[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / macintosh / windfarm_smu_sensors.c

/*
 * Windfarm PowerMac thermal control. SMU based sensors
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 * Released under the term of the GNU GPL v2.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/smu.h>

#include "windfarm.h"

#define VERSION "0.2"

#undef DEBUG

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

/*
 * Various SMU "partitions" calibration objects for which we
 * keep pointers here for use by bits & pieces of the driver
 */
static struct smu_sdbp_cpuvcp *cpuvcp;
static int  cpuvcp_version;
static struct smu_sdbp_cpudiode *cpudiode;
static struct smu_sdbp_slotspow *slotspow;
static u8 *debugswitches;

/*
 * SMU basic sensors objects
 */

static LIST_HEAD(smu_ads);

struct smu_ad_sensor {
	struct list_head	link;
	u32			reg;		/* index in SMU */
	struct wf_sensor	sens;
};
#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)

static void smu_ads_release(struct wf_sensor *sr)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);

	kfree(ads);
}

static int smu_read_adc(u8 id, s32 *value)
{
	struct smu_simple_cmd	cmd;
	DECLARE_COMPLETION_ONSTACK(comp);
	int rc;

	rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
			      smu_done_complete, &comp, id);
	if (rc)
		return rc;
	wait_for_completion(&comp);
	if (cmd.cmd.status != 0)
		return cmd.cmd.status;
	if (cmd.cmd.reply_len != 2) {
		printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
		       id, cmd.cmd.reply_len);
		return -EIO;
	}
	*value = *((u16 *)cmd.buffer);
	return 0;
}

static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	int rc;
	s32 val;
	s64 scaled;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
	scaled >>= 3;
	scaled += ((s64)cpudiode->b_value) << 9;
	*value = (s32)(scaled << 1);

	return 0;
}

static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)cpuvcp->curr_scale);
	scaled += (s32)cpuvcp->curr_offset;
	*value = scaled << 4;

	return 0;
}

static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)cpuvcp->volt_scale);
	scaled += (s32)cpuvcp->volt_offset;
	*value = scaled << 4;

	return 0;
}

static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)slotspow->pow_scale);
	scaled += (s32)slotspow->pow_offset;
	*value = scaled << 4;

	return 0;
}


static struct wf_sensor_ops smu_cputemp_ops = {
	.get_value	= smu_cputemp_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_cpuamp_ops = {
	.get_value	= smu_cpuamp_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_cpuvolt_ops = {
	.get_value	= smu_cpuvolt_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_slotspow_ops = {
	.get_value	= smu_slotspow_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};


static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
{
	struct smu_ad_sensor *ads;
	const char *c, *l;
	const u32 *v;

	ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
	if (ads == NULL)
		return NULL;
	c = of_get_property(node, "device_type", NULL);
	l = of_get_property(node, "location", NULL);
	if (c == NULL || l == NULL)
		goto fail;

	/* We currently pick the sensors based on the OF name and location
	 * properties, while Darwin uses the sensor-id's.
	 * The problem with the IDs is that they are model specific while it
	 * looks like apple has been doing a reasonably good job at keeping
	 * the names and locations consistents so I'll stick with the names
	 * and locations for now.
	 */
	if (!strcmp(c, "temp-sensor") &&
	    !strcmp(l, "CPU T-Diode")) {
		ads->sens.ops = &smu_cputemp_ops;
		ads->sens.name = "cpu-temp";
		if (cpudiode == NULL) {
			DBG("wf: cpudiode partition (%02x) not found\n",
			    SMU_SDB_CPUDIODE_ID);
			goto fail;
		}
	} else if (!strcmp(c, "current-sensor") &&
		   !strcmp(l, "CPU Current")) {
		ads->sens.ops = &smu_cpuamp_ops;
		ads->sens.name = "cpu-current";
		if (cpuvcp == NULL) {
			DBG("wf: cpuvcp partition (%02x) not found\n",
			    SMU_SDB_CPUVCP_ID);
			goto fail;
		}
	} else if (!strcmp(c, "voltage-sensor") &&
		   !strcmp(l, "CPU Voltage")) {
		ads->sens.ops = &smu_cpuvolt_ops;
		ads->sens.name = "cpu-voltage";
		if (cpuvcp == NULL) {
			DBG("wf: cpuvcp partition (%02x) not found\n",
			    SMU_SDB_CPUVCP_ID);
			goto fail;
		}
	} else if (!strcmp(c, "power-sensor") &&
		   !strcmp(l, "Slots Power")) {
		ads->sens.ops = &smu_slotspow_ops;
		ads->sens.name = "slots-power";
		if (slotspow == NULL) {
			DBG("wf: slotspow partition (%02x) not found\n",
			    SMU_SDB_SLOTSPOW_ID);
			goto fail;
		}
	} else
		goto fail;

	v = of_get_property(node, "reg", NULL);
	if (v == NULL)
		goto fail;
	ads->reg = *v;

	if (wf_register_sensor(&ads->sens))
		goto fail;
	return ads;
 fail:
	kfree(ads);
	return NULL;
}

