lm95241.c (e5451c8f8330e03ad3cfa16048b4daf961af434f) lm95241.c (f48ccb26e264b112afc087d562fa2d68e2e1174b)
1/*
2 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
3 *
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
8 *

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54#define LM95241_REG_RW_REMOTE_MODEL 0x30
55
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
1/*
2 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
3 *
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
8 *

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54#define LM95241_REG_RW_REMOTE_MODEL 0x30
55
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 CFG_CRMASK 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))

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86 LM95241_REG_R_REMOTE2_TEMPH,
87 LM95241_REG_R_REMOTE2_TEMPL
88};
89
90/* Client data (each client gets its own) */
91struct lm95241_data {
92 struct i2c_client *client;
93 struct mutex update_lock;
63#define R1MS_SHIFT 0
64#define R2MS_SHIFT 2
65#define R1MS_MASK (0x01 << (R1MS_SHIFT))
66#define R2MS_MASK (0x01 << (R2MS_SHIFT))
67#define R1DF_SHIFT 1
68#define R2DF_SHIFT 2
69#define R1DF_MASK (0x01 << (R1DF_SHIFT))
70#define R2DF_MASK (0x01 << (R2DF_SHIFT))

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87 LM95241_REG_R_REMOTE2_TEMPH,
88 LM95241_REG_R_REMOTE2_TEMPL
89};
90
91/* Client data (each client gets its own) */
92struct lm95241_data {
93 struct i2c_client *client;
94 struct mutex update_lock;
94 unsigned long last_updated, interval; /* in jiffies */
95 unsigned long last_updated; /* in jiffies */
96 unsigned long interval; /* in milli-seconds */
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;
99};
100
101/* Conversions */
102static int temp_from_reg_signed(u8 val_h, u8 val_l)

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113
114static struct lm95241_data *lm95241_update_device(struct device *dev)
115{
116 struct lm95241_data *data = dev_get_drvdata(dev);
117 struct i2c_client *client = data->client;
118
119 mutex_lock(&data->update_lock);
120
97 char valid; /* zero until following fields are valid */
98 /* registers values */
99 u8 temp[ARRAY_SIZE(lm95241_reg_address)];
100 u8 config, model, trutherm;
101};
102
103/* Conversions */
104static int temp_from_reg_signed(u8 val_h, u8 val_l)

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115
116static struct lm95241_data *lm95241_update_device(struct device *dev)
117{
118 struct lm95241_data *data = dev_get_drvdata(dev);
119 struct i2c_client *client = data->client;
120
121 mutex_lock(&data->update_lock);
122
121 if (time_after(jiffies, data->last_updated + data->interval) ||
123 if (time_after(jiffies, data->last_updated
124 + msecs_to_jiffies(data->interval)) ||
122 !data->valid) {
123 int i;
124
125 dev_dbg(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]);

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271 return count;
272}
273
274static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
275 char *buf)
276{
277 struct lm95241_data *data = lm95241_update_device(dev);
278
125 !data->valid) {
126 int i;
127
128 dev_dbg(dev, "Updating lm95241 data.\n");
129 for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
130 data->temp[i]
131 = i2c_smbus_read_byte_data(client,
132 lm95241_reg_address[i]);

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274 return count;
275}
276
277static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
278 char *buf)
279{
280 struct lm95241_data *data = lm95241_update_device(dev);
281
279 return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
280 / HZ);
282 return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
281}
282
283static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
284 const char *buf, size_t count)
285{
286 struct lm95241_data *data = dev_get_drvdata(dev);
287 unsigned long val;
283}
284
285static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t count)
287{
288 struct lm95241_data *data = dev_get_drvdata(dev);
289 unsigned long val;
290 int convrate;
291 u8 config;
288
289 if (kstrtoul(buf, 10, &val) < 0)
290 return -EINVAL;
291
292
293 if (kstrtoul(buf, 10, &val) < 0)
294 return -EINVAL;
295
292 data->interval = val * HZ / 1000;
296 mutex_lock(&data->update_lock);
293
297
298 config = data->config & ~CFG_CRMASK;
299
300 if (val < 130) {
301 convrate = 76;
302 config |= CFG_CR0076;
303 } else if (val < 590) {
304 convrate = 182;
305 config |= CFG_CR0182;
306 } else if (val < 1850) {
307 convrate = 1000;
308 config |= CFG_CR1000;
309 } else {
310 convrate = 2700;
311 config |= CFG_CR2700;
312 }
313
314 data->interval = convrate;
315 data->config = config;
316 i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
317 config);
318 mutex_unlock(&data->update_lock);
319
294 return count;
295}
296
297static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
298static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
299static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
300static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
301 R1MS_MASK);

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357 /* Fill the i2c board info */
358 strlcpy(info->type, name, I2C_NAME_SIZE);
359 return 0;
360}
361
362static void lm95241_init_client(struct i2c_client *client,
363 struct lm95241_data *data)
364{
320 return count;
321}
322
323static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
324static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
325static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
326static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
327 R1MS_MASK);

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383 /* Fill the i2c board info */
384 strlcpy(info->type, name, I2C_NAME_SIZE);
385 return 0;
386}
387
388static void lm95241_init_client(struct i2c_client *client,
389 struct lm95241_data *data)
390{
365 data->interval = HZ; /* 1 sec default */
366 data->config = CFG_CR0076;
391 data->interval = 1000;
392 data->config = CFG_CR1000;
367 data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
368
369 i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
370 i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
371 R1FE_MASK | R2FE_MASK);
372 i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
373 data->trutherm);
374 i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,

--- 50 unchanged lines hidden --- 		393 data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
394
395 i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
396 i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
397 R1FE_MASK | R2FE_MASK);
398 i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
399 data->trutherm);
400 i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,

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