From patchwork Tue Mar 17 14:09:36 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfgang Grandegger X-Patchwork-Id: 24560 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from mail-gx0-f181.google.com (mail-gx0-f181.google.com [209.85.217.181]) by ozlabs.org (Postfix) with ESMTP id F26DDDDED6 for ; Wed, 18 Mar 2009 01:09:48 +1100 (EST) Received: by gxk1 with SMTP id 1so949549gxk.17 for ; Tue, 17 Mar 2009 07:09:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlegroups.com; s=beta; h=domainkey-signature:received:received:x-sender:x-apparently-to :received:received:received-spf:authentication-results:received :x-auth-info:received:message-id:date:from:user-agent:mime-version :content-type:to:cc:subject:x-enigmail-version:reply-to:sender :precedence:x-google-loop:mailing-list:list-id:list-post:list-help :list-unsubscribe:x-beenthere-env:x-beenthere; bh=0SXFxG1+kQPZhnvQi1K/pS4/PrCgIRvK5XzIMpQCCrw=; b=0zqq1HQdnLG22YxQOzBp9Ie1EEMVDerfD5Ph6IAmxlUkUQIUt61O/UPvqxx7q39I5s mJCma0eFIbh2vIi17OqBeobWzCwmcTuYSDtKvJ+xdzbHceX9PTsAor17DYSDud3dWA1d lrAv60asvodrA/r3FUXu+AFMqonRO+RJXidcM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlegroups.com; s=beta; h=x-sender:x-apparently-to:received-spf:authentication-results :x-auth-info:message-id:date:from:user-agent:mime-version :content-type:to:cc:subject:x-enigmail-version:reply-to:sender :precedence:x-google-loop:mailing-list:list-id:list-post:list-help :list-unsubscribe:x-beenthere-env:x-beenthere; b=qGBE5mcdxyLadvZ2P7uYPK6kFVSzANixndDag+85jSPDWDFaacoK05e1mXaAWEP3aP DBU/WyXtZfnOruqQ6w97BCiKwnY6FhPbwVXI5b0h/st/+xkGmn2RMJcujTwp4FEJe+C4 5ngnueMteHWh1rgYZ6e1N7vq3azU16BEOURSs= Received: by 10.150.148.7 with SMTP id v7mr24384ybd.28.1237298982579; Tue, 17 Mar 2009 07:09:42 -0700 (PDT) Received: by 10.177.6.2 with SMTP id j2gr2020yqi.0; Tue, 17 Mar 2009 07:09:42 -0700 (PDT) X-Sender: wg@grandegger.com X-Apparently-To: rtc-linux@googlegroups.com Received: by 10.204.31.202 with SMTP id z10mr1050bkc.26.1237298981203; Tue, 17 Mar 2009 07:09:41 -0700 (PDT) Received: from mail-out.m-online.net (mail-out.m-online.net [212.18.0.9]) by gmr-mx.google.com with ESMTP id 14si65130fxm.7.2009.03.17.07.09.41; Tue, 17 Mar 2009 07:09:41 -0700 (PDT) Received-SPF: neutral (google.com: 212.18.0.9 is neither permitted nor denied by best guess record for domain of wg@grandegger.com) client-ip=212.18.0.9; Authentication-Results: gmr-mx.google.com; spf=neutral (google.com: 212.18.0.9 is neither permitted nor denied by best guess record for domain of wg@grandegger.com) smtp.mail=wg@grandegger.com Received: from mail01.m-online.net (mail.m-online.net [192.168.3.149]) by mail-out.m-online.net (Postfix) with ESMTP id 7EFE81C15299; Tue, 17 Mar 2009 15:11:33 +0100 (CET) X-Auth-Info: JrxdpRNSIhCXa+5nDMYFxdA+IlnqMBzUNBPeVHLEaCg= Received: from lancy.denx.de (host-82-135-33-74.customer.m-online.net [82.135.33.74]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp-auth.mnet-online.de (Postfix) with ESMTP id 27CC490018; Tue, 17 Mar 2009 15:09:39 +0100 (CET) Message-ID: <49BFAF20.2050009@grandegger.com> Date: Tue, 17 Mar 2009 15:09:36 +0100 From: Wolfgang Grandegger User-Agent: Thunderbird 2.0.0.19 (X11/20090105) Mime-Version: 1.0 To: rtc-linux@googlegroups.com CC: Matthias Fuchs , Yuri Tikhonov , Alessandro Zummo Subject: [rtc-linux] [PATCH] RTC: Add stand-alone driver for RX8025 chip X-Enigmail-Version: 0.95.7 Reply-To: