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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 | ||
4453d736 GR |
140 | /* ST Microelectronics */ |
141 | #define STTS424_DEVID 0x0101 | |
142 | #define STTS424_DEVID_MASK 0xffff | |
143 | ||
144 | #define STTS424E_DEVID 0x0000 | |
145 | #define STTS424E_DEVID_MASK 0xfffe | |
146 | ||
4de86126 JD |
147 | #define STTS2002_DEVID 0x0300 |
148 | #define STTS2002_DEVID_MASK 0xffff | |
149 | ||
175c490c GR |
150 | #define STTS2004_DEVID 0x2201 |
151 | #define STTS2004_DEVID_MASK 0xffff | |
152 | ||
4de86126 JD |
153 | #define STTS3000_DEVID 0x0200 |
154 | #define STTS3000_DEVID_MASK 0xffff | |
155 | ||
4453d736 GR |
156 | static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 }; |
157 | ||
158 | struct jc42_chips { | |
159 | u16 manid; | |
160 | u16 devid; | |
161 | u16 devid_mask; | |
162 | }; | |
163 | ||
164 | static struct jc42_chips jc42_chips[] = { | |
165 | { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK }, | |
1bd612a2 | 166 | { ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK }, |
175c490c | 167 | { ATMEL_MANID2, AT30TSE004_DEVID, AT30TSE004_DEVID_MASK }, |
568003ce GR |
168 | { GT_MANID, GT30TS00_DEVID, GT30TS00_DEVID_MASK }, |
169 | { GT_MANID2, GT34TS02_DEVID, GT34TS02_DEVID_MASK }, | |
0ea2f1db GR |
170 | { IDT_MANID, TSE2004_DEVID, TSE2004_DEVID_MASK }, |
171 | { IDT_MANID, TS3000_DEVID, TS3000_DEVID_MASK }, | |
172 | { IDT_MANID, TS3001_DEVID, TS3001_DEVID_MASK }, | |
4453d736 | 173 | { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK }, |
1bd612a2 | 174 | { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK }, |
a31887dc | 175 | { MCP_MANID, MCP9808_DEVID, MCP9808_DEVID_MASK }, |
4453d736 GR |
176 | { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK }, |
177 | { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK }, | |
d4768280 | 178 | { MCP_MANID, MCP98244_DEVID, MCP98244_DEVID_MASK }, |
4453d736 GR |
179 | { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK }, |
180 | { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK }, | |
181 | { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK }, | |
99b981b2 | 182 | { ONS_MANID, CAT34TS02C_DEVID, CAT34TS02C_DEVID_MASK }, |
568003ce | 183 | { ONS_MANID, CAT34TS04_DEVID, CAT34TS04_DEVID_MASK }, |
4453d736 GR |
184 | { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK }, |
185 | { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK }, | |
186 | { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK }, | |
4de86126 | 187 | { STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK }, |
175c490c | 188 | { STM_MANID, STTS2004_DEVID, STTS2004_DEVID_MASK }, |
4de86126 | 189 | { STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK }, |
4453d736 GR |
190 | }; |
191 | ||
10192bc6 GR |
192 | enum temp_index { |
193 | t_input = 0, | |
194 | t_crit, | |
195 | t_min, | |
196 | t_max, | |
197 | t_num_temp | |
198 | }; | |
199 | ||
200 | static const u8 temp_regs[t_num_temp] = { | |
201 | [t_input] = JC42_REG_TEMP, | |
202 | [t_crit] = JC42_REG_TEMP_CRITICAL, | |
203 | [t_min] = JC42_REG_TEMP_LOWER, | |
204 | [t_max] = JC42_REG_TEMP_UPPER, | |
205 | }; | |
206 | ||
4453d736 GR |
207 | /* Each client has this additional data */ |
208 | struct jc42_data { | |
62f9a57c | 209 | struct i2c_client *client; |
4453d736 GR |
210 | struct mutex update_lock; /* protect register access */ |
211 | bool extended; /* true if extended range supported */ | |
212 | bool valid; | |
