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325 lines
8.6 KiB
325 lines
8.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* MOXA ART RTC driver. |
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* |
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* Copyright (C) 2013 Jonas Jensen |
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* |
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* Jonas Jensen <[email protected]> |
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* |
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* Based on code from |
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* Moxa Technology Co., Ltd. <www.moxa.com> |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/rtc.h> |
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#include <linux/platform_device.h> |
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#include <linux/module.h> |
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#include <linux/gpio.h> |
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#include <linux/of_gpio.h> |
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#define GPIO_RTC_RESERVED 0x0C |
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#define GPIO_RTC_DATA_SET 0x10 |
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#define GPIO_RTC_DATA_CLEAR 0x14 |
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#define GPIO_RTC_PIN_PULL_ENABLE 0x18 |
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#define GPIO_RTC_PIN_PULL_TYPE 0x1C |
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#define GPIO_RTC_INT_ENABLE 0x20 |
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#define GPIO_RTC_INT_RAW_STATE 0x24 |
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#define GPIO_RTC_INT_MASKED_STATE 0x28 |
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#define GPIO_RTC_INT_MASK 0x2C |
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#define GPIO_RTC_INT_CLEAR 0x30 |
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#define GPIO_RTC_INT_TRIGGER 0x34 |
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#define GPIO_RTC_INT_BOTH 0x38 |
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#define GPIO_RTC_INT_RISE_NEG 0x3C |
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#define GPIO_RTC_BOUNCE_ENABLE 0x40 |
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#define GPIO_RTC_BOUNCE_PRE_SCALE 0x44 |
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#define GPIO_RTC_PROTECT_W 0x8E |
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#define GPIO_RTC_PROTECT_R 0x8F |
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#define GPIO_RTC_YEAR_W 0x8C |
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#define GPIO_RTC_YEAR_R 0x8D |
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#define GPIO_RTC_DAY_W 0x8A |
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#define GPIO_RTC_DAY_R 0x8B |
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#define GPIO_RTC_MONTH_W 0x88 |
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#define GPIO_RTC_MONTH_R 0x89 |
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#define GPIO_RTC_DATE_W 0x86 |
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#define GPIO_RTC_DATE_R 0x87 |
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#define GPIO_RTC_HOURS_W 0x84 |
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#define GPIO_RTC_HOURS_R 0x85 |
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#define GPIO_RTC_MINUTES_W 0x82 |
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#define GPIO_RTC_MINUTES_R 0x83 |
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#define GPIO_RTC_SECONDS_W 0x80 |
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#define GPIO_RTC_SECONDS_R 0x81 |
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#define GPIO_RTC_DELAY_TIME 8 |
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struct moxart_rtc { |
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struct rtc_device *rtc; |
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spinlock_t rtc_lock; |
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int gpio_data, gpio_sclk, gpio_reset; |
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}; |
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static int day_of_year[12] = { 0, 31, 59, 90, 120, 151, 181, |
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212, 243, 273, 304, 334 }; |
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static void moxart_rtc_write_byte(struct device *dev, u8 data) |
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{ |
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev); |
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int i; |
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for (i = 0; i < 8; i++, data >>= 1) { |
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gpio_set_value(moxart_rtc->gpio_sclk, 0); |
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gpio_set_value(moxart_rtc->gpio_data, ((data & 1) == 1)); |
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udelay(GPIO_RTC_DELAY_TIME); |
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gpio_set_value(moxart_rtc->gpio_sclk, 1); |
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udelay(GPIO_RTC_DELAY_TIME); |
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} |
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} |
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static u8 moxart_rtc_read_byte(struct device *dev) |
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{ |
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev); |
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int i; |
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u8 data = 0; |
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for (i = 0; i < 8; i++) { |
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gpio_set_value(moxart_rtc->gpio_sclk, 0); |
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udelay(GPIO_RTC_DELAY_TIME); |
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gpio_set_value(moxart_rtc->gpio_sclk, 1); |
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udelay(GPIO_RTC_DELAY_TIME); |
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if (gpio_get_value(moxart_rtc->gpio_data)) |
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data |= (1 << i); |
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udelay(GPIO_RTC_DELAY_TIME); |
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} |
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return data; |
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} |
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static u8 moxart_rtc_read_register(struct device *dev, u8 cmd) |
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{ |
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev); |
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u8 data; |
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unsigned long flags; |
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local_irq_save(flags); |
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gpio_direction_output(moxart_rtc->gpio_data, 0); |
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gpio_set_value(moxart_rtc->gpio_reset, 1); |
