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1 | /* |
2 | * An hwmon driver for the Analog Devices AD7416/17/18 | |
3 | * Copyright (C) 2006-07 Tower Technologies | |
4 | * | |
5 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
6 | * | |
7 | * Based on lm75.c | |
8 | * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License, | |
12 | * as published by the Free Software Foundation - version 2. | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/hwmon.h> | |
19 | #include <linux/hwmon-sysfs.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/delay.h> | |
23 | ||
24 | #include "lm75.h" | |
25 | ||
26 | #define DRV_VERSION "0.3" | |
27 | ||
28 | /* Addresses to scan */ | |
29 | static unsigned short normal_i2c[] = { 0x28, I2C_CLIENT_END }; | |
30 | /* Insmod parameters */ | |
31 | I2C_CLIENT_INSMOD_3(ad7416, ad7417, ad7418); | |
32 | ||
33 | /* AD7418 registers */ | |
34 | #define AD7418_REG_TEMP_IN 0x00 | |
35 | #define AD7418_REG_CONF 0x01 | |
36 | #define AD7418_REG_TEMP_HYST 0x02 | |
37 | #define AD7418_REG_TEMP_OS 0x03 | |
38 | #define AD7418_REG_ADC 0x04 | |
39 | #define AD7418_REG_CONF2 0x05 | |
40 | ||
41 | #define AD7418_REG_ADC_CH(x) ((x) << 5) | |
42 | #define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) | |
43 | ||
44 | static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, | |
45 | AD7418_REG_TEMP_HYST, | |
46 | AD7418_REG_TEMP_OS }; | |
47 | ||
48 | struct ad7418_data { | |
49 | struct i2c_client client; | |
50 | struct class_device *class_dev; | |
51 | struct attribute_group attrs; | |
52 | enum chips type; | |
53 | struct mutex lock; | |
54 | int adc_max; /* number of ADC channels */ | |
55 | char valid; | |
56 | unsigned long last_updated; /* In jiffies */ | |
57 | s16 temp[3]; /* Register values */ | |
58 | u16 in[4]; | |
59 | }; | |
60 | ||
61 | static int ad7418_attach_adapter(struct i2c_adapter *adapter); | |
62 | static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind); | |
63 | static int ad7418_detach_client(struct i2c_client *client); | |
64 | ||
65 | static struct i2c_driver ad7418_driver = { | |
66 | .driver = { | |
67 | .name = "ad7418", | |
68 | }, | |
69 | .attach_adapter = ad7418_attach_adapter, | |
70 | .detach_client = ad7418_detach_client, | |
71 | }; | |
72 | ||
73 | /* All registers are word-sized, except for the configuration registers. | |
74 | * AD7418 uses a high-byte first convention. Do NOT use those functions to | |
75 | * access the configuration registers CONF and CONF2, as they are byte-sized. | |
76 | */ | |
77 | static inline int ad7418_read(struct i2c_client *client, u8 reg) | |
78 | { | |
79 | return swab16(i2c_smbus_read_word_data(client, reg)); | |
80 | } | |
81 | ||
82 | static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value) | |
83 | { | |
84 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
85 | } | |
86 | ||
87 | static void ad7418_init_client(struct i2c_client *client) | |
88 | { | |
89 | struct ad7418_data *data = i2c_get_clientdata(client); | |
90 | ||
91 | int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
92 | if (reg < 0) { | |
93 | dev_err(&client->dev, "cannot read configuration register\n"); | |
94 | } else { | |
95 | dev_info(&client->dev, "configuring for mode 1\n"); | |
96 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); | |
97 | ||
98 | if (data->type == ad7417 || data->type == ad7418) | |
99 | i2c_smbus_write_byte_data(client, | |
100 | AD7418_REG_CONF2, 0x00); | |
101 | } | |
102 | } | |
103 | ||
104 | static struct ad7418_data *ad7418_update_device(struct device *dev) | |
105 | { | |
106 | struct i2c_client *client = to_i2c_client(dev); | |
107 | struct ad7418_data *data = i2c_get_clientdata(client); | |
108 | ||
109 | mutex_lock(&data->lock); | |
110 | ||
111 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
112 | || !data->valid) { | |
113 | u8 cfg; | |
114 | int i, ch; | |
115 | ||
116 | /* read config register and clear channel bits */ | |
117 | cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
118 | cfg &= 0x1F; | |
119 | ||
120 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, | |
121 | cfg | AD7418_CH_TEMP); | |
122 | udelay(30); | |
123 | ||
124 | for (i = 0; i < 3; i++) { | |
