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600 lines
14 KiB
600 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* A hwmon driver for the IBM PowerExecutive temperature/power sensors |
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* Copyright (C) 2007 IBM |
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* |
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* Author: Darrick J. Wong <[email protected]> |
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*/ |
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#include <linux/ipmi.h> |
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#include <linux/module.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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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#define REFRESH_INTERVAL (2 * HZ) |
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#define DRVNAME "ibmpex" |
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#define PEX_GET_VERSION 1 |
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#define PEX_GET_SENSOR_COUNT 2 |
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#define PEX_GET_SENSOR_NAME 3 |
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#define PEX_RESET_HIGH_LOW 4 |
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#define PEX_GET_SENSOR_DATA 6 |
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#define PEX_NET_FUNCTION 0x3A |
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#define PEX_COMMAND 0x3C |
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static inline u16 extract_value(const char *data, int offset) |
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{ |
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return be16_to_cpup((__be16 *)&data[offset]); |
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} |
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#define TEMP_SENSOR 1 |
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#define POWER_SENSOR 2 |
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#define PEX_SENSOR_TYPE_LEN 3 |
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static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72}; |
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static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D}; |
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#define PEX_MULT_LEN 2 |
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static u8 const watt_sensor_sig[] = {0x41, 0x43}; |
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#define PEX_NUM_SENSOR_FUNCS 3 |
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static const char * const sensor_name_suffixes[] = { |
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"", |
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"_lowest", |
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"_highest" |
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}; |
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static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); |
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static void ibmpex_register_bmc(int iface, struct device *dev); |
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static void ibmpex_bmc_gone(int iface); |
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struct ibmpex_sensor_data { |
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int in_use; |
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s16 values[PEX_NUM_SENSOR_FUNCS]; |
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int multiplier; |
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struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS]; |
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}; |
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struct ibmpex_bmc_data { |
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struct list_head list; |
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struct device *hwmon_dev; |
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struct device *bmc_device; |
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struct mutex lock; |
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char valid; |
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unsigned long last_updated; /* In jiffies */ |
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struct ipmi_addr address; |
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struct completion read_complete; |
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struct ipmi_user *user; |
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int interface; |
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struct kernel_ipmi_msg tx_message; |
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unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH]; |
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long tx_msgid; |
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unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH]; |
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unsigned long rx_msg_len; |
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unsigned char rx_result; |
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int rx_recv_type; |
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unsigned char sensor_major; |
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unsigned char sensor_minor; |
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unsigned char num_sensors; |
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struct ibmpex_sensor_data *sensors; |
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}; |
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struct ibmpex_driver_data { |
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struct list_head bmc_data; |
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struct ipmi_smi_watcher bmc_events; |
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struct ipmi_user_hndl ipmi_hndlrs; |
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}; |
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static struct ibmpex_driver_data driver_data = { |
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.bmc_data = LIST_HEAD_INIT(driver_data.bmc_data), |
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.bmc_events = { |
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.owner = THIS_MODULE, |
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.new_smi = ibmpex_register_bmc, |
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.smi_gone = ibmpex_bmc_gone, |
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}, |
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.ipmi_hndlrs = { |
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.ipmi_recv_hndl = ibmpex_msg_handler, |
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}, |
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}; |
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static int ibmpex_send_message(struct ibmpex_bmc_data *data) |
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{ |
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int err; |
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err = ipmi_validate_addr(&data->address, sizeof(data->address)); |
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if (err) |
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goto out; |
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data->tx_msgid++; |
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err = ipmi_request_settime(data->user, &data->address, data->tx_msgid, |
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&data->tx_message, data, 0, 0, 0); |
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if (err) |
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goto out1; |
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return 0; |
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out1: |
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dev_err(data->bmc_device, "request_settime=%x\n", err); |
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return err; |
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out: |
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dev_err(data->bmc_device, "validate_addr=%x\n", err); |
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return err; |
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} |
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static int ibmpex_ver_check(struct ibmpex_bmc_data *data) |
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{ |
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data->tx_msg_data[0] = PEX_GET_VERSION; |
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data->tx_message.data_len = 1; |
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ibmpex_send_message(data); |
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wait_for_completion(&data->read_complete); |
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if (data->rx_result || data->rx_msg_len != 6) |
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return -ENOENT; |
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data->sensor_major = data->rx_msg_data[0]; |
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data->sensor_minor = data->rx_msg_data[1]; |
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dev_info(data->bmc_device, |
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"Found BMC with sensor interface v%d.%d %d-%02d-%02d on interface %d\n", |
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data->sensor_major, |
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data->sensor_minor, |
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extract_value(data->rx_msg_data, 2), |
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data->rx_msg_data[4], |
