cregit-Linux how code gets into the kernel

Release 4.14 drivers/hwmon/ibmaem.c

Directory: drivers/hwmon
/*
 * A hwmon driver for the IBM System Director Active Energy Manager (AEM)
 * temperature/power/energy sensors and capping functionality.
 * Copyright (C) 2008 IBM
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/ipmi.h>
#include <linux/module.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/kdev_t.h>
#include <linux/spinlock.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/math64.h>
#include <linux/time.h>
#include <linux/err.h>


#define REFRESH_INTERVAL	(HZ)

#define IPMI_TIMEOUT		(30 * HZ)

#define DRVNAME			"aem"


#define AEM_NETFN		0x2E


#define AEM_FIND_FW_CMD		0x80

#define AEM_ELEMENT_CMD		0x81

#define AEM_FW_INSTANCE_CMD	0x82


#define AEM_READ_ELEMENT_CFG	0x80

#define AEM_READ_BUFFER		0x81

#define AEM_READ_REGISTER	0x82

#define AEM_WRITE_REGISTER	0x83

#define AEM_SET_REG_MASK	0x84

#define AEM_CLEAR_REG_MASK	0x85

#define AEM_READ_ELEMENT_CFG2	0x86


#define AEM_CONTROL_ELEMENT	0

#define AEM_ENERGY_ELEMENT	1

#define AEM_CLOCK_ELEMENT	4

#define AEM_POWER_CAP_ELEMENT	7

#define AEM_EXHAUST_ELEMENT	9

#define AEM_POWER_ELEMENT	10


#define AEM_MODULE_TYPE_ID	0x0001


#define AEM2_NUM_ENERGY_REGS	2

#define AEM2_NUM_PCAP_REGS	6

#define AEM2_NUM_TEMP_REGS	2

#define AEM2_NUM_SENSORS	14


#define AEM1_NUM_ENERGY_REGS	1

#define AEM1_NUM_SENSORS	3

/* AEM 2.x has more energy registers */

#define AEM_NUM_ENERGY_REGS	AEM2_NUM_ENERGY_REGS
/* AEM 2.x needs more sensor files */

#define AEM_NUM_SENSORS		AEM2_NUM_SENSORS


#define POWER_CAP		0

#define POWER_CAP_MAX_HOTPLUG	1

#define POWER_CAP_MAX		2

#define	POWER_CAP_MIN_WARNING	3

#define POWER_CAP_MIN		4

#define	POWER_AUX		5


#define AEM_DEFAULT_POWER_INTERVAL 1000

#define AEM_MIN_POWER_INTERVAL	200

#define UJ_PER_MJ		1000L

static DEFINE_IDA(aem_ida);


static struct platform_driver aem_driver = {
	.driver = {
		.name = DRVNAME,
		.bus = &platform_bus_type,
        }
};


struct aem_ipmi_data {
	
struct completion	read_complete;
	
struct ipmi_addr	address;
	
ipmi_user_t		user;
	
int			interface;

	
struct kernel_ipmi_msg	tx_message;
	
long			tx_msgid;

	
void			*rx_msg_data;
	
unsigned short		rx_msg_len;
	
unsigned char		rx_result;
	
int			rx_recv_type;

	
struct device		*bmc_device;
};


struct aem_ro_sensor_template {
	
char *label;
	
ssize_t (*show)(struct device *dev,
			struct device_attribute *devattr,
			char *buf);
	
int index;
};


struct aem_rw_sensor_template {
	
char *label;
	
ssize_t (*show)(struct device *dev,
			struct device_attribute *devattr,
			char *buf);
	
ssize_t (*set)(struct device *dev,
		       struct device_attribute *devattr,
		       const char *buf, size_t count);
	
int index;
};


struct aem_data {
	
struct list_head	list;

	
struct device		*hwmon_dev;
	
struct platform_device	*pdev;
	
struct mutex		lock;
	
char			valid;
	
unsigned long		last_updated;	/* In jiffies */
	
u8			ver_major;
	
u8			ver_minor;
	
u8			module_handle;
	
int			id;
	
struct aem_ipmi_data	ipmi;

