Initial Contribution
msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142
Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
diff --git a/drivers/rtc/rtc-pm8058.c b/drivers/rtc/rtc-pm8058.c
new file mode 100644
index 0000000..5d9111a
--- /dev/null
+++ b/drivers/rtc/rtc-pm8058.c
@@ -0,0 +1,563 @@
+/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rtc.h>
+#include <linux/mfd/pmic8058.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/rtc/rtc-pm8058.h>
+#include <linux/pm_runtime.h>
+
+#define PM8058_RTC_CTRL 0x1E8
+ #define PM8058_RTC_ENABLE BIT(7)
+ #define PM8058_RTC_ALARM_ENABLE BIT(1)
+#define PM8058_RTC_ALARM_CTRL 0x1E9
+ #define PM8058_RTC_ALARM_CLEAR BIT(0)
+#define PM8058_RTC_TEST 0x1F6
+#define PM8058_RTC_READ_BASE 0x1EE
+#define PM8058_RTC_WRITE_BASE 0x1EA
+#define PM8058_RTC_ALARM_BASE 0x1F2
+
+struct pm8058_rtc {
+ struct rtc_device *rtc0;
+ u8 rtc_ctrl_reg;
+ int rtc_irq;
+ int rtc_alarm_irq;
+ struct pm8058_chip *pm_chip;
+};
+
+static int
+pm8058_rtc_read_bytes(struct pm8058_rtc *rtc_dd, u8 *rtc_val, int base)
+{
+ int i, rc;
+
+ /*
+ * Read the 32-bit RTC/Alarm Value.
+ * These values have to be read 8-bit at a time.
+ */
+ for (i = 0; i < 4; i++) {
+ rc = pm8058_read(rtc_dd->pm_chip, base + i, &rtc_val[i], 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 read failed\n", __func__);
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+static int
+pm8058_rtc_write_bytes(struct pm8058_rtc *rtc_dd, u8 *rtc_val, int base)
+{
+ int i, rc;
+
+ /*
+ * Write the 32-bit Value.
+ * These values have to be written 8-bit at a time.
+ */
+ for (i = 0; i < 4; i++) {
+ rc = pm8058_write(rtc_dd->pm_chip, base + i, &rtc_val[i], 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 read failed\n", __func__);
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Steps to write the RTC registers.
+ * 1. Disable alarm if enabled.
+ * 2. Write 0x00 to LSB.
+ * 3. Write Byte[1], Byte[2], Byte[3] then Byte[0].
+ * 4. Enable alarm if disabled earlier.
+ */
+#ifdef CONFIG_RTC_PM8058_WRITE_ENABLE
+static int
+pm8058_rtc0_set_time(struct device *dev, struct rtc_time *tm)
+{
+ int rc;
+ unsigned long secs = 0;
+ u8 value[4], reg = 0, alarm_enabled = 0, ctrl_reg = 0, i;
+ struct pm8058_rtc *rtc_dd = dev_get_drvdata(dev);
+
+ ctrl_reg = rtc_dd->rtc_ctrl_reg;
+
+ rtc_tm_to_time(tm, &secs);
+
+ value[0] = secs & 0xFF;
+ value[1] = (secs >> 8) & 0xFF;
+ value[2] = (secs >> 16) & 0xFF;
+ value[3] = (secs >> 24) & 0xFF;
+
+ pr_debug("%s: Seconds value to be written to RTC = %lu\n", __func__,
+ secs);
+ /* Disable alarm before updating RTC */
+ if (ctrl_reg & PM8058_RTC_ALARM_ENABLE) {
+ alarm_enabled = 1;
+ ctrl_reg &= ~PM8058_RTC_ALARM_ENABLE;
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_CTRL,
+ &ctrl_reg, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ return rc;
+ }
+ }
+
+ /* Write Byte[1], Byte[2], Byte[3], Byte[0] */
+ reg = 0;
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_WRITE_BASE, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ return rc;
+ }
+
+ for (i = 1; i < 4; i++) {
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_WRITE_BASE + i,
+ &value[i], 1);
+ if (rc < 0) {
+ pr_err("%s:Write to RTC registers failed\n", __func__);
+ return rc;
+ }
+ }
+
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_WRITE_BASE,
+ &value[0], 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ return rc;
+ }
+
+ if (alarm_enabled) {
+ ctrl_reg |= PM8058_RTC_ALARM_ENABLE;
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_CTRL,
+ &ctrl_reg, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ return rc;
+ }
+ }
+
+ rtc_dd->rtc_ctrl_reg = ctrl_reg;
+
+ return 0;
+}
+#endif
+
+static int
+pm8058_rtc0_read_time(struct device *dev, struct rtc_time *tm)
+{
+ int rc;
+ u8 value[4], reg;
+ unsigned long secs = 0;
+ struct pm8058_rtc *rtc_dd = dev_get_drvdata(dev);
+
+ rc = pm8058_rtc_read_bytes(rtc_dd, value, PM8058_RTC_READ_BASE);
+ if (rc < 0) {
+ pr_err("%s: RTC time read failed\n", __func__);
+ return rc;
+ }
+
+ /*
+ * Read the LSB again and check if there has been a carry over.
