--- /dev/null
+/*
+ * rtc-tps65910.c -- TPS65910 Real Time Clock interface
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ * Author: Venu Byravarasu <vbyravarasu@nvidia.com>
+ *
+ * Based on original TI driver rtc-twl.c
+ * Copyright (C) 2007 MontaVista Software, Inc
+ * Author: Alexandre Rusev <source@mvista.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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/tps65910.h>
+
+struct tps65910_rtc {
+ struct rtc_device *rtc;
+ /* To store the list of enabled interrupts */
+ u32 irqstat;
+};
+
+/* Total number of RTC registers needed to set time*/
+#define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1)
+
+static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
+{
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+ u8 val = 0;
+
+ if (enabled)
+ val = TPS65910_RTC_INTERRUPTS_IT_ALARM;
+
+ return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
+}
+
+/*
+ * Gets current tps65910 RTC time and date parameters.
+ *
+ * The RTC's time/alarm representation is not what gmtime(3) requires
+ * Linux to use:
+ *
+ * - Months are 1..12 vs Linux 0-11
+ * - Years are 0..99 vs Linux 1900..N (we assume 21st century)
+ */
+static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ unsigned char rtc_data[NUM_TIME_REGS];
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+ int ret;
+
+ /* Copy RTC counting registers to static registers or latches */
+ ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
+ TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
+ if (ret < 0) {
+ dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
+ return ret;
+ }
+
+ ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
+ NUM_TIME_REGS);
+ if (ret < 0) {
+ dev_err(dev, "reading from RTC failed with err:%d\n", ret);
+ return ret;
+ }
+
+ tm->tm_sec = bcd2bin(rtc_data[0]);
+ tm->tm_min = bcd2bin(rtc_data[1]);
+ tm->tm_hour = bcd2bin(rtc_data[2]);
+ tm->tm_mday = bcd2bin(rtc_data[3]);
+ tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
+ tm->tm_year = bcd2bin(rtc_data[5]) + 100;
+
+ return ret;
+}
+
+static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ unsigned char rtc_data[NUM_TIME_REGS];
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+ int ret;
+
+ rtc_data[0] = bin2bcd(tm->tm_sec);
+ rtc_data[1] = bin2bcd(tm->tm_min);
+ rtc_data[2] = bin2bcd(tm->tm_hour);
+ rtc_data[3] = bin2bcd(tm->tm_mday);
+ rtc_data[4] = bin2bcd(tm->tm_mon + 1);
+ rtc_data[5] = bin2bcd(tm->tm_year - 100);
+
+ /* Stop RTC while updating the RTC time registers */
+ ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
+ TPS65910_RTC_CTRL_STOP_RTC, 0);
+ if (ret < 0) {
+ dev_err(dev, "RTC stop failed with err:%d\n", ret);
+ return ret;
+ }
+
+ /* update all the time registers in one shot */
+ ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
+ NUM_TIME_REGS);
+ if (ret < 0) {
+ dev_err(dev, "rtc_set_time error %d\n", ret);
+ return ret;
+ }
+
+ /* Start back RTC */
+ ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
+ TPS65910_RTC_CTRL_STOP_RTC, 1);
+ if (ret < 0)
+ dev_err(dev, "RTC start failed with err:%d\n", ret);
+
+ return ret;
+}
+
+/*
+ * Gets current tps65910 RTC alarm time.
