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d84ca5b3 WS |
1 | /* |
2 | * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor) | |
3 | * | |
4 | * Copyright (C) 2008, 2010 Pengutronix | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
a95da110 | 10 | * TODO: SPI, use power-down mode for suspend?, interrupt handling? |
d84ca5b3 WS |
11 | */ |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/err.h> | |
d84ca5b3 WS |
17 | #include <linux/mutex.h> |
18 | #include <linux/jiffies.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/hwmon.h> | |
21 | #include <linux/hwmon-sysfs.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
d84ca5b3 WS |
23 | |
24 | #define ADT7411_REG_INT_TEMP_VDD_LSB 0x03 | |
25 | #define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04 | |
26 | #define ADT7411_REG_VDD_MSB 0x06 | |
27 | #define ADT7411_REG_INT_TEMP_MSB 0x07 | |
28 | #define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08 | |
29 | ||
30 | #define ADT7411_REG_CFG1 0x18 | |
31 | #define ADT7411_CFG1_START_MONITOR (1 << 0) | |
601807bb | 32 | #define ADT7411_CFG1_RESERVED_BIT1 (1 << 1) |
a95da110 | 33 | #define ADT7411_CFG1_EXT_TDM (1 << 2) |
b53893aa | 34 | #define ADT7411_CFG1_RESERVED_BIT3 (1 << 3) |
d84ca5b3 WS |
35 | |
36 | #define ADT7411_REG_CFG2 0x19 | |
37 | #define ADT7411_CFG2_DISABLE_AVG (1 << 5) | |
38 | ||
39 | #define ADT7411_REG_CFG3 0x1a | |
40 | #define ADT7411_CFG3_ADC_CLK_225 (1 << 0) | |
601807bb MW |
41 | #define ADT7411_CFG3_RESERVED_BIT1 (1 << 1) |
42 | #define ADT7411_CFG3_RESERVED_BIT2 (1 << 2) | |
43 | #define ADT7411_CFG3_RESERVED_BIT3 (1 << 3) | |
d84ca5b3 WS |
44 | #define ADT7411_CFG3_REF_VDD (1 << 4) |
45 | ||
46 | #define ADT7411_REG_DEVICE_ID 0x4d | |
47 | #define ADT7411_REG_MANUFACTURER_ID 0x4e | |
48 | ||
49 | #define ADT7411_DEVICE_ID 0x2 | |
50 | #define ADT7411_MANUFACTURER_ID 0x41 | |
51 | ||
52 | static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END }; | |
53 | ||
54 | struct adt7411_data { | |
55 | struct mutex device_lock; /* for "atomic" device accesses */ | |
23244985 | 56 | struct mutex update_lock; |
d84ca5b3 | 57 | unsigned long next_update; |
1b109c49 | 58 | long vref_cached; |
eac83cd9 | 59 | struct i2c_client *client; |
a95da110 | 60 | bool use_ext_temp; |
d84ca5b3 WS |
61 | }; |
62 | ||
63 | /* | |
64 | * When reading a register containing (up to 4) lsb, all associated | |
65 | * msb-registers get locked by the hardware. After _one_ of those msb is read, | |
66 | * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb | |
67 | * is protected here with a mutex, too. | |
68 | */ | |
69 | static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg, | |
70 | u8 msb_reg, u8 lsb_shift) | |
71 | { | |
72 | struct adt7411_data *data = i2c_get_clientdata(client); | |
73 | int val, tmp; | |
74 | ||
75 | mutex_lock(&data->device_lock); | |
76 | ||
77 | val = i2c_smbus_read_byte_data(client, lsb_reg); | |
78 | if (val < 0) | |
79 | goto exit_unlock; | |
80 | ||
81 | tmp = (val >> lsb_shift) & 3; | |
82 | val = i2c_smbus_read_byte_data(client, msb_reg); | |
83 | ||
84 | if (val >= 0) | |
85 | val = (val << 2) | tmp; | |
86 | ||
87 | exit_unlock: | |
88 | mutex_unlock(&data->device_lock); | |
89 | ||
90 | return val; | |
91 | } | |
92 | ||
93 | static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit, | |
94 | bool flag) | |
95 | { | |
96 | struct adt7411_data *data = i2c_get_clientdata(client); | |
97 | int ret, val; | |
98 | ||
99 | mutex_lock(&data->device_lock); | |
100 | ||
101 | ret = i2c_smbus_read_byte_data(client, reg); | |
102 | if (ret < 0) | |
103 | goto exit_unlock; | |
104 | ||
105 | if (flag) | |
106 | val = ret | bit; | |
107 | else | |
108 | val = ret & ~bit; | |
109 | ||
110 | ret = i2c_smbus_write_byte_data(client, reg, val); | |
111 | ||
112 | exit_unlock: | |
113 | mutex_unlock(&data->device_lock); | |
114 | return ret; | |
115 | } | |
116 | ||
d84ca5b3 WS |
117 | static ssize_t adt7411_show_bit(struct device *dev, |