213 | unsigned long last_updated; /* In jiffies */ | |
214 | u16 orig_config; /* original configuration */ | |
215 | u16 config; /* current configuration */ | |
10192bc6 | 216 | u16 temp[t_num_temp];/* Temperatures */ |
4453d736 GR |
217 | }; |
218 | ||
4453d736 GR |
219 | #define JC42_TEMP_MIN_EXTENDED (-40000) |
220 | #define JC42_TEMP_MIN 0 | |
221 | #define JC42_TEMP_MAX 125000 | |
222 | ||
3a05633b | 223 | static u16 jc42_temp_to_reg(long temp, bool extended) |
4453d736 | 224 | { |
2a844c14 GR |
225 | int ntemp = clamp_val(temp, |
226 | extended ? JC42_TEMP_MIN_EXTENDED : | |
227 | JC42_TEMP_MIN, JC42_TEMP_MAX); | |
4453d736 GR |
228 | |
229 | /* convert from 0.001 to 0.0625 resolution */ | |
230 | return (ntemp * 2 / 125) & 0x1fff; | |
231 | } | |
232 | ||
233 | static int jc42_temp_from_reg(s16 reg) | |
234 | { | |
bca6a1ad | 235 | reg = sign_extend32(reg, 12); |
4453d736 GR |
236 | |
237 | /* convert from 0.0625 to 0.001 resolution */ | |
238 | return reg * 125 / 2; | |
239 | } | |
240 | ||
d397276b GR |
241 | static struct jc42_data *jc42_update_device(struct device *dev) |
242 | { | |
243 | struct jc42_data *data = dev_get_drvdata(dev); | |
244 | struct i2c_client *client = data->client; | |
245 | struct jc42_data *ret = data; | |
10192bc6 | 246 | int i, val; |
d397276b GR |
247 | |
248 | mutex_lock(&data->update_lock); | |
249 | ||
250 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
10192bc6 GR |
251 | for (i = 0; i < t_num_temp; i++) { |
252 | val = i2c_smbus_read_word_swapped(client, temp_regs[i]); | |
253 | if (val < 0) { | |
254 | ret = ERR_PTR(val); | |
255 | goto abort; | |
256 | } | |
257 | data->temp[i] = val; | |
d397276b | 258 | } |
d397276b GR |
259 | data->last_updated = jiffies; |
260 | data->valid = true; | |
261 | } | |
262 | abort: | |
263 | mutex_unlock(&data->update_lock); | |
264 | return ret; | |
265 | } | |
266 | ||
fcc448cf GR |
267 | static int jc42_read(struct device *dev, enum hwmon_sensor_types type, |
268 | u32 attr, int channel, long *val) | |
4453d736 GR |
269 | { |
270 | struct jc42_data *data = jc42_update_device(dev); | |
271 | int temp, hyst; | |
272 | ||
273 | if (IS_ERR(data)) | |
274 | return PTR_ERR(data); | |
275 | ||
fcc448cf GR |
276 | switch (attr) { |
277 | case hwmon_temp_input: | |
278 | *val = jc42_temp_from_reg(data->temp[t_input]); | |
279 | return 0; | |
280 | case hwmon_temp_min: | |
281 | *val = jc42_temp_from_reg(data->temp[t_min]); | |
282 | return 0; | |
283 | case hwmon_temp_max: | |
284 | *val = jc42_temp_from_reg(data->temp[t_max]); | |
285 | return 0; | |
286 | case hwmon_temp_crit: | |
287 | *val = jc42_temp_from_reg(data->temp[t_crit]); | |
288 | return 0; | |
289 | case hwmon_temp_max_hyst: | |
290 | temp = jc42_temp_from_reg(data->temp[t_max]); | |
291 | hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK) | |
292 | >> JC42_CFG_HYST_SHIFT]; | |
293 | *val = temp - hyst; | |
294 | return 0; | |
295 | case hwmon_temp_crit_hyst: | |
296 | temp = jc42_temp_from_reg(data->temp[t_crit]); | |
297 | hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK) | |
298 | >> JC42_CFG_HYST_SHIFT]; | |
299 | *val = temp - hyst; | |
300 | return 0; | |
301 | case hwmon_temp_min_alarm: | |
302 | *val = (data->temp[t_input] >> JC42_ALARM_MIN_BIT) & 1; | |
303 | return 0; | |
304 | case hwmon_temp_max_alarm: | |
305 | *val = (data->temp[t_input] >> JC42_ALARM_MAX_BIT) & 1; | |
306 | return 0; | |
307 | case hwmon_temp_crit_alarm: | |
308 | *val = (data->temp[t_input] >> JC42_ALARM_CRIT_BIT) & 1; | |
