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522 lines
14 KiB
522 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for Lineage Compact Power Line series of power entry modules. |
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* |
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* Copyright (C) 2010, 2011 Ericsson AB. |
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* |
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* Documentation: |
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* http://www.lineagepower.com/oem/pdf/CPLI2C.pdf |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#include <linux/slab.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/jiffies.h> |
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|
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/* |
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* This driver supports various Lineage Compact Power Line DC/DC and AC/DC |
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* converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others. |
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* |
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* The devices are nominally PMBus compliant. However, most standard PMBus |
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* commands are not supported. Specifically, all hardware monitoring and |
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* status reporting commands are non-standard. For this reason, a standard |
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* PMBus driver can not be used. |
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* |
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* All Lineage CPL devices have a built-in I2C bus master selector (PCA9541). |
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* To ensure device access, this driver should only be used as client driver |
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* to the pca9541 I2C master selector driver. |
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*/ |
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|
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/* Command codes */ |
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#define PEM_OPERATION 0x01 |
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#define PEM_CLEAR_INFO_FLAGS 0x03 |
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#define PEM_VOUT_COMMAND 0x21 |
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#define PEM_VOUT_OV_FAULT_LIMIT 0x40 |
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#define PEM_READ_DATA_STRING 0xd0 |
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#define PEM_READ_INPUT_STRING 0xdc |
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#define PEM_READ_FIRMWARE_REV 0xdd |
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#define PEM_READ_RUN_TIMER 0xde |
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#define PEM_FAN_HI_SPEED 0xdf |
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#define PEM_FAN_NORMAL_SPEED 0xe0 |
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#define PEM_READ_FAN_SPEED 0xe1 |
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|
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/* offsets in data string */ |
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#define PEM_DATA_STATUS_2 0 |
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#define PEM_DATA_STATUS_1 1 |
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#define PEM_DATA_ALARM_2 2 |
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#define PEM_DATA_ALARM_1 3 |
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#define PEM_DATA_VOUT_LSB 4 |
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#define PEM_DATA_VOUT_MSB 5 |
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#define PEM_DATA_CURRENT 6 |
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#define PEM_DATA_TEMP 7 |
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/* Virtual entries, to report constants */ |
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#define PEM_DATA_TEMP_MAX 10 |
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#define PEM_DATA_TEMP_CRIT 11 |
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/* offsets in input string */ |
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#define PEM_INPUT_VOLTAGE 0 |
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#define PEM_INPUT_POWER_LSB 1 |
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#define PEM_INPUT_POWER_MSB 2 |
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/* offsets in fan data */ |
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#define PEM_FAN_ADJUSTMENT 0 |
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#define PEM_FAN_FAN1 1 |
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#define PEM_FAN_FAN2 2 |
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#define PEM_FAN_FAN3 3 |
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|
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/* Status register bits */ |
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#define STS1_OUTPUT_ON (1 << 0) |
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#define STS1_LEDS_FLASHING (1 << 1) |
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#define STS1_EXT_FAULT (1 << 2) |
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#define STS1_SERVICE_LED_ON (1 << 3) |
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#define STS1_SHUTDOWN_OCCURRED (1 << 4) |
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#define STS1_INT_FAULT (1 << 5) |
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#define STS1_ISOLATION_TEST_OK (1 << 6) |
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#define STS2_ENABLE_PIN_HI (1 << 0) |
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#define STS2_DATA_OUT_RANGE (1 << 1) |
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#define STS2_RESTARTED_OK (1 << 1) |
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#define STS2_ISOLATION_TEST_FAIL (1 << 3) |
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#define STS2_HIGH_POWER_CAP (1 << 4) |
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#define STS2_INVALID_INSTR (1 << 5) |
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#define STS2_WILL_RESTART (1 << 6) |
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#define STS2_PEC_ERR (1 << 7) |
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|
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/* Alarm register bits */ |
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#define ALRM1_VIN_OUT_LIMIT (1 << 0) |
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#define ALRM1_VOUT_OUT_LIMIT (1 << 1) |
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#define ALRM1_OV_VOLT_SHUTDOWN (1 << 2) |
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#define ALRM1_VIN_OVERCURRENT (1 << 3) |
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#define ALRM1_TEMP_WARNING (1 << 4) |
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#define ALRM1_TEMP_SHUTDOWN (1 << 5) |
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#define ALRM1_PRIMARY_FAULT (1 << 6) |
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#define ALRM1_POWER_LIMIT (1 << 7) |
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#define ALRM2_5V_OUT_LIMIT (1 << 1) |
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#define ALRM2_TEMP_FAULT (1 << 2) |
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#define ALRM2_OV_LOW (1 << 3) |
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#define ALRM2_DCDC_TEMP_HIGH (1 << 4) |
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#define ALRM2_PRI_TEMP_HIGH (1 << 5) |
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#define ALRM2_NO_PRIMARY (1 << 6) |
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#define ALRM2_FAN_FAULT (1 << 7) |
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#define FIRMWARE_REV_LEN 4 |
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#define DATA_STRING_LEN 9 |
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#define INPUT_STRING_LEN 5 /* 4 for most devices */ |
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#define FAN_SPEED_LEN 5 |
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struct pem_data { |
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struct i2c_client *client; |
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const struct attribute_group *groups[4]; |
