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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;
171 int ret = kstrtol(buf, 10, &temp);
172
173 if (ret < 0)
174 return ret;
175
176 mutex_lock(&data->lock);
177 data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
178 i2c_smbus_write_word_swapped(client,
179 AD7418_REG_TEMP[attr->index],
180 data->temp[attr->index]);
181 mutex_unlock(&data->lock);
182 return count;
183}
184
185static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
186static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
187 show_temp, set_temp, 1);
188static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
189 show_temp, set_temp, 2);
190
191static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
192static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
193static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
194static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
195
196static struct attribute *ad7416_attributes[] = {
197 &sensor_dev_attr_temp1_max.dev_attr.attr,
198 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
199 &sensor_dev_attr_temp1_input.dev_attr.attr,
200 NULL
201};
202
203static struct attribute *ad7417_attributes[] = {
204 &sensor_dev_attr_temp1_max.dev_attr.attr,
205 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
206 &sensor_dev_attr_temp1_input.dev_attr.attr,
207 &sensor_dev_attr_in1_input.dev_attr.attr,
208 &sensor_dev_attr_in2_input.dev_attr.attr,
209 &sensor_dev_attr_in3_input.dev_attr.attr,
210 &sensor_dev_attr_in4_input.dev_attr.attr,
211 NULL
212};
213
214static struct attribute *ad7418_attributes[] = {
215 &sensor_dev_attr_temp1_max.dev_attr.attr,
216 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
217 &sensor_dev_attr_temp1_input.dev_attr.attr,
218 &sensor_dev_attr_in1_input.dev_attr.attr,
219 NULL
220};
221
222static int ad7418_probe(struct i2c_client *client,
223 const struct i2c_device_id *id)
224{
225 struct i2c_adapter *adapter = client->adapter;
226 struct ad7418_data *data;
227 int err;
228
229 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
230 I2C_FUNC_SMBUS_WORD_DATA))
231 return -EOPNOTSUPP;
232
233 data = devm_kzalloc(&client->dev, sizeof(struct ad7418_data),
234 GFP_KERNEL);
235 if (!data)
236 return -ENOMEM;
237
238 i2c_set_clientdata(client, data);
239
240 mutex_init(&data->lock);
241 data->type = id->driver_data;
242
243 switch (data->type) {
244 case ad7416:
245 data->adc_max = 0;
246 data->attrs.attrs = ad7416_attributes;
247 break;
248
249 case ad7417:
250 data->adc_max = 4;
251 data->attrs.attrs = ad7417_attributes;
252 break;
253
254 case ad7418:
255 data->adc_max = 1;
256 data->attrs.attrs = ad7418_attributes;
257 break;
258 }
259
260 dev_info(&client->dev, "%s chip found\n", client->name);
261
262
263 ad7418_init_client(client);
264
265
266 err = sysfs_create_group(&client->dev.kobj, &data->attrs);
267 if (err)
268 return err;
269
270 data->hwmon_dev = hwmon_device_register(&client->dev);
271 if (IS_ERR(data->hwmon_dev)) {
272 err = PTR_ERR(data->hwmon_dev);
273 goto exit_remove;
274 }
275
276 return 0;
277
278exit_remove:
279 sysfs_remove_group(&client->dev.kobj, &data->attrs);
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 return 0;
289}
290
291module_i2c_driver(ad7418_driver);
292
293MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
294MODULE_DESCRIPTION("AD7416/17/18 driver");
295MODULE_LICENSE("GPL");
296MODULE_VERSION(DRV_VERSION);
297
