+++ /dev/null
-From bb0e317bfc453877805a12f975490ad38b6413f1 Mon Sep 17 00:00:00 2001
-From: Alexandre Belloni <alexandre.belloni@bootlin.com>
-Date: Wed, 13 Feb 2019 00:21:36 +0100
-Subject: [PATCH] rtc: rv3028: add new driver
-
-upstream commit e6e7376cfd7b3f9b63de3a22792f64d9bfb2ab53.
-
-Add a driver for the MicroCrystal RV-3028. It is a SMT Real-Time Clock
-Module that incorporates an integrated CMOS circuit together with an XTAL.
-It has an i2c interface.
-
-The driver handles date/time, alarms, trickle charging, timestamping,
-frequency offset correction, EEPROM and NVRAM.
-
-Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
----
- Documentation/devicetree/bindings/rtc/rtc.txt | 69 ++
- drivers/rtc/Kconfig | 9 +
- drivers/rtc/Makefile | 1 +
- drivers/rtc/rtc-rv3028.c | 733 ++++++++++++++++++
- 4 files changed, 812 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/rtc/rtc.txt
- create mode 100644 drivers/rtc/rtc-rv3028.c
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/rtc/rtc.txt
-@@ -0,0 +1,69 @@
-+Generic device tree bindings for Real Time Clock devices
-+========================================================
-+
-+This document describes generic bindings which can be used to describe Real Time
-+Clock devices in a device tree.
-+
-+Required properties
-+-------------------
-+
-+- compatible : name of RTC device following generic names recommended practice.
-+
-+For other required properties e.g. to describe register sets,
-+clocks, etc. check the binding documentation of the specific driver.
-+
-+Optional properties
-+-------------------
-+
-+- start-year : if provided, the default hardware range supported by the RTC is
-+ shifted so the first usable year is the specified one.
-+
-+The following properties may not be supported by all drivers. However, if a
-+driver wants to support one of the below features, it should adapt the bindings
-+below.
-+- trickle-resistor-ohms : Selected resistor for trickle charger. Should be given
-+ if trickle charger should be enabled
-+- trickle-diode-disable : Do not use internal trickle charger diode Should be
-+ given if internal trickle charger diode should be
-+ disabled
-+- wakeup-source : Enables wake up of host system on alarm
-+- quartz-load-femtofarads : The capacitive load of the quartz(x-tal),
-+ expressed in femto Farad (fF).
-+ The default value shall be listed (if optional),
-+ and likewise all valid values.
-+
-+Trivial RTCs
-+------------
-+
-+This is a list of trivial RTC devices that have simple device tree
-+bindings, consisting only of a compatible field, an address and
-+possibly an interrupt line.
-+
-+
-+Compatible Vendor / Chip
-+========== =============
-+abracon,abb5zes3 AB-RTCMC-32.768kHz-B5ZE-S3: Real Time Clock/Calendar Module with I2C Interface
-+dallas,ds1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
-+dallas,ds1672 Dallas DS1672 Real-time Clock
-+dallas,ds3232 Extremely Accurate I²C RTC with Integrated Crystal and SRAM
-+epson,rx8010 I2C-BUS INTERFACE REAL TIME CLOCK MODULE
-+epson,rx8581 I2C-BUS INTERFACE REAL TIME CLOCK MODULE
-+emmicro,em3027 EM Microelectronic EM3027 Real-time Clock
-+isil,isl1208 Intersil ISL1208 Low Power RTC with Battery Backed SRAM
-+isil,isl1218 Intersil ISL1218 Low Power RTC with Battery Backed SRAM
-+isil,isl12022 Intersil ISL12022 Real-time Clock
-+microcrystal,rv3028 Real Time Clock Module with I2C-Bus
-+microcrystal,rv3029 Real Time Clock Module with I2C-Bus
-+microcrystal,rv8523 Real Time Clock
-+nxp,pcf2127 Real-time clock
-+nxp,pcf2129 Real-time clock
-+nxp,pcf8563 Real-time clock/calendar
-+pericom,pt7c4338 Real-time Clock Module
-+ricoh,r2025sd I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
-+ricoh,r2221tl I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
-+ricoh,rs5c372a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
-+ricoh,rs5c372b I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
-+ricoh,rv5c386 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
-+ricoh,rv5c387a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
-+sii,s35390a 2-wire CMOS real-time clock
-+whwave,sd3078 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
---- a/drivers/rtc/Kconfig
-+++ b/drivers/rtc/Kconfig
-@@ -625,6 +625,15 @@ config RTC_DRV_EM3027
- This driver can also be built as a module. If so, the module
- will be called rtc-em3027.
