[linux-2.6-block.git] / drivers / hwmon / k8temp.c

/*
 * 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/delay.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 */
};

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 show_name(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;
	struct k8temp_data *data = k8temp_update_device(dev);

	return sprintf(buf, "%d\n",
		       TEMP_FROM_REG(data->temp[core][place]));
}

/* 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(name, S_IRUGO, show_name, NULL);

static 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 __devinit 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;

	if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

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

	switch (boot_cpu_data.x86) {
	case 0xf:
		/* feature available since SH-C0, exclude older revisions */
		if (((model == 4) && (stepping == 0)) ||
		    ((model == 5) && (stepping <= 1))) {
			err = -ENODEV;
			goto exit_free;
		}

		if (model >= 0x40) {
			dev_warn(&pdev->dev, "Temperature readouts might be "
				 "wrong - check erratum #141\n");
		}

		break;
	}

	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");
		err = -ENODEV;
		goto exit_free;
	}

	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 not likely */
			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 not likely */
			data->sensorsp &= ~SEL_CORE;
	}

	data->name = "k8temp";
	mutex_init(&data->update_lock);
	dev_set_drvdata(&pdev->dev, 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);
exit_free:
	dev_set_drvdata(&pdev->dev, NULL);
	kfree(data);
exit:
	return err;
}

static void __devexit k8temp_remove(struct pci_dev *pdev)
{
	struct k8temp_data *data = dev_get_drvdata(&pdev->dev);

	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);
	dev_set_drvdata(&pdev->dev, NULL);
	kfree(data);
}

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

static int __init k8temp_init(void)
{
	return pci_register_driver(&k8temp_driver);
}

