[deliverable/linux.git] / drivers / hwmon / atxp1.c

/*
 * atxp1.c - kernel module for setting CPU VID and general purpose
 *	     I/Os using the Attansic ATXP1 chip.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/slab.h>

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
MODULE_VERSION("0.6.3");
MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");

#define ATXP1_VID	0x00
#define ATXP1_CVID	0x01
#define ATXP1_GPIO1	0x06
#define ATXP1_GPIO2	0x0a
#define ATXP1_VIDENA	0x20
#define ATXP1_VIDMASK	0x1f
#define ATXP1_GPIO1MASK	0x0f

static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };

static int atxp1_probe(struct i2c_client *client,
		       const struct i2c_device_id *id);
static int atxp1_remove(struct i2c_client *client);
static struct atxp1_data *atxp1_update_device(struct device *dev);
static int atxp1_detect(struct i2c_client *client, struct i2c_board_info *info);

static const struct i2c_device_id atxp1_id[] = {
	{ "atxp1", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, atxp1_id);

static struct i2c_driver atxp1_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "atxp1",
	},
	.probe		= atxp1_probe,
	.remove		= atxp1_remove,
	.id_table	= atxp1_id,
	.detect		= atxp1_detect,
	.address_list	= normal_i2c,
};

struct atxp1_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	unsigned long last_updated;
	u8 valid;
	struct {
		u8 vid;		/* VID output register */
		u8 cpu_vid; /* VID input from CPU */
		u8 gpio1;   /* General purpose I/O register 1 */
		u8 gpio2;   /* General purpose I/O register 2 */
	} reg;
	u8 vrm;			/* Detected CPU VRM */
};

static struct atxp1_data *atxp1_update_device(struct device *dev)
{
	struct i2c_client *client;
	struct atxp1_data *data;

	client = to_i2c_client(dev);
	data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {

		/* Update local register data */
		data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
		data->reg.cpu_vid = i2c_smbus_read_byte_data(client,
							     ATXP1_CVID);
		data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
		data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);

		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/* sys file functions for cpu0_vid */
static ssize_t atxp1_showvcore(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	int size;
	struct atxp1_data *data;

	data = atxp1_update_device(dev);

	size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK,
						 data->vrm));

	return size;
}

static ssize_t atxp1_storevcore(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct atxp1_data *data;
	struct i2c_client *client;
	int vid, cvid;
	unsigned long vcore;
	int err;

	client = to_i2c_client(dev);
	data = atxp1_update_device(dev);

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

	vcore /= 25;
	vcore *= 25;

	/* Calculate VID */
	vid = vid_to_reg(vcore, data->vrm);
	if (vid < 0) {
		dev_err(dev, "VID calculation failed.\n");
		return vid;
	}

	/*
	 * If output enabled, use control register value.
	 * Otherwise original CPU VID
	 */
	if (data->reg.vid & ATXP1_VIDENA)
		cvid = data->reg.vid & ATXP1_VIDMASK;
	else
		cvid = data->reg.cpu_vid;

	/* Nothing changed, aborting */
	if (vid == cvid)
		return count;

	dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid);

	/* Write every 25 mV step to increase stability */
	if (cvid > vid) {
		for (; cvid >= vid; cvid--)
			i2c_smbus_write_byte_data(client,
						ATXP1_VID, cvid | ATXP1_VIDENA);
	} else {
		for (; cvid <= vid; cvid++)
			i2c_smbus_write_byte_data(client,
						ATXP1_VID, cvid | ATXP1_VIDENA);
	}

	data->valid = 0;

	return count;
}

/*
 * CPU core reference voltage
 * unit: millivolt
 */
static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore,
		   atxp1_storevcore);

/* sys file functions for GPIO1 */
static ssize_t atxp1_showgpio1(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	int size;
	struct atxp1_data *data;

	data = atxp1_update_device(dev);

	size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);

	return size;
}

static ssize_t atxp1_storegpio1(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct atxp1_data *data;
	struct i2c_client *client;
	unsigned long value;
	int err;

	client = to_i2c_client(dev);
	data = atxp1_update_device(dev);

	err = kstrtoul(buf, 16, &value);
	if (err)
		return err;

	value &= ATXP1_GPIO1MASK;

	if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
		dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);

		i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);

		data->valid = 0;
	}

	return count;
}

/*
 * GPIO1 data register
 * unit: Four bit as hex (e.g. 0x0f)
 */
static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);

