From patchwork Fri Sep 19 10:26:17 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javier Martinez Canillas X-Patchwork-Id: 4937041 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C4D929F32F for ; Fri, 19 Sep 2014 10:30:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CDDB6201ED for ; Fri, 19 Sep 2014 10:30:41 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A05B3201D3 for ; Fri, 19 Sep 2014 10:30:36 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XUvQQ-0007ve-Ho; Fri, 19 Sep 2014 10:28:26 +0000 Received: from bhuna.collabora.co.uk ([93.93.135.160]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XUvPL-0006W8-A0 for linux-arm-kernel@lists.infradead.org; Fri, 19 Sep 2014 10:27:21 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: javier) with ESMTPSA id C099A609FB4 From: Javier Martinez Canillas To: Andrew Morton Subject: [PATCH v10 6/6] rtc: Add driver for Maxim 77802 PMIC Real-Time-Clock Date: Fri, 19 Sep 2014 12:26:17 +0200 Message-Id: <1411122377-10426-7-git-send-email-javier.martinez@collabora.co.uk> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1411122377-10426-1-git-send-email-javier.martinez@collabora.co.uk> References: <1411122377-10426-1-git-send-email-javier.martinez@collabora.co.uk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140919_032719_854114_084D92A1 X-CRM114-Status: GOOD ( 23.08 ) X-Spam-Score: -0.7 (/) Cc: Alessandro Zummo , Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org, rtc-linux@googlegroups.com, Doug Anderson , linux-kernel@vger.kernel.org, Javier Martinez Canillas , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The MAX7802 PMIC has a Real-Time-Clock (RTC) with two alarms. This patch adds support for the RTC and is based on a driver added by Simon Glass to the Chrome OS kernel 3.8 tree. Signed-off-by: Javier Martinez Canillas Reviewed-by: Krzysztof Kozlowski --- Changes since v9: - Use ffs() to calculate tm_wday instead of a custom function. Suggested by Andrew Morton. Changes since v8: None Changes since v7: None Changes since v6: - Remove unused code for SMPL and WTSR. Suggested by Krzysztof Kozlowski. - Don't spam the kernel log with unnecessarily info and just print for debug. Suggested by Krzysztof Kozlowski. - Use ARRAY_SIZE() instead of constant value. Suggested by Krzysztof Kozlowski. - Remove duplicated register setup. Suggested by Krzysztof Kozlowski. - Don't free/unregister managed allocated resources. Suggested by Krzysztof Kozlowski. drivers/rtc/Kconfig | 10 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-max77802.c | 501 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 512 insertions(+) create mode 100644 drivers/rtc/rtc-max77802.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index fae9464..241b8be 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -288,6 +288,16 @@ config RTC_DRV_MAX77686 This driver can also be built as a module. If so, the module will be called rtc-max77686. +config RTC_DRV_MAX77802 + tristate "Maxim 77802 RTC" + depends on MFD_MAX77686 + help + If you say yes here you will get support for the + RTC of Maxim MAX77802 PMIC. + + This driver can also be built as a module. If so, the module + will be called rtc-max77802. + config RTC_DRV_RS5C372 tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A" help diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 56f061c..d55ebe2 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -85,6 +85,7 @@ obj-$(CONFIG_RTC_DRV_MAX8998) += rtc-max8998.o obj-$(CONFIG_RTC_DRV_MAX8997) += rtc-max8997.o obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o obj-$(CONFIG_RTC_DRV_MAX77686) += rtc-max77686.o +obj-$(CONFIG_RTC_DRV_MAX77802) += rtc-max77802.o obj-$(CONFIG_RTC_DRV_MC13XXX) += rtc-mc13xxx.o