rtc: add rtc-m41t80 driver
This is a new-style i2c driver for ST M41T80 series RTC chip, derived from works by Alexander Bigga <ab@mycable.de> who wrote the original rtc-m41txx.c based on drivers/i2c/chips/m41t00.c driver. This driver supports M41T8[0-4] and M41ST8[457]. The old m41t00 driver supports M41T00, M41T81 and M41T85(M41ST85). While the M41T00 chip is now supported by rtc-ds1307 driver, this driver does not include support for the chip. [akpm@linux-foundation.org: remove bogus `static'] Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Alexander Bigga <ab@mycable.de> Acked-by: Mark A. Greer <mgreer@mvista.com> Cc: David Brownell <david-b@pacbell.net> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Atsushi Nemoto
Linus Torvalds
Родитель
5663c14b4f
Коммит
caaff562e0
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@ -212,6 +212,18 @@ config RTC_DRV_PCF8583
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This driver can also be built as a module. If so, the module
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will be called rtc-pcf8583.
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config RTC_DRV_M41T80
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tristate "ST M41T80 series RTC"
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depends on RTC_CLASS && I2C
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help
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If you say Y here you will get support for the
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ST M41T80 RTC chips series. Currently following chips are
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supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85
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and M41ST87.
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This driver can also be built as a module. If so, the module
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will be called rtc-m41t80.
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comment "SPI RTC drivers"
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depends on RTC_CLASS && SPI_MASTER
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@ -29,6 +29,7 @@ obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
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obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
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obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o
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obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
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obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o
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obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
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obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
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obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
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@ -0,0 +1,629 @@
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/*
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* I2C client/driver for the ST M41T80 family of i2c rtc chips.
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*
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* Author: Alexander Bigga <ab@mycable.de>
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*
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* Based on m41t00.c by Mark A. Greer <mgreer@mvista.com>
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*
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* 2006 (c) mycable GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/i2c.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#define M41T80_REG_SSEC 0
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#define M41T80_REG_SEC 1
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#define M41T80_REG_MIN 2
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#define M41T80_REG_HOUR 3
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#define M41T80_REG_WDAY 4
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#define M41T80_REG_DAY 5
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#define M41T80_REG_MON 6
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#define M41T80_REG_YEAR 7
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#define M41T80_REG_ALARM_MON 0xa
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#define M41T80_REG_ALARM_DAY 0xb
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#define M41T80_REG_ALARM_HOUR 0xc
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#define M41T80_REG_ALARM_MIN 0xd
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#define M41T80_REG_ALARM_SEC 0xe
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#define M41T80_REG_FLAGS 0xf
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#define M41T80_REG_SQW 0x13
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#define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1)
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#define M41T80_ALARM_REG_SIZE \
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(M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON)
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#define M41T80_SEC_ST (1 << 7) /* ST: Stop Bit */
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#define M41T80_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */
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#define M41T80_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */
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#define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */
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#define M41T80_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */
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#define M41T80_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */
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#define M41T80_FEATURE_HT (1 << 0)
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#define M41T80_FEATURE_BL (1 << 1)
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#define DRV_VERSION "0.05"
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struct m41t80_chip_info {
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const char *name;
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u8 features;
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};
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static const struct m41t80_chip_info m41t80_chip_info_tbl[] = {
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{
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.name = "m41t80",
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.features = 0,
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},
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{
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.name = "m41t81",
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.features = M41T80_FEATURE_HT,
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},
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{
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.name = "m41t81s",
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.features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
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},
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{
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.name = "m41t82",
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.features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
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},
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{
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.name = "m41t83",
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.features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
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},
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{
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.name = "m41st84",
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.features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
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},
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{
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.name = "m41st85",
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.features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
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},
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{
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.name = "m41st87",
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.features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
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},
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};
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struct m41t80_data {
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const struct m41t80_chip_info *chip;
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struct rtc_device *rtc;
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};
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static int m41t80_get_datetime(struct i2c_client *client,
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struct rtc_time *tm)
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{
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u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC };
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = 1,
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.buf = dt_addr,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC,
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.buf = buf + M41T80_REG_SEC,
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},
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};
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if (i2c_transfer(client->adapter, msgs, 2) < 0) {
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dev_err(&client->dev, "read error\n");
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return -EIO;
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}
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tm->tm_sec = BCD2BIN(buf[M41T80_REG_SEC] & 0x7f);
