This patch adds support for the Epson RX-8025SA/NB RTC chips. It
includes support for alarms update interrupts (1 Hz) and clock
precision adjustment.
For clock precision adjustment, the SYSFS file "clock_adjust_ppb" gets
created in "/sys/class/rtc/rtcX/device". It permits to set and get the
clock adjustment in ppb (parts per billion), e.g.:
# echo -183000 > /sys/class/rtc/rtc0/device/clock_adjust_ppb
# cat /sys/class/rtc/rtc0/device/clock_adjust_ppb
-183000
This allows to compensate temperature dependent clock drifts. According
to the RX8025 SA/NB application manual the frequency and temperature
charateristics can be approximated using the following equation:
df = a * (ut - t)**2
df: Frequency deviation in any temperature
a : Coefficient = (-35 +-5) * 10**-9
ut: Ultimate temperature in degree = +25 +-5 degree
t : Any temperature in degree
Signed-off-by: Wolfgang Grandegger <w...@grandegger.com>
Signed-off-by: Sergei Poselenov <sposele...@emcraft.com>
Signed-off-by: Yuri Tikhonov <y...@emcraft.com>
Signed-off-by: Dmitry Rakhchev <r...@emcraft.com>
Signed-off-by: Matthias Fuchs <matthias.fu...@esd.eu>
---
drivers/rtc/Kconfig | 9
drivers/rtc/Makefile | 1
drivers/rtc/rtc-rx8025.c | 891 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 901 insertions(+)
create mode 100644 drivers/rtc/rtc-rx8025.c
Index: linux-2.6/drivers/rtc/Kconfig
===================================================================
--- linux-2.6.orig/drivers/rtc/Kconfig
+++ linux-2.6/drivers/rtc/Kconfig
@@ -295,6 +295,15 @@ config RTC_DRV_RX8581
This driver can also be built as a module. If so the module
will be called rtc-rx8581.
+config RTC_DRV_RX8025
+ tristate "Epson RX-8025SA/NB"
+ help
+ If you say yes here you get support for the Epson
+ RX-8025SA/NB RTC chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-rx8025.
+
endif # I2C
comment "SPI RTC drivers"
Index: linux-2.6/drivers/rtc/Makefile
===================================================================
--- linux-2.6.orig/drivers/rtc/Makefile
+++ linux-2.6/drivers/rtc/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701
obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
+obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o
obj-$(CONFIG_RTC_DRV_RX8581) += rtc-rx8581.o
obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o
obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o
Index: linux-2.6/drivers/rtc/rtc-rx8025.c
===================================================================
--- /dev/null
+++ linux-2.6/drivers/rtc/rtc-rx8025.c
@@ -0,0 +1,891 @@
+/*
+ * Driver for Epson's RTC module RX-8025 SA/NB
+ *
+ * Copyright (C) 2005 by Digi International Inc.
+ * All rights reserved.
+ *
+ * Modify by fengjh at rising.com.cn
+ * <http://lists.lm-sensors.org/mailman/listinfo/lm-sensors>
+ * 2006.11
+ *
+ * Code cleanup by Sergei Poselenov, <sposele...@emcraft.com>
+ * Converted to new style by Wolfgang Grandegger <w...@grandegger.com>
+ * Alarm and periodic interrupt added by Dmitry Rakhchev <r...@emcraft.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/kernel.h>
+#include <linux/module.h>
+#include <linux/bcd.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/rtc.h>
+#include <linux/spinlock.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/uaccess.h>
+
+/* registers */
+#define RX8025_REG_SEC 0x00
+#define RX8025_REG_MIN 0x01
+#define RX8025_REG_HOUR 0x02
+#define RX8025_REG_WDAY 0x03
+#define RX8025_REG_MDAY 0x04
+#define RX8025_REG_MONTH 0x05
+#define RX8025_REG_YEAR 0x06
+#define RX8025_REG_DIGOFF 0x07
+#define RX8025_REG_ALWMIN 0x08
+#define RX8025_REG_ALWHOUR 0x09
