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333 lines
7.7 KiB
333 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Real time clock driver for DA9052 |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: Dajun Dajun Chen <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/rtc.h> |
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#include <linux/err.h> |
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#include <linux/delay.h> |
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#include <linux/mfd/da9052/da9052.h> |
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#include <linux/mfd/da9052/reg.h> |
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#define rtc_err(rtc, fmt, ...) \ |
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dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__) |
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#define DA9052_GET_TIME_RETRIES 5 |
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struct da9052_rtc { |
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struct rtc_device *rtc; |
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struct da9052 *da9052; |
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}; |
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static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable) |
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{ |
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int ret; |
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if (enable) { |
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ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG, |
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DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, |
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DA9052_ALARM_Y_ALARM_ON); |
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if (ret != 0) |
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rtc_err(rtc, "Failed to enable ALM: %d\n", ret); |
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} else { |
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ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG, |
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DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0); |
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if (ret != 0) |
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rtc_err(rtc, "Write error: %d\n", ret); |
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} |
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return ret; |
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} |
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static irqreturn_t da9052_rtc_irq(int irq, void *data) |
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{ |
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struct da9052_rtc *rtc = data; |
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rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); |
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return IRQ_HANDLED; |
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} |
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static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm) |
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{ |
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int ret; |
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uint8_t v[2][5]; |
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int idx = 1; |
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int timeout = DA9052_GET_TIME_RETRIES; |
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ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, &v[0][0]); |
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if (ret) { |
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rtc_err(rtc, "Failed to group read ALM: %d\n", ret); |
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return ret; |
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} |
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do { |
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ret = da9052_group_read(rtc->da9052, |
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DA9052_ALARM_MI_REG, 5, &v[idx][0]); |
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if (ret) { |
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rtc_err(rtc, "Failed to group read ALM: %d\n", ret); |
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return ret; |
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} |
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if (memcmp(&v[0][0], &v[1][0], 5) == 0) { |
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rtc_tm->tm_year = (v[0][4] & DA9052_RTC_YEAR) + 100; |
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rtc_tm->tm_mon = (v[0][3] & DA9052_RTC_MONTH) - 1; |
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rtc_tm->tm_mday = v[0][2] & DA9052_RTC_DAY; |
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rtc_tm->tm_hour = v[0][1] & DA9052_RTC_HOUR; |
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rtc_tm->tm_min = v[0][0] & DA9052_RTC_MIN; |
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rtc_tm->tm_sec = 0; |
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ret = rtc_valid_tm(rtc_tm); |
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return ret; |
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} |
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idx = (1-idx); |
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msleep(20); |
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} while (timeout--); |
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rtc_err(rtc, "Timed out reading alarm time\n"); |
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return -EIO; |
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} |
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static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm) |
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{ |
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struct da9052 *da9052 = rtc->da9052; |
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unsigned long alm_time; |
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int ret; |
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uint8_t v[3]; |
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alm_time = rtc_tm_to_time64(rtc_tm); |
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if (rtc_tm->tm_sec > 0) { |
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alm_time += 60 - rtc_tm->tm_sec; |
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rtc_time64_to_tm(alm_time, rtc_tm); |
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} |
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BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */ |
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rtc_tm->tm_year -= 100; |
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rtc_tm->tm_mon += 1; |
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ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG, |
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DA9052_RTC_MIN, rtc_tm->tm_min); |
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if (ret != 0) { |
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rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret); |
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return ret; |
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} |
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v[0] = rtc_tm->tm_hour; |
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v[1] = rtc_tm->tm_mday; |
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v[2] = rtc_tm->tm_mon; |
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ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v); |
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if (ret < 0) |
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return ret; |
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ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, |
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DA9052_RTC_YEAR, rtc_tm->tm_year); |
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if (ret != 0) |
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rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret); |
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return ret; |
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} |
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static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc) |
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{ |
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int ret; |
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ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG); |
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if (ret < 0) { |
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rtc_err(rtc, "Failed to read ALM: %d\n", ret); |
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return ret; |
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} |
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return !!(ret&DA9052_ALARM_Y_ALARM_ON); |
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} |
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static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) |
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{ |
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struct da9052_rtc *rtc = dev_get_drvdata(dev); |
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int ret; |
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uint8_t v[2][6]; |
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int idx = 1; |
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int timeout = DA9052_GET_TIME_RETRIES; |
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ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, &v[0][0]); |
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if (ret) { |
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rtc_err(rtc, "Failed to read RTC time : %d\n", ret); |
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return ret; |
