[linux-2.6-block.git] / drivers / hwmon / ibmpex.c

/*
 * A hwmon driver for the IBM PowerExecutive temperature/power sensors
 * Copyright (C) 2007 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
 */

#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/slab.h>
#include <linux/err.h>

#define REFRESH_INTERVAL	(2 * HZ)
#define DRVNAME			"ibmpex"

#define PEX_GET_VERSION		1
#define PEX_GET_SENSOR_COUNT	2
#define PEX_GET_SENSOR_NAME	3
#define PEX_RESET_HIGH_LOW	4
#define PEX_GET_SENSOR_DATA	6

#define PEX_NET_FUNCTION	0x3A
#define PEX_COMMAND		0x3C

static inline u16 extract_value(const char *data, int offset)
{
	return be16_to_cpup((__be16 *)&data[offset]);
}

#define TEMP_SENSOR		1
#define POWER_SENSOR		2

#define PEX_SENSOR_TYPE_LEN	3
static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
static u8 const temp_sensor_sig[]  = {0x74, 0x65, 0x6D};

#define PEX_MULT_LEN		2
static u8 const watt_sensor_sig[]  = {0x41, 0x43};

#define PEX_NUM_SENSOR_FUNCS	3
static const char * const sensor_name_suffixes[] = {
	"",
	"_lowest",
	"_highest"
};

static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
static void ibmpex_register_bmc(int iface, struct device *dev);
static void ibmpex_bmc_gone(int iface);

struct ibmpex_sensor_data {
	int			in_use;
	s16			values[PEX_NUM_SENSOR_FUNCS];
	int			multiplier;

	struct sensor_device_attribute_2	attr[PEX_NUM_SENSOR_FUNCS];
};

struct ibmpex_bmc_data {
	struct list_head	list;
	struct device		*hwmon_dev;
	struct device		*bmc_device;
	struct mutex		lock;
	char			valid;
	unsigned long		last_updated;	/* In jiffies */

	struct ipmi_addr	address;
	struct completion	read_complete;
	struct ipmi_user	*user;
	int			interface;

	struct kernel_ipmi_msg	tx_message;
	unsigned char		tx_msg_data[IPMI_MAX_MSG_LENGTH];
	long			tx_msgid;

	unsigned char		rx_msg_data[IPMI_MAX_MSG_LENGTH];
	unsigned long		rx_msg_len;
	unsigned char		rx_result;
	int			rx_recv_type;

	unsigned char		sensor_major;
	unsigned char		sensor_minor;

	unsigned char		num_sensors;
	struct ibmpex_sensor_data	*sensors;
};

struct ibmpex_driver_data {
	struct list_head	bmc_data;
	struct ipmi_smi_watcher	bmc_events;
	struct ipmi_user_hndl	ipmi_hndlrs;
};

static struct ibmpex_driver_data driver_data = {
	.bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
	.bmc_events = {
		.owner = THIS_MODULE,
		.new_smi = ibmpex_register_bmc,
		.smi_gone = ibmpex_bmc_gone,
	},
	.ipmi_hndlrs = {
		.ipmi_recv_hndl = ibmpex_msg_handler,
	},
};

static int ibmpex_send_message(struct ibmpex_bmc_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;
}

static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
{
	data->tx_msg_data[0] = PEX_GET_VERSION;
	data->tx_message.data_len = 1;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len != 6)
		return -ENOENT;

	data->sensor_major = data->rx_msg_data[0];
	data->sensor_minor = data->rx_msg_data[1];

	dev_info(data->bmc_device,
		 "Found BMC with sensor interface v%d.%d %d-%02d-%02d on interface %d\n",
		 data->sensor_major,
		 data->sensor_minor,
		 extract_value(data->rx_msg_data, 2),
		 data->rx_msg_data[4],
		 data->rx_msg_data[5],
		 data->interface);

	return 0;
}

static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
{
	data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
	data->tx_message.data_len = 1;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len != 1)
		return -ENOENT;

	return data->rx_msg_data[0];
}

static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
{
	data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
	data->tx_msg_data[1] = sensor;
	data->tx_message.data_len = 2;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len < 1)
		return -ENOENT;

