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Diffstat (limited to 'ANDROID_3.4.5/drivers/rtc/rtc-ab8500.c')
-rw-r--r--ANDROID_3.4.5/drivers/rtc/rtc-ab8500.c470
1 files changed, 0 insertions, 470 deletions
diff --git a/ANDROID_3.4.5/drivers/rtc/rtc-ab8500.c b/ANDROID_3.4.5/drivers/rtc/rtc-ab8500.c
deleted file mode 100644
index b11a2ece..00000000
--- a/ANDROID_3.4.5/drivers/rtc/rtc-ab8500.c
+++ /dev/null
@@ -1,470 +0,0 @@
-/*
- * Copyright (C) ST-Ericsson SA 2010
- *
- * License terms: GNU General Public License (GPL) version 2
- * Author: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
- *
- * RTC clock driver for the RTC part of the AB8500 Power management chip.
- * Based on RTC clock driver for the AB3100 Analog Baseband Chip by
- * Linus Walleij <linus.walleij@stericsson.com>
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/rtc.h>
-#include <linux/mfd/abx500.h>
-#include <linux/mfd/abx500/ab8500.h>
-#include <linux/delay.h>
-
-#define AB8500_RTC_SOFF_STAT_REG 0x00
-#define AB8500_RTC_CC_CONF_REG 0x01
-#define AB8500_RTC_READ_REQ_REG 0x02
-#define AB8500_RTC_WATCH_TSECMID_REG 0x03
-#define AB8500_RTC_WATCH_TSECHI_REG 0x04
-#define AB8500_RTC_WATCH_TMIN_LOW_REG 0x05
-#define AB8500_RTC_WATCH_TMIN_MID_REG 0x06
-#define AB8500_RTC_WATCH_TMIN_HI_REG 0x07
-#define AB8500_RTC_ALRM_MIN_LOW_REG 0x08
-#define AB8500_RTC_ALRM_MIN_MID_REG 0x09
-#define AB8500_RTC_ALRM_MIN_HI_REG 0x0A
-#define AB8500_RTC_STAT_REG 0x0B
-#define AB8500_RTC_BKUP_CHG_REG 0x0C
-#define AB8500_RTC_FORCE_BKUP_REG 0x0D
-#define AB8500_RTC_CALIB_REG 0x0E
-#define AB8500_RTC_SWITCH_STAT_REG 0x0F
-
-/* RtcReadRequest bits */
-#define RTC_READ_REQUEST 0x01
-#define RTC_WRITE_REQUEST 0x02
-
-/* RtcCtrl bits */
-#define RTC_ALARM_ENA 0x04
-#define RTC_STATUS_DATA 0x01
-
-#define COUNTS_PER_SEC (0xF000 / 60)
-#define AB8500_RTC_EPOCH 2000
-
-static const u8 ab8500_rtc_time_regs[] = {
- AB8500_RTC_WATCH_TMIN_HI_REG, AB8500_RTC_WATCH_TMIN_MID_REG,
- AB8500_RTC_WATCH_TMIN_LOW_REG, AB8500_RTC_WATCH_TSECHI_REG,
- AB8500_RTC_WATCH_TSECMID_REG
-};
-
-static const u8 ab8500_rtc_alarm_regs[] = {
- AB8500_RTC_ALRM_MIN_HI_REG, AB8500_RTC_ALRM_MIN_MID_REG,
- AB8500_RTC_ALRM_MIN_LOW_REG
-};
-
-/* Calculate the seconds from 1970 to 01-01-2000 00:00:00 */
-static unsigned long get_elapsed_seconds(int year)
-{
- unsigned long secs;
- struct rtc_time tm = {
- .tm_year = year - 1900,
- .tm_mday = 1,
- };
-
- /*
- * This function calculates secs from 1970 and not from
- * 1900, even if we supply the offset from year 1900.