118 | struct device_attribute *attr, char *buf) | |
119 | { | |
120 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr); | |
eac83cd9 AL |
121 | struct adt7411_data *data = dev_get_drvdata(dev); |
122 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
123 | int ret = i2c_smbus_read_byte_data(client, attr2->index); |
124 | ||
125 | return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr)); | |
126 | } | |
127 | ||
128 | static ssize_t adt7411_set_bit(struct device *dev, | |
129 | struct device_attribute *attr, const char *buf, | |
130 | size_t count) | |
131 | { | |
132 | struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr); | |
eac83cd9 AL |
133 | struct adt7411_data *data = dev_get_drvdata(dev); |
134 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
135 | int ret; |
136 | unsigned long flag; | |
137 | ||
179c4fdb | 138 | ret = kstrtoul(buf, 0, &flag); |
d84ca5b3 WS |
139 | if (ret || flag > 1) |
140 | return -EINVAL; | |
141 | ||
142 | ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag); | |
143 | ||
144 | /* force update */ | |
23244985 | 145 | mutex_lock(&data->update_lock); |
d84ca5b3 | 146 | data->next_update = jiffies; |
23244985 | 147 | mutex_unlock(&data->update_lock); |
d84ca5b3 WS |
148 | |
149 | return ret < 0 ? ret : count; | |
150 | } | |
151 | ||
152 | #define ADT7411_BIT_ATTR(__name, __reg, __bit) \ | |
153 | SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \ | |
154 | adt7411_set_bit, __bit, __reg) | |
155 | ||
d84ca5b3 WS |
156 | static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG); |
157 | static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225); | |
158 | static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD); | |
159 | ||
160 | static struct attribute *adt7411_attrs[] = { | |
d84ca5b3 WS |
161 | &sensor_dev_attr_no_average.dev_attr.attr, |
162 | &sensor_dev_attr_fast_sampling.dev_attr.attr, | |
163 | &sensor_dev_attr_adc_ref_vdd.dev_attr.attr, | |
164 | NULL | |
165 | }; | |
1b109c49 | 166 | ATTRIBUTE_GROUPS(adt7411); |
d84ca5b3 | 167 | |
1b109c49 | 168 | static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val) |
a95da110 | 169 | { |
a95da110 | 170 | struct adt7411_data *data = dev_get_drvdata(dev); |
1b109c49 MW |
171 | struct i2c_client *client = data->client; |
172 | int ret; | |
a95da110 | 173 | |
1b109c49 MW |
174 | switch (attr) { |
175 | case hwmon_in_input: | |
176 | ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, | |
177 | ADT7411_REG_VDD_MSB, 2); | |
178 | if (ret < 0) | |
179 | return ret; | |
180 | *val = ret * 7000 / 1024; | |
181 | return 0; | |
182 | default: | |
183 | return -EOPNOTSUPP; | |
184 | } | |
185 | } | |
186 | ||
187 | static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel, | |
188 | long *val) | |
189 | { | |
190 | struct adt7411_data *data = dev_get_drvdata(dev); | |
191 | struct i2c_client *client = data->client; | |
a95da110 | 192 | |
1b109c49 MW |
193 | int ret; |
194 | int lsb_reg, lsb_shift; | |
195 | int nr = channel - 1; | |
196 | ||
197 | mutex_lock(&data->update_lock); | |
198 | if (time_after_eq(jiffies, data->next_update)) { | |
199 | ret = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3); | |
200 | if (ret < 0) | |
201 | goto exit_unlock; | |
202 | ||
203 | if (ret & ADT7411_CFG3_REF_VDD) { | |
204 | ret = adt7411_read_in_vdd(dev, hwmon_in_input, | |
205 | &data->vref_cached); | |
206 | if (ret < 0) | |
207 | goto exit_unlock; | |
208 | } else { | |
209 | data->vref_cached = 2250; | |
210 | } | |
211 | ||
212 | data->next_update = jiffies + HZ; | |
213 | } | |
214 | ||
215 | switch (attr) { | |
216 | case hwmon_in_input: | |
217 | lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2); | |
218 | lsb_shift = 2 * (nr & 0x03); | |
219 | ret = adt7411_read_10_bit(client, lsb_reg, | |
220 | ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, | |
221 | lsb_shift); | |
222 | if (ret < 0) | |
223 | goto exit_unlock; | |
224 | *val = ret * data->vref_cached / 1024; | |