	return 0;
}

static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
{
	data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
	data->tx_msg_data[1] = sensor;
	data->tx_message.data_len = 2;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len < 26) {
		dev_err(data->bmc_device, "Error reading sensor %d.\n",
			sensor);
		return -ENOENT;
	}

	return 0;
}

static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
{
	data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
	data->tx_message.data_len = 1;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	return 0;
}

static void ibmpex_update_device(struct ibmpex_bmc_data *data)
{
	int i, err;

	mutex_lock(&data->lock);
	if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
	    data->valid)
		goto out;

	for (i = 0; i < data->num_sensors; i++) {
		if (!data->sensors[i].in_use)
			continue;
		err = ibmpex_query_sensor_data(data, i);
		if (err)
			continue;
		data->sensors[i].values[0] =
			extract_value(data->rx_msg_data, 16);
		data->sensors[i].values[1] =
			extract_value(data->rx_msg_data, 18);
		data->sensors[i].values[2] =
			extract_value(data->rx_msg_data, 20);
	}

	data->last_updated = jiffies;
	data->valid = 1;

out:
	mutex_unlock(&data->lock);
}

static struct ibmpex_bmc_data *get_bmc_data(int iface)
{
	struct ibmpex_bmc_data *p, *next;

	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
		if (p->interface == iface)
			return p;

	return NULL;
}

static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	return sprintf(buf, "%s\n", DRVNAME);
}
static SENSOR_DEVICE_ATTR_RO(name, name, 0);

static ssize_t ibmpex_show_sensor(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
	int mult = data->sensors[attr->index].multiplier;
	ibmpex_update_device(data);

	return sprintf(buf, "%d\n",
		       data->sensors[attr->index].values[attr->nr] * mult);
}

static ssize_t ibmpex_high_low_store(struct device *dev,
				     struct device_attribute *devattr,
				     const char *buf, size_t count)
{
	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);

	ibmpex_reset_high_low_data(data);

	return count;
}

static SENSOR_DEVICE_ATTR_WO(reset_high_low, ibmpex_high_low, 0);

static int is_power_sensor(const char *sensor_id, int len)
{
	if (len < PEX_SENSOR_TYPE_LEN)
		return 0;

	if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
		return 1;
	return 0;
}

static int is_temp_sensor(const char *sensor_id, int len)
{
	if (len < PEX_SENSOR_TYPE_LEN)
		return 0;

	if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
		return 1;
	return 0;
}

static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
				   const char *sensor_id, int len)
{
	int i;

	if (data->sensor_major == 2)
		return 1000000;

	for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
		if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
			return 1000000;

	return 100000;
}

static int create_sensor(struct ibmpex_bmc_data *data, int type,
			 int counter, int sensor, int func)
{
	int err;
	char *n;

	n = kmalloc(32, GFP_KERNEL);
	if (!n)
		return -ENOMEM;

	if (type == TEMP_SENSOR)
		sprintf(n, "temp%d_input%s",
			counter, sensor_name_suffixes[func]);
	else if (type == POWER_SENSOR)
		sprintf(n, "power%d_average%s",
			counter, sensor_name_suffixes[func]);

	sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
	data->sensors[sensor].attr[func].dev_attr.attr.name = n;
	data->sensors[sensor].attr[func].dev_attr.attr.mode = 0444;
	data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
	data->sensors[sensor].attr[func].index = sensor;
	data->sensors[sensor].attr[func].nr = func;

	err = device_create_file(data->bmc_device,
				 &data->sensors[sensor].attr[func].dev_attr);
	if (err) {
		data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
		kfree(n);
		return err;
	}

	return 0;
}

static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
{
	int i, j, err;
	int sensor_type;
	int sensor_counter;
	int num_power = 0;
	int num_temp = 0;

	err = ibmpex_query_sensor_count(data);
	if (err <= 0)
		return -ENOENT;
	data->num_sensors = err;

	data->sensors = kcalloc(data->num_sensors, sizeof(*data->sensors),
				GFP_KERNEL);
	if (!data->sensors)
		return -ENOMEM;

	for (i = 0; i < data->num_sensors; i++) {
		err = ibmpex_query_sensor_name(data, i);
		if (err)
			continue;

		if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
			sensor_type = POWER_SENSOR;
			num_power++;
			sensor_counter = num_power;
			data->sensors[i].multiplier =
				power_sensor_multiplier(data,
							data->rx_msg_data,
							data->rx_msg_len);
		} else if (is_temp_sensor(data->rx_msg_data,
					  data->rx_msg_len)) {
			sensor_type = TEMP_SENSOR;
			num_temp++;
			sensor_counter = num_temp;
			data->sensors[i].multiplier = 1000;
		} else
			continue;

		data->sensors[i].in_use = 1;