-
-+config RTC_DRV_RV3028
-+ tristate "Micro Crystal RV3028"
-+ help
-+ If you say yes here you get support for the Micro Crystal
-+ RV3028.
-+
-+ This driver can also be built as a module. If so, the module
-+ will be called rtc-rv3028.
-+
- config RTC_DRV_RV8803
- tristate "Micro Crystal RV8803, Epson RX8900"
- help
---- a/drivers/rtc/Makefile
-+++ b/drivers/rtc/Makefile
-@@ -136,6 +136,7 @@ obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5
- obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
- obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
- obj-$(CONFIG_RTC_DRV_RTD119X) += rtc-rtd119x.o
-+obj-$(CONFIG_RTC_DRV_RV3028) += rtc-rv3028.o
- obj-$(CONFIG_RTC_DRV_RV3029C2) += rtc-rv3029c2.o
- obj-$(CONFIG_RTC_DRV_RV8803) += rtc-rv8803.o
- obj-$(CONFIG_RTC_DRV_RX4581) += rtc-rx4581.o
---- /dev/null
-+++ b/drivers/rtc/rtc-rv3028.c
-@@ -0,0 +1,733 @@
-+// SPDX-License-Identifier: GPL-2.0
-+/*
-+ * RTC driver for the Micro Crystal RV3028
-+ *
-+ * Copyright (C) 2019 Micro Crystal SA
-+ *
-+ * Alexandre Belloni <alexandre.belloni@bootlin.com>
-+ *
-+ */
-+
-+#include <linux/bcd.h>
-+#include <linux/bitops.h>
-+#include <linux/i2c.h>
-+#include <linux/interrupt.h>
-+#include <linux/kernel.h>
-+#include <linux/log2.h>
-+#include <linux/module.h>
-+#include <linux/of_device.h>
-+#include <linux/regmap.h>
-+#include <linux/rtc.h>
-+#include "rtc-core.h"
-+
-+#define RV3028_SEC 0x00
-+#define RV3028_MIN 0x01
-+#define RV3028_HOUR 0x02
-+#define RV3028_WDAY 0x03
-+#define RV3028_DAY 0x04
-+#define RV3028_MONTH 0x05
-+#define RV3028_YEAR 0x06
-+#define RV3028_ALARM_MIN 0x07
-+#define RV3028_ALARM_HOUR 0x08
-+#define RV3028_ALARM_DAY 0x09
-+#define RV3028_STATUS 0x0E
-+#define RV3028_CTRL1 0x0F
-+#define RV3028_CTRL2 0x10
-+#define RV3028_EVT_CTRL 0x13
-+#define RV3028_TS_COUNT 0x14
-+#define RV3028_TS_SEC 0x15
-+#define RV3028_RAM1 0x1F
-+#define RV3028_EEPROM_ADDR 0x25
-+#define RV3028_EEPROM_DATA 0x26
-+#define RV3028_EEPROM_CMD 0x27
-+#define RV3028_CLKOUT 0x35
-+#define RV3028_OFFSET 0x36
-+#define RV3028_BACKUP 0x37
-+
-+#define RV3028_STATUS_PORF BIT(0)
-+#define RV3028_STATUS_EVF BIT(1)
-+#define RV3028_STATUS_AF BIT(2)
-+#define RV3028_STATUS_TF BIT(3)
-+#define RV3028_STATUS_UF BIT(4)
-+#define RV3028_STATUS_BSF BIT(5)
-+#define RV3028_STATUS_CLKF BIT(6)
-+#define RV3028_STATUS_EEBUSY BIT(7)
-+
-+#define RV3028_CTRL1_EERD BIT(3)
-+#define RV3028_CTRL1_WADA BIT(5)
-+
-+#define RV3028_CTRL2_RESET BIT(0)
-+#define RV3028_CTRL2_12_24 BIT(1)
-+#define RV3028_CTRL2_EIE BIT(2)
-+#define RV3028_CTRL2_AIE BIT(3)
-+#define RV3028_CTRL2_TIE BIT(4)
-+#define RV3028_CTRL2_UIE BIT(5)
-+#define RV3028_CTRL2_TSE BIT(7)
-+
-+#define RV3028_EVT_CTRL_TSR BIT(2)
-+
-+#define RV3028_EEPROM_CMD_WRITE 0x21
-+#define RV3028_EEPROM_CMD_READ 0x22
-+
-+#define RV3028_EEBUSY_POLL 10000
-+#define RV3028_EEBUSY_TIMEOUT 100000
-+
-+#define RV3028_BACKUP_TCE BIT(5)
-+#define RV3028_BACKUP_TCR_MASK GENMASK(1,0)
-+
-+#define OFFSET_STEP_PPT 953674
-+
-+enum rv3028_type {
-+ rv_3028,
-+};
-+
-+struct rv3028_data {
-+ struct regmap *regmap;
-+ struct rtc_device *rtc;
-+ enum rv3028_type type;
-+};
