[PATCH v3] rtc: add rtc-abx80x, a driver for the Abracon AB x80x i2c rtc
From: Philippe De Muyter This is a basic driver for the ultra-low-power Abracon AB x80x series of RTC chips. It supports in particular, the supersets AB0805 and AB1805. It allows reading and writing the time, and enables the supercapacitor/ battery charger. [a...@arndb.de: abx805 depends on i2c] Signed-off-by: Philippe De Muyter Cc: Alessandro Zummo Signed-off-by: Alexandre Belloni Signed-off-by: Arnd Bergmann Signed-off-by: Andrew Morton --- Changes in v3: - renamed buffer from date to buf in abx80x_rtc_read_time() drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-abx80x.c | 307 +++ 3 files changed, 318 insertions(+) create mode 100644 drivers/rtc/rtc-abx80x.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b5b5c3d485d6..89507c1858ec 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -164,6 +164,16 @@ config RTC_DRV_ABB5ZES3 This driver can also be built as a module. If so, the module will be called rtc-ab-b5ze-s3. +config RTC_DRV_ABX80X + tristate "Abracon ABx80x" + help + If you say yes here you get support for Abracon AB080X and AB180X + families of ultra-low-power battery- and capacitor-backed real-time + clock chips. + + This driver can also be built as a module. If so, the module + will be called rtc-abx80x. + config RTC_DRV_AS3722 tristate "ams AS3722 RTC driver" depends on MFD_AS3722 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 69c87062b098..7b20b0462cb6 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -25,6 +25,7 @@ obj-$(CONFIG_RTC_DRV_88PM80X) += rtc-88pm80x.o obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o +obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o obj-$(CONFIG_RTC_DRV_ARMADA38X)+= rtc-armada38x.o obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c new file mode 100644 index ..4337c3bc6ace --- /dev/null +++ b/drivers/rtc/rtc-abx80x.c @@ -0,0 +1,307 @@ +/* + * A driver for the I2C members of the Abracon AB x8xx RTC family, + * and compatible: AB 1805 and AB 0805 + * + * Copyright 2014-2015 Macq S.A. + * + * Author: Philippe De Muyter + * Author: Alexandre Belloni + * + * 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 + +#define ABX8XX_REG_HTH 0x00 +#define ABX8XX_REG_SC 0x01 +#define ABX8XX_REG_MN 0x02 +#define ABX8XX_REG_HR 0x03 +#define ABX8XX_REG_DA 0x04 +#define ABX8XX_REG_MO 0x05 +#define ABX8XX_REG_YR 0x06 +#define ABX8XX_REG_WD 0x07 + +#define ABX8XX_REG_CTRL1 0x10 +#define ABX8XX_CTRL_WRITE BIT(1) +#define ABX8XX_CTRL_12_24 BIT(6) + +#define ABX8XX_REG_CFG_KEY 0x1f +#define ABX8XX_CFG_KEY_MISC0x9d + +#define ABX8XX_REG_ID0 0x28 + +#define ABX8XX_REG_TRICKLE 0x20 +#define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0 +#define ABX8XX_TRICKLE_STANDARD_DIODE 0x8 +#define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4 + +static u8 trickle_resistors[] = {0, 3, 6, 11}; + +enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, + AB1801, AB1803, AB1804, AB1805, ABX80X}; + +struct abx80x_cap { + u16 pn; + bool has_tc; +}; + +static struct abx80x_cap abx80x_caps[] = { + [AB0801] = {.pn = 0x0801}, + [AB0803] = {.pn = 0x0803}, + [AB0804] = {.pn = 0x0804, .has_tc = true}, + [AB0805] = {.pn = 0x0805, .has_tc = true}, + [AB1801] = {.pn = 0x1801}, + [AB1803] = {.pn = 0x1803}, + [AB1804] = {.pn = 0x1804, .has_tc = true}, + [AB1805] = {.pn = 0x1805, .has_tc = true}, + [ABX80X] = {.pn = 0} +}; + +static struct i2c_driver abx80x_driver; + +static int abx80x_enable_trickle_charger(struct i2c_client *client, +u8 trickle_cfg) +{ + int err; + + /* +* Write the configuration key register to enable access to the Trickle +* register +*/ + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, + ABX8XX_CFG_KEY_MISC); + if (err < 0) { + dev_err(>dev, "Unable to write configuration key\n"); + return -EIO; + } + + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE, + ABX8XX_TRICKLE_CHARGE_ENABLE | + trickle_cfg); + if (err < 0) { + dev_err(>dev, "Unable to write trickle register\n"); + return -EIO; + } + +
[PATCH v3] rtc: add rtc-abx80x, a driver for the Abracon AB x80x i2c rtc