125 | data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]); | |
126 | } | |
127 | ||
128 | for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { | |
129 | i2c_smbus_write_byte_data(client, | |
130 | AD7418_REG_CONF, | |
131 | cfg | AD7418_REG_ADC_CH(ch)); | |
132 | ||
133 | udelay(15); | |
134 | data->in[data->adc_max - 1 - i] = | |
135 | ad7418_read(client, AD7418_REG_ADC); | |
136 | } | |
137 | ||
138 | /* restore old configuration value */ | |
139 | ad7418_write(client, AD7418_REG_CONF, cfg); | |
140 | ||
141 | data->last_updated = jiffies; | |
142 | data->valid = 1; | |
143 | } | |
144 | ||
145 | mutex_unlock(&data->lock); | |
146 | ||
147 | return data; | |
148 | } | |
149 | ||
150 | static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, | |
151 | char *buf) | |
152 | { | |
153 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
154 | struct ad7418_data *data = ad7418_update_device(dev); | |
155 | return sprintf(buf, "%d\n", | |
156 | LM75_TEMP_FROM_REG(data->temp[attr->index])); | |
157 | } | |
158 | ||
159 | static ssize_t show_adc(struct device *dev, struct device_attribute *devattr, | |
160 | char *buf) | |
161 | { | |
162 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
163 | struct ad7418_data *data = ad7418_update_device(dev); | |
164 | ||
165 | return sprintf(buf, "%d\n", | |
166 | ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); | |
167 | } | |
168 | ||
169 | static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, | |
170 | const char *buf, size_t count) | |
171 | { | |
172 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
173 | struct i2c_client *client = to_i2c_client(dev); | |
174 | struct ad7418_data *data = i2c_get_clientdata(client); | |
175 | int temp = simple_strtol(buf, NULL, 10); | |
176 | ||
177 | mutex_lock(&data->lock); | |
178 | data->temp[attr->index] = LM75_TEMP_TO_REG(temp); | |
179 | ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]); | |
180 | mutex_unlock(&data->lock); | |
181 | return count; | |
182 | } | |
183 | ||
184 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); | |
185 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, | |
186 | show_temp, set_temp, 1); | |
187 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
188 | show_temp, set_temp, 2); | |
189 | ||
190 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0); | |
191 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1); | |
192 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2); | |
193 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3); | |
194 | ||
195 | static int ad7418_attach_adapter(struct i2c_adapter *adapter) | |
196 | { | |
197 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
198 | return 0; | |
199 | return i2c_probe(adapter, &addr_data, ad7418_detect); | |
200 | } | |
201 | ||
202 | static struct attribute *ad7416_attributes[] = { | |
203 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
204 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
205 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
206 | NULL | |
207 | }; | |
208 | ||
209 | static struct attribute *ad7417_attributes[] = { | |
210 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
211 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
212 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
213 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
214 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
215 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
216 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
217 | NULL | |
218 | }; | |
219 | ||
220 | static struct attribute *ad7418_attributes[] = { | |
221 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
222 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
223 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
224 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
225 | NULL | |
226 | }; | |
227 | ||
228 | static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind) | |
229 | { | |
230 | struct i2c_client *client; | |
231 | struct ad7418_data *data; | |
232 | int err = 0; | |
233 | ||
234 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
235 | I2C_FUNC_SMBUS_WORD_DATA)) | |
236 | goto exit; | |
237 | ||
