From fca1dd031a28da74db3df4921dc36fa78941c99f Mon Sep 17 00:00:00 2001 From: Jonghwa Lee Date: Thu, 21 Feb 2013 16:44:26 -0800 Subject: rtc: max77686: add Maxim 77686 driver Add a driver to support max77686 rtc. MAX77686 rtc support smpl and wtsr mode. It has two alarm register which can be used for alarming to wake system up. This drvier uses regmap to access its register. [akpm@linux-foundation.org: remove inline, __devinit annotations] [jg1.han@samsung.com: fix build warnings] [akpm@linux-foundation.org: simplify code] Signed-off-by: Chiwoong Byun Signed-off-by: Jonghwa Lee Signed-off-by: Myugnjoo Ham Signed-off-by: Kyungmin Park Signed-off-by: Jingoo Han Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/rtc/Makefile') diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index ec2988b00a44..327c430fdb9f 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -71,6 +71,7 @@ obj-$(CONFIG_RTC_DRV_MAX8907) += rtc-max8907.o obj-$(CONFIG_RTC_DRV_MAX8925) += rtc-max8925.o obj-$(CONFIG_RTC_DRV_MAX8998) += rtc-max8998.o obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o +obj-$(CONFIG_RTC_DRV_MAX77686) += rtc-max77686.o obj-$(CONFIG_RTC_DRV_MC13XXX) += rtc-mc13xxx.o obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.o obj-$(CONFIG_RTC_DRV_MPC5121) += rtc-mpc5121.o -- cgit v1.2.3 From 38ae176e01f6f9ef8159325703ef5985dee40034 Mon Sep 17 00:00:00 2001 From: "Kim, Milo" Date: Thu, 21 Feb 2013 16:44:32 -0800 Subject: rtc: add new lp8788 rtc driver TI LP8788 PMU supports regulators, battery charger, RTC, ADC, backlight driver and current sinks. This patch enables LP8788 rtc module. Signed-off-by: Milo(Woogyom) Kim Cc: "devendra.aaru" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/Kconfig | 6 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-lp8788.c | 344 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 351 insertions(+) create mode 100644 drivers/rtc/rtc-lp8788.c (limited to 'drivers/rtc/Makefile') diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 7a8dd0c2cae4..e94ae65af171 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -204,6 +204,12 @@ config RTC_DRV_DS3232 This driver can also be built as a module. If so, the module will be called rtc-ds3232. +config RTC_DRV_LP8788 + tristate "TI LP8788 RTC driver" + depends on MFD_LP8788 + help + Say Y to enable support for the LP8788 RTC/ALARM driver. + config RTC_DRV_MAX6900 tristate "Maxim MAX6900" help diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 327c430fdb9f..1a837767b68d 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -57,6 +57,7 @@ obj-$(CONFIG_RTC_DRV_IMXDI) += rtc-imxdi.o obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o obj-$(CONFIG_RTC_DRV_ISL12022) += rtc-isl12022.o obj-$(CONFIG_RTC_DRV_JZ4740) += rtc-jz4740.o +obj-$(CONFIG_RTC_DRV_LP8788) += rtc-lp8788.o obj-$(CONFIG_RTC_DRV_LPC32XX) += rtc-lpc32xx.o obj-$(CONFIG_RTC_DRV_LOONGSON1) += rtc-ls1x.o obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o diff --git a/drivers/rtc/rtc-lp8788.c b/drivers/rtc/rtc-lp8788.c new file mode 100644 index 000000000000..4a4e78e2231c --- /dev/null +++ b/drivers/rtc/rtc-lp8788.c @@ -0,0 +1,344 @@ +/* + * TI LP8788 MFD - rtc driver + * + * Copyright 2012 Texas Instruments + * + * Author: Milo(Woogyom) Kim + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include +#include + +/* register address */ +#define LP8788_INTEN_3 0x05 +#define LP8788_RTC_UNLOCK 0x64 +#define LP8788_RTC_SEC 0x70 +#define LP8788_ALM1_SEC 0x77 +#define LP8788_ALM1_EN 0x7D +#define LP8788_ALM2_SEC 0x7E +#define LP8788_ALM2_EN 0x84 + +/* mask/shift bits */ +#define LP8788_INT_RTC_ALM1_M BIT(1) /* Addr 05h */ +#define LP8788_INT_RTC_ALM1_S 1 +#define LP8788_INT_RTC_ALM2_M BIT(2) /* Addr 05h */ +#define LP8788_INT_RTC_ALM2_S 2 +#define LP8788_ALM_EN_M BIT(7) /* Addr 7Dh or 84h */ +#define LP8788_ALM_EN_S 7 + +#define DEFAULT_ALARM_SEL LP8788_ALARM_1 +#define LP8788_MONTH_OFFSET 1 +#define LP8788_BASE_YEAR 2000 +#define MAX_WDAY_BITS 7 +#define LP8788_WDAY_SET 1 +#define RTC_UNLOCK 0x1 +#define RTC_LATCH 0x2 +#define ALARM_IRQ_FLAG (RTC_IRQF | RTC_AF) + +enum lp8788_time { + LPTIME_SEC, + LPTIME_MIN, + LPTIME_HOUR, + LPTIME_MDAY, + LPTIME_MON, + LPTIME_YEAR, + LPTIME_WDAY, + LPTIME_MAX, +}; + +struct lp8788_rtc { + struct lp8788 *lp; + struct rtc_device *rdev; + enum lp8788_alarm_sel alarm; + int irq; +}; + +static const u8 addr_alarm_sec[LP8788_ALARM_MAX] = { + LP8788_ALM1_SEC, + LP8788_ALM2_SEC, +}; + +static const u8 addr_alarm_en[LP8788_ALARM_MAX] = { + LP8788_ALM1_EN, + LP8788_ALM2_EN, +}; + +static const u8 mask_alarm_en[LP8788_ALARM_MAX] = { + LP8788_INT_RTC_ALM1_M, + LP8788_INT_RTC_ALM2_M, +}; + +static const u8 shift_alarm_en[LP8788_ALARM_MAX] = { + LP8788_INT_RTC_ALM1_S, + LP8788_INT_RTC_ALM2_S, +}; + +static int _to_tm_wday(u8 lp8788_wday) +{ + int i; + + if (lp8788_wday == 0) + return 0; + + /* lookup defined weekday from read register value */ + for (i = 0; i < MAX_WDAY_BITS; i++) { + if ((lp8788_wday >> i) == LP8788_WDAY_SET) + break; + } + + return i + 1; +} + +static inline int _to_lp8788_wday(int tm_wday) +{ + return LP8788_WDAY_SET << (tm_wday - 1); +} + +static void lp8788_rtc_unlock(struct lp8788 *lp) +{ + lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_UNLOCK); + lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_LATCH); +} + +static int lp8788_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct lp8788_rtc *rtc = dev_get_drvdata(dev); + struct lp8788 *lp = rtc->lp; + u8 data[LPTIME_MAX]; + int ret; + + lp8788_rtc_unlock(lp); + + ret = lp8788_read_multi_bytes(lp, LP8788_RTC_SEC, data, LPTIME_MAX); + if (ret) + return ret; + + tm->tm_sec = data[LPTIME_SEC]; + tm->tm_min = data[LPTIME_MIN]; + tm->tm_hour = data[LPTIME_HOUR]; + tm->tm_mday = data[LPTIME_MDAY]; + tm->tm_mon = data[LPTIME_MON] - LP8788_MONTH_OFFSET; + tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900; + tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]); + + return 0; +} + +static int lp8788_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct lp8788_rtc *rtc = dev_get_drvdata(dev); + struct lp8788 *lp = rtc->lp; + u8 data[LPTIME_MAX - 1]; + int ret, i, year; + + year = tm->tm_year + 1900 - LP8788_BASE_YEAR; + if (year < 0) { + dev_err(lp->dev, "invalid year: %d\n", year); + return -EINVAL; + } + + /* because rtc weekday is a readonly register, do not update */ + data[LPTIME_SEC] = tm->tm_sec; + data[LPTIME_MIN] = tm->tm_min; + data[LPTIME_HOUR] = tm->tm_hour; + data[LPTIME_MDAY] = tm->tm_mday; + data[LPTIME_MON] = tm->tm_mon + LP8788_MONTH_OFFSET; + data[LPTIME_YEAR] = year; + + for (i = 0; i < ARRAY_SIZE(data); i++) { + ret = lp8788_write_byte(lp, LP8788_RTC_SEC + i, data[i]); + if (ret) + return ret; + } + + return 0; +} + +static int lp8788_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct lp8788_rtc *rtc = dev_get_drvdata(dev); + struct lp8788 *lp = rtc->lp; + struct rtc_time *tm = &alarm->time; + u8 addr, data[LPTIME_MAX]; + int ret; + + addr = addr_alarm_sec[rtc->alarm]; + ret = lp8788_read_multi_bytes(lp, addr, data, LPTIME_MAX); + if (ret) + return ret; + + tm->tm_sec = data[LPTIME_SEC]; + tm->tm_min = data[LPTIME_MIN]; + tm->tm_hour = data[LPTIME_HOUR]; + tm->tm_mday = data[LPTIME_MDAY]; + tm->tm_mon = data[LPTIME_MON] - LP8788_MONTH_OFFSET; + tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900; + tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]); + alarm->enabled = data[LPTIME_WDAY] & LP8788_ALM_EN_M; + + return 0; +} + +static int lp8788_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct lp8788_rtc *rtc = dev_get_drvdata(dev); + struct lp8788 *lp = rtc->lp; + struct rtc_time *tm = &alarm->time; + u8 addr, data[LPTIME_MAX]; + int ret, i, year; + + year = tm->tm_year + 1900 - LP8788_BASE_YEAR; + if (year < 0) { + dev_err(lp->dev, "invalid year: %d\n", year); + return -EINVAL; + } + + data[LPTIME_SEC] = tm->tm_sec; + data[LPTIME_MIN] = tm->tm_min; + data[LPTIME_HOUR] = tm->tm_hour; + data[LPTIME_MDAY] = tm->tm_mday; + data[LPTIME_MON] = tm->tm_mon + LP8788_MONTH_OFFSET; + data[LPTIME_YEAR] = year; + data[LPTIME_WDAY] = _to_lp8788_wday(tm->tm_wday); + + for (i = 0; i < ARRAY_SIZE(data); i++) { + addr = addr_alarm_sec[rtc->alarm] + i; + ret = lp8788_write_byte(lp, addr, data[i]); + if (ret) + return ret; + } + + alarm->enabled = 1; + addr = addr_alarm_en[rtc->alarm]; + + return lp8788_update_bits(lp, addr, LP8788_ALM_EN_M, + alarm->enabled << LP8788_ALM_EN_S); +} + +static int lp8788_alarm_irq_enable(struct device *dev, unsigned int enable) +{ + struct lp8788_rtc *rtc = dev_get_drvdata(dev); + struct lp8788 *lp = rtc->lp; + u8 mask, shift; + + if (!rtc->irq) + return -EIO; + + mask = mask_alarm_en[rtc->alarm]; + shift = shift_alarm_en[rtc->alarm]; + + return lp8788_update_bits(lp, LP8788_INTEN_3, mask, enable << shift); +} + +static const struct rtc_class_ops lp8788_rtc_ops = { + .read_time = lp8788_rtc_read_time, + .set_time = lp8788_rtc_set_time, + .read_alarm = lp8788_read_alarm, + .set_alarm = lp8788_set_alarm, + .alarm_irq_enable = lp8788_alarm_irq_enable, +}; + +static irqreturn_t lp8788_alarm_irq_handler(int irq, void *ptr) +{ + struct lp8788_rtc *rtc = ptr; + + rtc_update_irq(rtc->rdev, 1, ALARM_IRQ_FLAG); + return IRQ_HANDLED; +} + +static int lp8788_alarm_irq_register(struct platform_device *pdev, + struct lp8788_rtc *rtc) +{ + struct resource *r; + struct lp8788 *lp = rtc->lp; + struct irq_domain *irqdm = lp->irqdm; + int irq; + + rtc->irq = 0; + + /* even the alarm IRQ number is not specified, rtc time should work */ + r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, LP8788_ALM_IRQ); + if (!r) + return 0; + + if (rtc->alarm == LP8788_ALARM_1) + irq = r->start; + else + irq = r->end; + + rtc->irq = irq_create_mapping(irqdm, irq); + + return request_threaded_irq(rtc->irq, NULL, lp8788_alarm_irq_handler, + 0, LP8788_ALM_IRQ, rtc); +} + +static void lp8788_alarm_irq_unregister(struct lp8788_rtc *rtc) +{ + if (rtc->irq) + free_irq(rtc->irq, rtc); +} + +static int lp8788_rtc_probe(struct platform_device *pdev) +{ + struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); + struct lp8788_rtc *rtc; + struct device *dev = &pdev->dev; + + rtc = devm_kzalloc(dev, sizeof(struct lp8788_rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->lp = lp; + rtc->alarm = lp->pdata ? lp->pdata->alarm_sel : DEFAULT_ALARM_SEL; + platform_set_drvdata(pdev, rtc); + + device_init_wakeup(dev, 1); + + rtc->rdev = rtc_device_register("lp8788_rtc", dev, + &lp8788_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rdev)) { + dev_err(dev, "can not register rtc device\n"); + return PTR_ERR(rtc->rdev); + } + + if (lp8788_alarm_irq_register(pdev, rtc)) + dev_warn(lp->dev, "no rtc irq handler\n"); + + return 0; +} + +static int lp8788_rtc_remove(struct platform_device *pdev) +{ + struct lp8788_rtc *rtc = platform_get_drvdata(pdev); + + lp8788_alarm_irq_unregister(rtc); + rtc_device_unregister(rtc->rdev); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver lp8788_rtc_driver = { + .probe = lp8788_rtc_probe, + .remove = lp8788_rtc_remove, + .driver = { + .name = LP8788_DEV_RTC, + .owner = THIS_MODULE, + }, +}; +module_platform_driver(lp8788_rtc_driver); + +MODULE_DESCRIPTION("Texas Instruments LP8788 RTC Driver"); +MODULE_AUTHOR("Milo Kim"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:lp8788-rtc"); -- cgit v1.2.3 From 36d6182411b9f597f9f85ec0c4bb00909fd16d59 Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Thu, 21 Feb 2013 16:44:34 -0800 Subject: