[net-next-2.6.git] / drivers / macintosh / windfarm_smu_sat.c

/*
 * Windfarm PowerMac thermal control.  SMU "satellite" controller sensors.
 *
 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
 *
 * Released under the terms of the GNU GPL v2.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <asm/prom.h>
#include <asm/smu.h>
#include <asm/pmac_low_i2c.h>

#include "windfarm.h"

#define VERSION "0.2"

#define DEBUG

#ifdef DEBUG
#define DBG(args...)	printk(args)
#else
#define DBG(args...)	do { } while(0)
#endif

/* If the cache is older than 800ms we'll refetch it */
#define MAX_AGE		msecs_to_jiffies(800)

struct wf_sat {
	int			nr;
	atomic_t		refcnt;
	struct mutex		mutex;
	unsigned long		last_read; /* jiffies when cache last updated */
	u8			cache[16];
	struct i2c_client	*i2c;
	struct device_node	*node;
};

static struct wf_sat *sats[2];

struct wf_sat_sensor {
	int		index;
	int		index2;		/* used for power sensors */
	int		shift;
	struct wf_sat	*sat;
	struct wf_sensor sens;
};

#define wf_to_sat(c)	container_of(c, struct wf_sat_sensor, sens)

struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
						  unsigned int *size)
{
	struct wf_sat *sat;
	int err;
	unsigned int i, len;
	u8 *buf;
	u8 data[4];

	/* TODO: Add the resulting partition to the device-tree */

	if (sat_id > 1 || (sat = sats[sat_id]) == NULL)
		return NULL;

	err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8);
	if (err) {
		printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
		return NULL;
	}

	err = i2c_smbus_read_word_data(sat->i2c, 9);
	if (err < 0) {
		printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
		return NULL;
	}
	len = err;
	if (len == 0) {
		printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
		return NULL;
	}

	len = le16_to_cpu(len);
	len = (len + 3) & ~3;
	buf = kmalloc(len, GFP_KERNEL);
	if (buf == NULL)
		return NULL;

	for (i = 0; i < len; i += 4) {
		err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
		if (err < 0) {
			printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
			       err);
			goto fail;
		}
		buf[i] = data[1];
		buf[i+1] = data[0];
		buf[i+2] = data[3];
		buf[i+3] = data[2];
	}
#ifdef DEBUG
	DBG(KERN_DEBUG "sat %d partition %x:", sat_id, id);
	for (i = 0; i < len; ++i)
		DBG(" %x", buf[i]);
	DBG("\n");
#endif

	if (size)
		*size = len;
	return (struct smu_sdbp_header *) buf;

 fail:
	kfree(buf);
	return NULL;
}
EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);

/* refresh the cache */
static int wf_sat_read_cache(struct wf_sat *sat)
{
	int err;

	err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
	if (err < 0)
		return err;
	sat->last_read = jiffies;
#ifdef LOTSA_DEBUG
	{
		int i;
		DBG(KERN_DEBUG "wf_sat_get: data is");
		for (i = 0; i < 16; ++i)
			DBG(" %.2x", sat->cache[i]);
		DBG("\n");
	}
#endif
	return 0;
}

static int wf_sat_get(struct wf_sensor *sr, s32 *value)
{
	struct wf_sat_sensor *sens = wf_to_sat(sr);
	struct wf_sat *sat = sens->sat;
	int i, err;
	s32 val;

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

	mutex_lock(&sat->mutex);
	if (time_after(jiffies, (sat->last_read + MAX_AGE))) {
		err = wf_sat_read_cache(sat);
		if (err)
			goto fail;
	}

	i = sens->index * 2;
	val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift;
	if (sens->index2 >= 0) {
		i = sens->index2 * 2;
		/* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */
		val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4;
	}

