rtc: add new lp8788 rtc driver
authorKim, Milo <Milo.Kim@ti.com>
Fri, 22 Feb 2013 00:44:32 +0000 (16:44 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 22 Feb 2013 01:22:27 +0000 (17:22 -0800)
TI LP8788 PMU supports regulators, battery charger, RTC, ADC, backlight
driver and current sinks.  This patch enables LP8788 rtc module.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Cc: "devendra.aaru" <devendra.aaru@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/rtc/Kconfig
drivers/rtc/Makefile
drivers/rtc/rtc-lp8788.c [new file with mode: 0644]

index 7a8dd0c..e94ae65 100644 (file)
@@ -204,6 +204,12 @@ config RTC_DRV_DS3232
          This driver can also be built as a module.  If so, the module
          will be called rtc-ds3232.
 
+config RTC_DRV_LP8788
+       tristate "TI LP8788 RTC driver"
+       depends on MFD_LP8788
+       help
+         Say Y to enable support for the LP8788 RTC/ALARM driver.
+
 config RTC_DRV_MAX6900
        tristate "Maxim MAX6900"
        help
index 327c430..1a83776 100644 (file)
@@ -57,6 +57,7 @@ obj-$(CONFIG_RTC_DRV_IMXDI)   += rtc-imxdi.o
 obj-$(CONFIG_RTC_DRV_ISL1208)  += rtc-isl1208.o
 obj-$(CONFIG_RTC_DRV_ISL12022) += rtc-isl12022.o
 obj-$(CONFIG_RTC_DRV_JZ4740)   += rtc-jz4740.o
+obj-$(CONFIG_RTC_DRV_LP8788)   += rtc-lp8788.o
 obj-$(CONFIG_RTC_DRV_LPC32XX)  += rtc-lpc32xx.o
 obj-$(CONFIG_RTC_DRV_LOONGSON1)        += rtc-ls1x.o
 obj-$(CONFIG_RTC_DRV_M41T80)   += rtc-m41t80.o
diff --git a/drivers/rtc/rtc-lp8788.c b/drivers/rtc/rtc-lp8788.c
new file mode 100644 (file)
index 0000000..4a4e78e
--- /dev/null
@@ -0,0 +1,344 @@
+/*
+ * TI LP8788 MFD - rtc driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * 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/err.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+
+/* register address */
+#define LP8788_INTEN_3                 0x05
+#define LP8788_RTC_UNLOCK              0x64
+#define LP8788_RTC_SEC                 0x70
+#define LP8788_ALM1_SEC                        0x77
+#define LP8788_ALM1_EN                 0x7D
+#define LP8788_ALM2_SEC                        0x7E
+#define LP8788_ALM2_EN                 0x84
+
+/* mask/shift bits */
+#define LP8788_INT_RTC_ALM1_M          BIT(1)  /* Addr 05h */
+#define LP8788_INT_RTC_ALM1_S          1
+#define LP8788_INT_RTC_ALM2_M          BIT(2)  /* Addr 05h */
+#define LP8788_INT_RTC_ALM2_S          2
+#define LP8788_ALM_EN_M                        BIT(7)  /* Addr 7Dh or 84h */
+#define LP8788_ALM_EN_S                        7
+
+#define DEFAULT_ALARM_SEL              LP8788_ALARM_1
+#define LP8788_MONTH_OFFSET            1
+#define LP8788_BASE_YEAR               2000
+#define MAX_WDAY_BITS                  7
+#define LP8788_WDAY_SET                        1
+#define RTC_UNLOCK                     0x1
+#define RTC_LATCH                      0x2
+#define ALARM_IRQ_FLAG                 (RTC_IRQF | RTC_AF)
+
+enum lp8788_time {
+       LPTIME_SEC,
+       LPTIME_MIN,
+       LPTIME_HOUR,
+       LPTIME_MDAY,
+       LPTIME_MON,
+       LPTIME_YEAR,
+       LPTIME_WDAY,
+       LPTIME_MAX,
+};
+
+struct lp8788_rtc {
+       struct lp8788 *lp;
+       struct rtc_device *rdev;
+       enum lp8788_alarm_sel alarm;
+       int irq;
+};
+
+static const u8 addr_alarm_sec[LP8788_ALARM_MAX] = {
+       LP8788_ALM1_SEC,
+       LP8788_ALM2_SEC,
+};
+
+static const u8 addr_alarm_en[LP8788_ALARM_MAX] = {
+       LP8788_ALM1_EN,
+       LP8788_ALM2_EN,
+};
+
+static const u8 mask_alarm_en[LP8788_ALARM_MAX] = {
+       LP8788_INT_RTC_ALM1_M,
+       LP8788_INT_RTC_ALM2_M,
+};
+
+static const u8 shift_alarm_en[LP8788_ALARM_MAX] = {
+       LP8788_INT_RTC_ALM1_S,
+       LP8788_INT_RTC_ALM2_S,
+};
+
+static int _to_tm_wday(u8 lp8788_wday)
+{
+       int i;
+
+       if (lp8788_wday == 0)
+               return 0;
+
