drivers/hwmon/k8temp.c - arm/linux - Git at Google

 /*
  * k8temp.c - Linux kernel module for hardware monitoring
  *
  * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
  *
  * Inspired from the w83785 and amd756 drivers.
  *
  * 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., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301 USA.
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/jiffies.h>
 #include <linux/pci.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <asm/processor.h>

 #define TEMP_FROM_REG(val)	(((((val) >> 16) & 0xff) - 49) * 1000)
 #define REG_TEMP	0xe4
 #define SEL_PLACE	0x40
 #define SEL_CORE	0x04

 struct k8temp_data {
 	struct device *hwmon_dev;
 	struct mutex update_lock;
 	const char *name;
 	char valid;		/* zero until following fields are valid */
 	unsigned long last_updated;	/* in jiffies */

 	/* registers values */
 	u8 sensorsp;		/* sensor presence bits - SEL_CORE, SEL_PLACE */
 	u32 temp[2][2];		/* core, place */
 	u8 swap_core_select;    /* meaning of SEL_CORE is inverted */
 	u32 temp_offset;
 };

 static struct k8temp_data *k8temp_update_device(struct device *dev)
 {
 	struct k8temp_data *data = dev_get_drvdata(dev);
 	struct pci_dev *pdev = to_pci_dev(dev);
 	u8 tmp;

 	mutex_lock(&data->update_lock);

 	if (!data->valid
 	    || time_after(jiffies, data->last_updated + HZ)) {
 		pci_read_config_byte(pdev, REG_TEMP, &tmp);
 		tmp &= ~(SEL_PLACE | SEL_CORE);	/* Select sensor 0, core0 */
 		pci_write_config_byte(pdev, REG_TEMP, tmp);
 		pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);

 		if (data->sensorsp & SEL_PLACE) {
 			tmp |= SEL_PLACE;	/* Select sensor 1, core0 */
 			pci_write_config_byte(pdev, REG_TEMP, tmp);
 			pci_read_config_dword(pdev, REG_TEMP,
 					      &data->temp[0][1]);
 		}

 		if (data->sensorsp & SEL_CORE) {
 			tmp &= ~SEL_PLACE;	/* Select sensor 0, core1 */
 			tmp |= SEL_CORE;
 			pci_write_config_byte(pdev, REG_TEMP, tmp);
 			pci_read_config_dword(pdev, REG_TEMP,
 					      &data->temp[1][0]);

 			if (data->sensorsp & SEL_PLACE) {
 				tmp |= SEL_PLACE; /* Select sensor 1, core1 */
 				pci_write_config_byte(pdev, REG_TEMP, tmp);
 				pci_read_config_dword(pdev, REG_TEMP,
 						      &data->temp[1][1]);
 			}
 		}

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

 	mutex_unlock(&data->update_lock);
 	return data;
 }

 /*
  * Sysfs stuff
  */

 static ssize_t name_show(struct device *dev, struct device_attribute
 			 *devattr, char *buf)
 {
 	struct k8temp_data *data = dev_get_drvdata(dev);

 	return sprintf(buf, "%s\n", data->name);
 }


 static ssize_t show_temp(struct device *dev,
 			 struct device_attribute *devattr, char *buf)
 {
 	struct sensor_device_attribute_2 *attr =
 	    to_sensor_dev_attr_2(devattr);
 	int core = attr->nr;
 	int place = attr->index;
 	int temp;
 	struct k8temp_data *data = k8temp_update_device(dev);

 	if (data->swap_core_select && (data->sensorsp & SEL_CORE))
 		core = core ? 0 : 1;

 	temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;

 	return sprintf(buf, "%d\n", temp);
 }

 /* core, place */

 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
 static DEVICE_ATTR_RO(name);

 static const struct pci_device_id k8temp_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
 	{ 0 },
 };

 MODULE_DEVICE_TABLE(pci, k8temp_ids);

 static int is_rev_g_desktop(u8 model)
 {
 	u32 brandidx;

 	if (model < 0x69)
 		return 0;

 	if (model == 0xc1 || model == 0x6c || model == 0x7c)
 		return 0;

 	/*
 	 * Differentiate between AM2 and ASB1.
 	 * See "Constructing the processor Name String" in "Revision
 	 * Guide for AMD NPT Family 0Fh Processors" (33610).
 	 */
 	brandidx = cpuid_ebx(0x80000001);
 	brandidx = (brandidx >> 9) & 0x1f;

 	/* Single core */
 	if ((model == 0x6f || model == 0x7f) &&
 	    (brandidx == 0x7 || brandidx == 0x9 || brandidx == 0xc))
 		return 0;

