[mirror_ubuntu-jammy-kernel.git] / drivers / macintosh / windfarm_smu_sat.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Windfarm PowerMac thermal control.  SMU "satellite" controller sensors.
 *
 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
 */

#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 "1.0"

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

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

static struct wf_sat *sats[2];

struct wf_sat_sensor {
	struct list_head	link;
	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];
	}

	printk(KERN_DEBUG "sat %d partition %x:", sat_id, id);
	print_hex_dump(KERN_DEBUG, "  ", DUMP_PREFIX_OFFSET,
		       16, 1, buf, len, false);
	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;
		printk(KERN_DEBUG "wf_sat_get: data is");
		print_hex_dump(KERN_DEBUG, "  ", DUMP_PREFIX_OFFSET,
			       16, 1, sat->cache, 16, false);
	}
#endif
	return 0;
}

static int wf_sat_sensor_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 kref *ref)
{
	struct wf_sat *sat = container_of(ref, struct wf_sat, ref);

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

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

	kfree(sens);
	kref_put(&sat->ref, wf_sat_release);
}

static const struct wf_sensor_ops wf_sat_ops = {
	.get_value	= wf_sat_sensor_get,
	.release	= wf_sat_sensor_release,
	.owner		= THIS_MODULE,
};

static int wf_sat_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device_node *dev = client->dev.of_node;
	struct wf_sat *sat;
	struct wf_sat_sensor *sens;
	const u32 *reg;
	const char *loc;
	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);
	kref_init(&sat->ref);
	mutex_init(&sat->mutex);
	sat->i2c = client;
	INIT_LIST_HEAD(&sat->sensors);
	i2c_set_clientdata(client, sat);

	vsens[0] = vsens[1] = -1;
	isens[0] = isens[1] = -1;
	for_each_child_of_node(dev, child) {
		reg = of_get_property(child, "reg", 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 %pOF\n", loc, child);
			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 (of_node_is_type(child, "voltage-sensor")) {
			name = "cpu-voltage";
			shift = 4;
			vsens[core] = index;
		} else if (of_node_is_type(child, "current-sensor")) {
			name = "cpu-current";
			shift = 8;
			isens[core] = index;
		} else if (of_node_is_type(child, "temp-sensor")) {
			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;
		sens->sens.ops = &wf_sat_ops;
		sens->sens.name = (char *) (sens + 1);
		snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu);

		if (wf_register_sensor(&sens->sens))
			kfree(sens);
		else {
			list_add(&sens->link, &sat->sensors);
			kref_get(&sat->ref);
		}
	}

	/* 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;
		sens->sens.ops = &wf_sat_ops;
		sens->sens.name = (char *) (sens + 1);
		snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu);

		if (wf_register_sensor(&sens->sens))
			kfree(sens);
		else {
			list_add(&sens->link, &sat->sensors);
			kref_get(&sat->ref);
		}
	}

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

	return 0;
}

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

	/* release sensors */
	while(!list_empty(&sat->sensors)) {
		sens = list_first_entry(&sat->sensors,
					struct wf_sat_sensor, link);
		list_del(&sens->link);
		wf_unregister_sensor(&sens->sens);
	}
	sat->i2c = NULL;
	kref_put(&sat->ref, wf_sat_release);

	return 0;
}

static const struct i2c_device_id wf_sat_id[] = {
	{ "MAC,smu-sat", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wf_sat_id);

static const struct of_device_id wf_sat_of_id[] = {
	{ .compatible = "smu-sat", },
	{ }
};
MODULE_DEVICE_TABLE(of, wf_sat_of_id);

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

module_i2c_driver(wf_sat_driver);

MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
MODULE_LICENSE("GPL");
Commit	Line	Data
f7971183	1	// SPDX-License-Identifier: GPL-2.0-only
ac171c46 BH	2	/*
	3	* Windfarm PowerMac thermal control. SMU "satellite" controller sensors.
	4	*
	5	* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
ac171c46 BH	6	*/
	7
	8	#include <linux/types.h>
	9	#include <linux/errno.h>
	10	#include <linux/kernel.h>
	11	#include <linux/slab.h>
	12	#include <linux/init.h>
	13	#include <linux/wait.h>
	14	#include <linux/i2c.h>
56783c5e	15	#include <linux/mutex.h>
ac171c46 BH	16	#include <asm/prom.h>
	17	#include <asm/smu.h>
	18	#include <asm/pmac_low_i2c.h>
	19
	20	#include "windfarm.h"
	21
e326b30f	22	#define VERSION "1.0"
ac171c46	23
ac171c46 BH	24	/* If the cache is older than 800ms we'll refetch it */
	25	#define MAX_AGE msecs_to_jiffies(800)
	26
	27	struct wf_sat {
e326b30f	28	struct kref ref;
ac171c46	29	int nr;
56783c5e	30	struct mutex mutex;
ac171c46 BH	31	unsigned long last_read; /* jiffies when cache last updated */
ac171c46 BH	32	u8 cache[16];
e326b30f	33	struct list_head sensors;
351ca3e3	34	struct i2c_client *i2c;
ac171c46 BH	35	struct device_node *node;
	36	};
	37
	38	static struct wf_sat *sats[2];
	39
	40	struct wf_sat_sensor {
e326b30f BH	41	struct list_head link;
	42	int index;
	43	int index2; /* used for power sensors */
	44	int shift;
	45	struct wf_sat *sat;
	46	struct wf_sensor sens;
ac171c46 BH	47	};
	48
	49	#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens)
ac171c46	50
ac171c46 BH	51	struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
	52	unsigned int *size)
	53	{
	54	struct wf_sat *sat;
	55	int err;
	56	unsigned int i, len;
	57	u8 *buf;
	58	u8 data[4];
	59
	60	/* TODO: Add the resulting partition to the device-tree */
	61
	62	if (sat_id > 1 \|\| (sat = sats[sat_id]) == NULL)
	63	return NULL;
	64
351ca3e3	65	err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8);
ac171c46 BH	66	if (err) {
	67	printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
	68	return NULL;
	69	}
	70
351ca3e3	71	err = i2c_smbus_read_word_data(sat->i2c, 9);
2fd091f3	72	if (err < 0) {
ac171c46 BH	73	printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
	74	return NULL;
	75	}
2fd091f3	76	len = err;
ac171c46 BH	77	if (len == 0) {
	78	printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
	79	return NULL;
	80	}
	81
	82	len = le16_to_cpu(len);
	83	len = (len + 3) & ~3;
	84	buf = kmalloc(len, GFP_KERNEL);
	85	if (buf == NULL)
	86	return NULL;
	87
	88	for (i = 0; i < len; i += 4) {
351ca3e3	89	err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
4b2643d7	90	if (err < 0) {
ac171c46 BH	91	printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
	92	err);
	93	goto fail;
	94	}
	95	buf[i] = data[1];
	96	buf[i+1] = data[0];
	97	buf[i+2] = data[3];
	98	buf[i+3] = data[2];
	99	}
ac171c46	100
fc0c8b36 BH	101	printk(KERN_DEBUG "sat %d partition %x:", sat_id, id);
	102	print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET,
	103	16, 1, buf, len, false);
ac171c46 BH	104	if (size)
	105	*size = len;
	106	return (struct smu_sdbp_header *) buf;
	107
	108	fail:
	109	kfree(buf);
	110	return NULL;
	111	}
9127dd1a	112	EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);
ac171c46 BH	113
	114	/* refresh the cache */
	115	static int wf_sat_read_cache(struct wf_sat *sat)
	116	{
	117	int err;
	118
351ca3e3	119	err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
4b2643d7	120	if (err < 0)
ac171c46 BH	121	return err;
ac171c46 BH	122	sat->last_read = jiffies;
fc0c8b36	123
ac171c46 BH	124	#ifdef LOTSA_DEBUG
	125	{
	126	int i;
fc0c8b36 BH	127	printk(KERN_DEBUG "wf_sat_get: data is");
