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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
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
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
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
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
115
116
117struct max1619_data {
118 struct device *hwmon_dev;
119 struct mutex update_lock;
120 char valid;
121 unsigned long last_updated;
122
123
124 u8 temp_input1;
125 u8 temp_input2, temp_low2, temp_high2;
126 u8 temp_crit2;
127 u8 temp_hyst2;
128 u8 alarms;
129};
130
131
132
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
220
221
222
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
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
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
275 max1619_init_client(new_client);
276
277
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
303
304 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
305 5);
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);
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);
373
