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Guenter Roeck4453d732010-08-09 17:21:08 -07001/*
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 */
36static 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)
Clemens Ladisch2c6315d2011-02-16 08:02:38 -050056#define JC42_CFG_TCRIT_LOCK (1 << 6)
57#define JC42_CFG_EVENT_LOCK (1 << 7)
Guenter Roeck4453d732010-08-09 17:21:08 -070058#define JC42_CFG_SHUTDOWN (1 << 8)
59#define JC42_CFG_HYST_SHIFT 9
Jean Delvare2ccc8732012-07-26 22:13:47 +020060#define JC42_CFG_HYST_MASK (0x03 << 9)
Guenter Roeck4453d732010-08-09 17:21:08 -070061
62/* Capabilities */
63#define JC42_CAP_RANGE (1 << 2)
64
65/* Manufacturer IDs */
66#define ADT_MANID 0x11d4 /* Analog Devices */
Guenter Roeck1bd612a2012-03-05 11:13:52 -080067#define ATMEL_MANID 0x001f /* Atmel */
Guenter Roeck4453d732010-08-09 17:21:08 -070068#define MAX_MANID 0x004d /* Maxim */
69#define IDT_MANID 0x00b3 /* IDT */
70#define MCP_MANID 0x0054 /* Microchip */
71#define NXP_MANID 0x1131 /* NXP Semiconductors */
72#define ONS_MANID 0x1b09 /* ON Semiconductor */
73#define STM_MANID 0x104a /* ST Microelectronics */
74
75/* Supported chips */
76
77/* Analog Devices */
78#define ADT7408_DEVID 0x0801
79#define ADT7408_DEVID_MASK 0xffff
80
Guenter Roeck1bd612a2012-03-05 11:13:52 -080081/* Atmel */
82#define AT30TS00_DEVID 0x8201
83#define AT30TS00_DEVID_MASK 0xffff
84
Guenter Roeck4453d732010-08-09 17:21:08 -070085/* IDT */
86#define TS3000B3_DEVID 0x2903 /* Also matches TSE2002B3 */
87#define TS3000B3_DEVID_MASK 0xffff
88
Guenter Roeck1bd612a2012-03-05 11:13:52 -080089#define TS3000GB2_DEVID 0x2912 /* Also matches TSE2002GB2 */
90#define TS3000GB2_DEVID_MASK 0xffff
91
Guenter Roeck4453d732010-08-09 17:21:08 -070092/* Maxim */
93#define MAX6604_DEVID 0x3e00
94#define MAX6604_DEVID_MASK 0xffff
95
96/* Microchip */
Guenter Roeck1bd612a2012-03-05 11:13:52 -080097#define MCP9804_DEVID 0x0200
98#define MCP9804_DEVID_MASK 0xfffc
99
Guenter Roeck4453d732010-08-09 17:21:08 -0700100#define MCP98242_DEVID 0x2000
101#define MCP98242_DEVID_MASK 0xfffc
102
103#define MCP98243_DEVID 0x2100
104#define MCP98243_DEVID_MASK 0xfffc
105
Guenter Roeckd4768282013-01-28 20:35:19 -0800106#define MCP98244_DEVID 0x2200
107#define MCP98244_DEVID_MASK 0xfffc
108
Guenter Roeck4453d732010-08-09 17:21:08 -0700109#define MCP9843_DEVID 0x0000 /* Also matches mcp9805 */
110#define MCP9843_DEVID_MASK 0xfffe
111
112/* NXP */
113#define SE97_DEVID 0xa200
114#define SE97_DEVID_MASK 0xfffc
115
116#define SE98_DEVID 0xa100
117#define SE98_DEVID_MASK 0xfffc
118
119/* ON Semiconductor */
120#define CAT6095_DEVID 0x0800 /* Also matches CAT34TS02 */
121#define CAT6095_DEVID_MASK 0xffe0
122
123/* ST Microelectronics */
124#define STTS424_DEVID 0x0101
125#define STTS424_DEVID_MASK 0xffff
126
127#define STTS424E_DEVID 0x0000
128#define STTS424E_DEVID_MASK 0xfffe
129
Jean Delvare4de86122012-03-05 08:32:00 -0500130#define STTS2002_DEVID 0x0300
131#define STTS2002_DEVID_MASK 0xffff
132
133#define STTS3000_DEVID 0x0200
134#define STTS3000_DEVID_MASK 0xffff
135
Guenter Roeck4453d732010-08-09 17:21:08 -0700136static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 };
137
138struct jc42_chips {
139 u16 manid;
140 u16 devid;
141 u16 devid_mask;
142};
143
144static struct jc42_chips jc42_chips[] = {
145 { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK },
Guenter Roeck1bd612a2012-03-05 11:13:52 -0800146 { ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK },
Guenter Roeck4453d732010-08-09 17:21:08 -0700147 { IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK },
Guenter Roeck1bd612a2012-03-05 11:13:52 -0800148 { IDT_MANID, TS3000GB2_DEVID, TS3000GB2_DEVID_MASK },
Guenter Roeck4453d732010-08-09 17:21:08 -0700149 { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK },
Guenter Roeck1bd612a2012-03-05 11:13:52 -0800150 { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK },
Guenter Roeck4453d732010-08-09 17:21:08 -0700151 { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK },
152 { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK },
Guenter Roeckd4768282013-01-28 20:35:19 -0800153 { MCP_MANID, MCP98244_DEVID, MCP98244_DEVID_MASK },
Guenter Roeck4453d732010-08-09 17:21:08 -0700154 { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK },
155 { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK },
156 { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK },
157 { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK },
158 { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK },
159 { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK },
Jean Delvare4de86122012-03-05 08:32:00 -0500160 { STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK },
161 { STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK },
Guenter Roeck4453d732010-08-09 17:21:08 -0700162};
163
164/* Each client has this additional data */
165struct jc42_data {
166 struct device *hwmon_dev;
167 struct mutex update_lock; /* protect register access */
168 bool extended; /* true if extended range supported */
169 bool valid;
170 unsigned long last_updated; /* In jiffies */
171 u16 orig_config; /* original configuration */
172 u16 config; /* current configuration */
173 u16 temp_input; /* Temperatures */
174 u16 temp_crit;
175 u16 temp_min;
176 u16 temp_max;
177};
178
179static int jc42_probe(struct i2c_client *client,
180 const struct i2c_device_id *id);
181static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info);
182static int jc42_remove(struct i2c_client *client);
Guenter Roeck4453d732010-08-09 17:21:08 -0700183
184static struct jc42_data *jc42_update_device(struct device *dev);
185
186static const struct i2c_device_id jc42_id[] = {
Guenter Roeck4453d732010-08-09 17:21:08 -0700187 { "jc42", 0 },
Guenter Roeck4453d732010-08-09 17:21:08 -0700188 { }
189};
190MODULE_DEVICE_TABLE(i2c, jc42_id);
191
192#ifdef CONFIG_PM
193
194static int jc42_suspend(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;
Jean Delvare90f41022011-11-04 12:00:47 +0100200 i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
Guenter Roeck4453d732010-08-09 17:21:08 -0700201 return 0;
202}
203
204static int jc42_resume(struct device *dev)
205{
206 struct i2c_client *client = to_i2c_client(dev);
207 struct jc42_data *data = i2c_get_clientdata(client);
208
209 data->config &= ~JC42_CFG_SHUTDOWN;
Jean Delvare90f41022011-11-04 12:00:47 +0100210 i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
Guenter Roeck4453d732010-08-09 17:21:08 -0700211 return 0;
212}
213
214static const struct dev_pm_ops jc42_dev_pm_ops = {
215 .suspend = jc42_suspend,
216 .resume = jc42_resume,
217};
218
219#define JC42_DEV_PM_OPS (&jc42_dev_pm_ops)
220#else
221#define JC42_DEV_PM_OPS NULL
222#endif /* CONFIG_PM */
223
224/* This is the driver that will be inserted */
225static struct i2c_driver jc42_driver = {
Jean Delvare774466a2011-05-25 20:43:32 +0200226 .class = I2C_CLASS_SPD,
Guenter Roeck4453d732010-08-09 17:21:08 -0700227 .driver = {
228 .name = "jc42",
229 .pm = JC42_DEV_PM_OPS,