/* sys file functions for GPIO2 */
static ssize_t atxp1_showgpio2(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	int size;
	struct atxp1_data *data;

	data = atxp1_update_device(dev);

	size = sprintf(buf, "0x%02x\n", data->reg.gpio2);

	return size;
}

static ssize_t atxp1_storegpio2(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct atxp1_data *data = atxp1_update_device(dev);
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long value;
	int err;

	err = kstrtoul(buf, 16, &value);
	if (err)
		return err;
	value &= 0xff;

	if (value != data->reg.gpio2) {
		dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);

		i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);

		data->valid = 0;
	}

	return count;
}

/*
 * GPIO2 data register
 * unit: Eight bit as hex (e.g. 0xff)
 */
static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);

static struct attribute *atxp1_attributes[] = {
	&dev_attr_gpio1.attr,
	&dev_attr_gpio2.attr,
	&dev_attr_cpu0_vid.attr,
	NULL
};

static const struct attribute_group atxp1_group = {
	.attrs = atxp1_attributes,
};


/* Return 0 if detection is successful, -ENODEV otherwise */
static int atxp1_detect(struct i2c_client *new_client,
			struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;

	u8 temp;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	/* Detect ATXP1, checking if vendor ID registers are all zero */
	if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
	     (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
	     (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
	     (i2c_smbus_read_byte_data(new_client, 0xff) == 0)))
		return -ENODEV;

	/*
	 * No vendor ID, now checking if registers 0x10,0x11 (non-existent)
	 * showing the same as register 0x00
	 */
	temp = i2c_smbus_read_byte_data(new_client, 0x00);

	if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
	      (i2c_smbus_read_byte_data(new_client, 0x11) == temp)))
		return -ENODEV;

	/* Get VRM */
	temp = vid_which_vrm();

	if ((temp != 90) && (temp != 91)) {
		dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n",
				temp / 10, temp % 10);
		return -ENODEV;
	}

	strlcpy(info->type, "atxp1", I2C_NAME_SIZE);

	return 0;
}

static int atxp1_probe(struct i2c_client *new_client,
		       const struct i2c_device_id *id)
{
	struct atxp1_data *data;
	int err;

	data = devm_kzalloc(&new_client->dev, sizeof(struct atxp1_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* Get VRM */
	data->vrm = vid_which_vrm();

	i2c_set_clientdata(new_client, data);
	data->valid = 0;

	mutex_init(&data->update_lock);

	/* Register sysfs hooks */
	err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove_files;
	}

	dev_info(&new_client->dev, "Using VRM: %d.%d\n",
			 data->vrm / 10, data->vrm % 10);

	return 0;

exit_remove_files:
	sysfs_remove_group(&new_client->dev.kobj, &atxp1_group);
	return err;
};

static int atxp1_remove(struct i2c_client *client)
{
	struct atxp1_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &atxp1_group);

	return 0;
};

