drivers/hwmon/smsc47b397.c - kernel/msm-4.9 - Gitiles

 /*
     smsc47b397.c - Part of lm_sensors, Linux kernel modules
 			for hardware monitoring

     Supports the SMSC LPC47B397-NC Super-I/O chip.

     Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
 	Copyright (C) 2004 Utilitek Systems, Inc.

     derived in part from smsc47m1.c:
 	Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
 	Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>

     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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <linux/jiffies.h>
 #include <linux/i2c.h>
 #include <linux/i2c-isa.h>
 #include <linux/hwmon.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <asm/io.h>

 /* Address is autodetected, there is no default value */
 static unsigned short address;

 /* Super-I/0 registers and commands */

 #define	REG	0x2e	/* The register to read/write */
 #define	VAL	0x2f	/* The value to read/write */

 static inline void superio_outb(int reg, int val)
 {
 	outb(reg, REG);
 	outb(val, VAL);
 }

 static inline int superio_inb(int reg)
 {
 	outb(reg, REG);
 	return inb(VAL);
 }

 /* select superio logical device */
 static inline void superio_select(int ld)
 {
 	superio_outb(0x07, ld);
 }

 static inline void superio_enter(void)
 {
 	outb(0x55, REG);
 }

 static inline void superio_exit(void)
 {
 	outb(0xAA, REG);
 }

 #define SUPERIO_REG_DEVID	0x20
 #define SUPERIO_REG_DEVREV	0x21
 #define SUPERIO_REG_BASE_MSB	0x60
 #define SUPERIO_REG_BASE_LSB	0x61
 #define SUPERIO_REG_LD8		0x08

 #define SMSC_EXTENT		0x02

 /* 0 <= nr <= 3 */
 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
 #define SMSC47B397_REG_TEMP(nr)	(smsc47b397_reg_temp[(nr)])

 /* 0 <= nr <= 3 */
 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))

 struct smsc47b397_data {
 	struct i2c_client client;
 	struct class_device *class_dev;
 	struct mutex lock;

 	struct mutex update_lock;
 	unsigned long last_updated; /* in jiffies */
 	int valid;

 	/* register values */
 	u16 fan[4];
 	u8 temp[4];
 };

 static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
 {
 	struct smsc47b397_data *data = i2c_get_clientdata(client);
 	int res;

 	mutex_lock(&data->lock);
 	outb(reg, client->addr);
 	res = inb_p(client->addr + 1);
 	mutex_unlock(&data->lock);
 	return res;
 }

 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
 {
  	struct i2c_client *client = to_i2c_client(dev);
 	struct smsc47b397_data *data = i2c_get_clientdata(client);
 	int i;

 	mutex_lock(&data->update_lock);

 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 		dev_dbg(&client->dev, "starting device update...\n");

 		/* 4 temperature inputs, 4 fan inputs */
 		for (i = 0; i < 4; i++) {
 			data->temp[i] = smsc47b397_read_value(client,
 					SMSC47B397_REG_TEMP(i));

 			/* must read LSB first */
 			data->fan[i]  = smsc47b397_read_value(client,
 					SMSC47B397_REG_FAN_LSB(i));
 			data->fan[i] |= smsc47b397_read_value(client,
 					SMSC47B397_REG_FAN_MSB(i)) << 8;
 		}

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

 		dev_dbg(&client->dev, "... device update complete\n");
 	}

 	mutex_unlock(&data->update_lock);

 	return data;
 }

 /* TEMP: 0.001C/bit (-128C to +127C)
    REG: 1C/bit, two's complement */
 static int temp_from_reg(u8 reg)
 {
 	return (s8)reg * 1000;
 }

 /* 0 <= nr <= 3 */
 static ssize_t show_temp(struct device *dev, char *buf, int nr)
 {
 	struct smsc47b397_data *data = smsc47b397_update_device(dev);
 	return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
 }

 #define sysfs_temp(num) \
 static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
 { \
 	return show_temp(dev, buf, num-1); \
 } \
 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)

 sysfs_temp(1);
 sysfs_temp(2);
 sysfs_temp(3);
 sysfs_temp(4);

 /* FAN: 1 RPM/bit
    REG: count of 90kHz pulses / revolution */
 static int fan_from_reg(u16 reg)
 {
 	return 90000 * 60 / reg;
 }