/*
 * SMU Power combo sensor object
 */

struct smu_cpu_power_sensor {
	struct list_head	link;
	struct wf_sensor	*volts;
	struct wf_sensor	*amps;
	int			fake_volts : 1;
	int			quadratic : 1;
	struct wf_sensor	sens;
};
#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)

static struct smu_cpu_power_sensor *smu_cpu_power;

static void smu_cpu_power_release(struct wf_sensor *sr)
{
	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);

	if (pow->volts)
		wf_put_sensor(pow->volts);
	if (pow->amps)
		wf_put_sensor(pow->amps);
	kfree(pow);
}

static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
	s32 volts, amps, power;
	u64 tmps, tmpa, tmpb;
	int rc;

	rc = pow->amps->ops->get_value(pow->amps, &amps);
	if (rc)
		return rc;

	if (pow->fake_volts) {
		*value = amps * 12 - 0x30000;
		return 0;
	}

	rc = pow->volts->ops->get_value(pow->volts, &volts);
	if (rc)
		return rc;

	power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
	if (!pow->quadratic) {
		*value = power;
		return 0;
	}
	tmps = (((u64)power) * ((u64)power)) >> 16;
	tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
	tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
	*value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);

	return 0;
}

static struct wf_sensor_ops smu_cpu_power_ops = {
	.get_value	= smu_cpu_power_get,
	.release	= smu_cpu_power_release,
	.owner		= THIS_MODULE,
};


static struct smu_cpu_power_sensor *
smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
{
	struct smu_cpu_power_sensor *pow;

	pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
	if (pow == NULL)
		return NULL;
	pow->sens.ops = &smu_cpu_power_ops;
	pow->sens.name = "cpu-power";

	wf_get_sensor(volts);
	pow->volts = volts;
	wf_get_sensor(amps);
	pow->amps = amps;

	/* Some early machines need a faked voltage */
	if (debugswitches && ((*debugswitches) & 0x80)) {
		printk(KERN_INFO "windfarm: CPU Power sensor using faked"
		       " voltage !\n");
		pow->fake_volts = 1;
	} else
		pow->fake_volts = 0;

	/* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
	 * I yet have to figure out what's up with 8,2 and will have to
	 * adjust for later, unless we can 100% trust the SDB partition...
	 */
	if ((of_machine_is_compatible("PowerMac8,1") ||
	     of_machine_is_compatible("PowerMac8,2") ||
	     of_machine_is_compatible("PowerMac9,1")) &&
	    cpuvcp_version >= 2) {
		pow->quadratic = 1;
		DBG("windfarm: CPU Power using quadratic transform\n");
	} else
		pow->quadratic = 0;

	if (wf_register_sensor(&pow->sens))
		goto fail;
	return pow;
 fail:
	kfree(pow);
	return NULL;
}

static void smu_fetch_param_partitions(void)
{
	const struct smu_sdbp_header *hdr;

	/* Get CPU voltage/current/power calibration data */
	hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
	if (hdr != NULL) {
		cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
		/* Keep version around */
		cpuvcp_version = hdr->version;
	}

	/* Get CPU diode calibration data */
	hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
	if (hdr != NULL)
		cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];

	/* Get slots power calibration data if any */
	hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
	if (hdr != NULL)
		slotspow = (struct smu_sdbp_slotspow *)&hdr[1];

	/* Get debug switches if any */
	hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
	if (hdr != NULL)
		debugswitches = (u8 *)&hdr[1];
}

static int __init smu_sensors_init(void)
{
	struct device_node *smu, *sensors, *s;
	struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;

	if (!smu_present())
		return -ENODEV;

	/* Get parameters partitions */
	smu_fetch_param_partitions();

	smu = of_find_node_by_type(NULL, "smu");
	if (smu == NULL)
		return -ENODEV;

