bbc_i2c: Convert to pure OF driver. (e21e245b) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/sbus/char/bbc_envctrl.c

+38 −83

Original line number	Original line	Diff line number	Diff line
	/* $Id: bbc_envctrl.c,v 1.4 2001/04/06 16:48:08 davem Exp $		/* bbc_envctrl.c: UltraSPARC-III environment control driver.
	* bbc_envctrl.c: UltraSPARC-III environment control driver.
	*		*
	* Copyright (C) 2001 David S. Miller (davem@redhat.com)		* Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)
	*/		*/

	#include <linux/kthread.h>		#include <linux/kthread.h>
	#include <linux/delay.h>		#include <linux/delay.h>
	#include <linux/kmod.h>		#include <linux/kmod.h>
	#include <linux/reboot.h>		#include <linux/reboot.h>
			#include <linux/of.h>
			#include <linux/of_device.h>
	#include <asm/oplib.h>		#include <asm/oplib.h>
	#include <asm/ebus.h>

	#include "bbc_i2c.h"		#include "bbc_i2c.h"
	#include "max1617.h"		#include "max1617.h"
	@@ -75,43 +75,8 @@ static struct temp_limits amb_temp_limits[2] = {
	{ 65, 55, 40, 5, -5, -10 },		{ 65, 55, 40, 5, -5, -10 },
	};		};

	enum fan_action { FAN_SLOWER, FAN_SAME, FAN_FASTER, FAN_FULLBLAST, FAN_STATE_MAX };		static LIST_HEAD(all_temps);
			static LIST_HEAD(all_fans);
	struct bbc_cpu_temperature {
	struct bbc_cpu_temperature *next;

	struct bbc_i2c_client *client;
	int index;

	/* Current readings, and history. */
	s8 curr_cpu_temp;
	s8 curr_amb_temp;
	s8 prev_cpu_temp;
	s8 prev_amb_temp;
	s8 avg_cpu_temp;
	s8 avg_amb_temp;

	int sample_tick;

	enum fan_action fan_todo[2];
	#define FAN_AMBIENT 0
	#define FAN_CPU 1
	};

	struct bbc_cpu_temperature *all_bbc_temps;

	struct bbc_fan_control {
	struct bbc_fan_control *next;

	struct bbc_i2c_client *client;
	int index;

	int psupply_fan_on;
	int cpu_fan_speed;
	int system_fan_speed;
	};

	struct bbc_fan_control *all_bbc_fans;

	#define CPU_FAN_REG 0xf0		#define CPU_FAN_REG 0xf0
	#define SYS_FAN_REG 0xf2		#define SYS_FAN_REG 0xf2
	@@ -330,7 +295,7 @@ static enum fan_action prioritize_fan_action(int which_fan)
	* recommend we do, and perform that action on all the		* recommend we do, and perform that action on all the
	* fans.		* fans.
	*/		*/
	for (tp = all_bbc_temps; tp; tp = tp->next) {		list_for_each_entry(tp, &all_temps, glob_list) {
	if (tp->fan_todo[which_fan] == FAN_FULLBLAST) {		if (tp->fan_todo[which_fan] == FAN_FULLBLAST) {
	decision = FAN_FULLBLAST;		decision = FAN_FULLBLAST;
	break;		break;
	@@ -439,7 +404,7 @@ static void fans_full_blast(void)
	/* Since we will not be monitoring things anymore, put		/* Since we will not be monitoring things anymore, put
	* the fans on full blast.		* the fans on full blast.
	*/		*/
	for (fp = all_bbc_fans; fp; fp = fp->next) {		list_for_each_entry(fp, &all_fans, glob_list) {
	fp->cpu_fan_speed = FAN_SPEED_MAX;		fp->cpu_fan_speed = FAN_SPEED_MAX;
	fp->system_fan_speed = FAN_SPEED_MAX;		fp->system_fan_speed = FAN_SPEED_MAX;
	fp->psupply_fan_on = 1;		fp->psupply_fan_on = 1;
	@@ -463,11 +428,11 @@ static int kenvctrld(void *__unused)
	if (kthread_should_stop())		if (kthread_should_stop())
	break;		break;

