[linux-2.6] / drivers / hwmon / ltc4215.c

/*
 * Driver for Linear Technology LTC4215 I2C Hot Swap Controller
 *
 * Copyright (C) 2009 Ira W. Snyder <iws@ovro.caltech.edu>
 *
 * 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; version 2 of the License.
 *
 * Datasheet:
 * http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1163,P17572,D12697
 */

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

static const unsigned short normal_i2c[] = { I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(ltc4215);

/* Here are names of the chip's registers (a.k.a. commands) */
enum ltc4215_cmd {
	LTC4215_CONTROL			= 0x00, /* rw */
	LTC4215_ALERT			= 0x01, /* rw */
	LTC4215_STATUS			= 0x02, /* ro */
	LTC4215_FAULT			= 0x03, /* rw */
	LTC4215_SENSE			= 0x04, /* rw */
	LTC4215_SOURCE			= 0x05, /* rw */
	LTC4215_ADIN			= 0x06, /* rw */
};

struct ltc4215_data {
	struct device *hwmon_dev;

	struct mutex update_lock;
	bool valid;
	unsigned long last_updated; /* in jiffies */

	/* Registers */
	u8 regs[7];
};

static struct ltc4215_data *ltc4215_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ltc4215_data *data = i2c_get_clientdata(client);
	s32 val;
	int i;

	mutex_lock(&data->update_lock);

	/* The chip's A/D updates 10 times per second */
	if (time_after(jiffies, data->last_updated + HZ / 10) || !data->valid) {

		dev_dbg(&client->dev, "Starting ltc4215 update\n");

		/* Read all registers */
		for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
			val = i2c_smbus_read_byte_data(client, i);
			if (unlikely(val < 0))
				data->regs[i] = 0;
			else
				data->regs[i] = val;
		}

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/* Return the voltage from the given register in millivolts */
static int ltc4215_get_voltage(struct device *dev, u8 reg)
{
	struct ltc4215_data *data = ltc4215_update_device(dev);
	const u8 regval = data->regs[reg];
	u32 voltage = 0;

	switch (reg) {
	case LTC4215_SENSE:
		/* 151 uV per increment */
		voltage = regval * 151 / 1000;
		break;
	case LTC4215_SOURCE:
		/* 60.5 mV per increment */
		voltage = regval * 605 / 10;
		break;
	case LTC4215_ADIN:
		/* The ADIN input is divided by 12.5, and has 4.82 mV
		 * per increment, so we have the additional multiply */
		voltage = regval * 482 * 125 / 1000;
		break;
	default:
		/* If we get here, the developer messed up */
		WARN_ON_ONCE(1);
		break;
	}

	return voltage;
}

/* Return the current from the sense resistor in mA */
static unsigned int ltc4215_get_current(struct device *dev)
{
	struct ltc4215_data *data = ltc4215_update_device(dev);

	/* The strange looking conversions that follow are fixed-point
	 * math, since we cannot do floating point in the kernel.
	 *
	 * Step 1: convert sense register to microVolts
	 * Step 2: convert voltage to milliAmperes
	 *
	 * If you play around with the V=IR equation, you come up with
	 * the following: X uV / Y mOhm == Z mA
	 *
	 * With the resistors that are fractions of a milliOhm, we multiply
	 * the voltage and resistance by 10, to shift the decimal point.
	 * Now we can use the normal division operator again.
	 */

	/* Calculate voltage in microVolts (151 uV per increment) */
	const unsigned int voltage = data->regs[LTC4215_SENSE] * 151;

	/* Calculate current in milliAmperes (4 milliOhm sense resistor) */
	const unsigned int curr = voltage / 4;

	return curr;
}

static ssize_t ltc4215_show_voltage(struct device *dev,
				    struct device_attribute *da,
				    char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	const int voltage = ltc4215_get_voltage(dev, attr->index);

	return snprintf(buf, PAGE_SIZE, "%d\n", voltage);
}

static ssize_t ltc4215_show_current(struct device *dev,
				    struct device_attribute *da,
				    char *buf)
{
	const unsigned int curr = ltc4215_get_current(dev);

	return snprintf(buf, PAGE_SIZE, "%u\n", curr);
}

static ssize_t ltc4215_show_power(struct device *dev,
				  struct device_attribute *da,
				  char *buf)
{
	const unsigned int curr = ltc4215_get_current(dev);
	const int output_voltage = ltc4215_get_voltage(dev, LTC4215_ADIN);