		/* Create attributes */
		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
			err = create_sensor(data, sensor_type, sensor_counter,
					    i, j);
			if (err)
				goto exit_remove;
		}
	}

	err = device_create_file(data->bmc_device,
			&sensor_dev_attr_reset_high_low.dev_attr);
	if (err)
		goto exit_remove;

	err = device_create_file(data->bmc_device,
			&sensor_dev_attr_name.dev_attr);
	if (err)
		goto exit_remove;

	return 0;

exit_remove:
	device_remove_file(data->bmc_device,
			   &sensor_dev_attr_reset_high_low.dev_attr);
	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
	for (i = 0; i < data->num_sensors; i++)
		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
			if (!data->sensors[i].attr[j].dev_attr.attr.name)
				continue;
			device_remove_file(data->bmc_device,
				&data->sensors[i].attr[j].dev_attr);
			kfree(data->sensors[i].attr[j].dev_attr.attr.name);
		}

	kfree(data->sensors);
	return err;
}

static void ibmpex_register_bmc(int iface, struct device *dev)
{
	struct ibmpex_bmc_data *data;
	int err;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return;

	data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	data->address.channel = IPMI_BMC_CHANNEL;
	data->address.data[0] = 0;
	data->interface = iface;
	data->bmc_device = dev;

	/* Create IPMI messaging interface user */
	err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
			       data, &data->user);
	if (err < 0) {
		dev_err(dev,
			"Unable to register user with IPMI interface %d\n",
			data->interface);
		goto out;
	}

	mutex_init(&data->lock);

	/* Initialize message */
	data->tx_msgid = 0;
	init_completion(&data->read_complete);
	data->tx_message.netfn = PEX_NET_FUNCTION;
	data->tx_message.cmd = PEX_COMMAND;
	data->tx_message.data = data->tx_msg_data;

	/* Does this BMC support PowerExecutive? */
	err = ibmpex_ver_check(data);
	if (err)
		goto out_user;

	/* Register the BMC as a HWMON class device */
	data->hwmon_dev = hwmon_device_register(data->bmc_device);

	if (IS_ERR(data->hwmon_dev)) {
		dev_err(data->bmc_device,
			"Unable to register hwmon device for IPMI interface %d\n",
			data->interface);
		goto out_user;
	}

	/* finally add the new bmc data to the bmc data list */
	dev_set_drvdata(dev, data);
	list_add_tail(&data->list, &driver_data.bmc_data);

	/* Now go find all the sensors */
	err = ibmpex_find_sensors(data);
	if (err) {
		dev_err(data->bmc_device, "Error %d finding sensors\n", err);
		goto out_register;
	}

	return;

out_register:
	hwmon_device_unregister(data->hwmon_dev);
out_user:
	ipmi_destroy_user(data->user);
out:
	kfree(data);
}

static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
{
	int i, j;

	device_remove_file(data->bmc_device,
			   &sensor_dev_attr_reset_high_low.dev_attr);
	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
	for (i = 0; i < data->num_sensors; i++)
		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
			if (!data->sensors[i].attr[j].dev_attr.attr.name)
				continue;
			device_remove_file(data->bmc_device,
				&data->sensors[i].attr[j].dev_attr);
			kfree(data->sensors[i].attr[j].dev_attr.attr.name);
		}

	list_del(&data->list);
	dev_set_drvdata(data->bmc_device, NULL);
	hwmon_device_unregister(data->hwmon_dev);
	ipmi_destroy_user(data->user);
	kfree(data->sensors);
	kfree(data);
}

static void ibmpex_bmc_gone(int iface)
{
	struct ibmpex_bmc_data *data = get_bmc_data(iface);

	if (!data)
		return;

	ibmpex_bmc_delete(data);
}

static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
{
	struct ibmpex_bmc_data *data = (struct ibmpex_bmc_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) {
		data->rx_msg_len = msg->msg.data_len - 1;
		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);
}

static int __init ibmpex_init(void)
{
	return ipmi_smi_watcher_register(&driver_data.bmc_events);
}

static void __exit ibmpex_exit(void)
{
	struct ibmpex_bmc_data *p, *next;

	ipmi_smi_watcher_unregister(&driver_data.bmc_events);
	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
		ibmpex_bmc_delete(p);
}

MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
MODULE_LICENSE("GPL");

module_init(ibmpex_init);
module_exit(ibmpex_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-*");
Commit	Line	Data
57c7c3a0 DW	1	/*
	2	* A hwmon driver for the IBM PowerExecutive temperature/power sensors
	3	* Copyright (C) 2007 IBM
	4	*
5407e051	5	* Author: Darrick J. Wong <darrick.wong@oracle.com>
57c7c3a0 DW	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/ipmi.h>
	23	#include <linux/module.h>
	24	#include <linux/hwmon.h>
	25	#include <linux/hwmon-sysfs.h>
	26	#include <linux/jiffies.h>
	27	#include <linux/mutex.h>
5a0e3ad6	28	#include <linux/slab.h>
fa845740	29	#include <linux/err.h>
57c7c3a0 DW	30
	31	#define REFRESH_INTERVAL (2 * HZ)
	32	#define DRVNAME "ibmpex"
	33
	34	#define PEX_GET_VERSION 1
	35	#define PEX_GET_SENSOR_COUNT 2
	36	#define PEX_GET_SENSOR_NAME 3
	37	#define PEX_RESET_HIGH_LOW 4
	38	#define PEX_GET_SENSOR_DATA 6
	39
	40	#define PEX_NET_FUNCTION 0x3A
	41	#define PEX_COMMAND 0x3C
	42
	43	static inline u16 extract_value(const char *data, int offset)
	44	{
29041b4b	45	return be16_to_cpup((__be16 *)&data[offset]);
57c7c3a0 DW	46	}
	47
	48	#define TEMP_SENSOR 1
	49	#define POWER_SENSOR 2
	50
	51	#define PEX_SENSOR_TYPE_LEN 3
	52	static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
	53	static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D};
	54
	55	#define PEX_MULT_LEN 2
	56	static u8 const watt_sensor_sig[] = {0x41, 0x43};
	57
	58	#define PEX_NUM_SENSOR_FUNCS 3
a0fc74d4 RV	59	static const char * const sensor_name_suffixes[] = {
	60	"",
	61	"_lowest",
	62	"_highest"
57c7c3a0 DW	63	};
	64
	65	static void ibmpex_msg_handler(struct ipmi_recv_msg msg, void user_msg_data);
	66	static void ibmpex_register_bmc(int iface, struct device *dev);
	67	static void ibmpex_bmc_gone(int iface);
	68
	69	struct ibmpex_sensor_data {
	70	int in_use;
	71	s16 values[PEX_NUM_SENSOR_FUNCS];
	72	int multiplier;
	73
	74	struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS];
	75	};
	76
	77	struct ibmpex_bmc_data {
	78	struct list_head list;
	79	struct device *hwmon_dev;
	80	struct device *bmc_device;
	81	struct mutex lock;
	82	char valid;
	83	unsigned long last_updated; /* In jiffies */
	84
	85	struct ipmi_addr address;
	86	struct completion read_complete;
3f901c86	87	struct ipmi_user *user;
57c7c3a0 DW	88	int interface;
	89
	90	struct kernel_ipmi_msg tx_message;
	91	unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH];
	92	long tx_msgid;
	93
	94	unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH];
	95	unsigned long rx_msg_len;
	96	unsigned char rx_result;
	97	int rx_recv_type;
	98
	99	unsigned char sensor_major;
	100	unsigned char sensor_minor;
	101
	102	unsigned char num_sensors;
	103	struct ibmpex_sensor_data *sensors;
	104	};
	105
	106	struct ibmpex_driver_data {
	107	struct list_head bmc_data;
	108	struct ipmi_smi_watcher bmc_events;
	109	struct ipmi_user_hndl ipmi_hndlrs;
	110	};
	111
	112	static struct ibmpex_driver_data driver_data = {
	113	.bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
	114	.bmc_events = {
	115	.owner = THIS_MODULE,
	116	.new_smi = ibmpex_register_bmc,
	117	.smi_gone = ibmpex_bmc_gone,
	118	},
	119	.ipmi_hndlrs = {
	120	.ipmi_recv_hndl = ibmpex_msg_handler,
	121	},
	122	};
	123
	124	static int ibmpex_send_message(struct ibmpex_bmc_data *data)
	125	{
	126	int err;
	127
	128	err = ipmi_validate_addr(&data->address, sizeof(data->address));
	129	if (err)
	130	goto out;
	131
	132	data->tx_msgid++;