230 },
231 .probe = jc42_probe,
232 .remove = jc42_remove,
233 .id_table = jc42_id,
234 .detect = jc42_detect,
235 .address_list = normal_i2c,
236};
237
238#define JC42_TEMP_MIN_EXTENDED (-40000)
239#define JC42_TEMP_MIN 0
240#define JC42_TEMP_MAX 125000
241
242static u16 jc42_temp_to_reg(int temp, bool extended)
243{
Guenter Roeck2a844c12013-01-09 08:09:34 -0800244 int ntemp = clamp_val(temp,
245 extended ? JC42_TEMP_MIN_EXTENDED :
246 JC42_TEMP_MIN, JC42_TEMP_MAX);
Guenter Roeck4453d732010-08-09 17:21:08 -0700247
248 /* convert from 0.001 to 0.0625 resolution */
249 return (ntemp * 2 / 125) & 0x1fff;
250}
251
252static int jc42_temp_from_reg(s16 reg)
253{
254 reg &= 0x1fff;
255
256 /* sign extend register */
257 if (reg & 0x1000)
258 reg |= 0xf000;
259
260 /* convert from 0.0625 to 0.001 resolution */
261 return reg * 125 / 2;
262}
263
264/* sysfs stuff */
265
266/* read routines for temperature limits */
267#define show(value) \
268static ssize_t show_##value(struct device *dev, \
269 struct device_attribute *attr, \
270 char *buf) \
271{ \
272 struct jc42_data *data = jc42_update_device(dev); \
273 if (IS_ERR(data)) \
274 return PTR_ERR(data); \
275 return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value)); \
276}
277
278show(temp_input);
279show(temp_crit);
280show(temp_min);
281show(temp_max);
282
283/* read routines for hysteresis values */
284static ssize_t show_temp_crit_hyst(struct device *dev,
285 struct device_attribute *attr, char *buf)
286{
287 struct jc42_data *data = jc42_update_device(dev);
288 int temp, hyst;
289
290 if (IS_ERR(data))
291 return PTR_ERR(data);
292
293 temp = jc42_temp_from_reg(data->temp_crit);
Jean Delvare2ccc8732012-07-26 22:13:47 +0200294 hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
295 >> JC42_CFG_HYST_SHIFT];
Guenter Roeck4453d732010-08-09 17:21:08 -0700296 return sprintf(buf, "%d\n", temp - hyst);
297}
298
299static ssize_t show_temp_max_hyst(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
302 struct jc42_data *data = jc42_update_device(dev);
303 int temp, hyst;
304
305 if (IS_ERR(data))
306 return PTR_ERR(data);
307
308 temp = jc42_temp_from_reg(data->temp_max);
Jean Delvare2ccc8732012-07-26 22:13:47 +0200309 hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
310 >> JC42_CFG_HYST_SHIFT];
Guenter Roeck4453d732010-08-09 17:21:08 -0700311 return sprintf(buf, "%d\n", temp - hyst);
312}
313
314/* write routines */
315#define set(value, reg) \
316static ssize_t set_##value(struct device *dev, \
317 struct device_attribute *attr, \
318 const char *buf, size_t count) \
319{ \
320 struct i2c_client *client = to_i2c_client(dev); \
321 struct jc42_data *data = i2c_get_clientdata(client); \
322 int err, ret = count; \
323 long val; \
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100324 if (kstrtol(buf, 10, &val) < 0) \
Guenter Roeck4453d732010-08-09 17:21:08 -0700325 return -EINVAL; \
326 mutex_lock(&data->update_lock); \
327 data->value = jc42_temp_to_reg(val, data->extended); \
Jean Delvare90f41022011-11-04 12:00:47 +0100328 err = i2c_smbus_write_word_swapped(client, reg, data->value); \
Guenter Roeck4453d732010-08-09 17:21:08 -0700329 if (err < 0) \
330 ret = err; \
331 mutex_unlock(&data->update_lock); \
332 return ret; \
333}
334
335set(temp_min, JC42_REG_TEMP_LOWER);
336set(temp_max, JC42_REG_TEMP_UPPER);
337set(temp_crit, JC42_REG_TEMP_CRITICAL);
338
Guenter Roeck5d577db2012-01-19 11:02:19 -0800339/*
340 * JC42.4 compliant chips only support four hysteresis values.