module_i2c_driver(atxp1_driver);
Commit	Line	Data
9cb7d184	1	/*
f24d548b GR	2	* atxp1.c - kernel module for setting CPU VID and general purpose
	3	* I/Os using the Attansic ATXP1 chip.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*
	19	*/
9cb7d184 SW	20
	21	#include <linux/kernel.h>
	22	#include <linux/init.h>
	23	#include <linux/module.h>
0cacdf29	24	#include <linux/jiffies.h>
9cb7d184	25	#include <linux/i2c.h>
943b0830	26	#include <linux/hwmon.h>
303760b4	27	#include <linux/hwmon-vid.h>
943b0830	28	#include <linux/err.h>
9a61bf63	29	#include <linux/mutex.h>
a5ebe668	30	#include <linux/sysfs.h>
5a0e3ad6	31	#include <linux/slab.h>
9cb7d184 SW	32
	33	MODULE_LICENSE("GPL");
	34	MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
13b3c3fa	35	MODULE_VERSION("0.6.3");
9cb7d184 SW	36	MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
	37
	38	#define ATXP1_VID 0x00
	39	#define ATXP1_CVID 0x01
	40	#define ATXP1_GPIO1 0x06
	41	#define ATXP1_GPIO2 0x0a
	42	#define ATXP1_VIDENA 0x20
	43	#define ATXP1_VIDMASK 0x1f
	44	#define ATXP1_GPIO1MASK 0x0f
	45
25e9c86d	46	static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
9cb7d184	47
71163c7c JD	48	static int atxp1_probe(struct i2c_client *client,
	49	const struct i2c_device_id *id);
	50	static int atxp1_remove(struct i2c_client *client);
f24d548b	51	static struct atxp1_data atxp1_update_device(struct device dev);
310ec792	52	static int atxp1_detect(struct i2c_client client, struct i2c_board_info info);
71163c7c JD	53
71163c7c JD	54	static const struct i2c_device_id atxp1_id[] = {
1f86df49	55	{ "atxp1", 0 },
71163c7c JD	56	{ }
	57	};
	58	MODULE_DEVICE_TABLE(i2c, atxp1_id);
9cb7d184 SW	59
9cb7d184 SW	60	static struct i2c_driver atxp1_driver = {
71163c7c	61	.class = I2C_CLASS_HWMON,
cdaf7934	62	.driver = {
cdaf7934 LR	63	.name = "atxp1",
cdaf7934 LR	64	},
71163c7c JD	65	.probe = atxp1_probe,
	66	.remove = atxp1_remove,
	67	.id_table = atxp1_id,
	68	.detect = atxp1_detect,
c3813d6a	69	.address_list = normal_i2c,
9cb7d184 SW	70	};
	71
	72	struct atxp1_data {
1beeffe4	73	struct device *hwmon_dev;
9a61bf63	74	struct mutex update_lock;
9cb7d184 SW	75	unsigned long last_updated;
	76	u8 valid;
	77	struct {
	78	u8 vid; /* VID output register */
	79	u8 cpu_vid; /* VID input from CPU */
	80	u8 gpio1; /* General purpose I/O register 1 */
	81	u8 gpio2; /* General purpose I/O register 2 */
	82	} reg;
	83	u8 vrm; /* Detected CPU VRM */
	84	};
	85
f24d548b	86	static struct atxp1_data atxp1_update_device(struct device dev)
9cb7d184 SW	87	{
	88	struct i2c_client *client;
	89	struct atxp1_data *data;
	90
	91	client = to_i2c_client(dev);
	92	data = i2c_get_clientdata(client);
	93
9a61bf63	94	mutex_lock(&data->update_lock);
9cb7d184	95
0cacdf29	96	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
9cb7d184 SW	97
	98	/* Update local register data */
	99	data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
f24d548b GR	100	data->reg.cpu_vid = i2c_smbus_read_byte_data(client,
f24d548b GR	101	ATXP1_CVID);
9cb7d184 SW	102	data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
	103	data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
	104
	105	data->valid = 1;
	106	}
	107
9a61bf63	108	mutex_unlock(&data->update_lock);
9cb7d184	109
7fe83ad8	110	return data;
9cb7d184 SW	111	}
	112
	113	/* sys file functions for cpu0_vid */
f24d548b GR	114	static ssize_t atxp1_showvcore(struct device *dev,
f24d548b GR	115	struct device_attribute attr, char buf)
9cb7d184 SW	116	{
	117	int size;
	118	struct atxp1_data *data;
	119
	120	data = atxp1_update_device(dev);
	121
f24d548b GR	122	size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK,
f24d548b GR	123	data->vrm));
9cb7d184 SW	124
	125	return size;
	126	}
	127
f24d548b GR	128	static ssize_t atxp1_storevcore(struct device *dev,
	129	struct device_attribute *attr,
	130	const char *buf, size_t count)
9cb7d184 SW	131	{