	/* current in mA * voltage in mV == power in uW */
	const unsigned int power = abs(output_voltage * curr);

	return snprintf(buf, PAGE_SIZE, "%u\n", power);
}

static ssize_t ltc4215_show_alarm(struct device *dev,
					  struct device_attribute *da,
					  char *buf)
{
	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
	struct ltc4215_data *data = ltc4215_update_device(dev);
	const u8 reg = data->regs[attr->index];
	const u32 mask = attr->nr;

	return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0);
}

/* These macros are used below in constructing device attribute objects
 * for use with sysfs_create_group() to make a sysfs device file
 * for each register.
 */

#define LTC4215_VOLTAGE(name, ltc4215_cmd_idx) \
	static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
	ltc4215_show_voltage, NULL, ltc4215_cmd_idx)

#define LTC4215_CURRENT(name) \
	static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
	ltc4215_show_current, NULL, 0);

#define LTC4215_POWER(name) \
	static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
	ltc4215_show_power, NULL, 0);

#define LTC4215_ALARM(name, mask, reg) \
	static SENSOR_DEVICE_ATTR_2(name, S_IRUGO, \
	ltc4215_show_alarm, NULL, (mask), reg)

/* Construct a sensor_device_attribute structure for each register */

/* Current */
LTC4215_CURRENT(curr1_input);
LTC4215_ALARM(curr1_max_alarm,	(1 << 2),	LTC4215_STATUS);

/* Power (virtual) */
LTC4215_POWER(power1_input);
LTC4215_ALARM(power1_alarm,	(1 << 3),	LTC4215_STATUS);

/* Input Voltage */
LTC4215_VOLTAGE(in1_input,			LTC4215_ADIN);
LTC4215_ALARM(in1_max_alarm,	(1 << 0),	LTC4215_STATUS);
LTC4215_ALARM(in1_min_alarm,	(1 << 1),	LTC4215_STATUS);

/* Output Voltage */
LTC4215_VOLTAGE(in2_input,			LTC4215_SOURCE);

/* Finally, construct an array of pointers to members of the above objects,
 * as required for sysfs_create_group()
 */
static struct attribute *ltc4215_attributes[] = {
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,

	&sensor_dev_attr_power1_input.dev_attr.attr,
	&sensor_dev_attr_power1_alarm.dev_attr.attr,

	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_in1_min_alarm.dev_attr.attr,

	&sensor_dev_attr_in2_input.dev_attr.attr,

	NULL,
};

static const struct attribute_group ltc4215_group = {
	.attrs = ltc4215_attributes,
};

static int ltc4215_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct ltc4215_data *data;
	int ret;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data) {
		ret = -ENOMEM;
		goto out_kzalloc;
	}

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

	/* Initialize the LTC4215 chip */
	/* TODO */

	/* Register sysfs hooks */
	ret = sysfs_create_group(&client->dev.kobj, &ltc4215_group);
	if (ret)
		goto out_sysfs_create_group;

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

	return 0;

out_hwmon_device_register:
	sysfs_remove_group(&client->dev.kobj, &ltc4215_group);
out_sysfs_create_group:
	kfree(data);
out_kzalloc:
	return ret;
}

static int ltc4215_remove(struct i2c_client *client)
{
	struct ltc4215_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &ltc4215_group);

	kfree(data);

	return 0;
}

static int ltc4215_detect(struct i2c_client *client,
			  int kind,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;

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

	if (kind < 0) {		/* probed detection - check the chip type */
		s32 v;		/* 8 bits from the chip, or -ERRNO */

		/*
		 * Register 0x01 bit b7 is reserved, expect 0
		 * Register 0x03 bit b6 and b7 are reserved, expect 0
		 */
		v = i2c_smbus_read_byte_data(client, LTC4215_ALERT);
		if (v < 0 || (v & (1 << 7)) != 0)
			return -ENODEV;

		v = i2c_smbus_read_byte_data(client, LTC4215_FAULT);
		if (v < 0 || (v & ((1 << 6) | (1 << 7))) != 0)
				return -ENODEV;
	}

	strlcpy(info->type, "ltc4215", I2C_NAME_SIZE);
	dev_info(&adapter->dev, "ltc4215 %s at address 0x%02x\n",
			kind < 0 ? "probed" : "forced",
			client->addr);

	return 0;
}

static const struct i2c_device_id ltc4215_id[] = {
	{ "ltc4215", ltc4215 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ltc4215_id);