 	/* Dual core */
 	if (model == 0x6b &&
 	    (brandidx == 0xb || brandidx == 0xc))
 		return 0;

 	return 1;
 }

 static int k8temp_probe(struct pci_dev *pdev,
 				  const struct pci_device_id *id)
 {
 	int err;
 	u8 scfg;
 	u32 temp;
 	u8 model, stepping;
 	struct k8temp_data *data;

 	data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	model = boot_cpu_data.x86_model;
 	stepping = boot_cpu_data.x86_mask;

 	/* feature available since SH-C0, exclude older revisions */
 	if ((model == 4 && stepping == 0) ||
 	    (model == 5 && stepping <= 1))
 		return -ENODEV;

 	/*
 	 * AMD NPT family 0fh, i.e. RevF and RevG:
 	 * meaning of SEL_CORE bit is inverted
 	 */
 	if (model >= 0x40) {
 		data->swap_core_select = 1;
 		dev_warn(&pdev->dev,
 			 "Temperature readouts might be wrong - check erratum #141\n");
 	}

 	/*
 	 * RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need
 	 * additional offset, otherwise reported temperature is below
 	 * ambient temperature
 	 */
 	if (is_rev_g_desktop(model))
 		data->temp_offset = 21000;

 	pci_read_config_byte(pdev, REG_TEMP, &scfg);
 	scfg &= ~(SEL_PLACE | SEL_CORE);	/* Select sensor 0, core0 */
 	pci_write_config_byte(pdev, REG_TEMP, scfg);
 	pci_read_config_byte(pdev, REG_TEMP, &scfg);

 	if (scfg & (SEL_PLACE | SEL_CORE)) {
 		dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 		return -ENODEV;
 	}

 	scfg |= (SEL_PLACE | SEL_CORE);
 	pci_write_config_byte(pdev, REG_TEMP, scfg);

 	/* now we know if we can change core and/or sensor */
 	pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);

 	if (data->sensorsp & SEL_PLACE) {
 		scfg &= ~SEL_CORE;	/* Select sensor 1, core0 */
 		pci_write_config_byte(pdev, REG_TEMP, scfg);
 		pci_read_config_dword(pdev, REG_TEMP, &temp);
 		scfg |= SEL_CORE;	/* prepare for next selection */
 		if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
 			data->sensorsp &= ~SEL_PLACE;
 	}

 	if (data->sensorsp & SEL_CORE) {
 		scfg &= ~SEL_PLACE;	/* Select sensor 0, core1 */
 		pci_write_config_byte(pdev, REG_TEMP, scfg);
 		pci_read_config_dword(pdev, REG_TEMP, &temp);
 		if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
 			data->sensorsp &= ~SEL_CORE;
 	}

 	data->name = "k8temp";
 	mutex_init(&data->update_lock);
 	pci_set_drvdata(pdev, data);

 	/* Register sysfs hooks */
 	err = device_create_file(&pdev->dev,
 			   &sensor_dev_attr_temp1_input.dev_attr);
 	if (err)
 		goto exit_remove;

 	/* sensor can be changed and reports something */
 	if (data->sensorsp & SEL_PLACE) {
 		err = device_create_file(&pdev->dev,
 				   &sensor_dev_attr_temp2_input.dev_attr);
 		if (err)
 			goto exit_remove;
 	}

 	/* core can be changed and reports something */
 	if (data->sensorsp & SEL_CORE) {
 		err = device_create_file(&pdev->dev,
 				   &sensor_dev_attr_temp3_input.dev_attr);
 		if (err)
 			goto exit_remove;
 		if (data->sensorsp & SEL_PLACE) {
 			err = device_create_file(&pdev->dev,
 					   &sensor_dev_attr_temp4_input.
 					   dev_attr);
 			if (err)
 				goto exit_remove;
 		}
 	}

 	err = device_create_file(&pdev->dev, &dev_attr_name);
 	if (err)
 		goto exit_remove;

 	data->hwmon_dev = hwmon_device_register(&pdev->dev);

 	if (IS_ERR(data->hwmon_dev)) {
 		err = PTR_ERR(data->hwmon_dev);
 		goto exit_remove;
 	}

 	return 0;

 exit_remove:
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp1_input.dev_attr);
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp2_input.dev_attr);
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp3_input.dev_attr);
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp4_input.dev_attr);
 	device_remove_file(&pdev->dev, &dev_attr_name);
 	return err;
 }

 static void k8temp_remove(struct pci_dev *pdev)
 {
 	struct k8temp_data *data = pci_get_drvdata(pdev);

 	hwmon_device_unregister(data->hwmon_dev);
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp1_input.dev_attr);
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp2_input.dev_attr);
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp3_input.dev_attr);
 	device_remove_file(&pdev->dev,
 			   &sensor_dev_attr_temp4_input.dev_attr);
 	device_remove_file(&pdev->dev, &dev_attr_name);
 }

 static struct pci_driver k8temp_driver = {
 	.name = "k8temp",
 	.id_table = k8temp_ids,
 	.probe = k8temp_probe,
 	.remove = k8temp_remove,
 };

 module_pci_driver(k8temp_driver);