	/* Look for sensors subdir */
	for (sensors = NULL;
	     (sensors = of_get_next_child(smu, sensors)) != NULL;)
		if (!strcmp(sensors->name, "sensors"))
			break;

	of_node_put(smu);

	/* Create basic sensors */
	for (s = NULL;
	     sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
		struct smu_ad_sensor *ads;

		ads = smu_ads_create(s);
		if (ads == NULL)
			continue;
		list_add(&ads->link, &smu_ads);
		/* keep track of cpu voltage & current */
		if (!strcmp(ads->sens.name, "cpu-voltage"))
			volt_sensor = ads;
		else if (!strcmp(ads->sens.name, "cpu-current"))
			curr_sensor = ads;
	}

	of_node_put(sensors);

	/* Create CPU power sensor if possible */
	if (volt_sensor && curr_sensor)
		smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
						     &curr_sensor->sens);

	return 0;
}

static void __exit smu_sensors_exit(void)
{
	struct smu_ad_sensor *ads;

	/* dispose of power sensor */
	if (smu_cpu_power)
		wf_unregister_sensor(&smu_cpu_power->sens);

	/* dispose of basic sensors */
	while (!list_empty(&smu_ads)) {
		ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
		list_del(&ads->link);
		wf_unregister_sensor(&ads->sens);
	}
}


