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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) | |
2c6315da CL |
56 | #define JC42_CFG_TCRIT_LOCK (1 << 6) |
57 | #define JC42_CFG_EVENT_LOCK (1 << 7) | |
4453d736 GR |
58 | #define JC42_CFG_SHUTDOWN (1 << 8) |
59 | #define JC42_CFG_HYST_SHIFT 9 | |
60 | #define JC42_CFG_HYST_MASK 0x03 | |
61 | ||
62 | /* Capabilities */ | |
63 | #define JC42_CAP_RANGE (1 << 2) | |
64 | ||
65 | /* Manufacturer IDs */ | |
66 | #define ADT_MANID 0x11d4 /* Analog Devices */ | |
67 | #define MAX_MANID 0x004d /* Maxim */ | |
68 | #define IDT_MANID 0x00b3 /* IDT */ | |
69 | #define MCP_MANID 0x0054 /* Microchip */ | |
70 | #define NXP_MANID 0x1131 /* NXP Semiconductors */ | |
71 | #define ONS_MANID 0x1b09 /* ON Semiconductor */ | |
72 | #define STM_MANID 0x104a /* ST Microelectronics */ | |
73 | ||
74 | /* Supported chips */ | |
75 | ||
76 | /* Analog Devices */ | |
77 | #define ADT7408_DEVID 0x0801 | |
78 | #define ADT7408_DEVID_MASK 0xffff | |
79 | ||
80 | /* IDT */ | |
81 | #define TS3000B3_DEVID 0x2903 /* Also matches TSE2002B3 */ | |
82 | #define TS3000B3_DEVID_MASK 0xffff | |
83 | ||
84 | /* Maxim */ | |
85 | #define MAX6604_DEVID 0x3e00 | |
86 | #define MAX6604_DEVID_MASK 0xffff | |
87 | ||
88 | /* Microchip */ | |
89 | #define MCP98242_DEVID 0x2000 | |
90 | #define MCP98242_DEVID_MASK 0xfffc | |
91 | ||
92 | #define MCP98243_DEVID 0x2100 | |
93 | #define MCP98243_DEVID_MASK 0xfffc | |
94 | ||
95 | #define MCP9843_DEVID 0x0000 /* Also matches mcp9805 */ | |
96 | #define MCP9843_DEVID_MASK 0xfffe | |
97 | ||
98 | /* NXP */ | |
99 | #define SE97_DEVID 0xa200 | |
100 | #define SE97_DEVID_MASK 0xfffc | |
101 | ||
102 | #define SE98_DEVID 0xa100 | |
103 | #define SE98_DEVID_MASK 0xfffc | |
104 | ||
105 | /* ON Semiconductor */ | |
106 | #define CAT6095_DEVID 0x0800 /* Also matches CAT34TS02 */ | |
107 | #define CAT6095_DEVID_MASK 0xffe0 | |
108 | ||
109 | /* ST Microelectronics */ | |
110 | #define STTS424_DEVID 0x0101 | |
111 | #define STTS424_DEVID_MASK 0xffff | |
112 | ||
113 | #define STTS424E_DEVID 0x0000 | |
114 | #define STTS424E_DEVID_MASK 0xfffe | |
115 | ||
116 | static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 }; | |
117 | ||
118 | struct jc42_chips { | |
119 | u16 manid; | |
120 | u16 devid; | |
121 | u16 devid_mask; | |
122 | }; | |
123 | ||
124 | static struct jc42_chips jc42_chips[] = { | |
125 | { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK }, | |
126 | { IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK }, | |
127 | { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK }, | |
128 | { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK }, | |
129 | { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK }, | |
130 | { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK }, | |
131 | { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK }, | |
132 | { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK }, | |
133 | { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK }, | |
134 | { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK }, | |
135 | { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK }, | |
136 | }; | |
137 | ||
138 | /* Each client has this additional data */ | |
139 | struct jc42_data { | |
