[PATCHv1 3/11] RTC: RTC module of DA9052 PMIC driver
From: Ashish Jangam
Date: Thu Apr 14 2011 - 07:04:34 EST
Hi Joe,
RTC Driver for Dialog Semiconductor DA9052 PMICs.
Changes made since last submission:
. Directly calling 'request_threaded_irq' instead of calling MFD function
. Formatting changes done
. Defined a macro for error notification
. Ported on 2.6.38.2 kernel
Linux Kernel Version: 2.6.38.2
Signed-off-by: D. Chen <dchen@xxxxxxxxxxx>
---
diff -Naur linux-2.6.38.2/drivers/rtc/Kconfig wrk_linux-2.6.38.2/drivers/rtc/Kconfig
--- linux-2.6.38.2/drivers/rtc/Kconfig 2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/rtc/Kconfig 2011-04-14 14:38:59.000000000 +0500
@@ -475,6 +475,13 @@
style programming interface is mostly conserved, but any
updates are done via IPC calls to the system controller FW.
+config RTC_DRV_DA9052
+ tristate "Dialog DA9052 RTC"
+ depends on PMIC_DA9052
+ help
+ Say y here to support the RTC driver for
+ Dialog Semiconductor DA9052 PMIC.
+
config RTC_DRV_DS1216
tristate "Dallas DS1216"
depends on SNI_RM
diff -Naur linux-2.6.38.2/drivers/rtc/Makefile wrk_linux-2.6.38.2/drivers/rtc/Makefile
--- linux-2.6.38.2/drivers/rtc/Makefile 2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/rtc/Makefile 2011-04-14 14:43:16.000000000 +0500
@@ -28,6 +28,7 @@
obj-$(CONFIG_RTC_DRV_BQ4802) += rtc-bq4802.o
obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
+obj-$(CONFIG_RTC_DRV_DA9052) += rtc-da9052.o
obj-$(CONFIG_RTC_DRV_DAVINCI) += rtc-davinci.o
obj-$(CONFIG_RTC_DRV_DM355EVM) += rtc-dm355evm.o
obj-$(CONFIG_RTC_DRV_VRTC) += rtc-mrst.o
diff -Naur linux-2.6.38.2/drivers/rtc/rtc-da9052.c wrk_linux-2.6.38.2/drivers/rtc/rtc-da9052.c
--- linux-2.6.38.2/drivers/rtc/rtc-da9052.c 1970-01-01 05:00:00.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/rtc/rtc-da9052.c 2011-04-14 14:38:46.000000000 +0500
@@ -0,0 +1,340 @@
+/*
+ * Real time clock driver for DA9052
+ *
+ *Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ *Author: Dajun Chen <dajun.chen@xxxxxxxxxxx>
+ *
+ * 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/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 = 0;
+ if (enable) {
+ ret = da9052_set_bits(da9052, DA9052_ALARM_Y_REG,
+ DA9052_ALARM_Y_ALARM_ON);
+ if (ret != 0)
+ rtc_err(da9052, "Failed to enable ALM: %d\n", ret);
+ } else {
+ ret = da9052_clear_bits(da9052, DA9052_ALARM_Y_REG,
+ DA9052_ALARM_Y_ALARM_ON);
+ if (ret != 0)
+ rtc_err(da9052, "da9052_rtc_enable_alarm write error %d\n",
+ ret);
+ }
+ return ret;
+}
+
+static irqreturn_t da9052_rtc_irq(int irq, void *data)
+{
+ struct da9052_rtc *rtc = data;
+ int ret = 0;
+
+ ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_MI_REG);
+ if (ret < 0) {
+ rtc_err(rtc->da9052, "da9052_rtc_notifier read error %d\n",
+ ret);
+ return IRQ_NONE;
+ }
+ if (ret & DA9052_ALARMMI_ALARMTYPE)
+ da9052_rtc_enable_alarm(rtc->da9052, 0);
+
+ return IRQ_HANDLED;
+}
+
+static int da9052_read_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)
+{
+
+ int ret = 0;
+ uint8_t v[5] = {0, 0, 0, 0, 0};
+ 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;
+ rtc_tm->tm_mon = v[3] & DA9052_RTC_MONTH;
+ 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;
+
+ rtc_tm->tm_year += 100;
+ rtc_tm->tm_mon -= 1;
+
+ return ret;
+}
+
+static int da9052_set_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)
+{
+ int ret = 0;
+ uint8_t v[3] = {0, 0, 0};
+
+ rtc_tm->tm_sec = 0;
+ rtc_tm->tm_year -= 100;
+ rtc_tm->tm_mon += 1;
+
+ ret = rtc_valid_tm(rtc_tm);
+ if (ret)
+ return ret;
+
+ 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;
+ }
+
