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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 | |
11 | * use power-down mode for suspend?, interrupt handling? | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/jiffies.h> | |
21 | #include <linux/i2c.h> | |
22 | #include <linux/hwmon.h> | |
23 | #include <linux/hwmon-sysfs.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
d84ca5b3 WS |
25 | |
26 | #define ADT7411_REG_INT_TEMP_VDD_LSB 0x03 | |
27 | #define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04 | |
28 | #define ADT7411_REG_VDD_MSB 0x06 | |
29 | #define ADT7411_REG_INT_TEMP_MSB 0x07 | |
30 | #define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08 | |
31 | ||
32 | #define ADT7411_REG_CFG1 0x18 | |
33 | #define ADT7411_CFG1_START_MONITOR (1 << 0) | |
34 | ||
35 | #define ADT7411_REG_CFG2 0x19 | |
36 | #define ADT7411_CFG2_DISABLE_AVG (1 << 5) | |
37 | ||
38 | #define ADT7411_REG_CFG3 0x1a | |
39 | #define ADT7411_CFG3_ADC_CLK_225 (1 << 0) | |
40 | #define ADT7411_CFG3_REF_VDD (1 << 4) | |
41 | ||
42 | #define ADT7411_REG_DEVICE_ID 0x4d | |
43 | #define ADT7411_REG_MANUFACTURER_ID 0x4e | |
44 | ||
45 | #define ADT7411_DEVICE_ID 0x2 | |
46 | #define ADT7411_MANUFACTURER_ID 0x41 | |
47 | ||
48 | static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END }; | |
49 | ||
50 | struct adt7411_data { | |
51 | struct mutex device_lock; /* for "atomic" device accesses */ | |
23244985 | 52 | struct mutex update_lock; |
d84ca5b3 WS |
53 | unsigned long next_update; |
54 | int vref_cached; | |
d84ca5b3 WS |
55 | struct device *hwmon_dev; |
56 | }; | |
57 | ||
58 | /* | |
59 | * When reading a register containing (up to 4) lsb, all associated | |
60 | * msb-registers get locked by the hardware. After _one_ of those msb is read, | |
61 | * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb | |
62 | * is protected here with a mutex, too. | |
63 | */ | |
64 | static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg, | |
65 | u8 msb_reg, u8 lsb_shift) | |
66 | { | |
67 | struct adt7411_data *data = i2c_get_clientdata(client); | |
68 | int val, tmp; | |
69 | ||
70 | mutex_lock(&data->device_lock); | |
71 | ||
72 | val = i2c_smbus_read_byte_data(client, lsb_reg); | |
73 | if (val < 0) | |
74 | goto exit_unlock; | |
75 | ||
76 | tmp = (val >> lsb_shift) & 3; | |
77 | val = i2c_smbus_read_byte_data(client, msb_reg); | |
78 | ||
79 | if (val >= 0) | |
80 | val = (val << 2) | tmp; | |
81 | ||
82 | exit_unlock: | |
83 | mutex_unlock(&data->device_lock); | |
84 | ||
85 | return val; | |
86 | } | |
87 | ||
88 | static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit, | |
89 | bool flag) | |
90 | { | |
91 | struct adt7411_data *data = i2c_get_clientdata(client); | |
92 | int ret, val; | |
93 | ||
94 | mutex_lock(&data->device_lock); | |
95 | ||
96 | ret = i2c_smbus_read_byte_data(client, reg); | |
97 | if (ret < 0) | |
98 | goto exit_unlock; | |
99 | ||
100 | if (flag) | |
101 | val = ret | bit; | |
102 | else | |
103 | val = ret & ~bit; | |
104 | ||
105 | ret = i2c_smbus_write_byte_data(client, reg, val); | |
106 | ||
107 | exit_unlock: | |
108 | mutex_unlock(&data->device_lock); | |
109 | return ret; | |
110 | } | |
111 | ||
112 | static ssize_t adt7411_show_vdd(struct device *dev, | |
113 | struct device_attribute *attr, char *buf) | |
114 | { | |
115 | struct i2c_client *client = to_i2c_client(dev); | |
116 | int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, | |
117 | ADT7411_REG_VDD_MSB, 2); | |
118 | ||
119 | return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024); | |
120 | } | |
121 | ||
122 | static ssize_t adt7411_show_temp(struct device *dev, | |
123 | struct device_attribute *attr, char *buf) | |
124 | { | |
125 | struct i2c_client *client = to_i2c_client(dev); | |
126 | int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, | |
127 | ADT7411_REG_INT_TEMP_MSB, 0); | |
128 | ||
129 | if (val < 0) | |
130 | return val; | |
131 | ||
132 | val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */ | |
133 | ||
134 | return sprintf(buf, "%d\n", val * 250); | |
135 | } | |
136 | ||
137 | static ssize_t adt7411_show_input(struct device *dev, | |