-+
-+static u16 rv3028_trickle_resistors[] = {1000, 3000, 6000, 11000};
-+
-+static ssize_t timestamp0_store(struct device *dev,
-+ struct device_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
-+
-+ regmap_update_bits(rv3028->regmap, RV3028_EVT_CTRL, RV3028_EVT_CTRL_TSR,
-+ RV3028_EVT_CTRL_TSR);
-+
-+ return count;
-+};
-+
-+static ssize_t timestamp0_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
-+ struct rtc_time tm;
-+ int ret, count;
-+ u8 date[6];
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
-+ if (ret)
-+ return ret;
-+
-+ if (!count)
-+ return 0;
-+
-+ ret = regmap_bulk_read(rv3028->regmap, RV3028_TS_SEC, date,
-+ sizeof(date));
-+ if (ret)
-+ return ret;
-+
-+ tm.tm_sec = bcd2bin(date[0]);
-+ tm.tm_min = bcd2bin(date[1]);
-+ tm.tm_hour = bcd2bin(date[2]);
-+ tm.tm_mday = bcd2bin(date[3]);
-+ tm.tm_mon = bcd2bin(date[4]) - 1;
-+ tm.tm_year = bcd2bin(date[5]) + 100;
-+
-+ ret = rtc_valid_tm(&tm);
-+ if (ret)
-+ return ret;
-+
-+ return sprintf(buf, "%llu\n",
-+ (unsigned long long)rtc_tm_to_time64(&tm));
-+};
-+
-+static DEVICE_ATTR_RW(timestamp0);
-+
-+static ssize_t timestamp0_count_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
-+ int ret, count;
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
-+ if (ret)
-+ return ret;
-+
-+ return sprintf(buf, "%u\n", count);
-+};
-+
-+static DEVICE_ATTR_RO(timestamp0_count);
-+
-+static struct attribute *rv3028_attrs[] = {
-+ &dev_attr_timestamp0.attr,
-+ &dev_attr_timestamp0_count.attr,
-+ NULL
-+};
-+
-+static const struct attribute_group rv3028_attr_group = {
-+ .attrs = rv3028_attrs,
-+};
-+
-+static irqreturn_t rv3028_handle_irq(int irq, void *dev_id)
-+{
-+ struct rv3028_data *rv3028 = dev_id;
-+ unsigned long events = 0;
-+ u32 status = 0, ctrl = 0;
-+
-+ if (regmap_read(rv3028->regmap, RV3028_STATUS, &status) < 0 ||
-+ status == 0) {
-+ return IRQ_NONE;
-+ }
-+
-+ if (status & RV3028_STATUS_PORF)
-+ dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n");
-+
-+ if (status & RV3028_STATUS_TF) {
-+ status |= RV3028_STATUS_TF;
-+ ctrl |= RV3028_CTRL2_TIE;
-+ events |= RTC_PF;
-+ }
-+
-+ if (status & RV3028_STATUS_AF) {
-+ status |= RV3028_STATUS_AF;
-+ ctrl |= RV3028_CTRL2_AIE;
-+ events |= RTC_AF;
-+ }
-+
-+ if (status & RV3028_STATUS_UF) {
-+ status |= RV3028_STATUS_UF;
-+ ctrl |= RV3028_CTRL2_UIE;
-+ events |= RTC_UF;
-+ }
-+
-+ if (events) {
-+ rtc_update_irq(rv3028->rtc, 1, events);
-+ regmap_update_bits(rv3028->regmap, RV3028_STATUS, status, 0);
-+ regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ctrl, 0);
-+ }
-+
-+ if (status & RV3028_STATUS_EVF) {
-+ sysfs_notify(&rv3028->rtc->dev.kobj, NULL,
-+ dev_attr_timestamp0.attr.name);
-+ dev_warn(&rv3028->rtc->dev, "event detected");
-+ }
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static int rv3028_get_time(struct device *dev, struct rtc_time *tm)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ u8 date[7];
-+ int ret, status;
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
-+ if (ret < 0)
-+ return ret;
-+
-+ if (status & RV3028_STATUS_PORF) {
-+ dev_warn(dev, "Voltage low, data is invalid.\n");
-+ return -EINVAL;
