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Date: Thu, 23 May 2013 14:07:49 +0200
From: Florian Lobmaier <Florian.Lobmaier@....com>
To: "sameo@...ux.intel.com" <sameo@...ux.intel.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 06/07] rtc patch of ams AS3722 PMIC against linux_3.8.8
From: Florian Lobmaier <florian.lobmaier@....com>
Added multi-function device driver support for ams AS3722 PMIC
Includes modules gpio, regulator, rtc, and watchdog
Signed-off-by: Florian Lobmaier <florian.lobmaier@....com>
---
diff -uprN -X Documentation/dontdiff ../kernel_3.8.8/linux-kernel/drivers/rtc/Kconfig ./drivers/rtc/Kconfig
--- ../kernel_3.8.8/linux-kernel/drivers/rtc/Kconfig 2013-05-15 14:55:55.000000000 +0200
+++ ./drivers/rtc/Kconfig 2013-05-23 13:12:37.000000000 +0200
@@ -125,6 +125,16 @@ comment "I2C RTC drivers"
if I2C
+config RTC_DRV_AS3722
+ tristate "ams AS3722"
+ depends on MFD_AS3722
+ help
+ If you say Y here you will get support for the RTC feature
+ of the ams AS3722 PMIC.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-as3722.
+
config RTC_DRV_88PM860X
tristate "Marvell 88PM860x"
depends on I2C && MFD_88PM860X
diff -uprN -X Documentation/dontdiff ../kernel_3.8.8/linux-kernel/drivers/rtc/Makefile ./drivers/rtc/Makefile
--- ../kernel_3.8.8/linux-kernel/drivers/rtc/Makefile 2013-05-15 14:55:55.000000000 +0200
+++ ./drivers/rtc/Makefile 2013-05-23 13:12:37.000000000 +0200
@@ -19,6 +19,7 @@ obj-$(CONFIG_RTC_DRV_88PM860X) += rtc-8
obj-$(CONFIG_RTC_DRV_88PM80X) += rtc-88pm80x.o
obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o
obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
+obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o
obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
obj-$(CONFIG_RTC_DRV_AT91SAM9) += rtc-at91sam9.o
diff -uprN -X Documentation/dontdiff ../kernel_3.8.8/linux-kernel/drivers/rtc/rtc-as3722.c ./drivers/rtc/rtc-as3722.c
--- ../kernel_3.8.8/linux-kernel/drivers/rtc/rtc-as3722.c 1970-01-01 01:00:00.000000000 +0100
+++ ./drivers/rtc/rtc-as3722.c 2013-05-23 13:12:37.000000000 +0200
@@ -0,0 +1,356 @@
+/*
+ * rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs
+ *
+ * Copyright (C) 2013 ams AG
+ *
+ * Author: Florian Lobmaier <florian.lobmaier@....com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/interrupt.h>
+#include <linux/ioctl.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/as3722-reg.h>
+#include <linux/mfd/as3722-plat.h>
+
+/* RTC defines:
+ * start year has to be a century that rtc works
+ * correctly with leap years, etc.
+ */
+#define AS3722_RTC_START_YEAR 2000
+#define AS3722_SET_ALM_RETRIES 5
+#define AS3722_SET_TIME_RETRIES 5
+#define AS3722_GET_TIME_RETRIES 5
+
+/*
+ * Read current time and date in RTC
+ */
+static int as3722_rtc_readtime(struct device *dev, struct rtc_time *tm)
+{
+ struct as3722 *as3722 = dev_get_drvdata(dev->parent);
+ u8 as_time_array[6];
+ int ret;
+
+ ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
+ 6, as_time_array);
+ if (ret < 0)
+ return ret;
+
+ tm->tm_sec = ((as_time_array[0] & 0xF0) >> 4) * 10
+ + (as_time_array[0] & 0x0F);
+ tm->tm_min = ((as_time_array[1] & 0xF0) >> 4) * 10
+ + (as_time_array[1] & 0x0F);
+ tm->tm_hour = ((as_time_array[2] & 0xF0) >> 4) * 10
+ + (as_time_array[2] & 0x0F);
+ tm->tm_mday = ((as_time_array[3] & 0xF0) >> 4) * 10
+ + (as_time_array[3] & 0x0F);
+ tm->tm_mon = ((as_time_array[4] & 0xF0) >> 4) * 10
+ + (as_time_array[4] & 0x0F);
+ tm->tm_year = (AS3722_RTC_START_YEAR - 1900)
+ + ((as_time_array[5] & 0xF0) >> 4) * 10
+ + (as_time_array[5] & 0x0F);
+
+ return 0;
+}
+
+/*
+ * Set current time and date in RTC
+ */