140 | struct device *hwmon_dev; | |
141 | struct mutex update_lock; /* protect register access */ | |
142 | bool extended; /* true if extended range supported */ | |
143 | bool valid; | |
144 | unsigned long last_updated; /* In jiffies */ | |
145 | u16 orig_config; /* original configuration */ | |
146 | u16 config; /* current configuration */ | |
147 | u16 temp_input; /* Temperatures */ | |
148 | u16 temp_crit; | |
149 | u16 temp_min; | |
150 | u16 temp_max; | |
151 | }; | |
152 | ||
153 | static int jc42_probe(struct i2c_client *client, | |
154 | const struct i2c_device_id *id); | |
155 | static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info); | |
156 | static int jc42_remove(struct i2c_client *client); | |
157 | static int jc42_read_value(struct i2c_client *client, u8 reg); | |
158 | static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value); | |
159 | ||
160 | static struct jc42_data *jc42_update_device(struct device *dev); | |
161 | ||
162 | static const struct i2c_device_id jc42_id[] = { | |
163 | { "adt7408", 0 }, | |
164 | { "cat94ts02", 0 }, | |
165 | { "cat6095", 0 }, | |
166 | { "jc42", 0 }, | |
167 | { "max6604", 0 }, | |
168 | { "mcp9805", 0 }, | |
169 | { "mcp98242", 0 }, | |
170 | { "mcp98243", 0 }, | |
171 | { "mcp9843", 0 }, | |
172 | { "se97", 0 }, | |
173 | { "se97b", 0 }, | |
174 | { "se98", 0 }, | |
175 | { "stts424", 0 }, | |
176 | { "tse2002b3", 0 }, | |
177 | { "ts3000b3", 0 }, | |
178 | { } | |
179 | }; | |
180 | MODULE_DEVICE_TABLE(i2c, jc42_id); | |
181 | ||
182 | #ifdef CONFIG_PM | |
183 | ||
184 | static int jc42_suspend(struct device *dev) | |
185 | { | |
186 | struct i2c_client *client = to_i2c_client(dev); | |
187 | struct jc42_data *data = i2c_get_clientdata(client); | |
188 | ||
189 | data->config |= JC42_CFG_SHUTDOWN; | |
190 | jc42_write_value(client, JC42_REG_CONFIG, data->config); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int jc42_resume(struct device *dev) | |
195 | { | |
196 | struct i2c_client *client = to_i2c_client(dev); | |
197 | struct jc42_data *data = i2c_get_clientdata(client); | |
198 | ||
199 | data->config &= ~JC42_CFG_SHUTDOWN; | |
200 | jc42_write_value(client, JC42_REG_CONFIG, data->config); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static const struct dev_pm_ops jc42_dev_pm_ops = { | |
205 | .suspend = jc42_suspend, | |
206 | .resume = jc42_resume, | |
207 | }; | |
208 | ||
209 | #define JC42_DEV_PM_OPS (&jc42_dev_pm_ops) | |
210 | #else | |
211 | #define JC42_DEV_PM_OPS NULL | |
212 | #endif /* CONFIG_PM */ | |
213 | ||
214 | /* This is the driver that will be inserted */ | |
215 | static struct i2c_driver jc42_driver = { | |
774466ad | 216 | .class = I2C_CLASS_SPD, |
4453d736 GR |
217 | .driver = { |
218 | .name = "jc42", | |
219 | .pm = JC42_DEV_PM_OPS, | |
220 | }, | |
221 | .probe = jc42_probe, | |
222 | .remove = jc42_remove, | |
223 | .id_table = jc42_id, | |
224 | .detect = jc42_detect, | |
225 | .address_list = normal_i2c, | |
226 | }; | |
227 | ||
228 | #define JC42_TEMP_MIN_EXTENDED (-40000) | |
229 | #define JC42_TEMP_MIN 0 | |
230 | #define JC42_TEMP_MAX 125000 | |
231 | ||
232 | static u16 jc42_temp_to_reg(int temp, bool extended) | |
233 | { | |
234 | int ntemp = SENSORS_LIMIT(temp, | |
235 | extended ? JC42_TEMP_MIN_EXTENDED : | |