- */
- rtc_tm_to_time(&tm, &secs);
- return secs;
-}
-
-static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
- unsigned long timeout = jiffies + HZ;
- int retval, i;
- unsigned long mins, secs;
- unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)];
- u8 value;
-
- /* Request a data read */
- retval = abx500_set_register_interruptible(dev,
- AB8500_RTC, AB8500_RTC_READ_REQ_REG, RTC_READ_REQUEST);
- if (retval < 0)
- return retval;
-
- /* Early AB8500 chips will not clear the rtc read request bit */
- if (abx500_get_chip_id(dev) == 0) {
- usleep_range(1000, 1000);
- } else {
- /* Wait for some cycles after enabling the rtc read in ab8500 */
- while (time_before(jiffies, timeout)) {
- retval = abx500_get_register_interruptible(dev,
- AB8500_RTC, AB8500_RTC_READ_REQ_REG, &value);
- if (retval < 0)
- return retval;
-
- if (!(value & RTC_READ_REQUEST))
- break;
-
- usleep_range(1000, 5000);
- }
- }
-
- /* Read the Watchtime registers */
- for (i = 0; i < ARRAY_SIZE(ab8500_rtc_time_regs); i++) {
- retval = abx500_get_register_interruptible(dev,
- AB8500_RTC, ab8500_rtc_time_regs[i], &value);
- if (retval < 0)
- return retval;
- buf[i] = value;
- }
-
- mins = (buf[0] << 16) | (buf[1] << 8) | buf[2];
-
- secs = (buf[3] << 8) | buf[4];
- secs = secs / COUNTS_PER_SEC;
- secs = secs + (mins * 60);
-
- /* Add back the initially subtracted number of seconds */
- secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
-
- rtc_time_to_tm(secs, tm);
- return rtc_valid_tm(tm);
-}
-
-static int ab8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
- int retval, i;
- unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)];
- unsigned long no_secs, no_mins, secs = 0;
-
- if (tm->tm_year < (AB8500_RTC_EPOCH - 1900)) {
- dev_dbg(dev, "year should be equal to or greater than %d\n",
- AB8500_RTC_EPOCH);
- return -EINVAL;
- }
-
- /* Get the number of seconds since 1970 */
- rtc_tm_to_time(tm, &secs);
-
- /*
- * Convert it to the number of seconds since 01-01-2000 00:00:00, since
- * we only have a small counter in the RTC.
- */
- secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
-
- no_mins = secs / 60;
-
- no_secs = secs % 60;
- /* Make the seconds count as per the RTC resolution */
- no_secs = no_secs * COUNTS_PER_SEC;
-
- buf[4] = no_secs & 0xFF;
- buf[3] = (no_secs >> 8) & 0xFF;
-
- buf[2] = no_mins & 0xFF;
- buf[1] = (no_mins >> 8) & 0xFF;
- buf[0] = (no_mins >> 16) & 0xFF;
-
- for (i = 0; i < ARRAY_SIZE(ab8500_rtc_time_regs); i++) {
- retval = abx500_set_register_interruptible(dev, AB8500_RTC,
- ab8500_rtc_time_regs[i], buf[i]);
- if (retval < 0)
- return retval;
- }
-
- /* Request a data write */
- return abx500_set_register_interruptible(dev, AB8500_RTC,
- AB8500_RTC_READ_REQ_REG, RTC_WRITE_REQUEST);
-}
-
-static int ab8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
-{
- int retval, i;
- u8 rtc_ctrl, value;
- unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)];
- unsigned long secs, mins;
-
- /* Check if the alarm is enabled or not */
- retval = abx500_get_register_interruptible(dev, AB8500_RTC,
- AB8500_RTC_STAT_REG, &rtc_ctrl);
- if (retval < 0)
- return retval;
-
- if (rtc_ctrl & RTC_ALARM_ENA)
- alarm->enabled = 1;
- else
- alarm->enabled = 0;
-
- alarm->pending = 0;
-
- for (i = 0; i < ARRAY_SIZE(ab8500_rtc_alarm_regs); i++) {
- retval = abx500_get_register_interruptible(dev, AB8500_RTC,
- ab8500_rtc_alarm_regs[i], &value);
- if (retval < 0)
- return retval;
- buf[i] = value;
- }
-
- mins = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
- secs = mins * 60;
-
- /* Add back the initially subtracted number of seconds */
- secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
-
- rtc_time_to_tm(secs, &alarm->time);
-
- return rtc_valid_tm(&alarm->time);
-}
-
-static int ab8500_rtc_irq_enable(struct device *dev, unsigned int enabled)
-{
- return abx500_mask_and_set_register_interruptible(dev, AB8500_RTC,
- AB8500_RTC_STAT_REG, RTC_ALARM_ENA,
- enabled ? RTC_ALARM_ENA : 0);
-}
-
-static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
-{
- int retval, i;
- unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)];
- unsigned long mins, secs = 0;
-
- if (alarm->time.tm_year < (AB8500_RTC_EPOCH - 1900)) {
- dev_dbg(dev, "year should be equal to or greater than %d\n",
- AB8500_RTC_EPOCH);
- return -EINVAL;
- }
-
- /* Get the number of seconds since 1970 */
- rtc_tm_to_time(&alarm->time, &secs);
-
- /*
- * Convert it to the number of seconds since 01-01-2000 00:00:00, since
- * we only have a small counter in the RTC.
