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318 lines
7.7 KiB
318 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* An hwmon driver for the Analog Devices AD7416/17/18 |
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* Copyright (C) 2006-07 Tower Technologies |
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* |
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* Author: Alessandro Zummo <[email protected]> |
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* |
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* Based on lm75.c |
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* Copyright (C) 1998-99 Frodo Looijaard <[email protected]> |
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*/ |
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#include <linux/module.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/mutex.h> |
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#include <linux/of_device.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include "lm75.h" |
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#define DRV_VERSION "0.4" |
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enum chips { ad7416, ad7417, ad7418 }; |
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/* AD7418 registers */ |
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#define AD7418_REG_TEMP_IN 0x00 |
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#define AD7418_REG_CONF 0x01 |
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#define AD7418_REG_TEMP_HYST 0x02 |
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#define AD7418_REG_TEMP_OS 0x03 |
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#define AD7418_REG_ADC 0x04 |
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#define AD7418_REG_CONF2 0x05 |
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#define AD7418_REG_ADC_CH(x) ((x) << 5) |
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#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) |
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static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, |
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AD7418_REG_TEMP_HYST, |
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AD7418_REG_TEMP_OS }; |
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struct ad7418_data { |
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struct i2c_client *client; |
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enum chips type; |
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struct mutex lock; |
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int adc_max; /* number of ADC channels */ |
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char valid; |
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unsigned long last_updated; /* In jiffies */ |
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s16 temp[3]; /* Register values */ |
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u16 in[4]; |
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}; |
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static int ad7418_update_device(struct device *dev) |
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{ |
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struct ad7418_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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s32 val; |
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mutex_lock(&data->lock); |
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
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|| !data->valid) { |
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u8 cfg; |
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int i, ch; |
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/* read config register and clear channel bits */ |
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val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); |
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if (val < 0) |
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goto abort; |
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cfg = val; |
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cfg &= 0x1F; |
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val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, |
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cfg | AD7418_CH_TEMP); |
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if (val < 0) |
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goto abort; |
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udelay(30); |
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for (i = 0; i < 3; i++) { |
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val = i2c_smbus_read_word_swapped(client, |
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AD7418_REG_TEMP[i]); |
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if (val < 0) |
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goto abort; |
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data->temp[i] = val; |
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} |
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for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { |
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val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, |
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cfg | AD7418_REG_ADC_CH(ch)); |
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if (val < 0) |
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goto abort; |
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udelay(15); |
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val = i2c_smbus_read_word_swapped(client, |
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AD7418_REG_ADC); |
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if (val < 0) |
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goto abort; |
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data->in[data->adc_max - 1 - i] = val; |
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} |
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/* restore old configuration value */ |
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val = i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, |
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cfg); |
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if (val < 0) |
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goto abort; |
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data->last_updated = jiffies; |
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data->valid = 1; |
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} |
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mutex_unlock(&data->lock); |
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return 0; |
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abort: |
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data->valid = 0; |
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mutex_unlock(&data->lock); |
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return val; |
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} |
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static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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struct ad7418_data *data = dev_get_drvdata(dev); |
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int ret; |
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ret = ad7418_update_device(dev); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", |
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LM75_TEMP_FROM_REG(data->temp[attr->index])); |
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} |
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static ssize_t adc_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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struct ad7418_data *data = dev_get_drvdata(dev); |
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int ret; |
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ret = ad7418_update_device(dev); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", |
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((data->in[attr->index] >> 6) * 2500 + 512) / 1024); |
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} |
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static ssize_t temp_store(struct device *dev, |
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struct device_attribute *devattr, const char *buf, |
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size_t count) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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struct ad7418_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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long temp; |
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int ret = kstrtol(buf, 10, &temp); |
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if (ret < 0) |
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return ret; |
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mutex_lock(&data->lock); |
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data->temp[attr->index] = LM75_TEMP_TO_REG(temp); |
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i2c_smbus_write_word_swapped(client, |
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AD7418_REG_TEMP[attr->index], |
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data->temp[attr->index]); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2); |
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static SENSOR_DEVICE_ATTR_RO(in1_input, adc, 0); |
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static SENSOR_DEVICE_ATTR_RO(in2_input, adc, 1); |
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static SENSOR_DEVICE_ATTR_RO(in3_input, adc, 2); |
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static SENSOR_DEVICE_ATTR_RO(in4_input, adc, 3); |
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static struct attribute *ad7416_attrs[] = { |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(ad7416); |
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static struct attribute *ad7417_attrs[] = { |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_in1_input.dev_attr.attr, |
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&sensor_dev_attr_in2_input.dev_attr.attr, |
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&sensor_dev_attr_in3_input.dev_attr.attr, |
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&sensor_dev_attr_in4_input.dev_attr.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(ad7417); |
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static struct attribute *ad7418_attrs[] = { |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_in1_input.dev_attr.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(ad7418); |
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static void ad7418_init_client(struct i2c_client *client) |
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{ |
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struct ad7418_data *data = i2c_get_clientdata(client); |
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int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); |
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if (reg < 0) { |
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dev_err(&client->dev, "cannot read configuration register\n"); |
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} else { |
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dev_info(&client->dev, "configuring for mode 1\n"); |
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i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); |
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if (data->type == ad7417 || data->type == ad7418) |
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i2c_smbus_write_byte_data(client, |
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AD7418_REG_CONF2, 0x00); |
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} |
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} |
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static const struct i2c_device_id ad7418_id[]; |
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static int ad7418_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct i2c_adapter *adapter = client->adapter; |
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struct ad7418_data *data; |
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struct device *hwmon_dev; |
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const struct attribute_group **attr_groups = NULL; |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
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I2C_FUNC_SMBUS_WORD_DATA)) |
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return -EOPNOTSUPP; |
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data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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i2c_set_clientdata(client, data); |
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mutex_init(&data->lock); |
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data->client = client; |
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if (dev->of_node) |
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data->type = (enum chips)of_device_get_match_data(dev); |
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else |
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data->type = i2c_match_id(ad7418_id, client)->driver_data; |
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switch (data->type) { |
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case ad7416: |
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data->adc_max = 0; |
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attr_groups = ad7416_groups; |
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break; |
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case ad7417: |
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data->adc_max = 4; |
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attr_groups = ad7417_groups; |
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break; |
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case ad7418: |
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data->adc_max = 1; |
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attr_groups = ad7418_groups; |
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break; |
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} |
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dev_info(dev, "%s chip found\n", client->name); |
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/* Initialize the AD7418 chip */ |
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ad7418_init_client(client); |
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
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client->name, |
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data, attr_groups); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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} |
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static const struct i2c_device_id ad7418_id[] = { |
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{ "ad7416", ad7416 }, |
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{ "ad7417", ad7417 }, |
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{ "ad7418", ad7418 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, ad7418_id); |
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static const struct of_device_id ad7418_dt_ids[] = { |
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{ .compatible = "adi,ad7416", .data = (void *)ad7416, }, |
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{ .compatible = "adi,ad7417", .data = (void *)ad7417, }, |
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{ .compatible = "adi,ad7418", .data = (void *)ad7418, }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, ad7418_dt_ids); |
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static struct i2c_driver ad7418_driver = { |
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.driver = { |
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.name = "ad7418", |
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.of_match_table = ad7418_dt_ids, |
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}, |
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.probe_new = ad7418_probe, |
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.id_table = ad7418_id, |
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}; |
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module_i2c_driver(ad7418_driver); |
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MODULE_AUTHOR("Alessandro Zummo <[email protected]>"); |
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MODULE_DESCRIPTION("AD7416/17/18 driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_VERSION(DRV_VERSION);
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