236 | JC42_TEMP_MIN, JC42_TEMP_MAX); | |
237 | ||
238 | /* convert from 0.001 to 0.0625 resolution */ | |
239 | return (ntemp * 2 / 125) & 0x1fff; | |
240 | } | |
241 | ||
242 | static int jc42_temp_from_reg(s16 reg) | |
243 | { | |
244 | reg &= 0x1fff; | |
245 | ||
246 | /* sign extend register */ | |
247 | if (reg & 0x1000) | |
248 | reg |= 0xf000; | |
249 | ||
250 | /* convert from 0.0625 to 0.001 resolution */ | |
251 | return reg * 125 / 2; | |
252 | } | |
253 | ||
254 | /* sysfs stuff */ | |
255 | ||
256 | /* read routines for temperature limits */ | |
257 | #define show(value) \ | |
258 | static ssize_t show_##value(struct device *dev, \ | |
259 | struct device_attribute *attr, \ | |
260 | char *buf) \ | |
261 | { \ | |
262 | struct jc42_data *data = jc42_update_device(dev); \ | |
263 | if (IS_ERR(data)) \ | |
264 | return PTR_ERR(data); \ | |
265 | return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value)); \ | |
266 | } | |
267 | ||
268 | show(temp_input); | |
269 | show(temp_crit); | |
270 | show(temp_min); | |
271 | show(temp_max); | |
272 | ||
273 | /* read routines for hysteresis values */ | |
274 | static ssize_t show_temp_crit_hyst(struct device *dev, | |
275 | struct device_attribute *attr, char *buf) | |
276 | { | |
277 | struct jc42_data *data = jc42_update_device(dev); | |
278 | int temp, hyst; | |
279 | ||
280 | if (IS_ERR(data)) | |
281 | return PTR_ERR(data); | |
282 | ||
283 | temp = jc42_temp_from_reg(data->temp_crit); | |
284 | hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT) | |
285 | & JC42_CFG_HYST_MASK]; | |
286 | return sprintf(buf, "%d\n", temp - hyst); | |
287 | } | |
288 | ||
289 | static ssize_t show_temp_max_hyst(struct device *dev, | |
290 | struct device_attribute *attr, char *buf) | |
291 | { | |
292 | struct jc42_data *data = jc42_update_device(dev); | |
293 | int temp, hyst; | |
294 | ||
295 | if (IS_ERR(data)) | |
296 | return PTR_ERR(data); | |
297 | ||
298 | temp = jc42_temp_from_reg(data->temp_max); | |
299 | hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT) | |
300 | & JC42_CFG_HYST_MASK]; | |
301 | return sprintf(buf, "%d\n", temp - hyst); | |
302 | } | |
303 | ||
304 | /* write routines */ | |
305 | #define set(value, reg) \ | |
306 | static ssize_t set_##value(struct device *dev, \ | |
307 | struct device_attribute *attr, \ | |
308 | const char *buf, size_t count) \ | |
309 | { \ | |
310 | struct i2c_client *client = to_i2c_client(dev); \ | |
311 | struct jc42_data *data = i2c_get_clientdata(client); \ | |
312 | int err, ret = count; \ | |
313 | long val; \ | |
314 | if (strict_strtol(buf, 10, &val) < 0) \ | |
315 | return -EINVAL; \ | |
316 | mutex_lock(&data->update_lock); \ | |
317 | data->value = jc42_temp_to_reg(val, data->extended); \ | |
318 | err = jc42_write_value(client, reg, data->value); \ | |
319 | if (err < 0) \ | |
320 | ret = err; \ | |
321 | mutex_unlock(&data->update_lock); \ | |
322 | return ret; \ | |
323 | } | |
324 | ||
325 | set(temp_min, JC42_REG_TEMP_LOWER); | |
326 | set(temp_max, JC42_REG_TEMP_UPPER); | |
327 | set(temp_crit, JC42_REG_TEMP_CRITICAL); | |
328 | ||
329 | /* JC42.4 compliant chips only support four hysteresis values. | |
330 | * Pick best choice and go from there. */ | |
331 | static ssize_t set_temp_crit_hyst(struct device *dev, | |
