[linux.git] / drivers / hwmon / pcf8591.c

/*
    Copyright (C) 2001-2004 Aurelien Jarno <[email protected]>
    Ported to Linux 2.6 by Aurelien Jarno <[email protected]> with
    the help of Jean Delvare <[email protected]>

    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/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/hwmon.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
					0x4d, 0x4e, 0x4f, I2C_CLIENT_END };

/* Insmod parameters */

static int input_mode;
module_param(input_mode, int, 0);
MODULE_PARM_DESC(input_mode,
	"Analog input mode:\n"
	" 0 = four single ended inputs\n"
	" 1 = three differential inputs\n"
	" 2 = single ended and differential mixed\n"
	" 3 = two differential inputs\n");

/* The PCF8591 control byte
      7    6    5    4    3    2    1    0
   |  0 |AOEF|   AIP   |  0 |AINC|  AICH   | */

/* Analog Output Enable Flag (analog output active if 1) */
#define PCF8591_CONTROL_AOEF		0x40

/* Analog Input Programming
   0x00 = four single ended inputs
   0x10 = three differential inputs
   0x20 = single ended and differential mixed
   0x30 = two differential inputs */
#define PCF8591_CONTROL_AIP_MASK	0x30

/* Autoincrement Flag (switch on if 1) */
#define PCF8591_CONTROL_AINC		0x04

/* Channel selection
   0x00 = channel 0
   0x01 = channel 1
   0x02 = channel 2
   0x03 = channel 3 */
#define PCF8591_CONTROL_AICH_MASK	0x03

/* Initial values */
#define PCF8591_INIT_CONTROL	((input_mode << 4) | PCF8591_CONTROL_AOEF)
#define PCF8591_INIT_AOUT	0	/* DAC out = 0 */

/* Conversions */
#define REG_TO_SIGNED(reg)	(((reg) & 0x80)?((reg) - 256):(reg))

struct pcf8591_data {
	struct device *hwmon_dev;
	struct mutex update_lock;

	u8 control;
	u8 aout;
};

static void pcf8591_init_client(struct i2c_client *client);
static int pcf8591_read_channel(struct device *dev, int channel);

/* following are the sysfs callback functions */
#define show_in_channel(channel)					\
static ssize_t show_in##channel##_input(struct device *dev, struct device_attribute *attr, char *buf)	\
{									\
	return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
}									\
static DEVICE_ATTR(in##channel##_input, S_IRUGO,			\
		   show_in##channel##_input, NULL);

show_in_channel(0);
show_in_channel(1);
show_in_channel(2);
show_in_channel(3);

static ssize_t show_out0_ouput(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
	return sprintf(buf, "%d\n", data->aout * 10);
}

static ssize_t set_out0_output(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned int value;
	struct i2c_client *client = to_i2c_client(dev);
	struct pcf8591_data *data = i2c_get_clientdata(client);
	if ((value = (simple_strtoul(buf, NULL, 10) + 5) / 10) <= 255) {
		data->aout = value;
		i2c_smbus_write_byte_data(client, data->control, data->aout);
		return count;
	}
	return -EINVAL;
}

static DEVICE_ATTR(out0_output, S_IWUSR | S_IRUGO,
		   show_out0_ouput, set_out0_output);

static ssize_t show_out0_enable(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
	return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF)));
}

static ssize_t set_out0_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct pcf8591_data *data = i2c_get_clientdata(client);
	unsigned long val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	if (val)
		data->control |= PCF8591_CONTROL_AOEF;
	else
		data->control &= ~PCF8591_CONTROL_AOEF;
	i2c_smbus_write_byte(client, data->control);
	mutex_unlock(&data->update_lock);
	return count;
}

static DEVICE_ATTR(out0_enable, S_IWUSR | S_IRUGO,
		   show_out0_enable, set_out0_enable);

static struct attribute *pcf8591_attributes[] = {
	&dev_attr_out0_enable.attr,
	&dev_attr_out0_output.attr,
	&dev_attr_in0_input.attr,
	&dev_attr_in1_input.attr,
	NULL
};

static const struct attribute_group pcf8591_attr_group = {
	.attrs = pcf8591_attributes,
};

static struct attribute *pcf8591_attributes_opt[] = {
	&dev_attr_in2_input.attr,
	&dev_attr_in3_input.attr,
	NULL
};

static const struct attribute_group pcf8591_attr_group_opt = {
	.attrs = pcf8591_attributes_opt,
};