	133	err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
	134	&data->tx_message, data, 0, 0, 0);
	135	if (err)
	136	goto out1;
	137
	138	return 0;
	139	out1:
2ecb044e	140	dev_err(data->bmc_device, "request_settime=%x\n", err);
57c7c3a0 DW	141	return err;
57c7c3a0 DW	142	out:
2ecb044e	143	dev_err(data->bmc_device, "validate_addr=%x\n", err);
57c7c3a0 DW	144	return err;
	145	}
	146
	147	static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
	148	{
	149	data->tx_msg_data[0] = PEX_GET_VERSION;
	150	data->tx_message.data_len = 1;
	151	ibmpex_send_message(data);
	152
	153	wait_for_completion(&data->read_complete);
	154
	155	if (data->rx_result \|\| data->rx_msg_len != 6)
	156	return -ENOENT;
	157
	158	data->sensor_major = data->rx_msg_data[0];
	159	data->sensor_minor = data->rx_msg_data[1];
	160
b55f3757 GR	161	dev_info(data->bmc_device,
b55f3757 GR	162	"Found BMC with sensor interface v%d.%d %d-%02d-%02d on interface %d\n",
2ecb044e DW	163	data->sensor_major,
	164	data->sensor_minor,
	165	extract_value(data->rx_msg_data, 2),
	166	data->rx_msg_data[4],
	167	data->rx_msg_data[5],
	168	data->interface);
57c7c3a0 DW	169
	170	return 0;
	171	}
	172
	173	static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
	174	{
	175	data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
	176	data->tx_message.data_len = 1;
	177	ibmpex_send_message(data);
	178
	179	wait_for_completion(&data->read_complete);
	180
	181	if (data->rx_result \|\| data->rx_msg_len != 1)
	182	return -ENOENT;
	183
	184	return data->rx_msg_data[0];
	185	}
	186
	187	static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
	188	{
	189	data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
	190	data->tx_msg_data[1] = sensor;
	191	data->tx_message.data_len = 2;
	192	ibmpex_send_message(data);
	193
	194	wait_for_completion(&data->read_complete);
	195
	196	if (data->rx_result \|\| data->rx_msg_len < 1)
	197	return -ENOENT;
	198
	199	return 0;
	200	}
	201
	202	static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
	203	{
	204	data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
	205	data->tx_msg_data[1] = sensor;
	206	data->tx_message.data_len = 2;
	207	ibmpex_send_message(data);
	208
	209	wait_for_completion(&data->read_complete);
	210
	211	if (data->rx_result \|\| data->rx_msg_len < 26) {
2ecb044e DW	212	dev_err(data->bmc_device, "Error reading sensor %d.\n",
2ecb044e DW	213	sensor);
57c7c3a0 DW	214	return -ENOENT;
	215	}
	216
	217	return 0;
	218	}
	219
	220	static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
	221	{
	222	data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
	223	data->tx_message.data_len = 1;
	224	ibmpex_send_message(data);
	225
	226	wait_for_completion(&data->read_complete);
	227
	228	return 0;
	229	}
	230
	231	static void ibmpex_update_device(struct ibmpex_bmc_data *data)
	232	{
	233	int i, err;
	234
	235	mutex_lock(&data->lock);
	236	if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
	237	data->valid)
	238	goto out;
	239
	240	for (i = 0; i < data->num_sensors; i++) {
	241	if (!data->sensors[i].in_use)
	242	continue;
	243	err = ibmpex_query_sensor_data(data, i);
	244	if (err)
	245	continue;
	246	data->sensors[i].values[0] =
	247	extract_value(data->rx_msg_data, 16);
	248	data->sensors[i].values[1] =
	249	extract_value(data->rx_msg_data, 18);
	250	data->sensors[i].values[2] =
	251	extract_value(data->rx_msg_data, 20);
	252	}
	253
	254	data->last_updated = jiffies;
	255	data->valid = 1;
	256
	257	out:
	258	mutex_unlock(&data->lock);
	259	}
	260
	261	static struct ibmpex_bmc_data *get_bmc_data(int iface)
	262	{
	263	struct ibmpex_bmc_data p, next;
	264
	265	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
	266	if (p->interface == iface)
	267	return p;
	268
	269	return NULL;
	270	}
	271
09cb4161	272	static ssize_t name_show(struct device dev, struct device_attribute devattr,
57c7c3a0 DW	273	char *buf)
	274	{
	275	return sprintf(buf, "%s\n", DRVNAME);
	276	}
09cb4161	277	static SENSOR_DEVICE_ATTR_RO(name, name, 0);
57c7c3a0 DW	278
	279	static ssize_t ibmpex_show_sensor(struct device *dev,
	280	struct device_attribute *devattr,
	281	char *buf)
	282	{
	283	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
	284	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
	285	int mult = data->sensors[attr->index].multiplier;
	286	ibmpex_update_device(data);
	287
	288	return sprintf(buf, "%d\n",
	289	data->sensors[attr->index].values[attr->nr] * mult);
	290	}
	291
09cb4161	292	static ssize_t ibmpex_high_low_store(struct device *dev,
57c7c3a0	293	struct device_attribute *devattr,
09cb4161	294	const char *buf, size_t count)
57c7c3a0 DW	295	{
	296	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
	297
	298	ibmpex_reset_high_low_data(data);
	299
	300	return count;
	301	}
	302
09cb4161	303	static SENSOR_DEVICE_ATTR_WO(reset_high_low, ibmpex_high_low, 0);
57c7c3a0 DW	304
	305	static int is_power_sensor(const char *sensor_id, int len)
	306	{
	307	if (len < PEX_SENSOR_TYPE_LEN)
	308	return 0;
	309
	310	if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
	311	return 1;
	312	return 0;
	313	}
	314
	315	static int is_temp_sensor(const char *sensor_id, int len)
	316	{
	317	if (len < PEX_SENSOR_TYPE_LEN)
	318	return 0;
	319
	320	if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
	321	return 1;
	322	return 0;
	323	}
	324
df9cb033 DW	325	static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
df9cb033 DW	326	const char *sensor_id, int len)
57c7c3a0 DW	327	{
	328	int i;
	329
df9cb033 DW	330	if (data->sensor_major == 2)
	331	return 1000000;
	332
57c7c3a0 DW	333	for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
	334	if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
	335	return 1000000;
	336
	337	return 100000;
	338	}
	339
	340	static int create_sensor(struct ibmpex_bmc_data *data, int type,
	341	int counter, int sensor, int func)
	342	{
	343	int err;
	344	char *n;
	345
	346	n = kmalloc(32, GFP_KERNEL);
	347	if (!n)
	348	return -ENOMEM;
	349
	350	if (type == TEMP_SENSOR)
a0fc74d4 RV	351	sprintf(n, "temp%d_input%s",
a0fc74d4 RV	352	counter, sensor_name_suffixes[func]);
57c7c3a0	353	else if (type == POWER_SENSOR)
a0fc74d4 RV	354	sprintf(n, "power%d_average%s",
a0fc74d4 RV	355	counter, sensor_name_suffixes[func]);
57c7c3a0	356
fb794e0f	357	sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
57c7c3a0	358	data->sensors[sensor].attr[func].dev_attr.attr.name = n;
09cb4161	359	data->sensors[sensor].attr[func].dev_attr.attr.mode = 0444;
57c7c3a0 DW	360	data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
	361	data->sensors[sensor].attr[func].index = sensor;
	362	data->sensors[sensor].attr[func].nr = func;
	363
	364	err = device_create_file(data->bmc_device,
	365	&data->sensors[sensor].attr[func].dev_attr);
	366	if (err) {
	367	data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
	368	kfree(n);
	369	return err;
	370	}
	371
	372	return 0;
	373	}
	374
	375	static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
	376	{
