Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * A driver for the I2C members of the Abracon AB x8xx RTC family,
 * and compatible: AB 1805 and AB 0805
 *
 * Copyright 2014-2015 Macq S.A.
 *
 * Author: Philippe De Muyter <phdm@macqel.be>
 * Author: Alexandre Belloni <alexandre.belloni@bootlin.com>
 *
 */
 
#include <linux/bcd.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/rtc.h>
#include <linux/watchdog.h>
 
#define ABX8XX_REG_HTH		0x00
#define ABX8XX_REG_SC		0x01
#define ABX8XX_REG_MN		0x02
#define ABX8XX_REG_HR		0x03
#define ABX8XX_REG_DA		0x04
#define ABX8XX_REG_MO		0x05
#define ABX8XX_REG_YR		0x06
#define ABX8XX_REG_WD		0x07
 
#define ABX8XX_REG_AHTH		0x08
#define ABX8XX_REG_ASC		0x09
#define ABX8XX_REG_AMN		0x0a
#define ABX8XX_REG_AHR		0x0b
#define ABX8XX_REG_ADA		0x0c
#define ABX8XX_REG_AMO		0x0d
#define ABX8XX_REG_AWD		0x0e
 
#define ABX8XX_REG_STATUS	0x0f
#define ABX8XX_STATUS_AF	BIT(2)
#define ABX8XX_STATUS_BLF	BIT(4)
#define ABX8XX_STATUS_WDT	BIT(6)
 
#define ABX8XX_REG_CTRL1	0x10
#define ABX8XX_CTRL_WRITE	BIT(0)
#define ABX8XX_CTRL_ARST	BIT(2)
#define ABX8XX_CTRL_12_24	BIT(6)
 
#define ABX8XX_REG_CTRL2	0x11
#define ABX8XX_CTRL2_RSVD	BIT(5)
 
#define ABX8XX_REG_IRQ		0x12
#define ABX8XX_IRQ_AIE		BIT(2)
#define ABX8XX_IRQ_IM_1_4	(0x3 << 5)
 
#define ABX8XX_REG_CD_TIMER_CTL	0x18
 
#define ABX8XX_REG_OSC		0x1c
#define ABX8XX_OSC_FOS		BIT(3)
#define ABX8XX_OSC_BOS		BIT(4)
#define ABX8XX_OSC_ACAL_512	BIT(5)
#define ABX8XX_OSC_ACAL_1024	BIT(6)
 
#define ABX8XX_OSC_OSEL		BIT(7)
 
#define ABX8XX_REG_OSS		0x1d
#define ABX8XX_OSS_OF		BIT(1)
#define ABX8XX_OSS_OMODE	BIT(4)
 
#define ABX8XX_REG_WDT		0x1b
#define ABX8XX_WDT_WDS		BIT(7)
#define ABX8XX_WDT_BMB_MASK	0x7c
#define ABX8XX_WDT_BMB_SHIFT	2
#define ABX8XX_WDT_MAX_TIME	(ABX8XX_WDT_BMB_MASK >> ABX8XX_WDT_BMB_SHIFT)
#define ABX8XX_WDT_WRB_MASK	0x03
#define ABX8XX_WDT_WRB_1HZ	0x02
 
#define ABX8XX_REG_CFG_KEY	0x1f
#define ABX8XX_CFG_KEY_OSC	0xa1
#define ABX8XX_CFG_KEY_MISC	0x9d
 
#define ABX8XX_REG_ID0		0x28
 
#define ABX8XX_REG_OUT_CTRL	0x30
#define ABX8XX_OUT_CTRL_EXDS	BIT(4)
 
#define ABX8XX_REG_TRICKLE	0x20
#define ABX8XX_TRICKLE_CHARGE_ENABLE	0xa0
#define ABX8XX_TRICKLE_STANDARD_DIODE	0x8
#define ABX8XX_TRICKLE_SCHOTTKY_DIODE	0x4
 
static u8 trickle_resistors[] = {0, 3, 6, 11};
 
enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
<------>AB1801, AB1803, AB1804, AB1805, RV1805, ABX80X};
 
struct abx80x_cap {
<------>u16 pn;
<------>bool has_tc;
<------>bool has_wdog;
};
 
static struct abx80x_cap abx80x_caps[] = {
<------>[AB0801] = {.pn = 0x0801},
<------>[AB0803] = {.pn = 0x0803},
<------>[AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true},
<------>[AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true},
<------>[AB1801] = {.pn = 0x1801},
<------>[AB1803] = {.pn = 0x1803},
<------>[AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true},
<------>[AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
<------>[RV1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
<------>[ABX80X] = {.pn = 0}
};
 
struct abx80x_priv {
<------>struct rtc_device *rtc;
<------>struct i2c_client *client;
<------>struct watchdog_device wdog;
};
 
static int abx80x_is_rc_mode(struct i2c_client *client)
{
<------>int flags = 0;
 