-+ }
-+
-+ ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date));
-+ if (ret)
-+ return ret;
-+
-+ tm->tm_sec = bcd2bin(date[RV3028_SEC] & 0x7f);
-+ tm->tm_min = bcd2bin(date[RV3028_MIN] & 0x7f);
-+ tm->tm_hour = bcd2bin(date[RV3028_HOUR] & 0x3f);
-+ tm->tm_wday = ilog2(date[RV3028_WDAY] & 0x7f);
-+ tm->tm_mday = bcd2bin(date[RV3028_DAY] & 0x3f);
-+ tm->tm_mon = bcd2bin(date[RV3028_MONTH] & 0x1f) - 1;
-+ tm->tm_year = bcd2bin(date[RV3028_YEAR]) + 100;
-+
-+ return 0;
-+}
-+
-+static int rv3028_set_time(struct device *dev, struct rtc_time *tm)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ u8 date[7];
-+ int ret;
-+
-+ date[RV3028_SEC] = bin2bcd(tm->tm_sec);
-+ date[RV3028_MIN] = bin2bcd(tm->tm_min);
-+ date[RV3028_HOUR] = bin2bcd(tm->tm_hour);
-+ date[RV3028_WDAY] = 1 << (tm->tm_wday);
-+ date[RV3028_DAY] = bin2bcd(tm->tm_mday);
-+ date[RV3028_MONTH] = bin2bcd(tm->tm_mon + 1);
-+ date[RV3028_YEAR] = bin2bcd(tm->tm_year - 100);
-+
-+ /*
-+ * Writing to the Seconds register has the same effect as setting RESET
-+ * bit to 1
-+ */
-+ ret = regmap_bulk_write(rv3028->regmap, RV3028_SEC, date,
-+ sizeof(date));
-+ if (ret)
-+ return ret;
-+
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
-+ RV3028_STATUS_PORF, 0);
-+
-+ return ret;
-+}
-+
-+static int rv3028_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ u8 alarmvals[3];
-+ int status, ctrl, ret;
-+
-+ ret = regmap_bulk_read(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
-+ sizeof(alarmvals));
-+ if (ret)
-+ return ret;
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
-+ if (ret < 0)
-+ return ret;
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_CTRL2, &ctrl);
-+ if (ret < 0)
-+ return ret;
-+
-+ alrm->time.tm_sec = 0;
-+ alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
-+ alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
-+ alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
-+
-+ alrm->enabled = !!(ctrl & RV3028_CTRL2_AIE);
-+ alrm->pending = (status & RV3028_STATUS_AF) && alrm->enabled;
-+
-+ return 0;
-+}
-+
-+static int rv3028_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ u8 alarmvals[3];
-+ u8 ctrl = 0;
-+ int ret;
-+
-+ /* The alarm has no seconds, round up to nearest minute */
-+ if (alrm->time.tm_sec) {
-+ time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
-+
-+ alarm_time += 60 - alrm->time.tm_sec;
-+ rtc_time64_to_tm(alarm_time, &alrm->time);
-+ }
-+
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
-+ RV3028_CTRL2_AIE | RV3028_CTRL2_UIE, 0);
-+ if (ret)
-+ return ret;
-+
-+ alarmvals[0] = bin2bcd(alrm->time.tm_min);
-+ alarmvals[1] = bin2bcd(alrm->time.tm_hour);
-+ alarmvals[2] = bin2bcd(alrm->time.tm_mday);
-+
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
-+ RV3028_STATUS_AF, 0);
-+ if (ret)
-+ return ret;
-+
-+ ret = regmap_bulk_write(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
-+ sizeof(alarmvals));
-+ if (ret)
-+ return ret;
-+
-+ if (alrm->enabled) {
-+ if (rv3028->rtc->uie_rtctimer.enabled)
-+ ctrl |= RV3028_CTRL2_UIE;
-+ if (rv3028->rtc->aie_timer.enabled)
-+ ctrl |= RV3028_CTRL2_AIE;
-+ }
-+
