[deliverable/linux.git] / drivers / hwmon / ultra45_env.c

/*
 * ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
 *
 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/io.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>

#define DRV_MODULE_VERSION	"0.1"

MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

/* PIC device registers */
#define REG_CMD		0x00UL
#define  REG_CMD_RESET	0x80
#define  REG_CMD_ESTAR	0x01
#define REG_STAT	0x01UL
#define  REG_STAT_FWVER	0xf0
#define  REG_STAT_TGOOD	0x08
#define  REG_STAT_STALE	0x04
#define  REG_STAT_BUSY	0x02
#define  REG_STAT_FAULT	0x01
#define REG_DATA	0x40UL
#define REG_ADDR	0x41UL
#define REG_SIZE	0x42UL

/* Registers accessed indirectly via REG_DATA/REG_ADDR */
#define IREG_FAN0		0x00
#define IREG_FAN1		0x01
#define IREG_FAN2		0x02
#define IREG_FAN3		0x03
#define IREG_FAN4		0x04
#define IREG_FAN5		0x05
#define IREG_LCL_TEMP		0x06
#define IREG_RMT1_TEMP		0x07
#define IREG_RMT2_TEMP		0x08
#define IREG_RMT3_TEMP		0x09
#define IREG_LM95221_TEMP	0x0a
#define IREG_FIRE_TEMP		0x0b
#define IREG_LSI1064_TEMP	0x0c
#define IREG_FRONT_TEMP		0x0d
#define IREG_FAN_STAT		0x0e
#define IREG_VCORE0		0x0f
#define IREG_VCORE1		0x10
#define IREG_VMEM0		0x11
#define IREG_VMEM1		0x12
#define IREG_PSU_TEMP		0x13

struct env {
	void __iomem	*regs;
	spinlock_t	lock;

	struct device	*hwmon_dev;
};

static u8 env_read(struct env *p, u8 ireg)
{
	u8 ret;

	spin_lock(&p->lock);
	writeb(ireg, p->regs + REG_ADDR);
	ret = readb(p->regs + REG_DATA);
	spin_unlock(&p->lock);

	return ret;
}

static void env_write(struct env *p, u8 ireg, u8 val)
{
	spin_lock(&p->lock);
	writeb(ireg, p->regs + REG_ADDR);
	writeb(val, p->regs + REG_DATA);
	spin_unlock(&p->lock);
}

/*
 * There seems to be a adr7462 providing these values, thus a lot
 * of these calculations are borrowed from the adt7470 driver.
 */
#define FAN_PERIOD_TO_RPM(x)	((90000 * 60) / (x))
#define FAN_RPM_TO_PERIOD	FAN_PERIOD_TO_RPM
#define FAN_PERIOD_INVALID	(0xff << 8)
#define FAN_DATA_VALID(x)	((x) && (x) != FAN_PERIOD_INVALID)

static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr,
			      char *buf)
{
	int fan_nr = to_sensor_dev_attr(attr)->index;
	struct env *p = dev_get_drvdata(dev);
	int rpm, period;
	u8 val;

	val = env_read(p, IREG_FAN0 + fan_nr);
	period = (int) val << 8;
	if (FAN_DATA_VALID(period))
		rpm = FAN_PERIOD_TO_RPM(period);
	else
		rpm = 0;

	return sprintf(buf, "%d\n", rpm);
}

static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	int fan_nr = to_sensor_dev_attr(attr)->index;
	unsigned long rpm;
	struct env *p = dev_get_drvdata(dev);
	int period;
	u8 val;
	int err;

	err = kstrtoul(buf, 10, &rpm);
	if (err)
		return err;

	if (!rpm)
		return -EINVAL;

	period = FAN_RPM_TO_PERIOD(rpm);
	val = period >> 8;
	env_write(p, IREG_FAN0 + fan_nr, val);

	return count;
}

static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr,
			      char *buf)
{
	int fan_nr = to_sensor_dev_attr(attr)->index;
	struct env *p = dev_get_drvdata(dev);
	u8 val = env_read(p, IREG_FAN_STAT);
	return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
}