<------>flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
<------>if (flags < 0) {
<------><------>dev_err(&client->dev,
<------><------><------>"Failed to read autocalibration attribute\n");
<------><------>return flags;
<------>}
 
<------>return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
}
 
static int abx80x_enable_trickle_charger(struct i2c_client *client,
<------><------><------><------><------> u8 trickle_cfg)
{
<------>int err;
 
<------>/*
<------> * Write the configuration key register to enable access to the Trickle
<------> * register
<------> */
<------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
<------><------><------><------><------>ABX8XX_CFG_KEY_MISC);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to write configuration key\n");
<------><------>return -EIO;
<------>}
 
<------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
<------><------><------><------><------>ABX8XX_TRICKLE_CHARGE_ENABLE |
<------><------><------><------><------>trickle_cfg);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to write trickle register\n");
<------><------>return -EIO;
<------>}
 
<------>return 0;
}
 
static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>unsigned char buf[8];
<------>int err, flags, rc_mode = 0;
 
<------>/* Read the Oscillator Failure only in XT mode */
<------>rc_mode = abx80x_is_rc_mode(client);
<------>if (rc_mode < 0)
<------><------>return rc_mode;
 
<------>if (!rc_mode) {
<------><------>flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
<------><------>if (flags < 0)
<------><------><------>return flags;
 
<------><------>if (flags & ABX8XX_OSS_OF) {
<------><------><------>dev_err(dev, "Oscillator failure, data is invalid.\n");
<------><------><------>return -EINVAL;
<------><------>}
<------>}
 
<------>err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
<------><------><------><------><------>    sizeof(buf), buf);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to read date\n");
<------><------>return -EIO;
<------>}
 
<------>tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F);
<------>tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F);
<------>tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F);
<------>tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7;
<------>tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F);
<------>tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1;
<------>tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100;
 
<------>return 0;
}
 
static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>unsigned char buf[8];
<------>int err, flags;
 
<------>if (tm->tm_year < 100)
<------><------>return -EINVAL;
 
<------>buf[ABX8XX_REG_HTH] = 0;
<------>buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
<------>buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
<------>buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
<------>buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
<------>buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
<------>buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
<------>buf[ABX8XX_REG_WD] = tm->tm_wday;
 
<------>err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
<------><------><------><------><------>     sizeof(buf), buf);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to write to date registers\n");
<------><------>return -EIO;
<------>}
 
<------>/* Clear the OF bit of Oscillator Status Register */
<------>flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
<------>if (flags < 0)
<------><------>return flags;
 
<------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
<------><------><------><------><------>flags & ~ABX8XX_OSS_OF);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to write oscillator status register\n");
<------><------>return err;
<------>}
 
<------>return 0;
}
 
static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
{
<------>struct i2c_client *client = dev_id;
<------>struct abx80x_priv *priv = i2c_get_clientdata(client);
<------>struct rtc_device *rtc = priv->rtc;
<------>int status;
 
<------>status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
<------>if (status < 0)
<------><------>return IRQ_NONE;
 
<------>if (status & ABX8XX_STATUS_AF)
<------><------>rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
 
<------>/*
<------> * It is unclear if we'll get an interrupt before the external
<------> * reset kicks in.
<------> */
<------>if (status & ABX8XX_STATUS_WDT)
<------><------>dev_alert(&client->dev, "watchdog timeout interrupt.\n");
 
<------>i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
 
<------>return IRQ_HANDLED;
}
 
static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>unsigned char buf[7];
 
<------>int irq_mask, err;
 
<------>if (client->irq <= 0)
<------><------>return -EINVAL;
 
<------>err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
<------><------><------><------><------>    sizeof(buf), buf);
<------>if (err)
<------><------>return err;
 
