serial: xilinx_uartps: fix bad register write in console_write
[linux-2.6-xlnx.git] / drivers / hwmon / lm95241.c
blobbd8cdb7b96ed586cf6cbae1c676ab445f6620bcf
1 /*
2 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
4 * The LM95241 is a sensor chip made by National Semiconductors.
5 * It reports up to three temperatures (its own plus up to two external ones).
6 * Complete datasheet can be obtained from National's website at:
7 * http://www.national.com/ds.cgi/LM/LM95241.pdf
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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>
35 #define DEVNAME "lm95241"
37 static const unsigned short normal_i2c[] = {
38 0x19, 0x2a, 0x2b, I2C_CLIENT_END };
40 /* LM95241 registers */
41 #define LM95241_REG_R_MAN_ID 0xFE
42 #define LM95241_REG_R_CHIP_ID 0xFF
43 #define LM95241_REG_R_STATUS 0x02
44 #define LM95241_REG_RW_CONFIG 0x03
45 #define LM95241_REG_RW_REM_FILTER 0x06
46 #define LM95241_REG_RW_TRUTHERM 0x07
47 #define LM95241_REG_W_ONE_SHOT 0x0F
48 #define LM95241_REG_R_LOCAL_TEMPH 0x10
49 #define LM95241_REG_R_REMOTE1_TEMPH 0x11
50 #define LM95241_REG_R_REMOTE2_TEMPH 0x12
51 #define LM95241_REG_R_LOCAL_TEMPL 0x20
52 #define LM95241_REG_R_REMOTE1_TEMPL 0x21
53 #define LM95241_REG_R_REMOTE2_TEMPL 0x22
54 #define LM95241_REG_RW_REMOTE_MODEL 0x30
56 /* LM95241 specific bitfields */
57 #define CFG_STOP 0x40
58 #define CFG_CR0076 0x00
59 #define CFG_CR0182 0x10
60 #define CFG_CR1000 0x20
61 #define CFG_CR2700 0x30
62 #define R1MS_SHIFT 0
63 #define R2MS_SHIFT 2
64 #define R1MS_MASK (0x01 << (R1MS_SHIFT))
65 #define R2MS_MASK (0x01 << (R2MS_SHIFT))
66 #define R1DF_SHIFT 1
67 #define R2DF_SHIFT 2
68 #define R1DF_MASK (0x01 << (R1DF_SHIFT))
69 #define R2DF_MASK (0x01 << (R2DF_SHIFT))
70 #define R1FE_MASK 0x01
71 #define R2FE_MASK 0x05
72 #define TT1_SHIFT 0
73 #define TT2_SHIFT 4
74 #define TT_OFF 0
75 #define TT_ON 1
76 #define TT_MASK 7
77 #define NATSEMI_MAN_ID 0x01
78 #define LM95231_CHIP_ID 0xA1
79 #define LM95241_CHIP_ID 0xA4
81 static const u8 lm95241_reg_address[] = {
82 LM95241_REG_R_LOCAL_TEMPH,
83 LM95241_REG_R_LOCAL_TEMPL,
84 LM95241_REG_R_REMOTE1_TEMPH,
85 LM95241_REG_R_REMOTE1_TEMPL,
86 LM95241_REG_R_REMOTE2_TEMPH,
87 LM95241_REG_R_REMOTE2_TEMPL
90 /* Client data (each client gets its own) */
91 struct lm95241_data {
92 struct device *hwmon_dev;
93 struct mutex update_lock;
94 unsigned long last_updated, interval; /* in jiffies */
95 char valid; /* zero until following fields are valid */
96 /* registers values */
97 u8 temp[ARRAY_SIZE(lm95241_reg_address)];
98 u8 config, model, trutherm;
101 /* Conversions */
102 static int temp_from_reg_signed(u8 val_h, u8 val_l)
104 s16 val_hl = (val_h << 8) | val_l;
105 return val_hl * 1000 / 256;
108 static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
110 u16 val_hl = (val_h << 8) | val_l;
111 return val_hl * 1000 / 256;
114 static struct lm95241_data *lm95241_update_device(struct device *dev)
116 struct i2c_client *client = to_i2c_client(dev);
117 struct lm95241_data *data = i2c_get_clientdata(client);
119 mutex_lock(&data->update_lock);
121 if (time_after(jiffies, data->last_updated + data->interval) ||
122 !data->valid) {
123 int i;
125 dev_dbg(&client->dev, "Updating lm95241 data.\n");
126 for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
127 data->temp[i]
128 = i2c_smbus_read_byte_data(client,
129 lm95241_reg_address[i]);
130 data->last_updated = jiffies;
131 data->valid = 1;
134 mutex_unlock(&data->update_lock);
136 return data;
139 /* Sysfs stuff */
140 static ssize_t show_input(struct device *dev, struct device_attribute *attr,
141 char *buf)
143 struct lm95241_data *data = lm95241_update_device(dev);
144 int index = to_sensor_dev_attr(attr)->index;
146 return snprintf(buf, PAGE_SIZE - 1, "%d\n",
147 index == 0 || (data->config & (1 << (index / 2))) ?