/* This is the driver that will be inserted */
static struct i2c_driver ltc4215_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "ltc4215",
	},
	.probe		= ltc4215_probe,
	.remove		= ltc4215_remove,
	.id_table	= ltc4215_id,
	.detect		= ltc4215_detect,
	.address_data	= &addr_data,
};

static int __init ltc4215_init(void)
{
	return i2c_add_driver(&ltc4215_driver);
}

static void __exit ltc4215_exit(void)
{
	i2c_del_driver(&ltc4215_driver);
}

MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
MODULE_DESCRIPTION("LTC4215 driver");
MODULE_LICENSE("GPL");

module_init(ltc4215_init);
module_exit(ltc4215_exit);
Commit	Line	Data
72f5de92 IS	1	/*
	2	* Driver for Linear Technology LTC4215 I2C Hot Swap Controller
	3	*
	4	* Copyright (C) 2009 Ira W. Snyder <iws@ovro.caltech.edu>
	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; version 2 of the License.
	9	*
	10	* Datasheet:
	11	* http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1163,P17572,D12697
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/err.h>
	18	#include <linux/slab.h>
	19	#include <linux/i2c.h>
	20	#include <linux/hwmon.h>
	21	#include <linux/hwmon-sysfs.h>
	22
	23	static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
	24
	25	/* Insmod parameters */
	26	I2C_CLIENT_INSMOD_1(ltc4215);
	27
	28	/* Here are names of the chip's registers (a.k.a. commands) */
	29	enum ltc4215_cmd {
	30	LTC4215_CONTROL = 0x00, /* rw */
	31	LTC4215_ALERT = 0x01, /* rw */
	32	LTC4215_STATUS = 0x02, /* ro */
	33	LTC4215_FAULT = 0x03, /* rw */
	34	LTC4215_SENSE = 0x04, /* rw */
	35	LTC4215_SOURCE = 0x05, /* rw */
	36	LTC4215_ADIN = 0x06, /* rw */
	37	};
	38
	39	struct ltc4215_data {
	40	struct device *hwmon_dev;
	41
	42	struct mutex update_lock;
	43	bool valid;
	44	unsigned long last_updated; /* in jiffies */
	45
	46	/* Registers */
	47	u8 regs[7];
	48	};
	49
	50	static struct ltc4215_data ltc4215_update_device(struct device dev)
	51	{
	52	struct i2c_client *client = to_i2c_client(dev);
	53	struct ltc4215_data *data = i2c_get_clientdata(client);
	54	s32 val;
	55	int i;
	56
	57	mutex_lock(&data->update_lock);
	58
	59	/* The chip's A/D updates 10 times per second */
	60	if (time_after(jiffies, data->last_updated + HZ / 10) \|\| !data->valid) {
	61
	62	dev_dbg(&client->dev, "Starting ltc4215 update\n");
	63
	64	/* Read all registers */
65	for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
66	val = i2c_smbus_read_byte_data(client, i);
67	if (unlikely(val < 0))
68	data->regs[i] = 0;
69	else
70	data->regs[i] = val;
71	}
72
73	data->last_updated = jiffies;
74	data->valid = 1;
75	}
76
77	mutex_unlock(&data->update_lock);
78
79	return data;
80	}
81
82	/* Return the voltage from the given register in millivolts */
83	static int ltc4215_get_voltage(struct device *dev, u8 reg)
84	{
85	struct ltc4215_data *data = ltc4215_update_device(dev);
86	const u8 regval = data->regs[reg];
87	u32 voltage = 0;
88
89	switch (reg) {
90	case LTC4215_SENSE:
91	/* 151 uV per increment */
92	voltage = regval * 151 / 1000;
93	break;
94	case LTC4215_SOURCE:
95	/* 60.5 mV per increment */
96	voltage = regval * 605 / 10;
97	break;
98	case LTC4215_ADIN:
99	/* The ADIN input is divided by 12.5, and has 4.82 mV
100	* per increment, so we have the additional multiply */
101	voltage = regval * 482 * 125 / 1000;
102	break;
103	default:
104	/* If we get here, the developer messed up */
105	WARN_ON_ONCE(1);
106	break;
107	}
108
109	return voltage;
110	}
111
112	/* Return the current from the sense resistor in mA */
113	static unsigned int ltc4215_get_current(struct device *dev)
114	{
115	struct ltc4215_data *data = ltc4215_update_device(dev);
116
