SMSC's EMC2103 family of temperature/fan controllers have 1
onboard and up to 3 external temperature sensors, and allow
closed-loop control of one fan. This patch adds support for
them.
Signed-off-by: Steve Glendinning <steve.glendinning@xxxxxxxx>
---
MAINTAINERS | 6 +
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/smscemc.c | 675 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 692 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/smscemc.c
diff --git a/MAINTAINERS b/MAINTAINERS
index a8fe9b4..0fc4d50 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5178,6 +5178,12 @@ M: Nicolas Pitre <nico@xxxxxxxxxxx>
S: Odd Fixes
F: drivers/net/smc91x.*
+SMSC EMC2103 HARDWARE MONITOR DRIVER
+M: Steve Glendinning <steve.glendinning@xxxxxxxx>
+L: lm-sensors@xxxxxxxxxxxxxx
+S: Supported
+F: drivers/hwmon/smscemc.c
+
SMSC47B397 HARDWARE MONITOR DRIVER
M: "Mark M. Hoffman" <mhoffman@xxxxxxxxxxxxx>
L: lm-sensors@xxxxxxxxxxxxxx
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 9be8e17..6941d1c 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -782,6 +782,16 @@ config SENSORS_SMSC47M192
This driver can also be built as a module. If so, the module
will be called smsc47m192.
+config SENSORS_SMSCEMC
+ tristate "SMSC EMC2103"
+ depends on I2C
+ help
+ If you say yes here you get support for the temperature
+ and fan sensors of the SMSC EMC2103 chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called smscemc.
+
config SENSORS_SMSC47B397
tristate "SMSC LPC47B397-NC"
depends on EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 4aa1a3d..d28d12c 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -87,6 +87,7 @@ obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
+obj-$(CONFIG_SENSORS_SMSCEMC) += smscemc.o
obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o
obj-$(CONFIG_SENSORS_THMC50) += thmc50.o
obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
diff --git a/drivers/hwmon/smscemc.c b/drivers/hwmon/smscemc.c
new file mode 100644
index 0000000..c83a7be
--- /dev/null
+++ b/drivers/hwmon/smscemc.c
@@ -0,0 +1,675 @@
+/*
+ smscemc.c - Support for SMSC EMC2103
+ Copyright (c) 2010 SMSC
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+/* Addresses scanned */
+static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };
+
+static u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
+static u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
+static u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };
+
+#define REG_CONF1 (0x20)
+#define REG_TEMP_MAX_ALARM (0x24)
+#define REG_TEMP_MIN_ALARM (0x25)
+#define REG_FAN_CONF1 (0x42)
+#define REG_FAN_TARGET_LO (0x4c)
+#define REG_FAN_TARGET_HI (0x4d)
+#define REG_FAN_TACH_HI (0x4e)
+#define REG_FAN_TACH_LO (0x4f)
+#define REG_PRODUCT_ID (0xfd)
+#define REG_MFG_ID (0xfe)
+#define FAN_RPM_FACTOR (3932160)
+
+static int apd = 1;
+module_param(apd, bool, 0);
+MODULE_PARM_DESC(init, "Set to zero to disable anti-parallel diode mode");
+
+struct temperature {
+ s8 degrees;
+ u8 fraction; /* 0-7 multiples of 0.125 */
+};
+
+struct smscemc_data {
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+ bool valid; /* registers are valid */
+ bool fan_rpm_control;
+ bool have_temp3;
+ bool have_temp4;
+ unsigned long last_updated; /* in jiffies */
+ struct temperature temp[4]; /* internal + 3 external */
+ s8 temp_min[4]; /* no fractional part */
+ s8 temp_max[4]; /* no fractional part */
+ u8 temp_min_alarm;
+ u8 temp_max_alarm;
+ u8 fan_range;
+ u16 fan_tach;
+ u16 fan_target;
+};
+
+#define read_i2c_byte(i2c_reg) do { \
+ status = i2c_smbus_read_byte_data(client, i2c_reg); \
+ if (status < 0) { \
+ dev_dbg(&client->dev, "reg 0x%02x, err %d\n", \
+ i2c_reg, status); \
+ return; \
+ } } while (0)
+
+static void read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
+{
+ int status;
+ read_i2c_byte(i2c_reg);
+ *output = status;
+}
+
+static void read_s8_from_i2c(struct i2c_client *client, u8 i2c_reg, s8 *temp)
+{
+ int status;
+ read_i2c_byte(i2c_reg);
+ *temp = status;
+}
+
+static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
+ struct temperature *temp)
+{
+ int status;
+
+ /* read integer part */
+ read_i2c_byte(i2c_reg);
+ temp->degrees = status;
+
+ /* Read fractional part from the next register offset */
+ read_i2c_byte(i2c_reg + 1);
+ temp->fraction = (status & 0xe0) >> 5;
+}
+
+static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
+ u8 hi_addr, u8 lo_addr)
+{
+ int status;
+ u16 high_byte;
+
+ read_i2c_byte(hi_addr);
+ high_byte = status & 0xff;
+
+ read_i2c_byte(lo_addr);