+#define RX8025_REG_ALWWDAY 0x0a
+#define RX8025_REG_ALDMIN 0x0b
+#define RX8025_REG_ALDHOUR 0x0c
+/* 0x0d is reserved */
+#define RX8025_REG_CTRL1 0x0e
+#define RX8025_REG_CTRL2 0x0f
+
+#define RX8025_BIT_CTRL1_CT (7 << 0)
+/* 1 Hz periodic level irq */
+#define RX8025_BIT_CTRL1_CT_1HZ 4
+#define RX8025_BIT_CTRL1_TEST (1 << 3)
+#define RX8025_BIT_CTRL1_1224 (1 << 5)
+#define RX8025_BIT_CTRL1_DALE (1 << 6)
+#define RX8025_BIT_CTRL1_WALE (1 << 7)
+
+#define RX8025_BIT_CTRL2_DAFG (1 << 0)
+#define RX8025_BIT_CTRL2_WAFG (1 << 1)
+#define RX8025_BIT_CTRL2_CTFG (1 << 2)
+#define RX8025_BIT_CTRL2_PON (1 << 4)
+#define RX8025_BIT_CTRL2_XST (1 << 5)
+#define RX8025_BIT_CTRL2_VDET (1 << 6)
+
+/* Clock precision adjustment */
+#define RX8025_ADJ_RESOLUTION 3050 /* in ppb */
+#define RX8025_ADJ_DATA_MAX 62
+#define RX8025_ADJ_DATA_MIN -62
+
+static const struct i2c_device_id rx8025_id[] = {
+ { "rx8025", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, rx8025_id);
+
+struct rx8025_data {
+ struct i2c_client *client;
+ struct rtc_device *rtc;
+ struct work_struct work;
+ struct mutex mutex;
+ u8 ctrl1;
+ int exiting;
+};
+
+static irqreturn_t rx8025_irq(int irq, void *dev_id)
+{
+ struct i2c_client *client = dev_id;
+ struct rx8025_data *rx8025 = i2c_get_clientdata(client);
+
+ disable_irq_nosync(irq);
+ schedule_work(&rx8025->work);
+ return IRQ_HANDLED;
+}
+
+static void rx8025_work(struct work_struct *work)
+{
+ struct rx8025_data *rx8025 = container_of(work,
+ struct rx8025_data, work);
+ struct i2c_client *client = rx8025->client;
+ u8 command[2] = {RX8025_REG_CTRL2 << 4 | 0x08,};
+ int ret;
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = command,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = sizeof(command) - 1,
+ .buf = command + 1,
+ }
+ };
+ u8 status;
+
+ mutex_lock(&rx8025->mutex);
+
+ ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
+ msg, ARRAY_SIZE(msg));
+ if (ret < ARRAY_SIZE(msg)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+ status = command[1];
+ if (!(status & RX8025_BIT_CTRL2_XST)) {
+ dev_warn(&client->dev, "Oscillation stop was detected,"
+ "you may have to readjust the clock\n");
+ }
+
+
+ if (status & RX8025_BIT_CTRL2_CTFG) {
+ /* periodic */
+ status &= ~RX8025_BIT_CTRL2_CTFG;
+ local_irq_disable();
+ rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
+ local_irq_enable();
+ }
+
+ if (status & RX8025_BIT_CTRL2_DAFG) {
+ /* alarm */
+ status &= RX8025_BIT_CTRL2_DAFG;
+
+ command[0] = RX8025_REG_CTRL1 << 4;
+ command[1] = rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE;
+
+
+ ret = i2c_master_send(client, command, sizeof(command));
+ if (ret < sizeof(command)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+ local_irq_disable();
+ rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
+ local_irq_enable();
+ }
+ /* acknowledge IRQ */
+ command[0] = RX8025_REG_CTRL2 << 4;
+ command[1] = status | RX8025_BIT_CTRL2_XST;
+
+ ret = i2c_master_send(client, command, sizeof(command));
+ if (ret < sizeof(command))
+ ret = ret >= 0 ? -EIO : ret;
+ else
+ ret = 0;
+
+
+out:
+ if (!rx8025->exiting)
+ enable_irq(client->irq);
+
+ mutex_unlock(&rx8025->mutex);
+}
+
+static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
+{
+ struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+ u8 command = (RX8025_REG_SEC << 4) | 0x08;
+ u8 result[7];
+ int ret;
+ struct i2c_msg msg[] = {
+ {
+ .addr = rx8025->client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = &command,
+ },
+ {
+ .addr = rx8025->client->addr,
+ .flags = I2C_M_RD,
+ .len = sizeof(result),