#define fan(index)							\
static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR,	\
		show_fan_speed, set_fan_speed, index);			\
static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO,			\
		show_fan_fault, NULL, index)

fan(0);
fan(1);
fan(2);
fan(3);
fan(4);

static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);

static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	int temp_nr = to_sensor_dev_attr(attr)->index;
	struct env *p = dev_get_drvdata(dev);
	s8 val;

	val = env_read(p, IREG_LCL_TEMP + temp_nr);
	return sprintf(buf, "%d\n", ((int) val) - 64);
}

static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);

static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct env *p = dev_get_drvdata(dev);
	u8 val;

	val = readb(p->regs + REG_STAT);
	return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
}

static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,
			  3);

static ssize_t show_fwver(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct env *p = dev_get_drvdata(dev);
	u8 val;

	val = readb(p->regs + REG_STAT);
	return sprintf(buf, "%d\n", val >> 4);
}

static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);

static ssize_t show_name(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	return sprintf(buf, "ultra45\n");
}

static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);

static struct attribute *env_attributes[] = {
	&sensor_dev_attr_fan0_speed.dev_attr.attr,
	&sensor_dev_attr_fan0_fault.dev_attr.attr,
	&sensor_dev_attr_fan1_speed.dev_attr.attr,
	&sensor_dev_attr_fan1_fault.dev_attr.attr,
	&sensor_dev_attr_fan2_speed.dev_attr.attr,
	&sensor_dev_attr_fan2_fault.dev_attr.attr,
	&sensor_dev_attr_fan3_speed.dev_attr.attr,
	&sensor_dev_attr_fan3_fault.dev_attr.attr,
	&sensor_dev_attr_fan4_speed.dev_attr.attr,
	&sensor_dev_attr_fan4_fault.dev_attr.attr,
	&sensor_dev_attr_psu_fan_fault.dev_attr.attr,
	&sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
	&sensor_dev_attr_cpu0_temp.dev_attr.attr,
	&sensor_dev_attr_cpu1_temp.dev_attr.attr,
	&sensor_dev_attr_motherboard_temp.dev_attr.attr,
	&sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
	&sensor_dev_attr_fire_temp.dev_attr.attr,
	&sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
	&sensor_dev_attr_front_panel_temp.dev_attr.attr,
	&sensor_dev_attr_psu_temp.dev_attr.attr,
	&sensor_dev_attr_fan_failure.dev_attr.attr,
	&sensor_dev_attr_env_bus_busy.dev_attr.attr,
	&sensor_dev_attr_env_data_stale.dev_attr.attr,
	&sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
	&sensor_dev_attr_firmware_version.dev_attr.attr,
	&sensor_dev_attr_name.dev_attr.attr,
	NULL,
};

static const struct attribute_group env_group = {
	.attrs = env_attributes,
};

static int env_probe(struct platform_device *op)
{
	struct env *p = kzalloc(sizeof(*p), GFP_KERNEL);
	int err = -ENOMEM;

	if (!p)
		goto out;

	spin_lock_init(&p->lock);

	p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
	if (!p->regs)
		goto out_free;

	err = sysfs_create_group(&op->dev.kobj, &env_group);
	if (err)
		goto out_iounmap;

	p->hwmon_dev = hwmon_device_register(&op->dev);
	if (IS_ERR(p->hwmon_dev)) {
		err = PTR_ERR(p->hwmon_dev);
		goto out_sysfs_remove_group;
	}

	platform_set_drvdata(op, p);
	err = 0;

out:
	return err;

out_sysfs_remove_group:
	sysfs_remove_group(&op->dev.kobj, &env_group);

out_iounmap:
	of_iounmap(&op->resource[0], p->regs, REG_SIZE);

out_free:
	kfree(p);
	goto out;
}

static int env_remove(struct platform_device *op)
{
	struct env *p = platform_get_drvdata(op);

	if (p) {
		sysfs_remove_group(&op->dev.kobj, &env_group);
		hwmon_device_unregister(p->hwmon_dev);
		of_iounmap(&op->resource[0], p->regs, REG_SIZE);
		kfree(p);
	}

	return 0;
}

static const struct of_device_id env_match[] = {
	{
		.name = "env-monitor",
		.compatible = "SUNW,ebus-pic16f747-env",
	},
	{},
};
MODULE_DEVICE_TABLE(of, env_match);

