--- /dev/null
+/*
+ emc2103.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 const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
+static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
+static const 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
+
+/* equation 4 from datasheet: rpm = (3932160 * multipler) / count */
+#define FAN_RPM_FACTOR 3932160
+
+/* 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes
+ * in anti-parallel mode, and in this configuration both can be read
+ * independently (so we have 4 temperature inputs). The device can't
+ * detect if it's connected in this mode, so we have to manually enable
+ * it. Default is to leave the device in the state it's already in (-1).
+ * This parameter allows APD mode to be optionally forced on or off */
+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 emc2103_data {
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+ bool valid; /* registers are valid */
+ bool fan_rpm_control;
+ int temp_count; /* num of temp sensors */
+ 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_multiplier;
+ u16 fan_tach;
+ u16 fan_target;
+};
+
+static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
+{
+ int status = i2c_smbus_read_byte_data(client, i2c_reg);
+ if (status < 0) {
+ dev_warn(&client->dev, "reg 0x%02x, err %d\n",
+ i2c_reg, status);
+ } else {
+ *output = status;
+ }
+ return status;
+}
+
+static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
+ struct temperature *temp)
+{
+ u8 degrees, fractional;
+
+ if (read_u8_from_i2c(client, i2c_reg, °rees) < 0)
+ return;
+
+ if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
+ return;
+
+ temp->degrees = degrees;
+ temp->fraction = (fractional & 0xe0) >> 5;
+}
+
+static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
+ u8 hi_addr, u8 lo_addr)
+{
+ u8 high_byte, lo_byte;
+
+ if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
+ return;
+
+ if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
+ return;
+
+ *output = ((u16)high_byte << 5) | (lo_byte >> 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_config_from_i2c(struct i2c_client *client)
+
+{
+ struct emc2103_data *data = i2c_get_clientdata(client);
+ u8 conf1;
+
+ if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
+ return;
+
+ data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
+ data->fan_rpm_control = (conf1 & 0x80) != 0;
+}
+
+static struct emc2103_data *emc2103_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct emc2103_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;
+
+ for (i = 0; i < data->temp_count; i++) {
+ read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
+ read_u8_from_i2c(client, REG_TEMP_MIN[i],
+ &data->temp_min[i]);
+ read_u8_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_config_from_i2c(client);
+
+ 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)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct emc2103_data *data = emc2103_update_device(dev);
+ int millidegrees = data->temp[nr].degrees * 1000
+ + data->temp[nr].fraction * 125;
+ return sprintf(buf, "%d\n", millidegrees);
+}
+
+static ssize_t
+show_temp_min(struct device *dev, struct device_attribute *da, char *buf)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct emc2103_data *data = emc2103_update_device(dev);
+ int millidegrees = data->temp_min[nr] * 1000;
+ return sprintf(buf, "%d\n", millidegrees);
+}
+
+static ssize_t
+show_temp_max(struct device *dev, struct device_attribute *da, char *buf)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct emc2103_data *data = emc2103_update_device(dev);
+ int millidegrees = data->temp_max[nr] * 1000;
+ return sprintf(buf, "%d\n", millidegrees);
+}
+
+static ssize_t
+show_temp_fault(struct device *dev, struct device_attribute *da, char *buf)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct emc2103_data *data = emc2103_update_device(dev);
+ bool fault = (data->temp[nr].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)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct emc2103_data *data = emc2103_update_device(dev);
+ bool alarm = data->temp_min_alarm & (1 << nr);
+ return sprintf(buf, "%d\n", alarm ? 1 : 0);
+}
+
+static ssize_t
+show_temp_max_alarm(struct device *dev, struct device_attribute *da, char *buf)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct emc2103_data *data = emc2103_update_device(dev);
+ bool alarm = data->temp_max_alarm & (1 << nr);
+ return sprintf(buf, "%d\n", alarm ? 1 : 0);
+}
+
+static ssize_t set_temp_min(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct emc2103_data *data = i2c_get_clientdata(client);
+ long val;
+
+ int result = strict_strtol(buf, 10, &val);
+ if (result < 0)
+ return -EINVAL;
+
+ val = DIV_ROUND_CLOSEST(val, 1000);
+ if ((val < -63) || (val > 127))
