[net-next-2.6.git] / drivers / hwmon / k8temp.c

/*
 * k8temp.c - Linux kernel module for hardware monitoring
 *
 * Copyright (C) 2006 Rudolf Marek <r.marek@sh.cvut.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>

#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 class_device *class_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 },
};

static int __devinit k8temp_probe(struct pci_dev *pdev,
				  const struct pci_device_id *id)
{
	int err;
	u8 scfg;
	u32 temp;
	struct k8temp_data *data;
	u32 cpuid = cpuid_eax(1);

	/* this feature should be available since SH-C0 core */
	if ((cpuid == 0xf40) || (cpuid == 0xf50) || (cpuid == 0xf51)) {
		err = -ENODEV;
		goto exit;
	}

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

	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->class_dev = hwmon_device_register(&pdev->dev);

	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_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->class_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@sh.cvut.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	*
	4	* Copyright (C) 2006 Rudolf Marek <r.marek@sh.cvut.cz>
	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>
	34
	35	#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
	36	#define REG_TEMP 0xe4
	37	#define SEL_PLACE 0x40
	38	#define SEL_CORE 0x04
	39
	40	struct k8temp_data {
	41	struct class_device *class_dev;
	42	struct mutex update_lock;
	43	const char *name;
	44	char valid; /* zero until following fields are valid */
	45	unsigned long last_updated; /* in jiffies */
	46
	47	/* registers values */
	48	u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
	49	u32 temp[2][2]; /* core, place */
	50	};
	51
	52	static struct k8temp_data k8temp_update_device(struct device dev)
	53	{
	54	struct k8temp_data *data = dev_get_drvdata(dev);
	55	struct pci_dev *pdev = to_pci_dev(dev);
	56	u8 tmp;
	57
	58	mutex_lock(&data->update_lock);
	59
	60	if (!data->valid
	61	\|\| time_after(jiffies, data->last_updated + HZ)) {
	62	pci_read_config_byte(pdev, REG_TEMP, &tmp);
	63	tmp &= ~(SEL_PLACE \| SEL_CORE); /* Select sensor 0, core0 */
	64	pci_write_config_byte(pdev, REG_TEMP, tmp);
65	pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
66
67	if (data->sensorsp & SEL_PLACE) {
68	tmp \|= SEL_PLACE; /* Select sensor 1, core0 */
69	pci_write_config_byte(pdev, REG_TEMP, tmp);
70	pci_read_config_dword(pdev, REG_TEMP,
71	&data->temp[0][1]);
72	}
73
74	if (data->sensorsp & SEL_CORE) {
75	tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
76	tmp \|= SEL_CORE;
77	pci_write_config_byte(pdev, REG_TEMP, tmp);
78	pci_read_config_dword(pdev, REG_TEMP,
79	&data->temp[1][0]);
80
81	if (data->sensorsp & SEL_PLACE) {
82	tmp \|= SEL_PLACE; /* Select sensor 1, core1 */
83	pci_write_config_byte(pdev, REG_TEMP, tmp);
84	pci_read_config_dword(pdev, REG_TEMP,
85	&data->temp[1][1]);
86	}
87	}
88
89	data->last_updated = jiffies;
90	data->valid = 1;
91	}
92
93	mutex_unlock(&data->update_lock);
94	return data;
95	}
96
97	/*
98	* Sysfs stuff
99	*/
100
101	static ssize_t show_name(struct device *dev, struct device_attribute
102	devattr, char buf)
103	{
104	struct k8temp_data *data = dev_get_drvdata(dev);
105
106	return sprintf(buf, "%s\n", data->name);
107	}
108
109
110	static ssize_t show_temp(struct device *dev,
111	struct device_attribute devattr, char buf)
112	{
113	struct sensor_device_attribute_2 *attr =
114	to_sensor_dev_attr_2(devattr);
115	int core = attr->nr;
116	int place = attr->index;
117	struct k8temp_data *data = k8temp_update_device(dev);
118
119	return sprintf(buf, "%d\n",
120	TEMP_FROM_REG(data->temp[core][place]));
121	}
122
123	/* core, place */
124
125	static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
126	static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
127	static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
128	static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
129	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
130
131	static struct pci_device_id k8temp_ids[] = {
132	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
133	{ 0 },
134	};
135
136	static int __devinit k8temp_probe(struct pci_dev *pdev,
137	const struct pci_device_id *id)
138	{
139	int err;
140	u8 scfg;
141	u32 temp;
142	struct k8temp_data *data;
143	u32 cpuid = cpuid_eax(1);
144
