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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 WS |
57 | unsigned long next_update; |
58 | int 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 | ||
117 | static ssize_t adt7411_show_vdd(struct device *dev, | |
118 | struct device_attribute *attr, char *buf) | |
119 | { | |
eac83cd9 AL |
120 | struct adt7411_data *data = dev_get_drvdata(dev); |
121 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
122 | int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, |
123 | ADT7411_REG_VDD_MSB, 2); | |
124 | ||
125 | return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024); | |
126 | } | |
127 | ||
128 | static ssize_t adt7411_show_temp(struct device *dev, | |
129 | struct device_attribute *attr, char *buf) | |
130 | { | |
a95da110 | 131 | int nr = to_sensor_dev_attr(attr)->index; |
eac83cd9 AL |
132 | struct adt7411_data *data = dev_get_drvdata(dev); |
133 | struct i2c_client *client = data->client; | |
a95da110 MW |
134 | int val; |
135 | struct { | |
136 | u8 low; | |
137 | u8 high; | |
138 | } reg[2] = { | |
139 | { ADT7411_REG_INT_TEMP_VDD_LSB, ADT7411_REG_INT_TEMP_MSB }, | |
140 | { ADT7411_REG_EXT_TEMP_AIN14_LSB, | |
141 | ADT7411_REG_EXT_TEMP_AIN1_MSB }, | |
142 | }; | |
143 | ||
144 | val = adt7411_read_10_bit(client, reg[nr].low, reg[nr].high, 0); | |
d84ca5b3 WS |
145 | if (val < 0) |
146 | return val; | |
147 | ||
148 | val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */ | |
149 | ||
150 | return sprintf(buf, "%d\n", val * 250); | |
151 | } | |
152 | ||
153 | static ssize_t adt7411_show_input(struct device *dev, | |
154 | struct device_attribute *attr, char *buf) | |
155 | { | |
156 | int nr = to_sensor_dev_attr(attr)->index; | |
eac83cd9 AL |
157 | struct adt7411_data *data = dev_get_drvdata(dev); |
158 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
159 | int val; |
160 | u8 lsb_reg, lsb_shift; | |
161 | ||
23244985 | 162 | mutex_lock(&data->update_lock); |
d84ca5b3 WS |
163 | if (time_after_eq(jiffies, data->next_update)) { |
164 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3); | |
165 | if (val < 0) | |
23244985 | 166 | goto exit_unlock; |
d84ca5b3 | 167 | |
23244985 | 168 | if (val & ADT7411_CFG3_REF_VDD) { |
d84ca5b3 WS |
169 | val = adt7411_read_10_bit(client, |
170 | ADT7411_REG_INT_TEMP_VDD_LSB, | |
171 | ADT7411_REG_VDD_MSB, 2); | |
172 | if (val < 0) | |
23244985 | 173 | goto exit_unlock; |
d84ca5b3 WS |
174 | |
175 | data->vref_cached = val * 7000 / 1024; | |
176 | } else { | |
177 | data->vref_cached = 2250; | |
178 | } | |
179 | ||
180 | data->next_update = jiffies + HZ; | |
181 | } | |
182 | ||
183 | lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2); | |
184 | lsb_shift = 2 * (nr & 0x03); | |
185 | val = adt7411_read_10_bit(client, lsb_reg, | |
186 | ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift); | |
23244985 WS |
187 | if (val < 0) |
188 | goto exit_unlock; | |
d84ca5b3 | 189 | |
23244985 WS |
190 | val = sprintf(buf, "%u\n", val * data->vref_cached / 1024); |
191 | exit_unlock: | |
192 | mutex_unlock(&data->update_lock); | |
193 | return val; | |
d84ca5b3 WS |
194 | } |
195 | ||
196 | static ssize_t adt7411_show_bit(struct device *dev, | |
197 | struct device_attribute *attr, char *buf) | |
198 | { | |
199 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr); | |
eac83cd9 AL |
200 | struct adt7411_data *data = dev_get_drvdata(dev); |
201 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
202 | int ret = i2c_smbus_read_byte_data(client, attr2->index); |
203 | ||
204 | return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr)); | |
205 | } | |
206 | ||
207 | static ssize_t adt7411_set_bit(struct device *dev, | |
208 | struct device_attribute *attr, const char *buf, | |
209 | size_t count) | |
210 | { | |
211 | struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr); | |
eac83cd9 AL |