+ * If there is, redo the read operation.
+ */
+ rc = pm8058_read(rtc_dd->pm_chip, PM8058_RTC_READ_BASE, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 read failed\n", __func__);
+ return rc;
+ }
+
+ if (unlikely(reg < value[0])) {
+ rc = pm8058_rtc_read_bytes(rtc_dd, value,
+ PM8058_RTC_READ_BASE);
+ if (rc < 0) {
+ pr_err("%s: RTC time read failed\n", __func__);
+ return rc;
+ }
+ }
+
+ secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
+
+ rtc_time_to_tm(secs, tm);
+
+ rc = rtc_valid_tm(tm);
+ if (rc < 0) {
+ pr_err("%s: Invalid time read from PMIC8058\n", __func__);
+ return rc;
+ }
+
+ pr_debug("%s: secs = %lu, h::m:s == %d::%d::%d, d/m/y = %d/%d/%d\n",
+ __func__, secs, tm->tm_hour, tm->tm_min, tm->tm_sec,
+ tm->tm_mday, tm->tm_mon, tm->tm_year);
+
+ return 0;
+}
+
+static int
+pm8058_rtc0_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ int rc;
+ u8 value[4], reg;
+ struct rtc_time rtc_tm;
+ unsigned long secs_alarm, secs_rtc;
+ struct pm8058_rtc *rtc_dd = dev_get_drvdata(dev);
+
+ reg = rtc_dd->rtc_ctrl_reg;
+
+ /* Check if the alarm is valid */
+ rc = rtc_valid_tm(&alarm->time);
+ if (rc < 0) {
+ pr_err("%s: Alarm time invalid\n", __func__);
+ return -EINVAL;
+ }
+
+ rtc_tm_to_time(&alarm->time, &secs_alarm);
+
+ /*
+ * Read the current RTC time and verify if the alarm time is in the
+ * past. If yes, return invalid.
+ */
+ rc = pm8058_rtc0_read_time(dev, &rtc_tm);
+ if (rc) {
+ pr_err("%s: Unable to read RTC time\n", __func__);
+ return -EINVAL;
+ }
+ rtc_tm_to_time(&rtc_tm, &secs_rtc);
+
+ if (secs_alarm < secs_rtc) {
+ pr_err("%s: Trying to set alarm in the past\n", __func__);
+ return -EINVAL;
+ }
+
+ value[0] = secs_alarm & 0xFF;
+ value[1] = (secs_alarm >> 8) & 0xFF;
+ value[2] = (secs_alarm >> 16) & 0xFF;
+ value[3] = (secs_alarm >> 24) & 0xFF;
+
+ rc = pm8058_rtc_write_bytes(rtc_dd, value, PM8058_RTC_ALARM_BASE);
+ if (rc < 0) {
+ pr_err("%s: Alarm could not be set\n", __func__);
+ return rc;
+ }
+
+ reg = (alarm->enabled) ? (reg | PM8058_RTC_ALARM_ENABLE) :
+ (reg & ~PM8058_RTC_ALARM_ENABLE);
+
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_CTRL, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ return rc;
+ }
+
+ rtc_dd->rtc_ctrl_reg = reg;
+
+ pr_debug("%s: Alarm Set for h:r:s=%d:%d:%d, d/m/y=%d/%d/%d\n",
+ __func__, alarm->time.tm_hour, alarm->time.tm_min,
+ alarm->time.tm_sec, alarm->time.tm_mday,
+ alarm->time.tm_mon, alarm->time.tm_year);
+
+ return 0;
+}
+
+static int
+pm8058_rtc0_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ int rc;
+ u8 value[4], reg;
+ unsigned long secs = 0;
+ struct pm8058_rtc *rtc_dd = dev_get_drvdata(dev);
+
+ reg = rtc_dd->rtc_ctrl_reg;
+
+ alarm->enabled = !!(reg & PM8058_RTC_ALARM_ENABLE);
+
+ rc = pm8058_rtc_read_bytes(rtc_dd, value,
+ PM8058_RTC_ALARM_BASE);
+ if (rc < 0) {
+ pr_err("%s: RTC alarm time read failed\n", __func__);
+ return rc;
+ }
+
+ secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
+
+ rtc_time_to_tm(secs, &alarm->time);
+
+ rc = rtc_valid_tm(&alarm->time);
+ if (rc < 0) {
+ pr_err("%s: Invalid time read from PMIC8058\n", __func__);
