Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4453d736 GR |
2 | /* |
3 | * jc42.c - driver for Jedec JC42.4 compliant temperature sensors | |
4 | * | |
5 | * Copyright (c) 2010 Ericsson AB. | |
6 | * | |
7 | * Derived from lm77.c by Andras BALI <drewie@freemail.hu>. | |
8 | * | |
9 | * JC42.4 compliant temperature sensors are typically used on memory modules. | |
4453d736 GR |
10 | */ |
11 | ||
68615eb0 | 12 | #include <linux/bitops.h> |
4453d736 GR |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/hwmon.h> | |
4453d736 GR |
19 | #include <linux/err.h> |
20 | #include <linux/mutex.h> | |
803decce | 21 | #include <linux/of.h> |
4453d736 GR |
22 | |
23 | /* Addresses to scan */ | |
24 | static const unsigned short normal_i2c[] = { | |
25 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, I2C_CLIENT_END }; | |
26 | ||
27 | /* JC42 registers. All registers are 16 bit. */ | |
28 | #define JC42_REG_CAP 0x00 | |
29 | #define JC42_REG_CONFIG 0x01 | |
30 | #define JC42_REG_TEMP_UPPER 0x02 | |
31 | #define JC42_REG_TEMP_LOWER 0x03 | |
32 | #define JC42_REG_TEMP_CRITICAL 0x04 | |
33 | #define JC42_REG_TEMP 0x05 | |
34 | #define JC42_REG_MANID 0x06 | |
35 | #define JC42_REG_DEVICEID 0x07 | |
68615eb0 | 36 | #define JC42_REG_SMBUS 0x22 /* NXP and Atmel, possibly others? */ |
4453d736 GR |
37 | |
38 | /* Status bits in temperature register */ | |
39 | #define JC42_ALARM_CRIT_BIT 15 | |
40 | #define JC42_ALARM_MAX_BIT 14 | |
41 | #define JC42_ALARM_MIN_BIT 13 | |
42 | ||
43 | /* Configuration register defines */ | |
44 | #define JC42_CFG_CRIT_ONLY (1 << 2) | |
2c6315da CL |
45 | #define JC42_CFG_TCRIT_LOCK (1 << 6) |
46 | #define JC42_CFG_EVENT_LOCK (1 << 7) | |
4453d736 GR |
47 | #define JC42_CFG_SHUTDOWN (1 << 8) |
48 | #define JC42_CFG_HYST_SHIFT 9 | |
2ccc8731 | 49 | #define JC42_CFG_HYST_MASK (0x03 << 9) |
4453d736 GR |
50 | |
51 | /* Capabilities */ | |
52 | #define JC42_CAP_RANGE (1 << 2) | |
53 | ||
54 | /* Manufacturer IDs */ | |
55 | #define ADT_MANID 0x11d4 /* Analog Devices */ | |
1bd612a2 | 56 | #define ATMEL_MANID 0x001f /* Atmel */ |
175c490c | 57 | #define ATMEL_MANID2 0x1114 /* Atmel */ |
4453d736 GR |
58 | #define MAX_MANID 0x004d /* Maxim */ |
59 | #define IDT_MANID 0x00b3 /* IDT */ | |
60 | #define MCP_MANID 0x0054 /* Microchip */ | |
61 | #define NXP_MANID 0x1131 /* NXP Semiconductors */ | |
62 | #define ONS_MANID 0x1b09 /* ON Semiconductor */ | |
63 | #define STM_MANID 0x104a /* ST Microelectronics */ | |
568003ce GR |
64 | #define GT_MANID 0x1c68 /* Giantec */ |
65 | #define GT_MANID2 0x132d /* Giantec, 2nd mfg ID */ | |
4453d736 | 66 | |
68615eb0 PR |
67 | /* SMBUS register */ |
68 | #define SMBUS_STMOUT BIT(7) /* SMBus time-out, active low */ | |
69 | ||
4453d736 GR |
70 | /* Supported chips */ |
71 | ||
72 | /* Analog Devices */ | |
73 | #define ADT7408_DEVID 0x0801 | |
74 | #define ADT7408_DEVID_MASK 0xffff | |
75 | ||
1bd612a2 GR |
76 | /* Atmel */ |
77 | #define AT30TS00_DEVID 0x8201 | |
78 | #define AT30TS00_DEVID_MASK 0xffff | |
79 | ||
175c490c GR |
80 | #define AT30TSE004_DEVID 0x2200 |
81 | #define AT30TSE004_DEVID_MASK 0xffff | |
82 | ||
568003ce GR |
83 | /* Giantec */ |
84 | #define GT30TS00_DEVID 0x2200 | |
85 | #define GT30TS00_DEVID_MASK 0xff00 | |
