[net-next-2.6.git] / drivers / hwmon / pcf8591.c

/*
    Copyright (C) 2001-2004 Aurelien Jarno <aurelien@aurel32.net>
    Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
    the help of Jean Delvare <khali@linux-fr.org>

    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>

/* 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 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;
	}

	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)
{
	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 <aurelien@aurel32.net>");
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 <aurelien@aurel32.net>
fb4504fe	3	Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
1da177e4 LT	4	the help of Jean Delvare <khali@linux-fr.org>
	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>
1da177e4 LT	26
1da177e4 LT	27	/* Addresses to scan */
2cdddeb8	28	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
1da177e4	29	0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
1da177e4 LT	30
1da177e4 LT	31	/* Insmod parameters */
1da177e4 LT	32
	33	static int input_mode;
	34	module_param(input_mode, int, 0);
	35	MODULE_PARM_DESC(input_mode,
	36	"Analog input mode:\n"
	37	" 0 = four single ended inputs\n"
	38	" 1 = three differential inputs\n"
	39	" 2 = single ended and differential mixed\n"
	40	" 3 = two differential inputs\n");
	41
	42	/* The PCF8591 control byte
fb4504fe	43	7 6 5 4 3 2 1 0
1da177e4 LT	44	\| 0 \|AOEF\| AIP \| 0 \|AINC\| AICH \| */
	45
	46	/* Analog Output Enable Flag (analog output active if 1) */
	47	#define PCF8591_CONTROL_AOEF 0x40
fb4504fe JD	48
fb4504fe JD	49	/* Analog Input Programming
1da177e4 LT	50	0x00 = four single ended inputs
	51	0x10 = three differential inputs
	52	0x20 = single ended and differential mixed
	53	0x30 = two differential inputs */
	54	#define PCF8591_CONTROL_AIP_MASK 0x30
	55
	56	/* Autoincrement Flag (switch on if 1) */
	57	#define PCF8591_CONTROL_AINC 0x04
	58
	59	/* Channel selection
fb4504fe	60	0x00 = channel 0
1da177e4 LT	61	0x01 = channel 1
	62	0x02 = channel 2
	63	0x03 = channel 3 */
	64	#define PCF8591_CONTROL_AICH_MASK 0x03
	65
	66	/* Initial values */
	67	#define PCF8591_INIT_CONTROL ((input_mode << 4) \| PCF8591_CONTROL_AOEF)
	68	#define PCF8591_INIT_AOUT 0 /* DAC out = 0 */
	69
	70	/* Conversions */
	71	#define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg))
	72
	73	struct pcf8591_data {
5c085d36	74	struct mutex update_lock;
1da177e4 LT	75
	76	u8 control;
	77	u8 aout;
	78	};
	79
1da177e4 LT	80	static void pcf8591_init_client(struct i2c_client *client);
	81	static int pcf8591_read_channel(struct device *dev, int channel);
	82
1da177e4 LT	83	/* following are the sysfs callback functions */
1da177e4 LT	84	#define show_in_channel(channel) \
a5099cfc	85	static ssize_t show_in##channel##_input(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	86	{ \
	87	return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
	88	} \
	89	static DEVICE_ATTR(in##channel##_input, S_IRUGO, \
	90	show_in##channel##_input, NULL);
	91
	92	show_in_channel(0);
	93	show_in_channel(1);
	94	show_in_channel(2);
	95	show_in_channel(3);
	96
a5099cfc	97	static ssize_t show_out0_ouput(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	98	{
	99	struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
	100	return sprintf(buf, "%d\n", data->aout * 10);
	101	}
	102
a5099cfc	103	static ssize_t set_out0_output(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	104	{
	105	unsigned int value;
	106	struct i2c_client *client = to_i2c_client(dev);
