On Tuesday 01 February 2011 08:31 PM, Varun Wadekar wrote:
> this driver supports setting of alarms, and
> reading/setting of time
>
> From: Gary King <gking@xxxxxxxxxx>
> Signed-off-by: Varun Wadekar <vwadekar@xxxxxxxxxx>
> ---
> v4: replaced update_irq_enable with alarm_irq_enable
>
> drivers/rtc/Kconfig | 6 +
> drivers/rtc/rtc-tps6586x.c | 332 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/tps6586x.h | 14 ++
> 3 files changed, 352 insertions(+), 0 deletions(-)
> create mode 100644 drivers/rtc/rtc-tps6586x.c
>
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 4941cad..3ab89ca 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -297,6 +297,12 @@ config RTC_DRV_DM355EVM
> help
> Supports the RTC firmware in the MSP430 on the DM355 EVM.
>
> +config RTC_DRV_TPS6586X
> + tristate "TI TPS6586X RTC"
> + depends on MFD_TPS6586X
> + help
> + This driver supports TPS6586X RTC
> +
> config RTC_DRV_TWL92330
> boolean "TI TWL92330/Menelaus"
> depends on MENELAUS
> diff --git a/drivers/rtc/rtc-tps6586x.c b/drivers/rtc/rtc-tps6586x.c
> new file mode 100644
> index 0000000..80aebb8
> --- /dev/null
> +++ b/drivers/rtc/rtc-tps6586x.c
> @@ -0,0 +1,332 @@
> +/*
> + * drivers/rtc/rtc-tps6586x.c
> + *
> + * RTC driver for TI TPS6586x
> + *
> + * Copyright (c) 2010, NVIDIA Corporation.
> + *
> + * 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.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/tps6586x.h>
> +#include <linux/platform_device.h>
> +#include <linux/rtc.h>
> +#include <linux/slab.h>
> +
> +#define RTC_CTRL 0xc0
> +#define RTC_ENABLE BIT(5) /* enables alarm */
> +#define RTC_HIRES BIT(4) /* 1Khz or 32Khz updates */
> +#define RTC_ALARM1_HI 0xc1
> +#define RTC_COUNT4 0xc6
> +
> +struct tps6586x_rtc {
> + unsigned long epoch_start;
> + int irq;
> + struct rtc_device *rtc;
> +};
> +
> +static inline struct device *to_tps6586x_dev(struct device *dev)
> +{
> + return dev->parent;
> +}
> +
> +static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm)
> +{
> + struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
> + struct device *tps_dev = to_tps6586x_dev(dev);
> + unsigned long long ticks = 0;
> + unsigned long seconds;
> + u8 buff[5];
> + int err;
> + int i;
> +
> + err = tps6586x_reads(tps_dev, RTC_COUNT4, sizeof(buff), buff);
> + if (err < 0) {
> + dev_err(dev, "failed to read counter\n");
> + return err;
> + }
> +
> + for (i = 0; i < sizeof(buff); i++) {
> + ticks <<= 8;
> + ticks |= buff[i];
> + }
> +
> + seconds = ticks >> 10;
> +
> + seconds += rtc->epoch_start;
> + rtc_time_to_tm(seconds, tm);
> + return rtc_valid_tm(tm);
> +}
> +
> +static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm)
> +{
> + struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
> + struct device *tps_dev = to_tps6586x_dev(dev);
> + unsigned long long ticks;
> + unsigned long seconds;
> + u8 buff[5];
> + int err;
> +
> + rtc_tm_to_time(tm, &seconds);
> +
> + if (WARN_ON(seconds < rtc->epoch_start)) {
> + dev_err(dev, "requested time unsupported\n");
> + return -EINVAL;
> + }
> +
> + seconds -= rtc->epoch_start;
> +
> + ticks = (unsigned long long)seconds << 10;
> + buff[0] = (ticks >> 32) & 0xff;
> + buff[1] = (ticks >> 24) & 0xff;
> + buff[2] = (ticks >> 16) & 0xff;
> + buff[3] = (ticks >> 8) & 0xff;
> + buff[4] = ticks & 0xff;
> +
> + err = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
> + if (err < 0) {
> + dev_err(dev, "failed to clear RTC_ENABLE\n");
> + return err;
> + }
> +
> + err = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff);
> + if (err < 0) {