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data->rx_msg_data[5], |
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data->interface); |
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return 0; |
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} |
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static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data) |
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{ |
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data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT; |
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data->tx_message.data_len = 1; |
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ibmpex_send_message(data); |
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wait_for_completion(&data->read_complete); |
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if (data->rx_result || data->rx_msg_len != 1) |
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return -ENOENT; |
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return data->rx_msg_data[0]; |
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} |
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static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor) |
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{ |
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data->tx_msg_data[0] = PEX_GET_SENSOR_NAME; |
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data->tx_msg_data[1] = sensor; |
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data->tx_message.data_len = 2; |
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ibmpex_send_message(data); |
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wait_for_completion(&data->read_complete); |
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if (data->rx_result || data->rx_msg_len < 1) |
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return -ENOENT; |
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return 0; |
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} |
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static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor) |
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{ |
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data->tx_msg_data[0] = PEX_GET_SENSOR_DATA; |
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data->tx_msg_data[1] = sensor; |
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data->tx_message.data_len = 2; |
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ibmpex_send_message(data); |
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wait_for_completion(&data->read_complete); |
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if (data->rx_result || data->rx_msg_len < 26) { |
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dev_err(data->bmc_device, "Error reading sensor %d.\n", |
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sensor); |
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return -ENOENT; |
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} |
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return 0; |
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} |
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static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data) |
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{ |
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data->tx_msg_data[0] = PEX_RESET_HIGH_LOW; |
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data->tx_message.data_len = 1; |
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ibmpex_send_message(data); |
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wait_for_completion(&data->read_complete); |
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return 0; |
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} |
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static void ibmpex_update_device(struct ibmpex_bmc_data *data) |
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{ |
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int i, err; |
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mutex_lock(&data->lock); |
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if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && |
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data->valid) |
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goto out; |
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for (i = 0; i < data->num_sensors; i++) { |
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if (!data->sensors[i].in_use) |
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continue; |
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err = ibmpex_query_sensor_data(data, i); |
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if (err) |
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continue; |
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data->sensors[i].values[0] = |
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extract_value(data->rx_msg_data, 16); |
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data->sensors[i].values[1] = |
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extract_value(data->rx_msg_data, 18); |
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data->sensors[i].values[2] = |
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extract_value(data->rx_msg_data, 20); |
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} |
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data->last_updated = jiffies; |
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data->valid = 1; |
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out: |
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mutex_unlock(&data->lock); |
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} |
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static struct ibmpex_bmc_data *get_bmc_data(int iface) |
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{ |
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struct ibmpex_bmc_data *p, *next; |
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list_for_each_entry_safe(p, next, &driver_data.bmc_data, list) |
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if (p->interface == iface) |
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return p; |
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return NULL; |
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} |
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static ssize_t name_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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return sprintf(buf, "%s\n", DRVNAME); |
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} |
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static SENSOR_DEVICE_ATTR_RO(name, name, 0); |
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static ssize_t ibmpex_show_sensor(struct device *dev, |
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struct device_attribute *devattr, |
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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(devattr); |
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struct ibmpex_bmc_data *data = dev_get_drvdata(dev); |
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int mult = data->sensors[attr->index].multiplier; |
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ibmpex_update_device(data); |
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return sprintf(buf, "%d\n", |
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data->sensors[attr->index].values[attr->nr] * mult); |
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} |
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static ssize_t ibmpex_high_low_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 ibmpex_bmc_data *data = dev_get_drvdata(dev); |
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ibmpex_reset_high_low_data(data); |
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return count; |
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} |
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static SENSOR_DEVICE_ATTR_WO(reset_high_low, ibmpex_high_low, 0); |
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static int is_power_sensor(const char *sensor_id, int len) |
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{ |
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if (len < PEX_SENSOR_TYPE_LEN) |
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return 0; |
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if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN)) |
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return 1; |
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return 0; |
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} |
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static int is_temp_sensor(const char *sensor_id, int len) |
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{ |
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if (len < PEX_SENSOR_TYPE_LEN) |
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return 0; |
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if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN)) |
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return 1; |
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return 0; |
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} |
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static int power_sensor_multiplier(struct ibmpex_bmc_data *data, |
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const char *sensor_id, int len) |
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{ |
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int i; |