rtc: add RTC driver for TPS80031/TPS80032 Add an RTC driver for TPS80031/TPS80032 chips by TI. This driver supports: - Setting and getting time and date. - Setting and reading alarm time. - Alarm and interrupt functionlity. [akpm@linux-foundation.org: remove obsolete __devinit/__devexit] Signed-off-by: Laxman Dewangan Reviewed-by: Devendra Naga Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/Kconfig | 8 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-tps80031.c | 349 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 358 insertions(+) create mode 100644 drivers/rtc/rtc-tps80031.c (limited to 'drivers/rtc/Makefile') diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index e94ae65af171..d52183440691 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -396,6 +396,14 @@ config RTC_DRV_TPS65910 This driver can also be built as a module. If so, the module will be called rtc-tps65910. +config RTC_DRV_TPS80031 + tristate "TI TPS80031/TPS80032 RTC driver" + depends on MFD_TPS80031 + help + TI Power Managment IC TPS80031 supports RTC functionality + along with alarm. This driver supports the RTC driver for + the TPS80031 RTC module. + config RTC_DRV_RC5T583 tristate "RICOH 5T583 RTC driver" depends on MFD_RC5T583 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 1a837767b68d..cd03fb33c14c 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -116,6 +116,7 @@ obj-$(CONFIG_RTC_DRV_TILE) += rtc-tile.o obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o obj-$(CONFIG_RTC_DRV_TPS6586X) += rtc-tps6586x.o obj-$(CONFIG_RTC_DRV_TPS65910) += rtc-tps65910.o +obj-$(CONFIG_RTC_DRV_TPS80031) += rtc-tps80031.o obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o diff --git a/drivers/rtc/rtc-tps80031.c b/drivers/rtc/rtc-tps80031.c new file mode 100644 index 000000000000..97406411d58c --- /dev/null +++ b/drivers/rtc/rtc-tps80031.c @@ -0,0 +1,349 @@ +/* + * rtc-tps80031.c -- TI TPS80031/TPS80032 RTC driver + * + * RTC driver for TI TPS80031/TPS80032 Fully Integrated + * Power Management with Power Path and Battery Charger + * + * Copyright (c) 2012, NVIDIA Corporation. + * + * Author: Laxman Dewangan + * + * 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 version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, + * whether express or implied; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + * 02111-1307, USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ENABLE_ALARM_INT 0x08 +#define ALARM_INT_STATUS 0x40 + +/** + * Setting bit to 1 in STOP_RTC will run the RTC and + * setting this bit to 0 will freeze RTC. + */ +#define STOP_RTC 0x1 + +/* Power on reset Values of RTC registers */ +#define TPS80031_RTC_POR_YEAR 0 +#define TPS80031_RTC_POR_MONTH 1 +#define TPS80031_RTC_POR_DAY 1 + +/* Numbers of registers for time and alarms */ +#define TPS80031_RTC_TIME_NUM_REGS 7 +#define TPS80031_RTC_ALARM_NUM_REGS 6 + +/** + * PMU RTC have only 2 nibbles to store year information, so using an + * offset of 100 to set the base year as 2000 for our driver. + */ +#define RTC_YEAR_OFFSET 100 + +struct tps80031_rtc { + struct rtc_device *rtc; + int irq; +}; + +static int tps80031_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + u8 buff[TPS80031_RTC_TIME_NUM_REGS]; + int ret; + + ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_SECONDS_REG, TPS80031_RTC_TIME_NUM_REGS, buff); + if (ret < 0) { + dev_err(dev, "reading RTC_SECONDS_REG failed, err = %d\n", ret); + return ret; + } + + tm->tm_sec = bcd2bin(buff[0]); + tm->tm_min = bcd2bin(buff[1]); + tm->tm_hour = bcd2bin(buff[2]); + tm->tm_mday = bcd2bin(buff[3]); + tm->tm_mon = bcd2bin(buff[4]) - 1; + tm->tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET; + tm->tm_wday = bcd2bin(buff[6]); + return 0; +} + +static int tps80031_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + u8 buff[7]; + int ret; + + buff[0] = bin2bcd(tm->tm_sec); + buff[1] = bin2bcd(tm->tm_min); + buff[2] = bin2bcd(tm->tm_hour); + buff[3] = bin2bcd(tm->tm_mday); + buff[4] = bin2bcd(tm->tm_mon + 1); + buff[5] = bin2bcd(tm->tm_year % RTC_YEAR_OFFSET); + buff[6] = bin2bcd(tm->tm_wday); + + /* Stop RTC while updating the RTC time registers */ + ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_RTC_CTRL_REG, STOP_RTC); + if (ret < 0) { + dev_err(dev->parent, "Stop RTC failed, err = %d\n", ret); + return ret; + } + + ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_SECONDS_REG, + TPS80031_RTC_TIME_NUM_REGS, buff); + if (ret < 0) { + dev_err(dev, "writing RTC_SECONDS_REG failed, err %d\n", ret); + return ret; + } + + ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_RTC_CTRL_REG, STOP_RTC); + if (ret < 0) + dev_err(dev->parent, "Start RTC failed, err = %d\n", ret); + return ret; +} + +static int tps80031_rtc_alarm_irq_enable(struct device *dev, + unsigned int enable) +{ + int ret; + + if (enable) + ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT); + else + ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT); + if (ret < 0) { + dev_err(dev, "Update on RTC_INT failed, err = %d\n", ret); + return ret; + } + return 0; +} + +static int tps80031_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + u8 buff[TPS80031_RTC_ALARM_NUM_REGS]; + int ret; + + buff[0] = bin2bcd(alrm->time.tm_sec); + buff[1] = bin2bcd(alrm->time.tm_min); + buff[2] = bin2bcd(alrm->time.tm_hour); + buff[3] = bin2bcd(alrm->time.tm_mday); + buff[4] = bin2bcd(alrm->time.tm_mon + 1); + buff[5] = bin2bcd(alrm->time.tm_year % RTC_YEAR_OFFSET); + ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_ALARM_SECONDS_REG, + TPS80031_RTC_ALARM_NUM_REGS, buff); + if (ret < 0) { + dev_err(dev, "Writing RTC_ALARM failed, err %d\n", ret); + return ret; + } + return tps80031_rtc_alarm_irq_enable(dev, alrm->enabled); +} + +static