309 | return 0; | |
310 | default: | |
311 | return -EOPNOTSUPP; | |
312 | } | |
4453d736 GR |
313 | } |
314 | ||
fcc448cf GR |
315 | static int jc42_write(struct device *dev, enum hwmon_sensor_types type, |
316 | u32 attr, int channel, long val) | |
10192bc6 | 317 | { |
10192bc6 | 318 | struct jc42_data *data = dev_get_drvdata(dev); |
fcc448cf GR |
319 | struct i2c_client *client = data->client; |
320 | int diff, hyst; | |
321 | int ret; | |
4453d736 | 322 | |
10192bc6 | 323 | mutex_lock(&data->update_lock); |
4453d736 | 324 | |
fcc448cf GR |
325 | switch (attr) { |
326 | case hwmon_temp_min: | |
327 | data->temp[t_min] = jc42_temp_to_reg(val, data->extended); | |
328 | ret = i2c_smbus_write_word_swapped(client, temp_regs[t_min], | |
329 | data->temp[t_min]); | |
330 | break; | |
331 | case hwmon_temp_max: | |
332 | data->temp[t_max] = jc42_temp_to_reg(val, data->extended); | |
333 | ret = i2c_smbus_write_word_swapped(client, temp_regs[t_max], | |
334 | data->temp[t_max]); | |
335 | break; | |
336 | case hwmon_temp_crit: | |
337 | data->temp[t_crit] = jc42_temp_to_reg(val, data->extended); | |
338 | ret = i2c_smbus_write_word_swapped(client, temp_regs[t_crit], | |
339 | data->temp[t_crit]); | |
340 | break; | |
341 | case hwmon_temp_crit_hyst: | |
342 | /* | |
343 | * JC42.4 compliant chips only support four hysteresis values. | |
344 | * Pick best choice and go from there. | |
345 | */ | |
346 | val = clamp_val(val, (data->extended ? JC42_TEMP_MIN_EXTENDED | |
347 | : JC42_TEMP_MIN) - 6000, | |
348 | JC42_TEMP_MAX); | |
349 | diff = jc42_temp_from_reg(data->temp[t_crit]) - val; | |
350 | hyst = 0; | |
351 | if (diff > 0) { | |
352 | if (diff < 2250) | |
353 | hyst = 1; /* 1.5 degrees C */ | |
354 | else if (diff < 4500) | |
355 | hyst = 2; /* 3.0 degrees C */ | |
356 | else | |
357 | hyst = 3; /* 6.0 degrees C */ | |
358 | } | |
359 | data->config = (data->config & ~JC42_CFG_HYST_MASK) | | |
360 | (hyst << JC42_CFG_HYST_SHIFT); | |
361 | ret = i2c_smbus_write_word_swapped(data->client, | |
362 | JC42_REG_CONFIG, | |
363 | data->config); | |
364 | break; | |
365 | default: | |
366 | ret = -EOPNOTSUPP; | |
367 | break; | |
4453d736 GR |
368 | } |
369 | ||
4453d736 | 370 | mutex_unlock(&data->update_lock); |
4453d736 | 371 | |
fcc448cf | 372 | return ret; |
4453d736 GR |
373 | } |
374 | ||
fcc448cf GR |
375 | static umode_t jc42_is_visible(const void *_data, enum hwmon_sensor_types type, |
376 | u32 attr, int channel) | |
2c6315da | 377 | { |
fcc448cf | 378 | const struct jc42_data *data = _data; |
2c6315da | 379 | unsigned int config = data->config; |
4820d511 | 380 | umode_t mode = 0444; |
fcc448cf GR |
381 | |
382 | switch (attr) { | |
383 | case hwmon_temp_min: | |
384 | case hwmon_temp_max: | |
385 | if (!(config & JC42_CFG_EVENT_LOCK)) | |
4820d511 | 386 | mode |= 0200; |
fcc448cf GR |
387 | break; |
388 | case hwmon_temp_crit: | |
389 | if (!(config & JC42_CFG_TCRIT_LOCK)) | |
4820d511 | 390 | mode |= 0200; |
fcc448cf GR |
391 | break; |
392 | case hwmon_temp_crit_hyst: | |
393 | if (!(config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK))) | |
4820d511 | 394 | mode |= 0200; |
fcc448cf GR |
395 | break; |
396 | case hwmon_temp_input: | |
397 | case hwmon_temp_max_hyst: | |
398 | case hwmon_temp_min_alarm: | |
399 | case hwmon_temp_max_alarm: | |
400 | case hwmon_temp_crit_alarm: | |
401 | break; | |
402 | default: | |
403 | mode = 0; | |
404 | break; | |
405 | } | |
406 | return mode; | |
2c6315da CL |
407 | } |
408 | ||