138 | struct device_attribute *attr, char *buf) | |
139 | { | |
140 | int nr = to_sensor_dev_attr(attr)->index; | |
141 | struct i2c_client *client = to_i2c_client(dev); | |
142 | struct adt7411_data *data = i2c_get_clientdata(client); | |
143 | int val; | |
144 | u8 lsb_reg, lsb_shift; | |
145 | ||
23244985 | 146 | mutex_lock(&data->update_lock); |
d84ca5b3 WS |
147 | if (time_after_eq(jiffies, data->next_update)) { |
148 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3); | |
149 | if (val < 0) | |
23244985 | 150 | goto exit_unlock; |
d84ca5b3 | 151 | |
23244985 | 152 | if (val & ADT7411_CFG3_REF_VDD) { |
d84ca5b3 WS |
153 | val = adt7411_read_10_bit(client, |
154 | ADT7411_REG_INT_TEMP_VDD_LSB, | |
155 | ADT7411_REG_VDD_MSB, 2); | |
156 | if (val < 0) | |
23244985 | 157 | goto exit_unlock; |
d84ca5b3 WS |
158 | |
159 | data->vref_cached = val * 7000 / 1024; | |
160 | } else { | |
161 | data->vref_cached = 2250; | |
162 | } | |
163 | ||
164 | data->next_update = jiffies + HZ; | |
165 | } | |
166 | ||
167 | lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2); | |
168 | lsb_shift = 2 * (nr & 0x03); | |
169 | val = adt7411_read_10_bit(client, lsb_reg, | |
170 | ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift); | |
23244985 WS |
171 | if (val < 0) |
172 | goto exit_unlock; | |
d84ca5b3 | 173 | |
23244985 WS |
174 | val = sprintf(buf, "%u\n", val * data->vref_cached / 1024); |
175 | exit_unlock: | |
176 | mutex_unlock(&data->update_lock); | |
177 | return val; | |
d84ca5b3 WS |
178 | } |
179 | ||
180 | static ssize_t adt7411_show_bit(struct device *dev, | |
181 | struct device_attribute *attr, char *buf) | |
182 | { | |
183 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr); | |
184 | struct i2c_client *client = to_i2c_client(dev); | |
185 | int ret = i2c_smbus_read_byte_data(client, attr2->index); | |
186 | ||
187 | return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr)); | |
188 | } | |
189 | ||
190 | static ssize_t adt7411_set_bit(struct device *dev, | |
191 | struct device_attribute *attr, const char *buf, | |
192 | size_t count) | |
193 | { | |
194 | struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr); | |
195 | struct i2c_client *client = to_i2c_client(dev); | |
196 | struct adt7411_data *data = i2c_get_clientdata(client); | |
197 | int ret; | |
198 | unsigned long flag; | |
199 | ||
200 | ret = strict_strtoul(buf, 0, &flag); | |
201 | if (ret || flag > 1) | |
202 | return -EINVAL; | |
203 | ||
204 | ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag); | |
205 | ||
206 | /* force update */ | |
23244985 | 207 | mutex_lock(&data->update_lock); |
d84ca5b3 | 208 | data->next_update = jiffies; |
23244985 | 209 | mutex_unlock(&data->update_lock); |
d84ca5b3 WS |
210 | |
211 | return ret < 0 ? ret : count; | |
212 | } | |
213 | ||
214 | #define ADT7411_BIT_ATTR(__name, __reg, __bit) \ | |
215 | SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \ | |
216 | adt7411_set_bit, __bit, __reg) | |
217 | ||
218 | static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL); | |
219 | static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL); | |
220 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0); | |
221 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1); | |
222 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2); | |
223 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3); | |
224 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4); | |
225 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5); | |
226 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6); | |
227 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7); | |
228 | static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG); | |
229 | static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225); | |
230 | static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD); | |
231 | ||
232 | static struct attribute *adt7411_attrs[] = { | |
233 | &dev_attr_temp1_input.attr, | |
234 | &dev_attr_in0_input.attr, | |
235 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
236 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
237 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