module_init(smu_sensors_init);
module_exit(smu_sensors_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");
Commit	Line	Data
75722d39 BH	1	/*
	2	* Windfarm PowerMac thermal control. SMU based sensors
	3	*
	4	* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
	5	* <benh@kernel.crashing.org>
	6	*
	7	* Released under the term of the GNU GPL v2.
	8	*/
	9
	10	#include <linux/types.h>
	11	#include <linux/errno.h>
	12	#include <linux/kernel.h>
	13	#include <linux/delay.h>
	14	#include <linux/slab.h>
	15	#include <linux/init.h>
	16	#include <linux/wait.h>
de25968c	17	#include <linux/completion.h>
75722d39 BH	18	#include <asm/prom.h>
	19	#include <asm/machdep.h>
	20	#include <asm/io.h>
75722d39 BH	21	#include <asm/sections.h>
	22	#include <asm/smu.h>
	23
	24	#include "windfarm.h"
	25
	26	#define VERSION "0.2"
	27
	28	#undef DEBUG
	29
	30	#ifdef DEBUG
	31	#define DBG(args...) printk(args)
	32	#else
	33	#define DBG(args...) do { } while(0)
	34	#endif
	35
	36	/*
	37	* Various SMU "partitions" calibration objects for which we
	38	* keep pointers here for use by bits & pieces of the driver
	39	*/
	40	static struct smu_sdbp_cpuvcp *cpuvcp;
	41	static int cpuvcp_version;
	42	static struct smu_sdbp_cpudiode *cpudiode;
	43	static struct smu_sdbp_slotspow *slotspow;
	44	static u8 *debugswitches;
	45
	46	/*
	47	* SMU basic sensors objects
	48	*/
	49
	50	static LIST_HEAD(smu_ads);
	51
	52	struct smu_ad_sensor {
	53	struct list_head link;
	54	u32 reg; /* index in SMU */
	55	struct wf_sensor sens;
	56	};
	57	#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)
	58
	59	static void smu_ads_release(struct wf_sensor *sr)
	60	{
	61	struct smu_ad_sensor *ads = to_smu_ads(sr);
	62
	63	kfree(ads);
	64	}
	65
	66	static int smu_read_adc(u8 id, s32 *value)
	67	{
	68	struct smu_simple_cmd cmd;
6e9a4738	69	DECLARE_COMPLETION_ONSTACK(comp);
75722d39 BH	70	int rc;
	71
	72	rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
	73	smu_done_complete, &comp, id);
	74	if (rc)
	75	return rc;
	76	wait_for_completion(&comp);
	77	if (cmd.cmd.status != 0)
	78	return cmd.cmd.status;
	79	if (cmd.cmd.reply_len != 2) {
	80	printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
	81	id, cmd.cmd.reply_len);
	82	return -EIO;
	83	}
	84	value = ((u16 *)cmd.buffer);
	85	return 0;
	86	}
	87
	88	static int smu_cputemp_get(struct wf_sensor sr, s32 value)
	89	{
	90	struct smu_ad_sensor *ads = to_smu_ads(sr);
	91	int rc;
	92	s32 val;
	93	s64 scaled;
	94
	95	rc = smu_read_adc(ads->reg, &val);
	96	if (rc) {
	97	printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
	98	rc);
	99	return rc;
	100	}
	101
	102	/* Ok, we have to scale & adjust, taking units into account */
	103	scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
	104	scaled >>= 3;
	105	scaled += ((s64)cpudiode->b_value) << 9;
	106	*value = (s32)(scaled << 1);
	107
	108	return 0;
	109	}
	110
	111	static int smu_cpuamp_get(struct wf_sensor sr, s32 value)
	112	{
	113	struct smu_ad_sensor *ads = to_smu_ads(sr);
	114	s32 val, scaled;
	115	int rc;
	116
	117	rc = smu_read_adc(ads->reg, &val);
	118	if (rc) {
	119	printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
	120	rc);
	121	return rc;
	122	}
	123
	124	/* Ok, we have to scale & adjust, taking units into account */
	125	scaled = (s32)(val * (u32)cpuvcp->curr_scale);
	126	scaled += (s32)cpuvcp->curr_offset;
	127	*value = scaled << 4;
	128
	129	return 0;
	130	}
	131
	132	static int smu_cpuvolt_get(struct wf_sensor sr, s32 value)
	133	{
134	struct smu_ad_sensor *ads = to_smu_ads(sr);
135	s32 val, scaled;
136	int rc;
137
138	rc = smu_read_adc(ads->reg, &val);
139	if (rc) {
140	printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
141	rc);
142	return rc;
143	}
144
145	/* Ok, we have to scale & adjust, taking units into account */
146	scaled = (s32)(val * (u32)cpuvcp->volt_scale);
147	scaled += (s32)cpuvcp->volt_offset;
148	*value = scaled << 4;
149
150	return 0;
151	}
152
153	static int smu_slotspow_get(struct wf_sensor sr, s32 value)
154	{
155	struct smu_ad_sensor *ads = to_smu_ads(sr);
156	s32 val, scaled;
157	int rc;
158
159	rc = smu_read_adc(ads->reg, &val);
160	if (rc) {
161	printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
162	rc);
163	return rc;
164	}
165
166	/* Ok, we have to scale & adjust, taking units into account */
167	scaled = (s32)(val * (u32)slotspow->pow_scale);
168	scaled += (s32)slotspow->pow_offset;
169	*value = scaled << 4;
170
171	return 0;
172	}
173
174
175	static struct wf_sensor_ops smu_cputemp_ops = {