+ return rc;
+ }
+
+ pr_debug("%s: Alarm set for - h:r:s=%d:%d:%d, d/m/y=%d/%d/%d\n",
+ __func__, alarm->time.tm_hour, alarm->time.tm_min,
+ alarm->time.tm_sec, alarm->time.tm_mday,
+ alarm->time.tm_mon, alarm->time.tm_year);
+
+ return 0;
+}
+
+
+static int
+pm8058_rtc0_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+ int rc;
+ struct pm8058_rtc *rtc_dd = dev_get_drvdata(dev);
+ u8 reg;
+
+ reg = rtc_dd->rtc_ctrl_reg;
+ reg = (enable) ? (reg | PM8058_RTC_ALARM_ENABLE) :
+ (reg & ~PM8058_RTC_ALARM_ENABLE);
+
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_CTRL, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ return rc;
+ }
+
+ rtc_dd->rtc_ctrl_reg = reg;
+
+ return rc;
+}
+
+static struct rtc_class_ops pm8058_rtc0_ops = {
+ .read_time = pm8058_rtc0_read_time,
+ .set_alarm = pm8058_rtc0_set_alarm,
+ .read_alarm = pm8058_rtc0_read_alarm,
+ .alarm_irq_enable = pm8058_rtc0_alarm_irq_enable,
+};
+
+static irqreturn_t pm8058_alarm_trigger(int irq, void *dev_id)
+{
+ u8 reg;
+ int rc;
+ unsigned long events = 0;
+ struct pm8058_rtc *rtc_dd = dev_id;
+
+ events = RTC_IRQF | RTC_AF;
+ rtc_update_irq(rtc_dd->rtc0, 1, events);
+
+ pr_debug("%s: Alarm Triggered !!\n", __func__);
+
+ /* Clear the alarm enable bit */
+ reg = rtc_dd->rtc_ctrl_reg;
+
+ reg &= ~PM8058_RTC_ALARM_ENABLE;
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_CTRL,
+ ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ goto rtc_alarm_handled;
+ }
+
+ rtc_dd->rtc_ctrl_reg = reg;
+
+ /* Clear RTC alarm register */
+ rc = pm8058_read(rtc_dd->pm_chip, PM8058_RTC_ALARM_CTRL, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 read failed\n", __func__);
+ goto rtc_alarm_handled;
+ }
+
+ reg &= ~PM8058_RTC_ALARM_CLEAR;
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_ALARM_CTRL, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ goto rtc_alarm_handled;
+ }
+
+rtc_alarm_handled:
+ return IRQ_HANDLED;
+}
+
+static int __devinit pm8058_rtc_probe(struct platform_device *pdev)
+{
+ int rc;
+ u8 reg, reg_alarm;
+ struct pm8058_rtc *rtc_dd;
+ struct pm8058_chip *pm_chip;
+
+ pm_chip = platform_get_drvdata(pdev);
+ if (pm_chip == NULL) {
+ pr_err("%s: Invalid driver information\n", __func__);
+ return -ENXIO;
+ }
+
+ rtc_dd = kzalloc(sizeof(*rtc_dd), GFP_KERNEL);
+ if (rtc_dd == NULL) {
+ pr_err("%s: Unable to allocate memory\n", __func__);
+ return -ENOMEM;
+ }
+
+ /* Enable runtime PM ops, start in ACTIVE mode */
+ rc = pm_runtime_set_active(&pdev->dev);
+ if (rc < 0)
+ dev_dbg(&pdev->dev, "unable to set runtime pm state\n");
+ pm_runtime_enable(&pdev->dev);
+
+ rtc_dd->rtc_irq = platform_get_irq(pdev, 0);
+ rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 1);
+ if (!rtc_dd->rtc_alarm_irq || !rtc_dd->rtc_irq) {
+ pr_err("%s: RTC Alarm IRQ absent\n", __func__);
+ rc = -ENXIO;
+ goto fail_rtc_enable;
+ }
+
+ rtc_dd->pm_chip = pm_chip;
+
+ rc = pm8058_read(pm_chip, PM8058_RTC_CTRL, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 read failed\n", __func__);
+ goto fail_rtc_enable;
+ }
+
+ if (!(reg & PM8058_RTC_ENABLE)) {
+ /* Enable RTC, clear alarm register */
