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