1
2
3
4
5
6
7
8
9
10
11
12
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#include <linux/slab.h>
24
25#include "lm75.h"
26
27#define DRV_VERSION "0.4"
28
29enum chips { ad7416, ad7417, ad7418 };
30
31
32#define AD7418_REG_TEMP_IN 0x00
33#define AD7418_REG_CONF 0x01
34#define AD7418_REG_TEMP_HYST 0x02
35#define AD7418_REG_TEMP_OS 0x03
36#define AD7418_REG_ADC 0x04
37#define AD7418_REG_CONF2 0x05
38
39#define AD7418_REG_ADC_CH(x) ((x) << 5)
40#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)
41
42static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
43 AD7418_REG_TEMP_HYST,
44 AD7418_REG_TEMP_OS };
45
46struct ad7418_data {
47 struct device *hwmon_dev;
48 struct attribute_group attrs;
49 enum chips type;
50 struct mutex lock;
51 int adc_max;
52 char valid;
53 unsigned long last_updated;
54 s16 temp[3];
55 u16 in[4];
56};
57
58static int ad7418_probe(struct i2c_client *client,
59 const struct i2c_device_id *id);
60static int ad7418_remove(struct i2c_client *client);
61
62static const struct i2c_device_id ad7418_id[] = {
63 { "ad7416", ad7416 },
64 { "ad7417", ad7417 },
65 { "ad7418", ad7418 },
66 { }
67};
68MODULE_DEVICE_TABLE(i2c, ad7418_id);
69
70static struct i2c_driver ad7418_driver = {
71 .driver = {
72 .name = "ad7418",
73 },
74 .probe = ad7418_probe,
75 .remove = ad7418_remove,
76 .id_table = ad7418_id,
77};
78
79static void ad7418_init_client(struct i2c_client *client)
80{
81 struct ad7418_data *data = i2c_get_clientdata(client);
82
83 int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
84 if (reg < 0) {
85 dev_err(&client->dev, "cannot read configuration register\n");
86 } else {
87 dev_info(&client->dev, "configuring for mode 1\n");
88 i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
89
90 if (data->type == ad7417 || data->type == ad7418)
91 i2c_smbus_write_byte_data(client,
92 AD7418_REG_CONF2, 0x00);
93 }
94}
95
96static struct ad7418_data *ad7418_update_device(struct device *dev)
97{
98 struct i2c_client *client = to_i2c_client(dev);
99 struct ad7418_data *data = i2c_get_clientdata(client);
100
101 mutex_lock(&data->lock);
102
103 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
104 || !data->valid) {
105 u8 cfg;
106 int i, ch;
107
108
109 cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
110 cfg &= 0x1F;
111
112 i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
113 cfg | AD7418_CH_TEMP);
114 udelay(30);
115
116 for (i = 0; i < 3; i++) {
117 data->temp[i] =
118 i2c_smbus_read_word_swapped(client,
119 AD7418_REG_TEMP[i]);
120 }
121
122 for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
123 i2c_smbus_write_byte_data(client,
124 AD7418_REG_CONF,
125 cfg | AD7418_REG_ADC_CH(ch));
126
127 udelay(15);
128 data->in[data->adc_max - 1 - i] =
129 i2c_smbus_read_word_swapped(client,
130 AD7418_REG_ADC);
131 }
132
133
134 i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
135
136 data->last_updated = jiffies;
137 data->valid = 1;
138 }
139
140 mutex_unlock(&data->lock);
141
142 return data;
143}
144
145static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
146 char *buf)
147{
148 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
149 struct ad7418_data *data = ad7418_update_device(dev);
150 return sprintf(buf, "%d\n",
151 LM75_TEMP_FROM_REG(data->temp[attr->index]));
152}
153
154static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
155 char *buf)
156{
157 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
158 struct ad7418_data *data = ad7418_update_device(dev);
159
160 return sprintf(buf, "%d\n",
161 ((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
162}
163
164static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
165 const char *buf, size_t count)
166{
167 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
168 struct i2c_client *client = to_i2c_client(dev);
