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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Driver for TI ADC128D818 System Monitor with Temperature Sensor
- *
- * Copyright (c) 2014 Guenter Roeck
- *
- * Derived from lm80.c
- * Copyright (C) 1998, 1999 Frodo Looijaard <[email protected]>
- * and Philip Edelbrock <[email protected]>
- */
- #include <linux/module.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/regulator/consumer.h>
- #include <linux/mutex.h>
- #include <linux/bitops.h>
- #include <linux/of.h>
- /* Addresses to scan
- * The chip also supports addresses 0x35..0x37. Don't scan those addresses
- * since they are also used by some EEPROMs, which may result in false
- * positives.
- */
- static const unsigned short normal_i2c[] = {
- 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
- /* registers */
- #define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
- #define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
- #define ADC128_REG_IN(nr) (0x20 + (nr))
- #define ADC128_REG_TEMP 0x27
- #define ADC128_REG_TEMP_MAX 0x38
- #define ADC128_REG_TEMP_HYST 0x39
- #define ADC128_REG_CONFIG 0x00
- #define ADC128_REG_ALARM 0x01
- #define ADC128_REG_MASK 0x03
- #define ADC128_REG_CONV_RATE 0x07
- #define ADC128_REG_ONESHOT 0x09
- #define ADC128_REG_SHUTDOWN 0x0a
- #define ADC128_REG_CONFIG_ADV 0x0b
- #define ADC128_REG_BUSY_STATUS 0x0c
- #define ADC128_REG_MAN_ID 0x3e
- #define ADC128_REG_DEV_ID 0x3f
- /* No. of voltage entries in adc128_attrs */
- #define ADC128_ATTR_NUM_VOLT (8 * 4)
- /* Voltage inputs visible per operation mode */
- static const u8 num_inputs[] = { 7, 8, 4, 6 };
- struct adc128_data {
- struct i2c_client *client;
- struct regulator *regulator;
- int vref; /* Reference voltage in mV */
- struct mutex update_lock;
- u8 mode; /* Operation mode */
- bool valid; /* true if following fields are valid */
- unsigned long last_updated; /* In jiffies */
- u16 in[3][8]; /* Register value, normalized to 12 bit
- * 0: input voltage
- * 1: min limit
- * 2: max limit
- */
- s16 temp[3]; /* Register value, normalized to 9 bit
- * 0: sensor 1: limit 2: hyst
- */
- u8 alarms; /* alarm register value */
- };
- static struct adc128_data *adc128_update_device(struct device *dev)
- {
- struct adc128_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- struct adc128_data *ret = data;
- int i, rv;
- mutex_lock(&data->update_lock);
- if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- for (i = 0; i < num_inputs[data->mode]; i++) {
- rv = i2c_smbus_read_word_swapped(client,
- ADC128_REG_IN(i));
- if (rv < 0)
- goto abort;
- data->in[0][i] = rv >> 4;
- rv = i2c_smbus_read_byte_data(client,
- ADC128_REG_IN_MIN(i));
- if (rv < 0)
- goto abort;
- data->in[1][i] = rv << 4;
- rv = i2c_smbus_read_byte_data(client,
- ADC128_REG_IN_MAX(i));
- if (rv < 0)
- goto abort;
- data->in[2][i] = rv << 4;
- }
- if (data->mode != 1) {
- rv = i2c_smbus_read_word_swapped(client,
- ADC128_REG_TEMP);
- if (rv < 0)
- goto abort;
- data->temp[0] = rv >> 7;
- rv = i2c_smbus_read_byte_data(client,
- ADC128_REG_TEMP_MAX);
- if (rv < 0)
- goto abort;
- data->temp[1] = rv << 1;
- rv = i2c_smbus_read_byte_data(client,
- ADC128_REG_TEMP_HYST);
- if (rv < 0)
- goto abort;
- data->temp[2] = rv << 1;
- }
- rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
- if (rv < 0)
- goto abort;
- data->alarms |= rv;
- data->last_updated = jiffies;
- data->valid = true;
- }
- goto done;
- abort:
- ret = ERR_PTR(rv);
- data->valid = false;
- done:
- mutex_unlock(&data->update_lock);
- return ret;
- }
- static ssize_t adc128_in_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct adc128_data *data = adc128_update_device(dev);
- int index = to_sensor_dev_attr_2(attr)->index;
- int nr = to_sensor_dev_attr_2(attr)->nr;
- int val;
- if (IS_ERR(data))
- return PTR_ERR(data);
- val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
- return sprintf(buf, "%d\n", val);
- }
- static ssize_t adc128_in_store(struct device *dev,
- struct device_attribute *attr, const char *buf,
- size_t count)
- {
- struct adc128_data *data = dev_get_drvdata(dev);
- int index = to_sensor_dev_attr_2(attr)->index;
- int nr = to_sensor_dev_attr_2(attr)->nr;
- u8 reg, regval;
- long val;
- int err;
- err = kstrtol(buf, 10, &val);
- if (err < 0)
- return err;
- mutex_lock(&data->update_lock);
- /* 10 mV LSB on limit registers */
- regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
- data->in[index][nr] = regval << 4;
- reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
- i2c_smbus_write_byte_data(data->client, reg, regval);
- mutex_unlock(&data->update_lock);
- return count;
- }