/*
 * Real code
 */

/* Return 0 if detection is successful, -ENODEV otherwise */
static int pcf8591_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE
				     | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
		return -ENODEV;

	/* Now, we would do the remaining detection. But the PCF8591 is plainly
	   impossible to detect! Stupid chip. */

	strlcpy(info->type, "pcf8591", I2C_NAME_SIZE);

	return 0;
}

static int pcf8591_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct pcf8591_data *data;
	int err;

	if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/* Initialize the PCF8591 chip */
	pcf8591_init_client(client);

	/* Register sysfs hooks */
	err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);
	if (err)
		goto exit_kfree;

	/* Register input2 if not in "two differential inputs" mode */
	if (input_mode != 3) {
		if ((err = device_create_file(&client->dev,
					      &dev_attr_in2_input)))
			goto exit_sysfs_remove;
	}

	/* Register input3 only in "four single ended inputs" mode */
	if (input_mode == 0) {
		if ((err = device_create_file(&client->dev,
					      &dev_attr_in3_input)))
			goto exit_sysfs_remove;
	}

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

	return 0;

exit_sysfs_remove:
	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
exit_kfree:
	kfree(data);
exit:
	return err;
}

static int pcf8591_remove(struct i2c_client *client)
{
	struct pcf8591_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
	kfree(i2c_get_clientdata(client));
	return 0;
}

/* Called when we have found a new PCF8591. */
static void pcf8591_init_client(struct i2c_client *client)
{
	struct pcf8591_data *data = i2c_get_clientdata(client);
	data->control = PCF8591_INIT_CONTROL;
	data->aout = PCF8591_INIT_AOUT;

	i2c_smbus_write_byte_data(client, data->control, data->aout);

	/* The first byte transmitted contains the conversion code of the
	   previous read cycle. FLUSH IT! */
	i2c_smbus_read_byte(client);
}

static int pcf8591_read_channel(struct device *dev, int channel)
{
	u8 value;
	struct i2c_client *client = to_i2c_client(dev);
	struct pcf8591_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) {
		data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK)
			      | channel;
		i2c_smbus_write_byte(client, data->control);

		/* The first byte transmitted contains the conversion code of
		   the previous read cycle. FLUSH IT! */
		i2c_smbus_read_byte(client);
	}
	value = i2c_smbus_read_byte(client);

	mutex_unlock(&data->update_lock);

	if ((channel == 2 && input_mode == 2) ||
	    (channel != 3 && (input_mode == 1 || input_mode == 3)))
		return (10 * REG_TO_SIGNED(value));
	else
		return (10 * value);
}

static const struct i2c_device_id pcf8591_id[] = {
	{ "pcf8591", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pcf8591_id);

static struct i2c_driver pcf8591_driver = {
	.driver = {
		.name	= "pcf8591",
	},
	.probe		= pcf8591_probe,
	.remove		= pcf8591_remove,
	.id_table	= pcf8591_id,

	.class		= I2C_CLASS_HWMON,	/* Nearest choice */
	.detect		= pcf8591_detect,
	.address_list	= normal_i2c,
};

static int __init pcf8591_init(void)
{
	if (input_mode < 0 || input_mode > 3) {
		printk(KERN_WARNING "pcf8591: invalid input_mode (%d)\n",
		       input_mode);
		input_mode = 0;
	}
	return i2c_add_driver(&pcf8591_driver);
}

static void __exit pcf8591_exit(void)
{
	i2c_del_driver(&pcf8591_driver);
}

MODULE_AUTHOR("Aurelien Jarno <[email protected]>");
MODULE_DESCRIPTION("PCF8591 driver");
MODULE_LICENSE("GPL");

