Loading...
1/*
2 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
5 * Jean Delvare <khali@linux-fr.org>
6 *
7 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
8 * It reports up to two temperatures (its own plus up to
9 * one external one). Complete datasheet can be
10 * obtained from Maxim's website at:
11 * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/slab.h>
32#include <linux/jiffies.h>
33#include <linux/i2c.h>
34#include <linux/hwmon.h>
35#include <linux/hwmon-sysfs.h>
36#include <linux/err.h>
37#include <linux/mutex.h>
38#include <linux/sysfs.h>
39
40static const unsigned short normal_i2c[] = {
41 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
42
43/*
44 * The MAX1619 registers
45 */
46
47#define MAX1619_REG_R_MAN_ID 0xFE
48#define MAX1619_REG_R_CHIP_ID 0xFF
49#define MAX1619_REG_R_CONFIG 0x03
50#define MAX1619_REG_W_CONFIG 0x09
51#define MAX1619_REG_R_CONVRATE 0x04
52#define MAX1619_REG_W_CONVRATE 0x0A
53#define MAX1619_REG_R_STATUS 0x02
54#define MAX1619_REG_R_LOCAL_TEMP 0x00
55#define MAX1619_REG_R_REMOTE_TEMP 0x01
56#define MAX1619_REG_R_REMOTE_HIGH 0x07
57#define MAX1619_REG_W_REMOTE_HIGH 0x0D
58#define MAX1619_REG_R_REMOTE_LOW 0x08
59#define MAX1619_REG_W_REMOTE_LOW 0x0E
60#define MAX1619_REG_R_REMOTE_CRIT 0x10
61#define MAX1619_REG_W_REMOTE_CRIT 0x12
62#define MAX1619_REG_R_TCRIT_HYST 0x11
63#define MAX1619_REG_W_TCRIT_HYST 0x13
64
65/*
66 * Conversions
67 */
68
69static int temp_from_reg(int val)
70{
71 return (val & 0x80 ? val-0x100 : val) * 1000;
72}
73
74static int temp_to_reg(int val)
75{
76 return (val < 0 ? val+0x100*1000 : val) / 1000;
77}
78
79/*
80 * Functions declaration
81 */
82
83static int max1619_probe(struct i2c_client *client,
84 const struct i2c_device_id *id);
85static int max1619_detect(struct i2c_client *client,
86 struct i2c_board_info *info);
87static void max1619_init_client(struct i2c_client *client);
88static int max1619_remove(struct i2c_client *client);
89static struct max1619_data *max1619_update_device(struct device *dev);
90
91/*
92 * Driver data (common to all clients)
93 */
94
95static const struct i2c_device_id max1619_id[] = {
96 { "max1619", 0 },
97 { }
98};
99MODULE_DEVICE_TABLE(i2c, max1619_id);
100
101static struct i2c_driver max1619_driver = {
102 .class = I2C_CLASS_HWMON,
103 .driver = {
104 .name = "max1619",
105 },
106 .probe = max1619_probe,
107 .remove = max1619_remove,
108 .id_table = max1619_id,
109 .detect = max1619_detect,
110 .address_list = normal_i2c,
111};
112
113/*
114 * Client data (each client gets its own)
115 */
116
117struct max1619_data {
118 struct device *hwmon_dev;
119 struct mutex update_lock;
120 char valid; /* zero until following fields are valid */
121 unsigned long last_updated; /* in jiffies */
122
123 /* registers values */
124 u8 temp_input1; /* local */
125 u8 temp_input2, temp_low2, temp_high2; /* remote */
126 u8 temp_crit2;
127 u8 temp_hyst2;
128 u8 alarms;
129};
130
131/*
132 * Sysfs stuff
133 */
134
135#define show_temp(value) \
136static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
137{ \
138 struct max1619_data *data = max1619_update_device(dev); \
139 return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
140}
141show_temp(temp_input1);
142show_temp(temp_input2);
143show_temp(temp_low2);
144show_temp(temp_high2);
145show_temp(temp_crit2);
146show_temp(temp_hyst2);
147
148#define set_temp2(value, reg) \
149static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
150 size_t count) \
151{ \
152 struct i2c_client *client = to_i2c_client(dev); \
153 struct max1619_data *data = i2c_get_clientdata(client); \
154 long val = simple_strtol(buf, NULL, 10); \
155 \
156 mutex_lock(&data->update_lock); \
157 data->value = temp_to_reg(val); \
158 i2c_smbus_write_byte_data(client, reg, data->value); \
159 mutex_unlock(&data->update_lock); \
160 return count; \
161}
162
163set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
164set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
165set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
166set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
167
168static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
169{
170 struct max1619_data *data = max1619_update_device(dev);
171 return sprintf(buf, "%d\n", data->alarms);
172}
173
174static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
175 char *buf)
176{
177 int bitnr = to_sensor_dev_attr(attr)->index;
178 struct max1619_data *data = max1619_update_device(dev);
179 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
180}
181
182static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
183static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
184static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
185 set_temp_low2);
186static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