- static ssize_t adc128_temp_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct adc128_data *data = adc128_update_device(dev);
- int index = to_sensor_dev_attr(attr)->index;
- int temp;
- if (IS_ERR(data))
- return PTR_ERR(data);
- temp = sign_extend32(data->temp[index], 8);
- return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
- }
- static ssize_t adc128_temp_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct adc128_data *data = dev_get_drvdata(dev);
- int index = to_sensor_dev_attr(attr)->index;
- long val;
- int err;
- s8 regval;
- err = kstrtol(buf, 10, &val);
- if (err < 0)
- return err;
- mutex_lock(&data->update_lock);
- regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
- data->temp[index] = regval << 1;
- i2c_smbus_write_byte_data(data->client,
- index == 1 ? ADC128_REG_TEMP_MAX
- : ADC128_REG_TEMP_HYST,
- regval);
- mutex_unlock(&data->update_lock);
- return count;
- }
- static ssize_t adc128_alarm_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct adc128_data *data = adc128_update_device(dev);
- int mask = 1 << to_sensor_dev_attr(attr)->index;
- u8 alarms;
- if (IS_ERR(data))
- return PTR_ERR(data);
- /*
- * Clear an alarm after reporting it to user space. If it is still
- * active, the next update sequence will set the alarm bit again.
- */
- alarms = data->alarms;
- data->alarms &= ~mask;
- return sprintf(buf, "%u\n", !!(alarms & mask));
- }
- static umode_t adc128_is_visible(struct kobject *kobj,
- struct attribute *attr, int index)
- {
- struct device *dev = kobj_to_dev(kobj);
- struct adc128_data *data = dev_get_drvdata(dev);
- if (index < ADC128_ATTR_NUM_VOLT) {
- /* Voltage, visible according to num_inputs[] */
- if (index >= num_inputs[data->mode] * 4)
- return 0;
- } else {
- /* Temperature, visible if not in mode 1 */
- if (data->mode == 1)
- return 0;
- }
- return attr->mode;
- }
- static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2);
- static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2);
- static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2);
- static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2);
- static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2);
- static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2);
- static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2);
- static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0);
- static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1);
- static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2);
- static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0);
- static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1);
- static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2);
- static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0);
- static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1);
- static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2);
- static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3);
- static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4);
- static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5);
- static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6);
- static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7);
- static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7);
- static struct attribute *adc128_attrs[] = {
- &sensor_dev_attr_in0_alarm.dev_attr.attr,
- &sensor_dev_attr_in0_input.dev_attr.attr,
- &sensor_dev_attr_in0_max.dev_attr.attr,
- &sensor_dev_attr_in0_min.dev_attr.attr,
- &sensor_dev_attr_in1_alarm.dev_attr.attr,
- &sensor_dev_attr_in1_input.dev_attr.attr,
- &sensor_dev_attr_in1_max.dev_attr.attr,
- &sensor_dev_attr_in1_min.dev_attr.attr,
- &sensor_dev_attr_in2_alarm.dev_attr.attr,
- &sensor_dev_attr_in2_input.dev_attr.attr,
- &sensor_dev_attr_in2_max.dev_attr.attr,
- &sensor_dev_attr_in2_min.dev_attr.attr,
- &sensor_dev_attr_in3_alarm.dev_attr.attr,
- &sensor_dev_attr_in3_input.dev_attr.attr,
- &sensor_dev_attr_in3_max.dev_attr.attr,
- &sensor_dev_attr_in3_min.dev_attr.attr,
- &sensor_dev_attr_in4_alarm.dev_attr.attr,
- &sensor_dev_attr_in4_input.dev_attr.attr,
- &sensor_dev_attr_in4_max.dev_attr.attr,
- &sensor_dev_attr_in4_min.dev_attr.attr,
- &sensor_dev_attr_in5_alarm.dev_attr.attr,
- &sensor_dev_attr_in5_input.dev_attr.attr,
- &sensor_dev_attr_in5_max.dev_attr.attr,
- &sensor_dev_attr_in5_min.dev_attr.attr,
- &sensor_dev_attr_in6_alarm.dev_attr.attr,
- &sensor_dev_attr_in6_input.dev_attr.attr,
- &sensor_dev_attr_in6_max.dev_attr.attr,
- &sensor_dev_attr_in6_min.dev_attr.attr,
- &sensor_dev_attr_in7_alarm.dev_attr.attr,
- &sensor_dev_attr_in7_input.dev_attr.attr,
- &sensor_dev_attr_in7_max.dev_attr.attr,
- &sensor_dev_attr_in7_min.dev_attr.attr,