+static int as3722_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+ struct as3722 *as3722 = dev_get_drvdata(dev->parent);
+ u8 as_time_array[6];
+ int ret;
+
+ /* Write time to RTC */
+ as_time_array[0] = ((tm->tm_sec / 10) << 4)
+ + (tm->tm_sec % 10);
+ as_time_array[1] = ((tm->tm_min / 10) << 4)
+ + (tm->tm_min % 10);
+ as_time_array[2] = ((tm->tm_hour / 10) << 4)
+ + (tm->tm_hour % 10);
+ as_time_array[3] = ((tm->tm_mday / 10) << 4)
+ + (tm->tm_mday % 10);
+ as_time_array[4] = ((tm->tm_mon / 10) << 4)
+ + (tm->tm_mon % 10);
+ if (tm->tm_year > AS3722_RTC_START_YEAR)
+ as_time_array[5] = (((tm->tm_year - AS3722_RTC_START_YEAR)
+ / 10) << 4)
+ + ((tm->tm_year - AS3722_RTC_START_YEAR) % 10);
+ else
+ return -1;
+
+ ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
+ as_time_array);
+
+ return ret;
+}
+
+/*
+ * Read alarm time and date in RTC
+ */
+static int as3722_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct as3722 *as3722 = dev_get_drvdata(dev->parent);
+ u8 as_time_array[6];
+ int ret;
+
+ ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
+ 6, as_time_array);
+ if (ret < 0)
+ return ret;
+
+ alrm->time.tm_sec = ((as_time_array[0] & 0xF0) >> 4) * 10
+ + (as_time_array[0] & 0x0F);
+ alrm->time.tm_min = ((as_time_array[1] & 0xF0) >> 4) * 10
+ + (as_time_array[1] & 0x0F);
+ alrm->time.tm_hour = ((as_time_array[2] & 0xF0) >> 4) * 10
+ + (as_time_array[2] & 0x0F);
+ alrm->time.tm_mday = ((as_time_array[3] & 0xF0) >> 4) * 10
+ + (as_time_array[3] & 0x0F);
+ alrm->time.tm_mon = ((as_time_array[4] & 0xF0) >> 4) * 10
+ + (as_time_array[4] & 0x0F);
+ alrm->time.tm_year = (AS3722_RTC_START_YEAR - 1900)
+ + ((as_time_array[5] & 0xF0) >> 4) * 10
+ + (as_time_array[5] & 0x0F);
+
+ return 0;
+}
+
+static int as3722_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct as3722 *as3722 = dev_get_drvdata(dev->parent);
+ u8 as_time_array[6];
+ int ret;
+
+ /* Write time to RTC */
+ as_time_array[0] = ((alrm->time.tm_sec / 10) << 4)
+ + (alrm->time.tm_sec % 10);
+ as_time_array[1] = ((alrm->time.tm_min / 10) << 4)
+ + (alrm->time.tm_min % 10);
+ as_time_array[2] = ((alrm->time.tm_hour / 10) << 4)
+ + (alrm->time.tm_hour % 10);
+ as_time_array[3] = ((alrm->time.tm_mday / 10) << 4)
+ + (alrm->time.tm_mday % 10);
+ as_time_array[4] = ((alrm->time.tm_mon / 10) << 4)
+ + (alrm->time.tm_mon % 10);
+ if (alrm->time.tm_year > AS3722_RTC_START_YEAR)
+ as_time_array[5] =
+ (((alrm->time.tm_year - AS3722_RTC_START_YEAR)
+ / 10) << 4)
+ + ((alrm->time.tm_year - AS3722_RTC_START_YEAR) % 10);
+ else
+ return -1;
+
+ ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
+ as_time_array);
+
+ return ret;
+}
+
+static int as3722_rtc_stop_alarm(struct as3722 *as3722)
+{
+ /* disable rtc alarm interrupt */
+ return as3722_set_bits(as3722, AS3722_INTERRUPTMASK3_REG,
+ AS3722_IRQ_MASK_RTC_ALARM, AS3722_IRQ_BIT_RTC_ALARM);
+}
+
+static int as3722_rtc_start_alarm(struct as3722 *as3722)
+{
+ /* enable rtc alarm interrupt */
+ return as3722_set_bits(as3722, AS3722_INTERRUPTMASK3_REG,
+ AS3722_IRQ_MASK_RTC_ALARM, 0);
+}
+
+static int as3722_rtc_alarm_irq_enable(struct device *dev,
+ unsigned int enabled)
+{
+ struct as3722 *as3722 = dev_get_drvdata(dev->parent);
+
+ if (enabled)
+ return as3722_rtc_start_alarm(as3722);
+ else
+ return as3722_rtc_stop_alarm(as3722);
+}
+
+static irqreturn_t as3722_alarm_irq(int irq, void *data)
+{
+ struct as3722 *as3722 = data;
+ struct rtc_device *rtc = as3722->rtc.rtc;
+
+ rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+
+ return IRQ_HANDLED;
+}
+
+static const struct rtc_class_ops as3722_rtc_ops = {
+ .read_time = as3722_rtc_readtime,