<------>irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
<------>if (irq_mask < 0)
<------><------>return irq_mask;
 
<------>t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
<------>t->time.tm_min = bcd2bin(buf[1] & 0x7F);
<------>t->time.tm_hour = bcd2bin(buf[2] & 0x3F);
<------>t->time.tm_mday = bcd2bin(buf[3] & 0x3F);
<------>t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1;
<------>t->time.tm_wday = buf[5] & 0x7;
 
<------>t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE);
<------>t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled;
 
<------>return err;
}
 
static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>u8 alarm[6];
<------>int err;
 
<------>if (client->irq <= 0)
<------><------>return -EINVAL;
 
<------>alarm[0] = 0x0;
<------>alarm[1] = bin2bcd(t->time.tm_sec);
<------>alarm[2] = bin2bcd(t->time.tm_min);
<------>alarm[3] = bin2bcd(t->time.tm_hour);
<------>alarm[4] = bin2bcd(t->time.tm_mday);
<------>alarm[5] = bin2bcd(t->time.tm_mon + 1);
 
<------>err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
<------><------><------><------><------>     sizeof(alarm), alarm);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to write alarm registers\n");
<------><------>return -EIO;
<------>}
 
<------>if (t->enabled) {
<------><------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
<------><------><------><------><------><------>(ABX8XX_IRQ_IM_1_4 |
<------><------><------><------><------><------> ABX8XX_IRQ_AIE));
<------><------>if (err)
<------><------><------>return err;
<------>}
 
<------>return 0;
}
 
static int abx80x_rtc_set_autocalibration(struct device *dev,
<------><------><------><------><------>  int autocalibration)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>int retval, flags = 0;
 
<------>if ((autocalibration != 0) && (autocalibration != 1024) &&
<------>    (autocalibration != 512)) {
<------><------>dev_err(dev, "autocalibration value outside permitted range\n");
<------><------>return -EINVAL;
<------>}
 
<------>flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
<------>if (flags < 0)
<------><------>return flags;
 
<------>if (autocalibration == 0) {
<------><------>flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
<------>} else if (autocalibration == 1024) {
<------><------>/* 1024 autocalibration is 0x10 */
<------><------>flags |= ABX8XX_OSC_ACAL_1024;
<------><------>flags &= ~(ABX8XX_OSC_ACAL_512);
<------>} else {
<------><------>/* 512 autocalibration is 0x11 */
<------><------>flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
<------>}
 
<------>/* Unlock write access to Oscillator Control Register */
<------>retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
<------><------><------><------><------>   ABX8XX_CFG_KEY_OSC);
<------>if (retval < 0) {
<------><------>dev_err(dev, "Failed to write CONFIG_KEY register\n");
<------><------>return retval;
<------>}
 
<------>retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
 
<------>return retval;
}
 
static int abx80x_rtc_get_autocalibration(struct device *dev)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>int flags = 0, autocalibration;
 
<------>flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
<------>if (flags < 0)
<------><------>return flags;
 
<------>if (flags & ABX8XX_OSC_ACAL_512)
<------><------>autocalibration = 512;
<------>else if (flags & ABX8XX_OSC_ACAL_1024)
<------><------>autocalibration = 1024;
<------>else
<------><------>autocalibration = 0;
 
<------>return autocalibration;
}
 
static ssize_t autocalibration_store(struct device *dev,
<------><------><------><------>     struct device_attribute *attr,
<------><------><------><------>     const char *buf, size_t count)
{
<------>int retval;
<------>unsigned long autocalibration = 0;
 
<------>retval = kstrtoul(buf, 10, &autocalibration);
<------>if (retval < 0) {
<------><------>dev_err(dev, "Failed to store RTC autocalibration attribute\n");
<------><------>return -EINVAL;
<------>}
 
<------>retval = abx80x_rtc_set_autocalibration(dev->parent, autocalibration);
 
<------>return retval ? retval : count;
}
 
static ssize_t autocalibration_show(struct device *dev,
<------><------><------><------>    struct device_attribute *attr, char *buf)
{
<------>int autocalibration = 0;
 
<------>autocalibration = abx80x_rtc_get_autocalibration(dev->parent);
<------>if (autocalibration < 0) {
<------><------>dev_err(dev, "Failed to read RTC autocalibration\n");
<------><------>sprintf(buf, "0\n");
<------><------>return autocalibration;
<------>}
 