int tps80031_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + u8 buff[6]; + int ret; + + ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_ALARM_SECONDS_REG, + TPS80031_RTC_ALARM_NUM_REGS, buff); + if (ret < 0) { + dev_err(dev->parent, + "reading RTC_ALARM failed, err = %d\n", ret); + return ret; + } + + alrm->time.tm_sec = bcd2bin(buff[0]); + alrm->time.tm_min = bcd2bin(buff[1]); + alrm->time.tm_hour = bcd2bin(buff[2]); + alrm->time.tm_mday = bcd2bin(buff[3]); + alrm->time.tm_mon = bcd2bin(buff[4]) - 1; + alrm->time.tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET; + return 0; +} + +static int clear_alarm_int_status(struct device *dev, struct tps80031_rtc *rtc) +{ + int ret; + u8 buf; + + /** + * As per datasheet, A dummy read of this RTC_STATUS_REG register + * is necessary before each I2C read in order to update the status + * register value. + */ + ret = tps80031_read(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_RTC_STATUS_REG, &buf); + if (ret < 0) { + dev_err(dev, "reading RTC_STATUS failed. err = %d\n", ret); + return ret; + } + + /* clear Alarm status bits.*/ + ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1, + TPS80031_RTC_STATUS_REG, ALARM_INT_STATUS); + if (ret < 0) { + dev_err(dev, "clear Alarm INT failed, err = %d\n", ret); + return ret; + } + return 0; +} + +static irqreturn_t tps80031_rtc_irq(int irq, void *data) +{ + struct device *dev = data; + struct tps80031_rtc *rtc = dev_get_drvdata(dev); + int ret; + + ret = clear_alarm_int_status(dev, rtc); + if (ret < 0) + return ret; + + rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); + return IRQ_HANDLED; +} + +static const struct rtc_class_ops tps80031_rtc_ops = { + .read_time = tps80031_rtc_read_time, + .set_time = tps80031_rtc_set_time, + .set_alarm = tps80031_rtc_set_alarm, + .read_alarm = tps80031_rtc_read_alarm, + .alarm_irq_enable = tps80031_rtc_alarm_irq_enable, +}; + +static int tps80031_rtc_probe(struct platform_device *pdev) +{ + struct tps80031_rtc *rtc; + struct rtc_time tm; + int ret; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->irq = platform_get_irq(pdev, 0); + platform_set_drvdata(pdev, rtc); + + /* Start RTC */ + ret = tps80031_set_bits(pdev->dev.parent, TPS80031_SLAVE_ID1, + TPS80031_RTC_CTRL_REG, STOP_RTC); + if (ret < 0) { + dev_err(&pdev->dev, "failed to start RTC. err = %d\n", ret); + return ret; + } + + /* If RTC have POR values, set time 01:01:2000 */ + tps80031_rtc_read_time(&pdev->dev, &tm); + if ((tm.tm_year == RTC_YEAR_OFFSET + TPS80031_RTC_POR_YEAR) && + (tm.tm_mon == (TPS80031_RTC_POR_MONTH - 1)) && + (tm.tm_mday == TPS80031_RTC_POR_DAY)) { + tm.tm_year = 2000; + tm.tm_mday = 1; + tm.tm_mon = 1; + ret = tps80031_rtc_set_time(&pdev->dev, &tm); + if (ret < 0) { + dev_err(&pdev->dev, + "RTC set time failed, err = %d\n", ret); + return ret; + } + } + + /* Clear alarm intretupt status if it is there */ + ret = clear_alarm_int_status(&pdev->dev, rtc); + if (ret < 0) { + dev_err(&pdev->dev, "Clear alarm int failed, err = %d\n", ret); + return ret; + } + + rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, + &tps80031_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rtc)) { + ret = PTR_ERR(rtc->rtc); + dev_err(&pdev->dev, "RTC registration failed, err %d\n", ret); + return ret; + } + + ret = request_threaded_irq(rtc->irq, NULL, tps80031_rtc_irq, + IRQF_ONESHOT | IRQF_EARLY_RESUME, + dev_name(&pdev->dev), rtc); + if (ret < 0) { + dev_err(&pdev->dev, "request IRQ:%d failed, err = %d\n", + rtc->irq, ret); + rtc_device_unregister(rtc->rtc); + return ret; + } + device_set_wakeup_capable(&pdev->dev, 1); + return 0; +} + +static int tps80031_rtc_remove(struct platform_device *pdev) +{ + struct tps80031_rtc *rtc = platform_get_drvdata(pdev); + + free_irq(rtc->irq, rtc); + rtc_device_unregister(rtc->rtc); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tps80031_rtc_suspend(struct device *dev) +{ + struct tps80031_rtc *rtc = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + enable_irq_wake(rtc->irq); + return 0; +} + +static int tps80031_rtc_resume(struct device *dev) +{ + struct tps80031_rtc *rtc = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + disable_irq_wake(rtc->irq); + return 0; +}; +#endif + +static const struct dev_pm_ops tps80031_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(tps80031_rtc_suspend, tps80031_rtc_resume) +}; + +static struct platform_driver tps80031_rtc_driver = { + .driver = { + .name = "tps80031-rtc", + .owner = THIS_MODULE, + .pm = &tps80031_pm_ops, + }, + .probe = tps80031_rtc_probe, + .remove = tps80031_rtc_remove, +}; + +module_platform_driver(tps80031_rtc_driver); + +MODULE_ALIAS("platform:tps80031-rtc"); +MODULE_DESCRIPTION("TI TPS80031/TPS80032 RTC driver"); +MODULE_AUTHOR("Laxman Dewangan "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3 From cce2da9a1fc6ef144d830587080476fec283d670 Mon Sep 17 00:00:00 2001 From: Torben Hohn Date: Thu, 21 Feb 2013 16:44:40 -0800 Subject: rtc: add support for spi rtc rx4581 [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Torben Hohn Cc: Dan Carpenter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/Kconfig | 8 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-rx4581.c | 314 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 323 insertions(+) create mode 100644 drivers/rtc/rtc-rx4581.c (limited to 'drivers/rtc/Makefile') diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index d52183440691..2e340763ba47 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -561,6 +561,14 @@ config RTC_DRV_PCF2123 This driver can also be built as a module. If so, the module will be called rtc-pcf2123. +config RTC_DRV_RX4581 + tristate "Epson RX-4581" + help + If you say yes here you will