+ .set_time = as3722_rtc_settime,
+ .read_alarm = as3722_rtc_readalarm,
+ .set_alarm = as3722_rtc_setalarm,
+ .alarm_irq_enable = as3722_rtc_alarm_irq_enable,
+};
+
+#ifdef CONFIG_PM
+static int as3722_rtc_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
+ int ret = 0;
+ u32 reg;
+
+ as3722_reg_read(as3722, AS3722_INTERRUPTMASK3_REG, ®);
+
+ if (device_may_wakeup(dev) &&
+ reg & AS3722_IRQ_MASK_RTC_ALARM) {
+ ret = as3722_rtc_stop_alarm(as3722);
+ if (ret != 0)
+ dev_err(dev, "Failed to stop RTC alarm: %d\n",
+ ret);
+ }
+
+ return ret;
+}
+
+static int as3722_rtc_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
+ int ret;
+
+ if (as3722->rtc.alarm_enabled) {
+ ret = as3722_rtc_start_alarm(as3722);
+ if (ret != 0)
+ dev_err(dev,
+ "Failed to restart RTC alarm: %d\n", ret);
+ }
+
+ return 0;
+}
+
+/* Unconditionally disable the alarm */
+static int as3722_rtc_freeze(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
+ int ret;
+
+ ret = as3722_set_bits(as3722, AS3722_RTC_CONTROL_REG,
+ AS3722_RTC_ALARM_WAKEUP_EN_MASK, 0);
+ if (ret != 0)
+ dev_err(&pdev->dev, "Failed to stop RTC alarm: %d\n", ret);
+
+ return 0;
+}
+
+#define DEV_PM_OPS (&as3722_rtc_pm_ops)
+#else
+#define DEV_PM_OPS NULL
+#endif
+
+static int as3722_rtc_probe(struct platform_device *pdev)
+{
+ struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
+ struct as3722_rtc *rtc = &as3722->rtc;
+ struct as3722_platform_data *pdata = as3722->dev->platform_data;
+ int alarm_irq = regmap_irq_get_virq(as3722->irq_data,
+ AS3722_IRQ_RTC_ALARM);
+ int ret = 0;
+ u32 ctrl;
+ /* enable the RTC if it's not already enabled */
+ as3722_reg_read(as3722, AS3722_RTC_CONTROL_REG, &ctrl);
+ if (!(ctrl & AS3722_RTC_ON_MASK)) {
+ dev_info(&pdev->dev, "Starting RTC\n");
+
+ ret = as3722_set_bits(as3722, AS3722_RTC_CONTROL_REG,
+ AS3722_RTC_ON_MASK, AS3722_RTC_ON_MASK);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "failed to enable RTC: %d\n", ret);
+ return ret;
+ }
+ }
+ /* enable alarm wakeup */
+ as3722_set_bits(as3722, AS3722_RTC_CONTROL_REG,
+ AS3722_RTC_ALARM_WAKEUP_EN_MASK,
+ AS3722_RTC_ALARM_WAKEUP_EN_MASK);
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ rtc->rtc = rtc_device_register("as3722", &pdev->dev,
+ &as3722_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc->rtc)) {
+ ret = PTR_ERR(rtc->rtc);
+ dev_err(&pdev->dev, "failed to register RTC: %d\n", ret);
+ return ret;
+ }
+
+ ret = request_threaded_irq(alarm_irq, NULL, as3722_alarm_irq,
+ pdata->irq_type, "RTC alarm",
+ rtc->rtc);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
+ alarm_irq, ret);
+ }
+
+ return 0;
+}
+
+static int as3722_rtc_remove(struct platform_device *pdev)
+{
+ struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
+ struct as3722_rtc *rtc = &as3722->rtc;
+ int alarm_irq = regmap_irq_get_virq(as3722->irq_data,
+ AS3722_IRQ_RTC_ALARM);
+
+ free_irq(alarm_irq, rtc->rtc);
+ rtc_device_unregister(rtc->rtc);
+
+ return 0;
+}
+
+static const struct dev_pm_ops as3722_rtc_pm_ops = {
+ .suspend = as3722_rtc_suspend,
+ .resume = as3722_rtc_resume,
+ .freeze = as3722_rtc_freeze,
+ .thaw = as3722_rtc_resume,
+ .restore = as3722_rtc_resume,
+ .poweroff = as3722_rtc_suspend,
+};
+
+static struct platform_driver as3722_rtc_driver = {
+ .probe = as3722_rtc_probe,
+ .remove = as3722_rtc_remove,
+ .driver = {
+ .name = "as3722-rtc",
+ .pm = DEV_PM_OPS,
+ },
+};
+
+module_platform_driver(as3722_rtc_driver);
+
+MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@....com>");
+MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:as3722-rtc");
--
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