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struct mutex update_lock; |
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bool valid; |
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bool fans_supported; |
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int input_length; |
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unsigned long last_updated; /* in jiffies */ |
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u8 firmware_rev[FIRMWARE_REV_LEN]; |
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u8 data_string[DATA_STRING_LEN]; |
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u8 input_string[INPUT_STRING_LEN]; |
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u8 fan_speed[FAN_SPEED_LEN]; |
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}; |
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static int pem_read_block(struct i2c_client *client, u8 command, u8 *data, |
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int data_len) |
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{ |
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u8 block_buffer[I2C_SMBUS_BLOCK_MAX]; |
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int result; |
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result = i2c_smbus_read_block_data(client, command, block_buffer); |
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if (unlikely(result < 0)) |
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goto abort; |
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if (unlikely(result == 0xff || result != data_len)) { |
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result = -EIO; |
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goto abort; |
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} |
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memcpy(data, block_buffer, data_len); |
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result = 0; |
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abort: |
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return result; |
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} |
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static struct pem_data *pem_update_device(struct device *dev) |
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{ |
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struct pem_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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struct pem_data *ret = data; |
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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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int result; |
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/* Read data string */ |
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result = pem_read_block(client, PEM_READ_DATA_STRING, |
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data->data_string, |
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sizeof(data->data_string)); |
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if (unlikely(result < 0)) { |
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ret = ERR_PTR(result); |
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goto abort; |
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} |
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/* Read input string */ |
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if (data->input_length) { |
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result = pem_read_block(client, PEM_READ_INPUT_STRING, |
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data->input_string, |
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data->input_length); |
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if (unlikely(result < 0)) { |
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ret = ERR_PTR(result); |
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goto abort; |
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} |
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} |
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/* Read fan speeds */ |
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if (data->fans_supported) { |
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result = pem_read_block(client, PEM_READ_FAN_SPEED, |
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data->fan_speed, |
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sizeof(data->fan_speed)); |
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if (unlikely(result < 0)) { |
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ret = ERR_PTR(result); |
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goto abort; |
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} |
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} |
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i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); |
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data->last_updated = jiffies; |
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data->valid = true; |
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} |
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abort: |
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mutex_unlock(&data->update_lock); |
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return ret; |
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} |
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static long pem_get_data(u8 *data, int len, int index) |
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{ |
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long val; |
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switch (index) { |
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case PEM_DATA_VOUT_LSB: |
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val = (data[index] + (data[index+1] << 8)) * 5 / 2; |
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break; |
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case PEM_DATA_CURRENT: |
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val = data[index] * 200; |
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break; |
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case PEM_DATA_TEMP: |
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val = data[index] * 1000; |
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break; |
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case PEM_DATA_TEMP_MAX: |
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val = 97 * 1000; /* 97 degrees C per datasheet */ |
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break; |
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case PEM_DATA_TEMP_CRIT: |
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val = 107 * 1000; /* 107 degrees C per datasheet */ |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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val = 0; |
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} |
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return val; |
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} |
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static long pem_get_input(u8 *data, int len, int index) |
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{ |
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long val; |
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switch (index) { |
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case PEM_INPUT_VOLTAGE: |
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if (len == INPUT_STRING_LEN) |
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val = (data[index] + (data[index+1] << 8) - 75) * 1000; |
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else |
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val = (data[index] - 75) * 1000; |
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break; |
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case PEM_INPUT_POWER_LSB: |
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if (len == INPUT_STRING_LEN) |
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index++; |
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val = (data[index] + (data[index+1] << 8)) * 1000000L; |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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val = 0; |
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} |
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return val; |
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} |
