diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/hwmon/lm95234.c | 768 |
1 files changed, 768 insertions, 0 deletions
diff --git a/drivers/hwmon/lm95234.c b/drivers/hwmon/lm95234.c new file mode 100644 index 000000000..c7fcc9e7f --- /dev/null +++ b/drivers/hwmon/lm95234.c @@ -0,0 +1,768 @@ +/* + * Driver for Texas Instruments / National Semiconductor LM95234 + * + * Copyright (c) 2013, 2014 Guenter Roeck <linux@roeck-us.net> + * + * Derived from lm95241.c + * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com> + * + * 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. + */ + +#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> +#include <linux/sysfs.h> + +#define DRVNAME "lm95234" + +enum chips { lm95233, lm95234 }; + +static const unsigned short normal_i2c[] = { + 0x18, 0x2a, 0x2b, 0x4d, 0x4e, I2C_CLIENT_END }; + +/* LM95234 registers */ +#define LM95234_REG_MAN_ID 0xFE +#define LM95234_REG_CHIP_ID 0xFF +#define LM95234_REG_STATUS 0x02 +#define LM95234_REG_CONFIG 0x03 +#define LM95234_REG_CONVRATE 0x04 +#define LM95234_REG_STS_FAULT 0x07 +#define LM95234_REG_STS_TCRIT1 0x08 +#define LM95234_REG_STS_TCRIT2 0x09 +#define LM95234_REG_TEMPH(x) ((x) + 0x10) +#define LM95234_REG_TEMPL(x) ((x) + 0x20) +#define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */ +#define LM95234_REG_UTEMPL(x) ((x) + 0x29) +#define LM95234_REG_REM_MODEL 0x30 +#define LM95234_REG_REM_MODEL_STS 0x38 +#define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */ +#define LM95234_REG_TCRIT1(x) ((x) + 0x40) +#define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */ +#define LM95234_REG_TCRIT_HYST 0x5a + +#define NATSEMI_MAN_ID 0x01 +#define LM95233_CHIP_ID 0x89 +#define LM95234_CHIP_ID 0x79 + +/* Client data (each client gets its own) */ +struct lm95234_data { + struct i2c_client *client; + const struct attribute_group *groups[3]; + struct mutex update_lock; + unsigned long last_updated, interval; /* in jiffies */ + bool valid; /* false until following fields are valid */ + /* registers values */ + int temp[5]; /* temperature (signed) */ + u32 status; /* fault/alarm status */ + u8 tcrit1[5]; /* critical temperature limit */ + u8 tcrit2[2]; /* high temperature limit */ + s8 toffset[4]; /* remote temperature offset */ + u8 thyst; /* common hysteresis */ + + u8 sensor_type; /* temperature sensor type */ +}; + +static int lm95234_read_temp(struct i2c_client *client, int index, int *t) +{ + int val; + u16 temp = 0; + + if (index) { + val = i2c_smbus_read_byte_data(client, + LM95234_REG_UTEMPH(index - 1)); + if (val < 0) + return val; + temp = val << 8; + val = i2c_smbus_read_byte_data(client, + LM95234_REG_UTEMPL(index - 1)); + if (val < 0) + return val; + temp |= val; + *t = temp; + } + /* + * Read signed temperature if unsigned temperature is 0, + * or if this is the local sensor. + */ + if (!temp) { + val = i2c_smbus_read_byte_data(client, + LM95234_REG_TEMPH(index)); + if (val < 0) + return val; + temp = val << 8; + val = i2c_smbus_read_byte_data(client, + LM95234_REG_TEMPL(index)); + if (val < 0) + return val; + temp |= val; + *t = (s16)temp; + } + return 0; +} + +static u16 update_intervals[] = { 143, 364, 1000, 2500 }; + +/* Fill value cache. Must be called with update lock held. */ + +static int lm95234_fill_cache(struct lm95234_data *data, + struct i2c_client *client) +{ + int i, ret; + + ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE); + if (ret < 0) + return ret; + + data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]); + + for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) { + ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i)); + if (ret < 0) + return ret; + data->tcrit1[i] = ret; + } + for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) { + ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i)); + if (ret < 0) + return ret; + data->tcrit2[i] = ret; + } + for (i = 0; i < ARRAY_SIZE(data->toffset); i++) { + ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i)); + if (ret < 0) + return ret; + data->toffset[i] = ret; + } + + ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST); + if (ret < 0) + return ret; + data->thyst = ret; + + ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); + if (ret < 0) + return ret; + data->sensor_type = ret; + + return 0; +} + +static int lm95234_update_device(struct lm95234_data *data) +{ + struct i2c_client *client = data->client; + int ret; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + data->interval) || + !data->valid) { + int i; + + if (!data->valid) { + ret = lm95234_fill_cache(data, client); + if (ret < 0) + goto abort; + } + + data->valid = false; + for (i = 0; i < ARRAY_SIZE(data->temp); i++) { + ret = lm95234_read_temp(client, i, &data->temp[i]); + if (ret < 0) + goto abort; + } + + ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT); + if (ret < 0) + goto abort; + data->status = ret; + + ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1); + if (ret < 0) + goto abort; + data->status |= ret << 8; + + ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2); + if (ret < 0) + goto abort; + data->status |= ret << 16; + + data->last_updated = jiffies; + data->valid = true; + } + ret = 0; +abort: + mutex_unlock(&data->update_lock); + + return ret; +} + +static ssize_t show_temp(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + return sprintf(buf, "%d\n", + DIV_ROUND_CLOSEST(data->temp[index] * 125, 32)); +} + +static ssize_t show_alarm(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + u32 mask = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + return sprintf(buf, "%u", !!