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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 | * | |
10 | * TODO: SPI, support for external temperature sensor | |
e6a83dbe | 11 | * use power-down mode for suspend?, interrupt handling? |
d84ca5b3 WS |
12 | */ |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/err.h> | |
d84ca5b3 WS |
18 | #include <linux/mutex.h> |
19 | #include <linux/jiffies.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/hwmon.h> | |
22 | #include <linux/hwmon-sysfs.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
d84ca5b3 WS |
24 | |
25 | #define ADT7411_REG_INT_TEMP_VDD_LSB 0x03 | |
26 | #define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04 | |
27 | #define ADT7411_REG_VDD_MSB 0x06 | |
28 | #define ADT7411_REG_INT_TEMP_MSB 0x07 | |
29 | #define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08 | |
30 | ||
31 | #define ADT7411_REG_CFG1 0x18 | |
32 | #define ADT7411_CFG1_START_MONITOR (1 << 0) | |
33 | ||
34 | #define ADT7411_REG_CFG2 0x19 | |
35 | #define ADT7411_CFG2_DISABLE_AVG (1 << 5) | |
36 | ||
37 | #define ADT7411_REG_CFG3 0x1a | |
38 | #define ADT7411_CFG3_ADC_CLK_225 (1 << 0) | |
39 | #define ADT7411_CFG3_REF_VDD (1 << 4) | |
40 | ||
41 | #define ADT7411_REG_DEVICE_ID 0x4d | |
42 | #define ADT7411_REG_MANUFACTURER_ID 0x4e | |
43 | ||
44 | #define ADT7411_DEVICE_ID 0x2 | |
45 | #define ADT7411_MANUFACTURER_ID 0x41 | |
46 | ||
47 | static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END }; | |
48 | ||
49 | struct adt7411_data { | |
50 | struct mutex device_lock; /* for "atomic" device accesses */ | |
23244985 | 51 | struct mutex update_lock; |
d84ca5b3 WS |
52 | unsigned long next_update; |
53 | int vref_cached; | |
d84ca5b3 WS |
54 | struct device *hwmon_dev; |
55 | }; | |
56 | ||
57 | /* | |
58 | * When reading a register containing (up to 4) lsb, all associated | |
59 | * msb-registers get locked by the hardware. After _one_ of those msb is read, | |
60 | * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb | |
61 | * is protected here with a mutex, too. | |
62 | */ | |
63 | static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg, | |
64 | u8 msb_reg, u8 lsb_shift) | |
65 | { | |
66 | struct adt7411_data *data = i2c_get_clientdata(client); | |
67 | int val, tmp; | |
68 | ||
69 | mutex_lock(&data->device_lock); | |
70 | ||
71 | val = i2c_smbus_read_byte_data(client, lsb_reg); | |
72 | if (val < 0) | |
73 | goto exit_unlock; | |
74 | ||
75 | tmp = (val >> lsb_shift) & 3; | |
76 | val = i2c_smbus_read_byte_data(client, msb_reg); | |
77 | ||
78 | if (val >= 0) | |
79 | val = (val << 2) | tmp; | |
80 | ||
81 | exit_unlock: | |
82 | mutex_unlock(&data->device_lock); | |
83 | ||
84 | return val; | |
85 | } | |
86 | ||
87 | static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit, | |
88 | bool flag) | |
89 | { | |
90 | struct adt7411_data *data = i2c_get_clientdata(client); | |
91 | int ret, val; | |
92 | ||
93 | mutex_lock(&data->device_lock); | |
94 | ||
95 | ret = i2c_smbus_read_byte_data(client, reg); | |
96 | if (ret < 0) | |
97 | goto exit_unlock; | |
98 | ||
99 | if (flag) | |
100 | val = ret | bit; | |
101 | else | |
102 | val = ret & ~bit; | |
103 | ||
104 | ret = i2c_smbus_write_byte_data(client, reg, val); | |
105 | ||
106 | exit_unlock: | |
107 | mutex_unlock(&data->device_lock); | |
108 | return ret; | |
109 | } | |
110 | ||
111 | static ssize_t adt7411_show_vdd(struct device *dev, | |
112 | struct device_attribute *attr, char *buf) | |
113 | { | |
114 | struct i2c_client *client = to_i2c_client(dev); | |
115 | int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, | |
116 | ADT7411_REG_VDD_MSB, 2); | |
117 | ||
118 | return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024); | |
119 | } | |
120 | ||
121 | static ssize_t adt7411_show_temp(struct device *dev, | |
122 | struct device_attribute *attr, char *buf) | |
123 | { | |
124 | struct i2c_client *client = to_i2c_client(dev); | |
125 | int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, | |
126 | ADT7411_REG_INT_TEMP_MSB, 0); | |
127 | ||
128 | if (val < 0) | |
129 | return val; | |
130 | ||
131 | val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */ | |
132 | ||
