rtc: driver for DA9052/53 PMIC v1

RTC Driver for Dialog Semiconductor DA9052/53 PMICs.

This patch is functionally tested on Samsung SMDKV6410.

[akpm@linux-foundation.org: clean up file header layout, remove unneeded initialisation of local arrays]
Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
Cc: David Dajun Chen <dchen@diasemi.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 293 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-da9052.c b/drivers/rtc/rtc-da9052.c
new file mode 100644
index 000000000000..da6ab5291a41
--- /dev/null
+++ b/drivers/rtc/rtc-da9052.c
@@ -0,0 +1,293 @@
+/*
+ * 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");