4453d736 | 409 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
f15df57d | 410 | static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info) |
4453d736 | 411 | { |
f15df57d | 412 | struct i2c_adapter *adapter = client->adapter; |
4453d736 GR |
413 | int i, config, cap, manid, devid; |
414 | ||
415 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
416 | I2C_FUNC_SMBUS_WORD_DATA)) | |
417 | return -ENODEV; | |
418 | ||
f15df57d GR |
419 | cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP); |
420 | config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG); | |
421 | manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID); | |
422 | devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID); | |
4453d736 GR |
423 | |
424 | if (cap < 0 || config < 0 || manid < 0 || devid < 0) | |
425 | return -ENODEV; | |
426 | ||
427 | if ((cap & 0xff00) || (config & 0xf800)) | |
428 | return -ENODEV; | |
429 | ||
430 | for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) { | |
431 | struct jc42_chips *chip = &jc42_chips[i]; | |
432 | if (manid == chip->manid && | |
433 | (devid & chip->devid_mask) == chip->devid) { | |
434 | strlcpy(info->type, "jc42", I2C_NAME_SIZE); | |
435 | return 0; | |
436 | } | |
437 | } | |
438 | return -ENODEV; | |
439 | } | |
440 | ||
fcc448cf | 441 | static const struct hwmon_channel_info *jc42_info[] = { |
1eade10f GR |
442 | HWMON_CHANNEL_INFO(temp, |
443 | HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | | |
444 | HWMON_T_CRIT | HWMON_T_MAX_HYST | | |
445 | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | | |
446 | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM), | |
fcc448cf GR |
447 | NULL |
448 | }; | |
449 | ||
450 | static const struct hwmon_ops jc42_hwmon_ops = { | |
451 | .is_visible = jc42_is_visible, | |
452 | .read = jc42_read, | |
453 | .write = jc42_write, | |
454 | }; | |
455 | ||
456 | static const struct hwmon_chip_info jc42_chip_info = { | |
457 | .ops = &jc42_hwmon_ops, | |
458 | .info = jc42_info, | |
459 | }; | |
460 | ||
67487038 | 461 | static int jc42_probe(struct i2c_client *client) |
4453d736 | 462 | { |
f15df57d | 463 | struct device *dev = &client->dev; |
62f9a57c GR |
464 | struct device *hwmon_dev; |
465 | struct jc42_data *data; | |
466 | int config, cap; | |
4453d736 | 467 | |
f15df57d GR |
468 | data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL); |
469 | if (!data) | |
470 | return -ENOMEM; | |
4453d736 | 471 | |
62f9a57c | 472 | data->client = client; |
f15df57d | 473 | i2c_set_clientdata(client, data); |
4453d736 GR |
474 | mutex_init(&data->update_lock); |
475 | ||
f15df57d GR |
476 | cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP); |
477 | if (cap < 0) | |
478 | return cap; | |
479 | ||
4453d736 GR |
480 | data->extended = !!(cap & JC42_CAP_RANGE); |
481 | ||
68615eb0 PR |
482 | if (device_property_read_bool(dev, "smbus-timeout-disable")) { |
483 | int smbus; | |
484 | ||
485 | /* | |
486 | * Not all chips support this register, but from a | |
487 | * quick read of various datasheets no chip appears | |
488 | * incompatible with the below attempt to disable | |
489 | * the timeout. And the whole thing is opt-in... | |
490 | */ | |
491 | smbus = i2c_smbus_read_word_swapped(client, JC42_REG_SMBUS); | |
492 | if (smbus < 0) | |
493 | return smbus; | |
494 | i2c_smbus_write_word_swapped(client, JC42_REG_SMBUS, | |
495 | smbus | SMBUS_STMOUT); | |
496 | } | |
497 | ||
f15df57d GR |
498 | config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG); |