 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 MODULE_LICENSE("GPL");
	/*
	* k8temp.c - Linux kernel module for hardware monitoring
	*
	* Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
	*
	* Inspired from the w83785 and amd756 drivers.
	*
	* 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., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301 USA.
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/jiffies.h>
	#include <linux/pci.h>
	#include <linux/hwmon.h>
	#include <linux/hwmon-sysfs.h>
	#include <linux/err.h>
	#include <linux/mutex.h>
	#include <asm/processor.h>

	#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
	#define REG_TEMP 0xe4
	#define SEL_PLACE 0x40
	#define SEL_CORE 0x04

	struct k8temp_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	const char *name;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values */
	u8 sensorsp; /* sensor presence bits - SEL_CORE, SEL_PLACE */
	u32 temp[2][2]; /* core, place */
	u8 swap_core_select; /* meaning of SEL_CORE is inverted */
	u32 temp_offset;
	};

	static struct k8temp_data k8temp_update_device(struct device dev)
	{
	struct k8temp_data *data = dev_get_drvdata(dev);
	struct pci_dev *pdev = to_pci_dev(dev);
	u8 tmp;

	mutex_lock(&data->update_lock);

	if (!data->valid
	\|\| time_after(jiffies, data->last_updated + HZ)) {
	pci_read_config_byte(pdev, REG_TEMP, &tmp);
	tmp &= ~(SEL_PLACE \| SEL_CORE); /* Select sensor 0, core0 */
	pci_write_config_byte(pdev, REG_TEMP, tmp);
	pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);

	if (data->sensorsp & SEL_PLACE) {
	tmp \|= SEL_PLACE; /* Select sensor 1, core0 */
	pci_write_config_byte(pdev, REG_TEMP, tmp);
	pci_read_config_dword(pdev, REG_TEMP,
	&data->temp[0][1]);
	}

	if (data->sensorsp & SEL_CORE) {
	tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
	tmp \|= SEL_CORE;
	pci_write_config_byte(pdev, REG_TEMP, tmp);
	pci_read_config_dword(pdev, REG_TEMP,
	&data->temp[1][0]);

	if (data->sensorsp & SEL_PLACE) {
	tmp \|= SEL_PLACE; /* Select sensor 1, core1 */
	pci_write_config_byte(pdev, REG_TEMP, tmp);
	pci_read_config_dword(pdev, REG_TEMP,
	&data->temp[1][1]);
	}
	}

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

	mutex_unlock(&data->update_lock);
	return data;
	}

	/*
	* Sysfs stuff
	*/

	static ssize_t name_show(struct device *dev, struct device_attribute
	devattr, char buf)
	{
	struct k8temp_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", data->name);
	}


	static ssize_t show_temp(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	struct sensor_device_attribute_2 *attr =
	to_sensor_dev_attr_2(devattr);
	int core = attr->nr;
	int place = attr->index;
	int temp;
	struct k8temp_data *data = k8temp_update_device(dev);

	if (data->swap_core_select && (data->sensorsp & SEL_CORE))
	core = core ? 0 : 1;

	temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;

	return sprintf(buf, "%d\n", temp);
	}

	/* core, place */

	static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
	static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
	static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
	static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
	static DEVICE_ATTR_RO(name);

	static const struct pci_device_id k8temp_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
	{ 0 },
	};

	MODULE_DEVICE_TABLE(pci, k8temp_ids);

	static int is_rev_g_desktop(u8 model)
	{
	u32 brandidx;

	if (model < 0x69)
	return 0;

	if (model == 0xc1 \|\| model == 0x6c \|\| model == 0x7c)
	return 0;

	/*
	* Differentiate between AM2 and ASB1.
	* See "Constructing the processor Name String" in "Revision
	* Guide for AMD NPT Family 0Fh Processors" (33610).
	*/
	brandidx = cpuid_ebx(0x80000001);
	brandidx = (brandidx >> 9) & 0x1f;

	/* Single core */
	if ((model == 0x6f \|\| model == 0x7f) &&
	(brandidx == 0x7 \|\| brandidx == 0x9 \|\| brandidx == 0xc))
	return 0;