332 | struct device_attribute *attr, | |
333 | const char *buf, size_t count) | |
334 | { | |
335 | struct i2c_client *client = to_i2c_client(dev); | |
336 | struct jc42_data *data = i2c_get_clientdata(client); | |
e8667296 | 337 | unsigned long val; |
4453d736 GR |
338 | int diff, hyst; |
339 | int err; | |
340 | int ret = count; | |
341 | ||
342 | if (strict_strtoul(buf, 10, &val) < 0) | |
343 | return -EINVAL; | |
344 | ||
345 | diff = jc42_temp_from_reg(data->temp_crit) - val; | |
346 | hyst = 0; | |
347 | if (diff > 0) { | |
348 | if (diff < 2250) | |
349 | hyst = 1; /* 1.5 degrees C */ | |
350 | else if (diff < 4500) | |
351 | hyst = 2; /* 3.0 degrees C */ | |
352 | else | |
353 | hyst = 3; /* 6.0 degrees C */ | |
354 | } | |
355 | ||
356 | mutex_lock(&data->update_lock); | |
357 | data->config = (data->config | |
358 | & ~(JC42_CFG_HYST_MASK << JC42_CFG_HYST_SHIFT)) | |
359 | | (hyst << JC42_CFG_HYST_SHIFT); | |
360 | err = jc42_write_value(client, JC42_REG_CONFIG, data->config); | |
361 | if (err < 0) | |
362 | ret = err; | |
363 | mutex_unlock(&data->update_lock); | |
364 | return ret; | |
365 | } | |
366 | ||
367 | static ssize_t show_alarm(struct device *dev, | |
368 | struct device_attribute *attr, char *buf) | |
369 | { | |
370 | u16 bit = to_sensor_dev_attr(attr)->index; | |
371 | struct jc42_data *data = jc42_update_device(dev); | |
372 | u16 val; | |
373 | ||
374 | if (IS_ERR(data)) | |
375 | return PTR_ERR(data); | |
376 | ||
377 | val = data->temp_input; | |
378 | if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY)) | |
379 | val = 0; | |
380 | return sprintf(buf, "%u\n", (val >> bit) & 1); | |
381 | } | |
382 | ||
383 | static DEVICE_ATTR(temp1_input, S_IRUGO, | |
384 | show_temp_input, NULL); | |
2c6315da | 385 | static DEVICE_ATTR(temp1_crit, S_IRUGO, |
4453d736 | 386 | show_temp_crit, set_temp_crit); |
2c6315da | 387 | static DEVICE_ATTR(temp1_min, S_IRUGO, |
4453d736 | 388 | show_temp_min, set_temp_min); |
2c6315da | 389 | static DEVICE_ATTR(temp1_max, S_IRUGO, |
4453d736 GR |
390 | show_temp_max, set_temp_max); |
391 | ||
2c6315da | 392 | static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, |
4453d736 GR |
393 | show_temp_crit_hyst, set_temp_crit_hyst); |
394 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, | |
395 | show_temp_max_hyst, NULL); | |
396 | ||
397 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, | |
398 | JC42_ALARM_CRIT_BIT); | |
399 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, | |
400 | JC42_ALARM_MIN_BIT); | |
401 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, | |
402 | JC42_ALARM_MAX_BIT); | |
403 | ||
404 | static struct attribute *jc42_attributes[] = { | |
405 | &dev_attr_temp1_input.attr, | |
406 | &dev_attr_temp1_crit.attr, | |
407 | &dev_attr_temp1_min.attr, | |
408 | &dev_attr_temp1_max.attr, | |
409 | &dev_attr_temp1_crit_hyst.attr, | |
410 | &dev_attr_temp1_max_hyst.attr, | |
411 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
412 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
413 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
414 | NULL | |
415 | }; | |
416 | ||
2c6315da CL |
417 | static mode_t jc42_attribute_mode(struct kobject *kobj, |
418 | struct attribute *attr, int index) | |