	/* Function and buffer to update sensors */
	
void (*update)(struct aem_data *data);
	
struct aem_read_sensor_resp *rs_resp;

	/*
         * AEM 1.x sensors:
         * Available sensors:
         * Energy meter
         * Power meter
         *
         * AEM 2.x sensors:
         * Two energy meters
         * Two power meters
         * Two temperature sensors
         * Six power cap registers
         */

	/* sysfs attrs */
	
struct sensor_device_attribute	sensors[AEM_NUM_SENSORS];

	/* energy use in mJ */
	
u64			energy[AEM_NUM_ENERGY_REGS];

	/* power sampling interval in ms */
	
unsigned long		power_period[AEM_NUM_ENERGY_REGS];

	/* Everything past here is for AEM2 only */

	/* power caps in dW */
	
u16			pcap[AEM2_NUM_PCAP_REGS];

	/* exhaust temperature in C */
	
u8			temp[AEM2_NUM_TEMP_REGS];
};

/* Data structures returned by the AEM firmware */

struct aem_iana_id {
	
u8			bytes[3];
};

static struct aem_iana_id system_x_id = {
	.bytes = {0x4D, 0x4F, 0x00}
};

/* These are used to find AEM1 instances */

struct aem_find_firmware_req {
	
struct aem_iana_id	id;
	
u8			rsvd;
	
__be16			index;
	
__be16			module_type_id;

} __packed;


struct aem_find_firmware_resp {
	
struct aem_iana_id	id;
	
u8			num_instances;

} __packed;

/* These are used to find AEM2 instances */

struct aem_find_instance_req {
	
struct aem_iana_id	id;
	
u8			instance_number;
	
__be16			module_type_id;

} __packed;


struct aem_find_instance_resp {
	
struct aem_iana_id	id;
	
u8			num_instances;
	
u8			major;
	
u8			minor;
	
u8			module_handle;
	
u16			record_id;

} __packed;

/* These are used to query sensors */

struct aem_read_sensor_req {
	
struct aem_iana_id	id;
	
u8			module_handle;
	
u8			element;
	
u8			subcommand;
	
u8			reg;
	
u8			rx_buf_size;

} __packed;


struct aem_read_sensor_resp {
	
struct aem_iana_id	id;
	
u8			bytes[0];

} __packed;

/* Data structures to talk to the IPMI layer */

struct aem_driver_data {
	
struct list_head	aem_devices;
	
struct ipmi_smi_watcher	bmc_events;
	
struct ipmi_user_hndl	ipmi_hndlrs;
};

static void aem_register_bmc(int iface, struct device *dev);
static void aem_bmc_gone(int iface);
static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);

static void aem_remove_sensors(struct aem_data *data);
static int aem1_find_sensors(struct aem_data *data);
static int aem2_find_sensors(struct aem_data *data);
static void update_aem1_sensors(struct aem_data *data);
static void update_aem2_sensors(struct aem_data *data);


static struct aem_driver_data driver_data = {
	.aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
	.bmc_events = {
		.owner = THIS_MODULE,
		.new_smi = aem_register_bmc,
		.smi_gone = aem_bmc_gone,
        },
	.ipmi_hndlrs = {
		.ipmi_recv_hndl = aem_msg_handler,
        },
};

/* Functions to talk to the IPMI layer */

/* Initialize IPMI address, message buffers and user data */

static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface, struct device *bmc) { int err; init_completion(&data->read_complete); data->bmc_device = bmc; /* Initialize IPMI address */ data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; data->address.channel = IPMI_BMC_CHANNEL; data->address.data[0] = 0; data->interface = iface; /* Initialize message buffers */ data->tx_msgid = 0; data->tx_message.netfn = AEM_NETFN; /* Create IPMI messaging interface user */ err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs, data, &data->user); if (err < 0) { dev_err(bmc, "Unable to register user with IPMI interface %d\n", data->interface); return err; } return 0; }

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Sachin Kamat10.76%133.33%
Total132100.00%3100.00%

