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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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+
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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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+
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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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+
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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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+
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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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+
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+#define M41T80_FEATURE_HT (1 << 0)
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+#define M41T80_FEATURE_BL (1 << 1)
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+
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+#define DRV_VERSION "0.05"
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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))
|
|
|
+ t->time.tm_min = BCD2BIN(reg[M41T80_REG_ALARM_MIN] & 0x7f);
|
|
|
+ if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80))
|
|
|
+ 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);
|