--- /dev/null
+/*
+ * Real time clock driver for DA9052
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Dajun Chen <dajun.chen@diasemi.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/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+#define rtc_err(da9052, fmt, ...) \
+ dev_err(da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
+
+struct da9052_rtc {
+ struct rtc_device *rtc;
+ struct da9052 *da9052;
+ int irq;
+};
+
+static int da9052_rtc_enable_alarm(struct da9052 *da9052, bool enable)
+{
+ int ret;
+ if (enable) {
+ ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
+ DA9052_ALARM_Y_ALARM_ON,
+ DA9052_ALARM_Y_ALARM_ON);
+ if (ret != 0)
+ rtc_err(da9052, "Failed to enable ALM: %d\n", ret);
+ } else {
+ ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
+ DA9052_ALARM_Y_ALARM_ON, 0);
+ if (ret != 0)
+ rtc_err(da9052, "Write error: %d\n", ret);
+ }
+ return ret;
+}
+
+static irqreturn_t da9052_rtc_irq(int irq, void *data)
+{
+ struct da9052_rtc *rtc = data;
+ int ret;
+
+ ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_MI_REG);
+ if (ret < 0) {
+ rtc_err(rtc->da9052, "Read error: %d\n", ret);
+ return IRQ_NONE;
+ }
+
+ if (ret & DA9052_ALARMMI_ALARMTYPE) {
+ da9052_rtc_enable_alarm(rtc->da9052, 0);
+ rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
+ } else
+ rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_PF);
+
+ return IRQ_HANDLED;
+}
+
+static int da9052_read_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)
+{
+ int ret;
+ uint8_t v[5];
+
+ ret = da9052_group_read(da9052, DA9052_ALARM_MI_REG, 5, v);
+ if (ret != 0) {
+ rtc_err(da9052, "Failed to group read ALM: %d\n", ret);
+ return ret;
+ }
+
+ rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100;
+ rtc_tm->tm_mon = (v[3] & DA9052_RTC_MONTH) - 1;
+ rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY;
+ rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR;
+ rtc_tm->tm_min = v[0] & DA9052_RTC_MIN;
+
+ ret = rtc_valid_tm(rtc_tm);
+ if (ret != 0)
+ return ret;
+ return ret;
+}
+
+static int da9052_set_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)
+{
+ int ret;
+ uint8_t v[3];
+
+ rtc_tm->tm_year -= 100;
+ rtc_tm->tm_mon += 1;
+
+ ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
+ DA9052_RTC_MIN, rtc_tm->tm_min);
+ if (ret != 0) {
+ rtc_err(da9052, "Failed to write ALRM MIN: %d\n", ret);
+ return ret;
+ }
+
+ v[0] = rtc_tm->tm_hour;
+ v[1] = rtc_tm->tm_mday;
+ v[2] = rtc_tm->tm_mon;
+
+ ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
+ if (ret < 0)
+ return ret;
+
+ ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
+ DA9052_RTC_YEAR, rtc_tm->tm_year);
+ if (ret != 0)
+ rtc_err(da9052, "Failed to write ALRM YEAR: %d\n", ret);
+
+ return ret;
+}
+
+static int da9052_rtc_get_alarm_status(struct da9052 *da9052)
+{
+ int ret;
+
+ ret = da9052_reg_read(da9052, DA9052_ALARM_Y_REG);
+ if (ret < 0) {
+ rtc_err(da9052, "Failed to read ALM: %d\n", ret);
+ return ret;
+ }
+ ret &= DA9052_ALARM_Y_ALARM_ON;
+ return (ret > 0) ? 1 : 0;
+}
+
+static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
+{
+ struct da9052_rtc *rtc = dev_get_drvdata(dev);
+ uint8_t v[6];
+ int ret;
+
+ ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
+ if (ret < 0) {
+ rtc_err(rtc->da9052, "Failed to read RTC time : %d\n", ret);
+ return ret;
+ }
+
+ rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100;
+ rtc_tm->tm_mon = (v[4] & DA9052_RTC_MONTH) - 1;
+ rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY;
+ rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR;
+ rtc_tm->tm_min = v[1] & DA9052_RTC_MIN;
+ rtc_tm->tm_sec = v[0] & DA9052_RTC_SEC;
+
+ ret = rtc_valid_tm(rtc_tm);
+ if (ret != 0) {
+ rtc_err(rtc->da9052, "rtc_valid_tm failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct da9052_rtc *rtc;
+ uint8_t v[6];
+
+ rtc = dev_get_drvdata(dev);
+
+ v[0] = tm->tm_sec;
+ v[1] = tm->tm_min;
+ v[2] = tm->tm_hour;
+ v[3] = tm->tm_mday;
+ v[4] = tm->tm_mon + 1;
+ v[5] = tm->tm_year - 100;
+
+ return da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
+}
+
+static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ int ret;
+ struct rtc_time *tm = &alrm->time;
+ struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+ ret = da9052_read_alarm(rtc->da9052, tm);
+
+ if (ret)
+ return ret;
+
+ alrm->enabled = da9052_rtc_get_alarm_status(rtc->da9052);
+
+ return 0;
+}
+
+static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ int ret;
+ struct rtc_time *tm = &alrm->time;
+ struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+ ret = da9052_rtc_enable_alarm(rtc->da9052, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = da9052_set_alarm(rtc->da9052, tm);
+ if (ret)
+ return ret;
+
+ ret = da9052_rtc_enable_alarm(rtc->da9052, 1);
+
+ return ret;
+}
+
+static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+ return da9052_rtc_enable_alarm(rtc->da9052, enabled);
+}
+
+static const struct rtc_class_ops da9052_rtc_ops = {
+ .read_time = da9052_rtc_read_time,
+ .set_time = da9052_rtc_set_time,
+ .read_alarm = da9052_rtc_read_alarm,
+ .set_alarm = da9052_rtc_set_alarm,
+ .alarm_irq_enable = da9052_rtc_alarm_irq_enable,
+};
+
+static int __devinit da9052_rtc_probe(struct platform_device *pdev)
+{
+ struct da9052_rtc *rtc;
+ int ret;
+
+ rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
+ if (!rtc)
+ return -ENOMEM;
+
+ rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
+ platform_set_drvdata(pdev, rtc);
+ rtc->irq = platform_get_irq_byname(pdev, "ALM");
+ ret = request_threaded_irq(rtc->irq, NULL, da9052_rtc_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "ALM", rtc);
+ if (ret != 0) {
+ rtc_err(rtc->da9052, "irq registration failed: %d\n", ret);
+ goto err_mem;
+ }
+
+ rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
+ &da9052_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc->rtc)) {
+ ret = PTR_ERR(rtc->rtc);
+ goto err_free_irq;
+ }
+
+ return 0;
+
+err_free_irq:
+ free_irq(rtc->irq, rtc);
+err_mem:
+ devm_kfree(&pdev->dev, rtc);
+ return ret;
+}
+
+static int __devexit da9052_rtc_remove(struct platform_device *pdev)
+{
+ struct da9052_rtc *rtc = pdev->dev.platform_data;
+
+ rtc_device_unregister(rtc->rtc);
+ free_irq(rtc->irq, rtc);
+ platform_set_drvdata(pdev, NULL);
+ devm_kfree(&pdev->dev, rtc);
+
+ return 0;
+}
+
+static struct platform_driver da9052_rtc_driver = {
+ .probe = da9052_rtc_probe,
+ .remove = __devexit_p(da9052_rtc_remove),
+ .driver = {
+ .name = "da9052-rtc",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(da9052_rtc_driver);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-rtc");
projects / mirror_ubuntu-disco-kernel.git / commitdiff