+ .buf = result,
+ }
+ };
+
+ ret = i2c_transfer(to_i2c_adapter(rx8025->client->dev.parent),
+ msg, ARRAY_SIZE(msg));
+ if (ret < ARRAY_SIZE(msg))
+ return ret >= 0 ? -EIO : ret;
+
+ dev_dbg(dev, "%s: read 0x%02x 0x%02x "
+ "0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__,
+ result[0], result[1], result[2], result[3], result[4],
+ result[5], result[6]);
+
+ dt->tm_sec = bcd2bin(result[RX8025_REG_SEC] & 0x7f);
+ dt->tm_min = bcd2bin(result[RX8025_REG_MIN] & 0x7f);
+ if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
+ dt->tm_hour = bcd2bin(result[RX8025_REG_HOUR] & 0x3f);
+ else
+ dt->tm_hour = bcd2bin(result[RX8025_REG_HOUR] & 0x1f) % 12
+ + (result[RX8025_REG_HOUR] & 0x20 ? 12 : 0);
+
+ dt->tm_mday = bcd2bin(result[RX8025_REG_MDAY] & 0x3f);
+ dt->tm_mon = bcd2bin(result[RX8025_REG_MONTH] & 0x1f) - 1;
+ dt->tm_year = bcd2bin(result[RX8025_REG_YEAR]);
+
+ if (dt->tm_year < 70)
+ dt->tm_year += 100;
+
+ dev_dbg(dev, "%s: result: %ds %dm %dh %dmd %dm %dy\n",
+ __func__,
+ dt->tm_sec, dt->tm_min, dt->tm_hour,
+ dt->tm_mday, dt->tm_mon, dt->tm_year);
+
+ return rtc_valid_tm(dt);
+}
+
+static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
+{
+ struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+ u8 command[8] = {RX8025_REG_SEC << 4,};
+ int ret;
+
+ /*
+ * BUG: The HW assumes every year that is a multiple of 4 to be a leap
+ * year. Next time this is wrong is 2100, which will not be a leap
+ * year.
+ */
+
+
+ /*
+ * Here the read-only bits are written as "0". I'm not sure if that
+ * is sound.
+ */
+ command[1 + RX8025_REG_SEC] = bin2bcd(dt->tm_sec);
+ command[1 + RX8025_REG_MIN] = bin2bcd(dt->tm_min);
+ if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
+ command[1 + RX8025_REG_HOUR] = bin2bcd(dt->tm_hour);
+ else
+ command[1 + RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) |
+ bin2bcd((dt->tm_hour + 11) % 12 + 1);
+
+ command[1 + RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
+ command[1 + RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
+ command[1 + RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
+ command[1 + RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100);
+
+ dev_dbg(dev, "%s: send 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x "
+ "0x%02x 0x%02x\n", __func__,
+ command[0], command[1], command[2], command[3],
+ command[4], command[5], command[6], command[7]);
+
+ ret = i2c_master_send(rx8025->client, command, sizeof(command));
+ if (ret < sizeof(command))
+ return ret >= 0 ? -EIO : ret;
+
+ return 0;
+
+}
+
+static int rx8025_init_client(struct i2c_client *client, int *need_reset)
+{
+ u8 command[3] = {RX8025_REG_CTRL1 << 4 | 0x08,};
+ int ret;
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = command,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = sizeof(command) - 1,
+ .buf = command + 1,
+ }
+ };
+ struct rx8025_data *rx8025 = i2c_get_clientdata(client);
+ int need_clear = 0;
+
+ ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
+ msg, ARRAY_SIZE(msg));
+ if (ret < ARRAY_SIZE(msg))
+ return ret >= 0 ? -EIO : ret;
+
+ /* Keep TEST bit zero ! */
+ rx8025->ctrl1 = command[1] & ~RX8025_BIT_CTRL1_TEST;
+
+ if (command[2] & RX8025_BIT_CTRL2_PON) {
+ dev_warn(&client->dev, "power-on reset was detected, "
+ "you may have to readjust the clock\n");
+ *need_reset = 1;
+ }
+
+ if (command[2] & RX8025_BIT_CTRL2_VDET) {
+ dev_warn(&client->dev, "a power voltage drop was detected, "
+ "you may have to readjust the clock\n");
+ *need_reset = 1;
+ }
+
+ if (!(command[2] & RX8025_BIT_CTRL2_XST)) {