+ reg |= PM8058_RTC_ENABLE;
+ reg &= ~PM8058_RTC_ALARM_ENABLE;
+ rc = pm8058_write(pm_chip, PM8058_RTC_CTRL, ®, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ goto fail_rtc_enable;
+ }
+
+ /* Clear RTC alarm register */
+ rc = pm8058_read(rtc_dd->pm_chip, PM8058_RTC_ALARM_CTRL,
+ ®_alarm, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 read failed\n", __func__);
+ goto fail_rtc_enable;
+ }
+
+ reg_alarm &= ~PM8058_RTC_ALARM_CLEAR;
+ rc = pm8058_write(rtc_dd->pm_chip, PM8058_RTC_ALARM_CTRL,
+ ®_alarm, 1);
+ if (rc < 0) {
+ pr_err("%s: PM8058 write failed\n", __func__);
+ goto fail_rtc_enable;
+ }
+ }
+ rtc_dd->rtc_ctrl_reg = reg;
+
+#ifdef CONFIG_RTC_PM8058_WRITE_ENABLE
+ pm8058_rtc0_ops.set_time = pm8058_rtc0_set_time,
+#endif
+
+ /* Register the RTC device */
+ rtc_dd->rtc0 = rtc_device_register("pm8058_rtc0", &pdev->dev,
+ &pm8058_rtc0_ops, THIS_MODULE);
+ if (IS_ERR(rtc_dd->rtc0)) {
+ pr_err("%s: RTC device registration failed (%ld)\n",
+ __func__, PTR_ERR(rtc_dd->rtc0));
+ rc = PTR_ERR(rtc_dd->rtc0);
+ goto fail_rtc_enable;
+ }
+
+ platform_set_drvdata(pdev, rtc_dd);
+
+ /* Request the alarm IRQ */
+ rc = request_threaded_irq(rtc_dd->rtc_alarm_irq, NULL,
+ pm8058_alarm_trigger, IRQF_TRIGGER_RISING,
+ "pm8058_rtc_alarm", rtc_dd);
+ if (rc < 0) {
+ pr_err("%s: Request IRQ failed (%d)\n", __func__, rc);
+ goto fail_req_irq;
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ pr_debug("%s: Probe success !!\n", __func__);
+
+ return 0;
+
+fail_req_irq:
+ rtc_device_unregister(rtc_dd->rtc0);
+fail_rtc_enable:
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ kfree(rtc_dd);
+ return rc;
+}
+
+#ifdef CONFIG_PM
+static int pm8058_rtc_resume(struct device *dev)
+{
+ struct pm8058_rtc *rtc_dd = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(rtc_dd->rtc_alarm_irq);
+
+ return 0;
+}
+
+static int pm8058_rtc_suspend(struct device *dev)
+{
+ struct pm8058_rtc *rtc_dd = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(rtc_dd->rtc_alarm_irq);
+
+ return 0;
+}
+
+static struct dev_pm_ops pm8058_rtc_pm_ops = {
+ .suspend = pm8058_rtc_suspend,
+ .resume = pm8058_rtc_resume,
+};
+#endif
+
+static int __devexit pm8058_rtc_remove(struct platform_device *pdev)
+{
+ struct pm8058_rtc *rtc_dd = platform_get_drvdata(pdev);
+
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ device_init_wakeup(&pdev->dev, 0);
+ free_irq(rtc_dd->rtc_alarm_irq, rtc_dd);
+ rtc_device_unregister(rtc_dd->rtc0);
+ kfree(rtc_dd);
+
+ return 0;
+}
+
+static struct platform_driver pm8058_rtc_driver = {
+ .probe = pm8058_rtc_probe,
+ .remove = __devexit_p(pm8058_rtc_remove),
+ .driver = {
+ .name = "pm8058-rtc",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &pm8058_rtc_pm_ops,
+#endif
+ },
+};
+
+static int __init pm8058_rtc_init(void)
+{
+ return platform_driver_register(&pm8058_rtc_driver);
+}
+
+static void __exit pm8058_rtc_exit(void)
+{
+ platform_driver_unregister(&pm8058_rtc_driver);
+}
+
+module_init(pm8058_rtc_init);
+module_exit(pm8058_rtc_exit);
+
+MODULE_ALIAS("platform:pm8058-rtc");
+MODULE_DESCRIPTION("PMIC8058 RTC driver");
+MODULE_LICENSE("GPL v2");