	for (tp = all_bbc_temps; tp; tp = tp->next) {		list_for_each_entry(tp, &all_temps, glob_list) {
	get_current_temps(tp);		get_current_temps(tp);
	analyze_temps(tp, &last_warning_jiffies);		analyze_temps(tp, &last_warning_jiffies);
	}		}
	for (fp = all_bbc_fans; fp; fp = fp->next)		list_for_each_entry(fp, &all_fans, glob_list)
	maybe_new_fan_speeds(fp);		maybe_new_fan_speeds(fp);
	}		}
	printk(KERN_INFO "bbc_envctrl: kenvctrld exiting...\n");		printk(KERN_INFO "bbc_envctrl: kenvctrld exiting...\n");
	@@ -477,7 +442,8 @@ static int kenvctrld(void *__unused)
	return 0;		return 0;
	}		}

	static void attach_one_temp(struct linux_ebus_child *echild, int temp_idx)		static void attach_one_temp(struct bbc_i2c_bus bp, struct of_device op,
			int temp_idx)
	{		{
	struct bbc_cpu_temperature *tp;		struct bbc_cpu_temperature *tp;

	@@ -485,20 +451,17 @@ static void attach_one_temp(struct linux_ebus_child *echild, int temp_idx)
	if (!tp)		if (!tp)
	return;		return;

	tp->client = bbc_i2c_attach(echild);		tp->client = bbc_i2c_attach(op);
	if (!tp->client) {		if (!tp->client) {
	kfree(tp);		kfree(tp);
	return;		return;
	}		}


	tp->index = temp_idx;		tp->index = temp_idx;
	{
	struct bbc_cpu_temperature **tpp = &all_bbc_temps;		list_add(&tp->glob_list, &all_temps);
	while (*tpp)		list_add(&tp->bp_list, &bp->temps);
	tpp = &((*tpp)->next);
	tp->next = NULL;
	*tpp = tp;
	}

	/* Tell it to convert once every 5 seconds, clear all cfg		/* Tell it to convert once every 5 seconds, clear all cfg
	* bits.		* bits.
	@@ -524,7 +487,8 @@ static void attach_one_temp(struct linux_ebus_child *echild, int temp_idx)
	tp->fan_todo[FAN_CPU] = FAN_SAME;		tp->fan_todo[FAN_CPU] = FAN_SAME;
	}		}

	static void attach_one_fan(struct linux_ebus_child *echild, int fan_idx)		static void attach_one_fan(struct bbc_i2c_bus bp, struct of_device op,
			int fan_idx)
	{		{
	struct bbc_fan_control *fp;		struct bbc_fan_control *fp;

	@@ -532,7 +496,7 @@ static void attach_one_fan(struct linux_ebus_child *echild, int fan_idx)
	if (!fp)		if (!fp)
	return;		return;

	fp->client = bbc_i2c_attach(echild);		fp->client = bbc_i2c_attach(op);
	if (!fp->client) {		if (!fp->client) {
	kfree(fp);		kfree(fp);
	return;		return;
	@@ -540,13 +504,8 @@ static void attach_one_fan(struct linux_ebus_child *echild, int fan_idx)

	fp->index = fan_idx;		fp->index = fan_idx;

	{		list_add(&fp->glob_list, &all_fans);
	struct bbc_fan_control **fpp = &all_bbc_fans;		list_add(&fp->bp_list, &bp->fans);
	while (*fpp)
	fpp = &((*fpp)->next);
	fp->next = NULL;
	*fpp = fp;
	}

	/* The i2c device controlling the fans is write-only.		/* The i2c device controlling the fans is write-only.
	* So the only way to keep track of the current power		* So the only way to keep track of the current power
	@@ -563,18 +522,18 @@ static void attach_one_fan(struct linux_ebus_child *echild, int fan_idx)
	set_fan_speeds(fp);		set_fan_speeds(fp);
	}		}

	int bbc_envctrl_init(void)		int bbc_envctrl_init(struct bbc_i2c_bus *bp)
	{		{
	struct linux_ebus_child *echild;		struct of_device *op;
	int temp_index = 0;		int temp_index = 0;
	int fan_index = 0;		int fan_index = 0;
	int devidx = 0;		int devidx = 0;

	while ((echild = bbc_i2c_getdev(devidx++)) != NULL) {		while ((op = bbc_i2c_getdev(devidx++)) != NULL) {
	if (!strcmp(echild->prom_node->name, "temperature"))		if (!strcmp(op->node->name, "temperature"))
	attach_one_temp(echild, temp_index++);		attach_one_temp(bp, op, temp_index++);
	if (!strcmp(echild->prom_node->name, "fan-control"))		if (!strcmp(op->node->name, "fan-control"))
	attach_one_fan(echild, fan_index++);		attach_one_fan(bp, op, fan_index++);
	}		}
	if (temp_index != 0 && fan_index != 0) {		if (temp_index != 0 && fan_index != 0) {
	kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");		kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
	@@ -597,26 +556,22 @@ static void destroy_one_fan(struct bbc_fan_control *fp)
	kfree(fp);		kfree(fp);
	}		}

	void bbc_envctrl_cleanup(void)		void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp)
	{		{
	struct bbc_cpu_temperature *tp;		struct bbc_cpu_temperature tp, tpos;
	struct bbc_fan_control *fp;		struct bbc_fan_control fp, fpos;

	kthread_stop(kenvctrld_task);		kthread_stop(kenvctrld_task);

	tp = all_bbc_temps;		list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {
	while (tp != NULL) {		list_del(&tp->bp_list);
	struct bbc_cpu_temperature *next = tp->next;		list_del(&tp->glob_list);
	destroy_one_temp(tp);		destroy_one_temp(tp);
	tp = next;
	}		}
	all_bbc_temps = NULL;

	fp = all_bbc_fans;		list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {
	while (fp != NULL) {		list_del(&fp->bp_list);
	struct bbc_fan_control *next = fp->next;		list_del(&fp->glob_list);
	destroy_one_fan(fp);		destroy_one_fan(fp);
	fp = next;
	}		}
	all_bbc_fans = NULL;
	}		}

drivers/sbus/char/bbc_i2c.c

+106 −161

Original line number	Original line	Diff line number	Diff line
	/* $Id: bbc_i2c.c,v 1.2 2001/04/02 09:59:08 davem Exp $		/* bbc_i2c.c: I2C low-level driver for BBC device on UltraSPARC-III
	* bbc_i2c.c: I2C low-level driver for BBC device on UltraSPARC-III
	* platforms.		* platforms.
	*		*
	* Copyright (C) 2001 David S. Miller (davem@redhat.com)		* Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)
	*/		*/

	#include <linux/module.h>		#include <linux/module.h>
	@@ -14,9 +13,8 @@
	#include <linux/delay.h>		#include <linux/delay.h>
	#include <linux/init.h>		#include <linux/init.h>
	#include <linux/interrupt.h>		#include <linux/interrupt.h>
	#include <asm/oplib.h>		#include <linux/of.h>
	#include <asm/ebus.h>		#include <linux/of_device.h>
	#include <asm/spitfire.h>
	#include <asm/bbc.h>		#include <asm/bbc.h>
	#include <asm/io.h>		#include <asm/io.h>

	@@ -53,54 +51,12 @@
	* The second controller also connects to the smartcard reader, if present.		* The second controller also connects to the smartcard reader, if present.
	*/		*/