341 * Pick best choice and go from there.
342 */
Guenter Roeck4453d732010-08-09 17:21:08 -0700343static ssize_t set_temp_crit_hyst(struct device *dev,
344 struct device_attribute *attr,
345 const char *buf, size_t count)
346{
347 struct i2c_client *client = to_i2c_client(dev);
348 struct jc42_data *data = i2c_get_clientdata(client);
Clemens Ladische8667292011-02-16 08:01:49 -0500349 unsigned long val;
Guenter Roeck4453d732010-08-09 17:21:08 -0700350 int diff, hyst;
351 int err;
352 int ret = count;
353
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100354 if (kstrtoul(buf, 10, &val) < 0)
Guenter Roeck4453d732010-08-09 17:21:08 -0700355 return -EINVAL;
356
357 diff = jc42_temp_from_reg(data->temp_crit) - val;
358 hyst = 0;
359 if (diff > 0) {
360 if (diff < 2250)
361 hyst = 1; /* 1.5 degrees C */
362 else if (diff < 4500)
363 hyst = 2; /* 3.0 degrees C */
364 else
365 hyst = 3; /* 6.0 degrees C */
366 }
367
368 mutex_lock(&data->update_lock);
Jean Delvare2ccc8732012-07-26 22:13:47 +0200369 data->config = (data->config & ~JC42_CFG_HYST_MASK)
Guenter Roeck4453d732010-08-09 17:21:08 -0700370 | (hyst << JC42_CFG_HYST_SHIFT);
Jean Delvare90f41022011-11-04 12:00:47 +0100371 err = i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG,
372 data->config);
Guenter Roeck4453d732010-08-09 17:21:08 -0700373 if (err < 0)
374 ret = err;
375 mutex_unlock(&data->update_lock);
376 return ret;
377}
378
379static ssize_t show_alarm(struct device *dev,
380 struct device_attribute *attr, char *buf)
381{
382 u16 bit = to_sensor_dev_attr(attr)->index;
383 struct jc42_data *data = jc42_update_device(dev);
384 u16 val;
385
386 if (IS_ERR(data))
387 return PTR_ERR(data);
388
389 val = data->temp_input;
390 if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY))
391 val = 0;
392 return sprintf(buf, "%u\n", (val >> bit) & 1);
393}
394
395static DEVICE_ATTR(temp1_input, S_IRUGO,
396 show_temp_input, NULL);
Clemens Ladisch2c6315d2011-02-16 08:02:38 -0500397static DEVICE_ATTR(temp1_crit, S_IRUGO,
Guenter Roeck4453d732010-08-09 17:21:08 -0700398 show_temp_crit, set_temp_crit);
Clemens Ladisch2c6315d2011-02-16 08:02:38 -0500399static DEVICE_ATTR(temp1_min, S_IRUGO,
Guenter Roeck4453d732010-08-09 17:21:08 -0700400 show_temp_min, set_temp_min);
Clemens Ladisch2c6315d2011-02-16 08:02:38 -0500401static DEVICE_ATTR(temp1_max, S_IRUGO,
Guenter Roeck4453d732010-08-09 17:21:08 -0700402 show_temp_max, set_temp_max);
403
Clemens Ladisch2c6315d2011-02-16 08:02:38 -0500404static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
Guenter Roeck4453d732010-08-09 17:21:08 -0700405 show_temp_crit_hyst, set_temp_crit_hyst);
406static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
407 show_temp_max_hyst, NULL);
408
409static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
410 JC42_ALARM_CRIT_BIT);
411static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
412 JC42_ALARM_MIN_BIT);
413static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
414 JC42_ALARM_MAX_BIT);
415
416static struct attribute *jc42_attributes[] = {
417 &dev_attr_temp1_input.attr,
418 &dev_attr_temp1_crit.attr,
419 &dev_attr_temp1_min.attr,
420 &dev_attr_temp1_max.attr,
421 &dev_attr_temp1_crit_hyst.attr,
422 &dev_attr_temp1_max_hyst.attr,
423 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
424 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
425 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
426 NULL
427};
428
Al Viro587a1f12011-07-23 23:11:19 -0400429static umode_t jc42_attribute_mode(struct kobject *kobj,