212 | struct adt7411_data *data = dev_get_drvdata(dev); |
213 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
214 | int ret; |
215 | unsigned long flag; | |
216 | ||
179c4fdb | 217 | ret = kstrtoul(buf, 0, &flag); |
d84ca5b3 WS |
218 | if (ret || flag > 1) |
219 | return -EINVAL; | |
220 | ||
221 | ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag); | |
222 | ||
223 | /* force update */ | |
23244985 | 224 | mutex_lock(&data->update_lock); |
d84ca5b3 | 225 | data->next_update = jiffies; |
23244985 | 226 | mutex_unlock(&data->update_lock); |
d84ca5b3 WS |
227 | |
228 | return ret < 0 ? ret : count; | |
229 | } | |
230 | ||
a95da110 | 231 | |
d84ca5b3 WS |
232 | #define ADT7411_BIT_ATTR(__name, __reg, __bit) \ |
233 | SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \ | |
234 | adt7411_set_bit, __bit, __reg) | |
235 | ||
a95da110 MW |
236 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL, 0); |
237 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, adt7411_show_temp, NULL, 1); | |
d84ca5b3 WS |
238 | static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL); |
239 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0); | |
240 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1); | |
241 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2); | |
242 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3); | |
243 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4); | |
244 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5); | |
245 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6); | |
246 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7); | |
247 | static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG); | |
248 | static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225); | |
249 | static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD); | |
250 | ||
251 | static struct attribute *adt7411_attrs[] = { | |
a95da110 MW |
252 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
253 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
d84ca5b3 WS |
254 | &dev_attr_in0_input.attr, |
255 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
256 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
257 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
258 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
259 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
260 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
261 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
262 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
263 | &sensor_dev_attr_no_average.dev_attr.attr, | |
264 | &sensor_dev_attr_fast_sampling.dev_attr.attr, | |
265 | &sensor_dev_attr_adc_ref_vdd.dev_attr.attr, | |
266 | NULL | |
267 | }; | |
268 | ||
a95da110 MW |
269 | static umode_t adt7411_attrs_visible(struct kobject *kobj, |
270 | struct attribute *attr, int index) | |
271 | { | |
272 | struct device *dev = container_of(kobj, struct device, kobj); | |
273 | struct adt7411_data *data = dev_get_drvdata(dev); | |
274 | bool visible = true; | |
275 | ||
276 | if (attr == &sensor_dev_attr_temp2_input.dev_attr.attr) | |
277 | visible = data->use_ext_temp; | |
278 | else if (attr == &sensor_dev_attr_in1_input.dev_attr.attr || | |
279 | attr == &sensor_dev_attr_in2_input.dev_attr.attr) | |
280 | visible = !data->use_ext_temp; | |
281 | ||
282 | return visible ? attr->mode : 0; | |
283 | } | |
284 | ||
285 | static const struct attribute_group adt7411_group = { | |
286 | .attrs = adt7411_attrs, | |
287 | .is_visible = adt7411_attrs_visible, | |
288 | }; | |
289 | __ATTRIBUTE_GROUPS(adt7411); | |
d84ca5b3 WS |
290 | |
291 | static int adt7411_detect(struct i2c_client *client, | |
292 | struct i2c_board_info *info) | |
293 | { | |
294 | int val; | |
295 | ||
296 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
297 | return -ENODEV; | |
298 | ||
299 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID); | |