module_init(pcf8591_init);
module_exit(pcf8591_exit);
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	Copyright (C) 2001-2004 Aurelien Jarno <[email protected]>
fb4504fe	3	Ported to Linux 2.6 by Aurelien Jarno <[email protected]> with
1da177e4 LT	4	the help of Jean Delvare <[email protected]>
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21	#include <linux/module.h>
	22	#include <linux/init.h>
	23	#include <linux/slab.h>
	24	#include <linux/i2c.h>
5c085d36	25	#include <linux/mutex.h>
4275fcd6 JD	26	#include <linux/err.h>
4275fcd6 JD	27	#include <linux/hwmon.h>
1da177e4 LT	28
1da177e4 LT	29	/* Addresses to scan */
2cdddeb8	30	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
1da177e4	31	0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
1da177e4 LT	32
1da177e4 LT	33	/* Insmod parameters */
1da177e4 LT	34
	35	static int input_mode;
	36	module_param(input_mode, int, 0);
	37	MODULE_PARM_DESC(input_mode,
	38	"Analog input mode:\n"
	39	" 0 = four single ended inputs\n"
	40	" 1 = three differential inputs\n"
	41	" 2 = single ended and differential mixed\n"
	42	" 3 = two differential inputs\n");
	43
	44	/* The PCF8591 control byte
fb4504fe	45	7 6 5 4 3 2 1 0
1da177e4 LT	46	\| 0 \|AOEF\| AIP \| 0 \|AINC\| AICH \| */
	47
	48	/* Analog Output Enable Flag (analog output active if 1) */
	49	#define PCF8591_CONTROL_AOEF 0x40
fb4504fe JD	50
fb4504fe JD	51	/* Analog Input Programming
1da177e4 LT	52	0x00 = four single ended inputs
	53	0x10 = three differential inputs
	54	0x20 = single ended and differential mixed
	55	0x30 = two differential inputs */
	56	#define PCF8591_CONTROL_AIP_MASK 0x30
	57
	58	/* Autoincrement Flag (switch on if 1) */
	59	#define PCF8591_CONTROL_AINC 0x04
	60
	61	/* Channel selection
fb4504fe	62	0x00 = channel 0
1da177e4 LT	63	0x01 = channel 1
	64	0x02 = channel 2
	65	0x03 = channel 3 */
	66	#define PCF8591_CONTROL_AICH_MASK 0x03
	67
	68	/* Initial values */
	69	#define PCF8591_INIT_CONTROL ((input_mode << 4) \| PCF8591_CONTROL_AOEF)
	70	#define PCF8591_INIT_AOUT 0 /* DAC out = 0 */
	71
	72	/* Conversions */
	73	#define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg))
	74
	75	struct pcf8591_data {
4275fcd6	76	struct device *hwmon_dev;
5c085d36	77	struct mutex update_lock;
1da177e4 LT	78
	79	u8 control;
	80	u8 aout;
	81	};
	82
1da177e4 LT	83	static void pcf8591_init_client(struct i2c_client *client);
	84	static int pcf8591_read_channel(struct device *dev, int channel);
	85
1da177e4 LT	86	/* following are the sysfs callback functions */
1da177e4 LT	87	#define show_in_channel(channel) \
a5099cfc	88	static ssize_t show_in##channel##_input(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	89	{ \
	90	return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
	91	} \
	92	static DEVICE_ATTR(in##channel##_input, S_IRUGO, \
	93	show_in##channel##_input, NULL);
	94
	95	show_in_channel(0);
	96	show_in_channel(1);
	97	show_in_channel(2);
	98	show_in_channel(3);
	99
a5099cfc	100	static ssize_t show_out0_ouput(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	101	{
	102	struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
	103	return sprintf(buf, "%d\n", data->aout * 10);
	104	}
	105
a5099cfc	106	static ssize_t set_out0_output(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	107	{
	108	unsigned int value;
	109	struct i2c_client *client = to_i2c_client(dev);
	110	struct pcf8591_data *data = i2c_get_clientdata(client);
	111	if ((value = (simple_strtoul(buf, NULL, 10) + 5) / 10) <= 255) {
	112	data->aout = value;
	113	i2c_smbus_write_byte_data(client, data->control, data->aout);
