rtc: Add MAX8998 rtc driver
This adds support for the RTC provided by the Maxim 8998 chip. This driver was tested on a GONI board by using the rtc-test application from the Documentation/rtc.txt. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>hifive-unleashed-5.1
Joonyoung Shim
Samuel Ortiz
parent
2c7e6f5797
commit
9b16c0a43b
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@ -30,10 +30,14 @@
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#include <linux/mfd/max8998.h>
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#include <linux/mfd/max8998-private.h>
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#define RTC_I2C_ADDR (0x0c >> 1)
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static struct mfd_cell max8998_devs[] = {
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{
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.name = "max8998-pmic",
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}
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}, {
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.name = "max8998-rtc",
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},
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};
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int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
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@ -80,6 +84,21 @@ int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
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}
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EXPORT_SYMBOL(max8998_write_reg);
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int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
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mutex_unlock(&max8998->iolock);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL(max8998_bulk_write);
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int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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@ -120,6 +139,9 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
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}
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mutex_init(&max8998->iolock);
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max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
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i2c_set_clientdata(max8998->rtc, max8998);
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max8998_irq_init(max8998);
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ret = mfd_add_devices(max8998->dev, -1,
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@ -196,6 +196,16 @@ config RTC_DRV_MAX8925
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This driver can also be built as a module. If so, the module
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will be called rtc-max8925.
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config RTC_DRV_MAX8998
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tristate "Maxim MAX8998"
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depends on MFD_MAX8998
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help
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If you say yes here you will get support for the
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RTC of Maxim MAX8998 PMIC.
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This driver can also be built as a module. If so, the module
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will be called rtc-max8998.
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config RTC_DRV_RS5C372
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tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
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help
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@ -60,6 +60,7 @@ obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
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obj-$(CONFIG_RTC_MXC) += rtc-mxc.o
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obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
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obj-$(CONFIG_RTC_DRV_MAX8925) += rtc-max8925.o
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obj-$(CONFIG_RTC_DRV_MAX8998) += rtc-max8998.o
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obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
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obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o
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obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.o
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@ -0,0 +1,300 @@
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/*
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* RTC driver for Maxim MAX8998
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*
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* Copyright (C) 2010 Samsung Electronics Co.Ltd
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* Author: Minkyu Kang <mk7.kang@samsung.com>
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* Author: Joonyoung Shim <jy0922.shim@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/max8998.h>
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#include <linux/mfd/max8998-private.h>
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#define MAX8998_RTC_SEC 0x00
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#define MAX8998_RTC_MIN 0x01
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#define MAX8998_RTC_HOUR 0x02
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#define MAX8998_RTC_WEEKDAY 0x03
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#define MAX8998_RTC_DATE 0x04
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#define MAX8998_RTC_MONTH 0x05
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#define MAX8998_RTC_YEAR1 0x06
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#define MAX8998_RTC_YEAR2 0x07
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#define MAX8998_ALARM0_SEC 0x08
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#define MAX8998_ALARM0_MIN 0x09
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#define MAX8998_ALARM0_HOUR 0x0a
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#define MAX8998_ALARM0_WEEKDAY 0x0b
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#define MAX8998_ALARM0_DATE 0x0c
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#define MAX8998_ALARM0_MONTH 0x0d
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#define MAX8998_ALARM0_YEAR1 0x0e
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#define MAX8998_ALARM0_YEAR2 0x0f
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#define MAX8998_ALARM1_SEC 0x10
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#define MAX8998_ALARM1_MIN 0x11
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#define MAX8998_ALARM1_HOUR 0x12
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#define MAX8998_ALARM1_WEEKDAY 0x13
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#define MAX8998_ALARM1_DATE 0x14
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#define MAX8998_ALARM1_MONTH 0x15
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#define MAX8998_ALARM1_YEAR1 0x16
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#define MAX8998_ALARM1_YEAR2 0x17
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#define MAX8998_ALARM0_CONF 0x18
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#define MAX8998_ALARM1_CONF 0x19
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#define MAX8998_RTC_STATUS 0x1a
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#define MAX8998_WTSR_SMPL_CNTL 0x1b
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#define MAX8998_TEST 0x1f
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#define HOUR_12 (1 << 7)
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#define HOUR_PM (1 << 5)
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#define ALARM0_STATUS (1 << 1)
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#define ALARM1_STATUS (1 << 2)
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enum {
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RTC_SEC = 0,
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RTC_MIN,
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RTC_HOUR,
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RTC_WEEKDAY,
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RTC_DATE,
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RTC_MONTH,
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RTC_YEAR1,
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RTC_YEAR2,
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};
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struct max8998_rtc_info {
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struct device *dev;
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struct max8998_dev *max8998;
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struct i2c_client *rtc;
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struct rtc_device *rtc_dev;
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int irq;
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};
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static void max8998_data_to_tm(u8 *data, struct rtc_time *tm)
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{
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tm->tm_sec = bcd2bin(data[RTC_SEC]);
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tm->tm_min = bcd2bin(data[RTC_MIN]);
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if (data[RTC_HOUR] & HOUR_12) {
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tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
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if (data[RTC_HOUR] & HOUR_PM)
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tm->tm_hour += 12;
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} else
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tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
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tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
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tm->tm_mday = bcd2bin(data[RTC_DATE]);
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tm->tm_mon = bcd2bin(data[RTC_MONTH]);
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tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
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tm->tm_year -= 1900;
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}
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static void max8998_tm_to_data(struct rtc_time *tm, u8 *data)
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{
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data[RTC_SEC] = bin2bcd(tm->tm_sec);
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data[RTC_MIN] = bin2bcd(tm->tm_min);
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data[RTC_HOUR] = bin2bcd(tm->tm_hour);
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data[RTC_WEEKDAY] = tm->tm_wday;
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data[RTC_DATE] = bin2bcd(tm->tm_mday);
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data[RTC_MONTH] = bin2bcd(tm->tm_mon);
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data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
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data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
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}
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static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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int ret;
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ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data);
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if (ret < 0)
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return ret;
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max8998_data_to_tm(data, tm);
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return rtc_valid_tm(tm);