From: Philippe De Muyter p...@macqel.be This is a basic driver for the ultra-low-power Abracon AB x80x series of RTC chips. It supports in particular, the supersets AB0805 and AB1805. It allows reading and writing the time, and enables the supercapacitor/ battery charger. [a...@arndb.de: abx805 depends on i2c] Signed-off-by: Philippe De Muyter p...@macqel.be Cc: Alessandro Zummo a.zu...@towertech.it Signed-off-by: Alexandre Belloni alexandre.bell...@free-electrons.com Signed-off-by: Arnd Bergmann a...@arndb.de Signed-off-by: Andrew Morton a...@linux-foundation.org --- Changes in v3: - renamed buffer from date to buf in abx80x_rtc_read_time() drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-abx80x.c | 307 +++ 3 files changed, 318 insertions(+) create mode 100644 drivers/rtc/rtc-abx80x.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b5b5c3d485d6..89507c1858ec 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -164,6 +164,16 @@ config RTC_DRV_ABB5ZES3 This driver can also be built as a module. If so, the module will be called rtc-ab-b5ze-s3. +config RTC_DRV_ABX80X + tristate Abracon ABx80x + help + If you say yes here you get support for Abracon AB080X and AB180X + families of ultra-low-power battery- and capacitor-backed real-time + clock chips. + + This driver can also be built as a module. If so, the module + will be called rtc-abx80x. + config RTC_DRV_AS3722 tristate ams AS3722 RTC driver depends on MFD_AS3722 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 69c87062b098..7b20b0462cb6 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -25,6 +25,7 @@ obj-$(CONFIG_RTC_DRV_88PM80X) += rtc-88pm80x.o obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o +obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o obj-$(CONFIG_RTC_DRV_ARMADA38X)+= rtc-armada38x.o obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c new file mode 100644 index ..4337c3bc6ace --- /dev/null +++ b/drivers/rtc/rtc-abx80x.c @@ -0,0 +1,307 @@ +/* + * A driver for the I2C members of the Abracon AB x8xx RTC family, + * and compatible: AB 1805 and AB 0805 + * + * Copyright 2014-2015 Macq S.A. + * + * Author: Philippe De Muyter p...@macqel.be + * Author: Alexandre Belloni alexandre.bell...@free-electrons.com + * + * 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 linux/bcd.h +#include linux/i2c.h +#include linux/module.h +#include linux/rtc.h + +#define ABX8XX_REG_HTH 0x00 +#define ABX8XX_REG_SC 0x01 +#define ABX8XX_REG_MN 0x02 +#define ABX8XX_REG_HR 0x03 +#define ABX8XX_REG_DA 0x04 +#define ABX8XX_REG_MO 0x05 +#define ABX8XX_REG_YR 0x06 +#define ABX8XX_REG_WD 0x07 + +#define ABX8XX_REG_CTRL1 0x10 +#define ABX8XX_CTRL_WRITE BIT(1) +#define ABX8XX_CTRL_12_24 BIT(6) + +#define ABX8XX_REG_CFG_KEY 0x1f +#define ABX8XX_CFG_KEY_MISC0x9d + +#define ABX8XX_REG_ID0 0x28 + +#define ABX8XX_REG_TRICKLE 0x20 +#define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0 +#define ABX8XX_TRICKLE_STANDARD_DIODE 0x8 +#define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4 + +static u8 trickle_resistors[] = {0, 3, 6, 11}; + +enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, + AB1801, AB1803, AB1804, AB1805, ABX80X}; + +struct abx80x_cap { + u16 pn; + bool has_tc; +}; + +static struct abx80x_cap abx80x_caps[] = { + [AB0801] = {.pn = 0x0801}, + [AB0803] = {.pn = 0x0803}, + [AB0804] = {.pn = 0x0804, .has_tc = true}, + [AB0805] = {.pn = 0x0805, .has_tc = true}, + [AB1801] = {.pn = 0x1801}, + [AB1803] = {.pn = 0x1803}, + [AB1804] = {.pn = 0x1804, .has_tc = true}, + [AB1805] = {.pn = 0x1805, .has_tc = true}, + [ABX80X] = {.pn = 0} +}; + +static struct i2c_driver abx80x_driver; + +static int abx80x_enable_trickle_charger(struct i2c_client *client, +u8 trickle_cfg) +{ + int err; + + /* +* Write the configuration key register to enable access to the Trickle +* register +*/ + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, + ABX8XX_CFG_KEY_MISC); + if (err 0) { + dev_err(client-dev, Unable to write configuration key\n); + return -EIO; + } + + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE, +