419 | { | |
420 | struct device *dev = container_of(kobj, struct device, kobj); | |
421 | struct i2c_client *client = to_i2c_client(dev); | |
422 | struct jc42_data *data = i2c_get_clientdata(client); | |
423 | unsigned int config = data->config; | |
424 | bool readonly; | |
425 | ||
426 | if (attr == &dev_attr_temp1_crit.attr) | |
427 | readonly = config & JC42_CFG_TCRIT_LOCK; | |
428 | else if (attr == &dev_attr_temp1_min.attr || | |
429 | attr == &dev_attr_temp1_max.attr) | |
430 | readonly = config & JC42_CFG_EVENT_LOCK; | |
431 | else if (attr == &dev_attr_temp1_crit_hyst.attr) | |
432 | readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK); | |
433 | else | |
434 | readonly = true; | |
435 | ||
436 | return S_IRUGO | (readonly ? 0 : S_IWUSR); | |
437 | } | |
438 | ||
4453d736 GR |
439 | static const struct attribute_group jc42_group = { |
440 | .attrs = jc42_attributes, | |
2c6315da | 441 | .is_visible = jc42_attribute_mode, |
4453d736 GR |
442 | }; |
443 | ||
444 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
445 | static int jc42_detect(struct i2c_client *new_client, | |
446 | struct i2c_board_info *info) | |
447 | { | |
448 | struct i2c_adapter *adapter = new_client->adapter; | |
449 | int i, config, cap, manid, devid; | |
450 | ||
451 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
452 | I2C_FUNC_SMBUS_WORD_DATA)) | |
453 | return -ENODEV; | |
454 | ||
455 | cap = jc42_read_value(new_client, JC42_REG_CAP); | |
456 | config = jc42_read_value(new_client, JC42_REG_CONFIG); | |
457 | manid = jc42_read_value(new_client, JC42_REG_MANID); | |
458 | devid = jc42_read_value(new_client, JC42_REG_DEVICEID); | |
459 | ||
460 | if (cap < 0 || config < 0 || manid < 0 || devid < 0) | |
461 | return -ENODEV; | |
462 | ||
463 | if ((cap & 0xff00) || (config & 0xf800)) | |
464 | return -ENODEV; | |
465 | ||
466 | for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) { | |
467 | struct jc42_chips *chip = &jc42_chips[i]; | |
468 | if (manid == chip->manid && | |
469 | (devid & chip->devid_mask) == chip->devid) { | |
470 | strlcpy(info->type, "jc42", I2C_NAME_SIZE); | |
471 | return 0; | |
472 | } | |
473 | } | |
474 | return -ENODEV; | |
475 | } | |
476 | ||
477 | static int jc42_probe(struct i2c_client *new_client, | |
478 | const struct i2c_device_id *id) | |
479 | { | |
480 | struct jc42_data *data; | |
481 | int config, cap, err; | |
482 | ||
483 | data = kzalloc(sizeof(struct jc42_data), GFP_KERNEL); | |
484 | if (!data) { | |
485 | err = -ENOMEM; | |
486 | goto exit; | |
487 | } | |
488 | ||
489 | i2c_set_clientdata(new_client, data); | |
490 | mutex_init(&data->update_lock); | |
491 | ||
492 | cap = jc42_read_value(new_client, JC42_REG_CAP); | |
493 | if (cap < 0) { | |
494 | err = -EINVAL; | |
495 | goto exit_free; | |
496 | } | |
497 | data->extended = !!(cap & JC42_CAP_RANGE); | |
498 | ||
499 | config = jc42_read_value(new_client, JC42_REG_CONFIG); | |
500 | if (config < 0) { | |
501 | err = -EINVAL; | |
502 | goto exit_free; | |
503 | } | |
504 | data->orig_config = config; | |
505 | if (config & JC42_CFG_SHUTDOWN) { | |
506 | config &= ~JC42_CFG_SHUTDOWN; | |
507 | jc42_write_value(new_client, JC42_REG_CONFIG, config); | |
508 | } | |
509 | data->config = config; | |
510 | ||
511 | /* Register sysfs hooks */ | |