	*value = val;
	err = 0;

 fail:
	mutex_unlock(&sat->mutex);
	return err;
}

static void wf_sat_release(struct wf_sensor *sr)
{
	struct wf_sat_sensor *sens = wf_to_sat(sr);
	struct wf_sat *sat = sens->sat;

	if (atomic_dec_and_test(&sat->refcnt)) {
		if (sat->nr >= 0)
			sats[sat->nr] = NULL;
		kfree(sat);
	}
	kfree(sens);
}

static struct wf_sensor_ops wf_sat_ops = {
	.get_value	= wf_sat_get,
	.release	= wf_sat_release,
	.owner		= THIS_MODULE,
};

static struct i2c_driver wf_sat_driver;

static void wf_sat_create(struct i2c_adapter *adapter, struct device_node *dev)
{
	struct i2c_board_info info;
	struct i2c_client *client;
	const u32 *reg;
	u8 addr;

	reg = of_get_property(dev, "reg", NULL);
	if (reg == NULL)
		return;
	addr = *reg;
	DBG(KERN_DEBUG "wf_sat: creating sat at address %x\n", addr);

	memset(&info, 0, sizeof(struct i2c_board_info));
	info.addr = (addr >> 1) & 0x7f;
	info.platform_data = dev;
	strlcpy(info.type, "wf_sat", I2C_NAME_SIZE);

	client = i2c_new_device(adapter, &info);
	if (client == NULL) {
		printk(KERN_ERR "windfarm: failed to attach smu-sat to i2c\n");
		return;
	}

	/*
	 * Let i2c-core delete that device on driver removal.
	 * This is safe because i2c-core holds the core_lock mutex for us.
	 */
	list_add_tail(&client->detected, &wf_sat_driver.clients);
}

static int wf_sat_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device_node *dev = client->dev.platform_data;
	struct wf_sat *sat;
	struct wf_sat_sensor *sens;
	const u32 *reg;
	const char *loc, *type;
	u8 chip, core;
	struct device_node *child;
	int shift, cpu, index;
	char *name;
	int vsens[2], isens[2];

	sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
	if (sat == NULL)
		return -ENOMEM;
	sat->nr = -1;
	sat->node = of_node_get(dev);
	atomic_set(&sat->refcnt, 0);
	mutex_init(&sat->mutex);
	sat->i2c = client;
	i2c_set_clientdata(client, sat);

	vsens[0] = vsens[1] = -1;
	isens[0] = isens[1] = -1;
	child = NULL;
	while ((child = of_get_next_child(dev, child)) != NULL) {
		reg = of_get_property(child, "reg", NULL);
		type = of_get_property(child, "device_type", NULL);
		loc = of_get_property(child, "location", NULL);
		if (reg == NULL || loc == NULL)
			continue;

		/* the cooked sensors are between 0x30 and 0x37 */
		if (*reg < 0x30 || *reg > 0x37)
			continue;
		index = *reg - 0x30;

		/* expect location to be CPU [AB][01] ... */
		if (strncmp(loc, "CPU ", 4) != 0)
			continue;
		chip = loc[4] - 'A';
		core = loc[5] - '0';
		if (chip > 1 || core > 1) {
			printk(KERN_ERR "wf_sat_create: don't understand "
			       "location %s for %s\n", loc, child->full_name);
			continue;
		}
		cpu = 2 * chip + core;
		if (sat->nr < 0)
			sat->nr = chip;
		else if (sat->nr != chip) {
			printk(KERN_ERR "wf_sat_create: can't cope with "
			       "multiple CPU chips on one SAT (%s)\n", loc);
			continue;
		}

		if (strcmp(type, "voltage-sensor") == 0) {
			name = "cpu-voltage";
			shift = 4;
			vsens[core] = index;
		} else if (strcmp(type, "current-sensor") == 0) {
			name = "cpu-current";
			shift = 8;
			isens[core] = index;
		} else if (strcmp(type, "temp-sensor") == 0) {
			name = "cpu-temp";
			shift = 10;
		} else
			continue;	/* hmmm shouldn't happen */

		/* the +16 is enough for "cpu-voltage-n" */
		sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
		if (sens == NULL) {
			printk(KERN_ERR "wf_sat_create: couldn't create "
			       "%s sensor %d (no memory)\n", name, cpu);
			continue;
		}
		sens->index = index;
		sens->index2 = -1;
		sens->shift = shift;
		sens->sat = sat;
		atomic_inc(&sat->refcnt);
		sens->sens.ops = &wf_sat_ops;
		sens->sens.name = (char *) (sens + 1);
		snprintf(sens->sens.name, 16, "%s-%d", name, cpu);

		if (wf_register_sensor(&sens->sens)) {
			atomic_dec(&sat->refcnt);
			kfree(sens);
		}
	}