	#define NUM_CHILDREN 8		static void set_device_claimage(struct bbc_i2c_bus bp, struct of_device op, int val)
	struct bbc_i2c_bus {
	struct bbc_i2c_bus *next;
	int index;
	spinlock_t lock;
	void __iomem *i2c_bussel_reg;
	void __iomem *i2c_control_regs;
	unsigned char own, clock;

	wait_queue_head_t wq;
	volatile int waiting;

	struct linux_ebus_device *bus_edev;
	struct {
	struct linux_ebus_child *device;
	int client_claimed;
	} devs[NUM_CHILDREN];
	};

	static struct bbc_i2c_bus *all_bbc_i2c;

	struct bbc_i2c_client {
	struct bbc_i2c_bus *bp;
	struct linux_ebus_child *echild;
	int bus;
	int address;
	};

	static int find_device(struct bbc_i2c_bus bp, struct linux_ebus_child echild)
	{		{
	int i;		int i;

	for (i = 0; i < NUM_CHILDREN; i++) {		for (i = 0; i < NUM_CHILDREN; i++) {
	if (bp->devs[i].device == echild) {		if (bp->devs[i].device == op) {
	if (bp->devs[i].client_claimed)
	return 0;
	return 1;
	}
	}
	return 0;
	}

	static void set_device_claimage(struct bbc_i2c_bus bp, struct linux_ebus_child echild, int val)
	{
	int i;

	for (i = 0; i < NUM_CHILDREN; i++) {
	if (bp->devs[i].device == echild) {
	bp->devs[i].client_claimed = val;		bp->devs[i].client_claimed = val;
	return;		return;
	}		}
	@@ -110,61 +66,47 @@ static void set_device_claimage(struct bbc_i2c_bus *bp, struct linux_ebus_child
	#define claim_device(BP,ECHILD) set_device_claimage(BP,ECHILD,1)		#define claim_device(BP,ECHILD) set_device_claimage(BP,ECHILD,1)
	#define release_device(BP,ECHILD) set_device_claimage(BP,ECHILD,0)		#define release_device(BP,ECHILD) set_device_claimage(BP,ECHILD,0)

	static struct bbc_i2c_bus find_bus_for_device(struct linux_ebus_child echild)		struct of_device bbc_i2c_getdev(struct bbc_i2c_bus bp, int index)
	{		{
	struct bbc_i2c_bus *bp = all_bbc_i2c;		struct of_device *op = NULL;
			int curidx = 0, i;
	while (bp != NULL) {
	if (find_device(bp, echild) != 0)
	break;
	bp = bp->next;
	}

	return bp;
	}

	struct linux_ebus_child *bbc_i2c_getdev(int index)
	{
	struct bbc_i2c_bus *bp = all_bbc_i2c;
	struct linux_ebus_child *echild = NULL;
	int curidx = 0;

	while (bp != NULL) {
	struct bbc_i2c_bus *next = bp->next;
	int i;

	for (i = 0; i < NUM_CHILDREN; i++) {		for (i = 0; i < NUM_CHILDREN; i++) {
	if (!(echild = bp->devs[i].device))		if (!(op = bp->devs[i].device))
	break;		break;
	if (curidx == index)		if (curidx == index)
	goto out;		goto out;
	echild = NULL;		op = NULL;
	curidx++;		curidx++;
	}		}
	bp = next;
	}
	out:		out:
	if (curidx == index)		if (curidx == index)
	return echild;		return op;
	return NULL;		return NULL;
	}		}

	struct bbc_i2c_client bbc_i2c_attach(struct linux_ebus_child echild)		struct bbc_i2c_client bbc_i2c_attach(struct bbc_i2c_bus bp, struct of_device *op)
	{		{
	struct bbc_i2c_bus *bp = find_bus_for_device(echild);
	struct bbc_i2c_client *client;		struct bbc_i2c_client *client;
			const u32 *reg;