+ 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;
+ }
+
+ v[0] = rtc_tm->tm_hour;
+ v[1] = rtc_tm->tm_mday;
+ v[2] = rtc_tm->tm_mon;
+
+ return da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
+}
+
+static int da9052_rtc_get_alarm_status(struct da9052 *da9052)
+{
+ int ret = 0;
+ 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] = {0, 0, 0, 0, 0, 0};
+ 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;
+ rtc_tm->tm_mon = v[4] & DA9052_RTC_MONTH;
+ 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, "da9052_rtc_read_time valid time failed %d\n",
+ ret);
+ return ret;
+ }
+
+ rtc_tm->tm_year += 100;
+ rtc_tm->tm_mon -= 1;
+
+ return 0;
+}
+
+
+static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ int ret;
+ struct da9052_rtc *rtc;
+ uint8_t v[6] = {0, 0, 0, 0, 0, 0};
+
+ rtc = dev_get_drvdata(dev);
+
+ tm->tm_year -= 100;
+ tm->tm_mon += 1;
+
+ ret = rtc_valid_tm(tm);
+ if (ret != 0)
+ return ret;
+
+ 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;
+ v[5] = tm->tm_year;
+ 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 = 0;
+ 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 = 0;
+ struct rtc_time *tm = &alrm->time;
+ struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+ 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_update_irq_enable(struct device *dev,
+ unsigned int enabled)
+{
+ struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+ if (enabled)
+ return da9052_set_bits(rtc->da9052, DA9052_ALARM_Y_REG,
+ DA9052_ALARM_Y_TICK_ON);
+ else
+ return da9052_clear_bits(rtc->da9052, DA9052_ALARM_Y_REG,
+ DA9052_ALARM_Y_TICK_ON);
+}
+
+static int da9052_rtc_alarm_irq_enable(struct device *dev,
+ unsigned int enabled)
+{
+ struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+ if (enabled)
+ return da9052_rtc_enable_alarm(rtc->da9052, enabled);
+ else
+ 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,
+ .update_irq_enable = da9052_rtc_update_irq_enable,
+ .alarm_irq_enable = da9052_rtc_alarm_irq_enable,
+};
+
+static int __devinit da9052_rtc_probe(struct platform_device *pdev)
+{
+ struct da9052_rtc *rtc;
+ int ret = 0;
+
+ rtc = kzalloc(sizeof(struct da9052_rtc), GFP_KERNEL);
+ if (!rtc)
+ return -ENOMEM;
+
+ rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
+ rtc->irq = platform_get_irq_byname(pdev, "ALM");
+
+ ret = request_threaded_irq(rtc->da9052->irq_base + rtc->irq,
+ NULL, da9052_rtc_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "ALM", rtc);
+ if (ret != 0) {
+ rtc_err(rtc->da9052, "DA9052 RTC failed irq registration: %d\n",
+ ret);
+ goto err_mem;
+ }
+
+ da9052_set_bits(rtc->da9052, DA9052_ALARM_Y_REG,
+ DA9052_ALARM_Y_TICK_ON);
+
+ 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;
+ }
+
+ platform_set_drvdata(pdev, rtc);
+
+ return 0;
+
+err_free_irq:
+ free_irq(rtc->da9052->irq_base + rtc->irq, NULL);
+err_mem:
+ kfree(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->da9052->irq_base + rtc->irq, NULL);
+ platform_set_drvdata(pdev, NULL);
+ kfree(rtc);
+
+ return 0;
+}
+
+static struct platform_driver da9052_rtc_driver = {
+ .driver.name = "da9052-rtc",
+ .driver.owner = THIS_MODULE,
+ .probe = da9052_rtc_probe,
+ .remove = __devexit_p(da9052_rtc_remove),
+};
+
+static int __init da9052_rtc_init(void)
+{
+ return platform_driver_register(&da9052_rtc_driver);
+}
+module_init(da9052_rtc_init);
+
+static void __exit da9052_rtc_exit(void)
+{
+ platform_driver_unregister(&da9052_rtc_driver);
+}
+module_exit(da9052_rtc_exit);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:da9052-rtc");
+
Regards,
Ashish J
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