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  1/*
  2 * LM73 Sensor driver
  3 * Based on LM75
  4 *
  5 * Copyright (C) 2007, CenoSYS (www.cenosys.com).
  6 * Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
  7 *
  8 * Guillaume Ligneul <guillaume.ligneul@gmail.com>
  9 * Adrien Demarez <adrien.demarez@bolloretelecom.eu>
 10 * Jeremy Laine <jeremy.laine@bolloretelecom.eu>
 11 * Chris Verges <kg4ysn@gmail.com>
 12 *
 13 * This software program is licensed subject to the GNU General Public License
 14 * (GPL).Version 2,June 1991, available at
 15 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 16 */
 17
 18#include <linux/module.h>
 19#include <linux/init.h>
 20#include <linux/i2c.h>
 21#include <linux/hwmon.h>
 22#include <linux/hwmon-sysfs.h>
 23#include <linux/err.h>
 24
 25
 26/* Addresses scanned */
 27static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
 28					0x4d, 0x4e, I2C_CLIENT_END };
 29
 30/* LM73 registers */
 31#define LM73_REG_INPUT		0x00
 32#define LM73_REG_CONF		0x01
 33#define LM73_REG_MAX		0x02
 34#define LM73_REG_MIN		0x03
 35#define LM73_REG_CTRL		0x04
 36#define LM73_REG_ID		0x07
 37
 38#define LM73_ID			0x9001	/* 0x0190, byte-swapped */
 39#define DRVNAME			"lm73"
 40#define LM73_TEMP_MIN		(-256000 / 250)
 41#define LM73_TEMP_MAX		(255750 / 250)
 42
 43#define LM73_CTRL_RES_SHIFT	5
 44#define LM73_CTRL_RES_MASK	(BIT(5) | BIT(6))
 45#define LM73_CTRL_TO_MASK	BIT(7)
 46
 47#define LM73_CTRL_HI_SHIFT	2
 48#define LM73_CTRL_LO_SHIFT	1
 49
 50static const unsigned short lm73_convrates[] = {
 51	14,	/* 11-bits (0.25000 C/LSB): RES1 Bit = 0, RES0 Bit = 0 */
 52	28,	/* 12-bits (0.12500 C/LSB): RES1 Bit = 0, RES0 Bit = 1 */
 53	56,	/* 13-bits (0.06250 C/LSB): RES1 Bit = 1, RES0 Bit = 0 */
 54	112,	/* 14-bits (0.03125 C/LSB): RES1 Bit = 1, RES0 Bit = 1 */
 55};
 56
 57struct lm73_data {
 58	struct i2c_client *client;
 59	struct mutex lock;
 60	u8 ctrl;			/* control register value */
 61};
 62
 63/*-----------------------------------------------------------------------*/
 64
 
 65static ssize_t set_temp(struct device *dev, struct device_attribute *da,
 66			const char *buf, size_t count)
 67{
 68	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 69	struct lm73_data *data = dev_get_drvdata(dev);
 70	long temp;
 71	short value;
 72	s32 err;
 73
 74	int status = kstrtol(buf, 10, &temp);
 75	if (status < 0)
 76		return status;
 77
 78	/* Write value */
 79	value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5;
 80	err = i2c_smbus_write_word_swapped(data->client, attr->index, value);
 81	return (err < 0) ? err : count;
 
 82}
 83
 84static ssize_t show_temp(struct device *dev, struct device_attribute *da,
 85			 char *buf)
 86{
 87	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 88	struct lm73_data *data = dev_get_drvdata(dev);
 89	int temp;
 90
 91	s32 err = i2c_smbus_read_word_swapped(data->client, attr->index);
 92	if (err < 0)
 93		return err;
 94
 95	/* use integer division instead of equivalent right shift to
 96	   guarantee arithmetic shift and preserve the sign */
 97	temp = (((s16) err) * 250) / 32;
 98	return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
 