+ dev_warn(&client->dev, "Oscillation stop was detected,"
+ "you may have to readjust the clock\n");
+ *need_reset = 1;
+ }
+
+ if (command[2] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
+ dev_warn(&client->dev, "Alarm was detected\n");
+ need_clear = 1;
+ }
+
+ if (!(command[2] & RX8025_BIT_CTRL2_CTFG))
+ need_clear = 1;
+
+ if (*need_reset || need_clear) {
+ command[1] &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET
+ | RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG
+ | RX8025_BIT_CTRL2_DAFG);
+ command[1] |= RX8025_BIT_CTRL2_XST;
+
+ command[0] = RX8025_REG_CTRL2 << 4;
+
+ ret = i2c_master_send(client, command, 2);
+ if (ret < 2)
+ return ret >= 0 ? -EIO : ret;
+ }
+
+ return 0;
+}
+
+/* Alarm support */
+static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+
+ struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+ struct i2c_client *client = rx8025->client;
+ u8 command = (RX8025_REG_ALDMIN << 4) | 0x08;
+ u8 result[2];
+ int ret;
+ u8 ctrl2;
+ u8 ctrl2_cmd = (RX8025_REG_CTRL2 << 4) | 0x08;
+ struct i2c_msg ctrl2_msg[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = &ctrl2_cmd,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = sizeof(result),
+ .buf = &ctrl2,
+ }
+ };
+ struct i2c_msg msg[] = {
+ {
+ .addr = rx8025->client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = &command,
+ },
+ {
+ .addr = rx8025->client->addr,
+ .flags = I2C_M_RD,
+ .len = sizeof(result),
+ .buf = result,
+ }
+ };
+
+ if (client->irq < 0)
+ return -EINVAL;
+
+ mutex_lock(&rx8025->mutex);
+
+ ret = i2c_transfer(to_i2c_adapter(rx8025->client->dev.parent),
+ msg, ARRAY_SIZE(msg));
+ if (ret < ARRAY_SIZE(msg)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+
+ ret = i2c_transfer(to_i2c_adapter(rx8025->client->dev.parent),
+ ctrl2_msg, ARRAY_SIZE(ctrl2_msg));
+ if (ret < ARRAY_SIZE(ctrl2_msg)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+
+ dev_dbg(dev, "%s: read 0x%02x 0x%02x ctrl2: %02x\n", __func__,
+ result[0], result[1], ctrl2);
+
+ /* Hardware alarms precision is 1 minute! */
+ t->time.tm_sec = 0;
+ t->time.tm_min = bcd2bin(result[0] & 0x7f);
+ if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
+ t->time.tm_hour = bcd2bin(result[1] & 0x3f);
+ else
+ t->time.tm_hour = bcd2bin(result[1] & 0x1f) % 12
+ + (result[1] & 0x20 ? 12 : 0);
+
+ if (t->time.tm_min >= 60)
+ t->time.tm_min = -1;
+
+ if (t->time.tm_hour >= 24)
+ t->time.tm_hour = -1;
+
+ t->time.tm_wday = -1;
+ t->time.tm_mday = -1;
+ t->time.tm_mon = -1;
+ t->time.tm_year = -1;
+
+ dev_dbg(dev, "%s: result: %ds %dm %dh %dmd %dm %dy\n",
+ __func__,
+ t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
+ t->time.tm_mday, t->time.tm_mon, t->time.tm_year);
+ t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE);
+ t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled;
+ ret = 0;
+out:
+ mutex_unlock(&rx8025->mutex);
+
+ return ret;
+}
+
+static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+ u8 command[3] = {RX8025_REG_ALDMIN << 4,};
+ int ret;
+
+ if (client->irq < 0)
+ return -EINVAL;
+
+ if ((t->time.tm_min < 0) || (t->time.tm_min >= 60))
+ return -EINVAL;
+
+ if ((t->time.tm_hour < 0) || (t->time.tm_hour >= 24))
+ return -EINVAL;
+
+ /* Hardware alarms precision is 1 minute! */
+ command[1] = bin2bcd(t->time.tm_min);
+ if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
+ command[2] = bin2bcd(t->time.tm_hour);
+ else
+ command[2] = (t->time.tm_hour >= 12 ? 0x20 : 0) |
+ bin2bcd((t->time.tm_hour + 11) % 12 + 1);
+
+ dev_dbg(dev, "%s: send 0x%02x 0x%02x 0x%02x\n", __func__,
+ command[0], command[1], command[2]);
+