 /* 0 <= nr <= 3 */
 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 {
         struct smsc47b397_data *data = smsc47b397_update_device(dev);
         return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
 }

 #define sysfs_fan(num) \
 static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \
 { \
 	return show_fan(dev, buf, num-1); \
 } \
 static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)

 sysfs_fan(1);
 sysfs_fan(2);
 sysfs_fan(3);
 sysfs_fan(4);

 static struct attribute *smsc47b397_attributes[] = {
 	&dev_attr_temp1_input.attr,
 	&dev_attr_temp2_input.attr,
 	&dev_attr_temp3_input.attr,
 	&dev_attr_temp4_input.attr,
 	&dev_attr_fan1_input.attr,
 	&dev_attr_fan2_input.attr,
 	&dev_attr_fan3_input.attr,
 	&dev_attr_fan4_input.attr,

 	NULL
 };

 static const struct attribute_group smsc47b397_group = {
 	.attrs = smsc47b397_attributes,
 };

 static int smsc47b397_detach_client(struct i2c_client *client)
 {
 	struct smsc47b397_data *data = i2c_get_clientdata(client);
 	int err;

 	hwmon_device_unregister(data->class_dev);
 	sysfs_remove_group(&client->dev.kobj, &smsc47b397_group);

 	if ((err = i2c_detach_client(client)))
 		return err;

 	release_region(client->addr, SMSC_EXTENT);
 	kfree(data);

 	return 0;
 }

 static int smsc47b397_detect(struct i2c_adapter *adapter);

 static struct i2c_driver smsc47b397_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= "smsc47b397",
 	},
 	.attach_adapter	= smsc47b397_detect,
 	.detach_client	= smsc47b397_detach_client,
 };

 static int smsc47b397_detect(struct i2c_adapter *adapter)
 {
 	struct i2c_client *new_client;
 	struct smsc47b397_data *data;
 	int err = 0;

 	if (!request_region(address, SMSC_EXTENT,
 			    smsc47b397_driver.driver.name)) {
 		dev_err(&adapter->dev, "Region 0x%x already in use!\n",
 			address);
 		return -EBUSY;
 	}

 	if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
 		err = -ENOMEM;
 		goto error_release;
 	}

 	new_client = &data->client;
 	i2c_set_clientdata(new_client, data);
 	new_client->addr = address;
 	mutex_init(&data->lock);
 	new_client->adapter = adapter;
 	new_client->driver = &smsc47b397_driver;
 	new_client->flags = 0;

 	strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);

 	mutex_init(&data->update_lock);

 	if ((err = i2c_attach_client(new_client)))
 		goto error_free;

 	if ((err = sysfs_create_group(&new_client->dev.kobj, &smsc47b397_group)))
 		goto error_detach;

 	data->class_dev = hwmon_device_register(&new_client->dev);
 	if (IS_ERR(data->class_dev)) {
 		err = PTR_ERR(data->class_dev);
 		goto error_remove;
 	}

 	return 0;

 error_remove:
 	sysfs_remove_group(&new_client->dev.kobj, &smsc47b397_group);
 error_detach:
 	i2c_detach_client(new_client);
 error_free:
 	kfree(data);
 error_release:
 	release_region(address, SMSC_EXTENT);
 	return err;
 }

 static int __init smsc47b397_find(unsigned short *addr)
 {
 	u8 id, rev;

 	superio_enter();
 	id = superio_inb(SUPERIO_REG_DEVID);

 	if ((id != 0x6f) && (id != 0x81)) {
 		superio_exit();
 		return -ENODEV;
 	}

 	rev = superio_inb(SUPERIO_REG_DEVREV);

 	superio_select(SUPERIO_REG_LD8);
 	*addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
 		 |  superio_inb(SUPERIO_REG_BASE_LSB);

 	printk(KERN_INFO "smsc47b397: found SMSC %s "
 		"(base address 0x%04x, revision %u)\n",
 		id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);

 	superio_exit();
 	return 0;
 }

 static int __init smsc47b397_init(void)
 {
 	int ret;

 	if ((ret = smsc47b397_find(&address)))
 		return ret;

 	return i2c_isa_add_driver(&smsc47b397_driver);
 }

 static void __exit smsc47b397_exit(void)
 {
 	i2c_isa_del_driver(&smsc47b397_driver);
 }

 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
 MODULE_LICENSE("GPL");

 module_init(smsc47b397_init);
 module_exit(smsc47b397_exit);
	/*
	smsc47b397.c - Part of lm_sensors, Linux kernel modules
	for hardware monitoring

	Supports the SMSC LPC47B397-NC Super-I/O chip.

	Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
	Copyright (C) 2004 Utilitek Systems, Inc.

	derived in part from smsc47m1.c:
	Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
	Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>

	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., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/ioport.h>
	#include <linux/jiffies.h>
	#include <linux/i2c.h>
	#include <linux/i2c-isa.h>
	#include <linux/hwmon.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/mutex.h>
	#include <asm/io.h>

	/* Address is autodetected, there is no default value */
	static unsigned short address;

	/* Super-I/0 registers and commands */

	#define REG 0x2e /* The register to read/write */
	#define VAL 0x2f /* The value to read/write */

	static inline void superio_outb(int reg, int val)
	{
	outb(reg, REG);
	outb(val, VAL);
	}

	static inline int superio_inb(int reg)
	{
	outb(reg, REG);
	return inb(VAL);
	}

	/* select superio logical device */
	static inline void superio_select(int ld)
	{
	superio_outb(0x07, ld);
	}

	static inline void superio_enter(void)
	{
	outb(0x55, REG);
	}

	static inline void superio_exit(void)
	{
	outb(0xAA, REG);
	}

	#define SUPERIO_REG_DEVID 0x20
	#define SUPERIO_REG_DEVREV 0x21
	#define SUPERIO_REG_BASE_MSB 0x60
	#define SUPERIO_REG_BASE_LSB 0x61
	#define SUPERIO_REG_LD8 0x08

	#define SMSC_EXTENT 0x02

	/* 0 <= nr <= 3 */
	static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
	#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])

	/* 0 <= nr <= 3 */
	#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
	#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))

	struct smsc47b397_data {
	struct i2c_client client;
	struct class_device *class_dev;
	struct mutex lock;

	struct mutex update_lock;
	unsigned long last_updated; /* in jiffies */
	int valid;

	/* register values */
	u16 fan[4];
	u8 temp[4];
	};

	static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
	{
	struct smsc47b397_data *data = i2c_get_clientdata(client);
	int res;

	mutex_lock(&data->lock);
	outb(reg, client->addr);
	res = inb_p(client->addr + 1);
	mutex_unlock(&data->lock);
	return res;
	}

	static struct smsc47b397_data smsc47b397_update_device(struct device dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct smsc47b397_data *data = i2c_get_clientdata(client);
	int i;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
	dev_dbg(&client->dev, "starting device update...\n");

	/* 4 temperature inputs, 4 fan inputs */
	for (i = 0; i < 4; i++) {
	data->temp[i] = smsc47b397_read_value(client,
	SMSC47B397_REG_TEMP(i));

	/* must read LSB first */
	data->fan[i] = smsc47b397_read_value(client,
	SMSC47B397_REG_FAN_LSB(i));
	data->fan[i] \|= smsc47b397_read_value(client,
	SMSC47B397_REG_FAN_MSB(i)) << 8;
	}

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

	dev_dbg(&client->dev, "... device update complete\n");
	}

	mutex_unlock(&data->update_lock);

	return data;
	}

	/* TEMP: 0.001C/bit (-128C to +127C)
	REG: 1C/bit, two's complement */
	static int temp_from_reg(u8 reg)
	{
	return (s8)reg * 1000;
	}

	/* 0 <= nr <= 3 */
	static ssize_t show_temp(struct device dev, char buf, int nr)
	{
	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
	}

	#define sysfs_temp(num) \
	static ssize_t show_temp##num(struct device dev, struct device_attribute attr, char *buf) \
	{ \
	return show_temp(dev, buf, num-1); \
	} \
	static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)

	sysfs_temp(1);
	sysfs_temp(2);
	sysfs_temp(3);
	sysfs_temp(4);

