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Diffstat (limited to 'drivers/hwmon/ad7418.c')
-rw-r--r--drivers/hwmon/ad7418.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/hwmon/ad7418.c b/drivers/hwmon/ad7418.c
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+++ b/drivers/hwmon/ad7418.c
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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
24#include "lm75.h"
25
26#define DRV_VERSION "0.3"
27
28/* Addresses to scan */
29static unsigned short normal_i2c[] = { 0x28, I2C_CLIENT_END };
30/* Insmod parameters */
31I2C_CLIENT_INSMOD_3(ad7416, ad7417, ad7418);
32
33/* AD7418 registers */
34#define AD7418_REG_TEMP_IN 0x00
35#define AD7418_REG_CONF 0x01
36#define AD7418_REG_TEMP_HYST 0x02
37#define AD7418_REG_TEMP_OS 0x03
38#define AD7418_REG_ADC 0x04
39#define AD7418_REG_CONF2 0x05
40
41#define AD7418_REG_ADC_CH(x) ((x) << 5)
42#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)
43
44static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
45 AD7418_REG_TEMP_HYST,
46 AD7418_REG_TEMP_OS };
47
48struct ad7418_data {
49 struct i2c_client client;
50 struct class_device *class_dev;
51 struct attribute_group attrs;
52 enum chips type;
53 struct mutex lock;
54 int adc_max; /* number of ADC channels */
55 char valid;
56 unsigned long last_updated; /* In jiffies */
57 s16 temp[3]; /* Register values */
58 u16 in[4];
59};
60
61static int ad7418_attach_adapter(struct i2c_adapter *adapter);
62static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind);
63static int ad7418_detach_client(struct i2c_client *client);
64
65static struct i2c_driver ad7418_driver = {
66 .driver = {
67 .name = "ad7418",
68 },
69 .attach_adapter = ad7418_attach_adapter,
70 .detach_client = ad7418_detach_client,
71};
72
73/* All registers are word-sized, except for the configuration registers.
74 * AD7418 uses a high-byte first convention. Do NOT use those functions to
75 * access the configuration registers CONF and CONF2, as they are byte-sized.
76 */
77static inline int ad7418_read(struct i2c_client *client, u8 reg)
78{
79 return swab16(i2c_smbus_read_word_data(client, reg));
80}
81
82static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value)
83{
84 return i2c_smbus_write_word_data(client, reg, swab16(value));
85}
86
87static void ad7418_init_client(struct i2c_client *client)
88{
89 struct ad7418_data *data = i2c_get_clientdata(client);
90
91 int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
92 if (reg < 0) {
93 dev_err(&client->dev, "cannot read configuration register\n");
94 } else {
95 dev_info(&client->dev, "configuring for mode 1\n");
96 i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
97
98 if (data->type == ad7417 || data->type == ad7418)
99 i2c_smbus_write_byte_data(client,
100 AD7418_REG_CONF2, 0x00);
101 }
102}
103
104static struct ad7418_data *ad7418_update_device(struct device *dev)
105{
106 struct i2c_client *client = to_i2c_client(dev);
107 struct ad7418_data *data = i2c_get_clientdata(client);
108
109 mutex_lock(&data->lock);
110
111 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
112 || !data->valid) {
113 u8 cfg;
114 int i, ch;
115
116 /* read config register and clear channel bits */
117 cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
118 cfg &= 0x1F;
119
120 i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
121 cfg | AD7418_CH_TEMP);
122 udelay(30);
123
124 for (i = 0; i < 3; i++) {
125 data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]);
126 }
127
128 for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
129 i2c_smbus_write_byte_data(client,
130 AD7418_REG_CONF,
131 cfg | AD7418_REG_ADC_CH(ch));
132
133 udelay(15);
134 data->in[data->adc_max - 1 - i] =
135 ad7418_read(client, AD7418_REG_ADC);
136 }
137
138 /* restore old configuration value */
139 ad7418_write(client, AD7418_REG_CONF, cfg);
140
141 data->last_updated = jiffies;
142 data->valid = 1;
143 }
144
145 mutex_unlock(&data->lock);
146
147 return data;
148}
149
150static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
151 char *buf)
152{
153 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
154 struct ad7418_data *data = ad7418_update_device(dev);
155 return sprintf(buf, "%d\n",
156 LM75_TEMP_FROM_REG(data->temp[attr->index]));
157}
158
159static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
160 char *buf)
161{
162 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
163 struct ad7418_data *data = ad7418_update_device(dev);
164
165 return sprintf(buf, "%d\n",
166 ((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
167}
168
169static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
170 const char *buf, size_t count)
171{
172 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
173 struct i2c_client *client = to_i2c_client(dev);
174 struct ad7418_data *data = i2c_get_clientdata(client);
175 int temp = simple_strtol(buf, NULL, 10);
176
177 mutex_lock(&data->lock);
178 data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
179 ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]);
180 mutex_unlock(&data->lock);
181 return count;
182}
183
184static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
185static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