	114	return count;
	115	}
	116	return -EINVAL;
	117	}
	118
fb4504fe	119	static DEVICE_ATTR(out0_output, S_IWUSR \| S_IRUGO,
1da177e4 LT	120	show_out0_ouput, set_out0_output);
1da177e4 LT	121
a5099cfc	122	static ssize_t show_out0_enable(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	123	{
	124	struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
	125	return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF)));
	126	}
	127
a5099cfc	128	static ssize_t set_out0_enable(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	129	{
	130	struct i2c_client *client = to_i2c_client(dev);
	131	struct pcf8591_data *data = i2c_get_clientdata(client);
	132	unsigned long val = simple_strtoul(buf, NULL, 10);
	133
5c085d36	134	mutex_lock(&data->update_lock);
1da177e4 LT	135	if (val)
	136	data->control \|= PCF8591_CONTROL_AOEF;
	137	else
	138	data->control &= ~PCF8591_CONTROL_AOEF;
	139	i2c_smbus_write_byte(client, data->control);
5c085d36	140	mutex_unlock(&data->update_lock);
1da177e4 LT	141	return count;
	142	}
	143
fb4504fe	144	static DEVICE_ATTR(out0_enable, S_IWUSR \| S_IRUGO,
1da177e4 LT	145	show_out0_enable, set_out0_enable);
1da177e4 LT	146
7d9db67f JD	147	static struct attribute *pcf8591_attributes[] = {
	148	&dev_attr_out0_enable.attr,
	149	&dev_attr_out0_output.attr,
	150	&dev_attr_in0_input.attr,
	151	&dev_attr_in1_input.attr,
	152	NULL
	153	};
	154
	155	static const struct attribute_group pcf8591_attr_group = {
	156	.attrs = pcf8591_attributes,
	157	};
	158
	159	static struct attribute *pcf8591_attributes_opt[] = {
	160	&dev_attr_in2_input.attr,
	161	&dev_attr_in3_input.attr,
	162	NULL
	163	};
	164
	165	static const struct attribute_group pcf8591_attr_group_opt = {
	166	.attrs = pcf8591_attributes_opt,
	167	};
	168
1da177e4 LT	169	/*
	170	* Real code
	171	*/
1da177e4	172
8b77e6ac	173	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	174	static int pcf8591_detect(struct i2c_client *client,
8b77e6ac	175	struct i2c_board_info *info)
1da177e4	176	{
8b77e6ac	177	struct i2c_adapter *adapter = client->adapter;
1da177e4 LT	178
	179	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE
	180	\| I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
8b77e6ac JD	181	return -ENODEV;
	182
	183	/* Now, we would do the remaining detection. But the PCF8591 is plainly
	184	impossible to detect! Stupid chip. */
	185
	186	strlcpy(info->type, "pcf8591", I2C_NAME_SIZE);
	187
	188	return 0;
	189	}
	190
	191	static int pcf8591_probe(struct i2c_client *client,
	192	const struct i2c_device_id *id)
	193	{
	194	struct pcf8591_data *data;
	195	int err;
1da177e4	196
5263ebb5	197	if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
1da177e4 LT	198	err = -ENOMEM;
	199	goto exit;
	200	}
fb4504fe	201
f741f673	202	i2c_set_clientdata(client, data);
5c085d36	203	mutex_init(&data->update_lock);
1da177e4	204
1da177e4	205	/* Initialize the PCF8591 chip */
f741f673	206	pcf8591_init_client(client);
1da177e4 LT	207
1da177e4 LT	208	/* Register sysfs hooks */
f741f673	209	err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);
7d9db67f	210	if (err)
8b77e6ac	211	goto exit_kfree;
1da177e4 LT	212
1da177e4 LT	213	/* Register input2 if not in "two differential inputs" mode */
7d9db67f	214	if (input_mode != 3) {
f741f673	215	if ((err = device_create_file(&client->dev,
7d9db67f JD	216	&dev_attr_in2_input)))
	217	goto exit_sysfs_remove;
	218	}
	219
1da177e4	220	/* Register input3 only in "four single ended inputs" mode */
7d9db67f	221	if (input_mode == 0) {
f741f673	222	if ((err = device_create_file(&client->dev,