> + dev_err(dev, "failed to program new time\n");
> + return err;
> + }
> +
> + err = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
> + if (err < 0) {
> + dev_err(dev, "failed to set RTC_ENABLE\n");
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
> + struct device *tps_dev = to_tps6586x_dev(dev);
> + unsigned long seconds;
> + unsigned long ticks;
> + u8 buff[3];
> + int err;
> +
> + if (rtc->irq == -1)
> + return -EIO;
> +
> + rtc_tm_to_time(&alrm->time, &seconds);
> +
> + if (WARN_ON(alrm->enabled && (seconds < rtc->epoch_start))) {
> + dev_err(dev, "can't set alarm to requested time\n");
> + return -EINVAL;
> + }
> +
> + seconds -= rtc->epoch_start;
> + ticks = (unsigned long long)seconds << 10;
> +
> + buff[0] = (ticks >> 16) & 0xff;
> + buff[1] = (ticks >> 8) & 0xff;
> + buff[2] = ticks & 0xff;
> +
> + err = tps6586x_writes(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
> + if (err)
> + dev_err(tps_dev, "unable to program alarm\n");
> +
> + return err;
> +}
> +
> +static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
> + struct device *tps_dev = to_tps6586x_dev(dev);
> + unsigned long ticks;
> + unsigned long seconds;
> + u8 buff[3];
> + int err;
> +
> + err = tps6586x_reads(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
> + if (err)
> + return err;
> +
> + ticks = (buff[0] << 16) | (buff[1] << 8) | buff[2];
> + seconds = ticks >> 10;
> + seconds += rtc->epoch_start;
> +
> + rtc_time_to_tm(seconds, &alrm->time);
> +
> + return 0;
> +}
> +
> +static int tps6586x_rtc_alarm_irq_enable(struct device *dev,
> + unsigned int enabled)
> +{
> + struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
> + struct device *tps_dev = to_tps6586x_dev(dev);
> + u8 buff;
> + int err;
> +
> + if (rtc->irq == -1)
> + return -EIO;
> +
> + err = tps6586x_read(tps_dev, RTC_CTRL, &buff);
> + if (err < 0) {
> + dev_err(dev, "failed to read RTC_CTRL\n");
> + return err;
> + }
> +
> + if ((enabled && (buff & RTC_ENABLE)) ||
> + (!enabled && !(buff & RTC_ENABLE)))
> + return 0;
> +
> + if (enabled) {
> + err = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
> + if (err < 0) {
> + dev_err(dev, "failed to set RTC_ENABLE\n");
> + return err;
> + }
> + enable_irq(rtc->irq);
> + } else {
> + err = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
> + if (err < 0) {
> + dev_err(dev, "failed to clear RTC_ENABLE\n");
> + return err;
> + }
> + disable_irq(rtc->irq);
> + }
> +
> + return 0;
> +}
> +
> +static const struct rtc_class_ops tps6586x_rtc_ops = {
> + .read_time = tps6586x_rtc_read_time,
> + .set_time = tps6586x_rtc_set_time,
> + .set_alarm = tps6586x_rtc_set_alarm,
> + .read_alarm = tps6586x_rtc_read_alarm,
> + .alarm_irq_enable = tps6586x_rtc_alarm_irq_enable,
> +};
> +
> +static irqreturn_t tps6586x_rtc_irq(int irq, void *data)
> +{
> + struct device *dev = data;
> + struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
> +
> + rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
> + return IRQ_HANDLED;
> +}
> +
> +static int __devinit tps6586x_rtc_probe(struct platform_device *pdev)
> +{
> + struct tps6586x_rtc_platform_data *pdata = pdev->dev.platform_data;
> + struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
> + struct tps6586x_rtc *rtc;
> + int err;
> + struct tps6586x_epoch_start *epoch;
> +
> + rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
> +
> + if (!rtc)
> + return -ENOMEM;
> +
> + rtc->irq = -1;
> + if (!pdata || (pdata->irq < 0))
> + dev_warn(&pdev->dev, "no IRQ specified, wakeup is disabled\n");
return error in case pdata is NULL.