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static long pem_get_fan(u8 *data, int len, int index) |
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{ |
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long val; |
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switch (index) { |
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case PEM_FAN_FAN1: |
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case PEM_FAN_FAN2: |
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case PEM_FAN_FAN3: |
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val = data[index] * 100; |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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val = 0; |
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} |
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return val; |
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} |
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/* |
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* Show boolean, either a fault or an alarm. |
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* .nr points to the register, .index is the bit mask to check |
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*/ |
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static ssize_t pem_bool_show(struct device *dev, struct device_attribute *da, |
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char *buf) |
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{ |
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struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da); |
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struct pem_data *data = pem_update_device(dev); |
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u8 status; |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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status = data->data_string[attr->nr] & attr->index; |
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return sysfs_emit(buf, "%d\n", !!status); |
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} |
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static ssize_t pem_data_show(struct device *dev, struct device_attribute *da, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct pem_data *data = pem_update_device(dev); |
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long value; |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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value = pem_get_data(data->data_string, sizeof(data->data_string), |
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attr->index); |
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return sysfs_emit(buf, "%ld\n", value); |
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} |
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static ssize_t pem_input_show(struct device *dev, struct device_attribute *da, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct pem_data *data = pem_update_device(dev); |
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long value; |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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value = pem_get_input(data->input_string, sizeof(data->input_string), |
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attr->index); |
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return sysfs_emit(buf, "%ld\n", value); |
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} |
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static ssize_t pem_fan_show(struct device *dev, struct device_attribute *da, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct pem_data *data = pem_update_device(dev); |
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long value; |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed), |
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attr->index); |
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return sysfs_emit(buf, "%ld\n", value); |
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} |
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/* Voltages */ |
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static SENSOR_DEVICE_ATTR_RO(in1_input, pem_data, PEM_DATA_VOUT_LSB); |
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static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, pem_bool, PEM_DATA_ALARM_1, |
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ALRM1_VOUT_OUT_LIMIT); |
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static SENSOR_DEVICE_ATTR_2_RO(in1_crit_alarm, pem_bool, PEM_DATA_ALARM_1, |
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ALRM1_OV_VOLT_SHUTDOWN); |
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static SENSOR_DEVICE_ATTR_RO(in2_input, pem_input, PEM_INPUT_VOLTAGE); |
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static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, pem_bool, PEM_DATA_ALARM_1, |
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ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT); |
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/* Currents */ |
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static SENSOR_DEVICE_ATTR_RO(curr1_input, pem_data, PEM_DATA_CURRENT); |
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static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, pem_bool, PEM_DATA_ALARM_1, |
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ALRM1_VIN_OVERCURRENT); |
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/* Power */ |
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static SENSOR_DEVICE_ATTR_RO(power1_input, pem_input, PEM_INPUT_POWER_LSB); |
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static SENSOR_DEVICE_ATTR_2_RO(power1_alarm, pem_bool, PEM_DATA_ALARM_1, |
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ALRM1_POWER_LIMIT); |
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/* Fans */ |
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static SENSOR_DEVICE_ATTR_RO(fan1_input, pem_fan, PEM_FAN_FAN1); |
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static SENSOR_DEVICE_ATTR_RO(fan2_input, pem_fan, PEM_FAN_FAN2); |
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static SENSOR_DEVICE_ATTR_RO(fan3_input, pem_fan, PEM_FAN_FAN3); |
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static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, pem_bool, PEM_DATA_ALARM_2, |
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ALRM2_FAN_FAULT); |
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/* Temperatures */ |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, pem_data, PEM_DATA_TEMP); |
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static SENSOR_DEVICE_ATTR_RO(temp1_max, pem_data, PEM_DATA_TEMP_MAX); |
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static SENSOR_DEVICE_ATTR_RO(temp1_crit, pem_data, PEM_DATA_TEMP_CRIT); |
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static SENSOR_DEVICE_ATTR_2_RO(temp1_alarm, pem_bool, PEM_DATA_ALARM_1, |
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ALRM1_TEMP_WARNING); |
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static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, pem_bool, PEM_DATA_ALARM_1, |
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ALRM1_TEMP_SHUTDOWN); |
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static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, pem_bool, PEM_DATA_ALARM_2, |
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ALRM2_TEMP_FAULT); |
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static struct attribute *pem_attributes[] = { |
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&sensor_dev_attr_in1_input.dev_attr.attr, |
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&sensor_dev_attr_in1_alarm.dev_attr.attr, |
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&sensor_dev_attr_in1_crit_alarm.dev_attr.attr, |
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&sensor_dev_attr_in2_alarm.dev_attr.attr, |
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&sensor_dev_attr_curr1_alarm.dev_attr.attr, |
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&sensor_dev_attr_power1_alarm.dev_attr.attr, |
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&sensor_dev_attr_fan1_alarm.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_crit.dev_attr.attr, |
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&sensor_dev_attr_temp1_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp1_fault.dev_attr.attr, |
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NULL, |