86 | ||
87 | #define GT34TS02_DEVID 0x3300 | |
88 | #define GT34TS02_DEVID_MASK 0xff00 | |
89 | ||
4453d736 | 90 | /* IDT */ |
0ea2f1db GR |
91 | #define TSE2004_DEVID 0x2200 |
92 | #define TSE2004_DEVID_MASK 0xff00 | |
4453d736 | 93 | |
0ea2f1db GR |
94 | #define TS3000_DEVID 0x2900 /* Also matches TSE2002 */ |
95 | #define TS3000_DEVID_MASK 0xff00 | |
96 | ||
97 | #define TS3001_DEVID 0x3000 | |
98 | #define TS3001_DEVID_MASK 0xff00 | |
1bd612a2 | 99 | |
4453d736 GR |
100 | /* Maxim */ |
101 | #define MAX6604_DEVID 0x3e00 | |
102 | #define MAX6604_DEVID_MASK 0xffff | |
103 | ||
104 | /* Microchip */ | |
1bd612a2 GR |
105 | #define MCP9804_DEVID 0x0200 |
106 | #define MCP9804_DEVID_MASK 0xfffc | |
107 | ||
a31887dc AS |
108 | #define MCP9808_DEVID 0x0400 |
109 | #define MCP9808_DEVID_MASK 0xfffc | |
110 | ||
4453d736 GR |
111 | #define MCP98242_DEVID 0x2000 |
112 | #define MCP98242_DEVID_MASK 0xfffc | |
113 | ||
114 | #define MCP98243_DEVID 0x2100 | |
115 | #define MCP98243_DEVID_MASK 0xfffc | |
116 | ||
d4768280 GR |
117 | #define MCP98244_DEVID 0x2200 |
118 | #define MCP98244_DEVID_MASK 0xfffc | |
119 | ||
4453d736 GR |
120 | #define MCP9843_DEVID 0x0000 /* Also matches mcp9805 */ |
121 | #define MCP9843_DEVID_MASK 0xfffe | |
122 | ||
123 | /* NXP */ | |
124 | #define SE97_DEVID 0xa200 | |
125 | #define SE97_DEVID_MASK 0xfffc | |
126 | ||
127 | #define SE98_DEVID 0xa100 | |
128 | #define SE98_DEVID_MASK 0xfffc | |
129 | ||
130 | /* ON Semiconductor */ | |
131 | #define CAT6095_DEVID 0x0800 /* Also matches CAT34TS02 */ | |
132 | #define CAT6095_DEVID_MASK 0xffe0 | |
133 | ||
99b981b2 GR |
134 | #define CAT34TS02C_DEVID 0x0a00 |
135 | #define CAT34TS02C_DEVID_MASK 0xfff0 | |
136 | ||
568003ce GR |
137 | #define CAT34TS04_DEVID 0x2200 |
138 | #define CAT34TS04_DEVID_MASK 0xfff0 | |
139 | ||
bf4d8430 GR |
140 | #define N34TS04_DEVID 0x2230 |
141 | #define N34TS04_DEVID_MASK 0xfff0 | |
142 | ||
4453d736 GR |
143 | /* ST Microelectronics */ |
144 | #define STTS424_DEVID 0x0101 | |
145 | #define STTS424_DEVID_MASK 0xffff | |
146 | ||
147 | #define STTS424E_DEVID 0x0000 | |
148 | #define STTS424E_DEVID_MASK 0xfffe | |
149 | ||
4de86126 JD |
150 | #define STTS2002_DEVID 0x0300 |
151 | #define STTS2002_DEVID_MASK 0xffff | |
152 | ||
175c490c GR |
153 | #define STTS2004_DEVID 0x2201 |
154 | #define STTS2004_DEVID_MASK 0xffff | |
155 | ||
4de86126 JD |
156 | #define STTS3000_DEVID 0x0200 |
157 | #define STTS3000_DEVID_MASK 0xffff | |
158 | ||
4453d736 GR |
159 | static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 }; |
160 | ||
161 | struct jc42_chips { | |
162 | u16 manid; | |
163 | u16 devid; | |
164 | u16 devid_mask; | |
165 | }; | |
166 | ||
167 | static struct jc42_chips jc42_chips[] = { | |
168 | { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK }, | |
1bd612a2 | 169 | { ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK }, |
175c490c | 170 | { ATMEL_MANID2, AT30TSE004_DEVID, AT30TSE004_DEVID_MASK }, |
568003ce GR |
171 | { GT_MANID, GT30TS00_DEVID, GT30TS00_DEVID_MASK }, |
172 | { GT_MANID2, GT34TS02_DEVID, GT34TS02_DEVID_MASK }, | |
0ea2f1db GR |
173 | { IDT_MANID, TSE2004_DEVID, TSE2004_DEVID_MASK }, |
174 | { IDT_MANID, TS3000_DEVID, TS3000_DEVID_MASK }, | |