	if (!bp)
	return NULL;
	client = kzalloc(sizeof(*client), GFP_KERNEL);		client = kzalloc(sizeof(*client), GFP_KERNEL);
	if (!client)		if (!client)
	return NULL;		return NULL;
	client->bp = bp;		client->bp = bp;
	client->echild = echild;		client->op = op;
	client->bus = echild->resource[0].start;
	client->address = echild->resource[1].start;

	claim_device(bp, echild);		reg = of_get_property(op->node, "reg", NULL);
			if (!reg) {
			kfree(client);
			return NULL;
			}

			client->bus = reg[0];
			client->address = reg[1];

			claim_device(bp, op);

	return client;		return client;
	}		}
	@@ -172,9 +114,9 @@ struct bbc_i2c_client bbc_i2c_attach(struct linux_ebus_child echild)
	void bbc_i2c_detach(struct bbc_i2c_client *client)		void bbc_i2c_detach(struct bbc_i2c_client *client)
	{		{
	struct bbc_i2c_bus *bp = client->bp;		struct bbc_i2c_bus *bp = client->bp;
	struct linux_ebus_child *echild = client->echild;		struct of_device *op = client->op;

	release_device(bp, echild);		release_device(bp, op);
	kfree(client);		kfree(client);
	}		}

	@@ -355,44 +297,43 @@ static void __init reset_one_i2c(struct bbc_i2c_bus *bp)
	writeb(I2C_PCF_IDLE, bp->i2c_control_regs + 0x0);		writeb(I2C_PCF_IDLE, bp->i2c_control_regs + 0x0);
	}		}

	static int __init attach_one_i2c(struct linux_ebus_device *edev, int index)		static struct bbc_i2c_bus * __init attach_one_i2c(struct of_device *op, int index)
	{		{
	struct bbc_i2c_bus *bp;		struct bbc_i2c_bus *bp;
	struct linux_ebus_child *echild;		struct device_node *dp;
	int entry;		int entry;

	bp = kzalloc(sizeof(*bp), GFP_KERNEL);		bp = kzalloc(sizeof(*bp), GFP_KERNEL);
	if (!bp)		if (!bp)
	return -ENOMEM;		return NULL;

	bp->i2c_control_regs = ioremap(edev->resource[0].start, 0x2);		bp->i2c_control_regs = of_ioremap(&op->resource[0], 0, 0x2, "bbc_i2c_regs");
	if (!bp->i2c_control_regs)		if (!bp->i2c_control_regs)
	goto fail;		goto fail;

	if (edev->num_addrs == 2) {		bp->i2c_bussel_reg = of_ioremap(&op->resource[1], 0, 0x1, "bbc_i2c_bussel");
	bp->i2c_bussel_reg = ioremap(edev->resource[1].start, 0x1);
	if (!bp->i2c_bussel_reg)		if (!bp->i2c_bussel_reg)
	goto fail;		goto fail;
	}

	bp->waiting = 0;		bp->waiting = 0;
	init_waitqueue_head(&bp->wq);		init_waitqueue_head(&bp->wq);
	if (request_irq(edev->irqs[0], bbc_i2c_interrupt,		if (request_irq(op->irqs[0], bbc_i2c_interrupt,
	IRQF_SHARED, "bbc_i2c", bp))		IRQF_SHARED, "bbc_i2c", bp))
	goto fail;		goto fail;

	bp->index = index;		bp->index = index;
	bp->bus_edev = edev;		bp->op = op;

	spin_lock_init(&bp->lock);		spin_lock_init(&bp->lock);
	bp->next = all_bbc_i2c;
	all_bbc_i2c = bp;

	entry = 0;		entry = 0;
	for (echild = edev->children;		for (dp = op->node->child;
	echild && entry < 8;		dp && entry < 8;
	echild = echild->next, entry++) {		dp = dp->sibling, entry++) {
	bp->devs[entry].device = echild;		struct of_device *child_op;

			child_op = of_find_device_by_node(dp);
			bp->devs[entry].device = child_op;
	bp->devs[entry].client_claimed = 0;		bp->devs[entry].client_claimed = 0;
	}		}