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}
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static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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max8998_tm_to_data(tm, data);
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return max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data);
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}
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static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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u8 val;
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int ret;
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ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data);
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if (ret < 0)
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return ret;
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max8998_data_to_tm(data, &alrm->time);
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ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val);
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if (ret < 0)
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return ret;
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alrm->enabled = !!val;
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ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val);
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if (ret < 0)
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return ret;
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if (val & ALARM0_STATUS)
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alrm->pending = 1;
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else
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alrm->pending = 0;
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return 0;
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}
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static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info)
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{
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return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0);
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}
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static int max8998_rtc_start_alarm(struct max8998_rtc_info *info)
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{
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return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0x77);
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}
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static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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int ret;
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max8998_tm_to_data(&alrm->time, data);
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ret = max8998_rtc_stop_alarm(info);
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if (ret < 0)
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return ret;
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ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data);
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if (ret < 0)
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return ret;
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if (alrm->enabled)
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return max8998_rtc_start_alarm(info);
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return 0;
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}
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static int max8998_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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if (enabled)
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return max8998_rtc_start_alarm(info);
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else
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return max8998_rtc_stop_alarm(info);
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}
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static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data)
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{
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struct max8998_rtc_info *info = data;
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rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops max8998_rtc_ops = {
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.read_time = max8998_rtc_read_time,
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.set_time = max8998_rtc_set_time,
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.read_alarm = max8998_rtc_read_alarm,
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.set_alarm = max8998_rtc_set_alarm,
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.alarm_irq_enable = max8998_rtc_alarm_irq_enable,
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};
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static int __devinit max8998_rtc_probe(struct platform_device *pdev)
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{
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struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent);
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struct max8998_rtc_info *info;
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int ret;
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info = kzalloc(sizeof(struct max8998_rtc_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &pdev->dev;
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info->max8998 = max8998;
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info->rtc = max8998->rtc;
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info->irq = max8998->irq_base + MAX8998_IRQ_ALARM0;
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info->rtc_dev = rtc_device_register("max8998-rtc", &pdev->dev,
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&max8998_rtc_ops, THIS_MODULE);
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if (IS_ERR(info->rtc_dev)) {
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ret = PTR_ERR(info->rtc_dev);
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dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
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goto out_rtc;
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}
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platform_set_drvdata(pdev, info);
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ret = request_threaded_irq(info->irq, NULL, max8998_rtc_alarm_irq, 0,
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"rtc-alarm0", info);
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if (ret < 0)
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dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
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info->irq, ret);
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return 0;
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out_rtc:
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kfree(info);
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return ret;
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}
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static int __devexit max8998_rtc_remove(struct platform_device *pdev)
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{
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struct max8998_rtc_info *info = platform_get_drvdata(pdev);
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if (info) {
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free_irq(info->irq, info);
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rtc_device_unregister(info->rtc_dev);
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kfree(info);
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}
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return 0;
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}
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static struct platform_driver max8998_rtc_driver = {
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.driver = {
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.name = "max8998-rtc",
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.owner = THIS_MODULE,
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},
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.probe = max8998_rtc_probe,
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.remove = __devexit_p(max8998_rtc_remove),
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};
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static int __init max8998_rtc_init(void)
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{
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return platform_driver_register(&max8998_rtc_driver);
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}
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module_init(max8998_rtc_init);
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static void __exit max8998_rtc_exit(void)
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{
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platform_driver_unregister(&max8998_rtc_driver);
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}
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module_exit(max8998_rtc_exit);
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MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
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MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
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MODULE_DESCRIPTION("Maxim MAX8998 RTC driver");
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MODULE_LICENSE("GPL");
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@ -126,7 +126,8 @@ enum {
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/**
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* struct max8998_dev - max8998 master device for sub-drivers
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* @dev: master device of the chip (can be used to access platform data)
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* @i2c: i2c client private data
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* @i2c: i2c client private data for regulator
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* @rtc: i2c client private data for rtc
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* @iolock: mutex for serializing io access
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* @irqlock: mutex for buslock
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* @irq_base: base IRQ number for max8998, required for IRQs
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@ -138,6 +139,7 @@ enum {
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struct max8998_dev {
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struct device *dev;
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struct i2c_client *i2c;
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struct i2c_client *rtc;
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struct mutex iolock;
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struct mutex irqlock;
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@ -155,6 +157,8 @@ extern int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest);
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extern int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count,
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u8 *buf);
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extern int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value);
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extern int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count,
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u8 *buf);
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extern int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask);
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#endif /* __LINUX_MFD_MAX8998_PRIV_H */
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