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tm->tm_min = BCD2BIN(buf[M41T80_REG_MIN] & 0x7f);
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tm->tm_hour = BCD2BIN(buf[M41T80_REG_HOUR] & 0x3f);
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tm->tm_mday = BCD2BIN(buf[M41T80_REG_DAY] & 0x3f);
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tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07;
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tm->tm_mon = BCD2BIN(buf[M41T80_REG_MON] & 0x1f) - 1;
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/* assume 20YY not 19YY, and ignore the Century Bit */
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tm->tm_year = BCD2BIN(buf[M41T80_REG_YEAR]) + 100;
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return 0;
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}
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/* Sets the given date and time to the real time clock. */
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static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm)
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{
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u8 wbuf[1 + M41T80_DATETIME_REG_SIZE];
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u8 *buf = &wbuf[1];
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u8 dt_addr[1] = { M41T80_REG_SEC };
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struct i2c_msg msgs_in[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = 1,
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.buf = dt_addr,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC,
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.buf = buf + M41T80_REG_SEC,
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},
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};
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = 1 + M41T80_DATETIME_REG_SIZE,
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.buf = wbuf,
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},
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};
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/* Read current reg values into buf[1..7] */
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if (i2c_transfer(client->adapter, msgs_in, 2) < 0) {
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dev_err(&client->dev, "read error\n");
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return -EIO;
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}
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wbuf[0] = 0; /* offset into rtc's regs */
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/* Merge time-data and register flags into buf[0..7] */
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buf[M41T80_REG_SSEC] = 0;
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buf[M41T80_REG_SEC] =
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BIN2BCD(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f);
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buf[M41T80_REG_MIN] =
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BIN2BCD(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f);
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buf[M41T80_REG_HOUR] =
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BIN2BCD(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ;
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buf[M41T80_REG_WDAY] =
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(tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07);
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buf[M41T80_REG_DAY] =
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BIN2BCD(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f);
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buf[M41T80_REG_MON] =
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BIN2BCD(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f);
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/* assume 20YY not 19YY */
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buf[M41T80_REG_YEAR] = BIN2BCD(tm->tm_year % 100);
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if (i2c_transfer(client->adapter, msgs, 1) != 1) {
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dev_err(&client->dev, "write error\n");
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return -EIO;
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}
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return 0;
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}
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#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
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static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct m41t80_data *clientdata = i2c_get_clientdata(client);
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u8 reg;
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if (clientdata->chip->features & M41T80_FEATURE_BL) {
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reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
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seq_printf(seq, "battery\t\t: %s\n",
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(reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok");
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}
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return 0;
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}
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#else
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#define m41t80_rtc_proc NULL
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#endif
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static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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return m41t80_get_datetime(to_i2c_client(dev), tm);
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}
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static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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return m41t80_set_datetime(to_i2c_client(dev), tm);
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}
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#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
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static int
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m41t80_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int rc;
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switch (cmd) {
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case RTC_AIE_OFF:
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case RTC_AIE_ON:
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break;
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default:
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return -ENOIOCTLCMD;
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}
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rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
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if (rc < 0)
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goto err;
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switch (cmd) {
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case RTC_AIE_OFF:
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rc &= ~M41T80_ALMON_AFE;
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break;
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case RTC_AIE_ON:
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rc |= M41T80_ALMON_AFE;
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break;
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}
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if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0)
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goto err;
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return 0;
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err:
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return -EIO;
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}
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#else
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#define m41t80_rtc_ioctl NULL
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#endif
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static int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 wbuf[1 + M41T80_ALARM_REG_SIZE];
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u8 *buf = &wbuf[1];
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u8 *reg = buf - M41T80_REG_ALARM_MON;
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u8 dt_addr[1] = { M41T80_REG_ALARM_MON };
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struct i2c_msg msgs_in[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = 1,
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.buf = dt_addr,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = M41T80_ALARM_REG_SIZE,
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.buf = buf,
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},
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};
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = 1 + M41T80_ALARM_REG_SIZE,
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.buf = wbuf,
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},
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};
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if (i2c_transfer(client->adapter, msgs_in, 2) < 0) {
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dev_err(&client->dev, "read error\n");
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return -EIO;
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}
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reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE);
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reg[M41T80_REG_ALARM_DAY] = 0;
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reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80);
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reg[M41T80_REG_ALARM_MIN] = 0;
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reg[M41T80_REG_ALARM_SEC] = 0;
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wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */
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reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ?