238 | if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) { | |
239 | err = -ENOMEM; | |
240 | goto exit; | |
241 | } | |
242 | ||
243 | client = &data->client; | |
244 | client->addr = address; | |
245 | client->adapter = adapter; | |
246 | client->driver = &ad7418_driver; | |
247 | ||
248 | i2c_set_clientdata(client, data); | |
249 | ||
250 | mutex_init(&data->lock); | |
251 | ||
252 | /* AD7418 has a curious behaviour on registers 6 and 7. They | |
253 | * both always read 0xC071 and are not documented on the datasheet. | |
254 | * We use them to detect the chip. | |
255 | */ | |
256 | if (kind <= 0) { | |
257 | int reg, reg6, reg7; | |
258 | ||
259 | /* the AD7416 lies within this address range, but I have | |
260 | * no means to check. | |
261 | */ | |
262 | if (address >= 0x48 && address <= 0x4f) { | |
263 | /* XXX add tests for AD7416 here */ | |
264 | /* data->type = ad7416; */ | |
265 | } | |
266 | /* here we might have AD7417 or AD7418 */ | |
267 | else if (address >= 0x28 && address <= 0x2f) { | |
268 | reg6 = i2c_smbus_read_word_data(client, 0x06); | |
269 | reg7 = i2c_smbus_read_word_data(client, 0x07); | |
270 | ||
271 | if (address == 0x28 && reg6 == 0xC071 && reg7 == 0xC071) | |
272 | data->type = ad7418; | |
273 | ||
274 | /* XXX add tests for AD7417 here */ | |
275 | ||
276 | ||
277 | /* both AD7417 and AD7418 have bits 0-5 of | |
278 | * the CONF2 register at 0 | |
279 | */ | |
280 | reg = i2c_smbus_read_byte_data(client, | |
281 | AD7418_REG_CONF2); | |
282 | if (reg & 0x3F) | |
283 | data->type = any_chip; /* detection failed */ | |
284 | } | |
285 | } else { | |
286 | dev_dbg(&adapter->dev, "detection forced\n"); | |
287 | } | |
288 | ||
289 | if (kind > 0) | |
290 | data->type = kind; | |
291 | else if (kind < 0 && data->type == any_chip) { | |
292 | err = -ENODEV; | |
293 | goto exit_free; | |
294 | } | |
295 | ||
296 | switch (data->type) { | |
297 | case any_chip: | |
298 | case ad7416: | |
299 | data->adc_max = 0; | |
300 | data->attrs.attrs = ad7416_attributes; | |
301 | strlcpy(client->name, "ad7416", I2C_NAME_SIZE); | |
302 | break; | |
303 | ||
304 | case ad7417: | |
305 | data->adc_max = 4; | |
306 | data->attrs.attrs = ad7417_attributes; | |
307 | strlcpy(client->name, "ad7417", I2C_NAME_SIZE); | |
308 | break; | |
309 | ||
310 | case ad7418: | |
311 | data->adc_max = 1; | |
312 | data->attrs.attrs = ad7418_attributes; | |
313 | strlcpy(client->name, "ad7418", I2C_NAME_SIZE); | |
314 | break; | |
315 | } | |
316 | ||
317 | if ((err = i2c_attach_client(client))) | |
318 | goto exit_free; | |
319 | ||
320 | dev_info(&client->dev, "%s chip found\n", client->name); | |
321 | ||
322 | /* Initialize the AD7418 chip */ | |
323 | ad7418_init_client(client); | |
324 | ||
325 | /* Register sysfs hooks */ | |
326 | if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs))) | |
327 | goto exit_detach; | |
328 | ||
329 | data->class_dev = hwmon_device_register(&client->dev); | |
330 | if (IS_ERR(data->class_dev)) { | |
331 | err = PTR_ERR(data->class_dev); | |
332 | goto exit_remove; | |
333 | } | |
334 | ||
335 | return 0; | |
336 | ||
337 | exit_remove: | |
338 | sysfs_remove_group(&client->dev.kobj, &data->attrs); | |
339 | exit_detach: | |
340 | i2c_detach_client(client); | |
341 | exit_free: | |
342 | kfree(data); | |
343 | exit: | |
344 | return err; | |
345 | } | |
346 | ||
347 | static int ad7418_detach_client(struct i2c_client *client) | |
348 | { | |
349 | struct ad7418_data *data = i2c_get_clientdata(client); | |
350 | hwmon_device_unregister(data->class_dev); | |
351 | sysfs_remove_group(&client->dev.kobj, &data->attrs); | |
352 | i2c_detach_client(client); | |
353 | kfree(data); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static int __init ad7418_init(void) | |
358 | { | |
359 | return i2c_add_driver(&ad7418_driver); | |
360 | } | |
361 | ||
362 | static void __exit ad7418_exit(void) | |
363 | { | |
364 | i2c_del_driver(&ad7418_driver); | |
365 | } | |
366 | ||
367 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
368 | MODULE_DESCRIPTION("AD7416/17/18 driver"); | |
369 | MODULE_LICENSE("GPL"); | |
370 | MODULE_VERSION(DRV_VERSION); | |
371 | ||
372 | module_init(ad7418_init); | |
373 | module_exit(ad7418_exit); |