Added missing tegra files.HEADmaster

1 files changed, 323 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-max8907c.c b/drivers/rtc/rtc-max8907c.c
new file mode 100644
index 00000000000..f7287021da3
--- /dev/null
+++ b/drivers/rtc/rtc-max8907c.c
@@ -0,0 +1,323 @@
+/*
+ * RTC driver for Maxim MAX8907c
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ * Based on drivers/rtc/rtc-max8925.c, Copyright (C) 2009-2010 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/max8907c.h>
+
+enum {
+        RTC_SEC = 0,
+        RTC_MIN,
+        RTC_HOUR,
+        RTC_WEEKDAY,
+        RTC_DATE,
+        RTC_MONTH,
+        RTC_YEAR1,
+        RTC_YEAR2,
+};
+
+#define TIME_NUM                        8
+#define ALARM_1SEC                      (1 << 7)
+#define HOUR_12                         (1 << 7)
+#define HOUR_AM_PM                      (1 << 5)
+#define ALARM0_IRQ                      (1 << 3)
+#define ALARM1_IRQ                      (1 << 2)
+#define ALARM0_STATUS                   (1 << 2)
+#define ALARM1_STATUS                   (1 << 1)
+
+struct max8907c_rtc_info {
+        struct rtc_device       *rtc_dev;
+        struct i2c_client       *i2c;
+        struct max8907c         *chip;
+};
+
+static irqreturn_t rtc_update_handler(int irq, void *data)
+{
+        struct max8907c_rtc_info *info = (struct max8907c_rtc_info *)data;
+
+        /* disable ALARM0 except for 1SEC alarm */
+        max8907c_set_bits(info->i2c, MAX8907C_REG_ALARM0_CNTL, 0x7f, 0);
+        rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
+        return IRQ_HANDLED;
+}
+
+static int tm_calc(struct rtc_time *tm, u8 *buf, int len)
+{
+        if (len < TIME_NUM)
+                return -EINVAL;
+        tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
+                        + (buf[RTC_YEAR2] & 0xf) * 100
+                        + (buf[RTC_YEAR1] >> 4) * 10
+                        + (buf[RTC_YEAR1] & 0xf);
+        tm->tm_year -= 1900;
+        /* RTC month index issue in max8907c
+            : January index is 1 but kernel assumes it as 0 */
+        tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
+                        + (buf[RTC_MONTH] & 0x0f) - 1;
+        tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
+                        + (buf[RTC_DATE] & 0x0f);
+        tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
+        if (buf[RTC_HOUR] & HOUR_12) {
+                tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
+                                + (buf[RTC_HOUR] & 0x0f);
+                if (buf[RTC_HOUR] & HOUR_AM_PM)
+                        tm->tm_hour += 12;
+        } else {
+                tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
+                                + (buf[RTC_HOUR] & 0x0f);
+        }
+        tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
+                        + (buf[RTC_MIN] & 0x0f);
+        tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
+                        + (buf[RTC_SEC] & 0x0f);
+        return 0;
+}
+
+static int data_calc(u8 *buf, struct rtc_time *tm, int len)
+{
+        u8 high, low;
+
+        if (len < TIME_NUM)
+                return -EINVAL;
+
+        high = (tm->tm_year + 1900) / 1000;
+        low = (tm->tm_year + 1900) / 100;
+        low = low - high * 10;
+        buf[RTC_YEAR2] = (high << 4) + low;
+        high = (tm->tm_year + 1900) / 10;
+        low = tm->tm_year + 1900;
+        low = low - high * 10;
+        high = high - (high / 10) * 10;
+        buf[RTC_YEAR1] = (high << 4) + low;
+
+        /* RTC month index issue in max8907c
+            : January index is 1 but kernel assumes it as 0 */
+        high = (tm->tm_mon + 1) / 10;
+        low = (tm->tm_mon + 1) % 10;
+        buf[RTC_MONTH] = (high << 4) + low;
+
+        high = tm->tm_mday / 10;
+        low = tm->tm_mday;
+        low = low - high * 10;
+        buf[RTC_DATE] = (high << 4) + low;
+        buf[RTC_WEEKDAY] = tm->tm_wday;
+        high = tm->tm_hour / 10;
+        low = tm->tm_hour;
+        low = low - high * 10;
+        buf[RTC_HOUR] = (high << 4) + low;
+        high = tm->tm_min / 10;
+        low = tm->tm_min;
+        low = low - high * 10;
+        buf[RTC_MIN] = (high << 4) + low;
+        high = tm->tm_sec / 10;
+        low = tm->tm_sec;
+        low = low - high * 10;
+        buf[RTC_SEC] = (high << 4) + low;
+        return 0;
+}
+
+static int max8907c_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+        struct max8907c_rtc_info *info = dev_get_drvdata(dev);
+        u8 buf[TIME_NUM];
+        int ret;
+
+        ret = max8907c_reg_bulk_read(info->i2c, MAX8907C_REG_RTC_SEC, TIME_NUM, buf);
+
+        if (ret < 0)
+                return ret;
+        ret = tm_calc(tm, buf, TIME_NUM);
+
+        return ret;
+}
+
+static int max8907c_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+        struct max8907c_rtc_info *info = dev_get_drvdata(dev);
+        u8 buf[TIME_NUM];
+        int ret;
+
+        ret = data_calc(buf, tm, TIME_NUM);
+
+        if (ret < 0)
+                return ret;