	107	struct pcf8591_data *data = i2c_get_clientdata(client);
	108	if ((value = (simple_strtoul(buf, NULL, 10) + 5) / 10) <= 255) {
	109	data->aout = value;
	110	i2c_smbus_write_byte_data(client, data->control, data->aout);
	111	return count;
	112	}
	113	return -EINVAL;
	114	}
	115
fb4504fe	116	static DEVICE_ATTR(out0_output, S_IWUSR \| S_IRUGO,
1da177e4 LT	117	show_out0_ouput, set_out0_output);
1da177e4 LT	118
a5099cfc	119	static ssize_t show_out0_enable(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	120	{
	121	struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
	122	return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF)));
	123	}
	124
a5099cfc	125	static ssize_t set_out0_enable(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	126	{
	127	struct i2c_client *client = to_i2c_client(dev);
	128	struct pcf8591_data *data = i2c_get_clientdata(client);
	129	unsigned long val = simple_strtoul(buf, NULL, 10);
	130
5c085d36	131	mutex_lock(&data->update_lock);
1da177e4 LT	132	if (val)
	133	data->control \|= PCF8591_CONTROL_AOEF;
	134	else
	135	data->control &= ~PCF8591_CONTROL_AOEF;
	136	i2c_smbus_write_byte(client, data->control);
5c085d36	137	mutex_unlock(&data->update_lock);
1da177e4 LT	138	return count;
	139	}
	140
fb4504fe	141	static DEVICE_ATTR(out0_enable, S_IWUSR \| S_IRUGO,
1da177e4 LT	142	show_out0_enable, set_out0_enable);
1da177e4 LT	143
7d9db67f JD	144	static struct attribute *pcf8591_attributes[] = {
	145	&dev_attr_out0_enable.attr,
	146	&dev_attr_out0_output.attr,
	147	&dev_attr_in0_input.attr,
	148	&dev_attr_in1_input.attr,
	149	NULL
	150	};
	151
	152	static const struct attribute_group pcf8591_attr_group = {
	153	.attrs = pcf8591_attributes,
	154	};
	155
	156	static struct attribute *pcf8591_attributes_opt[] = {
	157	&dev_attr_in2_input.attr,
	158	&dev_attr_in3_input.attr,
	159	NULL
	160	};
	161
	162	static const struct attribute_group pcf8591_attr_group_opt = {
	163	.attrs = pcf8591_attributes_opt,
	164	};
	165
1da177e4 LT	166	/*
	167	* Real code
	168	*/
1da177e4	169
8b77e6ac	170	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	171	static int pcf8591_detect(struct i2c_client *client,
8b77e6ac	172	struct i2c_board_info *info)
1da177e4	173	{
8b77e6ac	174	struct i2c_adapter *adapter = client->adapter;
1da177e4 LT	175
	176	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE
	177	\| I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
8b77e6ac JD	178	return -ENODEV;
	179
	180	/* Now, we would do the remaining detection. But the PCF8591 is plainly
	181	impossible to detect! Stupid chip. */
	182
	183	strlcpy(info->type, "pcf8591", I2C_NAME_SIZE);
	184
	185	return 0;
	186	}
	187
	188	static int pcf8591_probe(struct i2c_client *client,
	189	const struct i2c_device_id *id)
	190	{
	191	struct pcf8591_data *data;
	192	int err;
1da177e4	193
5263ebb5	194	if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
1da177e4 LT	195	err = -ENOMEM;
	196	goto exit;
	197	}
fb4504fe	198
f741f673	199	i2c_set_clientdata(client, data);
5c085d36	200	mutex_init(&data->update_lock);
1da177e4	201
1da177e4	202	/* Initialize the PCF8591 chip */
f741f673	203	pcf8591_init_client(client);
1da177e4 LT	204
1da177e4 LT	205	/* Register sysfs hooks */
f741f673	206	err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);
7d9db67f	207	if (err)
8b77e6ac	208	goto exit_kfree;
1da177e4 LT	209
1da177e4 LT	210	/* Register input2 if not in "two differential inputs" mode */
7d9db67f	211	if (input_mode != 3) {
f741f673	212	if ((err = device_create_file(&client->dev,