	377	int i, j, err;
	378	int sensor_type;
	379	int sensor_counter;
	380	int num_power = 0;
	381	int num_temp = 0;
	382
	383	err = ibmpex_query_sensor_count(data);
	384	if (err <= 0)
	385	return -ENOENT;
	386	data->num_sensors = err;
	387
6396bb22	388	data->sensors = kcalloc(data->num_sensors, sizeof(*data->sensors),
57c7c3a0 DW	389	GFP_KERNEL);
	390	if (!data->sensors)
	391	return -ENOMEM;
	392
	393	for (i = 0; i < data->num_sensors; i++) {
	394	err = ibmpex_query_sensor_name(data, i);
	395	if (err)
	396	continue;
	397
	398	if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
	399	sensor_type = POWER_SENSOR;
	400	num_power++;
	401	sensor_counter = num_power;
	402	data->sensors[i].multiplier =
df9cb033 DW	403	power_sensor_multiplier(data,
	404	data->rx_msg_data,
	405	data->rx_msg_len);
57c7c3a0 DW	406	} else if (is_temp_sensor(data->rx_msg_data,
	407	data->rx_msg_len)) {
	408	sensor_type = TEMP_SENSOR;
	409	num_temp++;
	410	sensor_counter = num_temp;
ffda6857	411	data->sensors[i].multiplier = 1000;
57c7c3a0 DW	412	} else
	413	continue;
	414
	415	data->sensors[i].in_use = 1;
	416
	417	/* Create attributes */
	418	for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
	419	err = create_sensor(data, sensor_type, sensor_counter,
	420	i, j);
	421	if (err)
	422	goto exit_remove;
	423	}
	424	}
	425
	426	err = device_create_file(data->bmc_device,
	427	&sensor_dev_attr_reset_high_low.dev_attr);
	428	if (err)
	429	goto exit_remove;
	430
	431	err = device_create_file(data->bmc_device,
	432	&sensor_dev_attr_name.dev_attr);
	433	if (err)
	434	goto exit_remove;
	435
	436	return 0;
	437
	438	exit_remove:
	439	device_remove_file(data->bmc_device,
	440	&sensor_dev_attr_reset_high_low.dev_attr);
	441	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
	442	for (i = 0; i < data->num_sensors; i++)
	443	for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
	444	if (!data->sensors[i].attr[j].dev_attr.attr.name)
	445	continue;
	446	device_remove_file(data->bmc_device,
	447	&data->sensors[i].attr[j].dev_attr);
	448	kfree(data->sensors[i].attr[j].dev_attr.attr.name);
	449	}
	450
	451	kfree(data->sensors);
	452	return err;
	453	}
	454
	455	static void ibmpex_register_bmc(int iface, struct device *dev)
	456	{
	457	struct ibmpex_bmc_data *data;
	458	int err;
	459
	460	data = kzalloc(sizeof(*data), GFP_KERNEL);
6d33d304	461	if (!data)
57c7c3a0	462	return;
57c7c3a0 DW	463
	464	data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	465	data->address.channel = IPMI_BMC_CHANNEL;
	466	data->address.data[0] = 0;
	467	data->interface = iface;
	468	data->bmc_device = dev;
	469
	470	/* Create IPMI messaging interface user */
	471	err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
	472	data, &data->user);
	473	if (err < 0) {
b55f3757 GR	474	dev_err(dev,
	475	"Unable to register user with IPMI interface %d\n",
	476	data->interface);
57c7c3a0 DW	477	goto out;
	478	}
	479
	480	mutex_init(&data->lock);
	481
	482	/* Initialize message */
	483	data->tx_msgid = 0;
	484	init_completion(&data->read_complete);
	485	data->tx_message.netfn = PEX_NET_FUNCTION;
	486	data->tx_message.cmd = PEX_COMMAND;
	487	data->tx_message.data = data->tx_msg_data;
	488
	489	/* Does this BMC support PowerExecutive? */
	490	err = ibmpex_ver_check(data);
	491	if (err)
	492	goto out_user;
	493
	494	/* Register the BMC as a HWMON class device */
	495	data->hwmon_dev = hwmon_device_register(data->bmc_device);
	496
	497	if (IS_ERR(data->hwmon_dev)) {
b55f3757 GR	498	dev_err(data->bmc_device,