+        ret = max8907c_reg_bulk_write(info->i2c, MAX8907C_REG_RTC_SEC, TIME_NUM, buf);
+
+        return ret;
+}
+
+static int max8907c_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct max8907c_rtc_info *info = dev_get_drvdata(dev);
+        unsigned char buf[TIME_NUM];
+        int ret;
+
+        ret = max8907c_reg_bulk_read(info->i2c, MAX8907C_REG_ALARM0_SEC, TIME_NUM, buf);
+        if (ret < 0)
+                return ret;
+        ret = tm_calc(&alrm->time, buf, TIME_NUM);
+        if (ret < 0)
+                return ret;
+        ret = max8907c_reg_read(info->i2c, MAX8907C_REG_RTC_IRQ_MASK);
+        if (ret < 0)
+                return ret;
+        if ((ret & ALARM0_IRQ) == 0)
+                alrm->enabled = 1;
+        else
+                alrm->enabled = 0;
+        ret = max8907c_reg_read(info->i2c, MAX8907C_REG_RTC_STATUS);
+        if (ret < 0)
+                return ret;
+        if (ret & ALARM0_STATUS)
+                alrm->pending = 1;
+        else
+                alrm->pending = 0;
+
+        return ret;
+}
+
+static int max8907c_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct max8907c_rtc_info *info = dev_get_drvdata(dev);
+        unsigned char buf[TIME_NUM];
+        int ret;
+
+        ret = data_calc(buf, &alrm->time, TIME_NUM);
+        if (ret < 0)
+                return ret;
+        ret = max8907c_reg_bulk_write(info->i2c, MAX8907C_REG_ALARM0_SEC, TIME_NUM, buf);
+        if (ret < 0)
+                return ret;
+        /* only enable alarm on year/month/day/hour/min/sec */
+        ret = max8907c_reg_write(info->i2c, MAX8907C_REG_ALARM0_CNTL, 0x77);
+
+        return ret;
+}
+
+static const struct rtc_class_ops max8907c_rtc_ops = {
+        .read_time      = max8907c_rtc_read_time,
+        .set_time       = max8907c_rtc_set_time,
+        .read_alarm     = max8907c_rtc_read_alarm,
+        .set_alarm      = max8907c_rtc_set_alarm,
+};
+
+static int __devinit max8907c_rtc_probe(struct platform_device *pdev)
+{
+        struct max8907c *chip = dev_get_drvdata(pdev->dev.parent);
+        struct max8907c_rtc_info *info;
+        int irq, ret;
+
+        info = kzalloc(sizeof(struct max8907c_rtc_info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+        info->i2c = chip->i2c_rtc;
+        info->chip = chip;
+
+        irq = chip->irq_base + MAX8907C_IRQ_RTC_ALARM0;
+
+        ret = request_threaded_irq(irq, NULL, rtc_update_handler,
+                                   IRQF_ONESHOT, "rtc-alarm0", info);
+        if (ret < 0) {
+                dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
+                        irq, ret);
+                goto out_irq;
+        }
+
+        dev_set_drvdata(&pdev->dev, info);
+        info->rtc_dev = rtc_device_register("max8907c-rtc", &pdev->dev,
+                                        &max8907c_rtc_ops, THIS_MODULE);
+        ret = PTR_ERR(info->rtc_dev);
+        if (IS_ERR(info->rtc_dev)) {
+                dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
+                goto out_rtc;
+        }
+
+        max8907c_set_bits(chip->i2c_power, MAX8907C_REG_SYSENSEL, 0x2, 0x2);
+
+        platform_set_drvdata(pdev, info);
+
+        device_init_wakeup(&pdev->dev, 1);
+
+        return 0;
+out_rtc:
+        free_irq(chip->irq_base + MAX8907C_IRQ_RTC_ALARM0, info);
+
+out_irq:
+        kfree(info);
+        return ret;
+}
+
+static int __devexit max8907c_rtc_remove(struct platform_device *pdev)
+{
+        struct max8907c_rtc_info *info = platform_get_drvdata(pdev);
+
+        if (info) {
+                free_irq(info->chip->irq_base + MAX8907C_IRQ_RTC_ALARM0, info);
+
+                rtc_device_unregister(info->rtc_dev);
+                kfree(info);
+        }
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int max8907c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct device *dev=&pdev->dev;
+        struct max8907c_rtc_info *info = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(dev))
+                enable_irq_wake(info->chip->irq_base + MAX8907C_IRQ_RTC_ALARM0);
+        return 0;
+}
+
+static int max8907c_rtc_resume(struct platform_device *pdev)
+{
+        struct device *dev=&pdev->dev;
+        struct max8907c_rtc_info *info = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(dev))
+                disable_irq_wake(info->chip->irq_base + MAX8907C_IRQ_RTC_ALARM0);
+        return 0;
+}
+#endif
+
+static struct platform_driver max8907c_rtc_driver = {
+        .driver         = {
+                .name   = "max8907c-rtc",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = max8907c_rtc_probe,
+        .remove         = __devexit_p(max8907c_rtc_remove),
+#ifdef CONFIG_PM
+        .suspend        = max8907c_rtc_suspend,
+        .resume         = max8907c_rtc_resume,
+#endif
+};
+
+static int __init max8907c_rtc_init(void)
+{
+        return platform_driver_register(&max8907c_rtc_driver);
+}
+module_init(max8907c_rtc_init);
+
+static void __exit max8907c_rtc_exit(void)
+{
+        platform_driver_unregister(&max8907c_rtc_driver);
+}
+module_exit(max8907c_rtc_exit);
+
+MODULE_DESCRIPTION("Maxim MAX8907C RTC driver");
+MODULE_LICENSE("GPL");
+