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490 lines
14 KiB
490 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* adm1021.c - Part of lm_sensors, Linux kernel modules for hardware |
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* monitoring |
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* Copyright (c) 1998, 1999 Frodo Looijaard <[email protected]> and |
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* Philip Edelbrock <[email protected]> |
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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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/* Addresses to scan */ |
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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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enum chips { |
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adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 }; |
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/* adm1021 constants specified below */ |
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/* The adm1021 registers */ |
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/* Read-only */ |
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/* For nr in 0-1 */ |
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#define ADM1021_REG_TEMP(nr) (nr) |
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#define ADM1021_REG_STATUS 0x02 |
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/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */ |
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#define ADM1021_REG_MAN_ID 0xFE |
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/* ADM1021 = 0x0X, ADM1023 = 0x3X */ |
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#define ADM1021_REG_DEV_ID 0xFF |
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/* These use different addresses for reading/writing */ |
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#define ADM1021_REG_CONFIG_R 0x03 |
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#define ADM1021_REG_CONFIG_W 0x09 |
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#define ADM1021_REG_CONV_RATE_R 0x04 |
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#define ADM1021_REG_CONV_RATE_W 0x0A |
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/* These are for the ADM1023's additional precision on the remote temp sensor */ |
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#define ADM1023_REG_REM_TEMP_PREC 0x10 |
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#define ADM1023_REG_REM_OFFSET 0x11 |
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#define ADM1023_REG_REM_OFFSET_PREC 0x12 |
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#define ADM1023_REG_REM_TOS_PREC 0x13 |
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#define ADM1023_REG_REM_THYST_PREC 0x14 |
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/* limits */ |
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/* For nr in 0-1 */ |
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#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr)) |
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#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr)) |
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#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr)) |
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#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr)) |
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/* write-only */ |
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#define ADM1021_REG_ONESHOT 0x0F |
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/* Initial values */ |
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/* |
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* Note: Even though I left the low and high limits named os and hyst, |
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* they don't quite work like a thermostat the way the LM75 does. I.e., |
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* a lower temp than THYST actually triggers an alarm instead of |
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* clearing it. Weird, ey? --Phil |
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*/ |
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/* Each client has this additional data */ |
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struct adm1021_data { |
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struct i2c_client *client; |
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enum chips type; |
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const struct attribute_group *groups[3]; |
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struct mutex update_lock; |
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char valid; /* !=0 if following fields are valid */ |
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char low_power; /* !=0 if device in low power mode */ |
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unsigned long last_updated; /* In jiffies */ |
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int temp_max[2]; /* Register values */ |
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int temp_min[2]; |
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int temp[2]; |
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u8 alarms; |
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/* Special values for ADM1023 only */ |
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u8 remote_temp_offset; |
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u8 remote_temp_offset_prec; |
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}; |
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/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */ |
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static bool read_only; |
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static struct adm1021_data *adm1021_update_device(struct device *dev) |
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{ |
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struct adm1021_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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mutex_lock(&data->update_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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int i; |
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dev_dbg(dev, "Starting adm1021 update\n"); |
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for (i = 0; i < 2; i++) { |
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data->temp[i] = 1000 * |
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(s8) i2c_smbus_read_byte_data( |
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client, ADM1021_REG_TEMP(i)); |
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data->temp_max[i] = 1000 * |
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(s8) i2c_smbus_read_byte_data( |
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client, ADM1021_REG_TOS_R(i)); |
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if (data->type != lm84) { |
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data->temp_min[i] = 1000 * |
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(s8) i2c_smbus_read_byte_data(client, |
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ADM1021_REG_THYST_R(i)); |
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} |
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} |
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data->alarms = i2c_smbus_read_byte_data(client, |
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ADM1021_REG_STATUS) & 0x7c; |
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if (data->type == adm1023) { |
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/* |
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* The ADM1023 provides 3 extra bits of precision for |
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* the remote sensor in extra registers. |
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*/ |
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data->temp[1] += 125 * (i2c_smbus_read_byte_data( |
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client, ADM1023_REG_REM_TEMP_PREC) >> 5); |
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data->temp_max[1] += 125 * (i2c_smbus_read_byte_data( |
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client, ADM1023_REG_REM_TOS_PREC) >> 5); |
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data->temp_min[1] += 125 * (i2c_smbus_read_byte_data( |
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client, ADM1023_REG_REM_THYST_PREC) >> 5); |
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data->remote_temp_offset = |
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i2c_smbus_read_byte_data(client, |
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ADM1023_REG_REM_OFFSET); |
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data->remote_temp_offset_prec = |
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i2c_smbus_read_byte_data(client, |
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ADM1023_REG_REM_OFFSET_PREC); |
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} |
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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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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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int index = to_sensor_dev_attr(devattr)->index; |
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struct adm1021_data *data = adm1021_update_device(dev); |
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return sprintf(buf, "%d\n", data->temp[index]); |
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} |