186 show_temp, set_temp, 1);
187static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
188 show_temp, set_temp, 2);
189
190static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
191static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
192static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
193static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
194
195static int ad7418_attach_adapter(struct i2c_adapter *adapter)
196{
197 if (!(adapter->class & I2C_CLASS_HWMON))
198 return 0;
199 return i2c_probe(adapter, &addr_data, ad7418_detect);
200}
201
202static struct attribute *ad7416_attributes[] = {
203 &sensor_dev_attr_temp1_max.dev_attr.attr,
204 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
205 &sensor_dev_attr_temp1_input.dev_attr.attr,
206 NULL
207};
208
209static struct attribute *ad7417_attributes[] = {
210 &sensor_dev_attr_temp1_max.dev_attr.attr,
211 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
212 &sensor_dev_attr_temp1_input.dev_attr.attr,
213 &sensor_dev_attr_in1_input.dev_attr.attr,
214 &sensor_dev_attr_in2_input.dev_attr.attr,
215 &sensor_dev_attr_in3_input.dev_attr.attr,
216 &sensor_dev_attr_in4_input.dev_attr.attr,
217 NULL
218};
219
220static struct attribute *ad7418_attributes[] = {
221 &sensor_dev_attr_temp1_max.dev_attr.attr,
222 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
223 &sensor_dev_attr_temp1_input.dev_attr.attr,
224 &sensor_dev_attr_in1_input.dev_attr.attr,
225 NULL
226};
227
228static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind)
229{
230 struct i2c_client *client;
231 struct ad7418_data *data;
232 int err = 0;
233
234 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
235 I2C_FUNC_SMBUS_WORD_DATA))
236 goto exit;
237
238 if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) {
239 err = -ENOMEM;
240 goto exit;
241 }
242
243 client = &data->client;
244 client->addr = address;
245 client->adapter = adapter;
246 client->driver = &ad7418_driver;
247
248 i2c_set_clientdata(client, data);
249
250 mutex_init(&data->lock);
251
252 /* AD7418 has a curious behaviour on registers 6 and 7. They
253 * both always read 0xC071 and are not documented on the datasheet.
254 * We use them to detect the chip.
255 */
256 if (kind <= 0) {
257 int reg, reg6, reg7;
258
259 /* the AD7416 lies within this address range, but I have
260 * no means to check.
261 */
262 if (address >= 0x48 && address <= 0x4f) {
263 /* XXX add tests for AD7416 here */
264 /* data->type = ad7416; */
265 }
266 /* here we might have AD7417 or AD7418 */
267 else if (address >= 0x28 && address <= 0x2f) {
268 reg6 = i2c_smbus_read_word_data(client, 0x06);
269 reg7 = i2c_smbus_read_word_data(client, 0x07);
270
271 if (address == 0x28 && reg6 == 0xC071 && reg7 == 0xC071)
272 data->type = ad7418;
273
274 /* XXX add tests for AD7417 here */
275
276
277 /* both AD7417 and AD7418 have bits 0-5 of
278 * the CONF2 register at 0
279 */
280 reg = i2c_smbus_read_byte_data(client,
281 AD7418_REG_CONF2);
282 if (reg & 0x3F)
283 data->type = any_chip; /* detection failed */
284 }
285 } else {
286 dev_dbg(&adapter->dev, "detection forced\n");
287 }
288
289 if (kind > 0)
290 data->type = kind;
291 else if (kind < 0 && data->type == any_chip) {
292 err = -ENODEV;
293 goto exit_free;
294 }
295
296 switch (data->type) {
297 case any_chip:
298 case ad7416:
299 data->adc_max = 0;
300 data->attrs.attrs = ad7416_attributes;
301 strlcpy(client->name, "ad7416", I2C_NAME_SIZE);
302 break;
303
304 case ad7417:
305 data->adc_max = 4;
306 data->attrs.attrs = ad7417_attributes;
307 strlcpy(client->name, "ad7417", I2C_NAME_SIZE);
308 break;
309
310 case ad7418:
311 data->adc_max = 1;
312 data->attrs.attrs = ad7418_attributes;
313 strlcpy(client->name, "ad7418", I2C_NAME_SIZE);
314 break;
315 }
316
317 if ((err = i2c_attach_client(client)))
318 goto exit_free;
319
320 dev_info(&client->dev, "%s chip found\n", client->name);
321
322 /* Initialize the AD7418 chip */
323 ad7418_init_client(client);
324
325 /* Register sysfs hooks */
326 if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
327 goto exit_detach;
328
329 data->class_dev = hwmon_device_register(&client->dev);
330 if (IS_ERR(data->class_dev)) {
331 err = PTR_ERR(data->class_dev);
332 goto exit_remove;
333 }
334
335 return 0;
336
337exit_remove:
338 sysfs_remove_group(&client->dev.kobj, &data->attrs);
339exit_detach:
340 i2c_detach_client(client);
341exit_free:
342 kfree(data);
343exit:
344 return err;
345}
346
347static int ad7418_detach_client(struct i2c_client *client)
348{
349 struct ad7418_data *data = i2c_get_clientdata(client);
350 hwmon_device_unregister(data->class_dev);
351 sysfs_remove_group(&client->dev.kobj, &data->attrs);
352 i2c_detach_client(client);
353 kfree(data);
354 return 0;
355}
356
357static int __init ad7418_init(void)
358{
359 return i2c_add_driver(&ad7418_driver);
360}
361
362static void __exit ad7418_exit(void)
363{
364 i2c_del_driver(&ad7418_driver);
365}
366
367MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
368MODULE_DESCRIPTION("AD7416/17/18 driver");
369MODULE_LICENSE("GPL");
370MODULE_VERSION(DRV_VERSION);
371
372module_init(ad7418_init);
373module_exit(ad7418_exit);
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