+ *output = (high_byte << 5) | ((status & 0xf8) >> 3);
+}
+
+static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
+{
+ u8 high_byte = (new_target & 0x1fe0) >> 5;
+ u8 low_byte = (new_target & 0x001f) << 3;
+ i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
+ i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
+}
+
+static void read_fan_range_from_i2c(struct i2c_client *client, u8 *output)
+
+{
+ int status;
+ read_i2c_byte(REG_FAN_CONF1);
+ *output = (status & 0x60) >> 5;
+}
+
+static struct smscemc_data *smscemc_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smscemc_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+ || !data->valid) {
+ int i;
+
+ dev_dbg(&client->dev, "Starting smscemc update\n");
+
+ for (i = 0; i < 4; i++) {
+ read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
+ read_s8_from_i2c(client, REG_TEMP_MIN[i],
+ &data->temp_min[i]);
+ read_s8_from_i2c(client, REG_TEMP_MAX[i],
+ &data->temp_max[i]);
+ }
+
+ read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
+ &data->temp_min_alarm);
+ read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
+ &data->temp_max_alarm);
+
+ read_fan_from_i2c(client, &data->fan_tach,
+ REG_FAN_TACH_HI, REG_FAN_TACH_LO);
+ read_fan_from_i2c(client, &data->fan_target,
+ REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
+ read_fan_range_from_i2c(client, &data->fan_range);
+
+ data->last_updated = jiffies;
+ data->valid = true;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
+static ssize_t
+show_temp(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ int millidegrees = data->temp[attr->index].degrees * 1000
+ + data->temp[attr->index].fraction * 125;
+ return sprintf(buf, "%d\n", millidegrees);
+}
+
+static ssize_t
+show_temp_min(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ int millidegrees = data->temp_min[attr->index] * 1000;
+ return sprintf(buf, "%d\n", millidegrees);
+}
+
+static ssize_t
+show_temp_max(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ int millidegrees = data->temp_max[attr->index] * 1000;
+ return sprintf(buf, "%d\n", millidegrees);
+}
+
+static ssize_t
+show_temp_fault(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ bool fault = (data->temp[attr->index].degrees == -128);
+ return sprintf(buf, "%d\n", fault ? 1 : 0);
+}
+
+static ssize_t
+show_temp_min_alarm(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ bool alarm = data->temp_min_alarm & (1 << attr->index);
+ return sprintf(buf, "%d\n", alarm ? 1 : 0);
+}
+
+static ssize_t
+show_temp_max_alarm(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ bool alarm = data->temp_max_alarm & (1 << attr->index);
+ return sprintf(buf, "%d\n", alarm ? 1 : 0);
+}
+
+#define strtol_check(buf, val) do { \
+ int result = strict_strtol(buf, 10, &val); \
+ if (result < 0) \
+ return -EINVAL; \
+} while (0)
+
+static ssize_t set_temp_min(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+ long val;
+
+ strtol_check(buf, val);
+
+ val = val / 1000;
+ if ((val < -63) || (val > 127))
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->temp_min[attr->index] = val;
+ i2c_smbus_write_byte_data(client, REG_TEMP_MIN[attr->index], val);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t set_temp_max(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smscemc_data *data = smscemc_update_device(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+ long val;
+
+ strtol_check(buf, val);
+
+ if ((val < -63) || (val > 127))
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->temp_max[attr->index] = val;
+ i2c_smbus_write_byte_data(client, REG_TEMP_MAX[attr->index], val);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t
+show_fan(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct smscemc_data *data = smscemc_update_device(dev);
+ int fan_div = 1 << data->fan_range;
+ int rpm = (FAN_RPM_FACTOR * fan_div) / data->fan_tach;
+ return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t
+show_fan_div(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct smscemc_data *data = smscemc_update_device(dev);
+ int fan_div = 1 << data->fan_range;
+ return sprintf(buf, "%d\n", fan_div);
+}
+
+/* Note: we also update the fan target here, because its value is
+ determined in part by the fan clock divider. This follows the principle
+ of least surprise; the user doesn't expect the fan target to change just
+ because the divider changed. */
+static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct smscemc_data *data = smscemc_update_device(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+ int status, old_div = 1 << data->fan_range;
