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318 lines
8.7 KiB
318 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* max1619.c - Part of lm_sensors, Linux kernel modules for hardware |
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* monitoring |
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* Copyright (C) 2003-2004 Oleksij Rempel <[email protected]> |
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* Jean Delvare <[email protected]> |
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* |
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* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim. |
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* It reports up to two temperatures (its own plus up to |
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* one external one). Complete datasheet can be |
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* obtained from Maxim's website at: |
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* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.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/mutex.h> |
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#include <linux/sysfs.h> |
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static const unsigned short normal_i2c[] = { |
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
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/* |
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* The MAX1619 registers |
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*/ |
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#define MAX1619_REG_R_MAN_ID 0xFE |
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#define MAX1619_REG_R_CHIP_ID 0xFF |
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#define MAX1619_REG_R_CONFIG 0x03 |
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#define MAX1619_REG_W_CONFIG 0x09 |
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#define MAX1619_REG_R_CONVRATE 0x04 |
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#define MAX1619_REG_W_CONVRATE 0x0A |
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#define MAX1619_REG_R_STATUS 0x02 |
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#define MAX1619_REG_R_LOCAL_TEMP 0x00 |
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#define MAX1619_REG_R_REMOTE_TEMP 0x01 |
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#define MAX1619_REG_R_REMOTE_HIGH 0x07 |
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#define MAX1619_REG_W_REMOTE_HIGH 0x0D |
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#define MAX1619_REG_R_REMOTE_LOW 0x08 |
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#define MAX1619_REG_W_REMOTE_LOW 0x0E |
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#define MAX1619_REG_R_REMOTE_CRIT 0x10 |
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#define MAX1619_REG_W_REMOTE_CRIT 0x12 |
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#define MAX1619_REG_R_TCRIT_HYST 0x11 |
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#define MAX1619_REG_W_TCRIT_HYST 0x13 |
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/* |
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* Conversions |
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*/ |
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static int temp_from_reg(int val) |
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{ |
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return (val & 0x80 ? val-0x100 : val) * 1000; |
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} |
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static int temp_to_reg(int val) |
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{ |
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return (val < 0 ? val+0x100*1000 : val) / 1000; |
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} |
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enum temp_index { |
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t_input1 = 0, |
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t_input2, |
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t_low2, |
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t_high2, |
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t_crit2, |
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t_hyst2, |
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t_num_regs |
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}; |
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/* |
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* Client data (each client gets its own) |
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*/ |
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struct max1619_data { |
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struct i2c_client *client; |
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struct mutex update_lock; |
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char valid; /* zero until following fields are valid */ |
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unsigned long last_updated; /* in jiffies */ |
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/* registers values */ |
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u8 temp[t_num_regs]; /* index with enum temp_index */ |
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u8 alarms; |
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}; |
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static const u8 regs_read[t_num_regs] = { |
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[t_input1] = MAX1619_REG_R_LOCAL_TEMP, |
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[t_input2] = MAX1619_REG_R_REMOTE_TEMP, |
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[t_low2] = MAX1619_REG_R_REMOTE_LOW, |
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[t_high2] = MAX1619_REG_R_REMOTE_HIGH, |
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[t_crit2] = MAX1619_REG_R_REMOTE_CRIT, |
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[t_hyst2] = MAX1619_REG_R_TCRIT_HYST, |
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}; |
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static const u8 regs_write[t_num_regs] = { |
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[t_low2] = MAX1619_REG_W_REMOTE_LOW, |
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[t_high2] = MAX1619_REG_W_REMOTE_HIGH, |
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[t_crit2] = MAX1619_REG_W_REMOTE_CRIT, |
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[t_hyst2] = MAX1619_REG_W_TCRIT_HYST, |
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}; |
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static struct max1619_data *max1619_update_device(struct device *dev) |
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{ |
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struct max1619_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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int config, i; |
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mutex_lock(&data->update_lock); |
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if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { |
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dev_dbg(&client->dev, "Updating max1619 data.\n"); |
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for (i = 0; i < t_num_regs; i++) |
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data->temp[i] = i2c_smbus_read_byte_data(client, |
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regs_read[i]); |
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data->alarms = i2c_smbus_read_byte_data(client, |
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MAX1619_REG_R_STATUS); |
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/* If OVERT polarity is low, reverse alarm bit */ |
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config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); |
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if (!(config & 0x20)) |
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data->alarms ^= 0x02; |
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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->update_lock); |
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return data; |
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} |
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/* |
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* Sysfs stuff |
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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 max1619_data *data = max1619_update_device(dev); |
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return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); |
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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 max1619_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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long val; |
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int err = kstrtol(buf, 10, &val); |
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if (err) |
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return err; |
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mutex_lock(&data->update_lock); |
