diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/rtc/rtc-ab8500.c')
-rw-r--r-- | ANDROID_3.4.5/drivers/rtc/rtc-ab8500.c | 470 |
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"); |