97958cafc8
respectivly. This will allow one to have a kernel with both devices present and use it for multiple boards with different types of RTC sitting on a bus. Discussed with: imp
364 lines
8.5 KiB
C
364 lines
8.5 KiB
C
/*-
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* Copyright (c) 2008 Stanislav Sedov <stas@FreeBSD.org>,
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* Rafal Jaworowski <raj@FreeBSD.org>,
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* Piotr Ziecik <kosmo@semihalf.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Dallas Semiconductor DS133X RTC sitting on the I2C bus.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/clock.h>
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#include <sys/time.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include "iicbus_if.h"
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#include "clock_if.h"
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#define DS133X_DEVNAME "ds133x_rtc"
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#define DS133X_ADDR 0xd0 /* slave address */
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#define DS133X_DATE_REG 0x0
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#define DS133X_CTRL_REG 0x0e
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#define DS133X_OSCD_FLAG 0x80
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#define DS133X_OSF_FLAG 0x80
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#define DS133X_24H_FLAG 0x40 /* 24 hours mode. */
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#define DS133X_PM_FLAG 0x20 /* AM/PM bit. */
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#define DS133X_CENT_FLAG 0x80 /* Century selector. */
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#define DS133X_CENT_SHIFT 7
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#define DS1338_REG_CLOCK_HALT 0x00
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#define DS1338_REG_CONTROL 0x07
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#define DS1338_CLOCK_HALT (1 << 7)
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#define DS1338_OSC_STOP (1 << 5)
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#define DS1339_REG_CONTROL 0x0E
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#define DS1339_REG_STATUS 0x0F
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#define DS1339_OSC_STOP (1 << 7)
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#define DS1339_ENABLE_OSC (1 << 7)
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#define DS1339_BBSQI (1 << 5)
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#define HALFSEC 500000000 /* 1/2 of second. */
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#define MAX_IIC_DATA_SIZE 7
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enum {
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DS1337,
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DS1338,
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DS1339,
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};
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struct ds133x_softc {
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int sc_type;
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device_t sc_dev;
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};
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static int
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ds133x_read(device_t dev, uint8_t address, uint8_t *data, uint8_t size)
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{
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struct iic_msg msg[] = {
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{ DS133X_ADDR, IIC_M_WR, 1, &address },
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{ DS133X_ADDR, IIC_M_RD, size, data },
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};
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return (iicbus_transfer(dev, msg, 2));
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}
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static int
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ds133x_write(device_t dev, uint8_t address, uint8_t *data, uint8_t size)
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{
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uint8_t buffer[MAX_IIC_DATA_SIZE + 1];
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struct iic_msg msg[] = {
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{ DS133X_ADDR, IIC_M_WR, size + 1, buffer },
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};
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if (size > MAX_IIC_DATA_SIZE)
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return (ENOMEM);
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buffer[0] = address;
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memcpy(buffer + 1, data, size);
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return (iicbus_transfer(dev, msg, 1));
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}
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static int
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ds133x_detect(device_t dev, int *sc_type)
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{
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int error;
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uint8_t reg, orig;
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/*
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* Check for DS1338. At address 0x0F this chip has RAM, however
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* DS1337 and DS1339 have status register. Bits 6-2 in status
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* register will be always read as 0.
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*/
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if ((error = ds133x_read(dev, DS1339_REG_STATUS, ®, 1)))
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return (error);
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orig = reg;
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reg |= 0x7C;
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if ((error = ds133x_write(dev, DS1339_REG_STATUS, ®, 1)))
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return (error);
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if ((error = ds133x_read(dev, DS1339_REG_STATUS, ®, 1)))
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return (error);
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if ((reg & 0x7C) != 0) {
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/* This is DS1338 */
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if ((error = ds133x_write(dev, DS1339_REG_STATUS, &orig, 1)))
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return (error);
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*sc_type = DS1338;
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return (0);
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}
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/*
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* Now Check for DS1337. Bit 5 in control register of this chip will be
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* allways read as 0. In DS1339 changing of this bit is safe until
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* chip is powered up.