	/* Dual core */
	if (model == 0x6b &&
	(brandidx == 0xb \|\| brandidx == 0xc))
	return 0;

	return 1;
	}

	static int k8temp_probe(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	int err;
	u8 scfg;
	u32 temp;
	u8 model, stepping;
	struct k8temp_data *data;

	data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	model = boot_cpu_data.x86_model;
	stepping = boot_cpu_data.x86_mask;

	/* feature available since SH-C0, exclude older revisions */
	if ((model == 4 && stepping == 0) \|\|
	(model == 5 && stepping <= 1))
	return -ENODEV;

	/*
	* AMD NPT family 0fh, i.e. RevF and RevG:
	* meaning of SEL_CORE bit is inverted
	*/
	if (model >= 0x40) {
	data->swap_core_select = 1;
	dev_warn(&pdev->dev,
	"Temperature readouts might be wrong - check erratum #141\n");
	}

	/*
	* RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need
	* additional offset, otherwise reported temperature is below
	* ambient temperature
	*/
	if (is_rev_g_desktop(model))
	data->temp_offset = 21000;

	pci_read_config_byte(pdev, REG_TEMP, &scfg);
	scfg &= ~(SEL_PLACE \| SEL_CORE); /* Select sensor 0, core0 */
	pci_write_config_byte(pdev, REG_TEMP, scfg);
	pci_read_config_byte(pdev, REG_TEMP, &scfg);

	if (scfg & (SEL_PLACE \| SEL_CORE)) {
	dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
	return -ENODEV;
	}

	scfg \|= (SEL_PLACE \| SEL_CORE);
	pci_write_config_byte(pdev, REG_TEMP, scfg);

	/* now we know if we can change core and/or sensor */
	pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);

	if (data->sensorsp & SEL_PLACE) {
	scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
	pci_write_config_byte(pdev, REG_TEMP, scfg);
	pci_read_config_dword(pdev, REG_TEMP, &temp);
	scfg \|= SEL_CORE; /* prepare for next selection */
	if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
	data->sensorsp &= ~SEL_PLACE;
	}

	if (data->sensorsp & SEL_CORE) {
	scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
	pci_write_config_byte(pdev, REG_TEMP, scfg);
	pci_read_config_dword(pdev, REG_TEMP, &temp);
	if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
	data->sensorsp &= ~SEL_CORE;
	}

	data->name = "k8temp";
	mutex_init(&data->update_lock);
	pci_set_drvdata(pdev, data);

	/* Register sysfs hooks */
	err = device_create_file(&pdev->dev,
	&sensor_dev_attr_temp1_input.dev_attr);
	if (err)
	goto exit_remove;

	/* sensor can be changed and reports something */
	if (data->sensorsp & SEL_PLACE) {
	err = device_create_file(&pdev->dev,
	&sensor_dev_attr_temp2_input.dev_attr);
	if (err)
	goto exit_remove;
	}

	/* core can be changed and reports something */
	if (data->sensorsp & SEL_CORE) {
	err = device_create_file(&pdev->dev,
	&sensor_dev_attr_temp3_input.dev_attr);
	if (err)
	goto exit_remove;
	if (data->sensorsp & SEL_PLACE) {
	err = device_create_file(&pdev->dev,
	&sensor_dev_attr_temp4_input.
	dev_attr);
	if (err)
	goto exit_remove;
	}
	}

	err = device_create_file(&pdev->dev, &dev_attr_name);
	if (err)
	goto exit_remove;

	data->hwmon_dev = hwmon_device_register(&pdev->dev);

	if (IS_ERR(data->hwmon_dev)) {
	err = PTR_ERR(data->hwmon_dev);
	goto exit_remove;
	}

	return 0;

	exit_remove:
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp1_input.dev_attr);
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp2_input.dev_attr);
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp3_input.dev_attr);
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp4_input.dev_attr);
	device_remove_file(&pdev->dev, &dev_attr_name);
	return err;
	}

	static void k8temp_remove(struct pci_dev *pdev)
	{
	struct k8temp_data *data = pci_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp1_input.dev_attr);
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp2_input.dev_attr);
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp3_input.dev_attr);
	device_remove_file(&pdev->dev,
	&sensor_dev_attr_temp4_input.dev_attr);
	device_remove_file(&pdev->dev, &dev_attr_name);
	}

	static struct pci_driver k8temp_driver = {
	.name = "k8temp",
	.id_table = k8temp_ids,
	.probe = k8temp_probe,
	.remove = k8temp_remove,
	};

	module_pci_driver(k8temp_driver);

	MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
	MODULE_DESCRIPTION("AMD K8 core temperature monitor");
	MODULE_LICENSE("GPL");