176	.get_value = smu_cputemp_get,
177	.release = smu_ads_release,
178	.owner = THIS_MODULE,
179	};
180	static struct wf_sensor_ops smu_cpuamp_ops = {
181	.get_value = smu_cpuamp_get,
182	.release = smu_ads_release,
183	.owner = THIS_MODULE,
184	};
185	static struct wf_sensor_ops smu_cpuvolt_ops = {
186	.get_value = smu_cpuvolt_get,
187	.release = smu_ads_release,
188	.owner = THIS_MODULE,
189	};
190	static struct wf_sensor_ops smu_slotspow_ops = {
191	.get_value = smu_slotspow_get,
192	.release = smu_ads_release,
193	.owner = THIS_MODULE,
194	};
195
196
197	static struct smu_ad_sensor smu_ads_create(struct device_node node)
198	{
199	struct smu_ad_sensor *ads;
018a3d1d JK	200	const char c, l;
018a3d1d JK	201	const u32 *v;
75722d39 BH	202
	203	ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
	204	if (ads == NULL)
	205	return NULL;
01b2726d SR	206	c = of_get_property(node, "device_type", NULL);
01b2726d SR	207	l = of_get_property(node, "location", NULL);
75722d39 BH	208	if (c == NULL \|\| l == NULL)
	209	goto fail;
	210
	211	/* We currently pick the sensors based on the OF name and location
	212	* properties, while Darwin uses the sensor-id's.
	213	* The problem with the IDs is that they are model specific while it
	214	* looks like apple has been doing a reasonably good job at keeping
	215	* the names and locations consistents so I'll stick with the names
	216	* and locations for now.
	217	*/
	218	if (!strcmp(c, "temp-sensor") &&
	219	!strcmp(l, "CPU T-Diode")) {
	220	ads->sens.ops = &smu_cputemp_ops;
	221	ads->sens.name = "cpu-temp";
ac171c46 BH	222	if (cpudiode == NULL) {
	223	DBG("wf: cpudiode partition (%02x) not found\n",
	224	SMU_SDB_CPUDIODE_ID);
	225	goto fail;
	226	}
75722d39 BH	227	} else if (!strcmp(c, "current-sensor") &&
	228	!strcmp(l, "CPU Current")) {
	229	ads->sens.ops = &smu_cpuamp_ops;
	230	ads->sens.name = "cpu-current";
ac171c46 BH	231	if (cpuvcp == NULL) {
	232	DBG("wf: cpuvcp partition (%02x) not found\n",
	233	SMU_SDB_CPUVCP_ID);
	234	goto fail;
	235	}
75722d39 BH	236	} else if (!strcmp(c, "voltage-sensor") &&
	237	!strcmp(l, "CPU Voltage")) {
	238	ads->sens.ops = &smu_cpuvolt_ops;
	239	ads->sens.name = "cpu-voltage";
ac171c46 BH	240	if (cpuvcp == NULL) {
	241	DBG("wf: cpuvcp partition (%02x) not found\n",
	242	SMU_SDB_CPUVCP_ID);
	243	goto fail;
	244	}
75722d39 BH	245	} else if (!strcmp(c, "power-sensor") &&
	246	!strcmp(l, "Slots Power")) {
	247	ads->sens.ops = &smu_slotspow_ops;
	248	ads->sens.name = "slots-power";
	249	if (slotspow == NULL) {
	250	DBG("wf: slotspow partition (%02x) not found\n",
	251	SMU_SDB_SLOTSPOW_ID);
	252	goto fail;
	253	}
	254	} else
	255	goto fail;
	256
01b2726d	257	v = of_get_property(node, "reg", NULL);
75722d39 BH	258	if (v == NULL)
	259	goto fail;
	260	ads->reg = *v;
	261
	262	if (wf_register_sensor(&ads->sens))
	263	goto fail;
	264	return ads;
	265	fail:
	266	kfree(ads);
	267	return NULL;
	268	}
	269
	270	/*
	271	* SMU Power combo sensor object
	272	*/
	273
	274	struct smu_cpu_power_sensor {
	275	struct list_head link;
	276	struct wf_sensor *volts;
	277	struct wf_sensor *amps;
	278	int fake_volts : 1;
	279	int quadratic : 1;
	280	struct wf_sensor sens;
	281	};
	282	#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
	283
	284	static struct smu_cpu_power_sensor *smu_cpu_power;
	285
	286	static void smu_cpu_power_release(struct wf_sensor *sr)
	287	{
	288	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
	289
	290	if (pow->volts)
	291	wf_put_sensor(pow->volts);
	292	if (pow->amps)
	293	wf_put_sensor(pow->amps);
	294	kfree(pow);
	295	}
	296
	297	static int smu_cpu_power_get(struct wf_sensor sr, s32 value)
	298	{
	299	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
	300	s32 volts, amps, power;
	301	u64 tmps, tmpa, tmpb;
	302	int rc;
	303
	304	rc = pow->amps->ops->get_value(pow->amps, &amps);
	305	if (rc)
	306	return rc;
	307
	308	if (pow->fake_volts) {
	309	value = amps 12 - 0x30000;
	310	return 0;
	311	}
	312
	313	rc = pow->volts->ops->get_value(pow->volts, &volts);
	314	if (rc)
	315	return rc;
	316
	317	power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
	318	if (!pow->quadratic) {
	319	*value = power;
	320	return 0;
	321	}
322	tmps = (((u64)power) * ((u64)power)) >> 16;
323	tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
324	tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
325	*value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);
326
327	return 0;
328	}
329
330	static struct wf_sensor_ops smu_cpu_power_ops = {