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BIN2BCD(t->time.tm_sec) : 0x80;
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reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ?
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BIN2BCD(t->time.tm_min) : 0x80;
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reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ?
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BIN2BCD(t->time.tm_hour) : 0x80;
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reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ?
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BIN2BCD(t->time.tm_mday) : 0x80;
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if (t->time.tm_mon >= 0)
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reg[M41T80_REG_ALARM_MON] |= BIN2BCD(t->time.tm_mon + 1);
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else
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reg[M41T80_REG_ALARM_DAY] |= 0x40;
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if (i2c_transfer(client->adapter, msgs, 1) != 1) {
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dev_err(&client->dev, "write error\n");
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return -EIO;
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}
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if (t->enabled) {
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reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE;
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if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
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reg[M41T80_REG_ALARM_MON]) < 0) {
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dev_err(&client->dev, "write error\n");
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return -EIO;
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}
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}
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return 0;
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}
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static int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */
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u8 dt_addr[1] = { M41T80_REG_ALARM_MON };
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u8 *reg = buf - M41T80_REG_ALARM_MON;
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = 1,
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.buf = dt_addr,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = M41T80_ALARM_REG_SIZE + 1,
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.buf = buf,
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},
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};
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if (i2c_transfer(client->adapter, msgs, 2) < 0) {
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dev_err(&client->dev, "read error\n");
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return -EIO;
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}
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t->time.tm_sec = -1;
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t->time.tm_min = -1;
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t->time.tm_hour = -1;
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t->time.tm_mday = -1;
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t->time.tm_mon = -1;
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if (!(reg[M41T80_REG_ALARM_SEC] & 0x80))
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t->time.tm_sec = BCD2BIN(reg[M41T80_REG_ALARM_SEC] & 0x7f);
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if (!(reg[M41T80_REG_ALARM_MIN] & 0x80))