(data->status & mask)); +} + +static ssize_t show_type(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + u8 mask = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n"); +} + +static ssize_t set_type(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + unsigned long val; + u8 mask = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + ret = kstrtoul(buf, 10, &val); + if (ret < 0) + return ret; + + if (val != 1 && val != 2) + return -EINVAL; + + mutex_lock(&data->update_lock); + if (val == 1) + data->sensor_type |= mask; + else + data->sensor_type &= ~mask; + data->valid = false; + i2c_smbus_write_byte_data(data->client, LM95234_REG_REM_MODEL, + data->sensor_type); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + return sprintf(buf, "%u", data->tcrit2[index] * 1000); +} + +static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + long val; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + ret = kstrtol(buf, 10, &val); + if (ret < 0) + return ret; + + val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127); + + mutex_lock(&data->update_lock); + data->tcrit2[index] = val; + i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t show_tcrit2_hyst(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + /* Result can be negative, so be careful with unsigned operands */ + return sprintf(buf, "%d", + ((int)data->tcrit2[index] - (int)data->thyst) * 1000); +} + +static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + + return sprintf(buf, "%u", data->tcrit1[index] * 1000); +} + +static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + long val; + + if (ret) + return ret; + + ret = kstrtol(buf, 10, &val); + if (ret < 0) + return ret; + + val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255); + + mutex_lock(&data->update_lock); + data->tcrit1[index] = val; + i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t show_tcrit1_hyst(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + /* Result can be negative, so be careful with unsigned operands */ + return sprintf(buf, "%d", + ((int)data->tcrit1[index] - (int)data->thyst) * 1000); +} + +static ssize_t set_tcrit1_hyst(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + long val; + + if (ret) + return ret; + + ret = kstrtol(buf, 10, &val); + if (ret < 0) + return ret; + + val = DIV_ROUND_CLOSEST(val, 1000); + val = clamp_val((int)data->tcrit1[index] - val, 0, 31); + + mutex_lock(&data->update_lock); + data->thyst = val; + i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t show_offset(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + return sprintf(buf, "%d", data->toffset[index] * 500); +} + +static ssize_t set_offset(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + int ret = lm95234_update_device(data); + long val; + + if (ret) + return ret; + + ret = kstrtol(buf, 10, &val); + if (ret < 0) + return ret; + + /* Accuracy is 1/2 degrees C */ + val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127); + + mutex_lock(&data->update_lock); + data->toffset[index] = val; + i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t update_interval_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int ret = lm95234_update_device(data); + + if (ret) + return ret; + + return sprintf(buf, "%lu\n", + DIV_ROUND_CLOSEST(data->interval * 1000, HZ)); +} + +static ssize_t update_interval_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lm95234_data *data = dev_get_drvdata(dev); + int ret = lm95234_update_device(data); + unsigned long val; + u8 regval; + + if (ret) + return ret; + + ret = kstrtoul(buf, 10, &val); + if (ret < 0) + return ret; + + for (regval = 0; regval < 3; regval++) { + if (val <= update_intervals[regval]) + break; + } + + mutex_lock(&data->update_lock); + data->interval = msecs_to_jiffies(update_intervals[regval]); + i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval); + mutex_unlock(&data->update_lock); + + return count; +} + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); +static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); +static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); +static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); +static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4); + +static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, + BIT(0) | BIT(1)); +static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, + BIT(2) | BIT(3)); +static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, + BIT(4) | BIT(5)); +static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, + BIT(6) | BIT(7)); + +static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type, + BIT(1)); +static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type, + BIT(2)); +static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type, + BIT(3)); +static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type, + BIT(4)); + +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1, + set_tcrit1, 0); +static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2, + set_tcrit2, 0); +static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2, + set_tcrit2, 1); +static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1, + set_tcrit1, 3); +static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1, + set_tcrit1, 4); + +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst, + set_tcrit1_hyst, 0); +static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0); +static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1); +static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3); +static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4); + +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, + BIT(0 + 8)); +static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, + BIT(1 + 16)); +static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, + BIT(2 + 16)); +static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, + BIT(3 + 8)); +static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, + BIT(4 + 8)); + +static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1, + set_tcrit1, 1); +static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1, + set_tcrit1, 