[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 "0.2"

/* 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)
#define i2c_to_6690(x)	container_of((x), struct wf_6690_sensor, i2c)

static int wf_max6690_attach(struct i2c_adapter *adapter);
static int wf_max6690_detach(struct i2c_client *client);

static struct i2c_driver wf_max6690_driver = {
	.driver = {
		.name		= "wf_max6690",
	},
	.attach_adapter	= wf_max6690_attach,
	.detach_client	= wf_max6690_detach,
};

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.adapter == 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);

	if (max->i2c.adapter) {
		i2c_detach_client(&max->i2c);
		max->i2c.adapter = NULL;
	}
	kfree(max);
}

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

static void wf_max6690_create(struct i2c_adapter *adapter, u8 addr,
			      const char *loc)
{
	struct wf_6690_sensor *max;
	char *name;

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

	if (!strcmp(loc, "BACKSIDE"))
		name = "backside-temp";
	else if (!strcmp(loc, "NB Ambient"))
		name = "north-bridge-temp";
	else if (!strcmp(loc, "GPU Ambient"))
		name = "gpu-temp";
	else
		goto fail;

	max->sens.ops = &wf_max6690_ops;
	max->sens.name = name;
	max->i2c.addr = addr >> 1;
	max->i2c.adapter = adapter;
	max->i2c.driver = &wf_max6690_driver;
	strncpy(max->i2c.name, name, I2C_NAME_SIZE-1);

	if (i2c_attach_client(&max->i2c)) {
		printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n");
		goto fail;
	}

	if (wf_register_sensor(&max->sens)) {
		i2c_detach_client(&max->i2c);
		goto fail;
	}

	return;

 fail:
	kfree(max);
}

static int wf_max6690_attach(struct i2c_adapter *adapter)
{
	struct device_node *busnode, *dev = NULL;
	struct pmac_i2c_bus *bus;
	const char *loc;

	bus = pmac_i2c_adapter_to_bus(adapter);
	if (bus == NULL)
		return -ENODEV;
	busnode = pmac_i2c_get_bus_node(bus);

	while ((dev = of_get_next_child(busnode, dev)) != NULL) {
		u8 addr;

		/* We must re-match the adapter in order to properly check
		 * the channel on multibus setups
		 */
		if (!pmac_i2c_match_adapter(dev, adapter))
			continue;
		if (!of_device_is_compatible(dev, "max6690"))
			continue;
		addr = pmac_i2c_get_dev_addr(dev);
		loc = of_get_property(dev, "hwsensor-location", NULL);
		if (loc == NULL || addr == 0)
			continue;
		printk("found max6690, loc=%s addr=0x%02x\n", loc, addr);
		wf_max6690_create(adapter, addr, loc);
	}

	return 0;
}

static int wf_max6690_detach(struct i2c_client *client)
{
	struct wf_6690_sensor *max = i2c_to_6690(client);

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

	return 0;
}

static int __init wf_max6690_sensor_init(void)
{
	/* Don't register on old machines that use therm_pm72 for now */
	if (machine_is_compatible("PowerMac7,2") ||
	    machine_is_compatible("PowerMac7,3") ||
	    machine_is_compatible("RackMac3,1"))
		return -ENODEV;
	return i2c_add_driver(&wf_max6690_driver);
}

static void __exit wf_max6690_sensor_exit(void)
{
	i2c_del_driver(&wf_max6690_driver);
}

module_init(wf_max6690_sensor_init);
module_exit(wf_max6690_sensor_exit);