+ mutex_lock(&rx8025->mutex);
+
+ if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) {
+ u8 command[2] = {RX8025_REG_CTRL1 << 4, };
+ rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
+ command[1] = rx8025->ctrl1;
+ ret = i2c_master_send(rx8025->client, command, sizeof(command));
+ if (ret < sizeof(command)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+ }
+ ret = i2c_master_send(rx8025->client, command, sizeof(command));
+ if (ret < sizeof(command)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+
+ if (t->enabled) {
+ u8 command[2] = {RX8025_REG_CTRL1 << 4, };
+ rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE;
+ command[1] = rx8025->ctrl1;
+ ret = i2c_master_send(rx8025->client, command, sizeof(command));
+ if (ret < sizeof(command)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+ }
+ ret = 0;
+out:
+ mutex_unlock(&rx8025->mutex);
+ return ret;
+}
+
+static int
+rx8025_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+ u8 command[2] = {RX8025_REG_CTRL1 << 4,};
+ u8 reg;
+ int ret = 0;
+
+ mutex_lock(&rx8025->mutex);
+
+ reg = rx8025->ctrl1;
+ switch (cmd) {
+ /* AIE = Alarm Interrupt Enable */
+ case RTC_AIE_OFF:
+ reg &= ~RX8025_BIT_CTRL1_DALE;
+ break;
+ case RTC_AIE_ON:
+ reg |= RX8025_BIT_CTRL1_DALE;
+ break;
+ default:
+ ret = -ENOIOCTLCMD;
+ }
+ if (ret == 0 && reg != rx8025->ctrl1) {
+ rx8025->ctrl1 = reg;
+ command[1] = rx8025->ctrl1;
+ ret = i2c_master_send(rx8025->client, command, sizeof(command));
+ if (ret < sizeof(command)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+ }
+out:
+ mutex_unlock(&rx8025->mutex);
+
+ return ret;
+}
+
+static int rx8025_irq_set_freq(struct device *dev, int freq)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (client->irq < 0)
+ return -ENXIO;
+
+ /* Hardware support 1Hz, 1/60Hz, 1/3600Hz and monthly
+ * interrupts, but only 1Hz fits on 2^N requirement.
+ *
+ * There's also 2Hz 50% duty pulse mode, but it is difficult
+ * to support as IRQ.
+ */
+ /* Mark, that frequency can't be changed */
+ return -ENOTTY;
+}
+
+static int rx8025_irq_set_state(struct device *dev, int enabled)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rx8025_data *rx8025 = i2c_get_clientdata(client);
+ int ret;
+ u8 reg;
+
+ if (client->irq < 0)
+ return -ENXIO;
+
+ mutex_lock(&rx8025->mutex);
+
+ reg = rx8025->ctrl1;
+ reg &= ~RX8025_BIT_CTRL1_CT;
+ if (enabled)
+ reg |= RX8025_BIT_CTRL1_CT_1HZ;
+ if (reg != rx8025->ctrl1) {
+ u8 command[2];
+
+ rx8025->ctrl1 = reg;
+ command[0] = RX8025_REG_CTRL1 << 4;
+ command[1] = rx8025->ctrl1;
+ ret = i2c_master_send(rx8025->client, command, sizeof(command));
+ if (ret < sizeof(command)) {
+ ret = ret >= 0 ? -EIO : ret;
+ goto out;
+ }
+ }
+ ret = 0;
+out:
+ mutex_unlock(&rx8025->mutex);
+
+ return ret;
+}
+
+static struct rtc_class_ops rx8025_rtc_ops = {
+ .ioctl = rx8025_ioctl,
+ .read_time = rx8025_get_time,
+ .set_time = rx8025_set_time,
+ .read_alarm = rx8025_read_alarm,
+ .set_alarm = rx8025_set_alarm,
+ .irq_set_freq = rx8025_irq_set_freq,
+ .irq_set_state = rx8025_irq_set_state,
+
+};
+
+/*
+ * Clock precision adjustment support
+ *
+ * According to the RX8025 SA/NB application manual the frequency and
+ * temperature charateristics can be approximated using the following
+ * equation:
+ *
+ * df = a * (ut - t)**2
+ *
+ * df: Frequency deviation in any temperature
+ * a : Coefficient = (-35 +-5) * 10**-9
+ * ut: Ultimate temperature in degree = +25 +-5 degree
+ * t : Any temperature in degree
+ *
+ * Note that the clock adjustment in ppb must be entered (which is
+ * the negative value of the deviation).