	@@ -406,86 +347,90 @@ static int __init attach_one_i2c(struct linux_ebus_device *edev, int index)

	reset_one_i2c(bp);		reset_one_i2c(bp);

	return 0;		return bp;

	fail:		fail:
	if (bp->i2c_bussel_reg)		if (bp->i2c_bussel_reg)
	iounmap(bp->i2c_bussel_reg);		of_iounmap(&op->resource[1], bp->i2c_bussel_reg, 1);
	if (bp->i2c_control_regs)		if (bp->i2c_control_regs)
	iounmap(bp->i2c_control_regs);		of_iounmap(&op->resource[0], bp->i2c_control_regs, 2);
	kfree(bp);		kfree(bp);
	return -EINVAL;		return NULL;
	}

	static int __init bbc_present(void)
	{
	struct linux_ebus *ebus = NULL;
	struct linux_ebus_device *edev = NULL;

	for_each_ebus(ebus) {
	for_each_ebusdev(edev, ebus) {
	if (!strcmp(edev->prom_node->name, "bbc"))
	return 1;
	}
	}
	return 0;
	}		}

	extern int bbc_envctrl_init(void);		extern int bbc_envctrl_init(struct bbc_i2c_bus *bp);
	extern void bbc_envctrl_cleanup(void);		extern void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp);
	static void bbc_i2c_cleanup(void);

	static int __init bbc_i2c_init(void)		static int __devinit bbc_i2c_probe(struct of_device *op,
			const struct of_device_id *match)
	{		{
	struct linux_ebus *ebus = NULL;		struct bbc_i2c_bus *bp;
	struct linux_ebus_device *edev = NULL;
	int err, index = 0;		int err, index = 0;

	if ((tlb_type != cheetah && tlb_type != cheetah_plus) \|\|		bp = attach_one_i2c(op, index);
	!bbc_present())		if (!bp)
	return -ENODEV;		return -EINVAL;

	for_each_ebus(ebus) {		err = bbc_envctrl_init(bp);
	for_each_ebusdev(edev, ebus) {		if (err) {
	if (!strcmp(edev->prom_node->name, "i2c")) {		free_irq(op->irqs[0], bp);
	if (!attach_one_i2c(edev, index))		if (bp->i2c_bussel_reg)
	index++;		of_iounmap(&op->resource[0], bp->i2c_bussel_reg, 1);
	}		if (bp->i2c_control_regs)
	}		of_iounmap(&op->resource[1], bp->i2c_control_regs, 2);
			kfree(bp);
			} else {
			dev_set_drvdata(&op->dev, bp);
	}		}

	if (!index)
	return -ENODEV;

	err = bbc_envctrl_init();
	if (err)
	bbc_i2c_cleanup();
	return err;		return err;
	}		}

	static void bbc_i2c_cleanup(void)		static int __devexit bbc_i2c_remove(struct of_device *op)
	{		{
	struct bbc_i2c_bus *bp = all_bbc_i2c;		struct bbc_i2c_bus *bp = dev_get_drvdata(&op->dev);

	bbc_envctrl_cleanup();

	while (bp != NULL) {		bbc_envctrl_cleanup(bp);
	struct bbc_i2c_bus *next = bp->next;

	free_irq(bp->bus_edev->irqs[0], bp);		free_irq(op->irqs[0], bp);

	if (bp->i2c_bussel_reg)		if (bp->i2c_bussel_reg)
	iounmap(bp->i2c_bussel_reg);		of_iounmap(&op->resource[0], bp->i2c_bussel_reg, 1);
	if (bp->i2c_control_regs)		if (bp->i2c_control_regs)
	iounmap(bp->i2c_control_regs);		of_iounmap(&op->resource[1], bp->i2c_control_regs, 2);

	kfree(bp);		kfree(bp);

