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Release 4.14 drivers/rtc/rtc-em3027.c

Directory: drivers/rtc
/*
 * An rtc/i2c driver for the EM Microelectronic EM3027
 * Copyright 2011 CompuLab, Ltd.
 *
 * Author: Mike Rapoport <mike@compulab.co.il>
 *
 * Based on rtc-ds1672.c by Alessandro Zummo <a.zummo@towertech.it>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/i2c.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/module.h>
#include <linux/of.h>

/* Registers */

#define EM3027_REG_ON_OFF_CTRL	0x00

#define EM3027_REG_IRQ_CTRL	0x01

#define EM3027_REG_IRQ_FLAGS	0x02

#define EM3027_REG_STATUS	0x03

#define EM3027_REG_RST_CTRL	0x04


#define EM3027_REG_WATCH_SEC	0x08

#define EM3027_REG_WATCH_MIN	0x09

#define EM3027_REG_WATCH_HOUR	0x0a

#define EM3027_REG_WATCH_DATE	0x0b

#define EM3027_REG_WATCH_DAY	0x0c

#define EM3027_REG_WATCH_MON	0x0d

#define EM3027_REG_WATCH_YEAR	0x0e


#define EM3027_REG_ALARM_SEC	0x10

#define EM3027_REG_ALARM_MIN	0x11

#define EM3027_REG_ALARM_HOUR	0x12

#define EM3027_REG_ALARM_DATE	0x13

#define EM3027_REG_ALARM_DAY	0x14

#define EM3027_REG_ALARM_MON	0x15

#define EM3027_REG_ALARM_YEAR	0x16


static struct i2c_driver em3027_driver;


static int em3027_get_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); unsigned char addr = EM3027_REG_WATCH_SEC; unsigned char buf[7]; struct i2c_msg msgs[] = { {/* setup read addr */ .addr = client->addr, .len = 1, .buf = &addr }, {/* read time/date */ .addr = client->addr, .flags = I2C_M_RD, .len = 7, .buf = buf }, }; /* read time/date registers */ if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { dev_err(&client->dev, "%s: read error\n", __func__); return -EIO; } tm->tm_sec = bcd2bin(buf[0]); tm->tm_min = bcd2bin(buf[1]); tm->tm_hour = bcd2bin(buf[2]); tm->tm_mday = bcd2bin(buf[3]); tm->tm_wday = bcd2bin(buf[4]); tm->tm_mon = bcd2bin(buf[5]); tm->tm_year = bcd2bin(buf[6]) + 100; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Rapoport19789.14%150.00%
Shubhrajyoti Datta2410.86%150.00%
Total221100.00%2100.00%


static int em3027_set_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); unsigned char buf[8]; struct i2c_msg msg = { .addr = client->addr, .len = 8, .buf = buf, /* write time/date */ }; buf[0] = EM3027_REG_WATCH_SEC; buf[1] = bin2bcd(tm->tm_sec); buf[2] = bin2bcd(tm->tm_min); buf[3] = bin2bcd(tm->tm_hour); buf[4] = bin2bcd(tm->tm_mday); buf[5] = bin2bcd(tm->tm_wday); buf[6] = bin2bcd(tm->tm_mon); buf[7] = bin2bcd(tm->tm_year % 100); /* write time/date registers */ if ((i2c_transfer(client->adapter, &msg, 1)) != 1) { dev_err(&client->dev, "%s: write error\n", __func__); return -EIO; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Rapoport18295.29%150.00%
Shubhrajyoti Datta94.71%150.00%
Total191100.00%2100.00%

static const struct rtc_class_ops em3027_rtc_ops = { .read_time = em3027_get_time, .set_time = em3027_set_time, };
static int em3027_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct rtc_device *rtc; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) return -ENODEV; rtc = devm_rtc_device_register(&client->dev, em3027_driver.driver.name, &em3027_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) return PTR_ERR(rtc); i2c_set_clientdata(client, rtc); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Rapoport7692.68%150.00%
Jingoo Han67.32%150.00%
Total82100.00%2100.00%

static const struct i2c_device_id em3027_id[] = { { "em3027", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, em3027_id); #ifdef CONFIG_OF static const struct of_device_id em3027_of_match[] = { { .compatible = "emmicro,em3027", }, {} }; MODULE_DEVICE_TABLE(of, em3027_of_match); #endif static struct i2c_driver em3027_driver = { .driver = { .name = "rtc-em3027", .of_match_table = of_match_ptr(em3027_of_match), }, .probe = &em3027_probe, .id_table = em3027_id, }; module_i2c_driver(em3027_driver); MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); MODULE_DESCRIPTION("EM Microelectronic EM3027 RTC driver"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Mike Rapoport62887.22%114.29%
Peter Robinson486.67%114.29%
Shubhrajyoti Datta334.58%114.29%
Jingoo Han60.83%114.29%
Paul Gortmaker30.42%114.29%
Axel Lin10.14%114.29%
Arvind Yadav10.14%114.29%
Total720100.00%7100.00%
Directory: drivers/rtc
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