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->temp_min[nr] = val;
+ i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], 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)
+{
+ int nr = to_sensor_dev_attr(da)->index;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct emc2103_data *data = i2c_get_clientdata(client);
+ long val;
+
+ int result = strict_strtol(buf, 10, &val);
+ if (result < 0)
+ return -EINVAL;
+
+ val = DIV_ROUND_CLOSEST(val, 1000);
+ if ((val < -63) || (val > 127))
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->temp_max[nr] = val;
+ i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t
+show_fan(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct emc2103_data *data = emc2103_update_device(dev);
+ int rpm = 0;
+ if (data->fan_tach != 0)
+ rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / 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 emc2103_data *data = emc2103_update_device(dev);
+ int fan_div = 8 / data->fan_multiplier;
+ 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 emc2103_data *data = emc2103_update_device(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+ int new_range_bits, old_div = 8 / data->fan_multiplier;
+ long new_div;
+
+ int status = strict_strtol(buf, 10, &new_div);
+ if (status < 0)
+ return -EINVAL;
+
+ if (new_div == old_div) /* No change */
+ return count;
+
+ switch (new_div) {
+ case 1:
+ new_range_bits = 3;
+ break;
+ case 2:
+ new_range_bits = 2;
+ break;
+ case 4:
+ new_range_bits = 1;
+ break;
+ case 8:
+ new_range_bits = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mutex_lock(&data->update_lock);
+
+ 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 |= (new_range_bits << 5);
+ i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
+
+ data->fan_multiplier = 8 / new_div;
+
+ /* update fan target if high byte is not disabled */
+ if ((data->fan_target & 0x1fe0) != 0x1fe0) {
+ u16 new_target = (data->fan_target * old_div) / new_div;
+ data->fan_target = min(new_target, (u16)0x1fff);
+ 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 emc2103_data *data = emc2103_update_device(dev);
+ int rpm = 0;
+
+ /* high byte of 0xff indicates disabled so return 0 */
+ if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
+ rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
+ / data->fan_target;
+
+ 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 emc2103_data *data = emc2103_update_device(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+ long rpm_target;
+
+ int result = strict_strtol(buf, 10, &rpm_target);
+ if (result < 0)
+ return -EINVAL;
+
+ /* Datasheet states 16384 as maximum RPM target (table 3.2) */
+ 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 = SENSORS_LIMIT(
+ (FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
+ 0, 0x1fff);
+
+ write_fan_target_to_i2c(client, data->fan_target);
+
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static ssize_t
+show_fan_fault(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct emc2103_data *data = emc2103_update_device(dev);
+ bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
+ return sprintf(buf, "%d\n", fault ? 1 : 0);
+}
+
+static ssize_t
+show_pwm_enable(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct emc2103_data *data = emc2103_update_device(dev);
+ return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0);
+}
+
+static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct emc2103_data *data = i2c_get_clientdata(client);
+ long new_value;
+ u8 conf_reg;
+
+ int result = strict_strtol(buf, 10, &new_value);
+ if (result < 0)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ switch (new_value) {
+ case 0:
+ data->fan_rpm_control = false;
+ break;
+ case 3:
+ data->fan_rpm_control = true;
+ break;
+ default:
+ mutex_unlock(&data->update_lock);
+ return -EINVAL;
+ }
+
+ read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
+
+ if (data->fan_rpm_control)
+ conf_reg |= 0x80;
+ else
+ conf_reg &= ~0x80;
+
+ i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);
+
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp_min,
+ set_temp_min, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp_max,
+ set_temp_max, 0);
+static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_temp_min_alarm,
+ NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_temp_max_alarm,
+ NULL, 0);
+
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, show_temp_min,
+ set_temp_min, 1);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, show_temp_max,
+ set_temp_max, 1);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_temp_min_alarm,
+ NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_temp_max_alarm,
+ NULL, 1);
+
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, show_temp_min,
