]>
Commit | Line | Data |
---|---|---|
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 "0.4" | |
27 | ||
28 | enum chips { ad7416, ad7417, ad7418 }; | |
29 | ||
30 | /* AD7418 registers */ | |
31 | #define AD7418_REG_TEMP_IN 0x00 | |
32 | #define AD7418_REG_CONF 0x01 | |
33 | #define AD7418_REG_TEMP_HYST 0x02 | |
34 | #define AD7418_REG_TEMP_OS 0x03 | |
35 | #define AD7418_REG_ADC 0x04 | |
36 | #define AD7418_REG_CONF2 0x05 | |
37 | ||
38 | #define AD7418_REG_ADC_CH(x) ((x) << 5) | |
39 | #define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) | |
40 | ||
41 | static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, | |
42 | AD7418_REG_TEMP_HYST, | |
43 | AD7418_REG_TEMP_OS }; | |
44 | ||
45 | struct ad7418_data { | |
46 | struct device *hwmon_dev; | |
47 | struct attribute_group attrs; | |
48 | enum chips type; | |
49 | struct mutex lock; | |
50 | int adc_max; /* number of ADC channels */ | |
51 | char valid; | |
52 | unsigned long last_updated; /* In jiffies */ | |
53 | s16 temp[3]; /* Register values */ | |
54 | u16 in[4]; | |
55 | }; | |
56 | ||
57 | static int ad7418_probe(struct i2c_client *client, | |
58 | const struct i2c_device_id *id); | |
59 | static int ad7418_remove(struct i2c_client *client); | |
60 | ||
61 | static const struct i2c_device_id ad7418_id[] = { | |
62 | { "ad7416", ad7416 }, | |
63 | { "ad7417", ad7417 }, | |
64 | { "ad7418", ad7418 }, | |
65 | { } | |
66 | }; | |
67 | MODULE_DEVICE_TABLE(i2c, ad7418_id); | |
68 | ||
69 | static struct i2c_driver ad7418_driver = { | |
70 | .driver = { | |
71 | .name = "ad7418", | |
72 | }, | |
73 | .probe = ad7418_probe, | |
74 | .remove = ad7418_remove, | |
75 | .id_table = ad7418_id, | |
76 | }; | |
77 | ||
78 | /* All registers are word-sized, except for the configuration registers. | |
79 | * AD7418 uses a high-byte first convention. Do NOT use those functions to | |
80 | * access the configuration registers CONF and CONF2, as they are byte-sized. | |
81 | */ | |
82 | static inline int ad7418_read(struct i2c_client *client, u8 reg) | |
83 | { | |
84 | return swab16(i2c_smbus_read_word_data(client, reg)); | |
85 | } | |
86 | ||
87 | static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value) | |
88 | { | |
89 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
90 | } | |
91 | ||
92 | static void ad7418_init_client(struct i2c_client *client) | |
93 | { | |
94 | struct ad7418_data *data = i2c_get_clientdata(client); | |
95 | ||
96 | int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
97 | if (reg < 0) { | |
98 | dev_err(&client->dev, "cannot read configuration register\n"); | |
99 | } else { | |
100 | dev_info(&client->dev, "configuring for mode 1\n"); | |
101 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); | |
102 | ||
103 | if (data->type == ad7417 || data->type == ad7418) | |
104 | i2c_smbus_write_byte_data(client, | |
105 | AD7418_REG_CONF2, 0x00); | |
106 | } | |
107 | } | |
108 | ||
109 | static struct ad7418_data *ad7418_update_device(struct device *dev) | |
110 | { | |
111 | struct i2c_client *client = to_i2c_client(dev); | |
112 | struct ad7418_data *data = i2c_get_clientdata(client); | |
113 | ||
114 | mutex_lock(&data->lock); | |
115 | ||
116 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
117 | || !data->valid) { | |
118 | u8 cfg; | |
119 | int i, ch; | |
120 | ||
121 | /* read config register and clear channel bits */ | |
122 | cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
123 | cfg &= 0x1F; | |
124 | ||
125 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, | |
126 | cfg | AD7418_CH_TEMP); | |
127 | udelay(30); | |
128 | ||
129 | for (i = 0; i < 3; i++) { | |
130 | data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]); | |
131 | } | |
132 | ||
133 | for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { | |
134 | i2c_smbus_write_byte_data(client, | |
135 | AD7418_REG_CONF, | |
136 | cfg | AD7418_REG_ADC_CH(ch)); | |
137 | ||
138 | udelay(15); | |
139 | data->in[data->adc_max - 1 - i] = | |
140 | ad7418_read(client, AD7418_REG_ADC); | |
141 | } | |
142 | ||
143 | /* restore old configuration value */ | |
144 | ad7418_write(client, AD7418_REG_CONF, cfg); | |
145 | ||
146 | data->last_updated = jiffies; | |
147 | data->valid = 1; | |
148 | } | |
149 | ||
150 | mutex_unlock(&data->lock); | |
151 | ||
152 | return data; | |
153 | } | |
154 | ||
155 | static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, | |
156 | char *buf) | |
157 | { | |
158 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
159 | struct ad7418_data *data = ad7418_update_device(dev); | |
160 | return sprintf(buf, "%d\n", | |
161 | LM75_TEMP_FROM_REG(data->temp[attr->index])); | |
162 | } | |
163 | ||
164 | static ssize_t show_adc(struct device *dev, struct device_attribute *devattr, | |
165 | char *buf) | |
166 | { | |
167 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
168 | struct ad7418_data *data = ad7418_update_device(dev); | |
169 | ||
170 | return sprintf(buf, "%d\n", | |
