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Release 4.14 drivers/rtc/rtc-da9063.c

Directory: drivers/rtc
/* rtc-da9063.c - Real time clock device driver for DA9063
 * Copyright (C) 2013-2015  Dialog Semiconductor Ltd.
 *
 * 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.
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/slab.h>

#include <linux/mfd/da9062/registers.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>


#define YEARS_TO_DA9063(year)		((year) - 100)

#define MONTHS_TO_DA9063(month)		((month) + 1)

#define YEARS_FROM_DA9063(year)		((year) + 100)

#define MONTHS_FROM_DA9063(month)	((month) - 1)

enum {
	
RTC_SEC	= 0,
	
RTC_MIN	= 1,
	
RTC_HOUR = 2,
	
RTC_DAY	= 3,
	
RTC_MONTH = 4,
	
RTC_YEAR = 5,
	
RTC_DATA_LEN
};


struct da9063_compatible_rtc_regmap {
	/* REGS */
	
int rtc_enable_reg;
	
int rtc_enable_32k_crystal_reg;
	
int rtc_alarm_secs_reg;
	
int rtc_alarm_year_reg;
	
int rtc_count_secs_reg;
	
int rtc_count_year_reg;
	
int rtc_event_reg;
	/* MASKS */
	
int rtc_enable_mask;
	
int rtc_crystal_mask;
	
int rtc_event_alarm_mask;
	
int rtc_alarm_on_mask;
	
int rtc_alarm_status_mask;
	
int rtc_tick_on_mask;
	
int rtc_ready_to_read_mask;
	
int rtc_count_sec_mask;
	
int rtc_count_min_mask;
	
int rtc_count_hour_mask;
	
int rtc_count_day_mask;
	
int rtc_count_month_mask;
	
int rtc_count_year_mask;
	/* ALARM CONFIG */
	
int rtc_data_start;
	
int rtc_alarm_len;
};


struct da9063_compatible_rtc {
	
struct rtc_device *rtc_dev;
	
struct rtc_time alarm_time;
	
struct regmap *regmap;
	
const struct da9063_compatible_rtc_regmap *config;
	
bool rtc_sync;
};


static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
	/* REGS */
	.rtc_enable_reg             = DA9063_REG_CONTROL_E,
	.rtc_alarm_secs_reg         = DA9063_AD_REG_ALARM_MI,
	.rtc_alarm_year_reg         = DA9063_AD_REG_ALARM_Y,
	.rtc_count_secs_reg         = DA9063_REG_COUNT_S,
	.rtc_count_year_reg         = DA9063_REG_COUNT_Y,
	.rtc_event_reg              = DA9063_REG_EVENT_A,
	/* MASKS */
	.rtc_enable_mask            = DA9063_RTC_EN,
	.rtc_crystal_mask           = DA9063_CRYSTAL,
	.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
	.rtc_event_alarm_mask       = DA9063_E_ALARM,
	.rtc_alarm_on_mask          = DA9063_ALARM_ON,
	.rtc_alarm_status_mask      = DA9063_ALARM_STATUS_ALARM |
				      DA9063_ALARM_STATUS_TICK,
	.rtc_tick_on_mask           = DA9063_TICK_ON,
	.rtc_ready_to_read_mask     = DA9063_RTC_READ,
	.rtc_count_sec_mask         = DA9063_COUNT_SEC_MASK,
	.rtc_count_min_mask         = DA9063_COUNT_MIN_MASK,
	.rtc_count_hour_mask        = DA9063_COUNT_HOUR_MASK,
	.rtc_count_day_mask         = DA9063_COUNT_DAY_MASK,
	.rtc_count_month_mask       = DA9063_COUNT_MONTH_MASK,
	.rtc_count_year_mask        = DA9063_COUNT_YEAR_MASK,
	/* ALARM CONFIG */
	.rtc_data_start             = RTC_MIN,
	.rtc_alarm_len              = RTC_DATA_LEN - 1,
};


