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Alessandro Zummo2d8dd652007-05-08 17:22:02 +02001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Alessandro Zummo2d8dd652007-05-08 17:22:02 +020024
25#include "lm75.h"
26
Jean Delvare369932f2008-07-16 19:30:08 +020027#define DRV_VERSION "0.4"
Alessandro Zummo2d8dd652007-05-08 17:22:02 +020028
Jean Delvare369932f2008-07-16 19:30:08 +020029enum chips { ad7416, ad7417, ad7418 };
Alessandro Zummo2d8dd652007-05-08 17:22:02 +020030
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 {
Tony Jones1beeffe2007-08-20 13:46:20 -070047 struct device *hwmon_dev;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +020048 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
Jean Delvare369932f2008-07-16 19:30:08 +020058static 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);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +020069
70static struct i2c_driver ad7418_driver = {
71 .driver = {
72 .name = "ad7418",
73 },
Jean Delvare369932f2008-07-16 19:30:08 +020074 .probe = ad7418_probe,
75 .remove = ad7418_remove,
76 .id_table = ad7418_id,
Alessandro Zummo2d8dd652007-05-08 17:22:02 +020077};
78
Alessandro Zummo2d8dd652007-05-08 17:22:02 +020079static 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++) {
Jean Delvare90f41022011-11-04 12:00:47 +0100117 data->temp[i] =
118 i2c_smbus_read_word_swapped(client,
119 AD7418_REG_TEMP[i]);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200120 }
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] =
Jean Delvare90f41022011-11-04 12:00:47 +0100129 i2c_smbus_read_word_swapped(client,
130 AD7418_REG_ADC);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200131 }
132
133 /* restore old configuration value */
Jean Delvare90f41022011-11-04 12:00:47 +0100134 i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200135
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);
Frans Meulenbroekse91aef222012-01-08 19:34:17 +0100170 long temp;
171 int ret = kstrtol(buf, 10, &temp);
172
173 if (ret < 0)
174 return ret;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200175
176 mutex_lock(&data->lock);
177 data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
Jean Delvare90f41022011-11-04 12:00:47 +0100178 i2c_smbus_write_word_swapped(client,
179 AD7418_REG_TEMP[attr->index],
180 data->temp[attr->index]);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200181 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
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200196static 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
Jean Delvare369932f2008-07-16 19:30:08 +0200222static int ad7418_probe(struct i2c_client *client,
223 const struct i2c_device_id *id)
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200224{
Jean Delvare369932f2008-07-16 19:30:08 +0200225 struct i2c_adapter *adapter = client->adapter;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200226 struct ad7418_data *data;
Jean Delvare369932f2008-07-16 19:30:08 +0200227 int err;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200228
229 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
Guenter Roeckd5282922012-06-02 09:57:58 -0700230 I2C_FUNC_SMBUS_WORD_DATA))
231 return -EOPNOTSUPP;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200232
Guenter Roeckd5282922012-06-02 09:57:58 -0700233 data = devm_kzalloc(&client->dev, sizeof(struct ad7418_data),
234 GFP_KERNEL);
235 if (!data)
236 return -ENOMEM;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200237
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200238 i2c_set_clientdata(client, data);
239
240 mutex_init(&data->lock);
Jean Delvare369932f2008-07-16 19:30:08 +0200241 data->type = id->driver_data;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200242
243 switch (data->type) {
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200244 case ad7416:
245 data->adc_max = 0;
246 data->attrs.attrs = ad7416_attributes;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200247 break;
248
249 case ad7417:
250 data->adc_max = 4;
251 data->attrs.attrs = ad7417_attributes;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200252 break;
253
254 case ad7418:
255 data->adc_max = 1;
256 data->attrs.attrs = ad7418_attributes;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200257 break;
258 }
259
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200260 dev_info(&client->dev, "%s chip found\n", client->name);
261
262 /* Initialize the AD7418 chip */
263 ad7418_init_client(client);
264
265 /* Register sysfs hooks */
Frans Meulenbroekse91aef222012-01-08 19:34:17 +0100266 err = sysfs_create_group(&client->dev.kobj, &data->attrs);
267 if (err)
Guenter Roeckd5282922012-06-02 09:57:58 -0700268 return err;
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200269
Tony Jones1beeffe2007-08-20 13:46:20 -0700270 data->hwmon_dev = hwmon_device_register(&client->dev);
271 if (IS_ERR(data->hwmon_dev)) {
272 err = PTR_ERR(data->hwmon_dev);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200273 goto exit_remove;
274 }
275
276 return 0;
277
278exit_remove:
279 sysfs_remove_group(&client->dev.kobj, &data->attrs);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200280 return err;
281}
282
Jean Delvare369932f2008-07-16 19:30:08 +0200283static int ad7418_remove(struct i2c_client *client)
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200284{
285 struct ad7418_data *data = i2c_get_clientdata(client);
Tony Jones1beeffe2007-08-20 13:46:20 -0700286 hwmon_device_unregister(data->hwmon_dev);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200287 sysfs_remove_group(&client->dev.kobj, &data->attrs);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200288 return 0;
289}
290
Axel Linf0967ee2012-01-20 15:38:18 +0800291module_i2c_driver(ad7418_driver);
Alessandro Zummo2d8dd652007-05-08 17:22:02 +0200292
293MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
294MODULE_DESCRIPTION("AD7416/17/18 driver");
295MODULE_LICENSE("GPL");
296MODULE_VERSION(DRV_VERSION);