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4453d736 GR |
1 | /* |
2 | * jc42.c - driver for Jedec JC42.4 compliant temperature sensors | |
3 | * | |
4 | * Copyright (c) 2010 Ericsson AB. | |
5 | * | |
6 | * Derived from lm77.c by Andras BALI <drewie@freemail.hu>. | |
7 | * | |
8 | * JC42.4 compliant temperature sensors are typically used on memory modules. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/jiffies.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/hwmon.h> | |
31 | #include <linux/hwmon-sysfs.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/mutex.h> | |
34 | ||
35 | /* Addresses to scan */ | |
36 | static const unsigned short normal_i2c[] = { | |
37 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, I2C_CLIENT_END }; | |
38 | ||
39 | /* JC42 registers. All registers are 16 bit. */ | |
40 | #define JC42_REG_CAP 0x00 | |
41 | #define JC42_REG_CONFIG 0x01 | |
42 | #define JC42_REG_TEMP_UPPER 0x02 | |
43 | #define JC42_REG_TEMP_LOWER 0x03 | |
44 | #define JC42_REG_TEMP_CRITICAL 0x04 | |
45 | #define JC42_REG_TEMP 0x05 | |
46 | #define JC42_REG_MANID 0x06 | |
47 | #define JC42_REG_DEVICEID 0x07 | |
48 | ||
49 | /* Status bits in temperature register */ | |
50 | #define JC42_ALARM_CRIT_BIT 15 | |
51 | #define JC42_ALARM_MAX_BIT 14 | |
52 | #define JC42_ALARM_MIN_BIT 13 | |
53 | ||
54 | /* Configuration register defines */ | |
55 | #define JC42_CFG_CRIT_ONLY (1 << 2) | |
56 | #define JC42_CFG_SHUTDOWN (1 << 8) | |
57 | #define JC42_CFG_HYST_SHIFT 9 | |
58 | #define JC42_CFG_HYST_MASK 0x03 | |
59 | ||
60 | /* Capabilities */ | |
61 | #define JC42_CAP_RANGE (1 << 2) | |
62 | ||
63 | /* Manufacturer IDs */ | |
64 | #define ADT_MANID 0x11d4 /* Analog Devices */ | |
65 | #define MAX_MANID 0x004d /* Maxim */ | |
66 | #define IDT_MANID 0x00b3 /* IDT */ | |
67 | #define MCP_MANID 0x0054 /* Microchip */ | |
68 | #define NXP_MANID 0x1131 /* NXP Semiconductors */ | |
69 | #define ONS_MANID 0x1b09 /* ON Semiconductor */ | |
70 | #define STM_MANID 0x104a /* ST Microelectronics */ | |
71 | ||
72 | /* Supported chips */ | |
73 | ||
74 | /* Analog Devices */ | |
75 | #define ADT7408_DEVID 0x0801 | |
76 | #define ADT7408_DEVID_MASK 0xffff | |
77 | ||
78 | /* IDT */ | |
79 | #define TS3000B3_DEVID 0x2903 /* Also matches TSE2002B3 */ | |
80 | #define TS3000B3_DEVID_MASK 0xffff | |
81 | ||
82 | /* Maxim */ | |
83 | #define MAX6604_DEVID 0x3e00 | |
84 | #define MAX6604_DEVID_MASK 0xffff | |
85 | ||
86 | /* Microchip */ | |
87 | #define MCP98242_DEVID 0x2000 | |
88 | #define MCP98242_DEVID_MASK 0xfffc | |
89 | ||
90 | #define MCP98243_DEVID 0x2100 | |
91 | #define MCP98243_DEVID_MASK 0xfffc | |
92 | ||
93 | #define MCP9843_DEVID 0x0000 /* Also matches mcp9805 */ | |
94 | #define MCP9843_DEVID_MASK 0xfffe | |
95 | ||
96 | /* NXP */ | |
97 | #define SE97_DEVID 0xa200 | |
98 | #define SE97_DEVID_MASK 0xfffc | |
99 | ||
100 | #define SE98_DEVID 0xa100 | |
101 | #define SE98_DEVID_MASK 0xfffc | |
102 | ||
103 | /* ON Semiconductor */ | |
104 | #define CAT6095_DEVID 0x0800 /* Also matches CAT34TS02 */ | |
105 | #define CAT6095_DEVID_MASK 0xffe0 | |
106 | ||
107 | /* ST Microelectronics */ | |
108 | #define STTS424_DEVID 0x0101 | |
109 | #define STTS424_DEVID_MASK 0xffff | |
110 | ||
111 | #define STTS424E_DEVID 0x0000 | |