<------>return sprintf(buf, "%d\n", autocalibration);
}
 
static DEVICE_ATTR_RW(autocalibration);
 
static ssize_t oscillator_store(struct device *dev,
<------><------><------><------>struct device_attribute *attr,
<------><------><------><------>const char *buf, size_t count)
{
<------>struct i2c_client *client = to_i2c_client(dev->parent);
<------>int retval, flags, rc_mode = 0;
 
<------>if (strncmp(buf, "rc", 2) == 0) {
<------><------>rc_mode = 1;
<------>} else if (strncmp(buf, "xtal", 4) == 0) {
<------><------>rc_mode = 0;
<------>} else {
<------><------>dev_err(dev, "Oscillator selection value outside permitted ones\n");
<------><------>return -EINVAL;
<------>}
 
<------>flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
<------>if (flags < 0)
<------><------>return flags;
 
<------>if (rc_mode == 0)
<------><------>flags &= ~(ABX8XX_OSC_OSEL);
<------>else
<------><------>flags |= (ABX8XX_OSC_OSEL);
 
<------>/* Unlock write access on Oscillator Control register */
<------>retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
<------><------><------><------><------>   ABX8XX_CFG_KEY_OSC);
<------>if (retval < 0) {
<------><------>dev_err(dev, "Failed to write CONFIG_KEY register\n");
<------><------>return retval;
<------>}
 
<------>retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
<------>if (retval < 0) {
<------><------>dev_err(dev, "Failed to write Oscillator Control register\n");
<------><------>return retval;
<------>}
 
<------>return retval ? retval : count;
}
 
static ssize_t oscillator_show(struct device *dev,
<------><------><------>       struct device_attribute *attr, char *buf)
{
<------>int rc_mode = 0;
<------>struct i2c_client *client = to_i2c_client(dev->parent);
 
<------>rc_mode = abx80x_is_rc_mode(client);
 
<------>if (rc_mode < 0) {
<------><------>dev_err(dev, "Failed to read RTC oscillator selection\n");
<------><------>sprintf(buf, "\n");
<------><------>return rc_mode;
<------>}
 
<------>if (rc_mode)
<------><------>return sprintf(buf, "rc\n");
<------>else
<------><------>return sprintf(buf, "xtal\n");
}
 
static DEVICE_ATTR_RW(oscillator);
 
static struct attribute *rtc_calib_attrs[] = {
<------>&dev_attr_autocalibration.attr,
<------>&dev_attr_oscillator.attr,
<------>NULL,
};
 
static const struct attribute_group rtc_calib_attr_group = {
<------>.attrs		= rtc_calib_attrs,
};
 
static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>int err;
 
<------>if (enabled)
<------><------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
<------><------><------><------><------><------>(ABX8XX_IRQ_IM_1_4 |
<------><------><------><------><------><------> ABX8XX_IRQ_AIE));
<------>else
<------><------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
<------><------><------><------><------><------>ABX8XX_IRQ_IM_1_4);
<------>return err;
}
 
static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
<------>struct i2c_client *client = to_i2c_client(dev);
<------>int status, tmp;
 
<------>switch (cmd) {
<------>case RTC_VL_READ:
<------><------>status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
<------><------>if (status < 0)
<------><------><------>return status;
 
<------><------>tmp = status & ABX8XX_STATUS_BLF ? RTC_VL_BACKUP_LOW : 0;
 
<------><------>return put_user(tmp, (unsigned int __user *)arg);
 
<------>case RTC_VL_CLR:
<------><------>status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
<------><------>if (status < 0)
<------><------><------>return status;
 
<------><------>status &= ~ABX8XX_STATUS_BLF;
 
<------><------>tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
<------><------>if (tmp < 0)
<------><------><------>return tmp;
 
<------><------>return 0;
 
<------>default:
<------><------>return -ENOIOCTLCMD;
<------>}
}
 
static const struct rtc_class_ops abx80x_rtc_ops = {
<------>.read_time	= abx80x_rtc_read_time,
<------>.set_time	= abx80x_rtc_set_time,
<------>.read_alarm	= abx80x_read_alarm,
<------>.set_alarm	= abx80x_set_alarm,
<------>.alarm_irq_enable = abx80x_alarm_irq_enable,
<------>.ioctl		= abx80x_ioctl,
};
 
static int abx80x_dt_trickle_cfg(struct i2c_client *client)
{
<------>struct device_node *np = client->dev.of_node;
<------>const char *diode;
<------>int trickle_cfg = 0;
<------>int i, ret;
<------>u32 tmp;
 