/* Send an IPMI command */
static int aem_send_message(struct aem_ipmi_data *data) { int err; err = ipmi_validate_addr(&data->address, sizeof(data->address)); if (err) goto out; data->tx_msgid++; err = ipmi_request_settime(data->user, &data->address, data->tx_msgid, &data->tx_message, data, 0, 0, 0); if (err) goto out1; return 0; out1: dev_err(data->bmc_device, "request_settime=%x\n", err); return err; out: dev_err(data->bmc_device, "validate_addr=%x\n", err); return err; }

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/* Dispatch IPMI messages to callers */
static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) { unsigned short rx_len; struct aem_ipmi_data *data = user_msg_data; if (msg->msgid != data->tx_msgid) { dev_err(data->bmc_device, "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n", (int)msg->msgid, (int)data->tx_msgid); ipmi_free_recv_msg(msg); return; } data->rx_recv_type = msg->recv_type; if (msg->msg.data_len > 0) data->rx_result = msg->msg.data[0]; else data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE; if (msg->msg.data_len > 1) { rx_len = msg->msg.data_len - 1; if (data->rx_msg_len < rx_len) rx_len = data->rx_msg_len; data->rx_msg_len = rx_len; memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len); } else data->rx_msg_len = 0; ipmi_free_recv_msg(msg); complete(&data->read_complete); }

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/* Sensor support functions */ /* Read a sensor value; must be called with data->lock held */
static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg, void *buf, size_t size) { int rs_size, res; struct aem_read_sensor_req rs_req; /* Use preallocated rx buffer */ struct aem_read_sensor_resp *rs_resp = data->rs_resp; struct aem_ipmi_data *ipmi = &data->ipmi; /* AEM registers are 1, 2, 4 or 8 bytes */ switch (size) { case 1: case 2: case 4: case 8: break; default: return -EINVAL; } rs_req.id = system_x_id; rs_req.module_handle = data->module_handle; rs_req.element = elt; rs_req.subcommand = AEM_READ_REGISTER; rs_req.reg = reg; rs_req.rx_buf_size = size; ipmi->tx_message.cmd = AEM_ELEMENT_CMD; ipmi->tx_message.data = (char *)&rs_req; ipmi->tx_message.data_len = sizeof(rs_req); rs_size = sizeof(*rs_resp) + size; ipmi->rx_msg_data = rs_resp; ipmi->rx_msg_len = rs_size; aem_send_message(ipmi); res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT); if (!res) { res = -ETIMEDOUT; goto out; } if (ipmi->rx_result || ipmi->rx_msg_len != rs_size || memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) { res = -ENOENT; goto out; } switch (size) { case 1: { u8 *x = buf; *x = rs_resp->bytes[0]; break; } case 2: { u16 *x = buf; *x = be16_to_cpup((__be16 *)rs_resp->bytes); break; } case 4: { u32 *x = buf; *x = be32_to_cpup((__be32 *)rs_resp->bytes); break; } case 8: { u64 *x = buf; *x = be64_to_cpup((__be64 *)rs_resp->bytes); break; } } res = 0; out: return res; }

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Al Viro30.85%125.00%
Total355100.00%4100.00%

/* Update AEM energy registers */
static void update_aem_energy_one(struct aem_data *data, int which) { aem_read_sensor(data, AEM_ENERGY_ELEMENT, which, &data->energy[which], 8); }

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static void update_aem_energy(struct aem_data *data) { update_aem_energy_one(data, 0); if (data->ver_major < 2) return; update_aem_energy_one(data, 1); }

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/* Update all AEM1 sensors */
static void update_aem1_sensors(struct aem_data *data) { mutex_lock(&data->lock); if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && data->valid) goto out; update_aem_energy(data); out: mutex_unlock(&data->lock); }

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/* Update all AEM2 sensors */
static void update_aem2_sensors(struct aem_data *data) { int i; mutex_lock(&data->lock); if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && data->valid) goto out; update_aem_energy(data); aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1); aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1); for (i = POWER_CAP; i <= POWER_AUX; i++) aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i, &data->pcap[i], 2); out: mutex_unlock(&data->lock); }