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
-+ RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
-+
-+ return ret;
-+}
-+
-+static int rv3028_alarm_irq_enable(struct device *dev, unsigned int enabled)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ int ctrl = 0, ret;
-+
-+ if (enabled) {
-+ if (rv3028->rtc->uie_rtctimer.enabled)
-+ ctrl |= RV3028_CTRL2_UIE;
-+ if (rv3028->rtc->aie_timer.enabled)
-+ ctrl |= RV3028_CTRL2_AIE;
-+ }
-+
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
-+ RV3028_STATUS_AF | RV3028_STATUS_UF, 0);
-+ if (ret)
-+ return ret;
-+
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
-+ RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
-+ if (ret)
-+ return ret;
-+
-+ return 0;
-+}
-+
-+static int rv3028_read_offset(struct device *dev, long *offset)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ int ret, value, steps;
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_OFFSET, &value);
-+ if (ret < 0)
-+ return ret;
-+
-+ steps = sign_extend32(value << 1, 8);
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value);
-+ if (ret < 0)
-+ return ret;
-+
-+ steps += value >> 7;
-+
-+ *offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000);
-+
-+ return 0;
-+}
-+
-+static int rv3028_set_offset(struct device *dev, long offset)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ int ret;
-+
-+ offset = clamp(offset, -244141L, 243187L) * 1000;
-+ offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT);
-+
-+ ret = regmap_write(rv3028->regmap, RV3028_OFFSET, offset >> 1);
-+ if (ret < 0)
-+ return ret;
-+
-+ return regmap_update_bits(rv3028->regmap, RV3028_BACKUP, BIT(7),
-+ offset << 7);
-+}
-+
-+static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
-+{
-+ struct rv3028_data *rv3028 = dev_get_drvdata(dev);
-+ int status, ret = 0;
-+
-+ switch (cmd) {
-+ case RTC_VL_READ:
-+ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
-+ if (ret < 0)
-+ return ret;
-+
-+ if (status & RV3028_STATUS_PORF)
-+ dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n");
-+
-+ status &= RV3028_STATUS_PORF;
-+
-+ if (copy_to_user((void __user *)arg, &status, sizeof(int)))
-+ return -EFAULT;
-+
-+ return 0;
-+
-+ case RTC_VL_CLR:
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
-+ RV3028_STATUS_PORF, 0);
-+
-+ return ret;
-+
-+ default:
-+ return -ENOIOCTLCMD;
-+ }
-+}
-+
-+static int rv3028_nvram_write(void *priv, unsigned int offset, void *val,
-+ size_t bytes)
-+{
-+ return regmap_bulk_write(priv, RV3028_RAM1 + offset, val, bytes);
-+}
-+
-+static int rv3028_nvram_read(void *priv, unsigned int offset, void *val,
-+ size_t bytes)
-+{
-+ return regmap_bulk_read(priv, RV3028_RAM1 + offset, val, bytes);
-+}
-+
-+static int rv3028_eeprom_write(void *priv, unsigned int offset, void *val,
-+ size_t bytes)
-+{
-+ u32 status, ctrl1;
-+ int i, ret, err;
-+ u8 *buf = val;
-+
-+ ret = regmap_read(priv, RV3028_CTRL1, &ctrl1);
-+ if (ret)
-+ return ret;
-+
-+ if (!(ctrl1 & RV3028_CTRL1_EERD)) {
-+ ret = regmap_update_bits(priv, RV3028_CTRL1,
-+ RV3028_CTRL1_EERD, RV3028_CTRL1_EERD);
-+ if (ret)
-+ return ret;
-+
-+ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