- */
- secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
-
- mins = secs / 60;
-
- buf[2] = mins & 0xFF;
- buf[1] = (mins >> 8) & 0xFF;
- buf[0] = (mins >> 16) & 0xFF;
-
- /* Set the alarm time */
- for (i = 0; i < ARRAY_SIZE(ab8500_rtc_alarm_regs); i++) {
- retval = abx500_set_register_interruptible(dev, AB8500_RTC,
- ab8500_rtc_alarm_regs[i], buf[i]);
- if (retval < 0)
- return retval;
- }
-
- return ab8500_rtc_irq_enable(dev, alarm->enabled);
-}
-
-
-static int ab8500_rtc_set_calibration(struct device *dev, int calibration)
-{
- int retval;
- u8 rtccal = 0;
-
- /*
- * Check that the calibration value (which is in units of 0.5
- * parts-per-million) is in the AB8500's range for RtcCalibration
- * register. -128 (0x80) is not permitted because the AB8500 uses
- * a sign-bit rather than two's complement, so 0x80 is just another
- * representation of zero.
- */
- if ((calibration < -127) || (calibration > 127)) {
- dev_err(dev, "RtcCalibration value outside permitted range\n");
- return -EINVAL;
- }
-
- /*
- * The AB8500 uses sign (in bit7) and magnitude (in bits0-7)
- * so need to convert to this sort of representation before writing
- * into RtcCalibration register...
- */
- if (calibration >= 0)
- rtccal = 0x7F & calibration;
- else
- rtccal = ~(calibration - 1) | 0x80;
-
- retval = abx500_set_register_interruptible(dev, AB8500_RTC,
- AB8500_RTC_CALIB_REG, rtccal);
-
- return retval;
-}
-
-static int ab8500_rtc_get_calibration(struct device *dev, int *calibration)
-{
- int retval;
- u8 rtccal = 0;
-
- retval = abx500_get_register_interruptible(dev, AB8500_RTC,
- AB8500_RTC_CALIB_REG, &rtccal);
- if (retval >= 0) {
- /*
- * The AB8500 uses sign (in bit7) and magnitude (in bits0-7)
- * so need to convert value from RtcCalibration register into
- * a two's complement signed value...