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/* Delete an AEM instance */
static void aem_delete(struct aem_data *data) { list_del(&data->list); aem_remove_sensors(data); kfree(data->rs_resp); hwmon_device_unregister(data->hwmon_dev); ipmi_destroy_user(data->ipmi.user); platform_set_drvdata(data->pdev, NULL); platform_device_unregister(data->pdev); ida_simple_remove(&aem_ida, data->id); kfree(data); }

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Darrick J. Wong6684.62%125.00%
Jean Delvare810.26%250.00%
Jonathan Cameron45.13%125.00%
Total78100.00%4100.00%

/* Probe functions for AEM1 devices */ /* Retrieve version and module handle for an AEM1 instance */
static int aem_find_aem1_count(struct aem_ipmi_data *data) { int res; struct aem_find_firmware_req ff_req; struct aem_find_firmware_resp ff_resp; ff_req.id = system_x_id; ff_req.index = 0; ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); data->tx_message.cmd = AEM_FIND_FW_CMD; data->tx_message.data = (char *)&ff_req; data->tx_message.data_len = sizeof(ff_req); data->rx_msg_data = &ff_resp; data->rx_msg_len = sizeof(ff_resp); aem_send_message(data); res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); if (!res) return -ETIMEDOUT; if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) || memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id))) return -ENOENT; return ff_resp.num_instances; }

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/* Find and initialize one AEM1 instance */
static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle) { struct aem_data *data; int i; int res = -ENOMEM; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return res; mutex_init(&data->lock); /* Copy instance data */ data->ver_major = 1; data->ver_minor = 0; data->module_handle = module_handle; for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++) data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; /* Create sub-device for this fw instance */ data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); if (data->id < 0) goto id_err; data->pdev = platform_device_alloc(DRVNAME, data->id); if (!data->pdev) goto dev_err; data->pdev->dev.driver = &aem_driver.driver; res = platform_device_add(data->pdev); if (res) goto ipmi_err; platform_set_drvdata(data->pdev, data); /* Set up IPMI interface */ res = aem_init_ipmi_data(&data->ipmi, probe->interface, probe->bmc_device); if (res) goto ipmi_err; /* Register with hwmon */ data->hwmon_dev = hwmon_device_register(&data->pdev->dev); if (IS_ERR(data->hwmon_dev)) { dev_err(&data->pdev->dev, "Unable to register hwmon device for IPMI interface %d\n", probe->interface); res = PTR_ERR(data->hwmon_dev); goto hwmon_reg_err; } data->update = update_aem1_sensors; data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); if (!data->rs_resp) { res = -ENOMEM; goto alloc_resp_err; } /* Find sensors */ res = aem1_find_sensors(data); if (res) goto sensor_err; /* Add to our list of AEM devices */ list_add_tail(&data->list, &driver_data.aem_devices); dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", data->ver_major, data->ver_minor, data->module_handle); return 0; sensor_err: kfree(data->rs_resp); alloc_resp_err: hwmon_device_unregister(data->hwmon_dev); hwmon_reg_err: ipmi_destroy_user(data->ipmi.user); ipmi_err: platform_set_drvdata(data->pdev, NULL); platform_device_unregister(data->pdev); dev_err: ida_simple_remove(&aem_ida, data->id); id_err: kfree(data); return res; }

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Guenter Roeck10.23%114.29%
Total435100.00%7100.00%

/* Find and initialize all AEM1 instances */
static void aem_init_aem1(struct aem_ipmi_data *probe) { int num, i, err; num = aem_find_aem1_count(probe); for (i = 0; i < num; i++) { err = aem_init_aem1_inst(probe, i); if (err) { dev_err(probe->bmc_device, "Error %d initializing AEM1 0x%X\n", err, i); } } }

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/* Probe functions for AEM2 devices */ /* Retrieve version and module handle for an AEM2 instance */
static int aem_find_aem2(struct aem_ipmi_data *data, struct aem_find_instance_resp *fi_resp, int instance_num) { int res; struct aem_find_instance_req fi_req; fi_req.id = system_x_id; fi_req.instance_number = instance_num; fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); data->tx_message.cmd = AEM_FW_INSTANCE_CMD; data->tx_message.data = (char *)&fi_req; data->tx_message.data_len = sizeof(fi_req); data->rx_msg_data = fi_resp; data->rx_msg_len = sizeof(*fi_resp); aem_send_message(data); res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); if (!res) return -ETIMEDOUT; if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) || memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) || fi_resp->num_instances <= instance_num) return -ENOENT; return 0; }