	/* make the power sensors */
	for (core = 0; core < 2; ++core) {
		if (vsens[core] < 0 || isens[core] < 0)
			continue;
		cpu = 2 * sat->nr + core;
		sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
		if (sens == NULL) {
			printk(KERN_ERR "wf_sat_create: couldn't create power "
			       "sensor %d (no memory)\n", cpu);
			continue;
		}
		sens->index = vsens[core];
		sens->index2 = isens[core];
		sens->shift = 0;
		sens->sat = sat;
		atomic_inc(&sat->refcnt);
		sens->sens.ops = &wf_sat_ops;
		sens->sens.name = (char *) (sens + 1);
		snprintf(sens->sens.name, 16, "cpu-power-%d", cpu);

		if (wf_register_sensor(&sens->sens)) {
			atomic_dec(&sat->refcnt);
			kfree(sens);
		}
	}

	if (sat->nr >= 0)
		sats[sat->nr] = sat;

	return 0;
}

static int wf_sat_attach(struct i2c_adapter *adapter)
{
	struct device_node *busnode, *dev = NULL;
	struct pmac_i2c_bus *bus;

	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)
		if (of_device_is_compatible(dev, "smu-sat"))
			wf_sat_create(adapter, dev);
	return 0;
}

static int wf_sat_remove(struct i2c_client *client)
{
	struct wf_sat *sat = i2c_get_clientdata(client);

	/* XXX TODO */

	sat->i2c = NULL;
	return 0;
}

static const struct i2c_device_id wf_sat_id[] = {
	{ "wf_sat", 0 },
	{ }
};

static struct i2c_driver wf_sat_driver = {
	.driver = {
		.name		= "wf_smu_sat",
	},
	.attach_adapter	= wf_sat_attach,
	.probe		= wf_sat_probe,
	.remove		= wf_sat_remove,
	.id_table	= wf_sat_id,
};

static int __init sat_sensors_init(void)
{
	return i2c_add_driver(&wf_sat_driver);
}

#if 0	/* uncomment when module_exit() below is uncommented */
static void __exit sat_sensors_exit(void)
{
	i2c_del_driver(&wf_sat_driver);
}
#endif

module_init(sat_sensors_init);
/*module_exit(sat_sensors_exit); Uncomment when cleanup is implemented */

MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
MODULE_LICENSE("GPL");
Commit	Line	Data
ac171c46 BH	1	/*
	2	* Windfarm PowerMac thermal control. SMU "satellite" controller sensors.
	3	*
	4	* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
	5	*
	6	* Released under the terms of the GNU GPL v2.
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/errno.h>
	11	#include <linux/kernel.h>
	12	#include <linux/slab.h>
	13	#include <linux/init.h>
	14	#include <linux/wait.h>
	15	#include <linux/i2c.h>
56783c5e	16	#include <linux/mutex.h>
ac171c46 BH	17	#include <asm/prom.h>
	18	#include <asm/smu.h>
	19	#include <asm/pmac_low_i2c.h>
	20
	21	#include "windfarm.h"
	22
	23	#define VERSION "0.2"
	24
	25	#define DEBUG
	26
	27	#ifdef DEBUG
	28	#define DBG(args...) printk(args)
	29	#else
	30	#define DBG(args...) do { } while(0)
	31	#endif
	32
	33	/* If the cache is older than 800ms we'll refetch it */
	34	#define MAX_AGE msecs_to_jiffies(800)
	35
	36	struct wf_sat {
	37	int nr;
	38	atomic_t refcnt;
56783c5e	39	struct mutex mutex;
ac171c46 BH	40	unsigned long last_read; /* jiffies when cache last updated */
ac171c46 BH	41	u8 cache[16];
351ca3e3	42	struct i2c_client *i2c;
ac171c46 BH	43	struct device_node *node;
	44	};
	45
	46	static struct wf_sat *sats[2];
	47
	48	struct wf_sat_sensor {
	49	int index;
	50	int index2; /* used for power sensors */
	51	int shift;
	52	struct wf_sat *sat;
	53	struct wf_sensor sens;
	54	};
	55
	56	#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens)
ac171c46	57
ac171c46 BH	58	struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
	59	unsigned int *size)
	60	{
	61	struct wf_sat *sat;
	62	int err;
	63	unsigned int i, len;
	64	u8 *buf;
	65	u8 data[4];
	66
	67	/* TODO: Add the resulting partition to the device-tree */
	68
	69	if (sat_id > 1 \|\| (sat = sats[sat_id]) == NULL)
	70	return NULL;
	71
351ca3e3	72	err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8);
ac171c46 BH	73	if (err) {
	74	printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
	75	return NULL;
	76	}
	77
351ca3e3	78	err = i2c_smbus_read_word_data(sat->i2c, 9);
2fd091f3	79	if (err < 0) {
ac171c46 BH	80	printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
	81	return NULL;
	82	}
2fd091f3	83	len = err;
ac171c46 BH	84	if (len == 0) {
	85	printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
	86	return NULL;
	87	}
	88
	89	len = le16_to_cpu(len);
	90	len = (len + 3) & ~3;
	91	buf = kmalloc(len, GFP_KERNEL);
	92	if (buf == NULL)
	93	return NULL;
	94
	95	for (i = 0; i < len; i += 4) {
351ca3e3	96	err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
4b2643d7	97	if (err < 0) {
ac171c46 BH	98	printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
	99	err);
	100	goto fail;
	101	}
	102	buf[i] = data[1];
	103	buf[i+1] = data[0];
	104	buf[i+2] = data[3];
	105	buf[i+3] = data[2];
	106	}
	107	#ifdef DEBUG
	108	DBG(KERN_DEBUG "sat %d partition %x:", sat_id, id);
	109	for (i = 0; i < len; ++i)
	110	DBG(" %x", buf[i]);
	111	DBG("\n");
	112	#endif
	113
	114	if (size)
	115	*size = len;
	116	return (struct smu_sdbp_header *) buf;
	117
	118	fail:
	119	kfree(buf);
	120	return NULL;
	121	}
9127dd1a	122	EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);
ac171c46 BH	123
	124	/* refresh the cache */
	125	static int wf_sat_read_cache(struct wf_sat *sat)
	126	{
	127	int err;
	128
351ca3e3	129	err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
4b2643d7	130	if (err < 0)
ac171c46 BH	131	return err;
	132	sat->last_read = jiffies;
	133	#ifdef LOTSA_DEBUG
	134	{
	135	int i;
	136	DBG(KERN_DEBUG "wf_sat_get: data is");
	137	for (i = 0; i < 16; ++i)
	138	DBG(" %.2x", sat->cache[i]);
	139	DBG("\n");
	140	}
	141	#endif
	142	return 0;
	143	}
	144
	145	static int wf_sat_get(struct wf_sensor sr, s32 value)
	146	{
	147	struct wf_sat_sensor *sens = wf_to_sat(sr);
	148	struct wf_sat *sat = sens->sat;
	149	int i, err;