175 | { IDT_MANID, TS3001_DEVID, TS3001_DEVID_MASK }, | |
4453d736 | 176 | { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK }, |
1bd612a2 | 177 | { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK }, |
a31887dc | 178 | { MCP_MANID, MCP9808_DEVID, MCP9808_DEVID_MASK }, |
4453d736 GR |
179 | { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK }, |
180 | { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK }, | |
d4768280 | 181 | { MCP_MANID, MCP98244_DEVID, MCP98244_DEVID_MASK }, |
4453d736 GR |
182 | { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK }, |
183 | { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK }, | |
184 | { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK }, | |
99b981b2 | 185 | { ONS_MANID, CAT34TS02C_DEVID, CAT34TS02C_DEVID_MASK }, |
568003ce | 186 | { ONS_MANID, CAT34TS04_DEVID, CAT34TS04_DEVID_MASK }, |
bf4d8430 | 187 | { ONS_MANID, N34TS04_DEVID, N34TS04_DEVID_MASK }, |
4453d736 GR |
188 | { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK }, |
189 | { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK }, | |
190 | { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK }, | |
4de86126 | 191 | { STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK }, |
175c490c | 192 | { STM_MANID, STTS2004_DEVID, STTS2004_DEVID_MASK }, |
4de86126 | 193 | { STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK }, |
4453d736 GR |
194 | }; |
195 | ||
10192bc6 GR |
196 | enum temp_index { |
197 | t_input = 0, | |
198 | t_crit, | |
199 | t_min, | |
200 | t_max, | |
201 | t_num_temp | |
202 | }; | |
203 | ||
204 | static const u8 temp_regs[t_num_temp] = { | |
205 | [t_input] = JC42_REG_TEMP, | |
206 | [t_crit] = JC42_REG_TEMP_CRITICAL, | |
207 | [t_min] = JC42_REG_TEMP_LOWER, | |
208 | [t_max] = JC42_REG_TEMP_UPPER, | |
209 | }; | |
210 | ||
4453d736 GR |
211 | /* Each client has this additional data */ |
212 | struct jc42_data { | |
62f9a57c | 213 | struct i2c_client *client; |
4453d736 GR |
214 | struct mutex update_lock; /* protect register access */ |
215 | bool extended; /* true if extended range supported */ | |
216 | bool valid; | |
217 | unsigned long last_updated; /* In jiffies */ | |
218 | u16 orig_config; /* original configuration */ | |
219 | u16 config; /* current configuration */ | |
10192bc6 | 220 | u16 temp[t_num_temp];/* Temperatures */ |
4453d736 GR |
221 | }; |
222 | ||
4453d736 GR |
223 | #define JC42_TEMP_MIN_EXTENDED (-40000) |
224 | #define JC42_TEMP_MIN 0 | |
225 | #define JC42_TEMP_MAX 125000 | |
226 | ||
3a05633b | 227 | static u16 jc42_temp_to_reg(long temp, bool extended) |
4453d736 | 228 | { |
2a844c14 GR |
229 | int ntemp = clamp_val(temp, |
230 | extended ? JC42_TEMP_MIN_EXTENDED : | |
231 | JC42_TEMP_MIN, JC42_TEMP_MAX); | |
4453d736 GR |
232 | |
233 | /* convert from 0.001 to 0.0625 resolution */ | |
234 | return (ntemp * 2 / 125) & 0x1fff; | |
235 | } | |
236 | ||
237 | static int jc42_temp_from_reg(s16 reg) | |
238 | { | |
bca6a1ad | 239 | reg = sign_extend32(reg, 12); |
4453d736 GR |
240 | |
241 | /* convert from 0.0625 to 0.001 resolution */ | |
242 | return reg * 125 / 2; | |
243 | } | |
244 | ||
d397276b GR |
245 | static struct jc42_data *jc42_update_device(struct device *dev) |