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/* Find and initialize one AEM2 instance */
static int aem_init_aem2_inst(struct aem_ipmi_data *probe, struct aem_find_instance_resp *fi_resp) { struct aem_data *data; int i; int res = -ENOMEM; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return res; mutex_init(&data->lock); /* Copy instance data */ data->ver_major = fi_resp->major; data->ver_minor = fi_resp->minor; data->module_handle = fi_resp->module_handle; for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++) data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; /* Create sub-device for this fw instance */ data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); if (data->id < 0) goto id_err; data->pdev = platform_device_alloc(DRVNAME, data->id); if (!data->pdev) goto dev_err; data->pdev->dev.driver = &aem_driver.driver; res = platform_device_add(data->pdev); if (res) goto ipmi_err; platform_set_drvdata(data->pdev, data); /* Set up IPMI interface */ res = aem_init_ipmi_data(&data->ipmi, probe->interface, probe->bmc_device); if (res) goto ipmi_err; /* Register with hwmon */ data->hwmon_dev = hwmon_device_register(&data->pdev->dev); if (IS_ERR(data->hwmon_dev)) { dev_err(&data->pdev->dev, "Unable to register hwmon device for IPMI interface %d\n", probe->interface); res = PTR_ERR(data->hwmon_dev); goto hwmon_reg_err; } data->update = update_aem2_sensors; data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); if (!data->rs_resp) { res = -ENOMEM; goto alloc_resp_err; } /* Find sensors */ res = aem2_find_sensors(data); if (res) goto sensor_err; /* Add to our list of AEM devices */ list_add_tail(&data->list, &driver_data.aem_devices); dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", data->ver_major, data->ver_minor, data->module_handle); return 0; sensor_err: kfree(data->rs_resp); alloc_resp_err: hwmon_device_unregister(data->hwmon_dev); hwmon_reg_err: ipmi_destroy_user(data->ipmi.user); ipmi_err: platform_set_drvdata(data->pdev, NULL); platform_device_unregister(data->pdev); dev_err: ida_simple_remove(&aem_ida, data->id); id_err: kfree(data); return res; }

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Guenter Roeck10.23%114.29%
Total443100.00%7100.00%

/* Find and initialize all AEM2 instances */
static void aem_init_aem2(struct aem_ipmi_data *probe) { struct aem_find_instance_resp fi_resp; int err; int i = 0; while (!aem_find_aem2(probe, &fi_resp, i)) { if (fi_resp.major != 2) { dev_err(probe->bmc_device, "Unknown AEM v%d; please report this to the maintainer.\n", fi_resp.major); i++; continue; } err = aem_init_aem2_inst(probe, &fi_resp); if (err) { dev_err(probe->bmc_device, "Error %d initializing AEM2 0x%X\n", err, fi_resp.module_handle); } i++; } }

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Darrick J. Wong9797.98%133.33%
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Guenter Roeck11.01%133.33%
Total99100.00%3100.00%

/* Probe a BMC for AEM firmware instances */
static void aem_register_bmc(int iface, struct device *dev) { struct aem_ipmi_data probe; if (aem_init_ipmi_data(&probe, iface, dev)) return; /* Ignore probe errors; they won't cause problems */ aem_init_aem1(&probe); aem_init_aem2(&probe); ipmi_destroy_user(probe.user); }

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/* Handle BMC deletion */
static void aem_bmc_gone(int iface) { struct aem_data *p1, *next1; list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) if (p1->ipmi.interface == iface) aem_delete(p1); }

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Darrick J. Wong42100.00%1100.00%
Total42100.00%1100.00%

/* sysfs support functions */ /* AEM device name */
static ssize_t show_name(struct device *dev, struct device_attribute *devattr, char *buf) { struct aem_data *data = dev_get_drvdata(dev); return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major); }