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t->time.tm_min = BCD2BIN(reg[M41T80_REG_ALARM_MIN] & 0x7f);
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if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80))
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t->time.tm_hour = BCD2BIN(reg[M41T80_REG_ALARM_HOUR] & 0x3f);
|
||||
if (!(reg[M41T80_REG_ALARM_DAY] & 0x80))
|
||||
t->time.tm_mday = BCD2BIN(reg[M41T80_REG_ALARM_DAY] & 0x3f);
|
||||
if (!(reg[M41T80_REG_ALARM_DAY] & 0x40))
|
||||
t->time.tm_mon = BCD2BIN(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1;
|
||||
t->time.tm_year = -1;
|
||||
t->time.tm_wday = -1;
|
||||
t->time.tm_yday = -1;
|
||||
t->time.tm_isdst = -1;
|
||||
t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE);
|
||||
t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct rtc_class_ops m41t80_rtc_ops = {
|
||||
.read_time = m41t80_rtc_read_time,
|
||||
.set_time = m41t80_rtc_set_time,
|
||||
.read_alarm = m41t80_rtc_read_alarm,
|
||||
.set_alarm = m41t80_rtc_set_alarm,
|
||||
.proc = m41t80_rtc_proc,
|
||||
.ioctl = m41t80_rtc_ioctl,
|
||||
};
|
||||
|
||||
#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
|
||||
static ssize_t m41t80_sysfs_show_flags(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
int val;
|
||||
|
||||
val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
|
||||
if (val < 0)
|
||||
return -EIO;
|
||||
return sprintf(buf, "%#x\n", val);
|
||||
}
|
||||
static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL);
|
||||
|
||||
static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
int val;
|
||||
|
||||
val = i2c_smbus_read_byte_data(client, M41T80_REG_SQW);
|
||||
if (val < 0)
|
||||
return -EIO;
|
||||
val = (val >> 4) & 0xf;
|
||||
switch (val) {
|
||||
case 0:
|
||||
break;
|
||||
case 1:
|
||||
val = 32768;
|
||||
break;
|
||||
default:
|
||||
val = 32768 >> val;
|
||||
}
|
||||
return sprintf(buf, "%d\n", val);
|
||||
}
|
||||
static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
int almon, sqw;
|
||||
int val = simple_strtoul(buf, NULL, 0);
|
||||
|
||||
if (val) {
|
||||
if (!is_power_of_2(val))
|
||||
return -EINVAL;
|
||||
val = ilog2(val);
|
||||
if (val == 15)
|
||||
val = 1;
|
||||
else if (val < 14)
|
||||
val = 15 - val;
|
||||
else
|
||||
return -EINVAL;
|
||||
}
|
||||
/* disable SQW, set SQW frequency & re-enable */
|
||||
almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
|
||||
if (almon < 0)
|
||||
return -EIO;
|
||||
sqw = i2c_smbus_read_byte_data(client, M41T80_REG_SQW);
|
||||
if (sqw < 0)
|
||||
return -EIO;
|
||||
sqw = (sqw & 0x0f) | (val << 4);
|
||||
if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
|
||||
almon & ~M41T80_ALMON_SQWE) < 0 ||
|
||||
i2c_smbus_write_byte_data(client, M41T80_REG_SQW, sqw) < 0)
|
||||
return -EIO;
|
||||
if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
|
||||
almon | M41T80_ALMON_SQWE) < 0)
|
||||
return -EIO;
|
||||
return count;
|
||||
}
|
||||
static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR,
|
||||
m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq);
|
||||
|
||||
static struct attribute *attrs[] = {
|
||||
&dev_attr_flags.attr,
|
||||
&dev_attr_sqwfreq.attr,
|
||||
NULL,
|
||||
};
|
||||
static struct attribute_group attr_group = {
|
||||
.attrs = attrs,
|
||||
};
|
||||
|
||||
static int m41t80_sysfs_register(struct device *dev)
|
||||
{
|
||||
return sysfs_create_group(&dev->kobj, &attr_group);
|
||||
}
|
||||
#else
|
||||
static int m41t80_sysfs_register(struct device *dev)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
*****************************************************************************
|
||||
*
|
||||
* Driver Interface
|
||||
*
|
||||
*****************************************************************************
|
||||
*/
|
||||
