[linux.git] / drivers / macintosh / windfarm_max6690_sensor.c

/*
 * Windfarm PowerMac thermal control.  MAX6690 sensor.
 *
 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <[email protected]>
 *
 * Use and redistribute under the terms of the GNU GPL v2.
 */
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <asm/prom.h>
#include <asm/pmac_low_i2c.h>

#include "windfarm.h"

#define VERSION "1.0"

/* This currently only exports the external temperature sensor,
   since that's all the control loops need. */

/* Some MAX6690 register numbers */
#define MAX6690_INTERNAL_TEMP	0
#define MAX6690_EXTERNAL_TEMP	1

struct wf_6690_sensor {
	struct i2c_client	*i2c;
	struct wf_sensor	sens;
};

#define wf_to_6690(x)	container_of((x), struct wf_6690_sensor, sens)

static int wf_max6690_get(struct wf_sensor *sr, s32 *value)
{
	struct wf_6690_sensor *max = wf_to_6690(sr);
	s32 data;

	if (max->i2c == NULL)
		return -ENODEV;

	/* chip gets initialized by firmware */
	data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP);
	if (data < 0)
		return data;
	*value = data << 16;
	return 0;
}

static void wf_max6690_release(struct wf_sensor *sr)
{
	struct wf_6690_sensor *max = wf_to_6690(sr);

	kfree(max);
}

static const struct wf_sensor_ops wf_max6690_ops = {
	.get_value	= wf_max6690_get,
	.release	= wf_max6690_release,
	.owner		= THIS_MODULE,
};

static int wf_max6690_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	const char *name, *loc;
	struct wf_6690_sensor *max;
	int rc;

	loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
	if (!loc) {
		dev_warn(&client->dev, "Missing hwsensor-location property!\n");
		return -ENXIO;
	}

	/*
	 * We only expose the external temperature register for
	 * now as this is all we need for our control loops
	 */
	if (!strcmp(loc, "BACKSIDE") || !strcmp(loc, "SYS CTRLR AMBIENT"))
		name = "backside-temp";
	else if (!strcmp(loc, "NB Ambient"))
		name = "north-bridge-temp";
	else if (!strcmp(loc, "GPU Ambient"))
		name = "gpu-temp";
	else
		return -ENXIO;

	max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
	if (max == NULL) {
		printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: "
		       "no memory\n");
		return -ENOMEM;
	}

	max->i2c = client;
	max->sens.name = name;
	max->sens.ops = &wf_max6690_ops;
	i2c_set_clientdata(client, max);

	rc = wf_register_sensor(&max->sens);
	if (rc)
		kfree(max);
	return rc;
}

static int wf_max6690_remove(struct i2c_client *client)
{
	struct wf_6690_sensor *max = i2c_get_clientdata(client);

	max->i2c = NULL;
	wf_unregister_sensor(&max->sens);

	return 0;
}

static const struct i2c_device_id wf_max6690_id[] = {
	{ "MAC,max6690", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wf_max6690_id);

static struct i2c_driver wf_max6690_driver = {
	.driver = {
		.name		= "wf_max6690",
	},
	.probe		= wf_max6690_probe,
	.remove		= wf_max6690_remove,
	.id_table	= wf_max6690_id,
};

module_i2c_driver(wf_max6690_driver);