- &sensor_dev_attr_temp1_input.dev_attr.attr,
- &sensor_dev_attr_temp1_max.dev_attr.attr,
- &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
- &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
- NULL
- };
- static const struct attribute_group adc128_group = {
- .attrs = adc128_attrs,
- .is_visible = adc128_is_visible,
- };
- __ATTRIBUTE_GROUPS(adc128);
- static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
- {
- int man_id, dev_id;
- if (!i2c_check_functionality(client->adapter,
- I2C_FUNC_SMBUS_BYTE_DATA |
- I2C_FUNC_SMBUS_WORD_DATA))
- return -ENODEV;
- man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
- dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
- if (man_id != 0x01 || dev_id != 0x09)
- return -ENODEV;
- /* Check unused bits for confirmation */
- if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
- return -ENODEV;
- if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
- return -ENODEV;
- if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
- return -ENODEV;
- if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
- return -ENODEV;
- if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
- return -ENODEV;
- if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
- return -ENODEV;
- strscpy(info->type, "adc128d818", I2C_NAME_SIZE);
- return 0;
- }
- static int adc128_init_client(struct adc128_data *data)
- {
- struct i2c_client *client = data->client;
- int err;
- u8 regval = 0x0;
- /*
- * Reset chip to defaults.
- * This makes most other initializations unnecessary.
- */
- err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
- if (err)
- return err;
- /* Set operation mode, if non-default */
- if (data->mode != 0)
- regval |= data->mode << 1;
- /* If external vref is selected, configure the chip to use it */
- if (data->regulator)
- regval |= 0x01;
- /* Write advanced configuration register */
- if (regval != 0x0) {
- err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG_ADV,
- regval);
- if (err)
- return err;
- }
- /* Start monitoring */
- err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
- if (err)
- return err;
- return 0;
- }
- static int adc128_probe(struct i2c_client *client)
- {
- struct device *dev = &client->dev;
- struct regulator *regulator;
- struct device *hwmon_dev;
- struct adc128_data *data;
- int err, vref;
- data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- /* vref is optional. If specified, is used as chip reference voltage */
- regulator = devm_regulator_get_optional(dev, "vref");
- if (!IS_ERR(regulator)) {
- data->regulator = regulator;
- err = regulator_enable(regulator);
- if (err < 0)
- return err;
- vref = regulator_get_voltage(regulator);
- if (vref < 0) {
- err = vref;
- goto error;
- }
- data->vref = DIV_ROUND_CLOSEST(vref, 1000);
- } else {
- data->vref = 2560; /* 2.56V, in mV */
- }
- /* Operation mode is optional. If unspecified, keep current mode */
- if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
- if (data->mode > 3) {
- dev_err(dev, "invalid operation mode %d\n",
- data->mode);
- err = -EINVAL;
- goto error;
- }
- } else {
- err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
- if (err < 0)
- goto error;
- data->mode = (err >> 1) & ADC128_REG_MASK;
- }
- data->client = client;
- i2c_set_clientdata(client, data);
- mutex_init(&data->update_lock);
- /* Initialize the chip */
- err = adc128_init_client(data);
- if (err < 0)
- goto error;
- hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
- data, adc128_groups);
- if (IS_ERR(hwmon_dev)) {
- err = PTR_ERR(hwmon_dev);
- goto error;
- }
- return 0;
- error:
- if (data->regulator)
- regulator_disable(data->regulator);
- return err;
- }
- static void adc128_remove(struct i2c_client *client)
- {
- struct adc128_data *data = i2c_get_clientdata(client);
- if (data->regulator)
- regulator_disable(data->regulator);
- }
- static const struct i2c_device_id adc128_id[] = {
- { "adc128d818", 0 },
- { }
- };
- MODULE_DEVICE_TABLE(i2c, adc128_id);
- static const struct of_device_id __maybe_unused adc128_of_match[] = {
- { .compatible = "ti,adc128d818" },
- { },
- };
- MODULE_DEVICE_TABLE(of, adc128_of_match);
- static struct i2c_driver adc128_driver = {
- .class = I2C_CLASS_HWMON,
- .driver = {
- .name = "adc128d818",
- .of_match_table = of_match_ptr(adc128_of_match),
- },
- .probe_new = adc128_probe,
- .remove = adc128_remove,
- .id_table = adc128_id,
- .detect = adc128_detect,
- .address_list = normal_i2c,
- };
- module_i2c_driver(adc128_driver);
- MODULE_AUTHOR("Guenter Roeck");
- MODULE_DESCRIPTION("Driver for ADC128D818");
- MODULE_LICENSE("GPL");
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