get support for the Epson RX-4581. + + This driver can also be built as a module. If so the module + will be called rtc-rx4581. + endif # SPI_MASTER comment "Platform RTC drivers" diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index cd03fb33c14c..afd284d33714 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -98,6 +98,7 @@ obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o obj-$(CONFIG_RTC_DRV_RV3029C2) += rtc-rv3029c2.o +obj-$(CONFIG_RTC_DRV_RX4581) += rtc-rx4581.o obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o obj-$(CONFIG_RTC_DRV_RX8581) += rtc-rx8581.o obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o diff --git a/drivers/rtc/rtc-rx4581.c b/drivers/rtc/rtc-rx4581.c new file mode 100644 index 000000000000..599ec73ec886 --- /dev/null +++ b/drivers/rtc/rtc-rx4581.c @@ -0,0 +1,314 @@ +/* drivers/rtc/rtc-rx4581.c + * + * written by Torben Hohn + * + * Based on: + * drivers/rtc/rtc-max6902.c + * + * Copyright (C) 2006 8D Technologies inc. + * Copyright (C) 2004 Compulab Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Driver for MAX6902 spi RTC + * + * and based on: + * drivers/rtc/rtc-rx8581.c + * + * An I2C driver for the Epson RX8581 RTC + * + * Author: Martyn Welch + * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC) + * Copyright 2005-06 Tower Technologies + * + */ + +#include +#include +#include +#include +#include +#include +#include + +#define RX4581_REG_SC 0x00 /* Second in BCD */ +#define RX4581_REG_MN 0x01 /* Minute in BCD */ +#define RX4581_REG_HR 0x02 /* Hour in BCD */ +#define RX4581_REG_DW 0x03 /* Day of Week */ +#define RX4581_REG_DM 0x04 /* Day of Month in BCD */ +#define RX4581_REG_MO 0x05 /* Month in BCD */ +#define RX4581_REG_YR 0x06 /* Year in BCD */ +#define RX4581_REG_RAM 0x07 /* RAM */ +#define RX4581_REG_AMN 0x08 /* Alarm Min in BCD*/ +#define RX4581_REG_AHR 0x09 /* Alarm Hour in BCD */ +#define RX4581_REG_ADM 0x0A +#define RX4581_REG_ADW 0x0A +#define RX4581_REG_TMR0 0x0B +#define RX4581_REG_TMR1 0x0C +#define RX4581_REG_EXT 0x0D /* Extension Register */ +#define RX4581_REG_FLAG 0x0E /* Flag Register */ +#define RX4581_REG_CTRL 0x0F /* Control Register */ + + +/* Flag Register bit definitions */ +#define RX4581_FLAG_UF 0x20 /* Update */ +#define RX4581_FLAG_TF 0x10 /* Timer */ +#define RX4581_FLAG_AF 0x08 /* Alarm */ +#define RX4581_FLAG_VLF 0x02 /* Voltage Low */ + +/* Control Register bit definitions */ +#define RX4581_CTRL_UIE 0x20 /* Update Interrupt Enable */ +#define RX4581_CTRL_TIE 0x10 /* Timer Interrupt Enable */ +#define RX4581_CTRL_AIE 0x08 /* Alarm Interrupt Enable */ +#define RX4581_CTRL_STOP 0x02 /* STOP bit */ +#define RX4581_CTRL_RESET 0x01 /* RESET bit */ + +static int rx4581_set_reg(struct device *dev, unsigned char address, + unsigned char data) +{ + struct spi_device *spi = to_spi_device(dev); + unsigned char buf[2]; + + /* high nibble must be '0' to write */ + buf[0] = address & 0x0f; + buf[1] = data; + + return spi_write_then_read(spi, buf, 2, NULL, 0); +} + +static int rx4581_get_reg(struct device *dev, unsigned char address, + unsigned char *data) +{ + struct spi_device *spi = to_spi_device(dev); + + /* Set MSB to indicate read */ + *data = address | 0x80; + + return spi_write_then_read(spi, data, 1, data, 1); +} + +/* + * In the routines that deal directly with the rx8581 hardware, we use + * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. + */ +static int rx4581_get_datetime(struct device *dev, struct rtc_time *tm) +{ + struct spi_device *spi = to_spi_device(dev); + unsigned char date[7]; + unsigned char data; + int err; + + /* First we ensure that the "update flag" is not set, we read the + * time and date then re-read the "update flag". If the update flag + * has been set, we know that the time has changed during the read so + * we repeat the whole process again. + */ + err = rx4581_get_reg(dev, RX4581_REG_FLAG, &data); + if (err != 0) { + dev_err(dev, "Unable to read device flags\n"); + return -EIO; + } + + do { + /* If update flag set, clear it */ + if (data & RX4581_FLAG_UF) { + err = rx4581_set_reg(dev, + RX4581_REG_FLAG, (data & ~RX4581_FLAG_UF)); + if (err != 0) { + dev_err(dev, "Unable to write device " + "flags\n"); + return -EIO; + } + } + + /* Now read time and date */ + date[0] = 0x80; + err = spi_write_then_read(spi, date, 1, date, 7); + if (err < 0) { + dev_err(dev, "Unable to read date\n"); + return -EIO; + } + + /* Check flag register */ + err = rx4581_get_reg(dev, RX4581_REG_FLAG, &data); + if (err != 0) { + dev_err(dev, "Unable to read device flags\n"); + return -EIO; + } + } while (data & RX4581_FLAG_UF); + + if (data & RX4581_FLAG_VLF) + dev_info(dev, + "low voltage detected, date/time is not reliable.\n"); + + dev_dbg(dev, + "%s: raw data is sec=%02x, min=%02x, hr=%02x, " + "wday=%02x, mday=%02x, mon=%02x, year=%02x\n", + __func__, + date[0], date[1], date[2], date[3], date[4], date[5], date[6]); + + tm->tm_sec = bcd2bin(date[RX4581_REG_SC] & 0x7F); + tm->tm_min = bcd2bin(date[RX4581_REG_MN] & 0x7F); + tm->tm_hour = bcd2bin(date[RX4581_REG_HR] & 0x3F); /* rtc hr 0-23 */ + tm->tm_wday = ilog2(date[RX4581_REG_DW] & 0x7F); + tm->tm_mday = bcd2bin(date[RX4581_REG_DM] & 0x3F); + tm->tm_mon = bcd2bin(date[RX4581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ + tm->tm_year = bcd2bin(date[RX4581_REG_YR]); + if (tm->tm_year < 70) + tm->tm_year += 100; /* assume we are in 1970...2069 */ + + + dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, " + "mday=%d, mon=%d, year=%d, wday=%d\n", + __func__, + tm->tm_sec, tm->tm_min, tm->tm_hour, + tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); + + err = rtc_valid_tm(tm); + if (err < 0) + dev_err(dev, "retrieved date/time is not valid.