rtc-linux@googlegroups.com Sender: rtc-linux@googlegroups.com Precedence: bulk X-Google-Loop: groups Mailing-List: list rtc-linux@googlegroups.com; contact rtc-linux+owner@googlegroups.com List-Id: List-Post: List-Help: List-Unsubscribe: , X-BeenThere-Env: rtc-linux@googlegroups.com X-BeenThere: rtc-linux@googlegroups.com This patch adds support for the Epson RX-8025SA/NB RTC chips. It includes support for alarms, periodic interrupts (1 Hz) and clock precision adjustment. For clock precision adjustment, the SYSFS file "clock_adjust_ppb" gets created in "/sys/class/rtc/rtcX/device". It permits to set and get the clock adjustment in ppb (parts per billion), e.g.: # echo -183000 > /sys/class/rtc/rtc0/device/clock_adjust_ppb # cat /sys/class/rtc/rtc0/device/clock_adjust_ppb -183000 This allows to compensate temperature dependent clock drifts. According to the RX8025 SA/NB application manual, the frequency and temperature characteristics can be approximated using the following equation: df = a * (ut - t)**2 df: Frequency deviation in any temperature a : Coefficient = (-35 +-5) * 10**-9 ut: Ultimate temperature in degree = +25 +-5 degree t : Any temperature in degree Signed-off-by: Wolfgang Grandegger Signed-off-by: Sergei Poselenov Signed-off-by: Yuri Tikhonov Signed-off-by: Dmitry Rakhchev --- drivers/rtc/Kconfig | 9 drivers/rtc/Makefile | 1 drivers/rtc/rtc-rx8025.c | 891 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 901 insertions(+) create mode 100644 drivers/rtc/rtc-rx8025.c --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. -~----------~----~----~----~------~----~------~--~--- Index: linux-2.6/drivers/rtc/Kconfig =================================================================== --- linux-2.6.orig/drivers/rtc/Kconfig +++ linux-2.6/drivers/rtc/Kconfig @@ -295,6 +295,15 @@ config RTC_DRV_RX8581 This driver can also be built as a module. If so the module will be called rtc-rx8581. +config RTC_DRV_RX8025 + tristate "Epson RX-8025SA/NB" + help + If you say yes here you get support for the Epson + RX-8025SA/NB RTC chips. + + This driver can also be built as a module. If so, the module + will be called rtc-rx8025. + endif # I2C comment "SPI RTC drivers" Index: linux-2.6/drivers/rtc/Makefile =================================================================== --- linux-2.6.orig/drivers/rtc/Makefile +++ linux-2.6/drivers/rtc/Makefile @@ -62,6 +62,7 @@ obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701 obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o +obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o obj-$(CONFIG_RTC_DRV_RX8581) += rtc-rx8581.o obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o Index: linux-2.6/drivers/rtc/rtc-rx8025.c =================================================================== --- /dev/null +++ linux-2.6/drivers/rtc/rtc-rx8025.c @@ -0,0 +1,891 @@ +/* + * Driver for Epson's RTC module RX-8025 SA/NB + * + * Copyright (C) 2005 by Digi International Inc. + * All rights reserved. + * + * Modify by fengjh at rising.com.cn + * + * 2006.11 + * + * Code cleanup by Sergei Poselenov, + * Converted to new style by Wolfgang Grandegger + * Alarm and periodic interrupt added by Dmitry Rakhchev + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* registers */ +#define RX8025_REG_SEC 0x00 +#define RX8025_REG_MIN 0x01 +#define RX8025_REG_HOUR 0x02 +#define RX8025_REG_WDAY 0x03 +#define RX8025_REG_MDAY 