Clemens Ladisch2c6315d2011-02-16 08:02:38 -0500430 struct attribute *attr, int index)
431{
432 struct device *dev = container_of(kobj, struct device, kobj);
433 struct i2c_client *client = to_i2c_client(dev);
434 struct jc42_data *data = i2c_get_clientdata(client);
435 unsigned int config = data->config;
436 bool readonly;
437
438 if (attr == &dev_attr_temp1_crit.attr)
439 readonly = config & JC42_CFG_TCRIT_LOCK;
440 else if (attr == &dev_attr_temp1_min.attr ||
441 attr == &dev_attr_temp1_max.attr)
442 readonly = config & JC42_CFG_EVENT_LOCK;
443 else if (attr == &dev_attr_temp1_crit_hyst.attr)
444 readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK);
445 else
446 readonly = true;
447
448 return S_IRUGO | (readonly ? 0 : S_IWUSR);
449}
450
Guenter Roeck4453d732010-08-09 17:21:08 -0700451static const struct attribute_group jc42_group = {
452 .attrs = jc42_attributes,
Clemens Ladisch2c6315d2011-02-16 08:02:38 -0500453 .is_visible = jc42_attribute_mode,
Guenter Roeck4453d732010-08-09 17:21:08 -0700454};
455
456/* Return 0 if detection is successful, -ENODEV otherwise */
Guenter Roeckf15df572012-02-22 08:56:47 -0800457static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info)
Guenter Roeck4453d732010-08-09 17:21:08 -0700458{
Guenter Roeckf15df572012-02-22 08:56:47 -0800459 struct i2c_adapter *adapter = client->adapter;
Guenter Roeck4453d732010-08-09 17:21:08 -0700460 int i, config, cap, manid, devid;
461
462 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
463 I2C_FUNC_SMBUS_WORD_DATA))
464 return -ENODEV;
465
Guenter Roeckf15df572012-02-22 08:56:47 -0800466 cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
467 config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
468 manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID);
469 devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID);
Guenter Roeck4453d732010-08-09 17:21:08 -0700470
471 if (cap < 0 || config < 0 || manid < 0 || devid < 0)
472 return -ENODEV;
473
474 if ((cap & 0xff00) || (config & 0xf800))
475 return -ENODEV;
476
477 for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) {
478 struct jc42_chips *chip = &jc42_chips[i];
479 if (manid == chip->manid &&
480 (devid & chip->devid_mask) == chip->devid) {
481 strlcpy(info->type, "jc42", I2C_NAME_SIZE);
482 return 0;
483 }
484 }
485 return -ENODEV;
486}
487
Guenter Roeckf15df572012-02-22 08:56:47 -0800488static int jc42_probe(struct i2c_client *client, const struct i2c_device_id *id)
Guenter Roeck4453d732010-08-09 17:21:08 -0700489{
490 struct jc42_data *data;
491 int config, cap, err;
Guenter Roeckf15df572012-02-22 08:56:47 -0800492 struct device *dev = &client->dev;
Guenter Roeck4453d732010-08-09 17:21:08 -0700493
Guenter Roeckf15df572012-02-22 08:56:47 -0800494 data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL);
495 if (!data)
496 return -ENOMEM;
Guenter Roeck4453d732010-08-09 17:21:08 -0700497
Guenter Roeckf15df572012-02-22 08:56:47 -0800498 i2c_set_clientdata(client, data);
Guenter Roeck4453d732010-08-09 17:21:08 -0700499 mutex_init(&data->update_lock);
500
Guenter Roeckf15df572012-02-22 08:56:47 -0800501 cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
502 if (cap < 0)
503 return cap;
504
Guenter Roeck4453d732010-08-09 17:21:08 -0700505 data->extended = !!(cap & JC42_CAP_RANGE);
506
Guenter Roeckf15df572012-02-22 08:56:47 -0800507 config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
508 if (config < 0)
509 return config;
510
Guenter Roeck4453d732010-08-09 17:21:08 -0700511 data->orig_config = config;