+ */
+static int rx8025_get_clock_adjust(struct device *dev, int *adj)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ u8 command = RX8025_REG_DIGOFF << 4 | 0x08;
+ u8 result;
+ int ret;
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = &command,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = sizeof(result),
+ .buf = &result,
+ }
+ };
+
+ ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
+ msg, ARRAY_SIZE(msg));
+ if (ret < ARRAY_SIZE(msg)) {
+ ret = ret >= 0 ? -EIO : ret;
+ return ret;
+ }
+
+ *adj = result >= 64 ? result - 128 : result;
+ if (*adj > 0)
+ (*adj)--;
+ *adj *= -RX8025_ADJ_RESOLUTION;
+
+ return 0;
+}
+
+static int rx8025_set_clock_adjust(struct device *dev, int adj)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ u8 command[2];
+ int ret;
+
+ adj /= -RX8025_ADJ_RESOLUTION;
+ if (adj > RX8025_ADJ_DATA_MAX)
+ adj = RX8025_ADJ_DATA_MAX;
+ else if (adj < RX8025_ADJ_DATA_MIN)
+ adj = RX8025_ADJ_DATA_MIN;
+ else if (adj > 0)
+ adj++;
+ else if (adj < 0)
+ adj += 128;
+
+ command[0] = RX8025_REG_DIGOFF << 4;
+ command[1] = adj;
+
+ dev_dbg(dev, "%s: send 0x%02x 0x%02x\n",
+ __func__, command[0], command[1]);
+
+ ret = i2c_master_send(client, command, sizeof(command));
+ if (ret < sizeof(command))
+ return ret >= 0 ? -EIO : ret;
+
+ return 0;
+}
+
+static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int err, adj = 0;
+
+ err = rx8025_get_clock_adjust(dev, &adj);
+ if (err)
+ return err;
+
+ return sprintf(buf, "%d\n", adj);
+}
+
+static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int adj, err;
+
+ if (sscanf(buf, "%i", &adj) != 1)
+ return -EINVAL;
+
+ err = rx8025_set_clock_adjust(dev, adj);
+
+ return err ? err : count;
+}
+
+static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR,
+ rx8025_sysfs_show_clock_adjust,
+ rx8025_sysfs_store_clock_adjust);
+
+static int rx8025_sysfs_register(struct device *dev)
+{
+ return device_create_file(dev, &dev_attr_clock_adjust_ppb);
+}
+
+static void rx8025_sysfs_unregister(struct device *dev)
+{
+ device_remove_file(dev, &dev_attr_clock_adjust_ppb);
+}
+
+static int __devinit rx8025_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct rx8025_data *rx8025;
+ int i, err, need_reset = 0;
+ u8 command = 0x08;
+ u8 result[RX8025_REG_YEAR + 1];
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = &command,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = sizeof(result),
+ .buf = result,
+ }
+ };
+ u8 zero_mask[] = {
+ 0x80, /* seconds */
+ 0x80, /* minutes */
+ 0xC0, /* hours */
+ 0xF8, /* days */
+ 0xC0, /* days */
+ 0x60, /* months */
+ 0x00, /* years */
+ };
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
+ dev_err(&adapter->dev, "doesn't support full I2C\n");
+ err = -EIO;
+ goto errout;
+ }
+
+ rx8025 = kzalloc(sizeof(*rx8025), GFP_KERNEL);
+ if (!rx8025) {
+ dev_err(&adapter->dev, "failed to alloc memory\n");
+ err = -ENOMEM;
+ goto errout;