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}; |
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static const struct attribute_group pem_group = { |
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.attrs = pem_attributes, |
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}; |
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static struct attribute *pem_input_attributes[] = { |
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&sensor_dev_attr_in2_input.dev_attr.attr, |
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&sensor_dev_attr_curr1_input.dev_attr.attr, |
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&sensor_dev_attr_power1_input.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group pem_input_group = { |
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.attrs = pem_input_attributes, |
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}; |
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static struct attribute *pem_fan_attributes[] = { |
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&sensor_dev_attr_fan1_input.dev_attr.attr, |
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&sensor_dev_attr_fan2_input.dev_attr.attr, |
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&sensor_dev_attr_fan3_input.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group pem_fan_group = { |
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.attrs = pem_fan_attributes, |
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}; |
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static int pem_probe(struct i2c_client *client) |
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{ |
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struct i2c_adapter *adapter = client->adapter; |
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struct device *dev = &client->dev; |
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struct device *hwmon_dev; |
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struct pem_data *data; |
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int ret, idx = 0; |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA |
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| I2C_FUNC_SMBUS_WRITE_BYTE)) |
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return -ENODEV; |
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data = devm_kzalloc(dev, sizeof(*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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mutex_init(&data->update_lock); |
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/* |
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* We use the next two commands to determine if the device is really |
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* there. |
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*/ |
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ret = pem_read_block(client, PEM_READ_FIRMWARE_REV, |
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data->firmware_rev, sizeof(data->firmware_rev)); |
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if (ret < 0) |
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return ret; |
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ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); |
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if (ret < 0) |
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return ret; |
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dev_info(dev, "Firmware revision %d.%d.%d\n", |
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data->firmware_rev[0], data->firmware_rev[1], |
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data->firmware_rev[2]); |
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/* sysfs hooks */ |
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data->groups[idx++] = &pem_group; |
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|
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/* |
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* Check if input readings are supported. |
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* This is the case if we can read input data, |
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* and if the returned data is not all zeros. |
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* Note that input alarms are always supported. |
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*/ |
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ret = pem_read_block(client, PEM_READ_INPUT_STRING, |
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data->input_string, |
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sizeof(data->input_string) - 1); |
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if (!ret && (data->input_string[0] || data->input_string[1] || |
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data->input_string[2])) |
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data->input_length = sizeof(data->input_string) - 1; |
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else if (ret < 0) { |
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/* Input string is one byte longer for some devices */ |
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ret = pem_read_block(client, PEM_READ_INPUT_STRING, |
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data->input_string, |
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sizeof(data->input_string)); |
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if (!ret && (data->input_string[0] || data->input_string[1] || |
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data->input_string[2] || data->input_string[3])) |
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data->input_length = sizeof(data->input_string); |
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} |
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if (data->input_length) |
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data->groups[idx++] = &pem_input_group; |
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|
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/* |
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* Check if fan speed readings are supported. |
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* This is the case if we can read fan speed data, |
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* and if the returned data is not all zeros. |
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* Note that the fan alarm is always supported. |
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*/ |
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ret = pem_read_block(client, PEM_READ_FAN_SPEED, |
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data->fan_speed, |
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sizeof(data->fan_speed)); |
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if (!ret && (data->fan_speed[0] || data->fan_speed[1] || |
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data->fan_speed[2] || data->fan_speed[3])) { |
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data->fans_supported = true; |
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data->groups[idx++] = &pem_fan_group; |
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} |
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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 pem_id[] = { |
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{"lineage_pem", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, pem_id); |
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|
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static struct i2c_driver pem_driver = { |
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.driver = { |
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.name = "lineage_pem", |
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}, |
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.probe_new = pem_probe, |
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.id_table = pem_id, |
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}; |
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module_i2c_driver(pem_driver); |
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|
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MODULE_AUTHOR("Guenter Roeck <[email protected]>"); |
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MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver"); |
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MODULE_LICENSE("GPL");
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