drivers/macintosh/windfarm_smu_sat.c - linux - Git at Google

 /*
  * 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 "1.0"

 #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 {
 	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];
 	}
 #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_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 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, *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);
 	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;
 	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;
 		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 struct i2c_driver wf_sat_driver = {
 	.driver = {
 		.name		= "wf_smu_sat",
 	},
 	.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");
	/*
	* 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 "1.0"

	#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 {
	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];
	}
	#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_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 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, 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);
	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;
	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;
	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 struct i2c_driver wf_sat_driver = {
	.driver = {
	.name = "wf_smu_sat",
	},
	.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");