112 | #define STTS424E_DEVID_MASK 0xfffe | |
113 | ||
114 | static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 }; | |
115 | ||
116 | struct jc42_chips { | |
117 | u16 manid; | |
118 | u16 devid; | |
119 | u16 devid_mask; | |
120 | }; | |
121 | ||
122 | static struct jc42_chips jc42_chips[] = { | |
123 | { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK }, | |
124 | { IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK }, | |
125 | { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK }, | |
126 | { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK }, | |
127 | { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK }, | |
128 | { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK }, | |
129 | { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK }, | |
130 | { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK }, | |
131 | { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK }, | |
132 | { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK }, | |
133 | { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK }, | |
134 | }; | |
135 | ||
136 | /* Each client has this additional data */ | |
137 | struct jc42_data { | |
138 | struct device *hwmon_dev; | |
139 | struct mutex update_lock; /* protect register access */ | |
140 | bool extended; /* true if extended range supported */ | |
141 | bool valid; | |
142 | unsigned long last_updated; /* In jiffies */ | |
143 | u16 orig_config; /* original configuration */ | |
144 | u16 config; /* current configuration */ | |
145 | u16 temp_input; /* Temperatures */ | |
146 | u16 temp_crit; | |
147 | u16 temp_min; | |
148 | u16 temp_max; | |
149 | }; | |
150 | ||
151 | static int jc42_probe(struct i2c_client *client, | |
152 | const struct i2c_device_id *id); | |
153 | static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info); | |
154 | static int jc42_remove(struct i2c_client *client); | |
155 | static int jc42_read_value(struct i2c_client *client, u8 reg); | |
156 | static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value); | |
157 | ||
158 | static struct jc42_data *jc42_update_device(struct device *dev); | |
159 | ||
160 | static const struct i2c_device_id jc42_id[] = { | |
161 | { "adt7408", 0 }, | |
162 | { "cat94ts02", 0 }, | |
163 | { "cat6095", 0 }, | |
164 | { "jc42", 0 }, | |
165 | { "max6604", 0 }, | |
166 | { "mcp9805", 0 }, | |
167 | { "mcp98242", 0 }, | |
168 | { "mcp98243", 0 }, | |
169 | { "mcp9843", 0 }, | |
170 | { "se97", 0 }, | |
171 | { "se97b", 0 }, | |
172 | { "se98", 0 }, | |
173 | { "stts424", 0 }, | |
174 | { "tse2002b3", 0 }, | |
175 | { "ts3000b3", 0 }, | |
176 | { } | |
177 | }; | |
178 | MODULE_DEVICE_TABLE(i2c, jc42_id); | |
179 | ||
180 | #ifdef CONFIG_PM | |
181 | ||
182 | static int jc42_suspend(struct device *dev) | |
183 | { | |
184 | struct i2c_client *client = to_i2c_client(dev); | |
185 | struct jc42_data *data = i2c_get_clientdata(client); | |
186 | ||
187 | data->config |= JC42_CFG_SHUTDOWN; | |
188 | jc42_write_value(client, JC42_REG_CONFIG, data->config); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static int jc42_resume(struct device *dev) | |
193 | { | |
194 | struct i2c_client *client = to_i2c_client(dev); | |
195 | struct jc42_data *data = i2c_get_clientdata(client); | |
196 | ||
197 | data->config &= ~JC42_CFG_SHUTDOWN; | |