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*/
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if ((error = ds133x_read(dev, DS1339_REG_CONTROL, ®, 1)))
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return (error);
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orig = reg;
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reg |= DS1339_BBSQI;
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if ((error = ds133x_write(dev, DS1339_REG_CONTROL, ®, 1)))
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return (error);
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if ((error = ds133x_read(dev, DS1339_REG_CONTROL, ®, 1)))
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return (error);
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if ((reg & DS1339_BBSQI) != 0) {
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/* This is DS1339 */
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if ((error = ds133x_write(dev, DS1339_REG_CONTROL, &orig, 1)))
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return (error);
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*sc_type = DS1339;
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return (0);
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}
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/* This is DS1337 */
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*sc_type = DS1337;
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return (0);
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}
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static int
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ds133x_init(device_t dev, uint8_t cs_reg, uint8_t cs_bit, uint8_t osf_reg,
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uint8_t osf_bit)
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{
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int error;
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uint8_t reg;
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if ((error = ds133x_read(dev, cs_reg, ®, 1)))
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return (error);
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if (reg & cs_bit) { /* If clock is stopped - start it */
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reg &= ~cs_bit;
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if ((error = ds133x_write(dev, cs_reg, ®, 1)))
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return (error);
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}
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if ((error = ds133x_read(dev, osf_reg, ®, 1)))
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return (error);
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if (reg & osf_bit) { /* Clear oscillator stop flag */
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device_printf(dev, "RTC oscillator was stopped. Check system"
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" time and RTC battery.\n");
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reg &= ~osf_bit;
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if ((error = ds133x_write(dev, osf_reg, ®, 1)))
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return (error);
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}
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return (0);
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}
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static void
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ds133x_identify(driver_t *driver, device_t parent)
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{
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if (device_find_child(parent, DS133X_DEVNAME, -1) == NULL)
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BUS_ADD_CHILD(parent, 0, DS133X_DEVNAME, -1);
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}
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static int
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ds133x_probe(device_t dev)
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{
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struct ds133x_softc *sc;
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int error;
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sc = device_get_softc(dev);
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if ((error = ds133x_detect(dev, &sc->sc_type)))
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return (error);
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switch (sc->sc_type) {
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case DS1337:
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device_set_desc(dev, "Dallas Semiconductor DS1337 RTC");
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break;
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case DS1338:
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device_set_desc(dev, "Dallas Semiconductor DS1338 RTC");
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break;
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case DS1339:
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device_set_desc(dev, "Dallas Semiconductor DS1339 RTC");
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break;
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default:
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break;
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}
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return (0);
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}
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static int
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ds133x_attach(device_t dev)
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{
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struct ds133x_softc *sc = device_get_softc(dev);
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sc->sc_dev = dev;
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if (sc->sc_type == DS1338)
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ds133x_init(dev, DS1338_REG_CLOCK_HALT, DS1338_CLOCK_HALT,
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DS1338_REG_CONTROL, DS1338_OSC_STOP);
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else
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ds133x_init(dev, DS1339_REG_CONTROL, DS1339_ENABLE_OSC,
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DS1339_REG_STATUS, DS1339_OSC_STOP);
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clock_register(dev, 1000000);
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return (0);
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}
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static uint8_t
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ds133x_get_hours(uint8_t val)
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{
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uint8_t ret;
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if (!(val & DS133X_24H_FLAG))
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ret = FROMBCD(val & 0x3f);
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else if (!(val & DS133X_PM_FLAG))
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ret = FROMBCD(val & 0x1f);
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else
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ret = FROMBCD(val & 0x1f) + 12;
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return (ret);
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}
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static int
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ds133x_gettime(device_t dev, struct timespec *ts)
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{
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struct ds133x_softc *sc = device_get_softc(dev);
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struct clocktime ct;
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uint8_t date[7];
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int error;
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error = ds133x_read(dev, DS133X_DATE_REG, date, 7);
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if (error == 0) {
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ct.nsec = 0;
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ct.sec = FROMBCD(date[0] & 0x7f);
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ct.min = FROMBCD(date[1] & 0x7f);
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ct.hour = ds133x_get_hours(date[2]);
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ct.dow = FROMBCD(date[3] & 0x07) - 1;
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ct.day = FROMBCD(date[4] & 0x3f);
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ct.mon = FROMBCD(date[5] & 0x1f);
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if (sc->sc_type == DS1338)
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ct.year = 2000 + FROMBCD(date[6]);
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else
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ct.year = 1900 + FROMBCD(date[6]) +
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((date[5] & DS133X_CENT_FLAG) >> DS133X_CENT_SHIFT) * 100;
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error = clock_ct_to_ts(&ct, ts);
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}
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return (error);
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}
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static int
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ds133x_settime(device_t dev, struct timespec *ts)
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{
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struct ds133x_softc *sc = device_get_softc(dev);
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struct clocktime ct;
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uint8_t date[7];
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clock_ts_to_ct(ts, &ct);
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date[0] = TOBCD(ct.nsec >= HALFSEC ? ct.sec + 1 : ct.sec) & 0x7f;
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date[1] = TOBCD(ct.min) & 0x7f;
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date[2] = TOBCD(ct.hour) & 0x3f; /* We use 24-hours mode. */
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date[3] = TOBCD(ct.dow + 1) & 0x07;
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date[4] = TOBCD(ct.day) & 0x3f;
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date[5] = TOBCD(ct.mon) & 0x1f;
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if (sc->sc_type == DS1338)
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date[6] = TOBCD(ct.year - 2000);
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else if (ct.year >= 2000) {
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date[5] |= DS133X_CENT_FLAG;
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date[6] = TOBCD(ct.year - 2000);
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} else
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date[6] = TOBCD(ct.year - 1900);
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return (ds133x_write(dev, DS133X_DATE_REG, date, 7));
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}
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static device_method_t ds133x_methods[] = {
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DEVMETHOD(device_identify, ds133x_identify),
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DEVMETHOD(device_probe, ds133x_probe),
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DEVMETHOD(device_attach, ds133x_attach),
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DEVMETHOD(clock_gettime, ds133x_gettime),
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DEVMETHOD(clock_settime, ds133x_settime),
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{0, 0},
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};
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static driver_t ds133x_driver = {
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DS133X_DEVNAME,
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ds133x_methods,
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sizeof(struct ds133x_softc),
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};
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static devclass_t ds133x_devclass;
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DRIVER_MODULE(ds133x, iicbus, ds133x_driver, ds133x_devclass, 0, 0);
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MODULE_VERSION(ds133x, 1);
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MODULE_DEPEND(ds133x, iicbus, 1, 1, 1);
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