+ */
+static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ unsigned char alarm_data[NUM_TIME_REGS];
+ u32 int_val;
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+ int ret;
+
+ ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data,
+ NUM_TIME_REGS);
+ if (ret < 0) {
+ dev_err(dev, "rtc_read_alarm error %d\n", ret);
+ return ret;
+ }
+
+ alm->time.tm_sec = bcd2bin(alarm_data[0]);
+ alm->time.tm_min = bcd2bin(alarm_data[1]);
+ alm->time.tm_hour = bcd2bin(alarm_data[2]);
+ alm->time.tm_mday = bcd2bin(alarm_data[3]);
+ alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
+ alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;
+
+ ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
+ if (ret < 0)
+ return ret;
+
+ if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
+ alm->enabled = 1;
+
+ return ret;
+}
+
+static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ unsigned char alarm_data[NUM_TIME_REGS];
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+ int ret;
+
+ ret = tps65910_rtc_alarm_irq_enable(dev, 0);
+ if (ret)
+ return ret;
+
+ alarm_data[0] = bin2bcd(alm->time.tm_sec);
+ alarm_data[1] = bin2bcd(alm->time.tm_min);
+ alarm_data[2] = bin2bcd(alm->time.tm_hour);
+ alarm_data[3] = bin2bcd(alm->time.tm_mday);
+ alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
+ alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
+
+ /* update all the alarm registers in one shot */
+ ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
+ alarm_data, NUM_TIME_REGS);
+ if (ret) {
+ dev_err(dev, "rtc_set_alarm error %d\n", ret);
+ return ret;
+ }
+
+ if (alm->enabled)
+ ret = tps65910_rtc_alarm_irq_enable(dev, 1);
+
+ return ret;
+}
+
+static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
+{
+ struct device *dev = rtc;
+ unsigned long events = 0;
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+ struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
+ int ret;
+ u32 rtc_reg;
+
+ ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
+ if (ret)
+ return IRQ_NONE;
+
+ if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
+ events = RTC_IRQF | RTC_AF;
+
+ ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
+ if (ret)
+ return IRQ_NONE;
+
+ /* Notify RTC core on event */
+ rtc_update_irq(tps_rtc->rtc, 1, events);
+
+ return IRQ_HANDLED;
+}
+
+static const struct rtc_class_ops tps65910_rtc_ops = {
+ .read_time = tps65910_rtc_read_time,
+ .set_time = tps65910_rtc_set_time,
+ .read_alarm = tps65910_rtc_read_alarm,
+ .set_alarm = tps65910_rtc_set_alarm,
+ .alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
+};
+
+static int __devinit tps65910_rtc_probe(struct platform_device *pdev)
+{
+ struct tps65910 *tps65910 = NULL;
+ struct tps65910_rtc *tps_rtc = NULL;
+ struct tps65910_board *pmic_plat_data;
+ int ret;
+ int irq;
+ u32 rtc_reg;
+
+ tps65910 = dev_get_drvdata(pdev->dev.parent);
+
+ tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
+ GFP_KERNEL);
+ if (!tps_rtc)
+ return -ENOMEM;
+
+ /* Clear pending interrupts */
+ ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
+ rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
+ ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
+ if (ret < 0)
+ return ret;
+
+ pmic_plat_data = dev_get_platdata(tps65910->dev);
+ irq = pmic_plat_data->irq_base;
+ if (irq <= 0) {
+ dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
+ irq);
+ return ret;
+ }
+
+ irq += TPS65910_IRQ_RTC_ALARM;
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,
+ "rtc-tps65910", &pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "IRQ is not free.\n");
+ return ret;
+ }
+ device_init_wakeup(&pdev->dev, 1);
+
+ tps_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
+ &tps65910_rtc_ops, THIS_MODULE);
+ if (IS_ERR(tps_rtc->rtc)) {
+ ret = PTR_ERR(tps_rtc->rtc);
+ dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, tps_rtc);
+
+ return 0;
+}
+
+/*
+ * Disable tps65910 RTC interrupts.
+ * Sets status flag to free.
+ */
+static int __devexit tps65910_rtc_remove(struct platform_device *pdev)
+{
+ /* leave rtc running, but disable irqs */
+ struct rtc_device *rtc = platform_get_drvdata(pdev);
+
+ tps65910_rtc_alarm_irq_enable(&rtc->dev, 0);
+
+ rtc_device_unregister(rtc);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+static int tps65910_rtc_suspend(struct device *dev)
+{
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+ u8 alarm = TPS65910_RTC_INTERRUPTS_IT_ALARM;
+ int ret;
+
+ /* Store current list of enabled interrupts*/
+ ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS,
+ &tps->rtc->irqstat);
+ if (ret < 0)
+ return ret;
+
+ /* Enable RTC ALARM interrupt only */
+ return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, alarm);
+}
+
+static int tps65910_rtc_resume(struct device *dev)
+{
+ struct tps65910 *tps = dev_get_drvdata(dev->parent);
+
+ /* Restore list of enabled interrupts before suspend */
+ return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS,
+ tps->rtc->irqstat);
+}
+
+static const struct dev_pm_ops tps65910_rtc_pm_ops = {
+ .suspend = tps65910_rtc_suspend,
+ .resume = tps65910_rtc_resume,
+};
+
+#define DEV_PM_OPS (&tps65910_rtc_pm_ops)
+#else
+#define DEV_PM_OPS NULL
+#endif
+
+static struct platform_driver tps65910_rtc_driver = {
+ .probe = tps65910_rtc_probe,
+ .remove = __devexit_p(tps65910_rtc_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "rtc-tps65910",
+ .pm = DEV_PM_OPS,
+ },
+};
+
+module_platform_driver(tps65910_rtc_driver);
+MODULE_ALIAS("platform:rtc-tps65910");
+MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
+MODULE_LICENSE("GPL");
projects / karo-tx-linux.git / commitdiff