148 temp_from_reg_signed(data->temp[index], data->temp[index + 1]) :
149 temp_from_reg_unsigned(data->temp[index],
150 data->temp[index + 1]));
153 static ssize_t show_type(struct device *dev, struct device_attribute *attr,
154 char *buf)
156 struct i2c_client *client = to_i2c_client(dev);
157 struct lm95241_data *data = i2c_get_clientdata(client);
159 return snprintf(buf, PAGE_SIZE - 1,
160 data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
163 static ssize_t set_type(struct device *dev, struct device_attribute *attr,
164 const char *buf, size_t count)
166 struct i2c_client *client = to_i2c_client(dev);
167 struct lm95241_data *data = i2c_get_clientdata(client);
168 unsigned long val;
169 int shift;
170 u8 mask = to_sensor_dev_attr(attr)->index;
172 if (kstrtoul(buf, 10, &val) < 0)
173 return -EINVAL;
174 if (val != 1 && val != 2)
175 return -EINVAL;
177 shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT;
179 mutex_lock(&data->update_lock);
181 data->trutherm &= ~(TT_MASK << shift);
182 if (val == 1) {
183 data->model |= mask;
184 data->trutherm |= (TT_ON << shift);
185 } else {
186 data->model &= ~mask;
187 data->trutherm |= (TT_OFF << shift);
189 data->valid = 0;
191 i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
192 data->model);
193 i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
194 data->trutherm);
196 mutex_unlock(&data->update_lock);
198 return count;
201 static ssize_t show_min(struct device *dev, struct device_attribute *attr,
202 char *buf)
204 struct i2c_client *client = to_i2c_client(dev);
205 struct lm95241_data *data = i2c_get_clientdata(client);
207 return snprintf(buf, PAGE_SIZE - 1,
208 data->config & to_sensor_dev_attr(attr)->index ?
209 "-127000\n" : "0\n");
212 static ssize_t set_min(struct device *dev, struct device_attribute *attr,
213 const char *buf, size_t count)
215 struct i2c_client *client = to_i2c_client(dev);
216 struct lm95241_data *data = i2c_get_clientdata(client);
217 long val;
219 if (kstrtol(buf, 10, &val) < 0)
220 return -EINVAL;
221 if (val < -128000)
222 return -EINVAL;
224 mutex_lock(&data->update_lock);
226 if (val < 0)
227 data->config |= to_sensor_dev_attr(attr)->index;
228 else
229 data->config &= ~to_sensor_dev_attr(attr)->index;
230 data->valid = 0;
232 i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
234 mutex_unlock(&data->update_lock);
236 return count;
239 static ssize_t show_max(struct device *dev, struct device_attribute *attr,
240 char *buf)
242 struct i2c_client *client = to_i2c_client(dev);
243 struct lm95241_data *data = i2c_get_clientdata(client);
245 return snprintf(buf, PAGE_SIZE - 1,
246 data->config & to_sensor_dev_attr(attr)->index ?
247 "127000\n" : "255000\n");
250 static ssize_t set_max(struct device *dev, struct device_attribute *attr,
251 const char *buf, size_t count)
253 struct i2c_client *client = to_i2c_client(dev);
254 struct lm95241_data *data = i2c_get_clientdata(client);
255 long val;
257 if (kstrtol(buf, 10, &val) < 0)
258 return -EINVAL;
259 if (val >= 256000)
260 return -EINVAL;
262 mutex_lock(&data->update_lock);
264 if (val <= 127000)
265 data->config |= to_sensor_dev_attr(attr)->index;
266 else
267 data->config &= ~to_sensor_dev_attr(attr)->index;
268 data->valid = 0;
270 i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
272 mutex_unlock(&data->update_lock);
274 return count;
277 static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
278 char *buf)
280 struct lm95241_data *data = lm95241_update_device(dev);
282 return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
283 / HZ);
286 static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
287 const char *buf, size_t count)
289 struct i2c_client *client = to_i2c_client(dev);
290 struct lm95241_data *data = i2c_get_clientdata(client);
291 unsigned long val;
293 if (kstrtoul(buf, 10, &val) < 0)
294 return -EINVAL;
296 data->interval = val * HZ / 1000;
298 return count;
301 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
302 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
303 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
304 static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
305 R1MS_MASK);
306 static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
307 R2MS_MASK);
308 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min,
309 R1DF_MASK);
310 static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min,
311 R2DF_MASK);
312 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max,
313 R1DF_MASK);
314 static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max,
315 R2DF_MASK);
316 static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
317 set_interval);
319 static struct attribute *lm95241_attributes[] = {
320 &sensor_dev_attr_temp1_input.dev_attr.attr,
321 &sensor_dev_attr_temp2_input.dev_attr.attr,
322 &sensor_dev_attr_temp3_input.dev_attr.attr,
323 &sensor_dev_attr_temp2_type.dev_attr.attr,
324 &sensor_dev_attr_temp3_type.dev_attr.attr,
325 &sensor_dev_attr_temp2_min.dev_attr.attr,
326 &sensor_dev_attr_temp3_min.dev_attr.attr,
327 &sensor_dev_attr_temp2_max.dev_attr.attr,
328 &sensor_dev_attr_temp3_max.dev_attr.attr,
329 &dev_attr_update_interval.attr,
330 NULL
333 static const struct attribute_group lm95241_group = {
334 .attrs = lm95241_attributes,
337 /* Return 0 if detection is successful, -ENODEV otherwise */
338 static int lm95241_detect(struct i2c_client *new_client,
339 struct i2c_board_info *info)
341 struct i2c_adapter *adapter = new_client->adapter;
342 const char *name;
343 int mfg_id, chip_id;
345 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
346 return -ENODEV;
348 mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
349 if (mfg_id != NATSEMI_MAN_ID)
350 return -ENODEV;
352 chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
353 switch (chip_id) {
354 case LM95231_CHIP_ID:
355 name = "lm95231";
356 break;
357 case LM95241_CHIP_ID:
358 name = "lm95241";
359 break;
360 default:
361 return -ENODEV;
364 /* Fill the i2c board info */
365 strlcpy(info->type, name, I2C_NAME_SIZE);
366 return 0;
369 static void lm95241_init_client(struct i2c_client *client)
371 struct lm95241_data *data = i2c_get_clientdata(client);
373 data->interval = HZ; /* 1 sec default */
374 data->valid = 0;
375 data->config = CFG_CR0076;
376 data->model = 0;
377 data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
379 i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
380 i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
381 R1FE_MASK | R2FE_MASK);
382 i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
383 data->trutherm);
384 i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
385 data->model);
388 static int lm95241_probe(struct i2c_client *new_client,
389 const struct i2c_device_id *id)
391 struct lm95241_data *data;
392 int err;
394 data = kzalloc(sizeof(struct lm95241_data), GFP_KERNEL);
395 if (!data) {
396 err = -ENOMEM;
397 goto exit;
400 i2c_set_clientdata(new_client, data);
401 mutex_init(&data->update_lock);
403 /* Initialize the LM95241 chip */
404 lm95241_init_client(new_client);
406 /* Register sysfs hooks */
407 err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group);
408 if (err)
409 goto exit_free;
411 data->hwmon_dev = hwmon_device_register(&new_client->dev);
412 if (IS_ERR(data->hwmon_dev)) {
413 err = PTR_ERR(data->hwmon_dev);
414 goto exit_remove_files;
417 return 0;
419 exit_remove_files:
420 sysfs_remove_group(&new_client->dev.kobj, &lm95241_group);
421 exit_free:
422 kfree(data);
423 exit:
424 return err;
427 static int lm95241_remove(struct i2c_client *client)
429 struct lm95241_data *data = i2c_get_clientdata(client);
431 hwmon_device_unregister(data->hwmon_dev);
432 sysfs_remove_group(&client->dev.kobj, &lm95241_group);
434 kfree(data);
435 return 0;
438 /* Driver data (common to all clients) */
439 static const struct i2c_device_id lm95241_id[] = {
440 { "lm95231", 0 },
441 { "lm95241", 0 },
444 MODULE_DEVICE_TABLE(i2c, lm95241_id);
446 static struct i2c_driver lm95241_driver = {
447 .class = I2C_CLASS_HWMON,
448 .driver = {
449 .name = DEVNAME,
451 .probe = lm95241_probe,
452 .remove = lm95241_remove,
453 .id_table = lm95241_id,
454 .detect = lm95241_detect,
455 .address_list = normal_i2c,
458 module_i2c_driver(lm95241_driver);
460 MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
461 MODULE_DESCRIPTION("LM95241 sensor driver");
462 MODULE_LICENSE("GPL");