+       /* lookup defined weekday from read register value */
+       for (i = 0; i < MAX_WDAY_BITS; i++) {
+               if ((lp8788_wday >> i) == LP8788_WDAY_SET)
+                       break;
+       }
+
+       return i + 1;
+}
+
+static inline int _to_lp8788_wday(int tm_wday)
+{
+       return LP8788_WDAY_SET << (tm_wday - 1);
+}
+
+static void lp8788_rtc_unlock(struct lp8788 *lp)
+{
+       lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_UNLOCK);
+       lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_LATCH);
+}
+
+static int lp8788_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+       struct lp8788_rtc *rtc = dev_get_drvdata(dev);
+       struct lp8788 *lp = rtc->lp;
+       u8 data[LPTIME_MAX];
+       int ret;
+
+       lp8788_rtc_unlock(lp);
+
+       ret = lp8788_read_multi_bytes(lp, LP8788_RTC_SEC, data, LPTIME_MAX);
+       if (ret)
+               return ret;
+
+       tm->tm_sec  = data[LPTIME_SEC];
+       tm->tm_min  = data[LPTIME_MIN];
+       tm->tm_hour = data[LPTIME_HOUR];
+       tm->tm_mday = data[LPTIME_MDAY];
+       tm->tm_mon  = data[LPTIME_MON] - LP8788_MONTH_OFFSET;
+       tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;
+       tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]);
+
+       return 0;
+}
+
+static int lp8788_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+       struct lp8788_rtc *rtc = dev_get_drvdata(dev);
+       struct lp8788 *lp = rtc->lp;
+       u8 data[LPTIME_MAX - 1];
+       int ret, i, year;
+
+       year = tm->tm_year + 1900 - LP8788_BASE_YEAR;
+       if (year < 0) {
+               dev_err(lp->dev, "invalid year: %d\n", year);
+               return -EINVAL;
+       }
+
+       /* because rtc weekday is a readonly register, do not update */
+       data[LPTIME_SEC]  = tm->tm_sec;
+       data[LPTIME_MIN]  = tm->tm_min;
+       data[LPTIME_HOUR] = tm->tm_hour;
+       data[LPTIME_MDAY] = tm->tm_mday;
+       data[LPTIME_MON]  = tm->tm_mon + LP8788_MONTH_OFFSET;
+       data[LPTIME_YEAR] = year;
+
+       for (i = 0; i < ARRAY_SIZE(data); i++) {
+               ret = lp8788_write_byte(lp, LP8788_RTC_SEC + i, data[i]);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+static int lp8788_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+       struct lp8788_rtc *rtc = dev_get_drvdata(dev);
+       struct lp8788 *lp = rtc->lp;
+       struct rtc_time *tm = &alarm->time;
+       u8 addr, data[LPTIME_MAX];
+       int ret;
+
+       addr = addr_alarm_sec[rtc->alarm];
+       ret = lp8788_read_multi_bytes(lp, addr, data, LPTIME_MAX);
+       if (ret)
+               return ret;
+
+       tm->tm_sec  = data[LPTIME_SEC];
+       tm->tm_min  = data[LPTIME_MIN];
+       tm->tm_hour = data[LPTIME_HOUR];
+       tm->tm_mday = data[LPTIME_MDAY];
+       tm->tm_mon  = data[LPTIME_MON] - LP8788_MONTH_OFFSET;
+       tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;
+       tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]);
+       alarm->enabled = data[LPTIME_WDAY] & LP8788_ALM_EN_M;
+
+       return 0;
+}
+
+static int lp8788_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+       struct lp8788_rtc *rtc = dev_get_drvdata(dev);
+       struct lp8788 *lp = rtc->lp;
+       struct rtc_time *tm = &alarm->time;
+       u8 addr, data[LPTIME_MAX];
+       int ret, i, year;
+
+       year = tm->tm_year + 1900 - LP8788_BASE_YEAR;
+       if (year < 0) {
+               dev_err(lp->dev, "invalid year: %d\n", year);
+               return -EINVAL;
+       }
+
+       data[LPTIME_SEC]  = tm->tm_sec;
+       data[LPTIME_MIN]  = tm->tm_min;
+       data[LPTIME_HOUR] = tm->tm_hour;
+       data[LPTIME_MDAY] = tm->tm_mday;
+       data[LPTIME_MON]  = tm->tm_mon + LP8788_MONTH_OFFSET;
+       data[LPTIME_YEAR] = year;
+       data[LPTIME_WDAY] = _to_lp8788_wday(tm->tm_wday);
+
+       for (i = 0; i < ARRAY_SIZE(data); i++) {