static struct platform_driver env_driver = {
	.driver = {
		.name = "ultra45_env",
		.owner = THIS_MODULE,
		.of_match_table = env_match,
	},
	.probe		= env_probe,
	.remove		= env_remove,
};

module_platform_driver(env_driver);
Commit	Line	Data
a80b10cc GR	1	/*
a80b10cc GR	2	* ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
e0418088 DM	3	*
	4	* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
	5	*/
	6
	7	#include <linux/kernel.h>
	8	#include <linux/types.h>
	9	#include <linux/slab.h>
31a1a152	10	#include <linux/module.h>
e0418088 DM	11	#include <linux/of_device.h>
	12	#include <linux/io.h>
	13	#include <linux/hwmon.h>
	14	#include <linux/hwmon-sysfs.h>
fa845740	15	#include <linux/err.h>
e0418088 DM	16
	17	#define DRV_MODULE_VERSION "0.1"
	18
	19	MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
	20	MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
	21	MODULE_LICENSE("GPL");
	22	MODULE_VERSION(DRV_MODULE_VERSION);
	23
	24	/* PIC device registers */
	25	#define REG_CMD 0x00UL
	26	#define REG_CMD_RESET 0x80
	27	#define REG_CMD_ESTAR 0x01
	28	#define REG_STAT 0x01UL
	29	#define REG_STAT_FWVER 0xf0
	30	#define REG_STAT_TGOOD 0x08
	31	#define REG_STAT_STALE 0x04
	32	#define REG_STAT_BUSY 0x02
	33	#define REG_STAT_FAULT 0x01
	34	#define REG_DATA 0x40UL
	35	#define REG_ADDR 0x41UL
	36	#define REG_SIZE 0x42UL
	37
	38	/* Registers accessed indirectly via REG_DATA/REG_ADDR */
	39	#define IREG_FAN0 0x00
	40	#define IREG_FAN1 0x01
	41	#define IREG_FAN2 0x02
	42	#define IREG_FAN3 0x03
	43	#define IREG_FAN4 0x04
	44	#define IREG_FAN5 0x05
	45	#define IREG_LCL_TEMP 0x06
	46	#define IREG_RMT1_TEMP 0x07
	47	#define IREG_RMT2_TEMP 0x08
	48	#define IREG_RMT3_TEMP 0x09
	49	#define IREG_LM95221_TEMP 0x0a
	50	#define IREG_FIRE_TEMP 0x0b
	51	#define IREG_LSI1064_TEMP 0x0c
	52	#define IREG_FRONT_TEMP 0x0d
	53	#define IREG_FAN_STAT 0x0e
	54	#define IREG_VCORE0 0x0f
	55	#define IREG_VCORE1 0x10
	56	#define IREG_VMEM0 0x11
	57	#define IREG_VMEM1 0x12
	58	#define IREG_PSU_TEMP 0x13
	59
	60	struct env {
	61	void __iomem *regs;
	62	spinlock_t lock;
	63
	64	struct device *hwmon_dev;
	65	};
	66
	67	static u8 env_read(struct env *p, u8 ireg)
	68	{
	69	u8 ret;
	70
	71	spin_lock(&p->lock);
	72	writeb(ireg, p->regs + REG_ADDR);
	73	ret = readb(p->regs + REG_DATA);
	74	spin_unlock(&p->lock);
	75
	76	return ret;
	77	}
	78
	79	static void env_write(struct env *p, u8 ireg, u8 val)
80	{
81	spin_lock(&p->lock);
82	writeb(ireg, p->regs + REG_ADDR);
83	writeb(val, p->regs + REG_DATA);
84	spin_unlock(&p->lock);
85	}
86
a80b10cc GR	87	/*
a80b10cc GR	88	* There seems to be a adr7462 providing these values, thus a lot
e0418088 DM	89	* of these calculations are borrowed from the adt7470 driver.
	90	*/
	91	#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
	92	#define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM
	93	#define FAN_PERIOD_INVALID (0xff << 8)
	94	#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
	95
a80b10cc GR	96	static ssize_t show_fan_speed(struct device dev, struct device_attribute attr,
a80b10cc GR	97	char *buf)
e0418088 DM	98	{
	99	int fan_nr = to_sensor_dev_attr(attr)->index;
	100	struct env *p = dev_get_drvdata(dev);
	101	int rpm, period;
	102	u8 val;
	103
	104	val = env_read(p, IREG_FAN0 + fan_nr);
	105	period = (int) val << 8;
	106	if (FAN_DATA_VALID(period))
	107	rpm = FAN_PERIOD_TO_RPM(period);
	108	else
	109	rpm = 0;
	110
	111	return sprintf(buf, "%d\n", rpm);
	112	}
	113