obj-$(CONFIG_RTC_DRV_MCP795) += rtc-mcp795.o obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.o diff --git a/drivers/rtc/rtc-max77802.c b/drivers/rtc/rtc-max77802.c new file mode 100644 index 0000000..3a00ec2 --- /dev/null +++ b/drivers/rtc/rtc-max77802.c @@ -0,0 +1,501 @@ +/* + * RTC driver for Maxim MAX77802 + * + * Copyright (C) 2013 Google, Inc + * + * Copyright (C) 2012 Samsung Electronics Co.Ltd + * + * based on rtc-max8997.c + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* RTC Control Register */ +#define BCD_EN_SHIFT 0 +#define BCD_EN_MASK (1 << BCD_EN_SHIFT) +#define MODEL24_SHIFT 1 +#define MODEL24_MASK (1 << MODEL24_SHIFT) +/* RTC Update Register1 */ +#define RTC_UDR_SHIFT 0 +#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT) +#define RTC_RBUDR_SHIFT 4 +#define RTC_RBUDR_MASK (1 << RTC_RBUDR_SHIFT) +/* RTC Hour register */ +#define HOUR_PM_SHIFT 6 +#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT) +/* RTC Alarm Enable */ +#define ALARM_ENABLE_SHIFT 7 +#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT) + +/* For the RTCAE1 register, we write this value to enable the alarm */ +#define ALARM_ENABLE_VALUE 0x77 + +#define MAX77802_RTC_UPDATE_DELAY_US 200 + +enum { + RTC_SEC = 0, + RTC_MIN, + RTC_HOUR, + RTC_WEEKDAY, + RTC_MONTH, + RTC_YEAR, + RTC_DATE, + RTC_NR_TIME +}; + +struct max77802_rtc_info { + struct device *dev; + struct max77686_dev *max77802; + struct i2c_client *rtc; + struct rtc_device *rtc_dev; + struct mutex lock; + + struct regmap *regmap; + + int virq; + int rtc_24hr_mode; +}; + +enum MAX77802_RTC_OP { + MAX77802_RTC_WRITE, + MAX77802_RTC_READ, +}; + +static void max77802_rtc_data_to_tm(u8 *data, struct rtc_time *tm, + int rtc_24hr_mode) +{ + tm->tm_sec = data[RTC_SEC] & 0xff; + tm->tm_min = data[RTC_MIN] & 0xff; + if (rtc_24hr_mode) + tm->tm_hour = data[RTC_HOUR] & 0x1f; + else { + tm->tm_hour = data[RTC_HOUR] & 0x0f; + if (data[RTC_HOUR] & HOUR_PM_MASK) + tm->tm_hour += 12; + } + + tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0xff) - 1; + tm->tm_mday = data[RTC_DATE] & 0x1f; + tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1; + + tm->tm_year = data[RTC_YEAR] & 0xff; + tm->tm_yday = 0; + tm->tm_isdst = 0; +} + +static int max77802_rtc_tm_to_data(struct rtc_time *tm, u8 *data) +{ + data[RTC_SEC] = tm->tm_sec; + data[RTC_MIN] = tm->tm_min; + data[RTC_HOUR] = tm->tm_hour; + data[RTC_WEEKDAY] = 1 << tm->tm_wday; + data[RTC_DATE] = tm->tm_mday; + data[RTC_MONTH] = tm->tm_mon + 1; + data[RTC_YEAR] = tm->tm_year; + + return 0; +} + +static int max77802_rtc_update(struct max77802_rtc_info *info, + enum MAX77802_RTC_OP op) +{ + int ret; + unsigned int data; + + if (op == MAX77802_RTC_WRITE) + data = 1 << RTC_UDR_SHIFT; + else + data = 1 << RTC_RBUDR_SHIFT; + + ret = regmap_update_bits(info->max77802->regmap, + MAX77802_RTC_UPDATE0, data, data); + if (ret < 0) + dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n", + __func__, ret, data); + else { + /* Minimum delay required before RTC update. */ + usleep_range(MAX77802_RTC_UPDATE_DELAY_US, + MAX77802_RTC_UPDATE_DELAY_US * 2); + } + + return ret; +} + +static int max77802_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct max77802_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + int ret; + + mutex_lock(&info->lock); + + ret = max77802_rtc_update(info, MAX77802_RTC_READ); + if (ret < 0) + goto out; + + ret = regmap_bulk_read(info->max77802->regmap, + MAX77802_RTC_SEC, data, RTC_NR_TIME); + if (ret < 0) { + dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__, + ret); + goto out; + } + + max77802_rtc_data_to_tm(data, tm, info->rtc_24hr_mode); + + ret = rtc_valid_tm(tm); + +out: + mutex_unlock(&info->lock); + return ret; +} + +static int