0x04 +#define RX8025_REG_MONTH 0x05 +#define RX8025_REG_YEAR 0x06 +#define RX8025_REG_DIGOFF 0x07 +#define RX8025_REG_ALWMIN 0x08 +#define RX8025_REG_ALWHOUR 0x09 +#define RX8025_REG_ALWWDAY 0x0a +#define RX8025_REG_ALDMIN 0x0b +#define RX8025_REG_ALDHOUR 0x0c +/* 0x0d is reserved */ +#define RX8025_REG_CTRL1 0x0e +#define RX8025_REG_CTRL2 0x0f + +#define RX8025_BIT_CTRL1_CT (7 << 0) +/* 1 Hz periodic level irq */ +#define RX8025_BIT_CTRL1_CT_1HZ 4 +#define RX8025_BIT_CTRL1_TEST (1 << 3) +#define RX8025_BIT_CTRL1_1224 (1 << 5) +#define RX8025_BIT_CTRL1_DALE (1 << 6) +#define RX8025_BIT_CTRL1_WALE (1 << 7) + +#define RX8025_BIT_CTRL2_DAFG (1 << 0) +#define RX8025_BIT_CTRL2_WAFG (1 << 1) +#define RX8025_BIT_CTRL2_CTFG (1 << 2) +#define RX8025_BIT_CTRL2_PON (1 << 4) +#define RX8025_BIT_CTRL2_XST (1 << 5) +#define RX8025_BIT_CTRL2_VDET (1 << 6) + +/* Clock precision adjustment */ +#define RX8025_ADJ_RESOLUTION 3050 /* in ppb */ +#define RX8025_ADJ_DATA_MAX 62 +#define RX8025_ADJ_DATA_MIN -62 + +static const struct i2c_device_id rx8025_id[] = { + { "rx8025", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, rx8025_id); + +struct rx8025_data { + struct i2c_client *client; + struct rtc_device *rtc; + struct work_struct work; + struct mutex mutex; + u8 ctrl1; + int exiting; +}; + +static irqreturn_t rx8025_irq(int irq, void *dev_id) +{ + struct i2c_client *client = dev_id; + struct rx8025_data *rx8025 = i2c_get_clientdata(client); + + disable_irq_nosync(irq); + schedule_work(&rx8025->work); + return IRQ_HANDLED; +} + +static void rx8025_work(struct work_struct *work) +{ + struct rx8025_data *rx8025 = container_of(work, + struct rx8025_data, work); + struct i2c_client *client = rx8025->client; + u8 command[2] = {RX8025_REG_CTRL2 << 4 | 0x08,}; + int ret; + struct i2c_msg msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = command, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = sizeof(command) - 1, + .buf = command + 1, + } + }; + u8 status; + + mutex_lock(&rx8025->mutex); + + ret = i2c_transfer(to_i2c_adapter(client->dev.parent), + msg, ARRAY_SIZE(msg)); + if (ret < ARRAY_SIZE(msg)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + status = command[1]; + if (!(status & RX8025_BIT_CTRL2_XST)) { + dev_warn(&client->dev, "Oscillation stop was detected," + "you may have to readjust the clock\n"); + } + + + if (status & RX8025_BIT_CTRL2_CTFG) { + /* periodic */ + status &= ~RX8025_BIT_CTRL2_CTFG; + local_irq_disable(); + rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); + local_irq_enable(); + } + + if (status & RX8025_BIT_CTRL2_DAFG) { + /* alarm */ + status &= RX8025_BIT_CTRL2_DAFG; + + command[0] = RX8025_REG_CTRL1 << 4; + command[1] = rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE; + + + ret = i2c_master_send(client, command, sizeof(command)); + if (ret < sizeof(command)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + local_irq_disable(); + rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); + local_irq_enable(); + } + /* acknowledge IRQ */ + command[0] = RX8025_REG_CTRL2 << 4; + command[1] = status | RX8025_BIT_CTRL2_XST; + + ret = i2c_master_send(client, command, sizeof(command)); + if (ret < sizeof(command)) + ret = ret >= 0 ? -EIO : ret; + else + ret = 0; + + +out: + if (!rx8025->exiting) + enable_irq(client->irq); + + mutex_unlock(&rx8025->mutex); +} + +static int rx8025_get_time(struct device *dev, struct rtc_time *dt) +{ + struct rx8025_data *rx8025 = dev_get_drvdata(dev); + u8 command = (RX8025_REG_SEC << 4) | 0x08; + u8 result[7]; + int ret; + struct i2c_msg msg[] = { + { + .addr = rx8025->client->addr, + .flags = 0, + .len = 1, + .buf = &command, + }, + { + .addr = rx8025->client->addr, + .flags = I2C_M_RD, + .len = sizeof(result), + .buf = result, + } + }; + + ret = i2c_transfer(to_i2c_adapter(rx8025->client->dev.parent), + msg, ARRAY_SIZE(msg)); + if (ret < ARRAY_SIZE(msg)) + return ret >= 0 ? -EIO : ret; + + dev_dbg(dev, "%s: read 0x%02x 0x%02x " + "0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__, + result[0], result[1], result[2], result[3], result[4], + result[5], result[6]); + + dt->tm_sec = bcd2bin(result[RX8025_REG_SEC] & 0x7f); + dt->tm_min = bcd2bin(result[RX8025_REG_MIN] & 0x7f); + if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) + dt->tm_hour = bcd2bin(result[RX8025_REG_HOUR] & 0x3f); + else + dt->tm_hour = bcd2bin(result[RX8025_REG_HOUR] & 0x1f) % 12 + + (result[RX8025_REG_HOUR] & 0x20 ? 12 : 0); + + dt->tm_mday = bcd2bin(result[RX8025_REG_MDAY] & 0x3f); + dt->tm_mon = bcd2bin(result[RX8025_REG_MONTH] & 0x1f) - 1; + dt->tm_year = bcd2bin(result[RX8025_REG_YEAR]); + + if (dt->tm_year < 70) + dt->tm_year += 100; + + dev_dbg(dev, "%s: result: %ds %dm %dh %dmd %dm %dy\n", + __func__, + dt->tm_sec, dt->tm_min, dt->tm_hour, + dt->tm_mday, dt->tm_mon, dt->tm_year); + + return rtc_valid_tm(dt); +} + +static int rx8025_set_time(struct device *dev, struct rtc_time *dt) +{ + struct rx8025_data *rx8025 = dev_get_drvdata(dev); + u8 command[8] = {RX8025_REG_SEC << 4,}; + int ret; + + /* + * BUG: The HW assumes every year that is a multiple of 4 to be a leap + * year. Next time this is wrong is 2100, which will not be a leap + * year. + */ + + + /* + * Here the read-only bits are written as "0". I'm not sure if that + * is sound. + */ + command[1 + RX8025_REG_SEC] = bin2bcd(dt->tm_sec); + command[1 + RX8025_REG_MIN] = bin2bcd(dt->tm_min); + if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) + command[1 + RX8025_REG_HOUR] = bin2bcd(dt->tm_hour); + else + command[1 + RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) | + bin2bcd((dt->tm_hour + 11) % 12 + 1); + + command[1 + RX8025_REG_WDAY] = bin2bcd(dt->tm_wday); + command[1 + RX8025_REG_MDAY] = bin2bcd(dt->tm_mday); + command[1 + RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1); + command[1 + RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100); + + dev_dbg(dev, "%s: send 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x " + "0x%02x 0x%02x\n", __func__, + command[0], command[1], command[2], command[3], + command[4], command[5], command[6], command[7]); + + ret = i2c_master_send(rx8025->client, command, sizeof(command)); + if (ret < sizeof(command)) + return ret >= 0 ? -EIO : ret; + + return 0; + +} + +static int rx8025_init_client(struct i2c_client *client, int *need_reset) +{ + u8 command[3] = {RX8025_REG_CTRL1 << 4 | 0x08,}; + int ret; + struct i2c_msg msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = command, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = sizeof(command) - 1, + .buf = command + 1, + } + }; + struct rx8025_data *rx8025 = i2c_get_clientdata(client); + int need_clear = 0; + + ret = i2c_transfer(to_i2c_adapter(client->dev.parent), + msg, ARRAY_SIZE(msg)); + if (ret < ARRAY_SIZE(msg)) + return ret >= 0 ? -EIO : ret; + + /* Keep TEST bit zero ! */ + rx8025->ctrl1 = command[1] & ~RX8025_BIT_CTRL1_TEST; + + if (command[2] & RX8025_BIT_CTRL2_PON) { + dev_warn(&client->dev, "power-on reset was detected, " + "you may have to readjust the clock\n"); + *need_reset = 1; + } + + if (command[2] & RX8025_BIT_CTRL2_VDET) { + dev_warn(&client->dev, "a power voltage drop was detected, " + "you may have to readjust the clock\n"); + *need_reset = 1; + } + + if (!