225 | ret = 0; | |
226 | break; | |
227 | default: | |
228 | ret = -EOPNOTSUPP; | |
229 | break; | |
230 | } | |
231 | exit_unlock: | |
232 | mutex_unlock(&data->update_lock); | |
233 | return ret; | |
a95da110 MW |
234 | } |
235 | ||
1b109c49 MW |
236 | static int adt7411_read_in(struct device *dev, u32 attr, int channel, |
237 | long *val) | |
238 | { | |
239 | if (channel == 0) | |
240 | return adt7411_read_in_vdd(dev, attr, val); | |
241 | else | |
242 | return adt7411_read_in_chan(dev, attr, channel, val); | |
243 | } | |
244 | ||
245 | static int adt7411_read_temp(struct device *dev, u32 attr, int channel, | |
246 | long *val) | |
247 | { | |
248 | struct adt7411_data *data = dev_get_drvdata(dev); | |
249 | struct i2c_client *client = data->client; | |
250 | int ret, regl, regh; | |
251 | ||
252 | switch (attr) { | |
253 | case hwmon_temp_input: | |
254 | regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB : | |
255 | ADT7411_REG_INT_TEMP_VDD_LSB; | |
256 | regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB : | |
257 | ADT7411_REG_INT_TEMP_MSB; | |
258 | ret = adt7411_read_10_bit(client, regl, regh, 0); | |
259 | if (ret < 0) | |
260 | return ret; | |
261 | ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */ | |
262 | *val = ret * 250; | |
263 | return 0; | |
264 | default: | |
265 | return -EOPNOTSUPP; | |
266 | } | |
267 | } | |
268 | ||
269 | static int adt7411_read(struct device *dev, enum hwmon_sensor_types type, | |
270 | u32 attr, int channel, long *val) | |
271 | { | |
272 | switch (type) { | |
273 | case hwmon_in: | |
274 | return adt7411_read_in(dev, attr, channel, val); | |
275 | case hwmon_temp: | |
276 | return adt7411_read_temp(dev, attr, channel, val); | |
277 | default: | |
278 | return -EOPNOTSUPP; | |
279 | } | |
280 | } | |
281 | ||
282 | static umode_t adt7411_is_visible(const void *_data, | |
283 | enum hwmon_sensor_types type, | |
284 | u32 attr, int channel) | |
285 | { | |
286 | const struct adt7411_data *data = _data; | |
287 | ||
288 | switch (type) { | |
289 | case hwmon_in: | |
290 | if (channel > 0 && channel < 3) | |
291 | return data->use_ext_temp ? 0 : S_IRUGO; | |
292 | else | |
293 | return S_IRUGO; | |
294 | case hwmon_temp: | |
295 | if (channel == 1) | |
296 | return data->use_ext_temp ? S_IRUGO : 0; | |
297 | else | |
298 | return S_IRUGO; | |
299 | default: | |
300 | return 0; | |
301 | } | |
302 | } | |
d84ca5b3 WS |
303 | |
304 | static int adt7411_detect(struct i2c_client *client, | |
305 | struct i2c_board_info *info) | |
306 | { | |
307 | int val; | |
308 | ||
309 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
310 | return -ENODEV; | |
311 | ||
312 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID); | |
313 | if (val < 0 || val != ADT7411_MANUFACTURER_ID) { | |
b55f3757 GR |
314 | dev_dbg(&client->dev, |
315 | "Wrong manufacturer ID. Got %d, expected %d\n", | |
316 | val, ADT7411_MANUFACTURER_ID); | |
d84ca5b3 WS |
317 | return -ENODEV; |
318 | } | |
319 | ||
320 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID); | |
321 | if (val < 0 || val != ADT7411_DEVICE_ID) { | |
b55f3757 GR |
322 | dev_dbg(&client->dev, |
323 | "Wrong device ID. Got %d, expected %d\n", | |
324 | val, ADT7411_DEVICE_ID); | |
d84ca5b3 WS |
325 | return -ENODEV; |
326 | } | |
327 | ||
328 | strlcpy(info->type, "adt7411", I2C_NAME_SIZE); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
601807bb MW |
333 | static int adt7411_init_device(struct adt7411_data *data) |
334 | { | |
335 | int ret; | |
336 | u8 val; | |
337 | ||
338 | ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3); | |
339 | if (ret < 0) | |
340 | return ret; | |
341 | ||
342 | /* | |
343 | * We must only write zero to bit 1 and bit 2 and only one to bit 3 | |
344 | * according to the datasheet. | |
345 | */ | |
346 | val = ret; | |
347 | val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2); | |
348 | val |= ADT7411_CFG3_RESERVED_BIT3; | |