 99}
100
101static ssize_t set_convrate(struct device *dev, struct device_attribute *da,
102			    const char *buf, size_t count)
103{
104	struct lm73_data *data = dev_get_drvdata(dev);
105	unsigned long convrate;
106	s32 err;
107	int res = 0;
108
109	err = kstrtoul(buf, 10, &convrate);
110	if (err < 0)
111		return err;
112
113	/*
114	 * Convert the desired conversion rate into register bits.
115	 * res is already initialized, and everything past the second-to-last
116	 * value in the array is treated as belonging to the last value
117	 * in the array.
118	 */
119	while (res < (ARRAY_SIZE(lm73_convrates) - 1) &&
120			convrate > lm73_convrates[res])
121		res++;
122
123	mutex_lock(&data->lock);
124	data->ctrl &= LM73_CTRL_TO_MASK;
125	data->ctrl |= res << LM73_CTRL_RES_SHIFT;
126	err = i2c_smbus_write_byte_data(data->client, LM73_REG_CTRL,
127					data->ctrl);
128	mutex_unlock(&data->lock);
129
130	if (err < 0)
131		return err;
132
133	return count;
134}
135
136static ssize_t show_convrate(struct device *dev, struct device_attribute *da,
137			     char *buf)
138{
139	struct lm73_data *data = dev_get_drvdata(dev);
140	int res;
141
142	res = (data->ctrl & LM73_CTRL_RES_MASK) >> LM73_CTRL_RES_SHIFT;
143	return scnprintf(buf, PAGE_SIZE, "%hu\n", lm73_convrates[res]);
144}
145
146static ssize_t show_maxmin_alarm(struct device *dev,
147				 struct device_attribute *da, char *buf)
148{
149	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
150	struct lm73_data *data = dev_get_drvdata(dev);
151	s32 ctrl;
152
153	mutex_lock(&data->lock);
154	ctrl = i2c_smbus_read_byte_data(data->client, LM73_REG_CTRL);
155	if (ctrl < 0)
156		goto abort;
157	data->ctrl = ctrl;
158	mutex_unlock(&data->lock);
159
160	return scnprintf(buf, PAGE_SIZE, "%d\n", (ctrl >> attr->index) & 1);
161
162abort:
163	mutex_unlock(&data->lock);
164	return ctrl;
165}
166
167/*-----------------------------------------------------------------------*/
168
169/* sysfs attributes for hwmon */
170
171static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
172			show_temp, set_temp, LM73_REG_MAX);
173static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
174			show_temp, set_temp, LM73_REG_MIN);
175static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
176			show_temp, NULL, LM73_REG_INPUT);
177static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
178			show_convrate, set_convrate, 0);
179static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
180			show_maxmin_alarm, NULL, LM73_CTRL_HI_SHIFT);
181static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
182			show_maxmin_alarm, NULL, LM73_CTRL_LO_SHIFT);
183
184static struct attribute *lm73_attrs[] = {
 
185	&sensor_dev_attr_temp1_input.dev_attr.attr,
186	&sensor_dev_attr_temp1_max.dev_attr.attr,
187	&sensor_dev_attr_temp1_min.dev_attr.attr,
188	&sensor_dev_attr_update_interval.dev_attr.attr,
189	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
190	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
191	NULL
192};
193ATTRIBUTE_GROUPS(lm73);
 
 
 
194
195/*-----------------------------------------------------------------------*/
196
197/* device probe and removal */
198
199static int
200lm73_probe(struct i2c_client *client, const struct i2c_device_id *id)
201{
202	struct device *dev = &client->dev;
203	struct device *hwmon_dev;
204	struct lm73_data *data;
205	int ctrl;
 
 
 
 
206
207	data = devm_kzalloc(dev, sizeof(struct lm73_data), GFP_KERNEL);
208	if (!data)
209		return -ENOMEM;
210
211	data->client = client;
212	mutex_init(&data->lock);
213
214	ctrl = i2c_smbus_read_byte_data(client, LM73_REG_CTRL);
215	if (ctrl < 0)
216		return ctrl;
217	data->ctrl = ctrl;
218
219	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
220							   data, lm73_groups);
221	if (IS_ERR(hwmon_dev))
222		return PTR_ERR(hwmon_dev);
223
224	dev_info(dev, "sensor '%s'\n", client->name);
 
 
 
 
 
 
 
 
 
 
 