246 | { | |
247 | struct jc42_data *data = dev_get_drvdata(dev); | |
248 | struct i2c_client *client = data->client; | |
249 | struct jc42_data *ret = data; | |
10192bc6 | 250 | int i, val; |
d397276b GR |
251 | |
252 | mutex_lock(&data->update_lock); | |
253 | ||
254 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
10192bc6 GR |
255 | for (i = 0; i < t_num_temp; i++) { |
256 | val = i2c_smbus_read_word_swapped(client, temp_regs[i]); | |
257 | if (val < 0) { | |
258 | ret = ERR_PTR(val); | |
259 | goto abort; | |
260 | } | |
261 | data->temp[i] = val; | |
d397276b | 262 | } |
d397276b GR |
263 | data->last_updated = jiffies; |
264 | data->valid = true; | |
265 | } | |
266 | abort: | |
267 | mutex_unlock(&data->update_lock); | |
268 | return ret; | |
269 | } | |
270 | ||
fcc448cf GR |
271 | static int jc42_read(struct device *dev, enum hwmon_sensor_types type, |
272 | u32 attr, int channel, long *val) | |
4453d736 GR |
273 | { |
274 | struct jc42_data *data = jc42_update_device(dev); | |
275 | int temp, hyst; | |
276 | ||
277 | if (IS_ERR(data)) | |
278 | return PTR_ERR(data); | |
279 | ||
fcc448cf GR |
280 | switch (attr) { |
281 | case hwmon_temp_input: | |
282 | *val = jc42_temp_from_reg(data->temp[t_input]); | |
283 | return 0; | |
284 | case hwmon_temp_min: | |
285 | *val = jc42_temp_from_reg(data->temp[t_min]); | |
286 | return 0; | |
287 | case hwmon_temp_max: | |
288 | *val = jc42_temp_from_reg(data->temp[t_max]); | |
289 | return 0; | |
290 | case hwmon_temp_crit: | |
291 | *val = jc42_temp_from_reg(data->temp[t_crit]); | |
292 | return 0; | |
293 | case hwmon_temp_max_hyst: | |
294 | temp = jc42_temp_from_reg(data->temp[t_max]); | |
295 | hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK) | |
296 | >> JC42_CFG_HYST_SHIFT]; | |
297 | *val = temp - hyst; | |
298 | return 0; | |
299 | case hwmon_temp_crit_hyst: | |
300 | temp = jc42_temp_from_reg(data->temp[t_crit]); | |
301 | hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK) | |
302 | >> JC42_CFG_HYST_SHIFT]; | |
303 | *val = temp - hyst; | |
304 | return 0; | |
305 | case hwmon_temp_min_alarm: | |
306 | *val = (data->temp[t_input] >> JC42_ALARM_MIN_BIT) & 1; | |
307 | return 0; | |
308 | case hwmon_temp_max_alarm: | |
309 | *val = (data->temp[t_input] >> JC42_ALARM_MAX_BIT) & 1; | |
310 | return 0; | |
311 | case hwmon_temp_crit_alarm: | |
312 | *val = (data->temp[t_input] >> JC42_ALARM_CRIT_BIT) & 1; | |
313 | return 0; | |
314 | default: | |
315 | return -EOPNOTSUPP; | |
316 | } | |
4453d736 GR |
317 | } |
318 | ||
fcc448cf GR |
319 | static int jc42_write(struct device *dev, enum hwmon_sensor_types type, |
320 | u32 attr, int channel, long val) | |
10192bc6 | 321 | { |
10192bc6 | 322 | struct jc42_data *data = dev_get_drvdata(dev); |
fcc448cf GR |
323 | struct i2c_client *client = data->client; |
324 | int diff, hyst; | |
325 | int ret; | |
4453d736 | 326 | |
10192bc6 | 327 | mutex_lock(&data->update_lock); |
4453d736 | 328 | |
fcc448cf GR |
329 | switch (attr) { |
330 | case hwmon_temp_min: | |
331 | data->temp[t_min] = jc42_temp_to_reg(val, data->extended); | |
332 | ret = i2c_smbus_write_word_swapped(client, temp_regs[t_min], | |
333 | data->temp[t_min]); | |
334 | break; | |