b55f3757 GR	499	"Unable to register hwmon device for IPMI interface %d\n",
2ecb044e	500	data->interface);
4cfdbe7f	501	goto out_user;
57c7c3a0 DW	502	}
	503
	504	/* finally add the new bmc data to the bmc data list */
	505	dev_set_drvdata(dev, data);
	506	list_add_tail(&data->list, &driver_data.bmc_data);
	507
	508	/* Now go find all the sensors */
	509	err = ibmpex_find_sensors(data);
	510	if (err) {
2ecb044e	511	dev_err(data->bmc_device, "Error %d finding sensors\n", err);
57c7c3a0 DW	512	goto out_register;
	513	}
	514
	515	return;
	516
	517	out_register:
	518	hwmon_device_unregister(data->hwmon_dev);
	519	out_user:
	520	ipmi_destroy_user(data->user);
	521	out:
	522	kfree(data);
	523	}
	524
	525	static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
	526	{
	527	int i, j;
	528
	529	device_remove_file(data->bmc_device,
	530	&sensor_dev_attr_reset_high_low.dev_attr);
	531	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
	532	for (i = 0; i < data->num_sensors; i++)
	533	for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
	534	if (!data->sensors[i].attr[j].dev_attr.attr.name)
	535	continue;
	536	device_remove_file(data->bmc_device,
	537	&data->sensors[i].attr[j].dev_attr);
	538	kfree(data->sensors[i].attr[j].dev_attr.attr.name);
	539	}
	540
	541	list_del(&data->list);
	542	dev_set_drvdata(data->bmc_device, NULL);
	543	hwmon_device_unregister(data->hwmon_dev);
	544	ipmi_destroy_user(data->user);
	545	kfree(data->sensors);
	546	kfree(data);
	547	}
	548
	549	static void ibmpex_bmc_gone(int iface)
	550	{
	551	struct ibmpex_bmc_data *data = get_bmc_data(iface);
	552
	553	if (!data)
	554	return;
	555
	556	ibmpex_bmc_delete(data);
	557	}
	558
	559	static void ibmpex_msg_handler(struct ipmi_recv_msg msg, void user_msg_data)
	560	{
	561	struct ibmpex_bmc_data data = (struct ibmpex_bmc_data )user_msg_data;
	562
	563	if (msg->msgid != data->tx_msgid) {
b55f3757 GR	564	dev_err(data->bmc_device,
b55f3757 GR	565	"Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n",
2ecb044e DW	566	(int)msg->msgid,
2ecb044e DW	567	(int)data->tx_msgid);
57c7c3a0 DW	568	ipmi_free_recv_msg(msg);
	569	return;
	570	}
	571
	572	data->rx_recv_type = msg->recv_type;
	573	if (msg->msg.data_len > 0)
	574	data->rx_result = msg->msg.data[0];
	575	else
	576	data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
	577
	578	if (msg->msg.data_len > 1) {
	579	data->rx_msg_len = msg->msg.data_len - 1;
	580	memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
	581	} else
	582	data->rx_msg_len = 0;
	583
	584	ipmi_free_recv_msg(msg);
	585	complete(&data->read_complete);
	586	}
	587
	588	static int __init ibmpex_init(void)
	589	{
	590	return ipmi_smi_watcher_register(&driver_data.bmc_events);
	591	}
	592
	593	static void __exit ibmpex_exit(void)
	594	{
	595	struct ibmpex_bmc_data p, next;
	596
	597	ipmi_smi_watcher_unregister(&driver_data.bmc_events);
	598	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
	599	ibmpex_bmc_delete(p);
	600	}
	601
5407e051	602	MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
57c7c3a0 DW	603	MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
	604	MODULE_LICENSE("GPL");
	605
	606	module_init(ibmpex_init);
	607	module_exit(ibmpex_exit);
ff921361 DW	608
	609	MODULE_ALIAS("dmi:bvnIBM::pnIBMSystemx3350-");
	610	MODULE_ALIAS("dmi:bvnIBM::pnIBMSystemx3550-");
	611	MODULE_ALIAS("dmi:bvnIBM::pnIBMSystemx3650-");
	612	MODULE_ALIAS("dmi:bvnIBM::pnIBMSystemx3655-");
	613	MODULE_ALIAS("dmi:bvnIBM::pnIBMSystemx3755-");