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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Windfarm PowerMac thermal control.  MAX6690 sensor.
 *
 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
 */
#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 const struct of_device_id wf_max6690_of_id[] = {
	{ .compatible = "max6690", },
	{ }
};
MODULE_DEVICE_TABLE(of, wf_max6690_of_id);

static struct i2c_driver wf_max6690_driver = {
	.driver = {
		.name		= "wf_max6690",
		.of_match_table = wf_max6690_of_id,
	},
	.probe		= wf_max6690_probe,
	.remove		= wf_max6690_remove,
	.id_table	= wf_max6690_id,
};

module_i2c_driver(wf_max6690_driver);

MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
MODULE_LICENSE("GPL");
Commit	Line	Data
ddceed9d	1	// SPDX-License-Identifier: GPL-2.0-only
ac171c46 BH	2	/*
	3	* Windfarm PowerMac thermal control. MAX6690 sensor.
	4	*
	5	* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
ac171c46 BH	6	*/
	7	#include <linux/types.h>
	8	#include <linux/errno.h>
	9	#include <linux/kernel.h>
	10	#include <linux/init.h>
	11	#include <linux/slab.h>
	12	#include <linux/i2c.h>
ac171c46 BH	13	#include <asm/prom.h>
	14	#include <asm/pmac_low_i2c.h>
	15
	16	#include "windfarm.h"
	17
22b6d2ea	18	#define VERSION "1.0"
ac171c46 BH	19
	20	/* This currently only exports the external temperature sensor,
	21	since that's all the control loops need. */
	22
	23	/* Some MAX6690 register numbers */
	24	#define MAX6690_INTERNAL_TEMP 0
	25	#define MAX6690_EXTERNAL_TEMP 1
	26
	27	struct wf_6690_sensor {
351ca3e3	28	struct i2c_client *i2c;
ac171c46 BH	29	struct wf_sensor sens;
	30	};
	31
	32	#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
ac171c46 BH	33
	34	static int wf_max6690_get(struct wf_sensor sr, s32 value)
	35	{
	36	struct wf_6690_sensor *max = wf_to_6690(sr);
	37	s32 data;
	38
351ca3e3	39	if (max->i2c == NULL)
ac171c46 BH	40	return -ENODEV;
	41
	42	/* chip gets initialized by firmware */
351ca3e3	43	data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP);
ac171c46 BH	44	if (data < 0)
	45	return data;
	46	*value = data << 16;
	47	return 0;
	48	}
	49
	50	static void wf_max6690_release(struct wf_sensor *sr)
	51	{
	52	struct wf_6690_sensor *max = wf_to_6690(sr);
	53
ac171c46 BH	54	kfree(max);
	55	}
	56
de854e54	57	static const struct wf_sensor_ops wf_max6690_ops = {
ac171c46 BH	58	.get_value = wf_max6690_get,
	59	.release = wf_max6690_release,
	60	.owner = THIS_MODULE,
	61	};
	62
351ca3e3 JD	63	static int wf_max6690_probe(struct i2c_client *client,
351ca3e3 JD	64	const struct i2c_device_id *id)
ac171c46	65	{
22b6d2ea	66	const char name, loc;
ac171c46	67	struct wf_6690_sensor *max;
351ca3e3	68	int rc;
ac171c46	69
22b6d2ea BH	70	loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
	71	if (!loc) {
	72	dev_warn(&client->dev, "Missing hwsensor-location property!\n");
	73	return -ENXIO;
	74	}
	75
d839ba2a BH	76	/*
	77	* We only expose the external temperature register for
	78	* now as this is all we need for our control loops
	79	*/
	80	if (!strcmp(loc, "BACKSIDE") \|\| !strcmp(loc, "SYS CTRLR AMBIENT"))
22b6d2ea BH	81	name = "backside-temp";
	82	else if (!strcmp(loc, "NB Ambient"))
	83	name = "north-bridge-temp";
	84	else if (!strcmp(loc, "GPU Ambient"))
	85	name = "gpu-temp";
	86	else
	87	return -ENXIO;
	88
ac171c46 BH	89	max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
ac171c46 BH	90	if (max == NULL) {
351ca3e3 JD	91	printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: "
	92	"no memory\n");
	93	return -ENOMEM;
	94	}
	95
	96	max->i2c = client;
8bb61fe1	97	max->sens.name = name;
351ca3e3 JD	98	max->sens.ops = &wf_max6690_ops;
	99	i2c_set_clientdata(client, max);
	100
	101	rc = wf_register_sensor(&max->sens);
22b6d2ea	102	if (rc)
351ca3e3	103	kfree(max);
351ca3e3 JD	104	return rc;
	105	}
	106
351ca3e3	107	static int wf_max6690_remove(struct i2c_client *client)
ac171c46	108	{
351ca3e3	109	struct wf_6690_sensor *max = i2c_get_clientdata(client);
ac171c46	110
351ca3e3	111	max->i2c = NULL;
ac171c46 BH	112	wf_unregister_sensor(&max->sens);
	113
	114	return 0;
	115	}
	116
351ca3e3	117	static const struct i2c_device_id wf_max6690_id[] = {
22b6d2ea	118	{ "MAC,max6690", 0 },
351ca3e3 JD	119	{ }
351ca3e3 JD	120	};
22b6d2ea	121	MODULE_DEVICE_TABLE(i2c, wf_max6690_id);
351ca3e3	122
bcf3588d WS	123	static const struct of_device_id wf_max6690_of_id[] = {
	124	{ .compatible = "max6690", },
	125	{ }
	126	};
	127	MODULE_DEVICE_TABLE(of, wf_max6690_of_id);
	128
351ca3e3 JD	129	static struct i2c_driver wf_max6690_driver = {
	130	.driver = {
	131	.name = "wf_max6690",
bcf3588d	132	.of_match_table = wf_max6690_of_id,
351ca3e3	133	},
351ca3e3 JD	134	.probe = wf_max6690_probe,
	135	.remove = wf_max6690_remove,
	136	.id_table = wf_max6690_id,
	137	};
	138
f7fb862b	139	module_i2c_driver(wf_max6690_driver);
ac171c46 BH	140
	141	MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
	142	MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
	143	MODULE_LICENSE("GPL");