169 struct ad7418_data *data = i2c_get_clientdata(client);
170 long temp = simple_strtol(buf, NULL, 10);
171
172 mutex_lock(&data->lock);
173 data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
174 i2c_smbus_write_word_swapped(client,
175 AD7418_REG_TEMP[attr->index],
176 data->temp[attr->index]);
177 mutex_unlock(&data->lock);
178 return count;
179}
180
181static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
182static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
183 show_temp, set_temp, 1);
184static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
185 show_temp, set_temp, 2);
186
187static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
188static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
189static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
190static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
191
192static struct attribute *ad7416_attributes[] = {
193 &sensor_dev_attr_temp1_max.dev_attr.attr,
194 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
195 &sensor_dev_attr_temp1_input.dev_attr.attr,
196 NULL
197};
198
199static struct attribute *ad7417_attributes[] = {
200 &sensor_dev_attr_temp1_max.dev_attr.attr,
201 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
202 &sensor_dev_attr_temp1_input.dev_attr.attr,
203 &sensor_dev_attr_in1_input.dev_attr.attr,
204 &sensor_dev_attr_in2_input.dev_attr.attr,
205 &sensor_dev_attr_in3_input.dev_attr.attr,
206 &sensor_dev_attr_in4_input.dev_attr.attr,
207 NULL
208};
209
210static struct attribute *ad7418_attributes[] = {
211 &sensor_dev_attr_temp1_max.dev_attr.attr,
212 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
213 &sensor_dev_attr_temp1_input.dev_attr.attr,
214 &sensor_dev_attr_in1_input.dev_attr.attr,
215 NULL
216};
217
218static int ad7418_probe(struct i2c_client *client,
219 const struct i2c_device_id *id)
220{
221 struct i2c_adapter *adapter = client->adapter;
222 struct ad7418_data *data;
223 int err;
224
225 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
226 I2C_FUNC_SMBUS_WORD_DATA)) {
227 err = -EOPNOTSUPP;
228 goto exit;
229 }
230
231 if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) {
232 err = -ENOMEM;
233 goto exit;
234 }
235
236 i2c_set_clientdata(client, data);
237
238 mutex_init(&data->lock);
239 data->type = id->driver_data;
240
241 switch (data->type) {
242 case ad7416:
243 data->adc_max = 0;
244 data->attrs.attrs = ad7416_attributes;
245 break;
246
247 case ad7417:
248 data->adc_max = 4;
249 data->attrs.attrs = ad7417_attributes;
250 break;
251
252 case ad7418:
253 data->adc_max = 1;
254 data->attrs.attrs = ad7418_attributes;
255 break;
256 }
257
258 dev_info(&client->dev, "%s chip found\n", client->name);
259
260
261 ad7418_init_client(client);
262
263
264 if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
265 goto exit_free;
266
267 data->hwmon_dev = hwmon_device_register(&client->dev);
268 if (IS_ERR(data->hwmon_dev)) {
269 err = PTR_ERR(data->hwmon_dev);
270 goto exit_remove;
271 }
272
273 return 0;
274
275exit_remove:
276 sysfs_remove_group(&client->dev.kobj, &data->attrs);
277exit_free:
278 kfree(data);
279exit:
280 return err;
281}
282
283static int ad7418_remove(struct i2c_client *client)
284{
285 struct ad7418_data *data = i2c_get_clientdata(client);
286 hwmon_device_unregister(data->hwmon_dev);
287 sysfs_remove_group(&client->dev.kobj, &data->attrs);
288 kfree(data);
289 return 0;
290}
291
292static int __init ad7418_init(void)
293{
294 return i2c_add_driver(&ad7418_driver);
295}
296
297static void __exit ad7418_exit(void)
298{
299 i2c_del_driver(&ad7418_driver);
300}
301
302MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
303MODULE_DESCRIPTION("AD7416/17/18 driver");
304MODULE_LICENSE("GPL");
305MODULE_VERSION(DRV_VERSION);
306
307module_init(ad7418_init);
308module_exit(ad7418_exit);
309