max77802_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct max77802_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + int ret; + + ret = max77802_rtc_tm_to_data(tm, data); + if (ret < 0) + return ret; + + mutex_lock(&info->lock); + + ret = regmap_bulk_write(info->max77802->regmap, + MAX77802_RTC_SEC, data, RTC_NR_TIME); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__, + ret); + goto out; + } + + ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); + +out: + mutex_unlock(&info->lock); + return ret; +} + +static int max77802_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct max77802_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + unsigned int val; + int ret; + + mutex_lock(&info->lock); + + ret = max77802_rtc_update(info, MAX77802_RTC_READ); + if (ret < 0) + goto out; + + ret = regmap_bulk_read(info->max77802->regmap, + MAX77802_ALARM1_SEC, data, RTC_NR_TIME); + if (ret < 0) { + dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n", + __func__, __LINE__, ret); + goto out; + } + + max77802_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode); + + alrm->enabled = 0; + ret = regmap_read(info->max77802->regmap, + MAX77802_RTC_AE1, &val); + if (ret < 0) { + dev_err(info->dev, "%s:%d fail to read alarm enable(%d)\n", + __func__, __LINE__, ret); + goto out; + } + if (val) + alrm->enabled = 1; + + alrm->pending = 0; + ret = regmap_read(info->max77802->regmap, MAX77802_REG_STATUS2, &val); + if (ret < 0) { + dev_err(info->dev, "%s:%d fail to read status2 reg(%d)\n", + __func__, __LINE__, ret); + goto out; + } + + if (val & (1 << 2)) /* RTCA1 */ + alrm->pending = 1; + +out: + mutex_unlock(&info->lock); + return 0; +} + +static int max77802_rtc_stop_alarm(struct max77802_rtc_info *info) +{ + int ret; + + if (!mutex_is_locked(&info->lock)) + dev_warn(info->dev, "%s: should have mutex locked\n", __func__); + + ret = max77802_rtc_update(info, MAX77802_RTC_READ); + if (ret < 0) + goto out; + + ret = regmap_write(info->max77802->regmap, + MAX77802_RTC_AE1, 0); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", + __func__, ret); + goto out; + } + + ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); +out: + return ret; +} + +static int max77802_rtc_start_alarm(struct max77802_rtc_info *info) +{ + int ret; + + if (!mutex_is_locked(&info->lock)) + dev_warn(info->dev, "%s: should have mutex locked\n", + __func__); + + ret = max77802_rtc_update(info, MAX77802_RTC_READ); + if (ret < 0) + goto out; + + ret = regmap_write(info->max77802->regmap, + MAX77802_RTC_AE1, + ALARM_ENABLE_VALUE); + + if (ret < 0) { + dev_err(info->dev, "%s: fail to read alarm reg(%d)\n", + __func__, ret); + goto out; + } + + ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); +out: + return ret; +} + +static int max77802_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct max77802_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + int ret; + + ret = max77802_rtc_tm_to_data(&alrm->time, data); + if (ret < 0) + return ret; + + mutex_lock(&info->lock); + + ret = max77802_rtc_stop_alarm(info); + if (ret < 0) + goto out; + + ret = regmap_bulk_write(info->max77802->regmap, + MAX77802_ALARM1_SEC, data, RTC_NR_TIME); + + if (ret < 0) { + dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", + __func__, ret); + goto out; + } + + ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); + if (ret < 0) + goto out; + + if (alrm->enabled) + ret = max77802_rtc_start_alarm(info); +out: + mutex_unlock(&info->lock); + return ret; +} + +static int max77802_rtc_alarm_irq_enable(struct device *dev, + unsigned int enabled) +{ + struct max77802_rtc_info *info = dev_get_drvdata(dev); + int ret; + + mutex_lock(&info->lock); + if (enabled) + ret = max77802_rtc_start_alarm(info); + else + ret = max77802_rtc_stop_alarm(info); + mutex_unlock(&info->lock); + + return ret; +} + +static irqreturn_t max77802_rtc_alarm_irq(int irq, void *data) +{ + struct max77802_rtc_info *info = data; + + dev_dbg(info->dev, "%s:irq(%d)\n", __func__, irq); + + rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF); + + return IRQ_HANDLED; +} + +static const struct rtc_class_ops max77802_rtc_ops = { + .read_time = max77802_rtc_read_time, + .set_time = max77802_rtc_set_time, + .read_alarm = max77802_rtc_read_alarm, + .set_alarm = max77802_rtc_set_alarm, + .alarm_irq_enable = max77802_rtc_alarm_irq_enable, +}; + +static int max77802_rtc_init_reg(struct max77802_rtc_info *info) +{ + u8 data[2]; + int ret; + + max77802_rtc_update(info, MAX77802_RTC_READ); + + /* Set RTC control register : Binary mode, 24hour mdoe */ + data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); + data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); + + info->rtc_24hr_mode = 1; + + ret = regmap_bulk_write(info->max77802->regmap, + MAX77802_RTC_CONTROLM, data, ARRAY_SIZE(data)); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write controlm reg(%d)\n", + __func__, ret); + return ret; + } + + ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); + return ret; +} + +static int max77802_rtc_probe(struct platform_device *pdev) +{ + struct max77686_dev *max77802 = dev_get_drvdata(pdev->dev.parent); + struct max77802_rtc_info *info; + int ret; + + dev_dbg(&pdev->dev, "%s\n", __func__); + + info = devm_kzalloc(&pdev->dev, sizeof(struct max77802_rtc_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + mutex_init(&info->lock); + info->dev = &pdev->dev; + info->max77802 = max77802; + info->rtc = max77802->i2c; + + platform_set_drvdata(pdev, info); + + ret = max77802_rtc_init_reg(info); + + if (ret < 0) { + dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret); + return ret; + } + + device_init_wakeup(&pdev->dev, 1); + + info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77802-rtc", + &max77802_rtc_ops, THIS_MODULE); + + if (IS_ERR(info->rtc_dev)) { + ret = PTR_ERR(info->rtc_dev); + dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); + if (ret == 0) + ret = -EINVAL; + return ret; + } + + if (!max77802->rtc_irq_data) { + dev_err(&pdev->dev, "No RTC regmap IRQ chip\n"); + return -EINVAL; + } + + info->virq = regmap_irq_get_virq(max77802->rtc_irq_data, + MAX77686_RTCIRQ_RTCA1); + + if (info->virq <= 0) { + dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n", + MAX77686_RTCIRQ_RTCA1); + return -EINVAL; + } + + ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL, + max77802_rtc_alarm_irq, 0, "rtc-alarm1", + info); + if (ret < 0) + dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", + info->virq, ret); + + return ret; +} + +#ifdef CONFIG_PM_SLEEP +static int max77802_rtc_suspend(struct device *dev) +{ + if (device_may_wakeup(dev)) { + struct max77802_rtc_info *info = dev_get_drvdata(dev); + + return enable_irq_wake(info->virq); + } + + return 0; +} + +static int max77802_rtc_resume(struct device *dev) +{ + if (device_may_wakeup(dev)) { + struct max77802_rtc_info *info = dev_get_drvdata(dev); + + return disable_irq_wake(info->virq); + } + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(max77802_rtc_pm_ops, + max77802_rtc_suspend, max77802_rtc_resume); + +static const struct platform_device_id rtc_id[] = { + { "max77802-rtc", 0 }, + {}, +}; + +static struct platform_driver max77802_rtc_driver = { + .driver = { + .name = "max77802-rtc", + .owner = THIS_MODULE, + .pm = &max77802_rtc_pm_ops, + }, + .probe = max77802_rtc_probe, + .id_table = rtc_id, +}; + +module_platform_driver(max77802_rtc_driver); + +MODULE_DESCRIPTION("Maxim MAX77802 RTC driver"); +MODULE_AUTHOR("Simon Glass "); +MODULE_LICENSE("GPL");