(command[2] & RX8025_BIT_CTRL2_XST)) { + dev_warn(&client->dev, "Oscillation stop was detected," + "you may have to readjust the clock\n"); + *need_reset = 1; + } + + if (command[2] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) { + dev_warn(&client->dev, "Alarm was detected\n"); + need_clear = 1; + } + + if (!(command[2] & RX8025_BIT_CTRL2_CTFG)) + need_clear = 1; + + if (*need_reset || need_clear) { + command[1] &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET + | RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG + | RX8025_BIT_CTRL2_DAFG); + command[1] |= RX8025_BIT_CTRL2_XST; + + command[0] = RX8025_REG_CTRL2 << 4; + + ret = i2c_master_send(client, command, 2); + if (ret < 2) + return ret >= 0 ? -EIO : ret; + } + + return 0; +} + +/* Alarm support */ +static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t) +{ + + struct rx8025_data *rx8025 = dev_get_drvdata(dev); + struct i2c_client *client = rx8025->client; + u8 command = (RX8025_REG_ALDMIN << 4) | 0x08; + u8 result[2]; + int ret; + u8 ctrl2; + u8 ctrl2_cmd = (RX8025_REG_CTRL2 << 4) | 0x08; + struct i2c_msg ctrl2_msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = &ctrl2_cmd, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = sizeof(result), + .buf = &ctrl2, + } + }; + struct i2c_msg msg[] = { + { + .addr = rx8025->client->addr, + .flags = 0, + .len = 1, + .buf = &command, + }, + { + .addr = rx8025->client->addr, + .flags = I2C_M_RD, + .len = sizeof(result), + .buf = result, + } + }; + + if (client->irq < 0) + return -EINVAL; + + mutex_lock(&rx8025->mutex); + + ret = i2c_transfer(to_i2c_adapter(rx8025->client->dev.parent), + msg, ARRAY_SIZE(msg)); + if (ret < ARRAY_SIZE(msg)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + + ret = i2c_transfer(to_i2c_adapter(rx8025->client->dev.parent), + ctrl2_msg, ARRAY_SIZE(ctrl2_msg)); + if (ret < ARRAY_SIZE(ctrl2_msg)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + + dev_dbg(dev, "%s: read 0x%02x 0x%02x ctrl2: %02x\n", __func__, + result[0], result[1], ctrl2); + + /* Hardware alarms precision is 1 minute! */ + t->time.tm_sec = 0; + t->time.tm_min = bcd2bin(result[0] & 0x7f); + if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) + t->time.tm_hour = bcd2bin(result[1] & 0x3f); + else + t->time.tm_hour = bcd2bin(result[1] & 0x1f) % 12 + + (result[1] & 0x20 ? 12 : 0); + + if (t->time.tm_min >= 60) + t->time.tm_min = -1; + + if (t->time.tm_hour >= 24) + t->time.tm_hour = -1; + + t->time.tm_wday = -1; + t->time.tm_mday = -1; + t->time.tm_mon = -1; + t->time.tm_year = -1; + + dev_dbg(dev, "%s: result: %ds %dm %dh %dmd %dm %dy\n", + __func__, + t->time.tm_sec, t->time.tm_min, t->time.tm_hour, + t->time.tm_mday, t->time.tm_mon, t->time.tm_year); + t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE); + t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled; + ret = 0; +out: + mutex_unlock(&rx8025->mutex); + + return