187 set_temp_high2);
188static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
189 set_temp_crit2);
190static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
191 set_temp_hyst2);
192static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
193static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
194static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
195static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
196static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
197
198static struct attribute *max1619_attributes[] = {
199 &dev_attr_temp1_input.attr,
200 &dev_attr_temp2_input.attr,
201 &dev_attr_temp2_min.attr,
202 &dev_attr_temp2_max.attr,
203 &dev_attr_temp2_crit.attr,
204 &dev_attr_temp2_crit_hyst.attr,
205
206 &dev_attr_alarms.attr,
207 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
208 &sensor_dev_attr_temp2_fault.dev_attr.attr,
209 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
210 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
211 NULL
212};
213
214static const struct attribute_group max1619_group = {
215 .attrs = max1619_attributes,
216};
217
218/*
219 * Real code
220 */
221
222/* Return 0 if detection is successful, -ENODEV otherwise */
223static int max1619_detect(struct i2c_client *client,
224 struct i2c_board_info *info)
225{
226 struct i2c_adapter *adapter = client->adapter;
227 u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
228
229 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
230 return -ENODEV;
231
232 /* detection */
233 reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
234 reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
235 reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
236 if ((reg_config & 0x03) != 0x00
237 || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
238 dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
239 client->addr);
240 return -ENODEV;
241 }
242
243 /* identification */
244 man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
245 chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
246 if (man_id != 0x4D || chip_id != 0x04) {
247 dev_info(&adapter->dev,
248 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
249 man_id, chip_id);
250 return -ENODEV;
251 }
252
253 strlcpy(info->type, "max1619", I2C_NAME_SIZE);
254
255 return 0;
256}
257
258static int max1619_probe(struct i2c_client *new_client,
259 const struct i2c_device_id *id)
260{
261 struct max1619_data *data;
262 int err;
263
264 data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
265 if (!data) {
266 err = -ENOMEM;
267 goto exit;
268 }
269
270 i2c_set_clientdata(new_client, data);
271 data->valid = 0;
272 mutex_init(&data->update_lock);
273
274 /* Initialize the MAX1619 chip */
275 max1619_init_client(new_client);
276
277 /* Register sysfs hooks */
278 if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
279 goto exit_free;
280
281 data->hwmon_dev = hwmon_device_register(&new_client->dev);
282 if (IS_ERR(data->hwmon_dev)) {
283 err = PTR_ERR(data->hwmon_dev);
284 goto exit_remove_files;
285 }
286
287 return 0;
288
289exit_remove_files:
290 sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
291exit_free:
292 kfree(data);
293exit:
294 return err;
295}
296
297static void max1619_init_client(struct i2c_client *client)
298{
299 u8 config;
300
301 /*
302 * Start the conversions.
303 */
304 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
305 5); /* 2 Hz */
306 config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
307 if (config & 0x40)
308 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
309 config & 0xBF); /* run */
310}
311
312static int max1619_remove(struct i2c_client *client)
313{
314 struct max1619_data *data = i2c_get_clientdata(client);
315
316 hwmon_device_unregister(data->hwmon_dev);
317 sysfs_remove_group(&client->dev.kobj, &max1619_group);
318
319 kfree(data);
320 return 0;
321}
322
323static struct max1619_data *max1619_update_device(struct device *dev)
324{
325 struct i2c_client *client = to_i2c_client(dev);
326 struct max1619_data *data = i2c_get_clientdata(client);
327
328 mutex_lock(&data->update_lock);
329
330 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
331 dev_dbg(&client->dev, "Updating max1619 data.\n");
332 data->temp_input1 = i2c_smbus_read_byte_data(client,
333 MAX1619_REG_R_LOCAL_TEMP);
334 data->temp_input2 = i2c_smbus_read_byte_data(client,
335 MAX1619_REG_R_REMOTE_TEMP);
336 data->temp_high2 = i2c_smbus_read_byte_data(client,
337 MAX1619_REG_R_REMOTE_HIGH);
338 data->temp_low2 = i2c_smbus_read_byte_data(client,
339 MAX1619_REG_R_REMOTE_LOW);
340 data->temp_crit2 = i2c_smbus_read_byte_data(client,
341 MAX1619_REG_R_REMOTE_CRIT);
342 data->temp_hyst2 = i2c_smbus_read_byte_data(client,
343 MAX1619_REG_R_TCRIT_HYST);
344 data->alarms = i2c_smbus_read_byte_data(client,