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if (data->sensor_major == 2) |
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return 1000000; |
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for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++) |
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if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN)) |
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return 1000000; |
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return 100000; |
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} |
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static int create_sensor(struct ibmpex_bmc_data *data, int type, |
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int counter, int sensor, int func) |
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{ |
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int err; |
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char *n; |
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n = kmalloc(32, GFP_KERNEL); |
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if (!n) |
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return -ENOMEM; |
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if (type == TEMP_SENSOR) |
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sprintf(n, "temp%d_input%s", |
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counter, sensor_name_suffixes[func]); |
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else if (type == POWER_SENSOR) |
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sprintf(n, "power%d_average%s", |
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counter, sensor_name_suffixes[func]); |
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sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr); |
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data->sensors[sensor].attr[func].dev_attr.attr.name = n; |
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data->sensors[sensor].attr[func].dev_attr.attr.mode = 0444; |
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data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor; |
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data->sensors[sensor].attr[func].index = sensor; |
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data->sensors[sensor].attr[func].nr = func; |
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err = device_create_file(data->bmc_device, |
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&data->sensors[sensor].attr[func].dev_attr); |
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if (err) { |
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data->sensors[sensor].attr[func].dev_attr.attr.name = NULL; |
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kfree(n); |
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return err; |
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} |
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return 0; |
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} |
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static int ibmpex_find_sensors(struct ibmpex_bmc_data *data) |
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{ |
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int i, j, err; |
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int sensor_type; |
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int sensor_counter; |
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int num_power = 0; |
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int num_temp = 0; |
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err = ibmpex_query_sensor_count(data); |
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if (err <= 0) |
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return -ENOENT; |
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data->num_sensors = err; |
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data->sensors = kcalloc(data->num_sensors, sizeof(*data->sensors), |
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GFP_KERNEL); |
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if (!data->sensors) |
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return -ENOMEM; |
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for (i = 0; i < data->num_sensors; i++) { |
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err = ibmpex_query_sensor_name(data, i); |
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if (err) |
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continue; |
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if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) { |
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sensor_type = POWER_SENSOR; |
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num_power++; |
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sensor_counter = num_power; |
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data->sensors[i].multiplier = |
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power_sensor_multiplier(data, |
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data->rx_msg_data, |
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data->rx_msg_len); |
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} else if (is_temp_sensor(data->rx_msg_data, |
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data->rx_msg_len)) { |
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sensor_type = TEMP_SENSOR; |
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num_temp++; |
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sensor_counter = num_temp; |
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data->sensors[i].multiplier = 1000; |
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} else |
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continue; |
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data->sensors[i].in_use = 1; |
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/* Create attributes */ |
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for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) { |
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err = create_sensor(data, sensor_type, sensor_counter, |
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i, j); |
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if (err) |
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goto exit_remove; |
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} |
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} |
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err = device_create_file(data->bmc_device, |
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&sensor_dev_attr_reset_high_low.dev_attr); |
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if (err) |
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goto exit_remove; |
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err = device_create_file(data->bmc_device, |
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&sensor_dev_attr_name.dev_attr); |
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if (err) |
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goto exit_remove; |
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return 0; |
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exit_remove: |
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device_remove_file(data->bmc_device, |
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&sensor_dev_attr_reset_high_low.dev_attr); |
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device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr); |
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for (i = 0; i < data->num_sensors; i++) |
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for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) { |
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if (!data->sensors[i].attr[j].dev_attr.attr.name) |
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continue; |
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device_remove_file(data->bmc_device, |
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&data->sensors[i].attr[j].dev_attr); |
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kfree(data->sensors[i].attr[j].dev_attr.attr.name); |
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} |
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kfree(data->sensors); |
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return err; |
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} |
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static void ibmpex_register_bmc(int iface, struct device *dev) |
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{ |
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struct ibmpex_bmc_data *data; |
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int err; |
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data = kzalloc(sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return; |
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data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
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data->address.channel = IPMI_BMC_CHANNEL; |
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data->address.data[0] = 0; |
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data->interface = iface; |
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data->bmc_device = dev; |
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/* Create IPMI messaging interface user */ |
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err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs, |
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data, &data->user); |
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if (err < 0) { |