300 | if (val < 0 || val != ADT7411_MANUFACTURER_ID) { | |
b55f3757 GR |
301 | dev_dbg(&client->dev, |
302 | "Wrong manufacturer ID. Got %d, expected %d\n", | |
303 | val, ADT7411_MANUFACTURER_ID); | |
d84ca5b3 WS |
304 | return -ENODEV; |
305 | } | |
306 | ||
307 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID); | |
308 | if (val < 0 || val != ADT7411_DEVICE_ID) { | |
b55f3757 GR |
309 | dev_dbg(&client->dev, |
310 | "Wrong device ID. Got %d, expected %d\n", | |
311 | val, ADT7411_DEVICE_ID); | |
d84ca5b3 WS |
312 | return -ENODEV; |
313 | } | |
314 | ||
315 | strlcpy(info->type, "adt7411", I2C_NAME_SIZE); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
601807bb MW |
320 | static int adt7411_init_device(struct adt7411_data *data) |
321 | { | |
322 | int ret; | |
323 | u8 val; | |
324 | ||
325 | ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3); | |
326 | if (ret < 0) | |
327 | return ret; | |
328 | ||
329 | /* | |
330 | * We must only write zero to bit 1 and bit 2 and only one to bit 3 | |
331 | * according to the datasheet. | |
332 | */ | |
333 | val = ret; | |
334 | val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2); | |
335 | val |= ADT7411_CFG3_RESERVED_BIT3; | |
336 | ||
337 | ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val); | |
338 | if (ret < 0) | |
339 | return ret; | |
340 | ||
341 | ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1); | |
342 | if (ret < 0) | |
343 | return ret; | |
344 | ||
a95da110 MW |
345 | data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM; |
346 | ||
601807bb MW |
347 | /* |
348 | * We must only write zero to bit 1 and only one to bit 3 according to | |
349 | * the datasheet. | |
350 | */ | |
351 | val = ret; | |
352 | val &= ~ADT7411_CFG1_RESERVED_BIT1; | |
353 | val |= ADT7411_CFG1_RESERVED_BIT3; | |
354 | ||
355 | /* enable monitoring */ | |
356 | val |= ADT7411_CFG1_START_MONITOR; | |
357 | ||
358 | return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val); | |
359 | } | |
360 | ||
6c931ae1 | 361 | static int adt7411_probe(struct i2c_client *client, |
d84ca5b3 WS |
362 | const struct i2c_device_id *id) |
363 | { | |
eac83cd9 | 364 | struct device *dev = &client->dev; |
d84ca5b3 | 365 | struct adt7411_data *data; |
eac83cd9 | 366 | struct device *hwmon_dev; |
d84ca5b3 WS |
367 | int ret; |
368 | ||
eac83cd9 | 369 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
d84ca5b3 WS |
370 | if (!data) |
371 | return -ENOMEM; | |
372 | ||
373 | i2c_set_clientdata(client, data); | |
eac83cd9 | 374 | data->client = client; |
d84ca5b3 | 375 | mutex_init(&data->device_lock); |
23244985 | 376 | mutex_init(&data->update_lock); |
d84ca5b3 | 377 | |
601807bb | 378 | ret = adt7411_init_device(data); |
d84ca5b3 | 379 | if (ret < 0) |
65ec17b0 | 380 | return ret; |
d84ca5b3 WS |
381 | |
382 | /* force update on first occasion */ | |
383 | data->next_update = jiffies; | |
384 | ||
eac83cd9 AL |
385 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
386 | data, | |
387 | adt7411_groups); | |
388 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
d84ca5b3 WS |
389 | } |
390 | ||
391 | static const struct i2c_device_id adt7411_id[] = { | |
392 | { "adt7411", 0 }, | |
393 | { } | |
394 | }; | |
a7254d68 | 395 | MODULE_DEVICE_TABLE(i2c, adt7411_id); |
d84ca5b3 WS |
396 | |
397 | static struct i2c_driver adt7411_driver = { | |
398 | .driver = { | |
399 | .name = "adt7411", | |
400 | }, | |
401 | .probe = adt7411_probe, | |
d84ca5b3 WS |
402 | .id_table = adt7411_id, |
403 | .detect = adt7411_detect, | |
404 | .address_list = normal_i2c, | |
405 | .class = I2C_CLASS_HWMON, | |
406 | }; | |
407 | ||
f0967eea | 408 | module_i2c_driver(adt7411_driver); |
d84ca5b3 WS |
409 | |
410 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and " | |
411 | "Wolfram Sang <w.sang@pengutronix.de>"); | |
412 | MODULE_DESCRIPTION("ADT7411 driver"); | |
413 | MODULE_LICENSE("GPL v2"); |