+               addr = addr_alarm_sec[rtc->alarm] + i;
+               ret = lp8788_write_byte(lp, addr, data[i]);
+               if (ret)
+                       return ret;
+       }
+
+       alarm->enabled = 1;
+       addr = addr_alarm_en[rtc->alarm];
+
+       return lp8788_update_bits(lp, addr, LP8788_ALM_EN_M,
+                               alarm->enabled << LP8788_ALM_EN_S);
+}
+
+static int lp8788_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+       struct lp8788_rtc *rtc = dev_get_drvdata(dev);
+       struct lp8788 *lp = rtc->lp;
+       u8 mask, shift;
+
+       if (!rtc->irq)
+               return -EIO;
+
+       mask = mask_alarm_en[rtc->alarm];
+       shift = shift_alarm_en[rtc->alarm];
+
+       return lp8788_update_bits(lp, LP8788_INTEN_3, mask, enable << shift);
+}
+
+static const struct rtc_class_ops lp8788_rtc_ops = {
+       .read_time = lp8788_rtc_read_time,
+       .set_time = lp8788_rtc_set_time,
+       .read_alarm = lp8788_read_alarm,
+       .set_alarm = lp8788_set_alarm,
+       .alarm_irq_enable = lp8788_alarm_irq_enable,
+};
+
+static irqreturn_t lp8788_alarm_irq_handler(int irq, void *ptr)
+{
+       struct lp8788_rtc *rtc = ptr;
+
+       rtc_update_irq(rtc->rdev, 1, ALARM_IRQ_FLAG);
+       return IRQ_HANDLED;
+}
+
+static int lp8788_alarm_irq_register(struct platform_device *pdev,
+                               struct lp8788_rtc *rtc)
+{
+       struct resource *r;
+       struct lp8788 *lp = rtc->lp;
+       struct irq_domain *irqdm = lp->irqdm;
+       int irq;
+
+       rtc->irq = 0;
+
+       /* even the alarm IRQ number is not specified, rtc time should work */
+       r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, LP8788_ALM_IRQ);
+       if (!r)
+               return 0;
+
+       if (rtc->alarm == LP8788_ALARM_1)
+               irq = r->start;
+       else
+               irq = r->end;
+
+       rtc->irq = irq_create_mapping(irqdm, irq);
+
+       return request_threaded_irq(rtc->irq, NULL, lp8788_alarm_irq_handler,
+                               0, LP8788_ALM_IRQ, rtc);
+}
+
+static void lp8788_alarm_irq_unregister(struct lp8788_rtc *rtc)
+{
+       if (rtc->irq)
+               free_irq(rtc->irq, rtc);
+}
+
+static int lp8788_rtc_probe(struct platform_device *pdev)
+{
+       struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
+       struct lp8788_rtc *rtc;
+       struct device *dev = &pdev->dev;
+
+       rtc = devm_kzalloc(dev, sizeof(struct lp8788_rtc), GFP_KERNEL);
+       if (!rtc)
+               return -ENOMEM;
+
+       rtc->lp = lp;
+       rtc->alarm = lp->pdata ? lp->pdata->alarm_sel : DEFAULT_ALARM_SEL;
+       platform_set_drvdata(pdev, rtc);
+
+       device_init_wakeup(dev, 1);
+
+       rtc->rdev = rtc_device_register("lp8788_rtc", dev,
+                                       &lp8788_rtc_ops, THIS_MODULE);
+       if (IS_ERR(rtc->rdev)) {
+               dev_err(dev, "can not register rtc device\n");
+               return PTR_ERR(rtc->rdev);
+       }
+
+       if (lp8788_alarm_irq_register(pdev, rtc))
+               dev_warn(lp->dev, "no rtc irq handler\n");
+
+       return 0;
+}
+
+static int lp8788_rtc_remove(struct platform_device *pdev)
+{
+       struct lp8788_rtc *rtc = platform_get_drvdata(pdev);
+
+       lp8788_alarm_irq_unregister(rtc);
+       rtc_device_unregister(rtc->rdev);
+       platform_set_drvdata(pdev, NULL);
+
+       return 0;
+}
+
+static struct platform_driver lp8788_rtc_driver = {
+       .probe = lp8788_rtc_probe,
+       .remove = lp8788_rtc_remove,
+       .driver = {
+               .name = LP8788_DEV_RTC,
+               .owner = THIS_MODULE,
+       },
+};
+module_platform_driver(lp8788_rtc_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LP8788 RTC Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lp8788-rtc");