	114	static ssize_t set_fan_speed(struct device dev, struct device_attribute attr,
	115	const char *buf, size_t count)
	116	{
	117	int fan_nr = to_sensor_dev_attr(attr)->index;
a80b10cc	118	unsigned long rpm;
e0418088 DM	119	struct env *p = dev_get_drvdata(dev);
	120	int period;
	121	u8 val;
a80b10cc GR	122	int err;
	123
	124	err = kstrtoul(buf, 10, &rpm);
	125	if (err)
	126	return err;
e0418088 DM	127
	128	if (!rpm)
	129	return -EINVAL;
	130
	131	period = FAN_RPM_TO_PERIOD(rpm);
	132	val = period >> 8;
	133	env_write(p, IREG_FAN0 + fan_nr, val);
	134
	135	return count;
	136	}
	137
a80b10cc GR	138	static ssize_t show_fan_fault(struct device dev, struct device_attribute attr,
a80b10cc GR	139	char *buf)
e0418088 DM	140	{
	141	int fan_nr = to_sensor_dev_attr(attr)->index;
	142	struct env *p = dev_get_drvdata(dev);
	143	u8 val = env_read(p, IREG_FAN_STAT);
	144	return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
	145	}
	146
	147	#define fan(index) \
	148	static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO \| S_IWUSR, \
	149	show_fan_speed, set_fan_speed, index); \
	150	static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \
	151	show_fan_fault, NULL, index)
	152
	153	fan(0);
	154	fan(1);
	155	fan(2);
	156	fan(3);
	157	fan(4);
	158
	159	static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
	160
a80b10cc GR	161	static ssize_t show_temp(struct device dev, struct device_attribute attr,
a80b10cc GR	162	char *buf)
e0418088 DM	163	{
	164	int temp_nr = to_sensor_dev_attr(attr)->index;
	165	struct env *p = dev_get_drvdata(dev);
	166	s8 val;
	167
	168	val = env_read(p, IREG_LCL_TEMP + temp_nr);
	169	return sprintf(buf, "%d\n", ((int) val) - 64);
	170	}
	171
	172	static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
	173	static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
	174	static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
	175	static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
	176	static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
	177	static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
	178	static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
	179	static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
	180	static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
	181
a80b10cc GR	182	static ssize_t show_stat_bit(struct device dev, struct device_attribute attr,
a80b10cc GR	183	char *buf)
e0418088 DM	184	{
	185	int index = to_sensor_dev_attr(attr)->index;
	186	struct env *p = dev_get_drvdata(dev);
	187	u8 val;
	188
	189	val = readb(p->regs + REG_STAT);
	190	return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
	191	}
	192
	193	static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
	194	static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
	195	static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
a80b10cc GR	196	static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,
a80b10cc GR	197	3);
e0418088	198
a80b10cc GR	199	static ssize_t show_fwver(struct device dev, struct device_attribute attr,
a80b10cc GR	200	char *buf)
e0418088 DM	201	{
	202	struct env *p = dev_get_drvdata(dev);
	203	u8 val;
	204
	205	val = readb(p->regs + REG_STAT);
	206	return sprintf(buf, "%d\n", val >> 4);
	207	}
	208
	209	static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
	210
a80b10cc GR	211	static ssize_t show_name(struct device dev, struct device_attribute attr,
a80b10cc GR	212	char *buf)
e0418088 DM	213	{
