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

/*
 * A hwmon driver for the IBM PowerExecutive temperature/power sensors
 * Copyright (C) 2007 IBM
 *
 * Author: Darrick J. Wong <djwong@us.ibm.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>

#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((u16 *)&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 char const * const power_sensor_name_templates[] = {
	"%s%d_average",
	"%s%d_average_lowest",
	"%s%d_average_highest"
};
static char const * const temp_sensor_name_templates[] = {
	"%s%d_input",
	"%s%d_input_lowest",
	"%s%d_input_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;
	ipmi_user_t		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 show_name(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	return sprintf(buf, "%s\n", DRVNAME);
}
static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 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_reset_high_low(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(reset_high_low, S_IWUSR, NULL,
			  ibmpex_reset_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(const char *sensor_id, int len)
{
	int i;

	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_sensor_name_templates[func], "temp", counter);
	else if (type == POWER_SENSOR)
		sprintf(n, power_sensor_name_templates[func], "power", counter);

	data->sensors[sensor].attr[func].dev_attr.attr.name = n;
	data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
	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 = kzalloc(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->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 = 1;
		} 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) {
		dev_err(dev, "Insufficient memory for BMC interface.\n");
		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 <djwong@us.ibm.com>");
MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
MODULE_LICENSE("GPL");

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