145	/* this feature should be available since SH-C0 core */
146	if ((cpuid == 0xf40) \|\| (cpuid == 0xf50) \|\| (cpuid == 0xf51)) {
147	err = -ENODEV;
148	goto exit;
149	}
150
151	if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
152	err = -ENOMEM;
153	goto exit;
154	}
155
156	pci_read_config_byte(pdev, REG_TEMP, &scfg);
157	scfg &= ~(SEL_PLACE \| SEL_CORE); /* Select sensor 0, core0 */
158	pci_write_config_byte(pdev, REG_TEMP, scfg);
159	pci_read_config_byte(pdev, REG_TEMP, &scfg);
160
161	if (scfg & (SEL_PLACE \| SEL_CORE)) {
162	dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
163	err = -ENODEV;
164	goto exit_free;
165	}
166
167	scfg \|= (SEL_PLACE \| SEL_CORE);
168	pci_write_config_byte(pdev, REG_TEMP, scfg);
169
170	/* now we know if we can change core and/or sensor */
171	pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
172
173	if (data->sensorsp & SEL_PLACE) {
174	scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
175	pci_write_config_byte(pdev, REG_TEMP, scfg);
176	pci_read_config_dword(pdev, REG_TEMP, &temp);
177	scfg \|= SEL_CORE; /* prepare for next selection */
178	if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
179	data->sensorsp &= ~SEL_PLACE;
180	}
181
182	if (data->sensorsp & SEL_CORE) {
183	scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
184	pci_write_config_byte(pdev, REG_TEMP, scfg);
185	pci_read_config_dword(pdev, REG_TEMP, &temp);
186	if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
187	data->sensorsp &= ~SEL_CORE;
188	}
189
190	data->name = "k8temp";
191	mutex_init(&data->update_lock);
192	dev_set_drvdata(&pdev->dev, data);
193
194	/* Register sysfs hooks */
195	err = device_create_file(&pdev->dev,
196	&sensor_dev_attr_temp1_input.dev_attr);
197	if (err)
198	goto exit_remove;
199
200	/* sensor can be changed and reports something */
201	if (data->sensorsp & SEL_PLACE) {
202	err = device_create_file(&pdev->dev,
203	&sensor_dev_attr_temp2_input.dev_attr);
204	if (err)
205	goto exit_remove;
206	}
207
208	/* core can be changed and reports something */
209	if (data->sensorsp & SEL_CORE) {
210	err = device_create_file(&pdev->dev,
211	&sensor_dev_attr_temp3_input.dev_attr);
212	if (err)
213	goto exit_remove;
214	if (data->sensorsp & SEL_PLACE)
215	err = device_create_file(&pdev->dev,
216	&sensor_dev_attr_temp4_input.
217	dev_attr);
218	if (err)
219	goto exit_remove;
220	}
221
222	err = device_create_file(&pdev->dev, &dev_attr_name);
223	if (err)
224	goto exit_remove;
225
226	data->class_dev = hwmon_device_register(&pdev->dev);
227
228	if (IS_ERR(data->class_dev)) {
229	err = PTR_ERR(data->class_dev);
230	goto exit_remove;
231	}
232
233	return 0;
234
235	exit_remove:
236	device_remove_file(&pdev->dev,
237	&sensor_dev_attr_temp1_input.dev_attr);
238	device_remove_file(&pdev->dev,
239	&sensor_dev_attr_temp2_input.dev_attr);
240	device_remove_file(&pdev->dev,
241	&sensor_dev_attr_temp3_input.dev_attr);
242	device_remove_file(&pdev->dev,
243	&sensor_dev_attr_temp4_input.dev_attr);
244	device_remove_file(&pdev->dev, &dev_attr_name);
245	exit_free:
246	dev_set_drvdata(&pdev->dev, NULL);
247	kfree(data);
248	exit:
249	return err;
250	}
251
252	static void __devexit k8temp_remove(struct pci_dev *pdev)
253	{
254	struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
255
256	hwmon_device_unregister(data->class_dev);
257	device_remove_file(&pdev->dev,
258	&sensor_dev_attr_temp1_input.dev_attr);
259	device_remove_file(&pdev->dev,
260	&sensor_dev_attr_temp2_input.dev_attr);
261	device_remove_file(&pdev->dev,
262	&sensor_dev_attr_temp3_input.dev_attr);
263	device_remove_file(&pdev->dev,
264	&sensor_dev_attr_temp4_input.dev_attr);
265	device_remove_file(&pdev->dev, &dev_attr_name);
266	dev_set_drvdata(&pdev->dev, NULL);
267	kfree(data);
268	}
269
270	static struct pci_driver k8temp_driver = {
271	.name = "k8temp",
272	.id_table = k8temp_ids,
273	.probe = k8temp_probe,
274	.remove = __devexit_p(k8temp_remove),
275	};
276
277	static int __init k8temp_init(void)
278	{
279	return pci_register_driver(&k8temp_driver);
280	}
281
282	static void __exit k8temp_exit(void)
283	{
284	pci_unregister_driver(&k8temp_driver);
285	}
286
287	MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>");
288	MODULE_DESCRIPTION("AMD K8 core temperature monitor");
289	MODULE_LICENSE("GPL");
290
291	module_init(k8temp_init)
292	module_exit(k8temp_exit)