7d9db67f JD	223	&dev_attr_in3_input)))
	224	goto exit_sysfs_remove;
	225	}
	226
4275fcd6 JD	227	data->hwmon_dev = hwmon_device_register(&client->dev);
	228	if (IS_ERR(data->hwmon_dev)) {
	229	err = PTR_ERR(data->hwmon_dev);
	230	goto exit_sysfs_remove;
	231	}
	232
1da177e4	233	return 0;
1da177e4	234
7d9db67f	235	exit_sysfs_remove:
f741f673 JD	236	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
f741f673 JD	237	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
1da177e4 LT	238	exit_kfree:
	239	kfree(data);
	240	exit:
	241	return err;
	242	}
	243
8b77e6ac	244	static int pcf8591_remove(struct i2c_client *client)
1da177e4	245	{
4275fcd6 JD	246	struct pcf8591_data *data = i2c_get_clientdata(client);
	247
	248	hwmon_device_unregister(data->hwmon_dev);
7d9db67f JD	249	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
7d9db67f JD	250	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
1da177e4 LT	251	kfree(i2c_get_clientdata(client));
	252	return 0;
	253	}
	254
	255	/* Called when we have found a new PCF8591. */
	256	static void pcf8591_init_client(struct i2c_client *client)
	257	{
	258	struct pcf8591_data *data = i2c_get_clientdata(client);
	259	data->control = PCF8591_INIT_CONTROL;
	260	data->aout = PCF8591_INIT_AOUT;
	261
	262	i2c_smbus_write_byte_data(client, data->control, data->aout);
fb4504fe JD	263
fb4504fe JD	264	/* The first byte transmitted contains the conversion code of the
1da177e4 LT	265	previous read cycle. FLUSH IT! */
	266	i2c_smbus_read_byte(client);
	267	}
	268
	269	static int pcf8591_read_channel(struct device *dev, int channel)
	270	{
	271	u8 value;
	272	struct i2c_client *client = to_i2c_client(dev);
	273	struct pcf8591_data *data = i2c_get_clientdata(client);
	274
5c085d36	275	mutex_lock(&data->update_lock);
1da177e4 LT	276
	277	if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) {
	278	data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK)
	279	\| channel;
	280	i2c_smbus_write_byte(client, data->control);
fb4504fe JD	281
fb4504fe JD	282	/* The first byte transmitted contains the conversion code of
1da177e4 LT	283	the previous read cycle. FLUSH IT! */
	284	i2c_smbus_read_byte(client);
	285	}
	286	value = i2c_smbus_read_byte(client);
	287
5c085d36	288	mutex_unlock(&data->update_lock);
1da177e4 LT	289
	290	if ((channel == 2 && input_mode == 2) \|\|
	291	(channel != 3 && (input_mode == 1 \|\| input_mode == 3)))
	292	return (10 * REG_TO_SIGNED(value));
	293	else
	294	return (10 * value);
	295	}
	296
8b77e6ac JD	297	static const struct i2c_device_id pcf8591_id[] = {
	298	{ "pcf8591", 0 },
	299	{ }
	300	};
	301	MODULE_DEVICE_TABLE(i2c, pcf8591_id);
	302
	303	static struct i2c_driver pcf8591_driver = {
	304	.driver = {
	305	.name = "pcf8591",
	306	},
	307	.probe = pcf8591_probe,
	308	.remove = pcf8591_remove,
	309	.id_table = pcf8591_id,
	310
	311	.class = I2C_CLASS_HWMON, /* Nearest choice */
	312	.detect = pcf8591_detect,
c3813d6a	313	.address_list = normal_i2c,
8b77e6ac JD	314	};
8b77e6ac JD	315
1da177e4 LT	316	static int __init pcf8591_init(void)
	317	{
	318	if (input_mode < 0 \|\| input_mode > 3) {
	319	printk(KERN_WARNING "pcf8591: invalid input_mode (%d)\n",
	320	input_mode);
	321	input_mode = 0;
	322	}
	323	return i2c_add_driver(&pcf8591_driver);
	324	}
	325
	326	static void __exit pcf8591_exit(void)
	327	{
	328	i2c_del_driver(&pcf8591_driver);
	329	}
	330
	331	MODULE_AUTHOR("Aurelien Jarno <[email protected]>");
	332	MODULE_DESCRIPTION("PCF8591 driver");
	333	MODULE_LICENSE("GPL");
	334
	335	module_init(pcf8591_init);
	336	module_exit(pcf8591_exit);