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Darrick J. Wong44100.00%1100.00%
Total44100.00%1100.00%

static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); /* AEM device version */
static ssize_t show_version(struct device *dev, struct device_attribute *devattr, char *buf) { struct aem_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor); }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong46100.00%1100.00%
Total46100.00%1100.00%

static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0); /* Display power use */
static ssize_t aem_show_power(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct aem_data *data = dev_get_drvdata(dev); u64 before, after, delta, time; signed long leftover; mutex_lock(&data->lock); update_aem_energy_one(data, attr->index); time = ktime_get_ns(); before = data->energy[attr->index]; leftover = schedule_timeout_interruptible( msecs_to_jiffies(data->power_period[attr->index]) ); if (leftover) { mutex_unlock(&data->lock); return 0; } update_aem_energy_one(data, attr->index); time = ktime_get_ns() - time; after = data->energy[attr->index]; mutex_unlock(&data->lock); delta = (after - before) * UJ_PER_MJ; return sprintf(buf, "%llu\n", (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time)); }

Contributors

PersonTokensPropCommitsCommitProp
Darrick J. Wong17794.65%266.67%
Thomas Gleixner105.35%133.33%
Total187100.00%3100.00%

/* Display energy use */
static ssize_t aem_show_energy(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct aem_data *a = dev_get_drvdata(dev); mutex_lock(&a->lock); update_aem_energy_one(a, attr->index); mutex_unlock(&a->lock); return sprintf(buf, "%llu\n", (unsigned long long)a->energy[attr->index] * 1000); }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong89100.00%2100.00%
Total89100.00%2100.00%

/* Display power interval registers */
static ssize_t aem_show_power_period(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct aem_data *a = dev_get_drvdata(dev); a->update(a); return sprintf(buf, "%lu\n", a->power_period[attr->index]); }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong64100.00%1100.00%
Total64100.00%1100.00%

/* Set power interval registers */
static ssize_t aem_set_power_period(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct aem_data *a = dev_get_drvdata(dev); unsigned long temp; int res; res = kstrtoul(buf, 10, &temp); if (res) return res; if (temp < AEM_MIN_POWER_INTERVAL) return -EINVAL; mutex_lock(&a->lock); a->power_period[attr->index] = temp; mutex_unlock(&a->lock); return count; }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong10999.09%150.00%
Frans Meulenbroeks10.91%150.00%
Total110100.00%2100.00%

/* Discover sensors on an AEM device */
static int aem_register_sensors(struct aem_data *data, const struct aem_ro_sensor_template *ro, const struct aem_rw_sensor_template *rw) { struct device *dev = &data->pdev->dev; struct sensor_device_attribute *sensors = data->sensors; int err; /* Set up read-only sensors */ while (ro->label) { sysfs_attr_init(&sensors->dev_attr.attr); sensors->dev_attr.attr.name = ro->label; sensors->dev_attr.attr.mode = S_IRUGO; sensors->dev_attr.show = ro->show; sensors->index = ro->index; err = device_create_file(dev, &sensors->dev_attr); if (err) { sensors->dev_attr.attr.name = NULL; goto error; } sensors++; ro++; } /* Set up read-write sensors */ while (rw->label) { sysfs_attr_init(&sensors->dev_attr.attr); sensors->dev_attr.attr.name = rw->label; sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; sensors->dev_attr.show = rw->show; sensors->dev_attr.store = rw->set; sensors->index = rw->index; err = device_create_file(dev, &sensors->dev_attr); if (err) { sensors->dev_attr.attr.name = NULL; goto error; } sensors++; rw++; } err = device_create_file(dev, &sensor_dev_attr_name.dev_attr); if (err) goto error; err = device_create_file(dev, &sensor_dev_attr_version.dev_attr); return err; error: aem_remove_sensors(data); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Darrick J. Wong27392.54%133.33%
Guenter Roeck206.78%133.33%
Julia Lawall20.68%133.33%
Total295100.00%3100.00%

/* sysfs support functions for AEM2 sensors */ /* Display temperature use */
static ssize_t aem2_show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct aem_data *a = dev_get_drvdata(dev); a->update(a); return sprintf(buf, "%u\n", a->temp[attr->index] * 1000); }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong66100.00%1100.00%
Total66100.00%1100.00%