static int m41t80_probe(struct i2c_client *client)
|
||||
{
|
||||
int i, rc = 0;
|
||||
struct rtc_device *rtc = NULL;
|
||||
struct rtc_time tm;
|
||||
const struct m41t80_chip_info *chip;
|
||||
struct m41t80_data *clientdata = NULL;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C
|
||||
| I2C_FUNC_SMBUS_BYTE_DATA)) {
|
||||
rc = -ENODEV;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
dev_info(&client->dev,
|
||||
"chip found, driver version " DRV_VERSION "\n");
|
||||
|
||||
chip = NULL;
|
||||
for (i = 0; i < ARRAY_SIZE(m41t80_chip_info_tbl); i++) {
|
||||
if (!strcmp(m41t80_chip_info_tbl[i].name, client->name)) {
|
||||
chip = &m41t80_chip_info_tbl[i];
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!chip) {
|
||||
dev_err(&client->dev, "%s is not supported\n", client->name);
|
||||
rc = -ENODEV;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL);
|
||||
if (!clientdata) {
|
||||
rc = -ENOMEM;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
rtc = rtc_device_register(client->name, &client->dev,
|
||||
&m41t80_rtc_ops, THIS_MODULE);
|
||||
if (IS_ERR(rtc)) {
|
||||
rc = PTR_ERR(rtc);
|
||||
rtc = NULL;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
clientdata->rtc = rtc;
|
||||
clientdata->chip = chip;
|
||||
i2c_set_clientdata(client, clientdata);
|
||||
|
||||
/* Make sure HT (Halt Update) bit is cleared */
|
||||
rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR);
|
||||
if (rc < 0)
|
||||
goto ht_err;
|
||||
|
||||
if (rc & M41T80_ALHOUR_HT) {
|
||||
if (chip->features & M41T80_FEATURE_HT) {
|
||||
m41t80_get_datetime(client, &tm);
|
||||
dev_info(&client->dev, "HT bit was set!\n");
|
||||
dev_info(&client->dev,
|
||||
"Power Down at "
|
||||
"%04i-%02i-%02i %02i:%02i:%02i\n",
|
||||
tm.tm_year + 1900,
|
||||
tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
|
||||
tm.tm_min, tm.tm_sec);
|
||||
}
|
||||
if (i2c_smbus_write_byte_data(client,
|
||||
M41T80_REG_ALARM_HOUR,
|
||||
rc & ~M41T80_ALHOUR_HT) < 0)
|
||||
goto ht_err;
|
||||
}
|
||||
|
||||
/* Make sure ST (stop) bit is cleared */
|
||||
rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC);
|
||||
if (rc < 0)
|
||||
goto st_err;
|
||||
|
||||
if (rc & M41T80_SEC_ST) {
|
||||
if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC,
|
||||
rc & ~M41T80_SEC_ST) < 0)
|
||||
goto st_err;
|
||||
}
|
||||
|
||||
rc = m41t80_sysfs_register(&client->dev);
|
||||
if (rc)
|
||||
goto exit;
|
||||
|
||||
return 0;
|
||||
|
||||
st_err:
|
||||
rc = -EIO;
|
||||
dev_err(&client->dev, "Can't clear ST bit\n");
|
||||
goto exit;
|
||||
ht_err:
|
||||
rc = -EIO;
|
||||
dev_err(&client->dev, "Can't clear HT bit\n");
|
||||
goto exit;
|
||||
|
||||
exit:
|
||||
if (rtc)
|
||||
rtc_device_unregister(rtc);
|
||||
kfree(clientdata);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int m41t80_remove(struct i2c_client *client)
|
||||
{
|
||||
struct m41t80_data *clientdata = i2c_get_clientdata(client);
|
||||
struct rtc_device *rtc = clientdata->rtc;
|
||||
|
||||
if (rtc)
|
||||
rtc_device_unregister(rtc);
|
||||
kfree(clientdata);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_driver m41t80_driver = {
|
||||
.driver = {
|
||||
.name = "m41t80",
|
||||
},
|
||||
.probe = m41t80_probe,
|
||||
.remove = m41t80_remove,
|
||||
};
|
||||
|
||||
static int __init m41t80_rtc_init(void)
|
||||
{
|
||||
return i2c_add_driver(&m41t80_driver);
|
||||
}
|
||||
|
||||
static void __exit m41t80_rtc_exit(void)
|
||||
{
|
||||
i2c_del_driver(&m41t80_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Alexander Bigga <ab@mycable.de>");
|
||||
MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_VERSION(DRV_VERSION);
|
||||
|
||||
module_init(m41t80_rtc_init);
|
||||
module_exit(m41t80_rtc_exit);
|
||||
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