-+ !(status & RV3028_STATUS_EEBUSY),
-+ RV3028_EEBUSY_POLL,
-+ RV3028_EEBUSY_TIMEOUT);
-+ if (ret)
-+ goto restore_eerd;
-+ }
-+
-+ for (i = 0; i < bytes; i++) {
-+ ret = regmap_write(priv, RV3028_EEPROM_ADDR, offset + i);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ ret = regmap_write(priv, RV3028_EEPROM_DATA, buf[i]);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ ret = regmap_write(priv, RV3028_EEPROM_CMD,
-+ RV3028_EEPROM_CMD_WRITE);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ usleep_range(RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
-+
-+ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
-+ !(status & RV3028_STATUS_EEBUSY),
-+ RV3028_EEBUSY_POLL,
-+ RV3028_EEBUSY_TIMEOUT);
-+ if (ret)
-+ goto restore_eerd;
-+ }
-+
-+restore_eerd:
-+ if (!(ctrl1 & RV3028_CTRL1_EERD))
-+ {
-+ err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD,
-+ 0);
-+ if (err && !ret)
-+ ret = err;
-+ }
-+
-+ return ret;
-+}
-+
-+static int rv3028_eeprom_read(void *priv, unsigned int offset, void *val,
-+ size_t bytes)
-+{
-+ u32 status, ctrl1, data;
-+ int i, ret, err;
-+ u8 *buf = val;
-+
-+ ret = regmap_read(priv, RV3028_CTRL1, &ctrl1);
-+ if (ret)
-+ return ret;
-+
-+ if (!(ctrl1 & RV3028_CTRL1_EERD)) {
-+ ret = regmap_update_bits(priv, RV3028_CTRL1,
-+ RV3028_CTRL1_EERD, RV3028_CTRL1_EERD);
-+ if (ret)
-+ return ret;
-+
-+ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
-+ !(status & RV3028_STATUS_EEBUSY),
-+ RV3028_EEBUSY_POLL,
-+ RV3028_EEBUSY_TIMEOUT);
-+ if (ret)
-+ goto restore_eerd;
-+ }
-+
-+ for (i = 0; i < bytes; i++) {
-+ ret = regmap_write(priv, RV3028_EEPROM_ADDR, offset + i);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ ret = regmap_write(priv, RV3028_EEPROM_CMD,
-+ RV3028_EEPROM_CMD_READ);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
-+ !(status & RV3028_STATUS_EEBUSY),
-+ RV3028_EEBUSY_POLL,
-+ RV3028_EEBUSY_TIMEOUT);
-+ if (ret)
-+ goto restore_eerd;
-+
-+ ret = regmap_read(priv, RV3028_EEPROM_DATA, &data);
-+ if (ret)
-+ goto restore_eerd;
-+ buf[i] = data;
-+ }
-+
-+restore_eerd:
-+ if (!(ctrl1 & RV3028_CTRL1_EERD))
-+ {
-+ err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD,
-+ 0);
-+ if (err && !ret)
-+ ret = err;
-+ }
-+
-+ return ret;
-+}
-+
-+static struct rtc_class_ops rv3028_rtc_ops = {
-+ .read_time = rv3028_get_time,
-+ .set_time = rv3028_set_time,
-+ .read_offset = rv3028_read_offset,
-+ .set_offset = rv3028_set_offset,
-+ .ioctl = rv3028_ioctl,
-+};
-+
-+static const struct regmap_config regmap_config = {
-+ .reg_bits = 8,
-+ .val_bits = 8,
-+ .max_register = 0x37,
-+};
-+
-+static int rv3028_probe(struct i2c_client *client)
-+{
-+ struct rv3028_data *rv3028;
-+ int ret, status;
-+ u32 ohms;
-+ struct nvmem_config nvmem_cfg = {
-+ .name = "rv3028_nvram",
-+ .word_size = 1,
-+ .stride = 1,
-+ .size = 2,
-+ .type = NVMEM_TYPE_BATTERY_BACKED,
-+ .reg_read = rv3028_nvram_read,
-+ .reg_write = rv3028_nvram_write,
-+ };
-+ struct nvmem_config eeprom_cfg = {
-+ .name = "rv3028_eeprom",
-+ .word_size = 1,
-+ .stride = 1,
-+ .size = 43,
-+ .type = NVMEM_TYPE_EEPROM,
-+ .reg_read = rv3028_eeprom_read,