	128	print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET,
	129	16, 1, sat->cache, 16, false);
ac171c46 BH	130	}
	131	#endif
	132	return 0;
	133	}
	134
e326b30f	135	static int wf_sat_sensor_get(struct wf_sensor sr, s32 value)
ac171c46 BH	136	{
	137	struct wf_sat_sensor *sens = wf_to_sat(sr);
	138	struct wf_sat *sat = sens->sat;
	139	int i, err;
	140	s32 val;
	141
351ca3e3	142	if (sat->i2c == NULL)
ac171c46 BH	143	return -ENODEV;
ac171c46 BH	144
56783c5e	145	mutex_lock(&sat->mutex);
ac171c46 BH	146	if (time_after(jiffies, (sat->last_read + MAX_AGE))) {
	147	err = wf_sat_read_cache(sat);
	148	if (err)
	149	goto fail;
	150	}
	151
	152	i = sens->index * 2;
	153	val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift;
	154	if (sens->index2 >= 0) {
	155	i = sens->index2 * 2;
	156	/* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */
	157	val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4;
	158	}
	159
	160	*value = val;
	161	err = 0;
	162
	163	fail:
56783c5e	164	mutex_unlock(&sat->mutex);
ac171c46 BH	165	return err;
	166	}
	167
e326b30f BH	168	static void wf_sat_release(struct kref *ref)
	169	{
	170	struct wf_sat *sat = container_of(ref, struct wf_sat, ref);
	171
	172	if (sat->nr >= 0)
	173	sats[sat->nr] = NULL;
	174	kfree(sat);
	175	}
	176
	177	static void wf_sat_sensor_release(struct wf_sensor *sr)
ac171c46 BH	178	{
	179	struct wf_sat_sensor *sens = wf_to_sat(sr);
	180	struct wf_sat *sat = sens->sat;
	181
ac171c46	182	kfree(sens);
e326b30f	183	kref_put(&sat->ref, wf_sat_release);
ac171c46 BH	184	}
ac171c46 BH	185
de854e54	186	static const struct wf_sensor_ops wf_sat_ops = {
e326b30f BH	187	.get_value = wf_sat_sensor_get,
e326b30f BH	188	.release = wf_sat_sensor_release,
ac171c46 BH	189	.owner = THIS_MODULE,
	190	};
	191
351ca3e3 JD	192	static int wf_sat_probe(struct i2c_client *client,
	193	const struct i2c_device_id *id)
	194	{
9525a08b	195	struct device_node *dev = client->dev.of_node;
ac171c46 BH	196	struct wf_sat *sat;
ac171c46 BH	197	struct wf_sat_sensor *sens;
018a3d1d	198	const u32 *reg;
bf82d375	199	const char *loc;
351ca3e3	200	u8 chip, core;
ac171c46 BH	201	struct device_node *child;
	202	int shift, cpu, index;
	203	char *name;
	204	int vsens[2], isens[2];
	205
ac171c46 BH	206	sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
ac171c46 BH	207	if (sat == NULL)
351ca3e3	208	return -ENOMEM;
ac171c46 BH	209	sat->nr = -1;
ac171c46 BH	210	sat->node = of_node_get(dev);
e326b30f	211	kref_init(&sat->ref);
56783c5e	212	mutex_init(&sat->mutex);
351ca3e3	213	sat->i2c = client;
e326b30f	214	INIT_LIST_HEAD(&sat->sensors);
351ca3e3	215	i2c_set_clientdata(client, sat);
ac171c46 BH	216
	217	vsens[0] = vsens[1] = -1;
	218	isens[0] = isens[1] = -1;
8f7e57e8	219	for_each_child_of_node(dev, child) {
01b2726d	220	reg = of_get_property(child, "reg", NULL);
01b2726d	221	loc = of_get_property(child, "location", NULL);
ac171c46 BH	222	if (reg == NULL \|\| loc == NULL)
	223	continue;
	224
	225	/* the cooked sensors are between 0x30 and 0x37 */
	226	if (reg < 0x30 \|\| reg > 0x37)
	227	continue;
	228	index = *reg - 0x30;
	229
	230	/* expect location to be CPU [AB][01] ... */
	231	if (strncmp(loc, "CPU ", 4) != 0)
	232	continue;
	233	chip = loc[4] - 'A';
	234	core = loc[5] - '0';
	235	if (chip > 1 \|\| core > 1) {
	236	printk(KERN_ERR "wf_sat_create: don't understand "
b6a945ae	237	"location %s for %pOF\n", loc, child);
ac171c46 BH	238	continue;
	239	}
	240	cpu = 2 * chip + core;
	241	if (sat->nr < 0)
	242	sat->nr = chip;
	243	else if (sat->nr != chip) {
	244	printk(KERN_ERR "wf_sat_create: can't cope with "
	245	"multiple CPU chips on one SAT (%s)\n", loc);