<------>ret = of_property_read_string(np, "abracon,tc-diode", &diode);
<------>if (ret)
<------><------>return ret;
 
<------>if (!strcmp(diode, "standard")) {
<------><------>trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE;
<------>} else if (!strcmp(diode, "schottky")) {
<------><------>trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
<------>} else {
<------><------>dev_dbg(&client->dev, "Invalid tc-diode value: %s\n", diode);
<------><------>return -EINVAL;
<------>}
 
<------>ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
<------>if (ret)
<------><------>return ret;
 
<------>for (i = 0; i < sizeof(trickle_resistors); i++)
<------><------>if (trickle_resistors[i] == tmp)
<------><------><------>break;
 
<------>if (i == sizeof(trickle_resistors)) {
<------><------>dev_dbg(&client->dev, "Invalid tc-resistor value: %u\n", tmp);
<------><------>return -EINVAL;
<------>}
 
<------>return (trickle_cfg | i);
}
 
#ifdef CONFIG_WATCHDOG
 
static inline u8 timeout_bits(unsigned int timeout)
{
<------>return ((timeout << ABX8XX_WDT_BMB_SHIFT) & ABX8XX_WDT_BMB_MASK) |
<------><------> ABX8XX_WDT_WRB_1HZ;
}
 
static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog,
<------><------><------><------>     unsigned int timeout)
{
<------>struct abx80x_priv *priv = watchdog_get_drvdata(wdog);
<------>u8 val = ABX8XX_WDT_WDS | timeout_bits(timeout);
 
<------>/*
<------> * Writing any timeout to the WDT register resets the watchdog timer.
<------> * Writing 0 disables it.
<------> */
<------>return i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_WDT, val);
}
 
static int abx80x_wdog_set_timeout(struct watchdog_device *wdog,
<------><------><------><------>   unsigned int new_timeout)
{
<------>int err = 0;
 
<------>if (watchdog_hw_running(wdog))
<------><------>err = __abx80x_wdog_set_timeout(wdog, new_timeout);
 
<------>if (err == 0)
<------><------>wdog->timeout = new_timeout;
 
<------>return err;
}
 
static int abx80x_wdog_ping(struct watchdog_device *wdog)
{
<------>return __abx80x_wdog_set_timeout(wdog, wdog->timeout);
}
 
static int abx80x_wdog_start(struct watchdog_device *wdog)
{
<------>return __abx80x_wdog_set_timeout(wdog, wdog->timeout);
}
 
static int abx80x_wdog_stop(struct watchdog_device *wdog)
{
<------>return __abx80x_wdog_set_timeout(wdog, 0);
}
 
static const struct watchdog_info abx80x_wdog_info = {
<------>.identity = "abx80x watchdog",
<------>.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
};
 
static const struct watchdog_ops abx80x_wdog_ops = {
<------>.owner = THIS_MODULE,
<------>.start = abx80x_wdog_start,
<------>.stop = abx80x_wdog_stop,
<------>.ping = abx80x_wdog_ping,
<------>.set_timeout = abx80x_wdog_set_timeout,
};
 
static int abx80x_setup_watchdog(struct abx80x_priv *priv)
{
<------>priv->wdog.parent = &priv->client->dev;
<------>priv->wdog.ops = &abx80x_wdog_ops;
<------>priv->wdog.info = &abx80x_wdog_info;
<------>priv->wdog.min_timeout = 1;
<------>priv->wdog.max_timeout = ABX8XX_WDT_MAX_TIME;
<------>priv->wdog.timeout = ABX8XX_WDT_MAX_TIME;
 
<------>watchdog_set_drvdata(&priv->wdog, priv);
 
<------>return devm_watchdog_register_device(&priv->client->dev, &priv->wdog);
}
#else
static int abx80x_setup_watchdog(struct abx80x_priv *priv)
{
<------>return 0;
}
#endif
 
static int abx80x_probe(struct i2c_client *client,
<------><------><------>const struct i2c_device_id *id)
{
<------>struct device_node *np = client->dev.of_node;
<------>struct abx80x_priv *priv;
<------>int i, data, err, trickle_cfg = -EINVAL;
<------>char buf[7];
<------>unsigned int part = id->driver_data;
<------>unsigned int partnumber;
<------>unsigned int majrev, minrev;
<------>unsigned int lot;
<------>unsigned int wafer;
<------>unsigned int uid;
 