ret; +} + +static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t) +{ + struct i2c_client *client = to_i2c_client(dev); + struct rx8025_data *rx8025 = dev_get_drvdata(dev); + u8 command[3] = {RX8025_REG_ALDMIN << 4,}; + int ret; + + if (client->irq < 0) + return -EINVAL; + + if ((t->time.tm_min < 0) || (t->time.tm_min >= 60)) + return -EINVAL; + + if ((t->time.tm_hour < 0) || (t->time.tm_hour >= 24)) + return -EINVAL; + + /* Hardware alarms precision is 1 minute! */ + command[1] = bin2bcd(t->time.tm_min); + if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) + command[2] = bin2bcd(t->time.tm_hour); + else + command[2] = (t->time.tm_hour >= 12 ? 0x20 : 0) | + bin2bcd((t->time.tm_hour + 11) % 12 + 1); + + dev_dbg(dev, "%s: send 0x%02x 0x%02x 0x%02x\n", __func__, + command[0], command[1], command[2]); + + mutex_lock(&rx8025->mutex); + + if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) { + u8 command[2] = {RX8025_REG_CTRL1 << 4, }; + rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE; + command[1] = rx8025->ctrl1; + ret = i2c_master_send(rx8025->client, command, sizeof(command)); + if (ret < sizeof(command)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + } + ret = i2c_master_send(rx8025->client, command, sizeof(command)); + if (ret < sizeof(command)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + + if (t->enabled) { + u8 command[2] = {RX8025_REG_CTRL1 << 4, }; + rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE; + command[1] = rx8025->ctrl1; + ret = i2c_master_send(rx8025->client, command, sizeof(command)); + if (ret < sizeof(command)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + } + ret = 0; +out: + mutex_unlock(&rx8025->mutex); + return ret; +} + +static int +rx8025_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + struct rx8025_data *rx8025 = dev_get_drvdata(dev); + u8 command[2] = {RX8025_REG_CTRL1 << 4,}; + u8 reg; + int ret = 0; + + mutex_lock(&rx8025->mutex); + + reg = rx8025->ctrl1; + switch (cmd) { + /* AIE = Alarm Interrupt Enable */ + case RTC_AIE_OFF: + reg &= ~RX8025_BIT_CTRL1_DALE; + break; + case RTC_AIE_ON: + reg |= RX8025_BIT_CTRL1_DALE; + break; + default: + ret = -ENOIOCTLCMD; + } + if (ret == 0 && reg != rx8025->ctrl1) { + rx8025->ctrl1 = reg; + command[1] = rx8025->ctrl1; + ret = i2c_master_send(rx8025->client, command, sizeof(command)); + if (ret < sizeof(command)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + } +out: + mutex_unlock(&rx8025->mutex); + + return ret; +} + +static int rx8025_irq_set_freq(struct device *dev, int freq) +{ + struct i2c_client *client = to_i2c_client(dev); + + if (client->irq < 0) + return -ENXIO; + + /* Hardware support 1Hz, 1/60Hz, 1/3600Hz and monthly + * interrupts, but only 1Hz fits on 2^N requirement. + * + * There's also 2Hz 50% duty pulse mode, but it is difficult + * to support as IRQ. + */ + /* Mark, that frequency can't be changed */ + return -ENOTTY; +} + +static int rx8025_irq_set_state(struct device *dev, int enabled) +{ + struct i2c_client *client = to_i2c_client(dev); + struct rx8025_data *rx8025 = i2c_get_clientdata(client); + int ret; + u8 reg; + + if (client->irq < 0) + return -ENXIO; + + mutex_lock(&rx8025->mutex); + + reg = rx8025->ctrl1; + reg &= ~RX8025_BIT_CTRL1_CT; + if (enabled) + reg |= RX8025_BIT_CTRL1_CT_1HZ; + if (reg != rx8025->ctrl1) { + u8 command[2]; + + rx8025->ctrl1 = reg; + command[0] = RX8025_REG_CTRL1 << 