331	.get_value = smu_cpu_power_get,
332	.release = smu_cpu_power_release,
333	.owner = THIS_MODULE,
334	};
335
336
337	static struct smu_cpu_power_sensor *
338	smu_cpu_power_create(struct wf_sensor volts, struct wf_sensor amps)
339	{
340	struct smu_cpu_power_sensor *pow;
341
342	pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
343	if (pow == NULL)
344	return NULL;
345	pow->sens.ops = &smu_cpu_power_ops;
346	pow->sens.name = "cpu-power";
347
348	wf_get_sensor(volts);
349	pow->volts = volts;
350	wf_get_sensor(amps);
351	pow->amps = amps;
352
353	/* Some early machines need a faked voltage */
354	if (debugswitches && ((*debugswitches) & 0x80)) {
355	printk(KERN_INFO "windfarm: CPU Power sensor using faked"
356	" voltage !\n");
357	pow->fake_volts = 1;
358	} else
359	pow->fake_volts = 0;
360
361	/* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
362	* I yet have to figure out what's up with 8,2 and will have to
363	* adjust for later, unless we can 100% trust the SDB partition...
364	*/
71a157e8 GL	365	if ((of_machine_is_compatible("PowerMac8,1") \|\|
	366	of_machine_is_compatible("PowerMac8,2") \|\|
	367	of_machine_is_compatible("PowerMac9,1")) &&
75722d39 BH	368	cpuvcp_version >= 2) {
	369	pow->quadratic = 1;
	370	DBG("windfarm: CPU Power using quadratic transform\n");
	371	} else
	372	pow->quadratic = 0;
	373
	374	if (wf_register_sensor(&pow->sens))
	375	goto fail;
	376	return pow;
	377	fail:
	378	kfree(pow);
	379	return NULL;
	380	}
	381
ac171c46	382	static void smu_fetch_param_partitions(void)
75722d39	383	{
018a3d1d	384	const struct smu_sdbp_header *hdr;
75722d39 BH	385
	386	/* Get CPU voltage/current/power calibration data */
	387	hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
ac171c46 BH	388	if (hdr != NULL) {
	389	cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
	390	/* Keep version around */
	391	cpuvcp_version = hdr->version;
75722d39	392	}
75722d39 BH	393
	394	/* Get CPU diode calibration data */
	395	hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
ac171c46 BH	396	if (hdr != NULL)
ac171c46 BH	397	cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];
75722d39 BH	398
	399	/* Get slots power calibration data if any */
	400	hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
	401	if (hdr != NULL)
	402	slotspow = (struct smu_sdbp_slotspow *)&hdr[1];
	403
	404	/* Get debug switches if any */
	405	hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
	406	if (hdr != NULL)
	407	debugswitches = (u8 *)&hdr[1];
75722d39 BH	408	}
	409
	410	static int __init smu_sensors_init(void)
	411	{
	412	struct device_node smu, sensors, *s;
	413	struct smu_ad_sensor volt_sensor = NULL, curr_sensor = NULL;
75722d39 BH	414
	415	if (!smu_present())
	416	return -ENODEV;
	417
	418	/* Get parameters partitions */
ac171c46	419	smu_fetch_param_partitions();
75722d39 BH	420
	421	smu = of_find_node_by_type(NULL, "smu");
	422	if (smu == NULL)
	423	return -ENODEV;
	424
	425	/* Look for sensors subdir */
	426	for (sensors = NULL;
	427	(sensors = of_get_next_child(smu, sensors)) != NULL;)
	428	if (!strcmp(sensors->name, "sensors"))
	429	break;
	430
	431	of_node_put(smu);
	432
	433	/* Create basic sensors */
	434	for (s = NULL;
	435	sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
	436	struct smu_ad_sensor *ads;
	437
	438	ads = smu_ads_create(s);
	439	if (ads == NULL)
	440	continue;
	441	list_add(&ads->link, &smu_ads);
	442	/* keep track of cpu voltage & current */
	443	if (!strcmp(ads->sens.name, "cpu-voltage"))
	444	volt_sensor = ads;
	445	else if (!strcmp(ads->sens.name, "cpu-current"))
	446	curr_sensor = ads;
	447	}
	448
	449	of_node_put(sensors);
	450
	451	/* Create CPU power sensor if possible */
	452	if (volt_sensor && curr_sensor)
	453	smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
	454	&curr_sensor->sens);
	455
	456	return 0;
	457	}
	458
	459	static void __exit smu_sensors_exit(void)
	460	{
	461	struct smu_ad_sensor *ads;
	462
	463	/* dispose of power sensor */
	464	if (smu_cpu_power)
	465	wf_unregister_sensor(&smu_cpu_power->sens);
	466
	467	/* dispose of basic sensors */
	468	while (!list_empty(&smu_ads)) {
	469	ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
	470	list_del(&ads->link);
	471	wf_unregister_sensor(&ads->sens);
	472	}
	473	}
	474
	475
	476	module_init(smu_sensors_init);
	477	module_exit(smu_sensors_exit);
	478
	479	MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
	480	MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
	481	MODULE_LICENSE("GPL");
	482