2); + +static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1); +static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2); + +static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, + BIT(1 + 8)); +static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, + BIT(2 + 8)); + +static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset, + set_offset, 0); +static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset, + set_offset, 1); +static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset, + set_offset, 2); +static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset, + set_offset, 3); + +static DEVICE_ATTR_RW(update_interval); + +static struct attribute *lm95234_common_attrs[] = { + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp2_input.dev_attr.attr, + &sensor_dev_attr_temp3_input.dev_attr.attr, + &sensor_dev_attr_temp2_fault.dev_attr.attr, + &sensor_dev_attr_temp3_fault.dev_attr.attr, + &sensor_dev_attr_temp2_type.dev_attr.attr, + &sensor_dev_attr_temp3_type.dev_attr.attr, + &sensor_dev_attr_temp1_max.dev_attr.attr, + &sensor_dev_attr_temp2_max.dev_attr.attr, + &sensor_dev_attr_temp3_max.dev_attr.attr, + &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp2_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp3_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_crit.dev_attr.attr, + &sensor_dev_attr_temp3_crit.dev_attr.attr, + &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, + &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr, + &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, + &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_offset.dev_attr.attr, + &sensor_dev_attr_temp3_offset.dev_attr.attr, + &dev_attr_update_interval.attr, + NULL +}; + +static const struct attribute_group lm95234_common_group = { + .attrs = lm95234_common_attrs, +}; + +static struct attribute *lm95234_attrs[] = { + &sensor_dev_attr_temp4_input.dev_attr.attr, + &sensor_dev_attr_temp5_input.dev_attr.attr, + &sensor_dev_attr_temp4_fault.dev_attr.attr, + &sensor_dev_attr_temp5_fault.dev_attr.attr, + &sensor_dev_attr_temp4_type.dev_attr.attr, + &sensor_dev_attr_temp5_type.dev_attr.attr, + &sensor_dev_attr_temp4_max.dev_attr.attr, + &sensor_dev_attr_temp5_max.dev_attr.attr, + &sensor_dev_attr_temp4_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp5_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp4_offset.dev_attr.attr, + &sensor_dev_attr_temp5_offset.dev_attr.attr, + NULL +}; + +static const struct attribute_group lm95234_group = { + .attrs = lm95234_attrs, +}; + +static int lm95234_detect(struct i2c_client *client, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + int address = client->addr; + u8 config_mask, model_mask; + int mfg_id, chip_id, val; + const char *name; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID); + if (mfg_id != NATSEMI_MAN_ID) + return -ENODEV; + + chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID); + switch (chip_id) { + case LM95233_CHIP_ID: + if (address != 0x18 && address != 0x2a && address != 0x2b) + return -ENODEV; + config_mask = 0xbf; + model_mask = 0xf9; + name = "lm95233"; + break; + case LM95234_CHIP_ID: + if (address != 0x18 && address != 0x4d && address != 0x4e) + return -ENODEV; + config_mask = 0xbc; + model_mask = 0xe1; + name = "lm95234"; + break; + default: + return -ENODEV; + } + + val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS); + if (val & 0x30) + return -ENODEV; + + val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG); + if (val & config_mask) + return -ENODEV; + + val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE); + if (val & 0xfc) + return -ENODEV; + + val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); + if (val & model_mask) + return -ENODEV; + + val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS); + if (val & model_mask) + return -ENODEV; + + strlcpy(info->type, name, I2C_NAME_SIZE); + return 0; +} + +static int lm95234_init_client(struct i2c_client *client) +{ + int val, model; + + /* start conversion if necessary */ + val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG); + if (val < 0) + return val; + if (val & 0x40) + i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG, + val & ~0x40); + + /* If diode type status reports an error, try to fix it */ + val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS); + if (val < 0) + return val; + model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); + if (model < 0) + return model; + if (model & val) { + dev_notice(&client->dev, + "Fixing remote diode type misconfiguration (0x%x)\n", + val); + i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL, + model & ~val); + } + return 0; +} + +static int lm95234_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct lm95234_data *data; + struct device *hwmon_dev; + int err; + + data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + mutex_init(&data->update_lock); + + /* Initialize the LM95234 chip */ + err = lm95234_init_client(client); + if (err < 0) + return err; + + data->groups[0] = &lm95234_common_group; + if (id->driver_data == lm95234) + data->groups[1] = &lm95234_group; + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, + data, data->groups); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +/* Driver data (common to all clients) */ +static const struct i2c_device_id lm95234_id[] = { + { "lm95233", lm95233 }, + { "lm95234", lm95234 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm95234_id); + +static struct i2c_driver lm95234_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = DRVNAME, + }, + .probe = lm95234_probe, + .id_table = lm95234_id, + .detect = lm95234_detect, + .address_list = normal_i2c, +}; + +module_i2c_driver(lm95234_driver); + +MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); +MODULE_DESCRIPTION("LM95233/LM95234 sensor driver"); +MODULE_LICENSE("GPL"); |