\n"); + + return err; +} + +static int rx4581_set_datetime(struct device *dev, struct rtc_time *tm) +{ + struct spi_device *spi = to_spi_device(dev); + int err; + unsigned char buf[8], data; + + dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, " + "mday=%d, mon=%d, year=%d, wday=%d\n", + __func__, + tm->tm_sec, tm->tm_min, tm->tm_hour, + tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); + + buf[0] = 0x00; + /* hours, minutes and seconds */ + buf[RX4581_REG_SC+1] = bin2bcd(tm->tm_sec); + buf[RX4581_REG_MN+1] = bin2bcd(tm->tm_min); + buf[RX4581_REG_HR+1] = bin2bcd(tm->tm_hour); + + buf[RX4581_REG_DM+1] = bin2bcd(tm->tm_mday); + + /* month, 1 - 12 */ + buf[RX4581_REG_MO+1] = bin2bcd(tm->tm_mon + 1); + + /* year and century */ + buf[RX4581_REG_YR+1] = bin2bcd(tm->tm_year % 100); + buf[RX4581_REG_DW+1] = (0x1 << tm->tm_wday); + + /* Stop the clock */ + err = rx4581_get_reg(dev, RX4581_REG_CTRL, &data); + if (err != 0) { + dev_err(dev, "Unable to read control register\n"); + return -EIO; + } + + err = rx4581_set_reg(dev, RX4581_REG_CTRL, + (data | RX4581_CTRL_STOP)); + if (err != 0) { + dev_err(dev, "Unable to write control register\n"); + return -EIO; + } + + /* write register's data */ + err = spi_write_then_read(spi, buf, 8, NULL, 0); + if (err != 0) { + dev_err(dev, "Unable to write to date registers\n"); + return -EIO; + } + + /* get VLF and clear it */ + err = rx4581_get_reg(dev, RX4581_REG_FLAG, &data); + if (err != 0) { + dev_err(dev, "Unable to read flag register\n"); + return -EIO; + } + + err = rx4581_set_reg(dev, RX4581_REG_FLAG, + (data & ~(RX4581_FLAG_VLF))); + if (err != 0) { + dev_err(dev, "Unable to write flag register\n"); + return -EIO; + } + + /* Restart the clock */ + err = rx4581_get_reg(dev, RX4581_REG_CTRL, &data); + if (err != 0) { + dev_err(dev, "Unable to read control register\n"); + return -EIO; + } + + err = rx4581_set_reg(dev, RX4581_REG_CTRL, + (data & ~(RX4581_CTRL_STOP))); + if (err != 0) { + dev_err(dev, "Unable to write control register\n"); + return -EIO; + } + + return 0; +} + +static const struct rtc_class_ops rx4581_rtc_ops = { + .read_time = rx4581_get_datetime, + .set_time = rx4581_set_datetime, +}; + +static int rx4581_probe(struct spi_device *spi) +{ + struct rtc_device *rtc; + unsigned char tmp; + int res; + + res = rx4581_get_reg(&spi->dev, RX4581_REG_SC, &tmp); + if (res != 0) + return res; + + rtc = rtc_device_register("rx4581", + &spi->dev, &rx4581_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc)) + return PTR_ERR(rtc); + + dev_set_drvdata(&spi->dev, rtc); + return 0; +} + +static int rx4581_remove(struct spi_device *spi) +{ + struct rtc_device *rtc = dev_get_drvdata(&spi->dev); + + rtc_device_unregister(rtc); + return 0; +} + +static const struct spi_device_id rx4581_id[] = { + { "rx4581", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, rx4581_id); + +static struct spi_driver rx4581_driver = { + .driver = { + .name = "rtc-rx4581", + .owner = THIS_MODULE, + }, + .probe = rx4581_probe, + .remove = rx4581_remove, + .id_table = rx4581_id, +}; + +module_spi_driver(rx4581_driver); + +MODULE_DESCRIPTION("rx4581 spi RTC driver"); +MODULE_AUTHOR("Torben Hohn"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("spi:rtc-rx4581"); -- cgit v1.2.3 From 5e0b2704a1d5c246c8282303bbc952cba17f94fc Mon Sep 17 00:00:00 2001 From: Jonghwa Lee Date: Thu, 21 Feb 2013 16:45:07 -0800 Subject: rtc: max8997: add driver for max8997 rtc Add an rtc driver for Maxim 8997 multifunction chip. Max8997 has rtc module in it. and it can be used for timekeeping clock and system alarm. It provide various operational mode those are BCD/binary, 24/12hour, am/pm. Driver sets binary/24/ for default. Maxim 8997 also supports SMPL(Sudden Momentary Power Loss), WTSR (Watchdog Timeout and Software Reset). Signed-off-by: Jonghwa Lee Cc: Devendra Naga Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/Kconfig | 10 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-max8997.c | 553 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 564 insertions(+) create mode 100644 drivers/rtc/rtc-max8997.c (limited to 'drivers/rtc/Makefile') diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 2e340763ba47..d6394c87ad6d 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -249,6 +249,16 @@ config RTC_DRV_MAX8998 This driver can also be built as a module. If so, the module will be called rtc-max8998. +config RTC_DRV_MAX8997 + tristate "Maxim MAX8997" + depends on MFD_MAX8997 + help + If you say yes here you will get support for the + RTC of Maxim MAX8997 PMIC. + + This driver can also be built as a module. If so, the module + will be called rtc-max8997. + config RTC_DRV_MAX77686 tristate "Maxim MAX77686" depends on MFD_MAX77686 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index afd284d33714..c694d2644a6c 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -71,6 +71,7 @@ obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o obj-$(CONFIG_RTC_DRV_MAX8907) += rtc-max8907.o obj-$(CONFIG_RTC_DRV_MAX8925) += rtc-max8925.o obj-$(CONFIG_RTC_DRV_MAX8998) += rtc-max8998.o +obj-$(CONFIG_RTC_DRV_MAX8997) += rtc-max8997.o obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o obj-$(CONFIG_RTC_DRV_MAX77686) += rtc-max77686.o obj-$(CONFIG_RTC_DRV_MC13XXX) += rtc-mc13xxx.o diff --git a/drivers/rtc/rtc-max8997.c b/drivers/rtc/rtc-max8997.c new file mode 100644 index 000000000000..a4e7079fb863 --- /dev/null +++ b/drivers/rtc/rtc-max8997.c @@ -0,0 +1,553 @@ +/* + * RTC driver for Maxim MAX8997 + * + * Copyright (C) 2013 Samsung Electronics Co.Ltd + * + * based on rtc-max8998.