summaryrefslogtreecommitdiffstats
path: root/drivers/rtc/rtc-abx80x.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--drivers/rtc/rtc-abx80x.c926
1 files changed, 926 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
new file mode 100644
index 000000000..9b0138d07
--- /dev/null
+++ b/drivers/rtc/rtc-abx80x.c
@@ -0,0 +1,926 @@
+// 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_write_config_key(struct i2c_client *client, u8 key)
+{
+ if (i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, key) < 0) {
+ dev_err(&client->dev, "Unable to write configuration key\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+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
+ */
+ if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
+ 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 */
+ if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
+ return -EIO;
+
+ 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 */
+ if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
+ return -EIO;
+
+ 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
+ */
+ if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
+ 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 devm_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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 14:01:13 +0000