	150	s32 val;
	151
351ca3e3	152	if (sat->i2c == NULL)
ac171c46 BH	153	return -ENODEV;
ac171c46 BH	154
56783c5e	155	mutex_lock(&sat->mutex);
ac171c46 BH	156	if (time_after(jiffies, (sat->last_read + MAX_AGE))) {
	157	err = wf_sat_read_cache(sat);
	158	if (err)
	159	goto fail;
	160	}
	161
	162	i = sens->index * 2;
	163	val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift;
	164	if (sens->index2 >= 0) {
	165	i = sens->index2 * 2;
	166	/* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */
	167	val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4;
	168	}
	169
	170	*value = val;
	171	err = 0;
	172
	173	fail:
56783c5e	174	mutex_unlock(&sat->mutex);
ac171c46 BH	175	return err;
	176	}
	177
	178	static void wf_sat_release(struct wf_sensor *sr)
	179	{
	180	struct wf_sat_sensor *sens = wf_to_sat(sr);
	181	struct wf_sat *sat = sens->sat;
	182
	183	if (atomic_dec_and_test(&sat->refcnt)) {
ac171c46 BH	184	if (sat->nr >= 0)
	185	sats[sat->nr] = NULL;
	186	kfree(sat);
	187	}
	188	kfree(sens);
	189	}
	190
	191	static struct wf_sensor_ops wf_sat_ops = {
	192	.get_value = wf_sat_get,
	193	.release = wf_sat_release,
	194	.owner = THIS_MODULE,
	195	};
	196
6f6b35e1 JD	197	static struct i2c_driver wf_sat_driver;
6f6b35e1 JD	198
ac171c46 BH	199	static void wf_sat_create(struct i2c_adapter adapter, struct device_node dev)
ac171c46 BH	200	{
351ca3e3 JD	201	struct i2c_board_info info;
	202	struct i2c_client *client;
	203	const u32 *reg;
	204	u8 addr;
	205
	206	reg = of_get_property(dev, "reg", NULL);
	207	if (reg == NULL)
	208	return;
	209	addr = *reg;
	210	DBG(KERN_DEBUG "wf_sat: creating sat at address %x\n", addr);
	211
	212	memset(&info, 0, sizeof(struct i2c_board_info));
	213	info.addr = (addr >> 1) & 0x7f;
	214	info.platform_data = dev;
	215	strlcpy(info.type, "wf_sat", I2C_NAME_SIZE);
	216
	217	client = i2c_new_device(adapter, &info);
	218	if (client == NULL) {
	219	printk(KERN_ERR "windfarm: failed to attach smu-sat to i2c\n");
	220	return;
	221	}
	222
	223	/*
	224	* Let i2c-core delete that device on driver removal.
	225	* This is safe because i2c-core holds the core_lock mutex for us.
	226	*/
6f6b35e1	227	list_add_tail(&client->detected, &wf_sat_driver.clients);
351ca3e3 JD	228	}
	229
	230	static int wf_sat_probe(struct i2c_client *client,
	231	const struct i2c_device_id *id)
	232	{
	233	struct device_node *dev = client->dev.platform_data;
ac171c46 BH	234	struct wf_sat *sat;
ac171c46 BH	235	struct wf_sat_sensor *sens;
018a3d1d JK	236	const u32 *reg;
018a3d1d JK	237	const char loc, type;
351ca3e3	238	u8 chip, core;
ac171c46 BH	239	struct device_node *child;
	240	int shift, cpu, index;
	241	char *name;
	242	int vsens[2], isens[2];
	243
ac171c46 BH	244	sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
ac171c46 BH	245	if (sat == NULL)
351ca3e3	246	return -ENOMEM;
ac171c46 BH	247	sat->nr = -1;
	248	sat->node = of_node_get(dev);
	249	atomic_set(&sat->refcnt, 0);
56783c5e	250	mutex_init(&sat->mutex);
351ca3e3 JD	251	sat->i2c = client;
351ca3e3 JD	252	i2c_set_clientdata(client, sat);
ac171c46 BH	253
	254	vsens[0] = vsens[1] = -1;
	255	isens[0] = isens[1] = -1;
	256	child = NULL;
	257	while ((child = of_get_next_child(dev, child)) != NULL) {
01b2726d SR	258	reg = of_get_property(child, "reg", NULL);
	259	type = of_get_property(child, "device_type", NULL);
	260	loc = of_get_property(child, "location", NULL);
ac171c46 BH	261	if (reg == NULL \|\| loc == NULL)
	262	continue;
	263
	264	/* the cooked sensors are between 0x30 and 0x37 */
	265	if (reg < 0x30 \|\| reg > 0x37)
	266	continue;
	267	index = *reg - 0x30;
	268
	269	/* expect location to be CPU [AB][01] ... */
	270	if (strncmp(loc, "CPU ", 4) != 0)
	271	continue;
	272	chip = loc[4] - 'A';
	273	core = loc[5] - '0';
	274	if (chip > 1 \|\| core > 1) {
	275	printk(KERN_ERR "wf_sat_create: don't understand "
	276	"location %s for %s\n", loc, child->full_name);