133 | return sprintf(buf, "%d\n", val * 250); | |
134 | } | |
135 | ||
136 | static ssize_t adt7411_show_input(struct device *dev, | |
137 | struct device_attribute *attr, char *buf) | |
138 | { | |
139 | int nr = to_sensor_dev_attr(attr)->index; | |
140 | struct i2c_client *client = to_i2c_client(dev); | |
141 | struct adt7411_data *data = i2c_get_clientdata(client); | |
142 | int val; | |
143 | u8 lsb_reg, lsb_shift; | |
144 | ||
23244985 | 145 | mutex_lock(&data->update_lock); |
d84ca5b3 WS |
146 | if (time_after_eq(jiffies, data->next_update)) { |
147 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3); | |
148 | if (val < 0) | |
23244985 | 149 | goto exit_unlock; |
d84ca5b3 | 150 | |
23244985 | 151 | if (val & ADT7411_CFG3_REF_VDD) { |
d84ca5b3 WS |
152 | val = adt7411_read_10_bit(client, |
153 | ADT7411_REG_INT_TEMP_VDD_LSB, | |
154 | ADT7411_REG_VDD_MSB, 2); | |
155 | if (val < 0) | |
23244985 | 156 | goto exit_unlock; |
d84ca5b3 WS |
157 | |
158 | data->vref_cached = val * 7000 / 1024; | |
159 | } else { | |
160 | data->vref_cached = 2250; | |
161 | } | |
162 | ||
163 | data->next_update = jiffies + HZ; | |
164 | } | |
165 | ||
166 | lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2); | |
167 | lsb_shift = 2 * (nr & 0x03); | |
168 | val = adt7411_read_10_bit(client, lsb_reg, | |
169 | ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift); | |
23244985 WS |
170 | if (val < 0) |
171 | goto exit_unlock; | |
d84ca5b3 | 172 | |
23244985 WS |
173 | val = sprintf(buf, "%u\n", val * data->vref_cached / 1024); |
174 | exit_unlock: | |
175 | mutex_unlock(&data->update_lock); | |
176 | return val; | |
d84ca5b3 WS |
177 | } |
178 | ||
179 | static ssize_t adt7411_show_bit(struct device *dev, | |
180 | struct device_attribute *attr, char *buf) | |
181 | { | |
182 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr); | |
183 | struct i2c_client *client = to_i2c_client(dev); | |
184 | int ret = i2c_smbus_read_byte_data(client, attr2->index); | |
185 | ||
186 | return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr)); | |
187 | } | |
188 | ||
189 | static ssize_t adt7411_set_bit(struct device *dev, | |
190 | struct device_attribute *attr, const char *buf, | |
191 | size_t count) | |
192 | { | |
193 | struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr); | |
194 | struct i2c_client *client = to_i2c_client(dev); | |
195 | struct adt7411_data *data = i2c_get_clientdata(client); | |
196 | int ret; | |
197 | unsigned long flag; | |
198 | ||
179c4fdb | 199 | ret = kstrtoul(buf, 0, &flag); |
d84ca5b3 WS |
200 | if (ret || flag > 1) |
201 | return -EINVAL; | |
202 | ||
203 | ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag); | |
204 | ||
205 | /* force update */ | |
23244985 | 206 | mutex_lock(&data->update_lock); |
d84ca5b3 | 207 | data->next_update = jiffies; |
23244985 | 208 | mutex_unlock(&data->update_lock); |
d84ca5b3 WS |
209 | |
210 | return ret < 0 ? ret : count; | |
211 | } | |
212 | ||
213 | #define ADT7411_BIT_ATTR(__name, __reg, __bit) \ | |
214 | SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \ | |
215 | adt7411_set_bit, __bit, __reg) | |
216 | ||
217 | static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL); | |
218 | static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL); | |
219 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0); | |
220 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1); | |
221 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2); | |
222 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3); | |
223 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4); | |
224 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5); | |
225 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6); | |
226 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7); | |
227 | static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG); | |
228 | static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225); | |
229 | static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD); | |
230 | ||
231 | static struct attribute *adt7411_attrs[] = { | |
232 | &dev_attr_temp1_input.attr, | |
233 | &dev_attr_in0_input.attr, | |
234 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