static void __exit k8temp_exit(void)
{
	pci_unregister_driver(&k8temp_driver);
}

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

module_init(k8temp_init)
module_exit(k8temp_exit)
Commit	Line	Data
29fa06c1 RM	1	/*
	2	* k8temp.c - Linux kernel module for hardware monitoring
	3	*
7188cc66	4	* Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
29fa06c1 RM	5	*
	6	* Inspired from the w83785 and amd756 drivers.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	21	* 02110-1301 USA.
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/delay.h>
	26	#include <linux/init.h>
	27	#include <linux/slab.h>
	28	#include <linux/jiffies.h>
	29	#include <linux/pci.h>
	30	#include <linux/hwmon.h>
	31	#include <linux/hwmon-sysfs.h>
	32	#include <linux/err.h>
	33	#include <linux/mutex.h>
bb9a35f2	34	#include <asm/processor.h>
29fa06c1 RM	35
	36	#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
	37	#define REG_TEMP 0xe4
	38	#define SEL_PLACE 0x40
	39	#define SEL_CORE 0x04
	40
	41	struct k8temp_data {
1beeffe4	42	struct device *hwmon_dev;
29fa06c1 RM	43	struct mutex update_lock;
	44	const char *name;
	45	char valid; /* zero until following fields are valid */
	46	unsigned long last_updated; /* in jiffies */
	47
	48	/* registers values */
	49	u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
	50	u32 temp[2][2]; /* core, place */
	51	};
	52
	53	static struct k8temp_data k8temp_update_device(struct device dev)
	54	{
	55	struct k8temp_data *data = dev_get_drvdata(dev);
	56	struct pci_dev *pdev = to_pci_dev(dev);
	57	u8 tmp;
	58
	59	mutex_lock(&data->update_lock);
	60
	61	if (!data->valid
	62	\|\| time_after(jiffies, data->last_updated + HZ)) {
	63	pci_read_config_byte(pdev, REG_TEMP, &tmp);
	64	tmp &= ~(SEL_PLACE \| SEL_CORE); /* Select sensor 0, core0 */
	65	pci_write_config_byte(pdev, REG_TEMP, tmp);
	66	pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
	67
	68	if (data->sensorsp & SEL_PLACE) {
	69	tmp \|= SEL_PLACE; /* Select sensor 1, core0 */
	70	pci_write_config_byte(pdev, REG_TEMP, tmp);
	71	pci_read_config_dword(pdev, REG_TEMP,
	72	&data->temp[0][1]);
	73	}
	74
	75	if (data->sensorsp & SEL_CORE) {
	76	tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
	77	tmp \|= SEL_CORE;
	78	pci_write_config_byte(pdev, REG_TEMP, tmp);
	79	pci_read_config_dword(pdev, REG_TEMP,
	80	&data->temp[1][0]);
	81
	82	if (data->sensorsp & SEL_PLACE) {
	83	tmp \|= SEL_PLACE; /* Select sensor 1, core1 */
	84	pci_write_config_byte(pdev, REG_TEMP, tmp);
	85	pci_read_config_dword(pdev, REG_TEMP,
	86	&data->temp[1][1]);
	87	}
	88	}
	89
	90	data->last_updated = jiffies;
	91	data->valid = 1;
	92	}
	93
	94	mutex_unlock(&data->update_lock);
	95	return data;
	96	}
	97
	98	/*
	99	* Sysfs stuff
	100	*/
	101
	102	static ssize_t show_name(struct device *dev, struct device_attribute
	103	devattr, char buf)
	104	{
	105	struct k8temp_data *data = dev_get_drvdata(dev);
	106
107	return sprintf(buf, "%s\n", data->name);
108	}
109
110
111	static ssize_t show_temp(struct device *dev,
112	struct device_attribute devattr, char buf)
113	{
114	struct sensor_device_attribute_2 *attr =
115	to_sensor_dev_attr_2(devattr);
116	int core = attr->nr;
117	int place = attr->index;
118	struct k8temp_data *data = k8temp_update_device(dev);
119
120	return sprintf(buf, "%d\n",
121	TEMP_FROM_REG(data->temp[core][place]));
122	}
123
124	/* core, place */
125
126	static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
127	static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
128	static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
129	static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
130	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
131
132	static struct pci_device_id k8temp_ids[] = {
133	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
134	{ 0 },
135	};
136
b17ebc94 JD	137	MODULE_DEVICE_TABLE(pci, k8temp_ids);
b17ebc94 JD	138
29fa06c1 RM	139	static int __devinit k8temp_probe(struct pci_dev *pdev,
	140	const struct pci_device_id *id)
	141	{
	142	int err;
	143	u8 scfg;
	144	u32 temp;
bb9a35f2	145	u8 model, stepping;
29fa06c1	146	struct k8temp_data *data;
29fa06c1 RM	147
	148	if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
	149	err = -ENOMEM;
	150	goto exit;
	151	}
	152
bb9a35f2 AH	153	model = boot_cpu_data.x86_model;
	154	stepping = boot_cpu_data.x86_mask;
	155
	156	switch (boot_cpu_data.x86) {
	157	case 0xf:
	158	/* feature available since SH-C0, exclude older revisions */
	159	if (((model == 4) && (stepping == 0)) \|\|
	160	((model == 5) && (stepping <= 1))) {