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} |
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do { |
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ret = da9052_group_read(rtc->da9052, |
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DA9052_COUNT_S_REG, 6, &v[idx][0]); |
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if (ret) { |
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rtc_err(rtc, "Failed to read RTC time : %d\n", ret); |
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return ret; |
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} |
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if (memcmp(&v[0][0], &v[1][0], 6) == 0) { |
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rtc_tm->tm_year = (v[0][5] & DA9052_RTC_YEAR) + 100; |
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rtc_tm->tm_mon = (v[0][4] & DA9052_RTC_MONTH) - 1; |
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rtc_tm->tm_mday = v[0][3] & DA9052_RTC_DAY; |
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rtc_tm->tm_hour = v[0][2] & DA9052_RTC_HOUR; |
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rtc_tm->tm_min = v[0][1] & DA9052_RTC_MIN; |
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rtc_tm->tm_sec = v[0][0] & DA9052_RTC_SEC; |
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return 0; |
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} |
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idx = (1-idx); |
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msleep(20); |
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} while (timeout--); |
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rtc_err(rtc, "Timed out reading time\n"); |
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return -EIO; |
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} |
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static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct da9052_rtc *rtc; |
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uint8_t v[6]; |
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int ret; |
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/* DA9052 only has 6 bits for year - to represent 2000-2063 */ |
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if ((tm->tm_year < 100) || (tm->tm_year > 163)) |
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return -EINVAL; |
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rtc = dev_get_drvdata(dev); |
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v[0] = tm->tm_sec; |
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v[1] = tm->tm_min; |
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v[2] = tm->tm_hour; |
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v[3] = tm->tm_mday; |
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v[4] = tm->tm_mon + 1; |
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v[5] = tm->tm_year - 100; |
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ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v); |
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if (ret < 0) |
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rtc_err(rtc, "failed to set RTC time: %d\n", ret); |
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return ret; |
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} |
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static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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int ret; |
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struct rtc_time *tm = &alrm->time; |
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struct da9052_rtc *rtc = dev_get_drvdata(dev); |
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ret = da9052_read_alarm(rtc, tm); |
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if (ret < 0) { |
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rtc_err(rtc, "failed to read RTC alarm: %d\n", ret); |
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return ret; |
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} |
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alrm->enabled = da9052_rtc_get_alarm_status(rtc); |
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return 0; |
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} |
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static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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int ret; |
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struct rtc_time *tm = &alrm->time; |
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struct da9052_rtc *rtc = dev_get_drvdata(dev); |
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/* DA9052 only has 6 bits for year - to represent 2000-2063 */ |
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if ((tm->tm_year < 100) || (tm->tm_year > 163)) |
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return -EINVAL; |
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ret = da9052_rtc_enable_alarm(rtc, 0); |
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if (ret < 0) |
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return ret; |
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ret = da9052_set_alarm(rtc, tm); |
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if (ret < 0) |
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return ret; |
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ret = da9052_rtc_enable_alarm(rtc, 1); |
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return ret; |
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} |
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static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct da9052_rtc *rtc = dev_get_drvdata(dev); |
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return da9052_rtc_enable_alarm(rtc, enabled); |
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} |
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static const struct rtc_class_ops da9052_rtc_ops = { |
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.read_time = da9052_rtc_read_time, |
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.set_time = da9052_rtc_set_time, |
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.read_alarm = da9052_rtc_read_alarm, |
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.set_alarm = da9052_rtc_set_alarm, |
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.alarm_irq_enable = da9052_rtc_alarm_irq_enable, |
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}; |
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static int da9052_rtc_probe(struct platform_device *pdev) |
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{ |
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struct da9052_rtc *rtc; |
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int ret; |
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rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL); |
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if (!rtc) |
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return -ENOMEM; |
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rtc->da9052 = dev_get_drvdata(pdev->dev.parent); |
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platform_set_drvdata(pdev, rtc); |
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ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE); |
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if (ret < 0) { |
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rtc_err(rtc, |
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"Failed to setup RTC battery charging: %d\n", ret); |
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return ret; |
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} |
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ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG, |
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DA9052_ALARM_Y_TICK_ON, 0); |
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if (ret != 0) |
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rtc_err(rtc, "Failed to disable TICKS: %d\n", ret); |
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device_init_wakeup(&pdev->dev, true); |
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rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(rtc->rtc)) |
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return PTR_ERR(rtc->rtc); |
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rtc->rtc->ops = &da9052_rtc_ops; |
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rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
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rtc->rtc->range_max = RTC_TIMESTAMP_END_2063; |
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ret = devm_rtc_register_device(rtc->rtc); |
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if (ret) |
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return ret; |
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ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM", |
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da9052_rtc_irq, rtc); |
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if (ret != 0) { |
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rtc_err(rtc, "irq registration failed: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static struct platform_driver da9052_rtc_driver = { |
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.probe = da9052_rtc_probe, |
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.driver = { |
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.name = "da9052-rtc", |
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}, |
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}; |
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module_platform_driver(da9052_rtc_driver); |
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MODULE_AUTHOR("Anthony Olech <[email protected]>"); |
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MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:da9052-rtc");
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