static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
	/* REGS */
	.rtc_enable_reg             = DA9063_REG_CONTROL_E,
	.rtc_alarm_secs_reg         = DA9063_BB_REG_ALARM_S,
	.rtc_alarm_year_reg         = DA9063_BB_REG_ALARM_Y,
	.rtc_count_secs_reg         = DA9063_REG_COUNT_S,
	.rtc_count_year_reg         = DA9063_REG_COUNT_Y,
	.rtc_event_reg              = DA9063_REG_EVENT_A,
	/* MASKS */
	.rtc_enable_mask            = DA9063_RTC_EN,
	.rtc_crystal_mask           = DA9063_CRYSTAL,
	.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
	.rtc_event_alarm_mask       = DA9063_E_ALARM,
	.rtc_alarm_on_mask          = DA9063_ALARM_ON,
	.rtc_alarm_status_mask      = DA9063_ALARM_STATUS_ALARM |
				      DA9063_ALARM_STATUS_TICK,
	.rtc_tick_on_mask           = DA9063_TICK_ON,
	.rtc_ready_to_read_mask     = DA9063_RTC_READ,
	.rtc_count_sec_mask         = DA9063_COUNT_SEC_MASK,
	.rtc_count_min_mask         = DA9063_COUNT_MIN_MASK,
	.rtc_count_hour_mask        = DA9063_COUNT_HOUR_MASK,
	.rtc_count_day_mask         = DA9063_COUNT_DAY_MASK,
	.rtc_count_month_mask       = DA9063_COUNT_MONTH_MASK,
	.rtc_count_year_mask        = DA9063_COUNT_YEAR_MASK,
	/* ALARM CONFIG */
	.rtc_data_start             = RTC_SEC,
	.rtc_alarm_len              = RTC_DATA_LEN,
};


static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
	/* REGS */
	.rtc_enable_reg             = DA9062AA_CONTROL_E,
	.rtc_alarm_secs_reg         = DA9062AA_ALARM_S,
	.rtc_alarm_year_reg         = DA9062AA_ALARM_Y,
	.rtc_count_secs_reg         = DA9062AA_COUNT_S,
	.rtc_count_year_reg         = DA9062AA_COUNT_Y,
	.rtc_event_reg              = DA9062AA_EVENT_A,
	/* MASKS */
	.rtc_enable_mask            = DA9062AA_RTC_EN_MASK,
	.rtc_crystal_mask           = DA9062AA_CRYSTAL_MASK,
	.rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
	.rtc_event_alarm_mask       = DA9062AA_M_ALARM_MASK,
	.rtc_alarm_on_mask          = DA9062AA_ALARM_ON_MASK,
	.rtc_alarm_status_mask      = (0x02 << 6),
	.rtc_tick_on_mask           = DA9062AA_TICK_ON_MASK,
	.rtc_ready_to_read_mask     = DA9062AA_RTC_READ_MASK,
	.rtc_count_sec_mask         = DA9062AA_COUNT_SEC_MASK,
	.rtc_count_min_mask         = DA9062AA_COUNT_MIN_MASK,
	.rtc_count_hour_mask        = DA9062AA_COUNT_HOUR_MASK,
	.rtc_count_day_mask         = DA9062AA_COUNT_DAY_MASK,
	.rtc_count_month_mask       = DA9062AA_COUNT_MONTH_MASK,
	.rtc_count_year_mask        = DA9062AA_COUNT_YEAR_MASK,
	/* ALARM CONFIG */
	.rtc_data_start             = RTC_SEC,
	.rtc_alarm_len              = RTC_DATA_LEN,
};


static const struct of_device_id da9063_compatible_reg_id_table[] = {
	{ .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
	{ .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
	{ },
};
MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);


static void da9063_data_to_tm(u8 *data, struct rtc_time *tm, struct da9063_compatible_rtc *rtc) { const struct da9063_compatible_rtc_regmap *config = rtc->config; tm->tm_sec = data[RTC_SEC] & config->rtc_count_sec_mask; tm->tm_min = data[RTC_MIN] & config->rtc_count_min_mask; tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask; tm->tm_mday = data[RTC_DAY] & config->rtc_count_day_mask; tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] & config->rtc_count_month_mask); tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] & config->rtc_count_year_mask); }