	277	continue;
	278	}
	279	cpu = 2 * chip + core;
	280	if (sat->nr < 0)
	281	sat->nr = chip;
	282	else if (sat->nr != chip) {
	283	printk(KERN_ERR "wf_sat_create: can't cope with "
	284	"multiple CPU chips on one SAT (%s)\n", loc);
	285	continue;
	286	}
	287
	288	if (strcmp(type, "voltage-sensor") == 0) {
	289	name = "cpu-voltage";
	290	shift = 4;
	291	vsens[core] = index;
	292	} else if (strcmp(type, "current-sensor") == 0) {
	293	name = "cpu-current";
	294	shift = 8;
	295	isens[core] = index;
	296	} else if (strcmp(type, "temp-sensor") == 0) {
	297	name = "cpu-temp";
	298	shift = 10;
	299	} else
	300	continue; /* hmmm shouldn't happen */
	301
	302	/* the +16 is enough for "cpu-voltage-n" */
	303	sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
	304	if (sens == NULL) {
	305	printk(KERN_ERR "wf_sat_create: couldn't create "
	306	"%s sensor %d (no memory)\n", name, cpu);
	307	continue;
	308	}
	309	sens->index = index;
	310	sens->index2 = -1;
	311	sens->shift = shift;
	312	sens->sat = sat;
	313	atomic_inc(&sat->refcnt);
	314	sens->sens.ops = &wf_sat_ops;
	315	sens->sens.name = (char *) (sens + 1);
	316	snprintf(sens->sens.name, 16, "%s-%d", name, cpu);
	317
	318	if (wf_register_sensor(&sens->sens)) {
	319	atomic_dec(&sat->refcnt);
	320	kfree(sens);
	321	}
	322	}
	323
	324	/* make the power sensors */
325	for (core = 0; core < 2; ++core) {
326	if (vsens[core] < 0 \|\| isens[core] < 0)
327	continue;
328	cpu = 2 * sat->nr + core;
329	sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
330	if (sens == NULL) {
331	printk(KERN_ERR "wf_sat_create: couldn't create power "
332	"sensor %d (no memory)\n", cpu);
333	continue;
334	}
335	sens->index = vsens[core];
336	sens->index2 = isens[core];
337	sens->shift = 0;
338	sens->sat = sat;
339	atomic_inc(&sat->refcnt);
340	sens->sens.ops = &wf_sat_ops;
341	sens->sens.name = (char *) (sens + 1);
342	snprintf(sens->sens.name, 16, "cpu-power-%d", cpu);
343
344	if (wf_register_sensor(&sens->sens)) {
345	atomic_dec(&sat->refcnt);
346	kfree(sens);
347	}
348	}
349
350	if (sat->nr >= 0)
351	sats[sat->nr] = sat;
352
351ca3e3	353	return 0;
ac171c46 BH	354	}
	355
	356	static int wf_sat_attach(struct i2c_adapter *adapter)
	357	{
	358	struct device_node busnode, dev = NULL;
	359	struct pmac_i2c_bus *bus;
	360
	361	bus = pmac_i2c_adapter_to_bus(adapter);
	362	if (bus == NULL)
	363	return -ENODEV;
	364	busnode = pmac_i2c_get_bus_node(bus);
	365
	366	while ((dev = of_get_next_child(busnode, dev)) != NULL)
55b61fec	367	if (of_device_is_compatible(dev, "smu-sat"))
ac171c46 BH	368	wf_sat_create(adapter, dev);
	369	return 0;
	370	}
	371
351ca3e3	372	static int wf_sat_remove(struct i2c_client *client)
ac171c46	373	{
351ca3e3	374	struct wf_sat *sat = i2c_get_clientdata(client);
ac171c46 BH	375
	376	/* XXX TODO */
	377
351ca3e3	378	sat->i2c = NULL;
ac171c46 BH	379	return 0;
	380	}
	381
351ca3e3 JD	382	static const struct i2c_device_id wf_sat_id[] = {
	383	{ "wf_sat", 0 },
	384	{ }
	385	};
	386
	387	static struct i2c_driver wf_sat_driver = {
	388	.driver = {
	389	.name = "wf_smu_sat",
	390	},
	391	.attach_adapter = wf_sat_attach,
	392	.probe = wf_sat_probe,
	393	.remove = wf_sat_remove,
	394	.id_table = wf_sat_id,
	395	};
	396
ac171c46 BH	397	static int __init sat_sensors_init(void)
ac171c46 BH	398	{
92e9a850	399	return i2c_add_driver(&wf_sat_driver);
ac171c46 BH	400	}
ac171c46 BH	401
a05afe91	402	#if 0 /* uncomment when module_exit() below is uncommented */
ac171c46 BH	403	static void __exit sat_sensors_exit(void)
	404	{
	405	i2c_del_driver(&wf_sat_driver);
	406	}
a05afe91	407	#endif
ac171c46 BH	408
	409	module_init(sat_sensors_init);
	410	/module_exit(sat_sensors_exit); Uncomment when cleanup is implemented /
	411
	412	MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
	413	MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
	414	MODULE_LICENSE("GPL");