335 | case hwmon_temp_max: | |
336 | data->temp[t_max] = jc42_temp_to_reg(val, data->extended); | |
337 | ret = i2c_smbus_write_word_swapped(client, temp_regs[t_max], | |
338 | data->temp[t_max]); | |
339 | break; | |
340 | case hwmon_temp_crit: | |
341 | data->temp[t_crit] = jc42_temp_to_reg(val, data->extended); | |
342 | ret = i2c_smbus_write_word_swapped(client, temp_regs[t_crit], | |
343 | data->temp[t_crit]); | |
344 | break; | |
345 | case hwmon_temp_crit_hyst: | |
346 | /* | |
347 | * JC42.4 compliant chips only support four hysteresis values. | |
348 | * Pick best choice and go from there. | |
349 | */ | |
350 | val = clamp_val(val, (data->extended ? JC42_TEMP_MIN_EXTENDED | |
351 | : JC42_TEMP_MIN) - 6000, | |
352 | JC42_TEMP_MAX); | |
353 | diff = jc42_temp_from_reg(data->temp[t_crit]) - val; | |
354 | hyst = 0; | |
355 | if (diff > 0) { | |
356 | if (diff < 2250) | |
357 | hyst = 1; /* 1.5 degrees C */ | |
358 | else if (diff < 4500) | |
359 | hyst = 2; /* 3.0 degrees C */ | |
360 | else | |
361 | hyst = 3; /* 6.0 degrees C */ | |
362 | } | |
363 | data->config = (data->config & ~JC42_CFG_HYST_MASK) | | |
364 | (hyst << JC42_CFG_HYST_SHIFT); | |
365 | ret = i2c_smbus_write_word_swapped(data->client, | |
366 | JC42_REG_CONFIG, | |
367 | data->config); | |
368 | break; | |
369 | default: | |
370 | ret = -EOPNOTSUPP; | |
371 | break; | |
4453d736 GR |
372 | } |
373 | ||
4453d736 | 374 | mutex_unlock(&data->update_lock); |
4453d736 | 375 | |
fcc448cf | 376 | return ret; |
4453d736 GR |
377 | } |
378 | ||
fcc448cf GR |
379 | static umode_t jc42_is_visible(const void *_data, enum hwmon_sensor_types type, |
380 | u32 attr, int channel) | |
2c6315da | 381 | { |
fcc448cf | 382 | const struct jc42_data *data = _data; |
2c6315da | 383 | unsigned int config = data->config; |
4820d511 | 384 | umode_t mode = 0444; |
fcc448cf GR |
385 | |
386 | switch (attr) { | |
387 | case hwmon_temp_min: | |
388 | case hwmon_temp_max: | |
389 | if (!(config & JC42_CFG_EVENT_LOCK)) | |
4820d511 | 390 | mode |= 0200; |
fcc448cf GR |
391 | break; |
392 | case hwmon_temp_crit: | |
393 | if (!(config & JC42_CFG_TCRIT_LOCK)) | |
4820d511 | 394 | mode |= 0200; |
fcc448cf GR |
395 | break; |
396 | case hwmon_temp_crit_hyst: | |
397 | if (!(config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK))) | |
4820d511 | 398 | mode |= 0200; |
fcc448cf GR |
399 | break; |
400 | case hwmon_temp_input: | |
401 | case hwmon_temp_max_hyst: | |
402 | case hwmon_temp_min_alarm: | |
403 | case hwmon_temp_max_alarm: | |
404 | case hwmon_temp_crit_alarm: | |
405 | break; | |
406 | default: | |
407 | mode = 0; | |
408 | break; | |
409 | } | |
410 | return mode; | |
2c6315da CL |
411 | } |
412 | ||
4453d736 | 413 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
f15df57d | 414 | static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info) |
4453d736 | 415 | { |
f15df57d | 416 | struct i2c_adapter *adapter = client->adapter; |
4453d736 GR |
417 | int i, config, cap, manid, devid; |
418 | ||
419 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
420 | I2C_FUNC_SMBUS_WORD_DATA)) | |
421 | return -ENODEV; | |
422 | ||
f15df57d GR |
423 | cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP); |
