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-rw-r--r--drivers/hwmon/lm95234.c733
1 files changed, 733 insertions, 0 deletions
diff --git a/drivers/hwmon/lm95234.c b/drivers/hwmon/lm95234.c
new file mode 100644
index 000000000..b4a9d0c22
--- /dev/null
+++ b/drivers/hwmon/lm95234.c
@@ -0,0 +1,733 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ */
+
+#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 temp_show(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 alarm_show(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 type_show(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 type_store(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 tcrit2_show(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 tcrit2_store(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 tcrit2_hyst_show(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 tcrit1_show(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 tcrit1_store(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 tcrit1_hyst_show(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 tcrit1_hyst_store(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 offset_show(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 offset_store(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_RO(temp1_input, temp, 0);
+static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
+static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
+static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
+static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4);
+
+static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, BIT(0) | BIT(1));
+static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, BIT(2) | BIT(3));
+static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, BIT(4) | BIT(5));
+static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, BIT(6) | BIT(7));
+
+static SENSOR_DEVICE_ATTR_RW(temp2_type, type, BIT(1));
+static SENSOR_DEVICE_ATTR_RW(temp3_type, type, BIT(2));
+static SENSOR_DEVICE_ATTR_RW(temp4_type, type, BIT(3));
+static SENSOR_DEVICE_ATTR_RW(temp5_type, type, BIT(4));
+
+static SENSOR_DEVICE_ATTR_RW(temp1_max, tcrit1, 0);
+static SENSOR_DEVICE_ATTR_RW(temp2_max, tcrit2, 0);
+static SENSOR_DEVICE_ATTR_RW(temp3_max, tcrit2, 1);
+static SENSOR_DEVICE_ATTR_RW(temp4_max, tcrit1, 3);
+static SENSOR_DEVICE_ATTR_RW(temp5_max, tcrit1, 4);
+
+static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, tcrit1_hyst, 0);
+static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, tcrit2_hyst, 0);
+static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, tcrit2_hyst, 1);
+static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, tcrit1_hyst, 3);
+static SENSOR_DEVICE_ATTR_RO(temp5_max_hyst, tcrit1_hyst, 4);
+
+static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, BIT(0 + 8));
+static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, BIT(1 + 16));
+static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, BIT(2 + 16));
+static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, BIT(3 + 8));
+static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, BIT(4 + 8));
+
+static SENSOR_DEVICE_ATTR_RW(temp2_crit, tcrit1, 1);
+static SENSOR_DEVICE_ATTR_RW(temp3_crit, tcrit1, 2);
+
+static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, tcrit1_hyst, 1);
+static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, tcrit1_hyst, 2);
+
+static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, BIT(1 + 8));
+static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, BIT(2 + 8));
+
+static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 0);
+static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 1);
+static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 2);
+static SENSOR_DEVICE_ATTR_RW(temp5_offset, 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;
+
+ strscpy(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 const struct i2c_device_id lm95234_id[];
+
+static int lm95234_probe(struct i2c_client *client)
+{
+ 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 (i2c_match_id(lm95234_id, client)->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_new = 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 08:50:03 +0000