<------>if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
<------><------>return -ENODEV;
 
<------>err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
<------><------><------><------><------>    sizeof(buf), buf);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to read partnumber\n");
<------><------>return -EIO;
<------>}
 
<------>partnumber = (buf[0] << 8) | buf[1];
<------>majrev = buf[2] >> 3;
<------>minrev = buf[2] & 0x7;
<------>lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3];
<------>uid = ((buf[4] & 0x7f) << 8) | buf[5];
<------>wafer = (buf[6] & 0x7c) >> 2;
<------>dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
<------><------> partnumber, majrev, minrev, lot, wafer, uid);
 
<------>data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
<------>if (data < 0) {
<------><------>dev_err(&client->dev, "Unable to read control register\n");
<------><------>return -EIO;
<------>}
 
<------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
<------><------><------><------><------>((data & ~(ABX8XX_CTRL_12_24 |
<------><------><------><------><------><------>   ABX8XX_CTRL_ARST)) |
<------><------><------><------><------> ABX8XX_CTRL_WRITE));
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "Unable to write control register\n");
<------><------>return -EIO;
<------>}
 
<------>/* Configure RV1805 specifics */
<------>if (part == RV1805) {
<------><------>/*
<------><------> * Avoid accidentally entering test mode. This can happen
<------><------> * on the RV1805 in case the reserved bit 5 in control2
<------><------> * register is set. RV-1805-C3 datasheet indicates that
<------><------> * the bit should be cleared in section 11h - Control2.
<------><------> */
<------><------>data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL2);
<------><------>if (data < 0) {
<------><------><------>dev_err(&client->dev,
<------><------><------><------>"Unable to read control2 register\n");
<------><------><------>return -EIO;
<------><------>}
 
<------><------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL2,
<------><------><------><------><------><------>data & ~ABX8XX_CTRL2_RSVD);
<------><------>if (err < 0) {
<------><------><------>dev_err(&client->dev,
<------><------><------><------>"Unable to write control2 register\n");
<------><------><------>return -EIO;
<------><------>}
 
<------><------>/*
<------><------> * Avoid extra power leakage. The RV1805 uses smaller
<------><------> * 10pin package and the EXTI input is not present.
<------><------> * Disable it to avoid leakage.
<------><------> */
<------><------>data = i2c_smbus_read_byte_data(client, ABX8XX_REG_OUT_CTRL);
<------><------>if (data < 0) {
<------><------><------>dev_err(&client->dev,
<------><------><------><------>"Unable to read output control register\n");
<------><------><------>return -EIO;
<------><------>}
 
<------><------>/*
<------><------> * Write the configuration key register to enable access to
<------><------> * the config2 register
<------><------> */
<------><------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
<------><------><------><------><------><------>ABX8XX_CFG_KEY_MISC);
<------><------>if (err < 0) {
<------><------><------>dev_err(&client->dev,
<------><------><------><------>"Unable to write configuration key\n");
<------><------><------>return -EIO;
<------><------>}
 
<------><------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OUT_CTRL,
<------><------><------><------><------><------>data | ABX8XX_OUT_CTRL_EXDS);
<------><------>if (err < 0) {
<------><------><------>dev_err(&client->dev,
<------><------><------><------>"Unable to write output control register\n");
<------><------><------>return -EIO;
<------><------>}
<------>}
 
<------>/* part autodetection */
<------>if (part == ABX80X) {
<------><------>for (i = 0; abx80x_caps[i].pn; i++)
<------><------><------>if (partnumber == abx80x_caps[i].pn)
<------><------><------><------>break;
<------><------>if (abx80x_caps[i].pn == 0) {
<------><------><------>dev_err(&client->dev, "Unknown part: %04x\n",
<------><------><------><------>partnumber);
<------><------><------>return -EINVAL;
<------><------>}
<------><------>part = i;
<------>}
 
<------>if (partnumber != abx80x_caps[part].pn) {
<------><------>dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
<------><------><------>partnumber, abx80x_caps[part].pn);
<------><------>return -EINVAL;
<------>}
 