345 MAX1619_REG_R_STATUS);
346
347 data->last_updated = jiffies;
348 data->valid = 1;
349 }
350
351 mutex_unlock(&data->update_lock);
352
353 return data;
354}
355
356static int __init sensors_max1619_init(void)
357{
358 return i2c_add_driver(&max1619_driver);
359}
360
361static void __exit sensors_max1619_exit(void)
362{
363 i2c_del_driver(&max1619_driver);
364}
365
366MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
367 "Jean Delvare <khali@linux-fr.org>");
368MODULE_DESCRIPTION("MAX1619 sensor driver");
369MODULE_LICENSE("GPL");
370
371module_init(sensors_max1619_init);
372module_exit(sensors_max1619_exit);
1/*
2 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
5 * Jean Delvare <jdelvare@suse.de>
6 *
7 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
8 * It reports up to two temperatures (its own plus up to
9 * one external one). Complete datasheet can be
10 * obtained from Maxim's website at:
11 * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 */
23
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/jiffies.h>
28#include <linux/i2c.h>
29#include <linux/hwmon.h>
30#include <linux/hwmon-sysfs.h>
31#include <linux/err.h>
32#include <linux/mutex.h>
33#include <linux/sysfs.h>
34
35static const unsigned short normal_i2c[] = {
36 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
37
38/*
39 * The MAX1619 registers
40 */
41
42#define MAX1619_REG_R_MAN_ID 0xFE
43#define MAX1619_REG_R_CHIP_ID 0xFF
44#define MAX1619_REG_R_CONFIG 0x03
45#define MAX1619_REG_W_CONFIG 0x09
46#define MAX1619_REG_R_CONVRATE 0x04
47#define MAX1619_REG_W_CONVRATE 0x0A
48#define MAX1619_REG_R_STATUS 0x02
49#define MAX1619_REG_R_LOCAL_TEMP 0x00
50#define MAX1619_REG_R_REMOTE_TEMP 0x01
51#define MAX1619_REG_R_REMOTE_HIGH 0x07
52#define MAX1619_REG_W_REMOTE_HIGH 0x0D
53#define MAX1619_REG_R_REMOTE_LOW 0x08
54#define MAX1619_REG_W_REMOTE_LOW 0x0E
55#define MAX1619_REG_R_REMOTE_CRIT 0x10
56#define MAX1619_REG_W_REMOTE_CRIT 0x12
57#define MAX1619_REG_R_TCRIT_HYST 0x11
58#define MAX1619_REG_W_TCRIT_HYST 0x13
59
60/*
61 * Conversions
62 */
63
64static int temp_from_reg(int val)
65{
66 return (val & 0x80 ? val-0x100 : val) * 1000;
67}
68
69static int temp_to_reg(int val)
70{
71 return (val < 0 ? val+0x100*1000 : val) / 1000;
72}
73
74enum temp_index {
75 t_input1 = 0,
76 t_input2,
77 t_low2,
78 t_high2,
79 t_crit2,
80 t_hyst2,
81 t_num_regs
82};
83
84/*
85 * Client data (each client gets its own)
86 */
87
88struct max1619_data {
89 struct i2c_client *client;
90 struct mutex update_lock;
91 char valid; /* zero until following fields are valid */
92 unsigned long last_updated; /* in jiffies */
93
94 /* registers values */
95 u8 temp[t_num_regs]; /* index with enum temp_index */
96 u8 alarms;
97};
98
99static const u8 regs_read[t_num_regs] = {
100 [t_input1] = MAX1619_REG_R_LOCAL_TEMP,
101 [t_input2] = MAX1619_REG_R_REMOTE_TEMP,
102 [t_low2] = MAX1619_REG_R_REMOTE_LOW,
103 [t_high2] = MAX1619_REG_R_REMOTE_HIGH,
104 [t_crit2] = MAX1619_REG_R_REMOTE_CRIT,
105 [t_hyst2] = MAX1619_REG_R_TCRIT_HYST,
106};
107
108static const u8 regs_write[t_num_regs] = {
109 [t_low2] = MAX1619_REG_W_REMOTE_LOW,
110 [t_high2] = MAX1619_REG_W_REMOTE_HIGH,
111 [t_crit2] = MAX1619_REG_W_REMOTE_CRIT,
112 [t_hyst2] = MAX1619_REG_W_TCRIT_HYST,
113};
114
115static struct max1619_data *max1619_update_device(struct device *dev)
116{
117 struct max1619_data *data = dev_get_drvdata(dev);
118 struct i2c_client *client = data->client;
119 int config, i;
120
121 mutex_lock(&data->update_lock);
122
123 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
124 dev_dbg(&client->dev, "Updating max1619 data.\n");
125 for (i = 0; i < t_num_regs; i++)
126 data->temp[i] = i2c_smbus_read_byte_data(client,
127 regs_read[i]);
128 data->alarms = i2c_smbus_read_byte_data(client,
129 MAX1619_REG_R_STATUS);
130 /* If OVERT polarity is low, reverse alarm bit */
131 config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
132 if (!(config & 0x20))
133 data->alarms ^= 0x02;
134
135 data->last_updated = jiffies;
136 data->valid = 1;
137 }
138
139 mutex_unlock(&data->update_lock);
140
141 return data;
142}
143
144/*
145 * Sysfs stuff
146 */
147
148static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
149 char *buf)
150{
151 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
152 struct max1619_data *data = max1619_update_device(dev);
153
154 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
155}
156
157static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
158 const char *buf, size_t count)
159{
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
161 struct max1619_data *data = dev_get_drvdata(dev);
162 struct i2c_client *client = data->client;
163 long val;
164 int err = kstrtol(buf, 10, &val);
165 if (err)
166 return err;
167
168 mutex_lock(&data->update_lock);