	246	continue;
	247	}
	248
bf82d375	249	if (of_node_is_type(child, "voltage-sensor")) {
ac171c46 BH	250	name = "cpu-voltage";
	251	shift = 4;
	252	vsens[core] = index;
bf82d375	253	} else if (of_node_is_type(child, "current-sensor")) {
ac171c46 BH	254	name = "cpu-current";
	255	shift = 8;
	256	isens[core] = index;
bf82d375	257	} else if (of_node_is_type(child, "temp-sensor")) {
ac171c46 BH	258	name = "cpu-temp";
	259	shift = 10;
	260	} else
	261	continue; /* hmmm shouldn't happen */
	262
	263	/* the +16 is enough for "cpu-voltage-n" */
	264	sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
	265	if (sens == NULL) {
	266	printk(KERN_ERR "wf_sat_create: couldn't create "
	267	"%s sensor %d (no memory)\n", name, cpu);
	268	continue;
	269	}
	270	sens->index = index;
	271	sens->index2 = -1;
	272	sens->shift = shift;
	273	sens->sat = sat;
ac171c46 BH	274	sens->sens.ops = &wf_sat_ops;
ac171c46 BH	275	sens->sens.name = (char *) (sens + 1);
43671cc9	276	snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu);
ac171c46	277
e326b30f	278	if (wf_register_sensor(&sens->sens))
ac171c46	279	kfree(sens);
e326b30f BH	280	else {
	281	list_add(&sens->link, &sat->sensors);
	282	kref_get(&sat->ref);
ac171c46 BH	283	}
	284	}
	285
	286	/* make the power sensors */
	287	for (core = 0; core < 2; ++core) {
	288	if (vsens[core] < 0 \|\| isens[core] < 0)
	289	continue;
	290	cpu = 2 * sat->nr + core;
	291	sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
	292	if (sens == NULL) {
	293	printk(KERN_ERR "wf_sat_create: couldn't create power "
	294	"sensor %d (no memory)\n", cpu);
	295	continue;
	296	}
	297	sens->index = vsens[core];
	298	sens->index2 = isens[core];
	299	sens->shift = 0;
	300	sens->sat = sat;
ac171c46 BH	301	sens->sens.ops = &wf_sat_ops;
ac171c46 BH	302	sens->sens.name = (char *) (sens + 1);
43671cc9	303	snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu);
ac171c46	304
e326b30f	305	if (wf_register_sensor(&sens->sens))
ac171c46	306	kfree(sens);
e326b30f BH	307	else {
	308	list_add(&sens->link, &sat->sensors);
	309	kref_get(&sat->ref);
ac171c46 BH	310	}
	311	}
	312
	313	if (sat->nr >= 0)
	314	sats[sat->nr] = sat;
	315
351ca3e3	316	return 0;
ac171c46 BH	317	}
ac171c46 BH	318
351ca3e3	319	static int wf_sat_remove(struct i2c_client *client)
ac171c46	320	{
351ca3e3	321	struct wf_sat *sat = i2c_get_clientdata(client);
e326b30f	322	struct wf_sat_sensor *sens;
ac171c46	323
e326b30f BH	324	/* release sensors */
	325	while(!list_empty(&sat->sensors)) {
	326	sens = list_first_entry(&sat->sensors,
	327	struct wf_sat_sensor, link);
	328	list_del(&sens->link);
	329	wf_unregister_sensor(&sens->sens);
	330	}
351ca3e3	331	sat->i2c = NULL;
e326b30f BH	332	kref_put(&sat->ref, wf_sat_release);
e326b30f BH	333
ac171c46 BH	334	return 0;
	335	}
	336
351ca3e3	337	static const struct i2c_device_id wf_sat_id[] = {
e326b30f	338	{ "MAC,smu-sat", 0 },
351ca3e3 JD	339	{ }
351ca3e3 JD	340	};
e326b30f	341	MODULE_DEVICE_TABLE(i2c, wf_sat_id);
351ca3e3	342
bcf3588d WS	343	static const struct of_device_id wf_sat_of_id[] = {
	344	{ .compatible = "smu-sat", },
	345	{ }
	346	};
	347	MODULE_DEVICE_TABLE(of, wf_sat_of_id);
	348
351ca3e3 JD	349	static struct i2c_driver wf_sat_driver = {
	350	.driver = {
	351	.name = "wf_smu_sat",
bcf3588d	352	.of_match_table = wf_sat_of_id,
351ca3e3	353	},
351ca3e3 JD	354	.probe = wf_sat_probe,
	355	.remove = wf_sat_remove,
	356	.id_table = wf_sat_id,
	357	};
	358
f7fb862b	359	module_i2c_driver(wf_sat_driver);
ac171c46 BH	360
	361	MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
	362	MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
	363	MODULE_LICENSE("GPL");