171 | ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); | |
172 | } | |
173 | ||
174 | static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, | |
175 | const char *buf, size_t count) | |
176 | { | |
177 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
178 | struct i2c_client *client = to_i2c_client(dev); | |
179 | struct ad7418_data *data = i2c_get_clientdata(client); | |
180 | long temp = simple_strtol(buf, NULL, 10); | |
181 | ||
182 | mutex_lock(&data->lock); | |
183 | data->temp[attr->index] = LM75_TEMP_TO_REG(temp); | |
184 | ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]); | |
185 | mutex_unlock(&data->lock); | |
186 | return count; | |
187 | } | |
188 | ||
189 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); | |
190 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, | |
191 | show_temp, set_temp, 1); | |
192 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
193 | show_temp, set_temp, 2); | |
194 | ||
195 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0); | |
196 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1); | |
197 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2); | |
198 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3); | |
199 | ||
200 | static struct attribute *ad7416_attributes[] = { | |
201 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
202 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
203 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
204 | NULL | |
205 | }; | |
206 | ||
207 | static struct attribute *ad7417_attributes[] = { | |
208 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
209 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
210 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
211 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
212 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
213 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
214 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
215 | NULL | |
216 | }; | |
217 | ||
218 | static struct attribute *ad7418_attributes[] = { | |
219 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
220 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
221 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
222 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
223 | NULL | |
224 | }; | |
225 | ||
226 | static int ad7418_probe(struct i2c_client *client, | |
227 | const struct i2c_device_id *id) | |
228 | { | |
229 | struct i2c_adapter *adapter = client->adapter; | |
230 | struct ad7418_data *data; | |
231 | int err; | |
232 | ||
233 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
234 | I2C_FUNC_SMBUS_WORD_DATA)) { | |
235 | err = -EOPNOTSUPP; | |
236 | goto exit; | |
237 | } | |
238 | ||
239 | if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) { | |
240 | err = -ENOMEM; | |
241 | goto exit; | |
242 | } | |
243 | ||
244 | i2c_set_clientdata(client, data); | |
245 | ||
246 | mutex_init(&data->lock); | |
247 | data->type = id->driver_data; | |
248 | ||
249 | switch (data->type) { | |
250 | case ad7416: | |
251 | data->adc_max = 0; | |
252 | data->attrs.attrs = ad7416_attributes; | |
253 | break; | |
254 | ||
255 | case ad7417: | |
256 | data->adc_max = 4; | |
257 | data->attrs.attrs = ad7417_attributes; | |
258 | break; | |
259 | ||
260 | case ad7418: | |
261 | data->adc_max = 1; | |
262 | data->attrs.attrs = ad7418_attributes; | |
263 | break; | |
264 | } | |
265 | ||
266 | dev_info(&client->dev, "%s chip found\n", client->name); | |
267 | ||
268 | /* Initialize the AD7418 chip */ | |
269 | ad7418_init_client(client); | |
270 | ||
271 | /* Register sysfs hooks */ | |
272 | if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs))) | |
273 | goto exit_free; | |
274 | ||
275 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
276 | if (IS_ERR(data->hwmon_dev)) { | |
277 | err = PTR_ERR(data->hwmon_dev); | |
278 | goto exit_remove; | |
279 | } | |
280 | ||
281 | return 0; | |
282 | ||
283 | exit_remove: | |
284 | sysfs_remove_group(&client->dev.kobj, &data->attrs); | |
285 | exit_free: | |
286 | kfree(data); | |
287 | exit: | |
288 | return err; | |
289 | } | |
290 | ||
291 | static int ad7418_remove(struct i2c_client *client) | |
292 | { | |
293 | struct ad7418_data *data = i2c_get_clientdata(client); | |
294 | hwmon_device_unregister(data->hwmon_dev); | |
295 | sysfs_remove_group(&client->dev.kobj, &data->attrs); | |
296 | kfree(data); | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int __init ad7418_init(void) | |
301 | { | |
302 | return i2c_add_driver(&ad7418_driver); | |
303 | } | |
304 | ||
305 | static void __exit ad7418_exit(void) | |
306 | { | |
307 | i2c_del_driver(&ad7418_driver); | |
308 | } | |
309 | ||
310 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
311 | MODULE_DESCRIPTION("AD7416/17/18 driver"); | |
312 | MODULE_LICENSE("GPL"); | |
313 | MODULE_VERSION(DRV_VERSION); | |
314 | ||
315 | module_init(ad7418_init); | |
316 | module_exit(ad7418_exit); |