424 | config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG); | |
425 | manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID); | |
426 | devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID); | |
4453d736 GR |
427 | |
428 | if (cap < 0 || config < 0 || manid < 0 || devid < 0) | |
429 | return -ENODEV; | |
430 | ||
431 | if ((cap & 0xff00) || (config & 0xf800)) | |
432 | return -ENODEV; | |
433 | ||
434 | for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) { | |
435 | struct jc42_chips *chip = &jc42_chips[i]; | |
436 | if (manid == chip->manid && | |
437 | (devid & chip->devid_mask) == chip->devid) { | |
438 | strlcpy(info->type, "jc42", I2C_NAME_SIZE); | |
439 | return 0; | |
440 | } | |
441 | } | |
442 | return -ENODEV; | |
443 | } | |
444 | ||
fcc448cf | 445 | static const struct hwmon_channel_info *jc42_info[] = { |
1eade10f GR |
446 | HWMON_CHANNEL_INFO(temp, |
447 | HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | | |
448 | HWMON_T_CRIT | HWMON_T_MAX_HYST | | |
449 | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | | |
450 | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM), | |
fcc448cf GR |
451 | NULL |
452 | }; | |
453 | ||
454 | static const struct hwmon_ops jc42_hwmon_ops = { | |
455 | .is_visible = jc42_is_visible, | |
456 | .read = jc42_read, | |
457 | .write = jc42_write, | |
458 | }; | |
459 | ||
460 | static const struct hwmon_chip_info jc42_chip_info = { | |
461 | .ops = &jc42_hwmon_ops, | |
462 | .info = jc42_info, | |
463 | }; | |
464 | ||
67487038 | 465 | static int jc42_probe(struct i2c_client *client) |
4453d736 | 466 | { |
f15df57d | 467 | struct device *dev = &client->dev; |
62f9a57c GR |
468 | struct device *hwmon_dev; |
469 | struct jc42_data *data; | |
470 | int config, cap; | |
4453d736 | 471 | |
f15df57d GR |
472 | data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL); |
473 | if (!data) | |
474 | return -ENOMEM; | |
4453d736 | 475 | |
62f9a57c | 476 | data->client = client; |
f15df57d | 477 | i2c_set_clientdata(client, data); |
4453d736 GR |
478 | mutex_init(&data->update_lock); |
479 | ||
f15df57d GR |
480 | cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP); |
481 | if (cap < 0) | |
482 | return cap; | |
483 | ||
4453d736 GR |
484 | data->extended = !!(cap & JC42_CAP_RANGE); |
485 | ||
68615eb0 PR |
486 | if (device_property_read_bool(dev, "smbus-timeout-disable")) { |
487 | int smbus; | |
488 | ||
489 | /* | |
490 | * Not all chips support this register, but from a | |
491 | * quick read of various datasheets no chip appears | |
492 | * incompatible with the below attempt to disable | |
493 | * the timeout. And the whole thing is opt-in... | |
494 | */ | |
495 | smbus = i2c_smbus_read_word_swapped(client, JC42_REG_SMBUS); | |
496 | if (smbus < 0) | |
497 | return smbus; | |
498 | i2c_smbus_write_word_swapped(client, JC42_REG_SMBUS, | |
499 | smbus | SMBUS_STMOUT); | |
500 | } | |
501 | ||
f15df57d GR |
502 | config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG); |
503 | if (config < 0) | |
504 | return config; | |
505 | ||
4453d736 GR |
506 | data->orig_config = config; |
507 | if (config & JC42_CFG_SHUTDOWN) { | |
508 | config &= ~JC42_CFG_SHUTDOWN; | |
f15df57d | 509 | i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config); |