198 | jc42_write_value(client, JC42_REG_CONFIG, data->config); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static const struct dev_pm_ops jc42_dev_pm_ops = { | |
203 | .suspend = jc42_suspend, | |
204 | .resume = jc42_resume, | |
205 | }; | |
206 | ||
207 | #define JC42_DEV_PM_OPS (&jc42_dev_pm_ops) | |
208 | #else | |
209 | #define JC42_DEV_PM_OPS NULL | |
210 | #endif /* CONFIG_PM */ | |
211 | ||
212 | /* This is the driver that will be inserted */ | |
213 | static struct i2c_driver jc42_driver = { | |
214 | .class = I2C_CLASS_HWMON, | |
215 | .driver = { | |
216 | .name = "jc42", | |
217 | .pm = JC42_DEV_PM_OPS, | |
218 | }, | |
219 | .probe = jc42_probe, | |
220 | .remove = jc42_remove, | |
221 | .id_table = jc42_id, | |
222 | .detect = jc42_detect, | |
223 | .address_list = normal_i2c, | |
224 | }; | |
225 | ||
226 | #define JC42_TEMP_MIN_EXTENDED (-40000) | |
227 | #define JC42_TEMP_MIN 0 | |
228 | #define JC42_TEMP_MAX 125000 | |
229 | ||
230 | static u16 jc42_temp_to_reg(int temp, bool extended) | |
231 | { | |
232 | int ntemp = SENSORS_LIMIT(temp, | |
233 | extended ? JC42_TEMP_MIN_EXTENDED : | |
234 | JC42_TEMP_MIN, JC42_TEMP_MAX); | |
235 | ||
236 | /* convert from 0.001 to 0.0625 resolution */ | |
237 | return (ntemp * 2 / 125) & 0x1fff; | |
238 | } | |
239 | ||
240 | static int jc42_temp_from_reg(s16 reg) | |
241 | { | |
242 | reg &= 0x1fff; | |
243 | ||
244 | /* sign extend register */ | |
245 | if (reg & 0x1000) | |
246 | reg |= 0xf000; | |
247 | ||
248 | /* convert from 0.0625 to 0.001 resolution */ | |
249 | return reg * 125 / 2; | |
250 | } | |
251 | ||
252 | /* sysfs stuff */ | |
253 | ||
254 | /* read routines for temperature limits */ | |
255 | #define show(value) \ | |
256 | static ssize_t show_##value(struct device *dev, \ | |
257 | struct device_attribute *attr, \ | |
258 | char *buf) \ | |
259 | { \ | |
260 | struct jc42_data *data = jc42_update_device(dev); \ | |
261 | if (IS_ERR(data)) \ | |
262 | return PTR_ERR(data); \ | |
263 | return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value)); \ | |
264 | } | |
265 | ||
266 | show(temp_input); | |
267 | show(temp_crit); | |
268 | show(temp_min); | |
269 | show(temp_max); | |
270 | ||
271 | /* read routines for hysteresis values */ | |
272 | static ssize_t show_temp_crit_hyst(struct device *dev, | |
273 | struct device_attribute *attr, char *buf) | |
274 | { | |
275 | struct jc42_data *data = jc42_update_device(dev); | |
276 | int temp, hyst; | |
277 | ||
278 | if (IS_ERR(data)) | |
279 | return PTR_ERR(data); | |
280 | ||
281 | temp = jc42_temp_from_reg(data->temp_crit); | |
282 | hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT) | |
283 | & JC42_CFG_HYST_MASK]; | |
284 | return sprintf(buf, "%d\n", temp - hyst); | |
285 | } | |
286 | ||
287 | static ssize_t show_temp_max_hyst(struct device *dev, | |
288 | struct device_attribute *attr, char *buf) | |
289 | { | |
290 | struct jc42_data *data = jc42_update_device(dev); | |
291 | int temp, hyst; | |
292 | ||
293 | if (IS_ERR(data)) | |
294 | return PTR_ERR(data); | |
295 | ||
296 | temp = jc42_temp_from_reg(data->temp_max); | |
297 | hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT) | |
298 | & JC42_CFG_HYST_MASK]; | |
299 | return sprintf(buf, "%d\n", temp - hyst); | |
300 | } | |
301 | ||