	132	struct atxp1_data *data;
	133	struct i2c_client *client;
c41bdb52	134	int vid, cvid;
f24d548b GR	135	unsigned long vcore;
f24d548b GR	136	int err;
9cb7d184 SW	137
	138	client = to_i2c_client(dev);
	139	data = atxp1_update_device(dev);
	140
f24d548b GR	141	err = kstrtoul(buf, 10, &vcore);
	142	if (err)
	143	return err;
	144
9cb7d184 SW	145	vcore /= 25;
	146	vcore *= 25;
	147
	148	/* Calculate VID */
	149	vid = vid_to_reg(vcore, data->vrm);
9cb7d184 SW	150	if (vid < 0) {
9cb7d184 SW	151	dev_err(dev, "VID calculation failed.\n");
674d0ed8	152	return vid;
9cb7d184 SW	153	}
9cb7d184 SW	154
f24d548b GR	155	/*
	156	* If output enabled, use control register value.
	157	* Otherwise original CPU VID
	158	*/
9cb7d184 SW	159	if (data->reg.vid & ATXP1_VIDENA)
	160	cvid = data->reg.vid & ATXP1_VIDMASK;
	161	else
	162	cvid = data->reg.cpu_vid;
	163
	164	/* Nothing changed, aborting */
	165	if (vid == cvid)
	166	return count;
	167
f24d548b	168	dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid);
9cb7d184 SW	169
	170	/* Write every 25 mV step to increase stability */
	171	if (cvid > vid) {
f24d548b GR	172	for (; cvid >= vid; cvid--)
	173	i2c_smbus_write_byte_data(client,
	174	ATXP1_VID, cvid \| ATXP1_VIDENA);
	175	} else {
	176	for (; cvid <= vid; cvid++)
	177	i2c_smbus_write_byte_data(client,
	178	ATXP1_VID, cvid \| ATXP1_VIDENA);
9cb7d184 SW	179	}
	180
	181	data->valid = 0;
	182
	183	return count;
	184	}
	185
f24d548b GR	186	/*
	187	* CPU core reference voltage
	188	* unit: millivolt
	189	*/
	190	static DEVICE_ATTR(cpu0_vid, S_IRUGO \| S_IWUSR, atxp1_showvcore,
	191	atxp1_storevcore);
9cb7d184 SW	192
9cb7d184 SW	193	/* sys file functions for GPIO1 */
f24d548b GR	194	static ssize_t atxp1_showgpio1(struct device *dev,
f24d548b GR	195	struct device_attribute attr, char buf)
9cb7d184 SW	196	{
	197	int size;
	198	struct atxp1_data *data;
	199
	200	data = atxp1_update_device(dev);
	201
	202	size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
	203
	204	return size;
	205	}
	206
f24d548b GR	207	static ssize_t atxp1_storegpio1(struct device *dev,
	208	struct device_attribute attr, const char buf,
	209	size_t count)
9cb7d184 SW	210	{
	211	struct atxp1_data *data;
	212	struct i2c_client *client;
f24d548b GR	213	unsigned long value;
f24d548b GR	214	int err;
9cb7d184 SW	215
	216	client = to_i2c_client(dev);
	217	data = atxp1_update_device(dev);
	218
f24d548b GR	219	err = kstrtoul(buf, 16, &value);
	220	if (err)
	221	return err;
9cb7d184 SW	222
	223	value &= ATXP1_GPIO1MASK;
	224
	225	if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
f24d548b	226	dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);
9cb7d184 SW	227
	228	i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
	229
	230	data->valid = 0;
	231	}
	232
	233	return count;
	234	}
	235
f24d548b GR	236	/*
	237	* GPIO1 data register
	238	* unit: Four bit as hex (e.g. 0x0f)
	239	*/
9cb7d184 SW	240	static DEVICE_ATTR(gpio1, S_IRUGO \| S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
	241
	242	/* sys file functions for GPIO2 */
f24d548b GR	243	static ssize_t atxp1_showgpio2(struct device *dev,
f24d548b GR	244	struct device_attribute attr, char buf)
9cb7d184 SW	245	{
	246	int size;
	247	struct atxp1_data *data;
	248
	249	data = atxp1_update_device(dev);
	250
	251	size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
	252
	253	return size;
	254	}
	255
f24d548b GR	256	static ssize_t atxp1_storegpio2(struct device *dev,
	257	struct device_attribute *attr,
	258	const char *buf, size_t count)
9cb7d184	259	{
f24d548b GR	260	struct atxp1_data *data = atxp1_update_device(dev);
	261	struct i2c_client *client = to_i2c_client(dev);
	262	unsigned long value;
	263	int err;
9cb7d184	264
f24d548b GR	265	err = kstrtoul(buf, 16, &value);
	266	if (err)
	267	return err;
	268	value &= 0xff;
9cb7d184 SW	269
9cb7d184 SW	270	if (value != data->reg.gpio2) {