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udelay(GPIO_RTC_DELAY_TIME); |
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moxart_rtc_write_byte(dev, cmd); |
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gpio_direction_input(moxart_rtc->gpio_data); |
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udelay(GPIO_RTC_DELAY_TIME); |
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data = moxart_rtc_read_byte(dev); |
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gpio_set_value(moxart_rtc->gpio_sclk, 0); |
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gpio_set_value(moxart_rtc->gpio_reset, 0); |
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udelay(GPIO_RTC_DELAY_TIME); |
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local_irq_restore(flags); |
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return data; |
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} |
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static void moxart_rtc_write_register(struct device *dev, u8 cmd, u8 data) |
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{ |
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev); |
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unsigned long flags; |
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local_irq_save(flags); |
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gpio_direction_output(moxart_rtc->gpio_data, 0); |
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gpio_set_value(moxart_rtc->gpio_reset, 1); |
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udelay(GPIO_RTC_DELAY_TIME); |
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moxart_rtc_write_byte(dev, cmd); |
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moxart_rtc_write_byte(dev, data); |
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gpio_set_value(moxart_rtc->gpio_sclk, 0); |
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gpio_set_value(moxart_rtc->gpio_reset, 0); |
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udelay(GPIO_RTC_DELAY_TIME); |
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local_irq_restore(flags); |
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} |
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static int moxart_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev); |
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spin_lock_irq(&moxart_rtc->rtc_lock); |
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moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0); |
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moxart_rtc_write_register(dev, GPIO_RTC_YEAR_W, |
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(((tm->tm_year - 100) / 10) << 4) | |
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((tm->tm_year - 100) % 10)); |
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moxart_rtc_write_register(dev, GPIO_RTC_MONTH_W, |
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(((tm->tm_mon + 1) / 10) << 4) | |
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((tm->tm_mon + 1) % 10)); |
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moxart_rtc_write_register(dev, GPIO_RTC_DATE_W, |
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((tm->tm_mday / 10) << 4) | |
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(tm->tm_mday % 10)); |
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moxart_rtc_write_register(dev, GPIO_RTC_HOURS_W, |
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((tm->tm_hour / 10) << 4) | |
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(tm->tm_hour % 10)); |
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moxart_rtc_write_register(dev, GPIO_RTC_MINUTES_W, |
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((tm->tm_min / 10) << 4) | |
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(tm->tm_min % 10)); |
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moxart_rtc_write_register(dev, GPIO_RTC_SECONDS_W, |
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((tm->tm_sec / 10) << 4) | |
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(tm->tm_sec % 10)); |
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moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0x80); |
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spin_unlock_irq(&moxart_rtc->rtc_lock); |
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dev_dbg(dev, "%s: success tm_year=%d tm_mon=%d\n" |
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"tm_mday=%d tm_hour=%d tm_min=%d tm_sec=%d\n", |
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__func__, tm->tm_year, tm->tm_mon, tm->tm_mday, |
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tm->tm_hour, tm->tm_min, tm->tm_sec); |
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return 0; |
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} |
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static int moxart_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev); |
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unsigned char v; |
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spin_lock_irq(&moxart_rtc->rtc_lock); |
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v = moxart_rtc_read_register(dev, GPIO_RTC_SECONDS_R); |
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tm->tm_sec = (((v & 0x70) >> 4) * 10) + (v & 0x0F); |
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v = moxart_rtc_read_register(dev, GPIO_RTC_MINUTES_R); |
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tm->tm_min = (((v & 0x70) >> 4) * 10) + (v & 0x0F); |
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v = moxart_rtc_read_register(dev, GPIO_RTC_HOURS_R); |
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if (v & 0x80) { /* 12-hour mode */ |
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tm->tm_hour = (((v & 0x10) >> 4) * 10) + (v & 0x0F); |
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if (v & 0x20) { /* PM mode */ |
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tm->tm_hour += 12; |
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if (tm->tm_hour >= 24) |
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tm->tm_hour = 0; |
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} |
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} else { /* 24-hour mode */ |
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tm->tm_hour = (((v & 0x30) >> 4) * 10) + (v & 0x0F); |
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} |
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v = moxart_rtc_read_register(dev, GPIO_RTC_DATE_R); |
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tm->tm_mday = (((v & 0x30) >> 4) * 10) + (v & 0x0F); |
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v = moxart_rtc_read_register(dev, GPIO_RTC_MONTH_R); |
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tm->tm_mon = (((v & 0x10) >> 4) * 10) + (v & 0x0F); |
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tm->tm_mon--; |
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v = moxart_rtc_read_register(dev, GPIO_RTC_YEAR_R); |
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tm->tm_year = (((v & 0xF0) >> 4) * 10) + (v & 0x0F); |
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tm->tm_year += 100; |
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if (tm->tm_year <= 69) |