+ set_temp_min, 2);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, show_temp_max,
+ set_temp_max, 2);
+static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_temp_min_alarm,
+ NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_temp_max_alarm,
+ NULL, 2);
+
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR, show_temp_min,
+ set_temp_min, 3);
+static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR, show_temp_max,
+ set_temp_max, 3);
+static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_temp_min_alarm,
+ NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_temp_max_alarm,
+ NULL, 3);
+
+static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL);
+static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div, set_fan_div);
+static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_fan_target,
+ set_fan_target);
+static DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL);
+
+static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
+ set_pwm_enable);
+
+/* sensors present on all models */
+static struct attribute *emc2103_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,
+ &dev_attr_fan1_input.attr,
+ &dev_attr_fan1_div.attr,
+ &dev_attr_fan1_target.attr,
+ &dev_attr_fan1_fault.attr,
+ &dev_attr_pwm1_enable.attr,
+ NULL
+};
+
+/* extra temperature sensors only present on 2103-2 and 2103-4 */
+static struct attribute *emc2103_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 *emc2103_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 emc2103_group = {
+ .attrs = emc2103_attributes,
+};
+
+static const struct attribute_group emc2103_temp3_group = {
+ .attrs = emc2103_attributes_temp3,
+};
+
+static const struct attribute_group emc2103_temp4_group = {
+ .attrs = emc2103_attributes_temp4,
+};
+
+static int
+emc2103_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct emc2103_data *data;
+ int status;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EIO;
+
+ data = kzalloc(sizeof(struct emc2103_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);
+ if (status == 0x24) {
+ /* 2103-1 only has 1 external diode */
+ data->temp_count = 2;
+ } else {
+ /* 2103-2 and 2103-4 have 3 or 4 external diodes */
+ 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);
+ goto exit_free;
+ }
+
+ /* detect current state of hardware */
+ data->temp_count = (status & 0x01) ? 4 : 3;
+
+ /* force APD state if module parameter is set */
+ if (apd == 0) {
+ /* force APD mode off */
+ data->temp_count = 3;
+ status &= ~(0x01);
+ i2c_smbus_write_byte_data(client, REG_CONF1, status);
+ } else if (apd == 1) {
+ /* force APD mode on */
+ data->temp_count = 4;
+ status |= 0x01;
+ i2c_smbus_write_byte_data(client, REG_CONF1, status);
+ }
+ }
+
+ /* Register sysfs hooks */
+ status = sysfs_create_group(&client->dev.kobj, &emc2103_group);
+ if (status)
+ goto exit_free;
+
+ if (data->temp_count >= 3) {
+ status = sysfs_create_group(&client->dev.kobj,
+ &emc2103_temp3_group);
+ if (status)
+ goto exit_remove;
+ }
+
+ if (data->temp_count == 4) {
+ status = sysfs_create_group(&client->dev.kobj,
+ &emc2103_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->temp_count == 4)
+ sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
+exit_remove_temp3:
+ if (data->temp_count >= 3)
+ sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
+exit_remove:
+ sysfs_remove_group(&client->dev.kobj, &emc2103_group);
+exit_free:
+ kfree(data);
+ return status;
+}
+
+static int emc2103_remove(struct i2c_client *client)
+{
+ struct emc2103_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+
+ if (data->temp_count == 4)
+ sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
+
+ if (data->temp_count >= 3)
+ sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
+
+ sysfs_remove_group(&client->dev.kobj, &emc2103_group);
+
+ kfree(data);
+ return 0;
+}
+
+static const struct i2c_device_id emc2103_ids[] = {
+ { "emc2103", 0, },
+ { /* LIST END */ }
+};
+MODULE_DEVICE_TABLE(i2c, emc2103_ids);
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int
+emc2103_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, "emc2103", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static struct i2c_driver emc2103_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "emc2103",
+ },
+ .probe = emc2103_probe,
+ .remove = emc2103_remove,
+ .id_table = emc2103_ids,
+ .detect = emc2103_detect,
+ .address_list = normal_i2c,
+};
+
+static int __init sensors_emc2103_init(void)
+{
+ return i2c_add_driver(&emc2103_driver);
+}
+
+static void __exit sensors_emc2103_exit(void)
+{
+ i2c_del_driver(&emc2103_driver);
+}
+
+MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
+MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_emc2103_init);
+module_exit(sensors_emc2103_exit);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff