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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#include <linux/slab.h>
24
25#include "lm75.h"
26
27#define DRV_VERSION "0.4"
28
29enum chips { ad7416, ad7417, ad7418 };
30
31/* AD7418 registers */
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 i2c_client *client;
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
57static struct ad7418_data *ad7418_update_device(struct device *dev)
58{
59 struct ad7418_data *data = dev_get_drvdata(dev);
60 struct i2c_client *client = data->client;
61
62 mutex_lock(&data->lock);
63
64 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
65 || !data->valid) {
66 u8 cfg;
67 int i, ch;
68
69 /* read config register and clear channel bits */
70 cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
71 cfg &= 0x1F;
72
73 i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
74 cfg | AD7418_CH_TEMP);
75 udelay(30);
76
77 for (i = 0; i < 3; i++) {
78 data->temp[i] =
79 i2c_smbus_read_word_swapped(client,
80 AD7418_REG_TEMP[i]);
81 }
82
83 for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
84 i2c_smbus_write_byte_data(client,
85 AD7418_REG_CONF,
86 cfg | AD7418_REG_ADC_CH(ch));
87
88 udelay(15);
89 data->in[data->adc_max - 1 - i] =
90 i2c_smbus_read_word_swapped(client,
91 AD7418_REG_ADC);
92 }
93
94 /* restore old configuration value */
95 i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
96
97 data->last_updated = jiffies;
98 data->valid = 1;
99 }
100
101 mutex_unlock(&data->lock);
102
103 return data;
104}
105
106static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
107 char *buf)
108{
109 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
110 struct ad7418_data *data = ad7418_update_device(dev);
111 return sprintf(buf, "%d\n",
112 LM75_TEMP_FROM_REG(data->temp[attr->index]));
113}
114
115static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
116 char *buf)
117{
118 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
119 struct ad7418_data *data = ad7418_update_device(dev);
120
121 return sprintf(buf, "%d\n",
122 ((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
123}
124
125static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
126 const char *buf, size_t count)
127{
128 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
129 struct ad7418_data *data = dev_get_drvdata(dev);
130 struct i2c_client *client = data->client;
131 long temp;
132 int ret = kstrtol(buf, 10, &temp);
133
134 if (ret < 0)
135 return ret;
136
137 mutex_lock(&data->lock);
138 data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
139 i2c_smbus_write_word_swapped(client,
140 AD7418_REG_TEMP[attr->index],
141 data->temp[attr->index]);
142 mutex_unlock(&data->lock);
143 return count;
144}
145
146static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
147static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
148 show_temp, set_temp, 1);
149static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
150 show_temp, set_temp, 2);
151
152static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
153static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
154static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
155static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
156
157static struct attribute *ad7416_attrs[] = {
158 &sensor_dev_attr_temp1_max.dev_attr.attr,
159 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
160 &sensor_dev_attr_temp1_input.dev_attr.attr,
161 NULL
162};
163ATTRIBUTE_GROUPS(ad7416);
164
165static struct attribute *ad7417_attrs[] = {
166 &sensor_dev_attr_temp1_max.dev_attr.attr,
167 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
168 &sensor_dev_attr_temp1_input.dev_attr.attr,
169 &sensor_dev_attr_in1_input.dev_attr.attr,
170 &sensor_dev_attr_in2_input.dev_attr.attr,
171 &sensor_dev_attr_in3_input.dev_attr.attr,
172 &sensor_dev_attr_in4_input.dev_attr.attr,
173 NULL
174};
175ATTRIBUTE_GROUPS(ad7417);
176
177static struct attribute *ad7418_attrs[] = {
178 &sensor_dev_attr_temp1_max.dev_attr.attr,
179 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
180 &sensor_dev_attr_temp1_input.dev_attr.attr,
181 &sensor_dev_attr_in1_input.dev_attr.attr,
182 NULL
183};
184ATTRIBUTE_GROUPS(ad7418);
185
186static void ad7418_init_client(struct i2c_client *client)
187{
188 struct ad7418_data *data = i2c_get_clientdata(client);
189
190 int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
191 if (reg < 0) {
192 dev_err(&client->dev, "cannot read configuration register\n");
193 } else {
194 dev_info(&client->dev, "configuring for mode 1\n");
195 i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
196
197 if (data->type == ad7417 || data->type == ad7418)
198 i2c_smbus_write_byte_data(client,
199 AD7418_REG_CONF2, 0x00);
200 }
201}
202
203static int ad7418_probe(struct i2c_client *client,
204 const struct i2c_device_id *id)
205{
206 struct device *dev = &client->dev;
207 struct i2c_adapter *adapter = client->adapter;
208 struct ad7418_data *data;
209 struct device *hwmon_dev;
210 const struct attribute_group **attr_groups = NULL;
211
212 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
213 I2C_FUNC_SMBUS_WORD_DATA))
214 return -EOPNOTSUPP;
215
216 data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL);
217 if (!data)
218 return -ENOMEM;
219
220 i2c_set_clientdata(client, data);
221
222 mutex_init(&data->lock);
223 data->client = client;
224 data->type = id->driver_data;
225
226 switch (data->type) {
227 case ad7416:
228 data->adc_max = 0;
229 attr_groups = ad7416_groups;
230 break;
231
232 case ad7417:
233 data->adc_max = 4;
234 attr_groups = ad7417_groups;
235 break;
236
237 case ad7418:
238 data->adc_max = 1;
239 attr_groups = ad7418_groups;
240 break;
241 }
242
243 dev_info(dev, "%s chip found\n", client->name);
244
245 /* Initialize the AD7418 chip */
246 ad7418_init_client(client);
247
248 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
249 client->name,
250 data, attr_groups);
251 return PTR_ERR_OR_ZERO(hwmon_dev);
252}
253
254static const struct i2c_device_id ad7418_id[] = {
255 { "ad7416", ad7416 },
256 { "ad7417", ad7417 },
257 { "ad7418", ad7418 },
258 { }
259};
260MODULE_DEVICE_TABLE(i2c, ad7418_id);
261
262static struct i2c_driver ad7418_driver = {
263 .driver = {
264 .name = "ad7418",
265 },
266 .probe = ad7418_probe,
267 .id_table = ad7418_id,
268};
269
270module_i2c_driver(ad7418_driver);
271
272MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
273MODULE_DESCRIPTION("AD7416/17/18 driver");
274MODULE_LICENSE("GPL");
275MODULE_VERSION(DRV_VERSION);
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#include <linux/slab.h>
24
25#include "lm75.h"
26
27#define DRV_VERSION "0.4"
28
29enum chips { ad7416, ad7417, ad7418 };
30
31/* AD7418 registers */
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; /* number of ADC channels */
52 char valid;
53 unsigned long last_updated; /* In jiffies */
54 s16 temp[3]; /* Register values */
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 /* read config register and clear channel bits */
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 /* restore old configuration value */
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 err = -EOPNOTSUPP;
232 goto exit;
233 }
234
235 data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL);
236 if (!data) {
237 err = -ENOMEM;
238 goto exit;
239 }
240
241 i2c_set_clientdata(client, data);
242
243 mutex_init(&data->lock);
244 data->type = id->driver_data;
245
246 switch (data->type) {
247 case ad7416:
248 data->adc_max = 0;
249 data->attrs.attrs = ad7416_attributes;
250 break;
251
252 case ad7417:
253 data->adc_max = 4;
254 data->attrs.attrs = ad7417_attributes;
255 break;
256
257 case ad7418:
258 data->adc_max = 1;
259 data->attrs.attrs = ad7418_attributes;
260 break;
261 }
262
263 dev_info(&client->dev, "%s chip found\n", client->name);
264
265 /* Initialize the AD7418 chip */
266 ad7418_init_client(client);
267
268 /* Register sysfs hooks */
269 err = sysfs_create_group(&client->dev.kobj, &data->attrs);
270 if (err)
271 goto exit_free;
272
273 data->hwmon_dev = hwmon_device_register(&client->dev);
274 if (IS_ERR(data->hwmon_dev)) {
275 err = PTR_ERR(data->hwmon_dev);
276 goto exit_remove;
277 }
278
279 return 0;
280
281exit_remove:
282 sysfs_remove_group(&client->dev.kobj, &data->attrs);
283exit_free:
284 kfree(data);
285exit:
286 return err;
287}
288
289static int ad7418_remove(struct i2c_client *client)
290{
291 struct ad7418_data *data = i2c_get_clientdata(client);
292 hwmon_device_unregister(data->hwmon_dev);
293 sysfs_remove_group(&client->dev.kobj, &data->attrs);
294 kfree(data);
295 return 0;
296}
297
298module_i2c_driver(ad7418_driver);
299
300MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
301MODULE_DESCRIPTION("AD7416/17/18 driver");
302MODULE_LICENSE("GPL");
303MODULE_VERSION(DRV_VERSION);