	/* FAN: 1 RPM/bit
	REG: count of 90kHz pulses / revolution */
	static int fan_from_reg(u16 reg)
	{
	return 90000 * 60 / reg;
	}

	/* 0 <= nr <= 3 */
	static ssize_t show_fan(struct device dev, char buf, int nr)
	{
	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
	}

	#define sysfs_fan(num) \
	static ssize_t show_fan##num(struct device dev, struct device_attribute attr, char *buf) \
	{ \
	return show_fan(dev, buf, num-1); \
	} \
	static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)

	sysfs_fan(1);
	sysfs_fan(2);
	sysfs_fan(3);
	sysfs_fan(4);

	static struct attribute *smsc47b397_attributes[] = {
	&dev_attr_temp1_input.attr,
	&dev_attr_temp2_input.attr,
	&dev_attr_temp3_input.attr,
	&dev_attr_temp4_input.attr,
	&dev_attr_fan1_input.attr,
	&dev_attr_fan2_input.attr,
	&dev_attr_fan3_input.attr,
	&dev_attr_fan4_input.attr,

	NULL
	};

	static const struct attribute_group smsc47b397_group = {
	.attrs = smsc47b397_attributes,
	};

	static int smsc47b397_detach_client(struct i2c_client *client)
	{
	struct smsc47b397_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->class_dev);
	sysfs_remove_group(&client->dev.kobj, &smsc47b397_group);

	if ((err = i2c_detach_client(client)))
	return err;

	release_region(client->addr, SMSC_EXTENT);
	kfree(data);

	return 0;
	}

	static int smsc47b397_detect(struct i2c_adapter *adapter);

	static struct i2c_driver smsc47b397_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = "smsc47b397",
	},
	.attach_adapter = smsc47b397_detect,
	.detach_client = smsc47b397_detach_client,
	};

	static int smsc47b397_detect(struct i2c_adapter *adapter)
	{
	struct i2c_client *new_client;
	struct smsc47b397_data *data;
	int err = 0;

	if (!request_region(address, SMSC_EXTENT,
	smsc47b397_driver.driver.name)) {
	dev_err(&adapter->dev, "Region 0x%x already in use!\n",
	address);
	return -EBUSY;
	}

	if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
	err = -ENOMEM;
	goto error_release;
	}

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	mutex_init(&data->lock);
	new_client->adapter = adapter;
	new_client->driver = &smsc47b397_driver;
	new_client->flags = 0;

	strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);

	mutex_init(&data->update_lock);

	if ((err = i2c_attach_client(new_client)))
	goto error_free;

	if ((err = sysfs_create_group(&new_client->dev.kobj, &smsc47b397_group)))
	goto error_detach;

	data->class_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->class_dev)) {
	err = PTR_ERR(data->class_dev);
	goto error_remove;
	}

	return 0;

	error_remove:
	sysfs_remove_group(&new_client->dev.kobj, &smsc47b397_group);
	error_detach:
	i2c_detach_client(new_client);
	error_free:
	kfree(data);
	error_release:
	release_region(address, SMSC_EXTENT);
	return err;
	}

	static int __init smsc47b397_find(unsigned short *addr)
	{
	u8 id, rev;

	superio_enter();
	id = superio_inb(SUPERIO_REG_DEVID);

	if ((id != 0x6f) && (id != 0x81)) {
	superio_exit();
	return -ENODEV;
	}

	rev = superio_inb(SUPERIO_REG_DEVREV);

	superio_select(SUPERIO_REG_LD8);
	*addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
	\| superio_inb(SUPERIO_REG_BASE_LSB);

	printk(KERN_INFO "smsc47b397: found SMSC %s "
	"(base address 0x%04x, revision %u)\n",
	id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);

	superio_exit();
	return 0;
	}

	static int __init smsc47b397_init(void)
	{
	int ret;

	if ((ret = smsc47b397_find(&address)))
	return ret;

	return i2c_isa_add_driver(&smsc47b397_driver);
	}

	static void __exit smsc47b397_exit(void)
	{
	i2c_isa_del_driver(&smsc47b397_driver);
	}

	MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
	MODULE_DESCRIPTION("SMSC LPC47B397 driver");
	MODULE_LICENSE("GPL");

	module_init(smsc47b397_init);
	module_exit(smsc47b397_exit);