fm3130->regs[FM3130_RTC_CONTROL] =
i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
switch (mode) {
case FM3130_MODE_NORMAL:
fm3130->regs[FM3130_RTC_CONTROL] &=
~(FM3130_RTC_CONTROL_BIT_WRITE |
FM3130_RTC_CONTROL_BIT_READ);
break;
case FM3130_MODE_WRITE:
fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_WRITE;
break;
case FM3130_MODE_READ:
fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_READ;
break;
default:
dev_dbg(dev, "invalid mode %d\n", mode);
break;
}
i2c_smbus_write_byte_data(fm3130->client,
FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL]);
}
static int fm3130_get_time(struct device *dev, struct rtc_time *t)
{
struct fm3130 *fm3130 = dev_get_drvdata(dev);
int tmp;
if (!fm3130->data_valid) {
/* We have invalid data in RTC, probably due
to battery faults or other problems. Return EIO
for now, it will allow us to set data later instead
of error during probing which disables device */
return -EIO;
}
fm3130_rtc_mode(dev, FM3130_MODE_READ);
/* read the RTC date and time registers all at once */
tmp = i2c_transfer(fm3130->client->adapter, fm3130->msg, 2);
if (tmp != 2) {
dev_err(dev, "%s error %d\n", "read", tmp);
return -EIO;
}
fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
dev_dbg(dev, "%s: %15ph\n", "read", fm3130->regs);
t->tm_sec = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
t->tm_min = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
tmp = fm3130->regs[FM3130_RTC_HOURS] & 0x3f;
t->tm_hour = bcd2bin(tmp);
t->tm_wday = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x07) - 1;
t->tm_mday = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
tmp = fm3130->regs[FM3130_RTC_MONTHS] & 0x1f;
t->tm_mon = bcd2bin(tmp) - 1;
/* assume 20YY not 19YY, and ignore CF bit */
t->tm_year = bcd2bin(fm3130->regs[FM3130_RTC_YEARS]) + 100;
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
"read", t->tm_sec, t->tm_min,
t->tm_hour, t->tm_mday,
t->tm_mon, t->tm_year, t->tm_wday);
return 0;
}
static int fm3130_set_time(struct device *dev, struct rtc_time *t)
{
struct fm3130 *fm3130 = dev_get_drvdata(dev);
int tmp, i;
u8 *buf = fm3130->regs;
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
"write", t->tm_sec, t->tm_min,
t->tm_hour, t->tm_mday,
t->tm_mon, t->tm_year, t->tm_wday);
/* first register addr */
buf[FM3130_RTC_SECONDS] = bin2bcd(t->tm_sec);
buf[FM3130_RTC_MINUTES] = bin2bcd(t->tm_min);
buf[FM3130_RTC_HOURS] = bin2bcd(t->tm_hour);
buf[FM3130_RTC_DAY] = bin2bcd(t->tm_wday + 1);
buf[FM3130_RTC_DATE] = bin2bcd(t->tm_mday);
buf[FM3130_RTC_MONTHS] = bin2bcd(t->tm_mon + 1);
/* assume 20YY not 19YY */
tmp = t->tm_year - 100;
buf[FM3130_RTC_YEARS] = bin2bcd(tmp);
dev_dbg(dev, "%s: %15ph\n", "write", buf);
fm3130_rtc_mode(dev, FM3130_MODE_WRITE);
/* Writing time registers, we don't support multibyte transfers */
for (i = 0; i < FM3130_CLOCK_REGS; i++) {
i2c_smbus_write_byte_data(fm3130->client,
FM3130_RTC_SECONDS + i,
fm3130->regs[FM3130_RTC_SECONDS + i]);
}
fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
/* We assume here that data are valid once written */
if (!fm3130->data_valid)
fm3130->data_valid = 1;
return 0;
}
static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct fm3130 *fm3130 = dev_get_drvdata(dev);
int tmp;
struct rtc_time *tm = &alrm->time;
if (!fm3130->alarm_valid) {
/*
* We have invalid alarm in RTC, probably due to battery faults
* or other problems. Return EIO for now, it will allow us to
* set alarm value later instead of error during probing which
* disables device
*/
return -EIO;
}
/* read the RTC alarm registers all at once */
tmp = i2c_transfer(fm3130->client->adapter, &fm3130->msg[2], 2);
if (tmp != 2) {
dev_err(dev, "%s error %d\n", "read", tmp);
return -EIO;
}
dev_dbg(dev, "alarm read %02x %02x %02x %02x %02x\n",
fm3130->regs[FM3130_ALARM_SECONDS],
fm3130->regs[FM3130_ALARM_MINUTES],
fm3130->regs[FM3130_ALARM_HOURS],
fm3130->regs[FM3130_ALARM_DATE],
fm3130->regs[FM3130_ALARM_MONTHS]);
tm->tm_sec = bcd2bin(fm3130->regs[FM3130_ALARM_SECONDS] & 0x7F);
tm->tm_min = bcd2bin(fm3130->regs[FM3130_ALARM_MINUTES] & 0x7F);
tm->tm_hour = bcd2bin(fm3130->regs[FM3130_ALARM_HOURS] & 0x3F);
tm->tm_mday = bcd2bin(fm3130->regs[FM3130_ALARM_DATE] & 0x3F);