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
b55fafc5	19	#define VERSION "0.2"
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 {
	29	struct i2c_client i2c;
	30	struct wf_sensor sens;
	31	};
	32
	33	#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
	34	#define i2c_to_6690(x) container_of((x), struct wf_6690_sensor, i2c)
	35
	36	static int wf_max6690_attach(struct i2c_adapter *adapter);
	37	static int wf_max6690_detach(struct i2c_client *client);
	38
	39	static struct i2c_driver wf_max6690_driver = {
	40	.driver = {
	41	.name = "wf_max6690",
	42	},
	43	.attach_adapter = wf_max6690_attach,
	44	.detach_client = wf_max6690_detach,
	45	};
	46
	47	static int wf_max6690_get(struct wf_sensor sr, s32 value)
	48	{
	49	struct wf_6690_sensor *max = wf_to_6690(sr);
	50	s32 data;
	51
	52	if (max->i2c.adapter == NULL)
	53	return -ENODEV;
	54
	55	/* chip gets initialized by firmware */
	56	data = i2c_smbus_read_byte_data(&max->i2c, MAX6690_EXTERNAL_TEMP);
	57	if (data < 0)
	58	return data;
	59	*value = data << 16;
	60	return 0;
	61	}
	62
	63	static void wf_max6690_release(struct wf_sensor *sr)
	64	{
	65	struct wf_6690_sensor *max = wf_to_6690(sr);
	66
	67	if (max->i2c.adapter) {
	68	i2c_detach_client(&max->i2c);
	69	max->i2c.adapter = NULL;
	70	}
	71	kfree(max);
	72	}
	73
	74	static struct wf_sensor_ops wf_max6690_ops = {
	75	.get_value = wf_max6690_get,
	76	.release = wf_max6690_release,
	77	.owner = THIS_MODULE,
	78	};
	79
80ff974d ÉB	80	static void wf_max6690_create(struct i2c_adapter *adapter, u8 addr,
80ff974d ÉB	81	const char *loc)
ac171c46 BH	82	{
ac171c46 BH	83	struct wf_6690_sensor *max;
80ff974d	84	char *name;
ac171c46 BH	85
	86	max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
	87	if (max == NULL) {
	88	printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor %s: "
80ff974d	89	"no memory\n", loc);
ac171c46 BH	90	return;
	91	}
	92
80ff974d ÉB	93	if (!strcmp(loc, "BACKSIDE"))
	94	name = "backside-temp";
	95	else if (!strcmp(loc, "NB Ambient"))
	96	name = "north-bridge-temp";
	97	else if (!strcmp(loc, "GPU Ambient"))
	98	name = "gpu-temp";
	99	else
	100	goto fail;
	101
ac171c46 BH	102	max->sens.ops = &wf_max6690_ops;
	103	max->sens.name = name;
	104	max->i2c.addr = addr >> 1;
	105	max->i2c.adapter = adapter;
	106	max->i2c.driver = &wf_max6690_driver;
	107	strncpy(max->i2c.name, name, I2C_NAME_SIZE-1);
	108
	109	if (i2c_attach_client(&max->i2c)) {
	110	printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n");
	111	goto fail;
	112	}
	113
	114	if (wf_register_sensor(&max->sens)) {
	115	i2c_detach_client(&max->i2c);
	116	goto fail;
	117	}
	118
	119	return;
	120
	121	fail:
	122	kfree(max);
	123	}
	124
	125	static int wf_max6690_attach(struct i2c_adapter *adapter)
	126	{
	127	struct device_node busnode, dev = NULL;
	128	struct pmac_i2c_bus *bus;
	129	const char *loc;
ac171c46 BH	130
	131	bus = pmac_i2c_adapter_to_bus(adapter);
	132	if (bus == NULL)
	133	return -ENODEV;
	134	busnode = pmac_i2c_get_bus_node(bus);
	135
	136	while ((dev = of_get_next_child(busnode, dev)) != NULL) {
b55fafc5 BH	137	u8 addr;
	138
	139	/* We must re-match the adapter in order to properly check
	140	* the channel on multibus setups
	141	*/
	142	if (!pmac_i2c_match_adapter(dev, adapter))
	143	continue;
55b61fec	144	if (!of_device_is_compatible(dev, "max6690"))
ac171c46	145	continue;
b55fafc5	146	addr = pmac_i2c_get_dev_addr(dev);
01b2726d	147	loc = of_get_property(dev, "hwsensor-location", NULL);
b55fafc5	148	if (loc == NULL \|\| addr == 0)
ac171c46	149	continue;
b55fafc5	150	printk("found max6690, loc=%s addr=0x%02x\n", loc, addr);
80ff974d	151	wf_max6690_create(adapter, addr, loc);
ac171c46 BH	152	}
	153
	154	return 0;
	155	}
	156
	157	static int wf_max6690_detach(struct i2c_client *client)
	158	{
	159	struct wf_6690_sensor *max = i2c_to_6690(client);
	160
	161	max->i2c.adapter = NULL;
	162	wf_unregister_sensor(&max->sens);
	163
	164	return 0;
	165	}
	166
	167	static int __init wf_max6690_sensor_init(void)
	168	{
b55fafc5 BH	169	/* Don't register on old machines that use therm_pm72 for now */
	170	if (machine_is_compatible("PowerMac7,2") \|\|
	171	machine_is_compatible("PowerMac7,3") \|\|
	172	machine_is_compatible("RackMac3,1"))
	173	return -ENODEV;
ac171c46 BH	174	return i2c_add_driver(&wf_max6690_driver);
	175	}
	176
	177	static void __exit wf_max6690_sensor_exit(void)
	178	{
	179	i2c_del_driver(&wf_max6690_driver);
	180	}
	181
	182	module_init(wf_max6690_sensor_init);
	183	module_exit(wf_max6690_sensor_exit);
	184
	185	MODULE_AUTHOR("Paul Mackerras <[email protected]>");
	186	MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
	187	MODULE_LICENSE("GPL");