	bp = next;		return 0;
			}

			static struct of_device_id bbc_i2c_match[] = {
			{
			.name = "i2c",
			.compatible = "SUNW,bbc-i2c",
			},
			{},
			};
			MODULE_DEVICE_TABLE(of, bbc_i2c_match);

			static struct of_platform_driver bbc_i2c_driver = {
			.name = "bbc_i2c",
			.match_table = bbc_i2c_match,
			.probe = bbc_i2c_probe,
			.remove = __devexit_p(bbc_i2c_remove),
			};

			static int __init bbc_i2c_init(void)
			{
			return of_register_driver(&bbc_i2c_driver, &of_bus_type);
	}		}
	all_bbc_i2c = NULL;
			static void __exit bbc_i2c_exit(void)
			{
			of_unregister_driver(&bbc_i2c_driver);
	}		}

	module_init(bbc_i2c_init);		module_init(bbc_i2c_init);
	module_exit(bbc_i2c_cleanup);		module_exit(bbc_i2c_exit);

	MODULE_LICENSE("GPL");		MODULE_LICENSE("GPL");

drivers/sbus/char/bbc_i2c.h

+70 −5

Original line number	Original line	Diff line number	Diff line
	/* $Id: bbc_i2c.h,v 1.2 2001/04/02 09:59:25 davem Exp $ */
	#ifndef _BBC_I2C_H		#ifndef _BBC_I2C_H
	#define _BBC_I2C_H		#define _BBC_I2C_H

	#include <asm/ebus.h>		#include <linux/of.h>
			#include <linux/of_device.h>
			#include <linux/list.h>

	struct bbc_i2c_client;		struct bbc_i2c_client {
			struct bbc_i2c_bus *bp;
			struct of_device *op;
			int bus;
			int address;
			};

			enum fan_action { FAN_SLOWER, FAN_SAME, FAN_FASTER, FAN_FULLBLAST, FAN_STATE_MAX };

			struct bbc_cpu_temperature {
			struct list_head bp_list;
			struct list_head glob_list;

			struct bbc_i2c_client *client;
			int index;

			/* Current readings, and history. */
			s8 curr_cpu_temp;
			s8 curr_amb_temp;
			s8 prev_cpu_temp;
			s8 prev_amb_temp;
			s8 avg_cpu_temp;
			s8 avg_amb_temp;

			int sample_tick;

			enum fan_action fan_todo[2];
			#define FAN_AMBIENT 0
			#define FAN_CPU 1
			};

			struct bbc_fan_control {
			struct list_head bp_list;
			struct list_head glob_list;

			struct bbc_i2c_client *client;
			int index;

			int psupply_fan_on;
			int cpu_fan_speed;
			int system_fan_speed;
			};

			#define NUM_CHILDREN 8

			struct bbc_i2c_bus {
			struct bbc_i2c_bus *next;
			int index;
			spinlock_t lock;
			void __iomem *i2c_bussel_reg;
			void __iomem *i2c_control_regs;
			unsigned char own, clock;

			wait_queue_head_t wq;
			volatile int waiting;

			struct list_head temps;
			struct list_head fans;

			struct of_device *op;
			struct {
			struct of_device *device;
			int client_claimed;
			} devs[NUM_CHILDREN];
			};

	/* Probing and attachment. */		/* Probing and attachment. */
	extern struct linux_ebus_child *bbc_i2c_getdev(int);		extern struct of_device bbc_i2c_getdev(struct bbc_i2c_bus , int);
	extern struct bbc_i2c_client bbc_i2c_attach(struct linux_ebus_child );		extern struct bbc_i2c_client bbc_i2c_attach(struct bbc_i2c_bus bp, struct of_device *);
	extern void bbc_i2c_detach(struct bbc_i2c_client *);		extern void bbc_i2c_detach(struct bbc_i2c_client *);

	/* Register read/write. NOTE: Blocking! */		/* Register read/write. NOTE: Blocking! */