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static ssize_t temp_max_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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int index = to_sensor_dev_attr(devattr)->index; |
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struct adm1021_data *data = adm1021_update_device(dev); |
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return sprintf(buf, "%d\n", data->temp_max[index]); |
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} |
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static ssize_t temp_min_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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int index = to_sensor_dev_attr(devattr)->index; |
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struct adm1021_data *data = adm1021_update_device(dev); |
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return sprintf(buf, "%d\n", data->temp_min[index]); |
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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 index = to_sensor_dev_attr(attr)->index; |
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struct adm1021_data *data = adm1021_update_device(dev); |
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return sprintf(buf, "%u\n", (data->alarms >> index) & 1); |
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} |
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static ssize_t alarms_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct adm1021_data *data = adm1021_update_device(dev); |
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return sprintf(buf, "%u\n", data->alarms); |
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} |
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static ssize_t temp_max_store(struct device *dev, |
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struct device_attribute *devattr, |
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const char *buf, size_t count) |
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{ |
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int index = to_sensor_dev_attr(devattr)->index; |
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struct adm1021_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 reg_val, err; |
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err = kstrtol(buf, 10, &temp); |
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if (err) |
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return err; |
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temp /= 1000; |
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mutex_lock(&data->update_lock); |
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reg_val = clamp_val(temp, -128, 127); |
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data->temp_max[index] = reg_val * 1000; |
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if (!read_only) |
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i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index), |
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reg_val); |
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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 temp_min_store(struct device *dev, |
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struct device_attribute *devattr, |
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const char *buf, size_t count) |
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{ |
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int index = to_sensor_dev_attr(devattr)->index; |
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struct adm1021_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 reg_val, err; |
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err = kstrtol(buf, 10, &temp); |
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if (err) |
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return err; |
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temp /= 1000; |
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mutex_lock(&data->update_lock); |
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reg_val = clamp_val(temp, -128, 127); |
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data->temp_min[index] = reg_val * 1000; |
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if (!read_only) |
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i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index), |
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reg_val); |
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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 low_power_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct adm1021_data *data = adm1021_update_device(dev); |
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return sprintf(buf, "%d\n", data->low_power); |
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} |
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static ssize_t low_power_store(struct device *dev, |
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struct device_attribute *devattr, |
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const char *buf, size_t count) |
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{ |
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struct adm1021_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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char low_power; |
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unsigned long val; |
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int err; |
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err = kstrtoul(buf, 10, &val); |
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if (err) |
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return err; |
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low_power = val != 0; |
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mutex_lock(&data->update_lock); |
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if (low_power != data->low_power) { |
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int config = i2c_smbus_read_byte_data( |
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client, ADM1021_REG_CONFIG_R); |
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data->low_power = low_power; |
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i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, |
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(config & 0xBF) | (low_power << 6)); |
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} |
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mutex_unlock(&data->update_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, temp_max, 0); |
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static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0); |
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6); |
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static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 5); |
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4); |
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static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3); |
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2); |
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static DEVICE_ATTR_RO(alarms); |
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static DEVICE_ATTR_RW(low_power); |
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static struct attribute *adm1021_attributes[] = { |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_temp2_max.dev_attr.attr, |
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&sensor_dev_attr_temp2_input.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_fault.dev_attr.attr, |
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&dev_attr_alarms.attr, |
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&dev_attr_low_power.attr, |
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NULL |
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}; |
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static const struct attribute_group adm1021_group = { |
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.attrs = adm1021_attributes, |
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}; |
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static struct attribute *adm1021_min_attributes[] = { |
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&sensor_dev_attr_temp1_min.dev_attr.attr, |
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&sensor_dev_attr_temp2_min.dev_attr.attr, |
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group adm1021_min_group = { |
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.attrs = adm1021_min_attributes, |
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}; |
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/* Return 0 if detection is successful, -ENODEV otherwise */ |
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static int adm1021_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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const char *type_name; |
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int conv_rate, status, config, man_id, dev_id; |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { |
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pr_debug("detect failed, smbus byte data not supported!\n"); |
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return -ENODEV; |
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} |
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status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS); |
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conv_rate = i2c_smbus_read_byte_data(client, |
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ADM1021_REG_CONV_RATE_R); |
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config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R); |