	161	err = -ENODEV;
	162	goto exit_free;
	163	}
	164
	165	if (model >= 0x40) {
	166	dev_warn(&pdev->dev, "Temperature readouts might be "
	167	"wrong - check erratum #141\n");
	168	}
	169
	170	break;
	171	}
	172
29fa06c1 RM	173	pci_read_config_byte(pdev, REG_TEMP, &scfg);
	174	scfg &= ~(SEL_PLACE \| SEL_CORE); /* Select sensor 0, core0 */
	175	pci_write_config_byte(pdev, REG_TEMP, scfg);
	176	pci_read_config_byte(pdev, REG_TEMP, &scfg);
	177
	178	if (scfg & (SEL_PLACE \| SEL_CORE)) {
	179	dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
	180	err = -ENODEV;
	181	goto exit_free;
	182	}
	183
	184	scfg \|= (SEL_PLACE \| SEL_CORE);
	185	pci_write_config_byte(pdev, REG_TEMP, scfg);
	186
	187	/* now we know if we can change core and/or sensor */
	188	pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
	189
	190	if (data->sensorsp & SEL_PLACE) {
	191	scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
	192	pci_write_config_byte(pdev, REG_TEMP, scfg);
	193	pci_read_config_dword(pdev, REG_TEMP, &temp);
	194	scfg \|= SEL_CORE; /* prepare for next selection */
	195	if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
	196	data->sensorsp &= ~SEL_PLACE;
	197	}
	198
	199	if (data->sensorsp & SEL_CORE) {
	200	scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
	201	pci_write_config_byte(pdev, REG_TEMP, scfg);
	202	pci_read_config_dword(pdev, REG_TEMP, &temp);
	203	if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
	204	data->sensorsp &= ~SEL_CORE;
	205	}
	206
	207	data->name = "k8temp";
	208	mutex_init(&data->update_lock);
	209	dev_set_drvdata(&pdev->dev, data);
	210
	211	/* Register sysfs hooks */
	212	err = device_create_file(&pdev->dev,
	213	&sensor_dev_attr_temp1_input.dev_attr);
	214	if (err)
	215	goto exit_remove;
	216
	217	/* sensor can be changed and reports something */
	218	if (data->sensorsp & SEL_PLACE) {
	219	err = device_create_file(&pdev->dev,
	220	&sensor_dev_attr_temp2_input.dev_attr);
	221	if (err)
	222	goto exit_remove;
	223	}
	224
	225	/* core can be changed and reports something */
	226	if (data->sensorsp & SEL_CORE) {
	227	err = device_create_file(&pdev->dev,
	228	&sensor_dev_attr_temp3_input.dev_attr);
	229	if (err)
	230	goto exit_remove;
	231	if (data->sensorsp & SEL_PLACE)
	232	err = device_create_file(&pdev->dev,
	233	&sensor_dev_attr_temp4_input.
	234	dev_attr);
	235	if (err)
	236	goto exit_remove;
237	}
238
239	err = device_create_file(&pdev->dev, &dev_attr_name);
240	if (err)
241	goto exit_remove;
242
1beeffe4	243	data->hwmon_dev = hwmon_device_register(&pdev->dev);
29fa06c1	244
1beeffe4 TJ	245	if (IS_ERR(data->hwmon_dev)) {
1beeffe4 TJ	246	err = PTR_ERR(data->hwmon_dev);
29fa06c1 RM	247	goto exit_remove;
	248	}
	249
	250	return 0;
	251
	252	exit_remove:
	253	device_remove_file(&pdev->dev,
	254	&sensor_dev_attr_temp1_input.dev_attr);
	255	device_remove_file(&pdev->dev,
	256	&sensor_dev_attr_temp2_input.dev_attr);
	257	device_remove_file(&pdev->dev,
	258	&sensor_dev_attr_temp3_input.dev_attr);
	259	device_remove_file(&pdev->dev,
	260	&sensor_dev_attr_temp4_input.dev_attr);
	261	device_remove_file(&pdev->dev, &dev_attr_name);
	262	exit_free:
	263	dev_set_drvdata(&pdev->dev, NULL);
	264	kfree(data);
	265	exit:
	266	return err;
	267	}
	268
	269	static void __devexit k8temp_remove(struct pci_dev *pdev)
	270	{
	271	struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
	272
1beeffe4	273	hwmon_device_unregister(data->hwmon_dev);
29fa06c1 RM	274	device_remove_file(&pdev->dev,
	275	&sensor_dev_attr_temp1_input.dev_attr);
	276	device_remove_file(&pdev->dev,
	277	&sensor_dev_attr_temp2_input.dev_attr);
	278	device_remove_file(&pdev->dev,
	279	&sensor_dev_attr_temp3_input.dev_attr);
	280	device_remove_file(&pdev->dev,
	281	&sensor_dev_attr_temp4_input.dev_attr);
	282	device_remove_file(&pdev->dev, &dev_attr_name);
	283	dev_set_drvdata(&pdev->dev, NULL);
	284	kfree(data);
	285	}
	286
	287	static struct pci_driver k8temp_driver = {
	288	.name = "k8temp",
	289	.id_table = k8temp_ids,
	290	.probe = k8temp_probe,
	291	.remove = __devexit_p(k8temp_remove),
	292	};
	293
	294	static int __init k8temp_init(void)
	295	{
	296	return pci_register_driver(&k8temp_driver);
	297	}
	298
	299	static void __exit k8temp_exit(void)
	300	{
	301	pci_unregister_driver(&k8temp_driver);
	302	}
	303
7188cc66	304	MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
29fa06c1 RM	305	MODULE_DESCRIPTION("AMD K8 core temperature monitor");
	306	MODULE_LICENSE("GPL");
	307
	308	module_init(k8temp_init)
	309	module_exit(k8temp_exit)