349 | ||
350 | ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val); | |
351 | if (ret < 0) | |
352 | return ret; | |
353 | ||
354 | ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1); | |
355 | if (ret < 0) | |
356 | return ret; | |
357 | ||
a95da110 MW |
358 | data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM; |
359 | ||
601807bb MW |
360 | /* |
361 | * We must only write zero to bit 1 and only one to bit 3 according to | |
362 | * the datasheet. | |
363 | */ | |
364 | val = ret; | |
365 | val &= ~ADT7411_CFG1_RESERVED_BIT1; | |
366 | val |= ADT7411_CFG1_RESERVED_BIT3; | |
367 | ||
368 | /* enable monitoring */ | |
369 | val |= ADT7411_CFG1_START_MONITOR; | |
370 | ||
371 | return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val); | |
372 | } | |
373 | ||
1b109c49 MW |
374 | static const u32 adt7411_in_config[] = { |
375 | HWMON_I_INPUT, | |
376 | HWMON_I_INPUT, | |
377 | HWMON_I_INPUT, | |
378 | HWMON_I_INPUT, | |
379 | HWMON_I_INPUT, | |
380 | HWMON_I_INPUT, | |
381 | HWMON_I_INPUT, | |
382 | HWMON_I_INPUT, | |
383 | HWMON_I_INPUT, | |
384 | 0 | |
385 | }; | |
386 | ||
387 | static const struct hwmon_channel_info adt7411_in = { | |
388 | .type = hwmon_in, | |
389 | .config = adt7411_in_config, | |
390 | }; | |
391 | ||
392 | static const u32 adt7411_temp_config[] = { | |
393 | HWMON_T_INPUT, | |
394 | HWMON_T_INPUT, | |
395 | 0 | |
396 | }; | |
397 | ||
398 | static const struct hwmon_channel_info adt7411_temp = { | |
399 | .type = hwmon_temp, | |
400 | .config = adt7411_temp_config, | |
401 | }; | |
402 | ||
403 | static const struct hwmon_channel_info *adt7411_info[] = { | |
404 | &adt7411_in, | |
405 | &adt7411_temp, | |
406 | NULL | |
407 | }; | |
408 | ||
409 | static const struct hwmon_ops adt7411_hwmon_ops = { | |
410 | .is_visible = adt7411_is_visible, | |
411 | .read = adt7411_read, | |
412 | }; | |
413 | ||
414 | static const struct hwmon_chip_info adt7411_chip_info = { | |
415 | .ops = &adt7411_hwmon_ops, | |
416 | .info = adt7411_info, | |
417 | }; | |
418 | ||
6c931ae1 | 419 | static int adt7411_probe(struct i2c_client *client, |
d84ca5b3 WS |
420 | const struct i2c_device_id *id) |
421 | { | |
eac83cd9 | 422 | struct device *dev = &client->dev; |
d84ca5b3 | 423 | struct adt7411_data *data; |
eac83cd9 | 424 | struct device *hwmon_dev; |
d84ca5b3 WS |
425 | int ret; |
426 | ||
eac83cd9 | 427 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
d84ca5b3 WS |
428 | if (!data) |
429 | return -ENOMEM; | |
430 | ||
431 | i2c_set_clientdata(client, data); | |
eac83cd9 | 432 | data->client = client; |
d84ca5b3 | 433 | mutex_init(&data->device_lock); |
23244985 | 434 | mutex_init(&data->update_lock); |
d84ca5b3 | 435 | |
601807bb | 436 | ret = adt7411_init_device(data); |
d84ca5b3 | 437 | if (ret < 0) |
65ec17b0 | 438 | return ret; |
d84ca5b3 WS |
439 | |
440 | /* force update on first occasion */ | |
441 | data->next_update = jiffies; | |
442 | ||
1b109c49 MW |
443 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
444 | data, | |
445 | &adt7411_chip_info, | |
446 | adt7411_groups); | |
eac83cd9 | 447 | return PTR_ERR_OR_ZERO(hwmon_dev); |
d84ca5b3 WS |
448 | } |
449 | ||
450 | static const struct i2c_device_id adt7411_id[] = { | |
451 | { "adt7411", 0 }, | |
452 | { } | |
453 | }; | |
a7254d68 | 454 | MODULE_DEVICE_TABLE(i2c, adt7411_id); |
d84ca5b3 WS |
455 | |
456 | static struct i2c_driver adt7411_driver = { | |
457 | .driver = { | |
458 | .name = "adt7411", | |
459 | }, | |
460 | .probe = adt7411_probe, | |
d84ca5b3 WS |
461 | .id_table = adt7411_id, |
462 | .detect = adt7411_detect, | |
463 | .address_list = normal_i2c, | |
464 | .class = I2C_CLASS_HWMON, | |
465 | }; | |
466 | ||
f0967eea | 467 | module_i2c_driver(adt7411_driver); |
d84ca5b3 WS |
468 | |
469 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and " | |
470 | "Wolfram Sang <w.sang@pengutronix.de>"); | |
471 | MODULE_DESCRIPTION("ADT7411 driver"); | |
472 | MODULE_LICENSE("GPL v2"); |