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static void da9063_tm_to_data(struct rtc_time *tm, u8 *data, struct da9063_compatible_rtc *rtc) { const struct da9063_compatible_rtc_regmap *config = rtc->config; data[RTC_SEC] = tm->tm_sec & config->rtc_count_sec_mask; data[RTC_MIN] = tm->tm_min & config->rtc_count_min_mask; data[RTC_HOUR] = tm->tm_hour & config->rtc_count_hour_mask; data[RTC_DAY] = tm->tm_mday & config->rtc_count_day_mask; data[RTC_MONTH] = MONTHS_TO_DA9063(tm->tm_mon) & config->rtc_count_month_mask; data[RTC_YEAR] = YEARS_TO_DA9063(tm->tm_year) & config->rtc_count_year_mask; }

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static int da9063_rtc_stop_alarm(struct device *dev) { struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev); const struct da9063_compatible_rtc_regmap *config = rtc->config; return regmap_update_bits(rtc->regmap, config->rtc_alarm_year_reg, config->rtc_alarm_on_mask, 0); }

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static int da9063_rtc_start_alarm(struct device *dev) { struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev); const struct da9063_compatible_rtc_regmap *config = rtc->config; return regmap_update_bits(rtc->regmap, config->rtc_alarm_year_reg, config->rtc_alarm_on_mask, config->rtc_alarm_on_mask); }

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static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev); const struct da9063_compatible_rtc_regmap *config = rtc->config; unsigned long tm_secs; unsigned long al_secs; u8 data[RTC_DATA_LEN]; int ret; ret = regmap_bulk_read(rtc->regmap, config->rtc_count_secs_reg, data, RTC_DATA_LEN); if (ret < 0) { dev_err(dev, "Failed to read RTC time data: %d\n", ret); return ret; } if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) { dev_dbg(dev, "RTC not yet ready to be read by the host\n"); return -EINVAL; } da9063_data_to_tm(data, tm, rtc); rtc_tm_to_time(tm, &tm_secs); rtc_tm_to_time(&rtc->alarm_time, &al_secs); /* handle the rtc synchronisation delay */ if (rtc->rtc_sync == true && al_secs - tm_secs == 1) memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time)); else rtc->rtc_sync = false; return rtc_valid_tm(tm); }

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static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev); const struct da9063_compatible_rtc_regmap *config = rtc->config; u8 data[RTC_DATA_LEN]; int ret; da9063_tm_to_data(tm, data, rtc); ret = regmap_bulk_write(rtc->regmap, config->rtc_count_secs_reg, data, RTC_DATA_LEN); if (ret < 0) dev_err(dev, "Failed to set RTC time data: %d\n", ret); return ret; }

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static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev); const struct da9063_compatible_rtc_regmap *config = rtc->config; u8 data[RTC_DATA_LEN]; int ret; unsigned int val; data[RTC_SEC] = 0; ret = regmap_bulk_read(rtc->regmap, config->rtc_alarm_secs_reg, &data[config->rtc_data_start], config->rtc_alarm_len); if (ret < 0) return ret; da9063_data_to_tm(data, &alrm->time, rtc); alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask); ret = regmap_read(rtc->regmap, config->rtc_event_reg, &val); if (ret < 0) return ret; if (val & config->rtc_event_alarm_mask) alrm->pending = 1; else alrm->pending = 0; return 0; }

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static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev); const struct da9063_compatible_rtc_regmap *config = rtc->config; u8 data[RTC_DATA_LEN]; int ret; da9063_tm_to_data(&alrm->time, data, rtc); ret = da9063_rtc_stop_alarm(dev); if (ret < 0) { dev_err(dev, "Failed to stop alarm: %d\n", ret); return ret; } ret = regmap_bulk_write(rtc->regmap, config->rtc_alarm_secs_reg, &data[config->rtc_data_start], config->rtc_alarm_len); if (ret < 0) { dev_err(dev, "Failed to write alarm: %d\n", ret); return ret; } da9063_data_to_tm(data, &rtc->alarm_time, rtc); if (alrm->enabled) { ret = da9063_rtc_start_alarm(dev); if (ret < 0) { dev_err(dev, "Failed to start alarm: %d\n", ret); return ret; } } return ret; }