/* Display power-capping registers */
static ssize_t aem2_show_pcap_value(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct aem_data *a = dev_get_drvdata(dev); a->update(a); return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000); }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong66100.00%1100.00%
Total66100.00%1100.00%

/* Remove sensors attached to an AEM device */
static void aem_remove_sensors(struct aem_data *data) { int i; for (i = 0; i < AEM_NUM_SENSORS; i++) { if (!data->sensors[i].dev_attr.attr.name) continue; device_remove_file(&data->pdev->dev, &data->sensors[i].dev_attr); } device_remove_file(&data->pdev->dev, &sensor_dev_attr_name.dev_attr); device_remove_file(&data->pdev->dev, &sensor_dev_attr_version.dev_attr); }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong96100.00%1100.00%
Total96100.00%1100.00%

/* Sensor probe functions */ /* Description of AEM1 sensors */ static const struct aem_ro_sensor_template aem1_ro_sensors[] = { {"energy1_input", aem_show_energy, 0}, {"power1_average", aem_show_power, 0}, {NULL, NULL, 0}, }; static const struct aem_rw_sensor_template aem1_rw_sensors[] = { {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, {NULL, NULL, NULL, 0}, }; /* Description of AEM2 sensors */ static const struct aem_ro_sensor_template aem2_ro_sensors[] = { {"energy1_input", aem_show_energy, 0}, {"energy2_input", aem_show_energy, 1}, {"power1_average", aem_show_power, 0}, {"power2_average", aem_show_power, 1}, {"temp1_input", aem2_show_temp, 0}, {"temp2_input", aem2_show_temp, 1}, {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG}, {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX}, {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING}, {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN}, {"power3_average", aem2_show_pcap_value, POWER_AUX}, {"power_cap", aem2_show_pcap_value, POWER_CAP}, {NULL, NULL, 0}, }; static const struct aem_rw_sensor_template aem2_rw_sensors[] = { {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1}, {NULL, NULL, NULL, 0}, }; /* Set up AEM1 sensor attrs */
static int aem1_find_sensors(struct aem_data *data) { return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors); }

Contributors

PersonTokensPropCommitsCommitProp
Darrick J. Wong21100.00%1100.00%
Total21100.00%1100.00%

/* Set up AEM2 sensor attrs */
static int aem2_find_sensors(struct aem_data *data) { return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors); }

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PersonTokensPropCommitsCommitProp
Darrick J. Wong21100.00%1100.00%
Total21100.00%1100.00%

/* Module init/exit routines */
static int __init aem_init(void) { int res; res = driver_register(&aem_driver.driver); if (res) { pr_err("Can't register aem driver\n"); return res; } res = ipmi_smi_watcher_register(&driver_data.bmc_events); if (res) goto ipmi_reg_err; return 0; ipmi_reg_err: driver_unregister(&aem_driver.driver); return res; }

Contributors

PersonTokensPropCommitsCommitProp
Darrick J. Wong6898.55%266.67%
Joe Perches11.45%133.33%
Total69100.00%3100.00%


static void __exit aem_exit(void) { struct aem_data *p1, *next1; ipmi_smi_watcher_unregister(&driver_data.bmc_events); driver_unregister(&aem_driver.driver); list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) aem_delete(p1); }

Contributors

PersonTokensPropCommitsCommitProp
Darrick J. Wong48100.00%2100.00%
Total48100.00%2100.00%

MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver"); MODULE_LICENSE("GPL"); module_init(aem_init); module_exit(aem_exit); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");

Overall Contributors

PersonTokensPropCommitsCommitProp
Darrick J. Wong461693.97%833.33%
Jean Delvare1653.36%520.83%
Jonathan Cameron501.02%14.17%
Julia Lawall270.55%28.33%
Guenter Roeck250.51%28.33%
Thomas Gleixner100.20%14.17%
Joe Perches80.16%14.17%
Al Viro60.12%14.17%
Tejun Heo30.06%14.17%
Frans Meulenbroeks10.02%14.17%
Sachin Kamat10.02%14.17%
Total4912100.00%24100.00%
Directory: drivers/hwmon
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