7d9db67f JD	213	&dev_attr_in2_input)))
	214	goto exit_sysfs_remove;
	215	}
	216
1da177e4	217	/* Register input3 only in "four single ended inputs" mode */
7d9db67f	218	if (input_mode == 0) {
f741f673	219	if ((err = device_create_file(&client->dev,
7d9db67f JD	220	&dev_attr_in3_input)))
	221	goto exit_sysfs_remove;
	222	}
	223
1da177e4	224	return 0;
1da177e4	225
7d9db67f	226	exit_sysfs_remove:
f741f673 JD	227	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
f741f673 JD	228	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
1da177e4 LT	229	exit_kfree:
	230	kfree(data);
	231	exit:
	232	return err;
	233	}
	234
8b77e6ac	235	static int pcf8591_remove(struct i2c_client *client)
1da177e4	236	{
7d9db67f JD	237	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
7d9db67f JD	238	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
1da177e4 LT	239	kfree(i2c_get_clientdata(client));
	240	return 0;
	241	}
	242
	243	/* Called when we have found a new PCF8591. */
	244	static void pcf8591_init_client(struct i2c_client *client)
	245	{
	246	struct pcf8591_data *data = i2c_get_clientdata(client);
	247	data->control = PCF8591_INIT_CONTROL;
	248	data->aout = PCF8591_INIT_AOUT;
	249
	250	i2c_smbus_write_byte_data(client, data->control, data->aout);
fb4504fe JD	251
fb4504fe JD	252	/* The first byte transmitted contains the conversion code of the
1da177e4 LT	253	previous read cycle. FLUSH IT! */
	254	i2c_smbus_read_byte(client);
	255	}
	256
	257	static int pcf8591_read_channel(struct device *dev, int channel)
	258	{
	259	u8 value;
	260	struct i2c_client *client = to_i2c_client(dev);
	261	struct pcf8591_data *data = i2c_get_clientdata(client);
	262
5c085d36	263	mutex_lock(&data->update_lock);
1da177e4 LT	264
	265	if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) {
	266	data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK)
	267	\| channel;
	268	i2c_smbus_write_byte(client, data->control);
fb4504fe JD	269
fb4504fe JD	270	/* The first byte transmitted contains the conversion code of
1da177e4 LT	271	the previous read cycle. FLUSH IT! */
	272	i2c_smbus_read_byte(client);
	273	}
	274	value = i2c_smbus_read_byte(client);
	275
5c085d36	276	mutex_unlock(&data->update_lock);
1da177e4 LT	277
	278	if ((channel == 2 && input_mode == 2) \|\|
	279	(channel != 3 && (input_mode == 1 \|\| input_mode == 3)))
	280	return (10 * REG_TO_SIGNED(value));
	281	else
	282	return (10 * value);
	283	}
	284
8b77e6ac JD	285	static const struct i2c_device_id pcf8591_id[] = {
	286	{ "pcf8591", 0 },
	287	{ }
	288	};
	289	MODULE_DEVICE_TABLE(i2c, pcf8591_id);
	290
	291	static struct i2c_driver pcf8591_driver = {
	292	.driver = {
	293	.name = "pcf8591",
	294	},
	295	.probe = pcf8591_probe,
	296	.remove = pcf8591_remove,
	297	.id_table = pcf8591_id,
	298
	299	.class = I2C_CLASS_HWMON, /* Nearest choice */
	300	.detect = pcf8591_detect,
c3813d6a	301	.address_list = normal_i2c,
8b77e6ac JD	302	};
8b77e6ac JD	303
1da177e4 LT	304	static int __init pcf8591_init(void)
	305	{
	306	if (input_mode < 0 \|\| input_mode > 3) {
	307	printk(KERN_WARNING "pcf8591: invalid input_mode (%d)\n",
	308	input_mode);
	309	input_mode = 0;
	310	}
	311	return i2c_add_driver(&pcf8591_driver);
	312	}
	313
	314	static void __exit pcf8591_exit(void)
	315	{
	316	i2c_del_driver(&pcf8591_driver);
	317	}
	318
	319	MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>");
	320	MODULE_DESCRIPTION("PCF8591 driver");
	321	MODULE_LICENSE("GPL");
	322
	323	module_init(pcf8591_init);
	324	module_exit(pcf8591_exit);