f24d548b	271	dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);
9cb7d184 SW	272
	273	i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
	274
	275	data->valid = 0;
	276	}
	277
	278	return count;
	279	}
	280
f24d548b GR	281	/*
	282	* GPIO2 data register
	283	* unit: Eight bit as hex (e.g. 0xff)
	284	*/
9cb7d184 SW	285	static DEVICE_ATTR(gpio2, S_IRUGO \| S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
9cb7d184 SW	286
a5ebe668 JD	287	static struct attribute *atxp1_attributes[] = {
	288	&dev_attr_gpio1.attr,
	289	&dev_attr_gpio2.attr,
	290	&dev_attr_cpu0_vid.attr,
	291	NULL
	292	};
	293
	294	static const struct attribute_group atxp1_group = {
	295	.attrs = atxp1_attributes,
	296	};
	297
9cb7d184	298
71163c7c	299	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	300	static int atxp1_detect(struct i2c_client *new_client,
71163c7c	301	struct i2c_board_info *info)
9cb7d184	302	{
71163c7c	303	struct i2c_adapter *adapter = new_client->adapter;
9cb7d184	304
9cb7d184 SW	305	u8 temp;
	306
	307	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
71163c7c	308	return -ENODEV;
9cb7d184 SW	309
	310	/* Detect ATXP1, checking if vendor ID registers are all zero */
	311	if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
	312	(i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
	313	(i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
13b3c3fa JD	314	(i2c_smbus_read_byte_data(new_client, 0xff) == 0)))
13b3c3fa JD	315	return -ENODEV;
9cb7d184	316
f24d548b GR	317	/*
	318	* No vendor ID, now checking if registers 0x10,0x11 (non-existent)
	319	* showing the same as register 0x00
	320	*/
13b3c3fa	321	temp = i2c_smbus_read_byte_data(new_client, 0x00);
9cb7d184	322
13b3c3fa JD	323	if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
	324	(i2c_smbus_read_byte_data(new_client, 0x11) == temp)))
	325	return -ENODEV;
9cb7d184 SW	326
9cb7d184 SW	327	/* Get VRM */
71163c7c	328	temp = vid_which_vrm();
9cb7d184	329
71163c7c JD	330	if ((temp != 90) && (temp != 91)) {
	331	dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n",
	332	temp / 10, temp % 10);
	333	return -ENODEV;
9cb7d184 SW	334	}
9cb7d184 SW	335
71163c7c	336	strlcpy(info->type, "atxp1", I2C_NAME_SIZE);
9cb7d184	337
71163c7c JD	338	return 0;
71163c7c JD	339	}
9cb7d184	340
71163c7c JD	341	static int atxp1_probe(struct i2c_client *new_client,
	342	const struct i2c_device_id *id)
	343	{
	344	struct atxp1_data *data;
	345	int err;
9cb7d184	346
d466a353 GR	347	data = devm_kzalloc(&new_client->dev, sizeof(struct atxp1_data),
	348	GFP_KERNEL);
	349	if (!data)
	350	return -ENOMEM;
9cb7d184	351
71163c7c JD	352	/* Get VRM */
	353	data->vrm = vid_which_vrm();
	354
	355	i2c_set_clientdata(new_client, data);
	356	data->valid = 0;
	357
	358	mutex_init(&data->update_lock);
	359
a5ebe668	360	/* Register sysfs hooks */
f24d548b GR	361	err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group);
f24d548b GR	362	if (err)
d466a353	363	return err;
a5ebe668	364
1beeffe4 TJ	365	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	366	if (IS_ERR(data->hwmon_dev)) {
	367	err = PTR_ERR(data->hwmon_dev);
a5ebe668	368	goto exit_remove_files;
943b0830 MH	369	}
943b0830 MH	370
9cb7d184 SW	371	dev_info(&new_client->dev, "Using VRM: %d.%d\n",
	372	data->vrm / 10, data->vrm % 10);
	373
	374	return 0;
	375
a5ebe668 JD	376	exit_remove_files:
a5ebe668 JD	377	sysfs_remove_group(&new_client->dev.kobj, &atxp1_group);
9cb7d184 SW	378	return err;
	379	};
	380
71163c7c	381	static int atxp1_remove(struct i2c_client *client)
9cb7d184	382	{
f24d548b	383	struct atxp1_data *data = i2c_get_clientdata(client);
9cb7d184	384
1beeffe4	385	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	386	sysfs_remove_group(&client->dev.kobj, &atxp1_group);
943b0830	387
71163c7c	388	return 0;
9cb7d184 SW	389	};
9cb7d184 SW	390
f0967eea	391	module_i2c_driver(atxp1_driver);