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data->temp[attr->index] = temp_to_reg(val); |
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i2c_smbus_write_byte_data(client, regs_write[attr->index], |
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data->temp[attr->index]); |
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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 alarms_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct max1619_data *data = max1619_update_device(dev); |
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return sprintf(buf, "%d\n", data->alarms); |
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} |
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static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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int bitnr = to_sensor_dev_attr(attr)->index; |
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struct max1619_data *data = max1619_update_device(dev); |
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return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); |
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} |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input1); |
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, t_input2); |
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static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, t_low2); |
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, t_high2); |
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static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, t_crit2); |
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static SENSOR_DEVICE_ATTR_RW(temp2_crit_hyst, temp, t_hyst2); |
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static DEVICE_ATTR_RO(alarms); |
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static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3); |
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4); |
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static struct attribute *max1619_attrs[] = { |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_temp2_input.dev_attr.attr, |
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&sensor_dev_attr_temp2_min.dev_attr.attr, |
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&sensor_dev_attr_temp2_max.dev_attr.attr, |
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&sensor_dev_attr_temp2_crit.dev_attr.attr, |
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&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, |
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&dev_attr_alarms.attr, |
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_fault.dev_attr.attr, |
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(max1619); |
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/* Return 0 if detection is successful, -ENODEV otherwise */ |
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static int max1619_detect(struct i2c_client *client, |
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struct i2c_board_info *info) |
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{ |
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struct i2c_adapter *adapter = client->adapter; |
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u8 reg_config, reg_convrate, reg_status, man_id, chip_id; |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
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return -ENODEV; |
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/* detection */ |
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reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); |
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reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE); |
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reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS); |
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if ((reg_config & 0x03) != 0x00 |
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|| reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { |
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dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", |
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client->addr); |
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return -ENODEV; |
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} |
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/* identification */ |
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man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID); |
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chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID); |
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if (man_id != 0x4D || chip_id != 0x04) { |
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dev_info(&adapter->dev, |
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"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", |
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man_id, chip_id); |
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return -ENODEV; |
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} |
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strlcpy(info->type, "max1619", I2C_NAME_SIZE); |
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return 0; |
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} |
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static void max1619_init_client(struct i2c_client *client) |
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{ |
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u8 config; |
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/* |
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* Start the conversions. |
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*/ |
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i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, |
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5); /* 2 Hz */ |
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config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); |
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if (config & 0x40) |
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i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, |
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config & 0xBF); /* run */ |
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} |
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static int max1619_probe(struct i2c_client *new_client) |
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{ |
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struct max1619_data *data; |
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struct device *hwmon_dev; |
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data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data), |
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GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->client = new_client; |
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mutex_init(&data->update_lock); |
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/* Initialize the MAX1619 chip */ |
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max1619_init_client(new_client); |
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hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev, |
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new_client->name, |
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data, |
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max1619_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 max1619_id[] = { |
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{ "max1619", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, max1619_id); |
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#ifdef CONFIG_OF |
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static const struct of_device_id max1619_of_match[] = { |
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{ .compatible = "maxim,max1619", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, max1619_of_match); |
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#endif |
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static struct i2c_driver max1619_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "max1619", |
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.of_match_table = of_match_ptr(max1619_of_match), |
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}, |
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.probe_new = max1619_probe, |
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.id_table = max1619_id, |
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.detect = max1619_detect, |
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.address_list = normal_i2c, |
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}; |
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module_i2c_driver(max1619_driver); |
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MODULE_AUTHOR("Oleksij Rempel <[email protected]>, Jean Delvare <[email protected]>"); |
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MODULE_DESCRIPTION("MAX1619 sensor driver"); |
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MODULE_LICENSE("GPL");
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