 
225
 
 
226	return 0;
227}
228
229static const struct i2c_device_id lm73_ids[] = {
230	{ "lm73", 0 },
231	{ /* LIST END */ }
232};
233MODULE_DEVICE_TABLE(i2c, lm73_ids);
234
235/* Return 0 if detection is successful, -ENODEV otherwise */
236static int lm73_detect(struct i2c_client *new_client,
237			struct i2c_board_info *info)
238{
239	struct i2c_adapter *adapter = new_client->adapter;
240	int id, ctrl, conf;
241
242	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
243					I2C_FUNC_SMBUS_WORD_DATA))
244		return -ENODEV;
245
246	/*
247	 * Do as much detection as possible with byte reads first, as word
248	 * reads can confuse other devices.
249	 */
250	ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
251	if (ctrl < 0 || (ctrl & 0x10))
252		return -ENODEV;
253
254	conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
255	if (conf < 0 || (conf & 0x0c))
256		return -ENODEV;
257
258	id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
259	if (id < 0 || id != (LM73_ID & 0xff))
260		return -ENODEV;
261
262	/* Check device ID */
263	id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
264	if (id < 0 || id != LM73_ID)
265		return -ENODEV;
266
267	strlcpy(info->type, "lm73", I2C_NAME_SIZE);
268
269	return 0;
270}
271
272static struct i2c_driver lm73_driver = {
273	.class		= I2C_CLASS_HWMON,
274	.driver = {
275		.name	= "lm73",
276	},
277	.probe		= lm73_probe,
 
278	.id_table	= lm73_ids,
279	.detect		= lm73_detect,
280	.address_list	= normal_i2c,
281};
282
283module_i2c_driver(lm73_driver);
284
285MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
286MODULE_DESCRIPTION("LM73 driver");
287MODULE_LICENSE("GPL");
  1/*
  2 * LM73 Sensor driver
  3 * Based on LM75
  4 *
  5 * Copyright (C) 2007, CenoSYS (www.cenosys.com).
  6 * Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
  7 *
  8 * Guillaume Ligneul <guillaume.ligneul@gmail.com>
  9 * Adrien Demarez <adrien.demarez@bolloretelecom.eu>
 10 * Jeremy Laine <jeremy.laine@bolloretelecom.eu>
 
 11 *
 12 * This software program is licensed subject to the GNU General Public License
 13 * (GPL).Version 2,June 1991, available at
 14 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 15 */
 16
 17#include <linux/module.h>
 18#include <linux/init.h>
 19#include <linux/i2c.h>
 20#include <linux/hwmon.h>
 21#include <linux/hwmon-sysfs.h>
 22#include <linux/err.h>
 23
 24
 25/* Addresses scanned */
 26static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
 27					0x4d, 0x4e, I2C_CLIENT_END };
 28
 29/* LM73 registers */
 30#define LM73_REG_INPUT		0x00
 31#define LM73_REG_CONF		0x01
 32#define LM73_REG_MAX		0x02
 33#define LM73_REG_MIN		0x03
 34#define LM73_REG_CTRL		0x04
 35#define LM73_REG_ID		0x07
 36
 37#define LM73_ID			0x9001	/* 0x0190, byte-swapped */
 38#define DRVNAME			"lm73"
 39#define LM73_TEMP_MIN		(-40)
 40#define LM73_TEMP_MAX		150
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 41
 42/*-----------------------------------------------------------------------*/
 43
 44
 45static ssize_t set_temp(struct device *dev, struct device_attribute *da,
 46			const char *buf, size_t count)
 47{
 48	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 49	struct i2c_client *client = to_i2c_client(dev);
 50	long temp;
 51	short value;
 
 52
 53	int status = kstrtol(buf, 10, &temp);
 54	if (status < 0)
 55		return status;
 56
 57	/* Write value */
 58	value = (short) SENSORS_LIMIT(temp/250, (LM73_TEMP_MIN*4),
 59		(LM73_TEMP_MAX*4)) << 5;
 60	i2c_smbus_write_word_swapped(client, attr->index, value);
 61	return count;
 62}
 63
 64static ssize_t show_temp(struct device *dev, struct device_attribute *da,
 65			 char *buf)
 66{
 67	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 68	struct i2c_client *client = to_i2c_client(dev);
 
 
 
 
 