238 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
239 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
240 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
241 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
242 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
243 | &sensor_dev_attr_no_average.dev_attr.attr, | |
244 | &sensor_dev_attr_fast_sampling.dev_attr.attr, | |
245 | &sensor_dev_attr_adc_ref_vdd.dev_attr.attr, | |
246 | NULL | |
247 | }; | |
248 | ||
249 | static const struct attribute_group adt7411_attr_grp = { | |
250 | .attrs = adt7411_attrs, | |
251 | }; | |
252 | ||
253 | static int adt7411_detect(struct i2c_client *client, | |
254 | struct i2c_board_info *info) | |
255 | { | |
256 | int val; | |
257 | ||
258 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
259 | return -ENODEV; | |
260 | ||
261 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID); | |
262 | if (val < 0 || val != ADT7411_MANUFACTURER_ID) { | |
263 | dev_dbg(&client->dev, "Wrong manufacturer ID. Got %d, " | |
264 | "expected %d\n", val, ADT7411_MANUFACTURER_ID); | |
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) { | |
270 | dev_dbg(&client->dev, "Wrong device ID. Got %d, " | |
271 | "expected %d\n", val, ADT7411_DEVICE_ID); | |
272 | return -ENODEV; | |
273 | } | |
274 | ||
275 | strlcpy(info->type, "adt7411", I2C_NAME_SIZE); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int __devinit adt7411_probe(struct i2c_client *client, | |
281 | const struct i2c_device_id *id) | |
282 | { | |
283 | struct adt7411_data *data; | |
284 | int ret; | |
285 | ||
286 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
287 | if (!data) | |
288 | return -ENOMEM; | |
289 | ||
290 | i2c_set_clientdata(client, data); | |
291 | mutex_init(&data->device_lock); | |
23244985 | 292 | mutex_init(&data->update_lock); |
d84ca5b3 WS |
293 | |
294 | ret = adt7411_modify_bit(client, ADT7411_REG_CFG1, | |
295 | ADT7411_CFG1_START_MONITOR, 1); | |
296 | if (ret < 0) | |
297 | goto exit_free; | |
298 | ||
299 | /* force update on first occasion */ | |
300 | data->next_update = jiffies; | |
301 | ||
302 | ret = sysfs_create_group(&client->dev.kobj, &adt7411_attr_grp); | |
303 | if (ret) | |
304 | goto exit_free; | |
305 | ||
306 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
307 | if (IS_ERR(data->hwmon_dev)) { | |
308 | ret = PTR_ERR(data->hwmon_dev); | |
309 | goto exit_remove; | |
310 | } | |
311 | ||
312 | dev_info(&client->dev, "successfully registered\n"); | |
313 | ||
314 | return 0; | |
315 | ||
316 | exit_remove: | |
317 | sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp); | |
318 | exit_free: | |
d84ca5b3 WS |
319 | kfree(data); |
320 | return ret; | |
321 | } | |
322 | ||
323 | static int __devexit adt7411_remove(struct i2c_client *client) | |
324 | { | |
325 | struct adt7411_data *data = i2c_get_clientdata(client); | |
326 | ||
327 | hwmon_device_unregister(data->hwmon_dev); | |
328 | sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp); | |
d84ca5b3 WS |
329 | kfree(data); |
330 | return 0; | |
331 | } | |
332 | ||
333 | static const struct i2c_device_id adt7411_id[] = { | |
334 | { "adt7411", 0 }, | |
335 | { } | |
336 | }; | |
a7254d68 | 337 | MODULE_DEVICE_TABLE(i2c, adt7411_id); |
d84ca5b3 WS |
338 | |
339 | static struct i2c_driver adt7411_driver = { | |
340 | .driver = { | |
341 | .name = "adt7411", | |
342 | }, | |
343 | .probe = adt7411_probe, | |
344 | .remove = __devexit_p(adt7411_remove), | |
345 | .id_table = adt7411_id, | |
346 | .detect = adt7411_detect, | |
347 | .address_list = normal_i2c, | |
348 | .class = I2C_CLASS_HWMON, | |
349 | }; | |
350 | ||
351 | static int __init sensors_adt7411_init(void) | |
352 | { | |
353 | return i2c_add_driver(&adt7411_driver); | |
354 | } | |
355 | module_init(sensors_adt7411_init) | |
356 | ||
357 | static void __exit sensors_adt7411_exit(void) | |
358 | { | |
359 | i2c_del_driver(&adt7411_driver); | |
360 | } | |
361 | module_exit(sensors_adt7411_exit) | |
362 | ||
363 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and " | |
364 | "Wolfram Sang <w.sang@pengutronix.de>"); | |
365 | MODULE_DESCRIPTION("ADT7411 driver"); | |
366 | MODULE_LICENSE("GPL v2"); |