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 +#include +#include +#include +#include +#include +#include +#include + +/* Module parameter for WTSR function control */ +static int wtsr_en = 1; +module_param(wtsr_en, int, 0444); +MODULE_PARM_DESC(wtsr_en, "Wachdog Timeout & Sofware Reset (default=on)"); +/* Module parameter for SMPL function control */ +static int smpl_en = 1; +module_param(smpl_en, int, 0444); +MODULE_PARM_DESC(smpl_en, "Sudden Momentary Power Loss (default=on)"); + +/* 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) +/* WTSR and SMPL Register */ +#define WTSRT_SHIFT 0 +#define SMPLT_SHIFT 2 +#define WTSR_EN_SHIFT 6 +#define SMPL_EN_SHIFT 7 +#define WTSRT_MASK (3 << WTSRT_SHIFT) +#define SMPLT_MASK (3 << SMPLT_SHIFT) +#define WTSR_EN_MASK (1 << WTSR_EN_SHIFT) +#define SMPL_EN_MASK (1 << SMPL_EN_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) + +enum { + RTC_SEC = 0, + RTC_MIN, + RTC_HOUR, + RTC_WEEKDAY, + RTC_MONTH, + RTC_YEAR, + RTC_DATE, + RTC_NR_TIME +}; + +struct max8997_rtc_info { + struct device *dev; + struct max8997_dev *max8997; + struct i2c_client *rtc; + struct rtc_device *rtc_dev; + struct mutex lock; + int virq; + int rtc_24hr_mode; +}; + +static void max8997_rtc_data_to_tm(u8 *data, struct rtc_time *tm, + int rtc_24hr_mode) +{ + tm->tm_sec = data[RTC_SEC] & 0x7f; + tm->tm_min = data[RTC_MIN] & 0x7f; + 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; + } + + tm->tm_wday = fls(data[RTC_WEEKDAY] & 0x7f) - 1; + tm->tm_mday = data[RTC_DATE] & 0x1f; + tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1; + tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100; + tm->tm_yday = 0; + tm->tm_isdst = 0; +} + +static int max8997_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 > 100 ? (tm->tm_year - 100) : 0 ; + + if (tm->tm_year < 100) { + pr_warn("%s: MAX8997 RTC cannot handle the year %d." + "Assume it's 2000.\n", __func__, 1900 + tm->tm_year); + return -EINVAL; + } + return 0; +} + +static inline int max8997_rtc_set_update_reg(struct max8997_rtc_info *info) +{ + int ret; + + ret = max8997_write_reg(info->rtc, MAX8997_RTC_UPDATE1, + RTC_UDR_MASK); + if (ret < 0) + dev_err(info->dev, "%s: fail to write update reg(%d)\n", + __func__, ret); + else { + /* Minimum 16ms delay required before RTC update. + * Otherwise, we may read and update based on out-of-date + * value */ + msleep(20); + } + + return ret; +} + +static int max8997_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct max8997_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + int ret; + + mutex_lock(&info->lock); + ret = max8997_bulk_read(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data); + mutex_unlock(&info->lock); + + if (ret < 0) { + dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__, + ret); + return ret; + } + + max8997_rtc_data_to_tm(data, tm, info->rtc_24hr_mode); + + return rtc_valid_tm(tm); +} + +static int max8997_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct max8997_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + int ret; + + ret = max8997_rtc_tm_to_data(tm, data); + if (ret < 0) + return ret; + + mutex_lock(&info->lock); + + ret = max8997_bulk_write(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__, + ret); + goto out; + } + + ret = max8997_rtc_set_update_reg(info); +out: + mutex_unlock(&info->lock); + return ret; +} + +static int max8997_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct max8997_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + u8 val; + int i, ret; + + mutex_lock(&info->lock); + + ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME, + data); + if (ret < 0) { + dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n", + __func__, __LINE__, ret); + goto out; + } + + max8997_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode); + + alrm->enabled = 0; + for (i = 0; i < RTC_NR_TIME; i++) { + if (data[i] & ALARM_ENABLE_MASK) { + alrm->enabled = 1; + break; + } + } + + alrm->pending = 0; + ret = max8997_read_reg(info->max8997->i2c, MAX8997_REG_STATUS1, &val); + if (ret < 0) { + dev_err(info->dev, "%s:%d fail to read status1 reg(%d)\n", + __func__, __LINE__, ret); + goto out; + } + + if (val & (1 << 4)) /* RTCA1 */ + alrm->pending = 1; + +out: + mutex_unlock(&info->lock); + return 0; +} + +static int max8997_rtc_stop_alarm(struct max8997_rtc_info *info) +{ + u8 data[RTC_NR_TIME]; + int ret, i; + + if (!mutex_is_locked(&info->lock)) + dev_warn(info->dev, "%s: should have mutex locked\n", __func__); + + ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME, + data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to read alarm reg(%d)\n", + __func__, ret); + goto out; + } + + for (i = 0; i < RTC_NR_TIME; i++) + data[i] &= ~ALARM_ENABLE_MASK; + + ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME, + data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", + __func__, ret); + goto out; + } + + ret = max8997_rtc_set_update_reg(info); +out: + return ret; +} + +static int max8997_rtc_start_alarm(struct max8997_rtc_info *info) +{ + u8 data[RTC_NR_TIME]; + int ret; + + if (!mutex_is_locked(&info->lock)) + dev_warn(info->dev, "%s: should have mutex locked\n", __func__); + + ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME, + data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to read alarm reg(%d)\n", + __func__, ret); + goto out; + } + + data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT); + data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT); + data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT); + data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK; + if (data[RTC_MONTH] & 0xf) + data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT); + if (data[RTC_YEAR] & 0x7f) + data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT); + if (data[RTC_DATE] & 0x1f) + data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT); + + ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME, + data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", + __func__, ret); + goto out; + } + + ret = max8997_rtc_set_update_reg(info); +out: + return ret; +} +static int max8997_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct max8997_rtc_info *info = dev_get_drvdata(dev); + u8 data[RTC_NR_TIME]; + int ret; + + ret = max8997_rtc_tm_to_data(&alrm->time, data); + if (ret < 0) + return ret; + + dev_info(info->dev, "%s: %d-%02d-%02d %02d:%02d:%02d\n", __func__, + data[RTC_YEAR] + 2000, data[RTC_MONTH], data[RTC_DATE], + data[RTC_HOUR], data[RTC_MIN], data[RTC_SEC]); + + mutex_lock(&info->lock); + + ret = max8997_rtc_stop_alarm(info); + if (ret < 0) + goto out; + + ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME, + data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", + __func__, ret); + goto out; + } + + ret = max8997_rtc_set_update_reg(info); + if (ret < 0) + goto out; + + if (alrm->enabled) + ret = max8997_rtc_start_alarm(info); +out: + mutex_unlock(&info->lock); + return ret; +} + +static int max8997_rtc_alarm_irq_enable(struct device *dev, + unsigned int enabled) +{ + struct max8997_rtc_info *info = dev_get_drvdata(dev); + int ret; + + mutex_lock(&info->lock); + if (enabled) + ret = max8997_rtc_start_alarm(info); + else + ret = max8997_rtc_stop_alarm(info); + mutex_unlock(&info->lock); + + return ret; +} + +static irqreturn_t max8997_rtc_alarm_irq(int irq, void *data) +{ + struct max8997_rtc_info *info = data; + + dev_info(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 max8997_rtc_ops = { + .read_time = max8997_rtc_read_time, + .set_time = max8997_rtc_set_time, + .read_alarm = max8997_rtc_read_alarm, + .set_alarm = max8997_rtc_set_alarm, + .alarm_irq_enable = max8997_rtc_alarm_irq_enable, +}; + +static void max8997_rtc_enable_wtsr(struct max8997_rtc_info *info, bool enable) +{ + int ret; + u8 val, mask; + + if (!wtsr_en) + return; + + if (enable) + val = (1 << WTSR_EN_SHIFT) | (3 << WTSRT_SHIFT); + else + val = 0; + + mask = WTSR_EN_MASK | WTSRT_MASK; + + dev_info(info->dev, "%s: %s WTSR\n", __func__, + enable ? "enable" : "disable"); + + ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask); + if (ret < 0) { + dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n", + __func__, ret); + return; + } + + max8997_rtc_set_update_reg(info); +} + +static void max8997_rtc_enable_smpl(struct max8997_rtc_info *info, bool enable) +{ + int ret; + u8 val, mask; + + if (!smpl_en) + return; + + if (enable) + val = (1 << SMPL_EN_SHIFT) | (0 << SMPLT_SHIFT); + else + val = 0; + + mask = SMPL_EN_MASK | SMPLT_MASK; + + dev_info(info->dev, "%s: %s SMPL\n", __func__, + enable ? "enable" : "disable"); + + ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask); + if (ret < 0) { + dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n", + __func__, ret); + return; + } + + max8997_rtc_set_update_reg(info); + + val = 0; + max8997_read_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, &val); + pr_info("%s: WTSR_SMPL(0x%02x)\n", __func__, val); +} + +static int max8997_rtc_init_reg(struct max8997_rtc_info *info) +{ + u8 data[2]; + int ret; + + /* 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 = max8997_bulk_write(info->rtc, MAX8997_RTC_CTRLMASK, 2, data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write controlm reg(%d)\n", + __func__, ret); + return ret; + } + + ret = max8997_rtc_set_update_reg(info); + return ret; +} + +static int max8997_rtc_probe(struct platform_device *pdev) +{ + struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); + struct max8997_rtc_info *info; + int ret, virq; + + info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_rtc_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + mutex_init(&info->lock); + info->dev = &pdev->dev; + info->max8997 = max8997; + info->rtc = max8997->rtc; + + platform_set_drvdata(pdev, info); + + ret = max8997_rtc_init_reg(info); + + if (ret < 0) { + dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret); + return ret; + } + + max8997_rtc_enable_wtsr(info, true); + max8997_rtc_enable_smpl(info, true); + + device_init_wakeup(&pdev->dev, 1); + + info->rtc_dev = rtc_device_register("max8997-rtc", &pdev->dev, + &max8997_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); + return ret; + } + + virq = irq_create_mapping(max8997->irq_domain, MAX8997_PMICIRQ_RTCA1); + if (!virq) { + dev_err(&pdev->dev, "Failed to create mapping alarm IRQ\n"); + goto err_out; + } + info->virq = virq; + + ret = request_threaded_irq(virq, NULL, max8997_rtc_alarm_irq, 0, + "rtc-alarm0", info); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", + info->virq, ret); + goto err_out; + } + + return ret; + +err_out: + rtc_device_unregister(info->rtc_dev); + return ret; +} + +static int max8997_rtc_remove(struct platform_device *pdev) +{ + struct max8997_rtc_info *info = platform_get_drvdata(pdev); + + if (info) { + free_irq(info->virq, info); + rtc_device_unregister(info->rtc_dev); + } + + return 0; +} + +static void max8997_rtc_shutdown(struct platform_device *pdev) +{ + struct max8997_rtc_info *info = platform_get_drvdata(pdev); + + max8997_rtc_enable_wtsr(info, false); + max8997_rtc_enable_smpl(info, false); +} + +static const struct platform_device_id rtc_id[] = { + { "max8997-rtc", 0 }, + {}, +}; + +static struct platform_driver max8997_rtc_driver = { + .driver = { + .name = "max8997-rtc", + .owner = THIS_MODULE, + }, + .probe = max8997_rtc_probe, + .remove = max8997_rtc_remove, + .shutdown = max8997_rtc_shutdown, + .id_table = rtc_id, +}; + +module_platform_driver(max8997_rtc_driver); + +MODULE_DESCRIPTION("Maxim MAX8997 RTC driver"); +MODULE_AUTHOR(""); +MODULE_LICENSE("GPL"); -- cgit v1.2.3