	214	return sprintf(buf, "ultra45\n");
	215	}
	216
	217	static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
	218
	219	static struct attribute *env_attributes[] = {
	220	&sensor_dev_attr_fan0_speed.dev_attr.attr,
	221	&sensor_dev_attr_fan0_fault.dev_attr.attr,
	222	&sensor_dev_attr_fan1_speed.dev_attr.attr,
	223	&sensor_dev_attr_fan1_fault.dev_attr.attr,
	224	&sensor_dev_attr_fan2_speed.dev_attr.attr,
	225	&sensor_dev_attr_fan2_fault.dev_attr.attr,
	226	&sensor_dev_attr_fan3_speed.dev_attr.attr,
	227	&sensor_dev_attr_fan3_fault.dev_attr.attr,
	228	&sensor_dev_attr_fan4_speed.dev_attr.attr,
	229	&sensor_dev_attr_fan4_fault.dev_attr.attr,
	230	&sensor_dev_attr_psu_fan_fault.dev_attr.attr,
	231	&sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
	232	&sensor_dev_attr_cpu0_temp.dev_attr.attr,
	233	&sensor_dev_attr_cpu1_temp.dev_attr.attr,
	234	&sensor_dev_attr_motherboard_temp.dev_attr.attr,
	235	&sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
	236	&sensor_dev_attr_fire_temp.dev_attr.attr,
	237	&sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
	238	&sensor_dev_attr_front_panel_temp.dev_attr.attr,
	239	&sensor_dev_attr_psu_temp.dev_attr.attr,
	240	&sensor_dev_attr_fan_failure.dev_attr.attr,
	241	&sensor_dev_attr_env_bus_busy.dev_attr.attr,
	242	&sensor_dev_attr_env_data_stale.dev_attr.attr,
	243	&sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
	244	&sensor_dev_attr_firmware_version.dev_attr.attr,
	245	&sensor_dev_attr_name.dev_attr.attr,
	246	NULL,
	247	};
	248
	249	static const struct attribute_group env_group = {
	250	.attrs = env_attributes,
	251	};
	252
6c931ae1	253	static int env_probe(struct platform_device *op)
e0418088 DM	254	{
	255	struct env p = kzalloc(sizeof(p), GFP_KERNEL);
	256	int err = -ENOMEM;
	257
	258	if (!p)
	259	goto out;
	260
	261	spin_lock_init(&p->lock);
	262
	263	p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
	264	if (!p->regs)
	265	goto out_free;
	266
	267	err = sysfs_create_group(&op->dev.kobj, &env_group);
	268	if (err)
	269	goto out_iounmap;
	270
	271	p->hwmon_dev = hwmon_device_register(&op->dev);
	272	if (IS_ERR(p->hwmon_dev)) {
	273	err = PTR_ERR(p->hwmon_dev);
	274	goto out_sysfs_remove_group;
	275	}
	276
95de3b25	277	platform_set_drvdata(op, p);
e0418088 DM	278	err = 0;
	279
	280	out:
	281	return err;
	282
	283	out_sysfs_remove_group:
	284	sysfs_remove_group(&op->dev.kobj, &env_group);
	285
	286	out_iounmap:
	287	of_iounmap(&op->resource[0], p->regs, REG_SIZE);
	288
	289	out_free:
	290	kfree(p);
	291	goto out;
	292	}
	293
281dfd0b	294	static int env_remove(struct platform_device *op)
e0418088	295	{
95de3b25	296	struct env *p = platform_get_drvdata(op);
e0418088 DM	297
	298	if (p) {
	299	sysfs_remove_group(&op->dev.kobj, &env_group);
	300	hwmon_device_unregister(p->hwmon_dev);
	301	of_iounmap(&op->resource[0], p->regs, REG_SIZE);
	302	kfree(p);
	303	}
	304
	305	return 0;
	306	}
	307
fd098316	308	static const struct of_device_id env_match[] = {
e0418088 DM	309	{
	310	.name = "env-monitor",
	311	.compatible = "SUNW,ebus-pic16f747-env",
	312	},
	313	{},
	314	};
	315	MODULE_DEVICE_TABLE(of, env_match);
	316
4ebb24f7	317	static struct platform_driver env_driver = {
4018294b GL	318	.driver = {
	319	.name = "ultra45_env",
	320	.owner = THIS_MODULE,
	321	.of_match_table = env_match,
	322	},
e0418088	323	.probe = env_probe,
9e5e9b7a	324	.remove = env_remove,
e0418088 DM	325	};
e0418088 DM	326
25a236a5	327	module_platform_driver(env_driver);