<------>if (np && abx80x_caps[part].has_tc)
<------><------>trickle_cfg = abx80x_dt_trickle_cfg(client);
 
<------>if (trickle_cfg > 0) {
<------><------>dev_info(&client->dev, "Enabling trickle charger: %02x\n",
<------><------><------> trickle_cfg);
<------><------>abx80x_enable_trickle_charger(client, trickle_cfg);
<------>}
 
<------>err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
<------><------><------><------><------>BIT(2));
<------>if (err)
<------><------>return err;
 
<------>priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
<------>if (priv == NULL)
<------><------>return -ENOMEM;
 
<------>priv->rtc = devm_rtc_allocate_device(&client->dev);
<------>if (IS_ERR(priv->rtc))
<------><------>return PTR_ERR(priv->rtc);
 
<------>priv->rtc->ops = &abx80x_rtc_ops;
<------>priv->client = client;
 
<------>i2c_set_clientdata(client, priv);
 
<------>if (abx80x_caps[part].has_wdog) {
<------><------>err = abx80x_setup_watchdog(priv);
<------><------>if (err)
<------><------><------>return err;
<------>}
 
<------>if (client->irq > 0) {
<------><------>dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
<------><------>err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
<------><------><------><------><------><------>abx80x_handle_irq,
<------><------><------><------><------><------>IRQF_SHARED | IRQF_ONESHOT,
<------><------><------><------><------><------>"abx8xx",
<------><------><------><------><------><------>client);
<------><------>if (err) {
<------><------><------>dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
<------><------><------>client->irq = 0;
<------><------>}
<------>}
 
<------>err = rtc_add_group(priv->rtc, &rtc_calib_attr_group);
<------>if (err) {
<------><------>dev_err(&client->dev, "Failed to create sysfs group: %d\n",
<------><------><------>err);
<------><------>return err;
<------>}
 
<------>return rtc_register_device(priv->rtc);
}
 
static const struct i2c_device_id abx80x_id[] = {
<------>{ "abx80x", ABX80X },
<------>{ "ab0801", AB0801 },
<------>{ "ab0803", AB0803 },
<------>{ "ab0804", AB0804 },
<------>{ "ab0805", AB0805 },
<------>{ "ab1801", AB1801 },
<------>{ "ab1803", AB1803 },
<------>{ "ab1804", AB1804 },
<------>{ "ab1805", AB1805 },
<------>{ "rv1805", RV1805 },
<------>{ }
};
MODULE_DEVICE_TABLE(i2c, abx80x_id);
 
#ifdef CONFIG_OF
static const struct of_device_id abx80x_of_match[] = {
<------>{
<------><------>.compatible = "abracon,abx80x",
<------><------>.data = (void *)ABX80X
<------>},
<------>{
<------><------>.compatible = "abracon,ab0801",
<------><------>.data = (void *)AB0801
<------>},
<------>{
<------><------>.compatible = "abracon,ab0803",
<------><------>.data = (void *)AB0803
<------>},
<------>{
<------><------>.compatible = "abracon,ab0804",
<------><------>.data = (void *)AB0804
<------>},
<------>{
<------><------>.compatible = "abracon,ab0805",
<------><------>.data = (void *)AB0805
<------>},
<------>{
<------><------>.compatible = "abracon,ab1801",
<------><------>.data = (void *)AB1801
<------>},
<------>{
<------><------>.compatible = "abracon,ab1803",
<------><------>.data = (void *)AB1803
<------>},
<------>{
<------><------>.compatible = "abracon,ab1804",
<------><------>.data = (void *)AB1804
<------>},
<------>{
<------><------>.compatible = "abracon,ab1805",
<------><------>.data = (void *)AB1805
<------>},
<------>{
<------><------>.compatible = "microcrystal,rv1805",
<------><------>.data = (void *)RV1805
<------>},
<------>{ }
};
MODULE_DEVICE_TABLE(of, abx80x_of_match);
#endif
 
static struct i2c_driver abx80x_driver = {
<------>.driver		= {
<------><------>.name	= "rtc-abx80x",
<------><------>.of_match_table = of_match_ptr(abx80x_of_match),
<------>},
<------>.probe		= abx80x_probe,
<------>.id_table	= abx80x_id,
};
 
module_i2c_driver(abx80x_driver);
 
MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
MODULE_LICENSE("GPL v2");