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static int da9063_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { if (enabled) return da9063_rtc_start_alarm(dev); else return da9063_rtc_stop_alarm(dev); }

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static irqreturn_t da9063_alarm_event(int irq, void *data) { struct da9063_compatible_rtc *rtc = data; const struct da9063_compatible_rtc_regmap *config = rtc->config; regmap_update_bits(rtc->regmap, config->rtc_alarm_year_reg, config->rtc_alarm_on_mask, 0); rtc->rtc_sync = true; rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); return IRQ_HANDLED; }

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static const struct rtc_class_ops da9063_rtc_ops = { .read_time = da9063_rtc_read_time, .set_time = da9063_rtc_set_time, .read_alarm = da9063_rtc_read_alarm, .set_alarm = da9063_rtc_set_alarm, .alarm_irq_enable = da9063_rtc_alarm_irq_enable, };
static int da9063_rtc_probe(struct platform_device *pdev) { struct da9063_compatible_rtc *rtc; const struct da9063_compatible_rtc_regmap *config; const struct of_device_id *match; int irq_alarm; u8 data[RTC_DATA_LEN]; int ret; if (!pdev->dev.of_node) return -ENXIO; match = of_match_node(da9063_compatible_reg_id_table, pdev->dev.of_node); rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); if (!rtc) return -ENOMEM; rtc->config = match->data; if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) { struct da9063 *chip = dev_get_drvdata(pdev->dev.parent); if (chip->variant_code == PMIC_DA9063_AD) rtc->config = &da9063_ad_regs; } rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!rtc->regmap) { dev_warn(&pdev->dev, "Parent regmap unavailable.\n"); return -ENXIO; } config = rtc->config; ret = regmap_update_bits(rtc->regmap, config->rtc_enable_reg, config->rtc_enable_mask, config->rtc_enable_mask); if (ret < 0) { dev_err(&pdev->dev, "Failed to enable RTC\n"); return ret; } ret = regmap_update_bits(rtc->regmap, config->rtc_enable_32k_crystal_reg, config->rtc_crystal_mask, config->rtc_crystal_mask); if (ret < 0) { dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n"); return ret; } ret = regmap_update_bits(rtc->regmap, config->rtc_alarm_secs_reg, config->rtc_alarm_status_mask, 0); if (ret < 0) { dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); return ret; } ret = regmap_update_bits(rtc->regmap, config->rtc_alarm_secs_reg, DA9063_ALARM_STATUS_ALARM, DA9063_ALARM_STATUS_ALARM); if (ret < 0) { dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); return ret; } ret = regmap_update_bits(rtc->regmap, config->rtc_alarm_year_reg, config->rtc_tick_on_mask, 0); if (ret < 0) { dev_err(&pdev->dev, "Failed to disable TICKs\n"); return ret; } data[RTC_SEC] = 0; ret = regmap_bulk_read(rtc->regmap, config->rtc_alarm_secs_reg, &data[config->rtc_data_start], config->rtc_alarm_len); if (ret < 0) { dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n", ret); return ret; } platform_set_drvdata(pdev, rtc); rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC, &da9063_rtc_ops, THIS_MODULE); if (IS_ERR(rtc->rtc_dev)) return PTR_ERR(rtc->rtc_dev); da9063_data_to_tm(data, &rtc->alarm_time, rtc); rtc->rtc_sync = false; irq_alarm = platform_get_irq_byname(pdev, "ALARM"); ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL, da9063_alarm_event, IRQF_TRIGGER_LOW | IRQF_ONESHOT, "ALARM", rtc); if (ret) dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n", irq_alarm, ret); return ret; }

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static struct platform_driver da9063_rtc_driver = { .probe = da9063_rtc_probe, .driver = { .name = DA9063_DRVNAME_RTC, .of_match_table = da9063_compatible_reg_id_table, }, }; module_platform_driver(da9063_rtc_driver); MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);

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Directory: drivers/rtc
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