117	/* The strange looking conversions that follow are fixed-point
118	* math, since we cannot do floating point in the kernel.
119	*
120	* Step 1: convert sense register to microVolts
121	* Step 2: convert voltage to milliAmperes
122	*
123	* If you play around with the V=IR equation, you come up with
124	* the following: X uV / Y mOhm == Z mA
125	*
126	* With the resistors that are fractions of a milliOhm, we multiply
127	* the voltage and resistance by 10, to shift the decimal point.
128	* Now we can use the normal division operator again.
129	*/
130
131	/* Calculate voltage in microVolts (151 uV per increment) */
132	const unsigned int voltage = data->regs[LTC4215_SENSE] * 151;
133
134	/* Calculate current in milliAmperes (4 milliOhm sense resistor) */
135	const unsigned int curr = voltage / 4;
136
137	return curr;
138	}
139
140	static ssize_t ltc4215_show_voltage(struct device *dev,
141	struct device_attribute *da,
142	char *buf)
143	{
144	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
145	const int voltage = ltc4215_get_voltage(dev, attr->index);
146
147	return snprintf(buf, PAGE_SIZE, "%d\n", voltage);
148	}
149
150	static ssize_t ltc4215_show_current(struct device *dev,
151	struct device_attribute *da,
152	char *buf)
153	{
154	const unsigned int curr = ltc4215_get_current(dev);
155
156	return snprintf(buf, PAGE_SIZE, "%u\n", curr);
157	}
158
159	static ssize_t ltc4215_show_power(struct device *dev,
160	struct device_attribute *da,
161	char *buf)
162	{
163	const unsigned int curr = ltc4215_get_current(dev);
164	const int output_voltage = ltc4215_get_voltage(dev, LTC4215_ADIN);
165
166	/* current in mA * voltage in mV == power in uW */
167	const unsigned int power = abs(output_voltage * curr);
168
169	return snprintf(buf, PAGE_SIZE, "%u\n", power);
170	}
171
172	static ssize_t ltc4215_show_alarm(struct device *dev,
173	struct device_attribute *da,
174	char *buf)
175	{
176	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
177	struct ltc4215_data *data = ltc4215_update_device(dev);
178	const u8 reg = data->regs[attr->index];
179	const u32 mask = attr->nr;
180
181	return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0);
182	}
183
184	/* These macros are used below in constructing device attribute objects
185	* for use with sysfs_create_group() to make a sysfs device file
186	* for each register.
187	*/
188
189	#define LTC4215_VOLTAGE(name, ltc4215_cmd_idx) \
190	static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
191	ltc4215_show_voltage, NULL, ltc4215_cmd_idx)
192
193	#define LTC4215_CURRENT(name) \
194	static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
195	ltc4215_show_current, NULL, 0);
196
197	#define LTC4215_POWER(name) \
198	static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
199	ltc4215_show_power, NULL, 0);
200
201	#define LTC4215_ALARM(name, mask, reg) \
202	static SENSOR_DEVICE_ATTR_2(name, S_IRUGO, \
203	ltc4215_show_alarm, NULL, (mask), reg)
204
205	/* Construct a sensor_device_attribute structure for each register */
206
207	/* Current */
208	LTC4215_CURRENT(curr1_input);
209	LTC4215_ALARM(curr1_max_alarm, (1 << 2), LTC4215_STATUS);
210
211	/* Power (virtual) */
212	LTC4215_POWER(power1_input);
213	LTC4215_ALARM(power1_alarm, (1 << 3), LTC4215_STATUS);
214
215	/* Input Voltage */
216	LTC4215_VOLTAGE(in1_input, LTC4215_ADIN);
217	LTC4215_ALARM(in1_max_alarm, (1 << 0), LTC4215_STATUS);
218	LTC4215_ALARM(in1_min_alarm, (1 << 1), LTC4215_STATUS);
219
220	/* Output Voltage */
221	LTC4215_VOLTAGE(in2_input, LTC4215_SOURCE);
222
223	/* Finally, construct an array of pointers to members of the above objects,
224	* as required for sysfs_create_group()