tm->tm_mon = bcd2bin(fm3130->regs[FM3130_ALARM_MONTHS] & 0x1F);
if (tm->tm_mon > 0)
tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
"read alarm", tm->tm_sec, tm->tm_min,
tm->tm_hour, tm->tm_mday,
tm->tm_mon, tm->tm_year, tm->tm_wday);
/* check if alarm enabled */
fm3130->regs[FM3130_RTC_CONTROL] =
i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
if ((fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AEN) &&
(~fm3130->regs[FM3130_RTC_CONTROL] &
FM3130_RTC_CONTROL_BIT_CAL)) {
alrm->enabled = 1;
}
return 0;
}
static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct fm3130 *fm3130 = dev_get_drvdata(dev);
struct rtc_time *tm = &alrm->time;
int i;
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
"write alarm", tm->tm_sec, tm->tm_min,
tm->tm_hour, tm->tm_mday,
tm->tm_mon, tm->tm_year, tm->tm_wday);
fm3130->regs[FM3130_ALARM_SECONDS] =
(tm->tm_sec != -1) ? bin2bcd(tm->tm_sec) : 0x80;
fm3130->regs[FM3130_ALARM_MINUTES] =
(tm->tm_min != -1) ? bin2bcd(tm->tm_min) : 0x80;
fm3130->regs[FM3130_ALARM_HOURS] =
(tm->tm_hour != -1) ? bin2bcd(tm->tm_hour) : 0x80;
fm3130->regs[FM3130_ALARM_DATE] =
(tm->tm_mday != -1) ? bin2bcd(tm->tm_mday) : 0x80;
fm3130->regs[FM3130_ALARM_MONTHS] =
(tm->tm_mon != -1) ? bin2bcd(tm->tm_mon + 1) : 0x80;
dev_dbg(dev, "alarm write %02x %02x %02x %02x %02x\n",
fm3130->regs[FM3130_ALARM_SECONDS],
fm3130->regs[FM3130_ALARM_MINUTES],
fm3130->regs[FM3130_ALARM_HOURS],
fm3130->regs[FM3130_ALARM_DATE],
fm3130->regs[FM3130_ALARM_MONTHS]);
/* Writing time registers, we don't support multibyte transfers */
for (i = 0; i < FM3130_ALARM_REGS; i++) {
i2c_smbus_write_byte_data(fm3130->client,
FM3130_ALARM_SECONDS + i,
fm3130->regs[FM3130_ALARM_SECONDS + i]);
}
fm3130->regs[FM3130_RTC_CONTROL] =
i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
/* enable or disable alarm */
if (alrm->enabled) {
i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
(fm3130->regs[FM3130_RTC_CONTROL] &
~(FM3130_RTC_CONTROL_BIT_CAL)) |
FM3130_RTC_CONTROL_BIT_AEN);
} else {
i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
fm3130->regs[FM3130_RTC_CONTROL] &
~(FM3130_RTC_CONTROL_BIT_CAL) &
~(FM3130_RTC_CONTROL_BIT_AEN));
}
/* We assume here that data is valid once written */
if (!fm3130->alarm_valid)
fm3130->alarm_valid = 1;
return 0;
}
static int fm3130_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct fm3130 *fm3130 = dev_get_drvdata(dev);
int ret = 0;
fm3130->regs[FM3130_RTC_CONTROL] =
i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
dev_dbg(dev, "alarm_irq_enable: enable=%d, FM3130_RTC_CONTROL=%02x\n",
enabled, fm3130->regs[FM3130_RTC_CONTROL]);
switch (enabled) {
case 0: /* alarm off */
ret = i2c_smbus_write_byte_data(fm3130->client,
FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL] &
~(FM3130_RTC_CONTROL_BIT_CAL) &
~(FM3130_RTC_CONTROL_BIT_AEN));
break;
case 1: /* alarm on */
ret = i2c_smbus_write_byte_data(fm3130->client,
FM3130_RTC_CONTROL, (fm3130->regs[FM3130_RTC_CONTROL] &
~(FM3130_RTC_CONTROL_BIT_CAL)) |
FM3130_RTC_CONTROL_BIT_AEN);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct rtc_class_ops fm3130_rtc_ops = {
.read_time = fm3130_get_time,
.set_time = fm3130_set_time,
.read_alarm = fm3130_read_alarm,
.set_alarm = fm3130_set_alarm,
.alarm_irq_enable = fm3130_alarm_irq_enable,
};
static struct i2c_driver fm3130_driver;
static int fm3130_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct fm3130 *fm3130;
int err = -ENODEV;
int tmp;
struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter,
I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
return -EIO;
fm3130 = devm_kzalloc(&client->dev, sizeof(struct fm3130), GFP_KERNEL);
if (!fm3130)
return -ENOMEM;
fm3130->client = client;
i2c_set_clientdata(client, fm3130);
fm3130->reg_addr_time = FM3130_RTC_SECONDS;
fm3130->reg_addr_alarm = FM3130_ALARM_SECONDS;
/* Messages to read time */
fm3130->msg[0].addr = client->addr;
fm3130->msg[0].flags = 0;
fm3130->msg[0].len = 1;
fm3130->msg[0].buf = &fm3130->reg_addr_time;
fm3130->msg[1].addr = client->addr;
fm3130->msg[1].flags = I2C_M_RD;
fm3130->msg[1].len = FM3130_CLOCK_REGS;
fm3130->msg[1].buf = &fm3130->regs[FM3130_RTC_SECONDS];