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dev_err(dev, |
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"Unable to register user with IPMI interface %d\n", |
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data->interface); |
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goto out; |
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} |
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mutex_init(&data->lock); |
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/* Initialize message */ |
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data->tx_msgid = 0; |
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init_completion(&data->read_complete); |
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data->tx_message.netfn = PEX_NET_FUNCTION; |
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data->tx_message.cmd = PEX_COMMAND; |
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data->tx_message.data = data->tx_msg_data; |
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/* Does this BMC support PowerExecutive? */ |
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err = ibmpex_ver_check(data); |
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if (err) |
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goto out_user; |
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/* Register the BMC as a HWMON class device */ |
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data->hwmon_dev = hwmon_device_register(data->bmc_device); |
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if (IS_ERR(data->hwmon_dev)) { |
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dev_err(data->bmc_device, |
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"Unable to register hwmon device for IPMI interface %d\n", |
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data->interface); |
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goto out_user; |
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} |
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/* finally add the new bmc data to the bmc data list */ |
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dev_set_drvdata(dev, data); |
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list_add_tail(&data->list, &driver_data.bmc_data); |
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/* Now go find all the sensors */ |
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err = ibmpex_find_sensors(data); |
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if (err) { |
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dev_err(data->bmc_device, "Error %d finding sensors\n", err); |
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goto out_register; |
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} |
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return; |
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out_register: |
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hwmon_device_unregister(data->hwmon_dev); |
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out_user: |
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ipmi_destroy_user(data->user); |
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out: |
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kfree(data); |
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} |
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static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data) |
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{ |
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int i, j; |
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device_remove_file(data->bmc_device, |
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&sensor_dev_attr_reset_high_low.dev_attr); |
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device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr); |
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for (i = 0; i < data->num_sensors; i++) |
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for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) { |
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if (!data->sensors[i].attr[j].dev_attr.attr.name) |
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continue; |
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device_remove_file(data->bmc_device, |
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&data->sensors[i].attr[j].dev_attr); |
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kfree(data->sensors[i].attr[j].dev_attr.attr.name); |
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} |
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list_del(&data->list); |
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dev_set_drvdata(data->bmc_device, NULL); |
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hwmon_device_unregister(data->hwmon_dev); |
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ipmi_destroy_user(data->user); |
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kfree(data->sensors); |
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kfree(data); |
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} |
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static void ibmpex_bmc_gone(int iface) |
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{ |
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struct ibmpex_bmc_data *data = get_bmc_data(iface); |
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if (!data) |
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return; |
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ibmpex_bmc_delete(data); |
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} |
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static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) |
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{ |
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struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data; |
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if (msg->msgid != data->tx_msgid) { |
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dev_err(data->bmc_device, |
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"Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n", |
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(int)msg->msgid, |
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(int)data->tx_msgid); |
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ipmi_free_recv_msg(msg); |
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return; |
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} |
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data->rx_recv_type = msg->recv_type; |
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if (msg->msg.data_len > 0) |
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data->rx_result = msg->msg.data[0]; |
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else |
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data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE; |
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|
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if (msg->msg.data_len > 1) { |
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data->rx_msg_len = msg->msg.data_len - 1; |
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memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len); |
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} else |
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data->rx_msg_len = 0; |
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|
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ipmi_free_recv_msg(msg); |
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complete(&data->read_complete); |
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} |
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static int __init ibmpex_init(void) |
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{ |
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return ipmi_smi_watcher_register(&driver_data.bmc_events); |
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} |
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static void __exit ibmpex_exit(void) |
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{ |
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struct ibmpex_bmc_data *p, *next; |
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ipmi_smi_watcher_unregister(&driver_data.bmc_events); |
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list_for_each_entry_safe(p, next, &driver_data.bmc_data, list) |
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ibmpex_bmc_delete(p); |
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} |
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MODULE_AUTHOR("Darrick J. Wong <[email protected]>"); |
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MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver"); |
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MODULE_LICENSE("GPL"); |
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module_init(ibmpex_init); |
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module_exit(ibmpex_exit); |
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MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); |
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MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); |
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MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); |
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MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); |
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MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
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