> +
> + epoch = &pdata->start;
> + rtc->epoch_start = mktime(epoch->year, epoch->month, epoch->day,
> + epoch->hour, epoch->min, epoch->sec);
> +
> + rtc->rtc = rtc_device_register("tps6586x-rtc", &pdev->dev,
> + &tps6586x_rtc_ops, THIS_MODULE);
> +
> + if (IS_ERR(rtc->rtc)) {
> + err = PTR_ERR(rtc->rtc);
> + goto fail;
> + }
> +
> + /* disable high-res mode, enable tick counting */
> + err = tps6586x_update(tps_dev, RTC_CTRL,
> + (RTC_ENABLE | RTC_HIRES), RTC_ENABLE);
> + if (err < 0) {
> + dev_err(&pdev->dev, "unable to start counter\n");
> + goto fail;
> + }
> +
> + dev_set_drvdata(&pdev->dev, rtc);
> + if (pdata && (pdata->irq >= 0)) {
> + rtc->irq = pdata->irq;
> + err = request_threaded_irq(pdata->irq, NULL, tps6586x_rtc_irq,
> + IRQF_ONESHOT, "tps6586x-rtc",
> + &pdev->dev);
> + if (err) {
> + dev_warn(&pdev->dev, "unable to request IRQ(%d)\n", rtc->irq);
> + rtc->irq = -1;
> + } else {
> + device_init_wakeup(&pdev->dev, 1);
> + disable_irq(rtc->irq);
> + enable_irq_wake(rtc->irq);
> + }
> + }
> +
> + return 0;
> +
> +fail:
> + if (!IS_ERR_OR_NULL(rtc->rtc))
> + rtc_device_unregister(rtc->rtc);
> + kfree(rtc);
> + return err;
> +}
> +
> +static int __devexit tps6586x_rtc_remove(struct platform_device *pdev)
> +{
> + struct tps6586x_rtc *rtc = dev_get_drvdata(&pdev->dev);
> +
> + if (rtc->irq != -1)
> + free_irq(rtc->irq, rtc);
> + rtc_device_unregister(rtc->rtc);
> + kfree(rtc);
> + return 0;
> +}
> +
> +static struct platform_driver tps6586x_rtc_driver = {
> + .driver = {
> + .name = "tps6586x-rtc",
> + .owner = THIS_MODULE,
> + },
> + .probe = tps6586x_rtc_probe,
> + .remove = __devexit_p(tps6586x_rtc_remove),
> +};
> +
> +static int __init tps6586x_rtc_init(void)
> +{
> + return platform_driver_register(&tps6586x_rtc_driver);
> +}
> +module_init(tps6586x_rtc_init);
> +
> +static void __exit tps6586x_rtc_exit(void)
> +{
> + platform_driver_unregister(&tps6586x_rtc_driver);
> +}
> +module_exit(tps6586x_rtc_exit);
> +
> +MODULE_DESCRIPTION("TI TPS6586x RTC driver");
> +MODULE_AUTHOR("NVIDIA Corporation");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:rtc-tps6586x")
> diff --git a/include/linux/mfd/tps6586x.h b/include/linux/mfd/tps6586x.h
> index b6bab1b..eb5389c 100644
> --- a/include/linux/mfd/tps6586x.h
> +++ b/include/linux/mfd/tps6586x.h
> @@ -54,6 +54,20 @@ struct tps6586x_subdev_info {
> void *platform_data;
> };
>
> +struct tps6586x_epoch_start {
> + int year;
> + int month;
> + int day;
> + int hour;
> + int min;
> + int sec;
> +};
> +
> +struct tps6586x_rtc_platform_data {
> + int irq;
> + struct tps6586x_epoch_start start;
> +};
> +
> struct tps6586x_platform_data {
> int num_subdevs;
> struct tps6586x_subdev_info *subdevs;
Mark, do you have any more comments other than the one I just added?
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