/* Messages to read alarm */
fm3130->msg[2].addr = client->addr;
fm3130->msg[2].flags = 0;
fm3130->msg[2].len = 1;
fm3130->msg[2].buf = &fm3130->reg_addr_alarm;
fm3130->msg[3].addr = client->addr;
fm3130->msg[3].flags = I2C_M_RD;
fm3130->msg[3].len = FM3130_ALARM_REGS;
fm3130->msg[3].buf = &fm3130->regs[FM3130_ALARM_SECONDS];
fm3130->alarm_valid = 0;
fm3130->data_valid = 0;
tmp = i2c_transfer(adapter, fm3130->msg, 4);
if (tmp != 4) {
dev_dbg(&client->dev, "read error %d\n", tmp);
err = -EIO;
goto exit_free;
}
fm3130->regs[FM3130_RTC_CONTROL] =
i2c_smbus_read_byte_data(client, FM3130_RTC_CONTROL);
fm3130->regs[FM3130_CAL_CONTROL] =
i2c_smbus_read_byte_data(client, FM3130_CAL_CONTROL);
/* Disabling calibration mode */
if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_CAL) {
i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
fm3130->regs[FM3130_RTC_CONTROL] &
~(FM3130_RTC_CONTROL_BIT_CAL));
dev_warn(&client->dev, "Disabling calibration mode!\n");
}
/* Disabling read and write modes */
if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_WRITE ||
fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_READ) {
i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
fm3130->regs[FM3130_RTC_CONTROL] &
~(FM3130_RTC_CONTROL_BIT_READ |
FM3130_RTC_CONTROL_BIT_WRITE));
dev_warn(&client->dev, "Disabling READ or WRITE mode!\n");
}
/* oscillator off? turn it on, so clock can tick. */
if (fm3130->regs[FM3130_CAL_CONTROL] & FM3130_CAL_CONTROL_BIT_nOSCEN)
i2c_smbus_write_byte_data(client, FM3130_CAL_CONTROL,
fm3130->regs[FM3130_CAL_CONTROL] &
~(FM3130_CAL_CONTROL_BIT_nOSCEN));
/* low battery? clear flag, and warn */
if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB) {
i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
fm3130->regs[FM3130_RTC_CONTROL] &
~(FM3130_RTC_CONTROL_BIT_LB));
dev_warn(&client->dev, "Low battery!\n");
}
/* check if Power On Reset bit is set */
if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) {
i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
fm3130->regs[FM3130_RTC_CONTROL] &
~FM3130_RTC_CONTROL_BIT_POR);
dev_dbg(&client->dev, "POR bit is set\n");
}
/* ACS is controlled by alarm */
i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80);
/* alarm registers sanity check */
tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
if (tmp > 59)
goto bad_alarm;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
if (tmp > 59)
goto bad_alarm;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
if (tmp > 23)
goto bad_alarm;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
if (tmp == 0 || tmp > 31)
goto bad_alarm;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
if (tmp == 0 || tmp > 12)
goto bad_alarm;
fm3130->alarm_valid = 1;
bad_alarm:
/* clock registers sanity chek */
tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
if (tmp > 59)
goto bad_clock;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
if (tmp > 59)
goto bad_clock;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
if (tmp > 23)
goto bad_clock;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x7);
if (tmp == 0 || tmp > 7)
goto bad_clock;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
if (tmp == 0 || tmp > 31)
goto bad_clock;
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
if (tmp == 0 || tmp > 12)
goto bad_clock;
fm3130->data_valid = 1;
bad_clock:
if (!fm3130->data_valid || !fm3130->alarm_valid)
dev_dbg(&client->dev, "%s: %15ph\n", "bogus registers",
fm3130->regs);
/* We won't bail out here because we just got invalid data.
Time setting from u-boot doesn't work anyway */
fm3130->rtc = devm_rtc_device_register(&client->dev, client->name,
&fm3130_rtc_ops, THIS_MODULE);
if (IS_ERR(fm3130->rtc)) {
err = PTR_ERR(fm3130->rtc);
dev_err(&client->dev,
"unable to register the class device\n");
goto exit_free;
}
return 0;
exit_free:
return err;
}
static struct i2c_driver fm3130_driver = {
.driver = {
.name = "rtc-fm3130",
},
.probe = fm3130_probe,
.id_table = fm3130_id,
};
module_i2c_driver(fm3130_driver);
MODULE_DESCRIPTION("RTC driver for FM3130");
MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
MODULE_LICENSE("GPL");
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