diff options
Diffstat (limited to 'drivers/rtc/rtc-max77802.c')
| -rw-r--r-- | drivers/rtc/rtc-max77802.c | 502 |
1 files changed, 0 insertions, 502 deletions
diff --git a/drivers/rtc/rtc-max77802.c b/drivers/rtc/rtc-max77802.c deleted file mode 100644 index 82ffcc5a5345..000000000000 --- a/drivers/rtc/rtc-max77802.c +++ /dev/null @@ -1,502 +0,0 @@ -/* - * RTC driver for Maxim MAX77802 - * - * Copyright (C) 2013 Google, Inc - * - * Copyright (C) 2012 Samsung Electronics Co.Ltd - * - * based on rtc-max8997.c - * - * 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. - * - */ - -#include <linux/slab.h> -#include <linux/rtc.h> -#include <linux/delay.h> -#include <linux/mutex.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/mfd/max77686-private.h> -#include <linux/irqdomain.h> -#include <linux/regmap.h> - -/* RTC Control Register */ -#define BCD_EN_SHIFT 0 -#define BCD_EN_MASK (1 << BCD_EN_SHIFT) -#define MODEL24_SHIFT 1 -#define MODEL24_MASK (1 << MODEL24_SHIFT) -/* RTC Update Register1 */ -#define RTC_UDR_SHIFT 0 -#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT) -#define RTC_RBUDR_SHIFT 4 -#define RTC_RBUDR_MASK (1 << RTC_RBUDR_SHIFT) -/* RTC Hour register */ -#define HOUR_PM_SHIFT 6 -#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT) -/* RTC Alarm Enable */ -#define ALARM_ENABLE_SHIFT 7 -#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT) - -/* For the RTCAE1 register, we write this value to enable the alarm */ -#define ALARM_ENABLE_VALUE 0x77 - -#define MAX77802_RTC_UPDATE_DELAY_US 200 - -enum { - RTC_SEC = 0, - RTC_MIN, - RTC_HOUR, - RTC_WEEKDAY, - RTC_MONTH, - RTC_YEAR, - RTC_DATE, - RTC_NR_TIME -}; - -struct max77802_rtc_info { - struct device *dev; - struct max77686_dev *max77802; - struct i2c_client *rtc; - struct rtc_device *rtc_dev; - struct mutex lock; - - struct regmap *regmap; - - int virq; - int rtc_24hr_mode; -}; - -enum MAX77802_RTC_OP { - MAX77802_RTC_WRITE, - MAX77802_RTC_READ, -}; - -static void max77802_rtc_data_to_tm(u8 *data, struct rtc_time *tm, - int rtc_24hr_mode) -{ - tm->tm_sec = data[RTC_SEC] & 0xff; - tm->tm_min = data[RTC_MIN] & 0xff; - if (rtc_24hr_mode) - tm->tm_hour = data[RTC_HOUR] & 0x1f; - else { - tm->tm_hour = data[RTC_HOUR] & 0x0f; - if (data[RTC_HOUR] & HOUR_PM_MASK) - tm->tm_hour += 12; - } - - /* Only a single bit is set in data[], so fls() would be equivalent */ - tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0xff) - 1; - tm->tm_mday = data[RTC_DATE] & 0x1f; - tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1; - - tm->tm_year = data[RTC_YEAR] & 0xff; - tm->tm_yday = 0; - tm->tm_isdst = 0; -} - -static int max77802_rtc_tm_to_data(struct rtc_time *tm, u8 *data) -{ - data[RTC_SEC] = tm->tm_sec; - data[RTC_MIN] = tm->tm_min; - data[RTC_HOUR] = tm->tm_hour; - data[RTC_WEEKDAY] = 1 << tm->tm_wday; - data[RTC_DATE] = tm->tm_mday; - data[RTC_MONTH] = tm->tm_mon + 1; - data[RTC_YEAR] = tm->tm_year; - - return 0; -} - -static int max77802_rtc_update(struct max77802_rtc_info *info, - enum MAX77802_RTC_OP op) -{ - int ret; - unsigned int data; - - if (op == MAX77802_RTC_WRITE) - data = 1 << RTC_UDR_SHIFT; - else - data = 1 << RTC_RBUDR_SHIFT; - - ret = regmap_update_bits(info->max77802->regmap, - MAX77802_RTC_UPDATE0, data, data); - if (ret < 0) - dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n", - __func__, ret, data); - else { - /* Minimum delay required before RTC update. */ - usleep_range(MAX77802_RTC_UPDATE_DELAY_US, - MAX77802_RTC_UPDATE_DELAY_US * 2); - } - - return ret; -} - -static int max77802_rtc_read_time(struct device *dev, struct rtc_time *tm) -{ - struct max77802_rtc_info *info = dev_get_drvdata(dev); - u8 data[RTC_NR_TIME]; - int ret; - - mutex_lock(&info->lock); - - ret = max77802_rtc_update(info, MAX77802_RTC_READ); - if (ret < 0) - goto out; - - ret = regmap_bulk_read(info->max77802->regmap, - MAX77802_RTC_SEC, data, RTC_NR_TIME); - if (ret < 0) { - dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__, - ret); - goto out; - } - - max77802_rtc_data_to_tm(data, tm, info->rtc_24hr_mode); - - ret = rtc_valid_tm(tm); - -out: - mutex_unlock(&info->lock); - return ret; -} - -static int max77802_rtc_set_time(struct device *dev, struct rtc_time *tm) -{ - struct max77802_rtc_info *info = dev_get_drvdata(dev); - u8 data[RTC_NR_TIME]; - int ret; - - ret = max77802_rtc_tm_to_data(tm, data); - if (ret < 0) - return ret; - - mutex_lock(&info->lock); - - ret = regmap_bulk_write(info->max77802->regmap, - MAX77802_RTC_SEC, data, RTC_NR_TIME); - if (ret < 0) { - dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__, - ret); - goto out; - } - - ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); - -out: - mutex_unlock(&info->lock); - return ret; -} - -static int max77802_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct max77802_rtc_info *info = dev_get_drvdata(dev); - u8 data[RTC_NR_TIME]; - unsigned int val; - int ret; - - mutex_lock(&info->lock); - - ret = max77802_rtc_update(info, MAX77802_RTC_READ); - if (ret < 0) - goto out; - - ret = regmap_bulk_read(info->max77802->regmap, - MAX77802_ALARM1_SEC, data, RTC_NR_TIME); - if (ret < 0) { - dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n", - __func__, __LINE__, ret); - goto out; - } - - max77802_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode); - - alrm->enabled = 0; - ret = regmap_read(info->max77802->regmap, - MAX77802_RTC_AE1, &val); - if (ret < 0) { - dev_err(info->dev, "%s:%d fail to read alarm enable(%d)\n", - __func__, __LINE__, ret); - goto out; - } - if (val) - alrm->enabled = 1; - - alrm->pending = 0; - ret = regmap_read(info->max77802->regmap, MAX77802_REG_STATUS2, &val); - if (ret < 0) { - dev_err(info->dev, "%s:%d fail to read status2 reg(%d)\n", - __func__, __LINE__, ret); - goto out; - } - - if (val & (1 << 2)) /* RTCA1 */ - alrm->pending = 1; - -out: - mutex_unlock(&info->lock); - return 0; -} - -static int max77802_rtc_stop_alarm(struct max77802_rtc_info *info) -{ - int ret; - - if (!mutex_is_locked(&info->lock)) - dev_warn(info->dev, "%s: should have mutex locked\n", __func__); - - ret = max77802_rtc_update(info, MAX77802_RTC_READ); - if (ret < 0) - goto out; - - ret = regmap_write(info->max77802->regmap, - MAX77802_RTC_AE1, 0); - if (ret < 0) { - dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", - __func__, ret); - goto out; - } - - ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); -out: - return ret; -} - -static int max77802_rtc_start_alarm(struct max77802_rtc_info *info) -{ - int ret; - - if (!mutex_is_locked(&info->lock)) - dev_warn(info->dev, "%s: should have mutex locked\n", - __func__); - - ret = max77802_rtc_update(info, MAX77802_RTC_READ); - if (ret < 0) - goto out; - - ret = regmap_write(info->max77802->regmap, - MAX77802_RTC_AE1, - ALARM_ENABLE_VALUE); - - if (ret < 0) { - dev_err(info->dev, "%s: fail to read alarm reg(%d)\n", - __func__, ret); - goto out; - } - - ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); -out: - return ret; -} - -static int max77802_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct max77802_rtc_info *info = dev_get_drvdata(dev); - u8 data[RTC_NR_TIME]; - int ret; - - ret = max77802_rtc_tm_to_data(&alrm->time, data); - if (ret < 0) - return ret; - - mutex_lock(&info->lock); - - ret = max77802_rtc_stop_alarm(info); - if (ret < 0) - goto out; - - ret = regmap_bulk_write(info->max77802->regmap, - MAX77802_ALARM1_SEC, data, RTC_NR_TIME); - - if (ret < 0) { - dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", - __func__, ret); - goto out; - } - - ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); - if (ret < 0) - goto out; - - if (alrm->enabled) - ret = max77802_rtc_start_alarm(info); -out: - mutex_unlock(&info->lock); - return ret; -} - -static int max77802_rtc_alarm_irq_enable(struct device *dev, - unsigned int enabled) -{ - struct max77802_rtc_info *info = dev_get_drvdata(dev); - int ret; - - mutex_lock(&info->lock); - if (enabled) - ret = max77802_rtc_start_alarm(info); - else - ret = max77802_rtc_stop_alarm(info); - mutex_unlock(&info->lock); - - return ret; -} - -static irqreturn_t max77802_rtc_alarm_irq(int irq, void *data) -{ - struct max77802_rtc_info *info = data; - - dev_dbg(info->dev, "%s:irq(%d)\n", __func__, irq); - - rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF); - - return IRQ_HANDLED; -} - -static const struct rtc_class_ops max77802_rtc_ops = { - .read_time = max77802_rtc_read_time, - .set_time = max77802_rtc_set_time, - .read_alarm = max77802_rtc_read_alarm, - .set_alarm = max77802_rtc_set_alarm, - .alarm_irq_enable = max77802_rtc_alarm_irq_enable, -}; - -static int max77802_rtc_init_reg(struct max77802_rtc_info *info) -{ - u8 data[2]; - int ret; - - max77802_rtc_update(info, MAX77802_RTC_READ); - - /* Set RTC control register : Binary mode, 24hour mdoe */ - data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); - data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); - - info->rtc_24hr_mode = 1; - - ret = regmap_bulk_write(info->max77802->regmap, - MAX77802_RTC_CONTROLM, data, ARRAY_SIZE(data)); - if (ret < 0) { - dev_err(info->dev, "%s: fail to write controlm reg(%d)\n", - __func__, ret); - return ret; - } - - ret = max77802_rtc_update(info, MAX77802_RTC_WRITE); - return ret; -} - -static int max77802_rtc_probe(struct platform_device *pdev) -{ - struct max77686_dev *max77802 = dev_get_drvdata(pdev->dev.parent); - struct max77802_rtc_info *info; - int ret; - - dev_dbg(&pdev->dev, "%s\n", __func__); - - info = devm_kzalloc(&pdev->dev, sizeof(struct max77802_rtc_info), - GFP_KERNEL); - if (!info) - return -ENOMEM; - - mutex_init(&info->lock); - info->dev = &pdev->dev; - info->max77802 = max77802; - info->rtc = max77802->i2c; - - platform_set_drvdata(pdev, info); - - ret = max77802_rtc_init_reg(info); - - if (ret < 0) { - dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret); - return ret; - } - - device_init_wakeup(&pdev->dev, 1); - - info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77802-rtc", - &max77802_rtc_ops, THIS_MODULE); - - if (IS_ERR(info->rtc_dev)) { - ret = PTR_ERR(info->rtc_dev); - dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); - if (ret == 0) - ret = -EINVAL; - return ret; - } - - if (!max77802->rtc_irq_data) { - dev_err(&pdev->dev, "No RTC regmap IRQ chip\n"); - return -EINVAL; - } - - info->virq = regmap_irq_get_virq(max77802->rtc_irq_data, - MAX77686_RTCIRQ_RTCA1); - - if (info->virq <= 0) { - dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n", - MAX77686_RTCIRQ_RTCA1); - return -EINVAL; - } - - ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL, - max77802_rtc_alarm_irq, 0, "rtc-alarm1", - info); - if (ret < 0) - dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", - info->virq, ret); - - return ret; -} - -#ifdef CONFIG_PM_SLEEP -static int max77802_rtc_suspend(struct device *dev) -{ - if (device_may_wakeup(dev)) { - struct max77802_rtc_info *info = dev_get_drvdata(dev); - - return enable_irq_wake(info->virq); - } - - return 0; -} - -static int max77802_rtc_resume(struct device *dev) -{ - if (device_may_wakeup(dev)) { - struct max77802_rtc_info *info = dev_get_drvdata(dev); - - return disable_irq_wake(info->virq); - } - - return 0; -} -#endif - -static SIMPLE_DEV_PM_OPS(max77802_rtc_pm_ops, - max77802_rtc_suspend, max77802_rtc_resume); - -static const struct platform_device_id rtc_id[] = { - { "max77802-rtc", 0 }, - {}, -}; -MODULE_DEVICE_TABLE(platform, rtc_id); - -static struct platform_driver max77802_rtc_driver = { - .driver = { - .name = "max77802-rtc", - .pm = &max77802_rtc_pm_ops, - }, - .probe = max77802_rtc_probe, - .id_table = rtc_id, -}; - -module_platform_driver(max77802_rtc_driver); - -MODULE_DESCRIPTION("Maxim MAX77802 RTC driver"); -MODULE_AUTHOR("Simon Glass <sjg@chromium.org>"); -MODULE_LICENSE("GPL"); |