235 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
236 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
237 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
238 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
239 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
240 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
241 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
242 | &sensor_dev_attr_no_average.dev_attr.attr, | |
243 | &sensor_dev_attr_fast_sampling.dev_attr.attr, | |
244 | &sensor_dev_attr_adc_ref_vdd.dev_attr.attr, | |
245 | NULL | |
246 | }; | |
247 | ||
248 | static const struct attribute_group adt7411_attr_grp = { | |
249 | .attrs = adt7411_attrs, | |
250 | }; | |
251 | ||
252 | static int adt7411_detect(struct i2c_client *client, | |
253 | struct i2c_board_info *info) | |
254 | { | |
255 | int val; | |
256 | ||
257 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
258 | return -ENODEV; | |
259 | ||
260 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID); | |
261 | if (val < 0 || val != ADT7411_MANUFACTURER_ID) { | |
b55f3757 GR |
262 | dev_dbg(&client->dev, |
263 | "Wrong manufacturer ID. Got %d, expected %d\n", | |
264 | val, ADT7411_MANUFACTURER_ID); | |
d84ca5b3 WS |
265 | return -ENODEV; |
266 | } | |
267 | ||
268 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID); | |
269 | if (val < 0 || val != ADT7411_DEVICE_ID) { | |
b55f3757 GR |
270 | dev_dbg(&client->dev, |
271 | "Wrong device ID. Got %d, expected %d\n", | |
272 | val, ADT7411_DEVICE_ID); | |
d84ca5b3 WS |
273 | return -ENODEV; |
274 | } | |
275 | ||
276 | strlcpy(info->type, "adt7411", I2C_NAME_SIZE); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
6c931ae1 | 281 | static int adt7411_probe(struct i2c_client *client, |
d84ca5b3 WS |
282 | const struct i2c_device_id *id) |
283 | { | |
284 | struct adt7411_data *data; | |
285 | int ret; | |
286 | ||
65ec17b0 | 287 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
d84ca5b3 WS |
288 | if (!data) |
289 | return -ENOMEM; | |
290 | ||
291 | i2c_set_clientdata(client, data); | |
292 | mutex_init(&data->device_lock); | |
23244985 | 293 | mutex_init(&data->update_lock); |
d84ca5b3 WS |
294 | |
295 | ret = adt7411_modify_bit(client, ADT7411_REG_CFG1, | |
296 | ADT7411_CFG1_START_MONITOR, 1); | |
297 | if (ret < 0) | |
65ec17b0 | 298 | return ret; |
d84ca5b3 WS |
299 | |
300 | /* force update on first occasion */ | |
301 | data->next_update = jiffies; | |
302 | ||
303 | ret = sysfs_create_group(&client->dev.kobj, &adt7411_attr_grp); | |
304 | if (ret) | |
65ec17b0 | 305 | return ret; |
d84ca5b3 WS |
306 | |
307 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
308 | if (IS_ERR(data->hwmon_dev)) { | |
309 | ret = PTR_ERR(data->hwmon_dev); | |
310 | goto exit_remove; | |
311 | } | |
312 | ||
313 | dev_info(&client->dev, "successfully registered\n"); | |
314 | ||
315 | return 0; | |
316 | ||
317 | exit_remove: | |
318 | sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp); | |
d84ca5b3 WS |
319 | return ret; |
320 | } | |
321 | ||
281dfd0b | 322 | static int adt7411_remove(struct i2c_client *client) |
d84ca5b3 WS |
323 | { |
324 | struct adt7411_data *data = i2c_get_clientdata(client); | |
325 | ||
326 | hwmon_device_unregister(data->hwmon_dev); | |
327 | sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp); | |
d84ca5b3 WS |
328 | return 0; |
329 | } | |
330 | ||
331 | static const struct i2c_device_id adt7411_id[] = { | |
332 | { "adt7411", 0 }, | |
333 | { } | |
334 | }; | |
a7254d68 | 335 | MODULE_DEVICE_TABLE(i2c, adt7411_id); |
d84ca5b3 WS |
336 | |
337 | static struct i2c_driver adt7411_driver = { | |
338 | .driver = { | |
339 | .name = "adt7411", | |
340 | }, | |
341 | .probe = adt7411_probe, | |
9e5e9b7a | 342 | .remove = adt7411_remove, |
d84ca5b3 WS |
343 | .id_table = adt7411_id, |
344 | .detect = adt7411_detect, | |
345 | .address_list = normal_i2c, | |
346 | .class = I2C_CLASS_HWMON, | |
347 | }; | |
348 | ||
f0967eea | 349 | module_i2c_driver(adt7411_driver); |
d84ca5b3 WS |
350 | |
351 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and " | |
352 | "Wolfram Sang <w.sang@pengutronix.de>"); | |
353 | MODULE_DESCRIPTION("ADT7411 driver"); | |
354 | MODULE_LICENSE("GPL v2"); |