512 if (config & JC42_CFG_SHUTDOWN) {
513 config &= ~JC42_CFG_SHUTDOWN;
Guenter Roeckf15df572012-02-22 08:56:47 -0800514 i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
Guenter Roeck4453d732010-08-09 17:21:08 -0700515 }
516 data->config = config;
517
518 /* Register sysfs hooks */
Guenter Roeckf15df572012-02-22 08:56:47 -0800519 err = sysfs_create_group(&dev->kobj, &jc42_group);
Guenter Roeck4453d732010-08-09 17:21:08 -0700520 if (err)
Guenter Roeckf15df572012-02-22 08:56:47 -0800521 return err;
Guenter Roeck4453d732010-08-09 17:21:08 -0700522
Guenter Roeckf15df572012-02-22 08:56:47 -0800523 data->hwmon_dev = hwmon_device_register(dev);
Guenter Roeck4453d732010-08-09 17:21:08 -0700524 if (IS_ERR(data->hwmon_dev)) {
525 err = PTR_ERR(data->hwmon_dev);
526 goto exit_remove;
527 }
528
529 return 0;
530
531exit_remove:
Guenter Roeckf15df572012-02-22 08:56:47 -0800532 sysfs_remove_group(&dev->kobj, &jc42_group);
Guenter Roeck4453d732010-08-09 17:21:08 -0700533 return err;
534}
535
536static int jc42_remove(struct i2c_client *client)
537{
538 struct jc42_data *data = i2c_get_clientdata(client);
539 hwmon_device_unregister(data->hwmon_dev);
540 sysfs_remove_group(&client->dev.kobj, &jc42_group);
Jean Delvare5953e272012-07-26 22:18:43 +0200541
542 /* Restore original configuration except hysteresis */
543 if ((data->config & ~JC42_CFG_HYST_MASK) !=
544 (data->orig_config & ~JC42_CFG_HYST_MASK)) {
545 int config;
546
547 config = (data->orig_config & ~JC42_CFG_HYST_MASK)
548 | (data->config & JC42_CFG_HYST_MASK);
549 i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
550 }
Guenter Roeck4453d732010-08-09 17:21:08 -0700551 return 0;
552}
553
Guenter Roeck4453d732010-08-09 17:21:08 -0700554static struct jc42_data *jc42_update_device(struct device *dev)
555{
556 struct i2c_client *client = to_i2c_client(dev);
557 struct jc42_data *data = i2c_get_clientdata(client);
558 struct jc42_data *ret = data;
559 int val;
560
561 mutex_lock(&data->update_lock);
562
563 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
Jean Delvare90f41022011-11-04 12:00:47 +0100564 val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP);
Guenter Roeck4453d732010-08-09 17:21:08 -0700565 if (val < 0) {
566 ret = ERR_PTR(val);
567 goto abort;
568 }
569 data->temp_input = val;
570
Jean Delvare90f41022011-11-04 12:00:47 +0100571 val = i2c_smbus_read_word_swapped(client,
572 JC42_REG_TEMP_CRITICAL);
Guenter Roeck4453d732010-08-09 17:21:08 -0700573 if (val < 0) {
574 ret = ERR_PTR(val);
575 goto abort;
576 }
577 data->temp_crit = val;
578
Jean Delvare90f41022011-11-04 12:00:47 +0100579 val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_LOWER);
Guenter Roeck4453d732010-08-09 17:21:08 -0700580 if (val < 0) {
581 ret = ERR_PTR(val);
582 goto abort;
583 }
584 data->temp_min = val;
585
Jean Delvare90f41022011-11-04 12:00:47 +0100586 val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_UPPER);
Guenter Roeck4453d732010-08-09 17:21:08 -0700587 if (val < 0) {
588 ret = ERR_PTR(val);
589 goto abort;
590 }
591 data->temp_max = val;
592
593 data->last_updated = jiffies;
594 data->valid = true;
595 }
596abort:
597 mutex_unlock(&data->update_lock);
598 return ret;
599}
600
Axel Linf0967ee2012-01-20 15:38:18 +0800601module_i2c_driver(jc42_driver);
Guenter Roeck4453d732010-08-09 17:21:08 -0700602
Guenter Roeckbb9a80e2012-06-22 12:07:25 -0700603MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
Guenter Roeck4453d732010-08-09 17:21:08 -0700604MODULE_DESCRIPTION("JC42 driver");
605MODULE_LICENSE("GPL");