499 | if (config < 0) | |
500 | return config; | |
501 | ||
4453d736 GR |
502 | data->orig_config = config; |
503 | if (config & JC42_CFG_SHUTDOWN) { | |
504 | config &= ~JC42_CFG_SHUTDOWN; | |
f15df57d | 505 | i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config); |
4453d736 GR |
506 | } |
507 | data->config = config; | |
508 | ||
c843b382 | 509 | hwmon_dev = devm_hwmon_device_register_with_info(dev, "jc42", |
fcc448cf GR |
510 | data, &jc42_chip_info, |
511 | NULL); | |
650a2c02 | 512 | return PTR_ERR_OR_ZERO(hwmon_dev); |
4453d736 GR |
513 | } |
514 | ||
515 | static int jc42_remove(struct i2c_client *client) | |
516 | { | |
517 | struct jc42_data *data = i2c_get_clientdata(client); | |
5953e276 JD |
518 | |
519 | /* Restore original configuration except hysteresis */ | |
520 | if ((data->config & ~JC42_CFG_HYST_MASK) != | |
521 | (data->orig_config & ~JC42_CFG_HYST_MASK)) { | |
522 | int config; | |
523 | ||
524 | config = (data->orig_config & ~JC42_CFG_HYST_MASK) | |
525 | | (data->config & JC42_CFG_HYST_MASK); | |
526 | i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config); | |
527 | } | |
4453d736 GR |
528 | return 0; |
529 | } | |
530 | ||
d397276b GR |
531 | #ifdef CONFIG_PM |
532 | ||
533 | static int jc42_suspend(struct device *dev) | |
4453d736 | 534 | { |
62f9a57c | 535 | struct jc42_data *data = dev_get_drvdata(dev); |
4453d736 | 536 | |
d397276b GR |
537 | data->config |= JC42_CFG_SHUTDOWN; |
538 | i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG, | |
539 | data->config); | |
540 | return 0; | |
541 | } | |
4453d736 | 542 | |
d397276b GR |
543 | static int jc42_resume(struct device *dev) |
544 | { | |
545 | struct jc42_data *data = dev_get_drvdata(dev); | |
4453d736 | 546 | |
d397276b GR |
547 | data->config &= ~JC42_CFG_SHUTDOWN; |
548 | i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG, | |
549 | data->config); | |
550 | return 0; | |
551 | } | |
4453d736 | 552 | |
d397276b GR |
553 | static const struct dev_pm_ops jc42_dev_pm_ops = { |
554 | .suspend = jc42_suspend, | |
555 | .resume = jc42_resume, | |
556 | }; | |
4453d736 | 557 | |
d397276b GR |
558 | #define JC42_DEV_PM_OPS (&jc42_dev_pm_ops) |
559 | #else | |
560 | #define JC42_DEV_PM_OPS NULL | |
561 | #endif /* CONFIG_PM */ | |
4453d736 | 562 | |
d397276b GR |
563 | static const struct i2c_device_id jc42_id[] = { |
564 | { "jc42", 0 }, | |
565 | { } | |
566 | }; | |
567 | MODULE_DEVICE_TABLE(i2c, jc42_id); | |
568 | ||
803decce GR |
569 | #ifdef CONFIG_OF |
570 | static const struct of_device_id jc42_of_ids[] = { | |
571 | { .compatible = "jedec,jc-42.4-temp", }, | |
572 | { } | |
573 | }; | |
574 | MODULE_DEVICE_TABLE(of, jc42_of_ids); | |
575 | #endif | |
576 | ||
d397276b | 577 | static struct i2c_driver jc42_driver = { |
eacc48ce | 578 | .class = I2C_CLASS_SPD | I2C_CLASS_HWMON, |
d397276b GR |
579 | .driver = { |
580 | .name = "jc42", | |
581 | .pm = JC42_DEV_PM_OPS, | |
803decce | 582 | .of_match_table = of_match_ptr(jc42_of_ids), |
d397276b | 583 | }, |
67487038 | 584 | .probe_new = jc42_probe, |
d397276b GR |
585 | .remove = jc42_remove, |
586 | .id_table = jc42_id, | |
587 | .detect = jc42_detect, | |
588 | .address_list = normal_i2c, | |
589 | }; | |
4453d736 | 590 | |
f0967eea | 591 | module_i2c_driver(jc42_driver); |
4453d736 | 592 | |
bb9a80e5 | 593 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); |
4453d736 GR |
594 | MODULE_DESCRIPTION("JC42 driver"); |
595 | MODULE_LICENSE("GPL"); |