+ long new_div;
+
+ strtol_check(buf, new_div);
+
+ if (new_div == old_div) /* No change */
+ return count;
+
+ mutex_lock(&data->update_lock);
+ switch (new_div) {
+ case 1:
+ data->fan_range = 0;
+ break;
+ case 2:
+ data->fan_range = 1;
+ break;
+ case 4:
+ data->fan_range = 2;
+ break;
+ case 8:
+ data->fan_range = 3;
+ break;
+ default:
+ mutex_unlock(&data->update_lock);
+ return -EINVAL;
+ }
+
+ status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
+ if (status < 0) {
+ dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
+ REG_FAN_CONF1, status);
+ mutex_unlock(&data->update_lock);
+ return -EIO;
+ }
+ status &= 0x9F;
+ status |= (data->fan_range << 5) & 0x60;
+ i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
+
+ /* update fan target if high word is not disabled */
+ if ((data->fan_target & 0x1fe0) != 0x1fe0) {
+ data->fan_target = (data->fan_target * new_div) / old_div;
+ write_fan_target_to_i2c(client, data->fan_target);
+ }
+
+ /* invalidate data to force re-read from hardware */
+ data->valid = false;
+
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static ssize_t
+show_fan_target(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct smscemc_data *data = smscemc_update_device(dev);
+ int fan_div = 1 << data->fan_range;
+ int rpm = (FAN_RPM_FACTOR * fan_div) / data->fan_target;
+
+ /* high byte of 0xff = disabled so return 0 */
+ if ((data->fan_target & 0x1fe0) == 0x1fe0)
+ rpm = 0;
+
+ return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t set_fan_target(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct smscemc_data *data = smscemc_update_device(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+ long rpm_target;
+ int fan_div = 1 << data->fan_range;
+
+ strtol_check(buf, rpm_target);
+
+ if ((rpm_target < 0) || (rpm_target > 16384))
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+
+ if (rpm_target == 0)
+ data->fan_target = 0x1fff;
+ else
+ data->fan_target =
+ ((FAN_RPM_FACTOR * fan_div) / rpm_target) & 0x1fff;
+
+ write_fan_target_to_i2c(client, data->fan_target);
+
+ if (!data->fan_rpm_control) {
+ /* RPM control mode is not currently enabled */
+ int status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
+ if (status < 0) {
+ dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
+ REG_FAN_CONF1, status);
+ mutex_unlock(&data->update_lock);
+ return -EIO;
+ }
+ status |= 0x80;
+ i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
+
+ data->fan_rpm_control = true;
+ }
+
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static ssize_t
+show_fan_fault(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct smscemc_data *data = smscemc_update_device(dev);
+ bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
+ return sprintf(buf, "%d\n", fault ? 1 : 0);
+}
+
+#define TEMP_SENSOR(offset) \
+static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp, \
+ NULL, offset - 1); \
+static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
+ show_temp_min, set_temp_min, offset - 1); \
+static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
+ show_temp_max, set_temp_max, offset - 1); \
+static SENSOR_DEVICE_ATTR(temp##offset##_fault, S_IRUGO, \
+ show_temp_fault, NULL, offset - 1); \
+static SENSOR_DEVICE_ATTR(temp##offset##_min_alarm, S_IRUGO, \
+ show_temp_min_alarm, NULL, offset - 1); \
+static SENSOR_DEVICE_ATTR(temp##offset##_max_alarm, S_IRUGO, \
+ show_temp_max_alarm, NULL, offset - 1)
+
+TEMP_SENSOR(1);
+TEMP_SENSOR(2);
+TEMP_SENSOR(3);
+TEMP_SENSOR(4);
+
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div,
+ set_fan_div, 0);
+static SENSOR_DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_fan_target,
+ set_fan_target, 0);
+static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
+
+/* sensors present on all models */
+static struct attribute *smscemc_attributes[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_fault.dev_attr.attr,
+ &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp2_fault.dev_attr.attr,
+ &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_fan1_div.dev_attr.attr,
+ &sensor_dev_attr_fan1_target.dev_attr.attr,
+ &sensor_dev_attr_fan1_fault.dev_attr.attr,
+ NULL
+};
+
+/* extra temperature sensors only present on 2103-2 and 2103-4 */
+static struct attribute *smscemc_attributes_temp3[] = {
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_min.dev_attr.attr,
+ &sensor_dev_attr_temp3_max.dev_attr.attr,
+ &sensor_dev_attr_temp3_fault.dev_attr.attr,
+ &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+ NULL
+};
+