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tm->tm_year += 100; |
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v = moxart_rtc_read_register(dev, GPIO_RTC_DAY_R); |
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tm->tm_wday = (v & 0x0f) - 1; |
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tm->tm_yday = day_of_year[tm->tm_mon]; |
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tm->tm_yday += (tm->tm_mday - 1); |
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if (tm->tm_mon >= 2) { |
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if (!(tm->tm_year % 4) && (tm->tm_year % 100)) |
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tm->tm_yday++; |
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} |
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tm->tm_isdst = 0; |
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spin_unlock_irq(&moxart_rtc->rtc_lock); |
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return 0; |
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} |
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static const struct rtc_class_ops moxart_rtc_ops = { |
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.read_time = moxart_rtc_read_time, |
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.set_time = moxart_rtc_set_time, |
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}; |
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static int moxart_rtc_probe(struct platform_device *pdev) |
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{ |
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struct moxart_rtc *moxart_rtc; |
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int ret = 0; |
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moxart_rtc = devm_kzalloc(&pdev->dev, sizeof(*moxart_rtc), GFP_KERNEL); |
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if (!moxart_rtc) |
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return -ENOMEM; |
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moxart_rtc->gpio_data = of_get_named_gpio(pdev->dev.of_node, |
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"gpio-rtc-data", 0); |
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if (!gpio_is_valid(moxart_rtc->gpio_data)) { |
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dev_err(&pdev->dev, "invalid gpio (data): %d\n", |
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moxart_rtc->gpio_data); |
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return moxart_rtc->gpio_data; |
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} |
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moxart_rtc->gpio_sclk = of_get_named_gpio(pdev->dev.of_node, |
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"gpio-rtc-sclk", 0); |
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if (!gpio_is_valid(moxart_rtc->gpio_sclk)) { |
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dev_err(&pdev->dev, "invalid gpio (sclk): %d\n", |
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moxart_rtc->gpio_sclk); |
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return moxart_rtc->gpio_sclk; |
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} |
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moxart_rtc->gpio_reset = of_get_named_gpio(pdev->dev.of_node, |
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"gpio-rtc-reset", 0); |
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if (!gpio_is_valid(moxart_rtc->gpio_reset)) { |
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dev_err(&pdev->dev, "invalid gpio (reset): %d\n", |
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moxart_rtc->gpio_reset); |
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return moxart_rtc->gpio_reset; |
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} |
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spin_lock_init(&moxart_rtc->rtc_lock); |
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platform_set_drvdata(pdev, moxart_rtc); |
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ret = devm_gpio_request(&pdev->dev, moxart_rtc->gpio_data, "rtc_data"); |
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if (ret) { |
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dev_err(&pdev->dev, "can't get rtc_data gpio\n"); |
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return ret; |
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} |
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ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_sclk, |
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GPIOF_DIR_OUT, "rtc_sclk"); |
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if (ret) { |
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dev_err(&pdev->dev, "can't get rtc_sclk gpio\n"); |
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return ret; |
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} |
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ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_reset, |
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GPIOF_DIR_OUT, "rtc_reset"); |
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if (ret) { |
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dev_err(&pdev->dev, "can't get rtc_reset gpio\n"); |
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return ret; |
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} |
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moxart_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
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&moxart_rtc_ops, |
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THIS_MODULE); |
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if (IS_ERR(moxart_rtc->rtc)) { |
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dev_err(&pdev->dev, "devm_rtc_device_register failed\n"); |
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return PTR_ERR(moxart_rtc->rtc); |
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} |
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return 0; |
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} |
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static const struct of_device_id moxart_rtc_match[] = { |
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{ .compatible = "moxa,moxart-rtc" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, moxart_rtc_match); |
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static struct platform_driver moxart_rtc_driver = { |
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.probe = moxart_rtc_probe, |
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.driver = { |
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.name = "moxart-rtc", |
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.of_match_table = moxart_rtc_match, |
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}, |
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}; |
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module_platform_driver(moxart_rtc_driver); |
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MODULE_DESCRIPTION("MOXART RTC driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Jonas Jensen <[email protected]>");
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