-+ .reg_write = rv3028_eeprom_write,
-+ };
-+
-+ rv3028 = devm_kzalloc(&client->dev, sizeof(struct rv3028_data),
-+ GFP_KERNEL);
-+ if (!rv3028)
-+ return -ENOMEM;
-+
-+ rv3028->regmap = devm_regmap_init_i2c(client, ®map_config);
-+
-+ i2c_set_clientdata(client, rv3028);
-+
-+ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
-+ if (ret < 0)
-+ return ret;
-+
-+ if (status & RV3028_STATUS_PORF)
-+ dev_warn(&client->dev, "Voltage low, data loss detected.\n");
-+
-+ if (status & RV3028_STATUS_AF)
-+ dev_warn(&client->dev, "An alarm may have been missed.\n");
-+
-+ rv3028->rtc = devm_rtc_allocate_device(&client->dev);
-+ if (IS_ERR(rv3028->rtc)) {
-+ return PTR_ERR(rv3028->rtc);
-+ }
-+
-+ if (client->irq > 0) {
-+ ret = devm_request_threaded_irq(&client->dev, client->irq,
-+ NULL, rv3028_handle_irq,
-+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-+ "rv3028", rv3028);
-+ if (ret) {
-+ dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
-+ client->irq = 0;
-+ } else {
-+ rv3028_rtc_ops.read_alarm = rv3028_get_alarm;
-+ rv3028_rtc_ops.set_alarm = rv3028_set_alarm;
-+ rv3028_rtc_ops.alarm_irq_enable = rv3028_alarm_irq_enable;
-+ }
-+ }
-+
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1,
-+ RV3028_CTRL1_WADA, RV3028_CTRL1_WADA);
-+ if (ret)
-+ return ret;
-+
-+ /* setup timestamping */
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
-+ RV3028_CTRL2_EIE | RV3028_CTRL2_TSE,
-+ RV3028_CTRL2_EIE | RV3028_CTRL2_TSE);
-+ if (ret)
-+ return ret;
-+
-+ /* setup trickle charger */
-+ if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms",
-+ &ohms)) {
-+ int i;
-+
-+ for (i = 0; i < ARRAY_SIZE(rv3028_trickle_resistors); i++)
-+ if (ohms == rv3028_trickle_resistors[i])
-+ break;
-+
-+ if (i < ARRAY_SIZE(rv3028_trickle_resistors)) {
-+ ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP,
-+ RV3028_BACKUP_TCE |
-+ RV3028_BACKUP_TCR_MASK,
-+ RV3028_BACKUP_TCE | i);
-+ if (ret)
-+ return ret;
-+ } else {
-+ dev_warn(&client->dev, "invalid trickle resistor value\n");
-+ }
-+ }
-+
-+ ret = rtc_add_group(rv3028->rtc, &rv3028_attr_group);
-+ if (ret)
-+ return ret;
-+
-+ rv3028->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
-+ rv3028->rtc->range_max = RTC_TIMESTAMP_END_2099;
-+ rv3028->rtc->ops = &rv3028_rtc_ops;
-+ ret = rtc_register_device(rv3028->rtc);
-+ if (ret)
-+ return ret;
-+
-+ nvmem_cfg.priv = rv3028->regmap;
-+ rtc_nvmem_register(rv3028->rtc, &nvmem_cfg);
-+ eeprom_cfg.priv = rv3028->regmap;
-+ rtc_nvmem_register(rv3028->rtc, &eeprom_cfg);
-+
-+ rv3028->rtc->max_user_freq = 1;
-+
-+ return 0;
-+}
-+
-+static const struct of_device_id rv3028_of_match[] = {
-+ { .compatible = "microcrystal,rv3028", },
-+ { }
-+};
-+MODULE_DEVICE_TABLE(of, rv3028_of_match);
-+
-+static struct i2c_driver rv3028_driver = {
-+ .driver = {
-+ .name = "rtc-rv3028",
-+ .of_match_table = of_match_ptr(rv3028_of_match),
-+ },
-+ .probe_new = rv3028_probe,
-+};
-+module_i2c_driver(rv3028_driver);
-+
-+MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
-+MODULE_DESCRIPTION("Micro Crystal RV3028 RTC driver");
-+MODULE_LICENSE("GPL v2");
projects / openwrt / openwrt.git / blobdiff