4453d736 GR |
510 | } |
511 | data->config = config; | |
512 | ||
c843b382 | 513 | hwmon_dev = devm_hwmon_device_register_with_info(dev, "jc42", |
fcc448cf GR |
514 | data, &jc42_chip_info, |
515 | NULL); | |
650a2c02 | 516 | return PTR_ERR_OR_ZERO(hwmon_dev); |
4453d736 GR |
517 | } |
518 | ||
519 | static int jc42_remove(struct i2c_client *client) | |
520 | { | |
521 | struct jc42_data *data = i2c_get_clientdata(client); | |
5953e276 JD |
522 | |
523 | /* Restore original configuration except hysteresis */ | |
524 | if ((data->config & ~JC42_CFG_HYST_MASK) != | |
525 | (data->orig_config & ~JC42_CFG_HYST_MASK)) { | |
526 | int config; | |
527 | ||
528 | config = (data->orig_config & ~JC42_CFG_HYST_MASK) | |
529 | | (data->config & JC42_CFG_HYST_MASK); | |
530 | i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config); | |
531 | } | |
4453d736 GR |
532 | return 0; |
533 | } | |
534 | ||
d397276b GR |
535 | #ifdef CONFIG_PM |
536 | ||
537 | static int jc42_suspend(struct device *dev) | |
4453d736 | 538 | { |
62f9a57c | 539 | struct jc42_data *data = dev_get_drvdata(dev); |
4453d736 | 540 | |
d397276b GR |
541 | data->config |= JC42_CFG_SHUTDOWN; |
542 | i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG, | |
543 | data->config); | |
544 | return 0; | |
545 | } | |
4453d736 | 546 | |
d397276b GR |
547 | static int jc42_resume(struct device *dev) |
548 | { | |
549 | struct jc42_data *data = dev_get_drvdata(dev); | |
4453d736 | 550 | |
d397276b GR |
551 | data->config &= ~JC42_CFG_SHUTDOWN; |
552 | i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG, | |
553 | data->config); | |
554 | return 0; | |
555 | } | |
4453d736 | 556 | |
d397276b GR |
557 | static const struct dev_pm_ops jc42_dev_pm_ops = { |
558 | .suspend = jc42_suspend, | |
559 | .resume = jc42_resume, | |
560 | }; | |
4453d736 | 561 | |
d397276b GR |
562 | #define JC42_DEV_PM_OPS (&jc42_dev_pm_ops) |
563 | #else | |
564 | #define JC42_DEV_PM_OPS NULL | |
565 | #endif /* CONFIG_PM */ | |
4453d736 | 566 | |
d397276b GR |
567 | static const struct i2c_device_id jc42_id[] = { |
568 | { "jc42", 0 }, | |
569 | { } | |
570 | }; | |
571 | MODULE_DEVICE_TABLE(i2c, jc42_id); | |
572 | ||
803decce GR |
573 | #ifdef CONFIG_OF |
574 | static const struct of_device_id jc42_of_ids[] = { | |
575 | { .compatible = "jedec,jc-42.4-temp", }, | |
576 | { } | |
577 | }; | |
578 | MODULE_DEVICE_TABLE(of, jc42_of_ids); | |
579 | #endif | |
580 | ||
d397276b | 581 | static struct i2c_driver jc42_driver = { |
eacc48ce | 582 | .class = I2C_CLASS_SPD | I2C_CLASS_HWMON, |
d397276b GR |
583 | .driver = { |
584 | .name = "jc42", | |
585 | .pm = JC42_DEV_PM_OPS, | |
803decce | 586 | .of_match_table = of_match_ptr(jc42_of_ids), |
d397276b | 587 | }, |
67487038 | 588 | .probe_new = jc42_probe, |
d397276b GR |
589 | .remove = jc42_remove, |
590 | .id_table = jc42_id, | |
591 | .detect = jc42_detect, | |
592 | .address_list = normal_i2c, | |
593 | }; | |
4453d736 | 594 | |
f0967eea | 595 | module_i2c_driver(jc42_driver); |
4453d736 | 596 | |
bb9a80e5 | 597 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); |
4453d736 GR |
598 | MODULE_DESCRIPTION("JC42 driver"); |
599 | MODULE_LICENSE("GPL"); |