 
 69	/* use integer division instead of equivalent right shift to
 70	   guarantee arithmetic shift and preserve the sign */
 71	int temp = ((s16) (i2c_smbus_read_word_swapped(client,
 72		    attr->index))*250) / 32;
 73	return sprintf(buf, "%d\n", temp);
 74}
 75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 76
 77/*-----------------------------------------------------------------------*/
 78
 79/* sysfs attributes for hwmon */
 80
 81static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
 82			show_temp, set_temp, LM73_REG_MAX);
 83static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
 84			show_temp, set_temp, LM73_REG_MIN);
 85static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 86			show_temp, NULL, LM73_REG_INPUT);
 
 
 
 
 
 
 87
 88
 89static struct attribute *lm73_attributes[] = {
 90	&sensor_dev_attr_temp1_input.dev_attr.attr,
 91	&sensor_dev_attr_temp1_max.dev_attr.attr,
 92	&sensor_dev_attr_temp1_min.dev_attr.attr,
 93
 
 
 94	NULL
 95};
 96
 97static const struct attribute_group lm73_group = {
 98	.attrs = lm73_attributes,
 99};
100
101/*-----------------------------------------------------------------------*/
102
103/* device probe and removal */
104
105static int
106lm73_probe(struct i2c_client *client, const struct i2c_device_id *id)
107{
 
108	struct device *hwmon_dev;
109	int status;
110
111	/* Register sysfs hooks */
112	status = sysfs_create_group(&client->dev.kobj, &lm73_group);
113	if (status)
114		return status;
115
116	hwmon_dev = hwmon_device_register(&client->dev);
117	if (IS_ERR(hwmon_dev)) {
118		status = PTR_ERR(hwmon_dev);
119		goto exit_remove;
120	}
121	i2c_set_clientdata(client, hwmon_dev);
 
 
 
 
 
 
 
 
 
 
122
123	dev_info(&client->dev, "%s: sensor '%s'\n",
124		 dev_name(hwmon_dev), client->name);
125
126	return 0;
127
128exit_remove:
129	sysfs_remove_group(&client->dev.kobj, &lm73_group);
130	return status;
131}
132
133static int lm73_remove(struct i2c_client *client)
134{
135	struct device *hwmon_dev = i2c_get_clientdata(client);
136
137	hwmon_device_unregister(hwmon_dev);
138	sysfs_remove_group(&client->dev.kobj, &lm73_group);
139	return 0;
140}
141
142static const struct i2c_device_id lm73_ids[] = {
143	{ "lm73", 0 },
144	{ /* LIST END */ }
145};
146MODULE_DEVICE_TABLE(i2c, lm73_ids);
147
148/* Return 0 if detection is successful, -ENODEV otherwise */
149static int lm73_detect(struct i2c_client *new_client,
150			struct i2c_board_info *info)
151{
152	struct i2c_adapter *adapter = new_client->adapter;
153	int id, ctrl, conf;
154
155	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
156					I2C_FUNC_SMBUS_WORD_DATA))
157		return -ENODEV;
158
159	/*
160	 * Do as much detection as possible with byte reads first, as word
161	 * reads can confuse other devices.
162	 */
163	ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
164	if (ctrl < 0 || (ctrl & 0x10))
165		return -ENODEV;
166
167	conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
168	if (conf < 0 || (conf & 0x0c))
169		return -ENODEV;
170
171	id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
172	if (id < 0 || id != (LM73_ID & 0xff))
173		return -ENODEV;
174
175	/* Check device ID */
176	id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
177	if (id < 0 || id != LM73_ID)
178		return -ENODEV;
179
180	strlcpy(info->type, "lm73", I2C_NAME_SIZE);
181
182	return 0;
183}
184
185static struct i2c_driver lm73_driver = {
186	.class		= I2C_CLASS_HWMON,
187	.driver = {
188		.name	= "lm73",
189	},
190	.probe		= lm73_probe,
191	.remove		= lm73_remove,
192	.id_table	= lm73_ids,
193	.detect		= lm73_detect,
194	.address_list	= normal_i2c,
195};
196
197module_i2c_driver(lm73_driver);
198
199MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
200MODULE_DESCRIPTION("LM73 driver");
201MODULE_LICENSE("GPL");