- */
- if (rtccal & 0x80)
- *calibration = 0 - (rtccal & 0x7F);
- else
- *calibration = 0x7F & rtccal;
- }
-
- return retval;
-}
-
-static ssize_t ab8500_sysfs_store_rtc_calibration(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- int retval;
- int calibration = 0;
-
- if (sscanf(buf, " %i ", &calibration) != 1) {
- dev_err(dev, "Failed to store RTC calibration attribute\n");
- return -EINVAL;
- }
-
- retval = ab8500_rtc_set_calibration(dev, calibration);
-
- return retval ? retval : count;
-}
-
-static ssize_t ab8500_sysfs_show_rtc_calibration(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- int retval = 0;
- int calibration = 0;
-
- retval = ab8500_rtc_get_calibration(dev, &calibration);
- if (retval < 0) {
- dev_err(dev, "Failed to read RTC calibration attribute\n");
- sprintf(buf, "0\n");
- return retval;
- }
-
- return sprintf(buf, "%d\n", calibration);
-}
-
-static DEVICE_ATTR(rtc_calibration, S_IRUGO | S_IWUSR,
- ab8500_sysfs_show_rtc_calibration,
- ab8500_sysfs_store_rtc_calibration);
-
-static int ab8500_sysfs_rtc_register(struct device *dev)
-{
- return device_create_file(dev, &dev_attr_rtc_calibration);
-}
-
-static void ab8500_sysfs_rtc_unregister(struct device *dev)
-{
- device_remove_file(dev, &dev_attr_rtc_calibration);
-}
-
-static irqreturn_t rtc_alarm_handler(int irq, void *data)
-{
- struct rtc_device *rtc = data;
- unsigned long events = RTC_IRQF | RTC_AF;
-
- dev_dbg(&rtc->dev, "%s\n", __func__);
- rtc_update_irq(rtc, 1, events);
-
- return IRQ_HANDLED;
-}
-
-static const struct rtc_class_ops ab8500_rtc_ops = {
- .read_time = ab8500_rtc_read_time,
- .set_time = ab8500_rtc_set_time,
- .read_alarm = ab8500_rtc_read_alarm,
- .set_alarm = ab8500_rtc_set_alarm,
- .alarm_irq_enable = ab8500_rtc_irq_enable,
-};
-
-static int __devinit ab8500_rtc_probe(struct platform_device *pdev)
-{
- int err;
- struct rtc_device *rtc;
- u8 rtc_ctrl;
- int irq;
-
- irq = platform_get_irq_byname(pdev, "ALARM");
- if (irq < 0)
- return irq;
-
- /* For RTC supply test */
- err = abx500_mask_and_set_register_interruptible(&pdev->dev, AB8500_RTC,
- AB8500_RTC_STAT_REG, RTC_STATUS_DATA, RTC_STATUS_DATA);
- if (err < 0)
- return err;
-
- /* Wait for reset by the PorRtc */
- usleep_range(1000, 5000);
-
- err = abx500_get_register_interruptible(&pdev->dev, AB8500_RTC,
- AB8500_RTC_STAT_REG, &rtc_ctrl);
- if (err < 0)
- return err;
-
- /* Check if the RTC Supply fails */
- if (!(rtc_ctrl & RTC_STATUS_DATA)) {
- dev_err(&pdev->dev, "RTC supply failure\n");
- return -ENODEV;
- }
-
- device_init_wakeup(&pdev->dev, true);
-
- rtc = rtc_device_register("ab8500-rtc", &pdev->dev, &ab8500_rtc_ops,
- THIS_MODULE);
- if (IS_ERR(rtc)) {
- dev_err(&pdev->dev, "Registration failed\n");
- err = PTR_ERR(rtc);
- return err;
- }
-
- err = request_threaded_irq(irq, NULL, rtc_alarm_handler,
- IRQF_NO_SUSPEND | IRQF_ONESHOT, "ab8500-rtc", rtc);
- if (err < 0) {
- rtc_device_unregister(rtc);
- return err;
- }
-
- platform_set_drvdata(pdev, rtc);
-
-
- err = ab8500_sysfs_rtc_register(&pdev->dev);
- if (err) {
- dev_err(&pdev->dev, "sysfs RTC failed to register\n");
- return err;
- }
-
- return 0;
-}
-
-static int __devexit ab8500_rtc_remove(struct platform_device *pdev)
-{
- struct rtc_device *rtc = platform_get_drvdata(pdev);
- int irq = platform_get_irq_byname(pdev, "ALARM");
-
- ab8500_sysfs_rtc_unregister(&pdev->dev);
-
- free_irq(irq, rtc);
- rtc_device_unregister(rtc);
- platform_set_drvdata(pdev, NULL);
-
- return 0;
-}
-
-static struct platform_driver ab8500_rtc_driver = {
- .driver = {
- .name = "ab8500-rtc",
- .owner = THIS_MODULE,
- },
- .probe = ab8500_rtc_probe,
- .remove = __devexit_p(ab8500_rtc_remove),
-};
-
-module_platform_driver(ab8500_rtc_driver);
-
-MODULE_AUTHOR("Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>");
-MODULE_DESCRIPTION("AB8500 RTC Driver");
-MODULE_LICENSE("GPL v2");