+ }
+
+ rx8025->client = client;
+ i2c_set_clientdata(client, rx8025);
+ INIT_WORK(&rx8025->work, rx8025_work);
+ mutex_init(&rx8025->mutex);
+
+ err = i2c_transfer(adapter, msg, ARRAY_SIZE(msg));
+ if (err < ARRAY_SIZE(msg)) {
+ err = err >= 0 ? 0 : err;
+ goto errout_free;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(zero_mask); ++i) {
+ if (result[i] & zero_mask[i]) {
+ dev_dbg(&adapter->dev, "%s: register=0x%02x, "
+ "value=0x%02x\n", __func__,
+ i, result[i]);
+ err = -ENODEV;
+ goto errout_free;
+ }
+ }
+
+ err = rx8025_init_client(client, &need_reset);
+ if (err)
+ goto errout_free;
+
+ rx8025->rtc = rtc_device_register(client->name, &client->dev,
+ &rx8025_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rx8025->rtc)) {
+ err = PTR_ERR(rx8025->rtc);
+ dev_err(&client->dev,
+ "unable to register the class device\n");
+ goto errout_free;
+ }
+
+ dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
+ if (client->irq >= 0) {
+ err = request_irq(client->irq, rx8025_irq, 0,
+ "rx8025", client);
+ if (err) {
+ dev_err(&client->dev, "unable to request IRQ\n");
+ goto errout_reg;
+ }
+ }
+
+
+ rx8025->rtc->irq_freq = 1;
+ rx8025->rtc->max_user_freq = 1;
+
+ err = rx8025_sysfs_register(&client->dev);
+ if (err)
+ goto errout_irq;
+
+ dev_info(&client->dev, "chip found\n");
+
+ if (need_reset) {
+ struct rtc_time tm;
+ dev_info(&client->dev,
+ "Bad conditions detected, resetting date\n");
+ rtc_time_to_tm(0, &tm); /* 1970/1/1 */
+ rx8025_set_time(&client->dev, &tm);
+ }
+ return 0;
+
+ errout_reg:
+ rtc_device_unregister(rx8025->rtc);
+
+ errout_irq:
+ if (client->irq >= 0)
+ free_irq(client->irq, client);
+
+ errout_free:
+ kfree(rx8025);
+
+ errout:
+ dev_err(&adapter->dev, "Probing for rx8025 failed\n");
+ return err;
+}
+
+static int __devexit rx8025_remove(struct i2c_client *client)
+{
+ struct rx8025_data *rx8025 = i2c_get_clientdata(client);
+
+ if (client->irq >= 0) {
+ mutex_lock(&rx8025->mutex);
+ rx8025->exiting = 1;
+ mutex_unlock(&rx8025->mutex);
+
+ free_irq(client->irq, client);
+ flush_scheduled_work();
+ }
+
+ rx8025_sysfs_unregister(&client->dev);
+ rtc_device_unregister(rx8025->rtc);
+ i2c_set_clientdata(client, NULL);
+ kfree(rx8025);
+ return 0;
+}
+
+static struct i2c_driver rx8025_driver = {
+ .driver = {
+ .name = "rtc-rx8025",
+ .owner = THIS_MODULE,
+ },
+ .probe = rx8025_probe,
+ .remove = __devexit_p(rx8025_remove),
+ .id_table = rx8025_id,
+};
+
+static int __init rx8025_init(void)
+{
+ return i2c_add_driver(&rx8025_driver);
+}
+
+static void __exit rx8025_exit(void)
+{
+ i2c_del_driver(&rx8025_driver);
+}
+
+MODULE_AUTHOR("Uwe Zeisberger <Uwe_Zeisberger <at> digi.com>"
+ " and modified by fengjh <at> rising.com.cn");
+MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver");
+MODULE_LICENSE("GPL");
+
+module_init(rx8025_init);
+module_exit(rx8025_exit);
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