169 data->temp[attr->index] = temp_to_reg(val);
170 i2c_smbus_write_byte_data(client, regs_write[attr->index],
171 data->temp[attr->index]);
172 mutex_unlock(&data->update_lock);
173 return count;
174}
175
176static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
177 char *buf)
178{
179 struct max1619_data *data = max1619_update_device(dev);
180 return sprintf(buf, "%d\n", data->alarms);
181}
182
183static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
184 char *buf)
185{
186 int bitnr = to_sensor_dev_attr(attr)->index;
187 struct max1619_data *data = max1619_update_device(dev);
188 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
189}
190
191static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, t_input1);
192static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, t_input2);
193static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp, set_temp,
194 t_low2);
195static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp, set_temp,
196 t_high2);
197static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp, set_temp,
198 t_crit2);
199static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp,
200 set_temp, t_hyst2);
201
202static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
203static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
204static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
205static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
206static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
207
208static struct attribute *max1619_attrs[] = {
209 &sensor_dev_attr_temp1_input.dev_attr.attr,
210 &sensor_dev_attr_temp2_input.dev_attr.attr,
211 &sensor_dev_attr_temp2_min.dev_attr.attr,
212 &sensor_dev_attr_temp2_max.dev_attr.attr,
213 &sensor_dev_attr_temp2_crit.dev_attr.attr,
214 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
215
216 &dev_attr_alarms.attr,
217 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
218 &sensor_dev_attr_temp2_fault.dev_attr.attr,
219 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
220 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
221 NULL
222};
223ATTRIBUTE_GROUPS(max1619);
224
225/* Return 0 if detection is successful, -ENODEV otherwise */
226static int max1619_detect(struct i2c_client *client,
227 struct i2c_board_info *info)
228{
229 struct i2c_adapter *adapter = client->adapter;
230 u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
231
232 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
233 return -ENODEV;
234
235 /* detection */
236 reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
237 reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
238 reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
239 if ((reg_config & 0x03) != 0x00
240 || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
241 dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
242 client->addr);
243 return -ENODEV;
244 }
245
246 /* identification */
247 man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
248 chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
249 if (man_id != 0x4D || chip_id != 0x04) {
250 dev_info(&adapter->dev,
251 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
252 man_id, chip_id);
253 return -ENODEV;
254 }
255
256 strlcpy(info->type, "max1619", I2C_NAME_SIZE);
257
258 return 0;
259}
260
261static void max1619_init_client(struct i2c_client *client)
262{
263 u8 config;
264
265 /*
266 * Start the conversions.
267 */
268 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
269 5); /* 2 Hz */
270 config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
271 if (config & 0x40)
272 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
273 config & 0xBF); /* run */
274}
275
276static int max1619_probe(struct i2c_client *new_client,
277 const struct i2c_device_id *id)
278{
279 struct max1619_data *data;
280 struct device *hwmon_dev;
281
282 data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
283 GFP_KERNEL);
284 if (!data)
285 return -ENOMEM;
286
287 data->client = new_client;
288 mutex_init(&data->update_lock);
289
290 /* Initialize the MAX1619 chip */
291 max1619_init_client(new_client);
292
293 hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
294 new_client->name,
295 data,
296 max1619_groups);
297 return PTR_ERR_OR_ZERO(hwmon_dev);
298}
299
300static const struct i2c_device_id max1619_id[] = {
301 { "max1619", 0 },
302 { }
303};
304MODULE_DEVICE_TABLE(i2c, max1619_id);
305
306static struct i2c_driver max1619_driver = {
307 .class = I2C_CLASS_HWMON,
308 .driver = {
309 .name = "max1619",
310 },
311 .probe = max1619_probe,
312 .id_table = max1619_id,
313 .detect = max1619_detect,
314 .address_list = normal_i2c,
315};
316
317module_i2c_driver(max1619_driver);
318
319MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
320MODULE_DESCRIPTION("MAX1619 sensor driver");
321MODULE_LICENSE("GPL");