MODULE_AUTHOR("Paul Mackerras <[email protected]>");
MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
MODULE_LICENSE("GPL");
Commit	Line	Data
ac171c46 BH	1	/*
	2	* Windfarm PowerMac thermal control. MAX6690 sensor.
	3	*
	4	* Copyright (C) 2005 Paul Mackerras, IBM Corp. <[email protected]>
	5	*
	6	* Use and redistribute under the terms of the GNU GPL v2.
	7	*/
	8	#include <linux/types.h>
	9	#include <linux/errno.h>
	10	#include <linux/kernel.h>
	11	#include <linux/init.h>
	12	#include <linux/slab.h>
	13	#include <linux/i2c.h>
ac171c46 BH	14	#include <asm/prom.h>
	15	#include <asm/pmac_low_i2c.h>
	16
	17	#include "windfarm.h"
	18
22b6d2ea	19	#define VERSION "1.0"
ac171c46 BH	20
	21	/* This currently only exports the external temperature sensor,
	22	since that's all the control loops need. */
	23
	24	/* Some MAX6690 register numbers */
	25	#define MAX6690_INTERNAL_TEMP 0
	26	#define MAX6690_EXTERNAL_TEMP 1
	27
	28	struct wf_6690_sensor {
351ca3e3	29	struct i2c_client *i2c;
ac171c46 BH	30	struct wf_sensor sens;
	31	};
	32
	33	#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
ac171c46 BH	34
	35	static int wf_max6690_get(struct wf_sensor sr, s32 value)
	36	{
	37	struct wf_6690_sensor *max = wf_to_6690(sr);
	38	s32 data;
	39
351ca3e3	40	if (max->i2c == NULL)
ac171c46 BH	41	return -ENODEV;
	42
	43	/* chip gets initialized by firmware */
351ca3e3	44	data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP);
ac171c46 BH	45	if (data < 0)
	46	return data;
	47	*value = data << 16;
	48	return 0;
	49	}
	50
	51	static void wf_max6690_release(struct wf_sensor *sr)
	52	{
	53	struct wf_6690_sensor *max = wf_to_6690(sr);
	54
ac171c46 BH	55	kfree(max);
	56	}
	57
de854e54	58	static const struct wf_sensor_ops wf_max6690_ops = {
ac171c46 BH	59	.get_value = wf_max6690_get,
	60	.release = wf_max6690_release,
	61	.owner = THIS_MODULE,
	62	};
	63
351ca3e3 JD	64	static int wf_max6690_probe(struct i2c_client *client,
351ca3e3 JD	65	const struct i2c_device_id *id)
ac171c46	66	{
22b6d2ea	67	const char name, loc;
ac171c46	68	struct wf_6690_sensor *max;
351ca3e3	69	int rc;
ac171c46	70
22b6d2ea BH	71	loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
	72	if (!loc) {
	73	dev_warn(&client->dev, "Missing hwsensor-location property!\n");
	74	return -ENXIO;
	75	}
	76
d839ba2a BH	77	/*
	78	* We only expose the external temperature register for
	79	* now as this is all we need for our control loops
	80	*/
	81	if (!strcmp(loc, "BACKSIDE") \|\| !strcmp(loc, "SYS CTRLR AMBIENT"))
22b6d2ea BH	82	name = "backside-temp";
	83	else if (!strcmp(loc, "NB Ambient"))
	84	name = "north-bridge-temp";
	85	else if (!strcmp(loc, "GPU Ambient"))
	86	name = "gpu-temp";
	87	else
	88	return -ENXIO;
	89
ac171c46 BH	90	max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
ac171c46 BH	91	if (max == NULL) {
351ca3e3 JD	92	printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: "
	93	"no memory\n");
	94	return -ENOMEM;
	95	}
	96
	97	max->i2c = client;
8bb61fe1	98	max->sens.name = name;
351ca3e3 JD	99	max->sens.ops = &wf_max6690_ops;
	100	i2c_set_clientdata(client, max);
	101
	102	rc = wf_register_sensor(&max->sens);
22b6d2ea	103	if (rc)
351ca3e3	104	kfree(max);
351ca3e3 JD	105	return rc;
	106	}
	107
351ca3e3	108	static int wf_max6690_remove(struct i2c_client *client)
ac171c46	109	{
351ca3e3	110	struct wf_6690_sensor *max = i2c_get_clientdata(client);
ac171c46	111
351ca3e3	112	max->i2c = NULL;
ac171c46 BH	113	wf_unregister_sensor(&max->sens);
	114
	115	return 0;
	116	}
	117
351ca3e3	118	static const struct i2c_device_id wf_max6690_id[] = {
22b6d2ea	119	{ "MAC,max6690", 0 },
351ca3e3 JD	120	{ }
351ca3e3 JD	121	};
22b6d2ea	122	MODULE_DEVICE_TABLE(i2c, wf_max6690_id);
351ca3e3 JD	123
	124	static struct i2c_driver wf_max6690_driver = {
	125	.driver = {
	126	.name = "wf_max6690",
	127	},
351ca3e3 JD	128	.probe = wf_max6690_probe,
	129	.remove = wf_max6690_remove,
	130	.id_table = wf_max6690_id,
	131	};
	132
f7fb862b	133	module_i2c_driver(wf_max6690_driver);
ac171c46 BH	134
	135	MODULE_AUTHOR("Paul Mackerras <[email protected]>");
	136	MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
	137	MODULE_LICENSE("GPL");