4; + command[1] = rx8025->ctrl1; + ret = i2c_master_send(rx8025->client, command, sizeof(command)); + if (ret < sizeof(command)) { + ret = ret >= 0 ? -EIO : ret; + goto out; + } + } + ret = 0; +out: + mutex_unlock(&rx8025->mutex); + + return ret; +} + +static struct rtc_class_ops rx8025_rtc_ops = { + .ioctl = rx8025_ioctl, + .read_time = rx8025_get_time, + .set_time = rx8025_set_time, + .read_alarm = rx8025_read_alarm, + .set_alarm = rx8025_set_alarm, + .irq_set_freq = rx8025_irq_set_freq, + .irq_set_state = rx8025_irq_set_state, + +}; + +/* + * Clock precision adjustment support + * + * According to the RX8025 SA/NB application manual the frequency and + * temperature charateristics can be approximated using the following + * equation: + * + * df = a * (ut - t)**2 + * + * df: Frequency deviation in any temperature + * a : Coefficient = (-35 +-5) * 10**-9 + * ut: Ultimate temperature in degree = +25 +-5 degree + * t : Any temperature in degree + * + * Note that the clock adjustment in ppb must be entered (which is + * the negative value of the deviation). + */ +static int rx8025_get_clock_adjust(struct device *dev, int *adj) +{ + struct i2c_client *client = to_i2c_client(dev); + u8 command = RX8025_REG_DIGOFF << 4 | 0x08; + u8 result; + int ret; + struct i2c_msg msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = &command, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = sizeof(result), + .buf = &result, + } + }; + + ret = i2c_transfer(to_i2c_adapter(client->dev.parent), + msg, ARRAY_SIZE(msg)); + if (ret < ARRAY_SIZE(msg)) { + ret = ret >= 0 ? -EIO : ret; + return ret; + } + + *adj = result >= 64 ? result - 128 : result; + if (*adj > 0) + (*adj)--; + *adj *= -RX8025_ADJ_RESOLUTION; + + return 0; +} + +static int rx8025_set_clock_adjust(struct device *dev, int adj) +{ + struct i2c_client *client = to_i2c_client(dev); + u8 command[2]; + int ret; + + adj /= -RX8025_ADJ_RESOLUTION; + if (adj > RX8025_ADJ_DATA_MAX) + adj = RX8025_ADJ_DATA_MAX; + else if (adj < RX8025_ADJ_DATA_MIN) + adj = RX8025_ADJ_DATA_MIN; + else if (adj > 0) + adj++; + else if (adj < 0) + adj += 128; + + command[0] = RX8025_REG_DIGOFF << 4; + command[1] = adj; + + dev_dbg(dev, "%s: send 0x%02x 0x%02x\n", + __func__, command[0], command[1]); + + ret = i2c_master_send(client, command, sizeof(command)); + if (ret < sizeof(command)) + return ret >= 0 ? -EIO : ret; + + return 0; +} + +static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int err, adj = 0; + + err = rx8025_get_clock_adjust(dev, &adj); + if (err) + return err; + + return sprintf(buf, "%d\n", adj); +} + +static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int adj, err; + + if (sscanf(buf, "%i", &adj) != 1) + return -EINVAL; + + err = rx8025_set_clock_adjust(dev, adj); + + return err ? err : count; +} + +static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR, + rx8025_sysfs_show_clock_adjust, + rx8025_sysfs_store_clock_adjust); + +static int rx8025_sysfs_register(struct device *dev) +{ + return device_create_file(dev, &dev_attr_clock_adjust_ppb); +} + +static void rx8025_sysfs_unregister(struct device *dev) +{ + device_remove_file(dev, &dev_attr_clock_adjust_ppb); +} + +static int __devinit rx8025_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct rx8025_data *rx8025; + int i, err, need_reset = 0; + u8 command = 0x08; + u8 result[RX8025_REG_YEAR + 1]; + struct i2c_msg msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = &command, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = sizeof(result), + .buf = result, + } + }; + u8 zero_mask[] = { + 0x80, /* seconds */ + 0x80, /* minutes */ + 0xC0, /* hours */ + 0xF8, /* days */ + 0xC0, /* days */ + 0x60, /* months */ + 0x00, /* years */ + }; + + if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) { + dev_err(&adapter->dev, "doesn't support full I2C\n"); + err = -EIO; + goto errout; + } + + rx8025 = kzalloc(sizeof(*rx8025), GFP_KERNEL); + if (!rx8025) { + dev_err(&adapter->dev, "failed to alloc memory\n"); + err = -ENOMEM; + goto errout; + } + + rx8025->client = client; + i2c_set_clientdata(client, rx8025); + INIT_WORK(&rx8025->work, rx8025_work); + mutex_init(&rx8025->mutex); + + err = i2c_transfer(adapter, msg, ARRAY_SIZE(msg)); + if (err < ARRAY_SIZE(msg)) { + err = err >= 0 ? 0 : err; + goto errout_free; + } + + for (i = 0; i < ARRAY_SIZE(zero_mask); ++i) { + if (result[i] & zero_mask[i]) { + dev_dbg(&adapter->dev, "%s: register=0x%02x, " + "value=0x%02x\n", __func__, + i, result[i]); + err = -ENODEV; + goto errout_free; + } + } + + err = rx8025_init_client(client, &need_reset); + if (err) + goto errout_free; + + rx8025->rtc = rtc_device_register(client->name, &client->dev, + &rx8025_rtc_ops, THIS_MODULE); + if (IS_ERR(rx8025->rtc)) { + err = PTR_ERR(rx8025->rtc); + dev_err(&client->dev, + "unable to register the class device\n"); + goto errout_free; + } + + dev_info(&client->dev, "IRQ %d supplied\n", client->irq); + if (client->irq >= 0) { + err = request_irq(client->irq, rx8025_irq, 0, + "rx8025", client); + if (err) { + dev_err(&client->dev, "unable to request IRQ\n"); + goto errout_reg; + } + } + + + rx8025->rtc->irq_freq = 1; + rx8025->rtc->max_user_freq = 1; + + err = rx8025_sysfs_register(&client->dev); + if (err) + goto errout_irq; + + dev_info(&client->dev, "chip found\n"); + + if (need_reset) { + struct rtc_time tm; + dev_info(&client->dev, + "Bad conditions detected, resetting date\n"); + rtc_time_to_tm(0, &tm); /* 1970/1/1 */ + rx8025_set_time(&client->dev, &tm); + } + return 0; + + errout_reg: + rtc_device_unregister(rx8025->rtc); + + errout_irq: + if (client->irq >= 0) + free_irq(client->irq, client); + + errout_free: + kfree(rx8025); + + errout: + dev_err(&adapter->dev, "Probing for rx8025 failed\n"); + return err; +} + +static int __devexit rx8025_remove(struct i2c_client *client) +{ + struct rx8025_data *rx8025 = i2c_get_clientdata(client); + + if (client->irq >= 0) { + mutex_lock(&rx8025->mutex); + rx8025->exiting = 1; + mutex_unlock(&rx8025->mutex); + + free_irq(client->irq, client); + flush_scheduled_work(); + } + + rx8025_sysfs_unregister(&client->dev); + rtc_device_unregister(rx8025->rtc); + i2c_set_clientdata(client, NULL); + kfree(rx8025); + return 0; +} + +static struct i2c_driver rx8025_driver = { + .driver = { + .name = "rtc-rx8025", + .owner = THIS_MODULE, + }, + .probe = rx8025_probe, + .remove = __devexit_p(rx8025_remove), + .id_table = rx8025_id, +}; + +static int __init rx8025_init(void) +{ + return i2c_add_driver(&rx8025_driver); +} + +static void __exit rx8025_exit(void) +{ + i2c_del_driver(&rx8025_driver); +} + +MODULE_AUTHOR("Uwe Zeisberger digi.com>" + " and modified by fengjh rising.com.cn"); +MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver"); +MODULE_LICENSE("GPL"); + +module_init(rx8025_init); +module_exit(rx8025_exit);