225	*/
226	static struct attribute *ltc4215_attributes[] = {
227	&sensor_dev_attr_curr1_input.dev_attr.attr,
228	&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
229
230	&sensor_dev_attr_power1_input.dev_attr.attr,
231	&sensor_dev_attr_power1_alarm.dev_attr.attr,
232
233	&sensor_dev_attr_in1_input.dev_attr.attr,
234	&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
235	&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
236
237	&sensor_dev_attr_in2_input.dev_attr.attr,
238
239	NULL,
240	};
241
242	static const struct attribute_group ltc4215_group = {
243	.attrs = ltc4215_attributes,
244	};
245
246	static int ltc4215_probe(struct i2c_client *client,
247	const struct i2c_device_id *id)
248	{
249	struct ltc4215_data *data;
250	int ret;
251
252	data = kzalloc(sizeof(*data), GFP_KERNEL);
253	if (!data) {
254	ret = -ENOMEM;
255	goto out_kzalloc;
256	}
257
258	i2c_set_clientdata(client, data);
259	mutex_init(&data->update_lock);
260
261	/* Initialize the LTC4215 chip */
262	/* TODO */
263
264	/* Register sysfs hooks */
265	ret = sysfs_create_group(&client->dev.kobj, &ltc4215_group);
266	if (ret)
267	goto out_sysfs_create_group;
268
269	data->hwmon_dev = hwmon_device_register(&client->dev);
270	if (IS_ERR(data->hwmon_dev)) {
271	ret = PTR_ERR(data->hwmon_dev);
272	goto out_hwmon_device_register;
273	}
274
275	return 0;
276
277	out_hwmon_device_register:
278	sysfs_remove_group(&client->dev.kobj, &ltc4215_group);
279	out_sysfs_create_group:
280	kfree(data);
281	out_kzalloc:
282	return ret;
283	}
284
285	static int ltc4215_remove(struct i2c_client *client)
286	{
287	struct ltc4215_data *data = i2c_get_clientdata(client);
288
289	hwmon_device_unregister(data->hwmon_dev);
290	sysfs_remove_group(&client->dev.kobj, &ltc4215_group);
291
292	kfree(data);
293
294	return 0;
295	}
296
297	static int ltc4215_detect(struct i2c_client *client,
298	int kind,
299	struct i2c_board_info *info)
300	{
301	struct i2c_adapter *adapter = client->adapter;
302
303	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
304	return -ENODEV;
305
306	if (kind < 0) { /* probed detection - check the chip type */
307	s32 v; /* 8 bits from the chip, or -ERRNO */
308
309	/*
310	* Register 0x01 bit b7 is reserved, expect 0
311	* Register 0x03 bit b6 and b7 are reserved, expect 0
312	*/
313	v = i2c_smbus_read_byte_data(client, LTC4215_ALERT);
314	if (v < 0 \|\| (v & (1 << 7)) != 0)
315	return -ENODEV;
316
317	v = i2c_smbus_read_byte_data(client, LTC4215_FAULT);
318	if (v < 0 \|\| (v & ((1 << 6) \| (1 << 7))) != 0)
319	return -ENODEV;
320	}
321
322	strlcpy(info->type, "ltc4215", I2C_NAME_SIZE);
323	dev_info(&adapter->dev, "ltc4215 %s at address 0x%02x\n",
324	kind < 0 ? "probed" : "forced",
325	client->addr);
326
327	return 0;
328	}
329
330	static const struct i2c_device_id ltc4215_id[] = {
331	{ "ltc4215", ltc4215 },
332	{ }
333	};
334	MODULE_DEVICE_TABLE(i2c, ltc4215_id);
335
336	/* This is the driver that will be inserted */
337	static struct i2c_driver ltc4215_driver = {
338	.class = I2C_CLASS_HWMON,
339	.driver = {
340	.name = "ltc4215",
341	},
342	.probe = ltc4215_probe,
343	.remove = ltc4215_remove,
344	.id_table = ltc4215_id,
345	.detect = ltc4215_detect,
346	.address_data = &addr_data,
347	};
348
349	static int __init ltc4215_init(void)
350	{
351	return i2c_add_driver(&ltc4215_driver);
352	}
353
354	static void __exit ltc4215_exit(void)
355	{
356	i2c_del_driver(&ltc4215_driver);
357	}
358
359	MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
360	MODULE_DESCRIPTION("LTC4215 driver");
361	MODULE_LICENSE("GPL");
362
363	module_init(ltc4215_init);
364	module_exit(ltc4215_exit);