302 | /* write routines */ | |
303 | #define set(value, reg) \ | |
304 | static ssize_t set_##value(struct device *dev, \ | |
305 | struct device_attribute *attr, \ | |
306 | const char *buf, size_t count) \ | |
307 | { \ | |
308 | struct i2c_client *client = to_i2c_client(dev); \ | |
309 | struct jc42_data *data = i2c_get_clientdata(client); \ | |
310 | int err, ret = count; \ | |
311 | long val; \ | |
312 | if (strict_strtol(buf, 10, &val) < 0) \ | |
313 | return -EINVAL; \ | |
314 | mutex_lock(&data->update_lock); \ | |
315 | data->value = jc42_temp_to_reg(val, data->extended); \ | |
316 | err = jc42_write_value(client, reg, data->value); \ | |
317 | if (err < 0) \ | |
318 | ret = err; \ | |
319 | mutex_unlock(&data->update_lock); \ | |
320 | return ret; \ | |
321 | } | |
322 | ||
323 | set(temp_min, JC42_REG_TEMP_LOWER); | |
324 | set(temp_max, JC42_REG_TEMP_UPPER); | |
325 | set(temp_crit, JC42_REG_TEMP_CRITICAL); | |
326 | ||
327 | /* JC42.4 compliant chips only support four hysteresis values. | |
328 | * Pick best choice and go from there. */ | |
329 | static ssize_t set_temp_crit_hyst(struct device *dev, | |
330 | struct device_attribute *attr, | |
331 | const char *buf, size_t count) | |
332 | { | |
333 | struct i2c_client *client = to_i2c_client(dev); | |
334 | struct jc42_data *data = i2c_get_clientdata(client); | |
335 | long val; | |
336 | int diff, hyst; | |
337 | int err; | |
338 | int ret = count; | |
339 | ||
340 | if (strict_strtoul(buf, 10, &val) < 0) | |
341 | return -EINVAL; | |
342 | ||
343 | diff = jc42_temp_from_reg(data->temp_crit) - val; | |
344 | hyst = 0; | |
345 | if (diff > 0) { | |
346 | if (diff < 2250) | |
347 | hyst = 1; /* 1.5 degrees C */ | |
348 | else if (diff < 4500) | |
349 | hyst = 2; /* 3.0 degrees C */ | |
350 | else | |
351 | hyst = 3; /* 6.0 degrees C */ | |
352 | } | |
353 | ||
354 | mutex_lock(&data->update_lock); | |
355 | data->config = (data->config | |
356 | & ~(JC42_CFG_HYST_MASK << JC42_CFG_HYST_SHIFT)) | |
357 | | (hyst << JC42_CFG_HYST_SHIFT); | |
358 | err = jc42_write_value(client, JC42_REG_CONFIG, data->config); | |
359 | if (err < 0) | |
360 | ret = err; | |
361 | mutex_unlock(&data->update_lock); | |
362 | return ret; | |
363 | } | |
364 | ||
365 | static ssize_t show_alarm(struct device *dev, | |
366 | struct device_attribute *attr, char *buf) | |
367 | { | |
368 | u16 bit = to_sensor_dev_attr(attr)->index; | |
369 | struct jc42_data *data = jc42_update_device(dev); | |
370 | u16 val; | |
371 | ||
372 | if (IS_ERR(data)) | |
373 | return PTR_ERR(data); | |
374 | ||
375 | val = data->temp_input; | |
376 | if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY)) | |
377 | val = 0; | |
378 | return sprintf(buf, "%u\n", (val >> bit) & 1); | |
379 | } | |
380 | ||
381 | static DEVICE_ATTR(temp1_input, S_IRUGO, | |
382 | show_temp_input, NULL); | |
383 | static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, | |
384 | show_temp_crit, set_temp_crit); | |
385 | static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, | |
386 | show_temp_min, set_temp_min); | |
387 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
388 | show_temp_max, set_temp_max); | |
389 | ||
390 | static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, | |
391 | show_temp_crit_hyst, set_temp_crit_hyst); | |
392 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, | |
393 | show_temp_max_hyst, NULL); | |
394 | ||
395 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, | |
396 | JC42_ALARM_CRIT_BIT); | |
397 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, | |
398 | JC42_ALARM_MIN_BIT); | |
399 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, | |
400 | JC42_ALARM_MAX_BIT); | |
401 | ||
402 | static struct attribute *jc42_attributes[] = { | |
403 | &dev_attr_temp1_input.attr, | |
404 | &dev_attr_temp1_crit.attr, | |
405 | &dev_attr_temp1_min.attr, | |
406 | &dev_attr_temp1_max.attr, | |
407 | &dev_attr_temp1_crit_hyst.attr, | |
408 | &dev_attr_temp1_max_hyst.attr, | |
409 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
410 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
411 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
412 | NULL | |
413 | }; | |
414 | ||
415 | static const struct attribute_group jc42_group = { | |
416 | .attrs = jc42_attributes, | |
417 | }; | |
418 | ||
419 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
420 | static int jc42_detect(struct i2c_client *new_client, | |
421 | struct i2c_board_info *info) | |
422 | { | |
423 | struct i2c_adapter *adapter = new_client->adapter; | |
424 | int i, config, cap, manid, devid; | |
425 | ||
426 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
427 | I2C_FUNC_SMBUS_WORD_DATA)) | |
428 | return -ENODEV; | |
429 | ||
430 | cap = jc42_read_value(new_client, JC42_REG_CAP); | |
431 | config = jc42_read_value(new_client, JC42_REG_CONFIG); | |
432 | manid = jc42_read_value(new_client, JC42_REG_MANID); | |
433 | devid = jc42_read_value(new_client, JC42_REG_DEVICEID); | |
434 | ||
435 | if (cap < 0 || config < 0 || manid < 0 || devid < 0) | |
436 | return -ENODEV; | |
437 | ||
438 | if ((cap & 0xff00) || (config & 0xf800)) | |
439 | return -ENODEV; | |
440 | ||
441 | for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) { | |
442 | struct jc42_chips *chip = &jc42_chips[i]; | |
443 | if (manid == chip->manid && | |
444 | (devid & chip->devid_mask) == chip->devid) { | |
445 | strlcpy(info->type, "jc42", I2C_NAME_SIZE); | |
446 | return 0; | |
447 | } | |
448 | } | |
449 | return -ENODEV; | |
450 | } | |
451 | ||
452 | static int jc42_probe(struct i2c_client *new_client, | |
453 | const struct i2c_device_id *id) | |
454 | { | |
455 | struct jc42_data *data; | |
456 | int config, cap, err; | |
457 | ||
458 | data = kzalloc(sizeof(struct jc42_data), GFP_KERNEL); | |
459 | if (!data) { | |
460 | err = -ENOMEM; | |
461 | goto exit; | |
462 | } | |
463 | ||
464 | i2c_set_clientdata(new_client, data); | |
465 | mutex_init(&data->update_lock); | |
466 | ||
467 | cap = jc42_read_value(new_client, JC42_REG_CAP); | |
468 | if (cap < 0) { | |
469 | err = -EINVAL; | |
470 | goto exit_free; | |
471 | } | |
472 | data->extended = !!(cap & JC42_CAP_RANGE); | |
473 | ||
474 | config = jc42_read_value(new_client, JC42_REG_CONFIG); | |
475 | if (config < 0) { | |
476 | err = -EINVAL; | |
477 | goto exit_free; | |
478 | } | |
479 | data->orig_config = config; | |
480 | if (config & JC42_CFG_SHUTDOWN) { | |
481 | config &= ~JC42_CFG_SHUTDOWN; | |
482 | jc42_write_value(new_client, JC42_REG_CONFIG, config); | |
483 | } | |
484 | data->config = config; | |
485 | ||
486 | /* Register sysfs hooks */ | |
487 | err = sysfs_create_group(&new_client->dev.kobj, &jc42_group); | |
488 | if (err) | |
489 | goto exit_free; | |
490 | ||
491 | data->hwmon_dev = hwmon_device_register(&new_client->dev); | |
492 | if (IS_ERR(data->hwmon_dev)) { | |
493 | err = PTR_ERR(data->hwmon_dev); | |
494 | goto exit_remove; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | ||
499 | exit_remove: | |
500 | sysfs_remove_group(&new_client->dev.kobj, &jc42_group); | |
501 | exit_free: | |
502 | kfree(data); | |
503 | exit: | |
504 | return err; | |
505 | } | |
506 | ||
507 | static int jc42_remove(struct i2c_client *client) | |
508 | { | |
509 | struct jc42_data *data = i2c_get_clientdata(client); | |
510 | hwmon_device_unregister(data->hwmon_dev); | |
511 | sysfs_remove_group(&client->dev.kobj, &jc42_group); | |
512 | if (data->config != data->orig_config) | |
513 | jc42_write_value(client, JC42_REG_CONFIG, data->orig_config); | |
514 | kfree(data); | |
515 | return 0; | |
516 | } | |
517 | ||
518 | /* All registers are word-sized. */ | |
519 | static int jc42_read_value(struct i2c_client *client, u8 reg) | |
520 | { | |
521 | int ret = i2c_smbus_read_word_data(client, reg); | |
522 | if (ret < 0) | |
523 | return ret; | |
524 | return swab16(ret); | |
525 | } | |
526 | ||
527 | static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value) | |
528 | { | |
529 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
530 | } | |
531 | ||
532 | static struct jc42_data *jc42_update_device(struct device *dev) | |
533 | { | |
534 | struct i2c_client *client = to_i2c_client(dev); | |
535 | struct jc42_data *data = i2c_get_clientdata(client); | |
536 | struct jc42_data *ret = data; | |
537 | int val; | |
538 | ||
539 | mutex_lock(&data->update_lock); | |
540 | ||
541 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
542 | val = jc42_read_value(client, JC42_REG_TEMP); | |
543 | if (val < 0) { | |
544 | ret = ERR_PTR(val); | |
545 | goto abort; | |
546 | } | |
547 | data->temp_input = val; | |
548 | ||
549 | val = jc42_read_value(client, JC42_REG_TEMP_CRITICAL); | |
550 | if (val < 0) { | |
551 | ret = ERR_PTR(val); | |
552 | goto abort; | |
553 | } | |
554 | data->temp_crit = val; | |
555 | ||
556 | val = jc42_read_value(client, JC42_REG_TEMP_LOWER); | |
557 | if (val < 0) { | |
558 | ret = ERR_PTR(val); | |
559 | goto abort; | |
560 | } | |
561 | data->temp_min = val; | |
562 | ||
563 | val = jc42_read_value(client, JC42_REG_TEMP_UPPER); | |
564 | if (val < 0) { | |
565 | ret = ERR_PTR(val); | |
566 | goto abort; | |
567 | } | |
568 | data->temp_max = val; | |
569 | ||
570 | data->last_updated = jiffies; | |
571 | data->valid = true; | |
572 | } | |
573 | abort: | |
574 | mutex_unlock(&data->update_lock); | |
575 | return ret; | |
576 | } | |
577 | ||
578 | static int __init sensors_jc42_init(void) | |
579 | { | |
580 | return i2c_add_driver(&jc42_driver); | |
581 | } | |
582 | ||
583 | static void __exit sensors_jc42_exit(void) | |
584 | { | |
585 | i2c_del_driver(&jc42_driver); | |
586 | } | |
587 | ||
588 | MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>"); | |
589 | MODULE_DESCRIPTION("JC42 driver"); | |
590 | MODULE_LICENSE("GPL"); | |
591 | ||
592 | module_init(sensors_jc42_init); | |
593 | module_exit(sensors_jc42_exit); |