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/* Check unused bits */ |
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if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) { |
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pr_debug("detect failed, chip not detected!\n"); |
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return -ENODEV; |
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} |
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/* Determine the chip type. */ |
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man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID); |
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dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID); |
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if (man_id < 0 || dev_id < 0) |
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return -ENODEV; |
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if (man_id == 0x4d && dev_id == 0x01) |
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type_name = "max1617a"; |
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else if (man_id == 0x41) { |
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if ((dev_id & 0xF0) == 0x30) |
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type_name = "adm1023"; |
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else if ((dev_id & 0xF0) == 0x00) |
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type_name = "adm1021"; |
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else |
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return -ENODEV; |
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} else if (man_id == 0x49) |
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type_name = "thmc10"; |
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else if (man_id == 0x23) |
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type_name = "gl523sm"; |
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else if (man_id == 0x54) |
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type_name = "mc1066"; |
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else { |
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int lte, rte, lhi, rhi, llo, rlo; |
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/* extra checks for LM84 and MAX1617 to avoid misdetections */ |
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llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0)); |
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rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1)); |
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/* fail if any of the additional register reads failed */ |
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if (llo < 0 || rlo < 0) |
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return -ENODEV; |
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lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0)); |
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rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1)); |
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lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0)); |
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rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1)); |
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/* |
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* Fail for negative temperatures and negative high limits. |
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* This check also catches read errors on the tested registers. |
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*/ |
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if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0) |
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return -ENODEV; |
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/* fail if all registers hold the same value */ |
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if (lte == rte && lte == lhi && lte == rhi && lte == llo |
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&& lte == rlo) |
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return -ENODEV; |
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/* |
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* LM84 Mfr ID is in a different place, |
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* and it has more unused bits. |
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*/ |
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if (conv_rate == 0x00 |
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&& (config & 0x7F) == 0x00 |
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&& (status & 0xAB) == 0x00) { |
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type_name = "lm84"; |
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} else { |
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/* fail if low limits are larger than high limits */ |
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if ((s8)llo > lhi || (s8)rlo > rhi) |
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return -ENODEV; |
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type_name = "max1617"; |
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} |
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} |
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pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n", |
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type_name, i2c_adapter_id(adapter), client->addr); |
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strlcpy(info->type, type_name, I2C_NAME_SIZE); |
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return 0; |
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} |
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static void adm1021_init_client(struct i2c_client *client) |
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{ |
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/* Enable ADC and disable suspend mode */ |
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i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, |
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i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF); |
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/* Set Conversion rate to 1/sec (this can be tinkered with) */ |
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i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04); |
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} |
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static const struct i2c_device_id adm1021_id[]; |
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static int adm1021_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct adm1021_data *data; |
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struct device *hwmon_dev; |
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data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->client = client; |
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data->type = i2c_match_id(adm1021_id, client)->driver_data; |
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mutex_init(&data->update_lock); |
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/* Initialize the ADM1021 chip */ |
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if (data->type != lm84 && !read_only) |
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adm1021_init_client(client); |
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data->groups[0] = &adm1021_group; |
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if (data->type != lm84) |
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data->groups[1] = &adm1021_min_group; |
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
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data, data->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 adm1021_id[] = { |
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{ "adm1021", adm1021 }, |
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{ "adm1023", adm1023 }, |
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{ "max1617", max1617 }, |
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{ "max1617a", max1617a }, |
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{ "thmc10", thmc10 }, |
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{ "lm84", lm84 }, |
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{ "gl523sm", gl523sm }, |
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{ "mc1066", mc1066 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, adm1021_id); |
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static struct i2c_driver adm1021_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "adm1021", |
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}, |
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.probe_new = adm1021_probe, |
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.id_table = adm1021_id, |
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.detect = adm1021_detect, |
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.address_list = normal_i2c, |
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}; |
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module_i2c_driver(adm1021_driver); |
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MODULE_AUTHOR("Frodo Looijaard <[email protected]> and " |
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"Philip Edelbrock <[email protected]>"); |
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MODULE_DESCRIPTION("adm1021 driver"); |
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MODULE_LICENSE("GPL"); |
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module_param(read_only, bool, 0); |
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MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
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