+/* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
+static struct attribute *smscemc_attributes_temp4[] = {
+ &sensor_dev_attr_temp4_input.dev_attr.attr,
+ &sensor_dev_attr_temp4_min.dev_attr.attr,
+ &sensor_dev_attr_temp4_max.dev_attr.attr,
+ &sensor_dev_attr_temp4_fault.dev_attr.attr,
+ &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group smscemc_group = {
+ .attrs = smscemc_attributes,
+};
+
+static const struct attribute_group smscemc_temp3_group = {
+ .attrs = smscemc_attributes_temp3,
+};
+
+static const struct attribute_group smscemc_temp4_group = {
+ .attrs = smscemc_attributes_temp4,
+};
+
+static int
+smscemc_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct smscemc_data *data;
+ int status;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
+ return -EIO;
+
+ data = kzalloc(sizeof(struct smscemc_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ /* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
+ status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
+ data->have_temp3 = (status == 0x26);
+
+ /* check if the device is already in RPM control mode */
+ status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
+ if (status < 0) {
+ dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
+ REG_FAN_CONF1, status);
+ return -EIO;
+ }
+ data->fan_rpm_control = (status & 0x80);
+
+ if (data->have_temp3) {
+ /* Configure anti-parallel diode mode */
+ data->have_temp4 = apd;
+ status = i2c_smbus_read_byte_data(client, REG_CONF1);
+ if (status < 0) {
+ dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1,
+ status);
+ return -EIO;
+ }
+
+ if (data->have_temp4)
+ status |= 0x01;
+ else
+ status &= ~(0x01);
+
+ i2c_smbus_write_byte_data(client, REG_CONF1, status & 0xff);
+ }
+
+ /* Register sysfs hooks */
+ status = sysfs_create_group(&client->dev.kobj, &smscemc_group);
+ if (status)
+ goto exit_free;
+
+ if (data->have_temp3) {
+ status = sysfs_create_group(&client->dev.kobj,
+ &smscemc_temp3_group);
+ if (status)
+ goto exit_remove;
+ }
+
+ if (data->have_temp4) {
+ status = sysfs_create_group(&client->dev.kobj,
+ &smscemc_temp4_group);
+ if (status)
+ goto exit_remove_temp3;
+ }
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ status = PTR_ERR(data->hwmon_dev);
+ goto exit_remove_temp4;
+ }
+
+ dev_info(&client->dev, "%s: sensor '%s'\n",
+ dev_name(data->hwmon_dev), client->name);
+
+ return 0;
+
+exit_remove_temp4:
+ if (data->have_temp4)
+ sysfs_remove_group(&client->dev.kobj, &smscemc_temp4_group);
+exit_remove_temp3:
+ if (data->have_temp3)
+ sysfs_remove_group(&client->dev.kobj, &smscemc_temp3_group);
+exit_remove:
+ sysfs_remove_group(&client->dev.kobj, &smscemc_group);
+exit_free:
+ i2c_set_clientdata(client, NULL);
+ kfree(data);
+ return status;
+}
+
+static int smscemc_remove(struct i2c_client *client)
+{
+ struct smscemc_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+
+ if (data->have_temp4)
+ sysfs_remove_group(&client->dev.kobj, &smscemc_temp4_group);
+
+ if (data->have_temp3)
+ sysfs_remove_group(&client->dev.kobj, &smscemc_temp3_group);
+
+ sysfs_remove_group(&client->dev.kobj, &smscemc_group);
+
+ i2c_set_clientdata(client, NULL);
+ kfree(data);
+ return 0;
+}
+
+static const struct i2c_device_id smscemc_ids[] = {
+ { "smscemc", 0, },
+ { /* LIST END */ }
+};
+MODULE_DEVICE_TABLE(i2c, smscemc_ids);
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int
+smscemc_detect(struct i2c_client *new_client, struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = new_client->adapter;
+ int manufacturer, product;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID);
+ if (manufacturer != 0x5D)
+ return -ENODEV;
+
+ product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
+ if ((product != 0x24) && (product != 0x26))
+ return -ENODEV;
+
+ strlcpy(info->type, "smscemc", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static struct i2c_driver smscemc_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "smscemc",
+ },
+ .probe = smscemc_probe,
+ .remove = smscemc_remove,
+ .id_table = smscemc_ids,
+ .detect = smscemc_detect,
+ .address_list = normal_i2c,
+};
+
+static int __init sensors_smscemc_init(void)
+{
+ return i2c_add_driver(&smscemc_driver);
+}
+
+static void __exit sensors_smscemc_exit(void)
+{
+ i2c_del_driver(&smscemc_driver);
+}
+
+MODULE_AUTHOR("Steve Glendinning <steve.glendinning@xxxxxxxx>");
+MODULE_DESCRIPTION("SMSC EMCxxxx hwmon driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_smscemc_init);
+module_exit(sensors_smscemc_exit);
--
1.6.6.1
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