512 | err = sysfs_create_group(&new_client->dev.kobj, &jc42_group); | |
513 | if (err) | |
514 | goto exit_free; | |
515 | ||
516 | data->hwmon_dev = hwmon_device_register(&new_client->dev); | |
517 | if (IS_ERR(data->hwmon_dev)) { | |
518 | err = PTR_ERR(data->hwmon_dev); | |
519 | goto exit_remove; | |
520 | } | |
521 | ||
522 | return 0; | |
523 | ||
524 | exit_remove: | |
525 | sysfs_remove_group(&new_client->dev.kobj, &jc42_group); | |
526 | exit_free: | |
527 | kfree(data); | |
528 | exit: | |
529 | return err; | |
530 | } | |
531 | ||
532 | static int jc42_remove(struct i2c_client *client) | |
533 | { | |
534 | struct jc42_data *data = i2c_get_clientdata(client); | |
535 | hwmon_device_unregister(data->hwmon_dev); | |
536 | sysfs_remove_group(&client->dev.kobj, &jc42_group); | |
537 | if (data->config != data->orig_config) | |
538 | jc42_write_value(client, JC42_REG_CONFIG, data->orig_config); | |
539 | kfree(data); | |
540 | return 0; | |
541 | } | |
542 | ||
543 | /* All registers are word-sized. */ | |
544 | static int jc42_read_value(struct i2c_client *client, u8 reg) | |
545 | { | |
546 | int ret = i2c_smbus_read_word_data(client, reg); | |
547 | if (ret < 0) | |
548 | return ret; | |
549 | return swab16(ret); | |
550 | } | |
551 | ||
552 | static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value) | |
553 | { | |
554 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
555 | } | |
556 | ||
557 | static struct jc42_data *jc42_update_device(struct device *dev) | |
558 | { | |
559 | struct i2c_client *client = to_i2c_client(dev); | |
560 | struct jc42_data *data = i2c_get_clientdata(client); | |
561 | struct jc42_data *ret = data; | |
562 | int val; | |
563 | ||
564 | mutex_lock(&data->update_lock); | |
565 | ||
566 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
567 | val = jc42_read_value(client, JC42_REG_TEMP); | |
568 | if (val < 0) { | |
569 | ret = ERR_PTR(val); | |
570 | goto abort; | |
571 | } | |
572 | data->temp_input = val; | |
573 | ||
574 | val = jc42_read_value(client, JC42_REG_TEMP_CRITICAL); | |
575 | if (val < 0) { | |
576 | ret = ERR_PTR(val); | |
577 | goto abort; | |
578 | } | |
579 | data->temp_crit = val; | |
580 | ||
581 | val = jc42_read_value(client, JC42_REG_TEMP_LOWER); | |
582 | if (val < 0) { | |
583 | ret = ERR_PTR(val); | |
584 | goto abort; | |
585 | } | |
586 | data->temp_min = val; | |
587 | ||
588 | val = jc42_read_value(client, JC42_REG_TEMP_UPPER); | |
589 | if (val < 0) { | |
590 | ret = ERR_PTR(val); | |
591 | goto abort; | |
592 | } | |
593 | data->temp_max = val; | |
594 | ||
595 | data->last_updated = jiffies; | |
596 | data->valid = true; | |
597 | } | |
598 | abort: | |
599 | mutex_unlock(&data->update_lock); | |
600 | return ret; | |
601 | } | |
602 | ||
603 | static int __init sensors_jc42_init(void) | |
604 | { | |
605 | return i2c_add_driver(&jc42_driver); | |
606 | } | |
607 | ||
608 | static void __exit sensors_jc42_exit(void) | |
609 | { | |
610 | i2c_del_driver(&jc42_driver); | |
611 | } | |
612 | ||
613 | MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>"); | |
614 | MODULE_DESCRIPTION("JC42 driver"); | |
615 | MODULE_LICENSE("GPL"); | |
616 | ||
617 | module_init(sensors_jc42_init); | |
618 | module_exit(sensors_jc42_exit); |